Papers by Keyword: Dynamic

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Authors: Ya Jun Zhang, Jin Liang Shi, Guo Rong Chen
Abstract: A mechanism that the backoff exponent changes dynamically was proposed aiming at the poor performance of backoff algorithm in IEEE 802.15.4 MAC protocol. The algorithm could adjust the initial backoff exponent according to the previous transmission status and the backoff exponent. A Markov chain model for the algorithm was established and the mathematical derivation for the model was carried out. The theoretical analysis and simulation results show that the model increases the channel access probability and system throughput. The optimized algorithm improves the performance of LOWPAN effectively.
Authors: Huan Huan He, Xing Wei Wang, Min Huang
Abstract: . In this paper, to help cognitive users conduct fair and efficient spectrum sensing in the heterogeneous wireless environments, a coalitional game based spectrum sensing scheme is proposed. The method of calculating the basic parameters of spectrum sensing is introduced at first, and then the spectrum sensing problem is modeled as a coalitional game with non-transferable utility. A coalition is built with Pareto optimality satisfied, and its procedure is described in details. Simulation results have shown that the proposed scheme is both feasible and effective.
Authors: Ying Hui Lv, Yan Zhen Yu
Abstract: In solving non-linear inverse optimization problems, how to make sure one and only solution and cut down computational effort are two very representative challenges. As thus, the derivative-free filled function method is proposed, it couples the classical filled method theory and dynamic canonical descent method. The application results of non-linear inverse analysis of material parameters for a practical engineering show that the derivative-free filled function method can quickly solve non-linear inverse problems with one and only solution, and it will be robust one in non-linear inverse solution field.
Authors: Da Hu Wang, Wen Bo Chen, Yan Nan Shi
Abstract: Because of the lacking of realistic, the operators who use the existing simulation training systems cannot immerse into it. This paper presents a method that taking the EBH-120 roadheader as an example to solve the problem, with the method a motion simulation method based on physics engine is figured out. It uses 3ds Max for making 3D models and Newton physics engine for dynamic simulation. The result showed the roadheader simulation training system with real physics properties was developed based on Quest3D and Newton physics engine; it can improve the immersion of this system, and increase the deficiency of coal mine training field.
Authors: Zhi Gang Si, Ping Li, Xin Chen, Ying Wan
Abstract: A trusted computing platform is designed based on XEN virtual machine, and a dynamic integrity measurement scheme is presented using hypercall mechanism. This scheme can solve the deficiency of limited scope or complicated structure comparing with other dynamic integrity measurement schemes.
Authors: Tao Ye
Abstract: Based on the illustration of the importance of the coordination between forest and socio-economy, a dynamic programming model aimed at the coordination is created and the basic characters of the functions in the model are discussed. A solution under a simple and ideal situation is studied, which results in the equation of the economic yield when forest coordinates with socio-economy and several other conclusions.
Authors: Yong He, Lei Gao, Gui Kai Liu, Yu Zhen Liu
Abstract: This paper puts forward a new dynamic round-robin (DYRR) packet scheduling algorithm with high efficiency and good fairness. DYRR algorithm introduces dynamic round-robin concept, that is, the allowance given to each of the flows in a given round is not fixed, but is related with the number of bytes sent of this and other flows of the last round scheduling. The time complexity of the DYRR algorithm is O(1). Results from performance simulation analysis shows that DYRR algorithm can effectively smooth output burst, realize fair scheduling, and have a good time delay characteristic.
Authors: C.A. Koh, J.L. Savidge, C.C. Tang, R.E. Motie, X.P. Wu, R.I. Nooney, R. Westacott
Authors: Yao Ting Zhang, Yi Zheng, Hong Jian Li
Abstract: A dynamic test of two unbonded fully prestressed concrete beams has been conducted. The results indicate that the natural frequency of beams increases with the prestress force, which is opposite to the analytical arguments for homogeneous and isotropic beams subject to axial force. This paper explains the change in frequencies by discussing the change in the elastic modulus. A modified formula is also proposed, and the experimental data agree well with the theoretical analysis.
Authors: Hong Zhen Xu, Bin Tang, Ying Gui, Huai Ping Wang
Abstract: Workflow technology has emerged as one of those technologies designed to support modeling, designing and executing business processes. One of the major limitations of current workflow management systems is the lack of flexibility to support dynamic management of workflows. In this paper, we propose a dynamic workflow management model based on web services. We integrate web services and ontology technologies to support dynamic specifying, monitoring, analyzing, designing, configuring and executing workflows. We explain the need and functionality of the main modules and interfaces of the model, and introduce its application in a case study. An important feature of this model is to support for planning and adaptive workflow management.
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