Software & Systems

Articles of journal № 3 at 2012 year.

Order result by: Public date | Title | Authors |

1. Automation design of tools using metal extrusion technology modeling [№3 за 2012 год]
Authors: Агапитова О.Ю., Бывальцев С.В., Zalazinsky A.G.
Visitors: 13555
Present day production systemы involve growing number of chipless shaping processes for low moldable and difficult-to-form metals and alloys. The most promising process to perform works with such materials is hydraulic-mechanical extrusion. Hydraulic-mechanical extrusion process of difficult-to-form metals is studied with automation design system. MATLAB is integrated with solid state modeling package SolidWorks and DEFORM 2D (3D) system. The process modeling was performed; there were calculated basic power consumption features; lasting quality was tested and assembly drawings were produced together with accessories for hydraulic-mechanical extrusion process. Practical application of this software solution was illustrated using model example of extrusion of difficult-to-form aluminum alloy. The model showed how important is the use of active force of friction that reduce extrusion forces.

2. Some peculiarities of ontology building for multiagent system of intrashop planning [№3 за 2012 год]
Author: Andreev M.V.
Visitors: 9874
The article is devoted to practical use of ontology in multiagent system of intrashop planning in the course of solution of problem of resources operational management of the machine enterprise tool shop. It describes the successful experience of development of automated system of resources intelligent distribution of the tool shop in real time, where the graduates, students and postgraduates of the department of information systems and technologies of Samara State Aerospace University took an active part under the technical supervision of the author in the period of 2010–2012. The concepts Problem and Resource are proposed as the main concepts of the production shop schedule ontology. In order to describe the complicated structure of the problems it is proposed to introduce the relevant ontological ratios «being a subproblem», «to precede» and «to strictly precede», which expand the classical description of technological processes used in the problems of production planning. Formalization of description of problems and resources planning peculiarities is introduced by means of ontological properties, which can be described in the form of tag clouds. Determination of consistency between problems and resources by means of juxtaposition of ontological properties allows the resource selection to be automated while planning technological operations in terms of problems of strategic and operating planning of the enterprise production department (shop) activity. The algorithm described in the article allows implementation of ranking of problem resource-wise allocation variants with regard to individual properties of separate instances and practical usage of ontological description tool box. The obtained results should be recommended to the designers of production planning intelligent systems, and, particularly, multiagent systems and technologies of production resource distribution.

3. Program system for visual languages analysis [№3 за 2012 год]
Authors: Шаров О.Г., Афанасьев А.Н., Гайнулин Р.Ф.
Visitors: 6633
The article describes client-server architecture for analysis of consistency of graphic works in the design process of complex automated systems. The system is represented by multilayer structure. Presentation layer is a tool fo creation of diagrams in a visual language (UML, IDEF, eEPC etc) included in design technique software package (RUP, ARIS etc), or any other editor, which can be expanded with plug-ins. Logic layer is designed for data exchange with plug-in. Description of diagram is transferred during sending procedure in XML format. When error list is received in XML format. The server is accessed through public API-interface. Data processing layer contains multipurpose visual language analyzer of the project works, this analyzer operates on the basis of graphic finite state, which discover and eliminate errors within one pass of diagram analysis. Syntax and semantic errors are controlled in analyzed graphic specifications of the work flow. Analyzer has advantage in the form of linear analysis time, full control and visual error presentation. The article shows grammar example of UML-diagram analysis. The system is implemented in Python environment at Tornado server. The work was made in Computing Technics Department, Ulyanovsk State Technical University.

4. Architecture of advanced high performance microchips [№3 за 2012 год]
Author: Bobkov S.G.
Visitors: 9107
This article reviews new approaches related to high reliable high performance processors provided for super computers of exaflops range. The article shows basic problems that are encountered in the process of improving computing systems performance, it describes trends in the area of microprocessor performance increase. It is difficult to provide synchronization when the chip size is larger than several millimeters. High consumption rate of synchronization pulse tree in modern high performance 45 nm chips results into use of self- clocked logic together with clocked logic. This work provides pattern of hybrid standard core-based processor, which are implemented based on clocked logic, and coprocessors implemented in the form of thread machine with self- clocked logic.

5. Resource distribution in information system related to educational process remote support [№3 за 2012 год]
Authors: Bolodurina I.P., D.I. Parfenov, Reshetnikov V.N.
Visitors: 8547
Development of computer technologies gives rise to the active use of training systems and satellite information technologies in distance education systems. The objective of investigation of effective performance management techniques and optimization of software and hardware usage becomes really relevant. The study is targeted to optimization of resource distribution among vulnerable external (relatively to the system) users in relation to latency and query processing speed. This is connected to availability of internet oriented architecture of the client applications. When the number of queries grows too fast, information systems suffer from lack of consumed resources, there-fore, it is important to manage received queries and minimize failures during the service, which occur depending on allocated resources required for the system operation. Large amount of simultaneous queries leads to disbalance of the operation traffic, negatively affecting routing equipment buffers and results into excessive growth of critical servers’ resources. This study provides construction of multilevel model of the distant education model, it reviews characteristics and provides algorithm for effective use of available resources that can improve service quality in distributed information distant educational systems. Effectiveness of the selection algorithm and service prioritizing of incoming queries is supported by comparative analysis of the output model data, it helps to reduce system time response. In addition, this algorithm can maximize number of processed users’ queries during time unit.

