26,009 research outputs found
Information processing in complex networks
No full textEerste resultaten van onderzoek van Rick Quax suggereren dat een combinatie van informatietheorie, netwerktheorie en statistische mechanica kan leiden tot een veelbelovende theorie om het gedrag van complexe netwerken te voorspellen. Er bestaat nog weinig theorie over het gedrag van dynamische eenheden die verbonden zijn in een netwerk, zoals neuronen in een breinnetwerk of genen in een gen-regulatienetwerk. Quax combineert informatietheorie, netwerktheorie, en statistische onderzoeken en mechanica om te bekijken of dit een bruikbare theorie oplevert voor het gedrag van zogeheten ‘complexe netwerken’. Complexe netwerken zijn overal, van genregulatie in een cel tot infectieverspreiding, van hersenen tot sociale media. Zelfs als het gedrag van ieder afzonderlijk gen, neuron of persoon volledig bekend is, blijft het onduidelijk hoe het netwerk zich als geheel gedraagt. Quax zet de eerste stappen om een theorie te ontwikkelen voor het gedrag van complexe netwerken
Author Peter FitzSimons speaking at the National Library of Australia, Canberra, 13 November 2012 /
No full textTitle from acquisitions documentation.; Part of the collection: Portraits of author Peter FitzSimons speaking at the National Library of Australia, Canberra, 13 November 2012.; Acquired in digital format; access copy available online.; Mode of access: Online.; Photographed by a staff member of the National Library of Australia
Adaptive Web-Based VR Streaming of Multi-LoD 3D Scenes via Author-Provided Relevance Scores
No full textThe growing storage requirements of 3D virtual scenes, combined with the increased heterogeneity of consumption devices, trigger the need for novel, on-demand streaming techniques of textured meshes. This paper proposes a way to perform relevance-aware Adaptive Bit-Rate (ABR) scheduling using MPEG-DASH, tailored to VR consumption in the web browser. Scene authors can annotate the relative importance of scene assets to optimize scheduling decisions. Our approach outperforms the state-of-the-art (measured using the MS-SSIM metric) across different scene complexities and network configurations, and is found to be most beneficial when scene complexity is high and network conditions are relatively poor.IEEE; IEEE Comp Soc; Virbela; Tecnico Lisboa; Immers Learning Res Network; Qualcomm; Vicon; HitLabNZ AIGI; Microsoft; Appen; Facebook Real Labs Res; XR Bootcamp; NSF; Fakespace Lab
PHY-layer security is no alternative to cryptography
No full textIn recent works, numerous physical-layer security systems have been proposed as alternatives to classic cryptography. Such systems aim to use the intrinsic properties of radio signals and the wireless medium to provide con dentiality and authentication to wireless devices. However, fundamental vulnerabilities are o en discovered in these systems shortly a er their inception. We therefore challenge the assumptions made by existing physical-layer security systems, and postulate that weaker assumptions are needed in order to adapt for practical scenarios. We also argue that if no computational advantage over an adversary can be ensured, secure communication cannot be realistically achieved.This research was funded by a Ph.D. Grant of the Research Foundation Flanders (FWO)
Visualizing QUIC and HTTP/3 with qlog and qvis
No full textThe new QUIC and HTTP/3 protocols are complex to implement, debug and use. To tackle this challenge we have worked on both qlog, a structured endpoint logging format, and qvis, a suite of interactive visualizations. These projects have found widespread uptake in the QUIC community and have been used to identify various high-impact real-world bugs. As we are now extending qlog and qvis to other protocols and think they can be useful for teaching and research as well, we feel the time is right to bring our work to the wider SIGCOMM community. We do this by means of a demo of the qvis tools, showcasing bugs we found in complex areas such as congestion control, stream multiplexing and packetization
Knocking on IPs: Identifying HTTPS Websites for Zero-Rated Traffic
