Miroslav Voznak - Academia.edu (original) (raw)
Papers by Miroslav Voznak
This paper explains the VoIP network design for good voice quality on low speed links and describ... more This paper explains the VoIP network design for good voice quality on low speed links and describes the quality measurement results. Many of issues, such as compression of the speech frame and delay variation, are inherent to VoIP. With careful planning and solid network design these effects on VoIP networks can be minimized.
Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security, Defense, and Law Enforcement XIV, 2015
International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2014), 2014
ABSTRACT This paper proposes a QoE (Quality of Experience) assessment model which can estimate vo... more ABSTRACT This paper proposes a QoE (Quality of Experience) assessment model which can estimate voice and video quality. Based on the proposed model, speech or video quality is calculated with regard to policies applied for packet processing by routers and to the level of total network utilization. The contribution of this paper lies in designing a new computational model capable of predicting the quality of multimedia services respecting queuing policy and transmission speed of interfaces on routers in IP networks.
Advances in Intelligent Systems and Computing, 2014
Advances in Intelligent Systems and Computing, 2014
Advances in Electrical and Electronic Engineering, 2013
Advances in Electrical and Electronic Engineering, 2012
Advances in Electrical and Electronic Engineering, 2011
Advances in Electrical and Electronic Engineering, 2014
Advances in Intelligent Systems and Computing, 2014
2012 Next Generation Networks and Services (NGNS), 2012
ABSTRACT The paper deals with performance measurement and assessment of SIP based network. The co... more ABSTRACT The paper deals with performance measurement and assessment of SIP based network. The complex methodology for SIP benchmarking and performance testing based on IETF draft versions has been developed by our team so that the results coming from the measurement specified in this methodology could be compared platform independently. Our earliest implementations of this methodology relied on open-source software and virtualization tools and were greatly improved during the last year with the emphasis on ease of use, understandability and repeatability. The development of this platform and its current stage are the topic of this paper which presents both the cornerstone technologies of the new platform and the main aspects of the methodology in relation to the result analysis.
Advances in Electrical and Electronic Engineering, 2012
ABSTRACT This article deals with both theoretical and practical application of Extensible Messagi... more ABSTRACT This article deals with both theoretical and practical application of Extensible Messaging and Presence Protocol instead of different solution described detailed in the article. It uses periodically HTTP method POST to gain information about a state, which a client stands in. During this process a new connection is created and closed, what enormously makes network traffic mote intensive. Instead of this we used XMPP, this technology eliminates disadvantages of synchronous HTTP connection by its adapting for real time connection. It uses stable connection, what does not need to create it any time any information needs to be sent. It decreased amount of transported data through a network and a time, in which is a client informed about an event due to a fact, that the new solution works in real time. © 2012 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING.
Advances in Electrical and Electronic Engineering, 2011
2014 22nd Telecommunications Forum Telfor (TELFOR), 2014
2014 22nd Telecommunications Forum Telfor (TELFOR), 2014
2014 22nd Telecommunications Forum Telfor (TELFOR), 2014
Advances in Intelligent Systems and Computing, 2014
ABSTRACT Emotional state classification of human speech and recognition accuracy of the classifie... more ABSTRACT Emotional state classification of human speech and recognition accuracy of the classifiers is disclosed in this paper. Recent developments in speech recognition places more emphasis on the extraction of information about the speech source. This means obtain information about who and how it was said. This article describes research which seeks to recognize the information from speaking, emotional state in particular. Emotional state is recognized by using different classifiers and features of speech by nowadays known systems. Berlin database of emotional recordings was used to train and test the system. Mel-frequency spectral coefficients and dynamic coefficients were extracted from the audio signal of the database. For classification were used Gaussian Mixture Model, k-Nearest Neighbours and Artificial Neural Networks methods. The main effort of this research is to examine the accuracy and usability of classifying methods for detection of human stress status from his speech.
