Search results for "Systems architecture"
showing 10 items of 227 documents
Through a Glass, Darkly
2013
Political actors increasingly use the microblogging service, Twitter, for the organization, coordination, and documentation of collective action. These interactions with Twitter leave digital artifacts that can be analyzed. In this article, we look at Twitter messages commenting on one of the most contentious protests in Germany’s recent history, the protests against the infrastructure project Stuttgart 21. We analyze all messages containing the hashtag #s21 that were posted between May 25, 2010, and November 14, 2010, by the 80,000 most followed Twitter users in Germany. We do this to answer three questions: First, what distinguishes events that resulted in high activity on Twitter from ev…
A model of the filling process of an intermittent distribution network
2010
In many countries, private tanks are acquired by users to reduce their vulnerability to intermittent supply. The presence of these local reservoirs modifies the user demand pattern and usually increases user water demand at the beginning of the service period depending on the tank filling process. This practice is thus responsible for the inequality that occurs among users: those located in advantaged positions of the network are able to obtain water resources soon after the service period begins, while disadvantaged users have to wait much longer, after the network is full. This dynamic process requires the development of ad hoc models in order to obtain reliable results. This paper discus…
Towards Concrete Syntax Based Find for Graphical Domain Specific Languages
2019
One of the main reasons why Model-Driven Engineering (MDE) technologies including Domain-specific modelling languages (DSML) have not reached the expected acceptance in the industry is a poor tool support. One of the features with a limited support even in commercial modelling tools is search (find). Typically, MDE tools support only a simple keyword-based textual search functionality. The same is true for the tools built using Domain-specific language (DSL) tool definition frameworks. It is proposed to provide the concrete syntax-based find functionality as a service of a DSL tool definition framework. The find diagrams are defined in a concrete syntax of a DSL. A definition of a DSL is us…
Evaluating Infrastructure Alternatives for Regional Water Supply Systems by Model-assisted Cost-benefit Analysis – A Case Study from Apulia, Italy
2014
The main challenge associated to regional water supply systems planning lies in understanding the best infrastructure alternatives to improve service given a certain configuration of the resources system. While cost-effectiveness assessments are still widespread in this type of analyses, they do not account for the fact that, especially in mature systems, service improvements tend to follow the law of marginal diminishing returns, so that a cost – benefit assessment should be preferable. Both costs and benefits can be organized into a cost-benefit analysis (CBA) framework. In a complex system, a model reproducing its topology and characteristics better describes the impacts of the alternati…
Mobile solution for better reading instruction in rural Africa
2015
GraphoGame Teacher Training Service is a mobile-based solution for providing teachers with scientifically validated pedagogical training in literacy instruction. In many African countries teachers currently have insufficient knowledge to teach literacy in local languages and learning materials are scarce, especially for children with learning difficulties. As part of the GraphoWorld network, CAPOLSA/University of Zambia is developing new mobile-based method for providing in-service training for teachers in literacy instruction and assisting children with learning difficulties. GraphoGame Teacher Training Service was piloted in October 2014 in rural Zambia. An orientative workshop was given …
Deliberate and Emergent Changes on a Way Towards Electronic Document Management
2011
A unit of Fortum Service Ltd. operates and maintains the Rauhalahti power plant in Central Finland. In 1996-97, the unit launched a project pursuing coordinated organizationwide electronic document management (EDM). This case follows deliberate and emergent changes related to document management in the organization since the initiation of the project until February 2000. New information technologies were adopted, and responsibilities for continuous improvement of EDM were assigned. The continuous improvement was implemented as an extension of the ISO 9002 quality system earlier adopted for process improvement. The case shows that a shift from the paper-based era towards organizationwide EDM…
Cultivating the Installed Base: The Introduction of e-Prescription in Greece
2017
In this chapter we explore the surprisingly swift deployment of a national e-prescription service in Greece. We position e-prescribing within the overall Greek health system and we describe how the new electronic service evolved to inscribe specific prescribing policies, to provide clinical decision support and to facilitate the processes and roles of policy and financing stakeholders. We identify how a series of pragmatic decisions allowed building upon a “good-enough” installed base by exploiting its latent potential without perpetuating all of its weaknesses, and by being responsive to exogenous shifts. These tactical decisions, were supported by a favourable and enabling combination of …
EV-planning: Electric vehicle itinerary planning
2014
International audience; In the latest few years, lot of efforts have been done to pave the way to sustainable mobility, in order to solve pollution problems and fuel shortage. The use of electric vehicles (EV) is considered as one of the best ecologic and economic solution. However, autonomy barriers and limitations slow the progress and the deployment of this technology. In this paper, we propose an advanced electric vehicles' fleet management architecture. This architecture considers the most important factors that can affect the traveling mode of electric vehicles, in order to offer different services to fleet management companies for an efficient monitoring and management of their fleet…
Sensitivity of Regional Water Supply Systems Models to the Level of Skeletonization – A Case Study from Apulia, Italy
2015
AbstractSimulation models supported by state-of-the-art software packages are nowadays available to explore operation rules of regional water supply systems or to select structural alternatives for improving long-term service performances.Given the, sometimes high, complexity of these systems, model calibration can become a lengthy procedure and many runs are necessary before obtaining convincing results. However, even after calibration, depending on system's complexity and the number of time steps investigated, a single run can take up to several minutes, even on state-of-the-art computers, so that simulation time can become a true bottleneck if such models are to be coupled with metaheuri…
Measuring the eco-efficiency of wastewater treatment plants under data uncertainty
2018
Abstract Eco-efficiency assessment is a useful tool for improving the sustainability of wastewater treatment plants (WWTPs). However, it is a complex task that requires the integration of several performance indicators into a single index. Data envelopment analysis (DEA) is established as a highly effective methodology for achieving this as it permits the integration of the service value, resource consumption and environmental impact variables as the desirable outputs, inputs and undesirable outputs, respectively. However, traditional DEA models omit uncertainties in the data that are likely to result in biased conclusions. This study pioneers the assessment of the eco-efficiency of WWTPs w…