2012 IEEE 24th International Conference on Tools with Artificial Intelligence, 2012
Social Networking Services (SNS) provide users with functionalities for developing their on line ... more Social Networking Services (SNS) provide users with functionalities for developing their on line social networks, connecting with other users, sharing and consuming content. While most of popular SNS provide open Web 2.0 APIs, they remain disconnected from each other thus fragmenting user's data, social network and content. Semantic social web technologies such as public vocabularies and ontologies can be used for bridging the semantic gap between different SNS.
... Kameas, Achilles D. "Deploying Ubiquitous Computing ... more ... Kameas, Achilles D. "Deploying Ubiquitous Computing Applications on Heterogeneous Next Generation Networks." In Ubiquitous and Pervasive Computing: Concepts, Methodologies, Tools, and Applications, ed. Judith Symonds, 330-352 (2010), accessed October 12, 2011. ...
2011 Seventh International Conference on Intelligent Environments, 2011
ABSTRACT One of the principal objectives of today's ambient intelligence environments is ... more ABSTRACT One of the principal objectives of today's ambient intelligence environments is to provide users with services according to their activity, i.e. preferences in order to accomplisha specific user goal. For this purpose, miscellaneous user information must be collected and structured into user profiles. These profiles offer the advantage of being easily enriched and exploitable by the environment, in order to deliver to the user, at any moment and at any place, the best fitted service, with regard to his activity. In this paper we present an ontology-based user profile model which provides the static data about a user but also the context of the user in a given situation in real time.
Proceedings of the 6th Balkan Conference in Informatics on - BCI '13, 2013
ABSTRACT An important task when designing educational material for distance learning is the model... more ABSTRACT An important task when designing educational material for distance learning is the modeling of the teaching domain. However this representation should be formal and semantically standardized in order to be reusable. In this work we propose an ontology-based model for the formal specification of the relations which have been used for the representation of a cognitive domain. This ontology has been used for the representation of the educational material developed for Hellenic Open University (HOU).
2012 IEEE 12th International Conference on Advanced Learning Technologies, 2012
ABSTRACT Learning outcomes are statements that should accompany any type of educational material ... more ABSTRACT Learning outcomes are statements that should accompany any type of educational material intended for lifelong learning. These statements deliver important information, which works as an indicator for students in the process of learning. However, in order for this information to be further utilizable within the context of intelligent e-learning applications, a more fine-grained definition and structure should be adopted. Having these in mind, we initially assign a strict and rather technical definition for the notion of learning outcomes, which is fully aligned, though, with their educational purpose. We then propose an ontological model for their representation and classification, which fully adheres to this definition. Our ultimate goal is to provide the mean for exploiting all aspects of knowledge implied by such statements within intelligent applications. To bear out this possibility, we apply our model to a selected piece of educational material provided by the Hellenic Open University.
2012 16th Panhellenic Conference on Informatics, 2012
ABSTRACT The learning of programming languages requires the student to develop systematic represe... more ABSTRACT The learning of programming languages requires the student to develop systematic representations of the lexical constructs and semantic principles of the languages. At the same time, tutors are expected to develop the appropriate training content. In this paper we propose the combination of two techniques to make the above tasks more efficient. Firstly, we propose to use Learning Objects (LOs), for the organization of educational content. At the same time, ontologies are rich knowledge representation structures that can be utilized for modeling the domain concepts. We then present how we can take advantage of the ontological models for two very popular programming languages - that is Java and C - in an attempt to provide tutors with the possibility to better organize their educational material.
2008 Second IEEE International Conference on Self-Adaptive and Self-Organizing Systems Workshops, 2008
Context-aware systems are an emerging genre of computer systems that help add some forms of intel... more Context-aware systems are an emerging genre of computer systems that help add some forms of intelligence to our surroundings. The ATRACO project uses the ambient ecology metaphor to conceptualize a space populated by connected devices and services that are interrelated with each other, the environment and the people, supporting the users' everyday activities in a meaningful way. Everyday appliances, devices,
In this paper, the model and architecture of the multimedia subsystem of a distributed authoring ... more In this paper, the model and architecture of the multimedia subsystem of a distributed authoring environment called VAS (Virtual Authoring System) axe presented. VAS is an authoring environment that integrates various tools and provides a common communication basis for the tools and the designers who use them. Its underlying model is based on existing actor models, implementing all the society-modeling capabilities these models exhibit, while the Client Facilitator Consultant model is used to model the systemwise tool behaviour. The Multimedia Distributed Filing System (MDFS) of VAS meets many requirements users have from multimedia systems and uses VAS model to provide system users with transparent access to multimedia objects. MDFS consists of many co-operating servers, which implement VAS actor-based model. To take advantage of many well-established standards, MDFS communications have been implemented upon the Berkeley Unix socket library. The distributed nature of VAS offers a new perspective to the authoring process and the system's object-oriented model has led to an open-ended architecture, which permits the integration of new tools and supports the system's evolution to meet new emerging requirements.
