電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
124 巻, 1 号
選択された号の論文の34件中1~34を表示しています
特集:ユビキタスネットワーク
特集解説
  • 松江 英明, 相河 聡, 久保田 周治, 北條 博史, 渡辺 和二, 斎藤 利生
    2004 年 124 巻 1 号 p. 2-11
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    The key technologies that materialize the ubiquitous service are core network, wireless access and terminal/application. Especially, system design of wireless access placed in the middle of network and terminal is important. By make combining the characteristics wireless terminal portability and broadband optical fiber the realization of the ubiquitous service becomes possible. This paper describes about the introduction and future activity of present condition technology about the wireless access that turned it to the ubiquitous service in this paper.
    This paper expresses the technology activity of 3 fields that are (1) Wireless LAN (2) NWA : Nomadic Wireless Access (3) FWA : Fixed Wireless Access. Furthermore we express about the subject of the future direction nature and wireless access technology of the ubiquitous service based on existing research progress and activity.
  • 森川 博之
    2004 年 124 巻 1 号 p. 12-17
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Two major properties will characterize networks in the future: ‘3C everywhere’ and ‘physical interaction’. These two properties promise a computing infrastructure that seamlessly and ubiquitously aids users in accomplishing their tasks and that renders the actual computing devices and technology largely invisible. This paper begins by providing a brief overview of the emerging technologies that may influence the new ubiquitous network (UbiNet) architecture. The following section presents our STONE (Service Synthesizer on the Net) project at the University of Tokyo. We designed STONE to provide distributed transparency, service consistency, and context-awareness, and explored communication and computation technologies in a sensor-instrumented environment.
特集論文
<電子・集積回路>
  • 吉川 雅弥, 寺井 秀一
    2004 年 124 巻 1 号 p. 18-25
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Deep-Sub-Micron (DSM) technologies of 0.18μm and below enable the integration of logical circuits having more than 10 million gates. In such a DSM technology, it’s important to consider reducing power consumption, improving interconnection delay, and dispersing wire congestion at initial phase of layout design. In this paper, we proposed a novel performance-driven placement algorithm. The proposed algorithm based on Genetic Algorithm(GA) has a two-level hierarchical structure. For selection control, new objective functions are introduced for reducing power consumption, improving interconnection delay and dispersing wire congestion. Studies on floor planning and cell placement have been reported as being applications of GA to the LSI layout problem. However, no studies have ever seen the effect of applying GA in consideration of power, delay and congestion. Results show improvement of 11.7% for the total wire length of the nets with high SW rate, 22.5% for the worst path delay and 15.9% for wire congestion on average.
<センシング>
  • 近 哲也, 大平 豊, 久保田 譲, 渡辺 一弘
    2004 年 124 巻 1 号 p. 26-32
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    A method of a monitoring and remote controlling real world have been described by using a VRML/Java based virtual reality space which contains multimedia elements, intended for the development of a ubiquitous monitoring system. The focuses are given on the improvements for currently used, static virtual reality spaces to be more capable of an interactive function through which users can bilaterally monitor or control the real world. The monitoring is realized by reflecting sensing data from sensors which were placed in the real space onto a virtual reality space. Remote control can be realized by sending commands to actuators through the 3-D space. Additionally, the virtual reality space has been created as a Web page. So that the multiple users can access the system at the same time. The developed system has shown the availability for such applications as robot navigation, management of buildings and monitoring of factories and environments. In this paper, the construction method of the new technique of the real space monitoring and its operation experiment are described which can put in view a full-scall ubiquitous environment. The extendibility and possibility for monitoring are also described which could provide essential ubiquitous environments.
