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International Conference on control, Automation and systems ( ICCAS)

作者： Mohsen Khalili Mohammad Haeri Ali Reza Doodman Tipi Advanced Control System Lab Electrical Engineering Department Sharif University of Technology Tehran Iran Kermanshah University of Technology Kermanshah Iran

In the welding process, droplet detachment regularity is important for a good welding quality. The frequency of detachment is one of influential indices for assessing the quality of GMAW in the globular transfer mode. In this paper, a relationship is estimated for measuring droplet detachment frequency in the globular GMAW. The droplet detachment frequency is estimated with a curve fitting by the least squares error (LSE) method. By using short time frequency transform (STFT) we can extract the frequency contents from the mass of drop that is one of the states in the welding model.

关键词： Welding Time frequency analysis Wire Frequency estimation Feeds Metals

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Gas Metal Arc Welding process control based on arc length and arc voltage

Gas Metal Arc Welding process control based on arc length an...

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International Conference on control, Automation and systems ( ICCAS)

作者： Mohammad Mousavi Anzehaee Mohammad Haeri Ali Reza Doodman Tipi Department of Electrical Engineering Science and Research Branch Islamic Azad University Tehran Iran Advanced Control System Lab Electrical Engineering Department Sharif University of Technology Tehran Iran Kermanshah University of Technology Kermanshah Iran

In this paper, we present a method to dynamically observe two important variables of a Gas Metal Arc Welding (GMAW) process, i.e. arc voltage and arc length. To do this, we use Kalman filter to estimate these two vari... 详细信息

关键词： Welding Kalman filters Estimation Noise Current measurement Noise measurement Voltage measurement

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Adaptive iterative learning control for a class of iteration-varying nonlinear systems with known periodicity

Adaptive iterative learning control for a class of iteration...

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2009 International Conference on Test and Measurement, ICTM 2009

作者： Chenkun, Yin Zhongsheng, Hou Advanced Control System Lab School of Electronics and Information Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424447008

In this paper, a class of iteration-varying nonlinear system to track a non-repetitive desired trajectory is addressed using a new adaptive iterative learning control. The iteration-variance in parameter is described by a special kind of periodicity in iteration domain. The convergent result is elaborately proven using composite energy function. © 2009 IEEE.

关键词： Nonlinear systems

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Fair resource allocation in Ad Hoc networks in the presence of delay

Fair resource allocation in Ad Hoc networks in the presence ...

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IEEE India Conference (INDICON)

作者： Zeynab Naseri Mohammad Haeri Advanced Control System Lab Electrical Engineering Department Sharif University of Technology Tehran Iran

In this paper, the problem of resource allocation at an Ad hoc network with nodes not using any infrastructure to cooperate with each other is considered. By using a simple interference model in wireless links, the convergence and stability of a fair resource allocation scheme in the absence of delay is investigated. Also, the local stability of the scheme in the presence of upper-bounded delay is verified. Simulations results illustrate the convergence and fairness of this scheme considering different initial states for different sources. The performance of the scheme in the presence of different disturbances for each flow in transient and steady state along with its local stability in the presence of upper-bounded delay is also examined.

关键词： Resource management Ad hoc networks Interference Wireless networks Delay Stability Feedback Base stations Electronic mail Convergence

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Estimating the fractional order of orthogonal rational functions used in the identification

Estimating the fractional order of orthogonal rational funct...

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International Conference on control, Automation and systems ( ICCAS)

作者： Narges Nazari Mohammad Haeri Mohammad Saleh Tavazoei Advanced Control System Lab Department of Electrical Engineering Sharif University of Technology Tehran Iran

This paper deals with the identification of fractional order systems via orthogonal rational functions. These functions have widely been used in system identification of classical integer order systems. It has been shown that due to some properties such as the presence of non-exponentional aperiodic multimodes in the fractional order systems, it is much better to use fractional orthogonal rational functions in approximation of these systems. One problem which arises in this area is the estimation of fractional order of these orthogonal rational functions. In the existing methods, these parameters have been found by trial and error which requires a large amount of calculations. To reduce the computational effort, a new strategy is suggested in the present work to estimate the fractional order. The proposed strategy is constructed based on pre-processing the step response of the system in hand.

关键词： control systems Automatic control system identification Fractional calculus Magnetic materials Automation Differential equations Damping Viscosity Elasticity

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Adaptive congestion estimation and control in active queue management

Adaptive congestion estimation and control in active queue m...

