• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2018.11a
• /
• pp.382-384
• /
• 2018

한국형 e-Navigation에서 운영되는 각 서비스에서 사용되는 데이터에 대한 DB 입출력 데이터에 대해서 각 서비스에서 직접적인 DB 접근 방식이 아닌 간접적인 DB접근 방식을 적용하여 보다 효율적으로 데이터가 관리가 될 수 있는 서비스 방식에 대한 설계를 진행하였다. 또한 전자해도 정보를 DB화 하여 전자해도 정보를 이용하는 서비스에 제공한다.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.40 no.5
• /
• pp.477-484
• /
• 2020

Reservoir operation affects the sustainability of a water supply. However, the increase in the temporal and spatial variability of rainfall, attributed to climate change, has led to severe droughts and increased difficulty in maintaining a sustainable discharge at certain locations in a reservoir system operation. In this study, water yield was evaluated using reservoir simulation with varied water supply. Three reservoir system models were simulated for nine reservoirs in the Han River basin. The time-based reliability, volumetric reliability, and resiliency were used to evaluate the results. Each case was simulated by applying firm supply, deficit supply, and deficit supply with historical power release of the Hwacheon Reservoir. As a result of the simulation, all indexes were increased when the deficit supply was applied. In particular, the time-based reliability increased by more than 30%, and the supply reliability increased by about 4%. The result showed that the water supply of the entire water system could be increased when all reservoirs in the water system were operated to supply water and maintain sustainable discharge at the same downstream point. The deficit supply was an efficient reservoir operation method for responding to climate change, especially increased rainfall variability.

• Proceedings of the Korean Information Science Society Conference
• /
• 2000.10b
• /
• pp.580-582
• /
• 2000

본 논문에서는 현 교육의 문제점을 해결하고 학생들 개개인의 특기.적성을 살릴 수 있는 클럽활동 프로그램에 있어 기존의 방식인 손으로 직접 작업을 하던 클럽활동 부서 배정 방식을 향후 교육환경의 변화 추세에 맞추어 학교 안에서 이루어지는 교육활동을, 시간적.공간적 제약을 벗어나 자유로운 공간에서 학생 임의로 클럽활동 부서를 신청, 자동 배정할 수 있도록 PHP와 MySQL을 이용하여 시스템을 구축함으로써, 학생들에게는 정보화 교육의 극대화를 꾀하였고, 교사에게는 조직.편성.운영의 시간과 경비를 줄임으로써 교수-학습의 질을 향상시킬 수 있는 방향을 제시한다.

• Journal of Korean Society of Transportation
• /
• v.21 no.6
• /
• pp.57-65
• /
• 2003

Traffic congestion on the streets is the major concern of Metropolitan areas in Korea. Especially the signalized intersections are the main spots where traffic congestion is to be created. Currently the subway construction has been on the process in Taegu Metropolitan city. The subway stations are usually located at the intersections where a large number of vehicles and people are moving. During the constructional period, such an intersection creates profoundly a great deal of traffic congestion due to the open-cut constructional method. Under circumstance of the constructional method, the lane configurations should be changed frequently and the surface conditions make drivers uncomfortable. The propose of this study is to propose the improved method of traffic operation at the large circled intersection under the construction. The Signalized Modern Roundabout(SMR) is applied modifying from the modern roundabout. The geometric design and signal operation of SMR is developed in this study. To verify the operation of SMR the comparative study is conducted between the operation of the open-cut method and SMR method using the micro-simulation program, NETSIM. The result of simulation shows that the delay caused by the operation of SMR is not higher than that under the open-cut method. SMR makes also the constructional period shorten, makes the cost of construction lessened and makes drivers more comfortable as well than the method of open-cut. Therefore, the study concludes that the operation of SMR is more efficient, economic and safer method than that of open-cut method at the large circled intersection under construction.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.43 no.2
• /
• pp.40-55
• /
• 2015

This study aims to evaluate the efficiency of the forest experience center for children led by the local community as experiential management for forest kindergarten education. For this, an importance and performance analysis was conducted on the forest experience center for children in Geumcheon-gu, which, of the 12 forest experience center for kids in Seoul, is the only one led by the local community. The questionnaire sheet for the analysis consisted of a total of 36 questions, 20 about place facility areas and 16 about management program areas(including 6 questions about the management led by the local community). The questionnaire survey was done during the period between January 12th and January 19th, 2015. The participants in the survey consisted of 15 forest education specialists and 50 teachers from 19 kindergartens who participated in the forest experience program. The number of questionnaire sheets collected and used for analysis was 13 copies and 43 copies, respectively. The mean values of importance and performance on the place facility areas were 4.07 and 3.78 for forest education specialists, and 4.16 and 3.84 for kindergarten teachers, respectively. The mean values of importance and performance regarding the management program area were 4.38 and 4.16 for forest education specialists, and 4.40 and 4.00 for kindergarten teachers, respectively. Both groups evaluated the place facility areas lower than the management program areas. They also evaluated performance lower than importance. In place facility area, 'accessibility', 'safety' and 'connectivity to forest trail', 'loose parts' and 'safety facilities' were required to 'keep up the good work', because they showed higher importance and performance in place facility areas. Even though most items of management as led by the local community including 'forest experience activity support' were evaluated as 'important', some, including 'effort for local revitalization', were evaluated as low in performance. However, as they were evaluated as higher in importance, if they pursue 'concentrate here', it is expected that they will be evaluated as higher in performance. In addition, considering that program areas including 'forest education specialist's role' are labeled under the management led by the local community, it reflected a positive evaluation. As a result, management led by the local community is efficient as a management system for the forest experience center for children in an experiential forest kindergarten education. Going forward, if this management system is durable in 'keep up the good work' and 'concentrate here', the forest experience center for children led by the local community will be an alternative for an effective experiential forest kindergarten education.

