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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.
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.
기하학적 영상 처리를 이용한 나노 섬유 웹의 기공 분포 측정
김주용,이정해,임대영,변성원,Kim Jooyong,Lee Jung Hae,Lim Dae Young,Byun Sung Won 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.6
An image processing algorithm has been developed in order to anlyze the nanofiber web images from a high magnification microscope. It has been known that precise pore detection of thick webs is extremely difficult mainly due to lack of light uniformity, difficulty of fine focusing and translucency of nanofiber web. The serial morphological image processing techniques of edge detection, dilation, opening, skeletonization and dilation have been applied to images for accurate pore detection followed by connect-component labeling for computing mean pore size and standard deviation of pore sizes. The pore detection algorithm developed has been found to show excellent performance in characterizing the porous structure, thus being a promising tool for the on-line quality control of eletrospun fiber manufacturing.
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.
김평강(Pyungkang Kim),변성원(Sung Won Byun),김도완(Do Wan Kim),오용삼(Yong Sam Oh),장호규(Ho Gyu Chang),곽병만(Byung Man Kwak),김경수(Kyung-Soo Kim),김수현(Soo Hyun Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
해상에 떠있는 부유체는 파도와 바람의 영향으로 항상 흔들린다. 그 중에서도 파도의 영향이 지배적인데, 파도는 사인파 형태로 주기가 거의 일정하다. 이러한 파도의 특징을 생각해보면, 흔들리는 부유체는 사인파 형태의 모멘트를 생성하는 회전질량 시스템을 이용하여 안정시킬 수 있다. 가변형 회전질량 시스템은 기본적으로 모멘트를 생성하는 시스템으로써 네 개의 같은 질량들이 비대칭으로 배치되어 회전하며 한방향으로 모멘트를 생성하도록 구성된다. 그 모멘트의 크기는 각 질량들의 상대거리를 조절함으로써 가능하다. 본 논문에서는 가변형 회전질량 시스템을 이용하여 주파수 및 파고가 변하는 파도에 대하여 부유체를 안정화하는 법과 그 결과를 논의한다. A ship on the sea rolls constantly due to wind and waves. Wave which is the major factor for the rolling can be modeled as a sine wave with a constant frequency. Considering these characteristics of wave, it is possible to stabilize a ship by compensating the wave using rotating mass system (RMS), which generates a sine-shaped moment. An RMS consists of four masses which are placed asymmetrically so that they produce only one-directional moment. The magnitude of the moment is proportional to the relative distance among the masses and the variable RMS (VRMS) is capable of changing the distance to adjust the moment. This paper will discuss how to stabilize a ship against frequency-and amplitude-varying waves using a VRMS.
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.