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콘크리트 궤도와 교량 상판과의 종 방향 분리 정도에 따른 상호작용 특성
송대석(Dae-Seok Song),최신형(Sin-Hyung Choi),성인모(In-Mo Sung),임남형(Nam-Hyoung Lim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5
철도 교량은 도로 교량과 달리 열차의 연직 하중, 시·제동 하중, 그리고 온도하중으로 인해 종 방향 하중이 일정 주기로 구조물에 전달된다. 이러한 종 방향 하중으로 인한 상호작용의 저감을 위해 궤도 슬래브와 교량 상판 사이에 슬라이드 층을 삽입한 LCPBT(Longitudinally Coupled Prefabricated Ballastless Track)를 사용하는 사례가 있다. 본 연구는 경간장 연장 및 연속화를 위한 연구로써 유한요소해석을 통하여 슬라이드층이 고려된 철도 교량의 콘크리트 궤도와 교량 상판과의 종 방향 분리 정도에 따른 종 방향 상호작용 저감효과를 분석 하였다. Unlike road bridge, longitudinal load caused by loads(vertical, braking, acceleration, temperature) is delivered to structure on a cycle in railway bridge. There is a case using LCPBT(Longitudinally Coupled Prefabricated Ballastless Track) inserted slide layer between concrete slave and bridge floor to reduce interaction effect according to longitudinal loads. It is needed to enhance the application of railway bridges with longer continuous span from now on. The purpose of this study is enhancing the application of railway bridges with longer continuous span, and reduction effect of railway bridge inserted slide layer is analysed using finite element analysis.
송대석(Song, Dae-Seok),이임정(Lee, Lim-Jung),최주영(Choi, Joo-Young) 한국도시부동산학회(구.도시정책학회) 2021 도시부동산연구 Vol.12 No.3
This study is basic research through the analysis of building landscape plan evaluation item’s importance limited to the analysis of the importance of building landscape deliberation evaluation item. As for the scope of the research content, the criteria for building landscape plan evaluation items obtained from existing studies were assessed and priorities about the evaluation items were presented. The overall ranking of the factors of the building landscape plan’s evaluation item is the following: consideration of the surrounding street system to prevent existing pedestrians’ traffic disengagement > vehicle/parking/pedestrian circulation plan for pedestrian environment> avoidance of uniform, exaggerated, and closed design > plan public notices for integrated use> right to sunlight> harmony with the size and height of buildings in the surrounding area> integrated universal design and applied guidelines> consideration of the surrounding area’s street, park, and green area system> external space plan for the disabled and the elderly> harmony with the size and the height of major mountain views> arrangement to minimize green damage and topographical changes> height management principle plan> Presentation of soft light that blends in with the surrounding> avoiding the installation of excessive facilities for building entry> fence designs that harmonize with the surrounding> plans for lighting and ventilation> assessment and plans for the structure> harmony of the outdoor advertisements and large electronic displays with the surroundings.
범용 컴퓨터의 암호시스템을 위한 의사난수 생성기 구현에 관한 연구
송대석(Song Dae Seok),남길현(Nam Kil-Hyun) 한국정보과학회 1987 한국정보과학회 학술발표논문집 Vol.14 No.2
본 논문은 지금까지 일반화되어 사용되어진 의사난수 생성기를 범용 컴퓨터의 암호 시스템에 이용하므로서 발생할 수 있는 문제점을 분석하고 이러한 문제점을 해결할 수 있는 즉, 자료의 중요성에 따라 비도의 확장이 가능하고 키 영역의 제한상태를 제거하며 균일한 키의 문자발생 빈도수 및 장주기를 보장할 수 있는 범용 컴퓨터의 암호시스템을 위한 의사난수 생성기를 구현하였다. 그리고 구현한 의사난수 생성기를 이용하여 One-time Pad 방법과 COMPLEMENT-PLUS와 EXCLUSIVE-OR의 특성을 복합한 비도가 높은 암호화 및 해독 알고리즘을 제시하였다.
