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Abstract: There are many methods available for Load frequency control in an interconnected power system. This paper deals with tuning of PID controller for Load frequency control. A two area thermal power system is considered for study. Both the areas are equipped with PID controller. Parameters of these PID controllers are obtained using Particle Swarm Optimization. A comparative study on tuned values has been presented to verify effectiveness. Ziegler-Nichols method is used for tuning of parameters for comparative study. The simulation results demonstrate the effectiveness of the designed system in terms of reduced settling time and oscillations. MATLAB/SIMULINK was used as simulation tool. [Copyright &y& Elsevier]

Abstract: In this paper, performance of the liquid desiccant dehumidification system in evaporation coolers was investigated by the Second Law of Thermodynamics analysis. This system was designed and manufactured for this purpose. Lithium chloride (LiCl), as liquid desiccant, and a packed bed column were used for dehumidification. The described system includes a part for processed air simulation in various temperatures and humidities. Entropy generation of the liquid desiccant dehumidifier was analyzed based on the second thermodynamic law. The effect of inlet parameters of the dehumidification column on the entropy generation was also investigated. The results showed that the entropy generation was highly dependent to operational conditions and inlet parameters of the desiccant dehumidification column. [Copyright &y& Elsevier]

Abstract: Taking the air Computer Generated Air Forces(CGF) as research subject, this paper mainly focuses on the design and implementation of air CGF model. The feature of the Intelligent Digital Aircraft model of air CGF is analyzed. In particular, the dynamic modeling method based the limited parameters model and the establishment of the tactical decision-making model based on the fuzzy logic and neural network are introduced. The simulation result shows that the constructed air CGF system has good performance in experiments, meeting the overall requirements. [Copyright &y& Elsevier]

Abstract: It''s used to compromise when use the way of trail-and-error or test during traditional adjust PID parameters, thus unable to achieve the ideal of output. To solve this problem, this paper uses the ITAE criterion based on simplex method; choose different objective functions while in different control systems, Through the analysis and calculation of the objective function, it can achieve values of PID parameters when the system obtains optimal output. Simulation result shows that the PID parameters optimized after ITAE criterion can satisfy the requirements of control system, the system response small overshoots and dynamic response quickly. [Copyright &y& Elsevier]

Abstract: A detail which has been omitted when modeling non-linear power amplifiers (PAs) is the time delay that exists between the input and output baseband data waveforms of the PA. The time delay should be estimated and compensated because any time delay could induce an extra dispersion of AM/AM and AM/PM characteristics of the PAs. The interpolation has been utilized for the estimation of time delay of PAs . Four kind of interpolation algorithm are used for the estimation in this paper. The simulation results show that the Sinc interpolation algorithm is more appropriate than the others for the estimation of time delay of PAs. [Copyright &y& Elsevier]

Abstract: Power Trench MOSFET (U-MOSFET) with short channel is investigated in this paper. The total specific onresistance (Rds,on) of U-MOSFET can be reduced by shortening the channel length (Lch), we compare three means of shorting channel length by optimizing the body doping profile. Electronic parameters of these structures have been obtained by process and device simulation. The results show that the conventional short channel structure is not appropriate at low gate drive conditions, the retrograde body profile and the uniform body profile structures can both reduce the Rds,on at high and low gate drive conditions, while the uniform body profile structure will not increase the threshold voltage. [Copyright &y& Elsevier]