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IEEE/CAA Journal of Automatica Sinica 2019年第5期6卷 1139-1151页

作者： Ali Azarbahram Amir Amini Mahdi Sojoodi the Department of electrical and computer engineering Ferdowsi University of MashhadMashhadIran the Department of electrical and computer engineering Concordia UniversityMontrealQCCanada the faculty of electrical and computer engineering Tarbiat Modares UniversityTehran14115-143Iran

The paper proposes a novel H∞ load frequency control(LFC) design method for multi-area power systems based on an integral-based non-fragile distributed fixed-order dynamic output feedback(DOF) tracking-regulator control scheme. To this end, we consider a nonlinear interconnected model for multiarea power systems which also include uncertainties and timevarying communication delays. The design procedure is formulated using semi-definite programming and linear matrix inequality(LMI) method. The solution of the proposed LMIs returns necessary parameters for the tracking controllers such that the impact of model uncertainty and load disturbances are minimized. The proposed controllers are capable of receiving all or part of subsystems information, whereas the outputs of each controller are local. These controllers are designed such that the resilient stability of the overall closed-loop system is guaranteed. Simulation results are provided to verify the effectiveness of the proposed scheme. Simulation results quantify that the distributed(and decentralized) controlled system behaves well in presence of large parameter perturbations and random disturbances on the power system.

关键词： Dynamic output feedback control interconnected multi-area power systems load frequency control linear matrix inequalities power system control

A low-voltage and energy-efficient full adder cell based on carbon nanotube technology

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Nano-Micro Letters 2010年第2期2卷 114-120页

作者： Keivan Navi Rabe'e Sharifi Rad Mohammad Hossein Moaiyeri Amir Momeni faculty of electrical and computer engineering Shahid Beheshti UniversityGC

Scaling problems and limitations of conventional silicon transistors have led the designers to exploit novel nano-technologies. One of the most promising and feasible nano-technologies is CNT(Carbon Nanotube) based transistors. In this paper, a high-speed and energy-efficient CNFET(Carbon Nanotube Field Effect Transistor) based Full Adder cell is proposed for nanotechnology. This design is simulated in various supply voltages, frequencies and load capacitors using HSPICE circuit simulator. Significant improvement is achieved in terms of speed and PDP(Power-Delay-Product) in comparison with other classical and state-of-the-art CMOS and CNFET-based designs, existing in the literature. The proposed Full Adder can also drive large load capacitance and works properly in low supply voltages.

关键词： CNFET Low-Voltage Full-Adder Minority-Function Nanotechnology

Optimal PD/PID control of smart base isolated buildings equipped with piezoelectric friction dampers

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Earthquake engineering and engineering Vibration 2013年第1期12卷 39-54页

作者： Sadegh Etedali Mohammad Reza Sohrabi Saeed Tavakoli .Department of Civil engineering Faculty of EngineeringUniversity of Sistan and Baluchestan Department of Civil engineering Faculty of EngineeringUniversity of Sistan and Baluchestan faculty of electrical and computer engineering University of Sistan and Baluchestan

Long-period pulses in near-field earthquakes lead to large displacements in the base of isolated *** dissipate energy in isolated structures using semi-active control,piezoelectric friction dampers（PFD） can be *** performance of a PFD is highly dependent on the strategy applied to adjust its contact *** this paper,the seismic control of a benchmark isolated building equipped with PFD using PD/PID controllers is *** genetic algorithms,these controllers are optimized to create a balance between the performance and robustness of the closed-loop structural *** advantage of this technique is that the controller forces can easily be *** addition,the structure is equipped with only a single sensor at the base floor to measure the base *** seven pairs of earthquakes and nine performance indices,the performance of the closed-loop system is ***,the results are compared with those given by two well-known methods：the maximum possive operation of piezoelectric friction dampers and LQG *** simulation results show that the proposed controllers perform better than the others in terms of simultaneous reduction of floor acceleration and maximum displacement of the ***,they are able to reduce the displacement of the isolator systems for different earthquakes without losing the advantages of isolation.

