We have analyzed the performance of TCP in the CDMA mobile communications systems with the adaptive modulation and coding (AMC). An embedded Markov chain has been formulated and the system throughput has been derived....
详细信息
We have analyzed the performance of TCP in the CDMA mobile communications systems with the adaptive modulation and coding (AMC). An embedded Markov chain has been formulated and the system throughput has been derived. The wireless channel using AMC is characterized with not high error rate but highly varying bandwidth. Due to time-varying bandwidth, timeout events of TCP occurs more frequently, which leads to the throughput degradation. Since our system model is characterized by the forward link high speed data transmission using AMC, the results reported in this paper can be used as a guideline for the design and operation of HSDPA, 1xEV-DO, and 1xEV-DV.
A novel method for nonlinear identification of a static compensator connected to a power system using continually online trained artificial neural networks is presented. The identifier is successfully trained online t...
详细信息
A novel method for nonlinear identification of a static compensator connected to a power system using continually online trained artificial neural networks is presented. The identifier is successfully trained online to track the dynamics of the power network without any need for offline data. It can be used for designing an adaptive neurocontroller for a static compensator connected to such a system.
We present a new actuator based on glass capillary bonded to laser-cut PZT plate, for ultrasonic control of microparticles inside microfluidic channels. The actuator generates high velocity bending modes at low CMOS c...
详细信息
We present a new actuator based on glass capillary bonded to laser-cut PZT plate, for ultrasonic control of microparticles inside microfluidic channels. The actuator generates high velocity bending modes at low CMOS compatible 5-10 Vpp drive. The high velocity enables focusing of samples at the nodes and the antinodes of the bending waves in the capillary. Separation of 3 and 10 microns polystyrene microbeads in space by 800 μm is achieved. *** cells and blood cells can also be separated with particles with lower density than water being placed at the transverse velocity nodes and heavier particles at the antinodes.
The critical issues in the design and manufacturing of permanent magnet motors that are responsible for increased magnetic signatures were discussed. The magnetic signature was described with the help of spatial harmo...
详细信息
The critical issues in the design and manufacturing of permanent magnet motors that are responsible for increased magnetic signatures were discussed. The magnetic signature was described with the help of spatial harmonic analysis. The approach focuses on lower degree magnetic dipole moments in spheroidal and spherical domains and is applied to permanent magnets inducing elements.
This paper proposes an improved ray tracing technique that can reproduce a realistic image based on the spectral characteristic of real lights and objects. The proposed algorithm is able to generate a realistic image ...
详细信息
This paper proposes an improved ray tracing technique that can reproduce a realistic image based on the spectral characteristic of real lights and objects. The proposed algorithm is able to generate a realistic image that simulates the physical quantity of light energy incoming toward a viewer. First, an accurate image is reproduced using the backward ray tracing method and by tracing the spectral transformation procedures of the rays using the spectral characteristic of objects and illuminants. Next, the shading model of the reproduction algorithm of a realistic image is improved by applying Bouguer-Beer's law to consider the optical absorptive property of transparent objects. Finally, a new ambient light term that considers the diffuse reflection of neighboring objects is defined instead of a constant ambient light term.
Spectrum Analysis of surface waves (SASW) is one of the most effective non-invasive methods for soil characterization. Surface waves travel in the medium along a free boundary and can be easily detected by using a tra...
详细信息
Spectrum Analysis of surface waves (SASW) is one of the most effective non-invasive methods for soil characterization. Surface waves travel in the medium along a free boundary and can be easily detected by using a transducer placed on the free surface of the boundary. Traditional methods of SASW are two-station methods that use the phase information at two receivers to determine phase velocity as a function of frequency. Multi-station methods have also been developed by using a two-dimensional Fourier transform approach, but these methods exhibit poor resolution. We propose a new method based on vector processing of data obtained from an array of tri-axial sensors to produce a high resolution, multi-modal spectrum of the surface waves. These different modes can be identified and reconstructed in time domain, and then inverted to obtain the shear velocity profile of the subsurface.
The design of nonlinear optimal neurocontrollers based on the Adaptive Critic Designs (ACDs) family of algorithms has recently attracted interest. This paper presents a summary of these algorithms, and compares their ...
详细信息
The design of nonlinear optimal neurocontrollers based on the Adaptive Critic Designs (ACDs) family of algorithms has recently attracted interest. This paper presents a summary of these algorithms, and compares their performance when implemented on two different types of artificial neural networks, namely the multilayer perceptron neural network (MLPNN) and the radial basis function neural network (RBFNN). As an example for the application of the ACDs, the control of synchronous generator on an elec.ric power grid is considered and results are presented to compare the different ACD family members and their implementations on different neural network architectures.
A coupled cellular automata representation of nanoscale transport across semiconductor interfaces was discussed. By sampling the outcomes of elec.ron-phonon and elec.ron-phonon-photon scattering events, the Discrete S...
详细信息
A coupled cellular automata representation of nanoscale transport across semiconductor interfaces was discussed. By sampling the outcomes of elec.ron-phonon and elec.ron-phonon-photon scattering events, the Discrete State Simulation duplicated well characterized non-equilibrium transport characteristics of single band and indirect band gap semiconductors. The reported simulations used actual elec.ron/hole, phonon and photon occupancies. The ability to simulate global transport behavior for arbitrary and dynamically varying conditions increase the efficacy of future design efforts.
In the present work, a constructive learning algorithm is employed to design an optimal one-hidden layer neural network structure that best approximates a given mapping. The method determines not only the optimal numb...
详细信息
In the present work, a constructive learning algorithm is employed to design an optimal one-hidden layer neural network structure that best approximates a given mapping. The method determines not only the optimal number of hidden neurons but also the best activation function for each node. Here, the projection pursuit technique is applied in association with the optimization of the solvability condition, giving rise to a more efficient and accurate computational learning algorithm. As each activation function of a hidden neuron is optimally defined for every approximation problem, better rates of convergence are achieved. The proposed constructive learning algorithm was successfully applied to identify a large-scale multivariate process, providing a multivariable model that was able to describe the complex process dynamics, even in long-range horizon predictions. The resulting identification model is then considered as part of a model-based predictive control strategy, with high-quality performance in closed-loop experiments.
The paper proposes a fast Fourier transform (FFT) architecture to satisfy both small area and high speed. The proposed architecture uses the mixed-radix algorithm based on the radix-4 and radix-2 algorithms and the me...
详细信息
The paper proposes a fast Fourier transform (FFT) architecture to satisfy both small area and high speed. The proposed architecture uses the mixed-radix algorithm based on the radix-4 and radix-2 algorithms and the memory bank structure for high speed real-time processing. To satisfy the small area requirement, it uses an in-place memory strategy that stores butterfly outputs in the same memory location used by butterfly inputs. To meet real-time processing, this paper proposes a continuous flow architecture using only two N-word memories for the mixed-radix algorithm. The proposed architecture can reduce the number of clock cycles about 70% compared with an existing architecture.
暂无评论