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Displaying Results 301 - 325 of 2969 on page 13 of 119
Marked
Mark
Towards Efficient Abstractions for Concurrent Consensus
(2013)
KOUTAVAS, VASILEIOS
Towards Efficient Abstractions for Concurrent Consensus
(2013)
KOUTAVAS, VASILEIOS
Abstract:
Consensus is an often occurring problem in concurrent and distributed programming. We present a programming language with simple semantics and build-in support for consensus in the form of communicating transactions. We motivate the need for such a construct with a characteristic example of generalized consensus which can be naturally encoded in our language. We then focus on the challenges in achieving an implementation that can efficiently run such programs. We setup an architecture to evaluate different implementation alternatives and use it to experimentally evaluate runtime heuristics. This is the basis for a research project on realistic programming language support for consensus
http://hdl.handle.net/2262/67906
Marked
Mark
Reverse Hoare Logic
(2011)
KOUTAVAS, VASILEIOS
Reverse Hoare Logic
(2011)
KOUTAVAS, VASILEIOS
Abstract:
We present a novel Hoare-style logic, called Reverse Hoare Logic, which can be used to reason about state reachability of imperative programs. This enables us to give natural specifications to randomized (deterministic or nondeterministic) algorithms. We give a proof system for the logic and use this to give simple formal proofs for a number of illustrative examples. We define a weakest postcondition calculus and use this to show that the proof system is sound and complete.
http://hdl.handle.net/2262/67872
Marked
Mark
From Applicative to Environmental Bisimulation
(2011)
KOUTAVAS, VASILEIOS
From Applicative to Environmental Bisimulation
(2011)
KOUTAVAS, VASILEIOS
http://hdl.handle.net/2262/67870
Marked
Mark
A Testing Theory for a Higher-Order Cryptographic Language
(2011)
KOUTAVAS, VASILEIOS
A Testing Theory for a Higher-Order Cryptographic Language
(2011)
KOUTAVAS, VASILEIOS
Abstract:
We study a higher-order concurrent language with cryptographic primitives, for which we develop a sound and complete, first-order testing theory for the preservation of safety properties. Our theory is based on co-inductive set simulations over transitions in a first-order Labelled Transition System. This keeps track of the knowledge of the observer, and treats transmitted higher-order values in a symbolic manner, thus obviating the quantification over functional contexts. Our characterisation provides an attractive proof technique, and we illustrate its usefulness in proofs of equivalence, including cases where bisimulation theory does not apply.
http://hdl.handle.net/2262/67871
Marked
Mark
Symbolic bisimulation for a higher-order distributed language with passivation (extended abstract)
(2013)
KOUTAVAS, VASILEIOS; HENNESSY, MATTHEW
Symbolic bisimulation for a higher-order distributed language with passivation (extended abstract)
(2013)
KOUTAVAS, VASILEIOS; HENNESSY, MATTHEW
Abstract:
We study the behavioural theory of a higher-order distributed calculus with private names and locations that can be passivated. For this language, we present a novel Labelled Transition System where higher-order inputs are symbolic agents that can perform a limited number of transitions, capturing the nature of passivation. Standard first-order weak bisimulation over this LTS coincides with contextual equivalence, and provides the first useful proof technique without a universal quantification over contexts for an intricate distributed language.
http://hdl.handle.net/2262/67852
Marked
Mark
Slicepedia: Automating the Production of Learning Objects from Open Corpus Content
(2012)
LAWLESS, SEAMUS
Slicepedia: Automating the Production of Learning Objects from Open Corpus Content
(2012)
LAWLESS, SEAMUS
Abstract:
The World Wide Web (WWW) provides access to a vast array of digital content, a great deal of which could be ideal for incor- poration into eLearning environments. However, reusing such content directly in its native form has proven to be inadequate, and manually customizing it for eLearning purposes is labor-intensive. This paper introduces Slicepedia, a service which enables the discovery, reuse and customization of open corpus resources, as educational content, in order to facilitate its incorporation into eLearning systems. An architecture and implementation of the system is presented along with a preliminary user-trial evaluation suggesting the process of slicing open corpus content correctly decontextualises it from its original context of usage and can provide a valid automated alternative to manually produced educational resources.
