Advanced Materials Research Vols. 457-458

Abstract: To reduce the complexity of AVS sub-pixel motion vector search, this paper proposes a new improved algorithm based on little diamond window searching policies according to the law of the general video sequence motion vector focusing on the near of the initial searching point at the time of the subpixel motion estimation on the basis of deeping analysis to HFPS algorithm. Comparing with the sub-pixel HFPS algorithm search algorithm, the time of sub-pixel motion estimation can reduce 51.97％ on average and efficiently decrease the computational number of sub-pixel motion estimation on average PSNR lost less than 0.01dB to the video sequences with different motion characteristics.

Abstract: In order to evaluate the air-to-surface missile bearing-only attack effect u, the paper introduces a method which is based on EspCreator platform to develop the virtual reality simulation system. The 3D geometric models of the sea view、fighter plane、 air-to-surface missile and the target battleship are established by the 3D Max. The visual simulation of ASM Attack under bearing-only target indication is developed on the EspCreator simulation platform. The shared memory technology is applied in visual scene parameter driving and the technology of integrating DirectX API into scene loop is applied for the real-time simulation of the radar beam. The simulation system can modify the parameters easily and intuitive display simulation results. It’s a new convenient approach for research and evaluation of the weapon application simulation.

Abstract: The conventional perturbation and observation (P&O) method is combined by the target tracking technique of data fusion, the adaptive multi-mode MPPT control algorithm is put forward for the first time. The reasonable and long step is selected to insure tracking velocity, the target tracking algorithm is adoptted for weaken and restrain vibration, the target maneuvering detection technique is put to use to judge whether the system is “lose control ” in fast variation environments, the repeat starting up perturbation and observation (P&O) method in order to strengthen system stability .The experimental result shows the correctness and validity of the method.

Abstract: Fatigue failure of machine components occurs when cracks form in the stress concentration area and propagate under continued loading during component work. In order to understand the relation between the phenomena of stress concentration and crack propagation, non-destructive evaluation methods using in-situ measurements in the stress concentration areas are necessary. In the present work, a scanning Hall probe microscope (SHPM) equipped with a GaAs film sensor was developed and the three dimensional magnetic fields were observed at room temperature in air. The effect of stress on the changes in the magnetic field in steel components is reported. A steel specimen (JIS SKS93) embedded in acrylic resin were strained at different loads and the magnetic field before and after straining were observed. The obtained magnetic images clearly corresponded with the shape of the steel plate. It was possible to measure the changes in the magnetic field of the steel sample after straining under tensile loading, by neutralizing the initial magnetic field of the specimens prior to testing.

Abstract: Software fault tolerance makes system complicated by means of diverse fault-tolerant mechanisms. Aspect-oriented programming has been confirmed as a well suited candidate to ease the problem. However, most of the existing works only focus on implementation level. This paper proposes an AOFTM model for aspect-oriented fault tolerance modeling with Coloured Petri nets at design level. Moreover, the weaving mechanism formally defined conducts the way to derive a woven net from AOFTM. A case study presents how AOFTM works, and its properties are analyzed using the CPN Tools.

Abstract: Using different thickness of pure nickel as interlayer, hot isostatic pressing (HIP) diffusion bonding between TC4 prealloyed powders and GCr15 bearing steel have been performed at the temperature of 850 °C, under pressure of 150 MPa for 2 hrs. The diffusion bonding joints gained have been observed and analyzed by optical microscopy, electron microprobe and X-ray diffraction. The result of observation by optical microcopy indicates that, at the interface of TC4 and interlayer, many connecting arcs have been formed, and these arcs gradually disappear with thickness of pure nickel increasing. The result of observation by electron microprobe reveals that, during the process of HIP diffusion bonding, nickel atoms have a short diffusion distance in the zone of GCr15, whereas they diffuse a comparatively long distance in zone of TC4. The observation also find that the distributions of elements of titanium, iron and chrome vary in different area of zone of pure nickel, which results in the formation of different type of intermetallics. Thus, the contact of titanium atom and iron atom can be avoided with certain thickness of pure nickel as interlayer. When thickness of interlayer is large than 120 um in this test, the combination of titanium atom and iron atom will be avoided and intermetallics such as TiFe and TiFe₂, are disappeared. These rules mentioned above also have been confirmed by the analysis of X-ray diffraction.

Abstract: Future high-end System-on-chips (SoCs) will be consisted of hundreds of cores integrated on a single chip. On-chip communication becomes the major performance bottleneck of SoCs. Network-on-Chip (NoCs) have become as the most prominent solution to on-chip communication problems. Network topology which affects the total network conformance is basic of network related researches. The objective of topology synthesis is to minimize the power consumption and router resources while satisfying bandwidth constraints. In this paper, we present a two-level genetic-algorithm (GA) based technique to synthesize application-specific NoC topology. Comparing to an existing three-level GA, experiments show that our technique saves 1.8% energy while saving great runtimes of 97.79%. Our technique generates approximate optimal topology less than one minute.

Abstract: Expert system for automobile fault diagnosis is an intelligent system, and its key technologies are knowledge acquisition, knowledge representation and inference strategy. Based on large collection of papers which on abroad or on home, some resolved methods have been presented in this paper, including improving of traditional method such as automotive acquisition of fault rules, combined knowledge representation and inference method diversification, applying of new theory or new technology such as case-base expert system, fuzzy-base expert system, neural network-base expert system and action-base expert system and so on. And then put forward to that intellectualization, cyberization and integration are the future development direction of automobile fault diagnosis expert system.

Abstract: A framework for building EDM collaborative manufacturing system using multi-agent technology to support organizations characterized by physically distributed, enterprise-wide, heterogeneous intelligent manufacturing system over Internet is proposed. According to the characteristics of agile EDM collaborative manufacturing system(AEDMCMS), the agent technology is combined with Petri net in order to analyze the model. Based on the basic Petri Net, the definition is extended and the Agent-oriented Petri net (APN) is proposed. AEDMCM is turned into the model of Petri Net which is suitable to the analysis and optimization of manufacturing processes.

Abstract: The implementation of Voice over Internet Protocol (VoIP) technology is on the increase because of its ability to enhance operating efficiency and reduce infrastructure cost. Voice and data packets traverse over IP networks with fixed maximum capacity. But susceptibility to traffic congestion which results in delay and packet losses is still a major challenge of VoIP technology. Multiprotocol Label Switching Protocol (MPLS) with Traffic Engineering (TE) is an approved standard technology that has the capabilities to minimize network congestion and improve network performance by reducing delay and packet loss to yield a higher throughput. In this paper, we investigate how MPLS Traffic Engineering can be implemented to reduce traffic congestion on VoIP networks.