Denial of Service in Voice Over IP Networks

In this paper we investigate denial of service (DoS) vulnerabilities in Voice over IP (VoIP) systems, focusing on the ITU-T H.323 family of protocols. We provide a simple characterisation of DoS attacks that allows us to readily identify DoS issues in H.323 protocols. We also discuss network layer DoS vulnerabilities that affect VoIP systems. A number of improvements and further research directions are proposed

Concert recording 2018-04-21b

[Track 1]. Gesänge des Harfners op. 12. I. Wer sich der Einsamkeit ergibt [Track 2]. II. Wer nie sein Brot mit Thränen ass [Track 3]. III. An die Türen will ich schleichen / Franz Schubert -- [Track 4]. Poème d\u27avril op. 14. I. Prélude [Track 5]. II. Sonnet matinal [Track 6]. III. Voici que les grans lys [Track 7]. IV. Riezvous [Track 8]. V. Vous aimerez demain [Track 9]. VI. Que l\u27heure est donc brève [Track 10]. VII. Sur la source [Track 11]. VIII. Adieu (Complainte) / Jules Massenet -- [Track 12]. Clear or cloudy [Track 13]. In darkness let me dwell / John Dowland -- [Track 14]. I Canti Della Sera. I. L\u27assiolo canta [Track 15]. II. Alba di luna sul bosco [Track 16]. III. Tristezza crepuscolare [Track 17]. IV. L\u27incontro / Francesco Santoliquido -- [Track 18]. A letter from Sullivan Ballou / John Kander

“The Ayn Rand School for Tots”: John Dewey, Maria Montessori, and Objectivist Educational Philosophy during the Postwar Years

Objectivism, the libertarian philosophy established by Ayn Rand during the postwar years, has attracted a great deal of attention from philosophers, political scientists, economists, and English professors alike in recent years, but it hasn’t received much notice from historians with an interest in education. This article will address that problem by discussing how Rand and her followers established a philosophy of education during the 1960s and 1970s that was based, in part, on vilifying the so-called collectivist ideas of John Dewey and lionizing the so-called individualist ideas of Maria Montessori. Unfortunately, the narrative that emerged during this time seriously misrepresented the ideas of both Dewey and Montessori, resulting in a somewhat distorted view of both educators

The Effect of Usability Research on the World Class Sports Website

User Interface Design (UI) and User Experience Design (UX) have become important parts of integrating the human experience into the design of digital products and services we use every day. Usability Research is the foundation of these two areas. It enables the research for improvement of quality interaction between a user and a company (UX) to be put into action by designing, prototyping and iterating the user interface (UI) before development. This project is a study of the effect that usability research has on the development of a new website for World Class Sports. It implements changes to the site layout and design based on the insights revealed by usability testing; the act of observing one person at a time doing specific tasks, so that confusing or frustrating issues can be detected

Foundations of Trusted Autonomy

This book establishes the foundations needed to realize the ultimate goals for artificial intelligence, such as autonomy and trustworthiness. Aimed at scientists, researchers, technologists, practitioners, and students, it brings together contributions offering the basics, the challenges and the state-of-the-art on trusted autonomous systems in a single volume. The book is structured in three parts, with chapters written by eminent researchers and outstanding practitioners and users in the field. The first part covers foundational artificial intelligence technologies, while the second part covers philosophical, practical and technological perspectives on trust. Lastly, the third part presents advanced topics necessary to create future trusted autonomous systems. The book augments theory with real-world applications including cyber security, defence and space

Hydrothermal activity lowers trophic diversity in Antarctic sedimented hydrothermal vents

Sedimented hydrothermal vents are those in which hydrothermal fluid vents through sediment and are among the least studied deep-sea ecosystems. We present a combination of microbial and biochemical data to assess trophodynamics between and within hydrothermally active and off-vent areas of the Bransfield Strait (1050–1647 m depth). Microbial composition, biomass and fatty acid signatures varied widely between and within vent and non-vent sites and provided evidence of diverse metabolic activity. Several species showed diverse feeding strategies and occupied different trophic positions in vent and non-vent areas and stable isotope values of consumers were generally not consistent with feeding structure morphology. Niche area and the diversity of microbial fatty acids reflected trends in species diversity and was lowest at the most hydrothermally active site. Faunal utilisation of chemosynthetic activity was relatively limited but was detected at both vent and non-vent sites as evidenced by carbon and sulphur isotopic signatures, suggesting that the hydrothermal activity can affect trophodynamics over a much wider area than previously thought

The Mass of the Black Hole in Cygnus X-1

Cygnus X-1 is a binary star system that is comprised of a black hole and a massive giant companion star in a tight orbit. Building on our accurate distance measurement reported in the preceding paper, we first determine the radius of the companion star, thereby constraining the scale of the binary system. To obtain a full dynamical model of the binary, we use an extensive collection of optical photometric and spectroscopic data taken from the literature. By using all of the available observational constraints, we show that the orbit is slightly eccentric (both the radial velocity and photometric data independently confirm this result) and that the companion star rotates roughly 1.4 times its pseudosynchronous value. We find a black hole mass of M =14.8\pm1.0 M_{\sun}, a companion mass of M_{opt}=19.2\pm1.9 M_{\sun}, and the angle of inclination of the orbital plane to our line of sight of i=27.1\pm0.8 deg.Comment: Paper II of three papers on Cygnus X-1; 27 pages including 5 figures and 3 tables, ApJ in pres