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Lyapunov 재설계 방법을 이용한 무인 수상정의 군집 제어
우상범(Sangbum Woo),이재용(Jaeyong Lee) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
In this paper, a practical controller for a group of USVs is proposed in order to avoid matrix inversion problems in computation. Using nonlinear mapping, a formation composed of nonholonomic agents can be stabilized even when the formation is stationary. Since there is no matrix inversion in computing the control law, the computation complexity can be resolved. A controller for stabilizing the formation errors in the presence of model uncertainty is considered using the Lyapunov redesign method. The asymptotic stability of the formation errors is shown. It is also shown that the proposed controller can be applied to guide a formation to a different shape without modification.
우상균 ( Woo Sang-kyun ),이홍표 ( Lee Hong-pyo ),송영철 ( Song Young-chul ),조명석 ( Cho Myung-seok ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
In this paper the characterization test for bond performance of CFRP plate was conducted, and based on its results, a new bond-slip model was proposed. The experiment results showed that as bond length and width of CFRP plate increased, its fracture load increased, but the increase also showed a tendency to reduce average bond stress due to the increase in bond surface. Also, as bond length and width increased, the strain of CFRP plate increased, but unlike bond length, increase in bond width was shown to reduce maximum bond stress. Among the test variables, as concrete strength increased in comparison to CFRP plate's bond length and width, fracture load and average bond stress showed tendency to increase, but the effect was revealed to be not significant. Also, as bond length increased, bond stress concentration was transmitted to the end parts of the CFRP plate, and as bond width increased, bond stress showed a tendency to uniformly spread along the bond surface. Based on the results of the bond experiment, a bilinear function was introduced to the ascending section and an exponential function was introduced to the descending section in correlating shear stress and slip in the bond-slip model, and a new bond-slip model was proposed that can effectively be applied to the analysis of boundary surface behavior between concrete and CFRP plates.
고속 인터넷을 위한 TCP/IP 가속기의 구현과 성능분석에 관한 연구
우상철 ( Sang-cheol Woo ) 한국고등직업교육학회 2001 한국고등직업교육학회논문집 Vol.2 No.2
Among all protocols, TCP/IP is one of the most popular suites in use. But TCP/IP was accused if being too slow for high speed networks. So there was many studies of TCP/IP for high speed network. In this paper, Some parts of TCP/IP suites are implemented by hardware and others are implemented by software on an embedded RISC CPU. This hybrid method is easier be implemented than a pure hardware TCP/IP and performs over than pure software TCP/IP on an embedded RISC CPU. The TCP/IP accelerator card(TAC) has an Intel i960 and software TCP/IP module is modified Waterloo TCP/IP and tested by Intel Mon960. Hardware module is designed using VHDL, complied and simulated using Altera, Synopsys.
우상균(Sanggyun Woo),표영덕(Youngdug Pyo),이영재(Younjae Lee),이충원(Choongwon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Dimethyl ether(DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meet the ULEV emission regulation and reduce the smoke to almost zero when used in a diesel engine. Cogeneration is an energy conversion process, where electricity and useful heat are produced simultaneously in one process. Also, carbon dioxide emissions can be substantially reduced. Cogeneration heat can be used either for district heating or for industrial processes. Furthermore, the heat by-product is available for use without the need for the further burning of a primary fuel. The cogeneration process may be based on the use of steam or gas turbines or combustion engines. However, there have been few models with an output of less than 100 kilowatt. In the present study, conventional DI diesel engine by using DME fuel with generation output of 25 kilowatts was developed for micro cogeneration package. Test results showed that the torque and power with DME were same as those of pure diesel oil, but the brake thermal efficiency decreased a little. Also, smoke index from DME engine showed nearly zero level and NOX was decreased a little compared to diesel oil. The EGR system was the very effective method to reduce the NOX emission in case of DME fuel in diesel engine.
탄산화에 노출된 철근콘크리트 구조물의 로그 및 정규 수명분포를 고려한 보수비용 해석
우상인(Sang-In Woo),권성준(Seung-Jun Kwon) 한국건설순환자원학회 2018 한국건설순환자원학회 논문집 Vol.6 No.3
지하구조물에 주로 발생하는 탄산화는 콘크리트 내부의 공극수의 pH감소에 따라 부식을 유발할 수 있으므로 많은 연구가 진행되고 있다. 그러나 이산화탄소로부터 표면을 보호하는 간단한 표면 보수방법을 통하여 구조물의 내구수명의 연장이 가능하다. 기존의 결정론적 유지관리 기법과는 다르게, 확률론적 유지관리 기법에서는 내구수명의 변동성이 고려될 수 있으나 정규분포만 다루고 있다. 본 연구에서는 정규분포 이외에 로그분포를 고려할 수 있는 수명-확률분포를 유도하였으며, 이를 기초로 다양한 수명-확률분포 함수를 고려한 보수비 산정기법을 제안하였다. 제안된 기법은 초기의 내구수명 분포 또는 보수재를 통하여 연장된 내구수명 분포가 정규 또는 로그분포를 가질 경우 목표내구수명의 연장에 따라 확률론적 기법을 통하여 보수비를 평가할 수 있다. 보수를 통한 내구수명이 로그분포를 가질 경우 효과적으로 보수비를 감소시킬 수 있으며, 장기 실험 또는 실태조사를 통하여 내구수명 분포가 정의될 수 있다면 더욱 합리적인 유지관리 계획을 수립할 수 있을 것으로 판단된다. Many researches have been carried out on carbonation, a representative deterioration in underground structure. The carbonation of RC (Reinforced Concrete) structure can cause steel corrosion through pH drop in concrete pore water. However extension of service life in RC structures can be obtained through simple surface protection. Unlike the conventional deterministic maintenance technique, probabilistic technique can consider a variation of service life but it deals with only normal distributions. In the work, life time-probability distributions considering not only normal but also log distributions are induced, and repair cost estimation technique is proposed based on the induced model. The proposed technique can evaluate the repair cost through probabilistic manner regardless of normal or log distribution from initial service life and extended service life with repair. When the extended service life through repair has log distribution, repair cost is effectively reduced. The more reasonable maintenance strategy can be set up though actual determination of life-probability distribution based on long term tests and field investigations.