With the development of gridtechnology, grid gains more popularity that ever and a variety of grid middlewares come into being. However, most of grid middlewares are developed by their own, and it's not easy to i...
详细信息
With the development of gridtechnology, grid gains more popularity that ever and a variety of grid middlewares come into being. However, most of grid middlewares are developed by their own, and it's not easy to interoperate these grid platforms. Existing grid interoperability projects mainly resorts to case-by-case mechanism, which is simple but of poor scalability. Job management is the core and the most complex components of gridsystem. To realize the interoperability of heterogeneous grids, the interoperation of heterogeneous job managements must be addressed In the paper, a plugin based job interoperation mechanism for heterogeneous gridsystems, called PBJIM, is proposed, which is based on the idea of virtualization and plug-in *** are two well-established gridsystems in China,Chinagrid and China National grid, and they are built with two different grid middlewares, CGSP and VEGA. Via PBJIM, the interoperation of job management of these two gridsystems is achieved.
This paper proposes a grid-based Distributed Simulation Platform (GDSP). It is designed to break the limitation of legacy simulation supporting platform and to meet new requirements from large-scale, distributed, and ...
详细信息
This paper proposes a grid-based Distributed Simulation Platform (GDSP). It is designed to break the limitation of legacy simulation supporting platform and to meet new requirements from large-scale, distributed, and complicated systems. Simulation services are encapsulated by using web servicestechnology, and they are basic elements of GDSP. With gridtechnology, GDSP enables users to share, access, and operate remote resource transparently. It is also easier to organize and manage simulation resources. GDSP improves the capability of fault tolerance and provides mechanism of using simulation resources securely. The research result shows that through this management mechanism, multiple users can share and monitor RTI resources, and manage the simulation collaboratively and effectively. At the same time, the impact on real time of RTI caused by the system is minimum.
Peer-to-peer (P2P) system can support service for lots of end users with little hardware investment, which suits for the efforts to lower down the service cost for multiplayer online games (MOG). In this paper, we int...
详细信息
Peer-to-peer (P2P) system can support service for lots of end users with little hardware investment, which suits for the efforts to lower down the service cost for multiplayer online games (MOG). In this paper, we introduce PKTown, a P2P middleware inserted into Star Craft and the network layer. PKTown captures all packets generated by Star Craft. We apply application layer multicast (ALM) to transmit the broadcast packets through overlay network. PKTown extends the LAN game experiences to players belong to different LAN. We design a k-regular random overlay network based on game specific requirements analysis. No change is made on binary code of Star Craft. Preliminary test results show that PKTown works well and supports other MOG in the same way. Our contribution is to provide a new game experience method with little hardware investment.
gridcomputing emerges as an effective technology to couple geographically distributed resources and solve large-scale computational problems in wide area networks. There are several popular grid platforms, such as UN...
详细信息
ISBN:
(纸本)9780769530482;0769530486
gridcomputing emerges as an effective technology to couple geographically distributed resources and solve large-scale computational problems in wide area networks. There are several popular grid platforms, such as UNICORE and Globus Toolkit. Many famous grid projects are constructed with these platforms, each of which manages different distributed resources. In order to aggregate resources managed by different grid platforms, it is necessary to implement the interoperation among these grid platforms. Security interoperation is one of key issues for the interoperation. CGSP (Chinagrid Support Platform) and VEGA are two popular grid platforms in China. To achieve security interoperation between these two platforms, four mapping policies, including user-user mapping, user-agora mapping, role-user mapping, role-agora mapping, are proposed in this paper. The security interoperation process is proposed based on SAML specification and the mapping policies. We also analyze the flexibility of mapping policies and the security of the interoperation process.
gridcomputing is becoming more and more attractive for coordinating large-scale heterogeneous resource sharing and problem solving. Of particular interest for effective gridcomputing is a software provisioning mecha...
详细信息
gridcomputing is becoming more and more attractive for coordinating large-scale heterogeneous resource sharing and problem solving. Of particular interest for effective gridcomputing is a software provisioning mechanism. We propose a highly available dynamic deployment infrastructure, HAND, based on the Java Web services core of Globus toolkit 4. HAND provides capability, availability, and extensibility for dynamic deployment of Java Web services in dynamic grid environments. We identify the factors that have impact to dynamic deployment in static and dynamic environments. We also present the design, analysis, implementation, and evaluation of two different approaches to dynamic deployment (service level and container level), and examine the performance of alternative data transfer protocol for service implementations. Our results demonstrate that HAND can deliver significantly improved availability and performance relative to other approaches
It now becomes a trend to implement the interconnections between resources as well as services in ubiquitous systems. Attribute-based authorization mechanisms, protocols and systems are gaining in popularity, such as ...
详细信息
It now becomes a trend to implement the interconnections between resources as well as services in ubiquitous systems. Attribute-based authorization mechanisms, protocols and systems are gaining in popularity, such as SAML, XACML, Shibboleth, etc. However, their management efficiency could be further improved. The Role-based Access Control (RBAC) mechanism is widely accepted as a general mechanism for authorization management. However, RBAC is still not flexible enough to address various application scenarios in ubiquitous systems. We propose a new architecture for access control in ubiquitous systems that impose attribute and status constraints on the RBAC model, which can significantly enhance the generality and flexibility of authorization by integrating the advantages of RBAC and attributed- based access control models. Moreover, the state mechanism proposed in this architecture captures the states of the authorization elements so as to reflect the outcomes of the authorization control. Finally, we analyze the flexibility and generality of this architecture in ubiquitous systems.
VCA (virtual client access) based grid information integration strategy is proposed in this paper that brings forward one efficient application framework with loosely coupled architecture. It encapsulates the virtual ...
详细信息
VCA (virtual client access) based grid information integration strategy is proposed in this paper that brings forward one efficient application framework with loosely coupled architecture. It encapsulates the virtual clients that are realized based on the API of the information systems as gridservices to enable the grid can access the information systems as real client. VCA mode can be combined with local access control and task management seamlessly, and solve the resource conflicts between grid and local users so as to support the information sharing and cooperation widely and efficiently. The experiment shows that VCA modes can support the information sharing and cooperation widely and efficiently.
In grid, it is an important strategy that using multicast to realize the large-scale information resource sharing. However, it is very difficult to ensure the security of multicast. In this paper, based on the basic p...
详细信息
In grid, it is an important strategy that using multicast to realize the large-scale information resource sharing. However, it is very difficult to ensure the security of multicast. In this paper, based on the basic principles of the centralized key distributed strategy and the distributed key distribution strategy, according to the multicast mechanism in grid, considering the dynamic factors of multicast members, we present the member hierarchy method for key distribution, the member discovery protocol, the clustering protocol and the key distribution strategy, thus constituting the key distribution strategy of security multicast in grid. In order to validate the feasibility and the availability of this strategy, a simulation experiment is done. The results show that it is feasible and efficient to ensure the security multicast in grid.
暂无评论