재조합 골형성 단백질 2형(rh-BMP-2) 함유 무세포성 진피조직(acellualr dermal matrix)의 골재생 효과
송대석,김태균,정의원,최성호,조규성,채중규,김종관,김창성,Song, Dae-Seok,Kim, Tae-Gyun,Jung, Ui-Won,Choi, Seong-Ho,Cho, Kyoo-Sung,Chai, Jung-Kiu,Kim, Chong-Kwan,Kim, Chang-Sung 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.3
Introduction : The purpose of this study was to evaluate the possibility of the acellular dermal matrix (ADM) as a barrier membrane for bone regeneration, and to evaluate the osteogenic effect of ADM as a carrier system for rhBMP-2 in the rat calvarial defect model. Materials and Methods: An 8-mm, calvarial, critical-size osteotomy defect was created in each of 60 male Spraque-Dawley rats(weight $250{\sim}300g$). Three groups of 20 animals, each received either rhBMP-2(0.025mg/ml) in an ADM carrier, ADM only, or negative surgical control. And each group was divided into 2- and 8-weeks healing intervals. The groups were evaluated by histologic and histomorphometric parameters(10 animals/group/healing intervals). Data were expressed as $means{\pm}standard$ deviations($m{\pm}SD$). Comparisons between experimental and control groups were made using two-way ANOVA and post hoc t-test. Comparisons between 2 weeks and 8 weeks were made using paired t-test. The level of statistical difference was defined as P< 0.05. Results : The ADM group and rhBMP-2/ADM group results in enhanced local bone formation in the rat calvarial defect at both 2 and 8 weeks. The amount of defect closure and new bone formation were significantly greater in the rhBMP-2/ADM group relative to ADM group(P<0.05). At 8 weeks, the majority of ADM in the defect was contracted, and integrated with surrounding host tissues. In addition, host cell infiltration and neovascularization of the ADM in the absence of an inflammatory response were observed, and the newly formed bone around ADM showed a continuous remodeling and consolidation. Conclusion : The results of the present study indicated that ADM may be used as a barrier membrane for bone regeneration and that may be employed as a delivery system for BMPs.
Gasket 방식 판형 열교환기의 고·저온부 유량 및 압력차에 따른 압력강하 특성
안준(Joon Ahn),김혁주(Hyouck Ju Kim),최규성(Kyu Sung Choi),송대석(Dae Seok Song) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In a gas engine based cogeneration system, heat is recovered from two parts, which are jacket water and exhaust gas. The heat from the jacket water is often recovered by a plate type heat exchanger and used for the room heating and/or hot water supply. Depending on the operating conditions of engine and heat recovery system, there should be imbalance in the flow rate and supply pressure between engine and heat recovery side of the heat exchanger. The imbalance cause the deformation of the plate, which affects the pressure drop characteristics. In the present study, the pressure drop inside the heat exchanger has been investigated in a 1/5 scaled test rig and compare with the experimental correlations, which are used for the design.
화염분할을 이용한 VIStA 관류 보일러의 NOx 저감
안준(Joon Ahn),김혁주(Hyouck Ju Kim),최규성(Kyu Sung Choi),송대석(Dae Seok Song) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
VIStA (Vortex Inertial Staged Air) burner has been applied to an once through type boiler. The secondary air is supplied through a swirler instead of nozzles, which stabilize the flame and reduce Carbon Monoxide (CO) emission. However, the modification increases the emission of Nitrogen Oxiedes (NOx). To balance the emissions of two pollutants, divided flame has been adopted. An air damper is installed to control the distribution of air to each combustion chamber. Three types of flame dividers have been tried. The effects of air-fuel ratio and combustion load on the NOx formation have been investigated. The divided flame can reduce the NOx emission up to 25%, while it generates CO within 10 ppm.
매트 형태의 예혼합 촉매 버너를 활용한 25 ㎾급 건조기의 성능 특성
안준(Joon Ahn),김혁주(Hyouck Ju Kim),송광섭(Kwang Sup Song),최규성(Kyu Sung Choi),송대석(Dae Seok Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A catalytic burner has been developed to utilize thermal energy from the fossil fuel without nitrogen oxides (NOx) emission. The burner is shaped into a mat to maximize the heating surface. Premixed combustion has been developed to be used in a closed chamber, such as a radiation type industrial dryer. The burner yields the thermal energy in the form of thermal radiation in the infrared regime, which is proved to be effective to dry organic substances for low moisture condition. Thermal efficiency including the sensible heat is better correlated to the moisture compared to the dry rate.