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

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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⁽¹⁾. 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>^[<i>i</i>](<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>_&infin; 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

鵜沼 宗利 安生 健一 武内 良三

出版者

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.115, no.2, pp.212-221, 1995-02-16

参考文献数

16

被引用文献数

14

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

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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 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⁽²³⁾ 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

山田 隆亮 越前 功 手塚 悟 吉浦 裕

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.126, no.9, pp.1127-1137, 2006-09-01

参考文献数

17

被引用文献数

4

---

Emerging broadband networks and high performance of PCs provide new business opportunities of the live video streaming services for the Internet users in sport events or in music concerts. Digital watermarking for video helps to protect the copyright of the video content and the real-time processing is an essential requirement. For the small start of new business, it should be achieved by flexible software without special equipments. This paper describes a novel real-time watermarking system implemented on a commodity PC. We propose the system architecture and methods to shorten watermarking time by reusing the estimated watermark imperceptibility among neighboring frames. A prototype system enables real time processing in a series of capturing NTSC signals, watermarking the video, encoding it to MPEG4 in QGVA, 1Mbps, 30fps style and storing the video for 12 hours in maximum

著者

盛岡 寛史 仲谷 美江 西田 正吾

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.8, pp.1266-1275, 2005-08-01

参考文献数

13

被引用文献数

1

---

This paper proposes an algorithm for synthesizing music suitable for emotions in moving pictures. Our goal is to support multi-media content creation; web page design, animation films and so on. Here we adopt a human dance as a moving picture to examine the availability of our method. Because we think the dance image has high affinity with music. This algorithm is composed of three modules. The first is the module for computing emotions from an input dance image, the second is for computing emotions from music in the database and the last is for selecting music suitable for input dance via an interface of emotion.

著者

朴 永鎰 内田 雅文

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.127, no.10, pp.1811-1812, 2007-10-01

参考文献数

7

被引用文献数

2 2

---

In present, personal identfication system have been used to input identification-numbers and passwords by keyboards and touch panels. When a user enters their identification-numbers and passwords an observer could easily see the user's secret details. In this report, new personal identification, which system constitutes tactile sense information using tactile stimuli and based on the cardinal trait of the tactile sense, is proposed.

著者

久保 理 小林 康弘

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.9, pp.1834-1840, 2004-09-01

参考文献数

9

被引用文献数

1 1

---

Weather derivatives are getting to be powerful tools for weather risk hedging. A popular method which draws out valid prices of weather derivatives is a stochastic modeling approach. In the method, expected payoffs of weather derivatives based on stochastic weather models are regarded as their valid prices. Although useful stochastic models of temperature have been shown, stochastic models of daily rainfall are still being developed. Therefore, it is considered that pricing of daily rainfall derivatives is difficult. This paper shows a new stochastic daily rainfall model for pricing daily rainfall options. The new model in which a modified geometric distribution model is applied can express stochastic features of daily rainfall. Furthermore, this paper also shows that the combination model of the Markov chain rainy day model and the new model can express stochastic features and risks of daily rainfall option payoffs.

著者

太田 正哉 花光 敦 山下 勝己 小南 昌信

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.1951-1957, 2003-11-01

参考文献数

12

---

In cellular mobile communication systems, a channel assignment problem has been extensively studied. In order to avoid exhaustive search, the number of reallocatable channel is limited only one in TPB method which is one of dynamic channel assignment proposed by Chang. In this paper, a dynamic channel assignment by using the maximum neural network with reinforced self-feedback (MNN-RS) is proposed. From numerical experiments, it is confirmed that the proposal improves blocking probability and reduces the probability that blocking probability exceeds arrowable rate. Lastly the proposed model is implemented on Xilinx FPGA XCV300E and scalability is discussed.

著者

黒木 太司 山岡 幸一 石川 頌平 村田 雄介 出穂 剛史 米山 務

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.128, no.6, pp.825-831, 2008-06-01

参考文献数

9

被引用文献数

1

---

An NRD guide pulse radar front-end was fabricated for level sensor applications at 60 GHz. Main emphasis was placed on circuit configuration. Typically, an oscillation power is divided by a junction circuit and is introduced into two parts. One is for transmitting wave, and the other is for LO wave to perform hetero-dyne detection. The frequency of the former is up-converted so as to be different from the frequency of the LO wave, and thus, a power amplifier is installed in the transmitting side due to low output power of the up-converted millimeter-wave. In this paper, we proposed a new circuit configuration, which consists of a Gunn oscillator with two output ports to eliminate a junction circuit, a direct pulse-modulator to obtain a high level transmitting power without an expensive millimeter-wave power amplifier, and a filter-based down-converter with an up-converter as a local oscillator.<br>Range finding was performed by using the NRD guide pulse radar, however multi-reflection occurred between a target and a planar antenna due to a pencil beam radiation of our developing planar antenna, so that precise distance estimation could not be performed for short range detection. With this in mind, an FPGA-based signal processor was developed in order to eliminate such multi-reflection. The sequential sampling method was employed to reduce experimental errors, which were investigated in terms of difference of periods between a modulated pulse train and a sequential sampling clock. The error of range finding was successfully reduced to be less than 2 % for the distance range from 2 m to 10 m under multi-reflection environment.

著者

田中 敏光 松井 健太郎 安形 正人 平野 一視 吉岡 政洋 大西 昇

出版者

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.120, no.1, pp.88-97, 2000-01-01

参考文献数

23

著者

芝 浩二郎 古屋 保 西 省吾 森 邦彦

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.126, no.8, pp.980-989, 2006-08-01

参考文献数

10

被引用文献数

1

---

We developed a prototype of the automatic go-record system using some image processing techniques. This system is composed of three units. Their units are a 1.10GHz laptop PC, a TV camera, and a pair of switches which tell the system to set a go-stone on the go-board. In this paper, we describe our implemented image processing techniques which are the method to generate a go-coordinates, the method to detect a location of a go-stone, and so on. As a result of the experiment on the prototype system, we confirmed that the correct go-record was generated in a stable indoor lighting condition.

著者

伊藤 誠悟 河口 信夫

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.126, no.10, pp.1212-1220, 2006-10-01

参考文献数

17

被引用文献数

17 10

---

本論文では,既設の無線LANアクセスポイントと,既存の無線LANアダプタを用いて端末の位置推定を行う手法を提案する。 本手法では,位置推定を行う場所において各無線LANアクセスポイントからの電波強度を事前に測定し,ユーザはそれらを事前モデルとして保持する。 ユーザは事前モデルと現在ユーザが観測できる無線LANアクセスポイントの電波強度を用いて現在位置を推定する。 しかし,屋内環境において無線LANの受信電波強度はマルチパス等の影響により複雑に変化するため,位置推定を行う際に利用するアクセスポイントを適切に選択する必要がある。 本手法においては端末の位置推定時に,アクセスポイントを選択する段階と位置推定を行う段階の2段階に分けることにより,位置推定のために有用な情報を提供するアクセスポイントを選択し,選択されたアクセスポイントの情報を利用して位置推定を行う。 実験の結果,適切なアクセスポイントを選択し位置推定を行うことにより,位置推定精度の向上を確認したので報告する。 加えて,無線LANによる位置依存アプリケーションを紹介する。

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

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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.