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나프탈렌슬폰산 축합물계와 말레인산 공중합체계 콘크리트용 유동화제가 첨가된 시멘트 현탁용액의 거동
노재성,류호석,조헌영 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.1
The behavior of adsorption, the variations of zeta potential, the behavior of sedimentation in the cement suspensions added with Naphthalene Sulfonated Formaldehyde Condensate (β-NSF) and Maleic Anhydride Copolymer (MA) were investigated. Also the variations of mini slump, the time evolutions of mini slump and the setting times of the cement pastes fluidity with β-NSF and MA were tested. From this research, it is cleared that β-NSF has a strong effect on the fluidized of the cement paste and MA affects to keep the fluidity of the paste for a long time.
Benzoate에서 배양된 Acinetobacter baumannii로부터 Catechol 1,2-dixoygenase의 정제와 촉매적 성질
송승열,오계헌 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.2
The purpose of this work was to perform the catalytic properties and sequence analysis of catechol 1,2-dioxygenase (C1,2O) purified from Acinetobacter baumannii which was grown on benzoate as a carbon source. C1,20 demonstrated its enzyme activity to other substrates, catechol and 4-methylcatechol. The optimum temperature of C1,20 was 35℃, and the optimal pH was in the range from pH 7.5 to 9. Ag^+, Hg^+, and Cu^+2 showed inhibitory effect on the activity of C1,20. Molecular weight of the enzyme was determined to approximately 36 kDa by SDS-PAGE. N-terminal amino acid sequence of C1,20 was analysed as ^1MNYQQIDALVKQMNVDTAKG^20 and exhibited 95% sequence homology with that of C1,20 from Acinetobacter radioresistens. For internal sequencing analysis, trypsin digestion and peptide mapping were performed. Molecular weights of three digested peptide fragments were analyzed as 966.3 dalton, 1933.8 dalton and 2081.7 dalton by MALDI-TOF, which were matched with internal sequences (^1SQSDFNLRR^9, ^1TIEGPLYVAGAPESVGFAR^19, ^1HGNRPSHVHYFVSAPGYR^18)of Acinetobacter radioresistens.
인터리버를 이용한 eHDR-WPAN 시스템의 성능 분석
정승희,이현재,오창헌 한국기술교육대학교 2006 論文集 Vol.12 No.1
In this paper, we propose a performance of improvement method for eHDR-WPAN system with Interleaver. The pattern of burst error caused by fading in indoor wireless channel. For the reason, using of Interleaver(make burst error to random error) can be enhanced to error-rate in eHDR-WPAN system. Interleaver at the simulation considered Convolutional, Block and Random, respectively. Available symbol spacing of Interleaver is assumed 9 and 27. In results, Block-Interleaver is shown that a performance of improvement about 0.6dB of E_(b)/N_(o) at 10^(-4). Therefore, the suitable Interleaver for eHDR-WPAN system was 9 symbol spacing of Block Interleaver.
서승록,신승헌 대구대학교 산업기술연구소 1984 産業技術硏究 Vol.3 No.-
This paper was analnzed the 1,622 traffic accidents of kyounbuk area provided by the police bureau in 1982 and showed the precautionary measures of traffic accidents by using data sheets. This research suggestds as follows: 1. Strengthening of traffic rules and educations. 2. Investigation of accident patterns. 3. Improvement of driver's labour conditions. 4. Installation of safety devices. 5. Study of human engineering of traffic indicators. 6. Improvement of driving test
환경오염원으로서 Benzoate에 노출된 Acinetobacter sp. KS-1의 생존과 형태변화
송승열,오계헌 순천향대학교 기초과학연구소 2002 순천향자연과학연구 논문집 Vol.8 No.2
The purpose of this work was to investigate the survival and morphological changes of Acinetobacter sp. KS-1 when exposed by benzoate as an environmental stressor. The strain KS-1 was isolated from environmental samples around hospitals and could utilize benzoate as the sole source of carbon and energy. Strain KS-1 was examined the physiological and biological characteristics. Physiological analysis using BIOLOG GN2 MicroPlate system was performed to identify the strain, which could be assigned to genus Acinetobacter and designated as Acinetobacter sp. KS-1. Microscopic examination of the strain revealed Gram-negative and short rod cells. Survival of Acinetobacter sp. KS-1 cells was examined in different concentrations of benzoate. Survival of the KS-1 cell had less effect on the concentrations of 10 mM, 100 mM, or 500 mM of benzoate, whereas significant decrease of survival rates was measured at 1 M benzoate. Scanning electron microscopy was used to examine the morphological changes of Acinetobacter sp. KS-1 cells depending on the different concentrations of benzoate. However little morphological changes of the cells were observed in this experiments.