No full textZero-rating is a technique where internet service providers (ISPs) allow consumers to utilize a specific website without charging their internet data plan. Implementing zero-rating requires an accurate website identification method that is also efficient and reliable to be applied on live network traffic. In this paper, we examine existing website identification methods with the objective of applying zero-rating. Furthermore, we demonstrate the ineffectiveness of these methods against modern encryption protocols such as Encrypted SNI and DNS over HTTPS and therefore show that ISPs are not able to maintain the current zero-rating approaches in the forthcoming future. To address this concern, we present “Open-Knock,” a novel approach that is capable of accurately identifying a zero-rated website, thwarts free-riding attacks, and is sustainable on the increasingly encrypted web. In addition, our approach does not require plaintext protocols or preprocessed fingerprints upfront. Finally, our experimental analysis unveils that we are able to convert each IP address to the correct domain name for each website in the Tranco top 6000 websites list with an accuracy of 50.5% and therefore outperform the current state-of-the-art approaches.This research was funded in part by Bijzonder Onderzoeksfonds (BOF) of Hasselt University. Finally, the authors thank Balazs Nemeth and Pieter Robyns for sharing their indepth knowledg
Realistically Fingerprinting Social Media Webpages in HTTPS Traffic
No full textIn webpage fingerprinting (WPF), an adversary attempts to identify
webpages in encrypted network traffic. Identifying social media
webpages however is a challenging task, due to the similarity and
dynamic nature of such pages. Existing webpage fingerprinting
attacks often have unrealistic assumptions regarding the capability
of government agencies or knowledge of the criminal’s environment, which renders these attacks ineffective when applied to social
media platforms. In this paper, we unravel the current concerns in
state of the art WPF attacks in a social network context for forensic
analysis. To resolve the issues presented, we propose an enhanced
version of the WPF attack ‘IUPTIS’ and introduce an intelligent
observer that significantly improves upon previous works. Furthermore, our improvements are compared to related WPF attacks by
conducting extensive experiments on two social platforms: Twitter
and Instagram. Our examination shows that the improved IUPTIS
attack defeats previous works in terms of realistic obstacles such
as HTTP/2, caching and performance costs, thus making it feasible
to identify social media webpages with minimal resources.Thank you to Robin Marx for his extensive knowledge of the
HTTP/2 protocol. As well as Pieter Robyns for his valuable deep
learning experience, Balazs Nemeth and Tom Haber for their insightful feedback.
This research was funded in part by the Bijzonder Onderzoeksfonds
(BOF) of Hasselt Universit
Moral Good, the Beatific Vision, and God’s Kingdom Writings by Germain Grisez and Peter Ryan, S.J.. Edited by Peter J. Weigel
No full textFor close to half a century, the work of Germain Grisez has been highly influential, and his writings continue to receive considerable attention from philosophers and theologians of diverse viewpoints. His co-author for this work is the professor and noted moral theologian Fr. Peter Ryan, S.J., currently the executive director of the Secretariat of Doctrine and Canonical Affairs of the United States Conference of Catholic Bishops (USCCB). These two eminent scholars explore fundamental questions about Christian eschatology, moral theory, the purpose of human life, and the promise of human fulfilment. The authors examine Christian teaching on the final destiny of persons, investigating the meaning of God's kingdom, the hope of the beatific vision, and the centrality of moral goodness and divine grace in one's final end. This work is an ideal source for students, scholars, ministers and lay persons interested in basic questions of Christian theology, the philosophy of religion, ethical theory, and Catholic doctrin
Murder on the mountain: author talk with Peter J. Wosh
No full textAuthor talk by Peter J. Wosh on May 5th, 2022, on his book, "Murder on the Mountain: crime, passion, and punishment in gilded age New Jersey.
Same Standards, Different Decisions
No full textThe QUIC and HTTP/3 protocols are quickly maturing together with
their implementations, though many of their low-level behaviours
are not yet well-understood. To help improve this, we empirically
compare 15 IETF QUIC+HTTP/3 implementations for advanced
features like Flow and Congestion Control, 0-RTT, Multiplexing,
and Packetization. We find a large heterogeneity between stacks,
discuss uncovered bugs and conclude that most implementations
are not fully optimized or validated yet. We argue that future work
must prioritize rigorous root-cause analysis of observed behaviours,
and show this is possible by employing our qlog and qvis tools.Robin Marx is a SB PhD fellow at FWO, Research Foundation Flan-ders, #1S02717N. The authors would like to thank our shepherdVaibhav Bajpai for his guidance during the review process. We alsoappreciate the help of Maarten Wijnants, Jens Bruggemans, DmitriTikhonov, Lucas Pardue, Maxime Piraux and Song Zhu in reviewingearlier versions of this wor
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