The Airborne Surveillance Testbed (AST) program, managed by SMDC for BMDO, is a technology demonstration program that supports development, test, and evaluation of defensive systems to counter intercontinental and theater ballistic missiles (ICBMs and TBMs) and their warheads. The heart of the AST program is a Boeing 767 aircraft equipped with a Raytheon-built, large-aperture, multiband, high d...

Hypersonic endoatmospheric interceptors are presently under serious consideration for strategic and theater missile defenses. On board infrared seekers are planned for terminal guidance. It is desirable to perform seeker trade studies determining such things as expected S/N, tracking performance and optimum wavelength of operation. The dynamics of the interceptor/target trajectories combine wit...

A Redirection Botnet (RBnet) is a vast collection of compromised computers (called bots) used as a redirection/proxy infrastructure and under the control of a botmaster. We present the design, implementation and evaluation of a system called Redirection Botnet Seeker (RB-Seeker) for automatic detection of RBnets by utilizing three cooperating subsystems. Two of the subsystems are used to genera...

As data sources and data size proliferate, knowledge discovery from ‘Big Data’ is starting to pose several challenges. In this paper, we address a specific challenge in the practice of enterprise knowledge management while extracting actionable nuggets from diverse data sources of seemingly related information. In particular, we address the challenge of archiving knowledge gained through collab...

Recent studies show that humans engage in multitasking information behaviors, often in libraries, as they seek and search for information on more than one information task. Multitasking information behaviors may consist of library search and use behaviors, or database or Web search sessions on multiple information tasks. However, few human information behavior models of seeking, searching or us...

While the idea that contacts matter in finding a job is intuitively appealing, we still do not know-after decades of research-how and why strong ties benefit job seekers. To resolve this confusion, we need to theorize how specific characteristics of ties are related to the mechanisms that make job search through contacts effective. We have reasons to expect that, while a contact's motivation in...