Athanasios Plessas Computer and Informatics Engineer, MSc, PhD

@inproceedings{Garofalakis2019,

title = {Modelling Legal Documents For Their Exploitation As Open Data},

author = {John Garofalakis and Konstantinos Plessas and Athanasios Plessas and Panoraia Spiliopoulou},

editor = {Witold Abramowicz and Rafael Corchuelo},

url = {https://link.springer.com/chapter/10.1007/978-3-030-20485-3_3},

doi = {10.1007/978-3-030-20485-3_3},

isbn = {978-3-030-20484-6},

year  = {2019},

date = {2019-05-18},

booktitle = {Business Information Systems. BIS 2019.},

volume = {353},

pages = {30-44},

publisher = {Springer, Cham},

series = {Lecture Notes in Business Information Processing},

abstract = {As our society becomes more and more complex, legal documents are produced at an increasingly fast pace, generating datasets that show many of the characteristics that define Big Data. On the other hand, as the trend of Open Data has spread widely in the government sector nowadays, publication of legal documents in the form of Open Data is expected to yield important benefits. In this paper, we propose the modelling of Greek legal texts based on the Akoma Ntoso document model, which is a necessary step for their representation as Open Data and we describe use cases that show how these massive legal open datasets could be further exploited.},

keywords = {Akoma Ntoso, Greek legislation, Legal Open Data, Modelling},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis2018,

title = {A Project for the Transformation of Greek Legal Documents into Legal Open Data},

author = {John Garofalakis and Konstantinos Plessas and Athanasios Plessas and Panoraia Spiliopoulou},

doi = {10.1145/3291533.3291548},

isbn = {978-1-4503-6610-6},

year  = {2018},

date = {2018-11-30},

booktitle = {Proceedings of the 22th Pan-Hellenic Conference on Informatics},

publisher = {ACM},

address = {New York, NY, USA},

series = {PCI '18},

abstract = {In modern states, the operation of the three branches of government (executive, legislative and judicial) results in the generation of a huge volume of data (e.g. legislative documents, decisions, reports, statistics etc.). Publication of government data in the form of Open Data is expected, among other benefits, to drive economic development and promote transparency. This is also true for legal data, since new services for citizens, companies, legal professionals and governments could emerge as a result of the availability of Legal Open Data. Since such information is usually published in unstructured formats, automated approaches could highly facilitate the transformation of unstructured data into structured Open Data, according to the 5-star Open Data scheme. In this paper, we present an ongoing project about the automated analysis and processing of Greek legal documents for their transformation into Legal Open Data. We briefly review the current state of Legal Open Data in Greece, we present the project’s research questions and analyze our initial thoughts for the implementation methodology; we discuss the challenges of such an effort and finally we elaborate the expected contributions.},

keywords = {Akoma Ntoso, Greek legislation, Legal Open Data, Legal Text Analysis},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis2016,

title = {A semi-automatic system for the consolidation of Greek legislative texts},

author = {John Garofalakis and Konstantinos Plessas and Athanasios Plessas},

url = {http://doi.acm.org/10.1145/3003733.3003735

https://dl.dropboxusercontent.com/u/104921582/pci2016_presentation.pdf},

doi = {10.1145/3003733.3003735},

isbn = {978-1-4503-4789-1},

year  = {2016},

date = {2016-11-12},

booktitle = {Proceedings of the 20th Pan-Hellenic Conference on Informatics},

pages = {1:1--1:6},

publisher = {ACM},

address = {New York, NY, USA},

series = {PCI '16},

abstract = {The process of manually consolidating the historical revisions of law documents, by finding and applying in the appropriate chronological order all existing modifications to the original text, is usually tedious and mentally demanding. However, since legal language is highly structured, natural language processing techniques can be adopted to automate this process. In this paper, we present a semi-automatic system for the consolidation of Greek legislative texts, following an approach based on regular expressions. Consolidated versions of laws are pushed in a revision control system, enhancing open access to legislation. A manual step is necessary in order to fix system failures caused by syntax errors or related to wrong application of the legal rules by law makers.},