关键词： seismic isolation semi-active control piezoelectric friction dampers PD/PID controllers

Defect-Tolerant Mapping of CMOL Circuit Targeting Delay Optimization

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Journal of computer Science & Technology 2021年第5期36卷 1118-1132页

作者： Xiao-Jing Zha Yin-Shui Xia Shang-Luan Xie Zhu-Fei Chu faculty of electrical engineering and computer Science Ningbo UniversityNingbo 315211China

In view of the significant number of defective nanodevices in the Cmos/nanowire/MOLecular hybrid(CMOL)circuit,defect-tolerant mapping is an essential step to achieve correct logic operations in defective CMOL ***,less effort has been made to improve circuit delay by defect-tolerant *** this paper,the factors affecting the delay of mapped circuits are analyzed,and the path-tree based defect-tolerant mapping method for the delay optimization is *** the logic-domain,the terminology of the path tree is presented,and the logic circuit is first partitioned into multiple path ***,the mapping areas in the physic-domain are pre-planned for(near)critical path *** the mapping process,the specific mapping modes and an updating strategy are formulated to map the path trees:inputs are mapped based on input sorting;(near)critical path trees are mapped with priority,while the others are mapped in a hierarchical ***,an improved tabu search algorithm is employed to verify the validity of the proposed defect-tolerant mapping *** evaluations on the ISCAS benchmarks show that the proposed method can reduce circuit delay by 15.22%.

关键词： nanohybrid circuit defect-tolerant mapping delay optimization

A Semi-Tensor Product Based All Solutions Boolean Satisfiability Solver

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Journal of computer Science & Technology 2023年第3期38卷 702-713页

作者：潘鸿洋储飞 faculty of electrical engineering and computer Science Ningbo UniversityNingbo 315211China

Boolean satisfiability (SAT) is widely used as a solver engine in electronic design automation (EDA). Typically, SAT is used to determine whether one or more groups of variables can be combined to form a true formula. All solutions SAT (AllSAT) is a variant of the SAT problem. In the fields of formal verification and pattern generation, AllSAT is particularly useful because it efficiently enumerates all possible solutions. In this paper, a semi-tensor product (STP) based AllSAT solver is proposed. The solver can solve instances described in both the conjunctive normal form (CNF) and circuit form. The implementation of our method differs from incremental enumeration because we do not add blocking conditions for existing solutions, but rather compute the matrices to obtain all the solutions in one pass. Additionally, the logical matrices support a variety of logic operations. Results from experiments with MCNC benchmarks using CNF-based and circuit-based forms show that our method can accelerate CPU time by 8.1x (238x maximum) and 19.9x (72x maximum), respectively.

关键词： all solutions Boolean satisfiability(AllSAT) semi-tensor product of matrices conjunctive normal form(CNF)satisfiability circuit satisfiability

Effects of fractional-order PI controller on delay margin in single-area delayed load frequency control systems

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 380-389页

作者： Vedat CELIK Mahmut Temel OZDEMIR Kwang Y.LEE Department of electrical and Electronics engineering Faculty of EngineeringFirat UniversityElazigTurkey Department of electrical and computer engineering Baylor UniversityWacoUSA

This study aims to determine the improvement effect on the delay margin if fractional-order proportional integral(PI) controller is used in the control of a singlearea delayed load frequency control(LFC) system. The delay margin of the system with fractional-order PI control has been obtained for various fractional integral orders and the effect of them has been shown on the delay margin as a third controller parameter. Furthermore,the stability of the system that is either under or over the delay margin is examined by generalized modified Mikhailov *** stability results obtained have been confirmed numerically in time domain. It is demonstrated that the proposed controller for delayed LFC system provides more flexibility on delay margin according to integer-order PI controller.

