유도 전동기를 위한 자기 동조 퍼지 제어기 설계

전광호,하남수,박준열,김상윤 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2

The conventional PI control, that are used in the control loop for outer speed of the induction motor, also has difficulty dealing with the dynamic speed tracking, parameter variation, and the load disturbance. As a result, the motion control system operates with a poor performance in the motor´s low speed range. In this paper, a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. The proposed FLC used the speed error, its rate of change, and the drive current as three fuzzy variables. The real command output current is chosen by the defuzzification of the fuzzy output extracted from the fuzzy control rules. The flux and the torque of the induction motor are estimated using the dynamic model with an excellent dynamic response over a wide speed range and with the rotor flux field-oriented scheme of the decoupling characteristics. The performance of this control system is substantiated by computer simulations.

속도 센서가 없는 유도 전동기의 퍼지 제어 방법에 대한 연구

全光鎬,朴俊烈 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.2

In the vector controlled induction motor drives which are widely used in recent years, the speed information becomes mandatory. However, installing the speed sensors on the existing motors costs much, and is not easy under certain environment. In addition, several sensor noise can happen to make the wide applications of the high performance vector controlled induction motor drives restricted. In this paper, we propose fuzzy control algorithem for control torque of induction motor without speed sensor. The prorosed controller shows a good dynamic response and decoupling characteristics.

트립토판 중합효소 알파 소단위체의 in vitro 구조재형성시 Ca^2+과 Mg^2+이온의 단백질 응집체 형성 촉진 효과

천광호,김종원,신혜자,임운기 부산대학교 유전공학연구소 1999 분자생물학 연구보 Vol.15 No.-

The effect of cations on the formation of protein aggregates was examined by in vitro refolding of mutant tryptophan synthase α-subunit in which Pro 24 was replaced by Leu. NH^+_4, K^+ and NA^+ had no effect, but Mg^2+ and Ca^2+ stimulated the formation of protein aggregates in dose-dependent manner. It is suggested that Mg^2+ and Ca^2+ may be implicated in the formation of protein aggregates in vivo.

실리콘 웨이퍼 공정용 알루미나 정전척의 제작과 특성에 관한 연구

천희곤,조동율,이영섭,박용균,최성호,정광진,Serguei Spoutai 울산대학교 기계부품 및 소재 특성평가연구센터 1999 연구보고서 Vol.1999 No.-

정전척의 유전체 물질로 열전도도와 유전특성 그리고 기계적 특성이 우수한 알루미나에 TiO₂첨가하여 유전체의 비저항을 변화시켜서 정전척(electrostatic chuck)에서 발생하는 정전력인 쿨롱힘(coulomb force)과 존슨-라벡힘(Johnsen-Fahbeck firce_의 영향을 규명하려 하였다. 그리고 비저항, 인가전압, 온도, 습도가 정전력에 어떠한 영향을 주는지 고찰하였으며, 인가전압에 따른 응답 특성에 관하여 고찰하였다. Alumina electrostatic chucks for silicon wafer process with wide range of electrical resistivity were fabricated by controlling the amount of TiO₂ addition (0 wt%, 1.3 wt%, 2 wt%, 2.8 wt%). The dependence of electrostatic force on applied voltage, temperature and humidity was investigated. In addition, response characteristics on applied voltage and relationship between electrical resistivity and electrostatic force characteristics such as Coulomb force and Johnsen-Rahbeck force were discussed

우리나라 논 관개용 지하수 수질 특성

김진호,조광래,임수정,이경자,경기천,엄미정,김희권,김찬용,이영한,이신찬,윤순강 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4

