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

디밍 안정기를 이용한 형광등의 퍼지 제어기 설계

崔洪圭,全光鎬,姜太垠,崔琁雄 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-

This paper proposes Dimming Ballast illumination control method using fuzzy reasoning the proposed method has the following effects. First the power saving above 50% is accompanied by the automatic control of the illumination and the choice of a turn-on or -off of a fluorescent lamps that is accompanied by the number of person and working time and weather Second the maintainment of the best illumination in spite of time and weather variation. Third More simple establishment and low than BAS(Building Automation System) because need not main control unit or communication cable

방울토마토중 Dichlofluanid 및 Iprodione의 생산단계별 잔류농약 경시변화

최규일,성기용,정태균,이주환,허장현,고광용,이규승 한국환경농학회 2002 한국환경농학회지 Vol.21 No.4

방울토마토의 생산단계에서의 잔류허용기준 설정과 수확후 저장기간중 경시변화 및 세척에 의한 잔류농약의 감소양상을 파악하였다. 해당약제를 안전사용기준의 기준량 및 배량을 각각 시설재배 포장에서 살포후 10일간 잔류양상을 조사하였고, 실온 및 냉장조건 하에서의 저장실험 및 세척에 따른 전류농약의 잔소량을 파악하여 생산단계부터, 출하, 저장, 소비단계까지의 잔류량을 예측할 수 있는 모델개발을 위한 자료로 이용하고자 연구를 수행하였다. Dichlofluanid와 iprodione은 포장조건에서 반감일수가 기준량 2.2, 3.3일 이었으며, 배량은 3.5, 5.4일로 나타났다. 저장조건하에서의 약제별 반감기는 포장조건보다 잔류량의 감소속도가 느린 것으로 나타나 반감일수가 증가하였고, 세척방법에 의한 잔류농약의 감소량을 조사한 결과 세제 사용시의 평균제거율은 dichlofluanid는 73.7%, iprodione은 64.3%로 나타났고, tap-water 사용시에는 dichlofluanid 73.5%, iprodione 63.5%로 나타났다. 이러한 결과는 작물의 생산단계에서 구한 합리적인 희귀식을 이용하여 잔류농약의 경시변화를 파악하고, 저장 및 세척과정을 거쳐 최종 소비단계에서의 잔류농약의 수준을 평가할 수 있었다. We studied the residual patterns of two fungicides, dichlofluanid and iprodione, in cherry tomato greenhouse after applying with the recommended and double dose. Also, the degradation patterns during storage periods of up to ten days were compared between at room temperature (20℃) and at cold temperature (4℃). Removal rates of fungicides by washing with tap-water and detergent solution (0.1%, 0.2%) were measured. Half-lives of dichlofluanid and iprodione in greenhouse cherrytomato were 2.2~3.5 and 3.3~5.4 days, respectively. During the storage period, the residues were dissipated more slow. Removal rates were 62.8~80.3% by tap-water, 60.4~83.1% by 0.1% detergent solution, and 65.3~77.6% by 0.2% detergent solution. So, we can predict of terminal residues from cultivation period to marketing, storage and consuming.

水稻突然變異系統의 農耕形質들의 遺傳力과 相關關係

崔光泰,韓相政 대구효성가톨릭대학교 1977 연구논문집 Vol.19 No.1

As a fundamental study of breeding procedures, several important characters and the variation in the interrelationship among these characters were studied. It was conducted with M₂rice mutants induced from mother variety, Poongkwang irradiated with -ray. Number of days from seeding to heading showed the higher value in heritability, while the value deceased with number of panicles, number of grains per panicle, and culm length, in order. Highly positive correlation between culm length and number of grains per panicle was found.