Wireless Sensing, Localization, and Processing IX, 2014
ABSTRACT New applications in wireless environments are increasing and keeping even more interests... more ABSTRACT New applications in wireless environments are increasing and keeping even more interests from the developer companies and researchers. In particular, in these last few years the government and institutional organization for road safety spent a lot of resources and money to promote Vehicular Ad-Hoc Network (VANET) technology, also car manufactures are giving a lot of contributions on this field as well. In our paper, we propose an innovative system to increase road safety, matching the requests of the market allowing a cooperation between on-board devices. The vehicles are equipped with On Board Unit (OBU) and On Board Radar Unit (OBRU), which can spread alerting messages around the network regarding warning and dangerous situations exploiting IEEE802.llp standard. Vehicles move along roads observing the environment, traffic and road conditions, and vehicles parameters as well. These information can be elaborated and shared between neighbors, Road Side Unit (RSU)s and, of course, with Internet, allowing inter-system communications exploiting an Road Traffic Manager (RTM). Radar systems task it the detection of the environment in order to increase the knowledge of current conditions of the roads, for example it is important to identify obstacles, road accidents, dangerous situations and so on. Once detected exploiting onboard devices, such as Global Position System (GPS) receiver it is possible to know the exact location of the caught event and after a data elaboration the information is spread along the network. Once the drivers are advised, they can make some precautionary actions such as reduction of traveling speed or modification of current road path. In this work the routing algorithms, which have the main goal to rapidly disseminate information, are also been investigated.
Wireless Sensing, Localization, and Processing IX, 2014
ABSTRACT Many recent research efforts have confirmed that, given the natural evolution of telecom... more ABSTRACT Many recent research efforts have confirmed that, given the natural evolution of telecommunication systems, they can be approached by a new modeling technique, not based yet on traditional approach of graphs theory. The branch of complex networking, although young, is able to introduce a new and strong way of networks modeling, nevertheless they are social, telecommunication or friendship networks. In this paper we propose a new modeling technique applied to Wireless Sensor Networks (WSNs). The modeling has the purpose of ensuring an improvement of the distributed communication, quantifying it in terms of clustering coefficient and average diameter of the entire network. The main idea consists in the introduction of hybrid Data Mules, able to enhance the whole connectivity of the entire network. The distribution degree of individual nodes in the network will follow a logarithmic trend, meaning that the most of the nodes are not necessarily adjacent but, for each pair of them, there exists a relatively short path that connects them. The effectiveness of the proposed idea has been validated thorough a deep campaign of simulations, proving also the power of complex and small-world networks
This paper explains many of the issues facing Voice over IP (VoIP). Many of these issues, such as... more This paper explains many of the issues facing Voice over IP (VoIP). Many of these issues, such as compression/decompression of the speech frame and propagation delay, are inherent to VoIP. With careful planning and solid network design these effects on VoIP networks can be minimized. This paper details these various issues and explains how they can affect packet networks.
This paper explains the VoIP network design for good voice quality on low speed links and describ... more This paper explains the VoIP network design for good voice quality on low speed links and describes the quality measurement results. Many of issues, such as compression of the speech frame and delay variation, are inherent to VoIP. With careful planning and solid network design these effects on VoIP networks can be minimized.
Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security, Defense, and Law Enforcement XIV, 2015
International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS 2014), 2014
ABSTRACT This paper proposes a QoE (Quality of Experience) assessment model which can estimate vo... more ABSTRACT This paper proposes a QoE (Quality of Experience) assessment model which can estimate voice and video quality. Based on the proposed model, speech or video quality is calculated with regard to policies applied for packet processing by routers and to the level of total network utilization. The contribution of this paper lies in designing a new computational model capable of predicting the quality of multimedia services respecting queuing policy and transmission speed of interfaces on routers in IP networks.
Advances in Intelligent Systems and Computing, 2014
Advances in Intelligent Systems and Computing, 2014
Advances in Electrical and Electronic Engineering, 2013
Advances in Electrical and Electronic Engineering, 2012
Advances in Electrical and Electronic Engineering, 2011
Advances in Electrical and Electronic Engineering, 2014
Advances in Intelligent Systems and Computing, 2014
2012 Next Generation Networks and Services (NGNS), 2012
ABSTRACT The paper deals with performance measurement and assessment of SIP based network. The co... more ABSTRACT The paper deals with performance measurement and assessment of SIP based network. The complex methodology for SIP benchmarking and performance testing based on IETF draft versions has been developed by our team so that the results coming from the measurement specified in this methodology could be compared platform independently. Our earliest implementations of this methodology relied on open-source software and virtualization tools and were greatly improved during the last year with the emphasis on ease of use, understandability and repeatability. The development of this platform and its current stage are the topic of this paper which presents both the cornerstone technologies of the new platform and the main aspects of the methodology in relation to the result analysis.
