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optimal parameters based stochastic dot model for tone compensation of dither matrix

NEUROCOMPUTING 2016年 187卷 98-108页

作者： Su, Hai Liu, Juhua Yi, Yaohua Du, Bo Wuhan Univ Sch Printing & Packaging Wuhan 430072 Peoples R China Wuhan Univ Sch Elect Informat Wuhan 430072 Peoples R China Wuhan Univ Sch Comp Wuhan 430072 Peoples R China Univ Technol Sydney Ctr Quantum Computat & Intelligent Syst Sydney NSW 2007 Australia

The image outputs of a laser printer are accompanied with nonlinear phenomena such as dot gains and losses. As a result, a laser printer model is necessary to suppress such nonlinear distortions. This paper proposes the optimal parameters based stochastic dot model (OPSDM) and applies it to the tone compensation of dither matrices. In the proposed model, Munsell value is taken as intermediate value and a conversion method for the printouts is established at first. Then, no printer model of printout result is measured, and recurrent parameters of model are modified to obtain the optimal parameters of the stochastic dot model of printer by calculating the minimum Munsell value error between the measure result and simulated result of model. Finally, the dither matrix thresholds are modified to make the simulated result of every gray level with dither matrix close to the given level. The results of experimental indicate that the modified dither matrix with proposed model can significantly restrain the influence of the nonlinear characteristics of printer. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Printer model Munsell value optimal parameters Tone compensation

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optimal parameters of an ELM-based interval type 2 fuzzy logic system: a hybrid learning algorithm

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NEURAL COMPUTING & APPLICATIONS 2018年第4期29卷 1001-1014页

作者： Hassan, Saima Khanesar, Mojtaba Ahmadieh Jaafar, Jafreezal Khosravi, Abbas Univ Teknol PETRONAS Seri Iskandar Malaysia Kohat Univ Sci & Technol Kohat Pakistan Semnan Univ Fac Elect & Comp Engn Semnan Iran Deakin Univ Ctr Intelligent Syst Res Waurn Ponds Campus Geelong Vic Australia

An optimized design of a fuzzy logic system can be regarded as setting of different parameters of the system automatically. For a single parameter, there may exist multiple feasible values. Consequently, with the increase in number of parameters, the complexity of a system increases. Type 2 fuzzy logic system has more parameters than the type 1 fuzzy logic system and is therefore much more complex than its counterpart. This paper proposes optimal parameters for an extreme learning machine-based interval type 2 fuzzy logic system to learn its best configuration. Extreme learning machine (ELM) is utilized to tune the consequent parameters of the interval type 2 fuzzy logic system (IT2FLS). A disadvantage of ELM is the random generation of its hidden neuron that causes additional uncertainty, in both approximation and learning. In order to overcome this limitation in an ELM-based IT2FLS, artificial bee colony optimization algorithm is utilized to obtain its antecedent parts parameters. The simulation results verified better performance of the proposed IT2FLS over other models with the benchmark data sets.

关键词： Interval type 2 fuzzy logic systems optimal parameters Hybrid learning Artificial bee colony Extreme learning machine

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optimal parameters for dynamic vibration absorber with negative stiffness in controlling force transmission to a rigid foundation

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INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2019年 152卷 88-98页

作者： Huang Xiuchang Su Zhiwei Hua Hongxing Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Inst Vibrat Shock & Noise Collaborat Innovat Ctr Adv Ship & Deep Sea Explor Shanghai 200240 Peoples R China

A dynamic vibration absorber (DVA) with negative stiffness is employed to control force transmission to a rigid foundation. The differential equation of motion is established. The necessary and sufficient conditions for stability are established by Routh-Hurwitz criterion and the stability boundary is obtained. The fixed-point theory is employed to obtain the optimum parameters of DVA stiffness ratio, negative stiffness ratio and damping ratio under given mass ratio. The optimal negative stiffness ratio is obtained based on the strategy to make the solution of the smaller fixed point approach zero. The comparison with the traditional DVA, the three-parameter isolator shows that the DVA with negative stiffness performs better in both force transmission control and mass response control under harmonic and random excitations. The transfer function of the system is below unity (or the normalized static deformation) in the entire frequency range. The comparison between force transmission control and mass response control of the primary system shows that the optimal parameters are not the same for the DVA with negative stiffness. The phase difference and balance between various forces is illustrated to study the mechanism of DVA with negative stiffness. This result could provide theoretical basis for design of DVA with negative stiffness.

