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Bao, Vo Nguyen Quoc,Thanh, Tran Thien,Nguyen, Tuan Duc,Vu, Thanh Dinh The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.3
The exact closed-form expressions for outage probability and bit error rate of spectrum sharing-based multi-hop decode-and-forward (DF) relay networks in non-identical Rayleigh fading channels are derived. We also provide the approximate closed-form expression for the system ergodic capacity. Utilizing these tractable analytical formulas, we can study the impact of key network parameters on the performance of cognitive multi-hop relay networks under interference constraints. Using a linear network model, we derive an optimum relay position scheme by numerically solving an optimization problem of balancing average signal-to-noise ratio (SNR) of each hop. The numerical results show that the optimal scheme leads to SNR performance gains of more than 1 dB. All the analytical expressions are verified by Monte-Carlo simulations confirming the advantage of multihop DF relaying networks in cognitive environments.
호안돈퀘 ( Hoan Doan Quoc ),이동규 ( Lee Dong Kyu ),탄반티엔 ( Thanh Banh Thien ),트란르남 ( Tran Le Nam ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
This paper studies about the buckling analysis of multi-material structure especially compressed column using topology optimization. The buckling is stated as a constraint in the optimization problem. A clamped-pinned column with applied axial compressive load is analyzed. An active-phase algorithm is used to solve multi-phase topology optimization problem. The distribution of different materials is determined in a isotropic two-dimensional design domain. The material properties is modified based on the Solid Isotropic Material with Penalization (SIMP) interpolation approach. The Method of Moving Asymptotes (MMA) is used to update the topology design variables which is relative element densities. The optimal designs of the column structure are presented and discused in the numerical applications.
탄반티엔 ( Thanh Banh Thien ),이동규 ( Lee Dong Kyu ),호안돈퀘 ( Hoan Doan Quoc ),트란르남 ( Tran Le Nam ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
The goal of this study is to investigate the effectiveness of the use of multiple materials in plate-like structures structure and provide engineers and designers an appropriate view point of multi-material topology optimization when making decision and information in design. Element density distribution contours of mixing multiple material densities are linked to Solid Isotropic Material with Penalization (SIMP) as a design model. The mathematical formulation of multi-material topology optimization problem solving minimum structural compliance is an alternating active-phase algorithm with the Gauss-Seidel version as an optimization model of optimality criteria. Some numerical examples are considered to illustrate the reliability and accuracy of the present design method for multi-material topology optimization.