This study was carried out to evaluate the status of the groundwater quality for paddy fields irrigation in Korea. Water samples were collected at 130 sites throughout the country. Samples were collected at three seasons-April, July and October-in 2000. According to our survey, the groundwater was found to be suitable for irrigation purpose. Average EC was shown 0.286 dS/m. Nitrate-nitrogen and Cl^(-) concentration was 5.6 ㎎/L, 32.95 ㎎/L which satisfied the Korean Standards for Irrigation Water. Nitrate-nitrogen concentration in each province was shown as following orders: Jeju (11.17 ㎎/L) > Chungnam (8.16 ㎎/L) > Gyeongbuk (6.64 ㎎/L) > Gyounggi (5.91 ㎎/L) > Chungnam (4.95 ㎎/L) > Gyeongnam (3.91 mgk) > Jeonbuk (3.50 ㎎/L) > Jeonnam (3.27 ㎎/L) > Gangwon (2.91 ㎎/L). The concentration by sampling seasons were October (6.62 ㎎/L) > July (5.88 mg&) > April (4.78㎎/L). As the soil of Jeju Province is usually derived from volcanic ash soils mainly used for upland drops, it may influence the nitrate-nitrogen concentration of groundwater. The amount of rainfall also influence the water quality. But the COD_(Cr), were shown April (3.17㎎/L) > July (2.91 ㎎/L) > October (2.40 ㎎/L), it is highly related in the basal dose of organic matter fertilizers. This study demonstrated that groundwater quality was suitable for irrigation, but continuous monitoring is recommended for agricultural policy and developing OECD agricultural environment indicators.

전격성 경과를 취한 만성 호산구성 폐렴 환자 1예

윤호상,진춘조,유광하,이상엽,이수인,정상만,김선두,이순제,이길도,전혜정 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-

Chronic eosinophilic pneumonia(CEP) is a rare disease of unknown etiology characterized by chronic infiltration of the lung with eosinophils. It presents with profound systemic symptoms comprising fever, night sweats, weight loss, dyspnea and blood eosinophilia with nonsegmental air-space consolidation confined to the outer third of the lung, the "photographic negative of pulmonary edema". Histopathologic features of chronic eosinophilic pneumonia are intraalveolar and interstitial infiltrations with eosinophils, histiocytes, giant cells, scattered lymphocytes and plasma cells. Glucocorticoid therapy cause prompt resolution of symptoms as well as disappearans of blood eosinophils, elevated serum Ig E levels and the roentgenographic lesions. Infrequent radiographic findings include nodular infiltrates, consolidations, cavitations, atelectasis and pleural effusions. Deaths from CEP although rare, have been reported, but the majorities of CEP have benign courses and do not need a therapy with ventilator. We report a case of chronic eosinophilic pneumonia, which had a sudden course associated with diffuse pneumonic consolidations on the both lung and bilateral pleural effusion.

남녀 중학생의 체육학습 태도에 관한 연구 : 인천광역시 소재 중학생 대상

김경호,김형룡,천광호 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.3

This research is designed to provide basically necessary for the sake of promoting the normalization of physical- education classes and shedding light upon the actual conditions of operating physical- education at school by making an analysis of middle-school boys and girls at school. 1. The understanding of the objectives of physical education. In regard to the enhancement of sociality, improvement of physical strength, understanding of exercise, function of exercise, one's health brought about by their physical education, boy-girl combined classes are more excellent than the rest, and as for the understanding of the pursuit of life, boys are better than girls. Concerning the understanding of exercise, physical education is said to be of help in the sequence of boy-girl separated co-ed schools. 2. The attitude of taking part in physical education activities. The survey has it that warning up and finishing exercise are sincerely practiced, While students are little impressed by the safety of facilities and instruments in the physical-education classes, both boys and girls are highly satisfied with the explanations and demonstrations of physical education teachers. 3. The attitude of tolerating the evaluation of physical education, Students say that they are under a lot of notice in the beginning of each term, which is designed to let them enhance the justice and confidence of the evaluation of practical training, and that they are not satisfied with a variety of evaluation and the evaluation of practical training in the field of physical education.

