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A simple monitoring method for observing slope movement and deformation can be performed with tilt sensors. A more efficient monitoring method, using a type of wireless communication called LPWA (low-power wide area) network technology, has also recently become available. In the present study, a monitoring system was developed that combines tilt sensors and LPWA network technology for measuring the movement of slopes and sending the information through wireless communication. First, radio wave propagation experiments were conducted to find the proper location for the gateway device of the monitoring system. Then, in March 2018, the developed system that consists of tilt and water-level sensors and the wireless communication of LPWA was installed at an observation site. Since the installation, the data from the tilt sensors have been successfully collected through LPWA, and a slope failure was unexpectedly observed at the observation site during the Heavy Rain Event of July 2018, which caused severe disasters, particularly from western Japan to the Tokai region. Using the data from the tilt sensors, the rainfall data, and the groundwater level, the slope failure was analysed. A site investigation was conducted, and the shear strength parameter was examined using back analysis method. In conclusion, the developed system using sensors and LPWA has continued to efficiently monitor the movement of the targeted slope, but the collection of additional data will be required to increase the reliability of the system.

DOI： 10.1007/s13349-021-00494-9

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

In recent years, mobile cranes have been larger, and enhancements of various safety devices and assist functions have also been demanded. The author has been proposing to use a hoist rope to equip the assist devices on a hook and to communicate with a device at the boom tip. Although it was reported that the hoist rope was suitable to perform high speed communication of 70Mbps using HD-PLC modems, the means to supply power to the modem equipped on the hook has been unresolved. In this paper, a simultaneous transmission method of power and information through the hoist rope has been proposed. Considering the EMC regulation, it is proposed to use two bands of from 1 to 10 kHz for power transmission and 150kHz or more for information transmission by G3-PLC. A channel modeling method for these bands was studied, and it has been concluded that the transfer functions were in good agreement with the measurement results. When the loop length of the hoist rope was 29.4m and 91.6m, the power transmission efficiency was 0.35 and 0.15, respectively. These values were promising as a result of the first step. It has also been confirmed that even if the G3-PLC modems shared a signal coupler for power transmission, both systems did not interfere with each other.

DOI： 10.1109/ISPLC.2019.8693377

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Other Link： https://dblp.uni-trier.de/db/conf/isplc/isplc2019.html#Tsuzuki19

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DOI： 10.2208/jscejhe.73.I_475

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In recent years, mobile cranes have been larger, and enhancements of various safety devices and assist functions have also been demanded. In this paper, a hoist-rope channel of mobile crane has been explored as a new area for PLC application to achieve a highspeed communication between boom-tip and hook. The channel is a loop circuit formed by a rope and two sheaves, and its simple channel model based on the transmission line theory has been proposed. Although the primary line constant R of the rope has to be derived from the channel impedance measurements from 1M to 50MHz, other constants L and C are given from the well-known formulas, which need only information on the diameter d and distance D of the rope. It has been confirmed that the transfer function calculated from this channel model agreed with the measured values well, where the signal was injected and received through ferrite transformers for a contactless coupling. The throughput of 70Mbps using the transformers was achieved for a truck-mounted crane. It has been also proposed to use the kHz band in combination with the MHz band to deliver the electrical power from the boom-tip to the hook, because the channel impedance of the kHz band is lower. According to our scenario, the signal attenuation at the kHz band was less than that at the MHz band about 16 dB at the maximum.

DOI： 10.1109/ISPLC.2017.7897100

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In recent years, mobile cranes have been larger, and enhancements of various safety devices and assist functions have also been demanded. In this paper, an over-winding detection circuit, which has been used commonly in hydraulic cranes, has been proposed to used as a PLC channel to realize a high speed network infrastructure between cab and boom-tip. The throughput performances of two types of cranes, truck-mounted crane and rough terrain crane, were measured by using HDPLC adapters. It was shown that the best throughput value of 70Mbps was achieved when the proposing system of voltage-drive at the cab and current-reception at the tip was used. From the viewpoint of the transfer function and line impedance properties, the measured throughput performances have been evaluated.

DOI： 10.1109/ISPLC.2016.7476264

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Estimation of global solar radiation from photovoltaic generation was examined using a dataset of pyranometer and solar panel. The solar panel was equipped horizontally and then tilted at an angle of 20o. In the case of horizontally equipped solar panel, the photovoltaic generation was proportional to global solar radiation and once a calibration parameter was attained using one day in one season, solar radiation estimated from photovoltaic generation using the parameter highly agreed with measured data in other days with correlation more than 0.99. The good performance was not only fair weather days but also for other cloudy days. But the calibration parameter was not universal over other seasons. This is probably due to the difference of solar elevation and/or shade effect. In the case of tilted solar panel, the simple conversion resulted in worse and it was demonstrated that the conversion using direct/scatter separation improved the estimation where the correlation is 0.99. The estimation provided in this study is promising for monitoring of spatial and temporal variation of short wave radiation, because solar panel has been already equipped to a lot of houses and commercial, industrial, and public buildings and the generation data can be easily online-based available.

DOI： 10.2208/jscejhe.71.I_421

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Simple and low-cost PLC will be required to play a role in the Internet-of-Things (IoT) market such as ubiquitous wireless sensor networks. From the viewpoints of temporal connectivity and obtaining high SNR and stable channels, inductive coupling techniques for the kHz band PLC have been proposed in this paper. The results of three feasibility studies using a photovoltaic power system installed in our laboratory have been described. First, an inductive coupler is applied to the DC power-line channel, because it forms a low impedance loop circuit. It was proved that the DC power-line provided a high SNR channel, so that the simple modulation technique was enough to realize the ubiquitous PLC networks. The second topic is the contactless power supply using the same ferrite core as the PLC coupler. It has been shown that the proposed circuit could supply power of 35mW at the maximum to a wireless sensor node. The third topic is an application of the 1-wire PLC system to aerial cables. A suitable coupling method has been proposed to provide a low signal attenuation channel. The noise characteristic peculiar to photovoltaic (PV) power-line is also pointed out, that is the amount of noise on a sunny day with cloud occasionally exceeded that on a cloudless sunny day.

DOI： 10.1109/ISPLC.2015.7147627

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The conventional narrowband power-line communication (NB-PLC) is a two-wire system, that has injected its signal between wires using a capacitive coupler. When communicating between floors at a large-sized building, the signal has to travel over long-distances across a switchboard which supplies electricity to distribution boards. Moreover, the signal is attenuated not only at the switchboard but also at the distribution boards. Therefore signal amplifiers had to be installed at the boards. In this paper, a single wire PLC solution is proposed to shorten the communication distance and reduce the attenuation by taking a shortcut of the signal traveling path. It is described experimentally that the earth could be used as its signal returning path to the signal source. Therefore a single wire is enough to inject and receive the signal. An inductive coupling method suitable to this system is also proposed. The signal attenuation of the proposed system was 30dB better than that of the conventional two-wire system for our university building. The achieved performances of PLC modems also showed that the proposed system was useful.

DOI： 10.1109/ISPLC.2014.6812331

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A new signal transmission system for Narrow-Band Power-Line Communications (NB-PLC) has been proposed as an alternative to the conventional system in order to solve the signal propagation loss problem. The conventional transmission system uses the Neutral and Live (N-L) conductors, while the N-PE system uses the Protective Earth (N-PE) conductor instead of L. The channel properties and Packet Reception success Rate (PRR) measured in a house, a laboratory, an office building, and a lecture building in Japan have been shown in this paper. These results showed that the propagation loss and the PRR performances of the proposed system were superior to those of the N-L system, except for the noise property.

DOI： 10.1109/ISPLC.2013.6525843

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan  

The interference with existing radio broadcasting services because of unintentional radiation is a serious problem in power-line communication (PLC) systems. A radiation detection method based on burst packets, which had been proposed by the authors and was called scan and sum (SAS) method, was a low cost method and used to solve the problem. But its measurement took a long time and the burst packets occupied a channel. To shorten the measurement time, a new method based on periodic packets has been proposed in this paper, which is called periodic packet sound (PPS) method. Although both methods record the radiated signal as a sound data, the PPS does not need to scan the frequency of an AM radio receiver but analyses the sound data by a cross-correlation operation with a reference signal. First, how to generate the reference signal that depends on the modems is described. Second, an optimization of the packet size is studied, and finally it is shown that the detection sensitivity of PPS was maintained to be the same as SAS while the measurement time of PPS was 1/9 shorter than that of SAS. Moreover, the channel occupation of PPS was reduced to be 2% of SAS when the packet size was optimized to be 1500 bytes. © 2013 The Institute of Electrical Engineers of Japan.

DOI： 10.1541/ieejeiss.133.2184

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In this paper, a new signal transmission system for Narrow-Band Power-Line Communications (NB-PLC) has been proposed in order to solve problems of the conventional systems. The serious signal propagation loss was the problem for the differential-mode transmission system, which used the live and neutral conductors. Malfunction of the earth leakage circuit breaker was the problem for the common-mode system, which used the live, neutral and protective earth conductors. The proposing system injects and receives the signal between the Neutral and Protective Earth (N-PE) conductors. In order to compare the proposing N-PE transmission system with the differential-mode system, Packet Error Rate (PER) performances of 144 pairs of wall outlets for AC100V, which consisted of 78 in-phase pairs and 66 out-of-phase pairs, in the authors' laboratory were measured. Although the 40% outlet pairs could not communicate at all for the differential-mode system, the ratio was reduced to 4% for the proposed system. Moreover, the communication quality of the PER value being less than or equal to 0.5 was improved 1.7 times more than that of the differential-mode system.

