한우 포유모우의 산유량및 유조성분에 관한 연구 1 . 포유모우의 산유량 추정방법 확립에 관한 연구

강수원(S . W . Kang),정연후(Y . H . Chung),정창화(C . H . Chung),나승환(S . H . Na),손용석(Y . S . Son),백동훈(D . H . Baik) 한국축산학회 1989 한국축산학회지 Vol.31 No.3

This experiment was conducted to establish the estimating of dam`s milk producing capacity which forms the basis of Korean Native Cattle improvement for 3 years from 1982 to 1984. Four methods, including weight difference of the calf before and after nursing, hand milking and machine milking were compared with a new milking while the calf nurses, which the good points from the existing methods were extracted and then were developed. Fifty nine heads of nursing cow were tested to investigate dam`s milk yield. dam`s milk composition by the new milking method for 3 years from 1985 to 1987. The results of this experiment are summarized as follows: 1. This new method was made to use a portable vacuum·operated bucket milker in two quarters of each cow`s left or right udder while the calf suckles two quarters of his or her dam`s right or left udder. On this method. cows and calves were seperated at 8:00 am and at 5:00 pm the calves allowed to nurse. Cows and calves remained seperated over night. At 8:00 am and 5:00 pm the following day, the calves allowed to nurse one udder half while the rest was milked by machine. 2. On the comparison with methods estimating dam`s milk yield, the method by calf-weight difference before and after nursing wasn`t exact and good method in estimating dam`s milk yield and composition because not only this method was indirectly estimated by calf`s weight gain but also milk sample could not be taken. And also, the method by hand milking and machine milking could be surveyed only 60 days and 4 to 10 days, respectively, because dam`s milk yield was rapidly decreased with passing the milking day. However, by the new method, milking could be completely done without failure for 180 days and samples for analyzing the milk composition could be taken more easily and exactly than any other method. 3. Daily average and total milk yield of fifty nine heads investigated by this new method for 180 days was 3.48 and 625.8kg, respectively. 4. In the milk composition, total solids, far, protein, lactose and ash content was 14.21, 4.64, 4.07, 4.21 and 0.89 percent, respectively.

선택적 촉매 산화 반응에 의한 황화 수소의 제거 Ⅱ . TiO2 / SiO2 촉매 상에서 황화 수소의 선택적 산화 반응

천승우,박대원,우희철,홍성수,정종식 ( S . W . Chun,D . W . Park,H . C . Woo,S . S . Hong,J . S . Chung ) 한국공업화학회 1996 공업화학 Vol.7 No.4

본 연구는 H₂S를 TiO₂/SiO₂촉매상에서 산소와의 직접 산화 반응을 통해 원소 황의 형태로 제거하는 반응에 관한 것이다. 순수한 TiS₂Ti(SO₄)_2를 사용한 반응 실험과 순수한 TiO₂에 대한 주기적 온도 조작 실험 결과로부터 TiO₂는 황 회수 공정에서 사용되는 촉매의 비활성화의 주원인으로 알려진 sulfation이나 salfidation에 대해 매우 안정한 것으로 나타났다. TiO₂/SiO₂촉매에서 TiO₂의 담지량이 증가함에 따라 H₂S 전화율이 증가하였고, 원소 황의 선택도는 아주 소폭으로 감소하였다. 반응 실험결과 O₂/H₂S의 비가 증가할수록 원소 황의 선택도는 크게 감소하였다. 10 wt.% TiO₂/SiO₂ 촉매는 화학 양론비의 조성(H₂S=5 vol.% O₂=2.5 vol.%)의 반응물에 10 vol.%의 수증기를 첨가한 경우 활성과 선택도가 감소하였으나 여전히 80% 이상의 원소 황 수율을 유지하고 있었다. Selective catalytic oxidation of H₂S to elemental sulfur using TiO₂/SiO₂ catalysts was investigated in this study. The reaction test with pure TiS₂and Ti(SO₄)₂and cyclic temperature operation revealed that TiO₂had a good resistance to sulfation and sulfidation, which are known as the main cause of catalytic deactivation in sulfur recovery process. With the increase of TiO₂loading amount in Tio₂/SiO₂catalysts, the conversion of H₂S increased and the selectivity of elemental sulfur was very slightly decreased. As the ratio of O₂/H₂S increased, the selectivity to elemental sulfur was drastically decreased. In the presence of 10 vol.% water vapor to a stoichiometric mixture of H₂S and O₂(H₂S =5 vol.% O=2.5 vol.%), both activity and selectivity of 10 wt.% TiO₂/SiO₂catalyst are decreased, but it still showed more than 80% of sulfur yield.

