DOI: 10.7256/2454-0714.2014.4.13738

Abstract:

DOI: 10.7256/2454-0714.2014.4.65858

Abstract: the article reviews a model of supplies accounting based on the FIFO technology. The mentioned technology allows consequent write-off (or consumption) of raw materials for the production, starting with the earliest deliveries while recording the price of each consumed shipment. The descried technology is in demand while accounting goods, as it enables determining the availability, price and quantity of product on stock. That helps, for example, to recalculate real product cost at any time. The implementation of the system is formed of database and client-side components, which carry out registration of supply and consumption of goods. The feature and novelty of the proposed approach is in redundancy in the logical data model that creates a more transparent mechanism for registering deliveries. The mentioned above implementation can be considered as a general scheme for write-offs of raw materials technology using FIFO principle in automated information system on any software platform.

Keywords: FIFO, information system, software, automation, cancellation of raw materials, software implementation, flow of goods, logical model, database, client-server application

DOI: 10.7256/2454-0714.2014.4.13971

Abstract:

DOI: 10.7256/2454-0714.2014.4.65859

Abstract: the article presents a functional model (diagram) of the process of designing technological devices. The diagram includes steps of structural and parametrical synthesis of the device and its elements. Based on the functional design model the procedural model is created. It’s meant for converting the information flow defined by the terms of reference into the information flow for the working draft. Terms of reference defines a set of device functions, conditions of its interactions with user, workspace and environment. Working draft includes sketches, specifications, calculations and other documents. Functional diagram is created using IDEFO technology. Procedural model is represented by a set of formal statements, ways of converting input information flows in the output information flows. Procedural model of designing technological devices is characterized by the use of the following models: information and logical model of the designed equipment, model of processes taking place in the device, model of manufacturing technology of the technological equipment. The developed functional and procedural models can be used as a base for creating intelligent automated systems for generating project documentation with minimum human involvement.

Keywords: technological device, functional design model, procedural model, computeraided design, intelligent systems, mathematical provision, information model, hypergraph, product structure, working draft

DOI: 10.7256/2454-0714.2014.4.13974

Abstract:

DOI: 10.7256/2454-0714.2014.4.65860

Abstract: the article is devoted to design a database for an Android application for calculating the cubic capacity of roundwood. The authors analyze advantages and disadvantages of different ways of storing data and chose the best way taking into account the predetermined conditions. The authors also developed and presented a structure of the database designed considering specific characteristic of the information being stored: a need to group different records logically related to the same entity, establishing relations between tables. The best way to store data was obtained in comparing different alternatives. While choosing a suitable database structure the authors analyzed input information, highlighted the general properties of the data under consideration and grouped it input tables. The novelty of the research lies in the uniqueness of the research subject. As a result of the study a database for an Android application for calculating the cubic capacity of roundwood was designed. The database structure is designed considering all characteristics of stored data, as well as the hardware capabilities of the platform. The developed module is included in the application, and it made a favorable impression.

Keywords: DBMS, database structure, OS Android, mobile devices, SQLite, binary data, blobs, image storing, roundwood cubic capacity, reports generation

DOI: 10.7256/2454-0714.2014.4.13995

Abstract:

DOI: 10.7256/2454-0714.2014.4.65861

Abstract: The subject of the study is the technology of improving operational reliability of aircraft state aviation. The object of the study is a computer-aided tool for controling the technical condition of the aircraft. The authors substantiate the importance of practice for optimizing the requirements for means of ensuring the maintenance and repair of aircraft, for their continuous and complete information support. The article shows possibilities of providing more efficient use of information gathered by the system of operational control of the aircraft, in the interest of the control of their condition and to ensure its speedy recovery. The paper presents an expediency of supplementing the operational control of aircraft by specialized information-diagnostic built-in control system of their condition, providing information interaction between the controlled part of the aircraft (which is subject to control) and control devices. The authors describe a system of indicators of the reliability of self-control state of the built-in control system. Methodology of the research is structured systems analysis and domain information and logical modeling of data collection and processing. The article reviews the modern approach to the creation of embedded control systems for aircraft, lists the requirements to them and offers basic mathematical relationships for calculating estimates of indicators characterizing the accuracy of the test results. The novelty of the study is in showing the expansion of the list of priorities used in aviation means for the operational control of aircraft in order to create information systems and diagnostic tools for controlling its technical condition.

