하이 포이드 기어 단조 공정 개발

최연호,박원규,김대원,최호준,윤덕재,이상목,임성주,이영선 한국소성가공학회 2010 단조 심포지엄 Vol.2010 No.6

난용종계 집단에서의 선발에 의한 유전모수 변화 양상

최연호,오봉국 한국가금학회 1990 韓國家禽學會誌 Vol.17 No.4

본 연구는 상업용 난용종계에서 선발에 의한 유전력과 유전상관계수등의 유전모수가 어떤 양상으로 변화하는지를 알아보기 위하여 수행되었다. 분석에 이용된 자료는 백색레그혼종 1계통(Line-W)과 갈색난용종 1계통(Line-B)에 대한 1980년부터 1985년까지의 6년간 5세대 동안의 선발결과에 대한 것으로 표현형 능력 변화와 근친교배의 영향력 분석 및 유전력과 유전상관계수의 추정에 의해 얻어진 결과를 요약하면 다음과 같다. 1. 두 계통의 표현형 능력 변화는 주 선발형질인 300일령 산란수와 400일령 산란수에서, Line-W의 경우는 4세대와 5세대에서 감소한 것으로 나타난 반면, Line-B에서는 희귀분석에 의해 각각 2.87개와 4.25개씩 증가한 것으로 나타났다. 초산일령은 두 계통에서 각각 세대당 1.61일과 4.44일씩 단축된 것으로 분석되었는데, Line-B에서 얻어진 수치는 고도의 유의성을 보였다. Line-W에서 나타난 산란수의 감소추세가 유전적개량의 한계에 의한 것인지의 여부는 대조구 집단에 의한 자료가 없는 한 확인하기가 어려웠다. 2. 폐쇄집단에서 이루어진 선발과정에서 필연적으로 나타날 근친교배의 영향력에 대해 알아보기 위하여 매세대 유효양친수에 의한 근교계수 상승도를 추정한 결과 각각 0.2%와 0.3%로 나타났고, 가계형성원을 조사하여 계산된 세대별 근교계수는 각각 0.8%이하로 나타나서 근친교배로 인한 능력의 저하현상이나 유전모수 추정의 오차는 무시해도 좋을 것으로 판단되었다. 3. 두 계통의 주요 형질에 대한 유전력은 대부분의 형질에서 모 분산에 의한 추정치가 부 분산이나 희귀분석에 의한 추정치에 비해서 높게 나타나, 이들 형질에 미치는 모체효과를 포함한 비상가적 유전변이의 존재를 암시해 주었다. 300일령 산란수와 산란율 등의 형질에 대한 유전력은 두 계통에서 세대 경과에 따라 감소되는 추세를 보였으나, 30주령 및 40주령시에 난중에 대한 유전력 추정치는 세대 경과에 따라 뚜렷한 감소 추세를 보이지 못했다. 또한, 주요 형질 사이의 유전상관계수도 세대 경과에 따라 일정한 방향으로 변화되지 않는 것으로 나타났는데, 이는 여러 형질이 동시에 선발되었고 또 각 형질에 대한 선발비중이 세대별로 일정하지 못했던데서 오는 형질간 유전자 작용의 복합성에 기인되는 것으로 생각되었다. This study was carried out to investigate the time-trends of genetic parameters of the dosed flock population which selected for improving egg production. Data for two layer pure lines, Line-W (Single Comb White Leghorn) and Line-B (brown layer) which have been maintained at the Mani Breeding Farm were collected from 1980 to 1985 during 5 generations. The effective number of parents per generation ranged from 148 to 366 in Line-W and 85 to 355 in Line-B, and the cumulative expected inbreeding coefficients during 5 generations of selection were 15% and 1.6%. So inbreeding could not be considered a critical factor on estimating the genetic parameters, heritabilities and genetic correlations Heritabilities of EN 300 and EN 400, primary two selected traits were significantly decreased during 5 generations but the estimates of the other 03its not showed the consistent decreasing pattern significantly. No time trends of probable consequence were evident in the genetic correlation coefficients of the traits studied. The reason for that situation was attributed to the fact that selection was conducted for multiple objectives and the relative importance of selection for the studied traits were not consistent by generations.

