Software & Systems

Articles of journal № 1 at 2015 year.

Order result by: Public date | Title | Authors |

21. Constructing a corpus for sentiment classification training [№1 за 2015 год]
Author: Rubtsova Yu.V.
Visitors: 18387
The paper presents a tool for short texts corpus collecting and analyzing. The first module of the tool is a text collector (parser). The second module is a corpora processingwhich consists of two stages: corpus morphological tagging – in order to identify characteristic features of each o f the three classes of short texts; constructing a vocabulary of emotional unigram and bigrams based on the corpus. The statistical weight of each unigram and bigram was calculated depending on positive or negative class of text. Developed vocabulary does not belong to any predefined object domain. Thus, this paper presents a tool for collecting corpus. Also a corpus of modern Russian language short texts was constructed using the developed tool. It is available for public inspection. The corpus is intended to train a sentiment classifier that sorts general-topic texts into two and three classes: “positive” and “negative”; “positive”, “negative” and “neutral”. In addition, the corpus was a base for creating an emotional vocabulary. A statistical weight of the word meaning for positive or negative texts class was calculated for each term or phrase in the dictionary. The results are used to build and train a sentiment classifier.

22. Modeling of soft tissue virtual dummy for designing corsetry and lingerie [№1 за 2015 год]
Authors: Senitsky I.A., Vasilev D.A., Gorelova A.E., Kornilova N.L.
Visitors: 9467
The article discusses the theoretical basis of dummies formation for three-dimensional CAD models to design corsetry and lingerie. The distinctive feature of this clothing design is a necessity of modeling soft tissues behavior ofdifferent types of shapes, naked and under the influence of the product. The authors propose an algorithmically independent structure of soft tissues (breast, abdomen, buttocks) andthe torso of the dummy. Dummy virtual model is a torso and imposed on it simulation models of breasts, buttocks and abdomen. When creating a model of the torso the main task is to ensure model rebuilding for any size and growth while preserving the original shape. This article describes the author's method of creating a simulation model of the soft tissues of the dummy using geometrical and physical modelling. The method allows creating different forms of the breast, abdomen and buttocks by varying the parameters of the simulation model. The theoretical results are implemented in the softwaremodule “A virtual mannequin” for three-dimensional CAD to design BustCAD corsetry (Ivanovo, Russia). This CAD software allows the user to create a virtual mannequin to evaluateits aesthetic charac-teristics, to set the parameter changes of the torso and soft tissue based on modeling effects of the product, to create a model and to get detailed patterns.

23. The layout of advanced simulators training facilities of ship radiocommunicatoins [№1 за 2015 год]
Authors: Sergeev V.V., Rodionov A.V., Puchko E.V.
Visitors: 9722
One of the most important problems of training quality improvement of ship operators is develop-ment of modern educational and training means. To train specialists along with using small-sized single task simulators, the Military Institute of Continuing Professional Edication of the VUNTS Navy “Naval Academy” also used radio communication simulators “Globus”, “Poseidon”, “Molniya”, TGS-4000 and “Marsim-C” and a complex simulator of ship operators “Plemya-S”. The article considers the opportunities and shortcomings revealed in the “Plemya-S” simulator life cycle. They are peculiar to other coherent simulators. The paper shows the absence of possibility of automatic control and adaptive reactions to actions of trainees in radio communication simulators at the tactical and special level. In this regard essential loading is assigned to the headof training who imitates work of the operators of a coastal commands and communication centers. The work increases in proportion to increasing of trainees in ed-ucational groups. The analysis of the “Plemya-S” simulator allowed us to offer ways to improve simulators of ship operators at the special, tactical and special and tactical levels and also admissible restrictions. The key part in the perspective exercise machine has to be assigned to development of complex radio exchange model of the Navy mobile objects with coastal commands and communication centers. It will allow solving system problems: didactic, research and practical.

24. Software for representation and transformation of discrete knowledge structures [№1 за 2015 год]
Author: Subbotin S.A.
Visitors: 12751
The article shows developed software that allows representing different knowledge models in a common language. It also contains the procedures automating the conversion between different expert knowledge. The developed program has a modular structure and contains subsystems for different knowledge representation models. The semantic network modeling subsystem contains functions for creation of the semantic network structure, adding nodes and links, deletion nodes and links, for graphic display of a semantic network with a circular, random and hierarchical arrangements of nodes, as well as a function for searching a subnetwork-request in the knowledge base network. The frame network modeling subsystem contains functions for creating frame model structure, frame creating, adding frames as nodes in the network, removing frames from the network nodes, adding and removing links between frames, graphical displaying of hierarchical frame model, and searching frames. The production model modeling subsystem contains a set of functions for knowledge creation, modifying and processing based on production models. They are: creating a model structure, adding the variable and question, adding a rule, graphical displaying of rule network, searching the basis of production model using different strategies of rule conflict resolution. The subsystem of transformation and analysis of knowledge representation structures provides a mutual conversion of knowledge from semantic networks, frame and production models.

