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
126 巻 , 5 号
選択された号の論文の16件中1~16を表示しています
論文
<電子・集積回路>
  • Shinji Mikami, Tetsuro Matsuno, Masayuki Miyama, Hiroshi Kawaguchi, Ma ...
    2006 年 126 巻 5 号 p. 565-570
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    This paper describes design and verification of a wireless-interface SoC (system-on-a-chip) for a wireless battery-less mouse with short-range data-communication capability. The SoC comprises an RF transmitter and microcontroller. The SoC, which is powered by an electric generator that exploits gyration energy by dragging the mouse, was fabricated using a TSMC 0.18-um CMOS process. The features of the SoC are the adoption of a simple FSK modulation scheme, single-end configuration on the RF transmitter, and specific microcontroller design for mouse operation. We verified that the RF transmitter can make data communication within a 1-m range at 2.17 mW, and the microcontroller consumes 0.03 mW at 1 MHz, which exhibits that the total power consumption is 2.2 mW. This is sufficiently low for the SoC to operate with energy harvesting.
<医用電子・生体工学>
  • 野中 誉子, 松田 守正, 長谷 智弘
    2006 年 126 巻 5 号 p. 571-578
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    This paper describes an assimilation phenomenon on monochrome images divided from the size of patterns, and proposes an analytical model about this phenomenon. The frequency spectrum of a sample pattern by the discrete Fourier Transform and human visual characteristics by the Butterworth type Low Pass Filter (LPF) are formulized. A two-dimensional model of the relation between the samples and human visual characteristics, which is additionally introduced the concept of a noise level is proposed, and discussed with the assimilation phenomenon qualitatively and quantitatively. Then, a comparative examination of this model is carried out by subjective evaluation, using the visual distance, and the validity is verified. As a result, the analysis using this proposal model, the cut-off frequency of this LPF is set to 20 cycle/degree, its attenuance is set to -20 dB/decade, and the noise level presumes -50 dB. The results almost conformed qualitatively to the results of evaluation experiments in this example.
  • 香川 高弘, 福田 浩士, 宇野 洋二
    2006 年 126 巻 5 号 p. 579-588
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    In this study, we address to quantify the relationship between the significant arm-clutch loading, leg restriction and motor paralysis, and analyze lumbar joint trajectories in the orthotic gait of paraplegic subjects and the ordinary and orthotic gaits of a normal subject using an inverted pendulum model. For the leg restriction, the trajectories are located in front of an equilibrium point of the inverted pendulum, and the loading is higher due to the influence of gravity moment. Comparing the trajectory of paraplegic and normal gait with orthosis in horizontal plane, the trajectory in the paraplegic subjects was rectilinear shape, while that in normal subject was curved in the direction to the equilibrium point. The loading is lower in the curved trajectory than in the straight trajectory because of the trade-off between gravity and inertia. These results suggest that the increase of the distance between the trunk movement and the equilibrium point of the inverted pendulum result in the significant loading due to the leg restriction and motor paralysis in orthotic gait of paraplegics.
<音声画像処理・認識>
<制御・計測>
<ソフトコンピューティング>
<システム>
  • 中條 宏昭, 正野 勇嗣, 一階 良知, 薦田 憲久
    2006 年 126 巻 5 号 p. 631-636
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    The target of this research is a rectangular cutting stock problem against flawed stock rolls, that orders are assigned to the stock rolls avoiding flaws and connecting the stock rolls for efficient assignment. The problem has the feature that total area of all stock rolls is larger than one of orders, so that, first the stock rolls used for assignment are selected from all stock rolls. In order to effectively use the “cumbersome stock rolls", whose assignment evaluation tends to be small, in this research, two methods are proposed; a method of formulizing degree of a cumbersome stock roll, and a method to connect divided stock rolls effectively. In the former method, the degree is expressed from two factors, namely rate of flaws' area and complexity of flaws, and the parameter is added to a total evaluation. In the latter, “improvement degree" of a pair of divided stock rolls is introduced, and the pair whose improvement degree is high, is connected. The proposed method has been applied to real cutting stock problems. It is confirmed that the method can generate the solutions as same level as expert's solutions.
  • 木戸 邦彦, 長谷川 誓一, 薦田 憲久
    2006 年 126 巻 5 号 p. 637-644
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    A community currency is local money that is issued by local governments or Non-Profit Organization (NPO) to support social services. The purpose of introducing community currencies is to regenerate communities by fostering mutual aids among community members. In this paper, we propose a community currency trading method through partial intermediary process, under operational environments without introducing coordinators all the time. In this method, coordinators perform coordination between service users and service providers during several months from the start point of transactions. After the period of coordination, participants spontaneously make transactions based on their trust area and a trust evaluation method based on the number of provided services and complaint information. This method is especially effective to communities with close social networks and low trustworthiness. The proposed method is evaluated through multi-agent simulation.
<ソフトウェア・情報処理>
  • Xin Zhao, Fuji Ren, Shingo Kuroiwa
    2006 年 126 巻 5 号 p. 645-653
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    Noun compounds are frequently encountered construction in nature language processing (NLP), consisting of a sequence of two or more nouns which functions syntactically as one noun. The translation of noun compounds has become a major issue in Machine Translation (MT) due to their frequency of occurrence and high productivity. In our previous studies on Super-Function Based Machine Translation (SFBMT), we have found that noun compounds are very frequently used and difficult to be translated correctly, the overgeneration of noun compounds can be dangerous as it may introduce ambiguity in the translation. In this paper, we discuss the challenges in handling Japanese noun compounds in an SFBMT system, we present a shallow method for translating noun compounds by using a word level translation dictionary and target language monolingual corpus.
  • Atsuko Mutoh, Fumiki Tanahashi, Shohei Kato, Hidenori Itoh
    2006 年 126 巻 5 号 p. 654-660
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    Real-coded genetic algorithms (GAs) are effective methods for function optimization. Generally speaking, the major crossover methods used in real-coded GAs require a large execution time for calculating the fitness of many children at each crossover. Thus, a new crossover method is needed for searching such a large search space efficiently. A novel crossover method that generates children stepwise is proposed and applied to the conventional generation-alternation model. In experiments based on standard test functions and actual problems, the proposed model found an optimal solution 30-40% faster than did the conventional model.
<エレクトロニック・コマース>
  • 佐賀 亮介, 辻 洋
    2006 年 126 巻 5 号 p. 661-666
    発行日: 2006年
    公開日: 2006/08/01
    ジャーナル フリー
    This paper presents a recommender system for TPO (Time, Place, and Occasion)-dependent goods. The TPO-dependent goods have three features: many attributes, multiformity, and high-frequency update. In order to recommend alternatives of the goods, our system (a) abstracts and metrizes the user's preference implied in sales records, and (b) filters massive alternatives by three kinds of methods: High-Angle Search, Low-Angle Search and Neighbor Search. Additionally, this paper describes the improvement method of the recommendation accuracy by memory-based reasoning with user's preference to latter two kinds of search. The numerical simulation for 10,000 user's data and 400,000 sales records has shown their accuracy.
研究開発レター
<医用電子・生体工学>
<通信・ネットワーク>
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