http://hdl.handle.net/2262/66843
Marked
Mark
Slicepedia: Towards Long-Tail Resource Production through Open Corpus Reuse
(2012)
LAWLESS, SEAMUS
Slicepedia: Towards Long-Tail Resource Production through Open Corpus Reuse
(2012)
LAWLESS, SEAMUS
Abstract:
The production of resources supporting the needs of Adaptive Hypermedia Systems (AHS) is labor-intensive. As a result, content production is focused upon meeting the needs of resources with higher demand, which limits the extent upon which long tail content requirement niches of AHS can be met. Open corpus slicing attempts to convert the wealth of information available on the World Wide Web, into customizable information objects. This approach could provide the basis of an open corpus supply service meeting long tail content requirements of AHS. This paper takes a case study approach, focusing on an educational sector of adaptive hypermedia, to test out the e?ect of using Slicepedia, a service which enables the discovery, reuse and customization of open corpus resources. An architecture and implementation of the system is presented along with a user-trial evaluation suggesting slicing techniques could represent a valid candidate for long tail content production supply of AHS.
http://hdl.handle.net/2262/66841
Marked
Mark
Exploiting proximity in event-based Middleware for collaborative mobile applications
(2003)
MEIER, RENE; CAHILL, VINNY
Exploiting proximity in event-based Middleware for collaborative mobile applications
(2003)
MEIER, RENE; CAHILL, VINNY
Abstract:
Middleware supporting event-based communication is widely recognized as being well suited to mobile applications since it naturally accommodates a dynamically changing population of interacting entities and the dynamic reconfiguration of the connections between them. STEAM is an event-based middleware designed for use in ad hoc networks. STEAM differs from other event-based middleware in that its architecture does not rely on the presence of any separate infrastructure, event notification filters are distributed, and filtering may be applied to functional and non-functional attributes. In particular, filters may be applied to either the subject or the content of an event notification, or to non-functional attributes, such as location and time. Filters may be used to define geographical areas within which event notifications are valid, thereby bounding the propagation of these notifications. Such proximity-based filtering represents a natural way to filter events of interest in mobil...
http://hdl.handle.net/2262/41076
Marked
Mark
Improving Multiclass Text Classification with Error-Correcting Output Coding and Sub-class Partitions
(2010)
VOGEL, CARL; LI, BAOLI
Improving Multiclass Text Classification with Error-Correcting Output Coding and Sub-class Partitions
(2010)
VOGEL, CARL; LI, BAOLI
Abstract:
Error-Correcting Output Coding (ECOC) is a general framework for multiclass text classification with a set of binary classifiers. It can not only help a binary classifier solve multi-class classification problems, but also boost the performance of a multi-class classifier. When building each individual binary classifier in ECOC, multiple classes are randomly grouped into two disjoint groups: positive and negative. However, when training such a binary classifier, sub-class distribution within positive and negative classes is neglected. Utilizing this information is expected to improve a binary classifier. We thus design a simple binary classification strategy via multi-class categorization (2vM) to make use of sub-class partition information, which can lead to better performance over the traditional binary classification. The proposed binary classification strategy is then applied to enhance ECOC. Experiments on document categorization and question classification show its effectiveness.
http://hdl.handle.net/2262/64055
Marked
Mark
Slotted-Circus: A UTP-Family of Reactive Theories
(2007)
BUTTERFIELD, ANDREW
Slotted-Circus: A UTP-Family of Reactive Theories
(2007)
BUTTERFIELD, ANDREW
Abstract:
We present a generic framework of UTP theories for describing systems whose behaviour is characterised by regular time-slots, compatible with the general structure of the Circus language [WC01a]. This ?slotted-Circus? framework is parameterised by the particular way in which event histories are observable within a time-slot, and specifies what laws a desired parameterisation must obey in order for a satisfactory theory to emerge. Two key results of this work are: the need to be very careful in formulating the healthiness conditions, particularly R2 ; and the demonstration that synchronous theories like SCSP [Bar93] do not fit well with the way reactive systems are currently formulated in UTP and Circus.
