Solar energy is becoming more and more attractive as the shortage of conventional energy and the continuous deterioration of the earth *** article describes the implementation of an intelligent solar tracking system b...
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Solar energy is becoming more and more attractive as the shortage of conventional energy and the continuous deterioration of the earth *** article describes the implementation of an intelligent solar tracking system based on embedded microcontroller *** can improve the photoelectric conversion efficiency of the solar cell array by tracking the movement of the sun through 2axis stepping motors ' *** order to achieve this goal,a new calculation method for sun position is introduced briefly comparing with two conventional solar tracking ***,the hardware structure of the intelligent solar tracking system based on Philips LPC2131 microcontroller is proposed and implemented in *** control strategy is applied to the control mechanism to ensure its adjustability and fast response ***,the software code for stepping motor is *** solar tracking system increases the efficiency of solar panels with high accuracy and flexibility.
A simple coupled-line structure is proposed to construct a novel planar bandstop filter. The reconfigurable performance is achieved by using tunable capacitors, namely, varactor diodes. The stopband of this filter can...
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A simple coupled-line structure is proposed to construct a novel planar bandstop filter. The reconfigurable performance is achieved by using tunable capacitors, namely, varactor diodes. The stopband of this filter can be tuned from 0.6 to 1.57 GHz when the capacitance of capacitors is in the range of 1 to 7 pF. Both simulated and measured results verify this proposed idea.
A novel approach to interactively segmenting a foreground object from its surrounding background in an image is *** segmentation is done by evolving an initial object contour computed by the power watershed *** contou...
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A novel approach to interactively segmenting a foreground object from its surrounding background in an image is *** segmentation is done by evolving an initial object contour computed by the power watershed *** contour evolution is based on a novel scheme using the active contour *** show that the given approach is very effective for segmenting objects in gray images or images with noises and when the contrast between objects and the background is low.
In recent years,the threshold for removing noise based on wavelet transform has been very widely used because of its effectiveness and ***,there has been threshold based on a variety of frequency-domain *** the proces...
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In recent years,the threshold for removing noise based on wavelet transform has been very widely used because of its effectiveness and ***,there has been threshold based on a variety of frequency-domain *** the process of denoising,due to the differentiation of transform coefficients generated by noise and edge information,a good threshold for denoising can make a significant impact on the image *** currently existing threshold,spatially adaptive threshold based on Context-Modeling is proposed because of having considered neighboring coefficients so that it can adjust to coefficient *** this paper the improved spatially adaptive threshold method is applied to the nonsubsampled contourlet *** results show that the method yields superior image quality and higher PSNR.
To provide more trustworthy service to service requester(SR),a prior trust degree predicting method is necessary in most ***,in the distributed systems,trust model is so complex that it is very difficult to quantify a...
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To provide more trustworthy service to service requester(SR),a prior trust degree predicting method is necessary in most ***,in the distributed systems,trust model is so complex that it is very difficult to quantify and predict ***,according to human psychological cognitive behavior,a trust predicting method based on back propagation neural network(BPNN) is proposed in this ***,due to the stochastic of initial weights' assignment and search complexity for optimal weights,training algorithm can easily be trapped into local optimum,or be slow to converge or even *** on these problems,a learning rate in network training is proposed *** using adaptive data mining and knowledge discovery in multidimensional trust attributes,the model also overcomes the problem of insufficient ability of data processing in traditional models.
In this paper we present a medium access scheme for vehicular ad-hoc networks which is based on clustering of the *** method leverages contention-free and contention-based MAC（Medium Access Control）,to support diffe...
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In this paper we present a medium access scheme for vehicular ad-hoc networks which is based on clustering of the *** method leverages contention-free and contention-based MAC（Medium Access Control）,to support different requirements of safety and non-safety ***-cluster interference avoidance is also *** the effect of hidden stations can be minimized,which leads to a more reliable data transfer than ieee 802.11 based systems can *** results confirm the superior performance of the proposed algorithm in terms of average cluster head（CH） lifetime,average number of retransmission,average number of collision,and average End-to-End delay.
In this paper, a Remote Radio Unit (RRU) selection scheme is proposed in coordinated multipoint transmission (CoMP) systems to improve the system throughput, especially for cell-edge performance. An assist graph is co...
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In this paper, a Remote Radio Unit (RRU) selection scheme is proposed in coordinated multipoint transmission (CoMP) systems to improve the system throughput, especially for cell-edge performance. An assist graph is constructed according to the channel condition between the RRU and User equipment. Based on the assist graph, a heuristic algorithm is proposed to optimize the system performance with fairness constraints. The simulation results show that the proposed scheme can improve the performance of system throughput.
We analyze the traffic carrying capacity of a single- input single-output system for a given delay guarantee at the flow level. A continuous time ON/OFF data source is considered as the traffic model while the wireles...
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We analyze the traffic carrying capacity of a single- input single-output system for a given delay guarantee at the flow level. A continuous time ON/OFF data source is considered as the traffic model while the wireless channel is modeled using the Gilbert-Elliot model. We study the impact of the delay bound violation probability, traffic burstiness, channel memory and the delay requirements at the network layer on the throughput under different signal strength.
RFID is an essential technology in the Internet of *** it is a contactless,low power,and low cost wireless communication *** the process of tag identification,an efficient anti-collision algorithm will remarkably cont...
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RFID is an essential technology in the Internet of *** it is a contactless,low power,and low cost wireless communication *** the process of tag identification,an efficient anti-collision algorithm will remarkably contribute to the RFID system in terms of accelerating identification *** this paper,a stack-like anti-collision algorithm is proposed,which is based on ISO *** can solve the problem of Q value fluctuation to some degree and improve the system efficiency.
Quick and highly efficient warning is critical in any emergency evacuation. From the issuing of warning until action taken by people in response, the entire course is a very complex process which is restrained by soci...
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Quick and highly efficient warning is critical in any emergency evacuation. From the issuing of warning until action taken by people in response, the entire course is a very complex process which is restrained by social, economic, population and other factors. To study the diffusion characteristics of warning in the social network environment as well as the relevant influencing factors, under the guidance of complex system theory and multi-agent modeling method, this paper analyzes the six stages in the diffusion process of warning and builds a diffusion model of warning on the multi-agent software platform Repast based on WS small world network model. Through the study of the simulation results, we find that the diffusion of warning is similar to the diffusion of other information, which showed a similar S-curve.
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