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Effects of a Shroud Tube on Flow Field and Particle Behavior Inside a Bag-Filter Vessel
Park, Seok Joo,Choi, Ho Kyung,Park, Young Ok,Son, Jae Ek Taylor Francis 2003 AEROSOL SCIENCE AND TECHNOLOGY Vol.37 No.9
<P>A shroud tube was used to decrease the amount of particles toward the bag filters from whole particles entering a filter vessel. The effects of the shroud tube on the flow field and particle behavior inside the vessel were studied. The air mixed with dust particles enters the vessel through a tangential inlet duct. Some of the particles are deposited on the inside wall of the vessel and the surface of the shroud tube. The other ones are collected on the filter surface or passed through it. The particles deposited on the wall surfaces fall into a hopper by gravity, and those collected on filters are removed by back pulse-jet flow. Computational simulation was performed to know the prereduction rate of particles by deposition on the wall surfaces for the different shroud tubes. The experiment was accomplished with some shroud tubes suggested by the results of computational simulation, and the experimental results were compared qualitatively with the computational results. The shroud tube blocked the direct transport of particles toward the bag filters and reduced the particle loading onto the filters. The particle loading was reduced when the upper region of the vessel was not blocked by the shroud tube more than when the vessel was blocked wholly with the filters from the upper end wall. However, the re-entrainment of the particles removed from the filters by the back pulse cleaning increased when the upper region of the vessel was not blocked by the shroud tube more than when the vessel was blocked wholly with the filters from the upper end wall.</P>
미국에서의 이민자선교와 북미지역교회 “브리지 커뮤니티 교회”의 선교전략
박익휘 ( Park Ek Ikheuy ) 한국복음주의선교신학회 2022 복음과 선교 Vol.59 No.-
The purpose of this paper is to explore how the local church reaches out to immigrants. This mission strategy paper explores how the Bible builds the case for reaching immigrants. In this first section, I will suggest Jesus’s cross-cultural strategy to the Samaritan village and provide a biblical model of immigration according to the book of Ruth. Second, to understand why many churches neglect local immigrant populations, this paper will provide a historical understanding of the development of cross-cultural missions and explore how those understandings were applied. Third, this paper will examine an ethnographic study in Lansdale, Pennsylvania, at the Bridge Community Church [BCC] to reveal how the church addresses the immigrant population. Finally, this paper will suggest three main strategies under these approaches (biblical, historical, ethnographic) that BCC may apply.
김은경(EK Kim),유상영(SY Ryu),김수연(SY Kim),김재원(JW Kim),박노현(NH Park),박인애(IA Park),송용상(YS Song),강순범(SB Kang),이효표(HP Lee) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.6
Squamous cell carcinoma of the ovary is very rare malignant tumor usually originating from the malignant transformation of mature cystic teratoma. Because of its rarity, the clinico-pathologic characteristics are not well established. We have experienced three cases of squamous cell carcinoma of the ovary arising in mature cystic teratoma. We investigated the clinical profiles and histopathologic features of these patients, and examined the presence of p53 mutations with immunohistochemical method. First, a 54-year-old woman with FIGO stage Ia survived for 124 months without adjunctive chemotherapy after total hysterectomy and bilateral salpingo-oophorectomy. Second, a 75-year-old woman with FIGO stage IIIc who had rejected adjunctive chemotherapy after total hysterectomy and bilateral salpingo-oophorectomy expired 3 months later. Third, a 39-year-old premenopausal woman with FIGO stage IIIb recurred after 7 months in spite of surgery and adjunctive chemotherapy. We report these three cases of squamous cell carcinoma arising in mature cystic teratoma of the ovary with brief review of literature.
원발성 난관암의 임상병리학적 특징 및 p53 유전자 변이 양상
박노현(NH Park),김은경(EK Kim),서원석(WS Seo),김용범(YB Kim),이철민(CM Lee),김재원(JW Kim),박인애(IA Park),송용상(YS Song),강순범(SB Kang),이효표(HP Lee) 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.9
Because of the rarity of primary carcinoma of the fallopian tube (PCFT), the clinicopathologic characteristics have not been well known. The aim of this study was to identify the clinicopathologic characteristics and p53 mutant gene expression in PCFT. We reviewed retrospectively the clinical records of PCFT treated at Seoul National University Hospital between 1987 and 1996, and identified 6 patients with PCFT. The clinicopathological profile was analyzed and immunohistochemical staining for p53 were done to identify p53 mutant gene overexpression. The mean age was 57.5 years and all 6 cases were multiparous. The most common symptom was lower abdominal pain. The patients were staged as follows according to FIGO (1992): stage Ⅰa, 1; stage Ⅱa, 2; stage Ⅲb, 1; stage Ⅲc, 1; stage Ⅳ, 1. During 50 (9-118) months of follow-up, three patients are alive without recurrence for average 26 months. The p53 staining was positive in 4 cases (67%), and three of them were dead (N=2) or recurred (N=1). In conclusion, primary cancer of fallopian tube was difficult to diagnose prior to surgery. The prognosis was generally poor and the p53 abnormality might be associated with worse prognosis.
