• Title/Summary/Keyword: 조수기

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Late Quaternary (Late Pleistocene and Holocene) Stratigraphy and Unconformity in the Kimpo Tidal Deposits, Kyunggi Bay, West Coast of Korea (경기만 김포 조간대 지층의 제 4기 후기 층서)

  • 박용안;최경식;도성재;오재호
    • The Korean Journal of Quaternary Research
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    • v.13 no.1
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    • pp.79-89
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    • 1999

  • Three deep borings to obtain vertical continuous samples including weathered basement soils (KP-1, KP-2 and KP-3) were carried out in the reclaimed Kimpo tidal flat with purposes to establish late Quaternary stratigraphy. On the basis of detailed observations and descriptions on color, sedimentary structure and textural composition of cored sediments, four lithostratigraphic units are classified. From the stratigraphic top to bottom, they are Holocene tidal sand and muddy deposit (Unit I), early Holocene freshwater marsh muddy deposit (Unit II), late Pleistocene tidal sand and muddy deposit (Unit III) and late Pleistocene basal fluvial gravel deposit (Unit IV). In particular, Unit III is divided into two parts: the upper part-weathered and cryoturbated part during the Last Glacial Maximum (Unit III-a) and the lower part-unweathered tidal sand and muddy deposit (Unit III-b).

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Effect of Plant Populations on the Number and Weight of Ear and Gross Income in Sweet Corn (재식밀도가 단옥수수의 이삭수, 이삭무게 및 조수입에 미치는 영향)

  • 이석순;백준호
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.35 no.2
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    • pp.117-121
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    • 1990

  • A sweet corn hybrid, Golden Cross Bantam 70, was grown at 5 plant populations (5,000, 6,000, 7,000, 8,000, and 9,000 plants/10a) under the transparent P .E. film mulch to find the best yield evaluation method. Plant population did not affect early plant growth, culm length, ear height, and silking date. However, number of tillers at harvest decreased but leaf area index increased with increased plant population. Marketable ears were divided into two classes; the first grade of which husked ear weight over l50g (unhusked ear weight 230g) and the second grade of which husked ear weight between 100 and 150g (unhusked ear weight between 180 and 230g) according to the whole sale market price. Average length, thickness, and weight of marketable ears over 100g of husked ears decreased with increased plant population. The proportion of ears over 150g decreased with increased plant population. However, total number and weight of marketable ears and gross income per 10a calculated considering weight and number of ears increased with plant population. There were highly positive correlations between gross income and ear number or ear weight per unit area. At high plant populations the number of marketable ears was overestimated but ear weight underestimated compared with gross income. Dry matter yield of stover increased with increased plant population and ranged 755-944kg/10a with 20.7-24.5% dry matter content. Rice black-streaked dwarf virus infection rate was 10.6-14.9%, but it was not related to plant population.

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인공지능을 이용한 공학시스템 상태진단 및 예지

  • Yun, Byeong-Dong;Hwang, Tae-Wan;Jo, Su-Ho;Lee, Dong-Gi;Na, Gyu-Min
    • Journal of the KSME
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    • v.57 no.3
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    • pp.38-41
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    • 2017

  • 이 글에서는 인공지능을 이용한 공학시스템 고장진단 및 예지기술(PHM: Prognostics and Health Management)의 개념을 소개하고, 실제 적용 사례를 제시한다.

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