Current Issue : April - June Volume : 2015 Issue Number : 2 Articles : 5 Articles
The feasibility of a non contact sensor is investigated. This type of sensor can potentially be used for torque measurement in a speed variable\npower transmission system. Torque can be read by examining the phase difference between two induction signals from\nrespective magnetic sensors that detect the magnetic field intensity of permanent magnets mounted on the surface of a shaft in\nrotation. A real-time measuring algorithm that includes filtering and calibration is adopted to measure the torque magnitude. It is\nshown that this new torque sensor can perform well under rotation speeds ranging from 300 rpm to 500 rpm. As an interim report\nrather than a complete development, this work demonstrates the feasibility of non contact torque measurement by monitoring a\nmagnetic field. The result shows an error of less than 2% within the full test range, which is a sufficient competitive performance\nfor commercial sensors. The price is very low compared to competitors in the marketplace, and the device does not require special\nhandling of the shaft of the surface....
Autonomic computing (AC) is a promising approach tomeet basic requirements in the design of wireless sensor networks (WSNs),\nand its principles can be applied to efficiently manage nodes operation and optimize network resources. Middleware for WSNs\nsupports the implementation and basic operation of such networks. In this systematic literature review (SLR) we aim to provide an\noverview of existingWSN middleware systems that address autonomic properties. The main goal is to identify which development\napproaches of AC are used for designing WSN middleware system, which allow the self-management of WSN. Another goal is\nfinding out which interactions and behavior can be automated inWSN components.We drew the followingmain conclusions from\nthe SLR results: (i) the selected studies addressWSN concerns according to the self-? properties of AC, namely, self-configuration,\nself-healing, self-optimization, and self-protection; (ii) the selected studies use different approaches for managing the dynamic\nbehavior of middleware systems forWSN, such as policy-based reasoning, context-based reasoning, feedback control loops, mobile\nagents, model transformations, and code generation. Finally, we identified a lack of comprehensive system architecture designs that\nsupport the autonomy of sensor networking....
This paper presents a new routing protocol called Secure and Energy Aware Routing Protocol (ETARP) designed for energy\nefficiency and security for wireless sensor networks (WSNs). ETARP attempts to deal with WSN applications operating in extreme\nenvironments such as the battlefield. The key part of the routing protocol is route selection based on utility theory.The concept of\nutility is a novel approach to simultaneously factor energy efficiency and trustworthiness of routes in the routing protocol. ETARP\ndiscovers and selects routes on the basis of maximum utility with incurring additional cost in overhead compared to the common\nAODV(AdHoc On Demand Distance Vector) routing protocol. Simulation results show that, in comparison to previously proposed\nrouting protocols, namely, AODV-EHA and LTB-AODV (Light-Weight Trust-Based Routing Protocol), the proposed ETARP can\nkeep the same security level while achieving more energy efficiency for data packet delivery....
Radiofrequency thermal ablation (RFA) is a procedure aimed at interventional cancer care and is applied to the treatment of\nsmall- and midsize tumors in lung, kidney, liver, and other tissues. RFA generates a selective high-temperature field in the tissue;\ntemperature values and their persistency are directly related to themortality rate of tumor cells. Temperature measurement in up to\n3ââ?¬â??5 points, using electrical thermocouples, belongs to the present clinical practice of RFA and is the foundation of a physical model\nof the ablation process. Fiber-optic sensors allow extending the detection of biophysical parameters to a vast plurality of sensing\npoints, using miniature and noninvasive technologies that do not alter the RFA pattern. This work addresses the methodology for\noptical measurement of temperature distribution and pressure using four different fiber-optic technologies: fiber Bragg gratings\n(FBGs), linearly chirped FBGs (LCFBGs), Rayleigh scattering-based distributed temperature system (DTS), and extrinsic Fabry-\nPerot interferometry (EFPI). For each instrument, methodology for ex vivo sensing, as well as experimental results, is reported,\nleading to the application of fiber-optic technologies in vivo.The possibility of using a fiber-optic sensor network, in conjunction\nwith a suitable ablation device, can enable smart ablation procedure whereas ablation parameters are dynamically changed...
In mobile Internet of Tings, based on cross-layer design and resource-aware scheduling, the combination of light weight coding\nand compressed sensing is used to improve the real-time performance of acquisition of system resource and reliability of resource\nmanagement in this paper. Compressed sensing scheme based on the adaptive frame format definition of lightweight coding is able\nto set up the parameters such as sample signal, signal and hops. The nonlinear relationship matrixes between resource information\nof sensors or system and quality of services are built to manage the global or local network resource scheduling. Experimental\nresults show that the proposed scheme is better than the traditional scheme or resource management based on compressed sensing\nalone scheme, which can make the system be able to achieve optimal resource allocation....
Loading....