967,170 research outputs found
Inferring Rankings Using Constrained Sensing
We consider the problem of recovering a function over the space of
permutations (or, the symmetric group) over elements from given partial
information; the partial information we consider is related to the group
theoretic Fourier Transform of the function. This problem naturally arises in
several settings such as ranked elections, multi-object tracking, ranking
systems, and recommendation systems. Inspired by the work of Donoho and Stark
in the context of discrete-time functions, we focus on non-negative functions
with a sparse support (support size domain size). Our recovery method is
based on finding the sparsest solution (through optimization) that is
consistent with the available information. As the main result, we derive
sufficient conditions for functions that can be recovered exactly from partial
information through optimization. Under a natural random model for the
generation of functions, we quantify the recoverability conditions by deriving
bounds on the sparsity (support size) for which the function satisfies the
sufficient conditions with a high probability as .
optimization is computationally hard. Therefore, the popular compressive
sensing literature considers solving the convex relaxation,
optimization, to find the sparsest solution. However, we show that
optimization fails to recover a function (even with constant sparsity)
generated using the random model with a high probability as . In
order to overcome this problem, we propose a novel iterative algorithm for the
recovery of functions that satisfy the sufficient conditions. Finally, using an
Information Theoretic framework, we study necessary conditions for exact
recovery to be possible.Comment: 19 page
Quality of information in the context of ambient assisted living
Série : Advances in Soft Computing, vol. 50With the use of new computational technologies and novel methodologies
for problem solving, recurring to the use of Group Decision Support Systems,
normally the problem of incomplete information is marginalized as if we were living
in an ideal world. Common sense tells us that in the precise time a decision is make
it is impossible to know all the information regarding to it, however decisions must
be made. What we propose, in the ambit of the VirtualECare project, is a possible
solution to decision making, through the use of Group Decision Support Systems,
aware of incomplete information but, even so, able to make decisions based in the
quality of the information and its source
Supporting Memorization and Problem Solving with Spatial Information Presentations in Virtual Environments
While it has been suggested that immersive virtual environments could provide benefits for educational applications, few studies have formally evaluated how the enhanced perceptual displays of such systems might improve learning. Using simplified memorization and problem-solving tasks as representative approximations of more advanced types of learning, we are investigating the effects of providing supplemental spatial information on the performance of learning-based activities within virtual environments. We performed two experiments to investigate whether users can take advantage of a spatial information presentation to improve performance on cognitive processing activities. In both experiments, information was presented either directly in front of the participant or wrapped around the participant along the walls of a surround display. In our first experiment, we found that the spatial presentation caused better performance on a memorization and recall task. To investigate whether the advantages of spatial information presentation extend beyond memorization to higher level cognitive activities, our second experiment employed a puzzle-like task that required critical thinking using the presented information. The results indicate that no performance improvements or mental workload reductions were gained from the spatial presentation method compared to a non-spatial layout for our problem-solving task. The results of these two experiments suggest that supplemental spatial information can support performance improvements for cognitive processing and learning-based activities, but its effectiveness is dependent on the nature of the task and a meaningful use of space
A review of GIS-based information sharing systems
GIS-based information sharing systems have been implemented in many of England and Wales' Crime and Disorder Reduction Partnerships (CDRPs). The information sharing role of these systems is seen as being vital to help in the review of crime, disorder and misuse of drugs; to sustain strategic objectives, to monitor interventions and initiatives; and support action plans for service delivery. This evaluation into these systems aimed to identify the lessons learned from existing systems, identify how these systems can be best used to support the business functions of CDRPs, identify common weaknesses across the systems, and produce guidelines on how these systems should be further developed. At present there are in excess of 20 major systems distributed across England and Wales. This evaluation considered a representative sample of ten systems. To date, little documented evidence has been collected by the systems that demonstrate the direct impact they are having in reducing crime and disorder, and the misuse of drugs. All point to how they are contributing to more effective partnership working, but all systems must be encouraged to record how they are contributing to improving community safety. Demonstrating this impact will help them to assure their future role in their CDRPs. By reviewing the systems wholly, several key ingredients were identified that were evident in contributing to the effectiveness of these systems. These included the need for an effective partnership business model within which the system operates, and the generation of good quality multi-agency intelligence products from the system. In helping to determine the future development of GIS-based information sharing systems, four key community safety partnership business service functions have been identified that these systems can most effectively support. These functions support the performance review requirements of CDRPs, operate a problem solving scanning and analysis role, and offer an interface with the public. By following these business service functions as a template will provide for a more effective application of these systems nationally
Determining prerogative by factors of significance, logical or programming controller
Advances in information technology
design computer systems and networks helped to
deepen the study of the processes that can lead to loss
of integrity, confidentiality or availability of
information or even its destruction. Information
technology protect the confidentiality of information
in computer systems and networks for the present
time by following directions - SDN (software-defined
networking) and ACI (Application Centric
Infrastructure). Given the trends of information
technology and approaches to problem-solving
information security important task is to determine
the appropriate direction through the use of a decision
support system to further improve the selected
information technology. Using decision support
system conducted experimental verification of
analytical model that allows you to answer about the
merits of one or another system chosen key
measurements and metrics, identify the strengths and
weaknesses of the systems that will allow for further
development and open up new opportunities
The innovation of Multiview3 for development professionals
The Multiview Methodology for Information Systems Development has never been a widely used or mass-market approach. It has always had a small user base, a localised approach to a global issue: coherent IS development. This paper concerns the underreported innovation of the Multiview3 methodology for Information systems analysis, design and development – specifically designed for non-specialists working in developing countries. The innovation emerged from the identification of a methodological ‘gap’ in support for non-specialists struggling with Information Systems problem structuring challenges. The Multiview3 story tells us how IS methodology can be innovated to address the needs of users. This version of Multiview is argued to be theoretically distinct from previous versions in terms of its focus (developing countries) and application (problem solving and co-learning in practice)
Determining prerogative by factors of significance, logical or programming controller
Advances in information technology
design computer systems and networks helped to
deepen the study of the processes that can lead to loss
of integrity, confidentiality or availability of
information or even its destruction. Information
technology protect the confidentiality of information
in computer systems and networks for the present
time by following directions - SDN (software-defined
networking) and ACI (Application Centric
Infrastructure). Given the trends of information
technology and approaches to problem-solving
information security important task is to determine
the appropriate direction through the use of a decision
support system to further improve the selected
information technology. Using decision support
system conducted experimental verification of
analytical model that allows you to answer about the
merits of one or another system chosen key
measurements and metrics, identify the strengths and
weaknesses of the systems that will allow for further
development and open up new opportunities
Testing an Integrity-Checking DSS Component for Organizational Memory Building
Organizational Memory (OM) has become a critical component of organizations attempting to maintain a competitive advantage. The ability to retrieve accurate information, and interpret it from different perspectives, will both facilitate efficient problem solving and support efficient organizational learning. This research examines the effect of an informationbuilding and decision aid. The results indicate that the system positively affects OM by promoting user-entered knowledge bases with more accurate statements. However, the system did not significantly improve the ability of the users to solve a problem. These findings have important implications for designing information systems to support and expand OM while increasing the organization’s capacity to learn and solve problems
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