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Review of Emergency Procedures for CANDU Reactors
김성래,권종수,조주현,박성훈,남상구,Kim, S.R.,Kwon, J.S.,Cho, J.H.,Park, S.H.,Nam, S.K. Korean Nuclear Society 1995 Nuclear Engineering and Technology Vol.27 No.4
The generation, verification and validation of Emergency Procedures for Nuclear Power Plant is a difficult and complex process. Atomic Energy Control Board(AECB) requires that emergency procedure and plan be produced before obtaining the Operating License, that is, detailed plans and procedures to handle emergency situations for both on-site actions and off-site actions be developed. In this report Emergency Operating Procedures Standard for Canadian Nuclear Utilities which makes reference to U. S. practices and the current direction of emergency procedures for CAN-DU reactors are reviewed and compared based on scope(events covered), methodology (event-oriented or symptom-oriented or hybrid) and format(method of presentation) preponderantly, and an attempt is made to integrate these procedures and as a result the recommended strategy for Wolsong unit 2, 3, & 4 is presented as event-specific procedures, generic procedures(when event is not diagnosed) and whose format is combination of logic diagram and text.
PVA 성분비에 의한 PVA-Hydrogel의 점탄성 성질에 대한 연구
한창완(C. Han),김한종(H. Kim),이영석(Y. Lee),박성훈(S. Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
Polyvinyl Alcohol-Hydrogel (PVA-H) is a biomaterial used for manufacturing contact lenses as well as for the medium of drug delivery. Previous studies have also showed that PVA-H exhibits superior biocompatibility with hydrophilic elastic nature. The aim of this study is to examine the possible usage of the PVA-H as cartilage replacement material by determining the static and dynamic mechanical properties of PVA-H with different ratios of polyvinyl alcohol (PVA) and phosphate buffered saline (PBS) compositions. Three different types of PVA-H specimens were made by changing the ratio of PVA (Sigma-Aldrich) and PBS (Sigma-Aldrich) compositions (PVA-H1: 10wt% PVA and 90 wt% PBS; PVA-H2: 20wt% PVA and 80 wt% PBS; PVA-H3: 25 wt% PVA, 45 wt% PBS and DMSO 30 wt%). Static and dynamic tensile tests under the loading frequencies of 0.001, 0.01, 0.1, and 1 Hz were carried out to measure the biomechanical properties of PVA-H1, -H2 within PBS solution and -H3 within PBS/ DMSO solution. The equilibrium Youngs moduli (EY) of PVA-H1, -H2 and -H3 evaluated from the static displacement control were 84.2±35.1 kPa (n=10), 254±32.2 kPa (n=10) and 588±38.9 kPa (n=5), respectively. The amplitudes of dynamic tensile moduli were varied from 86.3±33.4 kPa (n=10) at 0.001 Hz to 96.9±42.0 kPa (n=10) at 1 Hz for PVA-H1, 282.7±26.4 kPa (n=10) at 0.001 Hz to 309.1±32.2 kPa (n=10) at 1 Hz for PVA-H2 and from 643.8±49.8 kPa (n=10) at 0.001 Hz to 747.7±67.7 kPa (n=5) at 1 Hz for PVA-H3. According to the current results, the frequency dependence of the magnitude of the dynamic modulus confirms the viscoelastic nature of PVA-H material. However, it can be noted that the dynamic modulus increases by up to a factor of 1.15 for PVA-H1, 1.22 for PVA-H2 and 1.27 for PVA-H3, showing insignificant viscoelasticity compared with that for cartilage. The result that static and dynamic moduli of PVA-H3 are larger than those of PVA-H1 and PVA-H2 also suggests that the amount of PVA composition in PVA-H plays an important role in improving both static and dynamic mechanical strengths of PVA-H plays an important role in improving both static and dynamic mechanical strengths of PVA-H material. The phase angle decreased from 5.2±2.1 ˚ at 0.001 Hz to -0.3±1.7 ˚ at 1 Hz for PVA-H1, from 5.6±0.6 ˚ at 0.001 Hz to -0.3±0.7 ˚ at 1 Hz for PVA-H2 and from 8.2±1.1 ˚ at 0.001 Hz to 0.7±0.7 ˚ at 1 Hz for PVA-H3.
에어컨 시스템 내 냉매 분배기의 2상 냉매 분배 특성에 대한 수치해석적 연구
박성훈(S.H. Park),허남건(N. Hur),서범수(B.S. Seo) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
To improve the efficiency of heat transfer in cooling and heating systems, an efficient distribution of refrigerant is required. Especially, the performance of heat exchanger with the two-phase refrigerant is closely related with the splitting characteristics of refrigerant. In the present study, the splitting characteristic of two-phase refrigerant inside a distributor was numerically predicted by using an Eulerian method. For the prediction of pressure drop in several downstream tubes, the pressure boundary conditions based on the Lockhart and Martinelli method was applied to the outlet boundary of numerical model. With these numerical methodologies, splitting characteristic of two-phase refrigerant was predicted for various conditions. In this way, numerical results were in good agreement with experimental data. From the results, it was observed that the splitting characteristics of two-phase refrigerant are determined by the geometric factors of distributor. With the numerical results of splitting characteristics in the distributor with various geometric parameters, the optimized geometry of distributor was obtained for the uniform split of refrigerant.
전처리-전착 공정 중 후드 변형 예측을 위한 자동차 주변 유체 유동 특성의 수치해석적 연구
박성훈(S.H. Park),허남건(N.K. Hur),오창석(C.S. Oh) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
There are different kinds of methods in coloring process of vehicles. The electro-deposition process has excellent coating performance, it causes deformation of a vehicles hood in the processing. The predict the deformation of vehicle’s hood in electro-deposition process, analysis is required about the painting system. The reason the hood of vehicle is deformed in the electro-deposition process is fluid pressure such as paint. Therefore, CFD simulation was used for analyzing the distribution pressure imposed on vehicles in the painting process. In the present study, electro-deposition pool and vehicle’s movement were considered in order to predict the characteristics of pressure distribution of the vehicles hood, ASI method and VOF method were used for the movement of the vehicle and interface tracking. The numerical results derived, from the numerical method had a good agreement with the experimental data. The results of present study can be provided as useful information for prevention of deformation in the electro-deposition painting process.
박성훈(S.H. Park),김정수(J.S. Kim),허신(S. Hur),경진호(J.H. Kyung),송달호(D.H. Song) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Dynamic characteristics of pantograph-catenary system that supplies electrical power to high-speed trains are investigated. A simple catenary is composed of the contact and messenger wires connected by hamgers possessing bi-directional stiffness properties. The influences of parameters that determine the contact properties of pantograph - catenary system are investigated through numerical simulations. For the catenary, a finite difference model composed of 10 spans is constructed. The contact and messenger wires are modeled as strings with respective tension and damping ratio values. The pantograph is modeled as a linear 3-degree-of-freedom system. It is found that the tension, number of hangers and damping ratios as well as the speed of the train significantly influence the contact forces and contact separation rate.
박성훈(S . H . Park),김용태(Y . T . Kim),정혁(H . Jung) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.12
A case of uterine rupture on 22 weeks' gestation of pregnancy by sexual intercourse in a 31-year-old woman was presented and reviewed briefly.