The increasing integration of decentralized electrical sources is attended by problems with power quality, safe grid operation and grid stability. The concept of the Virtual Synchronous Machine (VISMA) [1] discribes an inverter to particularly connect renewable electrical sources to the grid that provides a wide variety of static an dynamic properties they are also suitable to achieve typical t...

Meteorology is one of the main application areas of high performance computing (HPC) technologies, it is impossible for efficient and accurate weather forecasting and meteorological services without the support of HPC resources. As a kind of networked HPC application environment, meteorological computational Grid makes an integration of diverse computing resources using the Grid technology, pro...

to scattered radiation. This technology improves the quality of images taken without an anti-scatter grid at bedside or emergency radiography. Conventionally, grids are commonly used to reduce the influence of scattered radiation. However, due to the positioning difficulties, images are often acquired without a grid for mobile examinations, which results in images with low contrast. Virtual Gri...

In Germany’s D-Grid project numerous Grid communities are working together to providing a common overarching Grid infrastructure. The major aims of D-Grid are the integration of existing Grid deployments and their interoperability. The challenge in this endeavor lies in the heterogeneity of the current implementations: Three Grid middleware stacks and different Virtual Organization management a...

A Virtual Organization (VO) is a dynamic collection of distributed resources that are shared by a dynamic collection of users from one or more physical organizations. As Grid Computing technology is starting to facilitate truly large-scale VOs, issues are being raised regarding the purpose, architecture and operational mechanism of the VO. The emerging approach is essentially to define the VO a...

To enable Grid scalability and growth, a usage model has evolved whereby resource providers make resources available not to individual users directly, but rather to larger units, called virtual organizations. In this paper, we describe abstractions that allow resource providers to delegate the usage of remote resources dynamically to virtual organizations in applicationindependent ways, and pre...

Grid computing allows one to access, utilise and manage heterogeneous resources in virtual organisations across multiple domains and institutions. The formation and operation of virtual organisations involve establishing trust among their members and reputation is one measure by which such trust can be quantified and reasoned about. This paper presents a reputation model for Grid-based virtual ...

The service oriented architecture of grid computing has been thoughtfully engineered to achieve a service level virtualization: not only should a grid be a virtual machine (also known as a virtual organization, VO) of unbounded computational power and storage capacity, but also should the virtual machine be serviceable in all circumstances independent from serviceability of any of its component...