著者
柴田 長吉郎 玉井 秀昭 田中 勤 若松 求
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) (ISSN:03854221)
巻号頁・発行日
vol.110, no.6, pp.370-375, 1990-06-20 (Released:2008-12-19)
参考文献数
3

In accordance with rapid increase of industrial microwave application on heating, more and more high power microwave sources are required. Among many microwave devices, magnetron is most advantageous in economical point of view. Responding to these requirements, a super high power magnetron with output power of 420kW in CW which will be the largest in the world at this time, objective power being 500kW, was developed. In this paper, the design principle, the construction and the scale of each parts are described. The measured characteristics of the developed device reveal satisfactory.
著者
山辺 智晃 片岡 裕雄 中村 明生
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) (ISSN:03854221)
巻号頁・発行日
vol.135, no.4, pp.372-380, 2015 (Released:2015-04-01)
参考文献数
20

We propose quantized feature with angular displacement for pose-based activity recognition. We calculate a 3D joint angle from three postural coordinates. The angular displacement should be quantized since joint angle includes errors due to system noises and similar posture. To investigate appropriate features, we propose four kinds of quantization levels; binarization, ternarization, quaternarization, and quinarization. We apply quantized features in order to improve pose-based activity recognition with the UTKinect-Action Dataset. In the experiment, we show the appropriate feature for activity recognition. As the result, the ternarized feature achieves the highest recognition rate in average. The recognition rate of trials with ternarized feature is improved 2.4% to one with no-quantized feature, and 1.8% to conventional method.
著者
美多 勉 平田 光男 村田 健一
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) (ISSN:03854221)
巻号頁・発行日
vol.115, no.8, pp.1002-1011, 1995-07-20 (Released:2008-12-19)
参考文献数
9
被引用文献数
3 10

This paper reviews a disturbance canceling control based on a disturbance observer from the view point of servo controllers and gives several new points of this control methodology. Especially, the extended H∞ control, previously proposed by authors, is proven to be a special type of such a disturbance canceling controller which has an ability to shape the frequency response of the complementary sensitivity function.
著者
大塚 元太 袖山 和久 吉田 知史 村中 徳明 今西 茂
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) (ISSN:03854221)
巻号頁・発行日
vol.116, no.11, pp.1288-1294, 1996-10-20 (Released:2008-12-19)
参考文献数
10
被引用文献数
2 3

Today, the technique of virtual reality has become popular in various fields because of its technical progress. We focused on ‘presence’ - one of the three elements of virtual reality, and constructed a simple supporting system for piano education. The virtual world and the real world are overlapped by showing the visual information in this system. The purpose of this system is to use the realistic virtual image as an interface (or tool) of education.The unity of the virtual image and the reality has been done with standing pictures by using, for example, ‘See-through HMD’. In this research, however, we overlapped the virtual image and the real world with moving pictures. The overlapping is accomplished not by using HMD, but by using a half mirror. The virtual hands can automatically play a tune from a score so that learners can choose what they like without instructors. This is one example of the system which has a proven effectiveness.
著者
阿部 重夫
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) (ISSN:03854221)
巻号頁・発行日
vol.125, no.1, pp.1-6, 2005 (Released:2005-04-01)
参考文献数
9

It is wrong to consider that the more difficult the papers are, the more valuable. We should write a paper in a top-down manner, starting from the central idea that explains the originality of the paper down to the details.In the abstract, we should state the originality, the new approach, and the contribution of the paper. In the introduction, we should explain the problems of the previous work citing references and explain what is the originality of the paper and how to solve the problems in a new way. In the body of the paper, we should discuss the idea more elaborately, if possible, using figures and then move to the details. In the conclusions, we should state the method and contribution clearly.In presenting a paper, we should explain the idea by figures not resorting to mathematical equations.
著者
梶原 朋也 佐藤 勝 武山 真弓
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) (ISSN:03854221)
巻号頁・発行日
vol.142, no.7, pp.735-736, 2022-07-01 (Released:2022-07-01)
参考文献数
10

We aimed to evaluate the aging and deterioration of Japanese sake by its electrical properties. The time dependence of Japanese sake after opening the package was electrically measured. As a results, Japanese sake preserved in an environment that does not easily deteriorate tended to have little change in electrical properties.
著者
山下 和彦 野本 洋平 梅沢 淳 宮川 晴妃 川澄 正史 小山 裕徳 斎藤 正男
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) (ISSN:03854221)
巻号頁・発行日
vol.124, no.10, pp.2057-2063, 2004 (Released:2005-01-01)
参考文献数
25
被引用文献数
2 2