<通信・ネットワーク>
  • 井上 保彦, 齋藤 一賢, 阪田 徹, 守倉 正博, 松江 英明
    2004 年 124 巻 1 号 p. 33-40
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Recent wireless LAN systems, such as IEEE 802.11a and 802.11b, have a multirate mechanism in physical (PHY) layer. In that case, a station selects the data rate to be used for each frame transmission by the rate switching algorithm. Despite the rate switching algorithm have a great impact on the throughput performance, the effect has not been discussed enough. This paper describes a general rate switching algorithm that is actually used in many products and evaluates its effect on the performance of the Medium Access Control (MAC) protocol. And, a new rate switching algorithm is proposed to improve the throughput performance. Although the IEEE 802.11a PHY is assumed in this paper, the proposed algorithm can be applied to the wireless systems that employ CSMA based access control and have a multirate mechanism in PHY layer. Throughput performance and system capacity of the IEEE 802.11 WLAN is analyzed based on the basic frame exchange sequence of IEEE 802.11 MAC protocol. It is shown that the IEEE 802.11 MAC will have much better throughput and system capacity with the proposed algorithm.
  • 糸川 喜代彦, 北 直樹, 佐藤 明雄, 松江 英明, 森 大典, 渡邉 浩伸
    2004 年 124 巻 1 号 p. 41-48
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    5-GHz band wireless access systems, such as the RLAN (Radio Local Area Network) system of IEEE802.11a, HiperLAN/2, HiSWANa and AWA, are developed and provide transmission rates over 20 Mbps for indoor use. Those 5-GHz access systems are expected to extend service areas from the office to the so-called “hot-spot" in public areas. Underground shopping malls are one of the anticipated service areas for such a nomadic wireless access service. Broadband propagation characteristics are required for radio zone design in an underground mall environment despite previous results obtained by narrow band measurements.
    This paper presents results of an experimental study on the propagation characteristics for broadband wireless access systems in an underground mall environment. First, broadband propagation path loss is measured and formulated considering human body shadowing. A ray trace simulation is used to clarify the basic propagation mechanism in such a closed environment. Next, a distance dependency of the delay spread during a crowded time period, rush hour, is found to be at most 65 nsec, which is under the permitted maximum value of the present 5-GHz systems. Finally, above propagation characteristics support the result of transmission test carried out by using AWA equipment.
  • 杉浦 彰彦, デルマワン チャンドラ
    2004 年 124 巻 1 号 p. 49-55
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    At present, in the Intelligent Transport Systems (ITS) field, research continues In-Vehicle Communication (VC), Inter-Vehicle Communication (IVC), Road-to-Vehicle Communication (RVC), etc. All information communications technology, especially radio-communications technology, was applied. For example, wireless 1394 is used in VC, millimeter-wave communication is used in IVC, and Radio on Fiber (ROF) communication technology is used in RVC. However, it is actually very difficult to design for and accommodate all of these systems. This research, to simplify a design, equipment, structure, cost down of production of VC, IVC, and RVC, utilizes a wireless Bluetooth technology system. In this paper, since the whole system is connected to the Internet backbone, provided some access point area, the Internet can be accessed from inside the vehicle and information, such as news and weather information, can be downloaded. It is also possible to know traffic information for each access point area by accessing a home memory (data base server.
<ソフトコンピューティング>
  • 岡宅 泰邦, 奥富 秀俊, 吉岡 信和, 大岸 伸之, 本位田 真一
    2004 年 124 巻 1 号 p. 56-63
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    We propose a system architecture for mobile agents to improve their security in the environments of insecure networks and non-sophisticated terminals such as PDAs. As mobile agents freely migrate onto their favorite terminals through insecure networks or terminals, it is not appropriate for them to store some secret information for authentication and encryption/decryption. We introduce one and more secure nodes(OASIS NODE) for securely generating and verifying authentication codes. The each agent’s data are encrypted by a pseudo-chaos cipher mechanism which doesn’t need any floating processing co-processor. We’ve constructed a prototype system on a Java mobile agent framework, “Bee-gent" which implements the proposed authentication and cipher mechanisms, and evaluated their performances and their applicability to business fields such as an auction system by mobile agents.
