Scientific Atlanta Inc is a Georgia-based manufacturer of cable television, telecommunications, and broadband equipment.Scientific Atlanta was founded in 1952 by a group of engineers from the Georgia Institute of Technology, and was purchased by Cisco Systems in 2005. Wikipedia.
IEEE National Radar Conference - Proceedings | Year: 2012
This paper will present an approach for implementing an airborne radar warning receiver (RWR) pulse data extraction (PDE) and processing technique capable of handling multiple time-coincident radio-frequency (RF) pulse input threat emitter signals received in a dense threat radar signal environment. The pulse data extraction technique is specifically developed to accommodate the RF to video response of current commercial-off-the-shelf (COTS) or militarized COTS (MOTS) extended-range detector logarithmic video amplifiers (ERDLVAs), including extracting signal information in the presence of device noise. The approach uses a combination of time-domain filtering, adjustable thresholds, and edge detection techniques combined with a four-quadrant data comparison to extract individual pulse data from overlapped multi-source and uncorrelated noisy pulse inputs, and the processed data output can be used as part of the presented PDE algorithm and also may provide pre-processing for currently used pulse deinterleaving and sorting methods. The developed technique has the potential to provide system response that is optimized for various threat environments via pre-deployment programming or continuous-time dynamic variations in the PDE. © 2012 IEEE.
Boothe V.L.,Scientific-Atlanta |
Boehmer T.K.,National Center for Environmental Health |
Wendel A.M.,Healthy Environmental |
Yip F.Y.,National Center for Environmental Health
American Journal of Preventive Medicine | Year: 2014
Context Exposure to elevated concentrations of traffic-related air pollutants in the near-road environment is associated with numerous adverse human health effects, including childhood cancer, which has been increasing since 1975. Results of individual epidemiologic studies have been inconsistent. Therefore, a meta-analysis was performed to examine the association between residential traffic exposure and childhood cancer. Evidence acquisition Studies published between January 1980 and July 2011 were retrieved from a systematic search of 18 bibliographic databases. Nine studies meeting the inclusion criteria were identified. Weighted summary ORs were calculated using a random effects model for outcomes with four or more studies. Subgroup and sensitivity analyses were performed. Evidence synthesis Childhood leukemia was positively associated (summary OR=1.53, 95% CI=1.12, 2.10) with residential traffic exposure among seven studies using a postnatal exposure window (e.g., childhood period or diagnosis address) and there was no association (summary OR=0.92, 95% CI=0.78, 1.09) among four studies using a prenatal exposure window (e.g., pregnancy period or birth address). There were too few studies to analyze other childhood cancer outcomes. Conclusions Current evidence suggests that childhood leukemia is associated with residential traffic exposure during the postnatal period, but not during the prenatal period. Additional well-designed epidemiologic studies that use complete residential history to estimate traffic exposure, examine leukemia subtypes, and control for potential confounding factors are needed to confirm these findings. As many people reside near busy roads, especially in urban areas, precautionary public health messages and interventions designed to reduce population exposure to traffic might be warranted. © 2014 American Journal of Preventive Medicine.
Fung I.C.-H.,Georgia Southern University |
Emerging Themes in Epidemiology | Year: 2014
Great progress has been made in mathematical models of cholera transmission dynamics in recent years. However, little impact, if any, has been made by models upon public health decision-making and day-to-day routine of epidemiologists. This paper provides a brief introduction to the basics of ordinary differential equation models of cholera transmission dynamics. We discuss a basic model adapted from Codeço (2001), and how it can be modified to incorporate different hypotheses, including the importance of asymptomatic or inapparent infections, and hyperinfectious V. cholerae and human-to-human transmission. We highlight three important challenges of cholera models: (1) model misspecification and parameter uncertainty, (2) modeling the impact of water, sanitation and hygiene interventions and (3) model structure. We use published models, especially those related to the 2010 Haitian outbreak as examples. We emphasize that the choice of models should be dictated by the research questions in mind. More collaboration is needed between policy-makers, epidemiologists and modelers in public health. © 2014 Fung; licensee BioMed Central Ltd.
Scientific-Atlanta | Date: 2011-06-10
Included are systems and methods for performing an internal operations test to a set top terminal (STT). At least one embodiment of a method includes creating a test pattern for testing video functionality of the STT, sending the created test pattern to a digital encoder, and converting the test pattern to an analog signal.
Scientific-Atlanta | Date: 2012-09-17
The present invention is directed towards a frequency modulated (FM) burst mode optical system that allows optical signals having a common wavelength provided by a plurality of FM burst mode optical transmitters to be passively combined onto a single optical fiber. A single FM optical receiver receives the combined signals and processes them accordingly. Each FM burst mode optical transmitter includes an FM modulator, is carrier detect circuit and a laser. The FM modulator modulates a carrier signal, such as a 1.21 GHz signal, with received reverse electrical signals. When a subcarrier signal is detected o the carrier detect circuit, the laser is turned and the frequency modulated carrier signal is used to intensity modulate a laser to provide an optical signal. Due to the burst-mode transmission of optical signals, the optical signals can be passively combined and transmitted to a single optical receiver.