Applied Mechanics and Materials Vols. 416-417

Abstract: This paper firstly discusses the techniques to optimize power consumption of the embedded operating system, and then optimizes power consumption of embedded Linux by adding DVS (dynamic voltage scaling) module and modifies the scheduling function in the standard Linux kernel. Finally, take a comparison test on arm920 platform. The test results show that: the power optimized Linux can effectively reduce the power consumption of the whole embedded system.

Abstract: The improvements of smart phone performance have made it possible to develop 3d interaction system on the phone, and the android platform has the highest market share of mobile phone platforms. Therefore the development of 3D interaction system on the Andriod phone becomes a unstoppable trend. Based on the combination of three kinds of application development framework, a development framework of the 3D interactive system based on Andriod phone is put forward. And this essay takes the 3d room show as an example analysis of the development framework and proves its feasibility and effectiveness.

Abstract: In this paper, a design of optical fiber sensing alarm system based on, can realize high sensitivity, long perimeter, large range of perimeter protection, convenient installation.

Abstract: Hypothesis combination is a main method to improve the performance of machine translation (MT) system. The state-of-the-arts strategies include sentence-level and word-level methods, which has its own advantages and disadvantages. And, the current strategies mainly depends on the statistical method with little guidance from the rich linguistic knowledge. This paper propose hybrid framework to combine the ability of the sentence-level and word-level methods. In word-level stage, the method select the well translated words according to its part-of-speech and translation ability of this part-of-speech of the MT system which generate this word. The experimental results with different MT systems proves the effectiveness of this approach.

Abstract: Cooperative diversity technique refers to that in the context of multi-users, several single antenna terminals create a virtual multi-antenna system to realize the dispatch and diversity of the periodic line by means of share each others antenna. The remarkable strong point of the cooperative diversity technique is that it can reduce the transmission power of the system, improve its handing capacity and effectively decrease its error rate. This paper is going to analyze the application of the cooperative diversity technique on the wireless communication technology and present the main problems of the cooperative diversify technique by introducing the related conceptions of the cooperative diversity technique.

Abstract: With the rapid development of mobile communication, the demand for the security and reliability of mobile communication becomes increasingly higher. The major operators are all continuing improving the operation mode in order to reduce operating costs to achieve maximum economic benefit. If the development demands are to effectively unify, they can be accomplished through the advanced network technology and switching technology. The following will explore the application of Soft-Switch Technology in mobile communication according to the authors work experience and professional knowledge. There are many shortcomings, and I also hope for criticism.

Abstract: In the wireless mesh networks, identification of nodes does not need to set the address, only take the manufacturing time of the node as the sequence to identify. Nodes in the query and data transmission adopt a master - slave mode. The center node initializes slave-node according to the node of the manufacturing time sequence, through the search command, search to find the slave-node. The newly found node recursive search is for the next batch of nodes. Eventually form a wireless mesh network. Center nodes and the nodes of data communication are made by mesh network.

Abstract: As a basic problem of wireless sensor in network applications, coverage reflects the quality effect of monitoring and tracking of the network. In view of the high density of sensor nodes deployment, this article works on the node set selection problem, puts forward two kinds of coverage optimization mechanisms based on weighted genetic algorithm and constrained genetic algorithm according to the genetic algorithm operation of the fitness function generation, and calculates approximately optimal working nodes required in the sensor network fully covering area. The simulation results show that the algorithm can quickly converge to the optimal solution and complete the optimization of node set selection, thereby reducing network redundancy and prolonging the survival time of the network.

Abstract: At present, technology related to GEO is wide used in the civil and military fields. In this paper, firstly, the generation of GMR-1 was introduced and then a detail illustration of how to comprehend the GMR-1 system and its structure was made by comparison between GMR-1 specifications and GSM standard. These two specifications were compared in terms of the physical channel, logical channel, bursts, mapping and so on. The analysis indicates that GMR-1 modified the lower layers for the satellite channel. In the end, we are looking ahead to the future of the GMR-1.

Abstract: Computer network is the virtual world in which various computers and external equipments with independent functions are connected through communication line in different geographical positions. At present, the application of communication technology is mainly represented by digital telephone switching technology, optical fiber communications, satellite communications and intelligent terminal, while individual communication covering the globe is the development direction of communication technology. The thesis first of all makes an introduction of the characteristics of computer network, followed by an analysis of the application functions of communication technology and study of combined function of computer network and communication technology, so as to inspire the follow-up studies.