Advances in Electrical and Electronic Engineering, 2012
ABSTRACT This article deals with both theoretical and practical application of Extensible Messagi... more ABSTRACT This article deals with both theoretical and practical application of Extensible Messaging and Presence Protocol instead of different solution described detailed in the article. It uses periodically HTTP method POST to gain information about a state, which a client stands in. During this process a new connection is created and closed, what enormously makes network traffic mote intensive. Instead of this we used XMPP, this technology eliminates disadvantages of synchronous HTTP connection by its adapting for real time connection. It uses stable connection, what does not need to create it any time any information needs to be sent. It decreased amount of transported data through a network and a time, in which is a client informed about an event due to a fact, that the new solution works in real time. © 2012 ADVANCES IN ELECTRICAL AND ELECTRONIC ENGINEERING.
Advances in Electrical and Electronic Engineering, 2011
2014 22nd Telecommunications Forum Telfor (TELFOR), 2014
2014 22nd Telecommunications Forum Telfor (TELFOR), 2014
2014 22nd Telecommunications Forum Telfor (TELFOR), 2014
Advances in Intelligent Systems and Computing, 2014
ABSTRACT Emotional state classification of human speech and recognition accuracy of the classifie... more ABSTRACT Emotional state classification of human speech and recognition accuracy of the classifiers is disclosed in this paper. Recent developments in speech recognition places more emphasis on the extraction of information about the speech source. This means obtain information about who and how it was said. This article describes research which seeks to recognize the information from speaking, emotional state in particular. Emotional state is recognized by using different classifiers and features of speech by nowadays known systems. Berlin database of emotional recordings was used to train and test the system. Mel-frequency spectral coefficients and dynamic coefficients were extracted from the audio signal of the database. For classification were used Gaussian Mixture Model, k-Nearest Neighbours and Artificial Neural Networks methods. The main effort of this research is to examine the accuracy and usability of classifying methods for detection of human stress status from his speech.
Wireless Sensing, Localization, and Processing IX, 2014
ABSTRACT New applications in wireless environments are increasing and keeping even more interests... more ABSTRACT New applications in wireless environments are increasing and keeping even more interests from the developer companies and researchers. In particular, in these last few years the government and institutional organization for road safety spent a lot of resources and money to promote Vehicular Ad-Hoc Network (VANET) technology, also car manufactures are giving a lot of contributions on this field as well. In our paper, we propose an innovative system to increase road safety, matching the requests of the market allowing a cooperation between on-board devices. The vehicles are equipped with On Board Unit (OBU) and On Board Radar Unit (OBRU), which can spread alerting messages around the network regarding warning and dangerous situations exploiting IEEE802.llp standard. Vehicles move along roads observing the environment, traffic and road conditions, and vehicles parameters as well. These information can be elaborated and shared between neighbors, Road Side Unit (RSU)s and, of course, with Internet, allowing inter-system communications exploiting an Road Traffic Manager (RTM). Radar systems task it the detection of the environment in order to increase the knowledge of current conditions of the roads, for example it is important to identify obstacles, road accidents, dangerous situations and so on. Once detected exploiting onboard devices, such as Global Position System (GPS) receiver it is possible to know the exact location of the caught event and after a data elaboration the information is spread along the network. Once the drivers are advised, they can make some precautionary actions such as reduction of traveling speed or modification of current road path. In this work the routing algorithms, which have the main goal to rapidly disseminate information, are also been investigated.
Wireless Sensing, Localization, and Processing IX, 2014
ABSTRACT Many recent research efforts have confirmed that, given the natural evolution of telecom... more ABSTRACT Many recent research efforts have confirmed that, given the natural evolution of telecommunication systems, they can be approached by a new modeling technique, not based yet on traditional approach of graphs theory. The branch of complex networking, although young, is able to introduce a new and strong way of networks modeling, nevertheless they are social, telecommunication or friendship networks. In this paper we propose a new modeling technique applied to Wireless Sensor Networks (WSNs). The modeling has the purpose of ensuring an improvement of the distributed communication, quantifying it in terms of clustering coefficient and average diameter of the entire network. The main idea consists in the introduction of hybrid Data Mules, able to enhance the whole connectivity of the entire network. The distribution degree of individual nodes in the network will follow a logarithmic trend, meaning that the most of the nodes are not necessarily adjacent but, for each pair of them, there exists a relatively short path that connects them. The effectiveness of the proposed idea has been validated thorough a deep campaign of simulations, proving also the power of complex and small-world networks
This paper explains many of the issues facing Voice over IP (VoIP). Many of these issues, such as... more This paper explains many of the issues facing Voice over IP (VoIP). Many of these issues, such as compression/decompression of the speech frame and propagation delay, are inherent to VoIP. With careful planning and solid network design these effects on VoIP networks can be minimized. This paper details these various issues and explains how they can affect packet networks.