This paper describes a new prolocol for authentication in Peer-to-Peer systems. The protocol has been designed to meet specialized requirements of P2P systems, such as lack of direct communication between peers or req...
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ISBN:
(纸本)0769524052
This paper describes a new prolocol for authentication in Peer-to-Peer systems. The protocol has been designed to meet specialized requirements of P2P systems, such as lack of direct communication between peers or requirements for controlled anonymity. At the same time, a P2P authentication protocol must be resistant to spoofing, eavesdropping and playback, and man-in-the-middle attacks. The protocol is studied for a model P2P storage system that needs to implement file access rights.
In this paper, we propose a security management middleware in ubiquitous computing environments. This security management should be application-oriented security and provides user-centric security. This middleware pro...
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ISBN:
(纸本)0769524052
In this paper, we propose a security management middleware in ubiquitous computing environments. This security management should be application-oriented security and provides user-centric security. This middleware provides the services for user or administrator to define security policies which can reflect dynamic context and trust management. We define a new security specification policy language for policy management. It also provides management services which can monitor and control the managed objects and sensors for the domain security management.
Locomotive-track coupling dynamical simulation has made good achievements([1][2]). However, a problem, how to improve the simulating speed when visualization and dynamical computation are considered at the same time, ...
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ISBN:
(纸本)0780378407
Locomotive-track coupling dynamical simulation has made good achievements([1][2]). However, a problem, how to improve the simulating speed when visualization and dynamical computation are considered at the same time, is still not overcome. Here, based on existing success, we present a distributed COM technology, which is used to change the status of the present slow speed simulation. In this paper, at first, the locomotive-track dynamics system is modeled, a resolving formula is discussed, and visualization of the system is given, then the characteristic of the main integration resolving algorithm is analyzed, which is the reason of actuating the DCOM method. Secondly, we divide these resolving equations into several separated module, which is distributed in different resolving machine as a COM, and construct a distributedparallelcomputing environment, this method effectively reduces the computing load of the main computer and the computing speed is improved, which is the basement of real-time simulation such as virtual dynamical test of locomotive.
Reservation in advance provides a solution for the need of reserving the network resource for future. Advance reservation for global grids becomes an important research area as it allows users to gain concurrent acces...
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ISBN:
(纸本)0769524052
Reservation in advance provides a solution for the need of reserving the network resource for future. Advance reservation for global grids becomes an important research area as it allows users to gain concurrent access for their applications to be executed in parallel, and guarantees the availability of resources at specified future times. But performance of reservation for grid was seldom considered In this paper, an adaptive advance reservation is introduced It can modify not only the parameters of latest request but also that of admitted requests because sometimes the latest request is fixed with parameters. Particular admission control algorithm for this new type of reservation is provided too. Simulation shows that it can improve performance of resource reservation in terms of both call acceptance rate and resource utilization when the percentage of fixed requests is not very high.
The technology of distributed objects improves the systems' reliability and extensibility, and yet brings the complexity of management and maintenance on objects. In this paper, a management mechanism of service o...
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The processing of three-dimensional (3-D) objects from 3-D digital image data is an important task in the image processing and the computer vision fields. The distance transform (DT) is extensively applied in the imag...
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ISBN:
(纸本)0780378407
The processing of three-dimensional (3-D) objects from 3-D digital image data is an important task in the image processing and the computer vision fields. The distance transform (DT) is extensively applied in the image processing and computer vision areas as a key operation. In a two or three-dimensional image array, the computation of distance transform (DT) is an important task, With the increasing application of 3D voxel images, it is useful to consider the distance transform of a 3D digital image array. In order to provide the efficient transform computations, parallelism is employed. We develop parallel algorithms for the three-dimensional Euclidean distance transform (3D-EDT) on the SIMD hypercube computer. The time complexity of our parallel algorithm is O{log(2) N} for an N x N x N image array using N-3 processors. A generalized parallel algorithm for the 3D-EDT is also proposed and it runs O((N/p)(3) log(N) + (N/p)(2) log(2) p) time for an N x N x N binary image array on the SIMD hypercube computer using p(3) PE's, where 1 less than or equal to p less than or equal to N.
作者：
Xu, YFFudan Univ
Dept Comp & Informat Technol Shanghai 200433 Peoples R China
The function of digital library is not limited to information management now, hut also has more relationship with community. P2P networks are highly scalable platforms, which should be suitable for personal digital li...
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ISBN:
(纸本)0769524052
The function of digital library is not limited to information management now, hut also has more relationship with community. P2P networks are highly scalable platforms, which should be suitable for personal digital library, but the contradiction between efficiency and autonomy holds back their progress in applying them to DL. In this paper, we propose an autonomous flexible content addressable network (Flexible CAN), in which nodes can change their position freel. Flexible CAN has the advantages of both efficiency and autonomy. It can be used not only for information managing and retrieving, but also autonomic detect group of users with the same interest. Thus the group becomes a community, and users can share their resources and experiences conveniently.
Grid requires scalable mechanisms that can be used to obtain the information of resources in Grid environment. In this paper, we analyzed the aims and main tasks of Grid Monitoring and the advantage of GAM (Grid monit...
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ISBN:
(纸本)0769524052
Grid requires scalable mechanisms that can be used to obtain the information of resources in Grid environment. In this paper, we analyzed the aims and main tasks of Grid Monitoring and the advantage of GAM (Grid monitoring Architecture), then proposed a java-based design pattern of Grid Monitoring System (JGMS) on the basis of GMA. The JGMS use special agents to complete the communication between Producer and Consumer in the different grid nodes. So, it can work on different platforms, pass through firewalls and be easy to deploy and use.
distributed system monitor of heterogeneous environment is a very important problem in distributed system searching field. This paper describes an asynchronous event relation model, which constructs a hiberarchy event...
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ISBN:
(纸本)0769524052
distributed system monitor of heterogeneous environment is a very important problem in distributed system searching field. This paper describes an asynchronous event relation model, which constructs a hiberarchy event relation graph according to event equivalent relation, and event ordinal relation, and event independent relation, and event exclusive relation. According to event relation graph, asynchronous event transacting process determines which events will be transacted This model not only reduces numbers of asynchronous events transacted but also can reflect state of monitor object. The periodic method and asynchronous event relation model are compared with monitoring distributed system in this paper. By implementation, the model is efficient.
In this paper, a parallel algorithm for FDTD method is presented. The algorithm is based on DDM (domain decomposition method). We use the MPI (Message Passing Interface) library to implement the parallel DD-FDTD metho...
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In this paper, a parallel algorithm for FDTD method is presented. The algorithm is based on DDM (domain decomposition method). We use the MPI (Message Passing Interface) library to implement the parallel DD-FDTD method. The original domain is decomposed into several sub-domains according to the features of the problem, which are treated as the processes to computation nodes. The FDTD computation is carried out independently in local meshes in each process. The data are exchanged by communication between adjacent sub-domains or with overlapped meshes and the interpolation scheme is applied to the data exchanged. The example of its application is given.
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