Jozef Papan

University of Žilina

Data analytics is an inseparable part of the current information systems. Various tools can provide the analysis and produce results in any graphical form, enclosed by the complex filtering. Behind the scenes is a data layer and methods for accessing, manipulating, and processing data. SQL language and databases can serve that. This paper deals wit...

The paper is devoted to a research area focused on solving problems associated with outages and connection interruptions in modern IP networks. The goal is to design and implement such a mechanism that ensures the change of the original route through an exact order of routers in the alternate route. The restoration of the connection through an alte...

Databases form an inseparable part of the information systems. They hold the data formed by the data models. Data are operated by the database management system, which takes an interlayer between the data and the external environment. They can be purely obtained from the database using the Select statement or can act as the inputs for the function...

A wireless sensor network (WSN) is a network that monitors the physical environment using small and energy-efficient sensor devices. The wide application of WSNs has caused them to be used in critical applications that require a quick response, even at the cost of higher consumption. In recent years, Fast Reroute (FRR) technology has been developed...

In software-defined networks (SDN), proactive and reactive response procedures to line or node outages or failures are used, often not reflecting the escalating demands of deployed applications. With the expanding deployment of SDN in the IoT, medical equipment, and military infrastructure, the requirements for stable data transmission are increasi...

Currently, network requirements are placed on the efficiency and size of the networks. These conditions can be ensured by modern converged networks that integrate the functions of both data and telecommunication networks. Line or router failures have always been a part of transmission networks, which is no different from converged networks. As a re...

The advanced tensor solution to the problem of inter-domain routing with normalized Quality of Service under hierarchical coordination in a communication network is proposed in the paper. The novelty of the method based on the tensor model lies in the more flexible load balancing over the network due to the presence of requirements to average end-t...

Data retrieval, access, and tuple identification are inevitable in database processing, ensuring performance. The entities and relationships form a relational database. Data themselves are not specifically formatted, requiring sequential data block scanning if the particular index is unavailable. This paper summarizes existing indexing principles f...

IP networks have evolved into converged and multimedia platforms. These networks nowadays support diverse service types, including crucial and real-time applications. However, these services have higher requirements on network performance and are negatively impacted by the unpredictable failure. When a line or node failure occurs, the convergence p...

Multimedia services are among the most developed segments of services. User behavior is changing with a significant number being very active. They utilize services that produce large amounts of data traffic in uplinks. Consequently, this is quite a new phenomenon that service providers should consider. The Quality of Service (QoS) of real-time mult...

In the article, we present the research and development of an improved delay-sensitive routing tensor model for the core of the IoT network. The flow-based tensor model is considered within the coordinate system of interpolar paths and internal node pairs. The advantage of the presented model is the application for IoT architectures to ensure the Q...

The massive development of virtualized infrastructures, Internet of Things (IoT), and Wireless Sensor Network (WSN) in recent years has led to an increase in quality requirements for the management and reliability of underlay communication networks. Existing converged networks must therefore guarantee specific quantitative and qualitative parameter...

Today's IP networks are experiencing a high increase in used and connected Internet of Things (IoT) devices and related deployed critical services. This puts increased demands on the reliability of underlayer transport networks. Therefore, modern networks must meet specific qualitative and quantitative parameters to satisfy customer service demands...

The sprawling nature of Internet of Things (IoT) sensors require the comprehensive management and reliability of the entire network. Modern Internet Protocol (IP) networks demand specific qualitative and quantitative parameters that need to be met. One of these requirements is the minimal packet loss in the network. After a node or link failure wit...

Abstract —When a routing protocol detects a link or node failure, a network convergence process starts in the network. This process may take from a few hundred ms to tens of seconds. During this process, the data affected by specific failure is permanently lost. For these reasons, Fast ReRoute (FRR) has been developed. FRR is a technology, that min...

