Martin Klimo

Martin Klimo
University of Žilina · Department of Information Networks

Professor Emeritus

About

44
Publications
8,826
Reads
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128
Citations
Introduction
Martin Klimo received his diploma in telecommunication engineering from the University of Transport and Communication (UTC) Zilina in 1973. From 1973 to 1990 he was an Assistant Professor on Technical Cybernetics at UTC. Since 1990 he worked as Associated Professor, and in 2008 he was appointed a professor of Applied Informatics.
Additional affiliations
September 2005 - October 2014
University of Žilina
Position
  • Professor (Full)

Publications

Publications (44)
Article
Full-text available
One-hot encoding is the prevalent method used in neural networks to represent multi-class categorical data. Its success stems from its ease of use and interpretability as a probability distribution when accompanied by a softmax activation function. However, one-hot encoding leads to very high dimensional vector representations when the categorical...
Article
The current trend in transport (road, railway, unmanned aerial vehicle) introduces autonomous transport means. As the autonomy of vehicles increases, situations arise for which the models have not been trained, which increases the safety risk. Therefore, we propose systems that would detect such “anomaly” situations. We designed two anomaly detecto...
Article
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...
Article
While the main application of resistive switching structures currently targets non-volatile memories, increasing interest is being focused on their logic applications. Resistive switches are suitable for Boolean logic, neuromorphic computing and for implementation of Zadeh fuzzy logic. In this work, we analyzed implementation of the resistive switc...
Article
Adaptation of synaptic strength is central to memory and learning in biological systems, enabling important high-level processes such as the ability of animals to respond to a changing environment. Memristor devices are a promising new, nanoscale technology that emulates the function of synapses and can therefore be used to represent synaptic eleme...
Article
In our contribution we present and analyze implementation of the resistive switching structures for logic application based on Zadeh fuzzy logic. Resistive switching structures based on HfOx and TaOx were connected in an anti-serial configuration (complementary resistive switch). The complementary resistive switches integrated into logic circuit fo...
Conference Paper
Full-text available
Today's digital computers are based on three cornerstones: von Neumann architecture, Boolean algebra, and transistor as the basic element. With a history of approximately 70 years, this concept has demonstrated to be a success for algorithmic computing. However, at present, its disadvantages can be seen in real-time cognitive computing. This contri...
Article
A four input analog odd-even merge-sort network using resistive switching cells is simulated. Hopes are for such networks to be small in size, energy efficient and fast. In the simulations input potentials are sorted by silver iodide electrochemical metallization memory cells, as these cells are well suited for this application. Here we demonstrate...
Article
Convolutional neural networks exhibit state-of-the-art performance in many image recognition tasks. Their software implementation on computers with von Neumann architecture limits the size of tasks that are possible to solve in real time. Therefore, hardware implementations are also important, and memristive circuits are a promising new technology...
Article
Full-text available
We present a new way to passively implement permutation circuits, a concept of importance in bit-oriented or line-oriented designs, used in communications, cryptography, field-programmable gate arrays or next-generation pulsed neural networks. We argue that the proposed implementation is more reliable and efficient than previous designs when the nu...
Article
We consider the ability of a very simple feed-forward neural network to discriminate phonemes based on just relative power spectrum. The network consists of two neurons with symmetric nonlinear response over a spectral range. The neurons are built from complementary resistive switches. The output of the neurons is subsequently fed to a comparator....
Article
Ordered Weighted Average is a class of aggregators that generalize the concepts of median, minimum and maximum. An important feature of these aggregators is that they can be readily implemented in hardware. In our work we study whether these aggregators can be advantageously used to aggregate decisions by the group of experts. The experts in questi...
Article
Resistive switching in thin-film solid state devices is a rapidly progressing research area. Several new devices and applications, based on resistive switching, were proposed. The devices fall into realm of unconventional computing. In this paper we present memristor implementation of fuzzy logic. We describe fuzzy logic operations, simulation meth...
