Dr. PANOS PAPAZOGLOU
PUBLICATIONS
Selected University Books


P. Papazoglou, The Ultimate Educational Guide to MIPS Assembly Programming, ISBN 978-1727880878, Nov 2018, Pages 266, Amazon, USA

P. Papazoglou, An Educational Guide to the AVR Microcontroller Programming, ISBN 978-1986008396, Mar 2018, Pages 284, Amazon, USA

in GREEK
P. PAPAZOGLOU , S-P. LIONIS (2017), Application Development with Arduino, 2nd Edition, ISBN 978-960-418-550-4, pages: 544,  Tziolas Publications, Thessaloniki

P. PAPAZOGLOU (2017), AVR Microcontroller, Architecture and Programming, ISBN 978-960-418-712-6, pages: 536, Tziolas Publications, Thessaloniki

P. PAPAZOGLOU (2015), Microprocessors, Principles & Applications, ISBN 978-960-418-508-5, pages: 824, Tziolas Publications, Thessaloniki

P. PAPAZOGLOU , S-P. LIONIS (2014), Application Development with Arduino, 1st Edition, ISBN 978-960-418-459-0, pages: 356, Tziolas Publications, Thessaloniki

P. PAPAZOGLOU (2011), Computer Architecture & Assembly Programming, ISBN 978-960-93-3118-0, pages: 304, P. Papazoglou Publications

P. PAPAZOGLOU (2010), Αρχιτεκτονική & Προγραμματισμός μικροεπεξεργαστών, ISBN 978-960-411-710-9, pages: 406, ION Publications, Athens



International Journals


[J10] P.M.Papazoglou
A Hybrid Simulation Platform for Learning Microprocessors, Computer Applications in Engineering Education, Volume 26, Issue 2, March 2018 WILEY (2018)

Modern engineering applications are based on microprocessors and microcontrollers. Thus, the microprocessor (uP) architecture constitutes a core course component in engineering education. Many technologies have been used by the Universities in the past 30 years for learning uPs. In the 1980s, hardware platforms have been used (e.g., MPF-I) for learning assembly programming in hexadecimal mode of popular microprocessor models. The above platforms have been replaced by software simulators where the uP components are represented by visual objects. The software based approaches have lack of uP architecture customization and are limited only in assembly programming. On the other hand, the existing hardware based tools are low level and very complicated. Thus, the students do not work on uP design and assembly language development. In this paper, a novel hybrid simulator platform which changes the educational point of view regarding the uP learning methodology is presented. The proposed hybrid simulation platform (HSP) consists of hardware components which represent the uP architectural units and software components for system operation and administration. Using the HSP, students freely select the uP hardware based components and build their own architecture. On the other hand, professors can create educational scenarios with customizable experimental architectures.


 
[J9] P.M.Papazoglou, D.A.Karras

A Hardware Based Novel Educational Methodology for Teaching Microprocessor Architectures Using Object Oriented Approach, International Review on Computers and Software (IRECOS), Vol 10, No 10, 2015

There is no doubt that computer architecture represents a core course in computer science curriculum. A computer architecture course involves mainly the microprocessor structure and operation which constitutes the heart of the whole system. Due to microprocessor complexity, a number of simulation software solutions have been developed for supporting the corresponding courses. On the other hand, simulators offer only a visual environment where the students cannot change operational or structural characteristics for studying the corresponding microprocessor behavior. Moreover, and much more important is the fact that students cannot demystify the physical level where bit manipulation takes place. A novel and low cost approach for studying in depth microprocessor structure and operation at programming and hardware level is presented and finally proposed for the very first time in this paper. The student uses programmable hardware modules for developing the internal structure of a microprocessor. Finally, the developed microprocessor can be studied from programmer’s or developer’s view.


[J8] P.M.Papazoglou,  D.A.Karras, R.C.Papademetriou

On Multi Agent based modeling and control in large scale wireless communication systems for improved resource allocation performance, Telecommunication Systems, DOI: 10.1007/s11235-011-9658-2, Springer, 2013

The goal of this paper is to investigate the application of the Multi Agent technology in modeling and simulating large scale wireless communication systems. There are very few studies using the multi agent concept as an alternative approach for designing and simulating resource allocation in cellular systems and especially in large scale ones. Thus, a novel modeling methodology of wireless network services exploiting multi agent technology and investigating in depth critical agent issues is proposed in this paper. It is shown that the multi agent concept proves to be a suitable solution for modeling and implementing cellular network services simulation even in the case of large scale wireless networks. The whole investigation is divided in two phases: (a) multi agent modeling analysis and (b) multi agent model development for controlling network performance. Simulation
results show the effectiveness of the proposed multi agent model when is applied in combination with the state of the art event scheduling mechanism.



 

[J7] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On the efficient implementation of a high performance multi-agent simulation system for modeling cellular communications involving a novel event scheduling algorithm, International Journal of Simulation Systems, Science & Technology, Special Issue on: Performance Engineering, Volume 10, Number 1, 2009

Simulation models are used in the design, development and evaluation of wireless communication systems. While basic network entities as Base Stations and users are always taken into account in such simulation modeling, a critical but currently underestimated factor that affects the simulated network behavior is the corresponding simulation model which represents the physical activities and the events of the network. A novel event scheduling mechanism for supporting concurrent network events and a novel network modeling methodology based on the multi-agent concept implemented through multi-threading technology is presented in this paper. The state of the art event scheduling mechanism supports only sequential events and on the other hand, the multi-agent technology has been used only for modeling network nodes. Additionally, the technical aspects of the multi-threading technology regarding the agent implementation and scheduling for simulating wireless communication systems has not been investigated so far in the literature. The proposed simulation framework in this paper gives improved solutions to the above issues.

 

[J6] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

An Improved Multi-Agent Simulation Methodology for Modelling and Evaluating Wireless Communication Systems Resource Allocation Algorithms, Journal of Universal Computer Science, 2008, vol.14, issue 7, pp. 1061-1079

Multi-Agent Systems (MAS) constitute a well known approach in modelling dynamical real world systems. Recently, this technology has been applied to Wireless Communication Systems (WCS), where efficient resource allocation is a primary goal, for modelling the physical entities involved, like Base Stations (BS), service providers and network operators. This paper presents a novel approach in applying MAS methodology to WCS resource allocation by modelling more abstract entities involved in WCS operation, and especially the concurrent network procedures (services). Due to the concurrent nature of a WCS, MAS technology presents a suitable modelling solution. Services such as new call admission, handoff, user movement and call termination are independent to one another and may occur at the same time for many different users in the network. Thus, the required network procedures for supporting the above services act autonomously, interact with the network environment (gather information such as interference conditions), take decisions (e.g. call establishment), etc, and can be modelled as agents. Based on this novel simulation approach, the agent cooperation in terms of negotiation and agreement becomes a critical issue. To this end, two negotiation strategies are presented and evaluated in this research effort and among them the distributed negotiation and communication scheme between network agents is presented to be highly efficient in terms of network performance. The multi-agent concept adapted to the concurrent nature of large scale WCS is, also, discussed in this paper.




