3급 부정교합 환자에서의 치료후 골격변화 양상에 관한 연구

정동화,차경석 단국대학교 치의학연구소 1995 단국대치의학연구소논문집 Vol.7 No.1

유도전동기 드라이브 시스템의 고성능 벡터제어를 위한 PI 및 퍼지 제어기의 비교

정동화,이홍균 순천대학교 2000 순천대학교 자연과학논문집 Vol.19 No.1

For high performance induction motor drives such as mill drives, elevator, spindle drive, NC and so on, accurate position and speed controls are usually required. In high performance drives of induction motors, the position and speed controller usually undergoes a windup because of voltage limitation due to an inverter saturation. This paper is proposes the performance comparison of PI, antiwindup PI and fuzzy controller for high performance vector control of induction motor drive system. An antiwindup PI controller is proposed for PI controller considering inverter saturation. The performance of a fuzzy controller is compared with that of an antiwindup PI controller in an internal loop. The validity of the proposed technique is confirmed by simulation results for induction motor drive system.

Staphylococcus aureus에 대한 벌꿀의 항균 활성

정동현,백승화 한국식품영양학회 2002 韓國食品營養學會誌 Vol.15 No.2

본 실험은 벌꿀이 항균활성에 미치는 영향을 규명하기 위해 국내산 벌꿀인 밤꿀, 잡화, 아카시아, 재래종 벌꿀과 외국산 벌꿀인 마누카, 클로버, 캐놀라 벌꿀 그리고 인공벌꿀을 각각 12.5%, 25.0%, 50% 의 희석액으로 조제하여 catalase 무첨가 또는 첨가한 경우에 있어서 벌꿀의 Staphylococcus aureus에 대한 항균활성을 agar well diffusion assay로 비교한 바 다음과 같은 결과를 얻었다. Catalase 무첨가의 경우 12.5% 희석한 벌꿀은 마누카꿀> 밤꿀이, 25.0%로 희석한 벌꿀은 마누카 꿀> 밤꿀 > 잡화꿀 > 재래종꿀 > 클로버 꿀 > 아카시아꿀이 , 50.0%로 희석한 벌꿀은 마누카꿀 > 밤꿀 > 캐롤라꿀 > 재래종 꿀 > 잡화꿀 > 클로버꿀 > 아카시아 꿀 순으로 항균활성이 인정되었다 (p >0.01). Catalase 무첨가의 경우 12.5%, 25.0%, 50.0%로 희석한 벌꿀의 생육억제환은 각각 5.85 ~ 6.60 mm, 4.26 ~ 8.27 mm, 5.24 ~ 11.49 mm 범위였다. Catalase 첨가의 경우 12.5%로 희석한 벌꿀은 마누카꿀에서만 항균활성을 나타냈다. 25.0% 로 희석한 벌꿀은 마누카꿀이 밤꿀보다 항균활성이 더 높게 나타냈다 (p > 0.01). 50.0% 로 희석한 벌꿀은 마누카꿀 > 밤꿀 > 클로버꿀 > 캐로라꿀 > 재래종꿀 순으로 항균활성이 높았으며 마누카꿀, 밤꿀, 클로버꿀, 캐롤라꿀, 재래종 꿀 사이에서 유의성이 인정되었다 (p > 0.01). Catalase 첨가의 경우 12.5 %, 25.0 %, 50.0 %로 희석한 벌꿀의 생육억제환은 각각 5.89 mm, 5.01 ~ 6.84 mm, 3.10 ~ 8.28 mm 범위였다. This study examined for the investigation the effect of honey on antibacterial activity. The experimental honey were used the domestics, or chestnut honey, multiflower honey, acassia honey, native honey and the foreign, or manuka honey, clover honey, canola honey, and the artificial honey, made with the diluted solution of each 12.5%, 25.0%, 50.0%. The result of compared the occasion of added-catalase with not added-catalase about the honey's antibacterial activity on Staphylococcus aureus by agar well diffusion assay were as follows. When catalase was not added, manuka honey antibacterial activity was superior to chestnut honey's in the diluted honey of 12.5% and on the occasion of the diluted honey of 25.0%, it was approved in the order of manuka honey > chestnut honey > multiflower honey > native honey > clover honey > acassia honey and the occasion of the diluted honey > multiflower honey > native honey > clover honey > acassia honey and the occasion of the diluted honey of 50.0j% , it was approved in the order of manuka honey > chestnut honey > canola honey > native honey > multiflower honey > clover honey > acassia honey (p > 0.01). The clear zone representing inhibition of growth in diluted honey of 12.5, 25.0, 50.0 % with non-treat catalase ranged from 5.85 to 6.60, 4.26 to 8.27, 5.24 to 11.49 mm, respectively. When the catalase was added, antibacterial activity only showed in the manuka homey of 12.5% and on the occasion of the diluted honey of 25.0% manuka honey's antibacterial activity was superior to chestnut honey (Pp > 0.01). On the occasion of the diluted honey of 50.0 %, antibacterial activity was high in the order of manuka honey > chestnut honey > clover honey > canola honey > native honey (p > 0.01). The correlation was approved significantly among the manuka honey, chestnut honey, clover honey, canola honey and native honey. The clear zone representing inhibition of growth in diluted honey of 12.5, 25.0, 50.0 % with treat catalase ranged from 5.89, 5.01 to 6.84, 3.10 to 8.18 mm, respectively.

