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1

Computer-Generated Holography as a Generic Display Technology  

Microsoft Academic Search

Computer-generated holography is a powerful technology suitable for a wide range of display types, including 2D, stereoscopic, autostereoscopic, volumetric, and true 3D imaging. Although CGH-based display systems are currently too expensive for many applications, they will become a viable alternative in the near future.

Chris Slinger; Colin Cameron; Maurice Stanley

2005-01-01

2

Special-purpose computer for holography HORN3 with PLD technology  

Microsoft Academic Search

We have designed and built a special-purpose computer for holography, HORN-3 (HOlographic ReconstructioN) using PLD (Programmable Logic Device) technology.We could integrate a pipeline to calculate hologram into one PLD chip, so that we can readily parallelize the system. By mounting two of the PLD chips on a PCI (Peripheral Component Interconnect) universal board, HORN-3 calculates light intensity at high speed

Tomoyoshi Shimobaba; Nobuyuki Masuda; Takashige Sugie; Satoru Hosono; Shinobu Tsukui; Tomoyoshi Ito

2000-01-01

3

Limits of computational white-light holography  

NASA Astrophysics Data System (ADS)

Recently, computational holograms are being used in applications, where previously conventional holograms were applied. Compared to conventional holography, computational holography is based on imaging of virtual objects instead of real objects, which renders them somewhat more flexibility. Here, computational holograms are calculated based on the superposition of point sources, which are placed at the mesh vertices of arbitrary 3D models. The computed holograms have full parallax and exhibit a problem in viewing that we have called "ghosting", which is linked to the viewing of computational holograms based on 3D models close to the image plane. Experimental white-light reconstruction of these holograms showed significant blurring, which is explained here based on simulations of the lateral as well as the axial resolution of a point image with respect to the source spectrum and image distance. In accordance with these simulations, an upper limit of the distance to the image plane is determined, which ensures high quality imaging.

Mader, Sebastian; Kozacki, Tomasz; Tompkin, Wayne

2013-02-01

4

Video-rate computational heterodyne holography.  

PubMed

We present a versatile computational image rendering software of optically acquired holograms. The reported software can process 4 Megapixel 8-bit raw frames from a sensor array acquired at a sustained rate of 80 Hz. Video-rate image rendering is achieved by streamline image processing with commercial computer graphics hardware. For time-averaged holograms acquired in off-axis optical configuration with a frequency-shifted reference beam, wide-field imaging of one tunable spectral component is permitted. This software is validated by phase-stepped hologram rendering, and noncontact monitoring of surface acoustic waves by single and dual sideband hologram rendering. It demonstrates the suitability of holography for video-rate computational laser Doppler imaging in a heterodyne optical configuration. PMID:24686682

Dillée, Antoine; Cancilliere, Romain; Lopes, Fernando; Atlan, Michael

2014-04-01

5

Video-rate computational heterodyne holography  

NASA Astrophysics Data System (ADS)

We present a versatile computational image rendering software of optically-acquired holograms. The reported software can process 4 Megapixel 8-bit raw frames from a sensor array acquired at a sustained rate of 80 Hz. Video-rate image rendering is achieved by streamline image processing with commodity computer graphics hardware. For time-averaged holograms acquired in off-axis optical configuration with a frequency-shifted reference beam, wide-field imaging of one tunable spectral component is permitted. This software is validated by phase-stepped hologram rendering, and non-contact monitoring of surface acoustic waves by single and dual sideband hologram rendering. It demonstrates the suitability of holography for video-rate computational laser Doppler imaging in heterodyne optical configuration.

Dillée, Antoine; Cancilliere, Romain; Lopes, Fernando; Atlan, Michael

2014-04-01

6

Numerical techniques for Fresnel diffraction in computational holography  

Microsoft Academic Search

Optical holography can produce very realistic virtual images due to its capability to properly convey the depth cues that we use to interpret three-dimensional objects. Computational holography is the use of digital representations plus computational methods to carry out the holographic operations of construction and reconstruction. The large computational requirements of holographic simulations prohibit present-day existence of real-time holographic displays

Richard Patrick Muffoletto

2006-01-01

7

Holography.  

