http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
반사균열 저감을 위한 Saw and Seal 공법의 줄눈재 평가 및 효과에 관한 연구
서용환,서영찬,배종오,전범준 한국도로학회 2012 한국도로학회논문집 Vol.14 No.4
PURPOSES : The purpose of this study is to select the proper sealing method and to see the performance of the saw and seal method for concrete rehabilitation based on accelerated pavement testings and lab tests. METHODS: Two accelerated pavement testings were conducted. One is to select proper sealing method of the asphalt joints and the other is to see the performance of the saw and seal method. Lab tests were conducted to select proper sealing method and a test section was constructed to see the field performance. RESULTS : The result of the first accelerated pavement testing indicated that the adhesive preformed sealants showed good performance when asphalt layer was rutted and in terms preventing from water infiltration. The second acceleration test indicated that the saw and seal method using the adhesive preformed sealant showed much better performance than the control. In the lab test bitumen, rubber and epoxy showed good performance as the adhesive. CONCLUSIONS : Saw and Seal method using the adhesive preformed sealant would markedly reduce the joint damage on the asphalt overlay. PURPOSES : The purpose of this study is to select the proper sealing method and to see the performance of the saw and seal method for concrete rehabilitation based on accelerated pavement testings and lab tests. METHODS: Two accelerated pavement testings were conducted. One is to select proper sealing method of the asphalt joints and the other is to see the performance of the saw and seal method. Lab tests were conducted to select proper sealing method and a test section was constructed to see the field performance. RESULTS : The result of the first accelerated pavement testing indicated that the adhesive preformed sealants showed good performance when asphalt layer was rutted and in terms preventing from water infiltration. The second acceleration test indicated that the saw and seal method using the adhesive preformed sealant showed much better performance than the control. In the lab test bitumen, rubber and epoxy showed good performance as the adhesive. CONCLUSIONS : Saw and Seal method using the adhesive preformed sealant would markedly reduce the joint damage on the asphalt overlay.
뷰티샵의 서비스 스케이프와 관계혜택이 고객가치에 미치는 영향에 관한 연구
허경,오희선,서용환 한국패션뷰티학회 2004 한국패션뷰티학회지 Vol.2 No.2
As we continue to enjoy economic growth, there is an abundance of disposable income for consumer to spend. Consumers are spending more and more of these income in beauty service. However, relatively little is known about which factors influence consumer' behavior intentions in this area. The purpose of this study is to investigate the relationships between the servicescape and relational benefits on customer value in beauty salon area. The Results are summarized as follows First, as the results of data analysis, among the composition factor of servicescape, spatiality, comfortableness, cleanness and convenience are shown to give positive effect on customer value. Second, among the composition factor of relational benefits, economic honest, functional benefit, private benefit, social benefit and psychological benefit are found to have a positive relationship with customer value.
고온 열처리가 폴리페닐렌 설파이드 필름의 미세구조에 미치는 영향
함명조(Myung Jo Ham),서용환(Yong Hwan Seo),김영호(Young Ho Kim) 한국고분자학회 2020 폴리머 Vol.44 No.2
220℃에서 17일까지의 열처리가 선형성이 큰 순수 폴리페닐렌 설파이드(PPS) 수지를 용융압착하여 제조한 PPS 필름의 미세구조에 미치는 영향을 색차분석기, X-선 광전자 분광분석기(XPS), FTIR 분광분석기, 시차주사열량계, X-선 회절분석기를 사용하여 분석하였다. 열처리시간이 길어짐에 따라 PPS 필름은 점차 갈색으로 변하였으며 미열처리 시료와의 색차가 커졌다. XPS와 FTIR 분석 결과, 열처리에 의해 PPS 분자사슬 사이에 산화가교가 되었다가 이어서 벤젠링 가교가 형성되었다. 열처리에 의해 DSC 1차 승온 시의 첫 번째 용융온도는 높아졌지만 두 번째 용융온도는 거의 비슷하였으며, 용융 후 강온 시의 용융결정화 온도는 낮아졌다. 또한 열처리시간이 길어지면 승온 시의 용융열은 증가하고 강온 시의 용융 결정화열은 감소하는 경향을 나타내었지만, 열처리에 의해 PPS 결정구조가 변하지는 않았다. Effects of the heat treatment at 220℃ for up to 17 days on the microstructure of poly(phenylene sulfide) (PPS) films prepared by melt compression of virgin PPS resins of high linearity were analyzed by using color difference analyzer, X-ray photoelectron spectroscope (XPS), FTIR spectrometer, difference scanning calorimeter, and X-ray diffractometer. As the heat treatment time increased, the color of the PPS film gradually turned brown and the color difference between heat-treated and untreated sample increased. XPS and FTIR analysis confirmed that heat treatment caused thermal oxidation, followed by cross-linking of the PPS chains. The heat treatment moved the first melting temperature during the first DSC heating scan to a higher temperature while the second melting temperature remained almost constant. However, the melt crystallization temperature during the cooling scan was lowered by heat treatment. Although the heat of melting increased and the heat of melt crystallization decreased with the heat-treatment time, the crystal structure of PPS was not affected by the heat treatment.
