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, 3 号
選択された号の論文の31件中1~31を表示しています
論文
<光・量子エレクトロニクス>
<医用電子・生体工学>
  • 尹 鍾賢, 水戸部 一孝, 片寄 喜久, 小川 純一, 吉村 昇
    2006 年 126 巻 3 号 p. 306-312
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    In this paper, we prepared a far infrared ray (FIR) heater having excellent radiation characteristics, and investigated the applicable possibility in the test of breast cancer using a heating process of body surface by FIR heater. After Breast thermal images have been taken by IR camera, temperature difference and temperature rise property (dTs/dTr) were analyzed in the region of malignancy, blood vessel and normal tissue after heating 1min, 2min and 8min. From the temperature difference of malignancy-normal tissue region and blood vessel-malignancy, there was the difference according to the stage of tumor, and the significance from just before heating and after heating 1minute was found. In order to improve the discrimination of each region, dTs/dTr value was analyzed in after heating 1min. As a result, it was confirmed that dTs/dTr value is different from malignancy, blood vessel and normal tissue, and possibility of test of breast cancer was confirmed by heating process of body surface using FIR heater.
  • 野澤 昭雄, 森 直樹, 井出 英人
    2006 年 126 巻 3 号 p. 313-318
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    It is said that the physical and mental state is reflected on the walking motion well. The walking motion shows the psychosomatic state in other words. The purpose of this study is to consider correlation of walking motion and the psychosomatic state. The walking motion is defined by the fixed point observation of the legs using the motion image of front view. The Measuring points are four points in all, which are both knees and both tiptoes. The features of the walking motion was extracted from time series data of the length between measuring points which was measured from the motion images. Principal component analysis was conducted with those charecteristics. Then multiple linear regression analysis was also conducted with principal component scores. As a result, psychosmatic state of each subject was estimated by walking movement.
  • 安野 恵実子, 趙 学麗, 木内 陽介, 森本 忠興
    2006 年 126 巻 3 号 p. 319-326
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    In this paper, a new configuration of the electrodes, called divided electrode, is proposed for a short time measurement of bio-impedance in a cross section of a local tissue. Its capability is examined by computer simulations, where a distributed equivalent circuit is used as a model of the tissue. Estimation of impedance parameters is carried out by use of the Gauss-Newton Method. As a result of them, usefulness of the proposed method is confirmed by computer simulations using a typical layered tissue model.
  • 野中 誉子, 松田 守正, 長谷 智弘
    2006 年 126 巻 3 号 p. 327-332
    発行日: 2006年
    公開日: 2006/06/01
    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 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 cycles/degree, and the noise level presumes -45 dB. The results almost conformed qualitatively to the results of evaluation experiments in this example.
  • Masayoshi Tsubai, Toshihiro Nishimura
    2006 年 126 巻 3 号 p. 333-338
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    We propose fast algorithms for gray-scale morphology by double structuring elements (DSEs). The fast algorithms are implemented with chain rule and decomposition of the DSEs. The DSE allows morphological openings to sharpen edges of the image components, changing shape of the domain and gray values of the DSE with respect to spatial positions to adapt them for local structure. In application to contrast enhancement of ultrasound image, the proposed method improves the contrast of tissue boundaries without speckle emphasis. The proposed method shows better performance both in sharpening and in computational complexity, compared to the conventional morphological sharpening with spatially invariant domain of the DSE.
<通信・ネットワーク>
  • Dongguo Li, Bin Guo, Katsumi Yamashita
    2006 年 126 巻 3 号 p. 339-346
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    Multiple-input multiple-output (MIMO) technique combined with orthogonal frequency division multiplexing (OFDM) modulation has a great potential for the coming broadband wireless communications standard. However, MIMO-OFDM system inherits the weakness of the OFDM to channel time-variation. Therefore, channel estimation is a key problem in MIMO-OFDM systems. In this paper, we propose an effective stagger time domain pilot structure, which can avoid the time domain cross interference in pilot section, thus help the channel estimator to obtain uncorrupted channel fading envelopes. Based on these estimates, the cascaded equalizer must eliminate both the ICI and the cross interference among the antennas to recover the transmitted signals. Here, by sufficiently exploiting the underlying structure of system transfer matrix, we propose a downsizing minimum mean square error (MMSE) equalizer, which can not only achieve the satisfied approximation to the conventional MMSE equalizer, but also reduce the computational complexity significantly. The validity of the proposed pilot structure and the downsizing MMSE equalizer is demonstrated by computer simulations.
