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학생들의 경제사고방식을 바꾸는 순수이론에 관한 경제수업
( Hisashi Kurihara ) 순천향대학교 사회과학연구소 2009 사회과학연구 Vol.15 No.2
고교생들은 일상적 삶 속에서 경제현상에 대한 단순한 이론을 인식한다, 그들은 순진한 이론을 가지고 경제학 강좌를 듣는다. 교사는 학생들에게 경제적 사고를 가르치지만 순수이론이 학생들에게 밀착되어 있기 때문에 교사의 설명만으로 순진한 경제학을 합리적인 경제적 사고로 유연하게 바꾸는 것이 쉽지 않다. 그래서 저자는 "산속의 숙소에서 판매되는 캔 주스가 왜 비싼가"라는 주요 질문으로 경제학 강좌를 개발시켰다. 이 강의에서 교사는 학생들이 경제적 현상에 대한 순수이론을 말로써 표현하도록 하고 또 인식론적 갈등을 가지도록 하였다. 일본에서는 경제에 관한 학생의 순진한 이해에 관한 연구가 많지 않다. 그래서 교실에서 효과적으로 경제적 사고를 가르치기 위해 더 많은 연구가 필요하다. Junior and senior high-school students construct their naive theories on economic phenomena in daily life. They attend economics classes with naive theories in their mind. Teachers teach the economic way of thinking to their students. But, generally, because the naive theories adhere closely to students, it is not easy to change their naive economics into the rational economic way of thinking smoothly by teachers` explanation. So, Kurihara developed an economics class with a main question that "why are canned juices sold in mountain lodges are expensive." In this class, teachers made students verbalize their naive theories on economic phenomena and have epistemic conflicts. In Japan, there are not so many researches about students` naive understanding on economy. Therefore, we need to conduct further researches to teach the economic way of thinking effectively in classes.
Detection of Hotspots on Spatial Data Using Principal Component Analysis
Koji Kurihara,문승호,Fumio Ishioka 한국자료분석학회 2006 Journal of the Korean Data Analysis Society Vol.8 No.2
Echelon analysis(Myers et al., 1997) is a method to investigate the phase-structure of spatial data systematically and objectively. This method is also useful to prospect the areas of interest in regional monitoring of a surface variable. The spatial scan statistic(Kulldorff, 1997) is a method of detection and inference for the zones of significantly high and low rates based on the likelihood ratio. These zones are called hotspots. Kurihara and Hong(2002) detected the hotspots area for geospatial lattice data based on the echelon analysis. This method is valid for the detection of univariate lattice data. With our approach, we can detect hotspots area for multivariate lattice data. The present paper takes an approach to echelon based on the spatial scan statistics and data reduction method such as principal component analysis(PCA). We apply this method to epidemiological data concerning some causes of death. We will attempt to investigate whether there exist the regional differences in mortality ratio for each cause or not, and if there are regional difference in each cause, we find which area is high mortality ratio or low mortality ratio.
Stand-Alone Pico-Hydro Generation System using a High-Efficiency IPM Synchronous Generator
Kurihara, Kazumi,Kubota, Tomotsugu Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.2
This paper presents a successful stand-alone pico-hydro generation system using a high-efficiency interior permanent-magnet (IPM) synchronous generator. A 1-kW 4-pole V-type IPM generator with low voltage regulation is used for laboratory test in stand-alone hydro energy conversion system. It has been found from experimental results that the constant output voltage is supplied stably by the proposed system under wide speed range.
APPLICATION OF WHOLE BODY COUNTER TO NEUTRON DOSE ASSESSMENT IN CRITICALITY ACCIDENTS
Kurihara, O.,Tsujimura, N.,Takasaki, K.,Momose, T.,Maruo, Y. 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
Neutron dose assessment in criticality accidents using Whole Body Counter(WBC) was proved to be an effective method as rapid neutron dose estimation at the JCO criticality acciedent in Tokai-mura. The 1.36MeV gamma-ray of 24Na in a body can be detected easily by a germanium detector. The minimum Detectable Activity(MDA) of 24Na is approximately 50Bq for 10miniute measurement by the germanium-type whole body counter at JNC Tokai Works. Neutron energy spectra at the typical shielding conditions in criticality accidents were calculated and the conversion factor, whole body activity-to-organ mass weighted neutron absorbed dose, corresponding to each condition were determined. The conversion factor for uncollied fission spectrum is 7.7[(Bq24Na/g23Na)/mGy].
Naoto Kurihara,Kunhua Fan,Howard T. Thaler,Kan Yang,Martin Lipkin 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.2
We previously reported hyperproliferation and hyperplasia in C57Bl/6 mouse mammary gland after feeding aWestern-style diet (WD); these findings decreased after supplementing WD with increased calcium and vitamin D3. We nowagain fortified WD with increased calcium and vitamin D3 from two sources: (1) a food source, calcium- and vitamin D3-en-riched yogurt (WDy diet) or (2) adding calcium and vitamin D3 directly to WD (WDCaD diet). After 6 months of feeding thenumber of mammary ducts was higher in mice consuming WD compared to WDy (216.0 vs. 202.7, P. .05) and WDCaD(216.0 vs. 194.9, P. .001). The percentage of small ducts increased in WD compared to AIN-76A controls (23.3% vs. 17.4%)but was lower in the WDy (17.1%) and WDCaD (14.8%) groups. WD mice had higher numbers of epithelial cells per ductthan WDy (33.2 vs. 27.4, P. .001) and WDCaD (33.2 vs. 27.8, P. .001) mice, and AIN-76A-fed mice had higher numbersthan WDy (31.1 vs. 27.4, P. .005) or WDCaD (31.1 vs. 27.8, P. .01) mice. Mitotic index was higher in WD than in WDCaD mice (0.0020 vs. 0.0009, P. .001). Thus, small mammary gland ductules and mitosis increased after feeding WDand decreased after supplementing the diets with increased calcium and vitamin D3, administered either in a dairy food (yo-gurt) or directly as calcium carbonate plus vitamin D3 in WD, suggesting further study of these nutrients for their possiblerelationship to breast cancer prevention.