ABSTRACT The paper analyses the problem of Medium Access Control in a Passive Optical Network, us... more ABSTRACT The paper analyses the problem of Medium Access Control in a Passive Optical Network, used to concentrate ATM user traffic. Feasible solutions for the problem are investigated and two protocols to resolve contention on the shared medium are presented, the single cell and the multiple cell frame based. The performance of the two protocols is evaluated, obtaining indications about the transfer delay introduced by the protocols and the amount of buffering needed at the user side.
The evolution of wireless networks has motivated the expansion of the static business environment... more The evolution of wireless networks has motivated the expansion of the static business environment to a mobile and wireless one. However, current and forthcoming wireless technologies are characterized by different attributes, regarding coverage area, offered bandwidth and delay. The transparent conjunction of various wireless technologies into a single mobile terminal can further boost the wireless explosion. This paper presents the
Modern communication environments tend to be complex, dynamic and highly distributed. For the pro... more Modern communication environments tend to be complex, dynamic and highly distributed. For the provision of messaging in such environments multiple entities, providing different functionalities and located remotely from each other, must cooperate in order to perform different tasks and provide different kind of information for the completion of the service provision lifecycle. Within this paper we present an implementation analysis of the communication mechanism which was employed in a distributed brokerage framework for the provision of context aware personalized services. The paper focuses on the inter-broker communication mechanism which enables the transparent interaction between components located in different brokers. The mechanism was designed and implemented having in mind relevant requirements such as transparency, modularity and high availability. The design and implementation was based on web service practices and the SOAP protocol.
... NUS, Singapore H. Hanarran, University of the Witwatersrand, South Africa S. Honiden, NII, Ja... more ... NUS, Singapore H. Hanarran, University of the Witwatersrand, South Africa S. Honiden, NII, Japan E. Horlait, LIP6, France A. Iwasaki, NTT Labs, Japan C. Jedrzejek, PUT, Poznan ... 316 Challenges in Modelling and Using Quality of Context (QoC) Michael Krause, Iris Hochstatter ...
Beam forming systems using adaptive array antennas are a viable solution to a number of problems ... more Beam forming systems using adaptive array antennas are a viable solution to a number of problems in applications related to mobile communications. Genetic Algorithms and Particle Swarm Optimization have been extensively used in electromagnetic optimization and antenna design problems. In this paper two smart antennas are investigated, with the purpose to determine the appropriate configuration for each element of the array. The directional patterns of the antenna arrays vary as well as the corresponding geometry; a linear array, composed of 16 elements, for a base station application and a planar uniform circular array (PUCA) composed of 18 radiators. The synthesis problem addressed is to find spatial and feeding configuration of the radiators that conform to certain design constraints. Synchronous GA and PSO algorithms have been utilized to perform beam array optimization for the smart antenna systems. Their efficiency is evaluated on the basis of convergence to the optimal solutio...
EM modeling of the Instrument Localizer System and other guidance systems is an absolute requirem... more EM modeling of the Instrument Localizer System and other guidance systems is an absolute requirement for EMC calculations in the airport environment. This paper presents a series of antenna array power synthesis techniques that are applicable to the ILS Localizer module. System identification and optimization methods used include Least Squares Error Method, Conjugate Gradient and Particle Swarm Optimization. Design criteria imposed are based on pointmatching of the radiation patterns. These methods are finally evaluated based on their performance and parameterization.
this paper that the true potential of the IN concept can be more easily exploited by these techno... more this paper that the true potential of the IN concept can be more easily exploited by these technologies than it can by legacy, "static" software
An architecture enhancing the Intelligent Network to a Distributed IN is described. To this end, ... more An architecture enhancing the Intelligent Network to a Distributed IN is described. To this end, Distributed Processing Environment and Mobile Agent technologies have been employed. The added value, in the context of flexibility and manageability of the exertion of the aforementioned technologies, as well as the extent to which they can be utilized are discussed.
This paper shows a possible path for the introduction of Mobile Service agents within an advanced... more This paper shows a possible path for the introduction of Mobile Service agents within an advanced Broadband Intelligent Network environment. The potential benefits of Distributed Object Technology and Mobile Agents Technology are described and the overall architecture is defined. Then some multimedia services and personal mobility service features are introduced in order to show the wide spectrum of Telecommunication services that can exploit this architecture.