[J5] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Improved Integral Channel Allocation Algorithms in Cellular Communication Systems Enabling Multimedia QoS Services, WSEAS Transactions on Communications, Issue 10, vol. 7, pp. 1014-1023,2008, Included in ISI/SCI Web of Science and Web of Knowledge, indexed by ACM, Elsevier, H Index: 5, SJR : 0.04

While bandwidth management in cellular communication systems has been thoroughly examined for voice channel admission by developing several DCA (Dynamic Channel Assignment) strategies, there are a few only efforts investigating assignment and management of multimedia enabling channels in wireless communications. However, the increasing demand for these advanced services in cellular networks such as data, MMS and video transfers raises the problem of efficient bandwidth management in terms of channel assignment meeting QoS criteria. Several algorithms for supporting QoS services have been presented in the literature based mainly on bandwidth reservation and capacity management for enabling efficient handoff over cellular networks. The goal of this paper is to develop and investigate, however, novel integral DCA algorithms for supporting data (e.g. files) and video (video viewing, video conference) transmission with Quality of Service (QoS), and their evaluation through a prototype advanced statistical simulation environment for cellular communications. Moreover, we analyze the dynamic and distributed channel allocation strategies for enabling advanced multimedia services based on signal purity measures and interference measurements. Finally, the performance of these suggested algorithms evaluated through a proposed prototype simulation environment is discussed.

 

[J4] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On a New Generation of Event Scheduling Algorithms and Evaluation Techniques for Efficient Simulation Modelling of Large Scale Cellular Networks Bandwidth Management Based on Multitasking Theory, WSEAS Journal Transactions on Communications, Issue 10, vol. 7, pp. 1024-1034, 2008, Included in ISI/SCI Web of Science and Web of Knowledge, indexed by ACM, Elsevier, H Index: 5, SJR : 0.04

There are many research efforts for improving bandwidth management in wireless communication systems based mainly on DCA (Dynamic Channel Allocation) Schemes designed and evaluated through various Simulation models which, however, use a common simulation model architecture coming from queuing theory. Although much attention has been paid to Channel Allocation Mechanisms there are few only efforts related to the corresponding simulation models. These models consist of various critical components including network services models and the simulation model architecture organizing network events scheduling, network events handling and network performance evaluation. One of the most critical components is the event scheduling mechanism, which reflects network events as they happen in a real network and which has not been investigated in depth regarding its performance. The state of the art event scheduling mechanism called Calendar Queue (CQ) schedules events for later execution based on the corresponding time stamps of each generated event. The major drawback of this approach is that the generated events are executed only sequentially due to progressive time stamps. On the other hand, events in a real wireless network happen concurrently and so the state of the art mechanism can not reflect such conditions. The goal of this paper is to propose an alternative novel real time scheduling mechanism based on a synthesis of multitasking theory and queuing theory techniques, which could be involved in generating and investigating a new generation of event scheduling algorithms suitable for simulation modelling of cellular networks bandwidth management. This mechanism is analyzed through multitasking theory tools and is shown to face effectively the concurrent nature of the generated network events providing an efficient solution to the Calendar Queue problem.

 

[J3] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

An Efficient Scheduling Mechanism for Simulating Concurrent Events in Wireless Communications Based on an Improved Priority Queue (PQ) TDM Layered Multi-Threading Approach, WSEAS Journal Transactions on Communications, Issue 3, vol. 7, 2008, Included in ISI/SCI Web of Science and Web of Knowledge, indexed by ACM, Elsevier, H Index: 5, SJR : 0.04

The physical activities of a real wireless network are represented by events which are the main components of a discrete event simulation (DES) system and are produced by its event generator during simulation time. Each network service (e.g. voice, data and video) constitutes an event for a particular mobile user. A critical component within the simulation system, called scheduler, runs by selecting the next earliest event, executing it till completion, and returning to execute the next event. Calendar queue is the state of the art implementation of the scheduler among the most popular networking simulation tools such as ns-2. However, Calendar queue time-stamping mechanism presents drawbacks in the case of complex dynamical systems, like wireless networks, where probability of events concurrency is large. In such a case sequential time-stamping of calendar queue scheduling does not reflect real network events occurrence and generation. It should be remarked that there are very few reports if any in the literature concerning research on events scheduling mechanisms in such real time systems. On the other hand, multi-threading technology offers advanced capabilities for modelling concurrent events. The main goal of this paper is to illustrate that multithreading architectures provide the means for designing efficient schedulers in the simulation of wireless networks resource allocation but, also, several critical issues such as deadlocks, synchronization and scheduling must be effectively faced. In this paper, a stable simulation model is presented based on a novel layered thread architecture and on an alternative network event scheduling mechanism, called the Priority Queue (PQ) – Time Division Multiplexing (TDM) Layered Multithreading mechanism, which supports concurrent events as compared to the state of the art approach which supports only sequential events. Moreover, specific drawbacks of the JVM multi-threading platform such as thread execution unpredictability are also faced and presented.


[J2] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On new dynamic channel assignment schemes and their efficient evaluation through a generic simulation system for large scale cellular telecommunications, HERMIS, An International Journal of Computer Mathematics and its Applications, ISSN 1108-7609, Vol. 6, 2006

The rapid evolution of cellular technology and the augmentative user demand for advanced mobile services leads the industry to develop more efficient network structures. The increasing number of cellular users and the demand for broadband mobile communications (3rd and 4th generation) drives to the research of new methodologies for the design of cellular networks and services. Simulation environments more than ever offer the opportunity to develop and study with low cost new structures and methods for the implementation of new services. This paper thoroughly reviews centralized and distributed Dynamic Channel Assignment (DCA) schemes in terms of simulation characteristics and needs and proposes a comprehensive simulation system for evaluating them, which incorporates their principles, entities and concepts involved. The main goal, however, is to present three new DCA variations and prove - through experimental evaluation using the proposed simulation system - that the suggested schemes outperform traditional DCA schemes. The proposed simulation system is implemented in Java, in order to create a high performance generic simulation environment with the future capability of internetworking. The system is designed with the goal to be efficient in simulating large scale generic cellular telecommunication systems and the associated DCA schemes. Moreover, another goal of the proposed system is to serve as a test bed for the evaluation and development of DCA schemes (especially for educational purposes) involved in such large scale cellular systems towards their planning as effective cellular mobile radio networks.

