著者

大豆生田 利章

出版者

独立行政法人 国立高等専門学校機構群馬工業高等専門学校

雑誌

群馬高専レビュー (ISSN:02886936)

巻号頁・発行日

vol.40, pp.59-64, 2022 (Released:2022-03-25)

参考文献数

7

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In this report it is investigated if the difference in gender of avatars used in virtual space affect the personality of the user and what kind of impact it would have. As a result it is possible to make a hypothesis that "if the gender in the real space and the gender of the avatar in the VR space are different, the user will be affected."

著者

大豆生田 利章

出版者

独立行政法人 国立高等専門学校機構群馬工業高等専門学校

雑誌

群馬高専レビュー (ISSN:02886936)

巻号頁・発行日

vol.40, pp.51-58, 2022 (Released:2022-03-25)

参考文献数

35

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The energy level called Fermi level is an important concept in solid-state physics and electronic device engineering. However, terms, symbols, and explanations are different in various documents, and the descriptions are not always unified. In this report the descriptions for Fermi energy, Fermi level and chemical potential in books are investigated. As a result it is confirmed that there was confusion in the usage of these terms.

著者

大豆生田 利章

出版者

独立行政法人 国立高等専門学校機構群馬工業高等専門学校

雑誌

群馬高専レビュー (ISSN:02886936)

巻号頁・発行日

vol.28, pp.19-23, 2010-03-15 (Released:2022-03-01)

参考文献数

5

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The collector current of actual bipolar transistors in the satulated region increase with the collector voltage. This phenomenon is called the Early effect, and the voltage at which the expolated output curves of bipolar transistors is called the Early voltage. The Early voltgae is usually estimated using the Gummel-Poon model. However the Gummel-Poon model is a little difficult to learn for beginners. In this paper the estimation of the Early voltage using the Gumle-Poom model and that by Taur and Ning are shown. Then the estimation of the Early voltage using the elementary model by the author is shown, and the numerically calculated results are also shown. The estimation using the elementary model may be useful for the begginers to understand the behavior of bipolar transistors.

著者

大豆生田 利章

出版者

独立行政法人 国立高等専門学校機構群馬工業高等専門学校

雑誌

群馬高専レビュー (ISSN:02886936)

巻号頁・発行日

vol.38, pp.23-28, 2020-03-31 (Released:2022-03-16)

参考文献数

5

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In recent years, electric guitars have become an indispensable instrument in the world music scene. If an electric guitar is used, the timbre can be changed by passing through a circuit such as a filter at the electrical signal stage. In this way, effectors are widely used to change the timbre, and many professional musicians use a variety of effectors. When an amateur musician tries to copy the music of a professional musician, even if the same guitar or amp is prepared, the same timbre will not be achieved without the same effector. In addition, few musicians disclose the types and parameters of effectors, and the equipments are expensive. The reproduction of the timbre is done by trial and error based on experience and feeling by each musician. This is not an easy task for beginners. In this paper the timbre comparison methods is compared to easily reproduce the sound modulated by effectors. The methods evaluated in this paper are direct, FFT (fast Fourier transform), SFFT (short-time Fourier transform), MFCC (Mel-Frequency Cepstral Coefficients) and meta-MFCC. The effects evaluated in this paper are distortion, reverb and delay. Comparing the evaluation of characteristics calculate by a computer and that by human hearing, it is shown that distortion can estimate parameters with any characteristics accurately. The MFCC system was found to be good for three effects to reproduce the orginal parameters, especially SMFCC (short-time Mel-Frequency Cepstral Coefficients)and meta MFCC were found to be particularly good. The computational cost of the FFT system was reduced to about20 percent compared to the MFCC system. There was almost no difference in cost in the FFT or MFCC system. The time cost for the comparison was low in the FFT and MFCC systems, especially the FFT, MFCC, and meta MFCC. Therefore meta MFCC is considered to be optimal if the specific gravity is compared in order of the human auditory characteristics.