• Journal of the Korean Geosynthetics Society
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• v.23 no.2
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• pp.63-75
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• 2024

Drinking water is an essential element to ensure the basic human right to live, and the quality of clean water must always be ensured. However, domestic water facilities, which were installed intensively in the early 2000s, are deteriorating. The accidents such as discoloration of water such as chromaticity and turbidity as well as leakage of substances frequently occur. However, since it is virtually impossible to replace all water pipes, the detailed standards for maintenance of water pipe network facilities established in 2021 require water pipe cleaning. The swab pig method, one of the water pipe cleaning methods, is a method of physically removing substances in pipes and is evaluated as having the highest cleaning efficiency. However, Swab is highly likely to be damaged or deformed during the cleaning process, and may even be lost. Therefore, in this study, the material of the pig was changed to a material with high compressibility, and it was made as close as possible to the inner wall of the water pipe. And, to maximize cleaning efficiency, a rotation swab pig with a rotation blade was developed. In addition, high-strength wire and winding equipment were additionally developed to eliminate the possibility of loss and to determine the location of the pig. The inlet and outlet are connected with wires, and after verifying the performance of each detailed technology, the technology was applied on a test bed with a 30m section. As a result of the application, the performance of the technology was verified by measuring the process time and evaluating applicability.

• Journal of Cadastre & Land InformatiX
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• v.45 no.2
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• pp.131-147
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• 2015

In modern society, as to the underground urban infrastructure facilities(communication electricity water and sewage gas etc.) were contained many risks because of excavating. The exact position of underground facilities and the attribute information should be built in order to prevent accidents. As the result of analyzing the public surveying results from 2004 to 2009, it shows that low detecting rate of water pipeline which is only 52.4%, because the exploration of electromagnetic induction only detect metal pipeline and positioning survey only detect new pipeline before burying. Therefore development and verification of the correct and efficient exploration techniques are needed to improve the detecting rate. In this study, determined based on the location measurement results for the non-metal pipes and metal pipes before burial. It was compared with values that obtained through the ground penetrating radar and electromagnetic induction detecting. As a result, detecting rate of the concrete section showed a 100%, unpaved section showed a 94.7%, asphalt section showed 60%. So it confirmed the applicability of the ground penetrating radar at underground facilities detecting.

• Composites Research
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• v.22 no.3
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• pp.1-8
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• 2009

In this paper, we present the results of experimental and analytical investigations on the structural behavior of GFRP pipes used in the water supply pipeline system. Cross-section of the pipe is consisted with two GFRP tubes and polymer mortar between the tubes. Due to the advantages such as light-weight, corrosion resistance, smooth surface, flexibility, etc., use of GFRP pipe in the water supply pipeline system is ever increasing trend. Therefore, more optimized structural design methodology should be developed. In the investigation, we conducted theoretical and analytical studies on the load versus radial deformation characteristics of GFRP pipes. In addition, ring stiffness test is also performed. Test results are compared with theoretical and analytical results and it was found that the results are agreed well within 5% of radial deformation. Finally, it was also found that the GFRP pipes used in the water supply pipeline system are strong enough to satisfy the industrial requirements.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2015_2016
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• 2009

전기방식이 실시되고 있는 상수도 관로는 관의 노후화, 코팅의 열화, 부적절한 방식시스템의 적용 및 타 시설물과의 간섭 등으로 부분적으로 방식전위 미달구간이 존재한다. 이러한 방식전위 미달구간에 대하여 토양환경 측정 및 방식소요전류량 산정, 간섭 시험 등을 통하여 토양환경은 부식이 '발생하는 구간' 및 '미약하게 발생'하는 구간으로 나타났다. 임시 가통전 시험을 통하여 방식소요전류량을 구할 수 있었다. 간섭영향 시험으로 간섭 여부 및 전식 발생지점을 추정할 수 있다. 현장 측정 결과와 설계기준을 바탕으로 적절한 전기방식 보강 계획을 수립하여 현장에 부분적으로 설치하였으며 방식상태를 분석하였다. 단순히 설계된 소요전류량만을 증가시키는 방안보다 부분적인 방식보강 및 주변 배관 상태를 고려하여 적절한 통합 방식방안을 적용하는 것이 더 효율적인 것으로 나타났다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.12 no.2
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• pp.187-197
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• 1994

The purpose of this study is to develop a PC-based water supply facilities information system. This system will be a major stepping-stone for developing Geographic Information Systems(GIS) in Korea, which is constructed by integrating the technologies related to Automated Mapping(AM) systems and Facilities Management(FM) system. And the results of this study are as follows: (1) After the user needs assessment, it was decided that information management of the water supply facilities including distribution pipes, valves, and leaking management are the most urgent tasks. So, the system was developed focusing on these tasks. (2) After the system design and development, the water supply facilities information system consists of graphic database management system, attribute database management system, internal interface that links graphic data and attribute data, and graphic user interface for user-friendliness. (3) The graphic data and the attribute data including distribution pipes, leading-pipes, valves, and parcels at the study area, Non-Hyun Dong Kang-Nam Gu in Seoul, were used in this system, and the water supply facilities database was established. It was applied to test these facilities, and proved that the system developed in this study is efficient to manage information within the scope of this study. (4) The function using the parcel identification number was efficient to locate the address concerned.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.2
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• pp.296-301
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• 2021

GPR is used for non-destructive investigations, ground investigations, and underground facilities exploration at construction sites. In this study, the applicability to GPR exploration of water pipes linked to Network RTK was presented. Data on the water supply pipes in the study site were acquired using GPR, and the location and depth of buried water pipes could be measured. The accuracy was evaluated from the GNSS observation performance and showed a deviation of -0.16m ~ 0.15m. This satisfied the equipment performance of the public survey work regulation, suggesting that the exploration of water pipes using GPR is possible. Because GPR does not require grounding installation, as in conventional metal pipe detectors, it will increase the efficiency of work for underground facility exploration. Exploration using GPR can acquire the location and depth of metallic and non-metallic underground facilities, so it can be utilized in the construction of a GIS system. If a comparison of the exploration characteristics is carried out, it will be possible to present various uses of underground facility exploration using GPR.

