Internet Protocol (IP) telephony is an alternative to the traditional Public Switched Telephone Networks (PSTN), and the Session Initiation Protocol (SIP) is quickly becoming a popular signaling protocol for VoIP-based applications. SIP is a peer-to-peer multimedia signaling protocol standardized by the Internet Engineering Task Force (IETF), and it plays a vital role in providing IP telephony services through its use of the SIP Proxy Server (SPS), a software application that provides call routing services by parsing and forwarding all the incoming SIP packets in an IP telephony network. SIP Proxy Server Performance closely examines key aspects to the efficient design and implementation of SIP proxy server architecture. Together, a strong design and optimal implementation can enable significant enhancements to the performance characteristics of SPS. Since SPS performance can be characterized by the transaction states of each SIP session, the book analyzes an existing M/M/1-network performance model for SIP proxy servers in light of key performance benchmarks, such as the average response time for processing the SIP calls and the average number of SIP calls in the system. It also presents several other real-world industrial case studies to aid in further optimizations. This book is intended for researchers, practitioners and professionals interested in optimizing SIP proxy server performance. Professionals working on other VoIP solutions will also find the book valuable.
“Designing for Network and Service Continuity in Wireless Mesh Networks” describes performance predictability of the new wireless mesh network paradigm, and describes considerations in designing networks from the perspective of survivability and service continuity metrics. The work provides design insights for network design researchers and industry professionals. It includes designs for new mesh networks and extensions of existing networks with predictable performance.
Rudra Chaudhuri's book examines a series of crises that led to far-reaching changes in India's approach to the United States, defining the contours of what is arguably the imperative relationship between America and the global South. Forged in Crisis provides a fresh interpretation of India's advance in foreign affairs under the stewardship of Prime Ministers Jawaharlal Nehru, Indira Gandhi, Atal Bihari Vajpayee, and finally, Manmohan Singh. It reveals the complex and distinctive manner in which India sought to pursue at once material interests and ideas, while meticulously challenging the shakier and largely untested reading of 'non-alignment' palpable in most works on Indian foreign policy and international relations. From the Korean War in 1950 to the considered debate within India on sending troops to Iraq in 2003, and from the loss of territory to China and the subsequent talks on Kashmir with Pakistan in 1962-63 to the signing of a civil nuclear agreement with Washington in 2008, Chaudhuri maps Indian negotiating styles and behaviour and how these shaped and informed decisions vital to its strategic interest, in turn redefining its relationship with the United States.
Who gets to be American? -- Mozumdar crosses the Pacific -- The American dream -- Where are you from? -- Defining whiteness -- The differences between daylight and darkness -- The dilemma -- Return to Hindoo Alley -- Freedom fighters -- Citizenship on trial -- The aftermath -- The path to acceptance -- War -- Resolution.
This book presents a novel, generalized approach to the design of nonlinear state feedback control laws for a large class of underactuated mechanical systems based on application of the block backstepping method. The control law proposed here is robust against the effects of model uncertainty in dynamic and steady-state performance and addresses the issue of asymptotic stabilization for the class of underactuated mechanical systems. An underactuated system is defined as one for which the dimension of space spanned by the configuration vector is greater than that of the space spanned by the control variables. Control problems concerning underactuated systems currently represent an active field of research due to their broad range of applications in robotics, aerospace, and marine contexts. The book derives a generalized theory of block backstepping control design for underactuated mechanical systems, and examines several case studies that cover interesting examples of underactuated mechanical systems. The mathematical derivations are described using well-known notations and simple algebra, without the need for any special previous background in higher mathematics. The chapters are lucidly described in a systematic manner, starting with control system preliminaries and moving on to a generalized description of the block backstepping method, before turning to several case studies. Simulation and experimental results are also provided to aid in reader comprehension.
The future of Internet security doesn’t lie in doing more of the same. It requires not only a new architecture, but the means of securing that architecture. Two trends have come together to make the topic of this book of vital interest. First, the explosive growth of the Internet connections for the exchange of information via networks increased the dependence of both organizations and individuals on the systems stored and communicated. This, in turn, has increased the awareness for the need to protect the data and add security as chief ingredient in the newly emerged architectures. Second, the disciplines of cryptography and network security have matured and are leading to the development of new techniques and protocols to enforce the network security in Future Internet. This book examines the new security architectures from organizations such as FIArch, GENI, and IETF and how they’ll contribute to a more secure Internet.
This is the first comprehensive book on the rivers of the Ganga-Brahmaputra-Meghna delta. This volume covers all aspects of this highly populated region including land conflicts and environmental impacts such as the Indo-Bangladesh conflict over sharing of trans-boundary water. This book addresses the topic from a highly interdisciplinary perspective covering areas of geography, geology, environment, history, archaeology, sociology and politics of the Bengal region. The book appeals to a wide range of audiences from India, Bangladesh and the international community. The style of presentation makes it easily suitable for students, researchers and interested laymen.
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