<マルチメディア>
<音声画像処理・認識>
  • 斉藤 文彦
    2006 年 126 巻 3 号 p. 361-367
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    Image template matching has been applied to various applications because it can search a similar partial image area to a registered template image in an objective gray-scaled image. This paper proposes a method to search a target image area that has free location and free inclination to a template image. The proposed method uses the variance of local edge directions that is an invariant parameter to the changes of location and inclination of an objective image pattern. High speed matching is expected because the method uses only local information around each edge pixel. The experimental results show that the averaged recognition rate about four kinds of experimental images recorded 99.6%. The proper target image areas were searched in the objective images with free locations and free inclinations. The averaged processing time was 0.16 second.
  • Toshiyuki Tanaka, Junko Nemoto, Manami Ohta, Takanobu Kunihiro
    2006 年 126 巻 3 号 p. 368-375
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    At present in medical field, the 40 point method and facial nerve grading system (House-Brackmann method) are generally used for assessment of facial palsy. However, those methods have limitation in the precise assessment, because of subjectivity in diagnosis. Purpose of this paper is to propose objective and quantitative assessment of facial palsy based on the amount of feature point movements on the face. Facial nerve symptoms generally appear in either of right and left side on the face. In facial expression of palsy subjects, the motion on the diseased side becomes smaller than that on the healthy side. We defined some indices of palsy severity from the observation of facial expression. Those indices showed the asymmetry of the facial motion quantitatively. We confirmed that our proposed method was valid for assessment of the facial palsy by comparison with the 40 point method.
<制御・計測>
<ソフトウェア・情報処理>
  • 中辻 秀人, 大松 繁
    2006 年 126 巻 3 号 p. 383-388
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    For signal analysis, Fourier transform and linear prediction methods are the main approaches. In recent years, wavelet transform which gives the expression of time-frequency domain has been receiving attention. In the wavelet transform, scale and shift operations are used to analyze regional waves in signal. In this paper, we propose a new method for signal analysis. Instead of the wavelet, short sine waves and short cosine waves which have slightly different frequencies and phases established beforehand are used. These frequencies and phases play the same role as a wavelet to analyze a regional wave in signal. However, our proposed method is different from the wavelet transform because it does not use multi-resolution analysis. In conventional spectral analysis methods, all data are prepared beforehand and calculations are carried out using these data. In our proposed method, spectrum is updated whenever the new signal data comes in. We show that the amount of calculation takes a remarkable reduction and it realizes real time spectral analysis. Finally, we show the vocal sounds analysis using the proposed method.
  • 柳本 豪一, 大松 繁
    2006 年 126 巻 3 号 p. 389-394
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    In this paper we propose a user profile creation method using the Kullback Leibler divergence. To cope with information flood, many information filtering systems have been developed up to now. In the information filtering systems it is important to create a user profile which represents user's interests correctly. Since almost all information filtering systems are developed with techniques of information retrieval, machine learning, and pattern recognition, they often use a linear function as a discriminant function. To classify information in the field of document classification more precisely, the systems have been reported which use a non-linear function as a discriminant function. The proposed method is to use the Kullback Leibler divergence as a discriminant function which denotes to user's interest in the information filtering system. To identify an optimal discriminat function with documents which a user evaluates, we use the real-coded genetic algorithm. We compare the present method with the other one using a linear discriminant function and confirm the effectiveness of the proposing method.
  • 柳本 豪一, 大松 繁
    2006 年 126 巻 3 号 p. 395-400
    発行日: 2006年
    公開日: 2006/06/01
    ジャーナル フリー
    In this paper, we propose interest extraction using the relevance feedback with the kernel method. In the field of machine learning, the kernel method has been used. Since the classifier using the kernel method creates a discriminant function in a feature space, the discriminant function is a nonlinear function in a input space. The kernel method is used for the Support Vector Machine (SVM), the Kernel PCA, and so on. The SVM set a discriminant hyperplane between positive data and negative data. Hence, a distance between the hyperplane and a training sample is not important in the SVM. It is difficult to use the SVM to score other samples. Our goal is to create a method which scores the other samples in the feature space. We propose the relevance feedback which is carried out in the feature space. Hence, this relevance feedback can deal with nonlinearity of data. We compare the proposed method with the common relevance feedback using test collection NTCIR2. Finally, we comfirm the proposed method is superior to the common method through simulations.
研究開発レター
<マルチメディア>
<音声画像処理・認識>
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