25. An approach to SADT (IDEF0) difficulty evaluation [№1 за 2015 год]
Authors: Uskov A.A., Zhukova A.G.
Visitors: 9989
SADT (Structured Analysis and Design Technique) methodology and its component IDEF0 is widely used for modeling business processes, software systems, as well as technology and production processes. There is a wide range of CASE-tools to implement SADT methodology. SADT-model construction starts with the presentation of a system as a single unit and arcs representing system interfaces with the environment. It is a so called contextual diagram. Then, this block is decomposed into several blocksjoined by arcs interface. These blocks are the original function subfunctions. Each of the sub-functions if necessary can be decomposed further in a similar manner to achieve the desired granularity. The paper offers a new approach to estimating the complexity of SADT models perception based on functioning features of short-term human memory and transferring data process from short-term memory into long-term. The article considers a model perception factor and a formula to calculate it which allows comparing and optimizing SADT models for a given parameter. The paper contains a perception factor analysis for a homogeneous SADT model (a model with the same number of blocks in all the diagrams). It confirms the known empirical principle: the number of diagram blocks should be in the range 3-6. An analysis of heterogeneous 2-level SADT model has shown that to reduce a perception factor, it is necessary to choose a decomposition strategy so that the number of blocks on the charts decreased when a decomposition level increases. The authors propose to use adaptable fuzzy systems for increasing the accuracy of estimating SADT models perception difficulty. Thus, a theoretical estimate of perception factor should be used as a priori information and experimental data as a training set.

26. Counting people in a video sequence based on head detection [№1 за 2015 год]
Authors: Philippov I.V., Kononov V.A., Konushin V.S., Konushin A.S.
Visitors: 14651
The paper considers the problem of counting people in selected regions for each frame of a video sequence. Nowadays there are no methods that estimate the number of people with high accuracy and which are compatible with differ-ent scenes without changing any parameters or training on a portion of new video sequence. This paper gives a survey of existing methods and presents a new algorithm which extends previously proposed method based on head detection. For head detection the authors use an algorithm based on weak cascade set with boosting. This algo-rithm uses sums of intensity, color, gradient magnitude, gradient filters responses values in rectangular areas as image fea-tures. Detector parameters are selected in order to maximize the detector recall. So that almost all human heads could be detect-ed in video sequence. Due to small resolution of human head in video sequences this leads to large number of false positives. The authors propose a multi-stage filtering procedure whichuses such criteria as detection size, human height, correspond-ence between detection and extracted foreground, temporal stability. Experimental evaluation on open ground truth dataset has demonstrated that the proposed algorithm outperforms previous algorithms based on head detection and shows consistent performance on different sequences without specific tuning.

27. Program complex for calculation and research of the inaccuracy of turning nonrigid blanks [№1 за 2015 год]
Authors: Shelikhov E.S., Serdyuk A.I., Chernousova A.M.
Visitors: 7255
The authors consider the problem of inaccuracy definitionarising when turning blanks with the length great-ly exceeding their diameter on CNC machines (computer numerical control). The authors have analysed mathematical models for definition of inaccuracies in the course of turning. The result showed that for the considered details the defining factor when forming inaccuracies is rigidity of MTTD (Machine-Tool-Tools-Detail) system. The paper also markes restrictions in the existing methods of research and practice of defyingdevia-tions taking into account constant and dynamic components of system elements flexibility. In particular, in terms of practi-cal significance, there are difficulties with accounting of elastic deformations caused by functional interrelations of cutting conditions with blanks parameters which are set by strength properties of the used material in the considered range of geo-metrical ratios. To increase the accuracy of processing, the authors offer a technique for determining optimum cutting pa-rameters. OptimRez software package allows the user to define cuttingmodes to minimize the considered inaccuracy taking into account the applied turning equipment capability and characteristics of processed blanks. Software package includes five in-terconnected modules, uses databases containing tools, machine tools and different workpieces. OptimRez can be used in process engineering, in research projects and educational process.

◄ ← Preview | 1 | 2 | 3