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문종주,김민석,박무용,최수정,김진국,황승덕 순천향대학교 순천향의학연구소 2013 Journal of Soonchunhyang Medical Science Vol.19 No.2
Objective: Peritonitis is one of major complication of peritoneal dialysis. It is the most important reason for removal of peritoneal catheter, death, or converting to hemodialysis. There is a debate that peritonitis decreases residual renal function. Thus, the authors carried out a study to grasp the prognosis of peritonitis which affects residual renal function (RRF) and assessed the risk factors of its clinical course. Methods: Among 245 patients who had been on peritoneal dialysis in Soonchunhyang University Bucheon Hospital from April 2001 to March 2012, the author selected 91 patients who had kept on peritoneal dialysis for more than 3 months and experienced more than one episode of peritonitis. The medical records and laboratory findings were reviewed. Results: During the average period of 36.3±22.8 months of peritoneal dialysis, total of 182 episodes of peritonitis developed in 91 study subjects. Among them, the 15 cases (8.2%) did not improve despite of intraperitoneal antibiotics and peritoneal catheter was subsequently removed. Eight patients were dead because of peritonitis related complications. The lactic dehydrogenase (LDH) level of peritoneal fluid at the third day of treatment had a significant correlation with peritonitis treatment failure (odds ratio [OR], 1.079; P=0.009) and death (OR, 1.071; P=0.049), respectively. The RRF after peritonitis became significantly low (P=0.011) compared to before peritonitis. But the slopes of declining rate of RRF were not different between before and after peritonitis (P=0.932). Conclusion: The LDH level of peritoneal fluid at the third day of treatment was correlated with treatment failure or death. The declining rate of RRF was not affected after peritonitis.
이황화몰리브덴(MoS2) 적용된 광섬유기반 습도 센서 개발
문종주,김현승,홍광식,고영민,권민기,안태정 한국물리학회 2022 새물리 Vol.72 No.7
In this study, a humidity sensor was developed by combining an etched multimode optical fiber with MoS2 nanoparticles. We measured the change in optical properties due to the interaction of MoS2 and H2O molecules. MoS2 was synthesized with Na2MoO4·2H2O and CH3CSNH2 at 200 °C for 24 h. To obtain high sensitivity to humidity, we selected DMF solution as a solvent. Etched optical fiber was downsized to 50 µm, thereby improving the responsivity to humidity. The optical loss of the fiber-optic humidity sensor to human breathing was to 0.5 dB. The response rate was approximately 0.85 s, and the recovery rate was approximately 5.82 s. We confirmed the performance of the sensor for humidity changes from 40 to 80% in a thermo-hygrostat. In addition, we determined that the simultaneous measurement of temperature and humidity is feasible by combining the optical humidity sensor with a fiber Bragg grating. 본 연구는 MoS2 나노 입자와 식각된 다중모드 광섬유를 결합한 광기반 습도센서에 관한 것이다. MoS2와 H2O 간 상호작용으로 인한 광학적 특성 변화를 측정했다. MoS2는 Na2MoO4·2H2O과 CH3CSNH2을 200 °C 에서 24시간 합성하여 얻었다. 코팅 용액은 MoS2와 디메틸포름아미드(DMF)를 혼합한 직후 사용하였을 때 가장 높은 민감도를 보였다. 다중모드 광섬유의 직경을 약 50 µm까지 식각하여 반응성을 항상시켰다. 이 광기반 습도센서의 호흡에 대한 반응도는 최대 0.5 dB이다. 호흡에 대한 반응 속도는 약 0.85 초였고, 회복 속도는 약 5.82 초였다. 개발된 센서의 습도 변화에 대한 성능 확인을 위해 습도 챔버를 이용한 실험을 진행했다. 센서의 신호 변화는 습도 챔버 내 40 - 80%의 습도 변화를 주어 모니터링했다. 또한 광섬유격자 온도센서와 결합하여 온습도 동시 측정이 가능함을 보였다.
Capacitance Estimation Method of DC-Link Capacitors for BLDC Motor Drive Systems
문종주,김장목,박준호,김용휴 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
This paper proposes a capacitance estimation method of the dc-link capacitor for brushless DC motor (BLDCM) drive systems. In order to estimate the dc-link capacitance, the BLDCM is operated in quadrant-II or -IV among four-quadrant operation. Quadrant-II and -IV are called reverse braking and forward braking, respectively. During the braking operation of the BLDCM, the capacitor is charged by the phase current and then the voltage is increased during the braking operation time. The capacitor current and voltage can be obtained by using the phase current sensor of BLDCM and the dc-link voltage sensor. The capacitance and be easily obtained by the voltage equation of the capacitor. The proposed method guarantees the reliable and simple calculation of the dc-link capacitance without additional hardware system except several the sensors already installed for the motor control system. The effectiveness of the proposed method is verified through both the simulation and experimental results.
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.
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.
차량용 인버터의 능동단락회로 및 능동단락전류 거동에 관한 연구
문종주(Jongjoo Moon),문상현(Sanghyeon Moon) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
This paper investigates the behavior of active short circuit (ASC) in order to protect an inverter and a motor when any faults occur on inverter system at high-speed operation region of motor. The implementation of ASC function is to control the inverter output to be a zero vector which state can be named three phases short (3PS) in the fault condition. The zero vector (3PS) can be generated through two approaches. One is from healthy main MCU, and second is from specific logic circuit to force the zero vector under the fault situation regardless of whether the MCU is healthy or unhealthy. This paper only considers the latter case. The ASC function causes unintended brake torque in the motor and the freewheeling current between the inverter and the motor which is called ASC-current. The ASC-current generates huge heat losses on the power module during transient state. Therefore, this paper proposes a strategy to make robust reliability for the inverter system. In addition, this paper includes the analysis of the ASC-current in transient and steady state by mathematics and simulation.
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.