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디젤 엔진오일 내 Soot 함량 증가에 따른 오염도 측정에 관한 실험적 고찰
조성용(S.Y. Cho),공호성(H. Kong),윤의성(E.-S. Yoon),한흥구(H.G. Han),정동윤(D.-Y. Jung) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
New method and device for the on-line measurement of soot concentration in a diesel engine oil are proposed, where the measurement principle is based mainly on attenuated internal total reflection. Various laboratory tests of the detector were performed mainly with carbon black particles of different contamination levels. It was found that the proposed detector could be well used to monitor oil deterioration due to soot contamination. Operational range of the detector was found from 0 to 5 mass percentage of soot content. Test results with water and fuel dilution showed that these effects were not remarkable. However, adsorption of carbon black particles to a measurement surface was considered to be a critical problem in the new detector. Effects of particle deposition onto the interface was experimentally evaluated with the oil temperature and turbulence and discussed throughout this work.
이색법을 이용한 직접 분사식 디젤엔진의 화염 온도 및 Soot 분포 측정에 관한 실험적 연구
조성용(Cho S.Y),정수훈(Chung.S.H),주원석(Joo.W.S),박정규(Pakr.J.K) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this study, the flame temperature and KL value distribution in a DI diesel engine were measured by the two-color method. The accuracy of the temperature calibration of the measuring equipment was assured by characteristic curve of film made from a high temperature standard tungsten ramp. First, piston and cylinder of DI diesel engine were elongated and diesel flame in combustion chamber was photographed by a high speed camera on a nega-color film. The two-dimensional temperature and KL value distribution can be calculated from the radiant intensities on a nega-color film by using an image processing. The flame temperature and KL value were measured on various combustion chamber shapes.<br/>
비타민 A와 D의 공급제한이 거세 한우의 육질등급에 미치는 영향
김완영,박진기,조성용,남기택,여준모,Kim, W.Y.,Park, J.K.,Cho, S.Y.,Nam, K.T.,Yeo, J.M. 국립한국농수산대학교 교육개발센터 2016 현장농업연구지 = Journal of practical agricultural resear Vol.18 No.1
Sixty Hanwoo steers(15 months of age; 409±29.2 kg of BW) were used to evaluate the effects of dietary vitamins A and D restriction on carcass characteristics. Steers were allotted randomly to 1 of 4 treatments: Control(diet supplemented with vitamins A, D and E), -A (diet supplemented with vitamins D and E), -D(diet supplemented with vitamins A and E) and -AD(diet supplemented with vitamin E only). Steers were fed the experimental diet for a period of 8 months(until 23 months of age), and then supplemented with vitamins A and D at 0.05% of the diet(as fed-basis) from 24 to 26 months of age, and at 0.1% of the diet from 27 to 31 months of age(harvesting time). Dietary restriction of vitamins A and D did not affect DM intake, daily gain and feed conversion ratio. But the concentration of serum retinol was significantly(P<0.05) decreased by vitamin A restriction with the lowest concentration being seen at 23 months of age(345.0 ㎍/L and 326.7㎍/L for control and -D treatment versus 169.3 ㎍/L and 175.4 ㎍/L for -A and -AD treatments). The serum concentration of 25(OH)D<sub>3</sub> was also decreased significantly(P<0.05) by vitamin D restriction and the lowest concentration was seen at 18 months of age(53.7ng/ml and 61.8ng/ml for control and - A treatment versus 24.0 ng/ml and 24.5 ng/ml for -D and -AD treatments). After the restriction period of vitamins A and D, the concentrations of retinol and 25(OH)D<sub>3</sub> for - A, -D and -AD treatments were recovered at those of control. Dietary restriction of vitamins A and D did not affect carcass weight, backfat thickness, ribeye area, quality grade and yield grade. But marbling score was significantly increased by vitamin A restriction compared with control(6.73, 6.87 and 5.73 for -A, -AD and control, respectively). The results of the present study suggested that dietary vitamin A restriction could improve marbling score in Hanwoo steers.
김완영,박진기,조성용,남기택,여준모,Kim, W.Y.,Park, J.K.,Cho, S.Y.,Nam, K.T.,Yeo, J.M. 국립한국농수산대학교 교육개발센터 2016 현장농업연구지 = Journal of practical agricultural resear Vol.18 No.1
Vitamin D plays a vital role in maintaining blood concentrations of Ca and P. In lipid metabolism, vitamin D is also known to negatively affect the development of adipocytes, but it has received little attention with regard to improve marbling score in beef cattle via restricting its supply. Recently, the method of feeding fat soluble vitamins(including vitamin D)-deficient diets in Korean native cattle (Hanwoo) has been spread by feed companies and TMR plants. But proper guidelines in feeding vitamin D-deficient diets should be provided, otherwise it can adversely affect the health of cattle. To maximize marbling score, a controlled level of vitamin D in blood needs to be maintained and the proper period for feeding vitamin D-deficient diets should be provided. This review was conducted to highlight the regulatory effects of vitamins D on adipocyte differentiation, and provide information on improving beef quality grades in relation to feeding vitamin D-deficient diets in beef cattle.
屠畜豚에서 Pasteurella multocida의 分離, 分離株에 대한 微生物學的, 血淸學的性狀 및 抗生物質의 感受性 調査와 豚肺에 대한 病理學的 觀察에 관하여
이학철,함태수,정유열,조성용,이재현 영남대학교 자원문제연구소 1990 資源問題硏究 Vol.9 No.-
In recent years much attention has been paid to swine respiratory infection caused by Pasteurellα (P.) multocidα with rapid expansion of pork industry in Korea. The present study was performed to observe the etiologic situation of P. multocidα infection by bacteriological, serological (serotyping) and pathological examinations with the lungs, respectively. In addition antibiotic susceptibility test was carried out against the isolated strains of P. multocidα. The results obtained are as follows. 1. Eighteen strains (12.8% ) were isolated from the 140 cases of swine lungs examined, and biological and biochemical characteristics of the isolates were the same as those in the references of other workers, whereas some differences were observed in sugar fermentation and enzyme activity according the strain of isolates. 2. Capsular serotyping performed on 18 strains P. multocidα revealed that 13 strains (72.2%)were A type and 5 strains (27.8%) were D type, respectively. 3. When serotyping was performed against somatic antigen on 18 strains capsular types of which were indentified as described above 9 (50%), 3 (1 6.7%) and 4 (22.2%) strains belong to 1 : A, 3 : A, 2 : D, respectively, but untypable 2 strains (11.1%) were observed. 4. Antibiotic susceptibility test by employing disc method for 24 kinds of drugs revealed that 15 kinds of antibiotics were sensitive to 18 strains of P. multocidα isolated such as ampicillin(100%), penicillin (100%), cloxacillin (56%), piperacillin (70% ), cefotaxime (30% ), minocycline (60%), chloramphenicol (95%), erythromycin (39%), kanamycin (17%), gentamicin (70%), amikasin (30%), colistin (78%), and nalidixic acid (5%), respectively, but resistant to 9 kinds of antibiotics such as sulpenicillin, cefazolin, cephalothin, cefametazol, cefoperazone, kitasamycin, oleandomycin, lincomycin and bacitracin. 5. Pathological features of 60 cases of swine lungs indicated that pneumonic lesions were observed in 38 cases (63.3%) examined by macroscopic finding, in which lesions of 8 cases(13.4%) would correspond to those of mycoplasmal infection, and 30 cases (50%) were similar to viral infection by histopathological finding, whereas 22 cases (36.7% ) were considered to be normal by necropsy or histopathologlcal finding.