닭의 능력검정정보 통계분석시스템 개발

최연호,서강석,조상문 한국농업정보과학회 2000 농업정보과학 Vol.1 No.2

This study was carried out to develop RSTASystem (Random Sample Test Analyses System) and internet homepage for providing chick random sample test infermation to rhick breeders and farmers. RSTA-System is the applied statistical package sofhvare which can be used to analyse the random sample test data collected since 1985 by the chick random sample test station in Ansung. Microsoft Visual Basic(V6.0) was used for developing RSTASystem, and the system was composed of 4 main menus and 10 sub-menus. Random sam-ple test information acquisited by RSTASystem could be provided through the internet homepage (agis.nlri.go,kr/www.poultry.or.kr). Major contents are as fnllows : introduction and schedule of random sample tesL summary reports from 1910 to 1999 for tapers and broilers, full reports from 1990 to 1999 for layers and broilers, down-load of RSTASystem fnes and database file. Users could acquire random sample test data and relevant information easily and quitkly through this system, and the information would be applied for selecting chick strains and producing of making more profits.

양계농가 전산화 실태에 관한 조사 연구

최연호,이상진,신영수 한국가금학회 1996 韓國家禽學會誌 Vol.23 No.4

This research was carried out to get the basic information on the current situation of personal computer utilization for poultry farm management, and the results obtained could be used in developing of the software system for the poultry farm management. Survey method by interview and mail was adopted to carry out the research, and the total number of data used to statistical analyses was k6 poultry farmers. 1. The ratio of the poultry farmers who had the personal computer(P/C) was about 25%, and the most of the layer farmers from age 30 to 40 who manage the flock size 20,000 or above had the P/C. 2. About 70% of the farmers who had P/C have bought the system after 1993, and 83% of those farmers had the P/C-486 or above level system. They bought the P/C with intent to apply it to farm management(39%) and education for children(31%). 3. About 50% of the farmers who had P/C obtained the relevant knowledge for operating computer system by themselves, and the 33% of the P/C-possessed farmers used P/C for word-processor. 4. About 35% of the farmers who had P/C applied their system to analyse the management analyses, and the sarne ratio of the farmers answered that they didn't apply the system to their farm management. 5. About 25% of the farmers who had P/C used package software, and the company which installed the automated cage system offered the software. 6. Most of the farmers considered the computerization of the farm management positively, and they answered that they will apply P/C to their management actively from now on. 7. About 56% of the farmers didn't think that they had sufficient knowledge for operating computer system, and a quarter of them pointed that the difficulty of the buying software for poultry farm management was the most biggest problem to spread out the computerization in the poultry farm. 8. Most of the poultry farmers didn't buy P/C because they didn't have the relevant knowledge for computer system, but they wanted to learn basic knowledge for computer, and they had the intention to apply computer to their management positively. In order to expand the computerization for poultry farm management, appropriate education system for the farmers from age 30 to 40 who manage the flock size 20,000 or above and the development of the software that could be applied to poultry farm management on the spot efficiently should be made.

