Digital Converter로 구동되는 크레인용 직류전동기 속도제어 시스템의 안정도 해석

변성태,김종훈,정태동,구태만 울산대학교 1996 공학연구논문집 Vol.27 No.1

크레인 구동용으로 antiparallel converter의 반도체 전력회로에 마이크로 제어기를 사용한 직류전동기의 속도제어 시스템에 대한 안정영역을 해석한다. 먼저 불연속 전류인 경우 converter의 비선형특성으로 인하여 전동기 속도제어 능력이 저하되므로 이를 보상하는 방식을 제안한다. 이 converter와 직류전동기를 포함한 전체 속도제어 시스템을 이산형 상태방적식으로 모델링 한 후, 각 제어기 이득에 대한 안정영역을 해석한다. The stability regions for microcontroller-based dc motor speed control system driven by antiparallel converter, which has been used as the crane drive, are analyzed, first as the performance of motor speed control is deteriorated due to nonlinear characteristics of the converter in the discontinous current state, the method to compense for nonlinear characteristics of the converter is suggested. The overall dc motor speed control system including the converter and dc motor is represented by a discrete-time state equation, and then the stability regions for gains of controllers are dervied.

비선형 현가요소를 가진 철도차량의 승차감 민감도 해석

탁태오,김명훈 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

In this study, ride sensitivity analysis of train with non-linear suspension elements is performed. Non-linear characteristics of springs and dampers for primary and secondary suspensions of a train is parameterized. Equation of motion of the train model is derived, and using the direct differentiation method, sensitivity equations are obtained. For a nominal ride quality performance index, sensitivity analysis with respect to various design parameters regarding non-linear suspension parameters is carried out.

공구 수명의 신뢰성 예측 프로그램 개발

이수훈,김봉석,강태한,송준엽,강재훈,서천석 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

This paper deals with a prediction method of tool life in view of the reliability assessment. In this study, the flank wear was studied among multi-factors deciding the tool wear state. Firstly, tool life was predicted by correlation between flank wear and cutting time, based on the extended Taylor tool life equation of turning data, including parameters of cutting speed, feed rate, and cutting depth. Secondly, each of cutting conditions of endmilling was equivalently converted to apply ball endmill data to the extended Taylor equation. The web-based reliability prediction program for tool life is being developed as one of reliability assessment programs to for the machine tools.

透明標本을 利用한 根管 充塡方法의 比較

郭泰德,曺圭澄,曺光憲 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1

The purpose of this study was to examine the influeace of root canal sealer and the method of canal filling on the quality of canal obturation. Eighty extracted human maxillary anterior teeth were selected and divided into lateral condensation group and vertical condensation group, and each group was subdivided into Coenogenol group and AH26 group. The obturated teeth were immersed in 2% methyllene blue dye, decalcified and cleared. The degree of dye penetration and morphology of filling material were observed by streozoom-microscope. The result were as follows: There was no singnificant difference between lateral condensation group and vertical condensation group in the degree of the dye penetration. There was no significant difference between Coenogenol and AH26 group in the degree of the dye penetration. The vertical condensation group in the frequency of filled accessary canal was superior to the lateral condensation group. In comparing roots with leakage vs roots without leakage, Coe nogenol group showed significant lower incidence of leakage than AH26 group. Transparent specimen was superior to the other methods in detecting of frequency of acessary canal, incidence of filled accessary canal, distribution of sealer, depth of dye penetration.

運動負荷前後 肥滿女中生의 血中 Glucose, Insulin 및 Apolipoprotein 代謝變化

김태운,신군수,김종인,이광무,김성헌,안병철,고기준 釜山大學校 附設 體育科學硏究所 1994 體育科學硏究所 論文集 Vol.10 No.-

The purpose of this study was to determin a study on the change of blood glucose, insulin and apolipoprotein metabolism before and after maximal exercise in obese middle School girls. The subjects were included 2 groups (each group n=6) : obese group, non-obese group. The measurement variables were blood glucose, insulin and apolipoprotein before and after maximal exercise. The conclusion of this study was as follows: 1. Changes in glucose 1) Obese group had no significant differences by maximal exercise. 2) Non-obese group has been increased significantly by maximal exercise (P<.05). 3) No significant difference was found between two groups. 2. Changes in insulin 1) Obese group had non-obese group had no significant differences by maximal exercise. 2) Obese group has been increased significantly when comparing with non-obese group (P<.05). 3. Changes in apoliporprotein 1) Two groups in Apo-AI has been increased significantly pre and post maximal exercise(P<.05). 2) No significant difference on Apo-AI was found between two groups. 3) Obese group and non-obese group in Apo-B had no significant differences by maximal exercise. 4) No significant difference on Apo-B was found between two groups.