• Journal of Korean Society of Transportation
• /
• v.32 no.6
• /
• pp.579-588
• /
• 2014

In this study, three signal control strategies such as Bike box, Hook-turn, and 6-phase were assessed for various traffic conditions at signalized intersections incorporating bicycle left-turn traffic. Results showed that the size of a waiting zone mainly affected the performance of signal control in both Bike box and Hook-turn. Both Bike box and Hook-turn yielded an identical vehicle delay, but Bike box produced less bicycle delay than Hook-turn by 2.5~29.9 sec/veh for undersaturated traffic conditions. For saturated traffic condition, Bike box produced less vehicle delay than Hook-turn and 6-phase strategies, but bicycle delay was found to increase at the 700 vph of bicycle traffic compared to 6-phase. Bicycle delay was greatly increased under Hook-turn and Bike box strategies when bicycle traffic was greater than 300 vph and 500 vph, respectively. It was also shown that bicycle delay could be significantly reduced by providing appropriate size of queueing space. In addition, Bike box was likely to yield less vehicle and bicycle delay than Hook-turn for traffic volume patterns investigated in this study.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.15 no.5
• /
• pp.42-53
• /
• 2016

This study aims to evaluate the performance of Hook-turn operation with various sizes of bicycle waiting zone(WZ) and to determine the optimal size of bicycle WZ under various traffic and control circumstances. An extensive simulation study was performed to examine bicycle and vehicle delay trends for given experimental design. Results showed that vehicle delay was insensitive to the size of waiting zone, but bicycle delay was reduced as the size of waiting zone increased in general. The delay performance indicated a similar trend between with RTOR and without RTOR operation, but vehicle delay slightly increased and bicycle delay slightly decreased without RTOR. Regarding to optimal waiting zone size, 6 WZ was recommended for general conditions with RTOR, but 9 WZ was recommended when bicycle left-turn volume was greater than 120 v/h. 6 WZ was recommended for general conditions without RTOR, but 12 WZ was recommended when bicycle left-turn volume was greater than 90 v/h.

• The Bulletin of The Korean Astronomical Society
• /
• v.37 no.1
• /
• pp.52.2-52.2
• /
• 2012

1438년 장영실은 경복궁 흠경각(欽敬閣) 내부에 자동물시계인 옥루(玉漏)를 제작하였다. 흠경각루(欽敬閣漏)는 수격식(水激式, 물의 흐름을 이용하여 수차를 운행하는 동력방식)으로 운영되는 것으로 중국의 수운의상대(水運儀象臺, 1092년경 제작)의 수격방식과 유사하다. 하지만 동력 방식을 제외한 내부 구조에 대한 것은 흠경각루의 외형모습인 가산 형태, 시보인형의 구성과 배치, 작동구조 등에 의해 결정된다. 장영실은 흠경각루의 내부 기어장치의 구성과 연결 등에 대해서 새로운 제작기술을 사용하였다. 우리는 수격식 동력 방식에서 내부 공간에 따른 각각 운행 장치들의 구성과 동력전달체계에 대하여 분석하였다. 또한 수차가 일정한 회전력을 갖도록 제어하는 천형(天衡) 장치에 대하여 고찰하였다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.38C no.2
• /
• pp.172-180
• /
• 2013

In this paper, we propose an energy-efficient camera operating scheme to save energy which can be used for mass surveillance cameras. This technique determines how many cameras should be turned on in the consideration of the velocity vector of monitoring targets, which is acquired by DSRC object tracking, the model of the specification of installed cameras, and the road model of installed sites. Also, we address other techniques used to save energy for the surveillance system as well. Throughout performance evaluation, we demonstrate the excellence of our proposed scheme compared with previous approaches.

• 한국공간정보시스템학회:학술대회논문집
• /
• 2005.11a
• /
• pp.113-120
• /
• 2005

최근의 정보통신기술의 급격한 발전으로 인해 향후 도시를 건설할 때 도시운영 및 관리뿐만 아니라 도시민들이 향유할 각종 서비스에 정보통신기술 변화를 반영하여야 할 것이다. 행정중심복합도시를 건설하기 위해서도 이러한 정보기술의 변화를 전망하고, 이를 구현하기 위한 추진방안이 모색되어야 한다. 행정중심복합도시는 과거의 전형적인 도시개발방식에서 탈피하고, 새로운 방식과 모델을 도입하여 21세기의 모범적인 도시를 건설하는 것이 필요하다. 그리고 IT의 비약적인 발전에 따라 도시의 물리적 거리와 시간에 구애받지 않고 무한한 정보를 매체로 새로운 도시공간으로 구현되어야 한다. 또한 이러한 정보기술의 발전을 통해 행정중심복합도시의 가치를 높이고 새로운 비즈니스 기회를 창출할 필요가 있다. 이를 위해 본 연구에서는 u-행복도시의 비전을 '사람과 자연과 기술이 하나되는 세계제일의 지능정보도시'로 정의하고 이러한 비전을 토대로 행적 효율과 시민 편익이 제고되는 전자 행정중심 도시, 자연과 인간이 함께 하는 지능형 환경 도시, 시민 안전을 도모하는 첨단정보관리 도시, 사람과 사물이 연결되는 정보 네트워크 도시에 대한 구현방안을 모색하였다.