Applied Mechanics and Materials Vol. 440

Abstract: In this paper, a theoretical analytic model of the broadcasting protocol which has been adopted for vehicular communications is proposed to analysis the relationship between the throughput and the reliability, and to find suitable CW value which can optimize the throughput and reliability of broadcasting protocol, the multi-object optimization Models is proposed to explore how to adjust the Throughput-Reliability Tradeoff. The analysis results show that it is possible to gain an extra level of reliability at the expense of some throughput by adjusting CW.

Abstract: In order to keep pace with the development of IEC61850-based intelligent and digital power grid technology, a high-performance communication network must be configured in the process of electrified railway traction substation digitization to achieve the various functions of the substation automation system (SAS). First of all, the structure of communication network in a digital traction substation and the category of different data flow in it are analyzed in this paper. Secondly, the part of packet end-to-end delay (ETE Delay) is specifically discussed. In the last place, by using OPNET, a dynamic network modeling and simulating software, the networks both in substation level and process level is simulated and researched. The results show that the network built in this article can meet the real-time requirements of IEC61850.

Abstract: Node self-positioning is one of the core technologies in wireless sensor networks and is the premise of many applications. It is significant to achieve highly efficient and reliable node localization for event observation, target tracking and efficient routing. The DV-Hop localization algorithm which is one of the Range-Free algorithms is researched deeply. Firstly, algorithmic process, error sources, and the amount of communication and computing for Traditional DV-Hop algorithm are analyzed. For low positioning accuracy in Conventional DV-Hop localization algorithm, an improved DV-Hop localization algorithm based on estimate of average hop distance, Min-Max and position correction is brought forward. The simulation results show that the improved algorithm can improve the positioning accuracy more effectively without increasing hardware consumption in nodes comparing with conventional DV-Hop algorithm. So it is a practical and effective node localization method in wireless sensor networks.

Abstract: Applying SQlite database and ZigBee technology to the development of the smart supermarket shopping guide system and by prompting customers the target area and locating the real-time position of them, this paper solves the problem that customers can't find target goods quickly in large supermarkets. When customers want to search target goods quickly, firstly the monitor terminal installed in a shopping cart queries SQlite database table to obtain the position of the target area and display it on the electronic map, then it locates the real-time position of customers by ZigBee wireless network and refreshes coordinates of customers constantly. According to the electronic map, customers can go to the target area quickly and find the target goods easier.

Abstract: This paper has developed a double-ball exercising device for table tennis and described its basic structure, working principle, processing, technical requirements, operation and application to solve the problems in device and technical practices for teaching and training of table tennis. With help of the device, athletes could quickly master essential skill and the effect of teaching and training markedly was enhanced.

Abstract: In this paper, design the rolling and coordinate type device of table tennis and describe their basic structure, working principle, processing, technical requirements, operation and application to solve the former problems of device and technical practices. With the help of the devices, players can quickly master essentials to make teaching and training significantly enhanced. Such devices have not been reported.

Abstract: In recreational scuba diving, vital equipment is the weight belt which consists in a resistant belt where blocks of lead are fixed for floating balance and for release so that in emergency cases it is possible to rise to the surface more easily. However in some obese divers, because waist circumference is bigger than the hip, the equipment may accidently slipping down the legs causing traumas and even death. The equipment cant also be fixed in a permanent way in the dives body, because in emergency cases its intentional release may be necessary. There are buoyancy compensator vests with integrated weights, which would solve the problem, but they are too expensive. Therefore a safety device applied in the weight belt was developed for recreational diving to be used by obese divers. The device was successfully validated with 10 obese divers who had difficulty using the weight belt and a patent was requested.

Abstract: This project aims to investigate the effect impacting a high speed golf ball on TiN coated metal plate, a simulated golf club head. It was found that the surface coating caused greater deformation of the golf ball. It can be said that a club with this coating will absorb less energy from the impact. The result of this is that the energy will that was not absorbed by the club threw deformation will remain in the golf ball. This extra energy will be transformed into two forms of kinetic energy. The other will be used up by the forces acting on the ball during flight. This research is important as large golf club and golf ball companies have great interest and motivation to further their understanding of new ways to improve their golf clubs.

Abstract: Based on literature review and logic analysis, we sorts out golf equipment including golf apparel, golf clubs and golf balls in this paper. We also describe the detailed evolution process of the related golf equipments, which will give people a comprehensive understanding of golf development. Another objective of this paper is to popularize golf culture, and give a guideline for the development of the domestic golf equipment market.

Abstract: The table tennis racket has played an important role in the development of promoting the table tennis. This paper will analyze the influence of the change of the racket baseplate on the table tenniss technological development, and various requirements on the performance of the racket baseplate by different table tennis batsmanship, and conclude the mutual promoting and influencing relationship between the materials of the baseplate of table tennis racket and the batsmanship, and then to coordinate the baseplates performance and the technology of the table tennis athletic, and to maximize the techniques and tactics levels of the athletic.