Use of renewable and non-renewable sources for distributed energy generation is more efficient than using only one of them standalone. For such distribution system stand-alone grid is considered having no co-ordinatio...
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ISBN:
(纸本)9781509066216
Use of renewable and non-renewable sources for distributed energy generation is more efficient than using only one of them standalone. For such distribution system stand-alone grid is considered having no co-ordination with conventional grid The proposed system is connecting outputs of different renewable sources to grid via Radio Frequency (RF) communication module. The actual working mechanism of RF communication module is to match phase angle of AC output generated from renewable sources, and in turn combining matching power information of these outputs into stand-alone smart grid Matching phase angles of different outputs from renewable sources, plays extremely crucial role, otherwise grid and other circuitry will get hit by unforeseen damage and casualties may occur. Furthermore, this paper demonstrates the research in area of energy grid with prototype model being build and related findings are shared along with insightful statistically processed real time system data analysis. This paper proposes more in depth insights into subject matter with continuation to our previous paper [1].
The purpose of this case study is to develop a performance model for an enterprise grid for performance management grid capacity planning(1). The target environment includes,grid applications such as health-care arid ...
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ISBN:
(纸本)9780889866386
The purpose of this case study is to develop a performance model for an enterprise grid for performance management grid capacity planning(1). The target environment includes,grid applications such as health-care arid financial services where the data is located primarily within the resources of a worldwide corporation. The approach is to build a discrete event simulation model for a representative work-flow grid. Five work-flow classes, found using a customized k-means clustering algorithm characterize the workload of the grid. Analyzing the gap between the simulation arid measurement data validates the model. The case study demonstrates that the simulation model can be used to predict the V a given a workload forecast. The,rid system performance model is also used to evaluate alternative scheduling strategies. The simulation model is flexible arid easily incorporates several system details.
gridcomputing, was developed by computer scientists in the mid 1990's based on ease of use and access geographically distributed resources which are dynamic and heterogeneous for solving difficult problems. These...
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ISBN:
(纸本)9781467385879
gridcomputing, was developed by computer scientists in the mid 1990's based on ease of use and access geographically distributed resources which are dynamic and heterogeneous for solving difficult problems. These distributed resources are owned by different organizations. gridcomputing provides a framework for parallel/distributedcomputing. For developing a grid, low-level services (secure access management of resources) and high-level services (application development and scheduling) should be developed. Dynamic nature of resources in grid architecture is the reason for varied load on resources. So for better management of resources, the scheduling concept comes into account. Scheduling means order of jobs which satisfy the metrics like user's satisfaction and completion time & so on. Better scheduling policy in gridcomputing improves performance, cost of computation, load balancing and increase reliability and availability of resources. This paper presents various approaches for allocation of resources in gridcomputing environment. This paper ends up with summary of some existing scheduling approaches by taking into account various metrics used to verify usefulness of existing technique.
The two main threads in distributedcomputing that recently show noticeable progress are gridcomputing and the development of Web-based services. It is our opinion that the adoption of the standards fostered by the w...
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ISBN:
(纸本)1892512459
The two main threads in distributedcomputing that recently show noticeable progress are gridcomputing and the development of Web-based services. It is our opinion that the adoption of the standards fostered by the web-service community could improve the level of usability and interoperability of grid systems and lead to the development of metacomputing systems based on reusable, interoperable components. Up to now the adoption of Web Services in grid projects has been limited to ancillary services and has never penetrated the core computational model that is still tightly tied to MPI and PVM. This is mainly due to the fact that Web Services use by default the SOAP protocol which is extremely ill suited to computational science applications. In this paper we show how we leveraged the Web Service Invocation Framework to develop a new high performance binding based on XDR coding.
By GMount, non privilege users can easily and quickly build ad-hoc distributed file systems on any machines reachable via SSH. In the wide-area grid environments, it can scale to hundreds of nodes and works with NAT o...
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ISBN:
(纸本)9781424425785
By GMount, non privilege users can easily and quickly build ad-hoc distributed file systems on any machines reachable via SSH. In the wide-area grid environments, it can scale to hundreds of nodes and works with NAT or firewall. Given the network topology, the metadata operations of file system are locality-aware. GMount can be effortlessly deployed in multiple clusters without superuser privilege. In this paper, we present the design and implementation of GMount, and shows its viability in a large scale grid platform with over 300 nodes spread across 11 clusters.
grid systems at different levels have already been constructed around the world to provide users an easy way of accessing/integrating distributedcomputing, data and other resources. Portal layer is on the top of typi...
