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구양모 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.1
During sintering of Al-4w/oCu powder compact with 20% porosity at 600℃, a liquid eutectic alloy (Al-33.2w/oCu) of copper and aluminum formed, penetrated between alumimum particles, and was dispersed aluminum flakes on the skin of aluminum particles. And then copper atoms of eutectic alloy diffused aluminum to from solid solution of aluminum and formed dispersed CuAl₂O ₄to react to diffused oxygen atoms from aluminum flakes. This dispersed CuAl₂O ₄strengthened bonding of aluminum particles.
니켈함량과 소결시간이 알루미늄 소결체의 압환강 도외 인장강도에 미치는 영향
具良謨 嶺南大學校 工業技術硏究所 1981 연구보고 Vol.9 No.2
The effects of Ni content and sintering time on tensile strength, elongation and radial crushing strength of Al-4Cu-xNi compacts were investigated. As nickel content of Al-4Cu-xNi compacts sintered at 600℃ and for 30 minites increased, the tensile strength, elongation and radial crushing strength of these compacts increased. It was believed that sintering was activated to form AlN₃i ₂with exothermic reaction which seemed to quicken the formation of CuAl₂O ₄spinel from submicron size of Al₂O ₃on flakes the skin of aluminum particles. This CuAl₂O ₄formation seemed to strengthen the bonding between aluminum particles. Optinal sitering condition was sintered at 600℃ and for 30 minites and nickel content was 2%.
유전 및 육종 : 단형질 개체모형을 이용한 한우 육종가 추정프로그램 개발
구양모 ( Yang Mo Koo ),김정일 ( Jung Il Kim ),송치은 ( Chi Eun Song ),이기환 ( Ki Hwan Lee ),신재영 ( Jae Young Shin ),장현기 ( Hyun Gi Jang ),최태정 ( Tae Jeong Choi ),김시동 ( Di Dong Kim ),박병호 ( Byoung Ho Park ),조광현 ( Kwa 한국동물자원과학회(구 한국축산학회) 2013 한국축산학회지 Vol.55 No.5
Estimate breeding value can be used as single trait animal model was developed directly using the Fortran language program. The program is based on data computed by using the indirect method repeatedly. The program develops a common algorithm and imprves efficiency. Algorithm efficiency was compared between the two programs. Estimated using the solution is easy to farm and brand the service, pedigree data base was associated with the development of an improved system. The existing program that uses the single trait animal model and the comparative analysis of efficiency is weak because the estimation of the solution and the conventional algorithm programmed through regular formulation involve many repetition; therefore, the newly developed algorithm was conducted to improve speed by reducing the repetition. Single trait animal model was used to analyze Gauss-Seidel iteration method, and the aforesaid two algorithms were compared thorough the mixed model equation which is used the most commonly in estimating the current breeding value by applying the procedures such as the preparation of information necessary for modelling, removal of duplicative data, verifying the parent information of based population in the pedigree data, and assigning sequential numbers, etc. The existing conventional algorithm is the method for reading and recording the data by utilizing the successive repetitive sentences, while new algorithm is the method for directly generating the left hand side for estimation based on effect. Two programs were developed to ensure the accurate evaluation. BLUPF90 and MTDFREML were compared using the estimated solution. In relation to the pearson and spearman correlation, the estimated breeding value correlation coefficients were highest among all traits over 99.5%. Depending on the breeding value of the high correlation in Model Ⅰ and Model Ⅱ, accurate evaluation can be found. The number of iteration to convergence was 2,568 in Model Ⅰ and 1,038 in Model Ⅱ. The speed of solving was 256.008 seconds in Model Ⅰ and 235.729 seconds in Model Ⅱ. Model Ⅱ had a speed of approximately 10% more than Model Ⅰ. Therefore, it is considered to be much more effective to analyze large data through the improved algorithm than the existing method. If the corresponding program is systemized and utilized for the consulting of farm and industrial services, it would make contribution to the early selection of individual, shorten the generation, and cultivation of superior groups, and help develop the Hanwoo industry further through the improvement of breeding value based enhancement, ultimately paving the way for the country to evolve into an advanced livestock country.
