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이장백(Jang-Baek Lee),성현종(Hyun-Jong Sung),박태웅(Tae-Woong Park),김형주(Hyeong-Joo Kim) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
In this study, a custom-made geotextile tube made of polypropylene (PP) material was used during a large-scale experimental test. Dredged soil sediments (USCS Category: SM) collected from within the Saemanguem estuary were utilized as fill materials for the geotextile tube. Slurry was hydraulically pumped into the geotextile tube. A T-shaped slurry delivery system installed at the inlet of the geotextile tube is introduced in this paper. The tube was filled with dredged soil until its vertical height reaches up to 50% its theoretical diameter. The soil distribution inside the geotextile tube generated by the T-shaped inlet was improved. The quantity of the fine-grained particles passing #200 sieve increases as the sedimentation distance extends farther from the inlet location, that is, the amount of fine-grained soil passing #200 sieve at the ends of the geotextile tubes is higher than the amount of fine-grained soil passing #200 sieve around the inlet. Moreover, the properties of the soil in the uppermost deposition layer is identical to the physical properties of soil sediments in the bottom layer. However, the domestically produced geotextile material used in the experiment expelled a considerable amount of surplus silt outside the geotextile tube. The amount passing #200 sieve for the surplus soil is 43.3%. For the type of soil used in the experiment, it is recommended that a geotextile material with finer openings should be used.
준설 토목섬유 튜브의 배수상태에 따른 지지력 변화에 관한 연구
이장백(Jang-Baek Lee),성현종(Hyun-Jong Sung),이광형(Kwang-Hyung Lee),김형주(Hyeong-Joo Kim) 한국지반신소재학회 2014 한국지반신소재학회 학술발표회 Vol.2014 No.4
In this study a cone penetration test on a dredged soil filled geosynthetic tube was performed after the tube attained its final height. The cone penetration was carried at different point locations along the length of the geosynthetic tube under submerged and dry conditions. It was found that the bearing capacity of the soil inside the tube is low when the geotextile tube is submerged in water. The bearing capacity of the tube structure is increased when water is drained.
토사 주입과 배수 시 원형 아크릴 튜브 구조체의 압력 변화에 대한 실험적 연구
김형주,원명수,이장백,박태웅,Kim, Hyeong-Joo,Won, Myoung-Soo,Lee, Jang-Baek,Park, Tae-Woong 한국복합신소재구조학회 2015 복합신소재구조학회논문집 Vol.6 No.3
A series of injection and drainage test were conducted on an circular acrylic tube to investigate the pressure generated by the accumulated fill materials inside a circular acrylic tube structure. The acrylic tube was filled by means of gravity filling with a slurry material having an average water content of 700%. The water head during the filling process was 1.8m and the bottom pressure during initial filling was 20.18kPa. The recorded stress at the sides of the acrylic tube was 17.89kPa during the filling process and was reduced to 13.58kPa during the leaving process. Continuous drainage of the acrylic tube has greatly influenced the stresses around the tube structure. As the water is gradually allowed to overflow, the generated pressure at the topmost pressure sensor of the tube was reduced further to 2.17kPa. Eventually, the initially liquid state slurry material transforms into plastic state after water has dissipated and substantial soil particles are deposited in the acrylic tube. The final water content of the deposited silt inside the acrylic tube after the test was 42%. It was found that the state of stresses(geo-static earth pressures) in the acrylic tube was anisotropic rather than isotropic.
클러스터 파일 시스템 SANique™ 기반의 DBMS 표준 성능 평가
황진호(Jin-Ho Hwang),백은주(En-Ju Baek),이규웅(Kyu-Woong Lee),이장선(Jang-Sun Lee) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
본 논문은 SAN(storage area network)상에 네트워크-부착형(network-attached) 저장 장치들을 직접 연결하여 파일 서버 없이 직접 데이터 전송이 가능한 SAN 기반의 클러스터 공유 파일 시스템인 SANique™의 설계 기법을 설명하고 SANique™ 시스템의 기본 파일 입·출력 연산 성능을 집중적으로 평가하기 위해 상용 DBMS의 기본 연산 트랜잭션을 구성하여 기존 파일 시스템 기반의 DBMS와 비교 분석한다. 또한 표준 성능평가 도구인 TPC-C 표준 벤치마크 테스트 도구를 활용하여 리눅스 시스템 및 Solaris 시스템 환경의 파일시스템과 비교한다.