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Other Link： http://dblp.uni-trier.de/db/conf/isita/isita2012.html#conf/isita/TsuzukiYAY12

Language：English   Publisher：The Institute of Electronics, Information and Communication Engineers  

One of the serious problems in the conventional transmission system, which uses the Neutral and Live (N-L) conductors, for the Narrow-Band Power-Line Communications (NB-PLC) is the low Signal to Noise Ratio (SNR) property. To improve it, a new signal transmission system, which uses the Protective Earth (N-PE) conductor instead of L, has been proposed in this letter. The proposed method is called N-PE system. The results show that the receiving SNR, the channel capacity, and the Packet Reception success Rate (PRR) values of the N-PE system were superior to those of the N-L system, except for the noise property.

DOI： 10.1587/comex.1.257

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AEE-PLC (Adaptive power control method to Electromagnetic Environment for the Power-Line Communication) system was proposed by the authors to achieve the maximum throughput performance without radiation. As its radiation detection method, two methods were also proposed. One was called Scan and Sum (SAS) method which detected the radiation of burst packets. Another was Periodic Packet Sound (PPS) method which did it of ICMP (Internet Control Message Protocol) packets generated by the PING (Packet Internet Groper) command. When the throughput performance was measured for the SAS method, the received number of the burst packets was used. For the PPS method, extra burst packets were needed. To avoid them, ICMP packets generated by the utility software of Pchar (Path Characteristics) has been introduced in this paper. The relationship between the size of ICMP packets and the detection sensitivity has been also studied to optimize the size. The result has been confirmed that 1500 Bytes was the optimum size which achieved the high sensitivity with the low channel occupation. © 2012 IEEE.

DOI： 10.1109/ISPLC.2012.6201313

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To realize an eco-house, a new direct current (DC) distribution system has received widespread attention. This paper has proposed countermeasures to fundamental problems which make difficult to achieve a high-speed PLC over the existing alternating current (AC) systems. To reduce the signal attenuation of the conventional low-voltage (LV) power-line cables made from vinyl insulator, it is recommended to use cables made from polyethylene insulator. It has been also recommended not to use the single pole and 3-way switches supposed to be cut into the hot conductor, and hand-made joint boxes in order to make the electrical balance of the channel high. To prove these proposals, a DC power-line system of 1.5kW capacity was built and the throughput was measured. The proposed simultaneous dual-mode system performed 1.9 times better throughput at maximum comparing with the conventional single-mode system. From these observations, a scenario for a 1Gbps Personal Area Network (PAN) over the new DC power-line channels is proposed. © 2012 IEEE.

DOI： 10.1109/ISPLC.2012.6201334

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To improve the throughput performance of HF-PLC systems, a dual-mode transmission system, which utilizes the mode diversity of differential and common modes, has been studied by the authors. However, the system which uses the common-mode has a risk to cause the unintentional radiation problem. To solve the problem, an Adaptive power control method to the Electromagnetic Environment, which is called AEE, has been proposed. The radiation detection was achieved by receiving emitted PLC signals at affected (or concerned) devices. In this paper, a new detection method and a new mode-selection method have been proposed, and it is shown that their preliminary results are attractive from the viewpoint of usefulness. © 2011 IEEE.

DOI： 10.1109/ISPLC.2011.5764416

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A radiation detection method based on burst packets, which was proposed by the authors and is called Scan and Sum (SAS) method, needed so long time, because frequency scanning and power summation were required. To solve the problem, a new method based on ICMP packets has been proposed in this paper, which is called Periodic Packet Sound (PPS) method. The PPS method doesn't scan but record the packets' signal sound for a while at a frequency band. From the recorded sound data, ICMP packets data are picked up using their periodicity and their signal power is calculated. In this paper, both methods have been examined in the hallway of authors' laboratory. To investigate the sensitivity of both methods, the distance between a radiation point and an antenna was changed. Detection limitation distance of the proposed PPS method was the same as that of SAS, while the measurement time was shorten from 90 seconds to 10 seconds. © 2011 IEEE.

DOI： 10.1109/ISPLC.2011.5764436

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan  

Power-line communication (PLC) based local area network (LAN) in cargo ships is one of the promising applications of the PLC technology. In this paper, the signal attenuation characteristic when transmitting with the differential-mode (DIF) and the common-mode (COM) has been modeled respectively to design the PLC network in a cargo ship. The characteristic has been analyzed from the measured transfer function of 440 V power-line channels for reefer containers in two typical ships. The measured transfer function was averaged from 2 M to 30 MHz (or until the measurement limit frequency) and approximated by the number of branches and the length of a signal propagating route. The mean accuracy of the obtained approximation equations was ±4dB. The area where the signal attenuation of COM transmission is less than that of DIF transmission has been studied from the equations. © 2010 The Institute of Electrical Engineers of Japan.

DOI： 10.1541/ieejeiss.130.1337

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A dual-mode transmission system which utilizes the differential and common modes has been proposed. To improve the channel capacity, a simple diversity, which selected the better transmission mode at a client PC side, was examined at laboratory rooms in a building. It was found that the amount of throughput improvement was 45% compared with the conventional single mode transmission of differential-mode. To overcome the unintentional radiation problem caused by the common-mode transmission, an EMC considered algorithm referred to as a power control algorithm which was adaptive to the electromagnetic environment (AEE) was applied to the proposed system. It has been concluded that relatively small areas such as in a house, an office floor in a building and so on, would be the suitable place of the proposed system. ©2010 IEEE.

DOI： 10.1109/ISPLC.2010.5479931

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Institute of Electrical Engineers of Japan  

Power-line communication (PLC) based local area network (LAN) in cargo ships is one of the promising applications of the PLC technology. In this paper, the signal attenuation characteristic when transmitting with the differential-mode (DIF) and the common-mode (COM) has been modeled respectively to design the PLC network in a cargo ship. The characteristic has been analyzed from the measured transfer function of 440 V power-line channels for reefer containers in two typical ships. The measured transfer function was averaged from 2 M to 30 MHz (or until the measurement limit frequency) and approximated by the number of branches and the length of a signal propagating route. The mean accuracy of the obtained approximation equations was ±4dB. The area where the signal attenuation of COM transmission is less than that of DIF transmission has been studied from the equations. © 2010 The Institute of Electrical Engineers of Japan.

DOI： 10.1541/ieejeiss.130.1337

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Control and monitoring is a promising application of power-line communications (PLC) in cargo-carrying ships. The container ship studied in this paper is a type of cargo-carrying ships. The reefer containers on the container ship have been monitored by using PLC over the three-phase 440V line. Since not only reefer containers but also a lot of equipment are connected to the three-phase 440V electric power-line, the obtained speed and quality of the PLC system have been so poor that improvement had been required. To improve the performance, the introduction of the wideband PLC technology is considered in this paper because the conventional PLC system is based on the narrowband PLC technology. There are few reports which describe the channel characteristics of cargo-carrying ships. Although the authors had been measuring the characteristics of 100V lines in the ships since 2007, the characteristics of 440V lines had not measured as yet. In this paper, the measurement results of the transmission characteristics in three-phase 440V electric power-lines of the container ships are explained and modeled. Two transmission modes, differential and common, were examined in the measurement. The results show that it will be possible to perform stable and high -speed PLC systems over long distances using the 3 phase 440V power-line of cargo ships if the differential transmission mode will be used.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

Power-Line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. However, the unintentional-radiation is the serious problem for ship applications because the PLC system must coexist with the emergency communication system and shortwave broadcasting services. In this paper, a power control method of PLC modems depending on the radiation strength is proposed and examined in a training ship. It is proposed to use an antenna for shortwave radios and a wideband receiver (WBR) to measure the radiation strength. It is shown that the sensitivity of the WBR is 17dB better than that of a spectrum analyzer. And by using the antenna, the WBR can be set up at any cabin in ship to measure the radiation strength. The proposed power-control algorithm consists of two modes, silent and power-control modes. After the environmental noise level is measured in the silent mode, the power level of PLC modems which cause the radiation is lowered to be the same level as the environmental noise level. If modems do not cause the radiation, their power level is raised as much as possible to guarantee the maximum possible throughput under the EMC regulation. By executing the silent mode occasionally, the controlled power level is adapted to the environmental noise level.

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DOI： 10.1093/ietfec/e89-a.11.3006

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The authors have proposed a beacon signal radiation system from the power-line for time synchronization among wireless and wired nodes. The considered application of the radiation system is an indoor fine-grained localization. Our rangefinder uses Direct-Sequence Code Division Multiplexed (DS-CDM) audible sound signals. This technique significantly improves performance in obstructed and noisy environments because of the spreading gain. In this paper, it is shown that the obtained average and worst accuracy of the localization in a 4m(2) plane is 1cm and 4cm, respectively, if there is no obstacle. Even if there are obstacles, the proposing method is possible to measure the location by the diffracted sound wave. If the obstacle is relatively small, its accuracy is within 5cm. On the other hand, if the obstacle is relatively large, a method to determine the presence of the large obstacle is proposed. These results are shown experimentally.

DOI： 10.1109/GLOCOM.2006.499

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

A new type of stochastic modeling instead of the HMM for speech recognition, named as bi-gram constraint segment-based speech modeling (BSSM) that uses the correlation between two successive VQ codewords is presented. The main trait of this proposed approach is that the model dose not employ the concept of states as in HMM, but that of segments, corresponding to the quasi-stationary elements in speech. Since the segmentation can easily be performed apart from the function of both the training and the testing processors, the model parameters of BSSM can be estimated without any iterative task which has to be unavoidably followed in the case of HMM-based approach. Through experiments for the speaker independent Japanese mono-syllables recognition, our approach shows its outperformance over the HMM-based approaches viz. bi-gram constraint HMM and temporal correlative HMM. Moreover we have succeeded to reduce tremendously the complexities on both computation and storage compared with the HMM-based approaches.

