1,045 research outputs found

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    The journey so far

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    Optimization of a Power Splitting Protocol for Two-Way Multiple Energy Harvesting Relay System

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    Energy harvesting (EH) combined with cooperative communications constitutes a promising solution for future wireless technologies. They enable additional efficiency and increased lifetime to wireless networks. This paper investigates a multiple-relay selection scheme for an EH-based two-way relaying (TWR) system. All relays are considered as EH nodes that harvest energy from renewable energy and radio frequency (RF) sources. Some of them are selected to forward data to the destinations. The power splitting (PS) protocol, by which the EH node splits the input RF signal into two components for EH and information transmission, is adopted at the relay nodes. The objective is to jointly optimize i) the set of selected relays, ii) their PS ratios, and iii) their transmit power levels in order to maximize data rate-based utilities over multiple coherent time slots. A joint-optimization solution based on geometric programming (GP) and binary particle swarm optimization is proposed to solve non-convex problems for two utility functions reflecting the level of fairness in the TWR transmission. Numerical results illustrate the system's behavior versus various parameters and show that the performance of the proposed scheme is very close to that of the optimal branch-and-bound method and that GP outperforms the dual problem-based method

    A Comparative Study on Whole Body Vibration (WBV) Comfort towards Compact Car Model through Data Mining Approach

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    Nowadays people of Malaysian spend a significant amount of time traveling by the vehicle to travel from one location to another location, and this could be the main reason to decrease minimal vibration for the comfort level in transportation. The vibration that generated while driving can influence pressure and eliminate the focus to the driver and passenger, and this is one of the main causes that can lead accidents on the roads. In this study, we investigate the effect of the vibration caused by the tire interaction with the road surface. The methodology focuses on the trends which occur on the vibration exposure that has been generated throughout the engine operating rpm range in both stationary and nonstationary conditions. An equation will be approached through the analysis to find the significant data that can be used in the process which is K-Means algorithm. Based on the trends of the experienced and exposed vibration, the model is able to differentiate the level of comfort between the clusters by grouping the level of vibration into five categories. To review the accuracy of classification data cluster, the K-Nearest Neighbor method and Analysis Linear Discriminant is used for shows the percentage accuracy of classification data have been a cluster. Later, the vibration for the three cars in this study which has analyzed, compared using the approach of analysis of variations (ANOVA)

    Smart Tracking System for School Buses Using Passive RFID Technology to Enhance Child Safety

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    Abstract-Millions of children need to be moved from home to school and vice versa every day. For parents, obtaining a safe transport for their children is a critical issue. Many children find themselves locked in a school bus in the bus parking lot after falling asleep on their way to school, miss the bus, step into the wrong bus, or leave at the wrong station with no method to track them. This research tested the applicability of radio frequency identification (RFID) technology in tracking and monitoring children during their trip to and from school on school busses. The child safety system developed in this research utilized the passive RFID tracking technology due to its efficient tracking capabilities, low cost, and easy maintenance. To explore the technical feasibility of the proposed system, a set of tests were performed in the lab and with the public. These experiments showed that the RFID tags were effective and stable enough to be used for successfully tracking and monitoring children using the bus. When asked to give their feedback of the solution through a questionnaire, more than 95% of the parents see that such a solution will take their anxiety and worry away and will provide them a tool to track their kids during commuting to and from their schools. Index Terms-School buses, passive RFID, child safety, tracking system
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