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Linear control laws are the most common control strategies, primarily due to their simplicity in both design and implementation. While there are a multitude of accepted techniques for designing linear control strategies for mitigating the response of structures due to external loads and excitations, there are no elegant and widely-applied nonlinear methods. While the optimal linear control law that...
This paper considers the problem of range-folded spread clutter mitigation in parallax (geographically remote) transmit (Tx) and receive (Rx) high-frequency (HF) over-the-horizon radar (OTHR). We demonstrate that MIMO radar technology could be applied to provide the required level of spread range-folded clutter.
Hash tables are efficient storage data structures widely used in many types of high-performance computer-related problems. In their design, optimal trade-offs must be made to accommodate for the specific characteristics of the application. In this paper we present lock-free low-false-negative (LFN) tables, a family of hash tables designed to address one such type of trade-off. LFN tables sacrifice...
In this paper we present the implementation of schemes for handling numerical quadrature for modeling curvilinear elements in both integral and differential equation formulations. The proposed integration schemes are based on singularity cancellation methods that can be extended to curvilinear elements for higher order electromagnetic modeling. The key of the proposed approaches is the introduction...
In the Method of Moments the evaluation of reaction integrals for the critical case when the source integral is (near-) singular usually employs the so-called “singularity subtraction” scheme for the source (inner) integral, followed by ordinary Gauss-Legendre quadrature for the resulting test (outer) integral. Recent literature has focused on the “singularity cancellation” scheme to evaluate the...
In this paper, we report on 1.2kV SiC MOSFETs rated to Tj, max=200°C, exhibiting improved performance characteristics across operating temperature. Our devices show stable, rugged and reliable operation when subjected to industry standard qualification tests. Low on-resistance of 35mOhm/79mOhm at Tj=25°C and 47mOhm/103mOhms at Tj=150°C are shown for 0.1cm2 and 0.2cm2 die. 1000 hour High-Temperature...
Understanding how to provide better surveillance in areas not viewable by visible light can arrive by modeling a virtual environment illuminated by photons in the non-visible spectrum and providing the mobile sensing platforms (MSPs) populating these environments with the tools to maximize their sensing capabilities. In order to enhance MSP sensing ability as well as enable MSP route path-planning,...
Mapping job titles to standardized occupation classification (SOC) codes is an important step in evaluating changes in health risks over time as measured in inspection databases. However, manual SOC coding is cost prohibitive for very large studies. Computer based SOC coding systems can improve the efficiency of incorporating occupational risk factors into large-scale epidemiological studies. We present...
We downloaded from GitHub, Inc., a portfolio of recently updated open source Scala projects containing 16,500 source files with 2.3 million lines of code and 223,000 methods written by hundreds of programmers. A related paper found in this "big data" of functional programs non-Gaussian distributions of lines of code and cyclomatic complexity and speculated that the distributions resembled...
This paper investigates indium antimonide based quantum well field effect transistors with 40 nm physical gate length. Self consistent T-CAD simulations are used to study the high-speed potential of InSb field-effect transistors and its suitable for high speed, very low power logic applications. At the room temperature electron mobility in excess of 30,000 cm2/V−1s−1 in material with sheet carrier...
Current satellite ocean altimeters include nadir-viewing, co-located 18–34 GHz microwave radiometers to measure wet-tropospheric path delay. Due to the large antenna footprint sizes at these frequencies, the accuracy of wet path retrievals is substantially degraded within 40 km of coastlines, and retrievals are not provided over land. A viable approach to improve their capability is to add wide-band...
SIMO channel identification problems arise in many practical applications, such as geolocation of HF sources propagated via the multi-layer ionosphere. In this case, memory of the channel (often modeled as a finite impulsive response (FIR) channel) makes the traditional assumptions on the channel estimation training samples as independent and identically distributed (i.i.d) invalid. This potentially...
Clostridium Botulinum neurotoxins (BoNTs) are the most lethal bacterial toxins known to humankind in nature. They present grave bioterrorism concern, especially within food supplies. The current pharmacotoxicological mouse bioassay accepted for detection of BoNT in food is laborious and expensive, lacks specificity, or may cause false alarm. It is highly desired to develop a rapid and sensitive on-site...
Diagnostic modalities by means of optical and/or near infrared femtosecond radiation through biological media can in principle be adapted to therapeutic applications. Of specific interest are soft tissue diagnostics and subsequent therapy through hard tissue such as bone. Femto-second laser pulses are delivered to hydroxyapatite representing bone, and photo-acoustic spectroscopy is presented in order...
This paper presents a simple and efficient, fully numerical integration scheme for the accurate evaluation of 4-D reaction integrals in the Method of Moments. The source integral is evaluated by a proper singularity cancellation scheme and the test integral via a quadrature formula specialized for the logarithmic singular behavior of the source integral near source domain boundaries. The proposed...
In this paper we present a simple and efficient, fully numerical technique for the evaluation of 4-D reaction integrals in the Method of Moments. The proposed approach is applied to the magnetic field integral equation (MFIE), where the gradient of the Helmholtz potential is present in the source integral; this case is more demanding than the electric field integral equation (EFIE) case. However,...
Application of femtosecond radiation for optical diagnostics through biological media offers opportunities for minimally invasive therapeutic applications. Interrogation of soft tissue behind hard tissue (e.g. bone) becomes feasible. The optical interaction for a femto-second laser pulse is investigated with a hydroxyapatite fixture in representation of bone. Photo-acoustic spectroscopy is preferably...
This paper builds on initial work on specifying robot motion using human-inspired motor programs. The existing method relies on a series of square wave torque pulses to actuate the robot. Using such pulses to produce motions with a robot will generate large peaks in absolute jerk — change in acceleration per unit time — which can damage the robot and decrease motion stability. This paper presents...
In this study, we provide comparative analysis of the so-called “threshold conditions” for conditional (deterministic, CML) and unconditional (stochastic, UML) maximum likelihood estimation. Specifically, we analyze SNR and sample support values where the accurate UML and CML DoA estimation starts to rapidly divert from the Cramér-Rao bound (CRB) due to the onset of severely erroneous DoA estimates...
Predicting the distributions of species is central to a variety of applications in ecology and conservation biology. With increasing interest in using electronic occurrence records, many modeling techniques have been developed to utilize this data and compute the potential distribution of species as a proxy for actual observations. As the actual observations are typically overwhelmed by non-occurrences,...
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