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Cryptanalysis of Chaotic Masking Secure Communication Systems Using an Adaptive Observer

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2008年第11期55卷 1183-1187页

作者： Liu, Ying Tang, Wallace K. S. City Univ Hong Kong Dept Elect Engn Kowloon Hong Kong Peoples R China

This paper carries out a further cryptanalysis of two Lorenz-based masking secure communication systems, which have been recently attacked by a high-pass filter. As demonstrated with our simulations, high-pass filter attack works well only when the covered information signal is monotonic. However, with an adaptive observer, it is still possible to coarsely obtain the information signal and correctly identify the system user-defined parameters if a multitonic information signal is transmitted,, making the security of these two systems questionable.

关键词： Adaptive observer adaptive synchronization cryptanalysis minimization algorithm secure communication

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minimization algorithm of fuzzy finite automata

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FUZZY SETS AND SYSTEMS 2004年第3期141卷 439-448页

作者： Cheng, W Mo, ZW Sichuan Normal Univ Dept Math Chengdu 610066 Peoples R China Chinese Acad Sci Inst Automat Beijing 100080 Peoples R China SW JiaoTong Univ Dept Appl Math Chengdu 610031 Peoples R China

In this paper, a class of fuzzy finite automata corresponding to the Mealy type of ordinary automata is formulated, and also two types of statewise equivalence relations are introduced. From the equivalence relations, a minimal form is defined and a minimization algorithm of the Mealy type of fuzzy finite automata is obtained. (C) 2003 Elsevier B.V. All rights reserved.

关键词： fuzzy finite automata Mealy type of fuzzy finite automata minimization minimization algorithm

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minimization of states in automata theory based on finite lattice-ordered monoids

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INFORMATION SCIENCES 2007年第6期177卷 1413-1421页

作者： Lei, Hongxuan Li, Yongming Shaanxi Normal Univ Coll Comp Sci Xian 710062 Peoples R China Shaanxi Normal Univ Coll Math & Informat Sci Xian 710062 Peoples R China Neijiang Teachers Coll Dept Math Neijiang 641112 Peoples R China

In this study, we consider a concept of complete L-fuzzy matrix, define complete lattice-valued finite automata (CLFAs) and study their properties. The definitions of statewise equivalence relations and automata equivalence relations of a CLFA are given, two algorithms are aimed at the minimization of states of a CLFA. (c) 2006 Elsevier Inc. All rights reserved.

关键词： lattice-ordered monoid L-fuzzy matrix fuzzy finite automata equivalence minimization algorithm

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Estimation of concentration-dependent diffusion coefficient in drying process from the space-averaged concentration versus time with experimental data

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CHEMICAL ENGINEERING SCIENCE 2006年第22期61卷 7185-7198页

作者： Loulou, Tahar Adhikari, B. Lecomte, D. Univ Bretagne Sud LETZE Ctr Rech F-56321 Lorient France Univ Queensland Chem Environm Engn Dept Brisbane Qld 4072 Australia Ecole Mines Albi Carmaux Lab Genie Proc F-81013 Albi France Ecole Mines Albi Carmaux CNRS UMR 2392 Solides Div F-81013 Albi 09 France

The estimation of a concentration-dependent diffusion coefficient in a drying process is known as an inverse coefficient problem. The solution is sought wherein the space-average concentration is known as function of time (mass loss monitoring). The problem is stated as the minimization of a functional and gradient-based algorithms are used to solve it. Many numerical and experimental examples that demonstrate the effectiveness of the proposed approach are presented. Thin slab drying was carried out in an isothermal drying chamber built in our laboratory. The diffusion coefficients of fructose obtained with the present method are compared with existing literature results. (c) 2006 Elsevier Ltd. All rights reserved.

关键词： inverse problem diffusion coefficient drying process minimization algorithm averaged measured concentration

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Determination of the kinetic parameters of atom transfer radical polymerizations

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MACROMOLECULES 2004年第25期37卷 9395-9401页

作者： Kwark, YJ Novak, BM N Carolina State Univ Dept Chem Raleigh NC 27612 USA Univ Massachusetts Dept Polymer Sci & Engn Amherst MA 01003 USA

In an attempt to find a novel catalyst system for atom transfer radical polymerization (ATRP), a parameter estimation method based on nonlinear regression was developed to evaluate various catalyst systems by determining kinetic parameters of polymerization. From our model system considering small molecular atom transfer addition reaction, we found that equilibrium constant of atom transfer reaction could be successfully determined using our parameter estimation method. However, the each value of activation rate constant and deactivation reaction constant is hard to be determined ubiquitously because of the poor sensitivities of them and the local minima trapping. By applying second minimization algorithm, the parameter estimation algorithm achieves higher propensity to reach global minimum, yet not all the time. The simulation results using kinetic rate constants determined by our method shows better agreement with the experimental data than that using literature values. This is because the current method uses fewer assumptions than other literature methods in determining rate constants. We also demonstrated the determination of kinetic constants in the polymerization of styrene and MMA using various metal catalysts, and the simulations using these kinetic constants agree well with the experimental data.