 

[J1] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

High Performance Novel Hybrid DCA algorithms for efficient Channel Allocation in Cellular Communications modeled and evaluated through a Java Simulation System, WSEAS Transactions on Communications, ISSN 1109-2742,Issue 11, vol 5, 2006, pp.2078-2085, Included in ISI/SCI Web of Science and Web of Knowledge, indexed by ACM, Elsevier, H Index: 5, SJR : 0.04

The limited bandwidth and the user demand for advanced mobile services led to the research of new strategies for efficient channel assignment. The role of a channel assignment scheme is to allocate channels to cells or mobiles in such a way as to minimize the probability that the incoming calls are blocked and the probability that ongoing calls are dropped. Advanced services require significant part of the available bandwidth and so efficient bandwidth management through efficient channel assignment must be applied. Channel assignment strategies can be designed and evaluated using a simulation environment specialized in cellular communications. This paper thoroughly reviews distributed DCA schemes and presents several novel efficient variations (e.g. hybrid variation) suitable for large scale cellular systems. In this paper, a comprehensive simulation system for evaluating channel assignment schemes in a detailed level is also presented.


 

International Book Chapters


[B2] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Advances in Large Scale Systems Simulation Modeling using Multi-agent Architectures and Concurrency Supported Scheduling Mechanisms with Application to Wireless Systems Simulation, Book chapter in Recent Advances in Applied Signals, Systems and Image Processing, Springer, ISBN-10: 1402081693, 2014

Simulation technology constitutes the most critical factor for designing and evaluating complex wireless communication systems. Several modelling methodologies have been proposed in the literature for reflecting the wireless network activities within the simulation system. In recent years, the multi agent concept has been used in various studies focused in channel allocation and bandwidth management due to the fact that the physical behaviour of network components such as base stations and cells can be represented more realistically using the agent features. On the other hand, a specialized mechanism called scheduler manipulates the generated events of the network for future execution. The state of the art event scheduling mechanism called Calendar Queue is used in the existing approaches and tools (e.g. ns-2). In this paper, a comprehensive simulation model for simulating large scale wireless networks is proposed. A novel modelling methodology of network services and the corresponding
theoretical analysis and implementation based on the multi agent concept is initially presented. Additionally, a novel and alternative to state of the art event scheduling mechanism based on real time scheduling theory for supporting concurrent network events is also presented. The simulation results show the effectiveness of the concurrent multi agent based models as well as the efficiency of the event interleaving for concurrent network events.

 

[B1] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

New Strategies Based on Multithreading Methodology in Implementing Ant Colony Optimization Schemes for Improving Resource Management in Large Scale Wireless Communication Systems, Book chapter in Intelligent Systems: From Theory to Practice, SCI 299, pp 537-578, Springer, 2010

A great challenge in large scale wireless networks is the resource management adaptability to dynamic network traffic conditions, which can be formulated as a discrete optimization problem. Several approaches such as genetic algorithms and multi agent techniques have been applied so far in the literature for solving the channel allocation problem focusing mainly on network base-stations representation. A very promising computational intelligence technique known as ant colony optimization which constitutes a special form of swarm intelligence has been used for solving routing problems. This approach has been introduced by the authors for improving channel allocation in large scale wireless networks, focusing on network procedures as the basic model unit and not on network nodes as so far reported in the literature. In this paper, a novel channel allocation algorithm based on ant colony optimization and multi agents is thoroughly analyzed as well as important implementation issues based on the multi agent and multi threading concepts are developed. Finally, the experimental simulation results show clearly the impact of the proposed system for improving the channel allocation performance in generic large scale wireless communication systems.


International Conferences


[C32] P.Papazoglou, A.Moschos

OpenHardSim: An Open Source Hardware Based Simulator for Learning Microprocessors”, IEEE Global Engineering Education Conference (EDUCON 2017), 25-28 April 2017 Athens, Greece

ΜMicroprocessor (uP) Architecture and Programming constitute core courses in computer science and electronic engineering departments. A variety of tools has been used for gaining more knowledge and understanding the basic and advanced concepts of the course. These tools (hardware platforms and simulators) are focused mainly on assembly programming. Despite the existing tools, students still face great learning difficulties. On the other hand, key issues are the corresponding architecture and the programming features of the uP under studying. The above issues are not fully addressed by the existing tools. In this paper, a customizable hardware based uP simulator is presented and final proposed. Using this simulator, an experimental hypothetical educational uP can be built by students and the professors can create the corresponding learning scenarios. Based on the proposed approach, the experimental uP consists of identical hardware based blocks that can be reprogrammed for representing registers, arithmetic and logic unit, etc. Thus, the students can act now as uP architecture and assembly language designers gaining crucial knowledge in the field.



 

[C31] Papazoglou, P.M., Karras, D.A., Papademetriou, R.C.

Dynamic channel assignment algorithms for supporting QoS based services in wireless cellular environments, 23rd Telecommunications Forum, IEEE TELFOR, 2016

The number of users employing multimedia services in cellular networks has been increased dramatically in the last decade. Multimedia services are more demanding compared to traditional voice services in terms of bandwidth availability and integrity. The capacity and the bandwidth reservation on demand according to QoS requirements are key concepts in mobile cellular communications. The available frequency spectrum is limited and the demand for enhanced mobile user facilities is increasing day by day, hence the channels must be reused as much as possible to increase the system capacity. Existing and proposed channel assignment strategies have to be transformed to support efficiently the new demanding multimedia services. Through this paper we present a review of the most known channel assignment strategies, as well as their QoS aspects and we propose new DCA variations and a channel architecture adapted to QoS requirements for supporting multimedia services. We also present some strategies, models and conclusions for algorithm evaluation based on experimental results.

 

[C30] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On Integrating Natural Computing based Optimization with Channel Assignment Mining and Decision Making towards Efficient Spectrum Reuse in Cellular Networks Modelled through Multi Agent System Schemes, Interna-tional Conference on Wireless Communications, Networking and  Applications (WCNA), De-cember, Shenzhen, China, Springer LNEE 2016

Heuristic schemes and algorithms are successfully used for solving optimization problems. A great challenge in large-scale wireless networks is the channel allocation adaptability to dynamic network traffic conditions, which can be formulated as a discrete optimization problem. Several approaches such as genetic algorithms and multi-agent techniques have been applied so far in the literature for solving the resource management problem focusing mainly on network base-stations representation. A very promising intelligent approach known as ant colony optimization (ACO) which constitutes a special form of swarm intelligence has been used for solving routing problems. This approach has been introduced by the authors for improving the channel allocation in large-scale wireless networks, focusing on network procedures as the basic model component and not on network nodes as so far found in the literature. A comprehensive intelligent model architecture based on multi-agent systems technology and ACO for channel allocation in cellular networks is herein analysed and proposed. Moreover, the decision making for channel allocation is presented as well as the network-ant agent communication model. The new methodology for integrating ACO schemes and decision making regarding spectrum reuse in a multi-agent framework, through a novel agent negotiation approach, is the main contribution of this research. Finally, the simulation results show the large-scale wireless network performance improvement in terms of efficient resource management.