DOI： 10.11485/itetr.21.51.0_23

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In this paper, we clarify the properties of thirty FM family codes through analyses of their coding rules. We then investigate combinations of these codes with several PRML techniques by simulating bit error rates. The results show that nine FM family codes yield a better SNR than does the conventional FM code at the bit error rate of 10−4. © 1993, IEEE.

DOI： 10.1109/TJMJ.1993.4565713

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A 4/15 code and a 4/11 code have been developed for a magnetooptic disk system with a sampling servo mechanism. We propose the application of PR systems instead of differential detection methods. We also adopt Viterbi detection with PR systems as PRML methods. This paper also proposes another signal detection method which makes use of the unique property of the coding rule for the 4/15 code. The bit error rates of our systems were examined by computer simulation and compared with conventional differential detection. The results show that our proposed systems exhibit excellent performance compared with conventional systems. © 1993, IEEE.

DOI： 10.1109/TJMJ.1993.4565711

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In this paper we have tried to apply several PRML (partial response maximum-likelihood) techniques to a 3B-2T code and a 4B-3T code, both conventional ternary recording codes, and have evaluated the bit error rate (BER) performance for the required S/N at the readout point by using both techniques on state transition and symbol transition matrices. The results show that the PR(1,0,-1) ML technique can be made to provide the best performance among the several combinations of PRML techniques with 3B-2T and 4B-3T codes. © 1993, IEEE.

DOI： 10.1109/TJMJ.1993.4565712

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スマートグリッドとEMC―電力システムの電磁環境設計技術―, 編集： 一般社団法人 電気学会 スマートグリッドとEMC調査専門委員会, 科学情報出版株式会社 , ISBN： 978-4-904774-51-9, 2017/1/30

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Responsible for pages：pp.227-236   Language：Japanese   Book type：Scholarly book

第4章 通信システム機器における電磁環境対策、発刊日2012年12月10日

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ASIN

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Language：Japanese   Publishing type：Lecture material (seminar, tutorial, course, lecture, etc.)  

電力線通信(PLC)機器の開発、システムの開発・設計に携わっている方 【開催日(コース番号・日程)】 N0091 2015年12月08日(火)～12月09日(水) 【受講料】 33,000円 【定員】 12名 （予定）、独立行政法人 高齢・障害・求職者雇用支援機構 高度ポリテクセンター

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Language：Japanese   Publisher：Forum on Information Technology  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The conventional narrowband power-line communication (NB-PLC) is a two-wire system, that has injected its signal between wires with a capacitive coupler. When communicating between floors at a large-sized building, the signal has to travel over long-distances across a switchboard which supplies electricity to distribution boards. Moreover, the signal is attenuated not only at the switchboard but also at distribution boards. Then signal amplifiers have had to be installed at the boards. In this paper, a single wire PLC solution has been proposed to reduce the communication distance and avoid the attenuation by taking a shortcut. It has been described experimentally that the earth could be used as its signal returning path to the signal source. An inductive coupler suitable to this system has been also proposed. The signal attenuation of the proposed system was 30dB better than that of the conventional two-wire system according to our scenario. The achieved performances of PLC modems also showed that the proposed method was useful.

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Signal attenuation is a serious problem of the conventional Narrowband Power-line Communication (NB-PLC) system, which has used neutral and live (N-L) lines. To solve this problem, a new signal transmission system using neutral and protective earth (N-PE) lines has been proposed by the authors, and it had been shown that the system worked well at outlets connected to the same trunk cable. In this paper, the proposed system has been applied to two power-line environments. One was an environment where outlets were connected to different trunk cables. It has been shown that the proposed system achieved 24dB improvement of the attenuation. Another environment was an earth system used in Hawaii which is called TN-S system. It has been shown that the proposed system worked effectively also under the TN-S system.

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太陽光パネルの発電量を見せ合うことで，コミュニティの形成や再生可能エネルギーの利活用の促進を目指す「みんなでおでんき」プロジェクトを筆者らは進めている．本稿では，製作した3種類のスマートメータと，それらの計測データを蓄積するクラウドサーバとの通信手順について述べている．提案するシステムが広く普及することを目的として，オープンソースハードウェアであるArduinoマイコンや，Webサイト上で開発できるmbedマイコンを使ってスマートメータシステムを自作した．また既存の電力測定器もHome Gatewayを経由させることにより，スマートメータ化した．クラウドサーバとの通信は，httpのget/postメソッドを用いて，直観的に分かりやすい実装にしている．またクラウドサービス例として，HEMS (home energy management system)用発電予報サービスを提案し，その予報アルゴリズムについて述べている．The authors have been working on "Minan-De-Odenki" project aims to promote the utilization of renewable energy and form a community by showing the amounts of generating power by solar panels to the community members. In this paper, three types of experimental smart meters and a communication protocol with a cloud server, where the measured data are stored, have been described. To make the proposing system become familiar and widely used, the smart meters were implemented on Arduino microcontrollers which are open source hardware and "mbed" microcontrollers whose software can be developed on a website. It is also explained how to include an existing power meter into the smart meter system by using a proposing home gateway. The communication protocol used the get/post methods of http to make it easy and intuitive. As an example of cloud services, a forecast algorithm of electric power generation for HEMS (home energy management system) has been described.

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「みんなでおでんき」プロジェクトでは，再生可能エネルギーにより発電した電力を，地域やソーシャルコミュニティ内で融通し合うことによって，持続可能な共助システムの構築を目指している．このシステムで必要となる利用者の認証を，本稿では電源コンセントにNFC (near field communication)機能を組み込むことで実現した．非接触ICカードあるいはNFC搭載のスマートフォンをコンセントにかざし，コミュニティメンバーであれば，電気を一定時間使えるようにした．ユーザ登録・管理用のクラウドサービスは，既存のSNS (social networking service)アカウントでもユーザ認証を行えるようにしており，これによりコミュニティ形成の促進をはかっている．"Minna-de-Odenki" project aims to utilize electric power generated by renewable energies in regions among social communities, and to build sustainable and cooperative system. In this paper, user authentification of this system has been proposed to use NFC (near field communication) technology. The community members can utilize electricity for a while when they touch an NFC reader embedded in an outlet with a contactless IC card or a smart phone having the NFC function. Services such as user registration and administration by a cloud server can be achieved after an authentication by using existing SNS (social networking service) accounts. The usage of the SNS accounts may accelerate the formation and activities of a community.

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In this paper, a new signal transmission system for Narrow-Band Power-Line Communications (NB-PLC) has been proposed in order to solve the problems of the conventional systems. The serious signal propagation loss was one of the problems for the differential-mode transmission system, which used the Neutral and Live (N-L) conductors. The proposing system does the Neutral and Protective Earth (N-PE) conductors. In order to compare the proposing N-PE transmission system with the N-L system, Packet Error Rate (PER) performances of 144 pairs of wall outlets for AC100V in the authors' laboratory have been measured. Although the 40% outlet pairs could not communicate at all for the N-L system, the ratio was improved to 4% for the proposed system. Moreover, to verify the results of the PER performances, the transfer function and impedance properties of the outlets were measured and the usefulness of the proposal system has been discussed.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this paper, a new signal transmission system for Narrow-Band Power-Line Communications (NB-PLC) has been proposed in order to solve the problems of the conventional systems. The serious signal propagation loss was one of the problems for the differential-mode transmission system, which used the Neutral and Live (N-L) conductors. The proposing system does the Neutral and Protective Earth (N-PE) conductors. In order to compare the proposing N-PE transmission system with the N-L system, Packet Error Rate (PER) performances of 144 pairs of wall outlets for AC100V in the authors' laboratory have been measured. Although the 40% outlet pairs could not communicate at all for the N-L system, the ratio was improved to 4% for the proposed system. Moreover, to verify the results of the PER performances, the transfer function and impedance properties of the outlets were measured and the usefulness of the proposal system has been discussed.

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再生可能エネルギーによる発電は発生する廃棄物が少ないこと，商用送電網に依存しない電力の地産地消が可能なため災害への耐性が高いという利点があるが，個人が発電設備を設置するにあたっては行政による補助制度と余剰電力買い取り制度以外の普及促進策が無い．本研究では個人が設置した太陽光発電パネルなどの発電設備からスマートメータにより収集した発電量を SNS 上のソーシャルグラフと位置情報により集計し可視化することで，コミュニティの形成，情報交換，競争などが可能な基盤システムの構築に取り組んでおり，再生可能エネルギーの利活用に対する動機づけや普及促進に繋がると期待している．While renewable energy emits small amount of wastes and deals with disaster achieving local production of energy for local consumption, there is only a few promotion including subsidies and surplus electricity trading when individuals are hoping to purchase such power-generating equipment. Our research aims to improve this situation by reinforcing incentives for renewable energy motivating people with social activities such as sharing information and competition. Our system provides visualization of total amount of generated electrical energy by home solar panels and other devices over social community which is determined by social graphs in SNS and location of devices.

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To solve the problems of the conventional alternating current (AC) electricity distribution system essentially, a high-speed PLC communication system, which target speed is 1Gbps, on cargo ships has been developed in this paper. The system was realized over a new direct current (DC) distribution system, which puts low stress on environment. It is shown first that the signal attenuation characteristic of polyethylene-insulator power cables is equal to or better than that of LAN cables and the coaxial cables. Next, installation methods to make the balance performance of the polyethylene cables excellent are proposed. It is experimentally shown that a proposed method of the dual mode transmission for the PLC signals, that is appropriate for the high balanced power-lines, performed 1.9 times throughput at maximum. Moreover, it is described that an LED (Light Emitting Diode) Visible Light Communication (VLC) system was implemented to realize a wireless and seamless network environment with the wired PLC systems.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

Broadband Power-line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. It is a feature of power-line channels in cargo ships, which are the target of this paper, that the amount of the signal attenuation is larger than that in homes. It is the main reason of the attenuation that there are a lot of circuits in distribution panels. Then, the amount of attenuation per circuit has been estimated in this paper, and it is described that the reduction of the number of circuits was the most effective improvement method. The next effective method was to change the insulating material of power-line cables to the lower attenuation one. Moreover, it has been described that the impedance matching at the end of cables might be effective in the improvement of throughput performance, though it doesn't contribute to reduce the amount of the signal attenuation.

