Time filter

Source Type

Point of Rocks, MD, United States

Mateer T.D.,Howard Community College
12th Canadian Workshop on Information Theory, CWIT 2011 | Year: 2011

Dornstetter, Heydtmann, and Jensen have previously demonstrated that the Extended Euclidean algorithm and the Berlekamp-Massey algorithm are two equivalent methods used for solving the so-called Key Equation in BCH and Reed-Solomon decoding. This paper presents a new algorithm which makes this correspondence more explicit and is an improvement over each of the two algorithms. © 2011 IEEE. Source

Lyatskaya S.,Howard Community College | Lyatskaya S.,NASA | Lyatsky W.,Catholic University of America | Khazanov G.V.,NASA
Geophysical Research Letters | Year: 2014

An asymmetry in ionospheric conductivity between two hemispheres results in the formation of additional, interhemispheric field-aligned currents (FACs) flowing between conjugate ionospheres within two auroral zones. These interhemispheric currents are especially significant during summer-winter conditions when there is a significant asymmetry in ionospheric conductivity in two hemispheres. In such conditions, these currents may be comparable in magnitude with the Region 1 (R1) field-aligned currents. In this case, the R1 current is the sum of two FACs: one is going from/to the solar wind, and another is flowing between conjugate ionospheres. These interhemispheric currents can also cause the formation of auroras extended along the nightside polar cap boundary, which may be related to the so-called "double auroral oval." In this study, we present the results of analytical and numerical solutions for the interhemispheric currents and their effect on the Region 1 currents. © 2014. American Geophysical Union. All Rights Reserved. Source

Mackey E.,Childrens National Health Systems | Schweitzer A.,Center for Translational Science | Schweitzer A.,University of Maryland University College | Hurtado M.E.,MedStar Research Institute | And 5 more authors.
Journal of American College Health | Year: 2015

Objectives: To evaluate the feasibility and acceptability of an e-mail-delivered program to promote nutrition and physical activity in African American college students. Participants: Forty-seven students (76% female, aged 18-20 years). Methods: Students participated in a 24-week randomized controlled trial, receiving either general health information or the intervention focused on diet and physical activity. Results: At baseline, 80.9% and 76.0% of participants reported interest in improving diet and physical activity, respectively. Participants evidenced poor nutrition behaviors and 46% were overweight or obese. At 24 weeks, most participants (70% control, 84% intervention) were "somewhat" or "very" satisfied with the program. The program was feasible to administrate, with the exception of measurement of physical activity using accelerometers. Conclusions: An innovative e-mail-delivered program promoting positive health behaviors appears to be feasible and acceptable in African American college students. Further research is needed to evaluate program efficacy in this population, including prevention of excess weight gain. © 2015 Taylor & Francis Group, LLC. Source

Lyatskaya S.,Howard Community College | Lyatskaya S.,NASA | Khazanov G.V.,NASA | Zesta E.,NASA
Journal of Geophysical Research: Space Physics | Year: 2014

We present simulation results of the 3-D magnetosphere-ionosphere current system including the Region 1 and Region 2 field-aligned currents, ionospheric currents, and interhemispheric field-aligned currents flowing between the northern and southern conjugate ionospheres in the case of asymmetry in ionospheric conductivities in two hemispheres. The model shows that the interhemispheric currents can be an important part of the global 3-D current system in high-latitude ionosphere, especially during summer-winter months, when in winter ionosphere they can be comparable and even exceed both Region 1 and Region 2 currents. An important feature of these interhemispheric currents is that they link together processes in two hemispheres, so that the currents observed in one hemisphere can provide us with information about the currents in the opposite hemisphere. Although the interhemispheric currents might play a notable role in the total 3-D current system, they have not been sufficiently studied yet. The study of the contribution from the interhemispheric currents into the total 3-D current system allows us to improve understanding and forecasting of geomagnetic, auroral, and ionospheric disturbances in two hemispheres. ©2014. American Geophysical Union. All Rights Reserved. Source

Barnard R.W.,Texas Tech University | Lochman M.H.,Howard Community College | Solynin A.Y.,Texas Tech University
Computational Methods and Function Theory | Year: 2013

We consider the complex plane ℂ as a space filled by two different media, separated by the real axis ℝ. For a planar body (connected compact set) E in C, the sets E+=E∩{z:>0} and E-=E\{z:>0} will be considered as a "visible" part of E and an "invisible" part of E, respectively. In a recent paper of Barnard, Pearce and Solynin, the authors discussed the problem of estimating the maximum draft, min{:z∈E-}, from characteristics of the whole body E and characteristics of its "visible" part E+. Their study was focused on the general case of compact sets, i.e. they worked with sets E which are not necessarily convex. In this paper, we investigate the maximal draft of E as a function of the logarithmic capacity of E and the area of E+ under the more natural, yet also more difficult, assumption that E is convex. As a tool in our proof, we consider extremal problems for the related class of sectorial starlike functions. © Springer-Verlag Berlin Heidelberg 2013. Source

Discover hidden collaborations