• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1791-1796
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• 2005

Semi-shield tunneling is one of the propulsion construction methods used to lay pipes underground between two pits named 'entrance' and 'destination', respectively. Usually a simple composition, such as 'a fiducial target at the entrance+a total station (TS)+a target on the machine', is used to confirm the planned course. However, unavoidable curved sections are present in small-sized pipe lines, which are laid after implementation of a road system, for public works such as waterworks, sewer, electrical power, and gas and communication networks. Therefore, if the planned course has a curved section, it is difficult to survey the course with the abovementioned simple composition. This difficulty could be solved by using the multiple total stations (MTS), which attaches the cross type linear LED target to oneself. The MTS are disposed to where each TS can detect the LED target at the other TS or the base point or the machine. And the accurate relative positions between each MTS and target are calculated from measured data. This research proposes the relative and absolute coordinate calculation algorithm by using three MTS to measure a curved course with 20m curvature at 30m maximum distance, and verifies the algorithm experimentally.

• 한국게임학회 논문지
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• 제20권4호
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• pp.3-10
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• 2020

본 연구의 목적은 기존 방역시스템의 한계를 극복하기 위한 게임 기반 방역 프레임워크 설계이다. 최근 서울에서 발생한 바퀴벌레 범람 사태와 같이 바퀴벌레의 뚜렷한 출현 패턴을 파악하기 어려워지면서 기존 방역체계의 한계가 빈번하게 발생하고 있다. 특히 도시개발에서 필수적인 시설로 여겨지는 공공하수도 시설은 도시 난개발로 인해 체계적 방역사업을 진행하기 어렵다는 문제에 직면해 있다. 이러한 도시의 문제를 해결하기 위해 본 연구에서는 공공방역 설계에 게임을 접목함으로써 시민참여를 통한 집단지성을 구축하고, 바퀴벌레 방역의 대안을 도출할 수 있는 게임 기반 방역 프레임워크를 제안한다.

• 한국물환경학회지
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• 제21권6호
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• pp.682-686
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• 2005

Recently some urban areas have been flooded due to heavy storm rainfalls. Though major causes of these floodings may be attributed to localized heavy rainfalls, other factors are related to urban flooding including deficiency of storm sewer network capacity, change of surface runoff due to covered open channels, and operational problems of storm drainage pump stations. In this study, hydrologic and hydraulic analysis of Sutak basin in Guri city were carried out to evaluate flooding problems occurred during the heavy storm in July, 2001. ArcView, a world most widely used GIS tool, was used to extract required data for the hydrologic analysis including basin characteristics data, concentration times, channel routing data, land use data, soil distribution data and SCS runoff curve number generation from digital maps. HEC-HMS, a GIS-based runoff simulation model, was successfully used to simulate the flood inflow hydrograph to Sutak pumping station.

• 상하수도학회지
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• 제20권4호
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• pp.573-584
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• 2006

This study was carried out to investigate the causes of fish kills in the Yudeung Stream in Daejeon, Korea using literature reviews, governmental and our water quality monitoring data of the study site, rainfall data, intensive water quality monitoring during rainfall events, sediment pollutant contents and laboratory bioassay tests. Fish kill in urban streams can be caused by combined effect of reduction in dissolved oxygen concentration, increase in toxic material or increase in turbidity in waterbody due to introduction of surface runoff or effluent of combined sewer overflows after rainfall from the watershed areas. Despite of extensive and intensive field surveys and laboratory tests, it was found that those conventional methods have limitations to identify causes of fish kills in urban streams. It would be necessary to use dynamic water quality modeling to predetermine the range and level of water pollution in the stream and automatic water quality monitoring system that can collect water samples and detect water quality continuously.

• 농촌지도와개발
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• 제23권4호
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• pp.361-374
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• 2016

This study examined the regulation status on wastewater treatment in agro-food processing and a case study on effluent treatment m ethods was carried out to evaluate any change after the mitigation of regulation. First, in order to clarify the area of investigation, the definition of small-scale agro-processing facilities was reviewed through literature survey and local government ordinance. The current law were separately analyzed into four areas; effluent treatment facilities, development of agro-processing industries, land use and food processes equipment. The exclusion clauses on wastewater discharging facility in the enforcement regulation were defined in detail, which can be served in practice. Site survey, after the questionnaire survey of the person in charge of the local unit, was carried out. As the result, this survey confirmed the positive effects of the deregulation on promoting sewer system service in rural areas, introducing the new processing construction and so on. In addition, it was found that some matters to be considered to determine whether to introduce wastewater treatment plan for public food processing facilities.