This paper identifies issues related to the service design process in an advanced distributed Int... more This paper identifies issues related to the service design process in an advanced distributed Intelligent Network environment. Starting from the fundamental definition of the Intelligent Network Conceptual Model (INCM) it highlights its basic, intrinsic properties and underlying assumptions. In an effort to enhance the traditional IN architecture with distributed, object oriented features, it identifies areas of the IN where Mobile Agent and Distributed Object Technology concepts can be readily introduced. Furthermore it presents the way in which issues arising from that introduction manifest themselves, their interrelations and the potential design pitfalls they can lead to. The paper proposes a set of implementation principles for service design and identifies their implication on the overall system architecture but also to the service creation process itself. The paper then goes on to describe a service creation process that takes into consideration the introduction of novel soft...
The Intelligent Network (IN) architecture represents a very good solution to the problem of servi... more The Intelligent Network (IN) architecture represents a very good solution to the problem of service offering in the telecommunications environment, since it decouples switching and call control functionality from the service related one. However, its rigid centralised architecture has intrinsic bottlenecks, which could harm its performance, and traditional approach to service design and deployment limits the possibility to introduce new services efficiently. This paper examines the benefits given to IN by the adoption of Distributed Object and Mobile Agent Technologies, and reports the approach of the ACTS MARINE (Mobile Agent enviRonments in Intelligent Networks) project.
The Intelligent Broadband Network (IBN) enables efficient provision of advanced multimedia servic... more The Intelligent Broadband Network (IBN) enables efficient provision of advanced multimedia services to users, exploiting the benefits of the ATM technology and hiding the limitations of current signalling systems to IBN service designers. The availability of technologies like DOT (Distributed Object Technology) and MAT (Mobile Agent Technology) opens new horizons towards the Distributed Intelligent Networks (DIN). Among the main issues that need to be addressed, in the area of the DIN, are the deployment, provision and control of advanced services. The potentials originating from the utilisation of DOT and MAT along with the employment of concepts and ideas coming from the object oriented design patterns community provide the basis for enhancements in the service design and creation process. This paper introduces a set of implementation principles for the service creation, deployment and management and shows their implications on the overall system architecture. We argue that with t...
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2012
ABSTRACT Remote monitoring is considered one key factor towards the improvement of elderly people... more ABSTRACT Remote monitoring is considered one key factor towards the improvement of elderly people’s quality of life and the reduction of healthcare costs. This paper discusses the prevailing network and software architectural principles in this sector and presents the way that they are applied into the inCASA platform. We emphasize on how services could be offered in a standard and re-usable way on top of the underlying physical layers. The aim is to apply Service Oriented Architecture (SOA) in a healthcare-based Internet of Things (IoT) environment. This approach supports a combined telecare and telehealth solution for monitoring of frail elderly people.
Remote healthcare monitoring has attracted the interest of many research projects during last yea... more Remote healthcare monitoring has attracted the interest of many research projects during last years. The need to address the issue of ageing population has lead to the exploitation of modern communication and software technologies in this domain too. This is instigated by related technological evolutions such as the evolutions in sensor networks which can now support self organization. This paper presents the INCASA architecture that provides advances towards mainly two directions. To start with, by using the appropriate middleware, it manages to transform the network of devices to a network of services following a Service Oriented Architecture. In this way, it turns the implementation of applications (e.g. clinical applications) on top of the middleware to be easy and efficient. Furthermore, INCASA architecture provides an integrated solution for profiling user habits. This is particularly important in case of elderly people who tend to follow daily activities in a repeating manner...
Fast Healthcare Interoperability Resources (FHIR) is considered to be an emerging Health Level 7 ... more Fast Healthcare Interoperability Resources (FHIR) is considered to be an emerging Health Level 7 (HL7) standard that takes advantage of the positive elements of its ancestors HL7 v2 and HL7 v3. Moreover, FHIR is based on the REST architectural style, thus being suitable for lightweight devices. This paper presents the AidIT mobile application aiming at the effective management of patients' electronic personal health records via an easy to use interface which can be accessed by multiple actors, namely the patient, the doctor and the pharmacist. We discuss the implementation benefits of using FHIR in order to integrate the mobile client and the application's server side and we also provide insights into the access control mechanisms that should govern such applications.
Abstract This paper describes an ICT platform aiming to support the well-being of frail elderly p... more Abstract This paper describes an ICT platform aiming to support the well-being of frail elderly people and facilitate them to stay longer and more healthily in their own home. Its principal characteristic is the combination of Telehealth and Telecare monitoring in a unified way, ...
