• Proceedings of the Korean Information Science Society Conference
• /
• 2000.04a
• /
• pp.39-41
• /
• 2000

본 논문에서는 이동 컴퓨팅 환경에서 사용자의 데이터 사용 유형을 분석하여, 네트워크의 영향을 감소시켜 사용자 작업을 계속 유지하는 방법에 대해 연구하였다. 이를 위해서는 데이터의 특성에 맞는 선택적 자동 저장 크기를 선별해야 하며, 기존의 판단 알고리즘외에 추가 판단기준을 도입하면 자동 저장의 적중률이 향상됨을 보인다. 또한, 자동 저장 리스트의 크기에 대한 고찰을 통해 적정 수준의 적중률을 유지하기 위한 최소한의 리스트 크기를 알아보았다.

• Journal of the Korean Association of Geographic Information Studies
• /
• v.20 no.1
• /
• pp.137-151
• /
• 2017

The space between urban buildings becomes a waterway during rain events and requires a boundary condition in numerical calculations on grids to separate overland storm flows from building areas. Minimization of the building data distortion as a boundary condition is a necessary step for generating accurate calculation results. A building generalization is used to reduce the distortion of building shapes and areas during a raster conversion. The objective of this study was to provide the appropriate threshold value for building generalization and grid size in a numerical calculation. The impact of building generation on the connectivity of urban storm waterways were analyzed for a general residential area. The building generalization threshold value and the grid size for numerical analysis were selected as the independent variables for analysis, and the number and area of sinks were used as the dependent variables. The values for the building generalization threshold and grid size were taken as the optimal values to maximize the building area and minimize the sink area. With a 3 m generalization threshold, sets of $5{\times}5m$ to $10{\times}10m$ caused 5% less building area and 94.4% more sink area compared to the original values. Two sites representing general residential area types 2 and 3 were used to verify building generalization thresholds for improving the connectivity of storm waterways. It is clear that the recommended values are effective for reducing the distortion in both building and sink areas.

• Journal of Korea Water Resources Association
• /
• v.36 no.5
• /
• pp.799-810
• /
• 2003

Hydrologic models generally require land surface analysis to different topographic parameters defined as direct or indirect input variables to the model. Specially GIS supply the these parameters from digital data set of land surface The sensitivity analysis to DEM(Digital Elevation Model) resolution and the threshold area are of GIS extracted digital data set applied GIUH(Geomorphological Instantaneous Unit Hydrograph)model is investigated. Also it is compared the responses of GIUH model as input data of stream networks from digital data set(blue line) of NGIS and those extracted from DEM of various grid sizes. The results shows that the GIUH model is significantly affected by the DEM resolution and threshold area. According to the results, DEM grid size is suitable from 25m to 50m. Also threshold area is in the range of 30%∼50% for exceedance probability.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.9 no.2
• /
• pp.33-40
• /
• 2010

In this paper, we consider three macroscopic traffic flow monitoring indices, Travel Time Index(TTI), Acceleration Noise(AN) and Two Fluid(TF) and investigate how to determine a proper rate of probe cars for producing reliable values of these indices. For the analysis, we use classical sampling theories and provide numbers of probe rates using simulation data.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.1621-1622
• /
• 2015

765 kV 가공송전선로의 안정성 관련으로 전기설비기술기준 제36조제1항 및 동 기준의 판단기준 제126조제4항제7호에 대하여 전선, 애자련, 강재, 송전철탑 및 기초에 대한 현행 기준 적정성을 검토하였다. 검토의 목적은 현재 765 kV 가공송전선로의 내력 크기를 파악하는 것이고 그 과정에서 전기설비기술기준의 개선 사항을 도출하는 것이다. 검토 방법은 현행 전기설비기술기준을 기준으로 했을 때, 한전의 765 kV 송전선로의 여유도(크기)을 파악하고, 또한 해외 기준과 비교를 통하여 우리나라 전기설비기술기준의 적정성을 평가하고자 하였다. 검토 자료는 국내 765 kV Ca-32p형 샘플설계도, 한전 관련 시방서, 국내 전기설비기술기준, 일본 전기설비기술기준 및 일본전기학회의 [송전용 구조물 설계 표준, JEC-127-1979]이다. 향후 다른 철탑형들의 추가 검토와 미국 및 유럽의 기준들과 대비 분석을 진행할 예정이다.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2010.05a
• /
• pp.43-46
• /
• 2010

본 연구는 강우-유출모형을 이용하여 레이더 반사도(CAPPI)의 격자 크기에 따른 유출량 오차를 추정하여 적절한 레이더 격자망 크기를 알아보고자 한다. 현재 레이더 격자 크기의 선정 기준은 명확하게 결정되어 있지 않지만, 통상적으로 바람의 영향을 고려하여 격자크기를 4km ${\times}$ 4km를 선정하고 있다. 이런 격자 크기의 결정방법은 바람의 영향만을 고려하였기 때문에 수문학적 적용에 있어 한계점을 가지고 있다. 따라서 강우-유출모형인 SWAT을 이용하여 레이더 격자의 크기를 변화에 따른 유출량의 영향을 파악하고자 한다.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2017.10a
• /
• pp.190-190
• /
• 2017

• Journal of Animal Environmental Science
• /
• v.5 no.3
• /
• pp.197-202
• /
• 1999

퇴비화 재료를 혼합하는 목적은 재료를 퇴비황에 최적조건으로 조성하여 퇴비화 성능을 향상 시키고 취기발생을 억제하기 위함이다. 퇴비화성능에 미치는 요인으로서는 C/N비, 수분 함량, 산도(pH), 산물밀도, 입자크기 등이 있다. 이 중에서 C/N비는 적정값으로 조성하기 어렵다. 본 자료는 퇴비재료의 적정 수분 함량 및 C/N비를 조성하기 위해 각 요소재료의 혼합비율을 제시하고 있다.

• Fire Science and Engineering
• /
• v.28 no.4
• /
• pp.50-56
• /
• 2014

The quantification of fire size in buildings must be preceded in order to design the trial of performance based design (PBD). When design fire size is determined appropriately, the trial design will become economical and safe design against fire risk. There are many problems in determining design fire size because of lacks of fire engineering data and short history of PBD in korea. Therefore, this paper has surveyed the guideline of design fire in other countries, real experimental data for a few occupancies and the cases of design fire size determining for PBD in Korea. Also, it has proposed the guideline of design fire size for various occupancies in korea after analyzing the appropriateness of design fire size.

• The Korean Journal of Applied Statistics
• /
• v.20 no.2
• /
• pp.245-255
• /
• 2007

In playing Baduk, Black plays first and, thus, can control the pace of a game. Usually a player with black stones plays conservatively to maintain the advantage of playing first. The purpose of dum is to compensate for Black having the first move. Currently, 6.5-point dum is applied in Korea and Japan, while 8-point dum is applied in Taiwan and China. In this study we investigated whether the current size of dum(6.5 points) is optimal, by statistically analyzing and comparing the advantage of taking Black across two data sets with different dun rules. Under the 5.5-point handicap, Blacks won significantly more games than Whites, revealing the advantage of playing first. However, with 6.5-point dum, Black's advantage of playing first was not significant. In Conclusion, implications and future research areas are discussed.