Showing papers in "Applied Computer Science in 2016"

Perspectives for Fog Computing in Manufacturing

Abstract: This article discusses ongoing efforts to enable the fog computing vision in manufacturing. As a new paradigm of computing implementation of fog computing faces many challenges that open perspective of new applications within a field of manufacturing. It is expected that fog computing will be one of factors that will accelerate development of in forth industrial revolution. In this article we discuss the perspectives of manufacturing companies surrounded by new solutions of CPS, CPPS and CM in relation

Improving manufacturing processes using simulation methods

Abstract: Computer simulation is a very important method for studying the efficiency of manufacturing systems. This paper presents the results of simulation research about how buffer space allocated in a flow line and operation times influence the throughput of a manufacturing system. The production line in the study consists of four stages and is based on a real machining manufacturing system of a small production enterprise. Using Tecnomatix Plant Simulation software, a simulation model of the system was created and set of experiments was planned. Simulation experiments were prepared for different capacities of intermediate buffers located between manufacturing resources (CNC machines) and operation times as input parameters, and the throughput per hour and average life span of products as the output parameter. On the basis of the experiments, the impact of the allocation of intermediate buffer capacities on production efficiency is analysed.

The design and structural analysis of the endoprosthesis of the hip joint

Abstract: The paper presents results of the preliminary structural analysis of model of the endoprosthesis of the hip joint. Basics of anatomy and biomechanical analysis of the hip joint were introduced. Based on data from atlas of human anatomy and medical imaging, the prototype of endoprosthesis was modelled using Solid Edge ST8 software. After determining physical properties of structural materials, the Finite Elements Analysis of the model was conducted using in SolidWorks software under various load conditions. Finally the results of analysis are presented.

Case Studies on Big Data

Abstract: The main idea of the Data Mining (DM) is nowadays as follows: overcoming of the Big Data problematics is possible under use of "data compression" via their transformation into (fuzzy) knowledge. The “heavy-weighting approaches” involving precise analytical techniques and expensive specialized software are used for this aim. On the other hand, there is the opportunity to solve the Big Data problem under use of some “light-weighting approaches” based on agility: freeware, multipurpose techniques, minimal challenges on the personnel training and competencies! The paper examines the techniques and case studies on the both topics. The “heavy-weighting approaches” (ontologies, knowledge bases, fuzzy logic and fuzzy knowledge bases) are compared to light-weighting one. The existing reference solutions are discussed.

Modeling of Flow and Temperature Field in an Economizer

Abstract: This article deals with the economizer as one of the main parts of a boiler. Economizers and air heaters perform a key function in providing high overall boiler thermal efficiency by recovering the low level energy from the flue gas before it is exhausted to the atmosphere. The most common and reliable economizer design is the bare-tube, in-line, cross-flow type. To reduce capital costs, most boiler manufacturers build economizers with a variety of designs to enhance the controlling gas-side heat transfer rate. From this point of view it creates a lack for an investigation and modeling of these parts.

Modelling of Characteristics of Turning of Shafts with Low Rigidity

Abstract: Numerical studies were conducted with the use of a computer program permitting the determination of the basic dynamic characteristics of the process of machining and the presentation of graphic characteristics of the numerical simulations performed. Analysis was performed of the relation of the output parameters of the dynamic system to the input parameters, relative stiffness coefficient B to feed rate and depth of machining, change of retardation and time constants to rotary speed and depth of machining, and of the frequency and time characteristics of models of the dynamic system of machining of shafts with low rigidity.