keywords = {Greek legislation, law revisions, law text analysis, natural language processing, regular expressions},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Plessas2016b,

title = {An Investigation on the Application Developer Attitude Towards Greek Open Government Data},

author = {Athanasios Plessas and Ioanna Dionysiou},

url = {http://doi.acm.org/10.1145/3003733.3003738},

doi = {10.1145/3003733.3003738},

isbn = {978-1-4503-4789-1},

year  = {2016},

date = {2016-11-12},

booktitle = {In Proceedings of the 20th Pan-Hellenic Conference on Informatics},

pages = {44:1--44:4},

publisher = {ACM},

series = {PCI '16},

abstract = {Public sector information (PSI) reuse and especially open data is a sector which the European Union is putting a lot of emphasis on, as it is seen as an opportunity to boost economic growth. The first results of the European Union's Open Public Data policies are already visible in Greece, however much more need still to be done. In this paper we briefly review the content of the Greek Open Government Data Portal and we present a preliminary survey that investigates the attitude of web and mobile applications developers towards open public data.},

keywords = {Open Data, Open Government Data, Public Sector Information},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis2016b,

title = {Automatic identification, extraction and application of textual amendments in Greek legislative texts},

author = {John Garofalakis and Konstantinos Plessas and Athanasios Plessas},

url = {http://ebooks.iospress.nl/publication/45757},

doi = {10.3233/978-1-61499-726-9-187},

isbn = {978-1-61499-726-9},

year  = {2016},

date = {2016-10-12},

booktitle = {Legal Knowledge and Information Systems. JURIX 2016: The Twenty-Ninth Annual Conference},

volume = {294},

pages = {187-190},

publisher = {IOS Press},

series = { Frontiers in Artificial Intelligence and Applications},

abstract = {The automatic analysis of legislative texts using Natural Language Processing techniques is able to facilitate several tasks related to the legislation lifecycle, such as the consolidation of different versions of legal documents. We present our work on the automatic identification, extraction and application of textual amendments in Greek legislative texts, based on pattern matching with regular expressions, which is part of a semi-automatic system for the consolidation of Greek laws.},

keywords = {Greek legislation, legal Artificial Intelligence, natural language processing, regular expressions, textual amendments},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis:2015:AAG:2801948.2802037,

title = {Automated Analysis of Greek Legislative Texts for Version Control: Limitations, Caveats and Challenges},

author = { John Garofalakis and Konstantinos Plessas and Athanasios Plessas},

url = {http://doi.acm.org/10.1145/2801948.2802037},

doi = {10.1145/2801948.2802037},

isbn = {978-1-4503-3551-5},

year  = {2015},

date = {2015-10-01},

booktitle = {Proceedings of the 19th Panhellenic Conference on Informatics},

pages = {115--116},

publisher = {ACM},

address = {Athens, Greece},

series = {PCI '15},

abstract = {Greek legislation is produced in the form of texts often containing amendments and references to precedent laws. This structure imposes an increased cognitive complexity and makes it very difficult for citizens to reconstruct the current version of a law. In this paper we present our ongoing work on the automated analysis of Greek legislative texts, aiming to track the evolution of laws through version control systems. We put emphasis on the challenges, the limitations and the encountered problems of our attempt so far, which are due to the unfriendly - from a technological perspective - legislative procedures that are followed.},

keywords = {law text analysis, legislation, natural language processing, version control},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Plessas2015,

title = {Assessing Physical Location as a Potential Contextual Cue For Adaptive Mobile Contact Lists},

author = {Athanasios Plessas and Olga Georgiadou and Vassilios Stefanis and Andreas Komninos and John Garofalakis},

url = {http://dx.doi.org/10.1109/CIT/IUCC/DASC/PICOM.2015.195},

doi = {10.1109/CIT/IUCC/DASC/PICOM.2015.195},

isbn = {978-1-5090-0153-8},

year  = {2015},

date = {2015-10-01},

booktitle = {Ubiquitous Computing and Communications (IUCC), 2015 IEEE International Conference on},

