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촉매 코팅방법에 따른 기능성 여과포의 NO 제거 반응 특성
강민필,송윤섭,이효송,김상도,박영옥,황택성,이영우 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6
NO_x와 먼지 동시 제거용 기능성 여과포 개발의 일환으로 V_2O_5/TiO_2계열의 상용촉매를 사용하여 P-84, Nomex, PTFE 여과포에 코팅하였다. 사용된 코팅 방법은 Sol-gel법, Spray법 그리고 Dip코팅 방법이었으며 코팅방법이 여과포의 NO_x 제거반응에 미치는 영향을 조사하였다. NO_x 제거반응실험은 여과포의 작동온도에 맞는 100-250℃의 반응온도범위에서, 공간속도 5,000hr^-1, 산소농도 6%, NH_3/NO 몰비는 1.0의 조건하에서 수행되었다. 본 연구에서 시도된 세 가지 코팅 방법 중 촉매량의 조절 및 균일한 코팅이 용이한 Sol-gel법에 의해 제조된 기능성여과포가 가장 좋은 NO_x 전환율을 나타냈다. A series of fabric filters including P-84, Nomex and PTFE were coated with a commercial V_2O_5/TiO_2 catalyst as an effort to develop a functional fabric filter of simultaneous removal of dust and NO_x. The coating methods employed are solgel coating method, spray coating method and dip coating method, and the effects of coating method on NO_x removal performance of functional fabric filter were investigated. Experimental conditions are as follows: the temperatures of 100-250℃ which are the normal operating temperature range of fabric filters, the space velocity of 5,000hr^-1, the oxygen concentration of 6%, and the NH_3/NO ratio of 1.0. Results showed that the sol-gel coating method gave the best NO_x removal performance mainly due to its ability in controlling the amount of catalyst and uniform coating.
서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
골다공증 유도 백서경골에 티타늄 임플란트 매식 시저출력 초음파 적용이 골 치유에 미치는 영향
황영섭(Young-Seob Hwang),전현준(Hyun-Jun Jeon),신상훈(Sang-Hun Shin),정인교(In-Kyo Chung),김규천(Gyoo-Cheon Kim),김철훈(Chul-Hoon Kim),김욱규(Uk-Kyu Kim) 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.5
Introduction: Osteoporosis is a major health problem in the elderly that involves changes in the properties of bone as well as impaired bone healing around a titanium implant in both humans and animals. This study examined effect of low intensity pulsed ultrasound (LIPUS) on the bone healing process around a titanium implant in osteoporosis-induced rats. Materials and Methods: Sixteen rats were divided into two groups. A control group with osteoporosis induced by removing both ovaries and an experimental group of rats that were applied with LIPUS after osteoporosis had been induced. A screw type titanium implant (diameter, 2.0 mm: length, 3.5 mm, Cowell-Medi, KOREA) was placed into the tibias of 16 rats. The control and experimental group contained 8 rats each. The rats were sacrificed at 1, 2, 4, and 8 weeks after implantation to examine the histopathology and immunochemistry. Results: The histopathology examination revealed earlier new bone formation in the experimental group than the control group. In particular, at 1 week after implantation, more new bone matrix and collagen were observed around the implant of the experimental group compared to the control group. Immunochemistry analysis showed that the level of OPG expression of the experimental group was higher in the early stages than in the control group. After 8 weeks, the levels of OPG expression were similar in both groups. The expression level of receptor activator of nuclear factor kB ligand (RANKL) was stronger in the experimental group than the control group. After 4 weeks, the level of RANKL expression was similar in both groups. Conclusion: These results suggest that the application of LIPUS to implantation can promote bone healing around titanium in osteoporosis animals.
박영섭(Young-Seob Park),김기청(Ki-Chung Kim),서흥수(Heung-Soo Suh),김영철(Young-Cheol Kim),조배호(Bae-Ho Cho),황용수(Yong-Soo Hwang) 한국원예학회 2008 원예과학기술지 Vol.26 No.1
동양배에서 발생하고 있는 배 과피얼룩병은 증상적으로는 미국이나 일본에서 발생하는 sooty blotch와 유사하나, 병원균에 있어서는 앞에서 언급한 바와 같이 전혀 다른 균들이 관여하고 있는 것이다.이들 여러 가지 병원성 관련균114종을 병원성을 확인하였고, 검출빈도가 가장 높은 것은 74.4%를 점하는 Cladosporium spp.이고 기타 균들인 Leptosphaerulina, Tilletiopsis, Tripospermum, Sporobolomyces 및 Mycelia Sterilia은 각각 5~7%이므로, Cladosporium 균이 과피얼룩병을 일으키는 가장 중요한 병원균이라 할 수 있다. This new disease was named as skin sooty dapple disease of Asian pear, and isolated 123 isolates from the infected plants. After bioassay for pathogenicity of each isolate, 114 isolates were selected for further studies. Each isolate was identified by morphological characteristics under microscopic observations. The isolates were identified as Cladosporium, Tripospermum, Tilletiopsis, and Leptosphaerulina, and some isolates did not form any spore. Among the isolates, 74% of the isolates were identified as Cladosporium spp., 5-7% of the isolates were identified as Leptosphaerulina, Tripospermum, Tilletiopsis, and unidentified species, respectively. This result indicates that Cladosporium isolates could be main pathogens for skin sooty dapple disease of Asian pear. In addition, only Cladosporum isolates caused mild maceration on pericarp by injection of inoculum suspensions.
농촌지역개발 지역역량강화사업이 사회적 자본형성과 사업참여의도에 미치는 영향
황영섭 ( Hwang Young Seob ),조동범 ( Cho Tong Buhm ) 한국농촌계획학회 2021 농촌계획 Vol.27 No.1
Social capital is the basis for enabling regional development, and although it is the result of regional development that produces greater productivity through the combination of human and material capital, there is a lack of discussions in connection with rural development. This study saw that the local capacity building project affects the social capital of the local residents and such social network is realized through the rural area development project based on the participation of the residents. As a result of the analysis, the regional capacity building project has a positive influence on the social capital of the region and the willingness to participate in the project, and bridge-type social capital has shown a mediating effect on education and consulting fields. Only when local social capital, especially bridge-type social capital, is cultivated through the regional capacity building project can the project be transformed into one suitable for local conditions through active participation of residents.