200 GeV/핵자 유황이온과 핵건판핵의 충돌에 의해 생성된 헬륨 파쇄핵의 극한파쇄 연구

김동철,송진섭,윤천실,정성헌,박인곤,김종오,김철수,김태연,이승희,조재희,천병구,김재률,김준원,김태익,박명렬,장한일,임인택 慶尙大學校 기초과학연구소 1992 基礎科學硏究所報 Vol.8 No.-

고에너지 중이온 원자핵과 핵건판의 충돌에서, 200GeV/핵자 유황이온에 의해 생성된 파쇄 헬륨핵(Z=2)의 실험실계의 방출각 분포는 표적핵에 무관한 회귀공식. dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)]로 잘 표현된다. 여기에서 의사신속도 η=-ln[tan(θ/2)]이고, y_b는 실험실계의 입사입자(^32S)의 신속도이다. 이 공식에 의한 적합에서 k=-0.057±0.008로 얻어진다. 즉, 핵건판과 고에너지 중이온의 충돌에서 파쇄 헬륨핵의 exp(η-y_b)의 분포는 "극한파쇄" 현상을 잘 설명하고 있다. The angular distribution of emission angle θ of helium (Z=2) produced in the collisions of incident particles of 200 GeV/nucleon ^32S in nuclear emulsion is well expressed by dN=exp[a+k exp(η-y_b)]d[exp(η-y_b)] where the pseudorapidity is η=-ln[tan(θ/2)], the laboratory system primary rapidity is y_b, and k=-0.057+0.008. The shape of this frequency of occurrence distributions in terms of exp(η-y_b) attests to the validity of the concept of "limiting fragmentation" for helium projectile fragments produced in the projectile fragmentation regions of heavy ion collisions in nuclear emulsion.

남은 음식물 사료가 육성 비육돈의 성장과 도체특성에 미치는 영향

정일병,김동훈,문홍길,배인휴,남병섭,김영화,허상만,양철주 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.3

This study was conducted to investigate the effect of feeding RFW (recycled food waste) on performance in growing-finishing pigs. Four treatments with 3 RFW levels were tried in this study; 0% PT (pellet containing 0% RFW), 30% MT (mash containing 30% RFW), 30% PT (pellet containing 30% RFW) and 50% PT (pellet containing 50% RFW). For feeding trials, 60 heads of cross-bred barrows (Duroc x Landrace: average live weight 30 ㎏) were employed to 4 treatments with s replicates of 3 pigs each. For metabolic trials, 12 cross-bred barrows (average live weight 68 ㎏) were used with 3 replicates. The results obtained are as followings; ADG of 50% PT was significantly (P $lt; 0.05) lower than 0% PT and 30% PT, but 30% MT and 30% PT were not significantly different from 0% PT. In F/G ratio, 2.97 of 30% PT was not (P $gt; 0.05) significantly different from 2.85 of 0% PT treatment. Dressing percentage and back fat thickness were not significantly different among treatment. Addition of RFW increased appearance rate of carcass grade A or B. Nutrient digestibility was decreased by increasing RFW levels. The 30% PT was not significantly different from 0% PT in both DE and digestibility of crude fat and crude fiber, but significantly less in digestibility of crude protein and crude ash (P $lt; 0.05). Economic analysis based on feed cost per weight gain showed that pelleting feed with food waste 30% was the most economical.

우수 포유동물 수정란의 이용효율 제고에 관한 연구 : Ⅲ. 미세조작에 의한 수정란의 이용효율 증진에 관한 연구 Ⅲ. Study of Elevating Utilization Dfficiency of Embryos by Micromanipulation

정길생,김정익,김종배,정병현,이훈택,정형민 건국대학교 동물자원연구센터 2001 動物資源硏究誌 Vol.17 No.-

These experiments were carried out to apply the embryo manipulation technique, embryo bisection and blastomere separation, to animal industry. Bovine embryos were prepared through the in vitro maturation, fertilization, and development of follicular oocytes obtained from ovaries of slaughtered cow. The results obtained were summarized as follows: 1) Total 385 demi-embryos were produced from embryos by bisection and 90.4% of them were morphologically normal. 2) The viabilities of demi-embryos with or without zona pellucida in culture were 75.4~84.6% or 57.1~66.0%, respectively. 3) The developmental rates its demi-embryos of morulae or blastocysts were 77.6% and 68.2%, respectively. 4) After removing zona pellucida by pronase treatment, the rates of blastomere separation from 2-, 4-, and 8-cell stage embryos were 91.0, 75.8, and 63.2% respectively. After removing zona pellucida by micromanipulation, the rates of those were 81.5, 77.4, and 56.3%, respectively, showing the lower than those of pronase treatment. In addition, the better ratio were found in the ealier stage of embryos. 5) The developmental rate of blastomere to morula or blastocyst stage were 60.9~61.3% in 1/2 blastomeres, 57.1~59.3% in 1/4 blastomeres, and 41.7~50.7% in 2/8 blastomeres, showing the better rates in the earlier stage blastomeres. 6) After incubating 1/2, 1/4, and 2/8 blastomeres in ovine oviduct for 3~3.5 days, the recovery rates were 58.8, 58.5, and 29.6%, respectively, and the developmental rates to the morulae or blastocyst stage were 65.0, 58.3, and 37.5%, respectively.

