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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.
정우창,민동준,정원섭,정원배,정현철 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
In a smelting reduction method, the fluidized bed reactor is one of the most possible reactors for prereduction of fine iron ore. In this work, the reduction degree of fine iron ore(106∼212, 212∼250㎛) were measured from hematite to iron CO 100% gas in a batch-type fluidized bed. The rate parameters incluiding the present study were determined by using the reduction data. The reduction rate of fine iron ore increased with increasing temperature and gas flow rate, whereas that was decreased with increasing ore diameter and ore inventory. The apparent activation energy for the reaction is measured to be about 59-75 kJ/㏖. The fundamental data for the development of pre-reduction furnace by fluidized bed and direct iron-making process could be acquainted from this study.
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.
이계완,조정완,김길무 대한금속재료학회(대한금속학회) 1972 대한금속·재료학회지 Vol.10 No.1
CO·CO₂가스 분위기하에서의 Fe-W 용융체에 대한 슬래그-용강간의 반응을 1,650℃ 및 1,750℃에서 검토하였다. Pco/Pco₂=5.0 이상에서 텅스텐의 슬래그-용강간의 분포, [W]/(WO₃)는 다음 반응평형에 따라 결정된다. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 슬래그-용강간의 반응에 대한 평형항수, K_f는 1,650℃의 경우 Pco/Pco₂=3.3이하에서 점차로 감소하고, 1,750℃의 경우는 Pco/Pco₂=5.0 이하에서 급격히 감소한다. 슬래그상중의 (FeO)함량은 Pco/Pco₂가 감소함에 따라 다음 반응에 의하여 증가한다. [Fe]+CO₂=(FeO)+CO 공기중에서 용해할 때 슬래그-용강간의 반응을 다음과 같이 추정하였다. (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31 Slag-metal reactions for iron-tungsten melts under CO·CO₂ gas atmosphere are investigated at 1,650℃ and 1,750℃. When Pco/Pco₂ is more than 5.0, slag-metal distributions of tungsten, [W]/(WO₃), can be determined by the following reaction equilibriclm. (WO₃)+3[Fe]=[W]+3(FeO) log K_f=-22,300/T+10.66 The equilibrium constant, K_f, for the slag-metal reaction slightly decreases when Pco/Pco₂ is less than 3.3 at 1,650℃, and suddenly decreases below Pco/Pco₂=5.0 at 1,750℃. (FeO) contents of slag phase increase, as Pco/Pco₂ decrease according to the following reaction, [Fe]+CO₂=(FeO)+CO, An estimation for slag-metal reactions on open melting is as follows; (WO₃)+2.5[Fe]=[W]+2.5(FeO_(1.2)) log K_i=-14,288/T+6.31
암에르고미터 운동시 여유심박수에서의 신체작업능력(PWC%HRR)을 이용한 최대산소섭취량 추정에 관한 연구
정성태,전태원,정덕조,정영수,엄우섭,이동기,윤호섭 한국운동과학회 2000 운동과학 Vol.9 No.1
암에르고미터 운동시 여유심박수에서의 신체작업능력(PWC%HRR)을 이용한 최대산소섭취량 측정에 관한 연구 운동과학. 제 9권 제 1호. (1)-(12), 2000. 본 연구의 목적은 암에르고미터 운동시 여유심박수에서의 신체작업능력(PWC%HRR)을 이용해 최대산소섭취량(O₂_(max))을 추정하는데 있어 그 타당성을 보는데 있다. 이를 위해 본 연구에서는 건강한20대 남자 대학생(21.1±2.77)20명이 참가 하였다. 이들의 안정시 심박수는 5분간 EKG로 측정되었고, 최대산소취량은 암에르고미터에서 50rpm의 속도로 20W에서 운동을 실시하고 매 3분 간격으로 10W씩 증가시켜 피험자가 탈진시까지 운동을 지속시켰다. 여유심박수 계산에 있어서 최대심박수는 수식(HRmax = 210 - age)으로 계산되었다. PWC%HRR의 계산은 점증부하 운동상에서 120≤R≥160의 범위에 발견된 HR과 O₂의 관계식(Y=bx+a)에 의하였다. 강도별 상대적 백분율 범위는 50∼85%사이였으며, 비교대상은 PWC%HRR, O₂R, O₂_(max)이었다. 그 결과 다음과 같은 결과를 얻었다 첫째, %HRR과 O₂R, O₂_(max)간의 회귀분석결과 %HRR은 O₂_(max)보다 O₂R에 가까웠다. 둘째, 각 강도별 PWC%HRR과 O₂R, O₂_(max)간에는 통계적으로 유의한 차이는 없었으나, PWC%HRR은 O₂_(max)보다 O₂R에 보다 가까웠다(P<.05). 셋째, O₂_(max)의 실측치와 PWC%HRR = O₂R에 의한 추정치 사이에는 모든 강도에서 통계적으로 유의한 차이가 없었으나, 상관관계는 PWC%HRR에서 가장 높았다(P<.05). 