Advanced Materials Research Vols. 765-767

Abstract: An Extended Finite State Machine (EFSM) is one of the most popular models used in protocol testing field. A specific graphical EFSM model consists of two parts: state elements and transition elements. This paper presents a method for building a visual EFSM modeling system (VEMS), which is used to construct visual protocol EFSM models for protocol testing. VEMS consists of two main modules. One is the modeling module and the other is the model information analysis module. The function of our system can satisfy the requirements to build a visual EFSM model in protocol testing. Specially, users can modify the properties of states and transitions, change the size of states and transitions, build connection between states and transitions, etc. VEMS provides a good modeling support for protocol testing. Its advantages include friendly user interface, simple modeling operation, model persistence and recovery.

Abstract: To deal with the problem of penetration trajectory planning for UAV security issues, an improved bidirectional quintuple tree node expansion algorithm is proposed. Compare to traditional quintuple tree node expansion algorithm, the proposed algorithm could reduce the number of the expanded tree node, and it makes the bidirectional quintuple tree node expansion algorithm more efficient in path planning. By combining the bidirectional quintuple tree node expansion algorithm with multi-step optimization search mechanism, a kind of real-time UAV path planning algorithm is presented.

Abstract: The key factors of NC gear shaper working steadily are directly influenced by the mechanical properties of reduction gearbox of NC gear shaper .The reasons of the reduction gearbox of NC gear shaper producing vibration have been studied in condition of unstable load when it works based on ADAMS . The speed of shafts and the meshing force of gears are obtained from the dynamic simulation analysis by the virtual prototyping technology . It shows that the reduction gearbox of strength of the vibration increases from input shaft to output shaft and the vibration strength which reduction gearbox works in the unstable input speed is greater than that in unstable load torque.

Abstract: Taking a planetary reducer in an electric vehicle as the object of study, a rigid-flexible coupling model was established to perform the dynamics simulation. The variational regularities of the meshing forces, output speed and acting forces of bearings were obtained, and then a finite element analysis of the planet carrier was carried out. This method can not only solve the problem of the boundary conditions of planet carrier which are difficult to define in finite element analysis, but also improve the accuracy of analysis results when the influence of carrier flexibility on the whole system is considered in dynamics simulation, which lays the foundation for further research on reducers.

Abstract: Recoil brake is one of the core components of the artillery. It plays a main buffer role in artillery firing. Its internal flow is very complex, so the traditional one-dimensional computational model can not reflect the characteristics of internal flow field fully and accurately. Two-dimensional computational model of the recoil brake with actual structure was proposed based on dynamic mesh technology. Using dynamic layering method, the movement of dynamic grid was driven by Profile file. The data of Profile file was obtained from experiment measured of artillery recoil. Simulation of the flow field of recoil brake accurately was achieved. Pressure, speed and other data were got by simulation. It also reveals the laws of liquid flow and can provide theoretical support for fault analysis and optimization design.

Abstract: Non-Gaussian probability distribution radar clutter not only is temporal correlated between different pulses, but also is spatial correlated between different range bins. In this paper, the method of simulation and validation of radar clutter is proposed using spherically invariant random processes (SIRP). The amplitude probability function and temporal correlation function of radar clutter can be controlled respectively, and the spatial correlation function can be also specified. The computer simulation of K-distribution and CHI-distribution radar clutter is used to validate the method, and is to validate the amplitude probability function, temporal-spatial 2D correlation function.

Abstract: Different data rate services are expected to support for heterogeneous users in OFDM based relaying networks. And fairness of users is an important factor that cannot be neglected in the process of resource allocation, particularly for users at the cell edge. The traditional proportional fairness (PF) scheduling algorithm provides a trade-off between average throughout and fairness in wireless communication networks. This paper investigates subcarrier allocation problem of Orthogonal Frequency Division Multiplexing (OFDM) aided relaying systems with PF constraint and proposes an efficient PF scheduling priority by using the users channel condition of past scheduling time and current scheduling time more comprehensively and uniformly which can both maximize the system transmission rate and enhance the system fairness no less than traditional ones. The simulation results show the validity.

Abstract: A mathematical model is established in this paper with acceleration data collected by the smartphone-based three-axis gyroscope during standing, walking, falling over and running. The activity of smartphone carriers can be detected according to the data measured by the internal accelerometer within a given time period, which is capable of deciding whether the smartphone carrier is in strenuous exercises or emergency situation. It is also a reliable and practical solution to the identification of activities in the body area network (BAN). Experimental results demonstrate that the model is effective and reliable.

Abstract: In this paper, we propose a fast and optimal adaptive transmit power and bit allocation algorithm, which is called Bisection Searching Level (BSL) for wireless OFDMA systems. The algorithm aims at maximization of data rate under the constraints of total transmit power and bit error rate (BER). BSL is based on water pouring approach, and adopt bisection algorithm to find the water pouring level under discrete bit restriction. Both theoretical analysis and simulation results demonstrate the optimality of our proposed algorithm.

Abstract: The correct basis for early warning of biological disasters is to master the knowledge of biological disasters. In the paper, Analysis Knowledge integration of the idea of biological disasters. Proposed a framework for knowledge integration of biological disasters and Constructing ontology of biological disasters