Keyword: Optimization

Briefs: Electronics & Computers

A multi-stage automated target recognition (ATR) system has been designed to perform computer vision tasks with adequate proficiency in mimicking human vision. The system is able to detect,...

Briefs: Electronics & Computers
Special Component Designs for Differential-Amplifier MMICs

Special designs of two types of electronic components — transistors and transmission lines — have been conceived to optimize the performances of these components as parts of waveguide-embedded differential-amplifier monolithic microwave integrated circuits (MMICs) of the type...

Articles: Electronics & Computers

Many scientific, technical and engineering applications in finance, medical imaging, modeling, simulation,...

Application Briefs: Lighting
Ocean LED, Nuneaton, UK
Proto Labs, Maple Plain, MN

Richard Sant, Chief Designer at OceanLED, sought a fast and flexible way to make low-cost, high-quality components for the firm’s latest LED...

Products: Lighting
Online LED Design Tool

National Semiconductor (Santa Clara, CA) has introduced the WEBENCH® LED Architect, which enables novice and expert designers to perform real-time comparisons and optimize complex lighting systems for performance, size, and cost. To start a design, the designer enters desired light output (lumens) and adjusts...

Briefs: Physical Sciences
Aerogel-Positronium Technology for the Detection of Small Quantities of Organic and/or Toxic Materials

The Ps-aerogel system [Ps is positronium (an electron-positron-hydrogen-like atom)] has been evaluated and optimized as a potential tool for planetary exploration missions. Different configurations of use were assessed, and the results provide...

Briefs: Electronics & Computers
Robust Optimization Design Algorithm for High-Frequency TWTs

Traveling-wave tubes (TWTs), such as the Ka-band (26-GHz) model recently developed for the Lunar Reconnaissance Orbiter, are essential as communication amplifiers in spacecraft for virtually all near- and deep-space missions. This innovation is a computational design algorithm that,...

Articles: Electronics & Computers

Historically, processors from the PowerPC® family, now known as Power Architecture® processors, have been the dominant choice for implementing Digital...

Briefs: Electronics & Computers
High-Performance CCSDS Encapsulation Service Implementation in FPGA

The Consultative Committee for Space Data Systems (CCSDS) Encapsulation Service is a convergence layer between lower-layer space data link framing protocols, such as CCSDS Advanced Orbiting System (AOS), and higher-layer networking protocols, such as CFDP (CCSDS File Delivery...

Briefs: Electronics & Computers
Reconfigurable Robust Routing for Mobile Outreach Network

The Reconfigurable Robust Routing for Mobile Outreach Network (R3MOON) provides advanced communications networking technologies suitable for the lunar surface environment and applications. The R3MOON technology is based on a detailed concept of operations tailored for lunar surface...

Briefs: Software
Parachute Drag Model

DTV-SIM is a computer program that implements a mathematical model of the flight dynamics of a missile-shaped drop test vehicle (DTV) equipped with a multistage parachute system that includes two simultaneously deployed drogue parachutes and three main parachutes deployed subsequently and simultaneously by use of pilot...

Briefs: Software
Evolutionary Scheduler for the Deep Space Network

A computer program assists human schedulers in satisfying, to the maximum extent possible, competing demands from multiple spacecraft missions for utilization of the transmitting/receiving Earth stations of NASA’s Deep Space Network. The program embodies a concept of optimal scheduling to...

Articles: Electronics & Computers

The telecommunications industry’s continuous strive for higher performance has spurred innovations in processor architectures. The general trend has been to go parallel; adding more cores to a...

Application Briefs: Electronics & Computers

Satellite communications offer mobility and communications for military operations in remote locations where terrestrial-based connectivity is not available, or is too...

Briefs: Software
Particle Swarm Optimization Toolbox

The Particle Swarm Optimization Toolbox is a library of evolutionary optimization tools developed in the MAT-LAB environment. The algorithms contained in the library include a genetic algorithm (GA), a single-objective particle swarm optimizer (SOPSO), and a multi-objective particle swarm optimizer (MOPSO)....

Briefs: Software
Computer-Automated Evolution of Spacecraft X-Band Antennas

A document discusses the use of computer-aided evolution in arriving at a design for X-band communication antennas for NASA’s three Space Technology 5 (ST5) satellites, which were launched on March 22, 2006. Two evolutionary algorithms, incorporating different representations of the...

Briefs: Electronics & Computers

Previous microstrip-to-waveguide transitions either required a hermetically sealed waveguide configuration, or a balun that needed to be tuned according to the frequency band...

Briefs: Electronics & Computers
Thin-Film Ferroelectric-Coupled Microstripline Phase Shifters With Reduced Device Hysteresis

This work deals with the performance of coupled microstripline phase shifters (CMPS) fabricated using BaxSr1-xTiO3 (BST) ferroelectric thin films. The CMPS were fabricated using commercially available pulsed laser...

Briefs: Physical Sciences
Planar Submillimeter-Wave Mixer Technology With Integrated Antenna

High-performance mixers at terahertz frequencies require good matching between the coupling circuits such as antennas and local oscillators and the diode embedding impedance. With the availability of amplifiers at submillimeter wavelengths and the need to have multi-pixel imagers...

Briefs: Information Technology
Reactive Collision Avoidance Algorithm

The reactive collision avoidance (RCA) algorithm allows a spacecraft to find a fuel-optimal trajectory for avoiding an arbitrary number of colliding spacecraft in real time while accounting for acceleration limits. In addition to spacecraft, the technology can be used for vehicles that can accelerate in any...

Application Briefs: Lighting

A turbine manufacturer wanted to get more power out of hundreds of turbines that were originally built and installed in the 1950s. The basic idea was to use the original outer casing but...

Application Briefs: Photonics/Optics
Widely Tunable Mode-Hop-Free External-Cavity Quantum Cascade Laser

The external-cavity quantum cascade laser (EC-QCL) system is based on an optical configuration of the Littrow type. It is a room-temperature, continuous- wave, widely tunable, mode-hop-free, mid-infrared, EC-QCL spectroscopic source. It has a single-mode tuning range of 155...

Briefs: Photonics/Optics

Specially designed focusing of light beams has been proposed as a means of improving the performances of optical buffers based on cells containing hot atomic vapors (e.g., rubidium...

Articles: Communications

Communications engineers today must design to accommodate changing missions, shorter product lifecycles, and increasing computer power. As a result, they create hybrid systems that include...

Briefs: Manufacturing & Prototyping
Adaptable Diffraction Gratings With Wavefront Transformation

Diffraction gratings are optical components with regular patterns of grooves, which angularly disperse incoming light by wavelength. Traditional diffraction gratings have static planar, concave, or convex surfaces. However, if they could be made so that they can change the surface...

Briefs: Software
Trajectory Optimization: OTIS 4

The latest release of the Optimal Trajectories by Implicit Simulation (OTIS4) allows users to simulate and optimize aerospace vehicle trajectories. With OTIS4, one can seamlessly generate optimal trajectories and parametric vehicle designs simultaneously. New features also allow OTIS4 to solve non-aerospace...

Briefs: Materials

A systematic experimental study has been performed to determine the effects of each of the operating conditions in a double-pulse laser ablation process that is used to produce...

Briefs: Information Technology

Some non-traditional signal constellations have been proposed for transmission of data over the Additive White Gaussian Noise (AWGN) channel using such channel-capacity-approaching codes as low-density...

Briefs: Photonics/Optics

Specially designed focusing of light beams has been proposed as a means of improving the performances of optical buffers based on cells containing hot atomic vapors (e.g., rubidium...