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전기방사된 Poly(Acrylonitrile-co-Methylacrylate) 웹의 여과 특성
정세관,임대영,변성원,정용식,Jeong Se Kwan,Lim Dae Young,Byun Sung Won,Chung Yong Sik 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
Non-woven fabrics of electrospun fibers show larger specific surface area and much smaller pore size than conventional ones, which make them excellent candidates for filtration media and membrane applications. Electrospinning combines the charging of polymer and the spinning of the fibers as an one-step process. We made the filter media from poly(acrylonitrile-co-methylacrylate) via electrospinning and evaluated the filtration characteristics. The filtration efficiency and the pressure loss increased with higher level of applied voltage, collector speed, and calendering pressure. This resulted from the decrease of pore diameter. Especially, the increase in basis weight of the web can improve the filtration efficiency without rapid pressure loss.
토목섬유로 보강한 흙 시료의 일축 및 삼축 압축거동 해석
김현중,김윤진,변성원,주창환,전한용,Kim, Hyun-Joong,Kim, Yoon-Jin,Byun, Sung-Won,Jo, Chang-Whan,Jeon, Han-Yong 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3
In this study, the effects of geosynthetics reinforcements on compressive behaviors of weathered granite soils were investigated by uni-axial and tri-axial compression tests. Geogrid, geomat, and polyethylene slit film fiber were used as reinforced geosynthetis. From the experimental results, these geosynthetics reinforcement effects could increase the compressive strength of soil and especially, the reinforced effects of geogrid and geomat were extremely excellent compared to polyethylene slit film fiber reinforced. This effect is larger for 3 layer geosynthetics used. For triaxial compression test, despite unconsolidated undrained condition, it is seen that the increasing shear strength of the weathered granite soils is due to the increasing adhesive power.
골프산업에서 제품의 고가격,고품질 전략이 브랜드 충성도에 미치는 영향
최우석(Woo Seok Choi),변성원(Sung Won Byun),김의주(Eui Joo Kim) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.40
In this study, we will establish differentiated products and marketing strategies(high price strategy, high quality strategy) in Saturated market. and We analyzed the interrelation between high price, high quality and brand loyalty and also moderating effect on brand image. We visited 28 outdoor golf practice places in Daegu and 10 golf courses near Daegu and Kyungpook, and then conducted a survey 280 outdoor golf practice place visitors and 20 golf course visitors using Self-Legislation Period in the questionnaires. Collected questionnaires were analyzed through Hierarchical Regression Analysis. As a result, the causal relationship between high price strategies, high quality strategies and brand loyalty has the positive effect, but moderating effect on brand image showed that the effect between only high quality and brand loyalty partially. Therefore, we may build some strategies in Golf industry. First, High-brand-image(high price and high quality) strategies for increasing the brand loyalty must be provided feedback for consumer in terms of product and service aspects. Second, The enterprises are needed to come to the customers with the higher quality of products and brand image not with lower prices as this research has shown that brand images relates to the increasement of brand loyalty positively. In the future, the research samples are need to be collected within expanded scale. and the factors of brand loyalty should be divided more specifically (including individual factors) to understand customers need. and this study was demonstrated using the cross-sectional design which is one of the weakness of this study. So we suggest that for the future study, vertical-sectional design will present more precise result.
진용범(Jin Yong-Bum),변성원(Byun Sung-Won),전한용(Jeon Han-Yong) 한국토목섬유학회 2006 한국지반신소재학회 논문집 Vol.5 No.4
다짐조건을 달리하여 3가지 종류 지오그리드의 내시공성을 측정하였다. 이 실험은 ENV ISO 10722-1에 근거하여 실행되었다. 채움재와 관계없이 다짐횟수가 증가할수록 지오그리드의 인장강도는 감소하였으며, 지오그리드 종류에 따라 감소되는 경향이 다르게 나타남을 알 수 있었다. Woven 및 warp-knitted type 지오그리드의 경우 접합형 지오그리드에 비해 더 큰 감소경향을 나타내었다. Installation damage of 3 types of geogrids were evaluated with compaction condition. This experimental test was in accordance with ENV ISO 10722 1. Tensile strength of geogrids were decreased with number of cyclic compaction loading without ? regard to kind of filled material and it was seen that strength decrease tendency showed the dependence on geogrid type. Woven and warp-knitted type geogrids showed the bigger decrease of tensile strength than welded type geogrids.
