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Yasuhito Nakada,Hiroaki Takahashi,Kyoko Ichida,Takashi Minemoto,Hideyuki Takakura 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Influences of clearness index (Kt) and air mass (AM) on both the sunlight and the outdoor performance of photovoltaic (PV) modules were analyzed. The Kt and AM strongly affect the intensity of solar irradiation and spectral irradiance distribution. In this study, the impacts of Kt and AM on an index for spectral irradiance distribution of average photon energy (APE) are analyzed using a contour maps and then the impacts of the environmental factors on the outdoor performance of single crystalline Si (sc-Si) and amorphous Si (a-Si) PV modules is discussed. As the result, it was found that APE increases with decreasing the Kt and AM. Furthermore, it was found that the outdoor performance of a-Si PV modules strongly depended on APE compared to sc-Si PV modules. Thus, APE can be estimated from the contour map with the Kt and AM.
Important Points for Geo-risk Management on Civil Engineering Works in Japan
( Yasuhito Sasaki ),( Shuji Anan ),( Yoshinori Yajima ),( Ritsu Ueda ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Many geological accidents under construction have recently occurred on civil engineering projects in Japan. One of the most epoch making accidents was the giant sinkhole accident in Fukuoka city in 2016, induced by the collapse of a tunnel under construction. The tunnel has been excavated just several meters under the surface of unconformity between Paleogene sedimentary rocks and Quaternary deposits. Misunderstanding of geo-risk induced the accident; causative geological factors are the irregularity of the unconformity surface and the heterogeneity of the weathered and jointed rock mass. After that, Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) and the Public Works Research Institute (PWRI) have started to make new guidelines for geo-risk management on civil engineering works. We are now analyzing present geo-risk management systems of MLIT etc., and discussing improvement point of geo-risk management by the analysisi of trouble c ases. Important k ey words i n geo-risk management, we t emporarily c onsider, a re g eological uncertainty, likelihood of geo-risk, public geologists and geo-risk manager. Most important point is to develop the skill of engineering geologists for risk finding, risk assesment and risk communication. Especially, we need to develop new techniques for the evaluation, expression and communication of likelihood of geo-risk and geological uncertainty included in geological investigation results such as engineering geological maps, profiles. Next important point is the participation of engineering geologists through the project as a member of public engineers. Third point is the assignment of geo-risk manager in the project who controles geo-risk management procedure.
Machine-Readable Dictionary Headwords
( Yasuhito Tanaka ),( Kenji Kita ) 한국언어정보학회 1998 국제 워크샵 Vol.1998 No.-
Selecting headwords is an important problem in developing a dictionary. We have analyzed several machine-readable dictionaries and large volumes of corpora in our aim of developing an extensive machine-readable dictionary with one million headwords. This paper shows analysis and comparison of results and discusses how we collect, sort and allocate information to the dictionary headwords.
The Divergent Roles of STAYGREEN (SGR) Homologs in Chlorophyll Degradation
Yasuhito Sakuraba,박소연,백남천 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.5
Degradation of chlorophyll (Chl) by Chl catabolic enzymes (CCEs) causes the loss of green color that typically occurs during senescence of leaves. In addition to CCEs, STAYGREEN1 (SGR1) functions as a key regulator of Chl degradation. Although sgr1 mutants in many plant species exhibit a staygreen phenotype, the biochemical function of the SGR1 protein remains elusive. Many recent studies have examined the physiological and molecular roles of SGR1 and its homologs (SGR2 and SGR-LIKE) in Chl metabolism, finding that these proteins have different roles in different species. In this review, we summarize the recent studies on SGR and discuss the most likely functions of SGR homologs.