Stamatis Voliotis | Technological Educational Institute of Sterea Ellada (original) (raw)

Papers by Stamatis Voliotis

Proceedings of the 3rd International Workshop on Wireless Information Systems, 2004

Deployment of a global all IP wireless/mobile network is not a straightforward decision. Heteroge... more Deployment of a global all IP wireless/mobile network is not a straightforward decision. Heterogeneous mobile networks combined with wireless "hot-spot" locations seams to be one of the most realistic early deployments. Commercial public wireless LAN solutions however offer proprietary location management capabilities compared to the traditional cellular networks. The increasing demands for heterogeneous services necessitate fast and efficient location management mechanisms that allow the future personal communication service network to locate mobile users roaming across different systems. This paper introduces and analyzes a Path Location Register (PLR) mechanism for Location Management that reduces significantly the cost of mobile terminal location update and paging. The performance evaluation of the PLR scheme demonstrates its effectiveness in next generation heterogeneous mobile networks.

Proceedings of the International Neural Networks Society, 2021

Ψηφιακά Συστήματα Ι [ΤEΙ ΧΑΛΚΙΔΑΣ, ΣΧΟΛΗ ΤEΧΝΟΛΟΓΙΚΩΝ EΦΑΡΜΟΓΩΝ, ΤΜΗΜΑ ΗΛEΚΤΡΟΛΟΓΙΑΣ (Μeταφέρθηκe... more Ψηφιακά Συστήματα Ι [ΤEΙ ΧΑΛΚΙΔΑΣ, ΣΧΟΛΗ ΤEΧΝΟΛΟΓΙΚΩΝ EΦΑΡΜΟΓΩΝ, ΤΜΗΜΑ ΗΛEΚΤΡΟΛΟΓΙΑΣ (Μeταφέρθηκe σe άλλο Ίδρυμα)]

The paper describes an environment representation applicable to in-door obstacle avoidance and in... more The paper describes an environment representation applicable to in-door obstacle avoidance and in-door navigation of mobile robots. The method, namely range histogram, is based on previous work on VFH (vector Field Histogram) and AXH (Active Kinematic Histogram) incorporating histogramic representation techniques to achieve low complexity in environment representation. Based on range histogram real-time obstacle avoidance algorithms are proposed that exploit the range histogram to perform in-door navigation. The method is applied on a test bed mobile robot. A new method of environment representation and obstacle avoidance for in-door navigation4 is presented. The method is applied on a specially developed mobile robot aiming human- machine collaboration. The overall goal is to achieve three modes of operation: the manual mode (human control), the shared control mode and the autonomous mode (unsupervised control). The range histogram method is developed to support the autonomous mode...

This paper presents an algorithm for input output decoupling of nonlinear systems with the use of... more This paper presents an algorithm for input output decoupling of nonlinear systems with the use of a dynamic precompensator. The algorithm has a simple form. Accordingly necessary and sufficient conditions are established which guarantee solvability of the problem. In concluding the significant reduction in computation time with respect to an existing algorithm is demonstrated.

Vehicular Communications, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Sensors, 2019

The recent advancements in the fields of artificial intelligence (AI) and machine learning (ML) h... more The recent advancements in the fields of artificial intelligence (AI) and machine learning (ML) have affected several research fields, leading to improvements that could not have been possible with conventional optimization techniques. Among the sectors where AI/ML enables a plethora of opportunities, industrial manufacturing can expect significant gains from the increased process automation. At the same time, the introduction of the Industrial Internet of Things (IIoT), providing improved wireless connectivity for real-time manufacturing data collection and processing, has resulted in the culmination of the fourth industrial revolution, also known as Industry 4.0. In this survey, we focus on the vital processes of fault detection, prediction and prevention in Industry 4.0 and present recent developments in ML-based solutions. We start by examining various proposed cloud/fog/edge architectures, highlighting their importance for acquiring manufacturing data in order to train the ML a...

Energies, 2019

The aim of this article is to highlight the impact of a periodic power source, such as a tidal tu... more The aim of this article is to highlight the impact of a periodic power source, such as a tidal turbine, on the operation and sizing of an autonomous hybrid microgrid with photovoltaic panels and storage. The technique of hill climbing (repeated local search) is used to find the optimum combination of Renewable Energy Sources (RES) and storage units with respect to the required capital cost for various load curves and weather conditions. To model the operation of the microgrid devices, analytical and phenomenological models, have been used, which take into account the specifications of actual commercial devices. Six different case studies are presented, with and without a tidal generator, which are based on six different sets of electrical consumption data corresponding to the Euripus campus of the National & Kapodistrian University of Athens (NKUA) in Psachna, Evia, Greece, and respective meteorological and tidal current data from the region. The results show that tidal energy may b...

IEEE Wireless Communications, 2016

With vehicle-to-vehicle and vehicle-to-infrastructure communications gaining momentum, immense op... more With vehicle-to-vehicle and vehicle-to-infrastructure communications gaining momentum, immense opportunities for developing a new application gamut open up. These range from applications targeting security/safety and efficient transportation to in-car entertainment enjoying multi-player mixed-reality games. The potential of VANETs has been recognized by standardization bodies and other stakeholders, including car manufacturers, that have established multiple consortia and initiatives to explore the capabilities of VANET technologies. From the communication technology perspective, the high speed at which nodes move in VANETs together with the adverse environmental conditions (rapidly changing surroundings, weather, etc.) present great challenges. These have attracted the interest of researchers who have sought to evaluate the performance of these systems, mostly paying attention to the lower layers of the protocol stack (physical and MAC). In this article, we explore the network architecture and protocol stack for supporting a broad range of infotainment applications in VANETs based on IEEE 802.11p and assess VANETs' capabilities to support networked multimedia. To this end, our evaluation focuses on application-layer performance for video streaming over a prototype system based on NEC's Linkbird-MX devices.

