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- 저자 : 정동현(Dong-Hyun Jung) (검색결과 32 건)
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다중 빔 위성 통신 시스템을 위한 공평성 기반 빔 대역폭 할당
정동현,유준규,Jung, Dong-Hyun,Ryu, Joon-Gyu 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.12
In this paper, we investigate a multi-beam satellite communication system where multiple terminals transmit information signals to the gateway via a satellite. The satellite is equipped with phased array antennas to form multiple spot beams of which bandwidths are not identically allocated. We formulate an optimization problem to maximize fairness of beam bandwidth allocation. In order to solve the problem, we propose two heuristic algorithms; iterative beam bandwidth allocation (IBBA) and request ratio-based beam bandwidth allocation (RRBBA) algorithms. The IBBA algorithm iteratively equalizes the ratio of allocated bandwidth of each beam to their resource request while the RRBBA algorithm allocates beam bandwidth calculated from the ratio. Simulation results show that the IBBA algorithm has close fairness performance to the optimum while the RRBBA algorithm has less performance than the IBBA algorithm at the price of reduced computational complexity.
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현대건축의 구축성 구현과정에 관한 연구-아라타 이소자키(Arata Isozaki)의 진화론적 구조최적화법 도입을 중심으로-
정동현(Jung. Dong-Hyun) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The purpose of this study was to explore the tectonic characteristics in contemporary architecture, which has been purely formed by result of search for essence of architecture. Arata Isozaki's recent works, was applied ESO method, contain such tectonic characteristics highly clear. The structural constitution of the form, that is operated by computer algorithm, was directly presented in its facade, and the work process was search for the most rational relationship between space and structure. This kind of materialization method was enter a new phase how to express the tectonic in shape of architecture.
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정동현 ( Dong Hyun Jung ),백원석 ( Won Seok Baek ),김승호 ( Seung Ho Kim ),전영남 ( Young Nam Chun ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
This study produces absorbent through physical and chemical activation. Optimum activation conditions are established from changing the variables that are CO2 input amount, chemicals mixing rate, activated temperature and activated time. As result of this study, Physical activation method is confirmed in case of CO2 activation that CO2 input amount “80 ml/min”, activated temperature “700℃” and activated time “90 min”. At the time, iodine adsorptivity and specific surface area shown that 272.53 mg/g and 115.04 ㎡/g. Chemical activation method is confirmed with optimum condition among chemicals in case KOH activation that activated temperature “600℃”, KOH mixing rate “1:1”, activated time “90min”. At the time, iodine adsorptivity and specific surface area shown that 412.0 mg/g and 163.92 ㎡/g. Also, the pore development and characteristic was confirmed by nitrogen adsorption and SEM.
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하수슬러지의 수증기 활성화법을 이용한 흡착제 제조와 흡착특성
정동현(Dong Hyun Jung),전영남(Young Nam Chun) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.5
현재 슬러지의 처리는 주로 해양투기에 의해 진행되는데 런던협약에 의해 슬러지 내 중금속 함량에 따라 점진적으로 해양투기가 완전 금지되어진다. 이에 하수슬러지의 안정적 처리 방안이 시급히 검토되어야 한다. 그 대책으로 최근 슬러지의 능률적이고 친환경적인 처리를 위한 방법 중 하나로 활성화를 통한 흡착제 제조가 부각되고 있다. 본 연구는 하수슬러지를 수증기 활성화법을 이용하여 흡착제로 활용하기 위한 기초연구로서 양질의 흡착제를 제조하기 위한 변수별 연구를 통한 최적 활성화조건을 연구하였다. 그 결과 요오드 흡착능을 기준으로 하여 변수별 연구를 통해 수증기 주입량 30 mL/hr, 활성화 온도 500℃, 활성화 시간 60분으로 선정되었다. 이 때 요오드 흡착능과 수율은 228.4 mg/g, 77.23%로 나타났다. 또한 질소 흡착, SEM, EDS를 이용하여 수증기 활성화에 따른 세공 발달, 비표면적, 평균 세공경 및 화학적 성상과 함량을 파악하였다. 수증기 활성화를 통해 발달되는 세공은 주로 미세 세공임을 확인하였다. Recently, the treat of sludge is usually progressed by ocean disposal. But it will be totally banned by content of its heavy metal according to London Dumping Convention, gradually. The stable way of treat of sewage sludge should be examined urgently. To solve the problem, recently, there are efficient and environment-oriented method. One of them is to produce absorbent through the activation. This study produces absorbent through steam activation. As basic experiment, optimum activation condition for preparation of good absorbent is researched through study of the following variables : steam flow rate, activated temperature, activation time. As the result of this with standard on Iodine adsorptivity, it is chosen, that steam flow rate "30 mL/hr", activation temperature "500℃", activation time "60 minutes". At the time, Iodine adsorptivity and yield shown that 228.4 mg/g, 77.23%. And also, by using nitrogen adsorption, SEM and EDS are confirmed that pore development, specific surface area, mean pore size, chemical component and content. Pore developed by steam activation is also confirmed that it is micropore.
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A Study on Surface Characteristics of High Tensile Brass with Molybdenum Flame Spray Treatment
Dong-Hyun Jung(정동현),Hae-Ji Kim(김해지) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
Molybdenum flame spray coatings are widely used in industrial fields to enhance the performance of mechanical component parts such as pistons, shafts and clutches. This study investigates the surface characteristics of high tensile brass with molybdenum flame spray treatment using the clutch material for small ship. The surface characteristics after molybdenum flame spray treatment in high tensile brass were quantitatively analyzed for surface composition, coating layer thickness, friction coefficient, abrasion width and phenomenon, micro-hardness, and surface roughness.
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