46,556 research outputs found
Citation and peer review of data: moving towards formal data publication
This paper discusses many of the issues associated with formally publishing data in academia, focusing primarily on the structures that need to be put in place for peer review and formal citation of datasets. Data publication is becoming increasingly important to the scientific community, as it will provide a mechanism for those who create data to receive academic credit for their work and will allow the conclusions arising from an analysis to be more readily verifiable, thus promoting transparency in the scientific process. Peer review of data will also provide a mechanism for ensuring the quality of datasets, and we provide suggestions on the types of activities one expects to see in the peer review of data. A simple taxonomy of data publication methodologies is presented and evaluated, and the paper concludes with a discussion of dataset granularity, transience and semantics, along with a recommended human-readable citation syntax
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A linked data compliant framework for dynamic and web-scale consumption of web services
The While Semantic Web Services (SWS) research aims at automating Web service tasks such as discovery, orchestration and execution, its take-up is very limited so far. This is due to several reasons, such as inherent complexity of existing SWS frameworks and the considerable costs involved in creating correct SWS descriptions. In addition, while semantics are in use to enable tasks such as discovery, interaction between service consumers, providers and brokering environments is still not supported by semantic message descriptions. On the other hand, the Linked Data approach has produced a set of established principles for sharing and describing data, such as RDF as representation language and the integral use of dereferencable URIs. In this paper we propose to apply those principles to expose Web services and Web APIs and introduce a framework in which service registries as well as services contribute to the automation of service discovery, and hence, workload is distributed more efficiently. This is achieved by developing a Linked Data compliant Web services framework with that communicate with semi-centralised registries but compute their suitability for a given request themselves. All communications among different framework components are using RDF-based message protocols including service input and output. This framework aims at optimizing load balance and performance by dynamically assembling services at run time in a massively distributed Web environment
Mixed Reality Architecture: a dynamic architectural topology
Architecture can be shown to structure patterns of co-presence and in turn to be
structured itself by the rules and norms of the society present within it. This two-way
relationship exists in a surprisingly stable framework, as fundamental changes to
buildings are slow and costly. At the same time, change within organisations is
increasingly rapid and buildings are used to accommodate some of that change. This
adaptation can be supported by the use of telecommunication technologies, overcoming
the need for co-presence during social interaction. However, often this results in a loss
of accountability or ‘civic legibility’, as the link between physical location and social
activity is broken. In response to these considerations, Mixed Reality Architecture
(MRA) was developed. MRA links multiple physical spaces across a shared 3D virtual
world. We report on the design of MRA, including the key concept of the Mixed Reality
Architectural Cell, a novel architectural interface between architectural spaces that are
remote to each other. An in-depth study lasting one year and involving six office-based
MRACells, used video recordings, the analysis of event logs, diaries and an interview
survey. This produced a series of ethnographic vignettes describing social interaction
within MRA in detail. In this paper we concentrate on the topological properties of MRA.
It can be shown that the dynamic topology of MRA and social interaction taking place
within it are fundamentally intertwined. We discuss how topological adjacencies across
virtual space change the integration of the architectural spaces that MRA is installed in.
We further reflect on how the placement of MRA technology in different parts of an
office space (deep or shallow) impacts on the nature of that particular space. Both the
above can be shown to influence movement through the building and social interaction
taking place within it. These findings are directly relevant to new buildings that need to
be designed to accommodate organisational change in future but also to existing
building stock that might be very hard to adapt. We are currently expanding the system
to new sites and are planning changes to the infrastructure of MRA as well as its
interactional interface
Evaluating Knowledge Representation and Reasoning Capabilites of Ontology Specification Languages
The interchange of ontologies across the World Wide Web (WWW) and the cooperation among heterogeneous agents placed on it is the main reason for the development of a new set of ontology specification languages, based on new web standards such as XML or RDF. These languages (SHOE, XOL, RDF, OIL, etc) aim to represent the knowledge contained in an ontology in a simple and human-readable way, as well as allow for the interchange of ontologies across the web. In this paper, we establish a common framework to compare the expressiveness of "traditional" ontology languages (Ontolingua, OKBC, OCML, FLogic, LOOM) and "web-based" ontology languages. As a result of this study, we conclude that different needs in KR and reasoning may exist in the building of an ontology-based application, and these needs must be evaluated in order to choose the most suitable ontology language(s)
Heuristic Ranking in Tightly Coupled Probabilistic Description Logics
The Semantic Web effort has steadily been gaining traction in the recent
years. In particular,Web search companies are recently realizing that their
products need to evolve towards having richer semantic search capabilities.
Description logics (DLs) have been adopted as the formal underpinnings for
Semantic Web languages used in describing ontologies. Reasoning under
uncertainty has recently taken a leading role in this arena, given the nature
of data found on theWeb. In this paper, we present a probabilistic extension of
the DL EL++ (which underlies the OWL2 EL profile) using Markov logic networks
(MLNs) as probabilistic semantics. This extension is tightly coupled, meaning
that probabilistic annotations in formulas can refer to objects in the
ontology. We show that, even though the tightly coupled nature of our language
means that many basic operations are data-intractable, we can leverage a
sublanguage of MLNs that allows to rank the atomic consequences of an ontology
relative to their probability values (called ranking queries) even when these
values are not fully computed. We present an anytime algorithm to answer
ranking queries, and provide an upper bound on the error that it incurs, as
well as a criterion to decide when results are guaranteed to be correct.Comment: Appears in Proceedings of the Twenty-Eighth Conference on Uncertainty
in Artificial Intelligence (UAI2012
Affordances for learning in a non-linear narrative medium
A multimedia CD makes an impressive resource for the scholar-researcher, but students unfamiliar with the subject-matter may not always work so effectively with such a resource. Without any narrative structure, how does the novice cope? The paper describes how we are investigating the design features that 'afford' activities that generate learning: What are the design features that encourage students to practise the role of the scholar? What encourages them to explore, but also to reflect on their analysis of the data they find? What kind of learning takes place when students are allowed to explore at will? The paper goes on to compare the learning experiences of students using commercial CDs with those using material with contrasting designs, in an attempt to identify the design features that afford constructive learning activities. It concludes with an interpretation of the findings, comparing them with work in related educational media, and situating the findings in the context of a conversational framework for learning
Probabilistic Model Checking for Energy Analysis in Software Product Lines
In a software product line (SPL), a collection of software products is
defined by their commonalities in terms of features rather than explicitly
specifying all products one-by-one. Several verification techniques were
adapted to establish temporal properties of SPLs. Symbolic and family-based
model checking have been proven to be successful for tackling the combinatorial
blow-up arising when reasoning about several feature combinations. However,
most formal verification approaches for SPLs presented in the literature focus
on the static SPLs, where the features of a product are fixed and cannot be
changed during runtime. This is in contrast to dynamic SPLs, allowing to adapt
feature combinations of a product dynamically after deployment. The main
contribution of the paper is a compositional modeling framework for dynamic
SPLs, which supports probabilistic and nondeterministic choices and allows for
quantitative analysis. We specify the feature changes during runtime within an
automata-based coordination component, enabling to reason over strategies how
to trigger dynamic feature changes for optimizing various quantitative
objectives, e.g., energy or monetary costs and reliability. For our framework
there is a natural and conceptually simple translation into the input language
of the prominent probabilistic model checker PRISM. This facilitates the
application of PRISM's powerful symbolic engine to the operational behavior of
dynamic SPLs and their family-based analysis against various quantitative
queries. We demonstrate feasibility of our approach by a case study issuing an
energy-aware bonding network device.Comment: 14 pages, 11 figure
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