关键词： DVA with negative stiffness Rigid foundation Force transmission optimal parameters Mass response

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optimal parameters of the generalized symmetric SOR method for augmented systems

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JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2014年 266卷 52-60页

作者： Chao, Zhen Zhang, Naimin Lu, Yunzeng Wenzhou Univ Sch Math & Informat Sci Wenzhou 325035 Peoples R China

For the augmented system of linear equations, Zhang and Lu (2008) recently studied the generalized symmetric SOR method (GSSOR) with two parameters. In this note, the optimal parameters of the GSSOR method are obtained, and numerical examples are given to illustrate the corresponding results. (C) 2014 Elsevier B.V. All rights reserved.

关键词： optimal parameters Generalized symmetric SOR method Augmented system Convergence

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optimal parameters FOR INVITRO GROWTH OF PARVOVIRUSES

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COMPARATIVE IMMUNOLOGY MICROBIOLOGY AND INFECTIOUS DISEASES 1987年第1期10卷 25-32页

作者： WOSU, LO JAMES COOK UNIV N QUEENSLAND SCH TROP VET SCI TOWNSVILLE QLD 4811 AUSTRALIA

A procedure for optimal production or isolation of parvoviruses was found to be as follows: Indicator cells infected in suspension using a cell concentration association with full monolayer not before 3-4 days. The infected monolayer was passaged at similar cell concentrations, and the procedure repeated for up to 28 days culture of samples in this way. The optimal serum supplement used was free of or had low hemagglutination inhibitory activity to the virus studied and was used at minimal concentrations. Alternatively it was possible to remove serum supplement inhibitory activity by treatment with MnCl2 heparin dialyzed and sterilized before used as serum supplement.

关键词： optimal parameters in vitro growth parvoviruses Parvovirus croissance in vitro paramètre

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optimal parameters for 2-cyclic AOR

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APPLIED MATHEMATICS AND COMPUTATION 2010年第5期216卷 1428-1442页

作者： Tan, Xueyuan Song, Yongzhong Nanjing Normal Univ Sch Math Sci Nanjing 210097 Peoples R China

Assume A is an element of C-nxn is a 2-cyclic consistently ordered matrix and J is denoted as its associated block Jacobi iteration matrix. We consider the 2-cyclic AOR method for solving the consistent linear systems Ax=b. In the case that sigma(J(2)) is either nonnegative or nonpositive, we give detailed discussion and derive definite expressions on optimal parameters and spectral radius by efficient method. Moreover, we give some numerical examples. (C) 2010 Elsevier Inc. All rights reserved.

关键词： 2-cyclic consistently ordered matrix 2-cyclic AOR Convergence condition optimal parameters Asymptotical convergence factor

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optimal parameters for cinnabarin synthesis by Pycnoporus sanguineus

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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY 1997年第1期70卷 57-59页

作者： Smania, EFA Smania, A LoguercioLeite, C Gil, ML UNIV FED SANTA CATARINA DEPT MICROBIOL & PARASITOLBR-88040900 FLORIANOPOLISSCBRAZIL UNIV FED SANTA CATARINA DEPT BOTBR-88040900 FLORIANOPOLISSCBRAZIL

Pycnoporus sanguineus was grown in potato dextrose broth, and the environmental parameters for cinnabarin synthesis were considered. The best growth conditions for improving the production of this substance by the fun... 详细信息

关键词： Pycnoporus sanguineus cinnabarin biosynthesis optimal parameters antibiotic

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optimal parameters for Tuned Mass Dampers and Examination of Equal Modal Frequency and Damping Criteria

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JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES 2024年第5期12卷 7159-7173页

