• Title/Summary/Keyword: 경정

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The Development of Racing Boat for Amateur (아마추어용 경정 모터보트의 개발)

  • Kwon, Soo-Yeon;Choung, Kwang-Gyo
    • Journal of Korea Ship Safrty Technology Authority
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    • s.26
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    • pp.36-46
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    • 2009
  • 본 연구에서는 문화관광부의 2008년도 스포츠연구개발사업의 취지에 맞게 소형선에서 가장 중요시되는 경량화를 위한 신소재를 적용하여 구조적으로 충분한 강도를 가지면서 아마추어들이 편하고 안전하게 모터보트 레이싱을 즐길 수 있도록 안전성 및 성능이 우수한 아마추어용 경정 보트를 개발하였다. 본 연구개발에 있어서 목재 및 FRP등 선체재료에 따른 구조해석을 수행하여 구조강도특성을 분석하고 워터제트형 경정 모터를 개발하여 경정 보트 시제품을 건조하여 시운전을 실시하는 등 안전성 및 성능을 확인하였다.

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Structural Characteristics of Shoot Apex Developed from Somatic Embryos of Daucus carota L. (당근의 체세포배로부터 발생한 경정부의 구조적 특성)

  • 홍성식;소웅영
    • Korean Journal of Plant Resources
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    • v.12 no.2
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    • pp.133-138
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    • 1999
  • The structure of shoot apex in zygotic and somatic embryos of Daucus carota L. cv. Hongshim was observed by using SEM and longitudinal sections. Shoot apex of zygotic embryo was of an inverted boat shape, and these of two, three and four cotyledon somatic embryos were of an inverted boat shape, a pyramid shape and a convex diamond shape, respectively. In zygotic embryo shoot apex is consisted of small cells which are arranged in layers (tunica) and show corpus in central region. In somatic embryos shoot apices are consisted of somewhat large cells which are arranged in irregularly or slight regularly.

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Ultrasonography Of Jugular Vein, Carotid Artery and Thyroid Glands in Native Korean Cattle (한우에서 경정맥, 경동맥 및 갑상선의 초음파상)

  • 김명철;변홍섭
    • Journal of Veterinary Clinics
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    • v.17 no.1
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    • pp.205-208
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    • 2000
  • 소에서 경정맥, 경동맥 및 갑상선의 초으파상에 관한 기초자료를 확립하기 위하여 본 연구를 실시하였다. 한우 9두에서 6개월경으로부터 12개월령에 도달할 때까지 1개월 간격으로 성장에 따른 경정맥, 경동맥 및 갑상선의 초음파상을 측정하였다. 경정맥, 경도맥 및 갑상선은 경부의 양측에서 관찰하였다. 경정맥의 내경은 6, 7, 8, 9, 10, 11, 12 및 13개월령에서, 각각 8.5, 8.7, 8.8, 9.5, 10.0, 10.5, 11.5 및 12.2mm를 나타내었다. 경동맥의 내경은, 6, 7, 8, 9, 10, 11, 12 및 13개월령에서, 각각 7.4, 7.5, 8.6, 9.1, 9.4, 9.7, 10.1 및 10.3mm 이었다. 갑상선엽의 길이는 6, 7, 8, 9, 10, 11, 12 및 13개월령에서, 각각 28.0, 32.1, 36.4, 42.2, 51.7, 53.2, 55.1 and 58.8mm이었다. 갑상선엽의 높이는 6, 7, 8, 9. 10, 11, 12 및 13개월령에서, 각각 13.6, 15.3, 16.1, 20.7, 22.9, 25.6, 28.9 and 29.4mm를 나타내었다. 본 연구에서는 초음파측정 결과는 한우에서의 경정맥, 경동맥 및 갑상선에서의 형태학적 변화의 진단을 위한 참고자료가 될 수 있을 것으로 사료된다.

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Analysis of the 'Chukwookee' data using time series model (시계열 모형을 이용한 측우기 자료의 분석)

  • 조신섭;이정형;김병수
    • The Korean Journal of Applied Statistics
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    • v.9 no.2
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    • pp.25-43
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    • 1996
  • One of the main issues related to the precipitation amounts measured by the Korean raingage, Chukwookee, invented by King Sejong is the discontinuity in the time series around 1907 when the modern raingage was first used in Korea. To solve this discontinuity problem Wada(1971) reproduced the Chukwookee data but many authors questioned the validity of Wada's method. In this paper we analyze the precipitation amounts in Seoul from 1771 to 1994 using the intervention model and show that Wada's method results in the overestimation of the precipitation amounts. We also propose a reproduction method by considering monthly constant and including the rainfall of less then 2 mm and the snowfall which were ignored previously.

