CFRP복합재료의 적층각에 따른 가공 특성

정성택,박종남,김선진,조규재 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-

In recent days the more use of CFRP composite is in the airplane, automobile, and sport goods, etc., the more necessity of research on it in this engineering. In this research, the CFRP composite specimen are fabricated by 48 CFRP plies with 8 orientation angles, and the specimens are drilled with 3 tools. The results are analyzed with consideration of cutting force, type of tools and fabrication condition. The specimens with each drilling conditions are also investigated with SEM. The optimal drilling conditions such as drill types and cutting force with respect to the fabricating condition are studied.

CFRP복합재료의 적층수와 드릴직경에 관한 연구

정성택,박종남,조규재 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.6

CFRP composite has a lot of merits such as mechanical characteristic, light weight, and thermal resistance. For these merits CFRP is applied to so many industrial area. In order for the composite materials to be used in the air& structures or machine elements, accurate surfaces for bearing mounting or joints must be provided, which require precise machining. In this paper, the relationship between the stack thickness and drill diameter is examined from the drilling experiment, which is the drilling of 16, 32, 48plies specimen with the φ8, φ10, φ12mm cemented carbide drill. The results are analyzed with consideration of cutting force, stack thickness and drill diameter.

적층구성이 다른 복합재의 드릴 가공에 관한 연구

정성택,박종남,조규재,심재기 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-

In recent days the more use of CFRP composite is in the airplane, automobile, and sport goods , etc., the more necessity of research on it in this engineering. In this research, the CFRP composite specimen are fabricated by 48 CFRP plies with 6 stacking sequences, and the specimens are drilled with 4 tools. The results are analyzed with consideration of cutting force, type of tools and fabrication condition. The specimens with each drilling conditions are also investigated with SEM. The optimal drilling conditions such as drill types and cutting force with respect to the fabricating condition are studied.

CFRP복합재료의 적층수와 드릴직경에 따른 가공 특성

정성택,박종남,조규재 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

CFRP composite has a lot of merits such as mechanical characteristic, light weight, and thermal resistance. For these merits CFRP is applied to so many industrial area. In this paper, the relationship between the stack thickness and drill diameter is examined from the drilling experiment, which is the drilling of 16, 32, 48plies specimen with the φ8, φ10, φ12mm cemented carbide drill. The results are analyzed with consideration of cutting force, stack thickness and drill diameter.

볼나사 지지 구조와 베어링 조합 배열에 관한 연구

홍성오,정성택,조규재 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3

In order to achieve high precision machine tools, Performance enhancement of feed drive systems is required. One of the important technical issues is how to decrease thermal expansion of ball screw in proportion to the increase of machining speed. When measuring force of stretch of ball screw, since not only actual expansion and the value of bending have to be considered, it is impossible to define the exact value of expansion. In addition, support bearings of ball screw gain considerable force in axial direction. It also generates thermal expansion on the ball screw, and deteriorates the performances of the bearings. In conclusion, it is impossible to give the pretension enough to absorb all the elongation due to thermal expansion generated during machine is running. If give, bed column and saddle are all bent to change machine accuracy, and the support bearings of ball screw is damages.

완전 고환성 여성화 증후군 1례

이원주,김택훈,권경익,김종인,조남규,박세출 啓明大學校 醫科大學 1993 계명의대학술지 Vol.12 No.2

저자들은 외형상 여성으로써 원발성 무월경과 양측 외음부 종양 촉지를 주소로 입원한 complete testicular feminization syncrome 1례를 경험하였기에 이를 문헌고찰과 함께 보고하는 바이다 The 46, XY individual with complete testicular feminization syndrome is a phenotypic female who is usually somewhat tall, has excellent breast development and presents to the gynecologist because of primary amenorrhea and an inguinal mass. In complete testicular feminization syndrome, axillary and pubic hair are sparse or absent and some degree of virilization such as clitorial hypertrophy, partial labioscrotal fusion and hirsutism doesn't occur at puberty. We report a case of complete testicular feminization syndrome with the brief review of literatures.

Development of a Core Set of Korean Soybean Landraces [Glycine max(L.) Merr.]

Cho, Gyu-Taek,Yoon, Mun-Sup,Lee, Jeong-Ran,Baek, Hyung-Jin,Kang, Jung-Hoon,Kim, Tae-San,Paek, Nam-Chon The Korean Society of Crop Science 2008 Journal of crop science and biotechnology Vol.11 No.3

A total of 2,765 accessions were used as the initial set having both seed coat color and 100-seed weight data. As a result of molecular profiling using six SSR markers followed by stratification based on their usages, 335 accessions(12.1%) were selected by clustering based on UPGMA. Since 75 out of 335 accessions were mixed in phenotypic traits as a result of characterization, 260 accessions were finally set as a core set. This core set revealed nearly the same diversity compared with the other results on morphological traits of Korean soybean landraces. In total, 115 alleles(19.2 alleles per locus) were detected in the initial set and 79 alleles(13.2 alleles per locus) were detected in the core set. All 30 major alleles were present in the initial set and in the core set as well. In allele coverage, the core set was 71.4% of the initial set. These comparisons of number of alleles, gene diversity and coverage indicated that the core set represented the entire set well.

