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에너지 저장장치를 포함하는 자립 운전형 태양광 전력조절기의 제어특성 연구
김정환(Jeong-Hwan Kim),유권종(Gwon-Jong Yu),유병규(Byung-Gyu Yu),차한주(Han-Ju Cha),박종후(Joung-Hu Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In this paper describes control characteristics analysis of a stand-alone solar power controller has an energy storage system. Stand-alone solar power controller to control the input voltage output by the controller without the state fixed duty ratio limited by the limited duty ratio output states using the fixed to the stability of the system is analyzed. This method is used to control the power to change the output of limited duty ratio to check the status of the changes, and find the optimal value of operating reliably under any circumstances, is to design the controller. To determine the characteristics of this system was evaluated by simulation.
정수남(Sunam Joung),김정환(Jung Hwan Kim) 한국문화사회학회 2017 문화와 사회 Vol.23 No.-
본 논문은 중간계급 가정에서 자란 (잠재적)청년실업자를 중심으로 이들이 경험하는 방황의 성격과 그에 대응하기 위한 계급적 실천을 분석하는 데 목적을 두었다. 이를 위해 본 논문은 우선 최근까지 활발하게 진행되고 있는 청년세대의 문제를 세대론적 차원을 넘어 계급적 차원으로 확대하여 분석해야 함을 주장했다. 둘째, 연구대상자 청년들은 불확실성이 심화되는 후기자본주의체제에 적절하게 적응하지 못함으로써 대학진학 이후 현재까지 소모적인 방황기간을 오랫동안 거쳐 왔고 뚜렷한 삶의 목적과 직업관을 갖지 못했다. 그럼에도 불구하고 이들은 가족의 계급적 자원을 기반으로 불안과 불확실성에 대처해오면서 생계문제를 피해갈 수 있었다. 셋째로 이러한 생애과정을 거치면서 이들은 평범하게 살아가는 삶을 삶의 목표로 설정하고 있는데, 그 이면에는 미래전망이 불투명한 자신의 삶과 사회에 대한 깊은 냉소주의가 깊게 자리하고 있음을 알 수 있었다. 마지막으로 필자들은 청년세대는 자신의 계급적 상황에 따라 각기 다르게 불안에 대처하고 살아간다는 점에서 세대문제는 계급적 차원과의 연관 속에서 다루어져야 문제의 심연에 다가갈 수 있음을 강조했다. This article aims at analyzing some characters of wandering that potential youth unemployed have experienced and their class practice to cope with it. For this, first, we suggest that expanding to level of class beyond level of generation, problems of youth generation should be treated. Second, interviewee youth people didn’t cope with unstable post-capitalism appropriately and then couldn’t help undergoing the period of wandering long time after since 20’s. After all, now they have no clear objective of life and work ethic. Nevertheless they could avoid living matters by handling their anxiety and uncertainty on the base of class resource of family. Third, they try to set up goal of life as just living ordinarily. Above all, they have deeply cynicism about their own unstable lives and uncertain society without vision today. Lastly, we empathize that today problems around youth generation should be discussed in the relation to level of class in that they live differently for their class situation.
이민우(Min-Woo Lee),문정하(Joung-Ha Moon),김정환(Jeong-Hwan Kim),이현식(Hyun-Sik Lee),김전하(Jeon-Ha Kim),이영호(Young-Ho Lee) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
in this study, improvement endurance of N₂ generator, depend on finite element method and vibration test standard KR type approval because of ship in navigation, occurrence destruction ship's spare part reason of high risk vibration influence.
농업기계에 대한 인식도 : 농업계 고등학생을 중심으로 Focusing on the Agricultural High School Students
김정환,김민배 순천대학교 과학교육연구소 2001 科學과 敎育 Vol.9 No.-
The purpose of this study was to analyze the degree of an agricultural high school students’ recognition to the farm machinery according to their parent’s farming, sex, department and grade. This project surveyed 680 agricultural high school students at the jollanam-do. The data were analysed using SAS pc program. the major findings were as follows: 1. The degree of recognition to the farm machinery of paddy fields was high, but that to the farm machinery of livestock, up land fields and gorticulture was low. 2. The 31.6% of students showed dissatisfaction at the farm machinery. The first reason for this was that content of textbook was difficult and the second was that the number of the practice machine was little. 3. Concerning girl students’ reaction to farm machinery education, 50.2% students showed positive reaction. In the other hands, boy students showed more positive reaction than girl students.
김호수, 정희범, 김정환, 김재준, 김주환 청주대학교 2015 産業科學硏究 Vol.33 No.1
This study presents the experimental process to secure the tensile capacity of connection steel bar for form integrated insulation structure. To this end, this study evaluates the capacity and safety of connection steel bar through the bearing capacity experiment according to the various design variables. Through the results, we can find out that the length and joint type influence the tensile capacity of connection steel bar.
1-Hydroxy-7-octylphenazine의 합성과 그의 항균성
金鐘大,金正煥,宋炳洙 嶺南大學校附設 基礎科學硏究所 1982 基礎科學硏究 Vol.2 No.-
1-Hydroxy-7-octylphenazine was synthesized using borontribromide by the demethoxylation of methoxy group on the phenazine ring which was prepared by the condensation of 3,4-diaminooctylbenzene and pyrogallolmonomethylether. 3,4-Diaminooctylbenzene was prepared by the reducdtion of 3-nitro-4-aminooctylbenzene and pyrogallolmonometylether by the oxidation of o-vanilline (2-hydroxy-3-methoxybenxaldehyde). Surface tension of aqueous solution of this phenazine derivative was determined by Wilhermy model surfacetensionmeter. It was found that the surface tension of 1-hydroxy-7-octylphenazine solution was lowered to about 40 dyne/cm at 10-³mol/ℓ concentration, and its CMC (critical micelle concentration) was about 1.5×10-⁴M. Antimicrobial activity of 1-hydroxy-7-octylphenazine was also observed in this study. The identification of all the reaction products and structure determination of them were performed by melting point measurement and IR/NMR Spectroscopy.