고추의 葯培養에 依한 Callus 및 胚狀體의 誘起

崔光泰 대구효성가톨릭대학교 1977 연구논문집 Vol.19 No.1

Anthers of Capsicum annuum were cultured on the modified Murashige and Skoog's medium supplemented with combinations of several growth regulators in order to establish an effective method of producing haploid plants. The observations of changes of anther color, mode of callus emergence, change of msicrospores, changes of somatic tissues of anther, and formation of haploid callus and embryoid originated from the microspore having relation to the different media and stages of anther were carried out. The results obtained were summarized as follows: The cultured anthers turned brown and dark brown, indicating a degeneration of anther tissue, about 35 days after culture. As late as 50 days after culture, the anthers unchanged in color were sometimes observed, and callus or embryoid was not derived from these unchanged ones. Calluses formed inside the anther locules were easily detachable by a slight touch, and an observation of sectioned anthers clearly revealed that the calluses were of micrespore-origin. Haploid calluses emerged from the anther locule later than the somatic callus, 16 to 70 days after culture, and most of them were formed 20 to 45 days after culture. The somatic calluses originating from the connective tissue, filament attachment, inner tissue of anther, and anther surface started to grow about one week after culture, and were not observed 30 days after culture. With regard to the parts they arose, about 76.3% of somatic calluses was derived from the connective tissue and anther surface. Anthers producing the haploid callus revealed non-cell division as well as callus development in the anther wall, connective tissues or in other parts of the anther. Embryoids usually emergen out of the anther olcules later than the calluses, 25 days after culture, and about 96% of them was formed 25 to 45 days after culture. Besides normal-looking embryoids various malformed-embryoids were observed. Embryoids were ontogenetically confirmed micrespore-origin. 2,4-D was effective in inducing haploid calluses. The best medium was the combination of 0.2㎎/ℓNAA, and 2.3㎎/ℓ BAP. The frequency of embryoid emergence from the znther locule was more or less similar among the media combined 2,4-D with other growth regulators. In the number of calluses developed from the connective tissue of filament attachment, the developmental stages of anthers gave no marked difference, Marked differences among stages were observed as to the callus occurring from the anther surface; the tetrad stage gave the greatest number of such calluses. Haploid callus and embryoid were induced more frequently when the anthers were induced more frequently when the anthers were at late uninucleate stage.

성인의 경부 전면 중앙부위에서 발생한 기형종 1예

최월용,정효진,채종인,하태인,정상렬,이광재,채병도,최영식 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

Teratomas are embryonal neoplasms that show characteristics of three germ cell layers(ectoderm, mesoderm, and endoderm). They are distributed in the following regions: sacrococcygeal(57%), gonadal(29%), mediastinal(7%), cervical(3%), retroperitoneal(4%), and intracranial(3%) regions. Non-gonadal treatomas present in infancy whereas gonadal are seen in adolescence. Especially, teratomas that occurred in midline neck of adult are very rare and are confused with thyroglossal duct cysts, cystic hygromas, and thyroid tumors. We report, along with the review of appropriate literature, a case of histopathologically confirmed benign teratoma in the midline neck of a 33 years old woman.