산란종계의 난중에 대한 유전적 모수추정에 관한 연구

최연호,오봉국 ( Y . H . Choi,B . K . Ohh ) 한국축산학회 1983 한국축산학회지 Vol.25 No.6

This study was carried out to present the informations for the optimum age of selection based on partial records to improve egg weight in layers. The data used in this study were the records on 787 White Leghorn hens from two different strains, A and K, which were raised at College of Agriculture, Seoul National University since 1976. The traits analysed in this study were mean egg weights in each period divided into 4 week intervals from first egg and annual mean egg weight in lines A and K. Heritability estimates for mean egg weight in each period from sire component and dam component were; different in appearance in two lines. In line A, the fact that heritability estimates from sire component was higher than those from dam component except for EW 22 suggested the importance of the sex-linkage effect on the inheritance of the traits studied. But the result of line K was shown to be reverse. The heritability estimate for EW 30 that is mean egg weight from 29 weeks to 32 weeks of age was higher than any other periods in line A. In the genetic correlation between. annual mean egg weight and mean egg weights in each period, the coefficient of EW 34 was 0.999 for line A and 0.900 for line K. The figures were highest among all genetic correlation coefficients. Results obtained above suggested that it might be possible to select hens at the period of 33-36 weeks of age to improve egg weight based on early part of the record.

88년 국내외 경제여건 및 국내 에너지 수급전망

최연호 대한전기협회 1988 대한전기협회지 Vol.- No.136

호주태권도장 지도자의 리더십과 도장만족, 재등록의도, 구전의도의 관계분석

최연호 한국발육발달학회 2020 한국발육발달학회지 Vol.28 No.2

The purpose of this study was to analyze the causal relationship between leadership, gym satisfaction, re-registration intention and word-of-mouth intention of Australian Taekwondo leaders. In order to achieve the purpose of the study, a survey was conducted from trainees who were currently practicing in Taekwondo gym in Australia, from January 31, 2019 to February 25, 2019. Convenience sampling method and self-assessment method of non-probability samples were used to conduct a research. the total number of questionnaires were 330 and 305 parts among them were statistically processed, excepting for 25 unreliable data because of their insufficiency or lack the answer of the survey. The ultimate research conclusions drawn by SEM(structural equation modeling) are as follows. First, leadership of the leaders affected positively on gym satisfaction and re-registration intention. Second, gym satisfaction showed a positive impact on reregistration intention and word of mouth intention. Third, re-registration intention had a positive effect on word of mouth intention. Unlike research hypothesis, however, the leadership of the leaders didn't show any significant influence to word of mouth intention.

소아 간이식에서 Posttansplant Lymphoproliferative Disorder (PTLD): 삼성서울병원의 경험

최연호,이석구,서정민,조재원,김성주,이광웅,박제훈,고영혜,권기영,Choe, Yon-Ho,Lee, Suk-Koo,Seo, Jeong-Meen,Joh, Jae-Won,Kim, Sung-Joo,Lee, Kwang-Woong,Park, Je-Hoon,Ko, Young-Hye,Kwon, Ki-Young 대한소아소화기영양학회 2003 Pediatric gastroenterology, hepatology & nutrition Vol.6 No.1