This work presents an improved solution to the problem of determining effective multiprocessor sc... more This work presents an improved solution to the problem of determining effective multiprocessor scheduling polldes for real-time repetitive tasks. In order for this approach to be applicable to some task, the probability density function of its execution time, a value function and a criticality i~ctor are required. When these parameters are available, the proposed method constructs effective schedules for repetitive tasks that yield acceptable intermediate results; in addition, these schedules tend to degrade gracefully under "heavy" load conditions. A three-phase process is proposed: first a balanced allocation of tasks is attempted using the rate-monotone first-fit algorithm; then the schedule for each processing duster is constructed by using a linear programming formulation of the task system. This formulation considers many important parameters not considered by previous approaches, and constitutes the proposed improvement over previous work. Finally, the schedule for the entire system is derived from the partial schedules.
2nd IET International Conference on Intelligent Environments (IE 06), 2006
In this paper we attempt to define a mathematical model for the formal study of the concept of Di... more In this paper we attempt to define a mathematical model for the formal study of the concept of Digital Territories (DT) and its properties. We describe a simple DT model and employ the first order language of graphs and random graph properties in order to define and study properties of DTs that emerge as soon as the entities (within the DT) population reaches certain threshold points. Our aim is to show that the DT concept can be formalized and studied using mathematical tools that are within reach of any researcher in the DT domain in order to describe and study properties of interest.
The aim of this work is to bring the Ambient Intelligence (AmI) (1) concept in a new level by int... more The aim of this work is to bring the Ambient Intelligence (AmI) (1) concept in a new level by introducing it to living organisms -plants. In this paper we provide a concrete scenario where an augmented plant, an ePlant can be incorporated in a ubiquitous computing environment in order to work together with other augmented objects, artifacts, in order to provide to the environment status of its condition. The paper presents the enabling infrastructure and the tools that are used to make such an application, and discusses on how we can make these augmented items to collaborate in order to create mixed societies of plants and artifacts.
2012 IEEE 24th International Conference on Tools with Artificial Intelligence, 2012
Social Networking Services (SNS) provide users with functionalities for developing their on line ... more Social Networking Services (SNS) provide users with functionalities for developing their on line social networks, connecting with other users, sharing and consuming content. While most of popular SNS provide open Web 2.0 APIs, they remain disconnected from each other thus fragmenting user's data, social network and content. Semantic social web technologies such as public vocabularies and ontologies can be used for bridging the semantic gap between different SNS.
... Kameas, Achilles D. "Deploying Ubiquitous Computing ... more ... Kameas, Achilles D. "Deploying Ubiquitous Computing Applications on Heterogeneous Next Generation Networks." In Ubiquitous and Pervasive Computing: Concepts, Methodologies, Tools, and Applications, ed. Judith Symonds, 330-352 (2010), accessed October 12, 2011. ...
2011 Seventh International Conference on Intelligent Environments, 2011
ABSTRACT One of the principal objectives of today's ambient intelligence environments is ... more ABSTRACT One of the principal objectives of today's ambient intelligence environments is to provide users with services according to their activity, i.e. preferences in order to accomplisha specific user goal. For this purpose, miscellaneous user information must be collected and structured into user profiles. These profiles offer the advantage of being easily enriched and exploitable by the environment, in order to deliver to the user, at any moment and at any place, the best fitted service, with regard to his activity. In this paper we present an ontology-based user profile model which provides the static data about a user but also the context of the user in a given situation in real time.
Proceedings of the 6th Balkan Conference in Informatics on - BCI '13, 2013
ABSTRACT An important task when designing educational material for distance learning is the model... more ABSTRACT An important task when designing educational material for distance learning is the modeling of the teaching domain. However this representation should be formal and semantically standardized in order to be reusable. In this work we propose an ontology-based model for the formal specification of the relations which have been used for the representation of a cognitive domain. This ontology has been used for the representation of the educational material developed for Hellenic Open University (HOU).
2012 IEEE 12th International Conference on Advanced Learning Technologies, 2012
ABSTRACT Learning outcomes are statements that should accompany any type of educational material ... more ABSTRACT Learning outcomes are statements that should accompany any type of educational material intended for lifelong learning. These statements deliver important information, which works as an indicator for students in the process of learning. However, in order for this information to be further utilizable within the context of intelligent e-learning applications, a more fine-grained definition and structure should be adopted. Having these in mind, we initially assign a strict and rather technical definition for the notion of learning outcomes, which is fully aligned, though, with their educational purpose. We then propose an ontological model for their representation and classification, which fully adheres to this definition. Our ultimate goal is to provide the mean for exploiting all aspects of knowledge implied by such statements within intelligent applications. To bear out this possibility, we apply our model to a selected piece of educational material provided by the Hellenic Open University.