비만 여중생과 정상 여중생의 혈중지질 비교분석

김태운,신군수,김종인,이광무,김성헌,안병철,고기준 釜山大學校 附設 體育科學硏究所 1995 體育科學硏究所 論文集 Vol.11 No.-

The purpose of this study was to analyze and identify the serum lipids of the middle school girls in order to utilize them as the basic data for the prevention of the middle school girls against arteriosclerosis and diabetes tending to lower age. We used total of twelve middle school girls as subject and devided them into two groups : obese group(n=6), normal group(n=6). The measurement items were the Total-cholesterol, HDL-cholesterol, LDL-cholesterol, TG, FFA. The conclusion of this study was as follows : 1. Total-cholesterol 1) All two groups was a little increased by maximal exercise, but there was no significant difference statistically. 2) Normal group was a little higher than obese group, but there was no significant difference. 2. HDL-cholesterol 1) All two groups was a little increased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, normal group was a little high on empty stomach and obese group was a little high before and after exercise, but there was no significant difference. 3. LDL-cholesterol 1) All two groups was a little increased on post-exercise than pre-exercise, but there was no significant difference statistically. 2) In comparison of two groups, normal group was a little higher than obese group, but there was no significant difference. 4. Triglyceride 1) All two groups was a little increased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, normal group was a little higher than obese group on empty stomach and obese group was a little higher than normal group on pre and post-exercise, but there was no significant difference. 5. T-chol./HDL-chol. 1) All two groups was a little increased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, normal group was a little higher than obese group, but there was no significant difference. 6. Free Fatty Acid 1) All two groups was a little decreased by maximal exercise, but there was no significant difference. 2) In comparison of two groups, obese group was a little higher than normal group, but there was no significant difference.

고압상평형 측정을 위하여 미량시료채취법에 의한 분석방법 연구

변헌수,김태규,곽철 여수대학교 1996 論文集 Vol.10 No.-

In order to plant design of supercritical separatation process, the high pressure phase equilibrium data are essential. In analysis method, the phase equilibria data of each phase by the microsampling technique were analyze by gas chromatograhpy in microsampling with heavy molecular weight. The calibration results of vapor and liquid phase sampling loop were presented 26.4㎕ and 22.7㎕, respectively. In this work, the RRF(relative response factor) on the tetralin, α-tetralone and α-tetralol were showed 1.87, 1.60 and 1.65. Using the calibrated valve, obtained the high pressure phase equilibria and mixture density data of the vapor and liquid phase.

초임계 이산화탄소내에서 방향족탄화수소와의 삼성분계 혼합물에 관한 기액상평형

최태현,변헌수 여수대학교 1998 論文集 Vol.11 No.2

The high pressure vapor-liquid equilibrium data are essential in order to separate the mixture of toluene and p-xylene with supercritical carbon dioxide. The circulation type vapor-liquid equilibrium apparatus has been used during this research to get ternary data of toluene, p-xylene and carbon dioxide system. The ternary phase liquid-vapor equilibria of carbon dioxide, toluene and p-xylene were measured for pressures ranging from about 26 bar to the 100 bar at 100℃. The liquid phase composition of carbon dioxide and the sum of vapor phase compositions of toluene and p-xylene are increased as the pressure is increased.

FMEA를 이용한 기계류 시스템의 신뢰도 분석

진도훈,우태수,이치우 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-

This paper dealt with FMEA, which is a method of the analysis to secure safety and confidence coming up to customers' expectation in consideration of the environment of the corporation, the industrial environment, and the functional improvement. And by using FMEA, We showed the example analyzed the confidence of the Air Supply System. It was proved by the result of the analysis that the rate of the breakdown which is usually regarded as the first important point to reform can't satisfy the selecting basis to improve. Also the result said that it is not right to depend on only the rate of the failure in making the list of the reform. Through the analysis of the breakdown, FMEA can present the important factors of the reform to improve the confidence of the system. In this study would show the important factors of the improvement in order to product the goods guaranteed confidence through the method of FMEA.

제조에 對한 文獻的 考察

안태규,최병렬,송기철,이용연,유화승,서상훈,최우진,조정효,이연월,손창규,조종관 대전대학교 한방병원 2001 惠和醫學 Vol.10 No.1

In the literatual study on Holotrichia, the results were obtained as follows ; 1. Holotrichia is larva of Holotrichia diomphalia Bates etc. powder or liquor of Holotrichia is used medically. 2. Appearance of Holotrichia is shape of kidney, yellowish color. 3. The oriental characters of Holotrichia is warm, toxicant, salty. 4. The significant efficancy of Holotrichia is breaking the stagnant blood. 5. Holotrichia can be applied to the diseases related to thrombosis, and recover the demage of liver. 6. Holotrichia avails Liver diseases such as Hepatitis, Liver cirrhosis, Hepatosplenomegaly, Hepatoma etc.