Article
Pattern matching is a machine learning area that requires high-performance hardware. It has been hypothesized that massively parallel designs, which avoid von Neumann architecture, could provide a significant performance boost. Such designs can advantageously use memristive switches. This paper discusses a two-stage design that implements the induc...
Conference Paper
Full-text available
We describe an audio visual speech recognition system (A VSR) based on fuzzy logic networks. Our system is able to recognize any time sequences and achieves positive results in the task of vowel recognition. Proposed design relies on new model and methods for training fuzzy logic circuits. We combine a simple combinatorial circuit, trained with gen...
Conference Paper
The need of high capacity, high density and fast memories yields to new memories types. One of the most discussed successors of Flash memories are the resistive switches. Using memristors it is possible not only to store information or perform logic operations but also multiple unconventional computing applications were proposed. Therefore is the n...
Article
Full-text available
We consider the ability of a very simple feed-forward neural network to discriminate phonemes based on just relative power spectrum. The network consists of two neurons with symmetric nonlinear response over a spectral range. The output of the neurons is subsequently fed to a comparator. We show that often this is enough to achieve complete separat...
Conference Paper
Memristors may find their use in many applications - mainly as memory or logic and also as fuzzy systems or neuromorphic systems. High amount of scientific papers show that the research of memristors draws a lot of attention recently. Memristor models are briefly described in this paper and we present our results obtained from measurements. The goa...
Article
Full-text available
This paper proposes a massive fuzzy logic network which can be considered as a novel model of pattern classification network. Our approach introduces fuzzy logic circuits fulfilling the function of a binary classifier at first, which are connected into fuzzy logic networks with fuzzy flip-flop circuits as memories. Genetic programming is used as a...
Chapter
Resistive memory (RRAM) is based on two-terminal resistive switches whose states can be reconfigured with external pulses. RRAM has attracted significant interest recently as a promising candidate for future high-density, high-performance memory applications. Memristors hold promise for use in diverse applications such as memory, logic, analog circ...
Article
Full-text available
This paper proposes a massive fuzzy logic network which can be considered as a novel model of pattern classification network. Our approach introduces massive fuzzy logic circuits fulfilling the function of a binary classifier, which are connected into networks with fuzzy flip-flop circuits as memories. Genetic programming is used as a circuit desig...
Conference Paper
Full-text available
This paper proposes a new approach for lip reading. Most existing systems for lip reading utilize a kind of neural network or hidden Markov models as classifiers. We propose a new approach where fuzzy combinational networks with fuzzy flip-flop memories are combined into one network. Our model introduces a hierarchical structure of this network, wh...
Book
Full-text available
Dlhoročné skúsenosti s vyučovaním na technických vysokých školách nás presviedčajú o tom, že definície, vety a tvrdenia, tak ako sa učia v matematike, sú pre veľkú časť študentov inžinierskeho zamerania príliš abstraktné. Namiesto pomoci, ktorú matematika môže študentovi ponúknuť, sa tak stáva strašiakom, ktorý mu nedovolí urobiť potrebný krok medz...
Article
Full-text available
In our work we propose implementing fuzzy logic using memristors. Min and max operations are done by antipodally configured memristor circuits that may be assembled into computational circuits. We discuss computational power of such circuits with respect to m-efficiency and experimentally observed behavior of memristive devices. Circuits implemente...
Article
Full-text available
A modular based system for synthesis of a written text allows solving partial problems separately. If there is designed a logical structure with clear interfaces, it could be possible to prepare modules for variant processes by different members of the team, without necessity of the coordinated work. The paper deals with a module for engine reading...
Book
Full-text available
IP telephony uses a different type of technology for voice transmission than that used in the case of classical telephony. Therefore, the problems encountered in the transmission of speech over data networks are different than in the analog case. In this book the authors explain the problem and some solutions.
