Abstract-The growing need for multimedia applications within wireless Local Area Networks (LAN) demands reliable and efficient broadcasting and multicasting transmission of time sensitive data, like audio and video. IEEE 802.11 standard which is the primary technology in wireless LANs was not initially designed to handle this type of data traffic. However, this raises a series of problems mainly related to the lack of an effective feedback mechanism for multicasting and broadcasting transmission. This inherited problem does not allow the standard to take full advantage of the bandwidth offered by its latest amendments. In this paper the expanding use of the CTS-to-Self protection mechanism is proposed in order to improve the performance of an ad-hoc network in a multiple broadcasting environment. The Medium Access Control (MAC) algorithm is appropriately modified and tested under various data traffic conditions. The simulations shows that this expanding use of CTS-to-Self mechanism can improve the performance of multimedia type data broadcasting in a wireless ad-hoc network.
New developments in ultralow power electronic devices can now use much solution to energy harvesting systems designed to interface directly with a piezoelectric transducer. However, these environmental energy sources are typically very low power. Recently, a significant number of piezoelectric devices based on lead titanate zirconate (PZTN) have been designed with the purpose of the piezoelectric transducer. At INCDIE ICPE-CA Bucharest we have realized a piezoelectric transducer for which a PZT+Nb piezoelectric ceramic element was used for low energy source build with piezoelectric circular and linear transducers. Due to their dielectric proprieties and small size, (38 mm x 14 mm x 2 mm), the piezoelectric linear transducers can be optimize the energy harvesting systems applications for which the vibration duration is very short. A multiphysics numerical simulation further illustrates such piezoelectric transducer operation. The energy harvesting system is constituted of five functional blocks which are described in this paper.
To calculate the accurate value of the dynamic capacitance of a line under corona surge is very important taking into account that the dynamic capacitance value is influencing strongly the distortion of the surges travelling on a line toward the substations. So, it is possible to know the most probable shape and amplitude of the surge in any point of the line to allow the designers to take into account the most adequate measures of protection. Also, in the case of the induced overvoltage surges the dynamic capacitance has a major function, the induced overvoltages just in the initiating point being distorted because of the corona discharge and so easier protection measures having to be taken in the medium voltage distribution lines and substations as well.
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