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As the injection and reception modes of power-line communication (PLC) signals, two modes of the differential and common can be used, so that there are four kinds of propagation modes. The proposing dual-mode transmission PLC system uses these propagation modes. In this paper, two types of the dual-mode system have been studied. One is called "selective type" that chooses the best propagation mode from four modes. Another type is "simultaneous" type, which utilizes the two injection and reception modes at the same time. To evaluate the proposing systems, two kinds of power distribution systems were constructed, which were assumed as a DC power system in house and ship, respectively. By using these DC power distribution systems, the throughput performance was measured. As a result, if the electrical balance of the power-line channels was good, the throughput of the simultaneous type achieved 1.9 times or more performance comparing to that of the conventional type. Moreover, even if the balance was not good, the obtained performance was equal to or more than that of the conventional type by using the proposing method which used both types properly.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

As the injection and reception modes of power-line communication (PLC) signals, two modes of the differential and common can be used, so that there are four kinds of propagation modes. The proposing dual-mode transmission PLC system uses these propagation modes. In this paper, two types of the dual-mode system have been studied. One is called "selective type" that chooses the best propagation mode from four modes. Another type is "simultaneous" type, which utilizes the two injection and reception modes at the same time. To evaluate the proposing systems, two kinds of power distribution systems were constructed, which were assumed as a DC power system in house and ship, respectively. By using these DC power distribution systems, the throughput performance was measured. As a result, if the electrical balance of the power-line channels was good, the throughput of the simultaneous type achieved 1.9 times or more performance comparing to that of the conventional type. Moreover, even if the balance was not good, the obtained performance was equal to or more than that of the conventional type by using the proposing method which used both types properly.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

Broadband Power-line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. It is a feature of power-line channels in cargo ships, which are the target of this paper, that the amount of the signal attenuation is larger than that in homes. It is the main reason of the attenuation that there are a lot of circuits in distribution panels. Then, the amount of attenuation per circuit has been estimated in this paper, and it is described that the reduction of the number of circuits was the most effective improvement method. The next effective method was to change the insulating material of power-line cables to the lower attenuation one. Moreover, it has been described that the impedance matching at the end of cables might be effective in the improvement of throughput performance, though it doesn't contribute to reduce the amount of the signal attenuation.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

As the injection and reception modes of power-line communication (PLC) signals, two modes of the differential and common can be used, so that there are four kinds of propagation modes. The proposing dual-mode transmission PLC system uses these propagation modes. In this paper, two types of the dual-mode system have been studied. One is called "selective type" that chooses the best propagation mode from four modes. Another type is "simultaneous" type, which utilizes the two injection and reception modes at the same time. To evaluate the proposing systems, two kinds of power distribution systems were constructed, which were assumed as a DC power system in house and ship, respectively. By using these DC power distribution systems, the throughput performance was measured. As a result, if the electrical balance of the power-line channels was good, the throughput of the simultaneous type achieved 1.9 times or more performance comparing to that of the conventional type. Moreover, even if the balance was not good, the obtained performance was equal to or more than that of the conventional type by using the proposing method which used both types properly.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

Broadband Power-line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. It is a feature of power-line channels in cargo ships, which are the target of this paper, that the amount of the signal attenuation is larger than that in homes. It is the main reason of the attenuation that there are a lot of circuits in distribution panels. Then, the amount of attenuation per circuit has been estimated in this paper, and it is described that the reduction of the number of circuits was the most effective improvement method. The next effective method was to change the insulating material of power-line cables to the lower attenuation one. Moreover, it has been described that the impedance matching at the end of cables might be effective in the improvement of throughput performance, though it doesn't contribute to reduce the amount of the signal attenuation.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

As the injection and reception modes of power-line communication (PLC) signals, two modes of the differential and common can be used, so that there are four kinds of propagation modes. The proposing dual-mode transmission PLC system uses these propagation modes. In this paper, two types of the dual-mode system have been studied. One is called "selective type" that chooses the best propagation mode from four modes. Another type is "simultaneous" type, which utilizes the two injection and reception modes at the same time. To evaluate the proposing systems, two kinds of power distribution systems were constructed, which were assumed as a DC power system in house and ship, respectively. By using these DC power distribution systems, the throughput performance was measured. As a result, if the electrical balance of the power-line channels was good, the throughput of the simultaneous type achieved 1.9 times or more performance comparing to that of the conventional type. Moreover, even if the balance was not good, the obtained performance was equal to or more than that of the conventional type by using the proposing method which used both types properly.

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Other Link： http://iyokan.lib.ehime-u.ac.jp/dspace/handle/iyokan/781

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There are a lot of researches on position determination methods in room such as wireless LAN, RFID, infrared ray, TV camera, sound wave and etc. Among them, it is considered that a positioning system using sound has some merits of high measurement accuracy and low cost. In our research group, a positioning system using spread spectrum sound has been developed. So far, a system for measuring distance was developed and evaluation of its measurement accuracy was conducted. As a result of measurement under a condition of no wind, no temperature gradient and no noise, RMSE of 10m distance between a microphone and a speaker was 3.4mm. However, there are various noises, winds and temperature conditions in actual facilities such as fruit grading facilities, greenhouses, and dairy farms. It is, therefore, important to improve noise tolerance and to compensate changeable sound velocity by wind and temperature. In this paper, evaluation of noise tolerance was conducted by using three type sounds.

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Although the conventional PLC (Power Line Communication) modems use only the differential-mode transmission, the authors has proposed the dual-mode transmission that uses the better transmission mode selected from the differential and common modes to increase the channel capacity. However, the mode selection was done manually, so that the adaptive mode control could not be achieved even when the channel condition changed. In this paper, an automatic mode-selection method based on a throughput measurement is proposed. And its evaluation result is also shown.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Although the conventional PLC (Power Line Communication) modems use only the differential-mode transmission, the authors has proposed the dual-mode transmission that uses the better transmission mode selected from the differential and common modes to increase the channel capacity. However, the mode selection was done manually, so that the adaptive mode control could not be achieved even when the channel condition changed. In this paper, an automatic mode-selection method based on a throughput measurement is proposed. And its evaluation result is also shown.

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Power-line Communication (PLC) based local area network (LAN) in ships are one of the promising applications of the PLC technology. In this paper, the delay profiles have been analyzed from the transfer function of 100V power-line channels of residence area in ships and that of 440V power-line channels for reefer containers, which had been measured by the authors. It was found that the characteristics of the delay spread were able to be approximated by a liner function of which the parameters were the length of cable and the delay spread in distribution panels. The cumulative distribution of delay time has also been calculate, and the required guard-interval value for the OFDM system in ships has been shown. In addition, the area where the signal attenuation of common-mode transmission becomes less than that of differential-mode has been studied from the channel model of attenuation.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-line Communication (PLC) based local area network (LAN) in ships are one of the promising applications of the PLC technology. In this paper, the delay profiles have been analyzed from the transfer function of 100V power-line channels of residence area in ships and that of 440V power-line channels for reefer containers, which had been measured by the authors. It was found that the characteristics of the delay spread were able to be approximated by a liner function of which the parameters were the length of cable and the delay spread in distribution panels. The cumulative distribution of delay time has also been calculate, and the required guard-interval value for the OFDM system in ships has been shown. In addition, the area where the signal attenuation of common-mode transmission becomes less than that of differential-mode has been studied from the channel model of attenuation.

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In the container ship, which is a kind of the cargo-carrying vessel, the reefer container is monitored by the power line communication (PLC) on the three-phase 440V electric power line. It uses the band 55kHz-440kHz. However, in recent years it often happens that machinery equipped with the inverter is installed in the ship. Therefore the PLC construction of a system using this frequency band is difficult. Then, the authors studies whether a steadier PLC system can be achieved by using the frequencies in the range of 2MHz or higher. In this paper, the measurement results of the transmission characteristic, the noise characteristic, and unintentional radiation that comes out of a power line in three-phase 440V system of the container ship are shown. These results show that in contrast to what has been done previously, it is possible to perform steady communication using the band 2MHz-20MHz in the differential mode.

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In the container ship, which is a kind of the cargo-carrying vessel, the reefer container is monitored by the power line communication (PLC) on the three-phase 440V electric power line. It uses the band 55kHz-440kHz. However, in recent years it often happens that machinery equipped with the inverter is installed in the ship. Therefore the PLC construction of a system using this frequency band is difficult. Then, the authors studies whether a steadier PLC system can be achieved by using the frequencies in the range of 2MHz or higher. In this paper, the measurement results of the transmission characteristic, the noise characteristic, and unintentional radiation that comes out of a power line in three-phase 440V system of the container ship are shown. These results show that in contrast to what has been done previously, it is possible to perform steady communication using the band 2MHz-20MHz in the differential mode.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In the container ship, which is a kind of the cargo-carrying vessel, the reefer container is monitored by the power line communication (PLC) on the three-phase 440V electric power line. It uses the band 55kHz-440kHz. However, in recent years it often happens that machinery equipped with the inverter is installed in the ship. Therefore the PLC construction of a system using this frequency band is difficult. Then, the authors studies whether a steadier PLC system can be achieved by using the frequencies in the range of 2MHz or higher. In this paper, the measurement results of the transmission characteristic, the noise characteristic, and unintentional radiation that comes out of a power line in three-phase 440V system of the container ship are shown. These results show that in contrast to what has been done previously, it is possible to perform steady communication using the band 2MHz-20MHz in the differential mode.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Virtual low-noise space for operators' working space under noisy environment in facility has been studied so far for keeping safety and comfortable working condition. This paper focuses on operators' location sensing methods and a comparison between the methods of machine vision from top and of Spread Spectrum Acoustic Waves are described. From the experimental results in an orange grading facility, it was observed that the method of machine vision showed small enough measurement error but problems of small measurement area and less robustness. The method of Spread Spectrum Acoustic Waves could show that noise tolerance was 13dB and there were possibilities to enlarge measurement area and to increase operator number in the virtual low-noise space.