Simulation of Rough Rice Drying by Natural Air(Ⅰ)

Chang, D. I.,Chung, D. S.,Pfost, H. B.,Calderwood, D. L. 충남대학교 농업과학연구소 1983 農業技術硏究報告 Vol.10 No.1

Simulation model of natural air grain drying was discussed and modified to predict the changes of grain moisture content and dry matter loss of rough rice drying. The modified simulation model was then validated using actual test data. A series of simulated drying tests using official weather data for 15 years from Beaumont, Texas, was taken to make minimum airflow rate and maximum bed depth of rough rice drying by natural air, under different conditions of initial moisture content of rough rice, airflow rate and harvest date.

축류터빈 블레이드의 공력학적 설계를 위한 Navier-Stokes방정식의 적용

정희택(H.T. Chung),정기섭(K.S. Chung),박준영(J.Y. Park),백제현(J.H. Baek),장범익(B.I. Chang),조수용(S.Y. Cho) 한국전산유체공학회 2003 한국전산유체공학회지 Vol.8 No.4

The design method for transonic turbine blades has been developed based on Navier-Stokes equations. The present computing process is done on the four separate steps, I. e., determination of the blade profile, generation of the computational grids, cascade flow simulation and analysis of the computed results in the sense of the aerodynamic performance. The blade shapes are designed using the cubic polynomials under the control of the design parameters. Numerical methods for the flow equations are based on Van-Leer’s FVS with an upwind TVD scheme on the finite volume. In the present study, numerical simulation has been done to investigate the effects of the design parameters on the aerodynamic performance of the axial-flow turbine blades Applications are made to the VKI transonic rotor blades. Computed results are analyzed with respect to four parameters and compared with the experimental data.

실험 무창육계사의 환경효율 분석

황보종,송준익,조성백,정광화,이병석,남병섭,정찬성,정일병 한국동물자원과학회 2002 한국축산학회지 Vol.44 No.4

본 연구는 무창계사에 대한 효율 비교분석 연구가 전무한 실정으로 무창계사의 환경효율을 검증하고자 하였다. 본 실험은 축산기술연구소 신축 실험계사에서 2002년 5월 9일에서 5월 30일 사이에 실시하였으며 실험결과는 다음과 같다. 1. 무창계사는 외부의 기온은 9.6∼21.2℃로 편차는 약 11.6℃를 나타내었는데 비하여 단열이 우수한 무창계사에서는 병아리 사육적온기인 32∼33℃ 범위를 유지하여 약간의 보조열원으로 낮과 밤의 편차는 2℃ 이상 나타나지 않아 온도효율이 높았다. 2. 공기풍속에 있어서는 무창계사는 상부 0.57 m/sec, 중앙 0.22 m/sec, 하부 0.04 m/sec로 각각 나타나, 계사내 적정 풍속유지를 위한 덕트입기구의 천공으로 인하여 계사내 전체공간에서 공기의 유속흐름 분포가 고르게 나타났다. 이상의 실험결과를 종합해 볼 때 조사대상이된 무창계사의 온도 및 습도 환경이 우수하게 나타났으며, 특히 공기속도는 계사 공간 내에서 아주 고른 분포를 가져와 측벽 덕트 입기시설과 측벽 배기시스템이 우수하였다. The experiment was conducted to evaluate a ventilation system, which was devised to encourage farmers to use the enclosed poultry housing system. The study was observed in the National Livestock Research Institute from May 9 to May 30 in 2002. The main results of the experiment are as follows : 1. Although the outside temperature of the enclosed poultry house was 9.6∼21.2℃ with 11.6℃ variation, the house with an excellent heat insulation was maintained at 32∼33℃ in a variation of 2℃ which is within the range of the optimal temperature for broiler, being aided with two small electric heaters. 2. The average of air flow rates of the upper, middle and low parts of the room in the broiler house were detected at 0.57, 0.22 and 0.04 m/sec, respectively. The air flow in the whole room was distributed uniformly by a perforated duct. In conclusion, heat and humidity could be controlled without any problem in this enclosed housing system. Especially, air flow in all parts of the room was detected in uniform rates, resulting in the better ventilation performance with air inhalation through the duct and air exhaust through the side walls of the house.

염색체의 배수성 증가에 의한 닭의 신품종 개발 1 . 다배수성 배아의 생산

여정수(J . S . Yeo),정선부(S . B . Chung),오봉국(B . K . Ohh),정일정(I . C . Cheong) 한국축산학회 1989 한국축산학회지 Vol.31 No.5

Tri-ethylene melamine (0.25-0.3㎎/2㎏ body wt.) which inhibits partially gametogenesis to produce the polyploid embryos was injected 4 hours before ovulation to dual purpose chicken with 24 hours egg cycle. After artificial insemination 78-83% of fertilization rate and 44% of triploid embryos of fertilized eggs were observed. Times of meiosis I and Q during oogenesis detected by the sex chromosomes of triploid embryos seemed to be at 2-4 hours before ovulation and duration meiosis Ⅱ was shorter and more irregular than that of meiosis I.

