A simplified method is proposed for calculatingthe impulse resistance of vertical grounding rods. Theanalytic formula is first derived to determine the low currentresistance and then the calculation procedure is devel...
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A simplified method is proposed for calculatingthe impulse resistance of vertical grounding rods. Theanalytic formula is first derived to determine the low currentresistance and then the calculation procedure is developedto estimate the impulse resistance. In the procedure, anoulinear relationship is introduced to characterize theelectric field and current density in the ionization zonesurrounding the grounding rod. The effective radius of thegrounding rod is evaluated according to the nonlinearrelationship. The impulse resistance is calculated bysubstituting the effective radius into the analytic formula ofthe low current resistance. Finally. a comparison is madebetween calculated and measured results in confirmation ofthe validity of the proposed method.
There is a lot of multimedia data types, related compressalgorithms and related code standards that have differentcharactenistics and adapt to different application *** the characteristics of multimedia dynamically is...
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There is a lot of multimedia data types, related compressalgorithms and related code standards that have differentcharactenistics and adapt to different application *** the characteristics of multimedia dynamically is helpful forclearly understanding and properly using the media data. Theobjective of this research is to develop a network multimediaevaluation platform based on the client/server mode, by means ofanalyzing and comparing the feathers of main media (the series ofMPEG. ITU-H, ITU-G, JPEG, etc) compression algorithm. Theplatform, MATEP, can test and display main parameters of relatedmultimedia data. These parameters can be used in QoS control.
Better compression results can be achieved bycoding vectors instead of scalars, Proposed algorithm isused for competitive learning of Vector QuantizationNeural Network, which is used to generate a codebookfor the Vect...
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Better compression results can be achieved bycoding vectors instead of scalars, Proposed algorithm isused for competitive learning of Vector QuantizationNeural Network, which is used to generate a codebookfor the Vector Quantization of ECG signal. TheCompetitive Learning Algorithm can successfully groupthe sample group to generate codebook and reproduce atthe time of reconstruction.
The research in the paper contributes to publiclydelivering the delegation parameter and to reducing theamount of verifying operation for a proxy signature. Anew proxy-protected proxy signature scheme is presentedbase...
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The research in the paper contributes to publiclydelivering the delegation parameter and to reducing theamount of verifying operation for a proxy signature. Anew proxy-protected proxy signature scheme is presentedbased on the elliptic curve discrete logarithm problem(ECDLP). To the demand for security, the proposedscheme inherits most merits of the typical solutions basedon the discrete logarithm problem (DLP). As to theexpectation toward efficiency, the scheme based on theECC can achieve higher performance than those based onthe DLP.
A new control scheme based on artificialneural network (ANN) for a voltage-type active powerline conditioner (APLC) is proposed. APLC is a veryefficient apparatus for compensating harmonies causedby nonlinear loads. T...
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A new control scheme based on artificialneural network (ANN) for a voltage-type active powerline conditioner (APLC) is proposed. APLC is a veryefficient apparatus for compensating harmonies causedby nonlinear loads. The proposed Nlq controller canprovide appropriate switch control signals for APLC togenerate compensation currents to reduce wavedistortion in single phase, three-phases three-wires andthree-phases four-wires distribution system. The trainingdata are obtained using evolutionary *** simulations confirm the validity of theproposed NN controner.
In this paper, neural networks (NNs) and adap-tive robust control (ARC) design philosophy are integratedto design performance-oriented control laws for a class of un-certain systems whose output is corrupted by extern...
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In this paper, neural networks (NNs) and adap-tive robust control (ARC) design philosophy are integratedto design performance-oriented control laws for a class of un-certain systems whose output is corrupted by external dis-turbances. The derived adaptive-robust control schemes notonly guarantee all the signals are bounded in the closed loopbut also make the system preserve certain prescribed proper-ties. The cone-bounded assumption on the uncertain dynam-ics is removed via neural networks. The feedback informationis the state with measurement noise.
An optimized structure CMOSdivide-by-128/129 or 64/65 Dual-Modulus prescalerusing dynamic circuit technique is implemened in0.25um CMOS digital technology New optimizedstructure reduces the propagation delay and impro...
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An optimized structure CMOSdivide-by-128/129 or 64/65 Dual-Modulus prescalerusing dynamic circuit technique is implemened in0.25um CMOS digital technology New optimizedstructure reduces the propagation delay and improvesoperating speed. In this structure, an improved dynamicD-flipflop (DFF) is utilized. A prototype is fabricatedand the measured results show that this prescaler workswell in gigahertz frequency range. It only consumes35mW (Including three power-hungry output buffers)when the input frequency is 2.5GHz and the powersupply voltage is *** die size is 0.47×0.46mm.
Space-time block code (STBC) hasbeen paid much attention due to its simplicity and wellperformance. For wireless downlink transmission, thismeans that the communication quality is improved withoutincreasing both the c...
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Space-time block code (STBC) hasbeen paid much attention due to its simplicity and wellperformance. For wireless downlink transmission, thismeans that the communication quality is improved withoutincreasing both the complexity of receiver and the numberof receive antennas. Instead of applying maximumlikelihood decoding (MLD), this paper will use the leastsquare decoding (LSD) to interpret the decoding structureof STBC. Furthermore, the performances of STBC-basedtransmit diversity systems in slowly Rayleigh fadingchannel are evaluated by theoretical derivation andcomputer simulation, as well. It is shown that thetheoretical curves and simulation results are matched witheach *** the least square interpretation, theSTBC-based transmit diversity system is more conciselyrealized.
Distributed Coordination Function (DCF)protocol is used for channel access in ieee 802.11 *** performance issue of he protocol has achieved a lot ofresearch interests. However, during the previous researchwork, the im...
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Distributed Coordination Function (DCF)protocol is used for channel access in ieee 802.11 *** performance issue of he protocol has achieved a lot ofresearch interests. However, during the previous researchwork, the impact of retransmissions and bit error ratio onthe performance of DCF is not taken into *** analytical model is presented in this paper to evaluatethe performance of the scheme in the case of finite retrans-missions.
This paper presents a new logical topology Ex-cube-net, based on the properties of hypercube network forenhancing the reliability of optical networks usingwavelength division multiplexing. The presence ofmultiple numb...
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This paper presents a new logical topology Ex-cube-net, based on the properties of hypercube network forenhancing the reliability of optical networks usingwavelength division multiplexing. The presence ofmultiple number of paths between any two nodes inexchange of reasonable number of hops in the network,ensures a higher degree of reliability compared to otherexisting topologies in case of link failure, as well as inbalancing link loading in the network so as to maximisethe network throughput.
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