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정승기(Seung-Gi Jeong),김경수(Kyung-Su Kim),최준영(Jun-Young Choi),오시덕(Si-Doek Oh) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
A linear generator driven by a hydrogen combustion engine has been developed. Unlike rotary engine-generator systems, the linear counterpart is inherently unable to start by itself unless external force is provided for initial compression/ignition cycle. When the generator is connected to utility power lines through a bidirectional power conversion system, however, the self start-up can be done by driving the generator as a motor. This paper introduces a prototype 1㎾ linear hydrogen engine-generator system being developed and shows the self start-up is possible with proper motoring mode.
정승기(Seung-Gi Jeong),김경수(Kyung-Su Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
A linear generator driven by hydrogen (or other kind of fuel) cumbustion engine requires special consideration for starting because of its none-conventional way of operation. This study investigates the possibility of replacing mechanical (hydraulic) start-up with electrical motoring. Simulation study based on 1 ㎾ prototype system shows that the mover position of a linear generator can be controlled with a proper current control of power converter.
정승기(Seung-Gi Jeong) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Recently, multilevel H-bridge inverters have become more popular in medium to high power ac drive applications. One of significant advantages of them is low harmonic contents in their input line currents thanks to the transformer with multiple phase-shifted secondary windings. This paper attempts to provide basic guidelines for the design of the phase shifting transformer windings and theoretical analysis of input line current harmonics.
발열(發熱)에 관(關)한 문헌적(文獻的) 고찰(考察) -(황제내경(黃帝內經)을 중심(中心)으로)-
권현,정승기,이형구,Gyun, Hyun,Jeong, Seung-Gi,Lee, Hyeong-Gu 대한한방내과학회 1990 大韓韓方內科學會誌 Vol.11 No.1
We objerved the following results from The Yellow Emperior's Canon of Internal medicine through the investigation of literature about fever. 1. Fever is divieded two type asthenic fever sthenic heat and It accused two type of excess of Yang-exoganous heat, deficiency of Yin-internal fever 2. The cause of fever is divieded three type, exoganous cause, internal cause non-exoganouse and internal cause Among the cause of fever Exoganous cause is almost affected by cold-evil Internal cause is affected by deficiency of Yin and seven emotion caused by having sex after intoxigation or over-exertion, and non-exoganous and internal cause bring about the difference of a personal life and food and drink 3. The sympton produced by fever is appeared differently through-pulse and meridian and they are indication of Diagnosis 4. The theory of treatment about fever are as follows Drinking cold-water Practising acupuncture Trerating hot-evil by cold Dispel cold by warm Treating cold-evil by heat Promote vital energy circulation by cold Treating warm-evil by cold Promating circulation by cold Treating cold-evil by warm Promoting circulation by heat.