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Study on the Clonal Multiplication of Zingiber mioga ROSC. through in vitro Culture of Shoot Apex. I. Effects of Basal Media and Growth Regulators on Plant Regeneration and Growth of Plantlet (양하(襄荷)의 경정배양(莖頂培養)에 관(關)한 연구(硏究) I. 기본부지(基本部地) 및 생장조절물질(生長調節物質)이 식물체(植物體) 재분화(再分化)와 유묘(幼苗)의 생장(生長)에 미치는 영향(影響))

  • Choi, Seong-Kyu;Seo, Young-Nam
    • Korean Journal of Medicinal Crop Science
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    • v.1 no.1
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    • pp.38-42
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    • 1993
  • The present study was carried out to assess the possibility of rapid multiplication of Zingiber mioga ROSC. through in vitro culture of shoot-apex. The factor investigated was effect of various growth regulators on shoot-apex culture. The shoot-apex cultured of M. S. (Murashige and Skoog) medium developed into plantlet in 12 Weeks. M. S. medium containing NAA at 05ppm and BA 5.0ppm was found to be optimal for growth of in vitro plantlet.

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A Study on the Profits Return Ways for Promoting of the Marine and Water Sports in Korea (해양·수상 스포츠 진흥을 위한 경정 수익금 환원에 관한 연구)

  • Park, Young-Soo;Lee, Sang-Il
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.19 no.1
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    • pp.93-99
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    • 2013
  • It is expected to continue to increase the number of people who enjoy marine and water sports due to the increase of leisure time because of income increase, the five-day workweek, etc. However, in the safety awareness, the development of equipment is just in the early stage. Established system for fundraising is required for Korean marine and water sports to be developed first. Should the fund be spent on the safety and development of domestic equipment for marine and water sports, it would make for a safer and more enjoyable sports for the people. The profit return measures of motor boat race, among marine and water sports, are surveyed and analyzed to suggest the measures stated above. Japanese legal structure and the profit return measures on motor boat race, which are about 60 years ahead than Korean systems, were analyzed and led to suggest the establishment of professional institutions which promote motor boat, etc. and the legal improvement for funding.

In Vitro Shoot Tip Culture of Pear 'Niitaka' as Related to Tree Vigor Sampling Time and Plant Growth Regulators (배 '신고'의 경정배양에 있어서 모수의 수세, 경정의 채취시기 및 생장조절제의 영향)

  • 이창후;김정선;김성복
    • Korean Journal of Plant Tissue Culture
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    • v.25 no.3
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    • pp.159-163
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    • 1998
  • In vitro shoot tip culture technique was established in pear (Pyrus pyrifolia 'Niitaka') as related to tree vigor, sampling time, and plant growth regulators and sucrose supplemented to medium. Shoot tips excised in June from the tree having medium-vigor developed good shoots. BA (1.0 and 2.0 mg/L) without NAA produced shoots suitable for proliferation, and NAA supplemented to medium resulted in poor shoot growth and excessive callus formation. BA of 2.0 mg/L combined with 0.01 mg/L NAA provided shoots suitable for rooting and sucrose of 30 g/L was recommended for proliferation medium. A fourth strength MS medium supplemented with 0.1 mg/L NAA produced plantlets in good quality of root number and root length.

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In vitro Propagation using Shoot Tip Culture of Curcuma longa L. (울금의 경정배양에 의한 기내번식)

  • 최성규
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.48 no.6
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    • pp.438-441
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    • 2003
  • The present study was carried out to assess the possibility of rapid multiplication of Curcuma longa Linne through in vitro culture of shoot-apex. The factor investigated was effect of various growth regulators on shoot-apex culture. The shoot-apex cultured of MS(Murashige and Skoog) medium developed into plantlet in 16 Weeks. M.S. medium containing NAA at 0.5 ppm and BA 5.0 ppm was found to be optimal for growth of in vitro plantlet

기술개발성공사례 - 무인 체신서비스 창구시스템 개발, 삼경정보통신(주)

  • Korean Federation of Science and Technology Societies
    • The Science & Technology
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    • v.32 no.8 s.363
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    • pp.82-83
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    • 1999
  • 삼경정보통신(주)은 평일 저녁이나 일요일ㆍ공휴일 등 근무하는 사람이 없어도 연중무휴 자동으로 우편물을 발송할 수 있는 '무인 체신서비스 창구시스템'을 개발해 큰 호응을 얻고 있다. 세계 최초로 상용화된 이 무인 체신시스템은 우편물을 자동으로 인식하는 장치, 우편물 자동취급 장치, 요금증지를 발행하고 우편 바코드를 인쇄하는 장치 등이 섬세하게 갖춰진 신제품이다. 전국 주요 도시의 16개 우체국에서 선보인 제품의 가격은 4천3백50만원이다.

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