• 한국융합학회논문지
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• 제11권8호
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• pp.23-31
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• 2020

정보 통신과 스마트폰 등의 발달로 인한 편리한 접근성과 다양한 아이템의 종류로 인해 개인 맞춤형 추천의 필요성은 점차 커지고 있다. 날씨 및 기상환경은 사용자의 장소 및 활동의 의사결정에 많은 영향을 미친다. 이러한 날씨 정보를 이용하면 추천에 대한 사용자의 만족도를 높일 수 있다. 본 논문에서는 모바일 플랫폼에서 사용자의 위치 정보에 대한 생활지수를 활용하여 성향이 유사한 사용자를 구하고 장소에 대한 선호도를 예측하여 장소를 추천함으로써 생활지수를 이용한 협업 필터링 기반 장소 추천 시스템을 제안한다. 제안된 시스템은 사용자의 날씨를 분석하고 분류하기 위한 날씨 모듈과 장소 추천을 위한 협업 필터링을 사용하는 추천 모듈, 그리고 사용자의 선호도 및 후기 관리를 위한 관리 모듈로 구성된다. 실험 결과, 제안된 시스템은 협업 필터링 알고리즘과 생활지수의 융합 및 개인의 성향을 반영하는 측면에서 유효함을 확인할 수 있었다.

• Journal of Astronomy and Space Sciences
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• 제21권4호
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• pp.441-452
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• 2004

실시간 관측자료를 사용하여 현재상태를 진단하고 이후의 변화를 예보하는 것은 우주환경 모니터링 시스템의 필수적인 요소라 할 수 있다. 본 연구에서는 ION(IDL On the Net)을 이용하여 웹 기반의 우주환경모니터링 시스템을 구축하였다(http://sun.kao.re.kr). 이 웹 페이지에서는 현재의 태양 및 지자기 데이터를 보여주고 위성, 통신, 지상 전력시스템에 줄 수 있는 영향을 예측하여 제시하고 있다. 그리고 NOAA/SEC에서 매일 제시하는 태양 X선 플레어, 프로톤 현상, 지자기 폭풍의 예보결과를 표시한다. 또한 행성간 태양 충격파와 CME(Coronal Mass Ejection; 코로나 물질 방출)의 지구도달 시간을 예측하기 위해 두 가지의 예측모델이 웹에서 구동되도록 하였다. 현재 우리는 여러가지 태양 및 지자기 활동과 관련된 각종데이터를 IDL과 FTP 프로그램을 사용하여 실시간으로 다운받아 우주환경 데이터베이스를 확장하고 있다. 본 논문에서는 한국천문연구원의 우주환경모니터링시스템 개발에 관하여 자세히 기술한다.

• 대기
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• 제24권2호
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• pp.173-188
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• 2014

The KMA has cooperated with the Oklahoma University in USA to develop a Polarimetric Radar Data (PRD) simulator to improve the microphysical processes in Korea Local Analysis and Prediction System (KLAPS), which is critical for the utilization of PRD into Numerical Weather Prediction (NWP) field. The simulator is like a tool to convert NWP data into PRD, so it enables us to compare NWP data with PRD directly. The simulator can simulate polarimetric radar variables such as reflectivity (Z), differential reflectivity ($Z_{DR}$), specific differential phase ($K_{DP}$), and cross-correlation coefficient (${\rho}_{hv}$) with input of the Drop Size Distribution (DSD) and scattering calculation of the hydrometeors. However, the simulator is being developed based on the foreign observation data, therefore the PRD simulator development reflecting rainfall characteristics of Korea is needed. This study analyzed a potential application of the 2-Dimension Video Disdrometer (2DVD) data by calculating the raindrop axis ratio according to the rain-types to reflect Korea's rainfall characteristics into scattering module in the simulator. The 2DVD instrument measures the precipitation DSD including the fall velocity and the shape of individual raindrops. We calculated raindrop axis ratio for stratiform, convective and mixed rainfall cases after checking the accuracy of 2DVD data, which usually represent the scattering characteristics of precipitation. The raindrop axis ratio obtained from 2DVD data are compared with those from foreign database in the simulator. The calculated the dual-polarimetric radar variables from the simulator using the obtained raindrop axis ratio are also compared with in situ dual-polarimetric observation data at Bislsan (BSL). 2DVD observation data show high accuracies in the range of 0.7~4.8% compared with in situ rain gauge data which represents 2DVD data are sufficient for the use to simulator. There are small differences of axis ratio in the diameter below 1~2 mm and above 4~5 mm, which are more obvious for bigger raindrops especially for a strong convective rainfall case. These differences of raindrop axis ratio between domestic and foreign rainfall data base suggest that the potential use of disdrometer observation can develop of a PRD simulated suitable to the Korea precipitation system.

