180 research outputs found
Optical packet switching over arbitrary physical topologies using the Manhattan street network : an evolutionary approach
No full textPublished in "Towards an Optical Internet", A. Jukan (Ed.). Optical packet switching over arbitrary physical topologies typically mandates complex routing schemes and the use of buffers to resolve the likely contentions. However, the relatively immature nature of optical logic devices and the limitations with optical buffering provide significant incentive to reduce the routing complexity and avoid optical domain contentions. This paper examines how the Manhattan Street Network (MSN) and a particular routing scheme may be used to facilitate optical packet switching over arbitrary physical topologies. A novel approach, genetic algorithms (GA), is applied to the problem of deploying the MSN (near) optimally in arbitrary physical topologies. A problem encoding is proposed and different implementations of GA described. The optimum GA parameters are empirically selected and GA is successfully used to deploy the MSN in physical topologies of up to 100 nodes. Favourable results are obtained. GA are also seen to out-perform other heuristics at deploying the MSN in arbitrary physical topologies for optical packet switching
In defense of "geopolitical remote sensing": reply to Moisio and Harle
No full textThe author of a recently published paper on Finland's identity politics and national identity (Antonsich, 2005) responds to comments presented in the preceding paper in this issue of Eurasian Geography and Economics (Moisio and Harle, 2006). The rejoinder focuses on the nature of place knowledge acquired "in place" versus "at distance" as well as on more specific differences in perspective (e.g., use of sources, terminology, critical geopolitcs). Copyright © 2006 by V. H. Winston & Son, Inc. All rights reserved
1 HOW DOES SAD MOOD AFFECT RESPONSES TO UNFAIRNESS IN SOCIAL ECONOMIC DECISIONS? A NEUROPHYSIOLOGICAL INVESTIGATION
No full textRights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Downloaded 17-May-2016 04:29:1
Performance analysis of a 2-D time-wavelength OCDMA wavelength-aware receiver with beat noise
No full textThe effect of beat noise on two-dimensional time-wavelength optical code-division multiple-access systems utilising wavelength-aware receivers is examined. A derivation of a general formula for the bit error probability taking into consideration multiple access interference (MAI) and other noise sources is given. In addition, a comparison between the system performance of such a receiver and the traditional configuration is presented. Studies to date that have focused only on the MAI limited case showed that the wavelength-aware configuration yields a better performance when compared to the traditional receiver. When beat noise is considered, the numerical results reveal that the performance of wavelength-aware receiver is very sensitive to beat noise and is not superior over the traditional receiver
The impact of mobility models on the performance of mobile Ad Hoc network routing protocol
No full textA mobility model represents nodes distribution and movement over the network. Several research works have shown that a selection of mobility model can affect the outcome of routing performance simulation in Mobile Ad Hoc Networks. Thus, a routing protocol may only be effective in a particular mobility model or scenario but performs inferiorly in another. As a result, analyses of routing protocol performance are often based on inadequate information leading to inaccurate argument and conclusion. In this paper, three different mobility models have been selected, where each of them is highly distinctive in terms of nodes movement behavior. In addition, a new measurement technique called probability of route connectivity is introduced. The technique is used to quantify the success rate of route established by a routing protocol. Extensive simulation runs are done and results are compared between each mobility model
Globalizing resistance against war? : a critical analysis of the theoretical debate through a case study of the "new" anti-war movement in Britain
No full textThe study engages with a controversial theoretical debate on ‘global resistance’ in the context of the anti-war movement. Through an empirical case study of four anti-war organizations in Britain, the thesis critically evaluates dominant globalist theoretical discourses and their state-centric critiques from the perspective of ‘critical theory in political practice’ and seeks to develop the theoretical debate further. Acting as a critical mediator in between the metatheories and micropolitics of resistance, the author examines how the theoretical discourses ‘resonate’ with the premises of the current anti-war movement; what the theories fail to consider in terms of political practice; and to which extent the values and normative visions embedded in their broader political projects relate to the movement.