关键词： .polymerization of styrene catalyst system equilibrium constant Radical polymerizations simulation results sensitivities minima simulations using global minimum kinetic constants parameter estimation algorithm atom transfer reaction minimization algorithm using literature MMA using

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The static output feedback stabilization problem as a concave-convex programming problem

The static output feedback stabilization problem as a concav...

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American Control Conference

作者： Astolfi, A Colaneri, P Univ London Imperial Coll Sci Technol & Med Dept Elect Engn London SW7 2AZ England

ISBN: (纸本)0780383354

It is shown that the static output feedback stabilization problem for linear multi-input single-output (MISO) systems can be posed as a concave-convex programming problem. This allows the potential design of minimization algorithms yielding a stabilizing static output feedback gain, if it exists, or showing that the problem is not solvable at all.

关键词： feedback stability concave programming convex programming multivariable control systems minimisation static output feedback stabilization concave convex programming problem linear multiinput single output system minimization algorithm

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Achieving diagonal dominance by frequency interpolation

Achieving diagonal dominance by frequency interpolation

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American Control Conference

作者： Nobakhti, A Munro, N Univ Manchester Inst Sci & Technol Control Syst Ctr Manchester M60 1QD Lancs England

ISBN: (纸本)0780383354

This paper proposes a new method for systematic construction of dynamic pre-compensators to achieve better diagonal dominance. Curve fitting is used to construct a dynamic pre-compensator element-by-element, meaning unlike most minimization algorithms, there is no restriction on the structure of each element. To demonstrate its effectiveness, the method is applied to the Rolls-Royce Spey gas-turbine engine, which is a highly interacting and multivariable system.

关键词： interpolation curve fitting multivariable control systems compensation control system synthesis gas turbines engines diagonal dominance frequency interpolation dynamic precompensators minimization algorithm Rolls-Royce Spey gas turbine engine multivariable system interacting system

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Characterizing the complexity of Boolean functions represented by well-structured graph-driven parity-FBDDS

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RAIRO-THEORETICAL INFORMATICS AND APPLICATIONS 2002年第3期36卷 229-247页

作者： Brosenne, H Homeister, M Waack, S Univ Gottingen Inst Numer & Angew D-37083 Gottingen Germany

We investigate well-structured graph-driven parity-FBDDs, which strictly generalize the two well-known models parity OBDDs and well-structured graph-driven FBDDs. The first main result is a characterization of the complexity of Boolean functions represented by well-structured graph-driven parity-FBDDs in terms of invariants of the function represented and the graph-ordering used. As a consequence, we derive a lower bound criterion and prove an exponential lower bound for certain linear code functions. The second main result of this paper is a polynomial time algorithm that minimizes the number of nodes in a graph-driven parity-FBDD.

关键词： well-structured graph-driven parity-FBDDs lower bounds minimization algorithm complexity theory data structures for Boolean functions

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Obstacle reconstruction in acoustics: Error analysis of an inversion algorithm set in the subspace of outgoing spherical wave functions

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NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS 1997年第6期30卷 3481-3492页

作者： Crosta, GF Univ Milan DISAT I-20126 Milan Italy

No abstract available

关键词： inverse acoustics shape identification back propagation boundary defect minimization complete families T-matrix schemes far field coefficients boundary coefficients convergence results axially symmetric obstacle minimization algorithm numerical methods

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Variational principle with nonlinear complementarity for three-dimensional contact problems and its numerical method

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SCIENCE IN CHINA SERIES A-MATHEMATICS PHYSICS ASTRONOMY 1996年第5期39卷 528-539页

作者： Chen, WJ Chen, GQ Feng, EM Research Institute of Engineering Mechanics Dalian University of Technology Dalian 116023 China

Variational principles with nonlinear complementarity and finite-dimensional nonlinear complementarity models for three-dimensional frictional contact problems are established. The existence and uniqueness of the solutions to the finite-dimensional models are proved. A minimum principle is developed and a minimization algorithm is presented. Numerical calculation shows that the algorithm is highly efficient, reliable and promising.

关键词： three-dimensional frictional contact problems nonlinear complementarity variational principle minimization algorithm convergence

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