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This paper reports design and analysis of new low triggering voltage dual-polarity silicon-controlled rectifier (SCR) ESD protection structures and circuits in CMOS. Design optimization technique enables flexible ESD triggering voltage (Vt1), ESD holding voltage (Vh) and ESD protection capability. Measurements show very low and adjustable Vt1, low leakage (Ileak), low noise figure (NF), low ESD-induced...
We consider the energy-efficient network resource allocation that minimizes a cost function of average user powers for multi-hop wireless networks. A class of fair cost functions is derived to balance the tradeoff between efficiency and fairness in energy-efficient designs. Based on such cost functions, optimal routing, scheduling and power control schemes are developed. Relying on stochastic optimization...
Broken rotor bar (BRB) is one common fault of squirrel cage induction motors. When the BRB fault happens, the stator current of the induction motor contains a feature frequency component. The fault detection method based on the spectrum analysis of the stator current is commonly used. However, experiments show that the spectrum analysis of the stator current by directly using fast Fourier transform...
In this paper, fully coupled electro-thermal simulation of a micro pirani gauge is presented. The simulation was carried out using CFD-ACE+ software, based on Finite Volume Method (FVM) for multi-disciplinary modeling. Temperature coefficient of resistance (TCR) of silicon was taken into account for solving the joule heating and heat transfer equations. The influence of physical parameters on the...
The purpose of this paper is to establish a mathematical model for optimization design of three-stage cylindrical gear reducer and carry out a research on parametric design based on Pro/Engineer. In the optimization design, the minimum of overall gearpsilas center distance in reducer is the objective function, the pinionspsila tooth numbers, normal modules and the first two-stage transmission ratios...
In this paper, we design the near optimal transmission codebook for decentralized estimation in wireless sensor networks with uniform quantizations and digital communications over orthogonal Rayleigh fading channels. We start from deriving the maximum likelihood estimator (MLE) for arbitrary transmission codebook with known and unknown channel state information (CSI) at the fusion center (FC). Because...
This paper proposes an approach for automated composition of Web services using the And/Or graph and designs a corresponding layered architecture. The composition approach which decomposes tasks into smaller And, Or subtasks in And/Or graph bases on the similarity algorithm to find out optimized solution graph. Additionally, we embed the sequence-and node to support the transition from the And/Or...
The objective of this paper is to accomplish the modeling and coupling effect analysis of a high-speed aircraft. A 2D model of the high-speed aircraft is assumed. The description of the aerodynamic characteristics including forces and moments system models is included in this paper. The analysis and policies of decoupling are put forward based on the data of the high-speed aircraft. Results show that...
Based on modern optimization control maximum principle, the results of optimization control moment are given on the condition that the range of aircraft roll disturbance is fixed and the control is restricted. This method can conquer the disturbance of roll in the shortest time, which can ensure the stability of flight.
We present an approach that takes advantage of multi-packet reception (MPR) to reduce the negative effects of multiple access interference and therefore increase the capacity of an ad hoc network. We analyze the performance upper bound of joint routing and scheduling for ad hoc networks that embrace interference by using MPR. We formulate the optimization problem under a deterministic model and seek...
In order to detect the corrosion of grounding grids, a corrosion diagnosis approach based on Tabu search (TS) algorithm is put forward. A grounding grid is excited between couples of touchable nodes by a current source. Some voltages of touchable nodes are measured in each excitation. Minimizing the energy of the error between testing voltages and evaluation voltages is used as the index. The designed...
When multiple parameters jump simultaneously, a multiple models adaptive decoupling controller using dimension-by-dimension technology is presented to solve the problems such as too many models, long computing time and so on. To find the optimal parameter, it adopts one-dimension optimization method in series instead of multiple-dimension optimization method in parallel. At any time only one parameter...
We consider traffic scheduling in non-blocking electronic-buffered optical packet switches (OPS) with bounded packet delay. Due to the reconfiguration overhead of the switch fabric, the two commonly used optimization objectives, minimizing packet delay and minimizing switch speedup, conflict with each other. Intelligent scheduling algorithms have been designed to provide tradeoff between these two...
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