 

[C29] P.M.Papazoglou, D.A.Karras

A conceptual Multi-Agent Modeling of Dynamic Scheduling in Wireless Sensor Networks, International Conference on Wireless Communications, Networking and Applications (WCNA), December, Shenzhen, China, Springer LNEE 2016

Wireless Sensor Networks (WSNs) have a plethora of modern applications in our world and are also very promising and suitable for future applications. Critical issues such as clustering, organization, event scheduling (for transmitting and receiving), power consumption, routing, time response, etc., have been studied and analyzed in the literature. It is common knowledge that the most critical issue is the adaptation of the WSN in the real needs and dynamically changing environment. Despite the existing studies, the above issue has not been studied in depth. In a real WSN application the mote role, event scheduling, network clustering, and decision support are changing in a dynamically adapted manner. To this end, in this paper, a novel modeling approach based on the multi-agent technology is presented. Moreover, the proposed approach is focused on scheduling policy for achieving low power consumption.



 

[C28] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On Improved Modeling and Simulation of Wireless Communication Systems using Multiagent and Multi-threading Systems Architectures for efficient spectrum reuse, 22nd Telecommunications Forum, TELFOR 2015, November, Belgrade, Serbia

Efficient design and evaluation of complex wireless communication systems in terms of spectrum reuse can be accomplished using advanced simulation environments. To this goal, network modelling and simulation methodologies are the most critical issues, thus, several Discrete Event Simulation (DES) schemes have been introduced in the literature. In a real wireless network, services such as new call admission, reallocation, etc, should be offered at the same time for different mobile users in the network coverage area. Thus, the network modelling must be based on the network operational concurrency and services independence. The simulation model adaptation to real network behaviour is a challenging goal. Herein, a novel simulation methodology based on multi-threading for simulating wireless networks, compared to the state of the art approach, is presented, preliminarily analyzed and discussed. Moreover, various implementations based on multi-threading and multi-agent concepts are also presented and evaluated.



 

[C27] Panayotis M. Papazoglou, Theoni I. Laskari, George K. Fourlas

Towards a Low Cost Open Architecture Wearable Sensor Network for Health Care Applications, The 7th International Conference on PErvasive Technologies Related to Assistive Environments, Rhodes, Greece, May 2014

Wireless sensor networks present a growing interest in health care applications since they can replace wired devices for detecting signals of physiological origin and continuously monitoring health parameters, offering a reliable and inexpensive solution. In this paper a low cost open architecture wearable sensor network for health care applications is presented. Through this study, an experimental wireless sensor network (WSN) architecture has been built from scratch in order to investigate and present the development procedure and the corresponding capabilities and limitations of such a system. Moreover, technological aspects regarding implementation are also presented.

 

[C26] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

A Simulation Setup Validation Framework for Modeling Architectures and Algorithms in Designing Large Scale Wireless Communication Systems, WSEAS, Recent Advances in Telecommunications and Circuits, ISBN: 978-960-474-308-7, Dubrovnik, Croatia, June 25 - 27, 2013

Channel allocation is one of the fundamental issues in designing wireless communications systems due to the fact that it determines how the available bandwidth will be managed over the changeable user demands. The limited channel capacity and the increasing requirements for advanced services such as real time video grant channel allocation strategies a special role. Plethora of channel allocation strategies have been proposed in the literature for supporting GSM and 3G communication as well as multimedia data services and tested through generic or specific simulation architectures for medium size networks. The problem, however, still remains, that is how reliable are the simulation results attained, compared to the performance of real world
mobile communication systems. In large scale networks, the problem is getting even worse, since generic simulation systems are well adapted to medium scale problems but not to higher complexity systems, where the traffic conditions cannot be predicted. Therefore, some strategies should be involved to investigate the validity of the simulation models implemented in the proposed simulators. This paper, presents a validation framework for such simulation systems based on an architecture involving a hierarchy of several key components in order to manage this important issue. Some initial experimental results are compared favourably to the theoretical ones.



[C25] Panagiotis Papazoglou, Karras Dimitrios, Papademetriou Rallis

Modeling Efficient Dynamic Channel Assignment Schemes for Quality of Service Wireless Multimedia Telecommunications through an extended and integrated Java Simulation Framework International Conference on Future Generation Communication Technology (FGCT 2012) December 12-14, 2012, British Computer Society, London, UK (published in IEEE Xplore)

The increasing number of cellular users and the demand for broadband mobile communications (3rd nd 4th generation) raises the problem of bandwidth availability and the associated channel allocation strategies. Moreover, Quality of Service (QoS) is the challenge for such modern wireless multimedia telecommunications. This paper presents new algorithms for efficient bandwidth management of GSM cellular multimedia systems. Besides, it proposes a comprehensive simulation system for evaluating channel assignment schemes in QoS multimedia cellular systems incorporating their principles, entities and concepts involved. The proposed system is implemented in Java, in order to create an educational generic simulation environment with the future capability of internetworking. The system is designed with the goal to be efficient in simulating large scale generic cellular multimedia telecommunication systems.

 

[C24] Papazoglou, P.M.; Karras, D.A.; Papademetriou, R.C.

Evaluating novel DCA variations for efficient channel assignment in cellular communications through a generic Java simulation system
IEEE International Conference on Computer Science and Network Technology (ICCSNT), pp 438 - 444, 2011, China

In recent years, mobile telephony, computing and services have emerged as an important field of research. The rapid evolution of cellular technology and the augmentative user demand for advanced mobile services leads the industry to develop more efficient network structures. The increasing number of cellular users and the demand for broadband mobile communications (3rd and 4th generation) drives to the research of new methodologies for the design of cellular networks and services. One of the issues in such a design is selection of channel allocation schemes. This paper thoroughly reviews centralized and mainly distributed DCA schemes and presents several new efficient variations suitable for large scale cellular systems. On the other hand, Simulation environments more than ever offer the opportunity to develop and study with low cost new structures and methods for the implementation of new services. To this end, this paper proposes a comprehensive simulation system for evaluating channel assignment schemes incorporating their principles, entities and concepts involved. The proposed system is implemented in Java, in order to create a high performance generic simulation environment with the future capability of internetworking. The system is designed with the goal to be efficient in simulating large scale generic cellular telecommunication systems. Moreover, another goal of the proposed system is to serve as a test bed for the evaluation and development of DCA schemes (especially for educational purposes) involved in such large scale cellular systems towards their planning as effective cellular mobile radio networks.

 

[C23]  A. Filippou, D.A. Karras, P.M. Papazoglou, R.C. Papademetriou

On a Novel Simulation Framework and Scheduling Model Integrating Coverage Mechanisms for Sensor Networks and Handling Concurrency GDC/CA 2010, Springer, 2010

Coverage is one of the fundamental metrics used to quantify the quality of service (QoS) of sensor networks. In general, we use this term to measure the ability of the network to observe and react to the phenomena taking place in the area of interest of the network. In addition, coverage is associated with connectivity and energy consumption, both important aspects in the design process of a Wireless Sensor Network (WSN). On the other hand, simulating a WSN involves taking into account different software and hardware aspects. In this paper we attempt to present a simulation framework suitable for integrating coverage mechanisms in WSN emulation using a layered architecture and a fitting scheduling model. The suggested model is derived after a critical overview and presentation of the coverage strategies as well as the simulation approaches for WSN developed so far. The main advantage of the proposed framework is its capability to handle concurrent events occurring at WSN deployment and operation through the suitable layered scheduler integrated.