박용원(YW Park),정인배(IB Chung),김재욱(JU Kim),양영호(YH Yang),한은경(EK Han),박찬일(CI Park) 대한산부인과학회 1989 Obstetrics & Gynecology Science Vol.32 No.10
최근저자들은 제태기간 36주에 초음파진단에 의해 선천성 골형성부전증을 경험하였기에 문 헌적 고찰과 함께 보고하는 바이며, 이를 경험으로 많은 저자들이 보고한 바와 같이 임신 14주이후부터 숙련된 초음파 술자에 의한 의례적인 시행이 산전관리의 필수적 검사임을 강 조하지 않을 수 없다. osteogenesis imperfecta is a clinical , genetically biochemically radiologically heterogenous group of inherited connective tissue disorder characterized by bone fragility and other evidence of connective tissue involvement. One of these , the perinatal form on OI tyep II is rare disorder characterized by poorly ossified calvaria, beaded rib and short, bowed limbs. we recentrly exeprinced a case of OI type II diagnosed in utero by ultrasonography and confirmed by postnatal radiograph and autopsy. We present the case with the review of the literatures
분체공학 , 유동층 , 고분자 , 재료 ( 무기 , 유기 ) : 소결금속섬유필터의 기초 성능 특성
김상도(Sang Do Kim),박영옥(Young Ok Park),서정민(Jeong Min Seo),박석주(Seok Ju Park),최호경(Ho Kyoung Choi),박현설(Hyun Sul Park),임정환(Jeong Hwan Lim),손재익(Jae Ek Son) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.4
Basic filtration characteristics including pressure drop, penetration and fractional collection efficiency were investigated for sintered metal fiber filters. Two filters were applied. It was found that the porosity, weight and thickness were same, the air permeability and filtering accuracy were different. The performance test of fabric filter was investigated using a flat sheet filter testing unit, which can be applied to the filter of 300×300 ㎜ size. The test dust was AC Fine Dust. The pressure drop increased with filtration velocity and dust loading. The initial stage of dust cake formation was a growing process of particle dendrites on a single filament in the pore and the second stage was a bridge formation process with increasing dust loading. The final stage was a process of constant deposition of dust on a fabric surface under heavy dust loading conditions. The penetration sharply increased with filtration velocity in the intial stage of dust loading. It sharply decreased with dust loading, but the rate of decrease gradually diminished under heavy dust loading conditions. The pressure drop and penetration have been correlated in terms of operating variables such as dust loading and filtration velocity. The pressure drop and penetration calculated from the correlation equation have been compared with the experimental data and the agreement between the two data was fairly good. The fractional collection efficiency increased with dust loading.
High-resolution three-photon biomedical imaging using doped ZnS nanocrystals
Yu, Jung Ho,Kwon, Seung-Hae,Petrá,š,ek, Zdeně,k,Park, Ok Kyu,Jun, Samuel Woojoo,Shin, Kwangsoo,Choi, Moonkee,Park, Yong Il,Park, Kyeongsoon,Na, Hyon Bin,Lee, Nohyun,Lee, Dong Won,Kim, Nature Publishing Group 2013 NATURE MATERIALS Vol.12 No.4
Three-photon excitation is a process that occurs when three photons are simultaneously absorbed within a luminophore for photo-excitation through virtual states. Although the imaging application of this process was proposed decades ago, three-photon biomedical imaging has not been realized yet owing to its intrinsic low quantum efficiency. We herein report on high-resolution in vitro and in vivo imaging by combining three-photon excitation of ZnS nanocrystals and visible emission from Mn<SUP>2+</SUP> dopants. The large three-photon cross-section of the nanocrystals enabled targeted cellular imaging under high spatial resolution, approaching the theoretical limit of three-photon excitation. Owing to the enhanced Stokes shift achieved through nanocrystal doping, the three-photon process was successfully applied to high-resolution in vivo tumour-targeted imaging. Furthermore, the biocompatibility of ZnS nanocrystals offers great potential for clinical applications of three-photon imaging.