著者
齋藤 彰一 上原 哲太郎 泉 裕 國枝 義敏
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.124, no.8, pp.1546-1555, 2004-08-01

The VPN (Virtual Private Network) technique becomes more and more popular to protect contents of messages and to achieve secure communication from incidents, such as tapping. However, it grow in usage that a VPN server is used on a sub-network in part of an office-wide network. But, a PPTP system included in Windows operating systems cannot establish nested VPN links. Moreover encrypted communication by VPN hides a user of the VPN connection. Consequently, any administrators of network systems can't find out the users of the VPN connection via firewall, moreover can't decide whether if the user is legal or not. In order to solve this problem, we developed a multi step PPTP relay system on a firewall. This system solves all the problems of our previously developed PPTP relay system<sup>(1)</sup>. The new relay system improves security by encrypting through the whole end-to-end communication and abolishing of prior registration of passwords for the next step. Furthermore, transport speed is accelerated, and the restriction of the number of steps on relay is also abolished. By these features the multi step PPTP relay system expands usability.
著者
弓場井 一裕 寺田 真也 平井 淳之
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.131, no.4, pp.773-780, 2011-04-01
参考文献数
12
被引用文献数
1

In model-free controller syntheses, we have no idea whether the designed controller stabilizes the resulting closed-loop system before its implementation. From the view point of safety of the experimental equipment, we should develop the stability test for model-free controller synthesis using the acquired input/output data. Karimi et al. introduced the sufficient stability condition for the closed-loop system and proposed the stability test for NCbT (Noniterative Correlation-based Tuning) for SISO systems. However, since the positions of the plant and the controller have to be swapped in NCbT, its applicability is restricted to SISO systems.<br>This paper proposes to extend the stability test for NCbT to MIMO systems. The basic idea is to use the special reference <i><b>r</b></i><sup>[<i>i</i>]</sup>(<i>t</i>) and to acquire input/output data as many times as the number of plant inputs. The small-gain theorem introduces the sufficient stability condition for the closed-loop system in terms of the <i>H</i><sub>&infin;</sub> norm of the specific transfer function matrix, which is estimated from the acquired input/output data by the spectral analysis method.<br> The effectiveness of the proposed stability test is confirmed by the numerical experiment for LV100 gas turbine engine model and the experiment for tension-and-speed control apparatus.
著者
和久屋 寛 石隈 敬浩
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.130, no.5, pp.882-888, 2010-05-01
参考文献数
17
被引用文献数
1 2

A major feature of the self-organizing map (SOM) is a topology-preserving projection from the input layer to the competitive layer, and it has been used mainly as an analytical tool for discovering underlying rules in the given data set. Even though recent splendid progress in this area, there are few novel ideas to break such a conventional style. On the contrary, based on its distinctive nature, a new method for generating patterns through backward projection from the competitive layer to the input layer is proposed recently. Moreover, a promising technology for producing animation as a series of backward-projected patterns along with any pathways on the competitive layer is presented. Then, in order to carry out further considerations, some computer simulations with a variety of posed stick figures are tried in this paper. After training, four kinds of pathways, which correspond to different movements such as dancing, exercising and walking, are prepared. Though some of them does not contain any training samples, all of them worked well as we have intended in advance. As a result, it is found that the proposed method shows good performance and it is also confirmed its effectiveness.
著者
神谷 達夫 春木 和仁 松田 稔
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.129, no.10, pp.1845-1852, 2009-10-01

