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Robust Optimization via Randomized Algorithms
Yasumasa Fujisaki,Takayuki Wada 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper gives an overview on probabilistic approach to robust optimization and chance constrained optimization. The problems are to minimize a linear objective function subject to a parameter dependent convex constraint, where a probability measure is introduced onto the parameter set. Two randomized techniques, the scenario optimization and the sequential optimization, are summarized, where characteristics and advantages of both techniques are discussed.
매립 구조를 이용한 침출수 이동의 적극적인 제어 - 수학적 연구 -
( Yasumasa Tojo ),( Nobutoshi Tanaka ),( Toshihiko Matsuto ),( Takayuki Matsuo ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
매립 구조에 의해서 물 흐름의 적극적 제어를 조사하기 위해 수학적 연구가 수행되었다. 매립지의 각 부분에서 물의 흐름을 설명하기 위한 식이 이전의 연구에서 도출되었다. 매립 구조의 3가지 형식이 가정되었고, 3도시의 실제 강우자료가 적용되었다. 매립지 각 부분에서의 물의 우회와 매립지 바닥에서의 압력 수두를 평가했다. 이 결과, 다음과 같은 정보를 얻었다. 중간 복토 토양의 투수성은 수평 이동을 촉진하고, 수직 침투율을 제어하기 위해 중요하다. 매립지 바닥에 차단벽을 적용하는 것이 라이너에 양압이 걸리는 것을 막는데 효과적인 방법이다. Numerical study was carried out to investigate active control of water flow by landfill structure. Formulas that explain water movement in each part of a landfill were derived from past studies. Three types of landfill structure were assumed and actual rainfall data of three cities were adopted. Water diversion at each landfill part and the pressure head on the landfill bottom were evaluated. As a result, the following information was obtained. Hydraulic conductivity of intermediate cover soil is important to promote lateral diversion and to control the vertical infiltration ratio. Application of a capillary barrier at the landfill bottom is absolutely effective for avoiding a positive pressure head on the liner.
The New Dynamics of East Asian Regional Economy: Japanese and Chinese Strategies in Asia
( Yasumasa Komori ) 인하대학교 국제관계연구소 2006 Pacific Focus Vol.21 No.23
The Japan-led flying-geese pattern of economic development has become obsolete as an accurate description of the pattern of economic relations in East Asia. Meanwhile, the rise of China as the world`s production platform has become the most significant factor in transforming the East Asian regional economy. Although the Asian financial crisis served as a major catalyst for the emergence of ASEAN+3, the China factor looms increasingly important in the subsequent development of East Asian regionalism. Despite its enhanced position in the region, however, China`s new role in East Asia is clearly different from the role that Japan played at the zenith of its economic prosperity. While Japan`s economic engagement in Asia was based on economic penetration by Japanese multilateral firms, China`s rapid growth is still predicated upon foreign capital and technology. China`s strength lies in its ability to open up its economy for trade and investment. In trade negotiations with ASEAN, China has taken the lead, surpassing Japan, a country constrained by domestic politics. However, Japan remains an important partner for ASEAN countries, not only in providing financial and developmental assistance, but also in hedging against China`s dominance.
Yasumasa Kuwahara,Naoki Mori,Kiminori Shimizu,Chihiro Tanaka,Mitusya Tsuda Korean Society of Applied Entomology 1998 Journal of Asia-Pacific Entomology Vol.1 No.1
Female sex pheromones, which elicit mounting behavior of conspecific males, were identified in 4 species of the genus Caloglyphus(Acarina: Acaridae). Although the sex pheromones are distributed over both males and femles, they could be classified into two groups; one is an adult-specific pheromone, and the other is one that is detectable even in nymphal stages. In addition, in the adult-specific species, the pheromonal content ratios of female to male were found to be larger than those observed in the nonspecific species. The two types of pheromonal distribution were compared with phylogenetic relationships based on a portion of the mitochondrial cytochrome oxidase subunit I(COI) gene in the four species. The polymerase chain reaction was used to amplify the COI from the four mites, with primers used in spider mites(Tetranychidae). Fragments of the COI(453bp) were obtained for the three species. The phylogenetic tree, based on the COI sequences, was inferred using a maximum parsimony method. Analysis of the pheromonal distribution within this phylogenetic framework agreed with the hypothesis that the mite sex pheromone evolved from a common compound, which originally fundtioned as a male sexual excitant, into a biologically active, sex linked specific one.