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Molybdenum Trisulfide 의 유동배소에 관하여
박원희,정종인 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.1
The fluidized bed roasting of molybdenum trisulfide cake which is a by product at the chemical processing plant of tungsten ore in Sangdong, Korea has been studied. The molybdenum trisulfide cake with an organic bridging liquid was agglomerated into spherical granules in a rotating drum. The agglomerated granules with 35 to 200 mesh in size were roasted in a fluidized bed using preheated air. Under the constant air temperature condition, the effect of granule size and bed height on the degree of desulfurization were investigated, and it was found that the granules with 150 to 200 mesh and the bed with 9.75 ㎝ height, 1½ times of the bed diameter, gave the best results. Near 1000℉ of bed temperature, the bed became defluidized and sintered. However, at lower bed temperature than 1000℉, could the granules be dead roasted. It was concluded that the proposed agglomeration fluidized-roasting method could be applied to molybdenum trisulfide cake in the large scale.
A Case Report of Testicular Sparganosis Misdiagnosed as Testicular Tumor
박원희,신태영,윤상민,박수환,강용진,김도경,한지영,성도환 대한의학회 2014 Journal of Korean medical science Vol.29 No.7
Sparganosis is a parasitic infestation of human by plerocercoid larvae. Sparganum is usuallyreported to be found in the subcutaneous tissues as well as other organs, includingscrotum. However, testicular sparganosis is extremely rare, because of strong capsule oftunica albuginea. An urban-living 54-yr-old Korean man presented with left scrotal painfor 6 yr. Both testes look normal physically. Ultrasonography revealed poorly defined,heterogeneous mass with increased echogenicity in the left testis. This case wasmisdiagnosed as testicular tumor and underwent orchiectomy, but was diagnosed astesticular sparganosis by histopathology. Sparganosis should be included for differentialdiagnosis of testis tumor in countries where sparganosis is prevalent.
안전기준을 만족하는 철도차량 내장재의 화재 열방출율 측정시험
박원희,이덕희,정우성 한국화재소방학회 2009 한국화재소방학회논문지 Vol.23 No.4
A large-scale fire test was conducted for interior materials from a vehicle installed within a fire test room (ISO 9705). The interior materials are satisfying the Korean guideline for the safety of rail vehicles, where the guideline has taken effect since December 2004 in Korea. The output of ignition source (gas burner) was increased in several controlled steps. The objectives of this test are to assess the fire performance in terms of ignition and flame spread on interior lining materials and to provide data on an enclosure fires involving train interior materials that grow to flashover. These data will be used to develop and calibrate models for fire growth on the interiors of the railway vehicle. 철도차량 내장재를 설치한 화재 시험 공간(ISO 9705)에서 대규모 화재시험이 수행되었다. 여기서 사용 된 내장재는 2004년 12월에 공포된 철도차량에 대한 안전기준을 만족하는 내장재이다. 화원으로는 가스버 너를 이용하였으며 가스버너의 출력은 시간에 따라 증가하도록 설정하였다. 본 시험의 목적은 철도차량 내 장재의 화염전파와 발화에 대한 화재 성능 평가이며, 플레시오버로 성장하는 철도차량 내장재를 포함하는 화재에 대한 여러 데이터들의 확보이다. 이 데이터들은 철도차량 내장재의 화재 성장을 예측하는 모델을 검증하고 개발하는데 사용될 것이다.
지하철 역사 승강장 화재발생시 열/연기 거동 분석을 위한 실험 및 수치 연구 (I) -실험적 접근-
박원희,김동현,김태국,장희철 한국화재소방학회 2006 한국화재소방학회논문지 Vol.20 No.3
In this study boundary velocity which is one of the important boundary conditions for numerical simulation for subway station on fire are experimentally obtained. The tests were conducted according to its operating mode of the ventilation systems in the platform: smoke extraction ventilation mode in occurrence of fire and normal ventilation mode for air conditioning. Velocities are measured at various points on the platform. To examine smoke extraction and air supply capacity in the platform level, air velocities were checked on opening vents. Numerical analysis under normal ventilation mode without fire is conducted by using measured boundary conditions, and the numerical results are compared with the measured velocities on the platform. 역사에서 발생된 화재의 영향을 평가하기 위하여 수치해석을 수행하는데 중요한 입력자료 중에 하나인 유속경계조건을 실험적으로 계측하였다. 실험은 지하 승강장의 환기시스템의 운전 모드(일반 냉방조건과 화재발생시 비상조건)에 대하여 수행되었는데, 운전 모드별로 승강장의 여러 위치에서 유속을 측정하였 으며, 승강장의 급배기구의 배연용량 및 급기량을 급배기구에서 직접 측정하였다. 또한 화재영향을 해석 하기 위한 수치해석 프로그램을 이용하여 평상시 운전모드의 실험값을 기반으로 화재가 발생하지 않은 경 우의 유동장 해석을 수행하여 그 결과와 계측 값을 비교하였다.
Estimation of pyrolysis-related properties using repulsive particle swarm optimization
박원희,Kyung-Beom Yoon,Hee-Chul Chang,김태국 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7
The pyrolysis-related properties of the specimen are obtained by optimizing the repulsive particle swarm optimization technique. Eight pyrolysis-related properties were obtained: virgin thermal conductivity, char thermal conductivity, virgin specific heat, char specific heat,char density, heat of pyrolysis, pre-exponential factor, and activation energy. The surface temperature and the mass loss rate obtained using the optimized properties were consistent with the measured values. In assuming that the properties obtained are physically valid,and that the surface temperature and mass loss rate measured in the experiment are correct, a valid fire phenomenon may be considered for replication if fire analysis is conducted using the properties obtained from the procedures proposed in this study.
박원희,김창용,양성진 한국방재학회 2016 한국방재학회논문집 Vol.16 No.4
In this study, fire simulations regarding two scenarios, a standard fire source and a large-scale fire source, were conducted for Line 1 new passenger railway car. The propagation aspect of the fire and smoke and the operational time of the fire detectors for the railway car were estimated. The combustibility of the specimen for each interior material was applied to the simulation. The results of the assessment showed that the fire detector installed inside a railway passenger car sounded the fire alarms within 60 s for both the standard and large-scale fire sources inside the car, in accordance with the design criteria. The potential for false or malfunctioning fire alarms can be minimized when four fire detectors are installed in each railway passenger car, providing a linked detection system. In addition, a fire can be effectively detected during the earliest stages using the linked system, thus contributing to swiftly alarming the passengers and allowing for a quick evacuation. 본 연구에서는 1호선 신규 철도차량에 표준화원과 대화원 두 가지 시나리오 화원에 대하여 화재시뮬레이션을 수행하였으며 이에 따른 화재/연기의 전파 양상과 철도차량용 화재감지기의 작동시간을 예상해보았다. 각 내장재들의 시편단위 연소특성을 시뮬레이션에 적용하였다. 표준화원 및 대화원의 화재가 철도차량 내부에 발행하였을 경우 철도차량 내부에 설치된 화재감지기가 기준인 60초 이내 화재경보를 발하는 것으로 평가되었다. 고려한 차량과 같이 1량에 4개의 감지기가 설치되어 연동감지를 한다면 비화재보(오동작)을 최소화하여 화재초기에 효과적으로 화재를 감지하여 승객들의 신속한 대피경보가 가능한 것으로 판단된다.