We consider an ideal link with bounded, independent, and identically distributed stochastic arrival and capacity processes. We use the theory of effective bandwidth and the theory of generating functions to improve known results about the queue process. Specifically, we prove better bounds on the probability distribution function and the tail distr...

IP Fast Reroute (IPFRR) is resiliency technology to provide fast traffic recovery upon link or node failure for mission critical services. This technology is able to recover impacted traffic in 50 ms upon any single link or node failure. The key aspect of IP Fast Reroute technology is fast failure detection and pre-calculation of alternative path i...

The network convergence time may take hundreds of milliseconds or more. Since this repair performance may be unsatisfactory, IP fast reroute (IPFRR) approaches have been developed to decrease the network convergence time and minimize traffic loss. These IPFRR mechanisms are usually based on the proactive precomputation of a backup path before a fai...

Computer networks play an important role in modern industrial environments, as many of their areas heavily depend on continued operation and availability of provided network services. However, the network itself faces many security challenges in the form of various massive attacks that prevent its usage and yearly cause huge financial losses. The m...

The primary idea of the IP Fast Reroute (IPFRR) technology is to reduce the network recovery time after a link or router failure within an ISP network. The key feature of existing IPFRR mechanisms for reaching low recovery time is the usage of pre-computed alternative backup paths. These alternative backup paths have to be pre-calculated before a n...

When a link or router failure occurs in a routed network, there is unpredictable period of network traffic interruption. This problem persists until network reconverges on the new topology. New technology which solves these problems after link or router failure has been developed - IP Fast Reroute (IPFRR).

In the beginning, this paper describes basic overview of attacks on TCP/IP stack in general. In the next section, there is overview of security of signalization and description of techniques used to secure signalization in multimedia communication. Then, there are described techniques of multimedia security. The last part of the paper deals with a...

A smart home is being an important part of research due to its impact on the life of many people, who decide to try this partially known concept of building and controlling their houses. In this paper we present a little different approach to the implementation of a smart home structure and its methods in real environment. As a part of the work we...

In the beginning, this paper describes basic overview of cloud. What is a cloud, what types of a cloud do we know, types of network mechanisms used in clouds nowadays. Next, there is description of OpenStack, one of most widely deployed cloud infrastructure. This is followed by description of Cloud implemented on Department of InfoCom networks on U...

After a link or router failure within a network, a process of network convergence starts. During this process, the network is experiencing serious connectivity issues, in which different destinations may become unreachable and which may cause difficulties for critical and sensitive services. In order to address these issues, IP Fast ReRoute (IPFRR)...

The interest in integrating real-time and real-time multimedia communication features into IP networks and its applications, the web including, started a development effort, which brings several new communication technologies. These technologies are influencing many aspects of our lives now, education not excluding. The Session Initiation Protocol...

After a network node or a link fails, an unpredictable period of time ensues during which the network communication is disturbed. This period encompasses the time necessary for the network to reconverge on new shortest paths. This process may last from a few miliseconds up to tens of seconds. The time heavily depends on the physical topology and th...

After a link or a node failure within a network, there is unpredictable period of time when part of traffic is lost until the network reconvergence will complete. During this period of disruption specific networks are not available and problems with critical applications and services, such as the Voice over IP, might occur. Network reconvergence mi...

Over the last few years, Internet Protocol (IP) networks have made significant progress, allowing to provide voice over IP (VoIP) and other real-time services. The quality of provided real-time services depends on quality parameters of the network (QoS). One of the leading QoS parameters is the survivability of network itself. The survivability par...

Term eLearning is after more than ten years a key term that is understood by public as any electronic support of education. Plenty of projects, great interest from teachers and students is a foundation for its use at all the forms of education. Despite great effort is education today still mostly traditional - face to face - on all the levels of ed...

Illegal logging is in these days widespread problem. In this paper we propose the system based on principles of WSN for monitoring the forest. Acoustic signal processing and evaluation system described in this paper is dealing with the detection of chainsaw sound with autocorrelation method. This work is describing first steps in building the integ...