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Ikegami, Kozo,Shirasawa, Yo,Yokotsuka, Tomohito,Niitsu Yasushi 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.4
Cyclic plastic deformation of stainless steel SUS 304 is experimentally investigated at low temperature of liquid nitrogen (77 K) under various cyclic loading conditions. Thin walled tubular specimens are subjected to cyclic loading under constant strain ranges. At low temperature, the material shows remarkable hardening by cyclic loading comparing with cyclic loading at room temperature. The hysteresis curves of stress-strain relations by cyclic loading are saturated by increasing the cycle numbers. The saturation tendency depends on loading direction. The saturated stress values are related with cumulative plastic strain of cyclic loading. The prestraining is given at 77 K by axial and torsional loadings, and subsequent cyclic loading under constant strain range is conducted at 77 K. The cyclic stress-strain curves are saturated by increasing cyclic numbers. At small cyclic numbers, cyclic plastic deformation depends on the prestrain direction. The directional effect of pre-strain on cyclic loading becomes small with increasing number of cycles.
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Senjyu, Tomonobu,Shirasawa, Tomiyuki,Uezato, Katsumi The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point. To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell. The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
TOPOGRAPHICAL FEATURE REPRESENTATION BY OPENNESS MAPS
Yokoyama, Ryuzo,Shirasawa, Michio,Kikuchi, Yuu 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
Two concepts of overground openness and underground openness within a distance L are defined to a grid point on a digital elevation model (DEM). The farmer is a measure of sky extent over the point, and the later is of earth extent under. Those openness maps effectively represent convex and concave features of topography, and are conveniently applied to geomorphological and geological interpretation.
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Tomonobu Senjyu,Tomiyuki Shirasawa,Katsumi Uezato 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point To overcome this problem, we have developed an algorithm that will estimate the duty ratio corresponding to maximum power operation of solar cell The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum. For the estimation, we have used the well know Lagrange's interpolation method. This method can track maximum power point quickly even for changing solar isolation and avoids oscillations after reaching the maximum power point.
A Maximum Power Point Tracking Control for Photovoltaic Array without Voltage Sensor
Tomonobu Senjyu,Tomiyuki Shirasawa,Katsumi Uezato 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a maximum power point tracking algorithm for Photovoltaic array using only instantaneous output current information. The conventional Hill climbing method of peak power tracking has a disadvantage of oscillations about the maximum power point. To overcome this problem, we have developed a algorithm, that will estimate the duty ratio corresponding to maximum power operation of solar cell The estimation of the optimal duty ratio involves, finding the duty ratio at which integral value of output current is maximum For the estimation, we have used the well know Lagrange's interpolation method This method can track maximum power point quickly even for changing solar insolations and avoids oscillations after reaching the maximum power point.<br/>
소진이(JinYi So),Shinichi Okada, Masakazu Shirasawa 한국노년학회 2006 한국노년학 Vol.26 No.4
본 연구의 목적은 특별양호노인홈 개호직원의 일의 유능감에 초점을 맞추어, 그 구조를 명확히 하고, 인간관계 및 전문직의 내적 동기부여와의 관계를 검증하는 것이다. 검증하고자 하는 인과모델은 내적 동기부여이론에 관한 선행연구를 참고로 작성하였다. 또한 개호직원의 일의 유능감은 선행 연구를 검토 하여 직접 척도를 작성하고, 개념구성 타당성을 검증하였다. 인간관계에 대해서는 이용자의 관계와 직장 내 인관관계에 초점을 맞추고, 전문직의 내적 동기부여에 대해서는 내적으로 동기가 부여 되었을 때의 감정을 나타내는 지표로서 일의 자긍심과 일의 즐거움을 사용하였다. 조사 대상은 일본의 특별양호노인홈의 개호직원 400명이고, 조사방법은 횡단적 조사이며, 자기기입식 질문지를 사용하여 우편조사를 실시하였다. 유효회수율은 53.3%였다. 분석방법은 일의 유능감의 척도에 대해서 확증적 인자분석을 실시하였고, 인과모델의 검증을 위해서 구조방정식 모델링을 사용하여 검증하였다. 분석결과, 일의 유능감 척도의 개념구성타당성이 확인 되었으며, 개념상의 일차원성을 충분히 갖추고 있었다. 또한 인과모델의 검증 결과, 개호직원의 인간관계가 일의 유능감을 규정하고, 일의 유능감이 일의 자긍심과 즐거움을 규정하는 인과의 방향성이 통계학적으로 검증되었다. 특히 인간관계는 일의 유능감에 대하여 58%의 높은 설명력을 가지고 있는 것으로 나타나, 이용자와의 신뢰적인 관계와 직장 내 상사 및 동료와의 협력적인 관계가 기반이 되어야 업무 수행에 있어서 충분히 능력을 발휘하고 성장해 나갈 수 있으며, 그로 인해 전문직으로서의 자긍심과 즐거움이 동반된다고 해석할 수 있겠다. 이상의 결과로부터 긍정적인 인간관계를 조성하고 유지하는 것이 일의 유능감을 통한 성장과 능력개발에 관한 의욕을 높이고, 전문직의 내적 동기부여를 높이기 위한 하나의 유효한 방법이라는 증거를 얻을 수 있었다. 이는 2008년도부터 공적 장기요양보장제도를 도입할 예정인 한국의 케어 복지현장에 있어서 질 높은 케어서비스의 확보 방안을 검토하는데 있어서 시사하는 바가 크다고 본다. The object of the research is to examine the relationship between perceived job competence and interpersonal relationships of the care workers as well as to identify the effects of professional intrinsic motivation of such work. The verified causal models in the current study are based on the intrinsic motivation theory. The sample size was 400 care workers in Japanese nursing homes selected by the random sampling. The research design was a cross-sectional survey by using self-administered questionnaires. The response rate was 53.3%(N=213). For the methods of analysis, confirmatory factor analysis for the scale of perceived job competence was performed and for the confirmation of the causal model, a structural equation modeling(SEM) was used. As a result, construct validity of the perceived job competence was confirmed in the present study. In addition, the causal model is statistically supported that the interpersonal relationships of care worker improves the perceived job competence and promotes work self-confidence and enjoyment of workers. The findings imply the mechanism between perceived job competence and job motivation has become clear. We could get evidence that creating positive interpersonal relationships and maintaining it is an effective way to enhance care worker to develop one's ability through perceived job competence as well as providing intrinsic motivation.