Advanced Materials Research Vols. 179-180

Abstract: The aim of the present experiment was to investigate visual attentional allocation of top-down and bottom-up cues in three-dimensional (3D) space. Near and far stimuli were used by a 3D attention measurement apparatus. Two experiments were conducted in order to examine top-down and bottom-up controls of visual attention. In the experiment 1, the cue about the location of a target by means of location information. In the experiment 2, color cue by brief change of color at target locations was presented. Observers were required to judge whether the target presented nearer than fixation point or further than it. The results in experiment 1 and experiment 2 show that both location and color cue have the effect on reaction time, and that shift of attention were faster from far to near than the reverse. These findings suggest that (1) attention in 3D space might be operated with both location and color controls included the depth information, (2) the shift of visual attention in 3D space has an asymmetric characteristic in depth.

Abstract: To make the parallel hybrid electrical vehicle (PHEV) equipped with automatic mechanical transmission (AMT) shift without disengaging clutch, the speed and the torque of the engine and the motor must be controlled precisely and reasonably. Because the engine and the motor all equipped before the AMT, the input shaft moment of inertia of the transmission is great. To ensure the synchronizer of the transmission disengage with a small force and reduce the tooth wear of the synchronizer, we must control the torque of the motor based on different conditions to make the AMT work with small torque transmission before shifting. In view of the uncertainty and complexity of the system, we use ANFIS method to determine the target torque of the motor to make sure the synchronizer disengages with the transmission transferring little torque. Finally, we make a vehicle simulation carried out by the software “cruise” and prove that the method is feasible.

Abstract: Inspired by the potential interesting ideas of the danger theory, a novel security evaluation paradigm for network security, it is called DTPSE, is proposed in this paper. Within DTPSE, computer network attacks are regarded as bacterium, which are dangerous, and induce danger signals through simulating cells undergoing injury, or stress or 'bad cell death'; the network evaluation centre can dynamically aware the security risk by fusion the danger signals received from host-based sensors. Theoretical analysis shows that the proposed paradigm is feasible. Thus, it provides a novel solution to information security risk assessment.

Abstract: Because of high wear resistance and low cost, high chromium cast iron liner plate is the most commonly used liner for HZS series concrete mixing station at present. However, in normal operation, the high-chromium cast iron liner produced by conventional casting process is easy to crack at its corners. We found that the cracking reasons of this type of liner plate are mainly the lower cast impact toughness, slightly higher hardness, and there has not gotten a good matching between the hard particles and the matrix organizations. Thus we used the secondary heat treatment to slightly reduce the hardness and increase the impact toughness of cast iron liner plate, which can improve the wear resistance and impact resistance of the liner material to extend the service life of these cast iron liners.

Abstract: Passive radar based on GSM is a hot research field of new illuminators passive radars, and the wave arrival direction estimation is the key problem for detecting target. This paper designed adaptive antenna array for the GSM passive radar system, and give the complete Matlab simulation to verify the execution of the schedule, meanwhile, the result shows that the MUSIC algorithms is high accurate in the wave arrival direction compared with the Capon. All of this made a useful contribution to the research and application of the GSM-based passive radar.

Abstract: this paper designed and developed a car tyre leakage detective system based on the mechanism of supersonic produced when a car tyre leak, by adopting DSP TMS320LF240X MPU technology of TI company. This system is very valuable in detecting the running car tyre leakage in time to enhance the security, experiences shows it’s with high reliability and performance.

Abstract: H.264/AVC standard has been widely used in video compression at various kinds of application domain. Motion estimation takes the most calculation workload of H.264/AVC encoder. Memory optimization has played an even more important role in encoder design. Firstly, dependency relation between motion vectors was analyzed and removed at a little cost of estimation accuracy decrement, and then a 3-stage macro-block level pipeline architecture was proposed to increase parallel process ability of motion estimation. Then an optimized memory organization strategy of reference frame data was put forward, aiming at avoiding row changing frequently in SDRAM access. Finally, based on the 3-stage pipeline structure, a shared cyclic search window memory was proposed: 1) data relativity between adjacent macro-block was analyzed, 2) and search window memory size was elaborated, 3) and then a slice based structure and the work process were discussed. Analysis and experiment result show that 50% of on chip memory resource and cycles for off chip SDRAM access can be saved. The whole design was implemented with Verilog HDL and integrated into a H.264 encoder, which can demo 1280*720@30 video successfully at frequency of 120MHz under a cyclone III FPGA development board.

Abstract: This paper discussed an integrating manufacturing execution system in pressure vessel industry. MES optimizations (MESO) is a reliability growth process which is applicable to manufacturing firms to unify the supply chain plan, the service and the production automation, transferring the company's service goal to the definite operation goal and realizing the multi-varieties, multi-batch, high quality and low-cost of the production demand. This system is a complex operating system which is composed of certain subsystems, and it could complete the specified function. Basing on the MES functional module, this paper has investigated on the enterprise productive plan and scheduling module to realise the reliability growth and product quality improvement as well as some key technical strategies. Combined with the quantitative evaluation and analysis method of the reliability engineering, the paper also made an analysis for the numerous resources entity and functional module of the overall system and formed a research subject on the theory relative to the reliability growth of the MES. The research on the case has a certain instruction function for the enterprise which is going to put the MES into effect.

Abstract: A new optical instrument for fast measurement of fruit tree nitrogen status was designed and fabricated. Multi-color LEDs were used as light source, a portable spectrophotometer as optical detector, and an optic fiber as light signal transmission medium. In the paper, the principle of using multi-color LEDs for the measurement of fruit tree nitrogen status was first introduced. Then, the method of using error back propagation artificial neural network (BP-ANN) for calibration modeling was elaborated. Reflective light intensities of Multi-color LEDs were taken as the incoming signals to BP-ANN. The structure of BP-ANN with three layers has been optimized to minimize its calibration error. In the test, total 200 leave samples picked from Huang-hua pear trees planted in three orchards with different levels of nitrogen fertilizing. Among them, 150 samples were selected randomly out for calibration set with the remaining 50 for prediction set. The result shows that correlation coefficient of R2 between predicted and measured values of nitrogen content reaches 0.93 with maximum prediction error less than 3.36(SPAD). The study suggests that the new optical method integrating multi-color LEDs with BP-ANN is promising for fast diagnosis of fruit tree mineral nutrition status.

Abstract: In recent years, a flexure hinged micro-displacement platform driven by piezoelectric actuator is being widely used in vibration suppression and micro positioning applications for its fast response, nanometer resolution, no backlash, no friction and bigger driving force. This kind of precision micro positioning system with a high displacement resolution and wide motion range has been required for industrialized applications for a long time. This paper discusses the design and the characteristics of a flexure hinge-based micro-displacement platform driven by piezoelectric actuator, a four-bar parallel mechanism and a monolithic symmetrical mechanism are adopted in the design. An analytical model is presented and a series of formulae for the static behavior of the platform are derived. Based on the theoretical analysis, the optimum design schema is put forward. The experimental demonstration to study the performance of the platform is described, and the method for reducing nonlinearity errors is proposed. The experimental results are in close agreement with those predicted by the theoretical analysis.