http://hdl.handle.net/2262/38446
Marked
Mark
The Denotational Semantics of Slotted-Circus
(2009)
BUTTERFIELD, ANDREW
The Denotational Semantics of Slotted-Circus
(2009)
BUTTERFIELD, ANDREW
http://hdl.handle.net/2262/38447
Marked
Mark
MoCoA: Customisable middleware for context-aware mobile applications
(2006)
CAHILL, VINNY; BOUROCHE, MELANIE
MoCoA: Customisable middleware for context-aware mobile applications
(2006)
CAHILL, VINNY; BOUROCHE, MELANIE
Abstract:
Many programming models have been proposed to facilitate the development of context-aware applications. However, previous work does not offer support for building customised systems and has largely been targeted at a single application domain. In this paper, we describe MoCoA, a flexible middleware framework that permits the rapid development of context-aware applications and supports deployment scenarios ranging from augmented artefacts to city-wide smart-space applications. Crucially, MoCoA supports a small set of programming abstractions that are suitable for building a wide range of context-aware applications for deployment in a fixed or (ad hoc) mobile environment. For each of these abstractions, MoCoA provides a set of implementations via a library of components. We present three applications of the MoCoA framework that demonstrate both the use of the programming abstractions and the flexibility of the framework.
http://hdl.handle.net/2262/32607
Marked
Mark
Towards real-time middleware for applications of vehicular ad hoc networks.
(2005)
MEIER, RENE; CAHILL, VINNY
Towards real-time middleware for applications of vehicular ad hoc networks.
(2005)
MEIER, RENE; CAHILL, VINNY
Abstract:
Applications of inter-vehicle and vehicle-to-roadside communication that make use of vehicular ad hoc networks (VANETs) will often require reliable communication that provides guaranteed real-time message propagation. This paper describes an event-based middleware, called RT-STEAM. Unlike other event systems, RT-STEAM does not rely on a centralized event broker or look-up service while still supporting event channels providing hard real-time event delivery. RT-STEAM event filtering can be based on subject, content and/or proximity. To guarantee real-time communication, we exploit proximitybased event propagation to guarantee real-time constraints within the defined proximities only. The proximity within which realtime guarantees are available is adapted to maintain time bounds while allowing changes to membership and topology, typical of VANETs. This Space-Elastic Model of real-time communication is the first to directly address adaptation in the space domain to guarantee real-time ...
http://hdl.handle.net/2262/32667
Marked
Mark
An overview of the Tigger object-support operating system framework
(1996)
CAHILL, VINNY
An overview of the Tigger object-support operating system framework
(1996)
CAHILL, VINNY
Abstract:
This paper describes the motivations for and main features of Tigger -- a framework for the construction of a family of object-support operating systems that can be tailored for use in a variety of different application domains. An important goal of the design of Tigger is that instantiations of the framework should be able to support (a number of) different object models in order to allow a range of object-oriented languages for distributed or persistent programming to be supported without unnecessary duplication of effort. A further goal of the design is that instantiations of the framework should be able to support the same object model in different ways depending on the requirements of the applications to be supported by those instantiations. This paper describes the main features of the Tigger framework that allow these goals to be realised.
http://hdl.handle.net/2262/32406
Marked
Mark
An overview on legacy system migration
(1997)
WADE, VINCENT PATRICK
An overview on legacy system migration
(1997)
WADE, VINCENT PATRICK
Abstract:
Legacy information systems typically form the backbone of the information flow within an organisation and are the main vehicle for consolidating information about the business. These systems also pose considerable problems - brittleness, inflexibility, isolation, nonextensibility, lack of openness etc -, the so called legacy system problem which opens up a new research topic, legacy system migration. This paper provides a brief review of the main issues involved in legacy information systems migration.
http://hdl.handle.net/2262/27050
Marked
Mark
Evaluation of APeLS - an adaptive eLearning service based on the multi-model, metadata-driven approach
(2004)
CONLAN, OWEN; WADE, VINCENT PATRICK
Evaluation of APeLS - an adaptive eLearning service based on the multi-model, metadata-driven approach
(2004)
CONLAN, OWEN; WADE, VINCENT PATRICK
Abstract:
peer-reviewed
The evaluation of learner and tutor feedback is essential in the production of high quality personalized eLearning services. There are few evaluations available in the Adaptive Hypermedia domain relative to the amount of research interest this domain is attracting. Many of the papers in this domain focus on the technological design of systems without justifying the designs through the lessons learned from evaluations. This paper evaluates the usability and effectiveness of using the multi-model, metadata-driven approach for producing rich adaptive eLearning solutions that remain content and domain independent. Through this independence, the eLearning services developed can utilize many pedagogical approaches and a variety of models to produce a wide range of highly flexible solutions. This paper identifies benefits to learners brought through adopting the multi-model approach gathered over four years of student evaluation. It briefly describes the evaluation of the...
