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분산환경에서 멀티에이전트 상호협력을 통한 신뢰성 있는 정보검색 기법
박민기 ( Min-gi Park ),김귀태 ( Gui-tae Kim ),이재완 ( Jae-wan Lee ) 한국인터넷정보학회 2004 인터넷정보학회논문지 Vol.5 No.5
인터넷이 널리 보급되면서 지능형 검색 에이전트들이 사용자의 요구를 만족시키기 위해 일반화되어 사용되고 있다. 그러나 이러한 지능형 멀티에이전트들은 서로 독립적으로 사용되어 멀티에이전트들 간의 분산된 정보를 원활하고 효율적으로 처리하기 위한 상호 협력 작용이 부족해 정보의 신뢰성이 낮고 동적으로 변화하는 분산 환경에 대처하기가 어렵다. 이런 문제를 해결하기 위해 본 논문에서는 멀티에이전트간의 효율적인 상호 협력과 빠른 정보처리를 위해 브로커 에이전트에 에이전시를 생성하고 신경망을 이용해 멀티에이전트들의 에이전시들을 분류하여 더욱 신속정확한 정보를 사용자에게 제공하도록 한다. 또한 정보의 신뢰성을 위해서 에이전트 관리기법을 제안하여 기존의 검색 시스템이 가지고 있는 정보갱신문제를 향상시키고, 시뮬레이션을 통해 본 연구의 성능을 평가한다. As the internet is widely distributed, the intelligent search agent is commonly used to meet the needs of user. But these Intelligent multi-agents are so independent each other that they can not give reliability of information and also have difficulty in coping with the dynamic distributed environments due to the short of cooperation abilities among multiagent. To resolve these problems, this paper proposes the mechanism for efficient cooperation and information processing by creating agency within broker agent and clustering multiagent`s agency using neural network. For reliability of information, we also propose the multiagent management mechanism that can improve the information update problems which are in existing search systems and evaluate the performance of this research through simulation.
계통 연계형 인버터의 DC-Link 전압 가변을 통한 소형 풍력발전 시스템의 MPPT 제어
박민기(Min-Gi Park),이준민(Joon-Min Lee),홍주훈(Ju-Hoon Hong),김영석(Young-Seok Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
In this paper, the Maximum Power Point Tracking(MPPT) control of the small scale wind power generation system with a three-phase diode rectifier and the grid-connected inverter is studied. Without the need for the converter circuits to control speed of the generator, it is economical and the structure is simple. Compared with existing systems, it can be to reduce the power semiconductor switches and passive elements, and to implement the MPPT control with only DC-Link voltage control of the grid-connected inverter. In order to allow MPPT control without the characteristic information of the wind turbine, the P&O algorithm is applied, and these are verified by the simulation and experiment.
박민기 ( Min Gi Park ),이지현 ( Ji Hyun Lee ),김성준 ( Sung Jun Kim ),박수호 ( Su Ho Park ),박석기 ( Suk Ki Park ),최준설 ( Joon Sul Choi ),황지연 ( Ji Yeon Hwang ) 영남대학교 의과대학 2017 Yeungnam University Journal of Medicine Vol.34 No.1
Gitelman syndrome is a condition caused by a mutation of the thiazide sensitive Na-Cl cotransporter gene on the distal convoluted tubule. It results in a variety of clinical features, including hypokalemia, hypomagne-semia, hypocalciuria, and metabolic alkalosis. It is often diagnosed in asymptomatic adults presented with unexplained hypokalemia; however, it is sometimes associated with muscular cramps, numbness, fatigue, weakness, or paralysis. We experienced a case of rheumatoid arthritis accompanied by Gitelman syndrome, presented with hand tremor. We diagnosed her using renal clearance study and genetic analysis. Here, we report our experiences regarding this case along with a literature review.
SMR 회로를 이용한 소형풍력발전 시스템의 센서리스 퍼지 MPPT제어
이준민(Joon-min Lee),박민기(Min-Gi Park),김영석(Young-seok Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.7
This paper proposes a low-cost switched-mode rectifier (SMR) for a small-scale wind turbine with a permanent magnet synchronous generator (PMSG) system. Also, a sensorless Fuzzy MPPT control is realized by the proposed system. In the PMSG system with the SMR, the synchronous impedance can be replaced as the input inductor of a boost converter. Moreover, the sensorless MPPT control using the Fuzzy technique is carried out by the duty-ratio regulation of the SMR. The relation between the generating power and the duty-ratio is ruled by the chain rule. The wind turbine model is implemented by the squirrel cage induction motor and generated the variable torque when the generator speed is varied. To verify the performance of the proposed system, simulation and experimental results are executed.
비상용 발전기 제어시스템의 배터리 충전기를 위한 고효율 LLC 공진형 컨버터의 연구
이준민(Joonmin Lee),박민기(Min-Gi Park),이용근(Young Keun Lee),나재두(Jae-Du La) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.10
Generally, the conventional battery charging system using an analog method has the large, heavy hardware and low efficiency. Also, it has the disadvantage that it is necessary to replace the control circuit on the basis of the characteristic curve of the specific battery cell. The proposed programmable digital LLC resonant charging system use high efficiency control system(CC-CV), and has characteristic a small hardware and advantage that a digital programming of the voltage, current, and battery capacity characteristics can be flexible. The system proposed the use of Half-bridge LLC resonant converter is possible to improve efficiency and reduce switching losses by using ZVS topology. Further, a constant voltage - constant current(CC-CV) control algorithm apply to the charger which using a buck converter. The performance of the proposed system is demonstrated through experiments.