The research demonstrates that the connection between the theories and the political practice is not only inadequate but also problematic in many regards. The divergences between the globalist frameworks and the premises of the movement are particularly substantial; convergence with the state-centric approach is found more often. Although it also succeeds in illustrating serious problems in the globalist frameworks, the thesis argues that the state-centric approach is not without problems either. All three theoretical approaches have a problematic tendency to resort to a dualistic ‘either-or’ logic in conceptualizing power, effective strategies and the primary context of resistance which represents a clear diversion from the understandings held within the movement where analyses and conceptions are overlapping and mixed, echoing often a ‘both-and’ approach. The globalist frameworks are problemactic also because in conceptualizing the multitude and global civil society as consensual global political collectives, they fail to take into account political conflicts and power struggles within the movement. The study shows that below the surface there are many political conflicts and struggles going on. Transforming the movement into something more permanent and global is an extremely challenging endeavor, one that cannot be established ‘from above’.
Instead of defining their political projects of resistance in a way which enables their conceptualizations to be detached from practice and their normative visions and suggestions to diverge from the premises of the movement, the theories must closely engage with the movement in order to establish an emancipatory dialogue in the true sense of critical theory. The study contributes insights for developing the theoretical debate further, suggesting that a ‘both-and’ approach instead of an ‘either-or’ would not only reflect more accurately how the relationship between the local and global – and many other concepts as well – are conceived within the movement, but would also provide a more productive and comprehensive perspective for conceptualizing power and resistance in the context of social movements generally. While revealing many ongoing political conflicts and power struggles between the organizations studied, the thesis brings forward problems and tensions also within the movement and suggests it would benefit from a more open discussion about the complex relationship between unity and diversity.ei tietoa saavutettavuudest
Silencium, Spiritu
No full textSara Mcliver, soprano ; Jane Sheldon, soprano ; Sinfonia Australis / David Stanhope, conductor.ABC Classic FMOff-air broadcast recording. Copied under Part VA of the Copyright Ac
Service level agreement framework for differentiated survivability in GMPLS-based IP-over-optical networks
No full textIn the next generation optical internet, GMPLS based IP-over-optical networks, ISPs will be required to support a wide variety of applications each having their own requirements. These requirements are contracted by means of the SLA. This paper describes a recovery framework that may be included in the SLA contract between ISP and customers in order to provide the required level of survivability. A key concern with such a recovery framework is how to present the different survivability alternatives including recovery techniques, failure scenario and layered integration into a transparent manner for customers. In this paper, two issues are investigated. First, the performance of the recovery framework when applying a proposed mapping procedure as an admission control mechanism in the edge router considering a smart-edge simple-core GMPLS-based IP/WDM network is considered. The second issue pertains to the performance of a pre-allocated restoration and its ability to provide protected connections under different failure scenarios
Always historicize? Penda's Fen in the 1970s
No full textBook synopsis: In 1974, the BBC broadcast the film Penda’s Fen, leaving audiences mystified and spellbound. “Make no mistake. We had a major work of television last night,” The Times declared the next morning. Written by the playwright and classicist David Rudkin, the film follows Stephen, an 18-year-old boy, whose identity, sexuality, and suffocating nationalism unravel through a series of strange visions. After its original broadcast, Penda’s Fen vanished into mythic status, with only a single rebroadcast in 1990 sustaining its cult following. Penda’s Fen has now become totemic for those interested in Britain’s deep history, folklore, and landscape.
Of Mud & Flame includes insightful essays by scholars across a range of disciplines including television history, literature, theatre, and medieval studies. It also contains a wealth of creative contributions from contemporary writers and poets inspired by this unique cornerstone of Britain’s uncanny archive, as well as recollections from actors Spencer Banks and Christopher Douglas, and reflections from Rudkin himself. Together with this breadth of commentary, Of Mud & Flame also includes the full revised screenplay of Penda’s Fen, its first time in print since 1975
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