Genetic Diversity and Population Structure of Korean Soybean Landrace [Glycine max(L.) Merr.]

Cho, Gyu-Taek,Lee, Jeong-Ran,Moon, Jung-Kyung,Yoon, Mun-Sup,Baek, Hyung-Jin,Kang, Jung-Hoon,Kim, Tae-San,Paek, Nam-Chon The Korean Society of Crop Science 2008 Journal of crop science and biotechnology Vol.11 No.2

Two hundred and sixty Korean soybean landrace accessions were analyzed for polymorphism at 92 simple sequence repeat(SSR) loci. The 995 identified alleles served as raw data for estimating genetic diversity and population structure. The number of alleles at a locus ranged from three to 27 with a mean of 10.4 alleles per locus. $F_{ST}$ values estimated by analysis of molecular variance(AMOVA) using SSR data set were 0.018, 0.027, and 0.016 for usage, collection site and maturity groups, respectively, indicating little genetic differentiation. The model-based clustering analysis placed the accessions into three clusters(K=3) with 0.0503 of $F_{ST}$, indicating moderate genetic differentiation. Duncan's Multiple Range Test at K = 3 on the basis of 18 quantitative traits revealed that one cluster was mainly differentiated from the other two clusters by seed related traits and the other two clusters were differentiated from each other by biochemical traits. Genetic structure of Korean soybean landraces was differentiated by model-based clustering and supported by their phenotypic traits in part. This preliminary study could be the first step towards more efficient germplasm management and utilization of soybean landraces and helpful in association studies between genotypic and phenotypic traits in Korean soybean landraces.

연구보문 : 독일 종자은행의 식물유전자원 관리 체계

조규택 ( Gyu Taek Cho ),성정숙 ( Jung Sook Sung ),정종욱 ( Jong Wook Chung ),박종현 ( Jong Hyun Park ),강정훈 ( Jung Hoon Kang ),김창영 ( Chang Yung Kim ),김정곤 ( Chung Kon Kim ),백형진 ( Hyung Jin Baek ) 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.3

세계 최대의 종자은행 중의 하나인 독일의 IPK-Genebank는 종자은행의 관리 최적화와 분양활용에 필요한 고객만족을 위하여 연구 및 서비스에 다음과 같은 농업유전자원관리체계로 운영하고 있다. 1. 종자은행자문회의(Genebank Advisory Board)는 종자은행과 관련된 사안에 대하여 간부위원회(Governing Board)와 기관장위원회(Board of Directors)에 조언을 한다. 2. IPK-Genebank의 임무는 수집, 보존 및 분양으로 특성조사 및 정보화, 자원관리 및 평가, 분류 및 진화 등 3개의 프로그램으로 구성되어 있다. 특성조사 및 정보화 프로그램은 게놈다양성, 종자은행 정보화, 식물 아키텍쳐 등 3개 연구그룹으로 구성되어 있고, 자원관리 및 평가 프로그램은 자원 유전학 및 증식, 기내 및 초저온 보존, 위성 보존소 등 3개 연구그룹으로 구성되어 있다. 3. 독일의 유전자원관리는 IPK-Genebank 중심의 중앙 관리 방식으로 되어 있으며, 2009년말 현재 779속 2,649종 146,966점의 유전자원과 400,000점 이상의 석엽표본을 보존하고 있다. 또한, 영양번식자원의 기내보존을 위하여 초저온 보존을 수행하고 있으며 무독묘 생산 임무도 병행하고 있다. 4. 증식은 연간 10,000점 내외로 자체에서 실시하고 있으며, 주요 평가대상으로는 곡류의 환경내재해성 평가와 수집시기의 간격에 따른 유전적 변이 조사 등을 수행하고 있다. 5. IPK-Genebank는 유럽 최대 규모의 유전자원저장시설로 매년 10,000-15,000점의 유전자원이 국내외로 분양하고 있으며 1952년 이래 누적규모는 720,000점에 달한다. 분양은 온라인 및 메일 등으로 신청가능하며, 2008 및 2009년에는 18,480점과 22,799점을 각각 분양하였다. 6. 종자은행 관리를 위한 내부 시스템으로 GBIS/Management, 인터넷 정보제공 시스템으로 GBIS/Internet을 개발 운영하고 있으며, 다양한 포맷과 분산 관리되고 있는 식물관련 특이적 데이터의 효율적 분석을 위하여 데이터 웨어하우스 기법을 활용하고 있다. 7. 2007년에는 종자은행 운영 및 관리 최적화를 위하여 보존종자의 품질인증을 획득(ISO 9001:2000)하였으며, 유전자원 관리 연구를 통하여 관리와 이용성 증진에 있어 국제적으로 인정받고 있다. The Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) in Gatersleben is one of the largest and internationally most renowned plant research centers working on plant genetic resources. With the central ex situ gene bank, IPK possesses a unique collection of approximately 147,000 plant genetic resources from 2,649 botanic species of about 800 different genera. A substantial part of the collection is stored as seeds at temperatures of -17oC. Vegetatively propagated material is conserved either by permanent field culture or through in vitro cultures and/or cryo-conservation under liquid nitrogen. The Genebank possesses comprehensive reference collections including a herbarium with more than 400,000 samples. As a subcommittee of the Scientific Advisory Board, the Genebank Advisory Board provides advice to the Governing Board and the Board of Directors in accordance with the Scientific Advisory Board concerning issues related to the genebank. The federal ex-situ collection of agricultural and horticultural plants forms the core of the department, which is structured into three programmes, Characterization & Documentation, Management & Evaluation, and Taxonomy & Evolution. The mandate of the Genebank comprises the collection, conservation, and distribution of plant genetic resources. Satellite collections of the gene bank are situated in Groß L?sewitz and Malchow/Poel (Mecklenburg-West Pommerania). IPK-Genebank aims to limit 160,000 accessions for its total collections by adding 400 new accessions every year. The average number of accessions grown in the field or greenhouse for seed multiplication is about 10,000 per year. Evaluations are carried out mainly for resistances to biotic/abiotic stresses and genetic variations. The average number of yearly distributed samples of IPK-Genebank is from 10,000 to 15,000, totalling 720,000 since 1952. For management optimization and customer satisfaction, IPK-Genebank has developed Genebank Information Systems composed of the internal genebank management software and the internet portal for searching and ordering genebank accessions and established Quality Management System according to DIN EN ISO 9001:2000.

