Advanced Materials Research Vols. 271-273

Abstract: According to mobile Ad hoc networks’ self-organizing, multi-hop and dynamic changed topology, these characteristics made it impossible that the technology of traditional wire networks were directly used in Ad hoc networks. In Ad hoc networks, the mobility of Ad hoc node is one of the main reasons of the packet loss, which led to frequent retransmission timeout and a serious impact on the performance of wireless TCP. Based on IEEE802.11, this paper proposes three improvement strategies of TCP performance based on PMAC, PLM and RLM of MAC layer, integrates their respective advantages, and gives a comprehensive improvement solution as MAC-SS. The simulation results show that MAC-SS on the TCP performance in terms of throughput and packet loss rate is significantly improved with the increasing speed of the node.

Abstract: In order to ensure the safety production of coal industry and improve the security of coal mine power supply system, CAN bus based monitoring and warning system for coal mine high-voltage power supply system is designed. The design requirements and the hardware configuration and its implementation of monitoring and warning system are particularly introduced, including the construction of communication network, the design of monitoring master station, the design of communication tributary station and so on. The practice shows that this system can ensure the security of coal mine power supply system.

Abstract: There exists a huge social demand for college sports management system software, in order to more conveniently process the increasing sports information, and conform to the trend of scientific management. This study is based on the analytic hierarchy process to divide sports resources into multiple modules. The web-based college sports management system software was developed through such computer technologies as .NET and SQL Server, and equipped with some features like powerful function on dynamic information interaction, and easy installation, operation and use with safety, which can accelerate informationization and networking of college sports management.

Abstract: In this paper a pipelined array of neurons based on the micro-program controller is proposed as the BP network control circuit implementations, without changing the hardware circuit under the premise of the way by increasing the instruction to meet the BP neural network parallel computing applications to enhance the flexibility of hardware.

Abstract: In this paper, A multi-sensor technique integrated tag is presented. This tag is integrated with UHF (920-925MHz) RFID tag, HF (13.56 MHz) RFID tag and magnetic card. This multi-sensor technique integrated tag can meet the demands for application of long range RFID identification, short range RFID identification and payment with insurance or bank.

Abstract: Bachelor thesis is an important part of personnel training, and its quality is an important measure of the quality of teaching level and personnel training. As system construction and improvement being the core, the institutional guarantee system for thesis was established. As strengthening process management being the content, the process monitoring & controlling system for thesis was set up. On the basis of integrating and complementing between the two systems, a quality monitoring & controlling system for bachelor thesis in aquaculture major was built.

Abstract: This paper analyses the hidden terminal and exposed terminal problems on MAC layer which increase the probability of data collision and decrease seriously the performance of TCP based on discussing the problem that TCP faces in Ad Hoc network. Through studying the deficiency of the BEB algorithm, this paper proposes an improved BEB algorithm that called AS-BEB. The AS-BEB algorithms can adjust the size of CW based on the current network status. Comparing with the BEB algorithm, the AS-BEB can improve the performance of the TCP applying in Ad Hoc Network.

Abstract: With the development of computer network and information, digital product is more and more popular. So the problem of protecting the digital product's copyright is urgent and important. Digital watermarking contains the copyright information and authentication information, and protects legal copy and distribution of digital products, which has been the hotspot of international academia. The paper analyze digital watermarking technology, and discuss its various algorithm, point out their characteristic and disadvantages. A good digital watermarking algorithm need to implement blind extraction, robustness and resistance of noise attacks, JPEG compress attacks, geometric attacks etc. In the end, the paper a introduce the current state of this technique and propose several directions of development of digital watermarking at next stage.

Abstract: Modern science and technology is a "double-edged sword". On the one hand, it not only improved competitive sports continuously created new sport items, but also improved the training equipment and training environment, promoted the movement technology and changed the sport values. On the other hand, modern technologies also contributed to the alienation of technology, and weakened the physical fitness activities, and lead competitive sports into deformity errors, which made fair competition become empty, and generated a series of uncivilized unfair social problems. Therefore, we appeal of positive effect of modern technology. In the same time, confront and suppress its negative effects, to ensure that competitive sports may develop in healthy environment under the conditions of modern science and technology.

Abstract: Sports insurance originates in the nature of sports-high risk, and its basic position in the sports industry is determined by its particularity. However, sports insurance in China is only limited to high-risk competitive sports. School sports insurance is still in the development stage. The self-construction of sports insurance and insurance codes are imperfect with few sectors. What’s more, because of weak insurance consciousness of schools and students, unavoidable sports accidents take great pressure to the school, family and the student, which make an impact on the normal operation of schools. Thus it is necessary and urgent to build up and perfect school sports insurance.