• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.295-304
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• 2010

Performance of a landfill liner is evaluated based on leakage rate and mass flux. In this study, the recently utilized double composite liner system, which consists of a geomembrane (GM), a geosynthetic clay liner (GCL), a GM, and a compacted clay layer (61 or 91.5 cm) is compared with other popular composite liners including the single GCL system, the Subtitle D liner system, and the Wisconsin NR500 liner system. The leakage rate through circular and long defects in the GM of the landfill liners is analyzed using numerical models. For the mass flux criterion, the analyses of inorganic contaminant transport through defects in the GM component of liner systems and diffusion of organic compounds through intact landfill liners are conducted using three- and one-dimensional numerical models, respectively. Cadmium and toluene are used in the analyses as a typical inorganic and organic substance, respectively, which will be chemical species encountered during landfill operation. The comparison shows that the double composite liner systems are superior to the other liner systems according to the performance-based evaluation.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.245-254
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• 2009

Efficiency of landfill liners system is usually evaluated based on leakage rate and mass flux. In this study, composite liner systems including the GCL(geosynthetic clay liner) composite liner, the Subtitle D liner, the Wisconsin NR500 liner, and the recently utilized double composite liner, which is a combination of the GCL composite liner and Subtitle D-type liner, have been examined. The leakage rate through circular and long defects in the geomembrane (GM) of the liner system was analyzed with the aids of analytical and numerical methods. For the mass flux criterion, contaminant transport through defects in the GM of landfill liners can be evaluated based on the calculated leakage rates. The diffusion rate of volatile organic compounds through intact landfill liners was evaluated by performing a one-dimensional numerical model. Cadmium and toluene were adoptted in the analyses as typical inorganic and organic substances, respectively, which will be chemical species encountered during landfill operation. The performance-based evaluation indicates that the double composite liner systems are superior to the other types of liner.

• 유기물자원화
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• 제15권3호
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• pp.90-96
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• 2007

폐기물 관리시설 중 하나인 폐기물매립지는 유해성분을 함유한 침출수와 가스로부터 발생되는 위생문제와 환경오염 방지를 위해 필요한 시설이며 이중에서 바닥차수층은 가스포집층과 더불어 반드시 설치되어져야 히는 공종이다. 매립된 폐기물에서 발생된 오염된 침출수는 지하수를 오염시키기 때문에 바닥치차수층은 내구성과 함께 $1{\times}10^{-7}cm/sec$ 이하의 저투수성을 확보해야만 한다. 본 고에서는 강원도 P군 폐기물 종합처리시설 중 "복합차수층 조성기술" 이 적용된 매립시설의 바닥차수층 공종과 관련하여 현장시공과정 상의 시험내용 및 품질관리 사항들을 요약, 정리하여 개발기술의 현장적용 사례를 소개하고자 한다.

• 대한기계학회논문집A
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• 제33권6호
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• pp.614-619
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• 2009

An engine for marine propulsion and power generation consists of several cylinder liner-piston sets. And the oil groove is on the cylinder liner inside wall for the lubrication between a piston and cylinder. The machining process of oil groove has been carried by manual work so far, because of the diversity of the shape. Recently, we developed an automatic grinding robot system for oil groove machining of engine cylinder liners. It can covers various types of oil grooves and adjust its position by itself. The grinding robot system consists of a robot, a machining tool head, sensors and a control system. The robot automatically recognizes the cylinder liner's inside configuration by using a laser displacement sensor and a vision sensor after the cylinder liner is placed on a set-up equipment.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1075-1080
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• 2008

An engine for marine propulsion and power generation consists of several cylinder liner-piston sets. And the oil groove is on the cylinder liner inside wall for the lubrication between a piston and cylinder. The machining process of oil groove has been carried by manual work so far, because of the diversity of the shape. Recently, we developed an automatic grinding robot system for oil groove machining of engine cylinder liners. It can covers various types of oil grooves and adjust its position by itself. The grinding robot system consists of a robot, a machining tool head, sensors and a control system. The robot automatically recognizes the cylinder liner's inside configuration by using a laser displacement sensor and a vision sensor after the cylinder liner is placed on a set-up equipment.