<システム>
論文
<医用電子・生体工学>
  • 内田 雅文, 野澤 昭雄, 井出 英人
    2004 年 124 巻 1 号 p. 73-78
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In this study, we have proposed the technique that presents information to a tactile by using only one vibrator. The proposal of this study is a technique to present with multiplexing information by using modulated vibration. This modulated vibration consists with two frequency components. At this time, a certain modulated vibration is expressed as one point in the frequency region. As for achieving informational presentation which employed this region, we must make the differential limen characteristic in this region clear. In the previous report, we proposed the evaluation technique of the stimulus difference by using the ERP (event-related potential) which processed an average. However, there was a problem in the mesurement efficiency of the ERP to use an average waveform.
      In this paper, we propose the technique made to solve this problem. Our proposal is the technique which evaluates the stimulus difference by using the single trial waveform of the ERP. As a result of the experiment, we confirmed that it could get the evaluation which was equal to the psychophysical quantity by about 60% of the mesurement number of times at the case of the evaluation by using an average waveform of the ERP.
<通信・ネットワーク>
  • 渡邊 一輝, 陳 延偉, 成枝 秀介, 山下 勝巳
    2004 年 124 巻 1 号 p. 79-83
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    High speed communication channels are usually impaired by nonlinear inter-symbol interference(ISI) and additive noise. In order to reconstruct the transmitted data sequence, the ISI must be compensated at the receiver, this is referred to as channel equalization. The blind channel equalization techniques should be done based only on the received sequence and known statistics of the input. In this paper, we propose a new blind method based on higher-order cumulants fitting for nonlinear channel, in which a 4th-order cumulant is used as a constraint instead of the 2nd-order statistic in order to smooth out the additive gaussian noise. Furthermore, in order to avoid convergence to local minima and obtain good convergence performance, a simplex-GA hybrid optimization is used to estimate the unknown parameter. Finally we use maximum likelihood sequence estimation(MLSE) equalizer for reconstructing input signals.
  • 土屋 如右, 富山 薫順, 田中 公男
    2004 年 124 巻 1 号 p. 84-93
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Recently, it has a tendency to reduce an error correction and flow control in order to realize a high speed transmission in a burst transmission systems such as ATM network, IP (Internet Protocol) network, frame relay and so on. Therefore a degradation of network quality, an information loss caused by buffer overflow and decrease of average bit error rate, are occurred, especially for high speed information such as high definition television signals, it is necessary to improve these degradations.
    This paper proposes one of the typical reconstruction methods of lost information and an improvement of average bit error rate. In order to analyse the degradation phenomena, the Gilbert model is introduced for burst errors and the Fluid flow model for buffer overflow.
    This method is applied to ATM network which mainly transmit a video signals and it makes clear that proposed method is useful for high speed transmission.
  • 田 学軍, 井手口 哲夫, 奥田 隆史
    2004 年 124 巻 1 号 p. 94-100
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In area where there is a little or no infrastructure or the existing infrastructure is inconvenient to use, wireless mobile users may still be able to communicate through the formation of an Ad Hoc network. The protocol of medium access in Ad Hoc networks with the time-varying network toplogy is related to the efficiency of network. Recently, since the method using multichannel can obtain higher throughput than conventional methods using single radio channel, some protocols have been researched, such as CATS. For CATS, there is a problem that the transmission will be deadlocked in case of high load. In this paper, improving backoff algorithm of media access scheme over single radio channel used as the control channel in Ad Hoc network, we propose a novel protocol for channel reservation named multichannel reservation protocol (MCRP) and provide estimates of its performance. The results show that the proposed protocol can work well even in case of high load with no deadlock.
<音声画像処理・認識>
  • 村口 孝明, 池田 美鈴, 中村 納
    2004 年 124 巻 1 号 p. 101-111
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In this paper, a new effective algorithm for isolating spectacles fromfacial images is presented.
