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金七龍 건국대학교 1979 論文集 Vol.10 No.1
This experiment was conducted to determine the optimum application amount of N. P. K Fertilizer to rice in different soil series in four areas of Kyung but province for two years in 1976-1977. The result was as follows. 1.The productivity of paddy soil was the highest in the ordinary paddy field, next to poor drainage paddy soil, sand paddy soil next to paddy soil developed on the Tertiary strata in turn. 2.The effect of nitrogen to rice was high at any paddy soil, that of phosphorus was so at the paddy soil developed on the Tertiary, and that of potassium was acutely responded in poor drainage paddy soil. 3.By the response surface equation, the optimum application amount of nitrogen was higher in the sandy percolated paddy soil, that of phosphorus was so in the paddy soil developed on the Tertiary and poor drainage paddy field, and that of potassium was so in the prior drainage paddy soil. 4.When potassium was applied alone or potassium and phosphorus were applied to rice under Non-nitrogen cultivation, rice yield was lower then non-fertilizer cutivation in some experimented paddy field, and between ratio of yield reduction and ***** ratio leas shown a negative correlation. 5.At the result of tracing direct effects among fertilizers by path coefficient analysis. The effect of nitrogen was high in the ordinary paddy soil, that of potassium was so in the prior drainage Paddy soil, that of phosphorus was so in the paddy soil developed on the Tertiary. In other factors except N.P.K. the contribution rate to the yield was high in the paddy soil developed on the Tertiary, next to poor drainage paddy field, sandy percolated paddy soil, next to the ordinary paddy soil in turn. 6.Between synthetic effect of fertilizer and direct effect of respective factor leas high correlation , however, between synthetic effect of fertilizer and indirect effect of respective factor was no significant. 7.Between the synthetic effect of fertilizer (x) and amount of application by response surface equation (y) was related to the following formula "y=4,063+0,218x". From the formula the optimum application amount of feritilizer was induced to the table # 12. 8.The method of determine the optimum application of fertilizer by synthetic effect of fertilizer is thought a very reasonable one, becouse it contains the aspect of quantity and balance.
새로운 능동 클램핑방식을 이용한 연료전지용 DC-AC 인버터의 특성
김칠용(C.Y. Kim),조만철(M.C Cho),문상필(S.P. Mun),김영준(Y.J. Kim),Mutsuo Nakaoka,김홍삼(H.S. Kim) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.11월
In the dissertation, a power conversion system for fuel cell is composed of a PWM inverter with LC filter in order to convert fuel cell voltage to a single phase 220[V]. In addition, new insulated DC-DC converters are proposed in order that fuel cell voltage is boosted to 300[V]. In this paper, it requires smaller components than existing converters, which makes easy control. The proposed DC-DC converter controls output power by the adjustment of phase-shift width using switch S5 and S6 in the secondary switch, which provides 93-97[%] efficiency in the wide range of output voltage. Fuel cell simulator is implemented to show similar output characteristics to actual fuel cell. Appropriate dead time td enables soft switching to the range where the peak value of excitation current in a high frequency transformer is in accordance with current in the primary circuit. Moreover, appropriate setting to serial inductance La reduces communication loss arisen at light-load generator and serge voltage arisen at a secondary switch and serial diode. Finally, TMS320C31 board and EPLD using PWM switching technique to act a single phase full-bridge inverter which is planed to make alternating current suitable for household.
김칠용(Chil-Yong Kim),문상필(Sang-Pil Mun),조만철(Man-Chul Cho),서기영(Ki-Young Shu),권순걸(Soon-Kurl Kwon) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.5월
For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. The absence of switching devices makes systems more tolerant to over -load, and brings low radio noise benefits. We propose a power factor correction scheme using a LC resonant in commercial frequency without switching devices. In this method, It makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence, the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh orders are much reduced. The result are confirmed by the theoretical and expermental implementations.
