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권혁운,최서익,김철우 부산대학교 생산기술연구소 2001 生産技術硏究所論文集 Vol.60 No.-
본 논문은 SRM의 회전자 위치 정보를 얻는 새로운 방법을 제시하였다. 회전자의 위치에 따라 인덕턴스가 변화함을 이용하며 비여자상의 펄스 전류, 펄스 전압를 측정하고 인덕턴스를 측정하여 위치를 예측한다. Micro-processor는 비여자상을 결정하고 테스트 결과는 SRM의 센스리스 제어가 가능함을 보여주고 있다. This paper describes a new methods of detecting rotor position in SRM (switched reluctance motor). A low-cost position-sensing scheme using stator inductance measurement is presented in this paper. An analog electronic technique can be applied to measure the inductance of a nonconducting phase by measuring phase current and pulse voltage. Micro-processor is decided to the nonconducting phase. Test results show that this technique is a possible approach to detect the rotor position of an SRM.
권혁진(Kwun Hyuk Jin),최윤수(Choi Yun Soo),지종덕(Ji Jong Duck) 한국지적학회 2004 한국지적학회지 Vol.20 No.2
The purpose of this study is to analyze the difficulties of plan for solving cadastral mismatch and suggest a method which can help to achieve it efficiently and successfully. After reviewing related studies and analyzing successful cases about cadastral mistch problems, following problems were recognized : first, the limitations of legal foundation, second, the subject in charge of budget and method for supplying it, and third, resident agreement such as monetary accounts caused by increase and decrease of area. The solution can be suggested as follows First, a legal reorgnization should be considered which can be consistent and flexible. Second, special organization should be established which will take exclusive charge of the related projects and, Third, an alternative actions should be taken for the prevention of expantion of cadastral mismatch. 본 연구는 지적불부합지 정리사업의 난점을 분석하여 효율적이고 성공적으로 추진할 수 있는 방안을 제시하는 것이다. 관련 논문 및 자료 등을 통한 이론연구와 과거 지적불부합지 정리사업의 성공사례 등을 분석한 결과, 지적불부합지 정리사업의 당면과제는 첫째, 지적불부합지 정리사업을 위한 법률적 근거의 부족, 둘째, 사업에 소요될 재원의 부담 주체와 조달에 관한 문제, 셋째, 면적증감에 따른 금전청산등 주민합의에 관한 문제 등으로 도출되었다. 그 해결방안으로서 일관된 유연한 관련법령정비와 지적불부합지 정리사업을 전담할 전문기구의 설립, 그리고 지적불부합지의 예방을 위한 체계적인 대책수립 등을 제시하였다.
Kyu Hyuk Kwun,Geun-Joong Kim,신현재 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.3
This study assesses the use of ultrasonication to improve the extraction process of classical solvent extraction methods for extracting isoflavones from the kudzu roots waste. The kudzu roots waste was produced after squeezing fresh kudzu roots to make juice. The effects of extraction time, extraction temperature, ultrasonic power, and ethanol concentration in ethanol/ water mixtures were investigated. The extraction yield was found to increase with extraction time and temperature. The application of ultrasonication-assisted extraction (UAE) increased the extraction yield of water/ethanol mixture (20:80) at 25°C 3 fold. A maximum amount (7.28 g) of isoflavone was obtained from 100 g of dried kudzu roots waste by UAE with water/ ethanol mixture (20:80) for 6 h at 80°C. Combining the use of ultrasonication with conventional vacuum evaporation method also reduced the concentration time for extracts from 45 to 24 min