• 한국지반환경공학회 논문집
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• 제22권11호
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• pp.23-29
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• 2021

최근 도심지를 중심으로 지반함몰이 꾸준하게 발생되고 있어 시민들의 안전을 위협하고 있다. 도로 하부에는 상수관로, 하수도관로, 통신관로 등 각종 지하 시설물이 매설되어 있다. 이러한 지하시설물의 노후화와 지하 난개발로 인해 지반함몰의 원인으로 작용하고 있다. 기존 관로의 노후도에 따라 지반함몰 발생 위험도를 분석된 결과가 있지만 지반 교란상태를 나타내는 관로의 밀집도를 활용한 지반 함몰 위험도를 분석한 결과는 없는 실정이다. 따라서, 본 연구에서는 서울시의 대표 지하 관로 6종 데이터를 활용하여 지하공간의 밀집도를 분석하여 지반함몰과 상관성이 있는지에 대한 연구를 수행하였다. 그 결과 지반함몰 발생 지역에서는 지하 시설물의 밀집도가 높은 것으로 나타나 지반함몰에 관로의 밀집도가 영향을 미치는 것을 알 수 있었다.

• 융합신호처리학회논문지
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• 제7권3호
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• pp.143-148
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• 2006

정수장에서 생산한 수돗물이 수용가까지 안전하게 공급하기 위해서는 관내 및 배수지 등의 공급과정에서 철저한 수질관 리가 필요하다. 그러나 배수지의 수질관리 및 모니터링이 전혀 이루어지지 않고 있다. 최근 정부는 먹는 물에 대한 수질관리기준을 강화하고 있으나, 먹는 물에 대한 수질측정 기반기술은 미국, 일본, 독일 등에 비하여 매우 빈약하다. 특히 수질 검사 및 분석기기의 핵심은 센서이나 이들 센서에 대한 기술이 매우 부족하다. 본 논문에서는 국내 먹는 물 수질관리에 대한 관계 법령 및 규정을 분석하고, 먹는 물 수질측정 기준에 적합한 pH, 전도도, 잔류염소, 탁도 및 수온에 대한 센서 및 측정기기의 최적 성능기준을 제안하고, 대표적인 전극센서인 pH, 전도도 및 잔류염소 센서의 상호간섭 및 영향을 분석한다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 춘계학술발표대회 논문집
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• pp.179-184
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• 2011

The development of new energy has attracted consideration attention due to the high oil price and environmental problems. In advanced country, they have tried to carry out a long range plan for energy. We need to develop new energy for Low Carbon Green Growth in Korea. The building is 30% among ratio of energy consumption in Korea. And in the past, heating energy was high ratio for energy using at home. But recently, the demand for cooling energy keeps growing due to rising average temperature on the earth and improvement of life quality. In this situation, the energy of lake water and ocean water has studied to utilize in advanced country because of low temperature at underwater. But the study for deep water is still a lot left to do. In this study, we analyzed district cooling system and the present condition. Analyzing the deep lake water cooling system in Toronto, we found an application of district cooling system using deep ocean water. Deep lake water uses heat source for district cooling and water source for city in Toronto. So reducing the initial cost, this city had economic effect. When DLWC was applied at existing building, the heat exchanger was installed instead of cooling tower and refrigerator. And the heat exchanger used to connect main pipe with cool water on city. System using deep ocean water can be applied as a similar way to supply cool water from lake to building.

• 한국측량학회지
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• 제39권6호
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• pp.497-505
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• 2021

최근 국내에서 빈번하게 발생하는 지하공간 사고에 기인하여 정부에서는 지하공간 안전관리 대책으로 지하공간통합지도(IUGIM: Integrated Underground Geospatial Information Map) 구축의 기본 계획을 2015년에 수립하여 2021년 현재 부분 구축이 완료된 상태이고, 지하공간 관리 주체 및 관계 기관 등이 활용 중이다. 본 연구는 지하공간통합지도의 활용성 향상 방안의 일환으로 수행 중이며, 현장에서 계측된 실시간 기반의 데이터와 지하공간통합지도 내에 저장되어 운용 중인 보관 데이터의 비교 작업을 수행하기 위한 가시화시스템을 구축하는 내용을 다룬다. 지하공간통합지도에 구축되어 관리되고 있는 시추공 데이터 및 지하시설물 6종에 대한 가시화 기능을 탑재한 시스템을 구축하였다. 지하시설물 6종은 상수도관, 하수도관, 전력관, 가스관, 통신관 및 난방관이다. 구축 완료된 시스템은 서울시 강남구, 서초구 일원 3지점에 대한 현장 실증을 수행하였다. 현장 실증은 모바일센터에 접속해서 지하공간통합지도 데이터 내려받기, 지하공간통합지도 데이터(지표면 생성, 시추정보, 지하시설물) 가시화 작업, 현장에서 취득한 GPR(Ground Penetrating Radar) 기반 데이터에 대한 가시화 등으로 진행하였다. 지하공간통합지도 데이터 및 GPR 기반 현장 데이터의 실증 결과 적합한 것으로 판정되었다. 본 연구의 결과로 굴착 현장에서 안전한 시공에 도움이 될 수 있을 것으로 판단된다.

