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Camphene/WO<sub>3</sub>-NiO 슬러리의 동결건조 및 수소분위기 열처리에 의한 W-Ni 다공체 제조
박성현,박성민,박소정,박보영,오승탁,Park, Sung Hyun,Park, Seong-Min,Park, So-Jeong,Park, Bo-Yeong,Oh, Sung-Tag 한국재료학회 2018 한국재료학회지 Vol.28 No.2
The present study demonstrates the effect of raw powder on the pore structure of porous W-Ni prepared by freeze drying of camphene-based slurries and sintering process. The reduction behavior of $WO_3$ and $WO_3-NiO$ powders is analyzed by a temperature programmed reduction method in Ar-10% H2 atmosphere. After heat treatment in hydrogen atmosphere, $WO_3-NiO$ powder mixture is completely converted to metallic W without any reaction phases. Camphene slurries with oxide powders are frozen at $-30^{\circ}C$, and pores in the frozen specimens are generated by sublimation of the camphene during drying in air. The green bodies are hydrogen-reduced at $800^{\circ}C$ and sintered at $1000^{\circ}C$ for 1 h. The sintered samples show large and aligned parallel pores to the camphene growth direction, and small pores in the internal wall of large pores. The strut between large pores, prepared from pure $WO_3$ powder, consists of very fine particles with partially necking between the particles. In contrast, the strut densification is clearly observed in the Ni-added W sample due to the enhanced mass transport in activation sintering.
박성현,정중식,박영수,Park Seong-Hyun,Jeong Jung-Sik,Park Young-Soo 해양환경안전학회 2006 해양환경안전학회지 Vol.12 No.2
여수해만 특정해역 밖의 인근해역은 섬들이 매우 많고 수심이 낮은 해역으로서 한반도의 동 서해안을 운항하는 선박들이 섬 사이의 협소한 해역을 통항하고 있어 잦은 교행이 이루어지고 있다. 또한 이들 선박은 소리도 남단과 욕지도 부근 해역에서 원유 운반선, 광석운반선 및 컨테이너선과 같은 대형선과 만나면서 교통 혼잡도를 가중시키고 있다. 따라서 본 연구에서는 교통의 흐름을 단순화하고, 교차 및 집중 상황을 완화시키기 위한 통항분리대 도입 및 추천항로를 제안한다. In adjacent sea areas of Yeosu, there are many crossing traffics between eastbound and westbound vessels. Traffic congestion is increasing in sea area of east Sori island and near Yokji Island. In this research, we established TSS near Yeokmando Areas and new recommended route which connected to Seopdo west recommended route to reduce meeting traffic between eastbound vessels and westbound vessels.
박성현 ( Sung Hyun Park ),이광혁 ( Kwang Hyuck Lee ),강기주 ( Ki Joo Kang ),신도현 ( Do Hyun Shin ),정현욱 ( Hyun Wook Jung ),최성호 ( Seong Ho Choi ),장기택 ( Kee Taek Jang ) 대한소화기학회 2009 대한소화기학회지 Vol.53 No.3
Primary hepatic carcinosarcoma which has comprised of a mixture of both carcinomatous and sarcomatous elements is very rare. This tumor has been variously called as carcinosarcoma, pleomorphic large cell carcinoma, giant cell carcinoma, or undifferentiated carcinoma. Only less than 20 cases of carcinosarcoma of the liver have been reported sporadically up to now worldwide. Herein, we present a case of carcinosarcoma of the liver along with a review of the literatures. (Korean J Gastroenterol 2009;53:198-201)
박성현 ( Seong Hyun Park ),이승용 ( Seung Yong Lee ),홍진석 ( Jin Seok Hong ),최혜자 ( Hye Ja Choi ),윤석권 ( Seok Kweon Yun ),김한욱 ( Han Uk Kim ),임철완 ( Chull Wan Ihm ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.5
Tufted angioma is a relatively rare hemangioma which mainly occurs in pediatric age. It is slowly-growing over years, with a clinical picture of papule to plaque. Development with an annular configuration is very rare and only five such cases have been reported worldwide. A 64-year-old woman presented with an egg-sized, red, annular lesion on her abdomen which had started as a papule 8 years previously. The biopsy revealed typical histopathological features of tufted angioma. The lesion was treated three times with surgery or cryotherapy and showed recurrence each time over the seven years. During the course it was apparent that the lesion was showing annular extension. We believe the case is the first report of annular tufted angioma showing central regression in Korea. It was also interesting that the benign lesion showed recurrence twice after complete subsidence. (Korean J Dermatol 2007;45(5):448~452)
박성현(Park Seong-Hyun),서장후(Seo Jang-Hoo) 한국태양에너지학회 2013 한국태양에너지학회 학술대회논문집 Vol.2013 No.11
The rapid growth of data center industry has led to the vast increase in power consumption of server equipments in the data center which is operated for 365 days. Cooling power consumption for removal of heat load of server apparatuses has increased also. In this study, energy consumption is analyzed by TRNSYS simulation for domestic data center. We have also conducted the economic evaluation using Life Cycle Cost(LCC) method based on air-side economizer system adoptability. As a result, when applied a air-side economizer system, break-even point is made at most 1 years compared to central chilled water cooling system.