• 한국농공학회논문집
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• 제51권3호
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• pp.9-14
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• 2009

Flow and pollution load were monitored at 2 combined sewer outlets (C-1 and C-2) of urban watersheds during dry weather from September, 2004 to April, 2006 for 20 months. The objectives were to investigate the diurnal variation of flow and pollutant load and to find the proper sampling time that could measure representative flow and pollutant load. Pollution load closed to the average daily load at C-1 could be measured at 00:00 hour and by the mean of 15:00 and 18:00 hour measures, and 15:00 and 21:00 hour measures, respectively. In addition at C-2, it was 21:00 hour and the mean of 15:00 and 18:00 hour measures. This study concluded that arbitrary sampling of flow and water quality could cause large errors in the estimation of urban pollution load and recommended that urban combined sewers should be monitored when flow and water quality showed daily average and concentration.

• 한국물환경학회지
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• 제22권1호
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• pp.91-96
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• 2006

Many small scale Sewage Treatment Plants (STPs) are currently being constructed at many rural areas. The STPs in rural area suffer from low concentration and large inflow quantity fluctuation during wet weather mainly due to illicit combined sewer system. Sequencing Batch Reactor (SBR) is a process effectively coping with these obstacles. The main objective of this study was to evaluate SBR with high hydraulic loading and low inflow concentration. The operating conditions tested were: organic loading rate = $0.17-0.42KgBOD/m^3/d$, hydraulic loadings = $12.1-61.5m^3/m^2/d$, average MLSS concentration = 2500 mg/L, F/M ratio = 0.026-0.17 KgBOD/Kg MLSS, HRT = 9-12 hr HRT, and SRT = 5.6-33.6 days. Organic loading rate on SBR did not impact significantly on BOD and SS removal efficiencies. To increase treatment efficiencies, low hydraulic loading rate with low concentration was required. The results suggested that low influent concentration with high inflow rates during wet weather requires extended time for settling.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2008년도 공동춘계학술대회
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• pp.217-226
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• 2008

최근 들어 U-City 구축 사업을 수행하고 있는 대다수의 지자체에서는 U-City건설지원법에서 규정하고 있는 U-도시기반시설의 서비스 모델을 정립하고 체계화 하기위해 노력하고 있다. 그 중 공간정보 수요가 높은 도로, 상 하수도 시설물은 국토해양부의 주관하에 90년말부터 현재까지 매칭펀드 사업을 통해 DB 및 시스템을 구축하도록 유도해 왔다. 그러나 정부차원의 이러한 사업이 지자체 지리정보 담당부서와 지하시설물 관리 담당 공무원들 중심으로 단순히 공간정보의 조회 및 편집차원에서 추진되고 있어 활용에 대한 한계가 발생하고 있다. 본 연구는 국토해양부에서 주관하고 있는 '지능형 도시 지하시설물 관리 기술 개발' R&D 사업을 통해 이러한 한계를 극복하고 기존 상 하수도 단위시스템에서 제공하는 조회 및 편집기능이외에도 USN 및 RFID를 적용하여 활용할 수 있는 지능화된 지하시설물 관리업무를 도출하고, 기존 상 하수도 단위시스템과의 연계 모델을 제시하고자 한다.

• 한국산학기술학회논문지
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• 제8권1호
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• pp.65-72
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• 2007

본 논문은 단국대학교의 e-learning 서버의 부하 분석을 통해 교육용 서버의 통계적 부하 모델 작성을 위한 기초 자료 제공을 목적으로 한다. 분석 결과로 파일의 크기 분포, 파일 유형별 접속 빈도와 전송량, 접근 간격, 선호도 변화, 네트워크별 접근 비율 등을 제시하였다. 특히, 동영상 파일의 크기 분포와 접근 빈도별 파일 분포는 이전의 연구들과는 다른 결과가 나타났다. 이것은 동영상 강의를 제작하기 위해 저작 도구를 사용하고 수강생 수의 제약이 없는 온라인 교육의 특성이 반영되었기 때문이다. 본 논문에서 제시된 분석 결과는 e-learning 시스템 구조와 서버 성능 향상을 위한 연구에 기초 자료로 이용될 수 있다.

• 정보처리학회논문지D
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• 제12D권5호
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• pp.765-772
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• 2005

XML 웹 서비스를 하기 위해서 개발자는 사용자를 위한 클라이언트 프로그램과 서버 프로그램을 함께 개발하여야 한다. 최근 사용자들의 요구와 기대의 증가, 그리고 사회적인 기호와 트렌드 변화 등 내부 ?외부적인 변화가 자주 발생되고 있는 상황에서, 프로그램의 구조 변경이 자주 발생하게 된다. 따라서 XML을 기반으로 한 웹 프로그램 개발의 시간과 비용을 줄이기 위해 웹 프로그래밍을 위한 자동 생성 도구의 개발이 필요하게 된다. 본 연구에서는 개발 지원 서버의 통해 개발자가 XML 스키마, XML 스타일시트 그리고 XML 문서를 쉽고 빠르게 생성하기 위한 정보를 제공할 수 있는 웹 기반의 XML Tree를 설계하고 구현하는 방법을 제시한다.