MATEC Web of Conferences, 2016

Wireless Sensor Networks (WSN) applications continue to expand and already cover almost all our d... more Wireless Sensor Networks (WSN) applications continue to expand and already cover almost all our daily activities improving from security and environmental efficiency to gaming experience. The diverse applications running on top of WSNs have led to the design of an immense number of routing protocols. Few years ago, the IETF standardized the IPv6 routing protocol for low-power and lossy networks (RPL) which is based on routing metrics to build communication paths between a source and the destination node. While significant efforts have focused on the design of routing metrics that satisfy the various applications, limited work has been reported on validating their performance using real-life motes. In this paper, we focus on validating the simulation results (obtained through the JSim simulator) using TelosB motes for a set of routing metrics that have been proposed in our previous articles.

Proceedings of the 1988 IEEE International Conference on Systems, Man, and Cybernetics

ABSTRACT

Proceedings EC-VIP-MC 2003. 4th EURASIP Conference focused on Video/Image Processing and Multimedia Communications (IEEE Cat. No.03EX667)

Digital signal processing development and testing can considerably benefit by utilising an embedd... more Digital signal processing development and testing can considerably benefit by utilising an embedded, fully programmable platform architecture, independent from the particular, under development, algorithmic set. In this paper we present a fully programmable platform that integrates a mixture of digital signal processor (DSP) cores and field programmable gate arrays (FPGAs) along with a control and management microprocessor. This system may offer an ideal platform for bridging the gap between simulations and laboratory tests/field trials. Moreover, such a platform can be considerably helpful not only on digital systems development, but also as an educational platform for courses like digital signal processing, embedded microprocessors programming and VHDL programming.

Journal of Optoelectronics and Advanced Materials

In this paper we present experimental results on the torsional dependence of amorphous magnetostr... more In this paper we present experimental results on the torsional dependence of amorphous magnetostrictive wires by using three different magnetic techniques in order to evaluate and compare them, namely magnetostrictive delay line, the stress-impedance and the domain wall nucleation and propagation techniques. We determined monotonic response in the stress-impedance and domain wall nucleation and propagation set-ups even in the as cast form. Concerning the magnetostrictive delay line, induced magnetic anisotropy was required to obtain monotonic response. The most sensitive response was obtained by using the delay line technique, although the power consumption was higher.

In this paper we present results on load sensors based on the magnetostrictive delay technique. T... more In this paper we present results on load sensors based on the magnetostrictive delay technique. The sensors translate the displacement of soft magnetic plate, hard magnetic disk and aluminium disk into force with respect to three different magnetostrictive delay line set-ups. The range of displacement determines the range of measurable load. Stainless steel springs have been used as active core supports. The best results both in sensitivity and repeatability have been obtained using soft magnetic plate as active core.

2007 14th International Workshop on Systems, Signals and Image Processing and 6th EURASIP Conference focused on Speech and Image Processing, Multimedia Communications and Services, 2007

The Wireless Visual Sensor Networks (WVSN) target a large variety of distributed, wireless, strea... more The Wireless Visual Sensor Networks (WVSN) target a large variety of distributed, wireless, streaming multimedia networking applications' areas, ranging from home surveillance to military and deep space applications. However, there are a number of open issues that have to be carefully realized before visual sensor webs become widely available. In this paper, we highlight some of the main open issues and challenges, focusing on the networking characteristics. Moreover, we propose a wireless sensor node protocol stack that takes into account the foreseen networking and A/V requirements of the WVSN applications.

IEE Proceedings D Control Theory and Applications, 1992

ABSTRACT Presents an algorithm of trajectory planning for wrist partitioned robotic manipulators.... more ABSTRACT Presents an algorithm of trajectory planning for wrist partitioned robotic manipulators. The desired translational trajectory is defined as a continuous function in Cartesian co-ordinates. The desired orientation is defined as a continuous function of the Frenet frame. Therefore, orientation is planned without influence of geometric changes along the translational path. The path is generated as a sequence of elementary motions. Each new position is defined as a function of the previous one. After having derived a position, the orientation is planned using a maximising process. The present algorithm avoids singularities, because there is no need of using the inverse kinematics.

ABSTRACT Wireless Sensor Networks (WSN) are quickly gaining popularity due to the fact that they ... more ABSTRACT Wireless Sensor Networks (WSN) are quickly gaining popularity due to the fact that they are potentially low‐cost solutions that can be used in a variety of application areas including emergency response, medical monitoring, homeland security and environmental monitoring. However, due to their wireless nature, the relevant security requirements form a quite extensive list. An important subset of their security threats can be addressed implementing a trust management system, which establishes trust relationships among the network nodes. The methods for calculating trust via concatenation and multipath propagation are referred to as trust models. For a complete estimation of such a scheme not only computational complexity, but also the level of increase of the total network throughput and the impact on energy consumption must be thoroughly examined in order to evaluate its effective applicability in AWSN networks.

2008 IEEE International Symposium on Consumer Electronics, 2008

Wireless Sensor Networks (WSN) are expected to form an integral part of the foreseen ubiquity int... more Wireless Sensor Networks (WSN) are expected to form an integral part of the foreseen ubiquity intelligent, future mobile network and are envisaged to play a key role in the vision of offering mobile, personalised services, in-home and outdoors , whenever and wherever needed. However, security and resilience across WSN, especially across insecure, heterogeneous and multi-administration domains like the augmented home environment, face essential limitations. In this paper, we aim to identify the major WSN open issues, challenges and functional holes, focusing on the networking characteristics in an augmented home environment.