• Title/Summary/Keyword: 간역

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Rice Seedling Establishment for Machine Transplanting II. Effects of Sprouting and Seed Bed Temperature on the Seedling Characteristics (수도 기계이앙 육묘에 관한 연구 II보. 간역출아방법 및 육묘상내 온도가 묘소질에 미치는 영향)

  • Yong-Dea Yun;Hyun-Ok Choi;Jong-Hoon Lee
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.22 no.2
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    • pp.32-36
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    • 1977
  • Experiments were conducted to know the effects of seed bed temperatures on the sprouting of seeds and seedling growth in the phytotron and field. Sprouting of seeds were most uniform when seed bed was stored under the straw and vinyl mulching for 48 hours after seed bed temperature increased up to 3$0^{\circ}C$ by the sun. In the phytotron, optimum temperature was 32$^{\circ}C$ for sprouting and day/night temperature of 25/30 and 20/15$^{\circ}C$ for greening and hardening of seedlings, respectively. In the field, the best results were obtained under the conditions of sprouting in the seedling chamber heated by electricity and greening the hardening under the double vinyl tunnel in the upland nusery bed.

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정부 시책

  • Korea Electrical Manufacturers Association
    • NEWSLETTER 전기공업
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    • no.94-4 s.101
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    • pp.2-16
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    • 1994
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A Study on the Development of Simple DGPS for the Coastal Survey (연안 해양 관측을 위한 간역 DGPS 개발 연구)

  • 이상룡;문동준;전호경
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.8 no.1
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    • pp.10-17
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    • 1996
  • A real time simple DGPS (SDGPS) for coastal survey is developed and in situ tested. While the accuracy of the system is almost the same as that of existing commercially available DGPS, it is very economical compared to the commercial ones. The RMS error of the positions fired by the system is estimated to be less than 2 m within the range of 30 km from the reference station. Even if the coordinates of the reference station are uncertain, they can be fixed, from the continuous GPS observation of one day, with the maximum error less than 1 m. The system is believed to be helpfully utilized to most of coastal surveys despite of some minor defects.

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Evaluation of Liquefaction Potential for Marine Silty Sand Deposits during Earthquake (서해안 사질토지반의 지진시 액상화 예측)

  • 이희명;정두영
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.6 no.1
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    • pp.23-33
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    • 1994
  • Liquefaction characteristics of the reclaimed marine sand deposits is studied by means of the dynamic response analysis and the cyclic triaxial compression test. 1) From the result of the dynamic response analysis. it was found that the amplification of ground surface maximum acceleration varied with input earthquake motions and soil data, and earthquake coefficients were proposed to be applicable in evaluating liquefaction potential by simplified prediction methods. 2) For upper and soft sand deposits with small N-value, liquefaction strengths estimated by Seed and Idriss's simplified method were lower than those by the cyclic triaxial test while those by Iwasaki & Tatsuoka's or Vs-method were not lower. 3) Simplified methods were inclined to overestimate liquefaction potential in comparison with the dynamic response analysis and the cyclic triaxial compression test Allowable depths of liquefaction(safety factor 1) were estimated to be 7-14m for 0.1 -0.2g of input maximum acceleration.

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Studies on Simplified Procedures for Freezing and Thawing of Bovine Embryos VII. Effects of freezing procedures in a liquid nitrogen container on the survival rate of mouse embryos (육우수정란 간역동결 및 융해방법에 관한 연구 제칠보. 내동제에 Sucrose 첨가에 따른 액체질소에 미치는 영향)

  • 김중규;강만종;김영훈;장덕지;강민수;김승호
    • Korean Journal of Animal Reproduction
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    • v.12 no.2
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    • pp.84-90
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    • 1988
  • This study was done with mouse embryos to determine effects of the freezing media with or without 10% sucrose, and seeding methods (pincette, no seeding, liquid nitrogen gas phase and copper wire coiled straw) on embryo survival were determined using the FDA test. The summarized results are the following. 1. The FDA score found with copper wire coiled straw, no seeding, pincette and liquid nitrogen gas phase was 3.6, 3.6, 3.3 and 3.0, respectively. There were no significant differences. 2. The embryo score shows higher (P<0.05) survival rate using a freezing medium with sucrose than the one without it. Among the seeding procedure, better resutls are copper wire coiled straw and no seeded. 3. The results suggest that copper wire coiled seeding no seeding be as good as seeding when the mouse embryos were frozen in a liquid nitrogen container using both the freezing and dilution media containing 10% sucrose.

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