Mentally challenged as design principles and models for their applications

Abstract: Tablet computers have become a common part of our life style. Since 2012, inspired by the success of touch devices in special education, we have established and led the IT therapy program for the mentally challenged. In this paper we also present one of our final study with 12 participants. Based on our findings from our studies we have finally proposed 14 design principles (an extension and redefinition of a previously proposed 10 simple design principles) which should be generally respected in design and development of every \"usable/accessible\" application for the mentally challenged. Some of these principles are applicable as design patterns or models in software development and some were already implemented in our framework which we used to develop new more usable

Characteristics of Products Made of 17-4PH Steel by means of 3D Printing Method

Abstract: The article presents the results of tests of 17-4PH steel fabricated by means of the method consisting in laser additive manufacturing (LAM) – direct metal laser sintering (DMLS). This grade of steel is characterized by excellent stress corrosion resistance in the first place and is applied as construction material in chemical, aircraft, medical or mould making industry. 3D metal printing is a relatively new method enabling significant change of structural properties of these materials at printing parameters predetermined by printers manufacturer for ”offline” printing mode. In order to achieve this goal, the authors have carried out the analysis of chemical composition, SEM tests and the tests of products surface roughness. Furthermore the products have been subjected to X-ray analysis by means of computed tomography (X-ray CT). Structural discontinuities have been found in upper layer and inside printouts subjected to tests.

An Analysis of the use of the Python Language in Robot Applications

Abstract: The paper has analyzed the possibility of using the Python computer language in programming mobile robots. The designed and constructed test stand – a caterpillar mobile robot, enables the testing of wireless control algorithms, responses to events, I/O device programming methods and path selection algorithms. The software applications(client and server) written in the Python computer language have been developed and analyzed. A partial listing of the program source is included. The useful-ness of Python in robot applications was confirmed.

Computer Aided Design and Structural Analysis of the Endoprosthesis of the Knee Joint

Abstract: The paper presents results of the preliminary structural analysis of model of the endoprosthesis of the knee joint. Basics of anatomy and biomechanics of the knee joint were introduced. Based on data from computed tomography, the model of knee joint was constructed. The prototype of the endoprosthesis of the knee joint was designed. After determining physical properties of structural materials, the Finite Elements Analysis of the model was conducted under various load conditions. Finally the results of analysis are presented.

Comparison of pareto efficiency and weighted objectives method to solve the multi-criteria vehicle routing problem using the artificial immune system

Abstract: The solutions to the multi-criteria vehicle routing problem, dependent on route length and travelling time of delivery van, are presented in the paper. This type of problem is known as a traveling salesman problem. The artificial immune system is used to solve it in this article. Since there are two variables – route length and travelling time – two methods are employed. They are: Weighted Objectives Method and Pareto Efficiency Method. The results of calculation are compared.

Data flow in the process of two-dimensional object digitization

Abstract: The article depicts data flow in the process of two-dimensional object digitization. Subject to analysis is RAW to TIFF transformation influence on color reproduction quality: white balansing, demoasicing with noise reduction and sharpening, color space transform, tone reproduction. Color reproduction quality is tested according to FADGI and Metamorfoze guidelines.

Nullifying rules influence on speed in context free grammar LL(1)

Abstract: This research is an investigation of nullifying rules influence on speed of parsing grammar type LL(1). As a prototype, it’s considered a free context language based on LL(1) grammar, containing no nullifying rules (ε-rules). It is shown that recognizer which is based on deterministic push-down automaton (DPDA), in this case parses terms of the language in a minimum number of steps equal to length of the analyzed chain of tokens. It was demonstrated that for terms of another context-free language, which is also described by grammar LL(1) but containing nullifying rules, parsing by push-down automaton needs more cycles. It was shown, a cause of this is presence of nullifying (canceling) rules in LL(1) grammar. After transformations of the original grammar for exclusion these rules from the grammar, parsing speed increased almost to level of the prototype. This fact was confirmed by number of reviewed examples.

Numerical Simulation Studies on the Process of Machining of Shafts with Low Rigidity

Abstract: The paper presents a computer program developed for the determination of the basic dynamic characteristics of the process of machining, numerical simulations of the dynamic system of the process of machining, and graphic presentations of the numerical simulations performed. Results of simulations of the runs of time and frequency characteristics of the process of machining with variable machining parameters are presented. High goodness-of-fit of the model with the actual process of turning was achieved.