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Language：Japanese   Publisher：The Japan Society of Mechanical Engineers  

Virtual low-noise space for operators' working space under noisy environment in facility has been studied so far for keeping safety and comfortable working condition. This paper focuses on operators' location sensing methods and a comparison between the methods of machine vision from top and of Spread Spectrum Acoustic Waves are described. From the experimental results in an orange grading facility, it was observed that the method of machine vision showed small enough measurement error but problems of small measurement area and less robustness. The method of Spread Spectrum Acoustic Waves could show that noise tolerance was 13dB and there were possibilities to enlarge measurement area and to increase operator number in the virtual low-noise space.

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Many types of agricultural facilities for grains, fruits, nuts, and vegetables have been constructed at many places in the world. Although most of operations are mechanized in the facilities, high noise from the mechanical systems often force operators inefficient or unsafe work in the agricultural facilities. Virtual low-noise space for operators' working space under noisy environment in facility has been studied so far for keeping safety and comfortable working condition. In the previous study, machine vision was adopted to determine the location of the user. However, the developed system is only workable for a narrow area of 1.5m2. This paper focuses on operators' location sensing methods by using Spread Spectrum Acoustic Waves. From the experimental results in an orange grading facility, the method of Spread Spectrum Acoustic Waves could show that noise tolerance was 13dB and there were possibilities to enlarge measurement area and to increase operator number in the virtual low-noise space.

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Language：English   Publisher：IEEE  

Control and monitoring is a promising application of power-line communications (PLC) in cargo-carrying ships. The container ship studied in this paper is a type of cargo-carrying ships. The reefer containers on the container ship have been monitored by using PLC over the three-phase 440V line. Since not only reefer containers but also a lot of equipment are connected to the three-phase 440V electric power-line, the obtained speed and quality of the PLC system have been so poor that improvement had been required. To improve the performance, the introduction of the wideband PLC technology is considered in this paper because the conventional PLC system is based on the narrowband PLC technology. There are few reports which describe the channel characteristics of cargo-carrying ships. Although the authors had been measuring the characteristics of 100V lines in the ships since 2007, the characteristics of 440V lines had not measured as yet. In this paper, the measurement results of the transmission characteristics in three-phase 440V electric power-lines of the container ships are explained and modeled. Two transmission modes, differential and common, were examined in the measurement. The results show that it will be possible to perform stable and high -speed PLC systems over long distances using the 3 phase 440V power-line of cargo ships if the differential transmission mode will be used.

DOI： 10.1109/ISPLC.2009.4913432

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Power-Line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. There are two types of ships from the viewpoint of the cable structure. One is all the power-line cables are armored, and another type is partly unarmored cables are used. For example, all the cables in cargo ships whose characteristics we measured at last year, were armored, although the cables in a training ship shown in this paper are unarmored partly. In this paper, the channel characteristic which the cable structure affects has been discussed by comparing the two types of ships. It has been concluded that if the unarmored cable is used in a ship, the common-mode transmission will be more useful than the conventional differential-mode transmission, although the countermeasure against unintentional radiation will be needed at the same time. If all the cables are armored in a ship, the radiation problem will not occur, although a kind of adaptive transmission-mode selection technique will be needed to improve the channel capacity of the conventional differential-mode transmission system.

DOI： 10.1109/ISPLC.2008.4510390

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Power-Line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. However, the unintentional-radiation is the serious problem for ship applications because the PLC system must coexist with the emergency communication system and shortwave broadcasting services. In this paper, a power control method of PLC modems depending on the radiation strength is proposed and examined in a training ship. It is proposed to use an antenna for shortwave radios and a wideband receiver (WBR) to measure the radiation strength. It is shown that the sensitivity of the WBR is 17dB better than that of a spectrum analyzer. And by using the antenna, the WBR can be set up at any cabin in ship to measure the radiation strength. The proposed power-control algorithm consists of two modes, silent and power-control modes. After the environmental noise level is measured in the silent mode, the power level of PLC modems which cause the radiation is lowered to be the same level as the environmental noise level. If modems do not cause the radiation, their power level is raised as much as possible to guarantee the maximum possible throughput under the EMC regulation. By executing the silent mode occasionally, the controlled power level is adapted to the environmental noise level.

DOI： 10.1109/ISPLC.2009.4913417

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Power-Line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. There are two types of ships from the viewpoint of the cable structure. One is all the power-line cables are armored, and another type is partly unarmored cables are used. For example, all the cables in cargo ships whose characteristics we measured at last year, were armored, although the cables in a training ship shown in this paper are unarmored partly. In this paper, the channel characteristic which the cable structure affects has been discussed by comparing the two types of ships. It has been concluded that if the unarmored cable is used in a ship, the common-mode transmission will be more useful than the conventional differential-mode transmission, although the countermeasure against unintentional radiation will be needed at the same time. If all the cables are armored in a ship, the radiation problem will not occur, although a kind of adaptive transmission-mode selection technique will be needed to improve the channel capacity of the conventional differential-mode transmission system.

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DOI： 10.5988/jime.42.6_1007

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-Line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. The authors measured the characteristics of power-line in cargo ships last year. A feature of power distribution systems in the cargo ships is that all power-line cables in the ships are armored. In this paper, the transfer function of the training ship YUGEMARU is shown and compared with that of the cargo ships. The length of YUGEMARU is shorter than that of the cargo ships, and the unarmored power-line cable is partly used. But topology of the distribution system is the same. Furthermore, it is also shown that the degree of unintentional radiation depends on the outlet into which signals are injected.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-Line Communication (PLC) based Local Area Networks (LAN) in ships are one of the promising applications of the PLC technology. The authors measured the characteristics of power-line in cargo ships last year. A feature of power distribution systems in the cargo ships is that all power-line cables in the ships are armored. In this paper, the transfer function of the training ship YUGEMARU is shown and compared with that of the cargo ships. The length of YUGEMARU is shorter than that of the cargo ships, and the unarmored power-line cable is partly used. But topology of the distribution system is the same. Furthermore, it is also shown that the degree of unintentional radiation depends on the outlet into which signals are injected.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

The relay systems for multi-site video conferencing by DV over IP are described. Although a monitor screen has been divided into multi-portions in order to watch the circumstances of remote places for the conventional systems, the required network bandwidth for the relay has been assumed to be large. On the other hand, the proposing system has the feature that the required bandwidth is small (its average is 30Mbps, and the maximum is 60Mbps) since only the video of those who have spoken is transmitted. However, they had to talk while looking at their own faces. To solve the problem, a system using two DV multicast streams is proposed in this paper, while the required bandwidth is still small.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The relay systems for multi-site video conferencing by DV over IP are described. Although a monitor screen has been divided into multi-portions in order to watch the circumstances of remote places for the conventional systems, the required network bandwidth for the relay has been assumed to be large. On the other hand, the proposing system has the feature that the required bandwidth is small (its average is 30Mbps, and the maximum is 60Mbps) since only the video of those who have spoken is transmitted. However, they had to talk while looking at their own faces. To solve the problem, a system using two DV multicast streams is proposed in this paper, while the required bandwidth is still small.

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Language：Japanese   Publisher：The Japan Institute of Marine Engineering  

DOI： 10.5988/jime.42.6_1007

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Language：English   Publisher：IEEE  

The broadband PLC in cargo ships is a long-awaited technology. However the characteristics of power-line channels in the cargo ships have not been studied yet. The most unique point of the channels is that power-line cables used in most Asian cargo ships are shielded. In order to characterize the channel and investigate a suitable PLC system to the cargo ships, some parameters were measured in three typical ships. The parameters were the transfer functions (LCTR, LTR and TTR), LCL and stationary noise spectrum. From these measurements, (1) the required dynamic range of receivers, (2) average attenuation at distribution boards, (3) phase coupling loss and (4) average LCL values were derived in this paper. Since the cables are shielded and the hull provides the good ground, the usage of the common-mode transmission in addition to the conventional differential-mode, which is referred to as a dual-mode transmission system, is also proposed. Therefore the measured parameters above were included the common-mode and mode-conversion properties. As the evidence to support our proposal, some results in which the LCTR values were superior to the TTR values are shown.

DOI： 10.1109/ISPLC.2007.371145

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One of the problems in power-line communications (PLC) is an unnecessary radiation due to the electrical unbalance of power-lines. However, it means that power-lines can work as antennas. In this paper, a beacon signal radiation system by the power-line antenna for time synchronization among wireless and wired nodes is proposed. The considered application of the radiation system is an indoor fine-grained localization, which is determining where a given node is physically located in a room. A preliminary implementation of the localization by an acoustic rangefinder is described. Unlike other published work in this area, our rangefinder uses Direct-Sequence Code Division Multiplexed (DS-CDM) audible sound signals to detect the distance between the receiver node (i.e. microphone) and the reference point (i.e. speaker) inferred from the time of flight of the sound wave. This technique significantly improves performance in obstructed and noisy environments. The obtained localization accuracy was about 1cm in a 4m 2 plane. As a merit of using the power-line antenna, its wideness of the coverage area is also described experimentally by comparing with that of a conventional loop antenna system. © 2006 IEEE.