 

[C22] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On Cellular Network Channels Data Mining and Decision Making through Ant Colony Optimization and Multi Agent Systems Strategies, Advances in Data Mining. Applications and Theoretical Aspects, LNCS, Springer, 2009

Finding suitable channels to allocate in order to serve increasing user demands in a cellular network, which is a dynamical system, constitute the most important issue in terms of network performance since they define the bandwidth management methodology. In modern cellular networks these strategies become challenging issues especially when advanced services are applied. The effectiveness of decision making for channel allocation in a cellular network is strongly connected to current traffic and wireless environment conditions. Moreover, in large scale environments, network states change dynamically and the network performance prediction is a hard task. In the recent literature, the network adaptation to current real user needs seems it could be achieved through computational intelligence based channel allocation schemes mainly involving genetic algorithms. In this paper, a quite new approach for communication channels decision making, based on ant colony optimization, which is a special form of swarm intelligence, modelled through multi agent methodology is presented. The main novelty of this research lies on modelling this optimization scheme through multi agent systems. The simulation model architecture which includes network and ant agents are also presented as well as the performance results based on the above techniques. Finally, the current study, also, shows that there is a great field of research concerning intelligent techniques modelled through multi-agent methodologies focused on channels decision making and bandwidth management in wireless communication systems.

 

[C21] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On Improved Event Scheduling Mechanisms for Wireless Communications Simulation Modelling, IEEE International Conference on New Technologies, Mobility and Security, 2008, TANGIER, MOROCCO

An improved simulation model is presented in this paper for modeling resource allocation strategies in wireless communications based on new event scheduling mechanisms involving real time systems methodologies. Such mechanisms are more suitable than the currently utilized Calendar Queue algorithm for simulating concurrent events in cellular networks. The proposed simulation model is based on a novel real time event scheduling algorithm extending the known in Discrete Event Simulation methodology, Calendar Queue algorithm. The new algorithm is analyzed and its implementation issues involving multithreading technology are discussed. The application of the new scheme in modeling GSM cellular networks shows significant enhancements with regards to network modeling performance compared to rival simulation modeling techniques.

 

[C20] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On the Implementation of Ant Colony Optimization Scheme for Improved Channel Allocation in Wireless Communications, IEEE International Conference on Intelligent Systems, 2008

Channel allocation in wireless communication systems is one of the fundamental issues. The corresponding allocation schemes can not be static due to the dynamically changing traffic conditions and network performance. Thus, more sophisticated strategies adapted to current network conditions must be investigated and applied. Recently, various approaches have been proposed for channel allocation based on intelligent techniques such as multi-agent technology and genetic algorithms. These approaches constitute heuristic solutions to resource management problem. On the other hand, the ant colony optimization approach has been proposed for solving optimization problems but this approach has not been proposed so far for solving the channel allocation problem in wireless communication systems. In this paper, a comprehensive heuristic approach for solving the channel
allocation problem based on intelligent techniques such as multi-agents and ant colony optimization is proposed. Moreover, important implementation issues such as thread execution sequence are also presented. Finally, the simulation results show the performance improvement of the proposed ant colony optimization algorithm as well as the multi-agent modeling approach.

 

[C19] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

A Multi-agent Simulation Model for Wireless Communications involving an improved agent negotiation scheme based on real time event scheduling mechanisms, IEEE European Modelling Symposium, EMS 2008

An improved multi-agent simulation model is presented in this paper for modeling resource allocation strategies in wireless communications. It is based on a novel agent negotiation methodology based on real time event scheduling extending Calendar
Queue algorithm. The application of the new scheme in modeling GSM cellular networks shows significant enhancements with regards to network modeling performance compared to rival simulation modeling techniques.

 

[C18] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On the Multi-Threading Approach of Efficient Multi-Agent Methodology for Modelling Cellular Communications Bandwidth Management, 2nd KES Symposium on Agent and Multi-Agent Systems, Springer LNCS proceedings, Korea, 2008

There are very few studies using the multi agent concept as an alternative and efficient approach for bandwidth management. The goal of the paper is to propose a novel modelling methodology of wireless network services exploiting multi-agent technology and investigating in depth critical implementation issues of multi-threading techniques focused on network agents. Moreover, it is claimed that an advanced negotiation scheme between network service agents can lead to better model network performance. Thus, the multi agent concept seems a suitable solution for modelling and implementing cellular services simulation. The proposed agent based modelling as well as the proposed implementation methodology of the wireless services are herein presented in three levels; (a) multi agent modelling of the wireless services, (b) developing an advanced negotiation scheme based on current status and curve statistics of network performance and (c) investigating critical multi threading based implementation issues of the suggested multi agent modelling. Finally, simulation results show the effectiveness of the proposed multi agent approach as well as of the proposed negotiation scheme based on blocking and dropping probability curve statistics.

 

[C17] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

A Critical Overview on the Recent Advances in Channel Allocation Strategies for Voice and Multimedia Services in Wireless Communication Systems and the Applicability of Computational Intelligence Techniques, Proceedings of the 10th WSEAS International Conference on MATHEMATICAL METHODS, COMPUTATIONAL TECHNIQUES and INTELLIGENT SYSTEMS (MAMECTIS '08)


Channel allocation is one of the fundamental issues in wireless communications due to the fact that it determines how the available bandwidth will be managed. The limited channel availability and the increasing demands for advanced services such as real time video give to channel allocation strategies a special role. Plethora of channel allocation strategies have been proposed in the literature for supporting voice services as well as multimedia services. In large scale networks, where the traffic conditions can not be predicted, intelligent techniques have been applied such as genetic algorithms. This paper, presents a critical overview on the recent advances in the most important channel allocation strategies found in the literature with regards to voice and multimedia services. Moreover, a discussion for the existing channel allocation strategies and the applicability of intelligent techniques, based on the computational intelligence framework, is also presented.

 

[C16] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

On Integrated Ant Colony Optimization Strategies for Improved Channel Allocation in Large Scale Wireless Communications, Proceedings of the 10th WSEAS International Conference on MATHEMATICAL METHODS, COMPUTATIONAL TECHNIQUES and INTELLIGENT SYSTEMS (MAMECTIS '08)

Recently, various sophisticated strategies adapted to current network conditions have been proposed for channel allocation based on intelligent techniques such as evolutionary and genetic algorithms. These approaches constitute heuristic solutions to resource management problems in modern cellular systems. On the other hand, the ant colony optimization approach has been proposed for solving several optimization problems with promising results. It would be interesting, therefore, to investigate its application in resource management problems of wireless systems. A comprehensive and efficient heuristic approach for solving the channel allocation problem in large scale wireless communication systems, based on intelligent techniques and especially on integrating multi-agent methodology and ant colony optimization strategies, is herein proposed. Moreover, important implementation issues of ant colony optimization within a multi-agent simulation system are investigated. In addition, multi-agent realization issues such as thread execution sequence definition are also presented. An initial but comprehensive simulation study has been conducted and the simulation results show the performance improvement of the proposed ant colony optimization algorithm as well as the multi-agent modelling approach with respect to traditional network performance statistics.

