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위성자료를 이용한 중국과 몽골 사막주변의 식생수분상태 모니터링
이가람 ( Ga Lam Lee ),김영섭 ( Young Seup Kim ),한경수 ( Kyoung Soo Han ),이창석 ( Chang Suk Lee ),염종민 ( Jong Min Yeom ) 한국지리정보학회 2008 한국지리정보학회지 Vol.11 No.4
기후 시스템에서 지구온난화는 세계적으로 매우 중요한 문제이고 이는 기후변화, 이상기온, 폭우, 가뭄 등의 문제를 초래한다. 특히 가뭄은 기후변화에 의해 여러 해 동안 진행되어온 사막화를 가속화시킨다. 본 연구의 목적은 중국과 몽골 사막주변의 식생수분상태를 탐지하는 것이다. 본 연구에서는 중국과 몽골 사막 주변의 식생수분지수를 산출하기 위해 1999년부터 2006년까지의 SPOT/VEGETATION 위성 이미지를 이용하여 정규수분지수(NDWI: Normalized Difference Water Index)를 산출하였다. 건조한 상태의 식생은 사막화되기 쉽기 때문에 식생 수분은 사막화의 중요한 지표이다. SPOT/VEGETATION 위성영상의 근적외밴드(NIR)와 단파적외밴드(SWIR)의 밴드간 연산을 통하여 NDWI를 구하여 식생의 수분입자를 측정하였다. 그 결과 1999년부터 2006년까지의 NDWI는 사막주변영역에서 감소하는 경향을 보였고, 그 영역은 몽골 고비사막 북동지역과 중국 타클라마칸 사막의 남동지역에 위치해 있었다. Recently, global warming for climate system is a crucial issue over the world and it brings about severe climate change, abnormal temperature, a downpour, a drought, and so on. Especially, a drought over the earth surface accelerates desertification which has been advanced over the several years mainly originated from a climatic change. The objective of this study is to detect variation of vegetation water condition around China and Mongolia desert by using satellite data having advantage in observing surface biological system. In this study, we use SPOT/VEGETATION satellite image to calculate NDWI (Normalized Difference Water Index) around study area desert for monitoring of status of vegetation characteristics. The vegetation water status index from remotely sensing data is related to desertification since dry vegetation is apt to desertify. We can infer vegetation water status using NDWI acquired by NIR (Near infrared) and SWIR (Short wave infrared) bands from SPOT/VGT. The consequence is that NDWI decreased around desert from 1999 to 2006. The areas that NDWI was decreased are located in the northeast of Mongolian Gobi desert and the southeast of China Taklamakan desert.
T형 합성보의 Shear Connector 형태에 따른 전단내력 평가
이상업,표현석,김도훈,이창남,김상섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Stud connector has been used by shear connector of composite beam. Shear connector is important element to heighten composition rate of composite beam. This study based on the experiments of 15 specimens by Push-Out Test. In this paper, we analyze shear connector of other form instead of stud connector through an experimental study and wish to present application possibility to T-type Steel Composite beam.
이지운,김성배,김상모,이창남,김상섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Composite action can be achieved by providing shear connectors between steel top flange and concrete topping. Composite sections have larger stiffness than the summation of the individual stiffness of slab and beam, therefore, can carry larger load or similar loads with appreciably smaller deflection and are less prone to transient vibration. T-type Steel Composite beam(TSC-beam) is developed and tested. The test results of TSC beam are compared with the theoretical results based on composite actions.
TSC 합성보의 제작방법에 따른 구조적 거동에 관한 실험적 연구
이지운,김도훈,김성배,이창남,김상섭,김규석 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Composite action can be achieved by providing shear connectors between steel top flange and concrete topping. Composite sections have larger stiffness than the summation of the individual stiffness of slab and beam, therefore, can carry larger load or similar loads with appreciably smaller deflection and are less prone to transient vibration. T-type Steel Composite beam(TSC-beam) is developed and tested. To make the part of steel beam, we used the way of welding two steel plates as well as the way of folding one steel plate.
대구경 볼트와 와이어텐션을 이용한 슬래브 보강공법에 관한 실험적 연구
서동기,노현섭,김상모,이창남,김상섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
As time goes up, structural capacity of members decreases in reinforced concrete structures. The deterioration of the capacity is mainly due to the poor construction, corrosion of steel bars and the neutralization of concrete due to environmental pollution, etc. This deterioration is unavoidable, thus it is necessary to develop the method for repair and retrofit of structures in order to ensure structural safety of members. The purpose of this paper is to investigate the load-deflection, ultimate strength, failure mode, and energy absorption capacity of reinforced concrete slabs subject to load experimentally for several variables and grasp the problem of concrete slabs strengthened with large diameter bolts and wire tensioning. And propose foundational research data for4 strengthening reinforced concrete slabs. The test result shows that the capacity of anchorage is controlled by bearing capacity of concrete under the anchorage or punching shear around the anchorage. And the gap between bolts and core hole must be filled to prevent slip and rotation of anchorage.
표현석,김성배,김상모,이창남,김상섭,김규석 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Connection is necessary element of every structure. Connection is important element to increase composition rate of composite beam. Welding joint has been used at composit beam-column connection. Welding joint's quality control is harder than high strength bolt's one. This study based on the experiments of 4 specimens by beam-column connection test. In this paper, we analyze behavior of composite beam-column connection through an experimental study and wish to present application possibility to TSC beam.
김도훈,원학재,김성배,김상모,이창남,김상섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
As time goes up, structural capacity of members decreases in reinforced concrete structures. The deterioration of the capacity is mainly due to the corrosion of materials, poor construction and environmental pollution, etc. This deterioration is unavoidable, thus it is necessary to develop the method for repair and retrofit of structures in order to ensure structural safety of members. The purpose of this paper is to investigate the load-deflection, ultimate strength, failure mode, and energy absorption effect. For the test, the specimen size of column is 20cm×20cm×90cm reinforced with 4 number of main bars of 13mm diameter, tied bars of 6mm diameter. The test results show that the increasement of bolt and bolt tension's quantity improve the ultimate strength and energy absorption capacity.
Zero-Power Control of Magnetic Levitation Vehicles with Permanent Magnets
Chang-Hyun Kim,Han-Wook Cho,Jong-Min Lee,Hyung-Suk Han,Bong-Seup Kim,Dong-Sung Kim 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper deals with the zero-power control of magnetic levitation (maglev) vehicles that use permanent magnets as well as electromagnets for levitation. The nominal load is levitated by permanent magnet and the current consumption for stable levitation can be reduced. In order to guarantee the tracking capability, the proposed controller is based on the state feedback controller and modified to balance attraction force and total weight. The commanded voltage is used instead of the coil current in the feedback loop so that the current measurement can be avoided. A full-scale hybrid maglev tester was constructed and some experiments were carried out to show the performance of the proposed method.