Applied Mechanics and Materials Vols. 635-637

Abstract: Infrared imaging simulation is important in national defense, military affairs, aviation and aerospace etc. A method of infrared imaging simulation is proposed based on Vega sensors, in this paper. The 3D model of air target with a visible texture was built with the software Creator. Then infrared texture was mapped to get by the tool TMM and atmosphere conditions were modeled in MAT and infrared image was simulated using Vega sensors. Finally the emulational infrared image is corrected using infrared imaging instrument and the measure instrument of infrared radiation on the surface of objects based on the above results.The experimental results show the method of infrared imaging simulation is effective and valuable in engineering application.

Abstract: For the low contrast and serious noises, a fast image segmentation method based on one-dimensional gray segmentation, binary morphology erosion and area elimination is proposed. Since veins are thin and long, the vein image can be easily distinguished from background by judging the gray difference from nearby pixels when they are vertically or horizontally scanned. Then the processed image is diposed with erosion and area elimination to filter the noise. According to test results on the hand vein images which got from the equipment constructed by ourselves, it is proved that the method is more suitable for hand vein image segmentation than others and clear vein images can be botained quickly.

Abstract: Key and difficult points of background subtraction method lie in looking for an ideal background modeling under complex scene. Stacking the individual frames as columns of a big matrix, background parts can be viewed as a low-rank background matrix because of large similarity among individual frames, yet foreground parts can be viewed as a sparse matrix as foreground parts play a small role in individual frames. Thus the process of video background modeling is in fact a process of low-rank matrix recovery. Background modeling based on low-rank matrix recovery can separate foreground images from background at the same time without pre-training samples, besides, the approach is robust to illumination changes. However, there exist some shortcomings in background modeling based on low-rank matrix recovery by analyzing numerical experiments, which is developed from three aspects.

Abstract: The design of an analog laser diode (LD) driver for 5GHz radio-over-fiber (ROF) transmission systems is presented in this paper. The proposed linear LD driver adopted a single-ended two-stage amplifier structure with the operating voltages of 1.8V and 3.3V respectively. The technique of self-biased cascade amplifier is employed to increase the gain and alleviate the danger of gate oxide breakdown. The simulation results show that the analog amplifier achieves the power gain of 35dB and the output 1dB compression point of 18dBm at 5GHz. The corresponding output modulation current is up to 50mA at the 1dB compression point. The total chip area is only 710μm×580μm with the all on chip input and output matching network, and the power consumption is 130mW.

Abstract: With the development of DSP technology and improvement of computer hardware performance, software radio technology has been widely applied in the area of satellite communication. Digital carrier monitoring system is a new type of satellite communication spectrum monitoring system. It is based on software radio technology and is networked design, having realized functions of spectrum remote monitoring and networked virtual instrument. This article analyzed functions and working principals of this system, and summarized its application in earth station.

Abstract: Diminutive devices of present and future microprocessor generations are drawing increased attentions for transient errors. To address reliability issues, fault tolerance mechanisms must be taken into consideration. In this paper, we involve Reliability Station (RS) into modern superscalar out-of-order data path. In our proposed mechanism, each instruction in the pipeline will be executed twice and the dual results are stored in RS before they can be used. The fault detection is completed by a comparison between the two results and the recovery is achieved by re-executed the corresponding instructions. The simulation results of 12 benchmarks chosen from spec2000 and mibench show that the performance loss of our solution ranges from 30.29% to 83.32% with an average of 54.90% compared to single instruction execution, which is lower than that of Double Instruction Execution (DIE) schemes with an average of 78.42%. Meanwhile, due to the high efficiency of the recovery, our mechanism will exhibit better performance and power efficiency than DIEs within high transient error rates.

Abstract: Multi-scroll chaotic attractors’ synchronization technology is one of the important research achievements in recent years.This paper uses driving-response synchronization method to achieve the two 6-scroll chaotic attractors’ synchronization in the four-dimensional syetem.The feasibility of this method is proved by theoretical analysis and numerical simulation.

Abstract: OFDM is a key modulation and multiplexing technique. The basic system structure of OFDM is introduced firstly. This paper chose appropriate implementation schemes for channel coding, PAPR(Peak To Average Power Ratio) reducing and synchronization of the OFDM system based on the minimum BER(Bit Error Rate). Finally, the paper realized the simulation and got the BER in different SNR(Signal To Noise Ratio) in the matlab environment .

Abstract: Constructing efficient, convenient and cozy home environment has become the current hot spot by using Zigbee wireless communication technology. This paper simply introduces ZigBee technology including the architecture and network topology of Zigbee2007/Pro protocol stack firstly, and then proposes a design plan of a remote supervisory control system based on Zigbee2007/Pro protocol stack for smart home applications and shows the hardware and software design of the system. This system uses ZigBee Wireless Technology to build home internal network, and connect a variety of sensors and home appliance controller to Zigbee network node. Various signals collected by a few end-nodes may be delivered by this system to the main control module, which will analyze and process them. Then the main control module transfers this information to internet or cellphone through the Ethernet and GSM/GPRS network to remotely and locally monitor and control family inner environment and household appliances. Furthermore, the working condition of the system can be traced into the SD card.

Abstract: In the optical fiber communication system of high-speed and large capacity, the dispersion is one of the main technical indicators. The dispersion causes the light pulse broadening, so it leads to the distortion of signal transmission and BER (bit error rate). The main research is the single-mode optical fiber dispersion compensation. The design and performance of system structure on the dispersion compensation fiber communication system is accomplished by using of the optic system optical fiber communication system simulation. Through the analysis of system structure and the research of the performance of the key components of the system, the output signal waveform is simulated and the influence of the output signal waveform by the system structure and key components performance of the receiving end is compared. The design can reduce the system dispersion.