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113 巻, 5 号
選択された号の論文の12件中1～12を表示しています
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小林 哲則1993 年 113 巻 5 号 p. 295-301
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (841K) -
英保 茂, 関口 博之1993 年 113 巻 5 号 p. 302-308
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (3708K) -
小林 吉久, 二瓶 靖厚, 水本 潤一, 佐藤 孝, 榛葉 實1993 年 113 巻 5 号 p. 309-314
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーWe stabilized the oscillation frequency of a semiconductor laser under direct FSK. The frequency stabilization of a semiconductor laser under direct FSK is difficult because of its unavoidable sideband spectra. Therefore, we have devised the peak-hold method and improved the frequency stability under direct FSK. However, a direct rectangular wave modulation of the injection current of a semiconductor laser does not provide the complete FSK in some modulation frequencies because of the frequency chirping effect. Therefore, we modified the rectangular wave modulation and obtained the better FSK signal. We also report this better FSK signal improves both the frequency stability and frequency deviation.抄録全体を表示PDF形式でダウンロード (2956K) -
Kazuhisa Matsuo, Takehiko Tomikawa, Mamoru Nakajima1993 年 113 巻 5 号 p. 315-321
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーThis paper describes an observation with use of pulse laser of behavior in detail of electrostatically extracted ink jet flight. In this trial, we have learned that randomly or asynchronously flying corpuscles can be photographed simultaneously by pulse laser in a bright field scattering image. An application of is also described with respect to continuous tone reproduction. Both cylindrical thread and flying corpuscles of ink jet are utilized in combination through a single outlet nozzle. The former is useful for higher density plottings and the latter for lower density plottings. Such a phenomenon of having plural states in the liquid stream is peculiar to the electrostatically extracted ink jet using dielectric ink.抄録全体を表示PDF形式でダウンロード (3422K) -
川守田 聰, 原 和裕1993 年 113 巻 5 号 p. 322-328
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーA new current sensor was studied. This sensor was designed to measure a large ac current without magnetic cores; it was composed of several units including Hall ICs, coils, and some electronic circuits. The Hall ICs were placed around a current to be measured, detecting the magnetic field generated partly by the measured current and partly by the coil current. The coil current was controlled with a feedback scheme so that the magnetic field generated by the coil current cancelled the field by the measured current. The coil current was converted to an output voltage with a resistor.
As the sensor operation was based on a zero method, the sensor made possible accurate measurements of currents; it was stable irrespective of ambient temperature. And it detected a wide frequency range of currents. Further it was safe and stable regardless of excess currents. It had also an advantage in cost compared to optical-fiber current transformers because it did not need expensive components.抄録全体を表示PDF形式でダウンロード (869K) -
岡山 努1993 年 113 巻 5 号 p. 329-337
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーMicroprocessor signal processing is currently incorporated intensively into industrial two wire transmitters. Transmitters are used outdoors under severe environmental conditions. Intelligent transmitters are, therefore, required to have higher accuracy, signal-noise ratio, and temperature stability than those of conventional analog transmitters to satisfy users' expectations.
The key element of an intelligent transmitter is the analog input signal processing including the A/D conversion. Under constraint of low power consumption and single power supply, a direct digital conversion circuit of difference between resistance ratios is developped. The new circuit is achieved by combining both dual slope integrating method and constant voltage driving method of resistive sensor.
This circuit is very stable because it depends only on the stabilities of resistance ratios and on short-term stabilities of electronic parts.
This direct signal processing scheme has been implemented to a mass-produced differential pressure transmitter of Si diaphragm type, and good performances with low temperature co-efficient of 50ppm/°C and high accuracy of 0.1% of full scale.抄録全体を表示PDF形式でダウンロード (1214K) -
西田 眞, 林 建輔, 吉村 昇, 大塚 敬1993 年 113 巻 5 号 p. 338-346
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーThis paper proposes a new fuzzy estimation method for the category mixture rate in the mixed pixel (mixel) of the boundary area of the satellite image. The distribution of the training date is handled by a fuzzy set, and the category mixture rate in the mixel is estimated by the fuzzy inference. The proposed method, therefore, takes into consideration the scattering of the training data in the membership function.
The estimation results with the proposed method show more than 79% of the accuracy and 0.119_??_0.003 of the total RMS (rool mean square) error for the mixels which are composed with the mean value of the each pure pixel. Moreover, the estimation results with the proposed method show 73_??_83% of the accuracy and 0.139_??_0.094 of the total RMS error for mixls which are produced by random sampling from the distribution of the pure pixels. These results indicate that the proposed method is able to estimate accurately the category mixture rate in mixels. It is also confirmed that the proposed method is able to estimate accurately the category mixture rate for the mixels of the actual satellite image. Therefore, it is indicated that the proposed method is the effective technique to estimate the category mixture rate of the mixels.抄録全体を表示PDF形式でダウンロード (2022K) -
坂本 哲野, 兼堀 正史, 竹上 喜紳, 山本 達夫, 中込 真二1993 年 113 巻 5 号 p. 347-352
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーThis paper describes reliability of a capacitive humidity sensor based on the moisture sensitivity of polyimide. The sensor consists of a simple polyimide capacitor structure fabricated directly on Si substrate which is used as a lower electrode. Polyimide layer was coated with spinner by the thickness of about 1.2μm, and then a comb-shaped upper Au electrode was attached on it, which was about 10nm in thickness. Moreover, another type of polyimide layer was formed on the top surface as a protective one.
In order to improve the sensitivity and stability characteristics, the mixing of two different kinds of polyimide resin was considered. As a function of the polyimide mixing ratio, the sensitivity for humidity variation and the durability for high temperature and high humidity conditions were studied.
Characteristics of the sensor such as sensitivity, linearity, hysteresis, response time and durability were evaluated. The durability has been examined in various extreme environment such as high temperature, high humidity, temperature cycles and wetting cycles with dew. Long-term stability was typically less than 5%RH.抄録全体を表示PDF形式でダウンロード (1138K) -
佐藤 光男, 竹田 宏, 冨澤 尚己, 今村 政道, 酒井 明彦1993 年 113 巻 5 号 p. 353-361
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーIn this paper, we consider the problems of recognizing road circumstances of a vehicle and analyzing driver's intention based on information obtained from some sensors attached to the vehicle. For these problems, first we show that it is sufficiently possible to identify the circumstances and it is possible to some extent to identify intention by using a number of feature extraction variables which are made by appropriate feature extraction, e. g. averaging or counting during a certain period, from measurement data of the sensors. Then, based on this consideration, we present two kinds of algorithms. One makes the identification by Mahalanobis' generalized distance on a vector space generated from the feature extraction variables, and the other by fuzzy reasoning with using membership functions, each of which is made for each feature extraction variable. By applying these algorithms to actual sensor measurement data, we show that they provide a success rate of more than 90% concerning recognition of road circumstances and a success rate of more than 70% concerning analysis of some driver's intention.抄録全体を表示PDF形式でダウンロード (1497K) -
大成 幹彦, 塩谷 真, 志田 正実1993 年 113 巻 5 号 p. 362-363
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (795K) -
三澤 顕次, 有澤 準二1993 年 113 巻 5 号 p. 364-365
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (789K) -
須崎 健一, 荒屋 眞二, 中村 良三1993 年 113 巻 5 号 p. 366-367
発行日: 1993/05/20
公開日: 2008/12/19
ジャーナル フリーPDF形式でダウンロード (161K)
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