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Prevalence of bovine tuberculosis in dairy cattle in Korea from 1961 to 2004
Yoon, Hachung,Chung, Byung-Hyun,Yoon, Chong-Sam,Lee, Joo-Ho,Moon, Oun-Kyoung,Park, Seung-Yong,Lee, Won-Chang,Kim, Tae-Jong The Korean Society of Veterinary Science 2008 大韓獸醫學會誌 Vol.48 No.1
The trend in the prevalence of bovine tuberculosis (BTB) in Korean dairy cattle was investigated in relation to test programs used between 1961 and 2004, during which a total of 8,961,061 dairy cows were tested and 10,248 confirmed to have BTB. The annual prevalence increased in the late 1960s, then decreased during the 1970s and 1980s, and started to increase again from the late 1990s. It seemed that the prevalence varies according to the different test program used. The prevalence of BTB was higher when the tests were performed with heat-concentrated synthetic medium (HCSM) or purified protein derivative (PPD) tuberculin alone compared to that when using combined HCSM and PPD tuberculin testing.
Chlorella ellipsoidea mitochondria의 인지질 생합성과 지방산 대사에 미치는 항생제의 효과
Yoon. Seung-Hee,Seo. Kwang-Seok,Lee. Chong-Sam 한국환경보건학회 1997 한국환경보건학회지 Vol.23 No.3
The biosynthesis of phospholipid and the composition of fatty acid in C. ellipsoidea mitochondria treated with antibiotics(cycloheximide, nalidixic acid) during the culture analyzed. The growth of Chlorella and the contents of total lipid in mitochondria treated with antibiotics were lower than those of the control. The synthesis of PC (phosphatidylcholine) and PI(phosphatidylinostiol) were inhibited in the nalidixic acid treatment and also the contents of PC(phosphatidylcholine), PE (phosphatidylethanolamine), PG(phosphatidylglycerol) and PI(phosphatidylinositol) in the cycloheximide treatment were also inhibited. The major fatty acids utilized for the various phospholipids formation in each antibiotics treatment were analyzed stearic acid, myristic acid, palmitic acid, oleic acid, linoleic acid and linolenic acid at the late phase of the culture. Cycloheximide와 nalidixic acid를 처리한 배지에 Chlorella ellipsoidea를 배양하였을 때 mitochondria의 인지질 생합성과 그의 지방산 조성에 어떤 영향을 미치는 가를 분석하였다. 생장율과 total lipid 함량은 항생제 처리구에서는 대조구보다 낮게 나타났다. PC와 PI의 합성은 nalidixic acid 처리구에서는 억제되었고, PC, PE, PG 그리고 PI의 함량은 cycloheximide 처리구에서 억제되었다. 항생제 처리구에서 여러가지 인지질 형성에 이용된 주요 지방산은 배양 말기에 stearic acid, myristic acid, palmitic acid, oleic acid, linoleic acid 및 linolenic acid들 인것이 분석되었다.
Yoon, Seung-Hee,Jang, Jae-Seon,Lee, Chong-Sam Korean Society for Biochemistry and Molecular Biol 1996 Journal of biochemistry and molecular biology Vol.29 No.4
The biosynthesis of phospholipid and the composition of fatty acid were analyzed in mitochondria isolated from Chlorella ellipsoidea treated with carbon sources (glucose, sucrose, raffinose) during the culture. The growth of Chlorella and total lipid contents in mitochondria treated with various carbon sources was increased to compare with the control. When Chlorella mitochondria was treated with various carbon sources, four kinds of phospholipid were increased predominantly. The major fatty acids utilized for the biosynthesis of the phospholipid were analyzed linoleic acid (average 25.18%) and stearic acid (average 10.52%) in the control. But, it was shown that the major fatty acids in Chlorella mitochondria treated with glucose were stearic acid (average 30.93%), palmitic acid (average 17.47%) and stearic acid (average 20.31%), linoleic acid (average 16.68%) in sucrose treatment and oleic acid (average 17.17%), palmitic acid (average 15.64%) in raffinose treatment.
Symbol timing synchronization algorithm for DBO-CSS in dense multipath environment
Yeong-Sam Kim,Chang-Jin Choi,Sang-Hun Yoon,Jong-Wha Chong,Yong-Sun Jin 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we propose a new fullchirp-byfullchirp decoding method for differentially biorthogonal chirp spread spectrum (DBO-CSS). In DBO-CSS, the information is carried on the differential phase not between the adjacent sub-chirp symbols but between the sub-chirp symbols in the same position of adjacent full-chirp symbol. So, the conventional multiple symbol differential detection (MSDD) algorithms to enhance the BER performance can not be applied to the DBO-CSS directly. In this paper, we propose a modified MSDD which has the weighted decision rule. It is shown that the performance gain of the proposed algorithm when compared with that of the conventional detection algorithm is around 2.5㏈ at BER = 10??.
Cho, Chong Pyo,Jo, Sangpil,Kim, Ho Young,Yoon, Sam S. Taylor Francis 2007 NUMERICAL HEAT TRANSFER PART A-APPLICATIONS - Vol.52 No.12
<P> The two-dimensional laminar combustion characteristics of coal particles at various oxygen concentration levels of a surrounding gas have been numerically investigated. The numerical simulations, which use the two-step global reaction model to account for the surrounding gas effect, show the detailed interaction among the inter-spaced particles, undergoing devolatilization and subsequent char burning. Several parametric studies, which include the effects of gas temperature (1700 K), oxygen concentration, and variation in geometrical arrangement of the particles on the volatile release rate and the char burning rate, have been carried out. To address the change in the geometrical arrangement effect, multiple particles are located at various inter-spacings of 4-20 particle radii in both streamwise and spanwise directions. The results for the case of multiple particles are compared with those for the case of a single particle. The comparison indicates that the shift to the multiple particle arrangement resulted in the substantial change of the combustion characteristics and that the volatile release rate of the interacting coal particles exhibits a strong dependency on the particle spacing. The char combustion rate is controlled by the level of oxygen concentration and gas composition near particles during combustion. The char combustion rate is highly dependent on the particle spacing at all oxygen levels. The correlations of the volatile release rate and the change in total mass of particles are also found.</P>
3 - Oxo - 1,2 - benzisothiazole - 1,1 - dioxide 유도체들의 합성 및 Pyricularia oryzae 에 대한 항균성에 관한 연구
이종광,윤용진,박창석,최삼용 한국농화학회 1986 Applied Biological Chemistry (Appl Biol Chem) Vol.29 No.2
도열병균에 의한 벼의 목 및 잎도열병에 효과가 좋은 새로운 살균제의 개발을 시도하였다. 농약으로 예상되는 몇몇 3-oxo-1, 2-benzisothiazole-1, 1-dioxide의 새로운 유도체들을 합성하고, 이들 유도체들의 도열병균 (Pyricularia oryzae)에 대한 항균성을 agar medium dilution 방법에 의해 측정하였다. 3-oxo-1, 2-benzisothiazole-1, 1-dioxide의 5원자 고리의 3개 구조 단위중에서 가장 항균성이 큰 단위는 R-S-C=N-SO₂- 단위이며, 3개 구조 단위의 항균성 순서는 RS-C=N-SO₂- ≥ RO-C=N-SO₂- > -CNR-SO₂-였다. 30개 후보화합물 가운데서 14개의 유도체가 도열병균에 효능이 좋은 것으로 알려진 oryzemate 보다 우수한 항균성을 나타냈다.