2012 16th Panhellenic Conference on Informatics, 2012
ABSTRACT The learning of programming languages requires the student to develop systematic represe... more ABSTRACT The learning of programming languages requires the student to develop systematic representations of the lexical constructs and semantic principles of the languages. At the same time, tutors are expected to develop the appropriate training content. In this paper we propose the combination of two techniques to make the above tasks more efficient. Firstly, we propose to use Learning Objects (LOs), for the organization of educational content. At the same time, ontologies are rich knowledge representation structures that can be utilized for modeling the domain concepts. We then present how we can take advantage of the ontological models for two very popular programming languages - that is Java and C - in an attempt to provide tutors with the possibility to better organize their educational material.
2008 Second IEEE International Conference on Self-Adaptive and Self-Organizing Systems Workshops, 2008
Context-aware systems are an emerging genre of computer systems that help add some forms of intel... more Context-aware systems are an emerging genre of computer systems that help add some forms of intelligence to our surroundings. The ATRACO project uses the ambient ecology metaphor to conceptualize a space populated by connected devices and services that are interrelated with each other, the environment and the people, supporting the users' everyday activities in a meaningful way. Everyday appliances, devices,
In this paper, the model and architecture of the multimedia subsystem of a distributed authoring ... more In this paper, the model and architecture of the multimedia subsystem of a distributed authoring environment called VAS (Virtual Authoring System) axe presented. VAS is an authoring environment that integrates various tools and provides a common communication basis for the tools and the designers who use them. Its underlying model is based on existing actor models, implementing all the society-modeling capabilities these models exhibit, while the Client Facilitator Consultant model is used to model the systemwise tool behaviour. The Multimedia Distributed Filing System (MDFS) of VAS meets many requirements users have from multimedia systems and uses VAS model to provide system users with transparent access to multimedia objects. MDFS consists of many co-operating servers, which implement VAS actor-based model. To take advantage of many well-established standards, MDFS communications have been implemented upon the Berkeley Unix socket library. The distributed nature of VAS offers a new perspective to the authoring process and the system's object-oriented model has led to an open-ended architecture, which permits the integration of new tools and supports the system's evolution to meet new emerging requirements.
This work presents an improved solution to the problem of determining effective multiprocessor sc... more This work presents an improved solution to the problem of determining effective multiprocessor scheduling polldes for real-time repetitive tasks. In order for this approach to be applicable to some task, the probability density function of its execution time, a value function and a criticality i~ctor are required. When these parameters are available, the proposed method constructs effective schedules for repetitive tasks that yield acceptable intermediate results; in addition, these schedules tend to degrade gracefully under "heavy" load conditions. A three-phase process is proposed: first a balanced allocation of tasks is attempted using the rate-monotone first-fit algorithm; then the schedule for each processing duster is constructed by using a linear programming formulation of the task system. This formulation considers many important parameters not considered by previous approaches, and constitutes the proposed improvement over previous work. Finally, the schedule for the entire system is derived from the partial schedules.
2nd IET International Conference on Intelligent Environments (IE 06), 2006
In this paper we attempt to define a mathematical model for the formal study of the concept of Di... more In this paper we attempt to define a mathematical model for the formal study of the concept of Digital Territories (DT) and its properties. We describe a simple DT model and employ the first order language of graphs and random graph properties in order to define and study properties of DTs that emerge as soon as the entities (within the DT) population reaches certain threshold points. Our aim is to show that the DT concept can be formalized and studied using mathematical tools that are within reach of any researcher in the DT domain in order to describe and study properties of interest.
The aim of this work is to bring the Ambient Intelligence (AmI) (1) concept in a new level by int... more The aim of this work is to bring the Ambient Intelligence (AmI) (1) concept in a new level by introducing it to living organisms -plants. In this paper we provide a concrete scenario where an augmented plant, an ePlant can be incorporated in a ubiquitous computing environment in order to work together with other augmented objects, artifacts, in order to provide to the environment status of its condition. The paper presents the enabling infrastructure and the tools that are used to make such an application, and discusses on how we can make these augmented items to collaborate in order to create mixed societies of plants and artifacts.
This article focuses on certain aspects of the evaluation methods for the scientific publications... more This article focuses on certain aspects of the evaluation methods for the scientific publications and especially on the influence of those publications. We argue that positive or negative appraisal of the “impact factor” for scientific publications cannot be judged properly out of the systemic context of the contemporary scientific problematic and relevant practices. Thus we comment on these practices under a systemic scope, focusing on critical issues of observing science and scientific results presented, in comparison with the problems ...
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Papers by A. Kameas