• 한국음향학회지
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• 제9권4호
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• pp.45-54
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• 1990

급 배수 설비소음은 공동주택 내부소음의 설문조사 결과, 상하층간 바닥충격음과 함께 거주자에게 두드러진 불만요소로써 나타나고 있다. 본 연구에서는 이러한 공동주택 급배수 설비소음의 실태를 측정하고 실태조사와 급수관의 고체전달음 및 배수음의 저감 모델 실험 결과를 중심으로 급배수 설비소음에 관한 공법상의 저감방안을 제시하였다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.191-196
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• 2001

In the systems with largely pipe head loss, variable speed pumps are generally used because substantial energy saving can be expected from such systems by controlling pump speed and also they offer simpler maintenance and operational ease even in conditions where abrupt changes In flow rate and head can occur. The invertor or the fluid coupling system are mainly adopted to control the rotating speed. In this paper, operating conditions at Migum pressing pump station(5 stage), where the fluid coupling system was the first installed for KOWACO, are investigated and analysed so that information thus gained can be usefully employed in the efficient operation of variable speed pump in new installations of in-line booster pumping station.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.626-629
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• 2008

Numerical predictions on flow phenomena in pipe network systems have been considered as playing an important role in both designing and operating various facilities of piping or duct systems, such as water supply, tunnel or mine ventilation, hydraulic systems of automobile or aircraft, and etc. Traditionally, coupling conditions between junction and connected branches are assumed to satisfy conservation law of mass and to share an equal pressure at junction node. However, the conventional methodology cannot reflect momentum interactions between pipes sufficiently. Thus, a new finite volume junction treatment is proposed both to reflect the interchanges of linear momentums between neighbor branches at junction and to include the effect of wall at junction in present work.

• 상하수도학회지
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• 제30권5호
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• pp.587-596
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• 2016

This study attempts to draw factors for an analysis of the operation effect of a rechlorination facility and autodrain equipment for residual chlorine equalization by installing and operating a rechlorination facility and autodrain equipment in P City and analyzing the practical evaluation method and operation effect. For this purpose, this study selected three indicators for an analysis of the effectiveness of residual chlorine equalization and conducted a comparative analysis before and after the implementation of the residual chlorine equalization. As a result of estimation, (1) the reduction of the residual chlorine concentration range from a water treatment plant to the pipe end was 16.0%; (2) the total reduction of chlorination input was 18.0%; and (3) the reduction of the generation of disinfection by-products was 19.5%. In addition, this achieved enough residual chlorine equalization in the supply process and shows that it could successfully achieve the economic feasibility of investment in equipment and the reduction of the generation of disinfection by-products. Like this, it is judged that the three indicators suggested in this study will be used sufficiently as indicators of an analysis of the effectiveness of residual chlorine equalization according to the operations of the rechlorination facility and autodrain equipment.

• 한국주거학회논문집
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• 제17권4호
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• pp.65-72
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• 2006

Most of buildings have been deteriorated with time-elapse by reflection of the building location, material, environmental circumstances and so on. The performance would go down and be demolished if anything could not be done after constructed. The maintenance should be required to preserve a decent living condition or improve a inferior condition by various plans and practices. The maintenance plan needs various data such as a repair scope, a repair time, a forecasted cost, a plan of management and so forth. Among the above required data for planning the maintenance, the deterioration characteristics of the building components would be first analyzed. The deterioration pattern would be a key role to affect and make a maintenance plan. In this paper, it aimed at classifying the deterioration patterns of building components. A deterioration pattern would be analyzed between the cumulative repair cost and time-elapse and modeled with these relations. A deterioration patterns are classified into 4 types-a accelerated type, a straight type, a temporary type and a slowly type. As a result of this research, a accelerated type includes window, window frame, general paintings, general water proofing in building components. A straight type includes the lacquer paintings, furnishings in building components and water supply pipe, boiler, sanitaries in mechanical facilities and lighting in electric facilities. Based on these research results, further study should be conducted to include any other components and an estimating model.

• 한국전기전자재료학회논문지
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• 제14권9호
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• pp.707-713
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• 2001

As the integrated circuit device shrinks to smaller dimensions, chemical mechanical polishing (CMP) process was requirdfo the global planarization of inter-metal dielectric (IMD) layer with free-defect. However, as the IMD layer gest thinner, micro-scratches are becoming as major defects. However, as the IMD layer gets thinner, micro-scratches are becoming as major defects. Micro-scratches are generated by agglomerated slurry, solidified and attached slurry in pipe line of slurry supply system. To prevent agglomerated slurry particle from inflow, we installed 0.5${\mu}{\textrm}{m}$ point of use (POU) filter, which is depth-type filter and has 80% filtering efficiency for the 1.0${\mu}{\textrm}{m}$ size particle. In this paper, we studied the relationship between defect generation and polished wafer counts to understand the exact efficiency fo the slurry filteration, and to find out the appropriate pad usage. Our experimental results showed that it sis impossible to prevent defect-causing particles perfectly through the depth-type filter. Thus, we suggest that it is necessary to optimize the slurry flow rate, and to install the high spray bar of de-ionized water (DIW) with high pressure, to overcome the weak-point of depth type filter.