• 한국지반신소재학회논문집
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• 제3권2호
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• pp.23-29
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• 2004

폐기물 매립지 최종복토의 주요 기능중 하나는 매립지 내부로 우수의 침투를 억제하는 것이다. 이러한 기능을 담당하는 차단층은 폐기물 관리법상 다짐점토층(45cm)의 단독포설이나 다짐점토층(30cm)상부에 HDPE를 복합으로 포설하도록 되어 있다. 그러나 바닥층 사면부에서와 같이 최종복토층 끝단 사면부에서 다짐점토층의 포설이 어렵다는 문제점이 있다. 따라서 본 연구에서는 토목합성물질 사이에 차수성이 뛰어난 벤토나이트를 삽입한 토목합성수지점토라이너(Geosynthetic Clay Liner; GCL)를 다짐점토층 대신 적용하여 최종복토 끝단 사면부에서 차단층으로서의 적용가능성을 평가해 보고자 HELP 분석과 사면에서의 안정성 검토, 환경적 내구성 검토를 수행하였다. 그 결과 GCL이 기존의 다짐점토층보다 안정된 결과를 나타내고 있어 GCL을 최종복토의 차단층으로서 사용하도록 제안하고자 한다.

• 대한기계학회논문집A
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• 제26권8호
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• pp.1608-1614
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• 2002

This Paper presents a novel piston friction force measurement system that has characteristics of relieving the Pressure force acting on the upper surface of the liner; the system uses general rubber O-rings for combustion chamber sealing, and does not need special changes to the piston top land. The lower supporter of the floating liner increases stiffness in liner axial direction, and results in the increase of natural frequency. The upper supporter has multi-layer structure designed fer low axial stiffness and high radial stiffness. With the use of the present system, the effects of variation in clearance and piston ring tension were studied.

• 한국산학기술학회논문지
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• 제8권5호
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• pp.1166-1172
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• 2007

비굴착 보수 공법에 의한 파이프 보강은 전체 파손관과 부분 파손관으로 구분되어 정의된다. 부분 파손된 관내에 사용된 라이너 관은 수압만이 작용되며, 상재 하중 및 토압, 지하수에 의한 압력에 대해서 기존의 관이 모두 저항하게 된다. 본 연구는 기존에 사용되고 있는 보강튜브경화공법 설계식에 대한 라이너 보수관 적용성을 평가하여 적용가능함을 확인하였다. 또한, 개발된 말단부 처리 공법이 적용된 라이너의 안전성을 유한요소해석을 통해 평가하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.545-552
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• 2002

The purpose of this paper is to investigate permeability characteristic of soil-bentonite landfill liner and development of desirable liner system. In this study, permeability tests for soil-bentonite, reactive soil-bentonite and apply bentomat and reactive mat are carried out under the low and high water pressure. According to test result, additional amount of bentonite decreases the coefficient of permeability up to the bentonite mixture ratio of 15%. Therefore, the permeability test for landfill liner's indicated that the use of general water would be in more safe side because the liner system show low permeability duet decrease effect of porous by suspended soild(SS). The permeability of leachate for Zeolite mixture ratio 0, 5, 10% with bentonite mixture ratio 15% showed negligible variation in the permeability with general water. Therefore, Zeolite could be used as a successful that is available purification material for the treatment of leachate, without changing the of landfill liners. Also odious smell could be removed by adding smell amount of Zeolite to the leachate. It was revealed that the bentomat and reactive mat installed in soil-bentonite layer effectively improved the permeability as well as purification of the leachate.

• 한국추진공학회지
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• 제6권2호
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• pp.19-27
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• 2002

가스 발생기 추진기관 시스템에서는 연소 시 굵은 입자가 토출되면 치명적인 문제가 된다. 이러한 문제를 해결하기 위해서는 추진제에 발생하는 연소가스 입자와 더불어 라이너에서 발생되는 연소가스 입자를 최소로 하는 방안이 필요하다. 이러한 라이너 조성을 개발하기 위하여 충전제로 옥사마이드(Oxamide)를 사용하고, HTPB계 바인더를 사용한 무연 라이너 조성을 개발하였다. 라이너의 연기특성을 정량적으로 측정하기 위하여 자체 제작한 연기측정장치(Smoke Chamber)를 사용하였다. 충전제로 옥사마이드를 50%적용하였을 때가 실리카(Silica)를 50%적용 시에 비하여 연기 정도가 1/10정도로 감소하였으며 그 결과는 가스 발생기 추진기관의 연소 시험 시에도 확실하게 관찰되었다.