원자력 사고후 쌀알과 배추내 ^90Sr 및 ^137Cs 농도 예측

최용호,임광묵,황원태,이한수,이창우 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.3

원자력 사고후 시간경과에 따른 작물체내 핵종 농도를 보다 현실적으로 예측할 수 있는 방법을 수립하고 단위 건침적에 대하여 백미와 배추내 ^90Sr 및 ^137Cs의 50 년간 농도를 예측하였다. 비생육기 사고의 경우 농도는 두 핵종 모두 시간경과에 따라 서서히 감소하였고 50년 내내 ^90Sr이 ^137Cs보다 높았다. 생육기 사고의 경우 처음 1년간 농도는 비생육기 사고에 비해 대체로 ^90Sr은 최고 30 배, ^137Cs은 최고 1,000 배 정도까지 높았다. 50 년간의 누적농도는 백미에서는 비 생육기 사고의 경우 ^90Sr이, 생육기 사고의 경우 ^137Cs이 더 높았으나 배추에서는 어느 경우에나 ^90Sr이 더 높았다. 생육기 사고시 50년간의 누적농도에 대한 지배적 경로는 대체로 ^90Sr의 경우 뿌리흡수, ^137Cs의 경우 작물체 직접오염이었다. 재부유의 영향은 무시할 수 있을 정도였다. 예측 결과에 입각하여 사고 조건별로 대책의 방향을 제시하였다. A method of more realistically predicting radionuclide concentrations in crop plants varying with time after a nuclear accident was established to estimate 50 years' concentrations of ^90Sr and ^137Cs in polished rice seeds and Chinese cabbage for unit dry deposition. After non-growing season accidents, concentrations of both nuclides decreased gradually with time and ^90Sr concentrations were higher than those of ^137Cs throughout the whole period. Radionuclide concentrations in the 1st year after growing season accidents were on the whole higher than those after non-growing season accidents by factors of up to 30 for ^90Sr and up to 1,000 for ^137Cs. In polished rice seeds, the 50 years-integrated concentration was higher for ^90Sr than for ^137Cs after non-growing season accidents, whereas the opposite was true after growing season accidents. In Chinese cabbage, however, it was higher for ^90Sr than for ^137Cs after both types of the accident. Generally speaking, the dominant pathway for the integrated concentration after the growing season accident was root uptake for ^90Sr and direct plant contamination for ^137Cs. The effect of resuspension was negligible. Based on the predicted results, the direction of planning countermeasures was suggested for various accident conditions.

유도 전동기의 동특성 개선을 위한 퍼지 제어기 설계

최홍규,전광호,최병숙,강태은 홍익대학교 산업기술연구소 1998 産業技術 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 and 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 dufuzzification 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.

레이저 형광법에 의한 프로세싱 플라즈마중의 입자 계측에 관한 연구

최상태,이광식,하장호,전용우,박원주 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.2

Armorphous materials have various structures that is determined by different manufacturing conditions. That is, the photoelectric characteristics of films manufactured by different conditions are totally different. The growth mechanism of a-Si should be understood in order to controll the characteristics and structures of these kinds of materials. In this study, we try to elucidate the particle behaviours in a processing plasma using a low pressure glow discharge. And because of difficulties understanding discharge mechanism, we have done the processing so far depending on the experimental methods that compare the thin film produced by varing discharge parameter with the results of micromachinary. But, this has a limitation in the development because it regards the plasma as a blackbox. Therefore, because it needs to observe the discharge parameters and plasma background gas systematically, we try make sure that the particle behaviours be made clean by using laser fluorescence method which is predominant in a phenomina measurement and special resolution.

압자의 압입에 의한 치관 전장용 복합레진의 기계적 성질 평가

최원호,배태성,박광선,박종수 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.2

This study was performed to evaluate the mechanical properties of four commercially available veneering resin composites for crown (Dentacolor: DC, Artglass: AG, Esternia: ET and Targis: TG). According to the manufacturer's instructions, disc specimens were fabricated in a teflon mold giving 12mm in diameter and 1 mm in thickness. All specimens were immersed in distilled water at 37℃ for 30 days. An indentation test of 68-degree trigonal diamond pyramid was made under 98.06 mN load for 15 seconds. Hardness numbers, charateristic indentation depths, flow and permanent deformation were measured and compared statistically by ANOVA and Tukey's multiple range test. The results obtained were summarized as follows; 1.The highest hardness value of 87.4 was observed in the ET group and the lowest value of 11.8 was observed in the DC group. Hadness values showed no sinificant difference between the AG group and TG group, but others showed the significant difference beween groups (p<0.5). 2.Flow value of the ET group was significantly lower than those of the AG and TG groups of hybrid composite for crowns. 3.Percent strain during the indentation was the lowest in the DC group and the highest in the AG group, but there was no significant difference in each experimental group (p>0.05). 4.The relationship between the hardness number and flow during the indentation was a negative linear on a logarithmic scale.