Book
Full-text available
The methods that are explained in this textbook (based on linear spaces) are not better than those a human would use for the analysis of a small amount of data based on experience. However, today it is necessary to constantly analyze a very large number of processes, often in unfavourable conditions and with a short reaction time. In these conditio...
Article
Full-text available
Analogy of random intervals between two transport units and words of unary binary code is analyzed. This way, article is pointing to questions, which are common for transport theory and theory of information, which allows usage of theory of information results in tranport. These are not only questions of quantification of assortness (entrophy) of t...
Article
Full-text available
This paper describes a way of extending standard SSML language that is primary used for annotating input text into fully structural content used internally for speech synthesis. It explains approach used for processing such SSML input using rule based engines technology and implicit invocation. For reasoning in implicit invocation a formal language...
Article
Full-text available
Jitter buffers in IP phones have various mechanisms for jitter elimination. To measure how effective these implementations are, we need to compare quality mea-sured using IP phone to default quality for each jitter that could occur in real IP network. Reference model specifying the default quality for each jitter does not exist so far, therefore we...
Article
Full-text available
Quality of the IP telephony service can be measured as a composition of many parametres. Some of the parametres of quality of IP telephony service can be measured by secondary characteristics of difference between received and transmitted signal. The aim of this paper is to derive estimations for mean power of noise. Using non orthogonal basis the...
Article
Full-text available
Při přenosu řeči v službě IP telefonie se při přenosu řeči využívá princip přepojování paketů. Z důvodu náhodného opždění paketů při přenosu sítí, některé pakety překročí povolenou hranici zpoždění a jsou při přehrávání nahrazené tichem. Rozdíl mezi původním a přehrávaným signálem se označuje jako šum. V článku je popsáno jak ztráta vzorků řečového...
Article
Full-text available
Digitální telefonní sítě jsou založené na přenosu vzorků řeči. Výkonnost dnešních procesorů umožňuje výpočet všeobecných koeficientů rozkladu řeči do prostorů generovaných posunutými funkcemi. V tomto článku je modifikovaná podmínka pro použití v aplikacích týkajících se přenosu hlasu internetem (VoIP), když se nepoužívá celý průběh signálů, ale je...
Article
Full-text available
Technologies for transporting voice over networks based on IP protocol, known under various names, e.g., Voice Over IP (VoIP), Voice on the Net (VoN), IP telephony (below IP telephony), made a great progress in the last decade. IP telephony has become one of the most important and the most rapidly developing Internet technologies that is offering a...
Conference Paper
In this paper we would like to present a diphone-based Text-to-Speech system for the Slovak language. The system uses a synthesis kernel developed at our department, and a diphone database created for the Slovak language. The text-analysis module and the text-synthesis module are described in details. For the synthesis itself we use our synthesis k...
Article
Full-text available
Článek vysvětluje základní myšlenky zevšeobecněného vzorkování, které se dá použít pro přenos hlasu pomocí paketů, jestliže se může vyskytnout ztráta paketů. Vysvětleny a dokázány jsou základní vlastnosti, které má mít signál v spektrální oblasti, jestliže má generovat bázi spolu se signály, které vzniknou jeho rovnoměrným posouváním v čase. Článek...
Article
Full-text available
Communication networks play an important infrastructural role in the crisis management. To fulfill this role, they have to be robust enough. The robustness is an aspect, which will have to be taken into account also in NGNs (Next Generation Networks). The paper introduces a reference model of the architecture and protocols for robust NGNs. Based on...
Article
Full-text available
IP phone manufacturers do not publish how the jitter buffer in their IP phone is implemented. Therefore we decided to do the reverse engineering process. We simulated network traffic with the degradations, tested IP phones and tried to find out, how the jitter buffer is implemented. In this paper we describe testing of the VoIP QoS with different I...
Article
This document describes technologies that enable Network Service Providers to offer tighter Service Level Agreements for data networks, in order to create competitive advantage and better serve their customers. The SLA parameters that need to be tightened will be defined and then the tools that should be considered are described, together with the...

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