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고로슬래그시멘트를 사용한 다공성 황토콘크리트의 성능 평가
김황희,강수만,박종식,박상우,전지홍,이진형,차상선,박찬기,Kim, Hwang-Hee,Kang, Su-Man,Park, Jong-Sik,Park, Sang-Woo,Jeon, Ji-Hong,Lee, Jin-Hyung,Cha, Sang-Sun,Park, Chan-Gi 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3
This study aims to evaluate a porous concrete using hwang-toh, blast furnace slag and blast furnace slag (BFS) cement instead of type I cement. The tests that were carried out to analysis the properties of porous hwang-toh BFS cement concrete included compressive strength, continuous void ratio, absorption rate, and pH value, repeated freezing and thawing test were conducted. Test results indicated that the performance in porous hwang-toh concrete are effective on the kaoline based binder materials. The pH value were shown in about 9.5 ~ 8.5. The compressive strength was increased and void ratio was decreased with increasing the kaoline based binder materials, respectively. The void ratio and compressive strength were in the range of about 21 ~ 30 %, 8 ~ 13 MPa, respectively. The increased in void ratio of more than 25 % is showed to reduce the resistance of repeated freezing and thawing. Also, the resistance of repeated freezing of thawing and the compressive strength of porous hwang-toh BFS cement concrete are independent with hwang-toh content and BFS cement amount. But, the void ratio was decreased with increasing the high volume hwang-toh contents (more than 15 %).
Coating with boron nitride on SiC fiber using atomic substitution
Woo‑Seong Tak,Jin‑Uk Hwang,Young‑Keun Jeong,Woo‑Sik Kim 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.2
To increase the mechanical properties of ceramic matrix composite, it is important that formation of lubricant layer for crack deflection between matrix and fiber. Therefore, we fabricated uniform boron nitride (BN) lubricant layer using atomic substitution method. Silicon carbide (SiC) fiber surface was modified with amine groups using (3-amonipropyl)triethoxysilane to coat SiC fiber with BN as a solid lubricant. Then, surface was coated with graphene oxide (GO). Boric acid powder was supplied to the GO-coated fibers and the samples were heat-treated at 1200–1400 ℃ under N2 and NH3 atmospheres. An uniform BN layer could be coated on SiC fiber with 10 nm-1.11 μm. Crystallinity and thickness of BN layer could be controlled by reaction temperature. It was also confirmed that crystalline BN formed under process conditions of higher than 1400 ℃.
황원주 ( Hwang Won Ju ),김종우 ( Kim Jong Woo ),하상수 ( Ha Sang Su ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
The purpose of this experimental study is to increase the strength of mortar mixed with activated Hwang-Toh (AHT) and granulated blast furnace slag (GGBS) as a compound for the development of eco-friendly concrete. The compressive strength test was carried out by making mortar specimens with a certain ratio of AHT and GGBS. The percentage of AHT were at 30% and 50% and the GGBS were a 40% and 50% as Major variables. The results of this study showed that for specimens with percentage of AHT at 30% with GGBS increased above the strength of the mortar without the binding. However, the compressive strength of experimentation with percentage of AHT at 50% with partially replace GGBS has decreased by more than the mortar without the binding. Therefore, further study is deemed necessary.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
김종우 ( Kim Jong Woo ),황원주 ( Hwang Won Ju ),하상수 ( Ha Sang Soo ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
The purpose of this study is to compare the compression strength of gypsum substituted mortar with that of mortar. After replacing the cement with the loess, a portion of the remaining cement was replaced with gypsum to make specimens. When the gypsum is replaced, the strength of all the specimens is lower than that of the standard specimen. It is necessary to use a long-term strength mixed material to replace this.
황희숙,황재문,이우승,김점순,김병수 慶北大學校農業科學技術硏究所 1998 慶北大農學誌 Vol.16 No.-
국내외로부터 수집한 고추 유전자원을 포장에 재배하여 종자를 증식하는 동시에 주요 특성을 조사하였다. 헝가리에서 도입하여 1992년도에 평가한 계통들은 Hungarian Wax 혹은 Bell형으로서 바이러스에 심하게 걸려 우리포장환경에 잘 적응하지 못하였다. 1994년도에 평가한 계통들 중 브라질에서 풋마름병 저항성으로 도입한 KC350과 KC351은 직립성이며 바이러스에 강한 편이어서 매우 유망한 유전자원으로 사료되었다. 중국에서 도입한 KC376는 바이러스에 강한 편이며 대과를 착생하여 유망하게 보였다. 태국에서 도입된 계통들은 안동대에서 특성을 평가기록하였다. Accessions of pepper germplasm were planted in the field and their characteristics were recorded. Lines introduced from Hungary were very susceptible to virus diseases and as a result poor in adaptability in domestic field condition. KC350 and KC351 which were introduced from Brazil were growing errectly and tolerant to both bacterial spot and virus diseases. KC376, an introduction from China, was bearing large fruits with tolerance to virus. Introductions from Thailand were grown and evaluated in Andong Universiy, and major characters of them were recorded.