산화 그래핀-g-폴리(ε-카프로락톤) 첨가에 의한 폴리염화비닐의 인성 향상
오필록(Pilrok Oh),서용환(Yong Hwan Seo),김영호(Young Ho Kim) 한국고분자학회 2021 폴리머 Vol.45 No.1
염화아실 유도체화한 산화그래핀(GO)에 폴리(ε-카프로락톤)(PCL) 디올을 그래프팅시켜 여러 가지 그래프트율을 갖는 GO-g-PCL을 합성하고, 이를 폴리염화비닐(PVC)의 인성을 향상시키는 필러로 사용하였다. 그래프트율이 다른 GO-g-PCL을 일정 함량으로 PVC와 혼합하거나 그래프트율이 일정한 GO-g-PCL을 서로 다른 함량으로 PVC와 혼합하여 PVC/GO-g-PCL 복합체 필름들을 제조하고, 이들의 인성을 포함한 물성 변화와 PVC와 GO-g-PCL 사이의 상호작용을 분석하였다. GO보다 GO-g-PCL을 사용하거나 GO-g-PCL의 그래프트율이 클수록 PVC의 인성 향상에 효과적이었다. GO-g(6.4%)-PCL을 사용하는 경우, 함량이 0.3 wt%일 때 인성 향상 효과가 가장 컸으며 0.5wt% 이상으로 되면 복합체의 인성이 오히려 저하되었다. GO-g-PCL은 PVC 분자사슬을 느슨하게 하여 PVC의 인성을 향상시키지만 어느 함량 이상으로 되면 이들이 서로 응집되기 때문에 인성이 감소한다. GO-g-PCL과 비스(2-에틸헥실)프탈레이트 가소제를 함께 사용하더라도 GO-g-PCL의 첨가에 의한 PVC 인성 향상 효과는 유지되었다. Graphene oxide-g-poly(ε-caprolactone) (GO-g-PCL) with various graft yields was synthesized by grafting PCL diol on acyl derivative of GO and used as a filler to enhance the toughness of poly(vinyl chloride) (PVC). PVC/GO-g-PCL composite films were prepared by mixing GO-g-PCL of different graft yields with PVC at a constant content or by mixing GO-g-PCL of a constant graft yield with PVC at different contents. Then changes in physical properties including toughness of the composite films and the interactions between PVC and GO-g-PCL were analyzed. GO-g-PCL was more effective in enhancing toughness of PVC than GO, and the toughness improved more as increasing the graft yield of GO-g-PCL. When GO-g(6.4%)-PCL was used, the toughness improvement effect was greatest when the content was 0.3 wt%, and when it was 0.5 wt% or more, the toughness of the composite decreased. GO-g-PCL improves the toughness of PVC by loosening the PVC molecular chain, but when the content exceeds a certain level, the toughness decreases because they aggregate together. Even when GO-g-PCL and bis(2-ethylhexyl) phthalate plasticizer were used together, the effect of improving PVC toughness by the addition of GO-g-PCL was maintained.