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고속액체 크로마토 그래피에 의한 유제품 중의 당류정량 ( 糖類定量 ) 1 . 시판 발효유 음료의 유리당정량 ( 遊離糖定量 )
이용규,송명희,전순배 ( Y . K . Lee,M . H . Song,S . B . Chun ) 한국축산학회 1982 한국축산학회지 Vol.24 No.4
This experiment was conducted to investigate the distributions of free sugars in commercial liquid yogurts as well as the changes of their sugar contents during the storage at different temperatures by HPLC. The results obtained were as follows: 1. The optimal operating conditions of HPLC for the detection of free, sugars in sample were as follows: mobile phase, acetonitrile + water = 78+22 (v/v); flow rate, 2㎖/min.; the chart speed of recorder, 0.25 ㎝/minute. Under the above conditions, fructose, glucose, sucrose and lactose were not only seperated at base line within 16 minutes but also quantitated by peak height. 2. The extraction of sugars is sample by ethanol was much better than that of acetonitrile. 3. Fructose, glucose, sucrose and lactose were isolated from all products examined (A.B.C.D); among these, sucrose was largest in quantity, and the others wore is order of glucose, fructose and lactose respectively. 4. The changes in sugar content after 7 days` storage at different temperatures showed that glucose, fructose and sucrose were all decreased while lactose was almost unchanged.
이용규(Y G Lee),김만식(M Kim),한성주(S J Han),민경덕(K Min),김응서(E S kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
3D computation was performed to predict the knock onset angle and autoignition location in a commercial 3-valve pent-roof type spark ignition engine. Weller's combustion model and reduced chemical mechanism of hydrocarbon fuels in the low temperature which was proposed by Keck and Hu were combined to simulate the flame propagation and autoignition of unburned gas. In order to verify the numerical results by experiments, pressure transducer and 11 ion probes were installed in the cylinder head. Autoignition location could be determined from the knock onset angle determined by cylinder pressure and flame arrival time determined by ion probes. The pressure traces and flame arrival time of numerical results were compared with the experiments. The numerical results were in good agreements with the experiments. Therefore knock onset time and its location could be predicted.<br/>
COMPUTATIONAL AND EXPERIMENTAL STUDIES OF GTL SPRAY AND COMBUSTION
K.S. Kim(김기성),U.B. AZIMOV,D.S.JEONG(정동수),Y.LEE(이용규) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes the work performed on GTL(Gas to Liquid) spray and combustion in the environments similar to diesel engine combustion. We have used STAR-CD code developed by CD-adapco Group for simulating diesel spray and combustion phenomena. Computations of spray, temperature, NOx and soot emissions distribution were performed. For comparison, we performed the visual investigation of the sprays and flames in a simulating vessel of diesel combustion. For this work, we constructed a rapid charging combustion vessel (RCCV) where high pressure and hot air is rapidly charged to simulate the environment of a diesel engine combustion chamber. As a fuel, we used GTL (Gas to Liquid) which is synthesized from natural gas and has the potential of less soot emission and SOx.
박순용,윤정의,이용규 ( S . Y . Park,J . E . Youn,Y . K . Lee ) 한국축산학회 1973 한국축산학회지 Vol.15 No.3
To study the smoking process of chicken meat, various experiments were performed. The results about reduction of meat weight, curing, boiling, smoking condition in the course of processing are Summarized as follows. 1. Broiler was more desirable as material of smoked chicken than culled chicken. The broiler of 1,300g in living body weight was considered to be the most suitable. 2. The yielding ratio of product was 58.9∼60.3% in broiler and 51.6% in cull chicken, respectively. 3. The water and salt contents of meat were increased as the pickling period elapsed. Salt and sucrose among the contents of pickling solution decreased respectively by 4.8% and 0.35%, while total nitrogen increased by 0.2%. 4. The boiling time was satisfied with 30 minutes at temperature of 67℃ & 60 minutes for drying process. 5. At smoking moisture reduction quantity was increased in proportion to smoking time & smoking temperature. The most idealtype was 2 hour at 40℃.
허정원,김정호,백영진,정기철,이용규 ( J . W . Huh,J . H . Kim,Y . J . Baek,K . C . Chung,Y . K . Lee ) 한국축산학회 1990 한국축산학회지 Vol.32 No.5
This reseach was performed to estabilish gene marker and elucidate lactose utilization system of Lactobacillus casei YIT 9018. Lactose negative mutants(lac) were isolated by curing agent such as acriflavin(20 ㎍/ml), acridine orange(80 ㎍/ml), ethidium bromide(10 ㎍/ml) and elevated temperature(42℃). Frequencies of lac mutants of L. casei YIT 9018 on these curing agents were 3.03, 1.41, 3.22 and 0.35%, respectively. The lactose negative mutants isolated had no ability of lactose utilization. L. casei YIT 9018 was found to have one plasmid of approxymately 45 Mdal, which was lost readily by curing agent and its ability to utilize lactose was lost silmultaneously.
이재순(J. S. Lee),임성식(S. S. Lim),이용규(Y. K. Lee) 한국자동차공학회 1989 오토저널 Vol.11 No.6
Engine analyzer is developed with the aids of personal computer, A/D converter, interfacing signal transducer and data processing computer programs.<br/> The objective of this development are that it should firstly be produced at the resonable low price compared with imported one taking advantage of using existing personal computer and printer, and it should also give good quality of performance. For the attainment of this objective, A/D converter should have been developed to meet the price limit of the equipment.<br/> The experiment is performed in a 4 cycle 4 cylinder gasoline engine by this analyzer, and all the information which are necessary for the combustion analysis can be obtained through the processing of the pressure data that are stored in the computer. These are pressure-volume curve, pressure-crank angle curve, the rate of pressure rise and heat release versus crank angle curve etc.<br/> With this developed experimental system of resonable price, it will be considered that more easy way of engine data pick-up and processing is possible.