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차동욱,소순열 전북대학교 농업과학기술연구소 1999 農大論文集 Vol.30 No.1
There are quite a few inner factors in the development of agricultural management ; such as, family labour, the size of management scale, the money, the art of production and cultivation, the ability of manager, and so forth. In the past, the first and second factors were very important, but nowdays the fourth and fifth factors are gradually becoming more important. It is very important to improve the general factors for the development of on agricultural manger's ability, The aim of this study is to search for the significance of an agricultural manager's ability, its influence on agricultural management, and also to recognize ways of improvement. I will research this study about according to the following criteria: 1. What is the aim and necessity of this study about an agricultural manager's ability? 2. What is an agricultural manager's ability? (this is an partial approach to the theoretical process) and what is the general factor determining it ? 3. The conclusion of this study. According to comparative analysis of a sample-average of common agricultural farms, large-scaled farm's factoral scores are on an average of 88, whereas normal-scaled farm's factoral scores are on an average of 63. The managers of large-scaled farms had higher educations and their average age was 46. The size of an agricultural field is about 19.36ha, and the income from it is about \182,000,000. Each factoral scores gained from total sum of large-scale farm's agricultural managers are gaining relatively high scores in creativity, flexibility, sense of figures, compared with any other agricultural manager's factoral scores. Therefore, in order for an improvement in factors, agricultural manager's ability must be developed more effectively.
Cha, Min-Ah,Shin, Changhak,Kannaiyan, Dinakaran,Jang, Yoon Hee,Kochuveedu, Saji Thomas,Ryu, Du Yeol,Kim, Dong Ha Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.39
<P>Hybrid titanium dioxide (TiO<SUB>2</SUB>) nanostructures with engineered morphologies were produced by a simple synthetic approach based on cooperative sol-gel chemistry and self-assembly of amphiphilic poly(styrene-<I>block</I>-ethylene oxide) (PS-<I>b</I>-PEO) block copolymer (BCP) <I>via</I> spin-coating common solutions of BCP and inorganic precursors. TiO<SUB>2</SUB> nanostructures with two extreme reverse morphologies, <I>i.e.</I>, TiO<SUB>2</SUB> dot-in-PS matrix and PS dot-in-TiO<SUB>2</SUB> matrix, were obtained by increasing the volumetric ratio of the TiO<SUB>2</SUB> sol-gel precursor from 10 to 50 vol%. Incorporation of silver nitrate into the TiO<SUB>2</SUB> matrix afforded a hybrid Ag/TiO<SUB>2</SUB> thin film with hexagonally packed arrays of PS nanodots. Upon removal of the PS-<I>b</I>-PEO template from the initial hybrid films by UV treatment, inorganic nanostructures having the same lateral morphologies as the initial films were derived. Among the structures investigated, the Ag/TiO<SUB>2</SUB> mesoporous film exhibited the best photocatalytic performance. The surface/internal morphology and the mechanism of structural evolution were investigated by atomic force microscopy (AFM), transmission electron microscopy (TEM), and grazing-incidence small-angle X-ray scattering (GISAXS).</P> <P>Graphic Abstract</P><P>TiO<SUB>2</SUB> and Ag/TiO<SUB>2</SUB> nanostructures with engineered morphologies and enhanced photocatalytic properties were produced by a cooperative sol-gel chemistry and block copolymer self-assembly. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b907922j'> </P>
위상변환장치를 이용한 새로운 배전변압기 무정전 교체벙법
신동열(Dong-Yeol Shin),김숙철(Suk-Cheol Kim),윤기갑(Gi-Gab Yoon),차한주(Han-Ju Cha) 한국조명·전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.10
전력 소비자들에 의한 전기품질 요구 수준이 날로 높아지고 있어 배전변압기 교체시 발생되는 정전에 의한 소비자들의 블편을 줄이기 위한 선진국형 무정전 배전변압기 교체방법이 요구되고 있다. 현재 시행되고 있는 주상변압기 무정전 교체공법은 변압기 이용률과 현장여건에 따라 1-2차를 고압 바이패스하는 방법이므로 작업공정이 불편하고, 편법작업에 의한 고장발생과 이에 따른 작업자 안전사고가 발생하는 문제점이 있어 새로운 무정전 교체방법이 절실히 요구되고 있다. 따라서 본 논문에서는 새로운 위상변환장치를 이용한 무정전 공법을 제안한다. 제안된 무정전 공법은 기존의 고압 바이패스 작업방법에 비해 작업공정을 줄이면서 안전하고 저렴한 방법으로 변압기 교체를 할 수 있다. 그러므로 본 논문에서 제시한 공법은 배전공사 원가 절감에 따른 전기요금 하락과 무정전 전력공급으로 국민생활에 편리함을 더하고 국가 경제 발전에 기여할 것으로 기대된다. Nowadays, the power quality issue becomes very important in the electric distribution system Especially, when a distribution transformer is replaced, the customers who are supplied electricity from the transformer feel inconvenience due to electric outage. Therefore, an advanced method for the distribution transformer replacement without outage is strongly required. The conventional method is the primary-secondary high voltage bypass method according to the transformer utilization factor and the field condition. But it is inconvenient and has some problems such as breakdown and security troubles of the workers according to the unauthorized and temporary work. Therefore, the new scheme for the replacement with uninterruptable power supply is demanded. This paper proposes the new replacement method using the phase converter. The proposed method can reduces the process of replacement work and also ensures worker's safty. Therefore, the method is reasonable in comparison with the conventional method. The proposed method is able to contribute the national economy growth and elevate the convenience of national life by uninterruptable power supply.
