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First, a quantized progressive second price (PSP) auction mechanism called the Unique Limit Quantized - PSP (UQ-PSP) is presented for the allocation of fixed or timevarying quantities of a resource among arbitrary populations of agents. It is shown that (i) the states (i.e. bid prices and quantities) of the corresponding iterative dynamical auction system converge to a unique quantized (Nash) equilibrium...
Many structured Peer-to-Peer-Systems (P2P) have been developed over the past years. However, most of them rely on hash-functions and thus put major restrictions on applications being implemented on top of them. In this paper we present a very detailed description of Papnet, a hash-free P2P overlay-network that supports range-queries and realizes an infinite alphanumeric address space that can be used...
This paper investigates and analyses the dynamics engendered by the engineering of self-organisation in a global Service Oriented Architecture. The effects are assessed via a resource allocation algorithm for load balancing, based on the observed behaviour of foraging honeybees. It is implemented at the application layer of a simulated server farm type system and its impact is investigated across...
One of the challenges of P2P systems is to perform load balancing efficiently. A distributed hash table (DHT) abstraction, heterogeneous nodes, and non uniform distribution of objects cause load imbalance in structured P2P overlay networks. Several solutions are suggested to solve this problem but they have some restrictions. They assume the homogeneous capabilities of nodes, unawareness of the link...
HLA-based simulations can experience performance degradation due to communication latencies between simulation federates, which generate significant cumulative overhead. Even though the HLA standard provides mechanisms to decrease the misuse of network resources, it does not present any tool to diminish the communication latencies between interactive federates. Moreover, the interaction dependencies...
Survivability becomes an important issue in optical networks due to the huge bandwidth offered by optical technology. Many works have studied network survivability. The majority of these works are typically destined to single-domain. In this work we address the survivability in multidomain optical networks. This paper provides a classification of the existing protection solutions proposed for multi-domain...
Resource discovery is an important aspect of many modern large-scale distributed systems. In the past, this problem has been solved using many different approaches, such as a central registry server, flooding-based protocols, and distributed hash tables. In this paper, these three widely used architectures are compared, using measurement results obtained from real implementations run on an Emulab...
We describe the architecture of PHAROS (Petabit Highly-Agile Robust Optical System), developed under the DARPA CORONET program. PHAROS provides traffic engineering, resource management and signaling solutions for highly-agile, large-capacity core optical networks. PHAROS technology facilitates rapid configuration of network resources to address dynamic traffic needs in future global military and commercial...
Despite ??airborne network (AN) topology design?? and careful planning of AN trajectories, unexpected disruptions (from hardware failures to changes in mission requirements and hostile attacks) may cause nodes not to connect to one another directly or indirectly either because they are out of one another's range or because nodes do not meet one another according to their preplanned trajectories. Since...
InfiniBand networks are aimed to fulfill increasing communication demand of parallel applications in high performance clusters. However, the dynamic behavior of communication load may cause bottlenecked link(s) which lead to message congestion. Congestion spreading increases latency and reduces network throughput causing important performance degradation. In this paper, we propose a congestion control...
In this paper we present a fault-tolerant, collaborative peer-to-peer object storage architecture with adaptive topology and efficient multidimensional range search capabilities. Every stored object has a fixed set of index properties, whose ranges of values form a multidimensional geometric property space. The architecture efficiently supports multidimensional range queries by mapping the peer identifiers...
Constraint satisfaction has been a very successful paradigm for solving problems such as resource allocation and planning. Many of these problems pose themselves in a context involving multiple agents, and protecting privacy of information among them is often desirable. Secure multiparty computation (SMC) provides methods that in principle allow such computation without leaking any information. However,...
Multicast and broadcast service (MBS) is one of the important services for next generation wireless systems. In WiMAX, the radio resource unit (i.e., time, frequency, code, etc.) for MBS is centralized allocated by a network device named Anchor ASN-GW. The ASN-GW has to ensure that non-overlapping radio resource units are allocated to BSs for delivering different MBS contents. This paper presents...
Distributed application (e.g., grid-enabled application) performance is highly dependent on the information available when computational resources are chosen. A resource selection based on computational resource information complemented with network performance information has the potential to be optimal from the application performance viewpoint. This is particularly true for network-intensive distributed...
Testbeds are necessary to evaluate the performance of network applications for a wide range of deployment scenarios. Especially in wireless sensor networks, where the performance highly depends on environmental conditions, traditional computer-based simulations provide validity to only limited extent. Different approaches have been carried out to develop generic testbeds for protocol evaluation, but...
Typically, topology control is perceived as a per-node transmit power control process that achieves certain network- level objectives. We take an alternative approach of controlling the topology of a network purely by assigning channels to multiple radio interfaces on nodes. Specifically, we exploit the synergy between topology control and channel allocation to reduce the overall interference in multi-radio...
Current Virtual-Channel routers disregard potentially useful information about on-chip communication flows. This often leads to inefficient resource utilisation in existing Networks-on-Chips for flow-based communication patterns. The flow-based traffic exhibited by forthcoming applications requiring large streaming datasets (sophisticated graphical interfaces, mobile connectivity, scientific applications,...
This paper presents a testbed implementation of an inter-carrier GMPLS (generalized multi protocol label switching) service architecture recently proposed. This architecture couples the path computation element (PCE)-based control plane with a service plane managing discovery, composition and activation functions of inter-carrier service elements. The testbed implements the required PCE communication...
Tiny devices, smart objects, home gateways, sensor networks, have become an integral part of our everyday life and of our socio-economic ecosystem. However their large number, their distribution and their volatility and heterogeneity make their management fiendishly complex. Traditional management systems, that are mainly ad-hoc or centralized, reach their limits in such complex management contexts...
Today most systems in high-performance computing (HPC) feature a hierarchical hardware design: Shared memory nodes with several multi-core CPUs are connected via a network infrastructure. Parallel programming must combine distributed memory parallelization on the node interconnect with shared memory parallelization inside each node. We describe potentials and challenges of the dominant programming...
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