• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.933-936
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• 2005

본 연구에서는, 수문해석모형과 국산 GIS 엔진인 HyGIS와 직접연계를 통해 자료수집 분석, 모의수행 및 결과도시를 일괄적으로 수행될 수 있도록 GIS-수문통합모형을 개발하였다. GIS 기반 수문모형의 자동화를 위해 유역 추출, 하도망 생성, 유출 매개변수의 산정 및 수문모형 진행을 필요한 모든 과정들에 대해서 사용자 인터페이스를 구축하고, 강우자료, 레이다/위성자료, 설계강우 조건으로부터 NGIS를 활용한 수문분석을 위한 NGIS자료의 표준화 과정을 제시하였다. 수문해석을 위한 유역추적방법에는 Clark, SCS, Snyder 방법, 하도추적방법에는 Muskingum, Muskingum-Cunge 방법 등과 같은 실제 실무분야에서 많이 이용되는 방법들이 이용 가능하도록 구성하였다. 수문모형과 NGIS DB와의 Interface 기능을 활용하여 국내 실무분야에 적용함에 있어 편의성과 실용성을 갖춘 모형을 개발을 통해, 수문모형 구축 시 NGIS 자료 및 지형 DB의 표준화 과정을 제시하고자 한다.

• Particle and aerosol research
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• v.10 no.3
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• pp.93-97
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• 2014

Condensation particle counter (CPC) has been one of the most important basic instrument for measuring number concentration of submicron aerosols. The principle of the CPC is to expose aerosols to a supersaturated vapor and cool down which causes adiabatic expansion. The particles grow by heterogenous nucleation to a sufficient size for easy detection by optical method. However, for growth by condensation, CPC essentially needs both saturater and condensor causing a heavy system. Therefore, it is hard to install commercial CPC to tethered balloon package system. In this study, we developed customized CPC for tethered balloon package system called Hy-CPC which is lighter and smaller in structure than commercial CPCs, and evaluated activation efficiency and detection efficiency by Hy-CPC using electrostatic method (electrometer and Faraday cup).

• Transactions of the Korean hydrogen and new energy society
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• v.31 no.5
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• pp.459-466
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• 2020

As the hydrogen industry grows, expansion of infrastructure for hydrogen supply is required, but the safety of hydrogen facilities is concerned due to the recent accidents at the Gangneung hydrogen tank and the Norwegian hydrogen fueling station. In this study, the damage range and impact analysis on the on-site hydrogen fueling station was conducted using Hy-KoRAM. This is a domestically developed program that adds functions based on HyRAM. Through this risk assessment, it was evaluated whether the on-site hydrogen fueling station meets international standards and suggested ways to improve safety.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.06a
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• pp.291-293
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• 2010

최근 발생하고 있는 국지성 집중호우 및 돌발홍수로 인해 강원도와 경상북도 등을 중심으로 산지하천유역의 산사태 피해가 급증하고 있으며 발생면적은 연평균 402ha에 이르며 연평균 피해면적은 80년대에 비해 2000년대 들어 3배 이상 증가한 것으로 보고 되고 있다. 본 연구에서는 산지하천 유역의 토사유출재해 취약성 분석을 위해 GEOMania GMMap 기반으로 구동되는 산사태 분석모듈(HyGIS-Landslide)을 개발하였다 HyGIS-Landslide는 산림청의 산사태 위험지도 제작에 사용된 위험지역 평가기준을 참조하였으며 DEM을 이용하여 경사인자 및 사면인자를 생성하고 수치지질도, 수치임상도 산림입지도 등과의 연산을 통해 위험등급에 대한 분류결과를 제시한다. 또한, 과거 산사태 발생지역에 대한 맵핑 경과가 존재하는 경우 산사태 위험지역 분류결과를 과거 사상과 중첩하여 분류정확도를 확인할 수 있도록 제작되었다.

• Molecules and Cells
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• v.23 no.2
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• pp.154-160
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• 2007

An Arabidopsis hy4 mutant that is specifically impaired in its ability to undergo blue light dependent photomorphogenesis was used to identify cryptochrome 1 signaling-related components. Proteomic analysis revealed about 205 differentially expressed protein spots in the blue light-irradiated hy4 mutant compared to the wild-type. The proteins corresponding to 28 up-regulated and 33 down-regulated spots were identified. Obvious morphological changes in the hy4 mutant were closely related to the expression of various transcription factors. Our findings suggest that blue light signals may be involved in many cellular processes including disease resistance and stress responses.

• Journal of the Korean Society for Library and Information Science
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• v.31 no.1
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• pp.53-70
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• 1997

This paper is the result of study on what Is the characteristics of digital document, how to manage it, and what Is the consideration to manage it, compared to the conventional paper document. For the document structuring, I also explain the relationship between SGML and HyTime, and , at the same time, suggest in detail the practical examples of HyTime application.

• Journal of Drive and Control
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• v.2 no.1
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• pp.10-17
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• 2005

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.28 no.6
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• pp.18-24
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• 2010

• Journal of Life Science
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• v.14 no.5
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• pp.747-751
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• 2004

The effect of yogurt containing Hamcho (Salicornia herbacea) extract (Hamcho yogurt: HY) on the lipid concentrations in male Sprague-Dawley rats fed a cholesterol diet were studied. Rats were assigned three groups in the experiment; cholesterol diet (the CHOL group), cholesterol diet plus yogurt by lactic acid bacteria (the Y group) or cholesterol diet plus yogurt supplemented Hamcho extract by lactic acid bacteria (the HY group). Fermented milk with or without Hamcho extract in the diet supplemented at the levels 5.0% for 3 weeks. The concentrations of total cholesterol and bile acid in serum was significantly lower in the HY group than the CHOL group. This effect was also observed in rats fed a diet supplemented fermented milk. This cholesterol-lowering effect was more pronounced in the HY group compared to the Y group. The atherogenic index was significantly lower in the HY or Y groups than the CHOL group. The concentration of non esterified fatty acid in serum was significantly lower in the HY group than the CHOL and the Y groups. These results suggested that Hamcho yogurt exert the hypocholesterolemic effect in cholesterol fed rats.

• Korean journal of applied entomology
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• v.45 no.3 s.144
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• pp.301-307
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• 2006

A ligniolytic bacterial strain was isolated from the digestive tract of a red dragonfly, Sympetrum dopressiusculum. It was identified as a Serratia marcescens HY-5 by 16S rDNA sequence analysis and physiological and biochemical analysis. The isolated strain showed proportional increase of ligninolytic activity to the cell growth in the culture media which include lignin compounds. It showed about 25-45% decomposition of lignin compound by 48 hr incubation especially, showed effective decomposition of monomer lignin compounds, vanillin and guaiacol, and a dimer, dealkaline lignin. PCR amplification of 16S rDNA followed by denaturing gradient gel electrophoresis analysis showed high density of S. marcescens HY-5 in the gut of the S. depressiusculum at both gut samples which collected at different site.