연구보문 : 미국의 식물유전자원 관리체계

조규택 ( Gyu Taek Cho ),김현순 ( Hyun Soon Kim ),백형진 ( Hyung Jin Baek ),이석영 ( Sok Young Lee ),마경호,윤문섭 ( Mun Sup Yoon ),고호철 ( Ho Cheol Ko ),김정곤 ( Chung Kon Kim ) 한국국제농업개발학회 2010 韓國國際農業開發學會誌 Vol.22 No.4

미국의 식물유전자원 관리체계는 1974년에 구성된 농업연구청 주도의 연구 및 협력 지역 분권화 시스템으로 각 주립보존소는 각기 고유한 유전자원을 취급하며 보존소간의 위치는 동등하며 국가식물유전자원프로그램으로 운영된다. 1. 미국의 식물유전자원체계(ARS NPGS)의 지원은 농업연구청(ARS), 협동연구교육지도청(NIFA)이 참여하고 있으며, 주립농업시험장(SAES)과 관련 이익단체 등 지방기관도 참여하여 3원 협조 지원체계를 가지고 있으며 미국 4개 권역에 걸쳐 29개 기관이 분포하고 있다 2. 미국의 식물 유전자원 관리는 ARS의 국가프로그램 301의 하나로 Plant and Microbial Genetic Resource Management에서 예산을 지원하고 있으며, 식물유전자원을 보좌하는 주요 자문기구로는 식량 및 농업 유전자원의 보존과 활용에 관한 국가적으로 중요한 사항에 대응하는 국가유전자원자문위원회(NGRAC), 국가 협의회에게 유전자원과 관련된 정책이나 우선순위에 관한 자문을 담당하는 국가식물유전자원위원회(NPGRB), 이용자 공동체를 대변하고, 기관간 협력을 촉진하며 정보의 원천으로 활용되는 작물유전자원위원회(CGC), NPGS 기관들 간의 의사소통 활성화 및 협력촉진을 위한 식물유전자원운영위원회(PGOC), 지역기술자문위원회(RTAC) 등 이 있다. 3. NPGS 산하 기관의 기본 임무는 육종, 연구, 교육 및 지도 프로그램을 위한 미국 및 전세계 과학자들에게 유전자원 공급하는 것과 유전자원수집, 교환, 도입, 증식, 평가, 정보화, 보존, 관리 및 분양이다. 4. 2009년 미국의 식물유전자원 총 누적 보존수는 약 530,000점이며 20,000여점의 자원을 확보하였고 유전자원의 분양은 최근 5년간 연평균 약 140,000여 점에 이른다. 5. 미국의 시스템을 고려하면 우리나라는 자원다양성 확보 효율적 관리를 위한 창구단일화 제도, 유전자원 관리기관지정 운영제도 내실화를 위한 실질적 Sub-Bank의 운영 및 유전자원 활용도 제고를 위한 기초연구 등을 강화하여야 할 것으로 판단된다. The United States is operating the National Plant Germplasm System(NPGS), a network of organizations and people to preserve the genetic diversity of crop plants. Plant genetic resources are collected by this national system from all over the world, including the United States. Curators and other scientists preserve, evaluate, and database this germplasm and distribute it to people with a research or educational use. Members of the National Plant Germplasm System include Federal, State, and private organizations and research units. The system is coordinated by the Agricultural Research Service(ARS), a principal research agency of the U.S. Department of Agriculture. Federal appropriations and State contributions support and fund for land, lab, and office space, scientists, and other employees. To maintain the diversity, the National Plant Germplasm System of the United States has 29 repository sites all over the country. Each repository site collects new germplasm, evaluates, preserves, and distributes it for their responsible crops. Several advisory committees including 42 crop germplasm committees support the National Plant Germplasm System.