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자여자 유도발전기 전압제어기와 전력회수장치의 협조제어 방법
김용은(Yongeun Kim),박현배(Hyun Bae Park),문희석(Hee Seok Moon),조현종(Hyun-Jong Cho) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Self-Excited Induction Generator is the power generated by the LC resonance and can control the braking torque through the control voltage. If the state of the battery is not fully charged electric power is charged to the battery. If the battery is fully charged, electric power discharge through the resistor. Therefore, charger and voltage controller should be controlled by the case. In this paper, we proposed efficient method of assist control method of voltage controller and charger and we verified through testing.
The design of an efficient load balancing algorithm employing block design
Ilyong Chung,Yongeun Bae 한국전산응용수학회 2004 Journal of applied mathematics & informatics Vol.14 No.-
In order to maintain load balancing in a distributed system, we should obtain workload information from all the nodes on network. This processing requires O(v2) communication overhead, where v is the number of nodes. In this paper, we present a new synchronous dynamic distributed load balancing algorithm on a (v, k + 1, 1)-configured network applying a symmetric balanced incomplete block design, where v = k2+k+1. Our algorithm needs only O(vpv) communication overhead and each node receives workload information from all the nodes without redundancy. Therefore, load balancing is maintained since every link has the same amount of traffic for transferring workload information.
박현배(Hyun Bae Park),김용은(Yongeun Kim),조현종(Hyun-Jong Cho),문희석(Hee Seok Moon) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Induction generator requires an excitation current to generate a rotating magnetic field by magnetize the iron core. Self-Excited generator is consist of inductor and capacitor. It is cheaper and maintenance is easier, so it has been applied to wind power. Self-Excited generator utilizes the principles of mutual resonance inductor and the capacitor so it generates a high voltage and greater the heat in the rotor. Therefore Power of Self-Excited generator should be controled by voltage control. In this paper, We implemented Controller of Resonant voltage and we verified the controller operating performance by motor dynamo.
디지털 서명 기반 안전한 이동 에이전트 보안 시스템의 설계
김성열,한승조,배용근,정일용 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.1
Network-based application and programming have recently drawn considerable attention to electronic commerce. For developing this application easily, a new technology, language and paradigm make an appearance. In particular, mobile agent is focused on. When mobile agent operated in distributed network environment, it may offer enormous advantages. However, Mobile agent system have significant problems on information security owing to migration from server to server. Therefore, in this paper, we analyze the security component and propose the communication protocol to solve these problems. Security problems of mobile agent system is composed of utilization of unsecure communication channel, an attack on agent executed by malicious host, and an attack on host executed by malicious agent. Theses problems can be solved when the following functions are offered; authentication, confidentiality, integrity, prevention of repudiation and etc. The proposed protocol is designed to provide security services with mobile agent systems by employing bidirectional authentication of agent server, and Identity-based key distribution and the digital multi-signature for protection of execution data. Identity-based cryptography mechanism can simplify the distribution and management of key. This is one of features on the proposed protocol. Also, it guarantees the liveness of agent on the basis of audit of agent execution and protects the execution data.
Simulations of low impact development designs using the storm water management model
Jiyi Jang,Soobin Kim,Sung Min Cha,JongCheol Pyo,Kwang-Sik Yoon,Hankyu Lee,Yongeun Park,In-Su Jang,Kwang-Ju Kim,Jung-Won Yu,Mi-Seon Kang,Hyan-Su Bae,Sang-Soo Baek,Kyung Hwa Cho 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.6
This study assessed the U.S. Environmental Protection Agencys Storm Water Management Model (SWMM) for urban water management challenges. This study conducted a sensitivity analysis to identify the most influential factors in the SWMM. Moreover, the performance of SWMM was evaluated with the HYDRUS-1D module in simulating infiltration rates. The sensitivity results showed field capacity as the most significant factor, highlighting the need for advanced modeling techniques to consider factors like field capacity. The SWMM was evaluated by the HYDRUS-1D that SWMM consistently underestimated peak infiltration rates and commenced infiltration calculations only when soil moisture exceeded field capacity. It reveals its limitations in handling unsaturated soil conditions and highlights the consideration of the matric head of the soil during the infiltration calculation in soil media. Moreover, the evaluation of bioretention areas showed larger areas resulting in more substantial flow reductions but with significant variability under different rainfall conditions. Accordingly, this result emphasizes the importance of careful consideration for environmental factors in bioretention design. This study contributes by enhancing understanding of SWMMs limitations in simulating urban water management challenges. Thus, this research will offer technical assistance to stakeholders focused on challenges such as runoff, hydrologic cycle, and urban flooding in urban areas.