science
RSS scienceOptimal Replica Placement in Tree Networks With QoS and Bandwidth Constraints and the Closest Allocation Policy
White Paper This paper deals with the replica placement problem on fully homogeneous tree networks known as the Replica Placement optimization problem. The client requests are known beforehand, while the number and location of the servers are to be determined. [11 Jul 2008]
A Class-Based Dynamic Bandwidth Allocation Scheme for EPONs
White Paper In an Ethernet Passive Optical Network (EPON), all Optical Network Units (ONUs) share one uplink channel to transmit multiple traffic. To avoid data collision, a contention-free MAC protocol is needed to schedule the transmission order of different... [11 Jul 2008]
Securing Layer 2 in Local Area Networks
White Paper Network security problems have been well known and addressed in the application, transport, or network layers. However, the Data Link Layer (Layer 2) security has not been adequately addressed yet. To secure Local or Metropolitan Area Networks, the... [11 Jul 2008]
Load Balancing on Open Networks: A Mobile Agent Approach
White Paper In order to disperse the load on a Web server, generally the server cluster is configured to distribute access requests, or mirror servers are distributed geographically on different networks. Use of the Internet and the World-Wide-Web (WWW) has... [11 Jul 2008]
Dynamic Traffic Profiling for Efficient Link Bandwidth Utilization in QoS Routing
White Paper Traffic Engineering has been the prime concern for Internet Service Providers (ISP's), with the main focus being minimization of over-utilization of network capacity even though additional capacity is available which is underutilized. [11 Jul 2008]
Minimum Failure Explanations for Path Vector Routing Changes
White Paper Path vector protocols in routing networks convey entire path information to each destination. When links fail, affected paths are replaced by new paths, and by observing the entire path information, one might hope to infer the failed links that... [11 Jul 2008]
A Rate Control Scheme for H.264 Video Under Low Bandwidth Channel
White Paper The dilemma of the Quantization Parameter (QP) being involved in both rate control and Rate-Distortion Optimization (RDO) prevents using the traditional rate control scheme. Although some rate control schemes are proposed to circumvent the dilemma... [11 Jul 2008]
Advanced Design Methods of Doherty Amplifier for Wide Bandwidth, High Efficiency Base Station Power Amplifiers
White Paper This paper has proposed advanced design methods of Doherty amplifier for high efficiency base station power amplifiers with wide bandwidth. First, the paper develops Doherty amplifier with uneven power drive which is provided more input power to... [11 Jul 2008]
Multi-Bid Auctions for Bandwidth Allocation in Communication Networks
White Paper This paper designs a bandwidth pricing mechanism that solves congestion problems in communication networks. The scheme is based on second-price auctions, which are known to be incentive compatible when a single indivisible item is to be sold (users... [11 Jul 2008]
A Bandwidth Efficient Modulation Scheme Using Quasi-Orthogonal Sequences
White Paper A novel modulation scheme using quaternary quasi-orthogonal sequences as M-ary modulation symbols is proposed. High bandwidth efficiency and quasi-orthogonality between the modulation symbols allows to increase the normalized data rate with little... [11 Jul 2008]
A Dynamic Bandwidth Allocation Scheme for VSAT-Based Networks
White Paper The limited bandwidth available to an organization through an expensive gateway like VSAT (very small aperture terminal) requires proper and effective utilization. This paper proposes a scheme, which allocates bandwidth to applications based on... [11 Jul 2008]
White Paper: Tips for Writing Good Use Cases
White Paper Writing good use cases is more of an art than a science. In this IBM Rational white paper "Tips for writing good use cases," IBM requirements evangelist Jim Heumann explores the history and function of the use case, then provides a set of tips to... [10 Jul 2008]
Adaptive Load Balancing for MPI Programs
White Paper Parallel Computational Science and Engineering (CSE) applications often exhibit irregular structure and dynamic load patterns. Many such applications have been developed using MPI. Incorporating dynamic load balancing techniques at the application... [10 Jul 2008]
Load Balancing Strategies for Parallel SAMR Algorithms
White Paper Highly resolved numerical solutions of partial differential equations are important in many areas of science and technology. Only adaptive mesh refinement methods reduce the necessary work sufficiently, allowing the calculation of realistic problems. [10 Jul 2008]
Object-Based Adaptive Load Balancing for MPI Programs
White Paper Parallel Computational Science and Engineering (CSE) applications often exhibit irregular structure and dynamic load patterns. Many such applications have been developed using procedural languages (e.g. [10 Jul 2008]