한우의 이상염색체 분포에 관한 연구

여정수(J . S . Yeo),정일정(I . C . Cheong),정경진(K . J . Chung),정선부(S . B . Chung),정연후(Y . H . Jung),이기복(K . B . Lee),설동섭(D . S . Sul),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.9

Through chromosomal analysis of 109 heads of the Korean Native Cattles, this research was observed results as follows; 1. Six heads(5.5%) were cosisted of two kinds of mosaic chromosomal spreads( I : monosomy, normal and trisomy II: monosony and normal) and these mosaicsms were variated at #29 chromosome. 2. One head was showed supernumery chromosome suggested B-chromosome. 3. 1/29 Robertsonian translocation was not found in the Korean Native Cattles.

육돈생산을 위한 우량교배조합 선발시험

박창식,정선부,김희석,이근상,박영일 ( C . S . Park,S . B . Chung,H . S . Kim,K . S . Lee,Y . I . Park ) 한국축산학회 1980 한국축산학회지 Vol.22 No.3

The results of a crossbreeding experiment with a total of 315 pigs of Berkshires, Hampshires, Durocs, Landraces, Large Whites, seven different twobreed crosses and twelve different three-breed crosses, produced at Livestock Experiment Station from 1975 through 1979, are summarized as follows. 1. The three-breed cross from D♂×(H♂×L♀) F₁♀ mating had the highest average daily gain and lowest feed requirement per unit gain, followed by the D♂×(Lw♂×L♀) F₁and H♂×(Lw♂×L♀) F₁♀ matings. The Berkshires and Landraces ranked lowest among the 24 mating groups compared for both of the traits. Males had higher average daily gain than females by about 0.06㎏ and had lower feed requirement by about 0.14. 2 . The three-breed crosses from D♂×(H♂×L♀) F₁♀, D♂×(Lw♂×L♀) F₁♀ and H♂×(Lw♂×L♀) F₁♀ matings reached 90㎏ body weight at younger age than the other groups. The D♂×(H♂×L♀) F₁♀ group reached 90㎏ at younger age than the Landrace by 39 days. The effects of the mating group, year, season and sex were statistically significant for the average daily gain, feed requirement and age at 90㎏ body weight. 3. The dressing percentage and lean meat percentage tended to be higher in H♂×(Lw♂×L♀) F₁♀, H♂×L♀ and H♂×B♀ matings compared to the other mating groups. The effects of the mating group and season were statistically significant, but the effects of the year and sex were not significant. 4. The loin-eye area was largest in the Kw♂×L♀ mating and smallest in the B♂×L♀ mating. Males had higher dressing percentage, higher lean meat percentage and loin-eye area than females. 5. The backfat was thinnest in purebred Hampshire and was thickest in B♂×L♀mating. The effects of the mating group and year were significant, but the effects of the season and sex were not significant. 6. The results obtained in the study suggest that the three-breed crosses from D♂×(H♂×L♀) F₁♀, D♂×(Lw♂×L♀) F₁♀ and H♂×(Lw♂×L♀) F₁♀ matings are superior crossbreds for pork production.

CIE L 기준에 의한 PSE 육과 정상육의 육질 및 도체특성에 관한 연구

정일병,이무하,김태헌,이영창,김동훈,김일석,채현석,김웅배 한국축산학회 1998 한국축산학회지 Vol.40 No.6

Two hundreds and twenty two pork carcasses from a commercial breed were investigated for meat quality and carcass traits of PSE and normal pork classified by CIE L value. pH and conductances were taken on 1(pH₁, C₁), 3(pH₃, C₃), 6(pH_6, C_6) and 24 hr postmortem(pHu, C_u). Significant differences between PSE and normal pork were observed in pH₁, pH_u (p $lt; 0.001) and pH₃(p $lt; 0.05). But, no significant difference was found in pH_6. Although, there was no significant difference in C₁, significant differences are found in C₃(p $lt; 0.05), C_6 (p $lt; 0.01) and C_u(p$lt;0.001). The water holding capacity(WHC) were significantly lower(p$lt;0.01) in the PSE compared to the normal pork. The cooking loss were significantly higher(p $lt; 0.05) in the PSE compared to the normal pork. The CIE L value was highly related with NPPC color scale(R²=0.77), moderately related with pH_u (R²=0.45), C_u(R²=0.57), WHC(R²=0.49), cooking loss(R²=0.45) and juiciness(R²=0.43), and poorly related with pH₃(R²=0.27), pH_6(R²=0.27) and conductances(R²=0.05-0.15). Consequently, the results suggest that pork quality classification by CIE L value expresses obvious differences in most of important pork quality parameters like pH₁, pH_u, C_u visual color and WHC.