HR-WPAN에서 링크 상태에 따른 동적 채널 타임 할당 기법
강재은(Jae-Eun Kang),변성원(Sung-Won Byun),이정규(Jong-Kyu Lee) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.3
본 논문에서는 IEEE 802.15.3 HR-WPAN(High Rate Wireless Personal Area Network)의 PNC(PincoNet Coordinator)에서 DEV(DEVice)의 링크 상태에 따라 동적으로 채널 시간을 할당하는 DABL(Dynamic Allocation of channel times Based on Link quality of the DEV) 알고리즘을 이용하여 시스템에서의 평균 트래픽 전송률을 향상시키고 지연시간을 감소시키는 방법을 제안한다. 좀 더 구체적으로, DABL 알고리즘은 DEV의 링크 상태에 따라 다중 변조 기법을 제공할 뿐만 아니라, 슈퍼프레임에서의 각 DEV를 위한 채널 타임도 동적으로 스케줄링하는 방법을 제공한다. 또한 트래픽의 QoS(Quality of Services)를 고려하여, 본 논문에서는 실시간 트래픽과 비실시간 트래픽으로 구분하여 DABL 알고리즘을 제안하였다. 마지막으로, 본 논문에서는 기존 균등 분할 방식과 DABL 방식의 성능 비교를 위해 시뮬레이션을 수행하였다. For IEEE 802.15.3 HR-WPAN, we propose the DABL algorithm that PNC can allocate the channel times to the DEV in super frame in order that system frame throughput is increased and the delay is decreased. In detail, the DABL algorithm allows to dynamically allocate channel time as well as to adaptively apply the modulation and coding scheme based on the link quality of the DEV. In addition, due to the facts that QoS is quite different depending on service types, we provide the DABL algorithm taking into account RT(Real Time) traffic and Non-RT traffic respectively. Finally, we show simulation results of the DABL algorithm compared to the conventional algorithm that the PNC equally allocates channel times to the DEV regardless of the link quality of the DEV.
임지혜(Lim Ji-Hye),변성원(Byun Sung-Won),전한용(Jeon Han-Yong) 한국토목섬유학회 2006 한국지반신소재학회 논문집 Vol.5 No.4
흙 입자의 크기를 고려한 5종류의 샌드페이퍼를 사용하여 지오스트립/샌드페이퍼 계면에서의 마찰특성을 평가하였으며, 전단력에 의한 마찰계수와 마찰각 등을 구하였다. 설계강도가 각각 50, 70, 100KN/m인 3종류의 지오스트립이 사용되었으며, 입자 크기가 각각 P100, 220, 320, 400, 600인 5종류의 샌드페이퍼가 사용되었다. 지오스트립의 설계강도에 따라 전단강도는 큰 차이를 나타내지 않았으며, 이는 전단 시 접촉되는 지오스트립 표면이 강도에 따라 차이가 나지 않고 비슷하기 때문이다. 샌드페이퍼의 입자의 크기가 클수록 더 큰 전단강도 값을 나타내었으며, 지오스트립/P100 계면에서 가장 큰 값을 나타내었다. 끝으로 모든 시료의 경우 post-peak 강도 감소 현상이 나타났으며, 이는 전단 시험에 의한 지오스트립 표면 의 마모에 기인한다. Frictional properties between geostrip and sand paper interface were estimated considering soil particle size also the friction coefficients and angles were determined with normal stress. Three kinds of geostrips of design strength 50, 70, 100 KN/m were used and 5 sandpapers of P100, P220, P320, P400, P600 were used also. Shear strength between geostrip and sand paper interface with design strength showed big difference and this is due to the uniform surface pattern of each geostrip when contact to sandpaper without regard to design strength. Shear strength of geostrip was increased with design strength and geostrips/P100 sandpaper interface showed the biggest value. Finally, all of geostrips showed the decrease phenomena of post-peak strength and this is due to the abrasion of geostrip surface by shear test.