Advanced Materials Research Vols. 765-767

Abstract: Website structure was described as an un-weighted digraph. The concept of website navigation cost as a measurement scale to evaluate the optimization degree of the website structure was presented. Based on the ideas of semantic similarity and information entropy, a quantification model of the website navigation cost was built up. And an improved Path Tree Spanning Algorithm was proposed to construct all the access paths of the website. Case study shows that the approach introduced in this paper can not only bring the new ideas and methods to the website structure optimization, but also provide further support for the website designers to develop optimization design of the website.

Abstract: The explosive growth in data quantity today, massive data query performance is good or bad becomes important. In order to avoid system response time is long, wasted resources from happening. We are actively exploring methods and strategies to make massive data query performance optimization. Massive data query performance optimization is a systematic project, involving many aspects, in which the index plays an important role. This article obtains from the index, based on Oracle, the paper analyzes the structure of B-tree index, the way of data scanning, as well as how to correctly use the index and rely on the index attribute to optimize massive data query performance.

Abstract: ROP (Return-Oriented Programming) is a kind of attack technique which makes use of the existing binary code of target systems. ASLR (Address Space Layout Randomization) is widely used to protect systems from buffer-overflow attacks by introducing artificial diversity to software. With ASLR software can be immune from ROP attacks to some extent. Due to the fact that ASLR cant randomize base addresses of executables code segments and its utility on 32-bit architectures is limited by the number of bits available for address randomization, attackers can successfully exploit a target system by using brute force in limited time. Thus, we proposed FLR, a function level randomization technique to mitigate ROP attacks. FLR randomly permutes functions in executables, making attackers assumptions on executables incorrect. We implemented a prototype of FLR and randomized ten executables. ROP attacks succeeded without FLR and failed with FLR.

Abstract: Multiple description codes are designed for multiple path video streaming with channel diversities and an efficient MDC technique based on the applied spatial domain processing features. In this paper, we investigate the performance of multi-path video streaming using a multiple description coding (MDC) technique, especially the impacts of several codec variables, such as different lengths of the Group of Pictures (GOP), and the different startup times of I-frame in each independent MDC sub-streams. The overall performance of the system is evaluated by the frame dropout rate, which indicates the probability of playing back frozen frames of the reconstructed video at the receiver devices. To address dynamic channel conditions for video transmissions, we propose an adaptive coding technique by adjusting the GOP lengths according to the channel condition and combinatorial mathematics optimization in length of GOP adjustment. Different approaches, such as sub-dividing GOPs for a single stream and multiple sub-streams, and an adaptive MDC video streaming system, are examined in this paper.

Abstract: This paper firstly describes the medical information with the rapid development of new medical reform, with the popularity of the 3G network, the mobile remote emergency custody has gradually developed in all the country.Then for the usual remote emergency cares business processes were introduced, and describes the function about remote emergency care business in the ambulance, first aid center and the hospital side, leads to the emergence care in the wartimes significance is larger than it in normal. For remote wartime emergency care, analyses from the first aid center, ambulance and first aid scene, the scene PAD terminal and hospital.Finally concluded that need to enhance related functionality and roles of the wartime remote emergency care, for meet the high requirements of wartime emergency care, 3G high-speed networks, telecommunication security encryption, integrated multi-system, data standards harmonization is a highly efficient and reliable for the wartime remote emergency care.

Abstract: The composition, solution, method and design idea of crop information acquisition device applying internet of things were introduced. The applications of internet of things in crop production research were explained, and several technological difficulties and methods were discussed. Meanwhile, the effect and significance of applying internet of things in relevant disciplines of agricultural production were demonstrated.

Abstract: This article describes a Linux-based meter reading concentrator software design; include software module division and the main task flow. In this paper, the optimization of the concentrator software and Linux systems integration, improve the concentrator software system reliability, portability and scalability.

Abstract: New broadband mobile IP bearing network technologies based on ID/Locator separation solve the four questions security, mobility, routing scalability and network integration. As the main direction of mobile Internet and telecom broadband network integration, the research of the overall architecture and key evaluation methods of the mobile Internet and broadband network integration is used to guide other research directions. This article reviews the related studies of the integration and evolution, as well as the related key technologies and new equipment/system, to development the application platform and construction to complete scientific research achievements of the ground and presentation.

Abstract: On the basis of network application, the content-based video retrieval processes and the relevant algorithms and implementation techniques are analyzed in this paper. According to the characteristics of the network video, the comprehensive color and shape features of retrieval technology is put forward. Then from the perspective of network applications, the distributed video database retrieval system architecture design is given. This paper has carried on the comprehensive analysis at the aspect of the system database structure and the network structure, combined with the three-tie network system structure, in the network application environment, how to realize the content-based video retrieval technology has carried on intensive study and discuss.

Abstract: Firstly, possible pipe combination, that needs to give friction factor value, is found by orthogonal experimental method. Then friction factor sensitivity of pipe section is analyzed in the possible pipe combination by sensitivity analysis, supplementary boundary conditions is gotten, friction factor value of every pipe is given according to solving analogical node equation method. At last, Case study showed that the method is true and better in result matching and convergence rate aspect. The approach is a theoretical guarantee to network design and optimal analysis of oilfield water injection network, and has a specified engineering significance.