    In the biometric person authentication through facial images, many faces with spectacles must be taken into account. However, the verification of the two images between one face with spectacles (input image, for instance) and another face without spectacles (registered image, for instance), which are taken from the same person, are not considered in the conventional system and have not been investigated thus far. In the practical case, however, these conditions are frequently considered.
    To expect a high matching ratio and stability for distinguishing a person from others, an effective method of isolating spectacles from facial images with spectacles must be developed.
    From this point of view, an effective method to isolate spectacles from facial images and the results of the experiment that occurred are presented.
    By using many types of spectacles, the efficacy of the proposed method was examined. As a result, 81.2% of extraction accuracy was obtained.
  • 大美 英一, 斉藤 文彦
    2004 年 124 巻 1 号 p. 112-118
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    This paper proposes a method to measure the inclined angle of an objective image based on the most frequent edge direction. This paper also describes a relation between the measured inclined angles by the proposal method and the visual inclined angles. An edge direction is changed according to the inclination of an objective image. The most frequent edge direction is supposed to show the global inclination of the image. The proposed method measures the inclined angle of the image by detecting the edge direction with the peak in the histogram that represents the distribution of all edge directions in the image. The experimental results show that the measured inclined angles by the proposed method were similar to the visual inclined angles evaluated by the subjects.
  • Huiqin Jiang, Jianming Lu, Takashi Yahagi
    2004 年 124 巻 1 号 p. 119-127
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In the development of an automatic inspection device for inspecting the quality of printed circuit boards, it is necessary to be able to detect precisely and quickly the position of the demarcation line between two very close components on a printed circuit board. In this study, first this problem is changed to the problem of singularity detection in signals. Second, a new algorithm based on a fast biorthogonal spline wavelet transform (FBSWT) is proposed. According to the experimental results presented, the efficiency of the proposed algorithm is demonstrated.
  • 明石 卓也, 満倉 靖恵, 福見 稔, 赤松 則男
    2004 年 124 巻 1 号 p. 128-137
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In this paper, a lips extraction method that can extract lips region from varying lips shape at the moment of speech by using only one template image is described. The method that is proposed in this paper, has invariance for an open and closed mouth, showing or not showing any teeth, and has high speed and high extraction accuracy in consideration for characteristics of the lips by using a genetic method. This method uses the template matching using a genetic algorithm. Furthermore, color of lips and characteristics of the lips shape variances at the moment of speech in this system are utilized. The effectiveness of this method is demonstrated with only one template for each person being tested and a search object, that is, the varying lips shape at the moment of speech of vowels by means of computer simulations. These computer simulations indicate that this method can extract the varying lips shape at the moment of speech by using only one template. Moreover, in the extraction processing of every vowel, a high speed and high extraction accuracy can be obtained.
  • 吉岡 理文, 藤中 透, 大松 繁
    2004 年 124 巻 1 号 p. 138-144
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In recent years, it has become important to develop a pattern detection method in the industrial field. Many methods have been proposed for the pattern detection. However, most of these methods have required high computational costs or vast memories to be implemented in small equipments. In this paper, we propose a new scale and rotation invariant pattern detection method using the phase information. This method mainly requires multiplications and additions, and the computational cost of the proposed method is low. Finally, we show the effectiveness of the method by simulations.
<制御・計測>
<ソフトコンピューティング>
  • 小林 正樹
    2004 年 124 巻 1 号 p. 150-156
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Several models of high dimensional neural networks have been proposed. Complex neural networks are two dimensional neural networks. They has been investigated more than other high dimensional neural networks. Three-dimensional neural networks are Nitta’s 3D model, a model using quaternion numbers and an exterior model. Nitta’s 3D model and the model using quaternion numbers have rotational properties. The inherent properties of exterior model, however, have not been clearfied. We propose Hopfield network using exterior product to investigate exterior model. Real and complex numbers holds commutative and connection laws, but exterior product does not. Therefore it can not use similar discussions. In this paper, we show that the learning method similar to hebbian rule is useful.