오염기름 제염에 있어 초임계 이산화탄소의 사용 타당성 연구
박승현,박광헌 慶熙大學校 材料科學技術硏究所 1998 材料科學技術硏究論集 Vol.11 No.-
The main object of this study is a possible use of supercritical fluid in decontamination of contaminated mechanical parts and dresses used in nuclear power plants. Supercritical CO_(2) is a good solvent for cleaning these materials, since it has a powerful ability of penetration to unreachable places and high solubility of oils. And the solubility changes dramatically according to the pressure change, so contaminants can be collected without making any secondary waste. In this study, solubility and removal efficiency of pure oil, gear oil, and grease were measured using supercritical CO_(2) dry cleaning method. The solubility of several oils was shown to increase with pressure ranging from 80 to 200 bars. The removal efficiencies of oil in cleaning mothods using water and that using perclorethylene were compared to dry cleaning with supercritical CO_(2). Oils were removed over 99% in supercritical CO_(2) and in percloroethylene ; however, most of oil was remained in the case of water washing at 60℃. In nuclear power plants, main components of radioactive wastes to be removed are Cs and I. Cs and I were completely removed when we used the water washing method, while percloroethylene and supercritical dry cleaning method couldn't remove Cs and I. To eliminate these components, we used modifier, i.e., a mixture of ethanol and pure water. The results show that removal efficiency of Cs and I in supercritical CO_(2) greatly increases with addition of ethanol and pure water. If this technique becomes materialized, there will be no or less secondary waste for decontamination of contaminated parts and dresses, resulting in more environmentally clean nuclear power plants.
노인정신의학 연구의 발전 방향 : 알쯔하이머병을 중심으로 Research on Alzheimer's Disease
김승현,이헌정 大韓神經精神醫學會 2002 신경정신의학 Vol.41 No.5
알쯔하이머병(AD)은 전반적인 인지기능의 저하를 보이는 진행성 치매이며, 병리학적으로는 amyloid plaque와 neurofibrillary tangle이 특징적이다. 최근 십여 년 동안 AD의 병태생리에 대한 연구에 있어 중요한 진전이 있었으며, 그로 인하여 질병 발생의 근원적 과정을 직접적으로 차단할 수 있는 새로운 치료적 시도들이 점차 가능해지고 있다. AD의 병인은 아직 확실하게 규명되지 않았지만 일반적으로 질병의 최종 공통경로로서 '아밀로이드 가설'이 가장 유력한 원인 가설로 인정받고 있다. AD를 치료하기 위한 새로운 전략들은 β-amyloid protein(Aβ)의 생산을 중단시키고, Aβ의 제거를 촉진하거나, Aβ의 응집과 침전을 방해하는 시도들이다. 저자들은 본고에서 AD에 대한 현재까지의 연구성과를 요약하고 최근 새롭게 주목받고 있는 치료적 접근 방법에 대해 간략하게 설명하려고 한다. Alzheimer's disease(AD) is a progressive dementia characterized by global cognitive decline and is defined pathologically by amyloid plaques and neurofibrillary tangles. In the past 10 years, important progress has been made in the understanding of the pathogenic mechanism of AD, and new therapeutic targets have become available that should allow the underlying disease process to be tackled directly. In this respect, the 'amyloid hypothesis' has been become the dominant theory in the cause of AD. New strategies for conquering the AD include attempts to stop the production of β-amyloid protein(Aβ), increasing Aβ clearance, or interfere with Aβ aggregation and precipitation into fibril or plaques. This review summarizes recent advances in research on AD and inspects the perspective of research in potential therapies of AD.