1987년 한국에서 발생한 렙토스피라병의 혈청역학적 조사

이증훈,박영수,이우곤,김석용,정선식,우준희,박성광,박경희,송영욱,김선영,기정일,최두혁,강성귀,김주완,최강원,김우열,최명식,최인학,장우현,윤성열 대한감염학회 1988 감염 Vol.20 No.3

Human leptospirosis was an unfamiliar disease in Korea until 1984 that outbreak of leptospirosis occurred among farmers and soldiers after field works for harvesting rice. During that time, Lee and Jo confirmed the first Korean cases of leptospirosis by serological test, isolation of causative agent and autopy findings. Afterward several outbreaks occurred also during autumn especially after flood in every years and some characterisitcs of leptospirosis in Korea such as clinical manifestations, serotypes and seroepidemiological features has been revealed by many investigators. Because of the major mode of transmission between rodents and human is by direct contact with leptospiral urine of rodents or contaminated soil by the urine, leptospirosis in Korea has been primarily a disease of person in occupations heavily exposed to contaminated soil or infected urine such as farmer, army and etc. Therefore it seems that leptospirosis is one of the main communicable diseases to be controlled urgently in Korea, for an agricultural people account for almost half of total Korean people. For clarifying the seroepidemiological patterns of human leptospirosis in Korea by sex, month region and main reacting serovars of L. interrogans among acute febrile disease occurred in 1987, 1,773 patient's sers with acute febrile episodes were tested by microagglutination test using 19 representative strains of leptospiral serogroup as antigen. All of those sera were collected from 10 collaborative clinics located in Kyunggi, Kangwon, Chungbuk, Chungnam, Chonbuk, Chonnam province and Seoul. The results wee summerized as follows. 1) Among 1,773 sera of patients with acute febrile episodes, 219 (12.4%) were seropositive to L. interrogans, 487(27.5%) to R. tsutsugamushi, 241(13.6%) to R.typhi and 160(90.0%) to Hantaan virus. 2) Among seropositives to L.interrogans, the male outnumbered the female, 65% and 35%. 3) For age distribution, 26.9% of seropositives to L.interrogans were fifties, 19.6% were forties, 9.1% were sixties, 5.9% were thirties and 4.1% were twenties. 4) Eighty three percent of seropositives had occurred between September and October in 1987 with a peak in September. 5) Main leptospiral serovars reactive to patient's sera were Icterohaemorrhagiae(54.3%), Canicola(31.0%), CH-48(13.2%), Tarassovi(0.9%)and Cynopteri(0.5%). 6) For regional distribution, 65.8% of seropositives to L.interrogans were residents from Chonbuk, 12.3% were Chonnam, 7.3% were Chungnam, 5.5% were Kyunggi and 1.4% were Kangwon.