• 한국구조물진단유지관리공학회 논문집
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• 제24권6호
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• pp.189-196
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• 2020

초고층 건축물과 같은 대형 건축물의 부재가 대형화 되면 수화발열로 인하여 내 외부 온도차가 커져 균열이 발생한다. 잠열재인 상전이 물질을 수화열저감재로써 사용하는 방법은 다른 방법들보다 접근성, 사용성, 효율성이 높다. 이에 따라 수화열저감재로 상전이 물질을 사용한 연구들이 많이 진행되고 있다. 하지만 상전이 물질은 상전이 반응온도가 다르기 때문에 외기온도, 콘크리트 비빔온도 같은 환경요인에 영향을 받을 수 있는데 이를 고려한 연구는 미미한 수준이다. 따라서 본 논문에서는 서중환경에서 수화열저감재를 사용한 콘크리트의 수화발열 특성과 품질을 평가하였다. 그 결과, 서중환경에서 스트론튬계 수화열저감재를 3wt.%, 5wt.%를 혼입했을 경우, OPC수준보다 수화발열은 8%, 21% 저감이 가능하고 발열속도는 약 75분, 85분 정도 지연할 수 있는 것으로 나타났다. 이는 온도가 높을 때 상전이 반응이 상대적으로 촉진되어 실험실환경보다 향상된 성능 나타난 것으로 판단된다. 향후 서중환경에서 다른 종류의 수화열저감재 효율과 비교하고, 장기 재령에서의 강도발현 등에 대한 세부적인 검토를 진행할 예정이다.

• 환경영향평가
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• 제12권4호
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• pp.281-290
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• 2003

The influence of land-use type on surrounding temperature was studied the relationships between land-use types and the air condition analyzing AWS (Automatic Weather Station) data of Seoul from KMA (Korea Meteorological Administration). The distribution of air temperature by land-use type has been influenced by the different heating and cooling rates. The difference of heating rates depending on the land-use type was largest at 2~3hours after sunrise and the difference of cooling rates was largest from 2hours before sunset to 2hours after sunset with its maximum at sunset. The difference of cooling rates is greatest in a clear and calm weather situation and the large difference in cooling rates between the green areas and built-up area is up to $1.5^{\circ}C/h$. By season, the difference of cooling rates is largest in fall and in turn spring, winter and summer. In a cloudy or rainy day, the difference in heating and cooling rates on land-use type is not distinct but the tendency is similar to a clear day. In all seasons, the rate of difference occurrence of the daily range of temperature between the green areas and built-up area was large, especially fall. In a fall with a clear and calm day, the magnitude of the daily range of temperature between the green areas and built-up area was largest.

• 한국농공학회논문집
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• 제60권3호
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• pp.15-25
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• 2018

Estimating the reference evapotranspiration is an important factor to consider in irrigation system design and agricultural water use. However, there is a limitation in using the FAO Penman-Monteith (FAO P-M) equation, which requires various meteorological data. The purpose of this study is to compare three reference evapotranspiration (ETo) equations in the case of meteorological data missing for 11 study weather stations. Firstly, the FAO P-M equation is used for reference potential evapotranspiration estimation with the actual solar radiation data $R_n$ and the actual vapor pressure $e_a$. Then, in the case of $R_n$, and $e_a$ are missed, the reference evapotranspirations applying FAO P-M, Priestley-Taylor (P-T), Hargreaves (HG) equation were calculated using other meteorological factors. Secondly, MAE, RMSE, $R^2$ were calculated to compare ETo relationship from the ETo equations. From the results, ETo with Hargreaves equation in coastal areas and the Priestley-Taylor equation in the inland areas showed relatively high correlation with FAO P-M when $e_a$ data is missed. In the case of $R_n$ data is missed or two weather data, $e_a$, and $R_n$ data are all missed, $R^2$ value in Priestley-Taylor equation was highest in coastal areas, and $R^2$ values in Hargreaves equation were the high values for 7 inland areas. The results of sensitivity analysis showed that net radiation was the most sensitive for P-T and HG equation, and for FAO P-M, the most sensitive factor was net radiation and relative humidity, air temperature and wind speed were follows. Therefore, in considering of the accessibility to the coast, the types of the missing wether data, and the correlation and the magnitude of error, the reference evapotranspiration equations would be selected in sense of different conditions.

