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군 전술망의 무선 이동 통신 체계의 통신 범위 중첩을 고려한 채널 할당 기법과 데이터 전달 기법
신현섭,채성윤,강경란,조영종,Shin, Hyun-Sup,Chae, Sung-Yoon,Kang, Kyung-Ran,Cho, Young-Jong 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
In this paper, we propose a channel allocation algorithm of MSAP(Mobile Subscriber Access Point) and data delivery scheme exploiting the symbol level network coding. The network is comprised of TS(Tactical Switch) as a backbone node, MSAPs, and TMFTs(Tactical Multi-Function Terminal). The TS performs the channel allocation considering the communication range overlapping between the neighboring MSAPs and applies the symbol level network coding, if necessary, depending on the position of the TMFTs. Assuming the number of available antennas of TMFT and MSAP will be extended to two from one, we propose two schemes: single mode and dual mode. Through the simulation, we show that the proposed delivery scheme provides higher delivery ratio and lower delivery delay compared with the legacy store-and-forward scheme.
VE기법으로 유동화 공법 도입에 대한 현장 적용성 연구
신현섭 ( Hyun-sup Shin ),박용규 ( Yong-kyu Park ),윤재령 ( Jae-ryung Yoon ),전충근 ( Chung-keun Jeon ),한민철 ( Min-cheol Han ),한천구 ( Cheon-goo Han ) 한국건축시공학회 2006 한국건축시공학회 학술발표대회 논문집 Vol.6 No.2
This study investigates field application of flowing concrete in order to improve workability, quality and economic evaluation of concrete. Test results showed that slump of fresh concrete satisfied the target value before and after flowing concrete, and setting time indicated 3 hours difference depending on the mixture proportion of ready-mixed-concrete company. As for the hardened concrete, compressive strength of standard curing specimens, both control and flowing concrete, presented designed value at 28days elapse. However, the specimens curing at atmosphere decreased the value, due to the lower curing temperature, but also performed the designed value at 91 days. For the evaluation of construction fee by value engineering(V.E) concept, a flowing method declined 4.89% of concrete construction fee, which is 4.9% reduction for materials and 25% reduction for labor expenses, compared with previous construction methods.
나일론 및 셀룰로오스 섬유가 콘크리트의 역학적 특성에 미치는 영향
신현섭 ( Shin Hyun-sup ),박용규 ( Park Yong-kyu ),김광련 ( Kim Kwang-ryeon ),이건철 ( Lee Gun-cheol ),김병기 ( Kim Byung-gi ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
This study investigated the influence of nylon(NY) and cellulose(CL) fiber on the fundamental and mechanical properties of concrete. Test showed that increase of NY and CL fiber contents proportionally decreased concrete fluidity. It is found that concrete containing more than proper amounts of fiber should be reconsidered. Although adding higher ratio of fiber caused slightly increased air content, all specimens were satisfied in aimed value. In addition, using both NY and CL fiber resulted in higher value of bleeding capacity, and retardation of setting time. For the properties of strength, both compressive and tensile strength was indicated at similar value to control concrete. However, it is clear that if those concrete containing fiber revised the value of increased air contents at fresh state, the strength value of that would be slightly increased. Flexural strength of concrete containing NY fiber was indicated at higher value than CL fiber. Concrete adding 0.6kg/m3 of fiber highly reduced plastic shrinkage crack area and showed the most favorable impact resistance performance.
유기질 섬유 종류가 콘크리트의 공학적 특성에 미치는 영향
신현섭 ( Hyun-sup Shin ),김광련 ( Kwang-ryeon Kim ),이건철 ( Gun-cheol Lee ),김병기 ( Byung-gi Kim ),한천구 ( Cheon-goo Han ) 한국건축시공학회 2006 한국건축시공학회 학술발표대회 논문집 Vol.6 No.1
This study investigated influence of organic fiber type and contents on engineering properties of concrete. Test showed that increase of fiber contents decreased fluidity of fresh concrete and it was even worse in concrete adding cellulose fiber. It is decided that containing more than proper level of fiber should be considered. In addition, concrete adding more fiber, nylon and cellulose, resulted in increase of air content but it was satisfied in aimed value. Bleeding capacity of concrete containing more fiber significantly declined and setting time of what was also slightly retarded. For the properties of strength, both compressive and tensile strength of fiber containing concrete were indicated at similar value to control concrete. However, it is clear that if those concrete containing fiber revised the value of increased air contents at fresh state, the strength value of that would be slightly increased.