알코올의 수분함량과 몰비 변화에 따른 실리콘알콕사이드(TEOS·TMOS)의 수율
노재성,조헌영,홍성수,조태웅 忠南大學校 産業技術硏究所 1993 산업기술연구논문집 Vol.8 No.1
Silicon alkoxides(TEOS:tetraethylorthosilicate and TMOS:tetramethylorthosilicate) were synthesized from silicon tetrachloride and ethanol or methanol with the variation of the mole ratio (alcohol/SiCl_4) and the water contents in the alcohol. The optimum mole ratios of alcohol/SiCl_4 were measured to be betweem 4 and 5 and the reactions completed within one hour. The yield of TEOS decreased from 70% to 48% as the water contents increased from 0.1% to 1.0% in ethanol.
청양 지역에 분포하는 트라이아스기 후기의 조계리층에서 산출된 규화목 화석
김종헌,백승덕,이원국 공주대학교 과학교육연구소 2003 과학교육연구 Vol.34 No.-
충남 청양 지역에 분포하는 트라이아스기 후기의 조계리층에서 규화목 화석이 발견되었다. 규화목 화석의 산출은 남한에 분포하는 하부중생계 지층에서 최초의 기록이다. 분류학적 연구결과, 구과류에 속하는 Xenoxylon sp.와 Dadoxylon sp.의 2속 2종이 식별되었다. 본 논문에서 구과류 화석의 특징과 비교 및 그 의미에 대해서 고찰하였다. Petrified wood fossils are discovered from the Upper Triassic Jogyeri Formation distributed in the Cheongyang area. The occurrence of petrified fossils is the first record in the Lower Mesozoic strata distributed in South Korea. As a result of anatomical study of wood fossils, two specie belonging to two genera of Xenoxylon sp. and Dadoxylon sp. which belong to conifers, are recognized. This paper deals with the characteristics, comparison and significance of conifer wood fossils.
이승헌,류순호,설수일,안열,정영상,이상모 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-
This study was carried out to obtain the basic data for selecting the applicable crops in reclaimed land during desalinization period. A pot experiment was conducted with 5 different electrical conductivities of the saturated extracts (ECe 1, 3, 9, 14, and 16 dS·m^(-1)) of soils taken from the Dae-Ho reclaimed tidal lands. Eight crops (Chinese cabbage, radish, tomato, red pepper, buckwheat, soybean, sesame, and green perilla) were grown for 37days. Plant height and number of leaves were surveyed on 2 and 4 weeks after seeding, and on harvest time (5 weeks). After harvest, dry weights of harvested crops were measured and soil chemical properties were analyzed. Emergence rates of crops were comparatively high except sesame. For sesame, there was no emergence at ECe over 3 dS·m^(-1). Growth and dry weight decreased significantly as increasing ECe. The ECe which decreased 50% of dry weight index were 14.2 dS·m^(-1) for radish, 11.4 dS·m^(-1) for Chinese cabbage, 10.2 dS·m^(-1) for tomato for red pepper, 8.9 dS·m^(-1) for buckwheat and green perilla, 8.6 dS·m^(-1) for soybean, and 8.9 dS·m^(-1) for tomato. At higher ECe that start the growth inhibition, increasing 1 dS·m^(-1) in ECe, 7.7, 6.5, 5.9, 5.6, 5.2, and 4.9% of dry weight decreased for buckwheat, green perilla, Chinese cabbage, radish, soybean, and tomato (red pepper), respectively. The critical value of ECe for crop survival except sesame was 15.4~23.1 dS·m^(-1).