Salmonella Typhi, Salmonella Typhimurium 및 Salmonella Enteritidis의 항균제 감수성 (1997)

신영학,유정식,김기상,정동준,오경수,이점규,이상원,이근영,박미선,이복권,김호훈 국립보건연구원 1998 국립보건원보 Vol.35 No.-

난용종계의 난질의 유전력 및 유전상관에 관한 연구

상병찬,한성욱,오봉국,정선부 ( B . C . Sang,S . W . Han,B . K . Ohh,S . B . Chung ) 한국축산학회 1983 한국축산학회지 Vol.25 No.5

This study was conducted to improve the interior egg quality with a total of 6,093 eggs, laid at 351 Single Comb White Leghorns and 326 Rhode Island Reds, produced at National Livestock Breeding Station from March 1, 1979 through July 30, 1980. The results obtained are summarized as follows; 1. The average albumen height of the eggs at first eggs, 300 and 500 days of age was 8.32, 7.51 and 6.74㎜ in the S.C.W. Leghorn and 8.04, 6.94 and 6.05㎜ in the R.L.Red, and the Haugh units at first egg, 300 and S00 days of age was 90.92, 79.74 and 76.25 in the S.C.W. Leghorn, and 88.54, 80.02 and 74.56 in the R.I. Red, also the egg shell thickness at first egg, 300 and 500 days of age was 0.383, (1.364 and 0.334㎜ in the S.C.W. Leghorn and 0.354, 0.332 and 0.327 in the R.I. Red. 2. The heritability estimates in the S.C.W. Leghorn and R.I. Red were 0.398∼0.847 and 0.306∼0.634 for albumen height, 0.162∼0.594 and 0.125∼0.485 for Haugh units, 0.185-0.339 and 0.176∼0.402 for egg shell thickness, respectively. 3. The genetic correlation coefficients between the interior egg qualities were as follows. In the S.C.W. Leghorn and R.I. Red, the coefficients between albumen height and Haugh units, 0.432∼0.845 arid 0.397∼0.974; between albumen height and egg shell thickness, 0.046∼0.226 and 0.068∼0.197; between Haugh units and egg shell thickness, 0.089∼0.364 and 0.165∼0.327 ; respectively.

우리나라 시송전계통에 적용된 전력계통안정화장치(PSS)의 분석

이상성(S. S. Lee),이선영(S. Y. Li),이영진(Y. J. Lee),정우덕(W. D. Chung),장광수(G. S. Jang),민상원(S. W. Min),박종근(J. K. Park),문승일(S. I. Moon),이홍재(H. J. Lee),이경섭(K. S. Lee),강상희(S. H. Kang) 대한전기학회 2003 대한전기학회 학술대회 논문집 Vol.2003 No.11

Tribology Characteristics in 200 μm of Hexagonal Array Dimple Pattern

W. S. Choi,Angga S. H.,S. H. Kwon,S. G. Kwon,J. M. Park,J. S. Kim,S. W. Chung,Y. H. Chae 한국트라이볼로지학회 2015 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.31 No.2

This study investigates the effects of a pattern of 200 μm dimples in a hexagonal array on tribological characteristics. A textured surface might reduce the friction coefficient and wear caused by third-body abrasion and thus improve the tribological performance. There are three friction conditions based on the Stribeck curve: boundary friction, mixed friction, and fluid friction conditions. In this experiment, we investigate the friction characteristics by carrying out the friction tests at sliding speeds ranging from 0.06 to 0.34 m/s and normal load ranging from 10 to 100 N. We create dimple surfaces for texturing by using the photolithography method. There are three kinds of specimens with different dimple densities ranging from 10% to 30%. The dimple density on the surface area is the one of the important factors affecting friction characteristics. Friction coefficient generally decreases with an increase in the velocity and load, indicating that the lubrication regime changes depending on the load and velocity. The fluid friction regime is fully developed, as indicated by the duty number graph. Fluid friction occurs at a velocity of 0.14-0.26 m/s. The best performance is seen at 10% dimple density and 200 μm dimple circle in the hexagonal array.