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Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

DOI： 10.1093/ietfec/e89-a.11.2994

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Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

This paper overviews the high-speed power-line communication (PLC) technology, and the related standardization and regulatory activities are described. PLC modems of 200 Mbps class become a practical use stage in the West, and the standardization activity is active now. The discussion for deregulation is being continued in also Japan, and regulation values have been proposed. Another topic in this paper is a sensor network application of PLC, which is an indoor fine-grained localization system by acoustic Direct-Sequence Code Division Multiplexed (DS-CDM) signals. The obtained average accuracy of the localization in a 4 m(2) plane was 1 cm if there was no obstacle. To realize the localization system, some novel ideas, such as PLC speakers, a synchronization method based on the zero-crossing timing of the mains frequency, and integrated wired/wireless PLC, are introduced.

DOI： 10.1093/ietfec/e89-a.11.3006

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Language：English   Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS  

Although power-line Communications are expected as a promising method to realize an in-home network, one of their difficulties is an unnecessary radiation due to the electrical unbalance of power-line channels. To solve the problem, the statistical data of electrical unbalance based on measurements in the practical fields, that is, many and various Japanese residential power lines, must be collected as the first step. In this paper, a method to produce a longitudinal-conversion-loss (LCL) probe that can be used for the practical measurement is studied. The LCL is a measure of the electrical unbalance, and is often used to determine the impairment of EMC performance of a system by the cabling. To improve the dynamic range of the probe, an adjustment method of the transformers' parameters is proposed. According to our scenario, the obtained dynamic range was better than that of the conventional probe with the frequency band higher than 2 MHz. The achieved improvement was 6 dB at 6 MHz, and 14 dB at 30 MHz, for example. (c) 2006 Wiley Periodicals, Inc.

DOI： 10.1002/eej.20166

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Language：English   Publisher：IEEE  

The authors have proposed a beacon signal radiation system from the power-line for time synchronization among wireless and wired nodes. The considered application of the radiation system is an indoor fine-grained localization. Our rangefinder uses Direct-Sequence Code Division Multiplexed (DS-CDM) audible sound signals. This technique significantly improves performance in obstructed and noisy environments because of the spreading gain. In this paper, it is shown that the obtained average and worst accuracy of the localization in a 4m(2) plane is 1cm and 4cm, respectively, if there is no obstacle. Even if there are obstacles, the proposing method is possible to measure the location by the diffracted sound wave. If the obstacle is relatively small, its accuracy is within 5cm. On the other hand, if the obstacle is relatively large, a method to determine the presence of the large obstacle is proposed. These results are shown experimentally.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

In recent years, high-speed power-line communication (PLC) systems attract attention. In this paper, the PLC systems are classified into three applications, i.e., Internet access, home-network, and inter-house or in-building communications, and their current situations are explained. In them, ultra high-speed (around 200Mbps) PLC systems applied to Internet access (Access BPL) and home-network (HomePlug AV) of the U.S. are the latest topics. However, since these high-speed PLC systems use the high frequency (HF) band, i.e., 2M to 30MHz, the unnecessary radiation from power-lines poses interference to existing radio stations using the same band. Although the HF-band PLC systems are already commercialized in the West where regulation is comparatively loose, it is under examination in Japan whether HF-band use should be permitted. The trend of such regulatory frameworks is also described.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In recent years, high-speed power-line communication (PLC) systems attract attention. In this paper, the PLC systems are classified into three applications, i.e., Internet access, home-network, and inter-house or in-building communications, and their current situations are explained. In them, ultra high-speed (around 200Mbps) PLC systems applied to Internet access (Access BPL) and home-network (HomePlug AV) of the U.S. are the latest topics. However, since these high-speed PLC systems use the high frequency (HF) band, i.e., 2M to 30MHz, the unnecessary radiation from power-lines poses interference to existing radio stations using the same band. Although the HF-band PLC systems are already commercialized in the West where regulation is comparatively loose, it is under examination in Japan whether HF-band use should be permitted. The trend of such regulatory frameworks is also described.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In recent years, high-speed power-line communication (PLC) systems attract attention. In this paper, the PLC systems are classified into three applications, i.e., Internet access, home-network, and inter-house or in-building communications, and their current situations are explained. In them, ultra high-speed (around 200Mbps) PLC systems applied to Internet access (Access BPL) and home-network (HomePlug AV) of the U.S. are the latest topics. However, since these high-speed PLC systems use the high frequency (HF) band, i.e., 2M to 30MHz, the unnecessary radiation from power-lines poses interference to existing radio stations using the same band. Although the HF-band PLC systems are already commercialized in the West where regulation is comparatively loose, it is under examination in Japan whether HF-band use should be permitted. The trend of such regulatory frameworks is also described.

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

In this paper, an implementation method of a repeater for Digital Video (DV) multi-points teleconferencing over FTTH (Fiber To The Home) Internet access services is studied. One of the problems in the conventional DV streaming method was the serious number of packet-losses. This paper shows that the burst packet-transmission caused the problem. By the proposing software method of smoothing the packet intervals, the probability of the burst packet-loss decreased effectively even when PCs working under general propose OS transmitted the packets. The conventional repeater had another problem, which was the long delay time due to the analog to digital conversion for multi-window display processing. The proposed repeater selected automatically the speaker's picture which should be relayed, instead of multi-window displaying, so that the required delay time could be reduced.

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

In this paper, an implementation method of a repeater for Digital Video (DV) multi-points teleconferencing over FTTH (Fiber To The Home) Internet access services is studied. One of the problems in the conventional DV streaming method was the serious number of packet-losses. This paper shows that the burst packet-transmission caused the problem. By the proposing software method of smoothing the packet intervals, the probability of the burst packet-loss decreased effectively even when PCs working under general propose OS transmitted the packets. The conventional repeater had another problem, which was the long delay time due to the analog to digital conversion for multi-window display processing. The proposed repeater selected automatically the speaker's picture which should be relayed, instead of multi-window displaying, so that the required delay time could be reduced.

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

In this paper, an implementation method of a repeater for Digital Video (DV) multi-points teleconferencing over FTTH (Fiber To The Home) Internet access services is studied. One of the problems in the conventional DV streaming method was the serious number of packet-losses. This paper shows that the burst packet-transmission caused the problem. By the proposing software method of smoothing the packet intervals, the probability of the burst packet-loss decreased effectively even when PCs working under general propose OS transmitted the packets. The conventional repeater had another problem, which was the long delay time due to the analog to digital conversion for multi-window display processing. The proposed repeater selected automatically the speaker's picture which should be relayed, instead of multi-window displaying, so that the required delay time could be reduced.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：English  

The common-mode signal transmission and suppression are attractive from the viewpoints of the channel-capacity improvement and adaptive cancellation of the unwanted radiation from the power-line. To study this transmission and suppression, a channel modeling method based on the transmission-matrix theory is proposed in this paper. And the proposed modeling accuracy is evaluated by using an LCL probe which the authors had developed. As an application example of the proposed model, the channel capacity depending on the electrical unbalance of power-line channels is approximated for the common-mode signal transmission. © 2005 IEEE.

DOI： 10.1109/ISPLC.2005.1430498

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Language：English   Publisher：IEEE  

The common-mode signal transmission and suppression are attractive from the viewpoints of the channel-capacity improvement and adaptive cancellation of the unwanted radiation from the power-line. To study this transmission and suppression, a channel modeling method based on the transmission-matrix theory is proposed in this paper. And the proposed modeling accuracy is evaluated by using an LCL probe which the authors had developed. As an application example of the proposed model, the channel capacity depending on the electrical unbalance of power-line channels is approximated for the common-mode signal transmission.

DOI： 10.1109/ISPLC.2005.1430498

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Language：Japanese   Publisher：パーソナルコンピュータユーザ利用技術協会  

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Language：Japanese   Publisher：Ehime University  

Power-line communications (PLC) are classified into three applications, i. e., Internet access, home-network, and inter-house communications, and those current situations in Japan are explained in this paper. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U. S. A., i. e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan, it is also explained that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：Japanese   Publisher：Ehime University  

Power-line communications (PLC) are classified into three applications, i. e., Internet access, home-network, and inter-house communications, and those current situations in Japan are explained in this paper. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U. S. A., i. e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan, it is also explained that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The authors have been developing a real-time transmission program of digital video (DV) data from a high quality video camera over IP networks, and upgraded recently. In this paper, the upgraded points, that is its user-interface, communication protocols, and a solution of packet loss problems are reported. Moreover, the developed program is compared to DVTS that is a well-known program and provides similar functions to our program, and superior points of the proposed program are explained.