http://hdl.handle.net/2262/22608
Marked
Mark
'Runsort' - An Adaptive Mergesort for Prolog
(2005)
BRADY, MICHAEL HAYES
'Runsort' - An Adaptive Mergesort for Prolog
(2005)
BRADY, MICHAEL HAYES
Abstract:
This note describes a novel list-sorting method for Prolog which is stable, has O(n log n) worst-case behaviour and O(n) best-case behaviour. The algorithm is an adaptive variant of bottom-up mergesort using so-called long runs of preexisting order to improve efficiency; accordingly we have called it `runsort?. Runsort compares favourably with samsort, and a modification to samsort is suggested.
http://hdl.handle.net/2262/5321
Marked
Mark
Towards a Behavioural Theory of Access and Mobility Control in Distributed Systems.
(2004)
HENNESSY, MATTHEW
Towards a Behavioural Theory of Access and Mobility Control in Distributed Systems.
(2004)
HENNESSY, MATTHEW
Abstract:
We de ne a typed bisimulation equivalence for the language Dpi, a dis- tributed version of the -calculus in which processes may migrate between dynamically created locations. It takes into account resource access policies, which can be imple- mented in Dpi using a novel form of dynamic capability types. The equivalence, based on typed actions between con gurations, is justi ed by showing that it is fully-abstract with respect to a natural distributed version of a contextual equivalence. In the second part of the paper we study the e ect of controlling the migration of processes. This a ects the ability to perform observations at speci c locations, as the observer may be denied access. We show how the typed actions can be modi ed to take this into account, and generalise the full-abstraction result to this more delicate scenario.
http://hdl.handle.net/2262/56476
Marked
Mark
CASSANDRA : A Collaborative Anti Spam System Allowing Node Decentralised Research Algorithms
(2003)
Gray, Alan
CASSANDRA : A Collaborative Anti Spam System Allowing Node Decentralised Research Algorithms
(2003)
Gray, Alan
Abstract:
Email has become a critical tool in many people's lives, both professionally and personally. It is easily accessible, inexpensive, fast, versatile and is far-reaching both in terms of the number and spectrum of people to whom it can deliver information. For exactly the same reasons, email is being exploited by mass-marketers, and the unsolicited bulk email (or spam) problem is reaching epidemic proportions, with half of the daily worldwide emails sent being spam. Some sources estimate that spam will cost companies a total of US$20.5 billion in 2003 alone.
The first generation of content-based spam filters has proven inadequate to the taks of sorting legitimate emaial from spam email. This is because of the implicit assumptions in their design and the fact that the filters lack the sophistication to be able to classify all email correctly. Collaborative filtering has proven to be more successful than content-based filtering, but still suffers from lack of scalability and poo...
http://hdl.handle.net/2262/1237
Marked
Mark
Hierarchical Case-Based Reasoning: Integrating Case-Based and Decompositional Problem-Solving Techniques for Plant-Control Software Design
(1997)
Smyth, Barry; Cunningham, Padraig; Keane, Mark T.
Hierarchical Case-Based Reasoning: Integrating Case-Based and Decompositional Problem-Solving Techniques for Plant-Control Software Design
(1997)
Smyth, Barry; Cunningham, Padraig; Keane, Mark T.
Abstract:
TCD-CS-1997-07
Case-based reasoning (CBR) is an AI technique that emphasises the role of past experience during future problem solving. New problems are solved by retrieving and adapting the solutions to similar problems, solutions that have been stored and indexed for future reuse as cases in a case-base. The power of CBR is severely curtailed if problem solving is limited to the retrieval and adaptation of a single case, and for this reason the strategy of reusing multiple cases is immediately appealing. This paper describes the technique of hierarchical case-based reasoning, which allows complex problems to be solved by reusing multiple cases at various levels of abstraction. The technique is described in the context of Deja Vu, a CBR system aimed at automating plant-control software design.
http://hdl.handle.net/2262/12979
Marked
Mark
Trust Enhanced Ubiquitous Payment without Too Much Privacy Loss
(2004)
Seigneur, Jean-Marc; Jensen, Christian D.