 

[C15] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Concurrent Events Scheduling for Efficient Simulation Modelling of Large Scale Cellular Networks Based on Multitasking Real Time Scheduling Techniques and Analysis,12th WSEAS Int. Conf. on COMMUNICATIONS, 2008

Simulation environments constitute efficient tools for designing and evaluating wireless cellular networks. These environments consist of various critical components such as the simulation model, the modelled services and the simulation model architecture. The real network events such as new call admission and handoff are simulated by corresponding specialized mechanisms which generate and schedule events in later time respectively. The most critical component is the event scheduling mechanism which reflects network events as they happen in a real network. The state of the art event scheduling mechanism called Calendar Queue schedules events for later execution based on the corresponding time stamps of each generated event. The major drawback of this approach is that the generated events are executed only sequentially due to progressive time stamps. On the other hand, events in a real wireless network happen concurrently and so the state of the art mechanism can not reflect these conditions. Through this paper, an alternative novel real time scheduling mechanism is proposed and preliminarily analyzed which faces effectively the concurrent nature of the generated network events providing an efficient solution to the Calendar Queue problem. Finally, simulation results show that the proposed scheduling mechanism performs better as compared to the state of the art approach.

 

[C14] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Modeling DCA Strategies for Supporting Multimedia Services with QoS over Cellular Communication Systems, 12th WSEAS Int. Conf. on COMMUNICATIONS, 2008

The increasing demand for advanced services in cellular networks such as data and video raises the problem of efficient bandwidth management in terms of channel availability. Many algorithms for supporting advanced services have been presented in the literature based mainly on bandwidth reservation and capacity management. In this paper, novel dynamic channel assignment strategies for supporting data (e.g. file transfer) and video (video viewing, video conference) with Quality of Service (QoS), and their evaluation through a prototype advanced statistical simulation environment for cellular communications are presented. Moreover, we analyze the dynamic and distributed channel allocation of data and video channels based on signal purity measures. Finally, the performance of the proposed algorithms evaluated through a prototype simulation environment is discussed.

 

[C13] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Multi-threading as a tool for efficient simulation of Wireless Communication Systems, IEEE, Eurocon 2007, Computer as a tool

Cellular communication systems now more than ever play a major role in the technological evolution. Every day activities are based on everywhere communication capabilities. Wireless technology offers a variety of services such voice, data and video to any mobile user. New communication standards for service quality have been established due to increasing user demands. Computer and programming technology constitute imperative tools for developing simulation environments. Through simulation environments, a cellular communication system can be designed and its behavior can be predicted. The rapid change of this technology led to the development of more sophisticated simulation environments for designing and evaluating modern communication systems that support efficiently advanced services. In this paper, the application of modern computer and programming technology for efficient design and simulation of cellular communication systems is presented. Moreover, a novel methodology for efficient modeling and simulation of wireless systems using the multi-threading technology is also presented and evaluated.

 

[C12] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

A Multi-Agent Architecture for Designing and Simulating Large Scale Wireless Systems Resource Allocation, 1st KES Symposium on Agent and Multi-Agent Systems, Springer LNAI proceedings, Poland 2007

The simulation model adaptability to real network behavior is the key concept in wireless communications. In a cellular network, many procedures such as call admission, hand-off, etc take place simultaneously for every individual user. Every network procedure acts autonomously, interacts with the network environment (gathers information such as interference conditions), takes decisions (e.g. call establishment), etc. Although this is known in the literature, there is lack of suitable representations for such network procedures in the simulation systems proposed so far, thus compromising simulation model adaptability to real network behavior. To achieve such adaptability we herein propose to change the point of view in network procedure representation. Instead of viewing them as independent programming functions or even objects in a high level language, which are sequentially executed, due to their aforementioned properties it is proposed that such network procedures could be more efficiently modeled as agents. Considering this new approach, the agent cooperation and communication in terms of negotiation and agreement is a critical issue. In this paper we present a centralized cooperative multi-agent negotiation scheme applied to a multi-agent layered architecture for designing and simulating resource allocation in cellular communication systems, based on organizational modeling. Moreover, we show the way that the rules and implementation methods of agent negotiation affect the adaptation grade of simulation model to the real cellular network behavior.

 

[C11] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

A PRELIMINARY ANALYSIS OF MULTI-AGENT AND MULTI-THREADING TECHNOLOGIES FOR EFFICIENT MODELLING AND SIMULATION OF WIRELESS COMMUNICATION SYSTEMS, 2nd International Conference on Experiments/ Process/ System Modelling/Simulation & Optimization, 2nd IC-EpsMsO, 2007, Athens

Efficient design and evaluation of complex wireless communication systems can be accomplished using advanced simulation environments. In such an environment, the network modelling and simulation methodologies are the most critical issues. Discrete event simulation constitutes the most popular approach for the whole simulation procedure. Several models and implementations for simulation of wireless communication systems have been introduced in the literature. In a real wireless network (e.g. cellular), services such as new call admission, reallocation, etc, are offered at the same time for different mobile users in different locations
among the network coverage area. Thus, the network modelling within the simulation environment must be based on the network operational concurrency and services independence. The simulation model adaptation to the real network behaviour is a challenging goal and can be achieved by choosing the right modelling methodology and implementation strategy. In this paper, a novel simulation methodology based on multithreading technology for simulating wireless networks, compared to the state of the art approach, is presented, preliminarily analyzed and discussed. Moreover, various implementations based on multi-threading and multiagent concepts are also presented and evaluated.

 

[C10] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Simulating and Evaluating Dynamic Channel Assignment Schemes in Wireless Communication Networks through an Improved Multi-Agent System, 3rd Indian International Conference on Artificial Intelligence (IICAI-07), 2007

The efficient design and implementation of advanced wireless networks is based mainly on the capabilities of the available simulation environments. Towards a reliable simulation, the developing and modelling methodology is a critical issue. Thus, high adaptability of the simulation model to the real network behaviour is a major goal. In a real wireless network (e.g. cellular), call admission, hand-off, call termination and user movement procedures take place at the same time for every individual user. Every network procedure acts autonomously, interacts with the network environment, takes decisions, etc. Due to that fact each network procedure can be faced as an agent inside a concurrent environment. Regarding this approach, the agent cooperation and communication is a critical issue too. A centralized multi-agent negotiation scheme based on a multi-agent layered concurrent architecture for designing and evaluating channel allocation strategies is herein presented along with the dependency of the simulation results on the rules and implementation methods of agent negotiation schemes.