This paper presents the experimental evaluation of auditory cognition's effects on visual cognition of video. The influences of seven auditory stimuli on visual recognition are investigated based on experimental data of key-down operations. The key-down operations for locating a moving target by visual and auditory images are monitored by an experiment system originally made by devices including VTR, CRT, Data Recorder, etc.. Regression analysis and EM algorithm are applied to analyzing the experiment data of 350 key-down operations, made with 50 people and 7 auditory stimulus types. The following characteristic results about the influence of auditory stimulus on visual recognition are derived. Firstly, seven people responded too early for every experiment. The average of and the standard deviation of their response times are 439[ms] and 231[ms] respectively. Secondly, the other forty three people responded about 10[ms] after at cases, in which auditory images were presented 30[ms] or 60[ms] before visual images. Also they responded about 10[ms] early at the other cases. Thirdly, as the visual image was dominant information used for the key-down decision making, apparent effects of auditory images on the key-down operation were not measured. Averages and standard deviations of distributions measured by EM algorithm, regarding to 7 auditory stimulus types, are considered and verified with the Card's MHP model of human response.
著者
王 軼群 野澤 博 土方 嘉徳 仲谷 美江 西田 正吾
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.123, no.6, pp.1155-1165, 2003-06-01
被引用文献数
1

This paper deals with spatio-temporal indexing method for moving objects. In our research, we propose XAT (eXtended Adaptive Tree) structure, consisting of spatial trees and temporal trees, for fast search for spatio-temporal data. The searching process in XAT structure is divided into two steps. The first step roughly narrows down the potential solutions (moving objects) according to the given searching range. The last step fixes the real solution by checking the object's moving track. We compare XAT structure and 3D structure, one of the conventional methods, by computer simulation. The result shows that XAT structure works faster than 3D structure when there is difference between the spatial search range and temporal search range and the objects' moving areas are small.
著者
皆川 卓也 斎藤 英雄
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.129, no.5, pp.947-955, 2009-05-01
被引用文献数
1

In this paper, we present an object category recognition method for an information search system which is queried by camera of mobile phone or by servers of internet services. In such a system, processing speed is an important requirement.<br>To improve processing speed, the hierarchical object category recognition technique proposed by Serre<sup>(23)</sup> is modified using Haar-Like features, vector quantization of feature models, and reduction of processing area. In addition, by retaining the information of each feature's position, it compensates the accuracy which is a little reduced in exchange of processing speed. We implemented this method to web server, and proved this system can work in practical processing time. Through the experiment for Caltech-101 image database and natural scene category images, we also confirm the accuracy of our approach.
著者
川口 弘哲 松本 哲也 竹内 義則 工藤 博章 大西 昇
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.130, no.12, pp.2180-2181, 2010-12-01
参考文献数
2

We aim to discover the factors of an unpleasant sound by processing the sound in the frequency domain. The processed sounds have the same amplitude envelope as an unpleasant sound, and consist of only one or two peak frequencies of the original unpleasant sound. Using these sounds, we attempt to specify a frequency band relating to unpleasantness. As a result, the sound with two pair of peak frequencies tends to make subjects feel unpleasant compared with one peak, and subjects feel unpleasant by the sounds having peaks in 2kHz and 9kHz around. Next, we investigate whether the sound becomes unpleasant by adding the amplitude envelope of unpleasant sounds. The result shows that addition of the envelope makes subjects feel unpleasant compared with the carrier alone.
著者
向谷 博明 大屋 英稔 Xu Hua
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.125, no.1, pp.67-76, 2005-01-01

This paper considers the robust stabilization of uncertain multimodeling systems. The guaranteed cost control technique is used to choose the design parameter which is included in the control gain. The ε-independent quadratically stabilizing controller is newly proposed. It is shown that if the reduced order algebraic Riccati equations (AREs) have positive definite stabilizing solution then the closed-loop uncertain multimodeling systems with the proposed controller are quadraticaly stable and have the cost bound. To show the effectiveness of the proposed algorithm, numerical example is included.
著者
林 健一 長嶋 満宏 蘇原 祥夫 和田 英男 梶谷 淳
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.124, no.11, pp.2278-2286, 2004-11-01
参考文献数
6

