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NoSQL 데이터베이스를 사용한 도로 교통 데이터 질의 처리 시스템의 구현
Titus Irma Damaiyanti,Ardi Imawan,권준호,최윤호 한국정보과학회 2015 데이타베이스 연구 Vol.31 No.2
ITS (Intelligent transport system) offers a wide range of traffic information and services by integrating the IT-related high technology with transportation and facilities. By collecting road traffic data from various data sources such as road sensors and mobile phones, an ITS monitors the current road status of the urban area. However, when huge volumes of traffic data are collected, it is not efficient for a user to query road traffic data for finding similar traffic situation. To overcome this limitation, in this paper we propose a road traffic data query system which uses the MapReduce functionalities of NoSQL database. Raw road traffic data are converted into traffic matrices and stored into a MongoDB document database. Also, by computing a singluar value decomposition (SVD) from transformed traffic matrices and using the SVD, it is possible to query the road traffic data efficiently. We evaluate the efficiency of the proposed system by using the real road traffic data obtained from Busan metropolitan city. 지능형 교통 체계(ITS)는 교통 수단과 시설에 IT관련 첨단 기술을 접목하여 다양한 교통 정보 및 서비스를 제공한다. 도로 센서와 스마트 폰과 같은 다양한 데이터 소스로부터 도로 교통량 데이터를 수집하여, ITS는 도시 지역의 현재 교통 체계를 모니터한다. 하지만, 대용량의 교통 데이터가 수집될때, 사용자가 유사한 교통 상황을 찾기 위해서 교통 데이터를 대상으로 질의하는 것은 효율적이지 않다. 이를 극복하기 위하여 이 논문에서 NoSQL 데이터베이스의 MapReduce 기능을 이용하는 도로교통 데이터 질의 시스템을 제안한다. 제안된 시스템에서 원본 교통량 데이터는 행렬로 변환되어 MongoDB 문서 데이터베이스에 저장되고 이 행렬로부터 계산된 singular value decomposition (SVD)를 이용함으로써 효율적인 교통량 질의를 처리하는 것이 가능하다. 부산시로부터 제공받은 실제 데이터를 사용하여 제안하는 시스템의 효율성을 평가하였다.
Mukhsinun Hadi Kusuma,Nandy Putra,Anhar Riza Antariksawan,Susyadi,Ficky Augusta Imawan 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
The decay heat that is produced by nuclear reactor spent fuel must be cooled in a spent fuelstorage pool. A wickless heat pipe or a vertical two-phase closed thermosyphon (TPCT) isused to remove this decay heat. The objective of this research is to investigate the thermalperformance of a prototype model for a large-scale vertical TPCT as a passive coolingsystem for a nuclear research reactor spent fuel storage pool. An experimental investigationand numerical simulation using RELAP5/MOD 3.2 were used to investigate the TPCTthermal performance. The effects of the initial pressure, filling ratio, and heat load wereanalyzed. Demineralized water was used as the TPCT working fluid. The cooled water wascirculated in the water jacket as a cooling system. The experimental results show that thebest thermal performance was obtained at a thermal resistance of 0.22℃/W, the lowestinitial pressure, a filling ratio of 60%, and a high evaporator heat load. The simulationmodel that was experimentally validated showed a pattern and trend line similar to thoseof the experiment and can be used to predict the heat transfer phenomena of TPCT withvarying inputs.