pages = {1316-1324},

publisher = {IEEE},

abstract = {The retrieval of the appropriate contact in order to start a new communication session from the contact repository of mobile devices can be a time consuming procedure since mobile contact lists usually contain hundreds of items. Several researchers have focused in the past on predicting the next contact a user is likely to call, a task that could prove useful in designing adaptive context-aware interfaces for the mobile contact list. Most of the researchers propose several contextual dimensions that could be used to predict the next callee, location being one of them. However, none of these research works have ever examined the impact of location on mobile communications and only few have actually incorporated this contextual dimension on their implementations. In this paper, we examine physical location as a contextual cue for adaptive mobile contact lists by analyzing call logs from the Nokia Mobile Data Challenge dataset. Our work indicates that, contrary to previous literature, the consideration of physical location as a context dimension does not necessarily lead to improvements in the accuracy of predicting the likelihood of communication with contacts for all types of users included in the dataset under review. Finally, we also discuss the possible reasons behind this limited impact.},

keywords = {adaptive contact list, call prediction, context awareness, physical location},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis:2014:LSS:2692983.2693049,

title = {Location Sharing Services As Sensors for Analyzing Airports' Traffic},

author = { John Garofalakis and Ioannis Georgoulas and Andreas Komninos and Periklis Ntentopoulos and Athanasios Plessas},

url = {http://dx.doi.org/10.4108/icst.mobiquitous.2014.257878},

doi = {10.4108/icst.mobiquitous.2014.257878},

isbn = {978-1-63190-039-6},

year  = {2014},

date = {2014-12-01},

booktitle = {Proceedings of the 11th International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services},

pages = {395--396},

publisher = {ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering)},

address = {London, United Kingdom},

series = {MOBIQUITOUS '14},

abstract = {Location sharing services can be seen as "social sensors" that provide data revealing real world interactions. In this paper, we examine the case of foursquare check-ins at airports and we show that these data can be indicative of the passengers' traffic, while their number is hundreds of times lower than the number of actual traffic observations.},

keywords = {Check-ins, Foursquare, Location sharing services, Ubiquitous social computing},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{6962188,

title = {Non-verbal audio and tactile mobile navigation},

author = {Andreas Komninos and Marianna Astrantzi and Athanasios Plessas and Vassilios Stefanis and John Garofalakis},

url = {http://dx.doi.org/10.1109/WiMOB.2014.6962188},

doi = {10.1109/WiMOB.2014.6962188},

year  = {2014},

date = {2014-10-01},

booktitle = {Wireless and Mobile Computing, Networking and Communications (WiMob), 2014 IEEE 10th International Conference on},

pages = {314-321},

publisher = {IEEE},

abstract = {As typical turn by turn systems fail in several aspects to provide an engaging experience to pedestrians in urban environments, we investigate the potential of alternative interaction methods for navigation. We present a two-phase experiment, involving both audio and tactile navigation and discuss the collected evaluation data. Our findings show a positive reception of implicit navigation from our users.},

keywords = {audio navigation, implicit navigation, tactile navigation, urban environments},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Stefanis:2013:ICR:2493190.2494432,

title = {An Interface for Context-aware Retrieval of Mobile Contacts},

author = { Vassilios Stefanis and Andreas Komninos and Athanasios Plessas and John Garofalakis},

url = {http://doi.acm.org/10.1145/2493190.2494432},

doi = {10.1145/2493190.2494432},

isbn = {978-1-4503-2273-7},

year  = {2013},

date = {2013-01-01},

booktitle = {Proceedings of the 15th International Conference on Human-computer Interaction with Mobile Devices and Services},

pages = {492--497},

publisher = {ACM},

address = {Munich, Germany},

series = {MobileHCI '13},

abstract = {Our work discusses a mobile contact retrieval interface which attempts to contextually predict the contacts a user is likely to need access to, in order to facilitate the retrieval process. We compare our prototype implementation with retrieval from traditional applications (contact list and call log) in a preliminary lab experiment and discuss our findings from user behaviour. We conclude with suggestions on how to improve this interface in order to further enhance the retrieval process.},