Trust Enhanced Ubiquitous Payment without Too Much Privacy Loss
(2004)
Seigneur, Jean-Marc; Jensen, Christian D.
Abstract:
TCD-CS-2004-37
Computational models of trust have been proposed for use in ubicomp environments for deciding whether to allow customers to pay with an e-purse or not. In order to build trust in a customer, a means to link transactions using the same e-purse is required. Roughly, trust is a result of knowledge. As the number of transactions increases, the resulting increase in knowledge about the user of the e-purse threatens privacy due to global profiling. We present a scheme (and its prototype) that mitigates this loss of privacy without forbidding the use of trust for smoothing payment by giving the opportunity to the user to divide trust (i.e. transactions) according to context (e.g. location, user?s current activity or subset of shops).
http://hdl.handle.net/2262/13241
Marked
Mark
The Role of Identity in Pervasive Computational Trust
(2004)
Seigneur, Jean-Marc; Jensen, Christian D.
The Role of Identity in Pervasive Computational Trust
(2004)
Seigneur, Jean-Marc; Jensen, Christian D.
Abstract:
TCD-CS-2004-48
A central element in the human notion of trust is to identify whom or what is under consideration. In the digital world, this is harder to achieve due to more or less trustworthy technical infrastructure between interacting parties. However, we argue that uncertain identification may enhance privacy protection. We present the role of identity and how identity can be managed in a trust-based security framework, in order to balance these concerns, and present a discussion of our design and implementation choices.
http://hdl.handle.net/2262/13219
Marked
Mark
An Incremental Retrieval Mechanism for Case-Based Electronic Fault Diagnosis
(1998)
Cunningham, Padraig; Smyth, Barry; Bonzano, Andrea
An Incremental Retrieval Mechanism for Case-Based Electronic Fault Diagnosis
(1998)
Cunningham, Padraig; Smyth, Barry; Bonzano, Andrea
Abstract:
TCD-CS-1998-18
One problem with using CBR for diagnosis is that a full case description may not be available at the beginning of the diagnosis. The standard CBR methodology requires a detailed case description in order to perform case retrieval and this is often not practical in diagnosis. We describe two fault diagnosis tasks where many features may make up a case description but only a few features are required in an individual diagnosis. We evaluate an incremental CBR mechanism that can initiate case retrieval with a skeletal case description and will elicit extra discriminating information during the diagnostic process.
http://hdl.handle.net/2262/12999
Marked
Mark
Mobile Software Licensing
(2003)
DUSPARIC, IVANA
Mobile Software Licensing
(2003)
DUSPARIC, IVANA
Abstract:
Licensing models and license management systems are going through major changes because the traditional shrink-wrapped software way of licensing does not meet the needs of the modern software market. In particular the emergence of new platforms, such as mobile computing and the assumption by software vendors of clients possessing network connected software, will revolutionize how software is licensed and managed. Software license systems are moving towards more #29;exibility and supporting several licensing models. Usage of the software can be tracked by licensing servers, and new pay-per-use models are being introduced. This paper reviews current situation in the mobile software applications, analyzes current licensing systems and models used in mobile computing and issues associated with them, and introduces possible future developments in the #28;eld.
http://hdl.handle.net/2262/33434
Marked
Mark
A Multiplayer Case Based Story Engine
(2003)
Fairclough, Chris; Cunningham, Padraig
A Multiplayer Case Based Story Engine
(2003)
Fairclough, Chris; Cunningham, Padraig
Abstract:
TCD-CS-2003-43
This paper describes the development of an expert casebased character director system which dynamically generates and controls a story, which is played out in a multiplayer networked game world. The system handles multiple users in a game world and directs the non player characters therein to perform for the users parallel storylines, interweaving character roles in each story. The story is told through a `narrative of actions? and automatically generated dialogue. Much of the storytelling approach is based on the seminal work of Vladimir Propp, to which is applied the AI case based planning paradigm. Initial analysis of the system is based on a review of the system and its output, but future work will involve developing a more objective format for analysis.
http://hdl.handle.net/2262/12599
Displaying Results 301 - 325 of 2969 on page 13 of 119
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