PRELIMINARY SPECT STUDY OF I - 123 LABELED 3 - IODO - O - METHYL - L - α - METHYLTYROSINE (OMIMT) IN PATIENTS WITH BRAIN TUMOR

Lee, S . H .,Yang, S . D .,Hong, S . W .,Chung, W . S .,Jang, J . S .,Lim, S . M .,Woo, K . S .,Rhee, C . H .,Choi, C . W .,Lim, S . J . 대한핵의학회 1997 핵의학 분자영상 Vol.31 No.2

A Study on the pH Characterization for Microbial Fermentation in Tomato Juice

S.M. Choi,D. Supeno,Okka A.,S.W. Chung,H.S.Kim,J.S. Kim,J.M. Park,S.H. Kwon,S.K. Kwon,W.S. Choi 한국산업융합학회 2014 한국산업융합학회 논문집 Vol.17 No.3

This study was conducted to know the behavior of pH behavior in the tomato juices to find out an effective medium for microbial cultivation. Bacterial culture media is a material consist a mixture of nutrients used to grow microorganisms on or in it. In addition, microbial culture media can also be used for isolation, propagation, testing the nature physiological, and calculation of the number of microorganisms. Fresh tomato juice is used for basic ingredient, therein added salt, sugar and EM (Effective Microbial). The fermented solution placed in a room with a temperature of 40℃. Data retrieval before the pH value reached a constant value is done every 12 hours, after constant rate data collection was done every 24 hours. The pH value has been steady after 372 hours of fermentation process (15.5 days). From the results obtained that the amount of additional ingredient which added into tomato juice does not affect final pH value of solution. Thereby the most effective treatment for microbial cultivation media is treatment number four.

한우 육성빈우 (育成牝牛) 의 에너지와 단백질요구량 추정 1 . 대사시험에 의한 한우 육성빈우의 에너지와 단백질 요구량 결정

정연후(Y . H . Chung),이상철(S . C . Lee),강수원(S . W . Kang),정정수(C . S . Chung),정천용(C . Y . Chung) 한국축산학회 1992 한국축산학회지 Vol.34 No.5

Metabolism trial was carried out to estimate the energy and protein requirements for Korean native heifers. Nine heifer calves weighing about 150㎏ were randomly assigned into three target daily gains (0.2㎏, T₁; 0.6㎏, T₂; 0.8㎏, T₃) with interval of BW 50㎏ through BW 350㎏, aiming to estimate the energy and protein requirements. The amount of nutrient to be fed was based on NRC requirements (1984), and the ration consisted of hay, rice straw and grass silage as roughage source, and concentrate mixture. Average daily gains across body weight classes were 0.30(T₁), 0.62(T₂) and 0.67㎏(T₃), respectively. Except for crude fiber, digestibilities and nutritive values of experimental ration were increased with the increase of daily gain. As expected, nitrogen intake was significantly(P$lt;0.05) increased with the increase of daily gain, but there were no differences in digestible nitrogen intake and nitrogen retention between T₂ and T₃ group. Based on pooled data of body weight classes, nitrogen(N) and digestible nitrogen(DN) requirements were estimated as follows; N requirement(g/W^0.75/day) = 0.98+1.25DG-0.44DG² (R²=0.42**), DN requirement(g/W^0.75/day) = 0.40+1.19DG-0.24DG² (R²=0.49**) Metabolizable energy intake, heat production and energy retention tended to increase with the increase of daily gains, not with body weight, although there was no difference between T₂ and T₃ group. Energy losses expressed as % of gross energy(GE) intake was higest from feces(42.8%), followed by heat production(42.3%), and lowest from urine(2.0%). Total digestible nutrient(TDN), DE and ME requirements were as follows; TDN requirement(g/W^0.75/day) = 28.13+60.40DG-14.03DG² (R²=0.48**), DE requirement(㎉/W^0.75/day) = 134.34+ 220.59DG-71.90DG² (R²=0.54**), ME requirement(㎉/W^0.75/day) = 116.98+171.32DG-35.73DG²(R²=0.54**). Total digestible nutrient, DE and ME requirements for maintenance were 28.13g, 134.3㎉ and 116.98 ㎉/W^0.75/day, respectively. The estimated NEm requirement from the relationship between ME intake and heat production was 76.5㎉/W^0.75/day.