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Wireless systems are becoming increasingly pervasive and securing these systems has been challenging, in large part due to the unique properties associated with wireless communications. Securing these networks has traditionally been approached by taking a conventional approach involving cryptographic protocols. Such an approach inherently seeks to secure the wireless network at the link layer and above, and consequently fails to leverage the most unique characteristic of wireless communication: its physical layer. Securing Wireless Communications at the Physical Layer is a compilation of contributions by experts in wireless communications and security, and presents state-of-the-art results that examine the challenge of introducing security at the physical layer of a wireless system. Throughout this book there is an underlying theme that the rich multipath environment that is typical of wireless scenarios supports the establishment of new security services at the physical layer, including new mechanisms that establish cryptographic keys, that support communication with assured confidentiality, and that can authenticate transmitters in mobile environments. The book takes a holistic approach to covering topics related to physical layer security solutions, with contributions ranging from the theoretical underpinnings behind secure communications to practical systems validations that have been performed on real wireless systems. The book also covers topics related to ensuring that cooperative wireless communications at the physical layer is trustworthy. Additionally, the emerging area of modulation forensics, whereby a device is able to identify the modulation format being employed by other devices is explored. Securing Wireless Communications at the Physical Layer will serve as a valuable reference to engineers and researchers in the fields of security and wireless communications.

Electrical engineering --- Applied physical engineering --- Mass communications --- Programming --- Information systems --- Computer. Automation --- DIP (documentimage processing) --- beeldverwerking --- cryptografie --- spraaktechnologie --- informatica --- informatietechnologie --- elektrotechniek --- communicatietechnologie --- signaalverwerking

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In today's world of specialization, people are attempting to protect the Earth's fragile state by swapping limousines for hybrids and pesticide-laced foods for organic produce. At other times, environmental awareness is translated into public relations gimmicks or trendy commodities. Moreover, simplistic policies, like single-species protection or planting ten trees for every tree cut down, are touted as bureaucratic or industrial panaceas. Because today's decisions are tomorrow's consequences, every small effort makes a difference, but a broader understanding of our environmental problems is necessary to the development of sustainable ecosystem policies. In Trees, Truffles, and Beasts, Chris Maser, Andrew W. Claridge, and James M. Trappe make a compelling case that we must first understand the complexity and interdependency of species and habitats from the microscopic level to the gigantic. Comparing forests in the Pacific Northwestern United States and Southeastern mainland of Australia, the authors show how easily observable speciesùtrees and mammalsùare part of a complicated infrastructure that includes fungi, lichens, and organisms invisible to the naked eye, such as microbes. Eminently readable, this important book shows that forests are far more complicated than most of us might think, which means simplistic policies will not save them. Understanding the biophysical intricacies of our life-support systems just might.

Forest ecology. --- Forest ecology - Australia. --- Forest ecology -- Australia. --- Forest ecology - United States. --- Forest ecology -- United States. --- Forest ecology --- Earth & Environmental Sciences --- Ecology --- Forests and forestry --- Forest ecosystems

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Network-Aware Security for Group Communications fills a growing need in the research community for a reference that describes the state-of-the-art in securing group communications in emerging networks and for future applications. The growth of multi-user services makes it essential that a complementary suite of security solutions are deployed in order to protect these services from a broad spectrum of security threats that are unique to group communications. This book is focused on tailoring security solutions to the underlying network architecture (such as the wireless cellular network, or ad hoc and sensor networks), or to targeted applications using methods tailored for that application (such as multimedia multicasts). The authors focus the discussion on two fundamental security issues for group communications: providing efficient key management for providing confidentiality, and providing authentication for group services.

Mass communications --- Computer science --- Computer architecture. Operating systems --- Information systems --- Computer. Automation --- beeldverwerking --- DES (data encryption standard) --- cryptologie --- computerbesturingssystemen --- programmatielogica --- OS (operating system) --- computernetwerken --- communicatietechnologie --- signaalverwerking

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This disorder transcends multiple disciplines and demands a team approach to improve knowledge and treatment. The highly experienced internationally recognized authors have updated every section and added many new chapters, including some on genetic abnormalities in virus and host seen in PTLDs. In this successor edition, there is a completely new section on PTLDs after hematopoietic stem cell transplantation. The newest PTLD classifications and current treatment paradigms that reflect recently conducted international trials are fully incorporated. As technologies have advanced, this book provided state-of-the-art new diagnostic and prognostic information. Post-Transplant Lymphoproliferative Disorders 2nd Edition is designed to be a valuable reference for oncologists and all transplant professionals, such as surgeons, nephrologists, cardiologists, hepatologists/gastroenterologists, pulmonologists, infectious disease specialists, pathologists, as well as interns and residents in training in these specialists. It provides these professionals with comprehensive and up-to-date information that guides their management of transplant patients before and after transplant, with and without PTLD. .

Oncology. Neoplasms --- Nefrology --- Surgery --- orgaantransplantatie --- nefrologie --- oncologie --- chirurgie --- transplantaties