Keywords: onboard automated system, information and diagnostic system, informatization of built-in control, diagnostics of technical state, intelligent aircraft equipment, the accuracy of control, in-service inspection, built-in control automation, aircraft condition, fault tolerance of complex systems

DOI: 10.7256/2454-0714.2014.4.14054

Abstract:

DOI: 10.7256/2454-0714.2014.4.65862

Abstract: the article describe a workstation, designed to reduce the time of ergonomic expert evaluations of personal and collective noise protection means by automatic gathering and processing information in the interests of ergonomic expertise of any kinds of means and their combinations. The authors formulate principles of selecting means of noise protection and provide general technology of automated ergonomic expert evaluation of noise protection means, based on the technology mentioned earlier. The research methodology is based on a combination of the results of the structural system analysis, information and logic simulation and design automation of information-measuring systems. As a result of the research a sample automated workplace for ergonomic expert in noise protection was built for the first time. The workplace provides high quality of ergonomic expert evaluations of hearing protection devices while reducing the time of evaluations by providing automated data gathering and automated processing of information for the benefit of ergonomic expertise of any samples of noise protection means in any combinations.

Keywords: ergonomic expert evaluation, automated workplace, information-measuring system, personnel protection means, hearing protection device, systems design, expert system, working conditions monitoring, designing means of protection, hardware-software complex

DOI: 10.7256/2454-0714.2014.4.13768

Abstract:

DOI: 10.7256/2454-0714.2014.4.65863

Abstract: in this paper a complex model based on the theory of fuzzy sets is proposed for the automatic analysis of the results of self- evaluation of quality of management system of the structural unit of the university. The model consists of 11 modules, each module is a fuzzyproduction subsystem. The article shows a graphical representation of the membership functions of the input linguistic variables, a fragment of the base of fuzzy productions rules consisting of 125 rules, a sample of surface of fuzzy inference and a demo of the proposed model. The authors use fuzzy inference algorithm, suggested by E. Mamdani, implemented in FuzzyTECH software environment. The novelty of the presented complex fuzzy-production model is in the use of the theory of fuzzy sets, which have not yet been applied in analysis of the results of self-evaluation of quality of management system of the structural unit of the university. Testing of the model on situational examples proved its adequacy in simulated situations.

Keywords: quality management system, self-evaluation, efficiency evaluation, fuzzy set, fuzzy-production model, linguistic variable, term-set, universal set, fuzzy productions rule, surface of fuzzy inference

DOI: 10.7256/2454-0714.2014.4.13755

Abstract:

DOI: 10.7256/2454-0714.2014.4.65864

Abstract: the subject of this study is the time required to complete a full rebuilding of a binary tree, as well as the degree of compression of text in Huffman algorithm. The author defines dependencies of both time of program execution and the level of text compression from the length of string formed of random set of unique symbols, from the length of string if it consists of fixed set of unique symbols and in the case of the fixed length of string having different number of unique symbols. It is shown that the time required to rebuild a binary tree is a small part of the total time of the program execution. An algorithm for constructing the character codes comprises the following steps: 1) reading the text from file; 2) counting different symbols of the text; 3) filling and sorting the data array; 4) building binary tree. Some sources state that the approach with full rebuilding of a binary tree is ineffective. However, that statement is not supported by relevant facts. The author proves through the analysis of texts of varying length and different sets of unique characters, presented in tabular and graphical form, that the rebuilding of a binary tree has little effect on the program execution time.

Keywords: Huffman algorithm, binary tree rebuilding, compression of text data, program execution time, thrifty information encoding, prefix encoding, unique symbols, the degree of text compression, length of input string, average approximation error

DOI: 10.7256/2454-0714.2014.4.14056

Abstract:

DOI: 10.7256/2454-0714.2014.4.65865

Abstract: the authors in detail review pneumatic pressure regulator, which is has essential value for on-board systems of aircraft oxygen supply in order to build a mathematical model of the regulator. The subject of the study is building a mathematical model of pneumatic pressure regulator considering factors having a significant impact on vital functions and work of the flight crew. This ensured the construction of adequate mathematical models, describing the functioning of pneumomechanical pressure regulator in the cabin of aircrafts, which are essential for safety in high-altitude flights. Mathematical modelling of pressure regulator considering factors having a significant impact on vital functions and work of the flight crew: factors that characterize the atmospheric space as a habitat for the crew; factors related to the dynamics of flight; factors related to various types of emergencies in case of which the flight becomes impossible. The study of the mathematical model built allowed the authors to identify that: dry friction of the main valve significantly impairs the dynamics of the regulator, but has almost no effect on its static error; dry friction of the control valve significantly increases the static error of the controller, but has almost no effect on the dynamics of the regulator; the presence of self-oscillations of small amplitude and high frequency together with the elimination of the dead zone of the controller changes the structure of dry friction, removing the dry static friction etc. The results obtained are essential for the design of aircraft life support systems.