• 대기
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• 제23권4호
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• pp.413-424
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• 2013

Urban Heat Island (UHI) intensity is one of vital parameters in studying urban boundary layer meteorology as well as urban planning. Because the UHI intensity is defined as air temperature difference between urban and rural sites, an objective sites selection criterion is necessary for proper quantification of the spatial variations of the UHI intensity. This study quantified the UHI intensity and its spatial pattern, and then analyzed their connections with urban structure and metabolism in Seoul metropolitan area where many kinds of land use and land cover types coexist. In this study, screen-level temperature data in non-precipitation day conditions observed from 29 automatic weather stations (AWS) in Seoul were analyzed to delineate the characteristics of UHI. For quality control of the data, gap test, limit test, and step test based on guideline of World Meteorological Organization were conducted. After classifying all stations by their own local climatological properties, UHI intensity and diurnal temperature range (DTR) are calculated, and then their seasonal patterns are discussed. Maximum UHI intensity was $4.3^{\circ}C$ in autumn and minimum was $3.6^{\circ}C$ in spring. Maximum DTR appeared in autumn as $3.8^{\circ}C$, but minimum was $2.3^{\circ}C$ in summer. UHI intensity and DTR showed large variations with different local climate zones. Despite limited information on accuracy and exposure errors of the automatic weather stations, the observed data from AWS network represented theoretical UHI intensities with difference local climate zone in Seoul.

• 한국재난정보학회 논문집
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• 제10권1호
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• pp.105-115
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• 2014

본 연구에서는 지능형 CCTV를 이용하여 자동 수위감지 알고리즘과 사전 경보시스템을 개발하고 Test-Bed에 적용하여 실용화 가능성을 검증하고자 한다. 이를 위하여 현장여건에 적합한 지능형 CCTV 기반의 자동 수위감지 알고리즘을 개발하고 자동인식률 가변 요소에 대한 성능저하 방지대책을 수립하여 CCTV 카메라 기종별 수위감지 성능과 적합성을 평가하고 실용화에 따른 최적 적용방안을 도출한다. 그 결과, CCTV 카메라 기종별 수위감지 성능이 90%으로 도출되었다. CCTV 카메라 기종에 따른 적합성 평가 결과, 자동 수위감지용으로 NIR카메라가 정밀도에서 주 야간 95%이상의 성능을, 떨림 안개 저조도 등 자연환경에서 가장 우수한 성능을, 설치용이성에서는 일반카메라와 대등한 성능을, 가격측면에서 일반카메라 대비 15% 최소 상승분으로 가장 우수했다. 따라서 본 연구개발의 성과물인 지능형 CCTV를 이용한 수위감지 경보시스템의 실용화 가능성을 확인하였으며 향후 실용화가 예상된다.

• KIEAE Journal
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• 제12권6호
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• pp.113-121
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• 2012

A hospital is the most important infra-facility of the places which take care of people's body in social environment. There exist several environmental factors in the ways to heal the human body in hospital ward, but this study tried to look into the improvable pleasant sickroom environment with focus on light environment among the factors. In other words, this study aims at the research on proper daylight inflow into sickroom space as basic data for understanding the link between healing environment and natural lighting. In the simulation analysis through this research, this study completed the initial simulation using Autodesk Revit 2011 with focus on two types of individual multi-bed room units of the two general hospitals located in Gwangju City. This study made a simulation analysis of The two multi-bed rooms looking to the west using the weather data on Gwangju district, which is the strong point of ECOTECT2011. Conclusively, looking into the analysis of the simulation model in time of attaching the length of in & outside light shelf, the angle controlling of light shelf, the daylight factor and DA were found to show the tendency to decrease in the numerical value due to the decrease in sunlight inflow as the simulation model moved more toward the room from the window in comparison with the existing analysis of multi-bed rooms. Particularly, this study was able to read that the daylight factor and DA were more decreasing to improve at the light shelf than the existing bedrooms; conclusively, this study judges that the natural lighting simulation analysis could be helpful in improving the healing environment as basic data.

• 대기
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• 제34권1호
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• pp.1-21
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• 2024

Private companies are increasingly required to take more substantial actions on climate change. This study introduces the principle and cases of climate (physical) risk estimation for 11 private companies in Korea. Climate risk is defined as the product of three major determinants: hazard, exposure, and vulnerability. Hazard is the intensity or frequency of weather phenomena that can cause disasters. Vulnerability can be reflected in the function that explains the relationship between past weather records and loss records. The final climate risk is calculated by multiplying the function by the exposure, which is defined as the area or value of the target area exposed to the climate. Future climate risk is estimated by applying future exposure to estimated future hazard using climate model scenarios or statistical trends based on weather data. The estimated climate risks are developed into three types according to the demand of private companies: i) climate risk for financial portfolio management, ii) climate risk for port logistics management, iii) climate risk for supply chain management. We hope that this study will contribute to the establishment of the climate risk management system in the Korean industrial sector as a whole.