ABSTRACT The paper analyses the problem of Medium Access Control in a Passive Optical Network, us... more ABSTRACT The paper analyses the problem of Medium Access Control in a Passive Optical Network, used to concentrate ATM user traffic. Feasible solutions for the problem are investigated and two protocols to resolve contention on the shared medium are presented, the single cell and the multiple cell frame based. The performance of the two protocols is evaluated, obtaining indications about the transfer delay introduced by the protocols and the amount of buffering needed at the user side.
The evolution of wireless networks has motivated the expansion of the static business environment... more The evolution of wireless networks has motivated the expansion of the static business environment to a mobile and wireless one. However, current and forthcoming wireless technologies are characterized by different attributes, regarding coverage area, offered bandwidth and delay. The transparent conjunction of various wireless technologies into a single mobile terminal can further boost the wireless explosion. This paper presents the
Modern communication environments tend to be complex, dynamic and highly distributed. For the pro... more Modern communication environments tend to be complex, dynamic and highly distributed. For the provision of messaging in such environments multiple entities, providing different functionalities and located remotely from each other, must cooperate in order to perform different tasks and provide different kind of information for the completion of the service provision lifecycle. Within this paper we present an implementation analysis of the communication mechanism which was employed in a distributed brokerage framework for the provision of context aware personalized services. The paper focuses on the inter-broker communication mechanism which enables the transparent interaction between components located in different brokers. The mechanism was designed and implemented having in mind relevant requirements such as transparency, modularity and high availability. The design and implementation was based on web service practices and the SOAP protocol.
... NUS, Singapore H. Hanarran, University of the Witwatersrand, South Africa S. Honiden, NII, Ja... more ... NUS, Singapore H. Hanarran, University of the Witwatersrand, South Africa S. Honiden, NII, Japan E. Horlait, LIP6, France A. Iwasaki, NTT Labs, Japan C. Jedrzejek, PUT, Poznan ... 316 Challenges in Modelling and Using Quality of Context (QoC) Michael Krause, Iris Hochstatter ...
Beam forming systems using adaptive array antennas are a viable solution to a number of problems ... more Beam forming systems using adaptive array antennas are a viable solution to a number of problems in applications related to mobile communications. Genetic Algorithms and Particle Swarm Optimization have been extensively used in electromagnetic optimization and antenna design problems. In this paper two smart antennas are investigated, with the purpose to determine the appropriate configuration for each element of the array. The directional patterns of the antenna arrays vary as well as the corresponding geometry; a linear array, composed of 16 elements, for a base station application and a planar uniform circular array (PUCA) composed of 18 radiators. The synthesis problem addressed is to find spatial and feeding configuration of the radiators that conform to certain design constraints. Synchronous GA and PSO algorithms have been utilized to perform beam array optimization for the smart antenna systems. Their efficiency is evaluated on the basis of convergence to the optimal solutio...
EM modeling of the Instrument Localizer System and other guidance systems is an absolute requirem... more EM modeling of the Instrument Localizer System and other guidance systems is an absolute requirement for EMC calculations in the airport environment. This paper presents a series of antenna array power synthesis techniques that are applicable to the ILS Localizer module. System identification and optimization methods used include Least Squares Error Method, Conjugate Gradient and Particle Swarm Optimization. Design criteria imposed are based on pointmatching of the radiation patterns. These methods are finally evaluated based on their performance and parameterization.
this paper that the true potential of the IN concept can be more easily exploited by these techno... more this paper that the true potential of the IN concept can be more easily exploited by these technologies than it can by legacy, "static" software
An architecture enhancing the Intelligent Network to a Distributed IN is described. To this end, ... more An architecture enhancing the Intelligent Network to a Distributed IN is described. To this end, Distributed Processing Environment and Mobile Agent technologies have been employed. The added value, in the context of flexibility and manageability of the exertion of the aforementioned technologies, as well as the extent to which they can be utilized are discussed.
This paper shows a possible path for the introduction of Mobile Service agents within an advanced... more This paper shows a possible path for the introduction of Mobile Service agents within an advanced Broadband Intelligent Network environment. The potential benefits of Distributed Object Technology and Mobile Agents Technology are described and the overall architecture is defined. Then some multimedia services and personal mobility service features are introduced in order to show the wide spectrum of Telecommunication services that can exploit this architecture.