There is the increasing concern of the society to prevent the tumbling of the aged. The study of the static, as well as dynamic aspects, such as the muscular strength of the lower-limb and the postural stability, should be developed, especially from the viewpoint of the aged. This paper focuses on the external observation of the foot and toenail, as being correlated to the physical functions of the lower-limb against tumbling. The lower-limb functions are evaluated in terms of the 10 m walking time, the toe-gap force and single-foot standing period. The correlation to the personal tumbling experiences is also examined. It is seen that the groups, which exhibit external abnormalities in the foot and the toenail, generally decline in the muscular strength and postural stability. They also have more frequent tumbling experiences and express in their concern of the danger of tumbling. It seems that those shapes abnormalities can indicate, to some extent, the tumbling danger of the aged.
著者
Tomohiro Murase Kosuke Oiwa Akio Nozawa
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) (ISSN:03854221)
巻号頁・発行日
vol.138, no.9, pp.1148-1153, 2018-09-01 (Released:2018-09-01)
参考文献数
22
被引用文献数
2

In automated driving at Level 3, drivers constantly need to allocate attention to the driving environment to react immediately to a take-over request. However, the amount of attention of drivers to the driving environment has not been quantified. The objective of this study was a quantitative evaluation of the amount of attention to the driving environment, and the psychophysiological state of the driver, during automated driving at Level 3. Attention and driver state at Level 3 were evaluated using ERP and psychophysiological indices respectively with compared to Level 2. The dual task method was used, in which twelve subjects performed driving tasks (Level 2 and Level 3) on a driving simulation system while in parallel performing an auditory oddball task. The data showed that the amount of attention to the driving environment at Level 3 decreased in comparison to Level 2, as indirectly measured by a 19.2% increase in attention to the auditory oddball task. Sympathetic nervous system activity during Level 3 automated driving decreased as compared to Level 2. In the psychological state, comfortable feeling and arousal level decreased at Level 3.
著者
Genki Kato Kosuke Oiwa Tatsuya Iwaki Tomoharu Ishikawa Akio Nozawa
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) (ISSN:03854221)
巻号頁・発行日
vol.138, no.7, pp.805-811, 2018-07-01 (Released:2018-07-01)
参考文献数
20
被引用文献数
1

Selfies may have an effect on the psychophysiological state. The objective of the present study was to evaluate the psychophysiological state by providing feedback for selfies. The effect of the time period was also investigated. The period from the date a selfie was taken to the experiment date was configured as 2 conditions: a Short period (1-40 days) and a Long period (41-80 days). In this study, the evocation of emotions was attempted by providing feedback for four types of selfie 1: good face, 2: bad face, 3: good psychological state, and 4: bad psychological state. “Comfort emotion”, “Like emotion”, and “Awareness” significantly increased when providing feedback for a selfie evaluated as having a good face and a good psychological state. The experimental results using two-way analysis of variance revealed that the physiological state was not affected by the time period, but the psychological state was affected by the time period. The combination of (Positive Face Evaluation) × (Long period) selfies had more positive effect on “Awareness”.
著者
Hiroki Ito Shizuka Bando Kosuke Oiwa Akio Nozawa
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) (ISSN:03854221)
巻号頁・発行日
vol.138, no.7, pp.812-821, 2018-07-01 (Released:2018-07-01)
参考文献数
39
被引用文献数
1

An imbalance of the circadian rhythm due to an irregular lifestyle leads to autonomic dystonia. The long-hour variations of the physiological indices such as core temperature and heart rate variability, associated with the autonomic nervous activity, have been focused. Additionally, the relationships between these physiological indices and facial skin temperature have been reported. The objective of this study is to identify the day-long variable components of facial thermal images (FTIs) to evaluate the corresponding variations of autonomic nervous activity by non-contact measurement. In this study, the measured FTIs were subjected to independent component analysis (ICA). Additionally, multiple regression analysis was performed to estimate the relationships between independent components, extracted from FTIs, and other psychophysiological indices, associated with autonomic nervous activity. As a result, the facial day-long variable components, representing the reproducible rhythm through multiple days, were identified by applying ICA to several different combinations of FTIs. Moreover, these components were associated with the axillary temperature. Therefore, the long-period variations, associated with autonomic nervous activity, could be evaluated from the facial skin temperature.
著者
Kosuke Oiwa Shizuka Bando Akio Nozawa
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) (ISSN:03854221)
巻号頁・発行日
vol.138, no.7, pp.783-789, 2018-07-01 (Released:2018-07-01)
参考文献数
36