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

The authors have been developing a real-time transmission program of digital video (DV) data from a high quality video camera over IP networks, and upgraded recently. In this paper, the upgraded points, that is its user-interface, communication protocols, and a solution of packet loss problems are reported. Moreover, the developed program is compared to DVTS that is a well-known program and provides similar functions to our program, and superior points of the proposed program are explained.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-Line communications (PLC) are classified into three applications, i.e., Internet access, home-network, and inter-house communications, and those current situations in Japan are explained in this paper. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U.S.A., i.e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan, it is also explained that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-Line communications (PLC) are classified into three applications, i.e., Internet access, home-network, and inter-house communications, and those current situations in Japan are explained in this paper. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U.S.A., i.e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan, it is also explained that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：Japanese   Publisher：一般社団法人電子情報通信学会  

Power-Line communications (PLC) are classified into three applications, i.e., Internet access, home-network, and inter-house communications, and those current situations in Japan are explained in this paper. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U.S.A., i.e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan, it is also explained that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：English   Publisher：The Institute of Electrical Engineers of Japan  

Although power-line communications are expected as a promising method to realize an in-home network, one of their difficulties is an unnecessary radiation due to the electrical unbalance of power-line channels. To solve the problem, the statistical data of electrical unbalance based on the measurement at the practical fields, i.e., many and various Japanese residential power-lines, must be collected as the first step. In this paper, a method to produce a longitudinal-conversion-loss (LCL) probe that can be used for the practical measurement is studied. The LCL is a measure of the electrical unbalance, and is often used to determine the impairment of EMC performance of a system by the cabling. To improve the dynamic range of the probe, an adjustment method of transformers' parameters is proposed. According to our scenario, the obtained dynamic range was better than that of the conventional probe with the frequency band higher than 2MHz. The achieved improvement was 6dB at 6MHz, and 14dB at 30MHz, for e ample. © 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejeiss.124.1375

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Although power-line communications are expected as a promising method to realize an in-home network, one of their difficulties is an unnecessary radiation due to the electrical unbalance of power-line channels. To solve the problem, the statistical data of electrical unbalance based on the measurement at the practical fields, i.e., many and various Japanese residential power-lines, must be collected as the first step. In this paper, a method to produce a longitudinal-conversion-loss (LCL) probe that can be used for the practical measurement is studied. The LCL is a measure of the electrical unbalance, and is often used to determine the impairment of EMC performance of a system by the cabling. To improve the dynamic range of the probe, an adjustment method of transformers' parameters is proposed. According to our scenario, the obtained dynamic range was better than that of the conventional probe with the frequency band higher than 2MHz. The achieved improvement was 6dB at 6MHz, and 14dB at 30MHz, for e ample. © 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejeiss.124.1375

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

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DOI： 10.3169/itej.57.399

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

In the previous paper, the authors proposed the cross-referencing template matching algorithm wherein displacements (motion vectors) of adjacent templates are taken account into estimating the displacement of current template. This paper discusses a new method for evaluating the robustness of motion estimation algorithm including the cross-referencing template matching algorithm. The proposed method uses test image sequences corrupted by adding white gaussian random noises. Simulation experiments are conducted applying the proposed method to cross-referencing template matching algorithm.

DOI： 10.11485/itetr.27.14.0_21

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

In the previous paper, the authors proposed the cross-referencing template matching algorithm wherein displacements (motion vectors) of adjacent templates are taken account into estimating the displacement of current template. This paper discusses a new method for evaluating the robustness of motion estimation algorithm including the cross-referencing template matching algorithm. The proposed method uses test image sequences corrupted by adding white gaussian random noises. Simulation experiments are conducted applying the proposed method to cross-referencing template matching algorithm.

DOI： 10.11485/itetr.27.14.0_21

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Language：Japanese   Publisher：Inst. of Image Information and Television Engineers  

入力画像-テンプレート画像間の相互相関係数を帯域制限補間することによって,微少な移動量を精度良く検出する連続的テンプレートマッチング手法がすでに提案されている.同手法においては,相互相関係数を補間して得られる連続関数のピーク位置推定のために,最急降下法に準じた逐次近似計算を行っている.本論文では,フィードフォワード型ニューラルネットワークを用いてこの部分の計算を行う新たなテンプレートマッチング手法を提案している.また,ピーク位置推定のための演算量が提案手法によって大幅に削減できることを実験的に明らかにしている.

DOI： 10.3169/itej.57.399

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DOI： 10.3169/itej.57.530

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DOI： 10.3169/itej.57.399

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DOI： 10.11485/itetaikai.02win.0.65.0

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-line communications (PLC) are classified into three applications, i.e., Internet access, home-network, and inter-house communications, and those trends in Japan are explained. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U.S.A., i.e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan,, it is shown that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Power-line communications (PLC) are classified into three applications, i.e., Internet access, home-network, and inter-house communications, and those trends in Japan are explained. The experiments of Internet access service by Japanese power utility companies and the activity of HomePlug Powerline Alliance in U.S.A., i.e., high speed PLC using HF frequency band (2M to 30MHz) for home-networking, are introduced. To realize the latter technology in Japan,, it is shown that the deregulation and the solution for the interference to the existing radio stations are needed.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Although power-line communication is expected as a promising method to realize an in-home network, one of its difficulties is the wiring scheme, which sometimes affects the signal-attenuation property and sometimes introduces an unnecessary radiation due to the electrical unbalance. These problems may occur, when power-line channels are branched, the length of two signaling-wires is different due to switch circuits, and the conventional layout of ground-wire for outlets with ground connecter is used. In this paper, new wiring schemes are proposed. It is shown that the schemes are effective in improving the transmission characteristic of the power-line channels. Moreover, the scheme allows us to make the phantom transmission available when 3-wires VVF cables are used. The phantom transmission makes the power-line channel-capacity double. Although the electrical unbalance was also improved by the proposed wiring-schemes, their degree was so small. Finally, the suitable balun for the phantom transmission is studied, and the force-balun has achieved a better isolation characteristic when compared to a float-balun.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Although power-line communication is expected as a promising method to realize an in-home network, one of its difficulties is the wiring scheme, which sometimes affects the signal-attenuation property and sometimes introduces an unnecessary radiation due to the electrical unbalance. These problems may occur, when power-line channels are branched, the length of two signaling-wires is different due to switch circuits, and the conventional layout of ground-wire for outlets with ground connecter is used. In this paper, new wiring schemes are proposed. It is shown that the schemes are effective in improving the transmission characteristic of the power-line channels. Moreover, the scheme allows us to make the phantom transmission available when 3-wires VVF cables are used. The phantom transmission makes the power-line channel-capacity double. Although the electrical unbalance was also improved by the proposed wiring-schemes, their degree was so small. Finally, the suitable balun for the phantom transmission is studied, and the force-balun has achieved a better isolation characteristic when compared to a float-balun.

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Language：Japanese   Publisher：Information Processing Society of Japan (IPSJ)  

In this paper, our basic study results of a program, that was developed to transmit high quality video data from a digital video (DV) camera over IP Network in real time, are shown. We propose an algorithm to convert the DV data rate to be slow. It can be used when a packet-loss occurs due to the network congestion. Another algorithm, which can shorten the transmission delay-time, is also proposed. It is realized by dropping the DV frame when the voice is silent in the frame period.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In this paper, our basic study results of a program, that was developed to transmit high quality video data from a digital video (DV) camera over IP Network in real time, are shown. We propose an algorithm to convert the DV data rate to be slow. It can be used when a packet-loss occurs due to the network congestion. Another algorithm, which can shorten the transmission delay-time, is also proposed. It is realized by dropping the DV frame when the voice is silent in the frame period.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication (PLC), which is about 10Mbps, using the high-frequency (HF) band between 2MHz and 30MHz have become active. Since the channel characteristic and the noise property of the band have not studied well, the computer simulation is not enough to develop the PLC system. The experiment using the practical power-line is also necessary to verify the bit-error-rate (BER) performance. In this paper, the BEE. measurement system for the HF-band PLC, in which the modulation method and data-bit-rate are programmable, is proposed. Using the system, the improvement of the BER performance due to the impedance matching at the end of VVF cables, which are widely used as indoor power-line cables in Japan, is shown. And the BER performance using the practical power-line of the authors' laboratory is also measured.

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication (PLC), which is about 10Mbps, using the high-frequency (HF) band between 2MHz and 30MHz have become active. Since the channel characteristic and the noise property of the band have not studied well, the computer simulation is not enough to develop the PLC system. The experiment using the practical power-line is also necessary to verify the bit-error-rate (BER) performance. In this paper, the BEE. measurement system for the HF-band PLC, in which the modulation method and data-bit-rate are programmable, is proposed. Using the system, the improvement of the BER performance due to the impedance matching at the end of VVF cables, which are widely used as indoor power-line cables in Japan, is shown. And the BER performance using the practical power-line of the authors' laboratory is also measured.

CiNii Books

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication (PLC), which is about 10Mbps, using the high-frequency (HF) band between 2MHz and 30MHz have become active. Since the channel characteristic and the noise property of the band have not studied well, the computer simulation is not enough to develop the PLC system. The experiment using the practical power-line is also necessary to verify the bit-error-rate (BER) performance. In this paper, the BER measurement system for the HF-band PLC, in which the modulation method and data-bit-rate are programmable, is proposed. Using the system, the improvement of the BER performance due to the impedance matching at the end of VVF cables, which are widely used as indoor power-line cables in Japan, is shown. And the BER performance using the practical power-line of the authors' laboratory is also measured.

CiNii Books

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication (PLC), which is about 10Mbps, using the high-frequency (HF) band between 2MHz and 30MHz have become active. Since the channel characteristic and the noise property of the band have not studied well, the computer simulation is not enough to develop the PLC system. The experiment using the practical power-line is also necessary to verify the bit-error-rate (BER) performance. In this paper, the BER measurement system for the HF-band PLC, in which the modulation method and data-bit-rate are programmable, is proposed. Using the system, the improvement of the BER performance due to the impedance matching at the end of VVF cables, which are widely used as indoor power-line cables in Japan, is shown. And the BER performance using the practical power-line of the authors' laboratory is also measured.