The low cost improved recognition of an uncooled infrared image processing has been required urgently for the development of high sensitive uncooled sensor like a cooled sensor. In this study, the uncooled infrared image taken by YBaCuO bolometer camera was improved with applying a special low cost image processing systems. The improved image with this processing exhibited not only the edge enhancement in a large contrast area but also the suppression of heat noise in a small contrast area. It is clarified that this improved recognition image processing is easy to realize at low cost, and the demand for this image processing will be expected to grow up as the use of uncooled infrared sensor system increases.
著者
右山 剛 杉村 敦彦 長 篤志 三池 秀敏
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.129, no.5, pp.956-962, 2009-05-01
参考文献数
12
被引用文献数
2

Recently, digital cameras are offering technical advantages rapidly. However, the shot image is different from the sight image generated when that scenery is seen with the naked eye. There are blown-out highlights and crushed blacks in the image that photographed the scenery of wide dynamic range. The problems are hardly generated in the sight image. These are contributory cause of difference between the shot image and the sight image. Blown-out highlights and crushed blacks are caused by the difference of dynamic range between the image sensor installed in a digital camera such as CCD and CMOS and the human visual system. Dynamic range of the shot image is narrower than dynamic range of the sight image. In order to solve the problem, we propose an automatic method to decide an effective exposure range in superposition of edges. We integrate multi-step exposure images using the method. In addition, we try to erase pseudo-edges using the process to blend exposure values. Afterwards, we get a pseudo wide dynamic range image automatically.
著者
服部 正典 大須賀 昭彦 関 俊文 一色 正男 本位田 真一
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.123, no.11, pp.2010-2019, 2003-11-01
参考文献数
12
被引用文献数
1

This paper describes a &ldquo;Ubiquitous Personalize Agent&rdquo; and it&rsquo;s application: &ldquo;Shopping assistance service&rdquo; for ubiquitous environments. Ubiquitous personalize agent is realized based on context reasoning technology. It can determine contexts of users by referring a lot of data which can be retrieved from devices in ubiquitous environments. We also have had an experimental trial of this service. In this paper, we state the technology, service, and evaluation on the experimental trial.
著者
大西 正輝 小田島 正 羅 志偉
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.125, no.6, pp.856-862, 2005-06-01
参考文献数
13
被引用文献数
10 3

Recently, active researches have been performed to increase a robot's intelligence so as to realize the dexterous tasks in complex environment such as in the street or homes. However, since the skillful human-like task ability is so difficult to be formulated for the robot, not only the analytical and theoretical control researches but also the direct human motion mimetic approach is necessary. In this paper, we propose that to realize the environmental interactive task, it is insufficient to replay the human motion along. We show a novel motion generation approach to integrate the cognitive information into the mimic of human motions so as to realize the final complex task by the robot. As a detailed example of the task, we consider on how to carry up a human by cooperating two hands.
著者
椎屋 和久 泉田 喜一郎 デルウィシュ サラハ 外山 太郎
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.123, no.3, pp.511-516, 2003-03-01
参考文献数
11
被引用文献数
2 2

This paper is concerned with the calculation of the epipolar line based on the time series images of a moving monocular camera. The purpose of our research is to present a simple method to calculate the epipolar line with sufficient accuracy for matching between the time series images. In this paper we propose an useful method which allows as to calculate the epipolar line by using the compound sensor that combined a monocular camera and an inertial sensor. The inertial sensor gives us the rotation angles and the accelerated velocity vectors of the camera. First, a pair of camera-images is changed into the relation of parallel stereo vision, by the use of the rotation angles. And the baseline between the parallel images is determined by using the rotation data and the acceleration data. Next, the epipolar line of a targeted point is obtained. Moreover, we show the validity of this method which used the combined sensor that can be applied even when a camera carries out movement of 6 degrees of freedom, by the experiment using the camera images and the inertial sensor's data.
著者
竹内 英世 保黒 政大 梅崎 太造
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.130, no.6, pp.1042-1053, 2010-06-01
参考文献数
29
被引用文献数
2

