Online streaming feature selection: a minimum redundancy,maximum significance approach

Pattern Analysis and Applications - All the traditional feature selection methods assume that the entire input feature set is available from the beginning. However, online streaming features (OSF)...     

Optimal steganography with blind detection based on Bayesian optimization algorithm

Pattern Analysis and Applications - An optimal steganography method is provided to embed the secret data into the low-order bits of host pixels. The main idea of the proposed method is that before...     

Evaluating modes I,II, and mixed mode I-II fracture toughnesses of crystalline rocks using discrete element method

Several cracked chevron-notched Brazilian disk (CCNBD) and hollow center cracked disk (HCCD) samples of crystalline building stones naming Maroon, Baghat, and Neiriz in Iran, bearing the same calcite mineralogy and different grain size distributions were numerically modeled using three-dimensional particle flow code, with the respective microscopic mechanical properties measured through calibration technique. The simulation of CCNBD and HCCD samples highlights higher toughness compared to laboratory measurements. The values regarding HCCD samples are in a better agreement with experimental results than those regarding the CCNBD samples. The principal objective was to evaluate the reliability of numerical simulations in estimating fracture toughness and to recognize the mechanism and the mode of failure, of which laboratory tests are incapable. At microscales, failures occurring due to tensile or shear loadings may not be subsumed within any category as such at macroscales with failure modes I and II. Experimental and numerical results show that the K_IC values determined from both CCNBD and HCCD samples have a negative correlation with the grain size distributions of the marbles. However, no specific trend as such was identified for K_IIC.     

Correction to: A reliable energy-aware approach for dynamic virtual machine consolidation in cloud data centers

The Journal of Supercomputing - The spelling of Monireh H. Sayadnavard’s family name was incorrect.     

Automatic translation memory cleaning

We address the problem of automatically cleaning a translation memory (TM) by identifying problematic translation units (TUs). In this context, we treat as “problematic TUs” those containing useless translations from the point of view of the user of a computer-assisted translation tool. We approach TM cleaning both as a supervised and as an unsupervised learning problem. In both cases, we take advantage of Translation Memory open-source purifier, an open-source TM cleaning tool also presented in this paper. The two learning paradigms are evaluated on different benchmarks extracted from MyMemory, the world’s largest public TM. Our results indicate the effectiveness of the supervised approach in the ideal condition in which labelled training data is available, and the viability of the unsupervised solution for challenging situations in which training data is not accessible.     

Design and analysis of an automotive bumper beam in low-speed frontal crashes

In this paper, the most important parameters including material, thickness, shape and impact condition are studied for design and analysis of an automotive front bumper beam to improve the crashworthiness design in low-velocity impact. The simulation of original bumper under condition impact is according to the low-speed standard of automotives stated in E.C.E. United Nations Agreement, Regulation no. 42, 1994. The bumper beam analysis is accomplished for composite and aluminum material to compare the weight and impact behavior. The strength in elastic mode is investigated with energy absorption and impact force in maximum deflection situation.A good design of this part of automotives must prepare for the safety of passengers; meanwhile, should have low weight. Beside the role of safety, fuel efficiency and emission gas regulations are being more important in recent years that encourage manufacturer to reduce the weight of passenger cars.In this research, a front bumper beam made of three materials: aluminum, glass mat thermoplastic (GMT) and high-strength sheet molding compound (SMC) is studied by impact modelling to determine the deflection, impact force, stress distribution and energy-absorption behavior. The mentioned characteristics are compared to each other to find best choice of material, shape and thickness. The results show that a modified SMC bumper beam can minimize the bumper beam deflection, impact force and stress distribution and also maximize the elastic strain energy. In addition, the effect of passengers in the impact behavior is examined. The time history of the calculated parameters is showed in graphs for comparison. Furthermore, beside the above-mentioned benefits, some more advantages like easy manufacturing due to simple shape without-ribs, economical aspects by utilizing low-cost composite material and reducing weight with respect to others can be achieved by SMC material.     

Analytical solutions for bending analysis of rectangular laminated plates with arbitrary lamination and boundary conditions

The intent of the present study is to employ the extended Kantorovich method for semi-analytical solutions of laminated composite plates with arbitrary lamination and boundary conditions subjected to transverse loads. The method based on separation of spatial variables of displacement field components. Within the displacement field of a first-order shear deformation theory, a laminated plate theory is developed. Using the principle of minimum total potential energy, two systems of coupled ordinary differential equations with constant coefficients are obtained. The equations are solved analytically by using the state-space approach. The results obtained are compared with the Levy-type solutions of cross-ply and antisymmetric angle-ply laminates with various admissible boundary conditions to verify the validity and accuracy of the present theory. Also, for other laminations and boundary conditions that there exist no Levy-type solutions the present results are compared with those obtained by other investigators and finite element method. It is found that the present results have very good agreements with those obtained by other methods. This paper was recommended for publication in revised form by Associate Editor Heoung Jae Chun Ali Mohammad Naserian Nik received his M.S. in Mechanical Engineering from Ferdowsi University of Mashhad, Iran, in 2006. Currently, he is a doctoral student at the Department of Mechanical Engineering, Ferdowsi University of Mashhad, Iran. His research interests are in the area of computational mechanics and nanobiotechnology. Masoud Tahani is currently an Associate Professor at the Department of Mechanical Engineering at Ferdowsi University of Mashhad, Iran. He received his B.S. in Mechanical Engineering from Ferdowsi University of Mashhad, Iran, in 1995. He then received his M.S. and Ph.D. degrees from Sharif University of Technology, Iran, in 1997 and 2003, respectively. Dr. Tahani’s research interests include design of structures using advanced composites, mechanics of anisotropic materials, smart materials and structures, mechanics of plates and shells and biomechanics.