  • 坂口 善規, 小澤 誠一, 小谷 学
    2004 年 124 巻 1 号 p. 157-163
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Recently, Independent Component Analysis (ICA) has been applied to not only problems of blind signal separation, but also feature extraction of patterns. However, the effectiveness of pattern features extracted by conventional ICA algorithms depends on pattern sets; that is, how patterns are distributed in the feature space. As one of the reasons, we have pointed out that ICA features are obtained by increasing only their independence even if the class information is available. In this context, we can expect that more high-performance features can be obtained by introducing the class information into conventional ICA algorithms.
    In this paper, we propose a supervised ICA (SICA) that maximizes Mahalanobis distance between features of different classes as well as maximize their independence. In the first experiment, two-dimensional artificial data are applied to the proposed SICA algorithm to see how maximizing Mahalanobis distance works well in the feature extraction. As a result, we demonstrate that the proposed SICA algorithm gives good features with high separability as compared with principal component analysis and a conventional ICA. In the second experiment, the recognition performance of features extracted by the proposed SICA is evaluated using the three data sets of UCI Machine Learning Repository. From the results, we show that the better recognition accuracy is obtained using our proposed SICA. Furthermore, we show that pattern features extracted by SICA are better than those extracted by only maximizing the Mahalanobis distance.
  • 松平 智史, 萩原 将文
    2004 年 124 巻 1 号 p. 164-169
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    In this paper, we propose a catchcopy creation support system. In respect of a vocabulary and getting an idea, it is difficult for inexperienced people to make a catch copy. This system will support users from these points. In the system, EDR electronic dictionary and Genetic Programming are employed. EDR electronic dictionary which has large-scale knowledge is used as a knowledge base. Genetic programing is used to make catchcopy using some words chosen by user. Proposed system requires arbitrary number of words as an input, and shows words relevant to the input. User chooses words from displayed words. Candidates of catchcopy are made by genetic programing algorithm using chosen words. We implemented a catchcopy creation support system from a viewpoint of a way-of-thinking support tool.
  • 伊藤 稔, 杉坂 政典
    2004 年 124 巻 1 号 p. 170-175
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    It is one of the important problems to maintain the diversity in genetic algorithm. Generally, when the diversity is not fully maintained, it is difficult to find good solution. In this paper, we propose an elite correlation selection operator as a new selection operator to improve the genotype diversity in genetic search process. The proposed method selects individuals with a fitness and a genotype correlation between individuals. As a measure of the correlation, we use the hamming distance of the genotype. The performance of the proposed method is examined with variable knapsack problem. We compare the performance of the proposed method with conventional methods. The experimental results show good performance.
<システム>
  • 丸尾 友朗, 松本 啓之亮, 森 直樹, 北山 匡史, 泉井 良夫
    2004 年 124 巻 1 号 p. 176-181
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Web services are regarded as a new application paradigm in the world of the Internet. On the other hand, many business models of a power trading system has been proposed to aim at load reduction by consumers cooperating with electric power suppliers in an electric power market. Then, we propose a network model of power trading system using Web service in this paper. The adaptability of Web services to power trading system was checked in the prototype of our network model and we got good results for it. Each server provides functions as a SOAP server, and it is coupled loosely with each other through SOAP. Storing SOAP message in HTTP packet can establish the penetration communication way that is not conscious of a firewall. Switching of a dynamic server is possible by means of rewriting the server point information on WSDL at the time of obstacle generating.
  • Jun Sawamoto
    2004 年 124 巻 1 号 p. 182-188
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    We propose a cooperative multiagent system for solving the delivery scheduling problem where the environment changes dynamically. In the truck delivery problem, the environmental conditions such as the traffic condition of roads changes and additional delivery orders arrive dynamically during the execution of the delivery, then the reactive and adaptive measures are required to cope with such situations. Multiple agents for the delivery center and delivery trucks cooperate to cope with the re-scheduling problem of additionally arriving orders after once the delivery has started according to the initial delivery plan. We show that the proposed method provides a flexible solution for the dynamic re-scheduling problem.
