102 research outputs found
Fine-Grained Authorization for Job and Resource Management Using Akenti and the Globus Toolkit
As the Grid paradigm is adopted as a standard way of sharing remote resources
across organizational domains, the need for fine-grained access control to
these resources increases. This paper presents an authorization solution for
job submission and control, developed as part of the National Fusion
Collaboratory, that uses the Globus Toolkit 2 and the Akenti authorization
service in order to perform fine-grained authorization of job and resource
management requests in a Grid environment. At job startup, it allows the system
to evaluate a user's Resource Specification Language request against
authorization policies on resource usage (determining how many CPUs or memory a
user can use on a given resource or which executables the user can run).
Furthermore, based on authorization policies, it allows other virtual
organization members to manage the user's job.Comment: CHEP03, La Jolla, Mar 24-27, TUB2006, Grid Security, 7 pages, 5
figure
"Suitable" for New Zealand : the impact of inter-war migration on an emergent nationalism, 1919-39.
This thesis considers aspects of both the formal and informal perspectives
of immigration to New Zealand, looking at legislation and the attitudes and the
messages created and sent within a society about migration and their
implications for national identity, a perpetually evolving concept. It proceeds
from the premise that the notion of protection embodied in nationalism
conceivably involved a reluctance to allow immigration in large numbers for
fear that it would endanger employment and living standards, and a concern
that the 'racial purity' of the majority population would be impaired.
The main body is divided into sections, which indicate a racial division between (those who could be considered "white" English-speaking Europeans,
and those who could not), and also two contrasting viewpoints. Section One
presents a study of both the policy and practise of British immigration in the
interwar period. How New Zealand citizens saw their country's role within the
international situation was as important as the perceived skills of individual
migrants. These chapters identify the three main types of immigrant
considered suitable, and their adaption to the New Zealand environment.
Migrants were all different but they were shaped equally by the need to
frame New Zealand's cultural identity. For the purposes of Section Two the
focal point is on those migrants who were conceptually viewed as unsuitable.
It addresses the process by which “aliens" were defined, and unwillingness of
policy-makers to actively help “ aliens" to become assimilated. The implications
of a preconceived idea of The Other are also examined. Ultimately it concludes
that the process of alien immigrant selection on a case by case basis failed to
appreciate the changing dynamics of the international situation. While the
restrictive policies of the 1930s reflected economic concerns, their very rigidity
could not guarantee the “suitability" of immigrants
Modularity for Large Virtual Reality Applications
International audienceThis paper focuses on the design of high performance VR applications. These applications usually involve various I/O devices and complex simulations. A parallel architecture or grid infrastructure is required to provide the necessary I/O and processing capabilities. Developing such applications faces several difficulties, two important ones being software engineering and performance issues. We argue that application modularity is a key concept to help the developer handle the complexity of these applications. We discuss how various approaches borrowed from other existing works can be combined to significantly improve the modularity of VR applications. This led to the development of the FlowVR middleware that associates a data-flow model with a hierarchical component model. Different case studies are presented to discuss the benefits of the approach proposed
A National Collaboratory to Advance the Science of High Temperature Plasma Physics for Magnetic Fusion
This report summarizes the work of the National Fusion Collaboratory (NFC) Project to develop a persistent infrastructure to enable scientific collaboration for magnetic fusion research. The original objective of the NFC project was to develop and deploy a national FES Grid (FusionGrid) that would be a system for secure sharing of computation, visualization, and data resources over the Internet. The goal of FusionGrid was to allow scientists at remote sites to participate as fully in experiments and computational activities as if they were working on site thereby creating a unified virtual organization of the geographically dispersed U.S. fusion community. The vision for FusionGrid was that experimental and simulation data, computer codes, analysis routines, visualization tools, and remote collaboration tools are to be thought of as network services. In this model, an application service provider (ASP provides and maintains software resources as well as the necessary hardware resources. The project would create a robust, user-friendly collaborative software environment and make it available to the US FES community. This Grid's resources would be protected by a shared security infrastructure including strong authentication to identify users and authorization to allow stakeholders to control their own resources. In this environment, access to services is stressed rather than data or software portability
Crowdcloud: A Crowdsourced System for Cloud Infrastructure
The widespread adoption of truly portable,
smart devices and Do-It-Yourself computing platforms
by the general public has enabled the rise of new network
and system paradigms. This abundance of wellconnected,
well-equipped, affordable devices, when combined
with crowdsourcing methods, enables the development
of systems with the aid of the crowd. In this
work, we introduce the paradigm of Crowdsourced Systems,
systems whose constituent infrastructure, or a significant
part of it, is pooled from the general public by
following crowdsourcing methodologies. We discuss the
particular distinctive characteristics they carry and also
provide their “canonical” architecture. We exemplify
the paradigm by also introducing Crowdcloud, a crowdsourced
cloud infrastructure where crowd members can
act both as cloud service providers and cloud service
clients. We discuss its characteristic properties and also
provide its functional architecture. The concepts introduced
in this work underpin recent advances in the areas
of mobile edge/fog computing and co-designed/cocreated
systems
Recommended from our members
A National Collaboratory to Advance the Science of High Temperature Plasma Physics for Magnetic Fusion
This report summarizes the work of the National Fusion Collaboratory (NFC) Project to develop a persistent infrastructure to enable scientific collaboration for magnetic fusion research. The original objective of the NFC project was to develop and deploy a national FES Grid (FusionGrid) that would be a system for secure sharing of computation, visualization, and data resources over the Internet. The goal of FusionGrid was to allow scientists at remote sites to participate as fully in experiments and computational activities as if they were working on site thereby creating a unified virtual organization of the geographically dispersed U.S. fusion community. The vision for FusionGrid was that experimental and simulation data, computer codes, analysis routines, visualization tools, and remote collaboration tools are to be thought of as network services. In this model, an application service provider (ASP provides and maintains software resources as well as the necessary hardware resources. The project would create a robust, user-friendly collaborative software environment and make it available to the US FES community. This Grid's resources would be protected by a shared security infrastructure including strong authentication to identify users and authorization to allow stakeholders to control their own resources. In this environment, access to services is stressed rather than data or software portability
CloVR: A virtual machine for automated and portable sequence analysis from the desktop using cloud computing
Next-generation sequencing technologies have decentralized sequence acquisition, increasing the demand for new bioinformatics tools that are easy to use, portable across multiple platforms, and scalable for high-throughput applications. Cloud computing platforms provide on-demand access to computing infrastructure over the Internet and can be used in combination with custom built virtual machines to distribute pre-packaged with pre-configured software. We describe the Cloud Virtual Resource, CloVR, a new desktop application for push-button automated sequence analysis that can utilize cloud computing resources. CloVR is implemented as a single portable virtual machine (VM) that provides several automated analysis pipelines for microbial genomics, including 16S, whole genome and metagenome sequence analysis. The CloVR VM runs on a personal computer, utilizes local computer resources and requires minimal installation, addressing key challenges in deploying bioinformatics workflows. In addition CloVR supports use of remote cloud computing resources to improve performance for large-scale sequence processing. In a case study, we demonstrate the use of CloVR to automatically process next-generation sequencing data on multiple cloud computing platforms. The CloVR VM and associated architecture lowers the barrier of entry for utilizing complex analysis protocols on both local single- and multi-core computers and cloud systems for high throughput data processing.https://doi.org/10.1186/1471-2105-12-35
- …