keywords = {context-awareness, mobile contact lists, mobile information retrieval},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{6377419,

title = {Efficient Support of Context-Driven Interfaces for Mobile Devices},

author = {Vassilios Stefanis and Athanasios Plessas and Andreas Komninos and John Garofalakis},

url = {http://dx.doi.org/10.1109/PCi.2012.26},

doi = {10.1109/PCi.2012.26},

isbn = {978-1-4673-2720-6},

year  = {2012},

date = {2012-10-01},

booktitle = {Informatics (PCI), 2012 16th Panhellenic Conference on},

pages = {363-368},

publisher = {IEEE},

abstract = {We examine the performance of the Fast Map algorithm when applied on mobile devices for context dimensionality reduction. Our results show that this algorithm is extremely fast and is appropriate for mobile context datasets that need to be processed in real time. This fact supports our vision for context-driven interfaces generated by applying the method of mobile context dimensionality reduction that will support the richness of data stored in personal devices.},

keywords = {context awareness, dimensionality reduction, FastMap performance},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Stefanis:2012:PUC:2371574.2371579,

title = {Patterns of Usage and Context in Interaction with Communication Support Applications in Mobile Devices},

author = { Vassilios Stefanis and Athanasios Plessas and Andreas Komninos and John Garofalakis},

url = {http://doi.acm.org/10.1145/2371574.2371579},

doi = {10.1145/2371574.2371579},

isbn = {978-1-4503-1105-2},

year  = {2012},

date = {2012-09-01},

booktitle = {Proceedings of the 14th International Conference on Human-computer Interaction with Mobile Devices and Services},

pages = {25--34},

publisher = {ACM},

address = {San Francisco, California, USA},

series = {MobileHCI '12},

abstract = {Contact lists are one of the most frequently used applications on mobile devices. Users are reluctant to delete or remove contacts from their repositories and as modern smartphones provide an unlimited contact list storage space, these become increasingly large, sometimes measuring several hundred entries. In this paper we present our findings from two experiments with user-subjective and quantitative data concerning the use of mobile contact lists. We examine the role that frequency and recency of usage plays in the determination of a contact's importance, with a view to aid the speed and efficacy of the information seeking and retrieval process during the use of the contact list application.},

keywords = {contact lists, context awareness, mobile pim},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Komninos:2012:UEU:2371574.2371629,

title = {Urban Exploration Using Audio Scents},

author = { Andreas Komninos and Peter Barrie and Vassilios Stefanis and Athanasios Plessas},

url = {http://doi.acm.org/10.1145/2371574.2371629},

doi = {10.1145/2371574.2371629},

isbn = {978-1-4503-1105-2},

year  = {2012},

date = {2012-09-01},

booktitle = {Proceedings of the 14th International Conference on Human-computer Interaction with Mobile Devices and Services},

pages = {349--358},

publisher = {ACM},

address = {San Francisco, California, USA},

series = {MobileHCI '12},

abstract = {We describe the design and evaluation of an audio-based mixed reality navigation system that uses the concept of audio scents for the implicit guidance of tourists and visitors of urban areas, as an alternative to turn-by-turn guidance systems. A field trial of our prototype uncovers great potential for this type of implicit navigation and is received positively by our participants. We discuss the technical implementation of our prototype, detailed findings from quantitative and subjective evaluation data gathered during the field trial and highlight possible strands for further research and development.},

keywords = {audio mixed reality, implicit navigation, urban environments},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{garofalakisweb,

title = {A Web and mobile-based system for the coordination of civil protection authorities and population warning},

author = { John Garofalakis and Andreas Koskeris and Sotirios Michalopoulos and Athanasios Plessas and Vassilios Stefanis},

editor = {Georgios Boustras and Nikolaos Boukas},

isbn = {9781612335575},

year  = {2012},

date = {2012-01-01},

booktitle = {Proceedings of the 1st International Conference in Safety and Crisis Management in the Construction, Tourism and SME Sectors},

