• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.865-868
• /
• 2003

ESP는 Effective System Performance의 약자로 NERSC에서 개발한 HPC 시스템에 대한 새로운 성능 측정 기준이다. 기존 HPC 시스템에서는 주로 성능 측정의 대상으로 시스템[프로세서]의 계산 성능에 주안점을 두었지만 시스템의 효율성은 무시되는 경향이 있었다. ESP는 실제 운영환경에서 배치 작업 스케줄러 및 병렬 작업 환경에 영향을 받는 시스템 효율성(ESP:Effective System Performance)을 측정하는 데 주안점을 두고 있다. KISTI 슈퍼컴퓨팅센터는 2003년 7월 국내 최고 성능의 슈퍼컴퓨터인 IBM p690+ 시스템의 도입을 완료하고 ESP를 사용하여 배치 작업 스케줄러인 LoadLeveler의 스케줄링 알고리즘에 따른 시스템 효율성 벤치마크를 수행하였다. 이 벤치마크를 통해서 효율적인 시스템 자원 활용을 위한 작업 스케줄링 알고리즘의 적용 근거를 마련하게 되었다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07a
• /
• pp.205-207
• /
• 2005

센서 네트워크는 않은 수의 센서 노드들로 구성된 네트워크로 센서를 통한 주변 정보 감지 및 감지된 정보를 처리하는 기능을 수행한다. 최근 유비쿼터스 컴퓨팅 개념의 도입과 함께 이를 실생활에 구현하기 위한 기반 기술로 큰 관심을 모으고 있다. 그러나 센서 네트워크의 일상 생활 시스템에서의 의존도가 높아질수록 이로 인한 위험성 또한 높아 질 수밖에 없다. 본 논문에서는 센서 네트워크에서의 보안 서비스를 제공하기 위하여 필수적인 키 관리 기술을 고찰하고 효율적인 키 관리 방법을 제안하고자 한다. 센서 네트워크의 구축 시 센서 노드들의 배치 특성을 고려하여 키 스트링 풀을 설정하고, 배치된 센서 노드의 위치에 따라 필요한 키를 집중적으로 분배하여 센서 네트워크 내의 공통 키 설정 확률을 높이고 센서 노드의 메모리 소모량을 줄이는 키 관리 방법을 고안하였다.

• Proceedings of the Safety Management and Science Conference
• /
• 2008.11a
• /
• pp.267-273
• /
• 2008

기술의 발전은 인간의 생활시간을 늘리는데 큰 역할을 하고 있다. 특히 조명 분야의 발전은 야간시간을 주간시간과 같이 늘리는데 지대한 역할을 하고 있다. 현재 야간의 활동 시간을 넓히는데 우요한 역할을 하던 조명의 역할이 경관의 활성화와 미적 공간 의 창출로 활용되고 있다. 또한 야간 조명은 건강과 복지에 대한 인간의 욕구를 야간 시간의 활용을 통하여 충족시킬 수 있도록 도와주고 있다. 이러한 상황에서 근린공원 의 야간 시간 이용자들이 늘어나고 있으며 야간 조명이 근린공원 이용자들의 만족도를 향상시키는 중요한 도구로 작용하고 있다. 본 연구는 근린공원 이용의 만족도와 안전성을 높이는 야간 조명의 배치를 법적 기준에 근거한 평면적 접근법에서 수목의 배치와 생육상태를 고려한 입체적 접근법으로 시뮬레이션 접근법을 제안한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2009.10a
• /
• pp.173-174
• /
• 2009

Color harmony will look good formative elements of the basic lines, shapes and colors. In this paper, we present the implementation of Johannes Itten's color balance. Yellow, red, blue, on the basis of the first color mixing between the index and second color is placed. 12 color balance made by placing a third color between the first color and second color. we recognize this 12 color balance. Edge is detected using the Canny edge operator and labeling and clustering was expressed through the colors.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2021.05a
• /
• pp.74-76
• /
• 2021

최근 정보통신기술의 발달과 개인 스마트기기 성능의 상향평준화로 멀티미디어 콘텐츠의 사용량이 증가하고 있다. 멀티미디어 서비스를 제공하는 기업들은 사용자 경험을 개선하기 위해 조회 수를 기준으로 우선순위를 부여하는 콘텐츠 배치 전략에 따라 엣지에 우선순위가 높은 콘텐츠를 배치한다. 이러한 방식은 우선순위가 아닌 콘텐츠들을 사용자에게 서비스할 때 콘텐츠 전달 속도가 증가한다. 본 논문에서는 이러한 차순위 콘텐츠들의 전달 속도를 개선하기 위하여 CDN 기반의 콘텐츠 선호도에 따른 Edge-Fog 연계 Caching 기법을 제안한다.

