652 research outputs found
The IceCube Neutrino Observatory: Instrumentation and Online Systems
The IceCube Neutrino Observatory is a cubic-kilometer-scale high-energy
neutrino detector built into the ice at the South Pole. Construction of
IceCube, the largest neutrino detector built to date, was completed in 2011 and
enabled the discovery of high-energy astrophysical neutrinos. We describe here
the design, production, and calibration of the IceCube digital optical module
(DOM), the cable systems, computing hardware, and our methodology for drilling
and deployment. We also describe the online triggering and data filtering
systems that select candidate neutrino and cosmic ray events for analysis. Due
to a rigorous pre-deployment protocol, 98.4% of the DOMs in the deep ice are
operating and collecting data. IceCube routinely achieves a detector uptime of
99% by emphasizing software stability and monitoring. Detector operations have
been stable since construction was completed, and the detector is expected to
operate at least until the end of the next decade.Comment: 83 pages, 50 figures; updated with minor changes from journal review
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Satellite-Based Communications Security: A Survey of Threats, Solutions, and Research Challenges
Satellite-based Communication systems are gaining renewed momentum in
Industry and Academia, thanks to innovative services introduced by leading tech
companies and the promising impact they can deliver towards the global
connectivity objective tackled by early 6G initiatives. On the one hand, the
emergence of new manufacturing processes and radio technologies promises to
reduce service costs while guaranteeing outstanding communication latency,
available bandwidth, flexibility, and coverage range. On the other hand,
cybersecurity techniques and solutions applied in SATCOM links should be
updated to reflect the substantial advancements in attacker capabilities
characterizing the last two decades. However, business urgency and
opportunities are leading operators towards challenging system trade-offs,
resulting in an increased attack surface and a general relaxation of the
available security services. In this paper, we tackle the cited problems and
present a comprehensive survey on the link-layer security threats, solutions,
and challenges faced when deploying and operating SATCOM systems.Specifically,
we classify the literature on security for SATCOM systems into two main
branches, i.e., physical-layer security and cryptography schemes.Then, we
further identify specific research domains for each of the identified branches,
focusing on dedicated security issues, including, e.g., physical-layer
confidentiality, anti-jamming schemes, anti-spoofing strategies, and
quantum-based key distribution schemes. For each of the above domains, we
highlight the most essential techniques, peculiarities, advantages,
disadvantages, lessons learned, and future directions.Finally, we also identify
emerging research topics whose additional investigation by Academia and
Industry could further attract researchers and investors, ultimately unleashing
the full potential behind ubiquitous satellite communications.Comment: 72 page
The role of space in the security and defence policy of Turkey. A change in outlook: Security in space versus security from space
Space and security domains are strongly related with each other. Nowadays, space is an indispensable part of security and defence policy, and it is increasingly becoming a critical infrastructure for strategic Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance (C4ISR) systems. However, space is vulnerable itself to the new space threats. This study reviews the current and near future space role in Turkey's security and defence policy and aims to address the threats against space based capabilities. To provide security from space, space based systems shall themselves need to be secure in space to warrant the security. The concept of security from space starts with space security, in other words the security in space. This paper also highlights the emerging technological opportunities for these space threats to be secure in space in order to provide the security from space. According to the relevant taxonomy, a categorized opportunity proposal for more robust and resilient space/satellite projects' architecture is proposed for Turkey
From native to cross-platform hybrid development : CodeGT, design and development of a mobile app for ERP
The current trend towards mobility of individuals, together with the exponential
growth of the number of mobile devices led the market to a boom in the demand for the
development of mobile applications. Moreover, with the expansion and heterogeneity of
the mobile devices and platforms, software companies need to search for faster and
cheaper ways to develop applications that can span as many devices as possible to capture
the market. Currently, the Android and iOS Operating Systems roughly share and
dominate the mobile market, with timid expressions of other competitors. Each of these
mobile operating systems were developed using their own languages, strategy and SDKs
for development of applications using their libraries – known as Native apps. On the other
hand, the evolution of HTML5, CSS and JavaScript created generic alternatives to create
mobile apps that run on devices on all operating systems, although lacking the capability
to access the device’s full potential. Alongside came the new Hybrid cross-platform
development frameworks, which try to take the best of both worlds.
This dissertation describes the evolution of the different mobile app development
approaches and the state-of-the-art in their development techniques, and compares them
with the Hybrid app approach, then highlighting the trends in mobile app development
using Hybrid platforms and their advantages. This research includes the development of
a mobile Hybrid application, CodeGT, which interacts with an Enterprise Resource
Planning (ERP) to access the Transport Documents registered in this ERP and access to
the code transmitted by the Portuguese Tax Authority (AT), therefore not requiring the
printing of documents and meeting a need of the business market. This application does
already have customer industry companies interested in it.As tendências atuais em direção à grande mobilidade dos indivíduos, juntamente com
o crescimento exponencial do número de dispositivos móveis, levaram ao enorme
crescimento na procura do desenvolvimento de aplicações móveis. Além disso, com a
expansão e heterogeneidade dos dispositivos e das plataformas móveis, as empresas de
desenvolvimento de software necessitam de encontrar formas mais rápidas e baratas de
desenvolver aplicações capazes de abranger o maior número de dispositivos para ir ao
encontro da elevada procura do mercado. Atualmente, os sistemas operativos Android e
iOS dividem e dominam o mercado de dispositivos móveis com expressões tímidas de
outros concorrentes. Cada um desses sistemas operativos móveis foi desenvolvido
especificamente para linguagens de programação e estratégias próprias e oferecem um
conjunto de ferramentas de desenvolvimento com as suas bibliotecas, para a criação de
aplicações nativas. Por outro lado, a evolução do HTML5, CSS e do JavaScript criaram
oportunidades para o surgimento de alternativas genéricas para criação de aplicações
multiplataforma que correm em todos os dispositivos e em todos os sistemas operativos,
mas sem a capacidade de aceder todo o potencial nativo do dispositivo. Paralelamente
surgiram as novas plataformas de desenvolvimento híbridas, que tentam tirar o melhor
partido dos dois mundos.
Esta dissertação descreve a evolução das diferentes abordagens no desenvolvimento
de aplicações móveis mais concretamente na utilização de ferramentas multiplataformas
para a criação de aplicações móveis híbridas e as suas vantagens. A pesquisa incluiu ainda
o desenvolvimento de uma aplicação móvel, CodeGT, desenvolvido numa plataforma
híbrida para interagir com um software ERP, acedendo aos Documentos de Transporte
registados nesse ERP, assim como ao código transmitido pela Autoridade Tributária
(AT), que assim dispensa a impressão de documentos e indo ao encontro de uma
necessidade do mercado. Esta aplicação já tem empresas clientes interessadas nela
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