pages = {238--246},

publisher = {BrownWalker Press},

organization = {Universal-Publishers},

abstract = {In  this  paper  we  present  a  scenario  based  system  for  the  instant  notification  and  coordination  of  local authorities after an emergency crisis using web and mobile technologies. The system was implemented for the case of forest fires. Forest fires are a natural phenomenon in forest ecosystems; however, they are also one  of  the  greatest  disaster  hazards.  Despite  the  fact  that  they  cause  a  statistically  smaller  number of victims  compared  to  other  natural  hazards,  such  as earthquakes,  their consequences  to  the  environment as well as the life and economy of the communities are devastating. Wildfire prevention is currently the focus of  many  efforts;  however less  attention  is  given  to  operational  readiness  and  emergency  response  in  su

ch cases. The presented system allows users (e.g. civil protection agencies) to proactively create scenarios that will be executed during a crisis in order to  warn and coordinate local authorities, general public etc. Each scenario consists of several steps and at each step any number of messages can be sent to different groups of  users.  Therefore,  the system  enables  different  groups  of  people  to receive  general  information,  specific 

instructions and guidance during the crisis and after crisis information.},

keywords = {early warning, environmental crisis management, first response},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{AlimiPless2011ax,

title = {Teacher Distance Training in Educational Robotics through Synchronous Audiographic Conferencing: towards a learner-centered approach},

author = {Dimitris Alimisis and Athanasios Plessas},

editor = {Theo Bastiaens and Martin Ebner},

url = {https://www.learntechlib.org/p/37977},

isbn = {978-1-880094-89-1},

year  = {2011},

date = {2011-06-01},

booktitle = {Proceedings of EdMedia: World Conference on Educational Media and Technology 2011},

pages = {901--906},

publisher = {Association for the Advancement of Computing in Education (AACE)},

address = {Lisbon, Portugal},

abstract = {This paper presents a practical use of Synchronous Audio graphic Conferencing (SAC) based on the platform Centra in teacher distance training context realized. The topic of the SAC sessions was educational robotics and especially the technology Lego Mindstorms NXT as a tool for constructionist learning. The learners participated in brainstorming activity, communicated with the trainer and other trainees, shared software applications, participated in opinion polls and were invited to use programming software available only in the trainer’s computer in order to program a robot being on the trainer’s desk. Then they could send their program to the remote robot and watch through a video-camera the reaction of the robot while executing their commands sent distantly. The paper reports the technical and pedagogical setting, explores the potential of the pedagogic strategies and training techniques used to support a learner-centered approach and presents preliminary evaluation results.},

keywords = {},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Plessas2011,

title = {Διδάσκοντας Εκπαιδευτική Ρομποτική σε Εκπαιδευτικούς μέσω Διαδικτυακής Πλατφόρμας Τηλεκπαίδευσης},

author = {Athanasios Plessas and Dimitris Alimisis},

url = {http://www.cetl.elemedu.upatras.gr/proc2/proceedings/1-0707.pdf},

isbn = {978-960-99782-0-0},

year  = {2011},

date = {2011-04-01},

booktitle = {Πρακτικά 2ου Πανελληνίου Συνεδρίου "Ένταξη και Χρήση των ΤΠΕ στην Εκπαιδευτική Διαδικασία"},

pages = {707-717},

abstract = {Η σύγχρονη τηλεκπαίδευση εφαρμόζεται στην εκπαιδευτική διαδικασία όλο και συχνότερα λόγω των πλεονεκτημάτων που προσφέρει. Στην παρούσα εργασία παρουσιάζεται μια προσπάθεια για τη διδασκαλία της εκπαιδευτικής ρομποτικής σε εκπαιδευτικούς μέσω της πλατφόρμας σύγχρονης τηλεκπαίδευσης Centra, η οποία χρησιμοποιήθηκε πιλοτικά σε δύο συνεδρίες - διδασκαλίες της ΑΣΠΑΙΤΕ.},

