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전지용(Ji-Young Chun),전기영(Kee-Young Jeon),정춘병(Chun-Byung Chung),한경희(Kyung-Hee Han) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.12
본 논문애서는 부하전류의 급격한 변화에도 안정적인 출력진압을 얻기위하여 강압쵸퍼의 전압제어기를 개선하는 방법으로 부하전류 전향보상기를 제시하였다. 제시된 부하전류 전향보상기의 특성을 확인하기 위해 메이슨(Mason)의 이득공식을 이용하여 기존의 전압제어기가 포함된 전체 시스템의 전달함수와 부하전류 전향보상기가 추가된 전체 시스템의 전달함수를 각각 근궤적선도와 보드선도 상에서 비교하였다. 그 결과 시스템의 극점이 개선되고, 공진주파수에서의 첨두값의 크기 및 절점주파수의 위상여유가 양호한 것을 확인하였다. 따라서, 제시된 제어기법이 강압쵸퍼의 정상상태 및 동특성을 향상시키고 출력에 나타니는 외란에 의한 영향을 감소시킨 것을 확인할 수 있었다. In this paper, The author present a load current feed-forward compensator by method that improve voltage controller of Step-down Chopper to get stable output voltage to sudden change of load current. To confirm the characteristicsof a presented load current feed-forward compensator compared each transfer function of whole system that load cunent feed-forward compensator is added with transfer function of whole system that existent voltage controller is included using Mason gains formula in Root locus and Bode diagram. As a result the pole of system is improved, extreme point of the wave and system improves, and size of peak value and phase margin of break frequency in resonance frequency confirmed that is good. Therefore, presented control technique could confirm that reduce influence by perturbation and improves stationary state and dynamic characteristics in output of Step-down Chopper.
전지용 ( Ji-young Chun ),김근식 ( Keun-sik Kim ) 한국고등직업교육학회 2005 한국고등직업교육학회논문집 Vol.6 No.4
In this paper, the control algorithm of DC source device for inverter starting is proposed and the control method for compensating unbalance system source on operating time in the voltage type PWM converter with driving and regenerative faculty is suggested. The maintaining way of balancing condition for converter of AC source is used the compensating unbalanced status by current control loop. Because it is possible that the unbalanced System control is used to leakage transformer not equaled reactance by each phase in grid connected rectifier system, the proposed H/W and control algorithm of rectifier system is contributed to minimize of device and rising efficiency.
누설변압기가 부착된 전원 불평형 3상 전압형 PWM 컨버터 운전법
전지용(Ji yong Chun),김영춘(Young Chun Kim),조유환(Yu Hwan Cho),이근홍(Keun Hong Lee) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, the control algorithm of DC source device for inverter starting is proposed and the control method for compensating unbalance system source on operating time in the voltage type PWM converter with driving and regenerative faculty is suggested. The maintaining way of balancing condition for converter of AC source is used the compensating unbalanced status by current control loop. Because it is possible that the unbalanced System control is used to leakage transformer not equaled reactance by each phase in rectifier system, the proposed H/W and control algorithm of rectifier system is contributed to minimize of device and rising efficiency.
정춘병(Chun-Byung Chung),전지용(Ji-Yong Chun),전기영(Kee-Young Jeon),한경희(Kyung-Hee Han) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
In this paper, The author present a load current feed-forward compensator by method that improve voltage controller of Step-down Chopper to get stable output voltage to sudden change of load current. To confirm the characteristicsof a presented load current feed-forward compensator compared each transfer function of whole system that load current feed-forward compensator is added with transfer function of whole system that existent voltage controller is included using Mason gains formula in Root locus and Bode diagram. As a result the pole of system is improved, extreme point of the wave and system improves, and size of peak value and phase margin of break frequency in resonance frequency confirmed that is good. Therefore, presented control technique could confirm that reduce influence by perturbation and improves stationary state and dynamic characteristics in output of Step-down Chopper.
도시철도차량의 성능 향상을 위한 점착특성 기법에 관한 연구
김영춘(Kim, Young-Choon),전지용(Chun Ji-Yong) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.2
전기철도차량의 성능특성을 향상시키기 위한 효과적인 방법중의 하나는 바퀴와 레일사이의 점착성능을 향상 시키는 것이다. 점착특성을 연구하기 위해서 실제 차량을 등자 모델링한 점착시스템을 제작하였다. 이 시스템은 다양한 점착 파라미터를 변화시켜 바퀴와 레일사이의 점착력을 바꿀 수 있도록 제작되었다. 이 논문은 공전속도를 제어하는 기능을 추가하여 점착성능을 향상시키는 연구이다. It is one of the most effective methods for improving the performance of electric railway vehicles to make better the wheel-rail adhesion characteristics. To study adhesion characteristic is to develop the equivalent reduction machine to experiment on the adhesion system. The experiment system makes it possible to change the wheel-rail adhesion force with various adhesion parameters, and therewith to test the adhesion control system with the reduction machine in a laboratory. In this paper, for improving adhesion performance shows actually control methods.
