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- 저자 : Tsegay, Gebrerufael S. (검색결과 46 건)
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TSEGAYE MOLLA,SHINHYUNG KIM(김신형),SUNGHUN JUNG(정성훈) 한국항공우주학회 2024 한국항공우주학회 학술발표회 논문집 Vol.2024 No.4
This paper proposes an integrated architecture for Thrust Vector Control (TVC) and Reaction Gas Control (RGC) for rocket landing. The architecture is based on a non-linear, six-degrees-offreedom model for the generic thrust-vector and reaction gas-controlled rocket dynamics and kinematics, deduced and implemented in a realistic simulation environment. For control design purposes, a linearized version of the model is proposed. Four-sided gas-thruster and single-nozzle TVC actuation is adopted, allowing for pitch and yaw control, with the control law being derived from the Linear Quadratic Regulator (LQR).
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Gebrie Tsegaye Mersha,Yetnayet Fantaye Tadesse 대한공간정보학회 2019 Spatial Information Research Vol.27 No.4
The study aimed to produce a map for livestock movement routes in Teru and Afambo district in Afar region, Ethiopia. The specific objectives of the study were identifying the major reasons of livestock movement, investigating challenges faced during the movement and producing livestock movement route maps. The primary data were mainly collected through key informant interviews, focus group discussion and Global Positioning System instrument. Stratified and purposive sampling techniques were used to select the study area and key informants respectively. Narration and ArcGIS software were used to analyze the data. The result showed that finding grazing land, market center and salty water are the three main purposes of livestock movement. The pastoralists face several challenges during their movement that affect their livestock lives and themselves. In order to reduce the effect of these challenges infrastructures should be built on the main routes of the movement based on the produced maps.
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