keywords = {εκπαιδευτική ρομποτική, πλατφόρμα Centra, σύγχρονη τηλεκπαίδευση},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{kdir11,

title = {Context Dimensionality Reduction for Mobile Personal Information Access},

author = {Andreas Komninos and Athanasios Plessas and Vassilios Stefanis and John Garofalakis},

url = {http://dx.doi.org/10.5220/0003688504930498},

doi = {10.5220/0003688504930498},

isbn = {978-989-8425-79-9},

year  = {2011},

date = {2011-01-01},

booktitle = {Proceedings of the International Conference on Knowledge Discovery and Information Retrieval (IC3K 2011)},

pages = {485-490},

abstract = {We propose an application of the Fastmap algorithm that could provide a breakthrough in the efforts to present mobile personal information to the user in context, and describe our vision for context-driven interfaces generated by this method that will support the richness of data stored in personal devices.},

keywords = {context awareness, dimensionality reduction, mobile personal information access},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Komninos:2011:ADR:2030112.2030224,

title = {Application of Dimensionality Reduction Techniques for Mobile Social Context},

author = { Andreas Komninos and Athanasios Plessas and Vassilios Stefanis and John Garofalakis},

url = {http://doi.acm.org/10.1145/2030112.2030224},

doi = {10.1145/2030112.2030224},

isbn = {978-1-4503-0630-0},

year  = {2011},

date = {2011-01-01},

booktitle = {Proceedings of the 13th International Conference on Ubiquitous Computing},

pages = {583--584},

publisher = {ACM},

address = {Beijing, China},

series = {UbiComp '11},

abstract = {We propose the application of a dimensionality reduction algorithm that could provide a breakthrough in the efforts to retrieve and present mobile personal information to the user in context.},

keywords = {context awareness, dimensionality reduction, mobile personal information access},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{garofalakis2010integration,

title = {An Integration Platform of Social Networking Applications to Support Life Long Learning in Rural Territories: the SoRuraLL Virtual Learning World Environment’},

author = { John Garofalakis and Andreas Koskeris and Athanasios Plessas and Vassilios Stefanis},

url = {http://orion.westgate.gr/sall2010/documents/p20.pdf},

issn = {1792-586X},

year  = {2010},

date = {2010-11-01},

booktitle = {Proceedings of International Conference on Social Applications for Lifelong Learning -- SALL 2010},

pages = {104--109},

abstract = {Social networking applications can form a valuable tool towards lifelong learning, especially in rural areas where they can be used to enhance computer literacy and deal with the digital divide. In this paper we present the “SoRuraLL Virtual Learning World”, a platform that was implemented in the framework of the SoRuraLL Lifelong Learning program. The platform, which is organized per user and per user site, combines social networking and e-learning tools and targets populations in rural areas. },

keywords = {life long learning, rural digital divide, social e-learning, Social networking},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Plessas2010,

title = {Ανάλυση σχολικών βιβλίων Πληροφορικής: Η περίπτωση των ηλεκτρονικών πηγών},

author = {Athanasios Plessas and Vassiliki Spiliotopoulou},

url = {http://korinthos.uop.gr/~hcicte10/proceedings/62.pdf},

year  = {2010},

date = {2010-09-01},

booktitle = {Πρακτικά Εργασιών 7ου Πανελλήνιου Συνεδρίου με Διεθνή Συμμετοχή «Οι ΤΠΕ στην Εκπαίδευση»},

volume = {2},

pages = {255--262},

keywords = {ανάλυση σχολικών βιβλίων, αξιολόγηση ηλεκτρονικών πηγών, διδασκαλία Πληροφορικής και ιστοσελίδες},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Plessas2008,

title = {A Route Guidance System Against Traffic Congestion Following a Constrained System Optimal Model},

author = {Athanasios Plessas and John Garofalakis},

year  = {2008},

date = {2008-11-01},

booktitle = {15th World Congress on Intelligent Transport Systems and ITS America's 2008 Annual Meeting},

