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.

화학공학(化學工學)의 발달(發達)

박원희,Park, Won-Hui 한국과학기술정보연구원 과학기술정보센터 1964 Journal of Information Science Theory and Practice Vol.2 No.3

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.

회색가스재조합을 이용한 회색가스가중합법 개발 및 3차원 복사 열전달에의 적용

박원희,김태국 대한기계학회 2006 大韓機械學會論文集B Vol.30 No.2

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.

구형 연탄의 연소에 관한 모델연구

박원희,이인철,박원훈,이현구 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.4

가정용 구멍탄과 동일한 조성을 갖는 석탄배합물을 대상으로 연소실험을 실시하여 그 연소특성을 규명하는 한편, 연소모델을 제시하고 그 해석 결과를 실험관측과 비교 검토하였다. 연소시료는 구형으로 성형하여 열천칭으로 감량곡선을 측정하였으며 반응온도, 공기의 공급유량 및 시료크기 등 주요인자들이 연소특성에 미치는 영향을 분석하였다. 미반응 석탄표면에서 일산화탄소의 생성, 회분층내에서 일산화탄소의 재연소반응과 각 성분에 대한 확산저항 그리고 입자 외부의 물질전달저항을 고려하여 수축핵 모델을 설정하고 이론적인 해석을 시도하였다. 모델해석의 결과는 실험관측과 어느 정도 일치되는 경향을 나타내었으나 비등온 효과를 고려하여 모델을 더 개선할 필요가 있음을 제시하였다. An experimental study was performed for the combustion of coal mixture having the same composition as the anthracite briquette in domestic use. A mathematical model was also proposed and the results of theoretical analysis were compared to the experimental results. The purpose here is to investigate the combustion characteristics of the anthracite briquette and to develop a relevant mathematical model. Using a spherical sample, we measured the weight change as a function of reaction time by virtue of a spring thermo-balance. Examined and discussed here are the effects of major parameters on the combustion characteristics such as reaction temperature, flow rate of air, and sample size. A shrinking core model was established by taking into account the generation of carbon monoxide on the surface of unreacted core, the oxidation of carbon monoxide in the ash layer and the diffusional resistance through the ash layer as well as the external mass transfer resistance. The result of model analysis reveals that, although the overall trend is in agreement with the experimental observations, it would be necessary to improve the model by considering the non-isothermal aspect of the combustion system.

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.

축소터널 철도차량 화원 설계 및 임계속도 측정연구

박원희,황선우,김창용 한국화재소방학회 2020 한국화재소방학회논문지 Vol.34 No.4

In this study, the authors designed a reduced-scale railway vehicle fire, which was necessary for evaluating the fire safetyof railway tunnels using a reduced model. To overcome the shortcomings of the methods used in conventional reduced-scalerailway tunnel tests, the authors simulated the fire source of a railway vehicle using a methanol fire source for firebuoyancy, and a smoke cartridge for smoke visualization. Therefore, the heat release mass consumption rates of variousmethane trays were measured using a cone calorimeter (ISO 5660). The critical ventilation velocity in the railway tunnelswas obtained using the designed fire source of the railway vehicle, which was evaluated by the measured temperature atthe top of the tunnel as well as laser visualization. 본 연구에서는 축소모형을 이용한 철도터널의 화재안전성 평가 실험시 필요한 축소모형 철도차량의 화재에 대한설계를 수행하였다. 기존의 철도터널 축소모형 실험시 활용된 방법의 단점을 극복하기 위하여 화재부력을 위하여서는 메탄올 화원을 이용하였으며, 연기 가시화를 위하여서는 스모크카트리지를 활용하여 철도차량 화재를 모사하였다. 지하철 철도차량의 열방출률의 모사를 위하여 다양한 메탄올 연료 팬에 대하여 콘칼로리미터(ISO 5660) 및 저울을 이용하여 열방출률을 측정하였다. 설계된 축소모형 철도차량 화원을 이용하여 축소모형 철도터널에서의 임계속도를 측정하였다. 화재 임계속도는 축소모형 터널 상부에서의 온도 및 레이져를 이용한 가시화 측정결과 등을 종합적으로 검토하여 선정하였다.

사정이 불가능하였던 척수손상 환자에서 Physostigmine을 이용한 유도사정으로 채취한 사정액으로 성곡한 정상출산

박원희,김상철,임진호,심흥방 大韓泌尿器科學會 1992 Korean Journal of Urology Vol.32 No.4