이상의 결과를 종합해 볼 때 암에르고미터 운동검사 과정에서 만족할 만한 O₂_(max) 발견하지 못했더라도 최소한 60%HRR에 해당하는 심박수가 발견될 때까지 운동을 수행하였다면 일련의 방식에 의해 O₂_(max)의 추정이 가능하다고 본다. The study on Estimation of maximal oxygun uptake through PWC%HRR during Arm Ergometer Exercise. Exercise Science, 9(1): 1-12, 2000. The purpose of this study was to evaluate the validity for estimation of maximal oxygen uptake through PWC%HRR during Arm Ergometer Exercise. The subjects of this study were 20 healthy males(21.2±2.77yrs) college students. Resting heart rate of subjects were recorded by EKG for 5min. the maximal oxygen uptake was determined until subjects were exhausted. The first stage was performed 50rpm, 20W, and then was increased by 10W every 3 minutes on the arm ergometer. HRmax was determined by a numerical formula of HRmax = 210-age. PWC%HRR was assessed by relative equation (Y=bX+a) of HR and V˙O₂ observed in range 120≤R≥160 during the exercise test. Range of relative percentage was between 50% and 85%, comparison factor was examined among PWC%HRR, % V˙O₂R and % V˙O₂_(max). The results of this study are as follows : 1) Result of the regression analysis among PWC%HRR, % V˙O₂R and % V˙O₂_(max), %HRR was equivalent to % V˙O₂R rather than V˙O₂_(max). 2) No significant difference was observed among PWC%HRR, % V˙O₂R and V˙O₂_(max) in the all intensity, But the PWC%HRR was closer to % V˙O₂R rather than V˙O₂_(max)(P<.05). 3) No significant difference was the actual V˙O₂_(max) and the estimation value by PWC%HRR = % V˙O₂R in the all intensity, and the correlation analysis was the most correlated at the estimation value by PWC%60HRR. It was concluded that if the satisfactory V˙O₂_(max) was not found in Arm Ergometer exercise test but heart rate corresponded to 60%HRR, V˙O₂_(max) can be estimated by a series of equation.
( Won Seo Chung ),( Chul Um In ),( W. Rico Catherine ),( Young Kang Mi ) 한국잠사학회 2011 International Journal of Industrial Entomology Vol.23 No.1
The effect of dietary feeding of silk fibroin/sericinmixtureson the antioxidative status and glucose metabolism in high fat-fed mice was investigated. The mice weregiven experimental diets for 6 weeks: normal control (NC),high fat (HF) andhigh fat supplemented with F100 (pure fibroin, HF-F100), F81 (81:19 fibroin-sericin, w/w, HF-F81) or F50 (50:50 fibroin-sericin, w/w, HF-F50). The silk protein-fed mice showed decreased lipid peroxidation, enhancedantioxidant enzymesactivities and lower blood glucose level relative to HF group. The HF-F50 animals exhibited significantly lower insulin level, higher glycogen concentration, enhanced hepatic glucokinaseactivity and reduced glucose- 6-phosphate and phosphoenolpyruvatecarboxynaseactivities than the HF ones. The in vivo antioxidant activity and hypoglycemic action tended to increase with increased amount of sericin and decreased fibroin content in the diet. These findings demonstrate that silk protein, particularly sericin, may be beneficial in suppressing high fat diet-induced hyperglycemiaand oxidative stress.
확신도 기법을 적용한 선박엔진 고장진단 전문가시스템 구현에 관한 연구
정경열(K.Y.Chung),최욱현(W.H.Choi),임헌호(H.H.Lim),류길수(K.S.Rhyu) 한국해양대학교 해사산업연구소 1998 海事産業硏究所論文集 Vol.8 No.-
This paper presents the design and implementation of a diagnosis system incorporating with a monitoring system. We classified the ship engine into the sub parts as similarly a experts classification method, acquired the causal relation between measuring data and fault states in consultation with experts, constructed a rule-base using them, and adopted a certainty-factor method in order to handle uncertanties of evidences and rules. When alarms occur, the system infers diagnostic conclusion by using certainty factor obtained from an alarm state (one of 4 levels) and an alarm datum's trend (one of 3 levels), and the certainty factor of a related rule (one of 3 levels).