1,720,958 research outputs found
An innovative reputation system for trustworthy and secure vehicle-to-vehicle communication
Get PDFVehicular Ad Hoc Networks (VANETs) are a promising technology that ensures secure and efficient transportation by allowing vehicles to seamlessly communicate with each other and with infrastructure to share real-time information and make better decisions while travelling. However, determining which information is accurate under certain circumstances, such as in the event of an accident, may become challenging when receiving messages from multiple nearby vehicles. Therefore, trusting these messages requires a reliable and secure system to guard against insider attackers, who may intentionally send misleading information, particularly in scenarios without extensive Roadside Units (RSUs) to mediate these exchanges.
Existing standards, such as the Security Credential Management System (SCMS), supply vehicles with pseudonym certificates to meet security and privacy requirements. However, this system has difficulties ensuring that the revoked certificates are updated in regions with limited connectivity access. In order to solve this issue, this research proposes a novel reputation system to maximise the chance of making an accurate decision based on the received messages. This builds upon existing standards and specifications to integrate an innovative Pre-Signature scheme for effective reputation dissemination.
The Pre-Signature scheme enables vehicles to assess dynamically and rely on the most trustworthy information available, even in challenging and limited environments. The research develops realistic simulations of 24-hour rural scenarios to replicate real-time communication challenges. The simulation work also includes accident and malicious attack scenarios, thus giving a wide-ranging performance evaluation of the Pre-Signature scheme under typical infrastructural constraints. The results revealed a significant enhancement in decision-making accuracy with conflicting information, achieving an improvement ranging from 36% in Accidents and 44.4% in No-Accident scenarios in a rural environment compared to the existing certification system.
Finally, a new reporting scheme, Distributed Reputation for Accurate Vehicle Misbehaviour Reporting (DRAMBR), is proposed to improve reporting efficiency in disconnected areas by effectively mitigating false reports while distinguishing between honest reporters, system errors and malicious behaviours. Experimental results indicate that the DRAMBR system achieves 98% effectiveness in distinguishing between behaviours, highlighting its overall performance.
The contribution of the thesis is related to the development of VANETs, in particular, to improve the reliability and efficiency of V2V communications in critical areas, enabling safer, more secure, and efficient transport networks
An innovative reputation system for trustworthy and secure vehicle-to-vehicle communication
Get PDFVehicular Ad Hoc Networks (VANETs) are a promising technology that ensures secure and efficient transportation by allowing vehicles to seamlessly communicate with each other and with infrastructure to share real-time information and make better decisions while travelling. However, determining which information is accurate under certain circumstances, such as in the event of an accident, may become challenging when receiving messages from multiple nearby vehicles. Therefore, trusting these messages requires a reliable and secure system to guard against insider attackers, who may intentionally send misleading information, particularly in scenarios without extensive Roadside Units (RSUs) to mediate these exchanges.
Existing standards, such as the Security Credential Management System (SCMS), supply vehicles with pseudonym certificates to meet security and privacy requirements. However, this system has difficulties ensuring that the revoked certificates are updated in regions with limited connectivity access. In order to solve this issue, this research proposes a novel reputation system to maximise the chance of making an accurate decision based on the received messages. This builds upon existing standards and specifications to integrate an innovative Pre-Signature scheme for effective reputation dissemination.
The Pre-Signature scheme enables vehicles to assess dynamically and rely on the most trustworthy information available, even in challenging and limited environments. The research develops realistic simulations of 24-hour rural scenarios to replicate real-time communication challenges. The simulation work also includes accident and malicious attack scenarios, thus giving a wide-ranging performance evaluation of the Pre-Signature scheme under typical infrastructural constraints. The results revealed a significant enhancement in decision-making accuracy with conflicting information, achieving an improvement ranging from 36% in Accidents and 44.4% in No-Accident scenarios in a rural environment compared to the existing certification system.
Finally, a new reporting scheme, Distributed Reputation for Accurate Vehicle Misbehaviour Reporting (DRAMBR), is proposed to improve reporting efficiency in disconnected areas by effectively mitigating false reports while distinguishing between honest reporters, system errors and malicious behaviours. Experimental results indicate that the DRAMBR system achieves 98% effectiveness in distinguishing between behaviours, highlighting its overall performance.
The contribution of the thesis is related to the development of VANETs, in particular, to improve the reliability and efficiency of V2V communications in critical areas, enabling safer, more secure, and efficient transport networks
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
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
Leveraging reputation for enhanced decision accuracy in vehicle-to-vehicle communications under limited infrastructure
Get PDFVehicle-to-Vehicle (V2V) networking enhances transportation safety and efficiency by enabling vehicles to share alerts. However, malicious vehicles may inject false messages, leading to disputes. While certificates help ensure security, Certificate Revocation List (CRLs) may be outdated in low-connectivity areas, making it hard to verify conflicting reports. Reputation systems, using a pre-signature scheme, can aid decision-making even in infrastructure-limited environments.In this paper, we provide the mechanisms to use reputation in areas with low/no connectivity, whilst allowing for pseudonymous certificates to verify message authenticity without breaking privacy. The approach is integrated into the existing Security Credential Management System (SCMS), a framework for managing digital certificates for secure V2V communication.Our simulations evaluate the security performance of our proposed mechanism, with offline available reputation, against plain SCMS certificate management that rely solely on CRL to block malicious vehicles. The results are achieved by integrating vehicular simulation tools like SUMO, OMNeT++, and Veins, to evaluate the V2V communications in each system under two conditions (Accident and No accident) ensuring a comprehensive system evaluation.The proposed scheme improves accuracy in decision-making with conflicting information by 36% in accidents and 44.4% in No-Accident situations in a rural environment
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
- …
