11,236 research outputs found
Development of an open-source platform for calculating losses from earthquakes
Risk analysis has a critical role in the reduction of casualties and damages due to earthquakes.
Recognition of this relation has led to a rapid rise in demand for accurate, reliable and flexible risk
assessment numerical tools and software. As a response to this need, the Global Earthquake Model
(GEM) started the development of an open source platform called OpenQuake, for calculating
seismic hazard and risk at different scales. Along with this framework, also several other tools to
support users creating their own models and visualizing their results are currently being
developed, and will be made available as a Modelers Tool Kit (MTK). In this paper, a description
of the architecture of OpenQuake is provided, highlighting the current data model, workflow of
the calculators and the main challenges raised when running this type of calculations in a global
scale. In addition, a case study is presented using the Marmara Region (Turkey) for the calculations, in which the losses for a single event are estimated, as well as probabilistic risk for a
50 years time span
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A component-based product line architecture for workflow management systems
This paper presents a component-based product line for workflow management systems. The process followed to design the product line was based on the Catalysis method. Extensions were made to represent variability across the process. The domain of workflow management systems has been shown to be appropriate to the application of the product line approach as there are a standard architecture and models established by a regulatory board, the Workflow Management Coalition. In addition, there is a demand for similar workflow management systems but with some different features. The product line architecture was evaluated with Rapide simulation tools. The evaluation was based on selected scenarios, thus, avoiding implementation issues. The strategy that has been used to populate the architecture and experiment with the product line is shown. In particular, the design of the workflow execution manager component is described
Case-based analysis in user requirements modelling for knowledge construction
Context: Learning can be regarded as knowledge construction in which prior knowledge and experience
serve as basis for the learners to expand their knowledge base. Such a process of knowledge construction
has to take place continuously in order to enhance the learnersâ competence in a competitive working
environment. As the information consumers, the individual users demand personalised information provision
which meets their own specific purposes, goals, and expectations.
Objectives: The current methods in requirements engineering are capable of modelling the common
userâs behaviour in the domain of knowledge construction. The usersâ requirements can be represented
as a case in the defined structure which can be reasoned to enable the requirements analysis. Such analysis
needs to be enhanced so that personalised information provision can be tackled and modelled. However,
there is a lack of suitable modelling methods to achieve this end. This paper presents a new
ontological method for capturing individual userâs requirements and transforming the requirements onto
personalised information provision specifications. Hence the right information can be provided to the
right user for the right purpose.
Method: An experiment was conducted based on the qualitative method. A medium size of group of users
participated to validate the method and its techniques, i.e. articulates, maps, configures, and learning content.
The results were used as the feedback for the improvement.
Result: The research work has produced an ontology model with a set of techniques which support the
functions for profiling userâs requirements, reasoning requirements patterns, generating workflow from
norms, and formulating information provision specifications.
Conclusion: The current requirements engineering approaches provide the methodical capability for
developing solutions. Our research outcome, i.e. the ontology model with the techniques, can further
enhance the RE approaches for modelling the individual userâs needs and discovering the userâs
requirements
Forum Session at the First International Conference on Service Oriented Computing (ICSOC03)
The First International Conference on Service Oriented Computing (ICSOC) was held in Trento, December 15-18, 2003. The focus of the conference ---Service Oriented Computing (SOC)--- is the new emerging paradigm for distributed computing and e-business processing that has evolved from object-oriented and component computing to enable building agile networks of collaborating business applications distributed within and across organizational boundaries. Of the 181 papers submitted to the ICSOC conference, 10 were selected for the forum session which took place on December the 16th, 2003. The papers were chosen based on their technical quality, originality, relevance to SOC and for their nature of being best suited for a poster presentation or a demonstration. This technical report contains the 10 papers presented during the forum session at the ICSOC conference. In particular, the last two papers in the report ere submitted as industrial papers
Formal Aspects of Grid Brokering
Coordination in distributed environments, like Grids, involves selecting the
most appropriate services, resources or compositions to carry out the planned
activities. Such functionalities appear at various levels of the infrastructure
and in various means forming a blurry domain, where it is hard to see how the
participating components are related and what their relevant properties are. In
this paper we focus on a subset of these problems: resource brokering in Grid
middleware. This paper aims at establishing a semantical model for brokering
and related activities by defining brokering agents at three levels of the Grid
middleware for resource, host and broker selection. The main contribution of
this paper is the definition and decomposition of different brokering
components in Grids by providing a formal model using Abstract State Machines
BSML: A Binding Schema Markup Language for Data Interchange in Problem Solving Environments (PSEs)
We describe a binding schema markup language (BSML) for describing data
interchange between scientific codes. Such a facility is an important
constituent of scientific problem solving environments (PSEs). BSML is designed
to integrate with a PSE or application composition system that views model
specification and execution as a problem of managing semistructured data. The
data interchange problem is addressed by three techniques for processing
semistructured data: validation, binding, and conversion. We present BSML and
describe its application to a PSE for wireless communications system design
Adaptive service discovery on service-oriented and spontaneous sensor systems
Service-oriented architecture, Spontaneous networks, Self-organisation, Self-configuration, Sensor systems, Social patternsNatural and man-made disasters can significantly impact both people and environments. Enhanced effect can be achieved through dynamic networking of people, systems and procedures and seamless integration of them to fulfil mission objectives with service-oriented sensor systems. However, the benefits of integration of services will not be realised unless we have a dependable method to discover all required services in dynamic environments. In this paper, we propose an Adaptive and Efficient Peer-to-peer Search (AEPS) approach for dependable service integration on service-oriented architecture based on a number of social behaviour patterns. In the AEPS network, the networked nodes can autonomously support and co-operate with each other in a peer-to-peer (P2P) manner to quickly discover and self-configure any services available on the disaster area and deliver a real-time capability by self-organising themselves in spontaneous groups to provide higher flexibility and adaptability for disaster monitoring and relief
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