作者： Patel, Vishalkumar Bhaskarbhai Jangid, Radhey Shyam Indian Inst Technol Dept Civil Engn Mumbai India

PurposeThis work developed an idea and systematically explains 'equal modal frequency and damping' (EMFD) technique to derive the complete closed form solutions of tuned mass damper (TMD), to reduce dynamic response of structural *** optimum parameters for the damped system till date required numerical search technique or shootout technique, which is the trial-error method, of-course add complexity in selecting parameter obtained at optimality conditions. The study of optimum parameter based on EMFD shows the complete closed-form solution, independent to another optimum *** parameters solely depend on structural damping and mass ratio. The study reveals the multiple optimal solutions. This work investigates the various optimal parameters under harmonic excitation, also compare same with relevant researchers. To confirm its robustness under random excitation various real earthquake time history loads are applied to investigate behavior of different solutions. A demonstration of the shear building for harmonic and random excitation for various solutions provides valuable practical insights for the research ***, the article presents a novel method for finding optimal parameters efficiently without requiring numerical calculations at any stages. The significance of multiple optimal solutions becomes evident when structural systems face random excitation.

关键词： Tuned mass damper Equal modal optimal parameters SDOF MDOF

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optimal parameters of tuned mass dampers for an inverted pendulum with two degrees of freedom

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF MULTI-BODY DYNAMICS 2021年第2期235卷 281-293页

作者： Nguyen, Duy-Chinh Hung Yen Univ Technol & Educ Fac Mech Engn Hung Yen Vietnam

In reality, an inverted pendulum can be used to model many real structures as the fluid tower, super-tall buildings, or articulated tower in the ocean, etc. However, for the inverted pendulum with two degrees of freedom, to the best knowledge of the author, there is no study to determine optimal parameters of two tuned mass dampers (TMD) by using the maximization of equivalent viscous resistance method. Therefore, the current study presents the analytical solutions to the optimization of two orthogonal TMDs, which is used to eliminate vibration of the inverted pendulum with two degrees of freedom. The parameters considered in optimizing are the natural frequency ratios and damping ratios of the two TMDs. The new results of this paper can be summarized as follows: Firstly, the equivalent resistance forces of the two TMDs acting on the inverted pendulum with two degrees of freedom are established. Secondly, the quadratic torque matrices of the vibration response of the inverted pendulum attached with two TMDs is revealed. Thirdly, the optimal expressions are derived using the maximization of equivalent viscous resistance method. The obtained formulae provide exact solutions for the proposed problem. Finally, to confirm the effectiveness of the obtained formulae, parametric studies on vibration are performed for sample articulated tower in the ocean with and without optimal TMDs. Numerical results show that vibrations of the articulated tower attached with optimal TMDs are effectively eliminated. This confirms that the optimal parameters of the two TMDs are determined in this paper are reliable and accurate.

关键词： inverted pendulum optimal parameters damping ratios tuned mass damper two degrees of freedom equivalent viscous resistance method

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optimal parameters and Characteristics of Shunted Piezoelectric System with Negative Capacitance in Series

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International Conference on Frontiers of Manufacturing and Design Science (ICFMD2010)

作者： Zhang, Wenqun Wu, Xinyue Cao, Wen Naval Univ Engn Coll Marine Architecture & Naval Power Wuhan Peoples R China Wuhan Environm Protect Sci Res Inst Hubei Peoples R China

ISBN: (纸本)9783037850046

Piezoelectric system shunted with proper negative capacitance in series has low dynamic stiffness. According to frequency characteristic equations of the piezoelectric system, optimal parameters and characteristics of both shunted series structures were deduced and compared theoretically. One is negative-capacitance and resistance in series, and the other is negative-capacitance, resistance and inductance in seires. It presented that high damping characteristic can be obtained at low frequencies when shunted with series negative-capacitance. If proper inductance is included in shunt circuit, effective bandwidth could be extended and the peak of amplitude of response is decreased, what' more, the stability of this structure is enhanced. This technology can be used in vibration isolators or sensors and the shunt structure including inductance is recommended.

关键词： piezoelectric negative capacitance damping optimal parameters

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