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반송장치에서의 방향제어를 위한 DC모터와 STEP모터 제어기의 성능비교에 관한 연구
한기수(Ki-Soo Han),원성홍(Sung-Hong Won) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.1
영구자석의 반발력을 이용한 반송장치에서 캐리어를 받아 다음 스테이션으로 방향을 전환해주기 위한 회전판의 제어를 수행하기 위한 제어기로서 적당한 모터의 선정을 위하여 두 가지 형태의 제어기를 만들고 이를 비교하여 최적의 제어기를 선정하고자 하였다. 즉 스텝모터를 사용한 마이크로스텝방식의 오픈루프 제어와 DC모터를 사용한 폐루프 제어방식의 DC서보 방향제어기를 설계하고 제작하였다. 이 두 방식의 방향제어기의 성능과 제어특성을 비교하였다. This paper presents the design and implementation of direction controllers by microstep control and dc servo control for material transport system. The perfomances of direction control systems are compared in position responses and motor power consumptions between microstep control of a step motor and dc servo control.
운동기구를 이용한 풀다운 운동시의 에너지 하베스팅에 관한 연구
한기수(Ki-Soo Han),배재남(Jae-Nam Bae) 대한전기학회 2016 전기학회논문지 P Vol.65 No.2
This paper deals with Energy Harvesting using a part of physical energy which is generated by pulldown actions. From a point of energy harvesting view, though it is difficult to regenerate constant energy during pulldown exercise unlike cyclic exercise and running machine exercise, it is possible to regenerate some energies to charge batteries for mobile phones. To investigate possibility of energy harvesting during pulldown exercise, a voltage regulation experiment was performed with a converter circuit and a motor which is attached to the exercise equipment. And we conclude that energy harvesting is possible although its small quantity during pulldown exercises.
자전거 거치대 잠금장치의 부하시 효율개선을 위한 구동모터성능비교에 관한 연구
한기수(Ki-Soo Han),원성홍(Sung-Hong Won) 대한전기학회 2013 전기학회논문지 P Vol.62 No.4
This paper presents the design and implementation of a Bicycle Locker System. Generally DC motor has been used to control a Bicycle Locker System, but DC motor system requires frequent maintenances and its power efficiency is comparatively poor especially under heavy load conditions. In order to improve this difficulties, this paper adopts BLDC motor for a Bicycle Locker System and its motor controller is developed. The performances of locker units are compared between DC motor unit and BLDC motor unit. The motor power consumptions between two motors are discussed. Test results verify that power efficiency of the suggested BLDC drive unit is considerably improved compared to the DC drive unit with load condition.
100 gm 경구 당부하검사 결과 하나만 비정상을 보인 임신의 양상
한기수(Ki Su Han),양성천(Seong Cheon Yang),김행수(Haeng Soo Kim),양정인(Jeong In Yang),이희종(Hee Jong Lee),임재현(Jae Hyun Lim),임윤경(Yun Kyoung Lim),오기석(Kie Suk Oh) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.10
Objective : To evaluate the clinical outcomes of pregnancies showing one abnormal glucose tolerance test value. Method : We performed 50 gm glucose challenge test in 5,019 pregnant women at 24-28 weeks of gestation. In 1,170 women with plasma glucose levels over 130 mg/dL, 100 gm oral glucose tolerance tests (OGTTs) were performed at 28-32 weeks of gestation. In the 888 cases who were followed up, according to the National Diabetes Data Group (NDDG) criteria, 122 cases with one abnormal 100 gm OGTT value were divided into three groups (groups 1, 2, 3 : abnormal value after 1, 2, 3 hours, respectively). These were compared with 577 cases (control group) with normal 100 gm OGTT value, retrospectively. Result : The incidence of one abnormal glucose tolerance test value was 2.6%, and there were no cases where the fasting plasma glucose level only was elevated. The incidence (control, group 1, group 2, group 3 : 19.4%, 43.8%, 25.7%, 29.6%) of poor maternal outcomes which contain any one of preeclampsia, hydramnios, cesarean delivery for cephalopelvic disproportion or failure to progress or fetal distress was highest in group 1 (p=0.025). The incidence (15.8%, 43.1%, 14.3%, 21.1%) of poor perinatal outcomes which contain any one of fetal distress, Apgar score of 5 minute < 7, hypoglycemia, respiratory distress syndrome, small for gestational age, perinatal death was also highest in group 1 (p=0.009). Logistic regression analysis for poor maternal outcomes showed odds ratio of 2.83 (95% confidence interval 1.02-7.87) in group 1 and 2.08 (95% confidence interval 1.22-3.55) in group 3, and for poor perinatal outcomes odds ratio of 4.24 (95% confidence interval 1.02-17.52) in group 1 and 3.30 (95% confidence interval 1.45- 7.48) in group 3. Conclusion : Pregnancies complicated with one abnormal glucose tolerance test value, particularly the group showing abnormal glucose tolerance test value after 1 or 3 hour exhibited adverse maternal and perinatal outcomes.
심한 요통과 급성 양하지 마비증상으로 나타난 복부 대동맥 폐쇄증 - 증 례 보 고 -
김래상,한기수,이언,박철완,김영보,이상구,김우경,유찬종,Kim, Rae Sang,Han, Ki Soo,Lee, Uhn,Park, Chol Wan,Kim, Young Bo,Lee, Sang Gu,Kim, Woo Kyung,Yoo, Chan Jong 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.1
Acute intraabdominal aortic obstruction ends in progressive fatal course or severe permanent disability unless it is diagnosed and treated promptly. However, the incidence of such disease is very rare, so there is very little chance for a neurosurgeon to encounter a patient with acute intraabdominal aortic obstruction. The authors present a case of 62-year-old man with severe low back pain and acute paraplegia caused by acute intraabdominal aortic obstruction.