关键词： Delay dependent stability Delay margin Fractional-order proportional integral(PI) Generalized modified Mikhailov criterion Load frequency control with delay

Inversion Optimization Strategy Based on Primitives with Complement Attributes

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Journal of computer Science & Technology 2021年第5期36卷 1145-1154页

作者： Hui-Ming Tian Zhu-Fei Chu faculty of electrical engineering and computer Science Ningbo UniversityNingbo 315211China

Inverters or logic primitives that have complement attributes are essential to building a logical complement *** and NOR operations which have complement attributes are of high interest for complementary metal-oxidesemiconductor(CMOS)technology,as they can be easily implemented in *** from the logic models used in standard CMOS,several nano-emerging technologies,such as quantum-dot cellular automata(QCA)and spin torque majority gates,are in favor of realizing a majority voter function but imposing difficulties in implementing *** studies pay lots of effort in optimizing the number of inverters in logic representations,whereas the mapping using primitives with complement attributes is not a major *** this paper,we establish a technology mapping method from logic representations to nanotechnology primitives by considering NAND-NOR-Inverter(NNI)and exclusive-NOR(XNOR)*** adopt XOR-Majority Graph(XMG)as a logic *** proposed mapping method is evaluated using the QCA *** results over EPFL benchmark suites show we achieve 11.77%and 30.13%reductions in the area and the number of inverters,respectively.

关键词： inversion optimization quantum-dot cellular automata majority-of-three NAND-NOR-Inverter(NNI)

A capillary force model for interactions between two spheres

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Particuology 2011年第4期9卷 381-386页

作者： Amir Farrokh Payam Morteza Fathipour Nano-Electronics Center of Excellence School of Electrical & Computer Engineering Faculty of Engineering University of Tehran

Based on the method of energy principle, an analytical approach for computing the capillary force for sphere/sphere geometry is presented in this paper. In modeling the capillary force, we consider spheres with both equal and non-equal radii, for both symmetric and asymmetric configurations at liquid/solid interfaces. We use numerical analysis to investigate the validity and efficiency of the derived model. The effect of various parameters including humidity, distance between two spheres, radii of spheres and contact angles on the meniscus force are investigated. Finally the results obtained from the model are compared with experimental measurements, and the accuracy and precision of the presented approach is verified.

关键词： Interaction Capillary force Humidity Energy methods Sphere particle

Applying memetic algorithm-based clustering to recommender system with high sparsity problem

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Journal of Central South university 2014年第9期21卷 3541-3550页

作者： MARUNG Ukrit THEERA-UMPON Nipon AUEPHANWIRIYAKUL Sansanee Department of electrical engineering Faculty of Engineering Chiang Mai University Department of computer engineering Faculty of Engineering Chiang Mai University

A new recommendation method was presented based on memetic algorithm-based clustering. The proposed method was tested on four highly sparse real-world datasets. Its recommendation performance is evaluated and compared with that of the frequency-based, user-based, item-based, k-means clustering-based, and genetic algorithm-based methods in terms of precision, recall, and F1 score. The results show that the proposed method yields better performance under the new user cold-start problem when each of new active users selects only one or two items into the basket. The average F1 scores on all four datasets are improved by 225.0%, 61.6%, 54.6%, 49.3%, 28.8%, and 6.3% over the frequency-based, user-based, item-based, k-means clustering-based, and two genetic algorithm-based methods, respectively.

关键词： memetic algorithm recommender system sparsity problem cold-start problem clustering method

Coordination of PSS and TCSC controller using modified particle swarm optimization algorithm to improve power system dynamic performance

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Journal of Zhejiang university-Science C(computers and Electronics) 2010年第8期11卷 645-653页

作者： Alireza REZAZADEH Mostafa SEDIGHIZADEH Ahmad HASANINIA faculty of electrical and computer engineering Shahid Beheshti University faculty of engineering and Technology Imam Khomeini International University

This paper develops a modified optimization procedure for coordination of a power system stabilizer (PSS) and a thyristor controlled series compensator (TCSC) controller to enhance the power system small signal *** new approach employs eigenvalue-based and time-domain simulation based objective functions simultaneously to improve the optimization convergence rate.A modified particle swarm optimization (MPSO) algorithm is used as the optimization *** results of simulations and eigenvalue analysis for a single machine infinite bus (SMIB) system equipped with the proposed PSS and TCSC controllers confirm that the new approach is effective in enhancing the system stability.

关键词： Coordination Particle swarm optimization (PSO) Power system stabilizer (PSS) Small signal stability Thyristor controlled series compensator (TCSC) controller