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International Conference on control, Automation and systems, ICCAS 2007

作者： Ostadabbas, Sarah Haeri, Mohammad Advanced Control System Lab. Department of Electrical Engineering Sharif University of Technology Tehran Iran Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)8995003871

Active Queue Management (AQM) policies provide an early indication of incipient congestion to the source. In this paper, we propose a new AQM policy that predicts the instantaneous queue length at next time instant using adaptive filtering technique. To use the algorithm in fast routers, we reduce its computational complexity using a direct method to compute the manipulating signals. We show that adaptive congestion estimation is able to control the oscillations in the instantaneous queue length. We compare the performance of our method with respect to other well-known AQM methods such as RED and PI which are also simulated by MATlab. We also compare the computational complexity of these algorithms with each other. © ICROS.

关键词： Computational complexity

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The Tastemakers: Semonyx Targets Taste Receptors

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CHEMISTRY & BIOLOGY 2009年第11期16卷 1123-1124页

作者： Wolfson, Wendy Main Text Our society is awash with cheap food high in calories and salt. Currently over two thirds of Americans are overweight with a third considered obese. Consumer advocacy groups are lobbying food manufacturers to market healthier foods and drinks even pushing taxes on sugary sodas. But genomics advances could indirectly save our cookies as molecular biology meets taste perception. Unfortunately stripping the sugar fat and salt also strips away taste. But genomics advances could indirectly save our cookies as molecular biology meets taste perception. Companies like San Diego-based Semonyx (http://***) are using drug discovery techniques to engineer a new generation of taste enhancers that can fool our tastebuds. Senomyx targets G protein-coupled receptors for sweet bitter and savory tastes and ion channels for saltiness. In addition the company is developing bitter blockers and menthol cooling agents. “I think there is great interest in big food and fragrance companies and entrepreneurial companies like Senomyx and Redpoint to try to find technological ways to make food healthier.” said Gary Beauchamp Ph.D. director of the Monell Chemical Senses Center. “The trouble is that if you look at the history of public health organizations telling you to eat a healthier diet the results are not very encouraging.” Good Taste Is a Matter of Perception Humans can taste five different tastes: sweet sour bitter salty and umami (savory). It has long been known that taste is linked to sense of smell. Research groups continue to explore the function of distinct taste receptors on the tongue and on the lining of the gut. The human sweet receptor is comprised of two proteins T1R2 and T1R3 expressed on the surface of particular taste receptor cells. Savory taste receptors consist of T1R1 and T1R3 proteins. The selectivity of these heterodimeric receptors for sweet or savory is determined by the combination of receptor subunits. The T1R3 protein is used by both the sweet and savory taste recepto

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Adaptive congestion estimation and control in active queue management

Adaptive congestion estimation and control in active queue m...

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International Conference on control, Automation and systems ( ICCAS)

作者： Sarah Ostadabbas Mohammad Haeri Advanced Control System Lab Department of Electrical Engineering Sharif University of Technology Tehran Iran Department of Electrical Engineering Sharif University of Technology Tehran Iran

关键词： Programmable control Adaptive control Computational complexity Automatic control control systems Feedback Conference management Technology management Engineering management Computational modeling

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Direct-DMC for AQM computational complexity reduction in TCP/IP networks

Direct-DMC for AQM computational complexity reduction in TCP...

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International Conference on control, Automation and systems ( ICCAS)

Active queue management (AQM) mechanisms are designed to provide better support for end-to-end congestion control mechanisms of transmission control protocol (TCP) in TCP/IP networks. This paper introduces direct dynamic matrix control (D-DMC) as a new AQM method in dynamic TCP networks. Ability of the controller in handling system delay along with its simplicity and low computational loads makes D-DMC a privileged AQM method in high speed networks. The controller is designed based on a small signal linearized fluid-flow model of TCP/AQM networks. The computational complexity analysis as well as the MATlab simulation results shows the out-performance of the developed controller for both queue regulation and complexity reduction. Fast response, low queue fluctuations (and consequently low delay jitter), and low packet marking probability are other features of the developed method with respect to other well-known AQM methods such as RED and PI which are also simulated for comparison.

关键词： Computational complexity TCPIP IP networks Fluid dynamics Computer network management Protocols control systems Delay systems Computer networks High-speed networks

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Comparison of two Detection Algorithms for Pipeline Leaks

Comparison of two Detection Algorithms for Pipeline Leaks

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IEEE Conference on control Technology and Applications (CCTA)

作者： O. Begovich A. Navarro E. N. Sanchez G. Besancon Research and Advanced Studies Center National Polytechnic Institute Guadalajara Jalisco Mexico Control System Departament (ex-LAG) GIPSA-lab ENSIEG Saint Martin d'Heres France

The aim of this paper is to compare two analytic detection algorithms for pipeline leaks in order to assess their effectivity. Parameters such as precision and velocity to detect and locate a leak, algorithm complexity, and application facilities are evaluated, with the purpose of finding the most useful algorithm for a future real-time implementation on a Mexican aqueduct.

关键词： Detection algorithms Pipelines Leak detection control systems Algorithm design and analysis Fluid flow measurement Pressure measurement Noise robustness Environmental economics Acoustic signal detection

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