Applied Mechanics and Materials Vols. 268-270

Abstract: Data aggregation is an important method to reduce redundant transmissions in wireless sensor networks (WSNs). Authors proposed a secure data aggregation scheme for WSNs based on one-way function. The aggregators completed data aggregation, identity authentication and integrity checking without decrypting the cipher-text and ensured the privacy of transmitted data. Compared with related scheme, the proposed scheme has higher security in terms of resilient against active attack, node compromise attack and reduces the energy consumption effectively.

Abstract: The simulation of the pattern has been an important part in embroidery, which can estimate the field of application of the stitches effectively and save the raw material before embroidery. This paper proposes a new simulated algorithm of contour extraction and image filled for embroidery patterns based on LOG(Laplace of Gaussian)operator. The experimental results show that the algorithm can achieve the expected effect.

Abstract: This paper focuses on the problem of adaptive resource allocation for the web-based GIS. The paper considers the multi-user condition and provides an optimization problem for a general utility function such that it could be nonconcave and nondifferetiable. To solve this problem, the paper decomposes the original optimization problem into the dual optimization problem, which can be easily solved by a simple iterative bisection algorithm to adaptively allocate the network resource through the web-based GIS.

Abstract: Software direction have been with us in many forms within Project developing community such as logic, experiences, domain expertise, laws, project developing principles, rules, design innovative thinking, conception, experimental results, programming rules, experience, observations, skills, algorithms have played major role in software development. This paper presents a new rule known as Direction Based Project developing where the aim is to learn from well known experience and filing newly developed and successful experience as a logic based when building software systems across the life cycle.

Abstract: Aircraft communication and satellite link handoff issues in spatial information network are very important and are focused in this paper. The simulation modules of satellite network nodes and links in network simulator version 2(NS-2) are analyzed in details in this paper. A method of extending NS-2 kernel module is proposed based on analysis of satellite network simulation principle and approach. As an example, the aircraft communication simulation module is designed and implemented. Simulation results show that flight of aircraft has effect on the link handoff characteristic, and show that the proposed extension method is feasible.

Abstract: In this paper, we propose a vague words retrieval method over text field of relational databases. This method is expected to get an ideal retrieval result from text field of relational databases when a set of incorrect keywords is submitted. The solution to this issue is: to create a “hot words library”, then let the input incorrect keywords match with the word of “hot words library”, based on the modified dynamic programming algorithm of k-difference approximate string matching. Finally, Experiments show that this solution has a good query performance.

Abstract: Underwater wireless network (UWN) has been considered as one of the very important technologies for underwater communication, which widely used in scientific research, environmental survey, commercial, military domains, etc. But underwater environmental is complex, water is a worse communication medium than the air, and time-varying in nature. Thus, it is necessary to explore higher communication and network intelligence such as cognitive radio (CR) in UWA. In this paper, a novel environment-adaptive CR-based UWA is proposed. Furthermore, the design of network architecture, cognitive system processing cycle and model of node module are described and discussed.

Abstract: According to the traffic regulating method and the traffic scheduling method of QoS control methods, this paper regulates traffic using the fractal regulator and proposes the arrival curve according to the output envelope of the fractal regulator. In addition, we put forward the service curve based on Enhanced Transmission Selection (ETS). Finally, we drive the deterministic bounds on performance of the self-similar network using the arrival curve and the service curve based on network calculus. These bounds have reference value for QoS guarantee, admission control and network planning.

Abstract: Industrial computed tomography (ICT) is an advanced non-contact non-destructive testing technique and plays a key role in many fields. Low imaging efficiency is one of the drawbacks of ICT towards engineering applications. In this paper, we report the design and realization of real-time three-dimensional Visualization System for ICT based on visualization toolkit (VTK) and the graphics processing unit (GPU) technique. It greatly improves the imaging speed by developing the new techniques in three aspects such as image reconstruction, data compression and fast volume rendering with GPU and VTK. It will find applications in three-dimensional ICT systems.

Abstract: The article introduces implementation and application of management software of commercial vehicle’s technical performance database. This system orients to 4 types of user (commercial vehicles management departments, test stations of multiple performance, vehicle repair enterprises, and vehicle transportation enterprises). The system has imported many thousands of records and realized 3 provinces of technical conditions database’s interconnection and also has been applied in the 3 provinces for months. Vehicle model database can solve the problems which troubles test stations and repair enterprises for many years. The system can raise safety of vehicles and reduce the probability of occurrence of traffic accidents.