Advanced Materials Research Vols. 1044-1045

Abstract: Early network development, people more emphasis on network convenience and availability, and ignore the security of the network. With the development of computer network technology, when people run in the network critical business such as banking, when government activity is increasingly networked, computer network security has become a problem that not allows to ignore. In this paper, the existing network security technology to prevent the analysis and comparison, especially to strengthen security measures should be taken in order to do a more in-depth discussion, and describes the future development trend of this research field.

Abstract: To improves tracking drift which often occurs in adaptive tracking, an algorithm based on the fusion of tracking and detection is proposed in this paper. Firstly, tracking object frame by frame via color histogram and particle filtering. Secondly, reversely validating the tracking result based on particle filtering. Finally, relocating the object based on SIFT features matching and voting when drift occurs. Object appearance model is updated at the same time. The algorithm can not only sense tracking drift but also relocate the object whenever needed. Experimental results demonstrate that this algorithm outperforms state-of-the-art algorithms on many challenging sequences.

Abstract: As Web2.0 rapidly develops, B/S structure is increasingly used in applications. Many applications require higher conditions in being real-time. However, due to the limit of applying in communication modes of the B/S structure [1], B/S structure can’t meet the requirement. To solve the problem, solutions have emerged incessantly. This thesis first analyzes the reason of the problem, and tries to review existing solutions. Then performance, advantages and disadvantages are analyzed and summarized subsequently. This thesis mainly introduces the WebSocket protocol of HTML5 standard, and also compares it with polling’s performance. Finally, this thesis discusses the choices of push technology in concrete applications.

Abstract: Aiming at the imaging tasks scheduling problem on high-altitude airship under static conditions, some major constraints are analyzed and described, the constraint satisfaction model is constructed based on two optimization objectives: maximizing the task benefit, and minimizing the energy consumption. According to the characteristics of our model, an improved NSGA-II algorithm is proposed. Finally, the efficiency and feasibility of our improved model are verified in an experimental simulation, the application results and comparison analysis show that the proposed algorithm is effective and feasible.

Abstract: The traditional modeling approach of auxiliary power is the least squares method, however, accuracy of the traditional least squares method is not high in fitting and forecasting, so we introduced segmentation method of least squares model, and consider the impact of many factors on the model ,proposed the improved least square method based on PSO. Application prove this method has a better fitting precision and predicition accuracy.

Abstract: There are plenty of services on distribution communication network. Service classification and characteristics are given in details. Based on the proposed smart service-awareness model multi-agent Qos control model is analyzed. All of these are helpful to meet user requirements on distribution communication network.

Abstract: Based on Pseudo random noise codes of Chinese COMPASS Navigation Satellite System (CNSS), opened access at the end of 2012, space-surface bistatic synthetic aperture radar (SS-BSAR) passive imaging system is investigated. Furthermore, a modified Range Doppler (RD) algorithm that takes direct signal as reference signal in range compression is proposed. The good imaging performance of SS-BSAR system is demonstrated via modified RD algorithm simulation results.

Abstract: A FSS-absorber radome with both transmissive and absorptive bands is proposed in this paper. The transmissive band is at X band and the absorptive band is at K band. The radome consists of periodical FSS-Absorber units. Each unit has two layers laminated on a substrate: a metallic layer working as frequency selective surface (FSS) and a resistive layer realizing the absorber function. Firstly, the FSS-Absorber unit is carefully studied. Then this radome-antenna array configuration is researched and simulated. The simulated gain, monostatic RCS and bistatic RCS results of a radome-4x4 patch antenna array model are compared with these simulated results of a 4x4 patch array model. These results indicate that the radome is transparent in its passband and can largely absorb the incoming electromagnetic wave in its absorptive band. The radome can be easily realized in engineering.

Abstract: Aiming at the problem of multi point (32 and above) EFPI optical fiber gas sensing system in processing data, for instance, weak ability of parallel data processing, low computational efficiency, slow system response etc., this paper utilizing the advantage like maximum concurrent and distributed of membrane computing system studied a method of parallel data processing. This method adopted a algorithm called Bio-inspired Algorithm based on Membrane Computing-BIAMC compared to the commonly used Genetic Algorithm (GA) has less computational cost and higher computational efficiency. Firstly,4 Standard constrained functions was used as test and contrast function and then the improved algorithm is applied to the parallel data processing, to validate the quantitative analysis and effectiveness, in the end, through the simulation to verify the superiority of the algorithm in robustness and accuracy. The experimental results showed that with taking the parallel feature of data input into consideration the BIAMC which applying to EFPI optical fiber gas sensing system have improved the speed of data processing and the utilization rate of hardware system and the response time of whole system compared to the traditional serial processing method, which provided a new method of parallel data processing in multi-channel sensor system.

Abstract: Dynamic IR image generation of space target is one of the key technologies in hardware in the loop simulation for the infrared imaging guidance system. The three-dimensional entity model is created in the Creator, Sinda/Fluint is used to analyze each part of dynamic infrared radiation characteristics from on-orbit Space Target, on the basis of the LRS infrared star catalogues, celestial background modeling is built. In Vega, the dynamic IR image of space target is generated. The simulation results show that the dynamic IR image of Space Target provide the important objective basis for the hardware in the loop simulation for the infrared imaging guidance system.