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File Transfer (file + transfer)

Distribution by Scientific Domains

Engineering	75%

Selected Abstracts

Virtual laboratory: A distributed collaborative environment

COMPUTER APPLICATIONS IN ENGINEERING EDUCATION, Issue 1 2004
Tiranee Achalakul
Abstract This article proposes the design framework of a distributed, real-time collaborative architecture. The architecture concept allows information to be fused, disseminated, and interpreted collaboratively among researchers who live across continents in real-time. The architecture is designed based on the distributed object technology, DCOM. In our framework, every module can be viewed as an object. Each of these objects communicates and passes data with one another via a set of interfaces and connection points. We constructed the virtual laboratory based on the proposed architecture. The laboratory allows multiple analysts to collaboratively work through a standard web-browser using a set of tools, namely, chat, whiteboard, audio/video exchange, file transfer and application sharing. Several existing technologies are integrated to provide collaborative functions, such as NetMeeting. Finally, the virtual laboratory quality evaluation is described with an example application of remote collaboration in satellite image fusion and analysis. © 2004 Wiley Periodicals, Inc. Comput Appl Eng Educ 12: 44,53, 2004; Published online in Wiley InterScience (www.interscience.wiley.com); DOI 10.1002/cae.20008 [source]

Secure parallel file distribution through a streaming worm network

BELL LABS TECHNICAL JOURNAL, Issue 1 2007
Michael J. Sheehan
This paper introduces the novel concept of streaming worms and applies the concept to secure parallel file transfer. A streaming worm (sworm) is a powerful class of software that can replicate itself as well as a chunk of arbitrary payload code on a predetermined set of nodes in a network very quickly, while streaming data between all of the nodes in parallel. By harnessing the parallelism and scalability of sworms in a file distribution application, large gigabyte files can be efficiently and securely distributed to a large number of nodes over a Transmission Control Protocol/Internet Protocol (TCP/IP) network without congesting the network. But unlike traditional file transfer tools such as File Transfer Protocol (FTP), remote copy (RCP), or secure copy (SCP), the total sworm transfer time is relatively independent of the number of target nodes for large files. As such, this method of parallel file distribution is particularly useful when a large array or cluster of similar computers has to be quickly updated with a large amount of identical software or data. © 2007 Alcatel-Lucent. [source]

Dimensioning of data networks: a flow-level perspective

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 6 2009
Pasi Lassila
Traditional network dimensioning formulations have applied the Erlang model where the connections reserve capacity in the network. Until recently, tractable stochastic network models where the connections share the capacity in the network did not exist. The latter are becoming increasingly important as they can be applied to characterise file transfers in current data networks (e.g. IP networks). In particular, they can be utilised for dimensioning of networks with respect to the file transfer performance. To this end, we consider a model where the traffic consists of elastic flows (i.e. file transfers). Flows arrive randomly and share the network resources resulting in stochastically varying transmission rates for flows. Our contribution is to develop efficient methods for capacity planning to meet the performance requirements expressed in terms of the average transmission rate of flows on a given route, i.e. the per-flow throughput. These methods are validated using ns2 simulations. We discuss also the effects of access rate limitations and how to combine the elastic traffic requirements with those of real-time traffic. Finally, we outline how the methods can be applied in wireless mesh networks. Our results enable a simple characterisation of the order-of-magnitude of the required capacities, which can be utilised as a first step in practical network planning and dimensioning. Copyright © 2008 John Wiley & Sons, Ltd. [source]

A DVB/Inmarsat hybrid architecture for asymmetrical broadband mobile satellite services

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 2 2006
Bjørn Roger Andersen
Abstract In order to bridge the gap, both regulatory and technologically, between offering mobile satellite services at L-band today and broadband mobile services at C-band, Ku-band or Ka-band in the future, a short-term solution is foreseen. Therefore, a DVB/Inmarsat hybrid service offering bi-directional asymmetrical satellite connectivity, with a broadband receive channel at Ku-band based on DVB-S, and with a transmit channel at L-band based on Inmarsat Mobile Packet Data Service, has successfully been developed, implemented and tested. The article focuses on the rationale for, and a technical solution, and how this can be evolved to support use of Inmarsat Broadband Global Area Access as transmit channel at L-band. There are no regulatory issues associated with global operation of such a system, and the users can access the services using cost-efficient off-the-shelf equipment, since the well established Inmarsat and DVB standards are utilized. The system has proved its feasibility to offer services like Internet access, email access, fast file transfers, and IP streaming of audio and video, in addition to the traditional Inmarsat services. Copyright © 2006 John Wiley & Sons, Ltd. [source]