CiNii Books

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication (PLC), which is about 10Mbps, using the high-frequency (HF) band between 2MHz and 30MHz have become active. Since the channel characteristic and the noise property of the band have not studied well, the computer simulation is not enough to develop the PLC system. The experiment using the practical power-line is also necessary to verify the bit-error-rate (BER) performance. In this paper, the BER measurement system for the HF-band PLC, in which the modulation method and data-bit-rate are programmable, is proposed. Using the system, the improvement of the BER performance due to the impedance matching at the end of VVF cables, which are widely used as indoor power-line cables in Japan, is shown. And the BER performance using the practical power-line of the authors' laboratory is also measured.

CiNii Books

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：Japanese   Publisher：国公立大学センタ-情報システム研究会  

CiNii Books

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Language：Japanese   Publisher：愛媛大学工学部  

CiNii Books

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Language：Japanese   Publisher：愛媛大学工学部  

CiNii Books

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Language：Japanese   Publisher：愛媛大学工学部  

CiNii Books

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Language：Japanese   Publisher：The Institute of Image Electronics Engineers of Japan  

As a standard motion estimation method, the template matching has been used for estimating relatively coarse motion field, wherein each estimated displacement represents the motion of the area with typically 8 by 8 or more pixels. This paper proposes a fast algorithm for the template matching method suitable for estimating high density or fine motion field, wherein each estimated displacement represents the motion of the area with 4 by 4 or less pixels. It is found that the computational complexity of the proposed algorithm is almost independent from the density of motion field and the size of templates.

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Publisher：一般社団法人 映像情報メディア学会  

DOI： 10.11485/itetaikai.02win.0.65.0

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Language：Japanese  

DOI： 10.3169/itej.55.1619

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

DOI： 10.3169/itej.55.1619

CiNii Books

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

DOI： 10.3169/itej.55.1619

Scopus

CiNii Books

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Language：Japanese  

J-GLOBAL

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Language：Japanese  

J-GLOBAL

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Language：Japanese  

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In the interconnection and inter-operating between networks working for different purposes, it is important to manage the networks based on a policy, that is, how to utilize the networks mutually. In this paper, it is studied how to realize the policy-based network offering a QoS(Quality-of-Service) which depends on the user group. The network is realized by using the dynamic VLAN(Virtual LAN) technology which changes depending on user ID, and the ID is administered by Windows' Active Directory. It is verified whether the desired accuracy of a transmission bandwidth assigned by the QoS policy is performed. Furthermore, it is studied by evaluating the accuracy of the assigned bandwidth by the case where the considering traffic uses TCP or UDP.

CiNii Books

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In the interconnection and inter-operating between networks working for different purposes, it is important to manage the networks based on a policy, that is, how to utilize the networks mutually. In this paper, it is studied how to realize the policy-based network offering a QoS(Quality-of-Service)which depends on the user group. The network is realized by using the dynamic VLAN(Virtual LAN)technology which changes depending on user ID, and the ID is administered by Windows'Active Directory. It is verified whether the desired accuracy of a transmission bandwidth assigned by the QoS policy is performed. Furthermore, it is studied by evaluating the accuracy of the assigned bandwidth by the case where the considering traffic uses TCP or UDP.

CiNii Books

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

本論文では, 連続的テンプレートマッチング手法における検出精度と所要SN比の関係を実験的に検討している.ここでは, 入力画像およびテンプレート画像に対して, 互いに統計的に独立な白色ガウス雑音が重畳している場合を仮定している.1/4画素相当の検出精度を実現するためには, 42dB程度のSN比が必要であること, 雑音が存在する場合であっても, 入力画像およびテンプレート画像に対する高域遮断は検出精度の劣化をもたらすことを明らかにしている.

DOI： 10.3169/itej.55.898

CiNii Books

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

DOI： 10.3169/itej.55.898

CiNii Books

J-GLOBAL

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Scopus

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In recent years, wireless-LAN-based indoor communications draw attention due to their high-speed performance. However, in practice, the area where the wireless-LAN can cover is limited because of obstacles such as walls. On the other hand, the transmission rate of power-line communication is lower than that of wireless-LAN, but relatively wider range can be covered. In this paper, the coverage area of the wireless-LAN and power-line-LAN and their effective transmission rate are measured in indoor environments, i.e., an elementary school and a wooden house.

CiNii Books

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In recent years, wireless-LAN-based indoor communications draw attention due to their high-speed performance. However, in practice, the area where the wireless-LAN can cover is limited because of obstacles such as walls. On the other hand, the transmission rate of power-line communication is lower than that of wireless-LAN, but relatively wider range can be covered. In this paper, the coverage area of the wireless-LAN and power-line-LAN and their effective transmission rate are measured in indoor environments, i.e., an elementary school and a wooden house.

CiNii Books

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

In recent years, wireless-LAN-based indoor communications draw attention due to their high-speed performance. However, in practice, the area where the wireless-LAN can cover is limited because of obstacles such as walls. On the other hand, the transmission rate of power-line communication is lower than that of wireless-LAN, but relatively wider range can be covered. In this paper, the coverage area of the wireless-LAN and power-line-LAN and their effective transmission rate are measured in indoor environments, i.e., an elementary school and a wooden house.

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

CiNii Books

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

The continuous template matching method have been proposed in the previous papers in order to realize the precision subpixel displacement detection between subsequent frames of motion pictures. In the proposed method, a successive approximation algorithm adopting partial derivatives was used for maximizing the interpolated cross correlation functions. The authors suggested that using partial derivatives leads to some weakness in the search of the maxima. In this paper, a nueral network based maximization (peak detection) algorithm is proposed in order to resolve the above mentioned fragileness.

DOI： 10.11485/itetr.25.22.0_21

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

In the continuous template matcing method, adopting the bilinear interpolation model in the waveform domainleads to the interpolation of cross correlation coefficients with the third order B-spline function. This paper presents the relationship between the accuracy of displacement detection and required Signal-to-Noise Ratio (SNR) in the contiuous template matching method with the first to 10-th order B-spline interpolation models.

DOI： 10.11485/itetr.25.22.0_15

CiNii Books

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Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

In the continuous template matcing method, adopting the bilinear interpolation model in the waveform domainleads to the interpolation of cross correlation coefficients with the third order B-spline function. This paper presents the relationship between the accuracy of displacement detection and required Signal-to-Noise Ratio (SNR) in the contiuous template matching method with the first to 10-th order B-spline interpolation models.

DOI： 10.11485/itetr.25.22.0_15

CiNii Books

J-GLOBAL

researchmap

Language：Japanese   Publisher：The Institute of Image Information and Television Engineers  

The continuous template matching method have been proposed in the previous papers in order to realize the precision subpixel displacement detection between subsequent frames of motion pictures. In the proposed method, a successive approximation algorithm adopting partial derivatives was used for maximizing the interpolated cross correlation functions. The authors suggested that using partial derivatives leads to some weakness in the search of the maxima. In this paper, a nueral network based maximization (peak detection) algorithm is proposed in order to resolve the above mentioned fragileness.

DOI： 10.11485/itetr.25.22.0_21

CiNii Books

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Language：English  

CiNii Books

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DOI： 10.3169/itej.55.1619

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The digitized information treated in house is increasing rapidly in recent years, so that the demand for home network is also increasing. High-speed power-line communication(PLC)using high-frequency bands is paid attention as a promising method for the home network, because its cabling cost is free. However, its research is not popular in Japan due to the restriction of regulation, i.e., the allowed band is from 10kHz to 450kHz. The channel models of Japanese power-line environments in the high-frequency band have not reported yet. In this paper, the impedance characteristics of household-appliances and power-line channels are measured in the high-frequency band, i.e., from 70kHz to 35MHz. And the transfer function of the channels are also measured and these results are shown.

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Owing to the progress of digitization of multimedia information handled in home, networking in home(referred to as home networks), which includes networks to control houschold appliances. will also progress. Power-line is one of promising channels as the home network, since already-installed line can be used, i.e., wiring-free. In this paper, problems to realize high-speed power-line communications are discussed.

CiNii Books

J-GLOBAL

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Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication(PLC)of several Mbps using the high-frequency band under 30MHz have become active. To realize the high-speed PLC, it is important to know the characteristics of power-line as a communication channel. The power-line channel can be treated as a distributed constant circuit at the high-frequency band. In this paper, the distributed constants of a VVF cable with two wires, which is widely used for the indoor power-line in Japan, are obtained by measuring the relative dielectric constant(ξ_γ)and the dielectric loss-tangent(or dissipation-factor, tanδ).

CiNii Books

J-GLOBAL

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The research and development of high-speed power-line communication(PLC)of several Mbps using the high-frequency band under 30MHz have become active. To realize the high-speed PLC, it is important to know the characteristics of power-line as a communication channel. The power-line channel can be treated as a distributed constant circuit at the high-frequency band. In this paper, the distributed constants of a VVF cable with two wires, which is widely used for the indoor power-line in Japan, are obtained by measuring the relative dielectric constant(ξ_γ)and the dielectric loss-tangent(or dissipation-factor, tanδ).

CiNii Books

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

The digitized information treated in house is increasing rapidly in recent years, so that the demand for home network is also increasing. High-speed power-line communication(PLC)using high-frequency bands is paid attention as a promising method for the home network, because its cabling cost is free. However, its research is not popular in Japan due to the restriction of regulation, i.e., the allowed band is from 10kHz to 450kHz. The channel models of Japanese power-line environments in the high-frequency band have not reported yet. In this paper, the impedance characteristics of household-appliances and power-line channels are measured in the high-frequency band, i.e., from 70kHz to 35MHz. And the transfer function of the channels are also measured and these results are shown.

CiNii Books

researchmap

Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

Owing to the progress of digitization of multimedia information handled in home, networking in home(referred to as home networks), which includes networks to control houschold appliances. will also progress. Power-line is one of promising channels as the home network, since already-installed line can be used, i.e., wiring-free. In this paper, problems to realize high-speed power-line communications are discussed.

CiNii Books

researchmap