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진공압밀 공법용 등방성 스펀본드 지오텍스타일의 성능평가
안승재,김진일,복진선,이현석,전한용,Ahn, Seung Jae,Kim, Jin Il,Bok, Jin Seon,Lee, Hyun Seok,Jeon, Han-Yong 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.4
In this study, the performance of isotropic spunbonded geotextiles, which are used in vacuum consolidation, was tested both in the laboratory and in the field. Two kinds of isotropic spunbonded geotextiles were prepared. One was a matrix/binder structure using low-melting polyethylene terephthalate (PET) copolymer (co-PET) fibers for web bonding. The other consisted of sheath/core (co-PET/PET) fibers. Through the index test, it was seen that the performance of the sheath/core structure isotropic spunbonded geotextiles was better for use with vacuum consolidation than the matrix/binder structure isotropic spunbonded geotextiles. However, the drainage performance test, which simulates a construction environment, showed that the sheath/core structure isotropic spunbonded geotextiles were unstable. The matrix/binder isotropic spunbonded geotextiles showed better results for the drainage test and the field test results for the matrix/binder isotropic spunbonded geotextiles showed that they were suitable for use with vacuum consolidation.
안승재,차주희,유세은,전한용,Ahn, Seung Jae,Cha, Ju Hee,Yoo, Se Eun,Jeon, Han Yong 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.5
In order to minimize settlement of a shallow foundation, a model test is performed using geogrids for reinforcement. The optimal reinforcement is found by varying reinforcement length and changing reinforcement layer. From the test results, it is inferred that 2 layers and 4 times the foundation length is the most effective reinforcement condition obtained using geogrids. As a result of this tendency, 2 layers-4 times and 2 layers-5 times conditions are used to determine the reinforcement effect of two types of geogrids with the same tensile strength and of a single type of geogrid but with two tensile strengths. The reinforcement effect of the welded type is less than that of warp-knitted type. It can be seen that frictional resistance is developed at the soil-geogrid rib interface; therefore, the reinforcement capacity is reduced. It is inefficient to use reinforcement of high tensile strength under conditions of allowable bearing capacity, but it is necessary to choose reinforcement of suitable tensile strength under conditions of ultimate bearing capacity.
직포 지오텍스타일의 투수성에 미치는 기공구조의 영향 분석
안승재,정구,유중조,김의화,김홍관,전한용,Ahn, Seung Jae,Jung, Koo,Yuu, Jungjo,Kim, Eui Hwa,Kim, Hong Kwan,Jeon, Han-Yong 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.6
In this study, three-dimensional woven geotextiles with special cords were fabricated using different yarns, and then, the effect of pore structure on the water permeability of these geotextiles was evaluated and analyzed. Weft overlapping structure might have resulted in increased water permeability by creating channels for the fluid to flow. When multifilaments are used, the woven geotextiles exhibit poor air and water permeability despite the large AOS (apparent opening size). This phenomenon is attributed to the spreading of multifilaments by compression. In comparison, the split yarn showed the better air and water permeability under identical conditions. For improving the mechanical properties, it is recommended the higher denier split yarn need to be used for the better water permeable property.
Evaluation of Time-Temperature Dependence of Nonwoven Geotextiles by Salt Water Spray Test
Seung Jae Ahn(안승재),A Ram Lee(이아람),Ju Hee Cha(차주희),Han-Yong Jeon(전한용) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.4
Four types of nonwoven geotextiles to be used in this study were adopted as test materials. A laboratory exposure program was conducted to assess the 10% NaCl solution of nonwoven geotextiles to examine the applicability for the coastal engineering field. Nonwoven geotextiles specimens were cut into machine direction (MD) and cross machine direction (CMD) which were immersed in the 10% NaCl solution. The immersion conditions were 96, 192, 500 hours at 35, 45, 55, 65, 75, 85℃ respectively. Chemical resistance of these nonwoven geotextiles was estimated by the average retention of tensile properties after exposure in the above chemical solutions.
배수용 지오텍스타일의 환경노출조건에 의한 지속가능형 적용성 평가
안승재(Seung-Jae Ahn),오형선(Hyung-Sun Oh),이아람(A-Ram Lee),한지연(Ji-Yoen Han),전한용(Han-Yong Jeon) 한국지반신소재학회 2012 한국토목섬유학회 학술발표회 Vol.2012 No.11
In this study, PET spunbonded nonwoven geotextiles were used as filter media of PVD(Prefabricated Vertical Drainboard). 3.5% NaCl solution as an artificial seawater was applied to examine the long-term strength retention and reduction factor was determined from strength retention. Arrhenius models is applied to evaluate sustainable applicability of PET spunbonded nonwoven geotextiles at 25℃ is predicted.