pages = {1--10},

abstract = {During the last decade, in-vehicle route guidance systems have known a significant spread. These systems, apart from providing assistance to drivers, offer the chance to manage traffic in such a way that allows an increase in road network capacity and therefore a decrease in traffic congestion, without the high cost expansion of the road infrastructure. In this paper, we propose the application of the basic principles of the Constrained System Optimal model, used to solve the traffic assignment problem, in the case of routing a single vehicle. In contrast to the User Optimal model that provides no traffic improvement guarantees and the System Optimal model that is unrealistic, the Constrained System Optimal solution adopts the goal of reducing congestion and at the same time remaining fair for drivers when selecting a route.},

keywords = {constrained system optimal algorithm, route guidance, traffic congestion, vehicle navigation},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{4545612,

title = {A Dynamic Voice Portal for Delivery of Cultural Content},

author = {Evangelia Boufardea and John Garofalakis and Athanasios Plessas},

url = {http://dx.doi.org/10.1109/ICIW.2008.90},

doi = {10.1109/ICIW.2008.90},

isbn = {978-0-7695-3163-2},

year  = {2008},

date = {2008-06-01},

booktitle = {Internet and Web Applications and Services, 2008. ICIW '08. Third International Conference on},

pages = {186-191},

publisher = {IEEE},

abstract = {Many companies today are providing customer services via the Web and the telephone. Demand for providing Web data in audio form is increasing every day. Voice response facilities are used for various kinds of information over the phone: time, weather, horoscopes, lottery results, sports events, news, etc. VoiceXML is an enabling technology for creating a streamlined speech-based interface for web-based information services. Speech technology, as it improves, will become a very natural and powerful interface for ubiquitous access to information. Moreover, VoiceXML applications are available through computers or through the telephone, which is a universal means of communication. In this paper, we describe a dynamic speech-enabled system powered by VoiceXML in which the available information is dynamically generated by PHP.},

keywords = {IVR systems, PHP, speech recognition, Voice portal, VoiceXML},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{4394855,

title = {Representation of Classic MAPS for Mobile Devices. An Interactive Mobile Map Application},

author = {John Garofalakis and Pantelis Papapoulias and Athanasios Plessas},

url = {http://dx.doi.org/10.1109/PIMRC.2007.4394855},

doi = {10.1109/PIMRC.2007.4394855},

isbn = {978-1-4244-1144-3},

year  = {2007},

date = {2007-09-01},

booktitle = {Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on},

pages = {1-5},

abstract = {Nowadays, the rapid growth of mobile devices and mobile applications has changed the way we live. Mobile devices are widely used and they are providing people with needed information anytime and anywhere. People use mobile applications in many ways, for business purposes, as an organizer or even for entertainment. The development of mobile applications needs to be adapted with the special features and limitations of these devices. Looking in this direction, we present a mobile map application that we have developed for Microsoft Windows mobile users, which is using geographic data stored in the device's memory and allows the user to navigate through the map of different cities. A special feature of our application is the simulation of a classic map by giving the user the opportunity to take notes and marks on the map by clicking on the device's screen. These data are stored in the device and based on them we propose some ways to make navigation in mobile map applications faster and easier.},

keywords = {mobile computing, mobile devices, mobile map application},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis2007,

title = {GIS-based Monitoring and Analysis of Environmental and Epidemiological Factors},

author = {John Garofalakis and Theodoula Giannakoudi and Andreas Koskeris and Sotirios Michalopoulos and Athanasios Plessas},

url = {http://pci2007.upatras.gr/proceedings/PCI2007_volB/B_395-403_Garofalakis.pdf},

isbn = {978-960-89784-2-3 },

year  = {2007},

date = {2007-05-01},

booktitle = {Proceedings of the 11th Panhellenic Conference on Informatics},

volume = {B},

pages = {395--403},

publisher = {New Technologies Publications},

abstract = {Environmental pollution is one of the main reasons for health abnormalities and health 