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ISBN:
(纸本)0769526950
grid systems at different levels have already been constructed around the world to provide users an easy way of accessing/integrating distributedcomputing, data and other resources. Portal layer is on the top of typical three layers in grid system and provides presentation interface to the end-users. Portlets as executing components in portal layer usually access a specific grid middleware rather than multi grid middlewares. A new grid system is implemented in this paper. It follows typical three layer structure of grid system. By using UDDI registry, grid Portlets in the portal layer can select services interfaces and find out suitable grid middleware. Abstraction and Business Logics which are Java CoG-based in service layer will map to suitable Globus Toolkit middlewares. The end-users can use the grid Portlets to access GT2, GT3 or GT4 middleware.
DNA sequence assembly is a fundamental part of biological computing. However, most of the large-scale sequence assemblies require intensive computing power and huge storage. To speed up the assembly process, we here p...
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ISBN:
(纸本)0769526950
DNA sequence assembly is a fundamental part of biological computing. However, most of the large-scale sequence assemblies require intensive computing power and huge storage. To speed up the assembly process, we here propose a method for large-scale DNA sequence assembly by using computinggrid The central idea of our method is to first cluster the input of fragment set into many non-intersected subsets using k-mers and then to distribute them to all nodes of the grid-computing system. Our method has accuracy of more than 92% on the test data sets under the simulated grid-computing system but costing shorter time and lower storage. Our method can efficiently process large-scale DNA sequence assembly by taking advantage of huge storage and computing capacity of computing gird.
The capability to support resource sharing between different organizations and high-level performance are noteworthy features of gridcomputing. Applications require significant design effort and complex coordination ...
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The capability to support resource sharing between different organizations and high-level performance are noteworthy features of gridcomputing. Applications require significant design effort and complex coordination of resources to define, deploy and execute components on heterogeneous and often unknown resources. A common trend today aims at diffusing workflow management techniques to reduce the complexity of grid systems through model-driven approaches that significantly simplify application design through the composition of distributed services often belonging to different organizations. With this approach, the adoption of efficient workflow enactors becomes a key aspect to improve efficiency through run-time optimizations, so reducing the burden for the developer, who is only responsible of defining the functional aspects of complex applications since he/she has only to identify the activities that characterize the application and the causal relationships among them. This paper focuses on performance improvements of grid workflows by presenting a new pattern for workflow design that ensures activity pre-scheduling at run-time through a technique that generates fine-grained concurrency with a couple of concepts: asynchronous invocation of services and continuation of execution. The technique is implemented in a workflow enactment service that dynamically optimizes process execution with a very limited effort for application developer. (C) 2008 Elsevier B.V. All rights reserved.
Despite the recent advances in access control approaches applicable to gridcomputing, there remain issues that impede the development of effective access control for grid applications. Amongst them are the lack of co...
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ISBN:
(纸本)0769524052
Despite the recent advances in access control approaches applicable to gridcomputing, there remain issues that impede the development of effective access control for grid applications. Amongst them are the lack of context-based models for access control, and reliance on identity or capability-based access control schemes. In this paper, we propose RCBAC model which extends the RBAC with context constraints. The RCBAC mechanisms dynamically grant and adapt permissions to users based on a set of contextual information collected from the grid environments, while retaining the advantages of RBAC model.
grid is a collection of distributed resources available over a local or wide area networks that appear to an end user or application as large virtual system. The implementation of individual application on grid promis...
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ISBN:
(纸本)0769520332
grid is a collection of distributed resources available over a local or wide area networks that appear to an end user or application as large virtual system. The implementation of individual application on grid promises performance benefits over that achievable at a single site for many resource-intensive application. However, with the emergency of OGSA, scheduling issues face new challenges in the new grid environment. Although higher-level abstraction makes resources encapsulated in a uniform fashion, it also leads to slower response in the process of execution. A new scheduling mechanism is needed to exploit characteristics of OGSA. In this paper, we put forward an effective instance-based application scheduling mechanism, implemented in Globus Toolkit 3. Good performance, best resource management and well lifecycle control in this mechanism can also be guaranteed.
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