Keywords: life support system, high-altitude flights, aviation cybernetics, pneumatic mechanical regulator, preasure regulator, model of dry friction, model of pneumatic regulator, computational experiment, transition functions, oxygen supply system

DOI: 10.7256/2454-0714.2014.4.13982

Abstract:

DOI: 10.7256/2454-0714.2014.4.65866

Abstract: The author studies geometrical transformation of functionally defined three-dimensional shapes. The paper suggests description of geometrical objects using functions and implementing the methods of transformation of the describing function for geometric operations such as projection, offsetting, set-theoretic and functions of metamorphosis including morphing nonhomeomorphic objects as well as more complex geometric operations: sweeping by moving solid object and twisting of objects. Of all existing methods the functional representation is the most accurate way of describing object geometry, needs less space for storing data required. Functional representation provides compactness and flexibility in setting surfaces and objects obtained as a result of logical operations on volumes. Using functional representation of objects makes it possible to implement new effects on objects due to the introduction of operations on functions. It can be useful in modelling some complex movements of object and particles in scientific applications and games. The method of the research is based on the use of systematic and targeted approach in the evaluation of algorithmic solutions, theory of sets and analytic geometry, interpolation theory and matrix theory, mathematic modeling and theory of computing systems. The main conclusions of the study are: the possibility of implementing complex geometric operations (metamorphosis, projections, offsetting, twisting, sweeping) on objects; proposed method of describing threedimensional scene objects using reference surfaces and functions of the perturbation has a more compact description in comparison with known methods of specifying functionally defined objects; in comparison with known algorithms the rendering algorithm determines the point on the surface of functionally defined objects in less time due to the smaller number of calculations; the proposed functional description of objects simplifies the implementation of the mentioned above operations on geometric functions of the perturbation.

Keywords: geometric objects, geometric operations, perturbation function, quadrics, collision detection, three-dimensional morphing, set-theoretic operations, local deformation, global deformation, visualization

DOI: 10.7256/2454-0714.2014.4.14028

Abstract:

DOI: 10.7256/2454-0714.2014.4.65867

Abstract: the article is devoted to evaluation of possibility and effectiveness of the use of self-configuring genetic algorithm of global optimization to automate the task of determining the atomic crystal structure of new substances by its powder the x-ray diffraction. The suggested version of the self-configuring genetic algorithm was studied on the problem of determining the known crystal structure of a Ba2CrO4 chemical compound, which required finding the location of 7 independent atoms in the elementary cell of the crystal. To analyze the effectiveness and determining the convergence rate of structural models to the true structure of the substance in the process of evolutionary search the authors performed several dozen launches of selfconfiguring genetic algorithm with different population sizes of structural models and types of genetic operations. The essence of the self-configuration method is in the fact that choice of optimal genetic operators of selection, crossbreeding and mutation from the suggested set of possible variants is performed by the self-configuring genetic algorithm itself while solving the problem. The probability for the operators of being selected to generate the next generation of population of structural models adapts based on the success of evolution by using these operators on the previous generation. This leads to the automatic selection of the best operators providing convergence of structural models to the true crystal structure. One of the main problems that prevent the use of stochastic evolution of genetic algorithms for structure analysis is the need for a non-trivial empirical selection of genetic operators. Applying the self-configuring genetic algorithm to automate the selection of optimal genetic operators in the task of modeling atomic crystal structure of chemical compounds by the X-ray diffraction data is suggested for the first time. In determining the crystal structure of Ba2CrO4 using self-configuring genetic algorithm the convergence rate to the true crystal structure reached 80%. This creates the possibility of developing an automated evolutionary genetic algorithm for structural analysis based on the X-ray diffraction data.

Keywords: evolutionary algorithms, genetic algorithms, self-configuration of genetic algorithms, crystal structure, X-ray powder diffraction, full-profile analysis, determination of crystal structure, self-configuration, diffraction pattern, genetic operators