Monthly Archives: November 2015

A Brief Survey of Segmentation Techniques Applied in Kidney Ultrasound Images

Stephan Vassilev

Abstract: The paper briefly explains research, domain and application related to the techniques applied in Kidney Ultrasound images. The first two sections introduce the domain area (ultrasound images and kidney problems related to them), the specific targets and formulate the problem. The rest two sections highlight the technologies and algorithms applied up to now, compare them and provide observations from that comparison. The paper also outlines some of the problems that can occur in different phases of the ultrasound kidney images.

Key words: Kidney, Ultrasound images, medical images, segmentation, models, graph, edge

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MVC Framework Approach in the Online assisted platform for Computer-aided Design in Communications — Online-CADCOM

Ognyan Chikov, Galia Marinova

Abstract: The paper presents the MVC Framework approach, implemented for the development of the platform Online-CADCOM. MVC programming approach is an architectural pattern that separates a web application into three main logical components: the Model, the View and the Controller, thus overcoming issues, rising from the complexity of web-based multitool design platforms. The architecture of the web application Online-CADCOM is described and it’s illustrated by the “View” section from the MVC Framework model.

Key words: Computer-aided design in communications, MVC Framework, Programming Layers, File Separation Content Management System

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Influence of Parameters of the Satellite Radio Channel on the Reception Quality of TV Signals

Lyubomir Laskov, Lidia Jordanova, Veska Georgieva

Abstract: In this paper an algorithm for design of the radio channel for satellite TV systems of first and second generation is presented. The algorithm allows taking into account the parameters of the repeater, satellite radio line and receiver, as well as the methods used for channel coding and modulation. The results of the research on the impact of ERP, the channel bandwidth, intensity of the rainfall, the size of the receiving antenna, noise ratio of LNC, earth position of the receiving antenna and others on the carrier to noise ratio on the receiver input are presented.

Key words: CNR, DVB-S, DVB-S2, E1RP, Satellite Channel

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Insights into 5G Technology: Some Data TransmissionAspects

ZlatkaValkova-Jarvis, Viktor Stoynov

Abstract.5G networks are the next-generation of telecommunications services and are expected to meet users’ growing demands and quality requirements. Intelligent high-speed services call for more spectrumwhich, coupled with the continuously growing number of users,creates the need for a technological leap in their development. The concept of using the millimeter waveband for telecommunication needs inevitably results in the introduction of new technological solutions that are in harmony with the Gbits/sec data-rate transmission. This publication presents some of the main data transmission aspects of upcoming 5G telecommunications networks, the reasons for their development and the scientific issues arising.

Key words:MassiveMultiple-Input Multiple-Output (M-M1M0),Orthogonal Frequency Division Multiplexing (OFDM) technology, Full-Duplex, Millimeter wave (mmW) spectrum, 5G networks

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Search in Knowledge Base Represented with Semantic Graphs

Ventzislav Nikolov, StefanPanov

Abstract: This article presents methods for searching in semantic graphs / S-graphs/ used for formal representation of subject areas. Shown are opportunities to update the facts and relations in the semantics of the subject area with an emphasis on the requirement to preserve consistency, completeness of data and relations between them.

Keywords: Semantic networks, Classes and objects, Relation.

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Semantic Graphs for Knowledge Representation

Ventzislav Nikolov, Stefan Panov, Dimitar Pilev

Abstract: .The subject of this article is the formal presentation of knowledge in any subject area by using semantic networks and generalized relations that define its semantics. Introduced and used are notions for basic and dependent classes as well as basic and dependent objects as instances of the respective classes. A method for building a semantic network with specific instances of the defined classes on the basis of the presented semantics is discussed.

Keywords: Semantic networks, Classes and objects, Relation

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Software Supporting of Dental Labors

Ventzislav Nikolov, Stefan Panov, Dimitar Pilev

Abstract: The focus in this article is a software system for supporting activities in a dental clinic. Discussed are the objects in the subject area as well as their structure is exposed in view of the formal representation of the processes in the clinic. Described is the distribution of roles between the staff at the clinic besides functional relationships between them are defined.

Keywords: Database,ER-model, SQL-Server, dental clinic.

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Heterogeneous Biological Data Integration

Hristo Stoev

Abstract: Major challenge in the analysis of biological data is to propose an integrated and modern access to the progressively increasing amounts of data in multiple formats, and efficient algorithms for their processing. The paper examined the models for extraction and integration of large amount of biological data, as well as problems related to heterogeneity, distribution and compatibility of data. A conceptual architecture for integrating of distributed biological data based on service-oriented architecture is proposed.

Key words: biological database, data integration, heterogeneous, service oriented architecture.

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Interactive Visualization — Problems and Approaches

Ani Dimitrova

Abstract: The visualization of large datasets at interactive rates has been a great challenge for decades. As a result a lot of approaches have been used and a lot of techniques have been developed. The presented article tries to summarize the main approaches. First, a definition of the term “large data” is given and the need of out-of-core techniques is explained. Then, the approach known as Spatialization is discussed. The article focuses on the meaning and the types of the so called Level Of Details (LODs) as well as on the caching and prefetching using the real interactive visualization system, called iWalk for illustrations. In the end some additional techniques for graphics pipeline optimization are mentioned.
Key words: large dataset, out-of-core visualization, spatial data structures, model simplification, level of detail, cashing and prefetching.

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Architecture Optimized for Enterprise Data Warehouse for Order Management and their Transactions

Ivan Stankov

Abstract: Proposed a new conceptual model and architecture for enterprise data warehouse for management of orders and their transactions. A comparison is made between summary data mart bus architecture with linked dimensional data marts and proposed an optimized architecture. Graphical representation of results.

Key words: Enterprise Data Warehouse for order management and their transactions. Optimizing an architecture.

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