This paper identifies issues related to the service design process in an advanced distributed Int... more This paper identifies issues related to the service design process in an advanced distributed Intelligent Network environment. Starting from the fundamental definition of the Intelligent Network Conceptual Model (INCM) it highlights its basic, intrinsic properties and underlying assumptions. In an effort to enhance the traditional IN architecture with distributed, object oriented features, it identifies areas of the IN where Mobile Agent and Distributed Object Technology concepts can be readily introduced. Furthermore it presents the way in which issues arising from that introduction manifest themselves, their interrelations and the potential design pitfalls they can lead to. The paper proposes a set of implementation principles for service design and identifies their implication on the overall system architecture but also to the service creation process itself. The paper then goes on to describe a service creation process that takes into consideration the introduction of novel soft...
The Intelligent Network (IN) architecture represents a very good solution to the problem of servi... more The Intelligent Network (IN) architecture represents a very good solution to the problem of service offering in the telecommunications environment, since it decouples switching and call control functionality from the service related one. However, its rigid centralised architecture has intrinsic bottlenecks, which could harm its performance, and traditional approach to service design and deployment limits the possibility to introduce new services efficiently. This paper examines the benefits given to IN by the adoption of Distributed Object and Mobile Agent Technologies, and reports the approach of the ACTS MARINE (Mobile Agent enviRonments in Intelligent Networks) project.
The Intelligent Broadband Network (IBN) enables efficient provision of advanced multimedia servic... more The Intelligent Broadband Network (IBN) enables efficient provision of advanced multimedia services to users, exploiting the benefits of the ATM technology and hiding the limitations of current signalling systems to IBN service designers. The availability of technologies like DOT (Distributed Object Technology) and MAT (Mobile Agent Technology) opens new horizons towards the Distributed Intelligent Networks (DIN). Among the main issues that need to be addressed, in the area of the DIN, are the deployment, provision and control of advanced services. The potentials originating from the utilisation of DOT and MAT along with the employment of concepts and ideas coming from the object oriented design patterns community provide the basis for enhancements in the service design and creation process. This paper introduces a set of implementation principles for the service creation, deployment and management and shows their implications on the overall system architecture. We argue that with t...
Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2012
ABSTRACT Remote monitoring is considered one key factor towards the improvement of elderly people... more ABSTRACT Remote monitoring is considered one key factor towards the improvement of elderly people’s quality of life and the reduction of healthcare costs. This paper discusses the prevailing network and software architectural principles in this sector and presents the way that they are applied into the inCASA platform. We emphasize on how services could be offered in a standard and re-usable way on top of the underlying physical layers. The aim is to apply Service Oriented Architecture (SOA) in a healthcare-based Internet of Things (IoT) environment. This approach supports a combined telecare and telehealth solution for monitoring of frail elderly people.
Remote healthcare monitoring has attracted the interest of many research projects during last yea... more Remote healthcare monitoring has attracted the interest of many research projects during last years. The need to address the issue of ageing population has lead to the exploitation of modern communication and software technologies in this domain too. This is instigated by related technological evolutions such as the evolutions in sensor networks which can now support self organization. This paper presents the INCASA architecture that provides advances towards mainly two directions. To start with, by using the appropriate middleware, it manages to transform the network of devices to a network of services following a Service Oriented Architecture. In this way, it turns the implementation of applications (e.g. clinical applications) on top of the middleware to be easy and efficient. Furthermore, INCASA architecture provides an integrated solution for profiling user habits. This is particularly important in case of elderly people who tend to follow daily activities in a repeating manner...
Fast Healthcare Interoperability Resources (FHIR) is considered to be an emerging Health Level 7 ... more Fast Healthcare Interoperability Resources (FHIR) is considered to be an emerging Health Level 7 (HL7) standard that takes advantage of the positive elements of its ancestors HL7 v2 and HL7 v3. Moreover, FHIR is based on the REST architectural style, thus being suitable for lightweight devices. This paper presents the AidIT mobile application aiming at the effective management of patients' electronic personal health records via an easy to use interface which can be accessed by multiple actors, namely the patient, the doctor and the pharmacist. We discuss the implementation benefits of using FHIR in order to integrate the mobile client and the application's server side and we also provide insights into the access control mechanisms that should govern such applications.
Abstract This paper describes an ICT platform aiming to support the well-being of frail elderly p... more Abstract This paper describes an ICT platform aiming to support the well-being of frail elderly people and facilitate them to stay longer and more healthily in their own home. Its principal characteristic is the combination of Telehealth and Telecare monitoring in a unified way, ...
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Papers by Iakovos Venieris