배전계통에서 변압기 결선에 의한 역 조류현상에 관한 연구
신동열(Dong-Yeol Shin),하복남(Bok-Nam Ha),정원욱(Won-Wook Jung),차한주(Han-Ju Cha) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.9
본 논문에서는 최근 분산전원 확대보급에 따라 계량오차 발생, 변전소 CB 또는 Recloser, 수전설비 VCB의 OCGR 오동작, 배전자동화 시스템 거짓FI 정보발생 등 한전 배전계통에서 발생되는 오동작 현상에 대해서 원인분석을 수행하였고 그 원인은 변압기 결선에 의한 역 조류현상임을 규명하였다. 이러한 역 조류현상의 영향으로 배전 계통의 3상 기본파 전류가 N상에서 동상이 되어 3배의 전류로 합산되었으며, 이 현상을 근거로 새로운 계통해석 방법을 제시하였다. 새로운 계통해석 방법을 적용하여 구간별 고장전류를 해석하였고, 역 조류현상 규명을 위해 변압기 결선형태 별로 역 조류 발생여부를 실험하였다. 또한 PSCAD/EMTDC로 실제 계통을 모의함으로써 역 조류에 의한 오동작 현상을 줄이기 위한 방법으로 중성선의 영상임피던스를 조절하는 방법을 제시하였다. As the penetration of distributed generation systems is recently high, there have been metering errors, trips of protective devices in KEPCO distribution systems including an occurrence of false fault-indicator in distribution automation system. The cause of malfunctions was the reverse-tower-flow phenomenon due to transformer wiring types. By the effect of the reverse-power-flow, each of phase's fundamental currents was added by about 3 times on the neutral line. A new method based on the analysis of the reverse-power-flow is proposed in this paper. Fault currents on each section were analyzed by the proposed method, and the effect of types of transformer wiring was examined experimentally. In order to reduce the malfunctions due to the reverse-power-flow, controlling the zero-sequence impedance of transformer was designed and verified by using PSCAD/EMTDC software.
Effect of Compost Application Level on Seedling Growth of Panax ginseng C. A. Meyer
Byeong-Yeol Yeon,Dong-Yun Hyun,Geun-Su Hyun,Chun-Geun Park,Tae-Soo Kim,Seon-Woo Cha,Sung-Woo Lee 한국약용작물학회 2007 한국약용작물학회지 Vol.15 No.2
Good quality seedlings produced in the seedbed of Yangjik, traditional seedling cultivation, is one of the most important factors in determining the yield and quality of 4~6-year-old ginseng. This study was carried out to substitute Yacto, traditional organic fertilizer, for economical compost in the cultivation of seedling by fertilizing relatively little amount of compost into seedbed soil. Bulk density and solid phase were decreased in physical properties of seedbed soil, while air phase and porosity were increased by more addition of compost. When the amount of applied compost in seedbed soil was above 8l per Kan, the contents of nutrient were exceeded the range of optimal standard for ginseng cultivation. Chlorophyll content and stem length were increased by more addition of compost, while the length and the width of leaves showed the highest value at the application level of 8l per Kan. Heat injury was also increased distinctly above the application level of 8l per Kan. The number of first grade seedlings and usable seedlings, and fresh root weight per plant showed the peak at application level of 8l per Kan, respectively. Fertilizing the compost of 8l per Kan into seedbed soil was the optimal amount for producing the good quality seedlings.