1,720,955 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Supporting Diverse Customers and Prioritized Traffic in Next-Generation Passive Optical Networks
Get PDFThe already high demand for more bandwidth usage has been growing rapidly. Access network traffic is usually bursty in nature and the present traffic trend is mostly video-dominant. This motivates the need for higher transmission rates in the system. At the same time, the deployment costs and maintenance expenditures have to be reasonable. Therefore, Passive Optical Networks (PON) are considered promising next-generation access technologies. As the existing PON standards are not suitable to support future-PON services and applications, the FSAN (Full Service Access Network) group and the ITU-T (Telecommunication Standardization Sector of the International Telecommunication Union) have worked on developing the NG- PON2 (Next Generation PON 2) standard.
Resource allocation is a fundamental task in any PON and it is necessary to have an efficient scheme that reduces delay, maximizes bandwidth usage, and minimizes the resource wastage. A variety of DBA (Dynamic Bandwidth Allocation) and DWBA (Dynamic Wavelength and Bandwidth Allocation) algorithms have been proposed which are based on different PONs (e.g. EPON, GPON, XG-PON, 10G- EPON, etc.). But to our knowledge, no DWBA scheme for NG-PON2 system, with diverse customers and prioritized traffic, has been proposed yet. In this work, this problem is addressed and five different dynamic wavelength and bandwidth allocation (DWBA) schemes are proposed. First, mixed integer linear programming (MILP) models are developed to minimize the total delay of the high priority data. Due to the MILP’s high computational complexity, heuristic algorithms are developed based on the MILP model insights. The five heuristics algorithms are: No Block-Split Heuristic (NBH), Equal Block-Split Heuristic (EBH), Priority Based No Block-Split Heuristic (P-NBH), Priority Based Equal Block-Split Heuristic (P-EBH), and Priority Based Decider Block-Split Heuristic (P-DBH). Six priority classes of requests are introduced with the goal of minimizing the total delay for the high priority data and to lessen the bandwidth wastage of the system. Finally, experiments for the performance evaluation of the five DWBA schemes are conducted. The results show that P-NBH, P-EBH, P-DBH schemes show a 47.63% less delay and 30% of less bandwidth wastage on average for the highest priority data transmission than the schemes without priority support (NBH and EBH). Among these five schemes, NBH method has the highest delay, whereas EBH and P-EBH waste more bandwidth than the other schemes. P-DBH is the most efficient among the five because this scheme offers the lowest delay for high priority data and the minimum bandwidth wastage for lower priority ones.
Adviser: Byrav Ramamurth
Dynamic Defenses to Systematically Secure Exposed Attack Surfaces in Wireless Systems
Get PDFWhile modern wireless systems rely on strong encryption, this alone does not secure the entire attack surface, including exposed signal attributes, pre-authentication exchanges, and protocol metadata. This dissertation challenges the assumption that existing cryptographic protections are sufficient to protect these vulnerabilities. Signal attributes, including phase and amplitude variations due to modulation, are physical-layer characteristics of encrypted data communication that remain observable and exploitable for attacks like traffic analysis. The pre-authentication phase—during which session keys are negotiated and installed—is vulnerable to spoofing and denial-of-service attacks. Protocol metadata, such as operating channel, sender’s address and location, and timestamps, is unencrypted and can reveal behavioral or device-specific patterns. Adversaries exploit this information to fingerprint devices, disrupt connectivity, and impersonate infrastructure, even in networks with the latest security standards. Existing research often focuses on patching specific attacks rather than addressing the root cause: exposed surfaces that serve as advanced attack entry points. In this dissertation, we demonstrate how these surfaces enable sophisticated attacks and propose comprehensive, dynamic defenses to mitigate these threats. The first part of this dissertation focuses on modulation-level attacks. We demonstrate, for the first time, that existing obfuscation techniques designed to prevent classification can be defeated by persistent, adaptive sniffers due to the static nature of attack surfaces. In response, we introduce a dynamic camouflage approach combining moving target defense and cyber deception to obscure modulation schemes and detect evasion attempts in AI-based receivers. Specifically, the modulated symbols are first masked using small perturbations to make them appear to an adversary as if they originate from another modulation scheme, creating ambiguity about the modulation scheme. By deploying a pool of deep learning models and perturbation-generating techniques, our defense strategy keeps moving them as needed, making it difficult for adversaries to keep up with the evolving defense system over time. In parallel, we introduce a signal morphing strategy that produces high-entropy, statistically indistinguishable waveforms, rendering intercepted signals unclassifiable. This technique maintains bit error rates, requires no bandwidth overhead, and is compatible with both AI-based and conventional receivers across different wireless protocols with minimal computational cost. We evaluate both techniques using extensive simulations across multiple open-source datasets, as well as over-the-air experiments using a software-defined radio (SDR) testbed, demonstrating their robustness under real-world wireless conditions. The second part of the dissertation exposes and addresses vulnerabilities in the pre-authentication phase and protocol metadata in Wi-Fi systems. Specifically, we develop a formal symbolic model of the Wi-Fi pre-authentication phase, discovering new variants of man-in-the-middle and new denial-of-service attacks. Our findings were acknowledged by the Wi-Fi Alliance. To defend against these threats, we develop a cross-layer scheme that embeds signatures into preambles, at the physical layer, with a time-bound mechanism to authenticate access points (APs) and verify frame elements that expose important protocol metadata, protecting against spoofing and relaying. We evaluate our approach on an AP-SDR testbed, across different commercial devices, demonstrating its practical deployment. Finally, we verify its correctness and integrity using a model checker and a cryptographic protocol verifier. Taken together, our techniques pave the way for resilient, proactive defenses against adaptive, intelligent threats in wireless ecosystem
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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