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한용석(Yong Suk Han),박순영(Soon Young Park),최병기(Byung Ki Choi),정세영(Se Young Choung) 한국응용약물학회 2001 Biomolecules & Therapeutics(구 응용약물학회지) Vol.9 No.1
N/A The current study was performed to determine the acute oral toxicity of a crude extract of sanghwang mushroom (Phellinus linteus), in SD rats. 5 rats of each sex were orally treated with a single dose of extract of sanghwang mushroom at doses of 0, 500, 1,000, 2,000 mg/kg, respectively. After the treatment, clinical signs and body weight change, the food and water consumption were observed for 14 days. All animals survived during the the study and did not show any clinical signs. Body weight gain showed no significant difference between the control and treated rats. However, body weight gain delayed in high dose group (2,000 mg/kg) on day 1∼3 after administration. Another 5 rats of each sex were orally treated with a single dose of extract of sanghwang mushroom at dosages 4,000, 5,000 mg/kg respectively, but all animals survived during the study and did not show any clinical signs. It is suggested that LD_(50) of extract of sanghwang mushroom by oral administration was estimated to be over 5,000 mg/kg in both sexes of rats.
그리드 데이터베이스에서 링 기반 연결 구조를 이용한 부하 분산 기법
장용일(Yong-Il Jang),신숭선(Soong-Sun Shin),박순영(Soon-Young Park),배해영(Hae-Young Bae) 한국멀티미디어학회 2006 멀티미디어학회논문지 Vol.9 No.9
본 논문에서는 복제 데이터 간 링 기반 연결 구조를 이용한 부하 분산 기법을 제안한다. 그리드 데이터베이스에서는 일반적으로 각 노드의 데이터가 처리 성능과 가용성 향상을 위해 서로 다른 위치에 복제되어 저장되고, 사용자 질의는 목적 데이터를 포함하는 노드로 전송된 후 처리된다. 그러나 이러한 환경에서는 작업 부하의 불균형으로 인한 성능 저하가 나타날 수 있다. 기존 연구는 노드의 수가 많고 사용자 질의가 유동적으로 변하는 그리드 데이터베이스에는 적용하기 힘들다. 제안 기법은 각각의 동일 복제본이 포함된 노드들을 하나의 링 구조로 연결한다. 노드의 작업 부하가 한계를 넘게 되면, 이후 입력되는 질의의 목적 데이터에 따라 다음 연결 노드로 질의를 전송한다. 그리고 이 노드는 작업 부하가 적어질 때까지 새로운 질의를 입력받지 않는다. 이후, 이전 노드로 메시지를 전송하여 이 노드로 질의가 전달되지 않도록 연결 구조를 변경한다. 제안 기법은 성능평가를 통해 기존 방식에 비해 다수의 노드를 포함하면서 구조가 동적으로 변화하는 환경에서 기존 기법보다 우수한 성능을 보인다. In this paper, a load balancing method using ring network structure in the Grid database is proposed. In the Grid database, generally, data is replicated for performance and availability. And, user's request is transferred to node and processed in that node which has target data. But, in such environment, a decline of performance can be occurred because unbalanced workload. A traditional research is proposed to solve unbalanced load problem. However, the Grid database has a number of systems and user's request always changes dynamically. Therefore, a traditional research can not be applied. The proposed method connects each node which has a same replicated data through ring network structure. If workload is overflowed in some node, user's request is transferred to a linked node which has a target data. And, this node stops another request processing until workload is decreased. Then, it changes the link structure through sending a message to a previous node, to stop request forwarding from a previous node. This paper shows a proposed method increases performance than existing research through performance evaluation and is more suitable for a complex and dynamic environment.
이순환(Soon-Hwan Lee),이화운(Hwa-Woon Lee),박순영(Soon-Young Park),김현구(Hyun-Goo Kim),강용혁(Yong-Heack Kang),김광득(Kwang-Deuk Kim) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
The purpose of this paper is to evaluate the wind energy resources with high spatial resolution in Sunghak Mountain in Busan metropolitan area under various atmospheric stability. Numerical model used in this research is A2C (Atmosphere to CFD), mainly applied on assessing regional scale and microscale meteorological phenformin. When the atmospheric stability become strong, wind run around mountain side. Since potential energy tends to be stronger at strong at that time, wake on lee side of mountain and variation of flow are induced naturally. On the other hand, cavity region at lee side of mountain tends to be occurred and expanded according to the decrease of atmospheric stability. Analysis on the wind energy distribution at several sites from numerical assessment confirmed quantitatively that wind resources at the top of the mountain is more suitable to establish wind energy complex than that in its slope.
정용현,이은석,박순영,양창환,정진택,Chung, Yong-hyun,Lee, Eun-seok,Park, Soon-young,Yang, Chang-hwan,Jung, Jin-taeg 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.2
The structural analysis of liquid rocket engine was performed in the case of sinusoidal vibration load to verify structural safety. The finite element model is composed with main liquid rocket engine components, combustion chamber, turbopump, gas-generator, pyro-starter, main pipes, main valve, heat-exchanger, gimbal-mount and brackets. Natural vibration mode analysis and structural analysis for sinusoidal vibration load were performed. The natural mode frequency of liquid rocket engine is twice than that of launch vehicle. In the case of stress result of sinusoidal vibration load, the part of maximum stress has 1.4 margin, so the engine structure is safe for sinusoidal vibration load.