황우신,황성주,박정숙,조정원 충남대학교 약학대학 의약품개발연구소 2012 藥學論文集 Vol.27 No.-
Nanotechnology affects on various aspects including medicine and pharmaceutics. This nanocrystal technology which transforms to nano-sized material is able to develop the innovational formulation strategy for poorly water-soluble drugs due to the change of physicochemical properties of drug. Scale-up methods using pearl milling or high pressure homogenizer was described and commercialized products based on nanotechnology were introduced in this manuscript.
바이오 디젤유 생산을 위한 대두유 에스테르화 반응의 속도론적 연구
황우람,신용섭 慶星大學校 環境問題硏究所 2002 環境硏報 Vol.12 No.1
The esterification of vegetable oil with methanol is one of the best ways to improve it's combustion characteristics. Therefore, in this study, the process which produce the bio-diesel oil from vegetable oil by the esterification reaction was investigated. Especially, the kinetic study on the esterification reaction of soybean oil was performed. Catalysts used in this study were sodium hydroxide as a homogeneous catalyst and calcium hydroxide as a heterogeneous catalyst. Because sodium hydroxide reacted with free fatty acid in the soybean oil and 0.5wt% of the sodium hydroxide was greater than the free fatty acid content in the soybean oil, it is very important for the completion of esterification reaction that the free fatty acid in the soybean oil should be removed before the esterification reaction. Compared with reaction rate constant of the esterification reaction rate constant of saponification had constant value in case of using sodium hydroxide catalyst. Interestingly, rate constant of the esterification reaction was decresed with increase of sodium hydroxide dosage. Compared with reaction rate constant of the esterification reaction, reaction rate constant of saponification had constant value in case of using sodium hydroxide catalyst. Interestingly, rate constant of the esterification reaction was decresed with increase of sodium hydroxide dosage. Using calcium hydroxide catalyste, reaction rate constants in FAMEs production step were Measured from 0.9141 min-1 to 1.0377 min-1, and reaction rate constants in monoglyceride and diglyceride production steps were measured from 0.0093 min-1 to 0.0386 min-1 according to the calcium hydroxide dosage. So, monoglyceride and diglyceride production steps rate controlling steps in overall esterification reaction.
한국판 정신질환의 내재화된 낙인 척도의 신뢰도 및 타당도 연구
황태연,이우경,한은선,권의정 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.5
Objectives : The Internalized Stigma of Mental Illness (ISMI) scale designed to measure the subjective experience of stigma with sub-scales measuring Alienation, Stereotype Endorsement. Perceived Discrimination, Stigma Resistance, and Social Withdrawal. The purpose of this study was to examine the reliability and validity of the Korean version of ISMI. Methods : The subjects were 194 schizophrenic patients and 205 peoples with depressive disorder. K-ISMI, CES-D (The Center for Epidemiologic Studies Depression Scale) and Self Esteem scale were performed. Results : Results showed that the ISMI had high internal consistence and split-half reliabilities. The internal consistency coefficients (Cronbach alpha) of each subscale ranged from .83 to .93. The validity of the ISMI was investigated by principal axis factoring analysis, yielding 5 factors of alienation, Perceived discrimination, negative stereotype, stigma resistance, devaluation and social withdrawal. 5 subscales explained 60.67% of total variance. Concurrent validity was supported by comparisons against scales measuring related constructs. As expected, the ISMI had positive correlations with CES-D, and it had negative correlation with self-esteem scale. Subsidiary analysis showed that schizophrenic patients showed higher internalized stigma than depressed patients. Conclusion : Overall, the findings support the utility of ISMl as a tool to evaluate internalized stigma of persons with mental illness. Interventions that can lessen internalized stigma may well hasten the recovery process in individuals with mental illness.