Innocent Code

This book covers the most essential techniques for designing and building dependable distributed systems, from traditional fault tolerance to the blockchain technology. Topics include checkpointing and logging, recovery-orientated computing, replication, distributed consensus, Byzantine fault tolerance, as well as blockchain. This book intentionally includes traditional fault tolerance techniques so that readers can appreciate better the huge benefits brought by the blockchain technology and why it has been touted as a disruptive technology, some even regard it at the same level of the Internet. This book also expresses a grave concern on using traditional consensus algorithms in blockchain because with the limited scalability of such algorithms, the primary benefits of using blockchain in the first place, such as decentralization and immutability, could be easily lost under cyberattacks.

Antenna and EM Modeling with MATLAB Antenna Toolbox™ is a textbook on antennas intended for a one semester course. The core philosophy is to introduce the key antenna concepts and follow them up with full-wave modeling and optimization in the MATLAB Antenna Toolbox. Such an approach will enable immediate testing of theoretical concepts by experimenting in software. It also provides the direct path to independent research work. The fundamental families of antennas – dipoles, loops, patches, and traveling wave antennas – are discussed in detail, together with the antenna arrays. Internally, the toolbox uses the Method of Moments (the method of integral equation) for modeling metal and metal-dielectric antennas. Rao-Wilton-Glisson basis functions on triangular facets are used for the metal parts and edge basis functions on tetrahedra are used for the dielectric parts. Accurate semi-analytical calculations of near-field interactions assure good solution accuracy.

Mit der zunehmenden Nutzung von Cloud Computing h?ufen sich Cyberangriffe. Und auch andere Faktoren stellen ein Sicherheitsrisiko f?r das Cloud Computing dar – angefangen von technischen St?rungen ?ber Fehlkonfigurationen, Datenverlust, mangelnde Awareness der Mitarbeiter bis hin zu Compliance-Verletzungen. Mit Ver?nderung der Bedrohungslage lassen sich klassische Sicherheitskonzepte und -l?sungen nicht kurzerhand auf das Cloud-Umfeld ?bertragen bzw. bieten nicht mehr ausreichenden Schutz. Cloud-Sicherheit erfordert neue Konzepte und hochentwickelte Technologien. Das sind die Themen des Buches: – Technologischer und organisatorischer Wandel durch Cloud Computing – Ver?nderte Bedrohungslage durch Cloud-Nutzung – Verantwortlichkeiten in der Cloud-Nutzung – das Shared-Responsibility-Modell – Vorgehensweise zur Cloud-Migration unter sicherheitsrelevanten Aspekten – Vorgehensmodelle und Umsetzungskonzepte f?r sichere Hybrid, Public und Multi Clouds – Sicherheitskonzepte und -ma?nahmen der Cloud-Anbieter – Datenschutz und DSGVO-konforme Datenverschl?sselung – Umsetzung von Zero-Trust-Architekturen – Kritische Infrastrukturen: Grundlagen, Anforderungen und sicherheitsrelevante Umsetzungskonzepte – Best Practices zur automatischen Identifizierung und Behebung von Sicherheitsl?cken in AWS und in Microsoft Azure – Branchen- und anwendungsbezogene Beispiele aus der Praxis

Substrate-Integrated Millimeter-Wave Antennas for Next-Generation Communication and Radar Systems The first and only comprehensive text on substrate-integrated mmW antenna technology, state-of-the-art antenna design, and emerging wireless applications Substrate-Integrated Millimeter-Wave Antennas for Next-Generation Communication and Radar Systems elaborates the most important topics related to revolutionary millimeter-wave (mmW) technology. Following a clear description of fundamental concepts including substrate-­integrated waveguides and loss analysis, the text treats key design methods, prototyping techniques, and experimental setup and testing. The authors also highlight applications of mmW antennas in 5G wireless communication and next-generation radar systems. Readers are prepared to put techniques into practice through practical discussions of how to set up testing for impedance matching, radiation patterns, gain from 24GHz up to 325 GHz, and more.This book will bring readers state-of-the-art designs and recent progress in substrate-integrated mmW antennas for emerging wireless applications. Substrate-­Integrated ­Millimeter-Wave Antennas for Next-Generation Communication and Radar Systems is the first comprehensive text on the topic, allowing readers to quickly master mmW technology. This book:Introduces basic concepts such as metamaterials Huygens’s surface, zero-index structures, and pattern synthesisDescribes prototyping in the form of fabrication based on printed-circuit-board, low-temperature-co-fired-ceramic and micromachiningExplores applications for next-generation radar and imaging systems such as 24-GHz and 77-GHz vehicular radar systemsElaborates design methods including waveguide-based feeding network, three-dimensional feeding structure, dielectric loaded aperture antenna element, and low-sidelobe synthesisThe mmW is one of today’s most important emerging technologies. This book provides graduate students, researchers, and engineers with the knowledge they need to deploy mmW systems and develop new antenna designs with low cost, low loss, and low complexity.