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김갑기 木浦海洋大學校 1997 論文集 Vol.5 No.1
In this paper, to improve bandwidth of microstrip antenna, we discussed parasitic patch structure which coupled capacitively at radiating slot. To make it's size smaller, used antenna made by λ/4 short patch, not by λ/2. And size of ground plane is cut same that of patch. Also to improve bandwidth it has parasitic patch coupled with capacitive. Since ground plane is reduced, backward radiation is occurred. Characteristics of designed antenna is evaluated, based on transmission line model and aperture analysis method. And by computer program radiation pattern and return loss is evaluated. As a simulation results, backward radiation is - 15 dB. Bandwidth of designed antenna has 167MHz at resonant frequency 2.45 GHz, which is very broad, compare to current microstrip antenna. Therefore our antenna will be suitable for very wide bandwidth communications.
류동목,박기범,이상철,김여갑 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.4
Ossifying fibroma is a neoplasm representing one of the benign fibro-osseous lesions of the jaw. ossifying fibroma has been designated as a demarcated, occasionally encapsulated lesion consisting of fibrous tissue that contains variable amounts of mineralized material resembling abnormal bone or cementum-like tissue. most of them are solitary and show slow, often expansile growth centrally within the jaws and characteristrically behave in a benign fashion. But, rarely they occur as a multiple and in a gigantic form exhibiting an aggressive nature. We has a case of multiple ossifying fibroma showing rapid-growing behavior and sequential occurrence in all four jaw quadrants resulting in severe facial deformity and orbital compression. therefore such a rare case is reported here.
A Multiagent-Based Hybrid Power Control and Management of Distributed Power Sources
Gi-Gab Yoon,Won-Pyo Hong,Ki-Hong Lee 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.8
In this paper, a multi-agent control system for DC-coupled photovoltaic (PV), fuel cell (FC), ultracapacitor(UC) and battery hybrid power system is studied for commercial buildings & apartment buildings microgrid. In this proposed system, the PV system provides electric energy to the electrolyzer to produce hydrogen for future use and transfer to the load side, if possible. Whenever the PV system cannot completely meet load demands, the FC system provides power to meet the remaining load. A multi-agent system based-power management and control algorithm is proposed for the hybrid power system by taking into account the characteristics of each power source. The main works of this paper are hybridization of alternate energy sources with FC systems using long and short storage strategies to build the multi-agent control system with pragmatic design, and a dynamic model proposed for a PV/FC/UC/battery bank hybrid power generation system. A dynamic simulation model for the hybrid power system has been developed using Matlab/Simulink, SimPowerSystems and Stateflow. Simulation results are also presented to demonstrate the effectiveness of the proposed multi-agent control and management system for building microgrid.
윤기갑(Gi-gab Yoon),박영신(Young-shin Park),전동훈(Dong-hwoon Chun),박상호(Sang-ho Park),최영도(Young-do Choi),이희주(Hee-ju Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문에서는 저압배전계통에 연계되어 있는 분산형전원을 전원 측에 AC전원 모의 장치를 설치하여 순간전압강하, 순간전압상승, 고조파 주입 등 배전계통에서 일어날 수 있는 비정상 상태를 발생시켜 분산전원의 응동특성이 계통연계 기술기준에서 정한 규정치에 적합 여부를 파악하기 위하여 실증시험을 수행하고 그 결과를 분석하였다.
윤기갑(Gi-gab Yoon),박영신(Young-shin Park),전동훈(Dong-hwoon Chun),박상호(Sang-ho Park),최영도(Young-do Choi),이희주(Hee-ju Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문에서는 저압배전선로에 분산전원이 연계되었을때 나타나는 전압변동특성을 분석하기 위하여 고창분산전원 실증시험장에 설치되어있는 저압가변모의선로와 모터부하 및 분산전원을 적절히 조합하여 분산전원의 연계전후의 선로전압 변동특성을 분석하였다