• Journal of Korea Water Resources Association
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• v.55 no.spc1
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• pp.1197-1210
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• 2022

Recently, users' complaints on drinking water quality are increasing according to emerging interest in the drinking water service issues such as pipe aging and various water quality accidents. In the case of drinking water quality complaints, not only the water pollution but also the inconvenience on the chlorine residual for disinfection are included, thus various efforts, such as rechlorination treatment, are being attempted in order to keep the chlorine concentration supplied evenly. In this research, for a more accurate water quality simulation of water distribution network, the water quality reaction coefficients were estimated, and an optimization method of chlorination/ rechlorination scheduling was proposed consideirng satisfaction of water quality standards and chlorine residual equalization. The proposed method was applied to a large-scale real water network, and various chlorination schemes were comparatively analyzed through the grid search algorithm and optimized based on the suitability and uniformity of supplied chlorine residual concentration.

• Journal of Korean Society of Water and Wastewater
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• v.27 no.3
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• pp.395-404
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• 2013

The risk of pipe-bursting in multi-regional transmission mains consisting of 89 % of singled pipeline is so high that pipeline stabilization project is required such as renewal and replacement, pipe paralleling, emergency ties. Pipeline stabilization projects could be postponed at the step of initial decision-making because effect of this project is intangible benefit like activation of economic, improvement of welfare related to water. This study is to suggest quantified economical feasibility model for intangible benefit presumption to solve above problem. Cost reduction of emergency water supply, leakage, burst restore and energy efficiency improvement was altered and applied. As a result of economic analysis taking into account estimated benefit and cost under discount rate 5.5 %, service life 40 years, sufficient economic feasibility analyzed with B/C 2.45, NPV 317,700 million won, IRR 9.09 %.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.395-395
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• 2022

본 연구는 머신러닝 기반의 상수도 모니터링 시스템의 예측 모델을 개발하고, 예측 모델의 적용이 가능성을 검토하였다. 상수도모니터링 시스템은 상수관망에 설치된 센서에서 수집된 자료를 모니터링 할 수 있어 운영자의 상수도 시설물의 관리 편의성을 높일 수 있다. 특히 수리학적 모델을 적용하여 계산된 값과 측정된 값을 비교해 이상치가 발생하면 운영자에게 이를 알려주므로 시스템내의 문제점을 빠르게 확인할 수 있다. 그러나 수리학적 모델은 입력자료가 증가됨에 따라 계산시간이 많이 소요되는 문제가 있고, 계산된 값의 정확도가 낮아지므로. 이러한 문제를 보완하기 위해 머신러닝 기반의 예측 모델을 개발하여 이를 해결하고자 하였다. 예측 모델은 GS 이니마 브라질(GS Inima Brazil)에서 운영중인 아라사투바(Aracatuba) 지역 주사라(Jussara) DMA(District Metered Area)의 2018년 1월에서 7월까지의 운영자료를 이용하였으며, 상수도 모니터링 시스템에서 상수관로 수압에 영향을 미치는 영향 인자들을 분석하고, 하이퍼파라미터 최적화를 통한 수압 예측 모델을 개선하였다. 금회 연구는 머신러닝 기반의 모델을 통하여 상수관망의 시간변화에 따른 장래 예측 수압을 검토할 수 있었다는데 큰 의의가 있다.

• The Journal of Korean Philosophical History
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• no.43
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• pp.267-293
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• 2014

This paper is aimed at analyzing the characteristics of Image-Meaning theory focused on image in the early days of the Joseon Dynasty and SongMing period. Zhouyi' theory in the early days of the Joseon Dynasty was constructed on the basis of Zhouyi' theory of SongMing period. The characteristics of Image-Meaning theory in the early days of the Joseon Dynasty can be explained largely by two routes. One is the perspective of critical succession on Zhouyi'theory of focusing on meaning that led Chengyi(程?) and Yangwanli(楊萬裏). As the representative of this route, Gwongeun and Toegye not only asserted Image-meaning theory focused on meaning, but also developed a perspective of taking all the image and meaning. The other is the active succession and creative transformation about Image-Meaning theory of Tushuxue that led Chentuan(陳?) and Shaoyong(邵雍). As the representative of that route, Yulgok and Yeohun explained the schematic diagram of the universe of the universe by using methodology of Tushuxue. Furthermore, they actively succeed Shaoyong' Zhouyi theory to expand Image-Meaning theory focused on number. In addition, Cho, Haoyi(曺好益)described the propositions - "meaning is not out of image area, image equipped with meaning all, then there is no law of limitation in image adopted theory. Those propositions are opposed to Chengyi(程?) and Zhuxi(朱熹)' ZhouYi' theory.