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릴레이 직/병렬 연결에 의한 절연형 가변 충전기 병렬운전
강성구,김승애,이승열,박성준 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
본 논문에서는 배터리의 다양한 용량 및 전압 사양을 만족시킬 수 있는 배터리 충전기의 개발을 목적으로 한다. 이를 위해 3상 AC전원을 입력받아 정류기를 거친 DC전압을 Buck converter를 통해 출력을 제어하고, L-C 직렬공진 형태의 트랜스를 통한 6채널의 출력을 릴레이의 직/병렬 연결에 의해 가변적인 배터리 충전이 가능하게 하였다. 또한 각 충전장치의 병렬운전을 위해 Master가 되는 장치의 출력에 따라 Slave가 되는 장치가 동일한 출력을 추종하여 병렬운전을 가능하게 하였다. 이와같은 구조의 검증 및 타당성을 확인하기 위하여 13.5㎾급의 단위 충전장치 병렬운전 시뮬레이션을 수행하였다.
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제주 친환경 감귤 농업 발전을 위한 사례연구 - 한농대 졸업생 농가를 중심으로 -
강성구,김종숙,Kang, S.K.,Kim, J.S. 국립한국농수산대학교 교육개발센터 2014 현장농업연구지 = Journal of practical agricultural resear Vol.16 No.1
The purpose of this research is to find what difficulties the agricultural successors, the Korea National College of Agriculture and Fisheries (KNCAF) graduates, face with in implementing eco-friendly agriculture in Jeju, and what solutions they can be provided with. This research, a case study on the basis of open-ended survey questions, has 6 cases out of 8 graduates who have or had implemented eco-friendly citrus farming. In Jeju, 24 graduates have involved in citrus farming. According to the case study, only one case was environment-friendly farming method at the pesticide-free level, and the others at organic farming level. All the cases have tried to alter main crops or to diversify management for coping with global climate change and market-opening. On analyzing operating cost to gain product of merchantable quality, it revealed that the environment-friendly farming method needs much more managing efforts than the conventional farming does. But to the contrary, the materials cost in the environment-friendly farming method was lower than in the conventional farming method. In the total production and the price, the environment-friendly farming was 20~50% lower and 10~50% higher than the conventional farming, respectively. Difficulties which the graduates confronted with in implementing the environment-friendly agriculture are as below. Firstly, many of the difficulties have resulted from lack of the environment-friendly farming techniques, and the high cost of farm scale improvement due to high price of land and topographical features of Jeju. Secondly, the agricultural successors, the KNCAF graduates, have trouble in obtaining approval of their parents to changeover from the conventional farming to the environment-friendly farming. Lastly, there is no advisory organizations and experts for environment-friendly farming in the given area. For shift to the environment-friendly farming, followings are needed. Agricultural Technology & Extension center, with cooperation of leading farms in environment-friendly farming, should have a key role in offering education and consults on the environment-friendly farming techniques. Also, this organization should inform rapidly the research results to the farmers, and their feed-back should be involved in the next research. Therefore, it is suggested that the forum called 'Environment-friendly Organic Farming Forum in Jeju' tentatively is organized.
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강성구 영남이공대학 산업기술연구소 2000 産業技術硏究 Vol.12 No.-
To synthesis p-aminobenzoic acid and formaldehyde, p-nitrotoluene(0.1 mole) and formaline(0.1mole) were condensed in water bath at 65℃ and cured at 165℃. The polymer was treated with 10% KMnO₄ aquos solution and Zn-HC1. The polymer was very viuscous, dark amber and the yied was more than 65%.
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p-Aminobenzenesulfonamide와 formaldehyde의 중합체에 관한 연구(Ⅰ)
강성구 영남이공대학 산업기술연구소 1996 産業技術硏究 Vol.9 No.-
p-Aminobenzenesulfonamide and formaldehyde were condensed in aquous solution. It melt near 100℃ partially soluble in polar wolvent and the yield of polymer was more than 80%.
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강성구,신진희,송상욱 대한의학회 2010 Journal of Korean medical science Vol.25 No.8
Worry is a generalized psychological phenomenon seen among most people. When worry is excessive and nearly uncontrollable, people usually suffer psychological pain. The Penn State Worry Questionnaire for Children (PSWQ-C) was developed to measure worry objectively. It comprises 14 items for measuring excessive, generalized, and uncontrollable worry in children. This study, conducted with a large group of elementary children (3rd through 6th graders, ages 8-12 yr; N=973), investigated the reliability and validity of the Korean version of the Penn State Worry Questionnaire for Children (PSWQ-CK). The PSWQCK showed high reliability by test-retest and also excellent internal consistency results. To examine the validity of the PSWQ-CK, we calculated its correlation with the Revised Children’s Manifest Anxiety Scale (RCMAS). The PSWQ-CK had a higher correlation with the worry/oversensitivity factor than with other subscales of the RCMAS, and it showed no correlation with the lie factor. When 3 reversed PSWQ-CK items were eliminated, the instrument showed higher internal consistency. However, this did not improve its correlation with other anxiety-measuring tools. In conclusion, the PSWQ-CK’s reliability and validity were satisfactory, and it is a useful tool for objectively measuring the worry of Korean children of this age group.
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