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Applied Computer Science Volume 10, Number 4, 2014

BIG DATA: THE CURRENT WAVE FRONT OF THE TSUNAMI

In recent years, a real tsunami has flooded many human activities. Genomics, Astronomy, Particle Physics and Social Sciences are just a few examples of fields which have been intensively invaded by a massive amount of data coming from simulation, experiments or exploration. This huge pile of data requires a new way to deal with, a real paradigmatic shift respect to the past as for theories, technologies or approaches in data management. This work outlines the current wave front of Big Data, starting from a possible characterization of this new paradigm to its most compelling applications and tools, with an exploratory research of Big Data challenges in manufacturing engineering

BUCKLING OF SANDWICH CYLINDRICAL SHELL WITH CORRUGATED MAIN CORE AND THREE-LAYER FACES

The subject of numerical research is a seven-layer cylindrical shell subjected uniformly distributed external pressure. The shell is thin-walled sandwich structure composed of main corrugated core (made of a thin metal sheet) and two three-layer faces. The cores of the faces are porous and made of isotropic metal foam. The corrugation of the main core is along longitudinal axis of the shell. The shell is simply supported at its all outer edges. Numerical FEM model of the shell is elaborated. Critical pressure for the family of these shells are calculated. Furthermore, developed a model of an equivalent single-layer shell wherein diameter, and weight are the same as the seven-layer shell. It has been shown several times higher resistance to buckling of a seven-layer shell compared to the single-layer shell.

METHOD OF AUTOMATED DEVELOPMENT AND EVALUATION OF ONTOLOGIES’ QUALITIES OF KNOWLEDGE BASES

The process of automated development of base ontology is considered. It has been offered to consider the concepts and elements of ontologies for increasing the effectiveness of knowledge bases, the core of which is the ontology. Methods of specifying the weights of the relevant elements and optimization the structure of knowledge base of ontologies has been elaborated. It has been offered to evaluate the quality of the ontologies based on ISO 9126.

VIBRATION DIAGNOSTICS OF FOOTBRIDGE WITH USE OF ROTATION SENSOR

The benefits of the additional measurement of rotational degrees of free-dom on the performance of the vibration diagnosis of bridges are studied in this paper. The common vibrational diagnostics that uses translational degrees of freedom is extended by measurements of rotations. The study is curried out on a footbridge and the presence of damage as well as its location and size is determined with use of FEM updating procedure. The results showed that rotational degrees of freedom significantly improve the effectiveness of the vibrational method.

MULTIAGENT SYSTEMS IN MODULAR ROBOTICS

The article describes the use of a multi-agent system in modular robotics. Multi-agent systems originated as an extension of the field of distributed artificial intelligence which allows understanding the individual modules as independent agents. By adopting this concept, design direction, which gives the robot a new quality, which is based on the possible effective reconfigure its kinematic and functional structure, thereby taking advantage of the original robot modules generate new variants of the robot with the required new parameters and behavior.

THE IDENTIFICATION PROPERTIES OF POROUS FOAM

The aim of this work is to develop methods of describing the properties of such materials based on knowledge of: basic materials, technologies (gas pressure formed during foaming) using the theory of hyperplastic materials. The resulting description can be used for the applicability of hyperelastic models, and therefore in the whole range of deformation of the polymer-based composites and elastic composites of metals (not included plasticity). Thesis presents analysis methods of hyperelastic materials using Finite Elements Method. Using FEM it is possible to verify used material, define materials models and show effectiveness of designed component without performing expensive impact tests. Presented methods and applications of the characteristics of hyperelastic materials and composites with the gas phase are used to determine the proper selection of parameters (material properties), increasing the opportunities for a proper assessment of the effectiveness of safety devices.

A SEMANTIC FRAMEWORK FOR GRAPH-BASED ENTERPRISE SEARCH

Various recent studies have shown that in many companies workers can spend near half of their time looking for information. Effective internal search tools could make their job more efficient. However, a killer application for this type of solutions is still not available. This paper introduces an envisioned architecture, which should represent the foundations of a new generation of tools for searching information within enterprises.

ANALYSES OF HEAT TRANSFER THROUGH WALLS OF THERMAL TECHNICAL SPACES WITH COMPUTER HELPING

The paper describes research work on methods concerning heat transfers through walls of thermal technical chambers. This paper is focused on the new concept of thermal analysis derived from harmonic character of temperature changes in building environment with aspect on conductive heat transfers through walls.. The paper presents exemplary measurement results taken in Lublin region during various periods throughout a year. The purpose for the research is to point out areas subjected to the highest energy losses caused by building’s construction and geographical orientation of walls in the aspect of daily atmospheric temperature changes emerging on chamber exterior.