Current Issue : April - June Volume : 2017 Issue Number : 2 Articles : 6 Articles
Low complexity and efficient algorithms for Radio-Frequency Identification (RFID) are crucial\nto foster low-cost and energy-saving solutions. With the aim of lowering the complexity of the radio\ncircuitry, and inspired by the superposition codes concept, we propose a novel encoding algorithm\nfor tag-to-reader communication channels of modern RFID systems. We show that the developed\nschemeââ?¬â?despite the simplicity of its hardware realizationââ?¬â?allows a coding gain comparable to\nthe one obtained by the more complex Viterbi decoding of the Miller 4 modulation scheme used\nin the EPC Generation 2 Class 1 RFID standard. Simulation results prove the effectiveness of the\nproposed solution for low-cost tags, under different signal-to-noise ratios (SNRs) and interrogation\ntime durations. Although our numerical evaluation mainly focuses on the EPC Generation-2 standard,\nwe believe that the proposed scheme will also be attractive for future Ultra-wideband RFID systems....
A steady traffic growth has posed a threat to the fatigue safety of existing bridges. Uncertainties in traffic flows add to the challenge\nof an accurate fatigue safety assessment. This article utilizes a stochastic traffic load model to evaluate the fatigue reliability of\northotropic steel bridge decks. The traffic load model is simulated by site-specific weigh-in-motion measurements. A response\nsurface method is presented to solve the time-consuming problem caused by hotspot stress simulations in the finite element model.\nApplications of the stochastic traffic load model for probabilistic modeling and fatigue reliability assessment are demonstrated in\nthe case study of a steel box-girder bridge. Numerical results indicate that the growth rate of the gross vehicle weight leads to a rapid\ndecrease of the fatigue reliability in comparison to the traffic volume growth. Even though the traffic volume growth is rapid, the\ncontrol of overloaded trucks in comparison to the traffic volume is an effective way to ensure the fatigue safety of the steel bridges....
Improving the efficiency of the agricultural irrigation systems substantially contributes to sustainable water management. This\nimprovement can be achieved through an automated irrigation system that includes a real-time control strategy based on the water,\nsoil, and crop relationship.This paper presents a model driven control strategy applied to an irrigation system, in order to make an\nefficient use of water for large crop fields, that is, applying the correct amount of water in the correct place at the right moment. The\nproposed model uses a predictive algorithm that senses soil moisture and weather variables, to determine optimal amount of water\nrequired by the crop. This proposed approach is evaluated against a traditional irrigation system based on the empirical definition\nof time periods and against a basic soil moisture control system. Results indicate that the use of a model predictive control in an\nirrigation system achieves a higher efficiency and significantly reduce the water consumption....
Electric brake experiment of hub-motor is preliminary basis of the regeneration\nbraking control strategy. A regenerative braking test bench of hub-motor is\ndesigned in which the test and control system is developed based on Labview and\nNI virtual instrument. The physical structure, signal acquisition hardware and test\nsystem principle of the bench are introduced. The bench can test torque and speed\nof the hub-motor, on which the electric brake experiment and etc. can be done.\nThrough the unloaded glide and electric brake experiments, the results show that\nthe design of the bench is reasonable and control modes of the test and control\nsystem is feasible. Furthermore, the test bench can provide important references for\nregeneration braking control strategy and motor performance tests....
Filtering techniques are impact in large-scale by meaningful information which use\nprocess by layer, component, aspect, dimensional and elements as well as determine the\ninput for each techniques and the processes. The complexity of filters appear via\nphases and requesting the conditions of filters process which similar than relevance data\nto find out the accurate matching, likewise, parameters output from filter techniques\nlimited between three outcomes, absolutely input are document , set of profiles such as\nsocial media, Second is matches structures, and the last is data ambiguous , all these\napplied in filter platform of applications to provide it to clear process within several\nissues starting the frame the filters, parameters filter, implementable filter and\nconsequences process during collection data to reach the classification filters....
Surface acoustic wave sensors offer overwhelming advantages over other potentially competitive sensing technologies in\nrotating mechanical structures for their wireless and passive capability. Nevertheless, the challenges of using these sensors\nhave not been adequately addressed. Radio frequency signal of surface acoustic wave sensors acts as not only the\nrole of data transmission but also the role of energy supply during the sensing system working process. Thus, the performance\nof surface acoustic wave sensors when they are used to monitor rotating spindles should be investigated due to\nthe harsh metallic environments for radio propagation in machine tool. This article aims to experimentally study the performance\nof surface acoustic wave sensors on both rotating spindle with Computer Numerical Control machine tool\nand self-developed spindle apparatus. The measurement study is performed using a temperature surface acoustic wave\nsensor working in the Industrial Scientific and Medical (ISM) band (433.05ââ?¬â??434.79MHz). Experimental results have\nshown that transmission and measurement characteristics were closely depended on the surface acoustic wave sensor\ninstallation location and rotation speeds. The conclusions will directly guide the sensor location optimization, power setting,\nerrors avoidance, or correction in the future work....
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