  • 岡 宏憲, 長谷川 努, 一階 良知, 薦田 憲久
    2004 年 124 巻 1 号 p. 189-195
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    A bilateral exchange and distribution negotiation problem is a problem that two persons that both have demands for maximum evaluations or satisfying constraints decide an agreement plan about transition of resources which satisfies their demands when they distribute and/or exchange the resources. Each negotiator has a private scheduling problem in which the agreement plan becomes parts of constraints, and it is important whether the scheme which is scheduled with the agreement plan satisfies his/her own demands or not. In this paper, the problem is formulated with two kinds of conditions as the measuring sticks for satisfaction to the demands at a scheme, and the negotiation method which solves the problem by transmitting candidates of agreement plans (called “plans") and the evaluations of the plans between the negotiators is proposed. In this method, a plan is created by improving one created by the opponent with purpose analysis knowledge which shows the way to improve plans, and an agreement plan is searched by the repeat of improving plans alternately. The proposed method is applied to a negotiation problem between companies, and the effectiveness of the method is confirmed.
  • 中田 秀男, 佐野 達郎, 小島 泰三, 瀬尾 和男, 内田 智之, 中村 泰明
    2004 年 124 巻 1 号 p. 196-203
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    This paper describes the automatic generation of system descriptions for SCADA (Supervisory Control And Data Acquisition) systems. The proposed method produces various types of data and programs for SCADA systems from equipment definitions using conversion rules. At first, this method makes directed graphs, which represent connections between the equipment, from equipment definitions. System descriptions are generated using the conversion rules, by analyzing these directed graphs, and finding the groups of equipment that involve similar operations. This method can make the conversion rules multi levels by using the composition of graphs, and can reduce the number of rules. The developer can define and manage these rules efficiently.
<エレクトロニック・コマース>
  • 深谷 清之, 薦田 憲久
    2004 年 124 巻 1 号 p. 204-210
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    Accompanying the spread of Internet and the change of business models, electronic commerce expands buisness areas. Electronic finance commerce becomes popular and especially online security tradings becoome very popular in this area. This online securitiy tradings have some good points such as less mistakes than telephone calls. In order to expand this online security tradings, the transfer of the security paper is one the largest problems to be solved. Because it takes a few days to transfer the security paper from a seller to a buyer. So the dematerialization of security papers is one of the solutions. The demterilization needs the information systems for setteling security. Some countries such as France, German, United Kingdom and U.S.A. have been strating the dematerialization projects. The legacy assesments on these projects focus from the viewpoint of the legal schemes only and there is no assessment from system architectures. This paper focuses on the information system scheme and valuates these dematerlization projects by AHP methods from the viewpoints of “dematerializaion of security papers", “speed of transfer", “usefulness on the system" and “accumulation of risks". This is the first case of valuations on security settlements systems by AHP methods, especially four counties’ systems.
研究開発レター
<医用電子・生体工学>
<通信・ネットワーク>
<音声画像処理・認識>
  • Yukinori Suzuki, Yasue Sasaki
    2004 年 124 巻 1 号 p. 219-220
    発行日: 2004年
    公開日: 2004/04/01
    ジャーナル フリー
    A self-organizing tree (S-TREE) has a self-organizing capability and better performance than previously reported tree-structured clustering. In the S-TREE algorithm, since a tree grows in greedy fashion, a pruning mechanism is necessary to reduce the effect of bad leaf nodes. Extra nodes are pruned when the tree reaches a predetermined maximum size (U). U is problem-dependent and is therefore difficult to specify beforehand. Furthermore, since U gives the limit of tree growth and also prevents self-organizing of the tree, it may produce unnatural clustering. We are presenting a new pruning algorithm without U. In this paper, we present results showing the performance of the new pruning algorithm using samples generated from normal distributions. The results of computational experiments showed that the new pruning algorithm works well for clustering of those samples.
〈制御・計測〉
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