• Korean Journal of Remote Sensing
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• v.37 no.5_1
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• pp.1187-1198
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• 2021

Sea wind isrecently drawing attraction as one of the sources of renewable energy. Thisstudy describes a new method to produce a 10 m resolution sea wind field using Sentinel-1 images and low-resolution NWP (Numerical Weather Prediction) data with artificial intelligence technique. The experiment for the South East coast in Korea, 2015-2020,showed a 40% decreased MAE (Mean Absolute Error) than the generic CMOD (C-band Model) function, and the CC (correlation coefficient) of our method was 0.901 and 0.826, respectively, for the U and V wind components. We created 10m resolution sea wind maps for the study area, which showed a typical trend of wind distribution and a spatially detailed wind pattern as well. The proposed method can be applied to surveying for wind power and information service for coastal disaster prevention and leisure activities.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2000.10b
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• pp.104-108
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• 2000

토마토의 내적품질 요인에는 당, 산, 풍미, 영양, 미네랄 등 많은 인자들이 영향을 끼치나 당, 산, 풍 미등이 크게 영향을 미치는 것으로 알려져 있다. 이들 품질에 영향을 미치는 요인으로는 상당한 정도의 부정적 영향없이 근권이나, 잎에 고농도 염류에 견디는 식물의 유전적 요인이 크다고 알려져 있으나(Shannon and Grieve, 1999), 그 정도는 상대습도, 온도, 복사량, 공기오염등 환경적 요인도 작용한다(Shannon et al., 1994). (중략)

• Journal of the Korean earth science society
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• v.40 no.5
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• pp.447-463
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• 2019

Sea surface wind is a fundamental element for understanding the oceanic phenomena and for analyzing changes of the Earth environment caused by global warming. Global research institutes have developed and operated scatterometers to accurately and continuously observe the sea surface wind, with the accuracy of approximately ${\pm}20^{\circ}$ for wind direction and ${\pm}2m\;s^{-1}$ for wind speed. Given that the spatial resolution of the scatterometer is 12.5-25.0 km, the applicability of the data to the coastal area is limited due to complicated coastal lines and many islands around the Korean Peninsula. In contrast, Synthetic Aperture Radar (SAR), one of microwave sensors, is an all-weather instrument, which enables us to retrieve sea surface wind with high resolution (<1 km) and compensate the sparse resolution of the scatterometer. In this study, we investigated the Geophysical Model Functions (GMF), which are the algorithms for retrieval of sea surface wind speed from the SAR data depending on each band such as C-, L-, or X-band radar. We reviewed in the simulation of the backscattering coefficients for relative wind direction, incidence angle, and wind speed by applying LMOD, CMOD, and XMOD model functions, and analyzed the characteristics of each GMF. We investigated previous studies about the validation of wind speed from the SAR data using these GMFs. The accuracy of sea surface wind from SAR data changed with respect to observation mode, GMF type, reference data for validation, preprocessing method, and the method for calculation of relative wind direction. It is expected that this study contributes to the potential users of SAR images who retrieve wind speeds from SAR data at the coastal region around the Korean Peninsula.

• The Korea Beekeeping Bulletin
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• s.338
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• pp.23-31
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• 2008

양봉관리 방법이 양봉 농가마다 조금씩 차이가 난다. 그것은 봉장이 다르고 또한 토질과 기후도 다르가. 그리고 환경 조건도 다르며 따라서 양봉가의 성격과 양봉의 상태도 강군과 약군으로 달라지기 때문에 관리방법도 다르기 마련이다. 1월 양봉관리는 작년을 결산하고 새해는 더욱더 알찬 계획을 세워 풍성하게 수확을 할 수 있는 준비 하는 달이다. 1월의 봉군 관리는 봉군의 상태와 환기에 중점을 두어야 한다.

• The Korean Publising Journal, Monthly
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• s.223
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• pp.18-19
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• 1997

올 가을 출판계에 문학평론집의 작황이 풍성하다. 이들 평론집은 우리 문학과 작가들이 더이상 이 시대의 위기 속에서 안전하지 않다는 첨예한 문제의식을 담고 있다. 미시적인 현장비평에서 거시적 담론에 이르기까지 90년대 문학환경에 대한 자기반성이 적극적인 발언으로 표출되고 있다.

• Fire Protection Technology
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• s.10
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• pp.19-26
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• 1991

This reoprt intended to apprehend the principle for combustible phenomena in the environments and the prediction of its hazard in the virtual fire. So we first explained the basic machanism for the combustion, and discovered the tendency of the conbustion in the condition of the environmental factors(Humidity, Wind, Temperature) by means of some sxperiments about the wood as example.

• Journal of the Korea Construction Safety Engineering Association
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• s.50
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• pp.42-47
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• 2009

1910년대부터 조성된 전주시 전통한옥은 민족정신이 생생히 살아 숨쉬는 격조 높은 문화 유적으로 연간 80만명이 즐겨찾는 전북의 명소로 자리매김하였다. 대통령 자문 '건설기술 건축문화선진화위원회'(위원장 : 김진애)에 건축환경문화로 '전주 한옥마을'을 선정된 바 있는 전주시 교동과 풍남동 일대에 위치한 '전주 한옥마을'을 소개한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.31 no.8
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• pp.680-687
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• 2007

The paper presents a numerical simulation of flow of a turbulent boundary layer, representing a typical wind environment and matching a series of wind tunnel observations. The simulations are carried out at a Reynolds number of 20,000, based on the velocity U at a pseudo-height h, and large enough that the flow be effectively Reynolds number independent. Some wall models are proposed for the LES(Large Eddy Simulation) of the turbulent boundary layer over a rough surface. The Jenson number, $J=h/z_0$, based on the roughness length $z_0$, is 600 to match the wind tunnel data. The computational mesh is uniform with a spacing of h/32, as this aids rapid convergence of the multigrid solver, and the governing equations are discretised using second order finite differences within a parallel multiblock environment. The results presented include the comparison between wind tunnel measurements and LES computations of the turbulent boundary layer over rough surface.

• KIEAE Journal
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• v.8 no.4
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• pp.37-42
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• 2008

In the case that high-rise building is constructed, the surrounding wind velocity increase more than 50~100%. From this cause, many wind environmental problems can be occurred. For example, ordinary wind environmental disaster may be occurred in a region, or walking disturbed. In developed countries including USA, EU, and Japan, many efforts have been made for building wind prevention by grasping previously the effects before building constructed. But, We are bearing risk of wind environmental disaster because we have not enough recognition about building wind, and have not architectural prevention counterplans. This study aims to examine wind environmental characteristics of domestic apartment complex, and effective architectural counterplans. As the basic stage for this, we investigated pre-estimate tools and risk assessment methods of building wind in apartment complex, applied to two apart complex in Cheon-An region by CFD. As the result, serious damages were not presented. But, it is obvious that various architectural counterplans will be presented by this example researches.

• 한국전산유체공학회:학술대회논문집
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• 2010.05a
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• pp.493-495
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• 2010

A three-dimensional flow simulation is performed to investigate the flow field in the ski resort on complex terrain. The present paper aims to study the wind effects of mountainous terrain on the gondola safety. Strong wind happens in the ski resort on the mountain by complex terrain and it causes the dangerous accident of gondola. A digital map around the ski resort area is used to model the actual complex terrain for a 3-D analysis domain. Wind direction and speed to be used as a boundary condition are taken from local meteorological reports. The numerical results show details of the velocity distribution around a ski resort. From the results, we can suggest the modification of the installation of gondola for the safety due to strong wind.