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진화전략과 상태 관측기에 의한 영구자석 동기전동기의 센서리스 속도제어기 설계에 관한 연구
손문경,이동희,오석규 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6
Permanent magnet synchronous motor is widely applied for the industrial and home appliance because of it`s high power density and easy control. Recently sensorless speed control of PMSM is much studied because a mechanical sensor reduces reliability and increases cost. This paper investigates sensorless controller design of PMSM. Angular speed and position are estimated with observer. In order to reduce variation effect of mechanical parameters and calculation delay, reduced order state observer is designed with electrical parameters. Evolution strategy is used to optimize controller gains and observer eigenvalue. In the sensorless control of PMSM with state observer, eigenvalue affect stability and dynamic response of system,. The simulation and experimental results indicate good performances.
손효성,오창근,김문범,이재봉,장호선,권경술 대한피부과학회 2003 대한피부과학회지 Vol.41 No.6
Trichorhinophalangeal syndrome(TRPS) typeⅠis characterized by sparse and slow-growing hairs, pear-shaped nose, elongated philtrum, thin upper lip, and bone deformities, especially, cone-shaped epiphyses of the phalanges. The syndrome is inherited in an autosomal dominant manner. We report a case of TRPS typeⅠ with alopecia like male pattern baldness and Perthes-like changes on the right hip joint. (Korean J Dermatol 2003;41(6) : 801~804)
상태관측기를 이용한 영구자석 동기전동기의 센서리스 속도제어
손문경,이동희,오석규 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6
Sensorless PMSM is much studied for the industrial applications and home appliances because a mechanical sensor reduces reliability and increases cost. This paper investigates a field oriented control method without speed and rotor position sensor using the state observer. The observer is based on the model of the motor represented in the stationary two-axes coordinates. The control strategy is to estimate back-EMF by the state observer and to estimate the rotor speed and the rotor position angle from the estimated back-EMF. And we construct back-EMF constant compensator to compensate estimated speed error due to detuned electrical parameter. The observer is tested by simulation and experiment. The results show that the observer gives a good estimation of speed and rotor position, compensated parameter constants. The simulation and experimental results indicate good performances.
水耕栽培시스템의 傅熱特性 및 養液冷却이 作物體溫에 미치는 效果
孫禎翼,金文基,南相運 서울대학교 농과대학 농업개발연구소 1992 서울대농학연구지 Vol.17 No.2
The purpose of this study was to make clear the heat transfer characteristics and effect of cooling the nutrient solution on the plant temperature during summer season in hydroponic culture system. Heat balance equations of plant and nutrient solution in hydroponic culture system were theoretically established and verified with experimental results. The following results were obtained. : 1) the conductive heat transfer through planting board and partitioning material occupied the most part of total heat transfer; more insulated and lower conductive material are required to reduce the cooling load of nutrient solution effectively. 2) plant temperature of leaf lettuce were dropped by 0.6℃(average) and l.5℃(maximum) with the nutrient solution cooling of 6℃, and by about 3℃ with sunlight shading of 50%; the successful hydroponic culture would be possible even during summer season, provided cooling the nutrient solution with simultaneous use of both ventilation and sunlight shading.
원예치료 및 미술치료가 학교 부적응 청소년의 자아개념 향상에 미치는 영향연구
손기철,엄수진,배혜진,조문경,은옥주,최외선 충북대학교 한국과학재단 지정 첨단원예기술개발 연구센터 2002 연구보고서 Vol.6 No.-
본 연구는 원예치료와 미술치료가 학교부적응 청소년의 자아개념, 내적 통제력, 불안감소에 미치는 영향을 조사하고자 실시되었으며, 그 결과는 각 치료의 효과성이 비교·분석되었다. 인천 남구에 위치한 W공업고등학교에서 대조군 15명, 원예치료군 15명, 미술치료군 15명을 주 2회씩 2001년 9월 27일부터 12월 13일까지 원예치료군에는 원예치료 프로그램을 미술치료군에는 미술치료프로그램을 실시하였다. 원예치료 및 미술치료는 각각 전문 치료사에 의해서 행해졌다. 원예치료 및 미술치료 프로그램의 효과를 알아보고자 자아개념(Self-Concept Scale), 내적 통제력 척도(Inner-Control Scale), 특성불안 척도(Trait-Anxiety Scale)을 각 프로그램의 실시전과 실시후로 조사하여 비교하였다. 원예치료군에 있어서는 자아개념척도 중 자아수용, 성격적 자아, 총 자아 긍정 항목에서 통계적으로 유의한 향상을 보였고, 특성불안척도에서는 우울 및 불안 항목에서 매우 유의한 감소를 나타내었다. 한편, 미술치료군에 있어서는 내적통제력과 특성불안척도중 자신감이 유의하게 향상된 것으로 나타났다. 이상의 결과를 종합하여 볼 때, 원예치료군은 프로그램 과정중 자기표현의 기회를 제공함으로써 자아개념이 향상되었으며, 또한, 공동작업을 하는 집단 프로그램을 통하여 내면의 불안과 갈등이 완화되었다고 판단된다. 반면, 미술치료군은 치료자와의 개인적인 상담과정을 통하여 내면의 불안과 갈등이 완화되었고, 지점토 및 칼라믹스 만들기 등 활동적인 프로그램을 통하여 내면의 감정을 통제하는 능력이 향상되었다고 판단된다. This study was conducted to evaluate the effect of HT (horticultural therapy) and AT (art therapy) on the changes of self-concept, inner control, trait anxiety of the school maladjusted adolescents. 45 school maladaptive of teenage students participated in therapy program at the W high school were randomly assigned to 3 groups: 15 for the horticultural therapy, 15 for art therapy, 15 for control group. The program were carried out from Sep. 27 to Dec. 13, 2001 as an activity group. Activity group attended twice a week for 1 hour. For evaluation of the effectiveness of each therapy, Self-Concept Scale, Inner-Control Scale, Trait-anxiety Scale were used 2 times, that is, before/after HT or AT program. According to the results, self satisfiction, personal self, and total positive self items among Self-Concept Scale were significantly improved, and tension and anxiety item among Trait anxiety Scale were significantly decreased in HT group. On the other hand, in AT group, both inner control and self confidence item in Trait-anxiety Scale were significantly improved. In conclusion, in HT group it was suggested that the improvement of self concept could be brought about by being provided the chance of self expression during program and the alleviation of inner anxiety and discord resulted from group therapy program in which joint work have been provided. In case of AT group, it was logically postulated that the alleviation of inner anxiety and discord resulted from personal counselling with AT therapist during program and the improvement of inner control was caused by active program such as painting paper clay, making color mix, and etc.