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- 저자 : 이윤성 ( Yun Sung Lee ) (검색결과 72 건)
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이윤성,이상수,송하영,배기선,이성복,이도헌,Lee, Yun-Seong,Lee, Sang-Soo,Song, Ha-Young,Bae, Kee-Sun,Lee, Sung-Bok,Lee, Do-Heun 한국토지주택공사 토지주택연구원 2010 토지주택연구 Vol.1 No.1
Most of the dredged sand generated from the sewage pipe maintenance project and the government's four-river project are disposed depending on abandonment and filling-up. This is caused by the lack of related recycling technology using dredged sand appropriately and high absorption rate and micro-particles of dredged sand producted from existing sand production system. Thus, this study carried out a quality assessment for the dredged sand produced through the optimum washing and sorting system supplementing problems of existing dredged sand production system as a part of research to examine performance of removing micro-particles and foreign substances. As a result of the assessment, the dredged sand produced through the cleaning and sorting system showed a wide quality improvement effect in absorption rate, 0.08 mm sieve pass amount, clay lump volume and organic impurity content, and it turned out to satisfy both the quality standards of this study, KS F 2573(recycled aggregate for concrete) and KS F 2526(aggregate for concrete) so it could be confirmed that it would be able to be used as an aggregate for concrete in the future.
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화학적 합성법에 의한 금속수소화물의 제조 및 수소화 속도론적 연구
이윤성,오재완,문성식,남기석 ( Yun Sung Lee,Jae Wan Oh,Sung Sik Moon,Kee Suk Nahm ) 한국공업화학회 1998 공업화학 Vol.9 No.2
Metal hydrides, LaNi_5 and LaNi_(4.5)Al_(0.5), were prepared using chemical synthetic method, and their physical properties were examined using various analytic techniques such as TGA, XRD, SEM, and EDX. The activation of the chemically prepared LaNi_5 and LaNi_(4.5)Al_(0.5) was achieved by twc hydriding/dehydriding cycles only. The measurements of P-C-T curves revealed that 6 and 5.5 hydrogen atoms were stored in LaNi_5 and LaNi_(4.5)Al_(0.5) respectively. The hydriding reaction rates for LaNi_(4.5)Al_(0.5) were measured by the method of initial rates. It was found that the shrinking unreacted core model could be applied for the analysis of hydriding kinetics of LaNi_(4.5)Al_(0.5). The rate controlling step of this reaction was the dissociative chemisorption of hydrogen molecules on the surface of LaNi_(4.5)Al_(0.5). The activation energy was 9.506kcal/mol-Hz. The rates measured in the temperature range from 273 to 343 K and in the pressure difference (P_0 - P_(eq)) range from 0.25 to 0.66 atm could be expressed as the following equation ; dX/dt = 4.636(P_0 - P_(eq)) exp (-9506/RT)
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MP-AODV : A New Multipath Routing Protocol Based on AODV in Mobile Ad Hoc Networks
이윤성(Yun-Sung Lee),정상화(Sang-Hwa Chung) 한국컴퓨터정보학회 2011 한국컴퓨터정보학회논문지 Vol.16 No.6
In this paper, we propose a new multipath routing protocol and compare it with other multipath routing protocols in mobile ad hoc network (MANET) environments. The new multipath routing establishes the main route using a mechanism based on Ad Hoc On-demand Distance Vector(AODV), after which data transmission starts immediately. The backup route search process takes place while data are transmitted, to reduce the transmission delay. The protocol can also operate in a hybrid node-disjoint/link-disjoint mode, where the protocol finds the node-disjoint backup route first; if the node-disjoint does not exist, the protocol discovers the link-disjoint backup route from the main route. When either of the main route or the backup route is broken, data are transmitted continuously through the other route and the broken route is recovered by the route maintenance process. The results of simulations, based on the Qualnet simulator, show that the proposed multipath routing protocol increases the packet transmission success rate and reduces end-to-end delays, when compared with AODV and AOMDV protocols.
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폴리올레핀계 분리막의 친수화 처리방법에 따른 Ni-MH 2차 전지의 전기화학적 특성연구
이윤성 ( Yun Sung Lee ),송리규 ( Li Gyu Song ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2
It was investigated the electrochemical characteristics of the Ni-MH battery by hydrophilic process. For adopting the Ni-MH battery in water-electrolyte, polyolefin separator was processed the hydrophilic treatment. No treatment sample did not meet KS standard (KSC 8544) but hydrophilic treatment ones satisfied with the KS standard in electrochemical characteristics, such as discharge performance, retention capacity, and cycle performance. All hydrophilic treatment samples showed similar battery performances. Among them, sulfonation treatment sample exhibited the highest value in aspect of capacity retention rate (> 88%). Furthermore, fluoride treatment sample showed the best cycle performance during battery test. This sample maintained a good cycling performance until 1,480th cycle, which was about 3 times as compared with that of KS standard (500 cycle).
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SFFB를 사용한 3성분계 고강도콘크리트의 유동 및 강도특성
이윤성(Lee Yun-Seong),박종필(Park Jong-Pil),이강필(Lee Kang-Pil),길배수(Khil Bae-Su),이상수(Lee Sang-Soo),송하영(Song Ha-Young) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The study, as an experiment on applicability of SFFB high strength concrete as substitute material of silica fume, compared and analyzed the concrete flowing and strength properties experimentally in accordance with replacement ratio of SFFB, blast furnace slag and fly ash. As a result of it, the conclusion is as follows. The high range water reducing admixture amount used in which the ternary system concrete of the fly ash and SFFB is needed for the target flowing was less than the ternary system concrete of the blast furnace slag and SFFB. In addition, the material age compressive strength was develop to be excellent.
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샌드플럭스 장치의 대,소용량 차이에 따른 고품질 순환모래의 품질특성에 관한 연구
이윤성 ( Yun Sung Lee ),이지환 ( Ji Hwan Lee ),배기선 ( Kee Sung Bae ),이상수 ( Sang Soo Lee ),송하영 ( Ha Young Song ) 한국건축시공학회 2009 한국건축시공학회 학술발표대회 논문집 Vol.9 No.1
This study was to execute the basic property evaluation of recycled sand which produced by the sand flux device in order to evaluate the performance of differences between smallㆍlarge sand flux device. As a result, this study has found out that the recycled sand after passing the sand flux device had excellent quality characteristics compared with the one before passing the device. In additional experiment on the basic material properties, this study showed a tendency to improve the quality and performance significantly in case of fineness modulus, absolute surface dried density, 0.08mm sieve throughput, volume of clay lumps, and content of organic foreign matter. In conclusion, it was considered as various quality performances of recycled sand were improved through the production stage of prototype.
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