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오상근 東亞大學校 大學院 1998 大學院論文集 Vol.23 No.-
Wage ridities in the aggregate labor market has long been disputed since Keynes-Dunlop-Tarshis controversies. the purpose of this paper is to partially resolve the labor market puzzle: the weak correlation between real wage and the change in labor time while large fluctuation in the labor time and employment. The key to resolve the puzzle is to introduce precautionary saving behavior inthe asset market. The overlapping generation model in which finitely-lived agents choose labor supply and asset demand produces a "multiplier effect" in the sense that a small productivity shock results in a large and persistent fluctuation of output. The paper also explores some stylized business cycle facts: the opposite movements in leisure and consumption; the positive correlation between average productivity of labor and output; volatility of output is larger than that of consumption.
대공간 막 구조물 지붕의 수밀성능 확보를 위한 유지관리 지표 연구
오상근,김동범,이선규 한국건축시공학회 2011 한국건축시공학회지 Vol.11 No.1
With the increased demand for membrane structures in recent years, there have been many studies of their mechanical properties, to the extent that such structures have become recognized as independent structures with a level of safety and durability comparable to those of other general structures. But in reality, the study for the maintenance of membrane structures has not been as active. In particularly, the study of watertightness from the perspective of maintenance has been very limited. Accordingly, a study on securing watertightness performance and the guidelines for maintenance is necessary. In this study, through a case study of water leakage accidents in membrane structures overseas, causes of leakage were selected from the membrane material itself, joint parts and open door of roof part in membrane structure. The water leakage and deterioration elements were analyzed from those leakage causes. The degree of importance of the water leakage and deterioration index was also designated using the AHP (Analytic Hierarchy Process) method. As a result, the basic technical index was suggested for the maintenance of the roofs of large-span membrane structures to prevent water leakage. This index will be used to make a guideline for the long-term maintenance of the roofs of large-span membrane structures. 최근 막 구조물의 수요 증가에 따라 막 구조물의 구조 및 재료적 연구의 진행은 막 구조물을 하나의 독립된 구조물로써 인정받을 만큼 활발히 진행되고 있지만, 유지 관리 측면의 연구의 경우아직까지 이에 미치지 못한 상황이다. 특히 유지관리 측면에의 연구 중 지붕구조의 수밀성 및 누수에 관한 연구는 해외에서 일부만을 다루고 있어 국내 실정에 맞는 유지관리 지표 개발이 요구되고있다. 이에 본 연구에서는 막 구조물 지붕부의 막재 및 접합부,지붕 형태에 따른 누수취약부에 대해서의 하자 사례 조사를 통하여 누수 요인 및 열화 인자를 분석하였고, 이를 AHP기법을 활용하여 중요도를 부여하여, 막 구조물에서 필요한 유지관리 지표를제안하였으며, 이를 바탕으로 막 구조물 지붕의 장기적으로 수밀성 확보를 위한 설계 및 시공단계서의 수밀성 평가 지표, 준공 후사용과정에서의 점검 관리 지표를 제안하였다.
Oomycetes RXLR Effectors Function as Both Activator and Suppressor of Plant Immunity
오상근,Sophien Kamoun,최도일 한국식물병리학회 2010 Plant Pathology Journal Vol.26 No.3
Plant pathogenic oomycetes, such as Phytophthora spp.,are the causal agent of the most devastating plant diseases. During infection, these pathogens accomplish parasitic colonization of plants by modulating host defenses through an array of disease effector proteins. These effectors are classified in two classes based on their target sites in the host plant. Apoplastic effectors are secreted into the plant extracellular space, and cytoplasmic effectors are translocated inside the plant cell, through the haustoria that enter inside living host cell. Recent characterization of some oomycete Avr genes showed that they encode effector protein with general modular structure including N-terminal conserved RXLR-DEER motif. More detailed evidences suggest that these AVR effectors are secreted by the pathogenic oomycetes and then translocated into the host plant cell during infection. Recent findings indicated that one of the P. infestans effector, Avrblb2,specifically induces hypersensitive response (HR) in the presence of Solanum bulbocastanum late blight resistance genes Rpi-blb2. On the other hand, another secreted RXLR protein PexRD8 originated from P. infestans suppressed the HCD triggered by the elicitin INF1. In this review, we described recent progress in characterized RXLR effectors in Phytophthora spp. and their dual functions as modulators of host plant immunity.