6. About a method of knowledge representation [№3 за 2012 год]
Author: G.B. Bronfeld
Visitors: 11482
In the article there is considered a new method for knowledge modeling in the form of molingas by creating knowledge bases of intelligence systems. In this approach simple sentences are represented as short semantic network by an expert-editor in manual or semi-automatic way that has long been applied when creating expert systems. The original grammatical structure is retained. Complex sentences are divided in simple ones. The received model of sentence is named molinga. The study gives its formal description. Molingas include many ID numbers, core, molinga core usability condition, code sequence of dictionaries numbers, confidence level, postconditions. There is given a kind of semantic network which can represent the core of molinga. Knowledge base consists of a set of molingas. The article describes a step-by-step procedure for obtaining molingas as text models. Simple sentences that have semantic meaning of already entered molingas, do not enter again in the knowledge base. The passage of real text demonstrates the knowledge base example created as a set of molingas, the glossary of terms is given, which is then used with this knowledge base by inferencing. The text has a link to the author's new patent on this knowledge modeling technology. This way of knowledge modeling from texts enables technology of direct knowledge overlay. Similar approach has been used by D. Grey by creation of purely numerical databases. This approach can be used to de-velop intelligence systems for a wide range of knowledge.

7. Peculiarities of working with documents in information management systems [№3 за 2012 год]
Authors: Вичугова А.А., Вичугов В.Н., Дмитриева Е.А.
Visitors: 12011
The article describes aspects of document management in modern multiplayer communication systems that allow you to automate structured electronic information storage and management. Models of these information systems are considered. Analysis of the notion of «electronic document» is performed, including metadata and inner content, as well as the major differences between product data management systems (PDM) and electronic document management systems (ECM) concerning objects of «document» type. Possible states of a document's life cycle in the information system are listed. There are considered features of Workflow management methodology on the example of work with documents. There is a fragment from the developed model of project information management system as an example of the technological data management in instrument manufacture. There are compared document management features on the example of PDM-system Enovia SmarTeam of IBM and Dassault Systems production and domestic ECM-system DIRECTUM, developed by a homonymous Russian company.

8. Templet – method of process oriented simulation of parallelism [№3 за 2012 год]
Author: Востокин С.В.
Visitors: 13673
This paper presents a new methodology of simulation of parallel processes TEMPLET being developed by the author at the department of information systems and technologies of Samara State Aerospace University. It reviews the improved version of notation, which makes it possible: to describe interprocess communication protocols in the form of sequence of communicated messages; to represent the logic of process operation by means of message processing procedures; to visualize the processes and their communication by means of annotated graphs. Simulation method is designed to describe the systems with inherent parallelism on the basis of a process approach. The following aspects of methodology are focused on: the way of process decomposition into message processing procedures; description of process communication protocols in the form of finite-state machines; graphic notation for visualization of process model; detailed description of rules for transmission of model dynamics. An example of the simplest system of fork-join type processes is given to illustrate this. The article consists of five parts. The Introduction considers the purposes of design. The main part shows the upper level diagram describing the process composition and pictographic elements used in it. Then the analysis of examples for the objects comprising the process composition diagram is represented. Further the communication object diagrams are reviewed – channels, diagrams of message processing objects - processes. The representation finishes with a brief description of the support software for TEMPLET simulation methodology and a reference to sources with examples of its usage. Besides, the reference to the web site of the research project related to this methodology is proposed, where you can find its support software.

9. Application of parallel programming package Graphplus templet in modeling [№3 за 2012 год]
Authors: Востокин С.В., Литвинов В.Г., Хайрутдинов А.Р.
Visitors: 9661
Software implementation of parallel programming tools Graphplus templet is represented, which automates the development of parallel programs for multiprocessor work stations and supercomputers. This development has been carried out at the department of information systems and technologies of Samara State Aerospace University within the research project «Graph Plus» (graphplus.ssau.ru). The article develops the approach, which makes it possible to expand and simplify the use of high performance computing hardware in numerical simulations. The key concepts of this approach are the following: application of generic solutions (patterns) of parallel programming; automatic parallelizing and deployment of code on different software and harware architectures; allocation of roles of system programmer – application programmer; usage of integrated development environments and code visualization techniques. The approach is based on the authorial methodology of parallel processes design – TEMPLET-methodology. The structure of the new version of software complex of parallel programming automation Graphplus templet is described. The detailed review of functioning principle of a program graphic model translator, input and output data of the translator, its integration with MS Visual Studio environment is given. The usage of software complex for solution of problems of non linear dynamics and computer optics is shown. Efficiency factors for the programs generated in it in the course of executing on multiprocessor work stations run under MS Windows and on the supercomputer «Sergei Korolev» of Samara State Aerospace University operating under Linux are provided.

10. Playback of heterogeneous videos on 3d object’s edges in visualization subsystem of training simulation system [№3 за 2012 год]
Author: Giatsintov A.M.
Visitors: 9230
This article describes a new method of playing heterogeneous videos on edges of objects in virtual 3d scene. Architecture of video files decoder is presented, algorithms for syncing audio and video data are depicted, as well as methods of uploading decoded video frames to the videocard memory. Limitations and issues of video playback in virtual scene are analyzed. Training Simulation Systems (TSS) should conform to the requirements of personnel training methods and usually contain a large number of informational resources. One type of resources that is used in training is video. Main advantages of using videos in TSS are: ability to visualize different processes and integration of instructor image into the virtual 3d scene. Video playback in virtual 3d scene is a complex task because there are factors to consider that are not relevant when playing video in media player. Visualization subsystem must be able to achieve acceptable framerate (not lesser than 25 frames per second) and react to external actions, such as scene parameters change and loading of additional objects. Developed architecture of video playback subsystem makes it possible to decode and visualize several high definition videos in 3d scene. The developed architecture consists of following components: video decoder that decodes video and audio packets; sound subsystem that plays the decoded sound; control module that is used to play specific video, pause it, set its volume and so on; interface that glues the video playback subsystem with visualization subsystem.

| 1 | 2 | 3 | 4 | 5 | 6 | Next → ►