박진영 ( Jin Young Park ),서중배 ( Joong Bae Seo ),전지용 ( Ji Yong Chun ),김명호 ( Myoung Ho Kim ),민상혁 ( Sang Hyuk Min ),이주홍 ( Joo Hong Lee ) 대한골절학회 2006 대한골절학회지 Vol.19 No.4
목적: Y형 금속판을 이용한 상완골 과간 골절의 치료에 있어서 치료의 결과와 그에 영향을 미칠 수 있는 요인을 조사하였다. 대상 및 방법: Y-형 금속판을 이용하여 고정한 상완골 과간 골절 환자 중 1년 이상 추시가 가능하였던 17예를 대상으로 하였다. C1형이 9예, C2형이 4예, C3형이 4예였다. 11예에서 다른 부위의 동반 골절이 있었다. 평균 연령은 48.8세였으며, 평균 추시 기간은 33개월이었다. 평가는 Cassebaum 분류 (Cassebaum`s classification for elbow range of motion)와 Mayo Elbow Performance Score (MEPS)를 사용하였다. 결과: 주관절의 운동 범위는 평균 105도 (50∼150도)로 회복되었다. Cassebaum 분류에서 매우 우수 7예, 우수 1예, 보통 4예, 불량이 5예였으며, MEPS에서는 매우 우수 7예, 우수 7예, 보통 2예, 불량이 1예였다. MEPS상 보통 및 불량으로 평가된 3예 중 C3형이 2예였다. 수술 후 결과에 큰 영향을 미칠 만한 합병증은 없었다. 결론: 상완골 과간 골절에서 Y-형 금속판을 이용한 고정은, 환자의 선택이 적절히 이루어진다면 좋은 치료 방법이 될 수 있을 것으로 생각된다. 결과의 영향을 미치는 요인으로는 골절의 관절내 분쇄 정도라 생각되며 고 에너지 손상 여부 및 연령도 결과에 다소 영향을 미칠 것으로 생각된다. Purpose: To evaluate the results of the treatment of intercondylar fractures of the humerus using Y-plate. Materials and Methods: The subjects were 17 patients with intercondylar fracture of humerus who were treated using the Y-plate. Nine cases were C1 type, 4 were C2 type, and the remaining 4 were C3 type. 11 subjects had accompanying fractures of another part of the body. The average age was 48.8. The average follow up period was 33 months. We used Mayo Elbow Performance Score and Risborough-Radin`s rating score for each patient as the methods of rating. Results: The average range of motion of the elbow was 105 degrees (50∼150 degrees). According to Cassebaum`s classification for elbow range of motion, 7 cases were rated very good, 1 cases were good, 4 cases were fair, and 1 cases were poor. According to Mayo Elbow Performance Score, 7 were excellent, 7 were good, 2 fair, and 1 poor. Of the 3 patients who were fair or poor in Mayo Elbow Performance Score, 2 were type C3 fractures, and all 3 had major accompanying fractures. No significant postoperative complications developed in all cases. Conclusion: The fixation with Y-plate can still be a relatively good modality of treatment for interconylar fractures of the humerus in selected cases, in spite of the known mechanical weakness of the Y-plate. The patients with severe intra-articular comminution showed relatively poor results. And we think that the age of the patient and the energy of the injury have more or less influence on the results of treatment.
이득 및 위상여유 규격을 만족하는 강인한 PID 제어기 설계
김근식 ( Keun-sik Kim ),전지용 ( Ji-young Chun ) 한국고등직업교육학회 2005 한국고등직업교육학회논문집 Vol.6 No.4
Modem control design methods show that sets of stabilizing controllers are first determined and then a controller is selected to meet given performance requirements among them. Although a modem controller is elegant control synthesis techniques but it usually results in a high order solution comparing to plant order. It has been reported that more than 95% of controllers loops in the industry are controlled by low order controllers such as PID. Recently, for a given LTI system, the complete set of robust stabilizing controller was obtained as a linear programming problem using Generalized Hermite-Biehler and Generalized Kharitonov theorem by Ho. This paper presents the determination of robust PID controllers satisfying given gain and phase margin specifications by using Generalized Kharitonov theorem and Nyquist stability conditions. It is illustrated by examples.