Evaluation of Waste Landfill Applicable Performance of Geomembrane by Accelerated Index Tests
Seung-Jae Ahn(안승재),Yong-Seok Choi(최용석),Ju-Hee Cha(차주희),Hong-Gwan Kim(김홍관),Han-Yong Jeon(전한용) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11
The result of the test is reported and it has been found that number of loading cycle has irregular influence on installation damage. It is known that the service life of a GM depends on the exposure conditions, which in a landfill may involve adverse chemical exposure, elevated operating temperatures, and potentially large physical stresses. New equipment was developed and the installation damaged GM samples were exposed to pH solutions under different stress at elevated temperature for hours. It has been noticed that as the applied stress on GM samples increases, residual tensile strength decreases and they showed higher tolerance to acidic condition than alkali condition.
차주희,안승재,박상훈,전한용,Cha, Ju Hee,Ahn, Seung Jae,Park, Sang Hun,Jeon, Han Yong 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.1
Securing the stability of waste landfill is very important of environmental and economic side. In order to secure the stability of waste landfill, slope stabilization is essential. In addition, slope stability is strongly influenced by the contact shear strength of geosynthetics used as barrier wall, so accurate contact shear strength between two interfacial materials can be an important factor for designing with landfills. Therefore, in this study, the friction characteristics on the fixed slope angle were analyzed by considering the actual application environmental condition between geomembrane and geotextile used in waste landfill. The friction characteristics between nonwoven geotextile and smooth type geomembrane increased as the slope angle increased. On the other hand, the frictional characteristics between nonwoven geotextile and textured type geomembrane tended to decrease with slope angle. Also, textured type geomembrane showed about 3 times higher frictional stresses than those of smooth type geomembrane, and textured type geomembrane was more affected by the slope angle.
PLA/PMMA/PBAT 블렌드의 상용성 및 조성에 의한 특성 연구
한지연,차주희,안승재,전한용,Han, Ji-Yeon,Cha, Ju-Hee,Ahn, Seung-Jae,Jeon, Han-Yong 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.4
The viscoelastic behavior and tensile properties of PLA blends and PLA/PMMA/PBAT blends were measured, and an image analysis was performed, to examine the compatibility of PLA, PBAT, and PMMA. PLA/PMMA blends were found to exhibit a high level of compatibility for all compositions. The thermal stability, modulus, and tensile strength of these blends increased with PMMA content. Also, the glass transition temperature and tensile strength of PLA/PMMA blends varied between the values for neat PLA and PMMA, indicating a high degree of compatibility. On the other hand, ternary blends of PLA, PMMA, and PBAT exhibited a low modulus than PLA/PMMA blends; their compatibility improved with PMMA content because of PMMA acting as a compatibilizer for PLA/PBAT blends.
간세포암의 횡격막 전이에 의해 발생한 복막투석액의 흉강누출
안용성 ( Yong Sung Ahn ),강진 ( Jin Kang ),송무곤 ( Moo Gon Song ),박기태 ( Ki Tae Park ),박태익 ( Tae Ik Park ),안승재 ( Seung Jae Ahn ),송상헌 ( Sang Heon Song ),이동원 ( Dong Won Lee ),이수봉 ( Soo Bong Lee ),곽임수 ( Ihm Soo 대한신장학회 2006 Kidney Research and Clinical Practice Vol.25 No.5
Massive hydrothorax is uncommon but well recognized complication of peritoneal dialysis. Possible mechanisms include a disorder of lymphatic drainage, pleuro-peritoneal pressure gradient, and congenital diaphragmatic defects. Hydrothorax in a CAPD patient caused by infiltrative disease or malignancy is very rare. Recently, two cases of hydrothorax in CAPD patients caused by systemic amyloidosis involving diaphragm were reported. However, no case of pleuro-peritoneal communication secondary to HCC infiltrating diaphragm was reported. This case was of a hydrothorax due to HCC in a CAPD patient. We performed video-assited thoracoscopic resection of diaphragmatic mass, diaphragmatic repair and thoracoscopic talc pleurodesis. This case showed that malignancy might be considered as a cause of a hydrothorax in a CAPD patient. (Korean J Nephrol 2006;25(5):851-855)
Design and Evaluation of Engineering Properties for Water Permeability Development of Geotextiles
Koo-Jung(정구),Seung-Jae Ahn(안승재),Eui-Hwa Kim(김의화),Jungjo Yuu(유중조),Hong-Gwan Kim(김홍관),Han-Yong Jeon(전한용) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.11
In this study, the main factors that affect failures of seam were discussed and basic test on the seam conditions to seam strength was conducted. And through a model for the design strength of geotextile tube, the tensile strength of geotextile that composed tube is mentioned as a basic value, unless the seam strength is the weakest part in the geotextile tube. However, long-term resistance of seam strength have not considered for determining the design strength of geotextile tube. It is seen that seam type and stitching type are more critical than strength of seam thread.