Prior Image Jpeg-Compression Detection

Abstract: The paper presents two methods of prior JPEG-compression detection. In the first method the histogram of chrominance is analysed. In JPEGcompressed images the histogram contains significantly more local maxima than in uncompressed files. The second method is based on neighbouring pixel Ø value difference. In JPEG-compressed image the distribution of these values is different than the distribution counted on the edges of compression 8x8 blocks. These differences are summed up to create a classifier that allows to assess if the image was compressed.

Studying the Adoption of a Knowledge Management Tool within German and Polish Manufacturing Companies: An Empirical Case Stydy

Abstract: This article elaborates on the influence of motivational factors for workers in a manufacturing company in the context of the use of a knowledge management tool and is based on data obtained from 85 Polish and German Manufacturing Companies from the cross-border cooperation region of Lubuskie/Poland-Brandenburg/Germany. This is followed by a discussion of the results of empirical studies and of the supporting literature.

Computer analysis of electromotoric swivel walker movement

Abstract: The first mechanical construction of swivel walker is from year 1963 and it was aimed for support movement of people with disabilities. This solution was very difficult and it was main reason for purpose of electromotoric module, which facilitates movement and reduce effort of people with disabilities. Therefore further research in this area are still provided. In this paper trajectory of swivel walker with electromotoric modules is described. To analyze the tilt and trajectory structure of the walker SolidWorks software was implemented.

Numerical Analysis of Buckling and Critical Forces in a Closed Section Composite Profile

Abstract: This paper reports the results of a numerical analysis of buckling in a carbon-fibre reinforced plastic (CFRP). The analysis involved determination of the first buckling mode and critical forces for the tested composite. The composite was tested for six different ply orientations. The analysis was performed on a closed section composite column. The objective of the analysis was to determine critical forces affecting the composite profiles with the applied ply orientations and, thus, to determine the laminate ply orientations which can carry the heaviest loads. The numerical modelling and all computations were performed using the Abaqus 6.14 software. In the analysis, we took account of boundary conditions and performed a discretization process in order to obtain correct results.

Modern 3D Technology used for the Evaluation of Motorsports Drivers

Abstract: The article presents selected modern 3D technologies (a motion capture system, forceplates) that can be used to examine the biomechanics of motorsports drivers. The aim of this paper is to prove the following thesis:“modern 3D technologies allow for precise and objective biomechanical analysis of motorsports drivers as a complement to psychomotor tests” based on the preliminary research. Three motorsports drivers participated in this study.

Computer Application System for Operational Efficiency of Diesel Railbuses

Abstract: The article presents a computer algorithm to calculate the estimated operating cost analysis rail bus. This computer application system compares the cost of employment locomotive and wagon, the cost of using locomotives and cost of using rail bus. An intensive growth of passenger railway traffic increased a demand for modern computer systems to management means of transportation. Described computer application operates on the basis of selected operating parameters of rail buses. 1. SUBURBANAND REGIONAL RAIL SERVICES Until recently, regional rail services were operated by electric three-car multiple units, EN57 and EN71, as well as SP42 or SM32 diesel locomotives to haul up to four cars on non-electrified routes. The aforementioned electric or diesel trains were heavy vehicles with high axle loads ranging from 160÷170 kN. These vehicles had numerous shortcomings, including high energy consumption, lack of operational reliability, low acceleration (1.2 m/s), lack of smooth Lublin University of Technology, Nadbystrzycka Street 36, 20-618 Lublin, +48 81 538 45 85, l.wojciechowski@pollub.pl Department of Logistics, Polish Air Force Academy, Dywizjonu 303 Street 35, 08-521 Dęblin, tadeuszc@poczta.onet.pl University of Technologyand Humanities in Radom, Malczewskiego Street 29, 26-600 Radom, +48 361 77 43, j.marciniak@uthrad.pl **** National University of Technology in Lutsk, Lwowska Street 75, 43-018 Ukraine, bogdan_pal@ukr.net