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가동원전에서 공정모델링을 통한 PID 튜닝 시뮬레이션 방법
민문기(Moon-Gi Min),정창규(Chang-Gyu Jung),이광현(Kwang-Hyun Lee),이재기(Jae-Ki Lee),김희제(Hee-Je Kim) 대한전기학회 2014 전기학회논문지 P Vol.63 No.4
PID(Proportional, Integral, Derivative) controller is the most popular process controllers in nuclear power plants. The optimized parameter setting of the process controller contributes to the stable operation and the efficiency of the operating nuclear power plants. PID parameter setting is tuned when new process control systems are installed or current process control systems are changed. When the nuclear plant is shut down, a lot of PID tuning methods such as the Trial and Error method, Ultimate Oscillation method operation, Ziegler-Nichols method, frequency method are used to tune the PID values. But inadequate PID parameter setting can be the cause of the unstable process of the operating nuclear power plant. Therefore the results of PID parameter setting should be simulated, optimized and finally verified. This paper introduces the simulation method of PID tuning to optimize the PID parameter setting and confirms them of the actual PID controller in the operating nuclear power plants. The simulation method provides the accurate process modeling and optimized PID parameter setting of the multi-loop control process in particular.
변압기 지역 코로나 전자파 간섭에 의한 계측제어설비 영향에 관한 연구
민문기(Moon-Gi Min),이재기(Jae-Ki Lee),박진엽(Jin-Yeub Park),김희제(Hee-Je Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.2
The Electromagnetic Interference(EMI) generating from corona discharge of transformer area can interference the digital Instrument and Control(I&C) systems located nearby transformers. When the potential gradient of the electric field around the conductor is high enough to form a conductive region but not high enough to cause electrical breakdown to nearby objects, the EMI of corona discharge emits with the conducted and radiated noise and it interferences the signals of the I&C systems. Since digital I&C systems have an efficiency and competitive price, the analog I&C systems have been upgraded and displaced with the digital I&C systems but which have less EMI Immunity. There was no assessment to I&C systems by EMI generating corona discharge nearby transformers. When the safety-related I&C systems are installed in plants, the verification of equipment EMI should be done not in site-specific test but in test facilities. There are the need to do the site-specific EMI evaluation of corona discharge nearby transformers. This paper assesses the margin between plant emission limits and the highest composite plant emission of corona. When the non safety-related I&C systems are placed in transformer area, it suggests the appropriate radiated susceptibility level to EMI of corona discharge.
원자력발전소 PID 공정제어기에 대한 튜닝 최적화 방법
성찬호,민문기,Sung, Chan Ho,Min, Moon Gi 한국압력기기공학회 2014 한국압력기기공학회 논문집 Vol.10 No.1
PID(Proportional, Integral, Derivative) controller is one of the most used process controllers in nuclear power plants. The optimized parameter setting of process controller contributes to the stable operation and efficiency in the operating nuclear power plants. PID parameter setting is tuned when new process control system is established or process control system is changed. It is a burdensome work for I&C(Instrument and Control) engineers to tune the PID controller because it requires a lot of experience and knowledge. When the plant is in operation, inadequate PID parameter setting can be the cause of the unstable process of the plant. Therefore the results of PID parameter setting should be compared, simulated, verified and finally optimized. The practical PID tuning methods used in process controller are tuning operation calculation(Ziegler-Nicholes, Minimum TIAE, Lambda, IMC), exclusive tuning program based on computer and Matlab application. This paper introduces the various tuning methods and suggests an optimized PID tuning process in the operating nuclear power plants.
민진홍,이장영,민문기,정성필,김승환,유인술,Min Jin Hong,Lee Jang Young,Min Moon Gi,Chung Sung Pil,Kim Seung Whan,Yoo In Sool 대한임상독성학회 2004 대한임상독성학회지 Vol.2 No.2
Ethylene glycol poisoning can cause profound morbidity and is almost universally fatal if untreated. Central nervous system depression, pulmonary edema, and acute oligulic renal failure with crystalluria are among the most commonly encountered complication of ingestion. Ingestion of ethylene glycol may be an important contributor in patients with metabolic acidosis and subsequent renal failure. The diagnosis of ethylene glycol poisoning is based on nonspecific clinical symptoms and signs and indirect and direct laboratory measurement of ethylene glycol. As a result, diagnosis and treatment sometimes can be delayed. We describe 52-year-old man who visited to emergency department with mental change of unknown origin. The patient has high anion gap metabolic acidosis and renal failure due to ingestion of antifreeze that contained ethylene glycol. We used hemodialysis for elimination technique. The patient was discharged with minimal complication.
중증외상환자에서 알코올 섭취에 따른 중증도와 예후에 대한 연구
정호형 ( Ho Hyung Jung ),한상균 ( Sang Kyoon Han ),이성화 ( Sung Wha Lee ),박성욱 ( Sung Wook Park ),박순창 ( Soon Chang Park ),염석란 ( Seok Ran Yeom ),민문기 ( Moon Gi Min ),김용인 ( Yong In Kim ),류지호 ( Ji Ho Ryu ) 대한외상학회 2014 大韓外傷學會誌 Vol.27 No.4
Purpose: Alcohol ingestion is a significant risk factor for injuries. However, the influence of high blood alcohol concentration about the severe traumatic injury is controversial. The aim of study was to analyze the injury severity, prognosis in severe traumatic patients according to alcohol ingestion. Methods: This study was performed retrospectively with severe traumatic patients (Injury Severity Score≥16) who visited the emergency department at Pusan National University Hospital from January 2013 to December 2013. Results: In total 98 severe traumatic patients, blood alcohol concentration (BAC) positive group (BAC>30 mg/dl) is 42 (42.90%) patients and BAC negative group (BAC≤30 mg/dl) is 56 (57.10% )patients. Head and neck injury is significantly high in BAC positive group (35 patients, 83.3%) compared to BAC negative group (33 patients, 58.9%). Comparison of injury severity, outcome and mortality is not significantly different between two groups. Conclusion: In severe traumatic patients, head and neck injury occurred high in BAC positive group. Alcohol ingestion did not influence injury severity, outcome in severe traumatic patients. However, effort to decreasing injury related to alcohol ingestion and prospective multi-center study is needed. [ J Trauma Inj 2014; 27: 108-14 ]