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Run-to-run (RtR) control technology has received tremendous interest in semiconductor manufacturing industry. Exponentially weighted moving average (EWMA), double EWMA controllers are recognized most popular control schemes for RtR control. In this paper, stability analysis of double EWMA control system is examined in control theory. The novelty of this work is that an iterative method is developed...
The exponentially weighted moving average (EWMA) controller is a popular run-to-run (RtR) control scheme in semiconductor manufacturing because of its effectiveness and simplicity. In this paper we propose an improved variable EWMA controller design method. The optimal discount factor of the EWMA controller is determined by minimizing the mean square error (MSE) of process output at each run. The...
An increasing popularity of smartphones affects interaction behaviors between people. The ubiquity of smartphones with embedded sensors can enable attractive sensing applications for collecting and reporting data in participatory sensing environment. However, time and monetary cost hinder people from providing sensing data using their smartphones. Smartphone users will probably not participate in...
Conventional single-phase inverters exhibit double line frequency power pulsating, which affects dc sources such as photovoltaic performance and battery lifetime. Bulky dc-link electrolytic capacitors are typically employed as transient energy buffer to decouple the pulsating ac power from constant dc power, but such passive components suffer from temperature and aging concerns. For high reliability...
On basis of trimming glide and horizontal flight modes, the Mini-derivative linearization model of aeromarine aerodynamic missile is constructed. As the mathematical model of missile plant, inertia component and rudder are combined, the PID parameters and lead/lag correction network is designed by frequency domain method to ensure the stability margin of attitude inner loop and the maneuverability...
Hybrid architectures combined of VLIW, SIMD and multi-core schemes are increasingly prevailing in media processors, due to the abundant parallelism existed in media applications. However, parameters for current combinations such as the VLIW length, SIMD width and core count are set mainly according to simple profiling or the designer's experience rather than a systematic and in-depth investigation...
In this paper we shall propose a kind of non-Lipschitz assumption which is related to time variable t to the generator of backward stochastic differential equations (BSDE in short) and get the existence and uniqueness result for the adapted solution to BSDE.
This paper presents a novel indirect current control technique applied to a Single-Phase PWM rectifier to increase power factor and reduce harmonic current. It is applied to railway traction converters with low switching frequency, high voltage and high power. To get better stability and easier realization, indirect current control scheme is used in the inner loop control. Much computing such as extraction...
Several ten nanometers width TiOx wires was fabricated on the surface of 3~5 nm thick Ti lines which covers GaAs substrate. TiOx wires are fabricated by atomic force microscope (AFM), and the Ti lines are fabricated by photolithograph method. Oxide is used as insulator/energy barrier between the electrodes to substitute the air gap of traditional type photoconductive semiconductive switches (PCSS)...
In order to maximize the profits from oil recovery, an optimal control approach for reservoir production working systems using gradient-based method is considered in the paper. It regards reservoir as a large-scale complex dynamic system. On the basis of flow dynamics, reservoir numerical simulation and optimal control theories, the optimization mathematical model of production working system is established...
Particle swarm optimization (PSO) algorithm for resource-constrained project scheduling problem (RCPSP) is introduced in the paper. The activities sequence encoded with the simple code rule by the code order is just corresponding to the project scheme fulfilling the precedence constraint, and it is convenient to calculate the start time scope (solution space) of all activities in the project. The...
According to the behavior of seismically isolated continuous bridges, the bidirectional nonlinear characteristics of lead rubber bearing are taken into account by using two orthogonal nonlinear level spring elements. Based on the FEA software, the analysis models of seismically isolated and non-isolated continuous bridges are established. And the nonlinear seismic response for these analysis models...
The energy equations of the base-isolated structure are established based on the energy equilibrium theory. Reasonable strong seismic motion records are selected. Based on the general FEA program, the bidirectional nonlinear behavior of lead rubber bearing is taken into account by using two orthogonal nonlinear spring elements. Considering the effect of principal parameters of lead rubber bearing...
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