유전 및 육종 : 한우 도체형질의 유전능력평가를 위한 통계모형 탐색
구양모 ( Yang Mo Koo ),김시동 ( Si Dong Kim ),김정일 ( Jung Il Kim ),송치은 ( Chi Eun Song ),이기환 ( Ki Hwam Lee ),정용호 ( Yeoung Ho Jeoung ),이재윤 ( Jae Youn Lee ),장현기 ( Hyun Gi Jang ),박병호 ( Byoung Ho Park ),최태정 ( Te 한국동물자원과학회(구 한국축산학회) 2011 한국축산학회지 Vol.53 No.4
2006년부터 2009년까지 축산물품질평가원에서 등급 판정된 도체성적이 있는 개체와 한국종축개량협회에 등록이 확인된 231,382두의 자료를 이용하여 각 도체형질의 자료구조 분석 등을 살펴보고, 각 요인별로 도체형질에 어떠한 영향을 주는 지에 대한 환경효과 등을 분석하고, 변수선택법 등을 이용하여 향후 유전능력평가에서 사용 가능한 통계모형 찾아내고자 실시하였다. 한우 암, 수, 거세를 포함한 전체집단에서 출하체중, 도체율, 등지방두께, 근내지방도에서 정규분포를 보이고 있었고, 다른 형질은 정규분포에 근접함을 확인할 수 있었다. 각 요인에 대한 분산분석에서는 한우 도체형질에 대하여 성별, 출생년도-계절, 도축년도-계절, 출생지역, 도축일령의 모두 고도의 유의성(p<0.01)이 인정되었다. 변수선택법을 이용한 모형적합도 검정에서는 출하체중, 도체중, 도체율, 배최장근단면적은 다섯 가지 환경효과를 선택하는 것이 최적이었고, 등지방두께와 근내지방도는 네 가지 환경효과를 고려하는 것이 최적이었지만, 다형질 분석으로 한 번에 분석을 하기 위해서는 다섯 가지 환경효과를 함께 고려하는 것이 적합하다고 사료된다. This study was conducted to study the environment effects on live weight, carcass weight, dressing percentage, eye muscle area, backfat thickness, and marbling score, which are the carcass traits of Hanwoo, based on the estimates and all the possible regression for the selection of variable and significance test for 231,382 heads that underwent the carcass measurements. The average and standard deviation for the live weight, carcass weight, dressing percentage, eye muscle area, backfat thickness, and marbling score were 654.79±91.61kg, 362.30±67.15kg, 59.52±0.03%, 81.79±12.21cm², 11.39±5.40mm, 4.38±2.29, respectively. The live weight, carcass weight, dressing percentage, eye muscle area, backfat thickness, and marbling score for cow were 532.79±78.38kg, 313.40±44.90kg, 56.50±0.03%, 75.24±10.69cm², 11.82±5.10mm, 4.30±2.06, respectively, while for bull were 619.74±93.27kg, 376.89±48.62kg, 58.61±0.02%, 85.61±10.46cm², 5.64±2.71mm, 1.41±0.83, respectively, and for steer were 681.78±70.72kg, 415.23±49.43kg, 60.19±0.02%, 88.29±10.27cm², 12.71±5.23mm, 5.42±1.99, respectively. In the environmental variables selection based on the variables selection method, the examination by carcass traits suggested that the most appropriate model could be determined when five variables were selected for the live weight, carcass weight, dressing percentage, eye muscle area, and four variables for backfat thickness, and marbling score. When they were considered at a time altogether based on multiple traits, it was deemed to be desirable to insert all five variables into the variables for analysis. In addition, high significance was found by carcass traits.
