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- 저자 : 김원민(Kim Won Min) (검색결과 5 건)
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송은실(Song Eun Sil),김원민(Kim Won Min),이광남(Lee Kwang Nam) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Pressure locking occurs when the fluid in the valve bonnet is at a higher pressure than the adjacent piping at the time<br/> of valve opening by pressure trapping and bonnet heatup. Pressure locking is a phenomena which can cause the<br/> unseating thrust for a gate valve to increase from its typically static unseating thrust. This can result in the valve<br/> actuator having insufficient capability to open the valve. In addition, this can result in valve damage in cases where the<br/> actuator capability exceeds the valve structural limits. This paper discusses the primary mechanisms which cause<br/> pressure locking. These include sudden depressurization of piping adjacent to the valve and depressurization of fluid<br/> trapped in the valve bonnet due to heat transfer. This paper provides a methodology to calculate the unseating thrust for<br/> a valve which is pressure locking and applies to motor operated isolation valves of Residual Heat Removal<br/> System(RHRS).
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발전소 주급수 계통 감발 과정에서의 스윙체크밸브 닫힘 시점의 실험적 결정
서진성(Suh, Jin-Sung),김원민(Kim, Won-Min) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.8
The reliable operation of a swing check valve in the main feed water system of a power plant is most essential for successful shout-down process. A failure to close the valve at proper time often leads to the instability of the main feed water system, or even to an emergency stop of the power plant. In reality it is a very difficult task to monitor the behavior of a swing check valve. Furthermore it is impossible to see the motion of the valve. In this work two measurements were carried out simultaneously to determine the precise valve closure time. The dynamic pressure measurements were made at the inlet and outlet regions of the swing check valve. The transient vibration of the valve housing in the direction of water flow was also measured, which enabled the measurement of the transient vibration of the valve housing near valve closure. By comparing the results produced from these measurements the precise valve closure time could be determined. By carrying out order tracking technique using the dynamic pressure signals and pump rpm signal, the complicated dynamic problems inside the main feed water system can be more easily dealt with. This measurement scheme might be implemented in a power plant on a real-time basis without much difficulty. If this could be implemented, valuable information essential for shut-down operations can readily be passed on to the main control room. The feasibility of this implementation was demonstrated by this experimental work.
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저알부민혈증에서 관찰한 혈청 전해질, 동맥혈가스 분석과 Anion Gap의 변화
신양수 ( Sin Yang Su ),임현성 ( Im Hyeon Seong ),김원민 ( Kim Won Min ),김완중 ( Kim Wan Jung ),장경식 ( Jang Gyeong Sig ),문철웅 ( Mun Cheol Ung ),김호중 ( Kim Ho Jung ) 대한내과학회 1992 대한내과학회지 Vol.42 No.5
Background : The clinical conditions of hypoal-buminemia known as decreased effective arterial blood volume despite increased total blood volume would be well associated with changes of serum electrolytes and acid-base imbalances at initial presentation and/or on the course of tratments for this hypoalbuminemia. The purpose of this study is to determine the influence of hypoabluminemia related to the diverse underlying causes on concentrations of serum sodium and potassium, arterial blood gas findings and the degree of reduced anion gap as well as cause of it. Methods : Thirty one patients admitted to medical wards with hypoalbuminemia (serum albumin13.1 gm/dL) subdivided to three groups (group 1, nephrotic syndrome; group 2, liver cirrhosis; group 3, other chronic diseases) by underlying diseases, but without hypotension or overt organic acidosis, and seventeen healthy control subjects designated as group 4 (serum albumin>4.0 gm/dL) were included in this prospective study. Simultaneous measurements of serum electrolytes, calculation of anion gap as Na^(+)-(Cl^(-)+HCO^(-)₃), and arterial blood gas analysis were performed. Results : Hyponatremia, hypokalemia and decreased anion gap with more alkalemic pH were observed in mean values of each hypoalbuminemic subgroup when compared to control group with statistical significance (p<0.01) except mean value of serum sodium, serum potassium and alkalemia in a subgroup with nephrotic syndrome. Mean albumin level and mean anion gap of total hypoalbuminemic patients (n=31) were significantly lower compared to those of control healthy subjects (n=17)(p<0.001). However, the difference of reduced anion gap (mean value, 4 mEq/L) was smaller than expected to degree of serum albumin reduction (mean value of reduction, 2.6 gm/dL) on view of more than 2.5 mEq/L of negative charges per 1 gm of serum albumin in normal blood pH. In all 48 subjects, a statistically significant correlation was found between serum sodium and individual albumin (r=0.57, p<0.001), and between the anion gap and individual serum albumin (r=0.62, p<0.001) with no correlation between the anion gap and serum sodium as well as the anion gap and arterial pH. Conclusions: Hyponatremia, hypokalemia, alkalemia and decreased anion gap were commonly noted in patients with hypoalbuminemia in addition to statistical significant positive correlation between the anion gap and individual serum albumin, and between serum sodium and individual serum albumin. The decrement of anion gap associated with hypoalbuminemia was out of proportion to the degree of hypoalbuminemia, which would be explained by summation of other factors associated with hypoalbuminemia, such a s alkalemia, hyponatremia, unidentified anions and increased lactate in alkalemia though not measured in this study.
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만성 활동성 간염에 병발한 재발성 Guillain-Barre 증후군
임현성 ( Im Hyeon Seong ),신양수 ( Sin Yang Su ),김원민 ( Kim Won Min ),최성도 ( Choe Seong Do ),정태홍 ( Jeong Tae Hong ),김만우 ( Kim Man U ),조경원 ( Jo Gyeong Won ),정원영 ( Jeong Won Yeong ) 대한내과학회 1993 대한내과학회지 Vol.44 No.2
Guillain-Barre syndrome complicating chronic active hepatitis is rare. In its antecedent and associated illness, various viral infections are commonly involved (esp. viral hepatitis). A classic features that allow diagnosis of GBS is ascending symmetrical weakness, areflexia, minimal sensory loss, and albuminocytological dissociation in CSF. A number of neurological complications of viral hepatitis have been reported, including hepatic coma, hemorrhages into the CNS, both subdural and intraparenchymal. encephalitis, meningitis, myelitis, isolated pyramidal tract and extrapyramidal tract dysfunction, Meniere`s disease, dermatomyositis, seizures, mononeuritis, plexitis, and psychiatric disturbances. But there were no reports about GBS complicating chronic active viral hepatitis in Korea until now. We report a case of GBS complicating chronic active hepatitis in a 41-year-old male.
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