Imaging of moving targets with multi-static SAR using an overcomplete dictionary

This paper presents a method for imaging of moving targets using multi-static SAR by treating the problem as one of spatial reflectivity signal inversion over an overcomplete dictionary of target velocities. Since SAR sensor returns can be related to the spatial frequency domain projections of the scattering field, we exploit insights from compressed sensing theory to show that moving targets can be effectively imaged with transmitters and receivers randomly dispersed in a multi-static geometry within a narrow forward cone around the scene of interest. Existing approaches to dealing with moving targets in SAR solve a coupled non-linear problem of target scattering and motion estimation typically through matched filtering. In contrast, by using an overcomplete dictionary approach we effectively linearize the forward model and solve the moving target problem as a larger, unified regularized inversion problem subject to sparsity constraints.Comment: This work has been submitted to IEEE Journal on Selected Topics in Signal Processing (Special Issue on MIMO Radar and Its Applications) for possible publicatio

1923 Ruby Yearbook

A digitized copy of the 1923 Ruby, the Ursinus College yearbook.https://digitalcommons.ursinus.edu/ruby/1025/thumbnail.jp

1938 Ruby Yearbook

A digitized copy of the 1938 Ruby, the Ursinus College yearbook.https://digitalcommons.ursinus.edu/ruby/1040/thumbnail.jp

1924 Ruby Yearbook

A digitized copy of the 1924 Ruby, the Ursinus College yearbook.https://digitalcommons.ursinus.edu/ruby/1026/thumbnail.jp

UNION (Reino Unido). Inglaterra. Canal. Canales. 1792?. 1:64400

Comprende parte de los condados ingleses de Leicestershire y NorthamptonshireEscalas gráficas de 9 millas y 72 estadios [= 22,5 cm]Orografía a trazosTabla de signos convencionales para indicar el trazado del canal proyectado, distintos tipos de caminos y molinos de aguaConsta una tabla con datos referentes a las dimensiones y capacidad de los tramos de la obra proyectadaForma parte de la Colección Mendoz

Growth of the tropical scallop, Euvola (Pecten) ziczac, in bottom and suspended culture in the Golfo de Cariaco, Venezuela

We compared the growth of the scallop Euuolu (Pecten) ziczuc (L.) in three situations which potentially could be used for commercial culture, in cages maintained in suspension, in cages on the bottom and in cages partly buried in a sediment bottom. The latter permitted the scallops to bury themselves as in their natural habitat. Throughout the 7-month study, growth, as measured by shell length and muscle mass, was by far superior for scallops in the partly buried cages. Possible explanations for this are ( 1) that the scallops are stressed by enclosures which prevent them from burying themselves and (2) that organic material at the sediment/water interface is an important food resource and E. ziczac has better access to this when it buries itself flush with the bottom. The timing of gonadal growth and spawning varied markedly among treatments. Some spawnings coincided with temperature increases but others did not. Differences between scallops in suspension compared to those in bottom treatments suggested that reproduction is as much controlled by conditions in the immediate environment of the scallops as by large-scale environmental factors. Survival was highest for the scallops maintained in partly buried cages

Dynamic Performance of Cantilevered Sign Trusses for Fatigue

Cantilevered overhead sign structures (COSS) experience cyclic loading due to stochastic loads such as natural wind gusts (NWG). Wind loading can produce large deflections in the cantilever and large-magnitude stresses can develop at the box-type connection between the cantilevered arm and mast where fatigue performance is a concern. Modifications to the sign structures pose further concerns as changes to the aerodynamic properties could have unintended consequences. A design consideration of COSS is serviceability of the sign through use of a steel grate walkway that workers can use for maintenance on the sign. The steel grate walkways on COSS are rarely used for maintenance anymore, hence are being removed by multiple state DOTs to prevent vandalism. However, the impact on COSS with the removal of the walkways is unknown. This report describes an investigation in which the dynamic and aerodynamic properties of COSS was studied, and the effect of the walkway presence on structural response was explored. Computer simulations of 32 different COSS configurations were carried out to see the effect of the grate removal on the natural frequency and the mass of the overall structural system. Aerodynamic performance was considered through the use of computational fluid dynamics (CFD) and experimental testing, where wind pressure on the sign in both axial directions and effects of vortex shedding were examined. Findings include: 1) the walkway had a minimal effect on the system’s mass and natural frequencies, 2) the walkway had a minimal influence on the wind-induced force on the sign, 3) vortex shedding was not exacerbated with removal of a walkway attachment, and 4) walkway removal did not significantly change stress magnitudes at the connection between the cantilever and mast. Based on these findings, the removal of walkways from KDOT’s COSS was not found to problematic.The Kansas Department of Transportatio

Senior Supervisors Group- Risk Management Lessons from the Global Banking Crisis of 2008

Studies referenced in the exercise include Senior Supervisors Group, Observations on Risk Management Practices during the Recent Market Turbulence (March 2008); Financial Stability Forum, Report of the Financial Stability Forum on Enhancing Market and Institutional Resilience (April 2008); Institute of International Finance, Final Report of the IIF Committee on Market Best Practices: Principles of Conduct and Best Practice Recommendations (July 2008); and Credit Risk Management Policy Group III, Containing Systemic Risk: The Road to Reform (August 2008). In addition, U.S. firms were asked to consider recommendations and observations in President\u27s Working Group on Financial Markets, Policy Statement on Financial Market Developments (March 2008)

Neural Networks for the Web Services Classification

This article introduces a n-gram-based approach to automatic classification of Web services using a multilayer perceptron-type artificial neural network. Web services contain information that is useful for achieving a classification based on its functionality. The approach relies on word n-grams extracted from the web service description to determine its membership in a category. The experimentation carried out shows promising results, achieving a classification with a measure F=0.995 using unigrams (2-grams) of words (characteristics composed of a lexical unit) and a TF-IDF weight

Using Big Data to determine potential dropouts in higher education

In higher education, student dropout is a relevant problem, not just in Latin America but also in developed countries. Although there is no consensus to measure the education quality, one of the important indicators of university success is the time to graduation (TTG), which is directly related to student dropout [1]. Global estimates put this dropout rate at 42% [2]. In the United States, this rate is around 30% and represents a loss of 9 billion dollars in the education of these students [3]. However, desertion not only affects the quality of education and the economy of a country, but also has effects on the development of society, since society demands the contributions derived from the population with higher education such as: innovation, knowledge production and scientific discovery [4]. Using basic statistical learning techniques, this paper presents a simple way to predict possible dropouts based on their demographic and academic characteristics