구홍모 ( Hong Mo Koo ),구인모 ( In Mo Ku ),고영채 ( Young Chae Ko ),이희 ( Hei Lee ),양기원 ( Gi Won Yang ),이영일 ( Young Il Lee ),조태일 ( Tae Il Cho ),강유미 ( You Mee Kang ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.9
To our knowledge, implantation into the uterine muscle wall is one of the rare form of ectopic pregnancy, with only 16 cases reported until 1995. The early diagnosis depends upon the sonographic finding of intramural gestational sac-like growth and persis
구양모,이성학,Golkovskii, M,서동우,정병일 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8
The present study is concerned with microstructural analyses of the surface layer of a high speed steel (HSS) roll modified by irradiation of accelerated electron beam. HSS roll specimens were irradiated using an electron accelerator, and the microstructures of the irradiated surface layers were examined. Upon irradiation, the irradiated surface layer was melted because of the large heat input, resulting in microstructural change from coarse cell structure of primary carbides to a mixture of fine carbide cell and retained austenite. This microstructural modification might improve fracture or fatigue properties of the irradiated surface layer, although its hardness was decreased and quench cracks were found occasionally in the heat affected region. In order to solve the problems for applying the accelerated electron beam technique to HSS rolls, appropriate processing methods such as pre-or post-irradiation were suggested.
양창현,윤덕구,박정모,손수호,이준호,김윤년 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.3
Tsutsugamushi disease is acute febrile illness primarily affecting farmer and prevalent in Autumn. The disease is characterized by fever, rash and eschar and sometimes it caused atypical pneumonitis and it should be differentiated by Leptospirosis and Korean hemorrhagic fever. We experienced 38 cases of Tsutsugamushi disease diagnosed by clinical and detection of tsutsugamushi antibody by indirect immunofluorescent technique. Studied subjects were 15 cases of male and 23 cases of female and the victim were primarily farmer(89%). Most cases were occurred in October and September and in 1990. Fever and chills(94%)were the most complaint symptoms and other complaint symptoms were myalgia cough and dyspnea in the order of frequency. Leuhocytosis or leukopenia was detected in 14% and 11% respectively and 83% were detected to have thrombocytopenia. Transaminase was elevated in 57% and BUN and creatinine was elevated in 3%. Physical examination showed eschar(84%), rash(82%) hypatosplenomegaly(24%),conjunctival injection and hyperemia of pharynx. chest X-ray showed interstitial pneumonitis (11%) pulmonary edema(11%) and cardiomegaly(8%). 57% were revealed positive reaction to indirect fluorescent antibody technique. Clinical response was very good in the treatment of tetracycline vibramycin, or chloramphenicol.
Reynolds and froude number effect on the flow past an interface-piercing circular cylinder
Koo, Bonguk,Yang, Jianming,Yeon, Seong Mo,Stern, Frederick The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.3
The two-phase turbulent flow past an interface-piercing circular cylinder is studied using a high-fidelity orthogonal curvilinear grid solver with a Lagrangian dynamic subgrid-scale model for large-eddy simulation and a coupled level set and volume of fluid method for air-water interface tracking. The simulations cover the sub-critical and critical and post critical regimes of the Reynolds and sub and super-critical Froude numbers in order to investigate the effect of both dimensionless parameters on the flow. Significant changes in flow features near the air-water interface were observed as the Reynolds number was increased from the sub-critical to the critical regime. The interface makes the separation point near the interface much delayed for all Reynolds numbers. The separation region at intermediate depths is remarkably reduced for the critical Reynolds number regime. The deep flow resembles the single-phase turbulent flow past a circular cylinder, but includes the effect of the free-surface and the limited span length for sub-critical Reynolds numbers. At different Froude numbers, the air-water interface exhibits significantly changed structures, including breaking bow waves with splashes and bubbles at high Froude numbers. Instantaneous and mean flow features such as interface structures, vortex shedding, Reynolds stresses, and vorticity transport are also analyzed. The results are compared with reference experimental data available in the literature. The deep flow is also compared with the single-phase turbulent flow past a circular cylinder in the similar ranges of Reynolds numbers. Discussion is provided concerning the limitations of the current simulations and available experimental data along with future research.