Booz Allen Hamilton

About: Booz Allen Hamilton is a company organization based out in Tysons Corner, Virginia, United States. It is known for research contribution in the topics: Air traffic control & Population. The organization has 1337 authors who have published 1454 publications receiving 35328 citations. The organization is also known as: Booz Allen & Booz Allen Hamilton Inc..

Sensor networks: evolution, opportunities, and challenges

Abstract: Wireless microsensor networks have been identified as one of the most important technologies for the 21st century. This paper traces the history of research in sensor networks over the past three decades, including two important programs of the Defense Advanced Research Projects Agency (DARPA) spanning this period: the Distributed Sensor Networks (DSN) and the Sensor Information Technology (SensIT) programs. Technology trends that impact the development of sensor networks are reviewed, and new applications such as infrastructure security, habitat monitoring, and traffic control are presented. Technical challenges in sensor network development include network discovery, control and routing, collaborative signal and information processing, tasking and querying, and security. The paper concludes by presenting some recent research results in sensor network algorithms, including localized algorithms and directed diffusion, distributed tracking in wireless ad hoc networks, and distributed classification using local agents.

ZETATM analysis A new model to identify bankruptcy risk of corporations

Abstract: The paper explores the development of a bankruptcy classification model which incorporates comprehensive inputs with respect to discriminant analysis and utilizes a sample of bankrupt firms essentially covering the period 1969–1975. Financial statement data and market related measures are transformed along guidelines suggested by traditional security analysis to promote comparability of companies and to reflect the most recent reporting standards so as to make the model relevant to future analysis. The results of the study are compared with alternative bankruptcy classification strategies via the explicit introduction of prior probabilities of group membership, observed accuracies, and estimates of costs of errors in misclassification. The latter is based on cost estimates derived from commercial bank lending errors. The results of the study indicate potential significant application to credit worthiness assessment, portfolio management, and to external and internal performance analysis.

Vehicular Networking: A Survey and Tutorial on Requirements, Architectures, Challenges, Standards and Solutions

Abstract: Vehicular networking has significant potential to enable diverse applications associated with traffic safety, traffic efficiency and infotainment. In this survey and tutorial paper we introduce the basic characteristics of vehicular networks, provide an overview of applications and associated requirements, along with challenges and their proposed solutions. In addition, we provide an overview of the current and past major ITS programs and projects in the USA, Japan and Europe. Moreover, vehicular networking architectures and protocol suites employed in such programs and projects in USA, Japan and Europe are discussed.

Status and challenges in enabling the lithium metal electrode for high-energy and low-cost rechargeable batteries

Abstract: Enabling the reversible lithium metal electrode is essential for surpassing the energy content of today’s lithium-ion cells. Although lithium metal cells for niche applications have been developed already, efforts are underway to create rechargeable lithium metal batteries that can significantly advance vehicle electrification and grid energy storage. In this Perspective, we focus on three tasks to guide and further advance the reversible lithium metal electrode. First, we summarize the state of research and commercial efforts in terms of four key performance parameters, and identify additional performance parameters of interest. We then advocate for the use of limited lithium (≤30 μm) to ensure early identification of technical challenges associated with stable and dendrite-free cycling and a more rapid transition to commercially relevant designs. Finally, we provide a cost target and outline material costs and manufacturing methods that could allow lithium metal cells to reach 100 US$ kWh–1. Li metal batteries offer much hope for the future of high-energy storage systems. Albertus et al. survey the current status of research and commercial efforts, and discuss key metrics and measurements as well as cost issues in enabling high-performing lithium metal electrodes.

Attributed based access control (ABAC) for Web services

Abstract: For companies and government agencies alike, the emergence of Web services technologies and the evolution of distributed systems toward service oriented architectures (SOA) have helped promote collaboration and information sharing by breaking down "stove-piped" systems and connecting them via loosely coupled, interoperable system-to-system interfaces. Such architectures, however, also bring about their own security challenges that require due consideration. Unfortunately, the current information security mechanisms are insufficient to address these challenges. In particular, the access control models today are mostly static and coarsely grained; they are not well-suited for the service-oriented environments where information access is dynamic and ad-hoc in nature. This paper outlines the access control challenges for Web services and SOA, and proposes an attribute based access control (ABAC) model as a new approach, which is based on subject, object, and environment attributes and supports both mandatory and discretionary access control needs. The paper describes the ABAC model in terms of its authorization architecture and policy formulation, and makes a detailed comparison between ABAC and traditional role-based models, which clearly shows the advantages of ABAC. The paper then describes how this new model can be applied to securing Web service invocations, with an implementation based on standard protocols and open-source tools. The paper concludes with a summary of the ABAC model's benefits and some future directions.