• Journal of the Society of Disaster Information
• /
• v.8 no.1
• /
• pp.81-92
• /
• 2012

In this study, in-depth site investigation related to design and construction of pile foundation was carried out, especially with respect to 103 large-scale bridges located in South Korea. As a result, the depths and location of investigation was unsatisfactory at the foundation investigation process. Moreover, pile load tests were not performed when the capacity of the file is calculated in planning phase, and it was difficult to determine the load capacity limit due to the fact that loading capacity was not specified in pile-loading test. The design criteria related to pile foundation does not reflect the reality of the construction site, and that causes over design, and economic inefficiency in budget. Therefore, the purposes of this study is to review case studies related to the bearing capacity of pile foundations and suggest improvements in the construction specifications.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.15 no.2
• /
• pp.157-164
• /
• 1997

This study deals with GPS-photogrammetry practicability by C/A-code reception. It allows data to be acquired and analyzed fast. Combined block adjustment method was applied at the topographical map production of coast-land. And we compared it that of conventional block adjustment. As a result, it was found that accuracy was very sensitive to the arrangement and number of control points. The accuracy in the horizontal and vertical was $\pm{2cm}$ if all of the control points was available. however accuracy was not affected at additional parameters for systematic errors' elimination and it leads to bad results when the number of control points was few and arrangement of control points was not stabilized. GPS observations were added in block adjustment, but the accuracy of block was not upgraded due to the low accuracy of C/A-code reception. So relative positioning method with carrier phases was required for high accuracy and it is expected that CPS photogrammetry with C/A-code will be used widely according to the improvement of observation methods and the development of receiver.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.33 no.2
• /
• pp.83-94
• /
• 2015

Recently, the necessity of spatial data in unaccessible area was challenged to set up various plans and policies for preparing the unification and the cooperative projects between South-North Korea. Therefore, this paper planned to evaluate the possibility of adopting the error tolerance in Geometric correction for 1/5,000 digital topographic mapping, using the PLEIADES images and the TerraSAR GCPs (Ground Control Points). The geometric correction was performed by changing the number and placement of GCPs by GPS (Global Positioning System) surveying, as the optimal placement of 5 GCPs were selected considering the geometric stability and steady rate. The positional accuracy evaluated by the TerraSAR GCPs, which were selected by optimal placement of GCPs. The RMSE in control points were X=±0.64m, Y=±0.46m, Z=±0.28m. While the result of geometric correction for PLEIADES images confirmed that the RMSE in control points were X=±0.34m, Y=±0.27m, Z=±0.11m, the RMSE in check points were X=±0.50m, Y=±0.30m, Z=±0.66m. Through this study, we believe if spatial data can integrate with the PLEIADES images and the optimal TerraSAR GCPs, it will be able to obtain the high-precision spatial data for adopting the regulation of 1/5,000 digital topographic map, which adjusts the computation as well as the error bound.

• Current Research on Agriculture and Life Sciences
• /
• v.19
• /
• pp.45-54
• /
• 2001

This study was carried out to provide fundamental data for prospective forest-road project and forest-road network arrangement through appraising existing forest-road network with density, extension distance, maximum yarding distance and yarding area, position of forest-road line considered above foundation of two theories, one is "theory of optimal forest-road density" which has expense for yarding cost and constructing forest-road minimized, the other is "theory of optimal forest-road arrangement" which has investment effect maximized. The results are as follows. 1. In density and extension distance of the forest-road by site, it was showed up that density of existing forest-road is lower than that of calculated forest-road. So, it is thought that some additional forest-roads have to be constructed. 2. In the arrangement of the forest-road network by site, it was showed up that the arrangement of calculated forest-road is higher than that of existing forest-road arrangement for the forestry and yarding function. So, it is thought that the arrangement of forest-road network have to be considered to maximize the investment effect. 3. In "mean maximum distance for yarding" and "mean area which yarding can be done" by horizontal and inclined distance, the existing forest-road networks were different from those of calculated forest-road network. So, calculated forest-road network making investment effect maximize is more effective than existing forest-road network. Hence, in prospective forest-road project, it is needed that forest-road network having "area which yarding can be done" maximized through considering function for yarding have to be constructed.

• Journal of Conservation Science
• /
• v.11 no.1 s.14
• /
• pp.52-57
• /
• 2002

Although a conservation laboratory is a kind of hospital for cultural assets, it is often planned on the standard of ordinary offices. In this study, things and conditions to be considered for a new conservation laboratory were discussed and suggested briefly, for the sections of architecture, electricity and lightning, air condition, fire protection, machinery and tools. As methods of creating a workspace adequate to conservation work, the method of dividing workspace on the basis of workstand and the method of placing machinery and tools on the basis of water supply and sewage systems were explained., Because a conservation laboratory varies in its duties and functions, it seems difficult that all the standards and conditions suggested in this study be fulfilled in every case. But understanding general standards and conditions and choosing ones adequate to special functions of each laboratory will be helpful to planning a new conservation laboratory.