Hypertension is one of the leading risk factors for cerebrovascular, cardiovascular, and chronic kidney diseases. Regular measurement and monitoring of blood pressure is important to decrease or prevent pathogenesis of diseases. Contactless measurement of blood pressure using a smartphone application, can enable regular monitoring. The objective of this study is to construct a system which can monitor blood pressure anytime and anywhere. In this study, contactless blood pressure assessment was attempted, using facial visible image analysis and created individual models for blood pressure estimation. Variation in brightness of the skin color was obtained from facial visible images and applied to independent component analysis, which is one of the blind source separation methods to extract the facial photoplethysmogram (PPG) component using a proposed system. Amplitude and phase of facial PPG component were used as indices for blood pressure. A correlation analysis between facial PPG component and blood pressure was performed and created individual models for blood pressure estimation.
著者
村上 龍希 景山 陽一 西田 眞 白澤 洋一
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) (ISSN:03854221)
巻号頁・発行日
vol.133, no.11, pp.2098-2109, 2013-11-01 (Released:2013-11-01)
参考文献数
24

In the selection of portraits for ID and a profile, it is useful to retrieve high quality facial images from a lot of portraits. In addition, overexposure may give a negative impact on us because overexposed facial parts look unnaturally white; therefore the recognition for qualitative meaning of overexposure is important for retrieval of high quality facial images. To get qualitative meaning by a image analysis method that can evaluate images quantitatively, it needs a quasi-quantitative evaluation method that can use an index of quantitative evaluation having qualitative meaning. In this paper, we investigated the index for quasi-quantitative estimation of overexposure in the facial image on the basis of the heuristic assumptions, and defined the index as the overexposure intensity (OI). We developed an algorithm with Support Vector Machine (SVM) for judging the OI. The results of experiment conducted with 11 evaluators for analyzing images suggest that the proposed method can retrieve a facial image for ID and the profile with an F-measure of 96.2%.
著者
張 暁林 若松 秀俊
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) (ISSN:03854221)
巻号頁・発行日
vol.119, no.5, pp.539-544, 1999-05-01 (Released:2008-12-19)
参考文献数
3

New equivalent circuits of neuron, different from the equivalent circuit of Hodgkin-Huxley, are proposed. In these circuits, ion-condensers are a concept to represent the equilibrium potential of ions, and power sources to represent ion-pumps. Uning these equivalent circuits, we derive the equations which relate the resting membrane potential with capacity of the ion-pumps, intracellular impermeant anions concentrations, extracellular ions concentrations and permeability of ions transported by the ion-pumps. Using these equations, we elaluate the effect of presence of intracellular impermeant anions on the resting membrane potential
著者
Satoru Kikuchi Kazuhiko Hamamoto
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) (ISSN:03854221)
巻号頁・発行日
vol.136, no.7, pp.995-1000, 2016-07-01 (Released:2016-07-01)
参考文献数
10

In the study reported in this paper, we investigated the relationship between a schema and applied programming skills in computer programming education. A schema is a cognitive structure that is gained from experience, and it is assumed to affect an applied skill. The experiment in the present study comprised eight writing tasks and 45 reading tasks, and was designed to investigate three issues: (1) the details of a schema (i.e., knowledge related to program writing skills), (2) the relationship between a schema and applied skills, and (3) the differences between a schema and fragile knowledge. The results show that the group with high writing scores showed advanced applied skills, and there was certain common knowledge in the group with high writing scores that may reflect a programming schema. These results suggest that a teaching method designed to increase the experience of various programming codes through a large number of examples may be effective, with those codes slightly different from each other in order to create a programming schema.
著者
大川 勉 上西 司 平林 秀一 鈴木 亮 三井 浩康 小泉 寿男
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) (ISSN:03854221)
巻号頁・発行日
vol.129, no.9, pp.1747-1758, 2009-09-01 (Released:2009-09-01)
参考文献数
21

The business in the enterprise is closely related with the information system to such an extent that the business activities are difficult without the information system. The system design technique that considers the business process well, and that enables a quick system development is requested. In addition, the demand for the development cost is also severe than before. To cope with the current situation, the modeling technology named BPM(Business Process Management/Modeling)is drawing attention and becoming important as a key technology. BPM is a technology to model business activities as business processes and visualize them to improve the business efficiency. However, a general methodology to develop the information system using the analysis result of BPM doesn't exist, and a few development cases are reported. This paper proposes an information system development method combining business process modeling with executable modeling. In this paper we describe a guideline to support consistency of development and development efficiency and the framework enabling to develop the information system from model. We have prototyped the information system with the proposed method and our experience has shown that the methodology is valuable.