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시공성을 고려한 H형강 기둥의 신형상 약축접합부 내진성능평가
김성배,조한솔,이태규,김상섭,Kim. Sung Bae,Cho. Han Sol,Lee. Tae Gyu,Kim. Sang Seup 한국방재학회 2014 한국방재학회논문집 Vol.14 No.2
H형강 기둥에 대한 신형상 약축접합부를 개발하여 단조가력실험을 통해 구조성능평가에 관한 연구를 수행하였으며, 선행연구결과를 바탕으로 본 연구는 시공성을 고려한 신형상 약축접합부의 내진성능을 평가하기 위해 반복가력실험을 실시하였다. 신형상 약축접합부는 접합개소 및 용접량이 적고 접합상세가 단순하며, 접합부에 작용하는 힘의 흐름이 명확하다는 장점이 있다. 이에 따라 H형강 기둥플랜지와 보 단부의 겹침길이를 실험변수로 한 신형상 약축접합부(WPL-WK-FC2, WPL-WK-FC3)와 건축강구조 표준접합상세지침에 근거한 표준 약축접합부(HH-WK-FC4) 총 3개의 실험체를 실물대 사이즈(Full-scale)로 제작하였다. 실험결과, 신형상 약축접합부는 0.04 rad 이상의 층간변위각에서 보 소성모멘트(<TEX>$M_P$</TEX>)의 80%이상을 유지하는 특수모멘트골조(SMF)의 내진성능을 확보하였으며, H형강 기둥플랜지와 보 단부의 겹침길이가 50 mm 이상이면 시공성 뿐만 아니라 구조적으로 우수한 것으로 나타났다. H-section steel column new shape weak-axis was developed and performed through monotonic loading test regarding basic structural performance evaluation. In this study cyclic loading test was followed up in order to evaluate seismic performance through the full-scale of new shape weak-axis connection for constructabilitiy. New shape weak-axis connection has a simple shape with the less spot of welding points, and it has advantage about showing the obvious flow of strength in connection points. Therefore, three specimens are built for the variables which are overlap length of beam-end and column flange. As the result, New shape of weak-axis connection is appeared special Moment Frame(SMF) and have excellent structural performance and constructablility when the parameter is over 50 mm.
물로 가수분해된 섬유성 기질로부터 hemicellulose 회수
김성배,김창준 한국생물공학회 2005 KSBB Journal Vol.20 No.4
Various recovery methods were investigated to maximize hemicellulose recovery from lignocellulosic material hydrolyzed by pure water. The pretreatment conditions of water hydrolysis were 170~180℃ and 1 hour of reaction time. The percentage of hemicellulose solubilized increased as the temperature increased from 170 to 180℃. However, significant decomposition of sugar was observed at temperature of 180℃. From the results of water hydrolysis, the total amount of glucan in solid residue and liquid hydrolyzate was close to the total glucan in the original biomass. For hemicellulose, however, there was a significant difference between both contents. To prove this difference, various recovery methods were proposed. From the total sugar accountability (sugar in liquid + sugar in solid), it was confirmed that hemicellulose recovery in the hydrolyzate was increased if the product including both hydrolyzate and solid residue was physically stimulated by such as heating and ultrasound irradiation. This indicated that, in commercial scale processes that much bigger substrate sizes are used and a sufficient amount of leaching solvent can not be used after pretreatment, a significant amount of oligomers could be trapped in the solid matrix. 섬유성 기질을 물 가수분해하여 생긴 당을 최대한 회수하는 여러 회수방법을 조사하였다. 사용한 전처리 조건은 반응온도가 170~180℃, 반응시간이 1시간이었다. 반응 온도가 170에서 180℃로 증가함에 따라 xylan의 용해율은 증가하지만 180℃ 이상에서는 상당양의 당이 분해됨을 알 수 있었다. 가수분해 결과로부터 남은 고체기질과 당화액에서 얻은 당의 물질수지를 조사하였는데 glucan의 경우는 비교적 잘 맞으나, 헤미셀룰로오스는 처리되지 않은 기질에 포함된 초기양과 비교할 때 상당한 차이가 났다. 그래서 여러 가지 회수방법을 고안하여 당의 물질수지를 조사한 결과 회수기간동안 열을 가하거나 초음파를 조사하는 방법과 같은 물리적인 자극을 주면 액상에서 헤미셀룰로오스 회수율이 증가되는 것이 확인되었다. 이런 사실로부터 당 회수시 기질이 크고 전처리 후 침출용매를 많이 사용할 수 없는 상업적인 공정의 경우 상당양의 올리고당이 고체기공내 갇혀 액상으로 회수되지 못할 것으로 생각된다.
The Role of Government in the Redistribution of Property Rights: The Case of the Korean Greenbelt
김성배 한국행정학회 2004 International Review of Public Administration Vol.9 No.1
This study addresses Korean Greenbelt revision. This revision may be labeled a puzzle based on the fact that although the Greenbelt had been considered to be one of the most impregnable institutions in Korea it is now faced with a complete reformulation following the previous government reform initiation six years ago. In order to solve the puzzle, this study adopts an approach that focuses the role of the government in the redistribution of property rights. To do so, this study first describes in detailed fashion the process of the Greenbelt revision from 1997 up to the present. Secondly, this study delineates three models on the role of government in the redistribution of property rights: the naive model, the interest group model, and the strong state model. Thirdly, this study attempts to empirically assess the most adequate model to explain the role of the government in the revision of the Korean Greenbelt. Finally, this study draws policy implications using both theoretical and empirical analyses. The major policy recommendation drawn from the analyses is that, as the major impetus behind the revision of the Korean Greenbelt appears to be the realization of the private interests of the ruler at the costs of the general public, a mechanism should be strengthened to restrain the exercise of power by the ruler of the government with regards to the redistribution of property rights.