In recent years, the world has witnessed the deployment of several 3G and 3.5G wireless networks based on technologies such as CDMA 1x EVolution Data-Only (EVDO), High-Speed Downlink Packet Access (HSDPA), and mobile WiMax (e.g., WiBro). Although 3G and 3.5G wireless networks support enough bandwidth for typical Internet applications, their performance varies greatly due to the wireless link characteristics.We present a measurement analysis of the performance of UDP and TCP over 3G and 3.5G wireless networks. The novelty of our measurement experiments lies in that we took our measurements in a fast moving car on a highway and in a high-speed train running at 300 km/h. Our results show that mobile nodes experience far worse performance than stationary nodes over the same network.
This paper is to realize an electric power generator utilizing wave force through hydraulic mechanism. The wave power generator using hydraulic mechanism is very useful since it produces energy in the ocean. This experiment used a check valve, oil pressure tube, and generator to embody the wave power generator through hydraulic mechanism. Check valve was used to make the fluid flow in one direction, and oil pressure tube for the movement of the fluid. The volume and pressure of the fluid in the structure were calculated. The factors which affected the volume and pressure of the fluid in the structure were analyzed. And the results from this study shall be applied to the actual marine construction, and utilized in the research for the reinforcement of the structure.
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