목 적: EBV의 초감염과 면역억제의 강도는 소아 간이식에서 PTLD 발생의 주요 위험인자로 알려져 있다. 삼성서울병원에서 6년간 경험한 PTLD 5례의 임상양상을 분석해보고자 한다. 대 상: 1996년부터 2002년 6월까지 41례의 소아간이식 환아를 대상으로 하였는데 이중 7명이 사망하였고, PTLD로 사망한 1명을 포함한 35명을 대상으로 분석하였다. 방 법: 공여자의 EBV 항체가 양성이고 수혜자가 음성일 경우 고위험군으로, 그 외의 경우를 저위험군으로 정의하였다. 위험군 분류, 면역억제제 종류, 간이식이 행하여진 나이, 수술 후 PTLD 진단까지의 기간, 수술 후 EBV 항체의 양전 시기, 거부반응에 대한 치료 여부, PTLD의 증상들인 발열, 설사, 빈혈, 장출혈 식욕부진 저알부민혈증 등의 발현 여부를 후향적으로 조사하였다. 결 과: 1) PTLD는 전체 소아 간이식 환아 41명 중 5명에서 발생하였다(12.2%). 고위험군은 16명으로 이 중 5명(31.3%)에서 PTLD가 발생하였고 저위험군 19명중에서는 한 명도 발생하지 않았다. 2) 사망례를 제외한 4명은 tacrolimus로 면역억제 치료를 받았으며 수술 당시 나이는 평균 10.8개월이었고 수술 후 PTLD 진단까지 평균 9.8개월이 걸렸 다. EBV 양전 시기는 수술 후 평균 6개월이었다. 3) 사망례를 포함한 5명 중 3명에서 PTLD 진단 이전에 간이식 거부반응이 있었고 스테로이드 pulse 치료 등 면역억제를 증가시키는 치료를 행하였었다. 4) 한 명에서 쉰 목소리 증상이 발견되어 조직검사 상 후두 PTLD와 장 PTLD로 진단하였고 나머지 네 명은 모두 혈변이 있었으며 대장 조직검사 상 장 PTLD로 진단하였다. 5) 빈혈과 저알부민 혈증은 모든 환아에서 나타나고 있었고 발열, 설사, 장출혈이 5명 중 4명에서 보였으며 식욕부진은 5명 중 3명에서 나타났다. 결 론: 10%가 넘는 발병률을 보이는 PTLD는 소아 간이식 후 매우 중요한 합병증으로서 특히 EBV의 고위험군에서 31%에 이르는 발병률을 가지고 있는 바 이들에 대하여 EBV 상태와 면역억제 유지에 대한 철저한 대비가 있어야 할 것으로 생각된다. 특히 빈혈, 저알부민혈증, 발열, 설사, 장출혈 등이 동반할 때에는 PTLD를 의심해 볼 수 있다. PTLD의 공통적인 발병양상으로는 첫째, 공여자가 EBV 양성이고 수혜자가 음성이면서, 둘째, EBV가 수술 후 6개월 경 양전되며, 셋째, 1세 전후에 수술을 시행하고 넷째, 간이식 거부반응을 겪으면서 면역억제의 강도가 높아졌을 경우 등이다. Purpose: In a retrospective study for the pediatric patients who underwent liver transplantation in the past 6 years at Samsung Medical Center, the clinical features of 5 patients with posttransplant lymphoproliferative disorder (PTLD) were analyzed. Methods: Between June 1996 and June 2002, 41 pediatric patients underwent liver transplantation. Seven of them died in the postoperative period. Thirty-five including one patient who died of PTLD were finally reviewed. Patients were divided into two groups: high risk group, EBV naive recipients of EBV-positive grafts; low risk group, the patients other than those in high risk group. The authors reviewed age at operation, immunosuppressive agent, postoperative duration until diagnosis, postoperative duration until EBV seroconversion, presence of treatment against rejection, and presenting symptoms of PTLD. Results: Five of 41 patients (12.2%) developed PTLD. All of them belonged to high risk group, and the incidence of PTLD in high risk group was 31.3% (5/16). The mean age at operation was 10.8 months old and the mean duration between operation and diagnosis for PTLD was 9.8 months. Primary EBV infection developed after a median of 6 months after transplantation. One patient was diagnosed as laryngeal and gastrointestinal PTLD and the other four, gastrointestinal PTLD. The following symptoms and signs were seen in the patients: anemia (100%), hypoalbuminemia (100%), fever (80%), diarrhea (80%), gastrointestinal bleeding (80%), and anorexia (60%). Conclusion: PTLD is one of the major complications after pediatric liver transplantation, especially in the group of high-risk recipients. Anemia, hypoalbuminemia, fever, diarrhea and gastrointestinal bleeding were features that are characteristic of PTLD. The common features of PTLD development were: (i) EBV-positive donors placed into EBV naive recipients, (ii) primary EBV infection about 6 months after transplantation, (iii) young age, about 1 year old at operation, and (iv) the requirement for intensive posttransplant immunosuppression.

위장관 1 : 소아 상부위장관내시경의 안전한 시술법

최연호 대한간학회 2006 소화기연관학회 공통 춘계학술대회 Vol.2006 No.-

소의 효율적 관리를 위한 살찐 점수의 이용

최연호 한국낙농육우협회 1999 낙농·육우 Vol.19 No.4