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The finite input source queueing system has been widely used to solve many problems appearing on machine maintenance and repair systems, client-server computing, and production line operations, etc. In classical queueing models, arrival intensity is assumed to be a poisson distribution and the service times of all servers follow a independent and identically exponential distribution, in which the...
Hadoop is a famous distributed computing framework that is applied to process large-scale data. "Straggling tasks" have a serious impact on Hadoop performance due to imbalance of slow tasks distribution. Speculative execution (SE) presents a way to deal with Straggling tasks by monitoring the real-time progress of running tasks and replicating potential "Stragglers" on another...
Accurate mathematical models especially accurate hydrodynamic parameters of unmanned underwater vehicles (UUVs) are essential for good control performance. This paper provides a general framework for the hydrodynamic modeling of a small-scale UUV. In place of physical experiments such as captive model tests, a virtual model test and simulation was conducted via commercial computational fluid dynamics...
An efficient electro-thermal simulation based on parallelized alternating-direction-implicit (ADI) method is presented for transient analysis on-chip interconnects. Both temperature-dependence of electrical resistivity and Joule heating effect are taking into account in the modeling. With the ADI technique, the heat conduction equations can be calculated with linear computational complexity. The open...
In order to make full use of the underlying physical resources of Xen virtual machine, this paper presents a dynamic CPU resources scheduling method(DRS). DRS uses the allocated credits and consumed credits to diagnose the CPU resources requirements of VMs. VMs are divided into three resources statuses according to their resources requirements and run information. DRS dynamically schedules CPU resources...
Stability analysis of cascaded DC-DC converters systems is one of fundamental issues crucial to real-world power supplies applications. Existing techniques for stability analysis of cascaded converters systems are mainly based on Thevenin or Norton equivalents of two-port networks of sub-converters in which impedance-based stability criteria can be applied. In this work, further transformations of...
This article, considering the mechanical characteristic of wind turbine (WT), presents a nonlinear adaptive control strategy which is developed based on a two-mass model. Meanwhile, the nonlinear controller, applying backstepping adaptive approach based on virtual parameters, contributes to eliminate the undesirable effects of parametric uncertainties and stochastic disturbance. Moreover, the controller...
The integrated guidance and control (IGC) technology of aircraft has been developing for more than 30 years, and it mainly focused on the research in single plane. Due to the exigent requirement on the three-dimensional IGC technology in current researches, the mathematical modeling in three-dimensional space is considered and analyzed in order to solve the primary problem during the design period...
In this thesis, a new control algorithm iterative learning control (ILC) is applied in the force load control for fatigue testing machine due to non-linearity and unmodeled character of electro-hydraulic servo system and repeatability of fatigue testing machine. A model is established to describe electro-hydraulic servo force control system. According to the model, a controller based on ILC is designed...
By constructing the exponential delay cost function, we formulate the consumer decision model based on the threshold strategies in dual-mechanism, and prove that there exists a unique symmetric Nash equilibrium in which the high-valuation consumers use a threshold policy to choose between the two selling channels. Then we extend our model under general delay cost function, and find that consumers...
The appointment game is studied, and the normal form is defined. It is proved that the game satisfy superadditivety, monotonic, and non-convexity. It is proved that the core of the game is non-empty when n≤3. It is proved the necessary and sufficient conditions of the core are non-empty. In addition, it is proved that the bargaining set and the stable set coincides with the imputation set. It is proved...
Based on the sinusoidal pulse width modulation technology and regular sampling method, the switching time points calculation formulas of tangent method and secant method are established. This paper analyses the precision of switching turn-on and turn-off time point, and compare these switching time points. Calculation results show that SPWM pulses generated by tangent method and secant method are...
Rate control plays an important role in video coding and transmission. current initialization of quantization parameter (QP) in H.264 rate control takes the same value for images with different complexity as long as the bit number per pixel is the same which is different from the real-world situation. In this paper, we propose a new R-Q model and QP initializing method to improve the precision of...
H.264 is becoming the worldwide digital video standard for consumer electronics and personal computers. In particular, H.264 has already been selected as a key compression codec for the next generation of optical disc formats, HD-DVD and Blue-ray disc. Rate control (RC) plays an important role in allocating H.264 bits to adapt to the actual channel bandwidth and meanwhile achieve high-quality reconstructed...
The synthesis control of force and position in electro-hydraulic servo system has been applied to some special occasions. Analyzed a typical system which adopted this kind of control algorithm. Applying unchanged structure theory, the compensated transfer function has been deduced, the compensated state-space model is presented. Considering the synthesis control should meet the requirement to force...
An electro-hydraulic servo force feedback system is disturbed by a band-limited white noise, it adopted the conventional PID control algorithm. Simulated its dynamic characteristics. Constructed the system simplified model, Designed the GPC Controller and summarized its design procedure. The simulation based on the GPC with simplified model has been done. Compared the two simulation results, The GPC...
A novel arbitrary waveform power amplifier based on switch-linear hybrid (SLH) technology is proposed in this paper. The proposed amplifier utilizes a source follower to achieve excellent output waveforms quality while a switch-mode tracking power supply is employed to obtain high system efficiency. The steady and dynamic performances of the proposed amplifier optimized by the low system output impedance...
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