 

[C9] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Efficient Simulation Methodologies for Wireless Multimedia Communication Systems, HERCMA 2007, September 2007,Athens, Greece, Athens University of Economics & Business

The goal of this paper is to investigate suitable scheduling schemes for discrete event simulation methodologies applied to wireless communication systems. Complex wireless networks can be designed and evaluated through a proper simulation methodology which represents accurately the real network behaviour. The modelling of physical network components (e,g, Base Stations) and services (e.g. new call admission) as simulation entities as well as the simulation methodologies characteristics for representing the life cycle of a physical activity (e.g. progress of a call) play a major role in the simulation system reliability. The most widely known simulation technology is the Discrete Event Simulation [1-7] (DES). In DES, events are happening in discrete points in time and after an event life cycle completion, a mechanism advances simulation time. The physical time of network activities (events) occurrence is represented, within the simulation environment, with a statistical event generation procedure and a special mechanism called scheduler that defines when each event takes place in simulation time until simulation completion.

 

[C8] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Improved Simulation System Performance for Wireless Communications using Efficient Multi-Threading Architectures, 11th WSEAS Int. Conf. on COMMUNICATIONS, 2007

Simulation systems play a major role in the design and evaluation of any experimental wireless network. The goal of this paper is to demonstrate that simulation model architectures affect simulation behavior, concerning network performance metrics, essentially and therefore, the optimal architecture should be investigated in order to achieve the most accurate and reliable results. It is found that the most critical components that determine simulation model performance are simulation time, network event scheduling and grade of concurrency. It is, also, found that simulation time in relation to event occurrence in the real network
along with the usage of modern architectural concepts such as multi-threading technology constitute critical issues too in the development of an efficient simulation system for wireless communications. In order to evaluate the above findings an extensive experimental study has been conducted testing several discrete event simulation systems towards presenting the relation between thread modeling selections, simulation time and network performance.

 

[C7] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Evaluating new efficient DCA schemes through a Generic Simulation System for large scale GSM cellular telecommunications, The 15th IASTED International Conference on APPLIED SIMULATION AND MODELLING, June 26-28, 2006, Rhodes, Greece, ISBN 0-88986-559-0

The increasing number of cellular users and the demand for broadband mobile communications (3rd and 4th generation) drives to the research of new methodologies for the design and evaluation of cellular networks and services. Simulation environments more than ever offer the opportunity to develop and study with low cost new structures and methods, including channel assignment schemes, for the implementation of new services. This paper thoroughly reviews centralized and distributed DCA schemes for GSM cellular systems in terms of simulation characteristics and needs and proposes a comprehensive simulation system incorporating their principles, entities and concepts involved. Moreover it proposes new efficient balanced DCA schemes minimizing cell congestion, leading to superior performance over rival assignment techniques. The proposed system is implemented in Java, in order to create a high performance generic simulation environment with the future capability of internetworking. The system is designed with the goal to be efficient in simulating large scale generic GSM cellular telecommunication systems in contrast to the majority of literature works where ad-hoc small cellular systems are presented. Moreover, another goal of the proposed system is to serve as a test bed for the evaluation and development of DCA schemes (especially for web based educational purposes) involved in such large scale cellular systems towards their planning as effective cellular mobile radio networks.

 

[C6] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

Novel DCA algorithms for efficient Channel Assignment in Cellular Communications and their evaluation through a generic Java Simulation System, 6th WSEAS Int. Conf. on SIMULATION, MODELLING AND OPTIMIZATION (SMO '2006)

In recent years, mobile telephony, computing and services have emerged as an important field of research. The rapid evolution of cellular technology and the augmentative user demand for advanced mobile services leads the industry to develop more efficient network structures. The increasing number of cellular users and the demand for broadband mobile communications (3rd and 4th generation) drives to the research of new methodologies for the design of cellular networks and services. One of the issues in such a design is selection of channel allocation schemes. This paper thoroughly reviews centralized and mainly distributed DCA schemes and presents several new efficient variations suitable for large scale cellular systems. On the other hand, Simulation environments more than ever offer the opportunity to develop and study with low cost new structures and methods for the implementation of new services. To this end, this paper proposes a comprehensive simulation system for evaluating channel assignment schemes incorporating their principles, entities and concepts involved.

 

[C5] P.M.Papazoglou, D.A.Karras, R.C.Papademetriou

A dynamic channel assignment simulation system for large scale cellular telecommunications, HERCMA 2005, September 2005,Athens, Greece, ISBN 960-87275-8-8, Athens University of Economics & Business

The rapid evolution of cellular technology and the augmentative user demand for advanced mobile services leads the industry to develop more efficient network structures. The increasing number of cellular users and the demand for broadband mobile communications (3rd and 4th generation) drives to the research of new methodologies for the design of cellular networks and services. Simulation environments more than ever offer the opportunity to develop and study with low cost new structures and methods for the implementation of new services. This paper thoroughly reviews centralized and distributed DCA schemes in terms of simulation characteristics and needs and proposes a comprehensive simulation system incorporating their principles, entities and concepts involved. The proposed system is implemented in Java, in order to create a high performance generic simulation environment with the future capability of internetworking. The system is designed with the goal to be efficient in simulating large scale generic cellular telecommunication systems. Moreover, another goal of the proposed system is to serve as a test bed for the evaluation and development of DCA schemes (especially for educational purposes) involved in such large scale cellular systems towards their planning as effective cellular mobile radio networks.

 

[C4] P.M.Papazoglou, D.A.Karras, A.C.Tsakiri

The challenges of Wireless Communications in Developing a Virtual University, 1st International Scientific Conference eRA, 2006

The e-learning concept exists for many years but only lately applied successfully due to technology evolution. The distance learning courses became true when the communication technology reached an acceptable level of services. The user demand for advanced services such as video telephony, file transfer and real time multimedia communication, supports the idea of the virtual University which offers full educational services to moving users via wireless access. Due to the needed advanced services the efficient bandwidth management is a major issue. The technology of mobile cellular networks constitutes a guide for implementing and offering advanced mobile multimedia services. Through this paper we present the trends of e-learning in higher education in combination with the technical challenges in the area of wireless communications (specifically in cellular networks) such as channel allocation strategies for implementing the needed services.

 

[C3] A.Nioras, Th.Loukopoulos, K.Antonis, D.Prentzas, P.Papazoglou, P.Lampas, S.Karkanis

Application of a Hybrid Method in Distance Education with the Use of the Blackboard Tool, Conference on Open and Distance Learning ‘Applications of Pedagogy and Technology’, ICODL, HOU November 2005, Patra

In this paper we present a hybrid pedagogical method for distance learning in Computer Science courses, which is based on the combination of the Problem Based Learning (PBL) and the Collaborative Learning methods. This method has been adopted in the context of the “Enhancement of Computer Science studies in the Technological Educational Institute of Lamia” project and it will be applied for the conduction of distance learning courses. The distance learning process will mainly rely on the Blackboard commercial suite.

