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Live Exhibitions in the Classroom with Mathematical Software
( Hamada Tatsuyoshi ) 한국수학교육학회 2012 수학교육 학술지 Vol.2012 No.2
Generally, we have “Intensive Course” for undergraduate and graduate students in any universities in Japan. We give credit hours with lectures of four or five days and reports. For students, it is a good system for getting new knowledge from professors of different universities intensively. In this article, I want to describe my experiences of intensive courses with mathematical software and the effectiveness of the live exhibitions in the classroom.
Robust Digital Control of a Broadband PWM Power Amplifier
Nobutaka Suzuki,Kohji Higuchi,Tatsuyoshi Kajikawa 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Lately, it is required that a PWM power amplifier has a wide bandwidth and good robustness. For example, it is in application of a testing power supply of a low ferquency immunity examination, or a class-D ampllifier. In this paper, we show that the bandwidth of PWM power amplifier can be extended and the good robustnes can be attained by using an approximate 2-degree-of-freedom(2DOF) digital controller. This controller is implemented on a DSP. It is demonstrated from experiments that the broadband and robust PWM power amplifier can be realized with this controller.
The Spite Dilemma Experiment in Korea
Youngsub Chun,Jeongbin Kim,Tatsuyoshi Saijo 서울대학교 경제연구소 2011 Seoul journal of economics Vol.24 No.1
This paper investigates a choice behavior of Korean subjects for the provision of public goods using the voluntary contribution mechanism in Saijo and Nakamura (1995). Together with the data from Saijo and Nakamura (1995) and Saijo et al. (2007), we conclude that whereas Japanese subjects are more likely to behave spitefully, Korean and Chinese subjects are more likely to act cooperatively. We also analyze the behavior of Korean subjects after being categorized by department. Subjects from the economics department follow a pattern of a contribution not much different from the theoretical expectation, and subjects from the college of social sciences show a similar pattern. The subjects who act spitefully are from the department of agricultural economics.
Parameter Determining Method of Robust Digital Controller for PWM Power Amplier
Tokubai Ki,Kohji HIGUCHI,Kazushi NAKANO,Tatsuyoshi KAJIKAWA,Satoshi YOSHIZAWA,Koji MATSUSHITA,Fumiho CHINO 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper a parameter determing method of digital controller is proposed for spreading capacitance load range more and improving transient charateristics for inductance load. In the previous proposed controller, the conguration of the controller is the same to all loads. At inductive load, there is a possibility that the transient characteristics may become bad and the specication may not be satised. Therefore, a load currentis estimated at inductive load, and the controller which also uses load cur-rent for feedback is congured. ADSP is implemented to this digital controller. It is demonstrated from experiments that the digital controller of which parameters are deter-mined by the proposed method satises the given speci-cations.