김칠용(C. Y. Kim),문상필(S. P. Mun),김영문(M. Y. Kim),김해재(H. J. Kim),류재엽(J. Y. Lyu),김수욱(S. W. Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This research presented the new zero-current switching pulse width modulation SEPP(Single Ended Push-Pull)high frequency inverter for solving the problem of the zero-current SEPP high frequency inverter circuit which is using widely in the practical application of an induction heating apparatus, the soft switching operation and power control are impossible when the lowest power supply in the zero-current switching pulse width modulation SEPP high frequency inverter. The inverter circuit which is attempted by on-off operation of a switch has the reduction effect of the power loss due to a soft switching and a high frequency switching. And it confirmed that the power regulation is possible continuously from 025[㎾] until 2.84[㎾] in the case the duty rate(D) changes from 0.08 to 0.3 under zero-current switching operating by a dissymmetry pulse width modulating control and the power conversion efficiency comes true the efficiency of 95[%]. Doe to the result above, the ZCS PWM SEPP high frequency inverter will be effective as sources of an induction heating apparatus.
새로운 유도가열용 ZCS PWM SEEP 고주파 인버터의 특성
김칠용(C. Y. Kim),문상필(S. P. Mun),김영문(M. Y. Kim),김해재(H. J. Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
This research presented the new zero-current switching pulse width modulation SEPP(Single Ended Push-Pull)high frequency inverter for solving the problem of the zero-current SEPP high frequency inverter circuit which is using widely in the practical application of an induction heating apparatus, the soft switching operation and power control are impossible when the lowest power supply in the zero-current switching pulse width modulation SEPP high frequency inverter. The inverter circuit which is attempted by on-off operation of a switch has the reduction effect of the power loss due to a soft switching and a high frequency switching. And it confirmed that the power regulation is possible continuously from 0.25[㎾] until 2.84[㎾] in the case the duty rate(D) changes from 0.08 to 0.3 under zero-current switching operating by a dissymmetry pulse width modulating control and the power conversion efficiency comes true the efficiency of 95[%]. Due to the result above, the ZCS PWM SEPP high frequency inverter will be effective as sources of an induction heating apparatus.
The Voltage-fed High Frequency Resonant Inverter Using Induction Heated Dry Steam Generator
Chil-Ryong Kim(김칠용),Jong-Kurl Lee(이종걸),Sang-Hwa Jung(정상화),Sang-Pil Mun(문상필),Sang-Don Kim(김상돈),Mutsuo Nakaoka 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
This paper presents an innovative prototype of a new conceptual electromagnetic induction-based fluid heating appliance using voltage-ted type series capacitor-compensated load resonant high-frequency IGBT inverter with a phase-shifted PWM and a power factor correction schemes. Its operating characteristics in steady-state are illustrated including unique features and evaluated on the basis of its computer simulation and experimental results of 10kw breadboard appliance for hot water producer and superheated steamer. The promising cost effective inverter-fed boiler appliances lor electromagnetic induction-heated type fluid-heating in the pipeline systems are proposed for induction-heated boiler, super heat steamer, high temperature water producer, hot gas producer and metal catalyst heating tor exhaust gas cleaning in engine, which are more suitable and acceptable for industrial, chemical, and censurer energy utilization for household and business from a practical point of view.
문상필,김칠용,권순걸,서기영,Mun, Sang-Pil,Kim, Chil-Ryong,Kwon, Soon-Kurl,Suh, Ki-Young 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.5
본 논문에서는 일반적으로 사용되어지는 배전압 단상 정류회로에 LC 공진회로를 첨가하여, 고조파의 성분을 저감시키는 고역률 단상 정류회로를 제안하였다. 제안한 회로는 다이오드 브리지에 병렬로 커패시터를 접속하고, 입력에 인덕터L을 추가하여 접속시키므로써 상용주파수에서 LC 공진현상을 이용하여, 수동소자만으로 입력전류를 정현파화한다. 그리고 고조파 제어 규제값의 여유도 만족시킨다. 이 모든 사항에 대해 실험과 시뮬레이션 결과를 비교, 분석을 통하여 그 타당성을 확인하였다. We propose a power factor correction scheme using a LC resonant circuit in commercial frequency without switching devices. In this method, It makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence, the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh orders are much reduced. The result are confirmed by the theoretical and experimental implementations