problems. Pollution originated from industrial premises is one of the causes for high health risk in urban areas. In this case, environmental surveillance can have a valuable role in the protection of inhabitants.  We present a GIS – based survey system that allows monitoring of environmental and epidemiological factors near industrial premises. The system was implemented in the framework of the “Environmental Health Surveillance System in urban areas near incinerators and industrial premises” project (Enhance Health), which is financed by the Interreg IIIC East EU program.},

keywords = {Environment surveillance, environmental monitoring, GI S-based system, industrial premises, public health factors, risk assessment analysis},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis2007b,

title = {Vehicle Routing and Road Traffic Simulation: A Smart Navigation System},

author = {John Garofalakis and Polyxeni Nakou and Athanasios Plessas},

url = {http://pci2007.upatras.gr/proceedings/PCI2007_volB/B_611-623_Garofalakis.pdf},

isbn = {978-960-89784-2-3 },

year  = {2007},

date = {2007-05-01},

booktitle = {Proceedings of the 11th Panhellenic Conference on Informatics},

volume = {B},

pages = {611--623},

publisher = {New Technologies Publications},

abstract = {In-vehicle navigation permits people to find their way while driving. Combining these 

applications with road traffic data may result in diminishing traveling time. In this paper we deal with the problem of vehicle routing on today’s congested roads. The result of this study is a web application that provides the user with two possibilities. The user can create a directed graph that corresponds to the city’s road network and he can also find the optimal path that leads to its destination as far as distance and traffic congestion are concerned. As we didn’t have real data about the traffic, we adopt a simulation technique to mimic actual traffic conditions.},

keywords = {In-Vehicle Routing Algorithms, Intelligent Transportation Systems, Road Traffic Simulation, traffic congestion, Traffic Management Systems},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Andriakopoulou:2007:MWM:1352694.1352726,

title = {A Mobile Web Map Application for Route Discovery with Device Independent Characteristics},

author = { Eirini Andriakopoulou and John Garofalakis and Athanasios Plessas},

url = {http://doi.acm.org/10.1145/1352694.1352726},

doi = {10.1145/1352694.1352726},

isbn = {978-1-59593-598-4},

year  = {2007},

date = {2007-01-01},

booktitle = {Proceedings of the 2007 Euro American Conference on Telematics and Information Systems},

pages = {31:1--31:6},

publisher = {ACM},

address = {Faro, Portugal},

series = {EATIS '07},

abstract = {As mobile devices are becoming increasingly powerful and ubiquitous, new possibilities to get route guidance are created, allowing users to save valuable time and effort. However, mobile devices still face severe constraints that limit the possibilities that a mobile route finding application may offer. In this paper, we present a device independent mobile application that enables mobile users to receive route directions to their handheld device. This application is an extension to an existing mobile map delivery system, the m-CHARTIS system. We focus on the main features and we analyse the device independent character of the application. Implementation details are presented and finally directions for future work are proposed.},

keywords = {device independence, mobile application, pedestrian navigation, route guidance},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Garofalakis:2006:WBD:1135777.1135984,

title = {Web Based Device Independent Mobile Map Applications.: The m-CHARTIS System},

author = { John Garofalakis and Theofanis - Aristofanis Michail and Athanasios Plessas},

url = {http://doi.acm.org/10.1145/1135777.1135984

http://wwwconference.org/www2006/programme/files/pdf/p84.pdf},

doi = {10.1145/1135777.1135984},

isbn = {1-59593-323-9},

year  = {2006},

date = {2006-01-01},

booktitle = {Proceedings of the 15th International Conference on World Wide Web},

pages = {999--1000},

publisher = {ACM},

address = {Edinburgh, Scotland},

series = {WWW '06},

abstract = {A map is one of the most useful media in disseminating spatial information. As mobile devices are becoming increasingly powerful and ubiquitous, new possibilities to access map information are created. However, mobile devices still face severe constraints that limit the possibilities that a mobile map application may offer. We present the m-CHARTIS system, a device independent mobile map application that enables mobile users to access map information from their device.},

keywords = {handheld devices, mobile cartography, mobile devices, mobile map application},

pubstate = {published},

tppubtype = {inproceedings}

}