초등학생의 Dental IQ 수준과 구강보전 관리실태

김광덕,전진호 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.2

Objectives : Oral health care program for the elementary school children (ESOHCP) should be met the first priority because dental caries are highly sensitive and prevalent among them. This study was performed to enhance the efficiency of ESOHCP, and their oral health promotion. Methods : The Subjects were 346 students (3rd grade 163, 6th grade 185) of one elementary school in Busan. Dental IQ and actual oral health status; the decayed, mixing and filling teeth were checked through questionnaire and oral health examination from April to June 2002. Dental IQ was presented out of one hundred, and data analysis was done using SAS (ver 8.1) program. Results : The students' cognitive level about the causative and preventive factor of dental caries was relatively high. However, the practical aspects of preventive behavior - tooth brushing ; three times per day (20%), three minutes per time (22%), oral health examination ; one time per three months (10%) left much to be desired. And, only 27% of the subjects had experienced in school oral health education. The mean level of dental IQ was 79 out of 100, and 51% and 42% of them had the decayed and teeth with filling, respectively, with the rate of DMFT 82%, DT 43%, FT 57%. The level of dental IQ was higher in case of having his (her) own tooth brush (p=0.072), standard tooth brushing (p<001); three times per day, post meal, three minutes per time, present experience of oral health examination (p<001) and dental clinic visit (p<001). The grade of caries was more serious in case of 6th grade (p=0.059), an absence of his (her) own tooth brush (p=0.090), present experience of oral health examination (p=0.021), and an absence of regular dental clinic visit (p=0.003). The frequency of oral health examination (γ=0.620), tooth brushing; times per day (γ=0.445), post meal (γ=0.355), expending times per brushing (γ=0.352), right cognition to the treatment of caries (γ=0.401), positive attitude to dental treatment (γ=0.387), the frequency of dental clinic visit for the past one year (γ=0.152) showed significant correlation with dental IQ. In the multivariate analysis, dental IQ was influenced by the frequency of oral health examination, right cognition to the cause of caries, times of teeth brushing per day, right cognition to the treatment of caries, etc., with adjusted R2=0.857. Conclusion : Though the students' cognitive level about the causative and preventive factor of dental caries was high, the practical aspects of preventive behavior left much to be desired. And, the current ESOHCP considered to be still inefficient. However, frequent dental visits had apparent correlation with high level of dental IQ. The specialized and practical program should be needed for the efficient ESOHCP. Harmonized effort from educational, health and dental society is essential.

퍼지 PI 제어기를 이용한 유도 전동기의 속도 제어에 대한 연구

박준열,전광호 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

The conventional PI control, that are used in the control loop for outer speed of the induction motor, also has difficulty dealing with the dynamic speed tracking, parameter variation, and the load disturbance. As a result, the motion control system operates with a poor performance in the motor's low speed range. In this dissertation, a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. The proposed FLC used the speed error, its rate of change, and the drive current as three fuzzy variables. The real command output current is chosen by the defuzzification of the fuzzy output extracted from the fuzzy control rules. The flux and the torque of the induction motor are estimated using the dynamic model with an excellent dynamic response over a wide speed range and with the rotor flux field-oriented scheme of the decoupling characteristics. The performance of this control system is substantiated by computer simulations.

퍼지 논리 제어기를 이용한 유도 전동기 전류 제어에 대한 연구

崔洪圭,全光鎬,姜泰垠 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-

In this paper, we propose the control method of an inverter-fed induction motor using Fuzzy Logic Controller. The FLC chooses the switching states based on a set of fuzzy variables. Error in flux component magnitude of stator current error in torque component magnitude of stator current and flux position are used as fuzzy state variables. Fuzzy rules are determined by observing the vector diagram of flux and currents. The proposed controller shows a good dynamic speed response and decoupling characteristics. Moreover, since the rotor parameter has no effects on the performance the controller and the fuzzy controller possesses highly adaptive capability the performance of fuzzy controller is quite robust and insensitive to the motor parameters and change of operation conditions