 

[C2] P.M.Papazoglou, D.A.Karras

Towards an e-Learning system development for Technological Higher Education in Greece, 2nd International Scientific Conference on Information Technology and Quality, June 2005, Spetses, Greece

Many approaches for e-learning environments in education have been developed. Various methods have been tested and applied in different education levels. What are the student’s beliefs for e-learning? Do they have the appropriate hardware for accessing the e-learning system? Do they have any relevant experience? Do they believe that new technologies can replace the traditional educational methods? This paper presents how several factors related to student’s beliefs hindered an e-Learning system at technological higher education in Greece and particularly at the Department of Informatics & Computer Technology of Technological Educational Institute of Lamia, Greece. The research was conducted using questionnaires from 1st to 7th semester. The statistical results of the questionnaires are discussed and some thoughts for the development of an e-learning system are concluded.

 

[C1] P.Papazoglou, D.Karras, I.Stavrakas

The contribution of e-Learning aspects in Technological Higher education in Greece, WSEAS International Conference on ENGINEERING EDUCATION, July 2005, Athens, Greece, ISBN 960-8457-28-9,pp.295-299

The development of an e-learning system is a very complex procedure. The design in order to be complete must also be based οn students’ needs and their beliefs about e-learning according to their previous experience in relevant fields, etc. The main questions that have to be answered initially are their adaptability to on-line courses and how they judge software tools. This paper presents some important aspects of students’ beliefs and experience in the field of e-learning. The whole research was conducted in two different Greek Technological Institutes; at the Department of Electronics (DE) and the Department of Informatics & Computer Technology (DI) located in the city of Athens and of Lamia respectively. Through this paper we attempt to explore the similarities and differences between students’ beliefs in the two departments and other important aspects of their attitude towards e-learning. The statistical analysis and results of more than 500 questionnaires are discussed and some preliminary outcomes for the development of an e-learning system are concluded.

 

Greek Conferences
 

[GC4] Α.Νιώρας, Θ.Λουκόπουλος, Σ.Καρκάνης, Δ.Πρέντζας, Π.Παπάζογλου, Υβριδικές Μαθησιακές Μέθοδοι στην Εξ’ αποστάσεως Δια Βίου Εκπαίδευση Πανελλήνιο Επιστημονικό Συνέδριο Νέες Τεχνολογίες στη Δια Βίου Μάθηση, ΛΑΜΙΑ, 16-17 Απριλίου 2005

Στην εργασία αυτή αναλύονται ξεχωριστά δύο νέες σε εφαρμογή μέθοδοι, η προβληματοκεντρική (Problem Based Learning PBL) και η συνεργατική (Collaborative Learning CL) και προτείνεται μία υβριδική μέθοδος βασισμένη στο προβληματοκεντρικό και το συνεργατικό μοντέλο, με ιδιαίτερη έμφαση στο πρώτο. Μέσα από παραδείγματα, συγκρίσεις και αξιολογικές κρίσεις καταδεικνύονται τα οφέλη από την προσέγγισή ενώ προτείνονται κατευθύνσεις για μελλοντική έρευνα.

 

[GC3] Π.Μ.Παπάζογλου, Μ.Κ. Τριαντόπουλος, Μ.Φ. Χουσαλάς

Ηλεκτρονική εκπαίδευση: Ανάπτυξη ευέλικτου λογισμικού ανοιχτού κώδικα για ηλεκτρονικές εξετάσεις, αξιολόγηση και εγγραφές, Πανελλήνιο Επιστημονικό Συνέδριο Νέες Τεχνολογίες στη Δια Βίου Μάθηση, ΛΑΜΙΑ, 16-17 Απριλίου 2005

Η εργασία παρουσιάζει μια προσπάθεια που είχε ξεκινήσει στο ΤΕΙ Λαμίας και ειδικότερα στο τμήμα Πληροφορικής & Τεχνολογίας Υπολογιστών και αφορά στην ανάπτυξη εκπαιδευτικού λογισμικού για ηλεκτρονικές εξετάσεις, εγγραφές και αξιολόγηση το οποίο θα συγκεντρώνει τέτοια χαρακτηριστικά ώστε να μπορεί να αναπτύσσεται εύκολα καθώς και να υποστηρίζεται και να αξιοποιείται άμεσα από τους εκπαιδευτικούς.

 

[GC2] Π.Παπάζογλου, Γ.Χλούπης, Ι.Χριστάκης

Σύστημα τακτικής μέτρησης και μετάδοσης κλιματολογικών δεδομένων (χαμηλού κόστους) μέσω Internet, 2ο Εθνικό Συνέδριο Τεχνολογίες Αρχιπελάγους Απρ. 2002, Αθήνα

Η συγκεκριμένη εργασία, παρουσιάζει τον τρόπο υλοποίησης και λειτουργίας ενός ολοκληρωμένου συστήματος που μετρά συνθήκες περιβάλλοντος (ταχύτητα ανέμου, ηλιοφάνεια, θερμοκρασία, υγρασία, κατεύθυνση ανέμου) και τις παρουσιάζει για κάθε ενδιαφερόμενο μέσω internet. Το σύστημα αυτό, προορίζεται να λειτουργήσει κυρίως στη νησιωτική Ελλάδα παρέχοντας στο κοινό ενδιαφέρουσες πληροφορίες για κοινά κλιματολογικά δεδομένα που μπορεί να επηρεάσουν τις μετακινήσεις του. Πιο συγκεκριμένα, γίνεται η περιγραφή της δομής του συστήματος, του τρόπου μετάδοσης των δεδομένων, των προδιαγραφών του και του κόστους του. Επίσης, γίνεται αναφορά στην επεκτασιμότητα του συστήματος.

 

[GC1] Π.Παπάζογλου

Εποπτεία και έλεγχος διατάξεων και χώρου μέσω Internet (ή άλλου τύπου δικτύου), 3ο Εθνικό Συνέδριο “Τεχνολογία και Αυτοματισμός” Οκτ. 2000, Αθήνα, vol.V No1 2000 1SSN-1106-4110, pp. 343-348

Η συγκεκριμένη εργασία, παρουσιάζει τον τρόπο υλοποίησης ενός ολοκληρωμένου συστήματος το οποίο επιτρέπει την εποπτεία και τον έλεγχο από οποιαδήποτε απόσταση μιας διάταξης ή ενός χώρου μέσω internet ή γενικά μέσω δικτύου. Ποιο συγκεκριμένα, γίνεται περιγραφή, της δομής του απαιτούμενου Server (ο οποίος βασίζεται σε UNIX/Linux), του τρόπου λειτουργίας του αντίστοιχου λογισμικού, της τεχνολογίας διασύνδεσης με το δίκτυο, της δομής και του τρόπου ελέγχου μέσω του Web Client και το σύστημα του μικροελεγκτή. Επίσης, γίνεται γενική παρουσίαση μερικών χρήσιμων εφαρμογών όπως παρακολούθηση μετρήσεων από απόσταση, κλπ.