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This work is a study of personal recommendation algorithm employing the projection of weighted bipartite consumer-product network. The weight of the edges is directly the rate that a customer giving on a product. Following a network based resource allocation process we get similarities between every pair of consumers, which is then used to produce prediction and recommendation. We show this is also...
This paper proposes a new load balancing strategy based on a systematical research on current load balancing mechanism. The new strategy combines the methods of gossip propagation and replication policy, and adopts two different propagation policies to cope with light and heavy overloaded conditions so as to improve performance of networks. At the end of this paper, we prove the reliability and scalability...
In modern satellite communication systems, because of the high efficiency and flexibility, MF-TDMA becomes one of hot issues. The resource-allocation can be described as optimal location problem in the MF-TDMA channel structure (MTCS). The effective timeslot management is the guarantee of the efficiency of resource management in MF-TDMA system. This paper discusses the timeslot allocation problem...
Leveraging DHTs (distributed hash table), we propose a novel architecture, which applies multiple query optimization technique to efficiently aggregate queries in large scale distributed networks. We target applications that continuously query the data sources and manipulate a large amount of query results. Our goal is to implement system components to aggregate distributed queries in the network,...
Modern OS virtualization technology allows for "live migration" of virtual servers between physical hosts after the initial consolidation thus providing new avenues for performance optimization. This paper focuses on quantifying by how much data center efficiency can be improved using dynamic (i.e., in response to demand changes) real-location of virtual machines between physical servers...
A key obstacle to large-scale network simulation over PC clusters is the memory balancing problem where a memory-overloaded machine can slow down an entire simulation due to disk I/O overhead. Memory balancing is complicated by (i) the dfficulty of estimating the peak memory consumption of a group of nodes during network partitioning-a consequence of per-node peak memory not being synchronized-and...
A service provisioning system is examined, where a number of servers are used to offer different types of services to paying customers. A customer is charged for the execution of a stream of jobs; the number of jobs in the stream and the rate of their submission is specified. On the other hand, the provider promises a certain quality of service (QoS), measured by the average waiting time of the jobs...
This paper describes a simplified parallelization of the near-field interaction in the multilevel fast multipole algorithms (MLFMA) based on a data decomposition strategy with an improved load balancing and the data locality. It shows good performance on distributed memory computers using the message passing interface (MPI).
Multicore processors promise continued hardware performance improvements even as single-core performance flattens out. However they also enable increasingly complex application software that threatens to obfuscate application-level performance. This paper applies operational analysis to the problem of understanding and predicting application-level performance in parallel servers. We present operational...
Several activities of Web-based architectures are managed by algorithms that take runtime decisions on the basis of continuous information about the state of the internal system resources. The problem is that in this extremely dynamic context the observed data points are characterized by high variability, dispersion and noise at different time scales to the extent that existing models cannot guarantee...
Streaming monitorables on an overlay plane orthogonal to the data-path is emerging as a promising way to monitor, detect and isolate network impairments and outages. However, keeping the overlay stable and efficient poses acute challenges, since the overlay network itself shall not be monitored for outages. A linear mapping of exporter elements onto collectors often leads to a sub-optimal resource...
Pricing network resources is a crucial component for proper resource management and the provision of quality of service guarantees. In this paper we propose a decentralized real-time market (RTM) model for pricing differentiated services (DiffServ), which attempts to achieve efficient resource allocation, while reducing computational overheads. We review issues relating to congestion sensitive pricing...
The most common technology in local area networks is the Ethernet protocol. The continuing evolution of Ethernet has propelled it into the scope of metropolitan area networks. Even though Ethernet is fast and simple, the spanning tree in Ethernet is inefficient in terms of network utilization and load balancing. In this work, we compare the performance of spanning tree and link state algorithms in...
With today's heterogeneous access to the Internet, users will move between wired and wireless environments and between infrastructure mode and ad hoc mode of wireless communication. When a mobile node moves from an infrastructure connection and connects multihop to an Internet gateway, the performance will degrade and it may not be able to send all of its traffic via a single gateway. This highlights...
In the wireless networks, the power saving is highly important. The way of power saving by resource allocation and scheduling is attached more attention on recently. This paper explores optimal and suboptimal scheduling strategy for a multi- carrier system over fading channels. The scheduling objective is to minimize the average system power under the delay constraint. Specifically, we study the trade-offs...
This paper proposes a new approach to the modeling of packet switching networks that is based only on measurements (or simulations) and does not require any information on the network structure. Network managers usually need to assess network behavior for varying number of users or evolving traffic profiles, even without a complete knowledge of the network topology or resources. In these cases, it...
Schedule based MAC schemes do not perform well for dynamic network and traffic conditions. Their inflexibility makes them unsuitable for most real life applications. This inflexibility is due to the nature of schedule based approach. However, it depends mainly on the re-scheduling and slot allocation strategies employed. A flexible schedule based scheme should allow for the nodes to access the medium...
The following topics are dealt with: local computer networks; wireless networks; high speed networks; multicast and security; overlay networks; WLAN/IEEE 802.1; wireless ad hoc and mesh networks and Split TCP; peer-to-peer networks; quality of service; high speed, LAN and home area networks; sensor networks; telecommunication security; mobility management and heterogeneous access; resource allocation...
High level architecture (HLA) is a well-known standard for constructing and supporting large-scale and complex distributed interactive simulation systems. HLA has several key components, among which; run-time infrastructure (RTI) is a crucial one as a service provider engine in HLA based simulation systems. Real Time extension of HLA/RTI became very important due to the necessity for the HLA to support...
With the convergence of mobile telephony and the Internet, it seems that future telephony data will be transferred on VoIP datagram. Mobility will affect the overall system performance especially for voice communication. Thus, maintaining the quality of voice is necessary. It is important to guarantee that the end-to-end delay must be kept at a certain level. This paper investigates the performance...
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