HAI를 이용한 IPMSM의 속도 추정 및 제어

정동화,이정철,이홍균 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

This paper presents hybrid artificial intelligent(HAI) controller based on the vector controlled IPMSM drive system. And it is based on artificial technologies that adaptive neural network fuzzy(A-NNF) is to speed control and artificial neural network(ANN) is to speed estimation. The salient feature of this technique is the HAI controller. The hybrid action tolerates any inaccuracies in the fuzzy logic assignment rules or in the neural network stationary weights. Speed estimators using feedforward multilayer and artificial neural network(ANN) are compared. The back-propagation algorithm is easy to derived the estimated speed tracks precisely the actual motor speed. This paper presents the theoretical analysis as well as the simulation results to verify the effectiveness of the new hybrid intelligent control

유도전동기의 파라미터 변동을 보상하기 위한 전압제어모델의 벡터제어

정동화 순천대학교 공업기술연구소 1992 工業技術硏究所論文集 Vol.6 No.-

For the propose of high performance operation of an induction motor, many studies on the vector control have been promoted. In the vector control scheme, in which the motor currents are controlled by the use of a motor current model, the variation of the rotor flux interlinkage and the deviation of actual torque from command torque, which are caused by the change of stator and rotor winding resistance, are large. Therefore, for high performance operation, it is necessary to compensate the variation and the deviation above. In the Voltage Model Vector Control System, where the voltages are controlled, the variation of the rotor flux-interlinkages according to the change of the rotor resistance is very small, however the deviation of the torque becomes large. In this paper, the voltage model based vector control scheme having d, q current loops eliminated harmonic components to enhance the torque performance and PWM technique to realize on-line real time control are proposed, so the full digitalization becomes possible.

위장질환과 Helocobacter pylori와의 상관관계

정동진,이정화,이상오,김재명,최태균 한국건강관리협회 1999 건협 Report Vol.2 No.-

3급 부정교합 환자에서의 치료후 골격변화 양상에 관한 연구

정동화,차경석 단국대학교 치의학연구소 1995 논문집 Vol.7 No.1

This study was investigated the changes during treatment and retention period in the Class Ⅲ malocclusion patients and explored the correlationship between factors that showed relapse tendencies and pre-treatment skeletal pattern and the changes during treatment period. Numbers of total sample were 24 and their Hellman's dental age at the start of treatment was over Ⅲ B and were retained at least over 1 year 6 months. The following conclusion were obtained by comparing the differences between treatment period and retention period, and after analysing the correlationship of factors that manifested relapse tendencies. 1. The angles formed by FH plane and occlusal plane, FH plane and mandibular plane, and mandibular incisor and mandibular plane changes showed rebound effect during retention period and among them occlusal plane angle and IMPA show reverse correlationship. 2. Upward displacement of the occlusal plane at the end of treatment has returning tendency, is proportional to the displacement during treatment period, but the angle between maxillary and mandibular 1st molar to its basal bone have been constantlsy maintained during the retention period. 3. Mandibular plane decrease during retention period and downward backward rotation during treatment period show correlationship.

토크 관측기에 의한 PMSM 서보 시스템의 고성능 벡터제어

鄭東和 순천대학교 공업기술연구소 1994 工業技術硏究所論文集 Vol.8 No.-

Recently, the elimination of position and speed sensors has been one of the important requirement in vector control system because the sensor spoil the ruggedness and simplicity of servo drive system. This paper proposes the position and speed sensorless vector control of PMSM servo system that provides high performance with disturbance torque observer. The sensorless servo system shows a tendency to become unstable by disturbance torques to the motor. This paper composed a disturbance torque observer and the motor current was compensated by the observed torque. The results obtained by PMSM servo system with disturbance torque observer are compared with those obtained by a sensorless servo system without the observer. These results predict the sufficient performance of the variable speed servo drive.

EKF를 이용한 유도전동기의 속도센서리스 백터제어

鄭東和,朴奎南 순천대학교 공업기술연구소 1994 工業技術硏究所論文集 Vol.8 No.-

In field oriented control of induction motors, speed sensor is required which reduces the sturdiness of drive system and together with the expenditure of hardware for faultless transmission and processing of sensor signals it causes considerable expenses. These expensive sensor can be replaced by speed sensorless concept. And for good control, the knowledge of the rotor flux component or the rotor resistance are needs. This paper is based on a extended kalman filter(EKF) that estimates the state variables that are required for the control by only measuring the line voltage and current of the machine The rotor resistance and speed estimated by the EKF shows satisfactory agreement with actual values with simulation.

유도전동기를 제어하기 위한 인버터의 공간벡터 퍼지제어

鄭東和,朴奎南 순천대학교 공업기술연구소 1998 工業技術硏究所論文集 Vol.12 No.-

A system with fast torque response is very beneficial in applications where direct self control(DSC) is highly desirable. The response of DSC is slower during startup and during change in command torque. Fuzzy control is used for implementation of DSC to improve its slow response. Simulation implementation of the fuzzy logic controller was carried out to verity the behavior of the controller. The simulation results with fuzzy control are compared with those of the conventional DSC. The starting flux and torque response and the responses to the step changes in command torque with fuzzy implementation show a considerable improvement over the conventional control. The steady state responses in both the cases are the same.