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문종주(Moon, Jong Joo),유희총(Liu, Huai Cong),문상현(Moon, Sang Hyeon),김연호(Kim, Yeon ho) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
This paper investigates the safety states in two modes, Six Switch Open(6SO) and Three Phase Short(3PS), and describes the behavior of torque and current generated in each state. The transient state and steady state behavior of the current appearing in the active short circuit operation were analyzed. In addition, a conceptual design of a Safety Logic Circuit that can converge to an active short-circuit state even in case of MCU failure was proposed. And the active short-circuit current and braking torque generated during active short-circuit were analyzed through FEM analysis in consideration of the worst case operating conditions and environmental conditions of IPMSM. Finally, considering the back EMF with respect to the battery cutoff voltage and temperature, the time of switching from 3PS to 6SO was also considered. This paper includes the analysis of the ASC-current in transient and steady state by simulation results.
Y 결선된 7상 BLDC 전동기의 구형파 전류 제어를 위한 새로운 전류 제어방식에 관한 연구
문종주(Jong-Joo Moon),이원(Won Lee),김장목(Jang-Mok Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.4
The current control methods of Y-connected 7 Phase BLDC motor are sine wave current control and square wave control. The sine wave current control method needs dq axis transformation of 7x7 matrix for current control and very complex. Also this method is not suitable for multi Phase BLDC motor of trapezoidal back emf wave. Therefore, in Y connected multi phase BLDC motor, the square wave current control methods are required. Generally, in the 3Phase BLDC system, Average current control method is used for current control. The average current is obtained that the summation of absolute value of each phase current magnitude is divided by the number of conduction phase. However, if average current control method is applied to multi-phase system, there is a problem that each phase currents are different. This problem affects unbalance of each phase torque and fluctuation of total torque. This paper proposed each phase current control method of Y connected 7Phase BLDC system. Proposed method is used for PI controller of each phase for each phase current control. This method can perfect square wave current control. Also, configuration of the method is easier than DQ axis transformation. Proposed method is verified through simulation and experiments.
모바일폰에서의 물리층 코드 최적화에 의한 IrOBEX성능 향상
문종주(Jong-Joo Moon),이승일(Seung-Il Lee),공경호(Kyung-Ho Kong),김석기(Suki Kim) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
모바일 폰에서 IrDA를 통하여 개인정보(전화번호부, 동영상, 사진등) 송수신시 IrMC, IrOBEX 그리고 HDLC 프로토콜 기반위의 IrLAP등의 프로토콜 스택을 사용하고 있다. Primary, secondary 두 mobile phone 간에 IrLAP layer의 payload data 송수신시 이용되는 3가지 physical layer schemes 중 전송속도 115.2kbps data rate의 제안된 표준인 Asynchronous(Async) frame 방식을 이용한다. 현재의 모바일 폰에서는 Async frame scheme을 구현하기 위한 인터페이스 방식 중 UART 인터페이스를 이용하여 구현하고 있다. 현 모바일 폰에 이미 구현 되어 있는 기존 UART의 FIFO 제어 방법과 Interrupt service routine의 제어 알고리즘을 개선하여 기존 제어 방식과 비교하고 향상된 성능의 결과는 Throughput로 도출한다. 현 모바일 폰에서 사용자가 개인 정보 data등을 저장할 수 메모리 공간이 점점 늘어나고 있는 추세이다. Camera의 해상도 현 5Mega pixel까지 지원되고 동영상 파일 등도 근거리 무선통신인 IrDA로 송수신할 수 있으므로 본 성능비교 file의 size는 100Mega 이상도 비교할 수 있도록 하였다.
천식 환자에서 집먼지진드기 감작 유무에 따른 임상적 차이: 순천향 코호트 분석
김정현 ( Jung Hyun Kim ),장안수 ( An Soo Jang ),정신옥 ( Shin Ok Jeong ),지영석 ( Young Seok Ji ),서현정 ( Hyun Jung Seo ),남재형 ( Jae Hyung Nam ),문종주 ( Jong Joo Moon ),백애린 ( Ae Rin Baek ),박종숙 ( Jong Sook Park ),이준혁 ( 대한소아알레르기호흡기학회 2013 Allergy Asthma & Respiratory Disease Vol.1 No.1
Purpose: The majority of patients with allergic disease are highly sensitized to house dust mites (HDM). There is few data to observe sensitization rate to HDM in asthmatics in Korea. The aim of this study was to observe the differences of clinical profiles by HDM sensitization in patients with asthmatics in Soonchunhyang University Hospital (SCH) cohort. Methods: We recruited 2,345 asthmatic patients in SCH cohort. Lung function, body mass index and sputum and blood eosinophils, and PC20, and clinical profiles were compared by HDM sensitization. Results: Dermatophagoides farinae (Derf) and/or Dermatophagoides pteronyssinus (Derp) (+) sensitization rate was higher prevalence in male than in female. Compared with nonatopy asthmatics, Derf and/or Derp (+) asthmatics had early onset of age [Derf and/or Derp (+) vs. Derf and Derp (-) vs. atopy (-); 32.5±0.51 vs. 36.1±0.88 vs. 43.1±0.54, P<0.05]. Derf and/or Derp (+) asthmatics had shorter duration of asthma symptom than that of nonatopy asthmatics. Derf and/or Derp (+) asthmatics had lower forced expiratory volume in one second and forced vital capacity than those of Derf and Derp (-) asthmatics. PC20 in Derf and/or Derp (+) asthmatics had lower than those of Derf and Derp (-) and nonatopy asthmatics [Derf and/or Derp (+) vs. Derf and Derp (-) vs. atopy (-); 5.4±0.24 mg/ mL vs. 6.59±0.52 mg/mL vs. 7.19±0.33 mg/mL, P<0.05]. Blood eosinophils number in Derf and/or Derp (+) asthmatics had higher than that of nonatopy asthmatics (414.7±131.1 vs. 350.6±14.0, P<0.05). Total immunoglobulin E (IgE) in Derf and/or Derp positive asthmatics had higher than that of Derf and Derp negative and nonatopy asthmatics. There was no difference of body mass index among three groups. Conclusions: Our data indicate that atopy asthmatics sensitized to Derf and/or Derp had early onset of age, high total IgE and airway responsiveness, and eosinophilic inflammation. (Allergy Asthma Respir Dis 1(1):50-54, 2013)