KARAOKE is a popular amusement for old and young. Many KARAOKE machines have singing evaluation function. However, it is often said that the scores given by KARAOKE machines do not match human evaluation. In this paper a KARAOKE scoring method strongly correlated with human evaluation is proposed. This paper proposes a way to evaluate songs based on the distance between singing pitch and musical scale, employing a vibrato extraction method based on template matching of spectrum. The results show that correlation coefficients between scores given by the proposed system and human evaluation are -0.76&sim;-0.89.
著者
佐藤 立博 三橋 龍一 佐鳥 新 佐々木 一正
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.129, no.6, pp.1094-1100, 2009-06-01
参考文献数
11
被引用文献数
4 1

In recent years, many universities have already launched small satellite on-orbit. Attitude information is important for satellite operation. However, many nano-satellite communication systems used amateur radio by narrow bandwidth frequency segment. Therefore, down-link of attitude information is expected to require substantial time. In this paper, we propose establishment of the attitude estimation method by means of the received radio power. And, satellite attitude information being estimated from the fluctuation of the received power. Then, comparison of satellite data obtained from on-board sensors with ground experiment. One major problem in this approach is the effect of Earth's ionosphere. As the radio signal passes through the ionosphere, the polarization angle is rotated by the Faraday Effect. The detection of attitude by the radiation pattern has been assumed that inaccurate. However, we are get data the spin satellite of liner polarization antenna. As a result, we can estimate 0.12rad/s accuracy of angular velocity measurement. This method can be applied to the attitude detection of many small satellites.
著者
依田 育士 細谷 大輔 坂上 勝彦
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.124, no.3, pp.805-811, 2004-03-01
被引用文献数
9 10

Dozens of people are killed every year when they fall off of train platforms, making this an urgent issue to be addressed by the railroads, especially in the major cities. This concern prompted the present work that is now in progress to develop a Ubiquitous Stereo Vision based system for safety management at the edge of rail station platforms. In this approach, a series of stereo cameras are installed in a row on the ceiling that are pointed downward at the edge of the platform to monitor the disposition of people waiting for the train. The purpose of the system is to determine automatically and in real-time whether anyone or anything is in the danger zone at the very edge of the platform, whether anyone has actually fallen off the platform, or whether there is any sign of these things happening. The system could be configured to automatically switch over to a surveillance monitor or automatically connect to an emergency brake system in the event of trouble.
著者
中谷 多哉子 羽生田 栄一 黒川 利明 直田 繁樹 大須賀 昭彦 児玉 公信 増村 均 中村 正規 田中 立二
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.123, no.4, pp.640-648, 2003-04-01
被引用文献数
1 1

Object-oriented technology is used for the software of the large range, and its application fields are increasing. Object-oriented technology is also accepted naturally in the field of Internet application. Consequently, developments of new kinds of object-oriented technologies have been performed. Agent technology has been developed based on an object-oriented concept, and may have a great evolution with applying to applications of Internet field. In this paper, authors introduce the latest trend and the example of application of such object-oriented technology and agent technology.
著者
英 慎平 上保 徹志 土田 悠太 篠原 寿広 中迫 昇
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)
巻号頁・発行日
vol.129, no.11, pp.2027-2033, 2009-11-01
被引用文献数
3

In many engineering fields, distance to target is very important and fundamental information. Acoustical signal often plays an essential role in measurement of distance. Though there are distance measurement methods using a time delay between transmitted and reflected waves, it is difficult to measure short distance because the reflected waves are often buried in the transmitted wave for short distance. Recently, a method for measuring the short distance has been proposed using standing wave. We applied the fundamental principle of this method to the estimation of short distance using audible sound as a transmitted wave. This method enabled us to obtain range spectrum from power spectrum of composite sound, but it required Fourier Transfom twice. This paper introduces the chirp signal, which is a signal such that the frequency changes with lapse of time, as a transmitted wave, and an interference arises due to the superposition of transmitted and reflected waves. Since the period of power fluctuation for the composite sound is inversely proportional to the distance between microphone and target, we propose a new distance estimation method by using chirp signal as a transmitted wave. Finally, we also confirm the validity of the proposed method through computer simulation and by experiment in an actual sound field.