유기질 섬유보강재를 사용한 시멘트 모르터의 공학적 특성
신현섭 ( Hyun-sup Shin ),박용규 ( Yong-kyu Park ),김경민 ( Kyoung-min Kim ),이건철 ( Gun-cheol Lee ),황인성 ( In-sung Hwang ),한천구 ( Cheon-goo Han ) 한국건축시공학회 2005 한국건축시공학회 학술발표대회 논문집 Vol.5 No.2
This study investigates influence of organic fiber reinforced materials, affecting crack reduction of cement mortar using low grade natural sand(LNS). According to the test, for the properties of the fresh mortar, the mortar using natural sand(NS)exhibited that flow value increased until adding most of fiber less than 1%, except for Polyvinly alchol fiber(PVA), and then it decreased, Meanwhile, the mortar mixed with LNS showed that increase of fiber content decrease flow value, regardless of fiber type. Air content increased in the mortar adding fiber(NY) and polypropylene fiber(PP), while it miantained or decreased in the mortar adding cellulose fiber(CL) and PVA. Compressive strength of the mortar does not affect during early age, but mortar using NS and adding 0.1% of fiber content increased the value, except for PP, at 28age days, while the mortar mixed with LNS decreased. For the properties of tensile strength mortar, using NS and adding individually PP and PVA, exhibited higher value. Especially 0.1% of NY provided the highest value, IN addition, the mortar mixed with LNS resulted in improved tensile value as fiber content increased. It is demonstrated that mortar using LNS led to higher length change ratio than natural sand.
신현섭(Shin Hyun-Sup),김종백(Kim Jong-Back),김광련(Kim Kwang-Ryeon),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
This study investigates engineering properties of concrete containing nylon(NY) and cellulose(CEL) fiber. Test showed that increase of fiber adding ratio decreased fluidity, especially for CEL fiber, and it slightly increased air content satisfying target range. As for the properties of hardened concrete, most specimens containing NY or CEL fiber exhibited similar performance to control concrete in the values of compressive, tensile and flexural strength. However, even if it revised the strength considering increase of air content, those specimens adding fibers would have slightly inclined the value, compared with that of control. In addition, as for the impact strength of specimens, the NY specimen showed higher than that of CEL, especially for adding 0.6㎏/㎥ of NY fiber. Adding fiber did not affect length change ratio of specimens, while it showed even higher value than that of control, when added more than 0.9㎏/㎥ of NY fiber.
나일론 및 셀룰로오스 섬유가 콘크리트의 역학적 특성에 미치는 영향
신현섭(Shin Hyun-Sup),박용규(Park Yong-Kyu),김광련(Kim Kwang-Ryeon),이건철(Lee Gun-Cheol),김병기(Kim Byung-Gi),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
This study investigated the influence of nylon(NY) and cellulose(CL) fiber on the fundamental and mechanical properties of concrete. Test showed that increase of NY and CL fiber contents proportionally decreased concrete fluidity. It is found that concrete containing more than proper amounts of fiber should be reconsidered. Although adding higher ratio of fiber caused slightly increased air content, all specimens were satisfied in aimed value. In addition, using both NY and CL fiber resulted in higher value of bleeding capacity, and retardation of setting time. For the properties of strength, both compressive and tensile strength was indicated at similar value to control concrete. However, it is clear that if those concrete containing fiber revised the value of increased air contents at fresh state, the strength value of that would be slightly increased. Flexural strength of concrete containing NY fiber was indicated at higher value than CL fiber. Concrete adding 0.6㎏/㎥ of fiber highly reduced plastic shrinkage crack area and showed the most favorabie impact resistance performance.
신현섭 ( Shin Hyun-sup ),김종백 ( Kim Jong-back ),김광련 ( Kim Kwang-ryeon ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
This study investigates engineering properties of concrete containing nylon(NY) and cellulose(CEL) fiber. Test showed that increase of fiber adding ratio decreased fluidity, especially for CEL fiber, and it slightly increased air content satisfying target range. As for the properties of hardened concrete, most specimens containing NY or CEL fiber exhibited similar performance to control concrete in the values of compressive, tensile and flexural strength. However, even if it revised the strength considering increase of air content, those specimens adding fibers would have slightly inclined the value, compared with that of control. In addition, as for the impact strength of specimens, the NY specimen showed higher than that of CEL, especially for adding 0.6kg/m<sup>3</sup> of NY fiber. Adding fiber did not affect length change ratio of specimens, while it showed even higher value than that of control, when added more than 0.9kg/m<sup>3</sup> of NY fiber.