• Title/Summary/Keyword: 1998-1999

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Taxonomic Study of Parholaspid Mites (Acari, Mesostigmata) in Korea (한국산 창응애과(진드기아강, 중기문목)의 분류학적 연구)

  • 이원구;이소영
    • Animal Systematics, Evolution and Diversity
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    • v.16 no.1
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    • pp.105-112
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    • 2000

  • Mesostigmatid mites were collected from forest soils in Korea from December 1998 to October 1999. Eleven species were recognized including a new species, Neparholaspis bisunensis n. sp., and three new records, Holaspina communis (Ishikawa, 1966), Holaspina multidentatus (Ishikawa, 1980) and Holaspulus montanus Ishikawa, 1995.

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Solar Ultraviolet Irratiance Incident on a Horizontal Surface at Taegu in Korea During 1995-1998 : (II) Ultraviolet-B

  • Suh, Kyehong
    • Journal of Photoscience
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    • v.6 no.1
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    • pp.5-6
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    • 1999

  • Solar ultraviolet-B (UV-B) irradiances incident on a horizantal surface at Taegu of Korea during 1995-1998 were calculated with 5 min averges of measuremets taken every 30 seconds by a broadband UV-B sensor. The maximum and minimum of monthly averages of daily UV-B dose were 15.89 KJ m-2 day-1 in April and 3.91KJm-2 day-1 on May 22, 1998 and 1.230W m-2 at 12 : 45, July 13, 1998, respectively. Increasing trend in annual maximum of instantaneous UV-B radiation was averaged to 12.0% per year during 1995-1998 of observation period.

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A Practical Guideline toy Implementation of the Web Banking Security Systems (웹기반 은행업무를 위한 보안시스템 구축방안)

  • 김상균;임춘성
    • Proceedings of the CALSEC Conference
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    • 1999.11a
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    • pp.481-492
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    • 1999

  • 연구배경 $\textbullet$ 인터넷 사용자 증대 및 웹기반 서비스 확산[Report, 1998] $\textbullet$ 웹기반 은행업우의 등장 [Arie, 1998] [임춘성, 1998] $\textbullet$ 인터넷 기반 보안 사고의 증대[임차식, 1998] $\textbullet$ 인 터넷 기반 시스템 침해 기법의 다양화[FIST, 1998] 연구필요성 $\textbullet$ 웹기반 은행 업무의 보안 위협에 대한 분석 필요 $\textbullet$ 보안 위협요소에 대한 보안 모델 수립 필요 $\textbullet$ 현존하는 보안 패키지 시스템의 웹기반 은행업무 적용방안 필요 (중략)

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A Study on the Water Quality Simulation in the Midstream and Downstream of Geum-River (금강 중하류에서의 수질모의에 관한 연구)

  • Sin, Jae-Gi;Im, Chang-Su
    • Journal of Korea Water Resources Association
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    • v.33 no.2
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    • pp.145-157
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    • 2000

  • The Water Quality Analysis Simulation Program 5 (WASP5) and HEC-2 models have been coupled and applied to find the possibility of simulation of long-term river water quality variation. The EUTR05 as a simulator of water quality simulation in WASPS model was used to simulate the water quality variables in the downstream of Geum-River from Daechung multi-purpose dam during the dry period. The water quality and flow rate conditions have been measured at the stage measurement stations located in the downstream of Geum-River from Daechung dam in December, 1998 and January and March, 1999. The water quality simulation model was calibrated with January data of 1999, and verified with December data of 1998 and March data of 1999. The trend of longitudinal variation of water quality variables simulated by model is consistent with that of measured water quality constituents except chlorophyll-a, $BOD_5,\;NH_3-N\;and\;PO_4-P$ simulated with March data of 1999. Furthennore, the chlorophyll a concentration in the mainstream of Geum-River was simulated by changing the concentrations of $PO_4-P$ and/or $NH_4-N$ flowing into the mainstream of Geum-River from Gabcheon and Mihocheon. The variation of chlorophyll a concentration in the mainstream was almost ignorable except only when $NH_3-N\;and\;PO_4-P$ concentrations decreased by 70% flow into the mainstream from Gabcheon and Mihocheon.

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