ERIC Educational Resources Information Center

Holography is a process which numbers among its many applications the creation of holograms--unique three dimensional photographs that show spatial relations and shifts just as they exist in reality. This book recounts the history of holography, tracing its development from Euclid's theory of light rays through Huygens' theory of wave motion to…

Klein, H. Arthur

8

Computer generated holography as a three-dimensional display medium  

Microsoft Academic Search

A process was developed to produce three dimensional images using computer generated holography (CGH). This process consisted of a series of steps that began with a geometric description of an object and concluded with a three dimensional holographic image being computed from a synthetic wavefront. The objects used in this series of steps (or CGH pipeline) were described geometrically as

Bryant L. Stuart

1990-01-01

9

Computational methods in Nearfield Acoustic Holography (NAH), appendix  

Microsoft Academic Search

The continuous integrals and integral equations which form the theory of Nearfield Acoustic Holography for planar and odd-shaped source boundary surfaces are reviewed, and the approximations and assumptions necessary to reduce these equations to a set of finite and discrete operations suitable for computation are developed. These equations represent the solution of the Helmholtz equation with specified boundary conditions by

W. A. Veronesi

1986-01-01

10

Nonclassical dichromated gelatin technologies for holography  

Microsoft Academic Search

Dichromated gelatin (DG) is widely used in holography with traditional water developing technique, but it is possible to use one as the real time recording media under the hot vapor developing as well as the self developing DG-modification. The absence of postexposure processing allows to use it for in-situ experiments. The recorded hologram is the result of conformational changes in

Alexander N. Malov; Nadya Reinhand; Yury N. Vigovsky; Yulia Zagainova; Sergey N. Malov; Igor V. Bogdan; Irina V. Semenova; Vladimir Molocilo; Alexi Petrov

2003-01-01

11

Advanced technology development multi-color holography  

NASA Technical Reports Server (NTRS)

This is the final report of the Multi-color Holography project. The comprehensive study considers some strategic aspects of multi-color holography. First, various methods of available techniques for accurate fringe counting are reviewed. These are heterodyne interferometry, quasi-heterodyne interferometry, and phase-shifting interferometry. Phase-shifting interferometry was found to be the most suitable for multi-color holography. Details of experimentation with a sugar solution are also reported where better than 1/200 of a fringe order measurement capability was established. Rotating plate glass phase shifter was used for the experimentation. The report then describes the possible role of using more than two wavelengths with special reference-to-object beam intensity ratio needs in multicolor holography. Some specific two- and three-color cases are also described in detail. Then some new analysis methods of the reconstructed wavefront are considered. These are deflectometry, speckle metrology, confocal optical signal processing, and phase shifting technique related applications. Finally, design aspects of an experimental breadboard are presented.

Vikram, Chandra S.

1993-01-01

12

Color evaluation of computer-generated color rainbow holography  

NASA Astrophysics Data System (ADS)

A color evaluation approach for computer-generated color rainbow holography (CGCRH) is presented. Firstly, the relationship between color quantities of a computer display and a color computer-generated holography (CCGH) colorimetric system is discussed based on color matching theory. An isochromatic transfer relationship of color quantity and amplitude of object light field is proposed. Secondly, the color reproduction mechanism and factors leading to the color difference between the color object and the holographic image that is reconstructed by CGCRH are analyzed in detail. A quantitative color calculation method for the holographic image reconstructed by CGCRH is given. Finally, general color samples are selected as numerical calculation test targets and the color differences between holographic images and test targets are calculated based on our proposed method.

Shi, Yile; Wang, Hui; Wu, Qiong

2013-02-01

13

Nonclassical dichromated gelatin technologies for holography  

NASA Astrophysics Data System (ADS)

Dichromated gelatin (DG) is widely used in holography with traditional water developing technique, but it is possible to use one as the real time recording media under the hot vapor developing as well as the self developing DG-modification. The absence of postexposure processing allows to use it for in-situ experiments. The recorded hologram is the result of conformational changes in the structure of a gelatin system. It is the result of hierarchy of sequential structural gelatin marcomolecules modifications. Characteristics of these processes can be effectively controlled at the levels of the primary (the chemical composition of emulsion) and ternary (coil-globule transitions for the entire macromolecule) structures of the SD DG system. We analyzed the influence of IR laser annealing and/or special highly hardened gelatin sublayer on the gelatination acceleration and resulting diffraction efficiency of layers with thickness more than 1 mm. The properties of non-classical new version of DG systems are discussed.

Malov, Alexander N.; Reinhand, Nadya; Vigovsky, Yury N.; Zagainova, Yulia; Malov, Sergey N.; Bogdan, Igor V.; Semenova, Irina V.; Molocilo, Vladimir; Petrov, Alexi

2003-06-01

14

Complementary computer generated holography for aesthetic watermarking.  

PubMed

We present herein an original solution for the watermarking of holograms in binary graphic arts without unaesthetic diffractive effect. It is based on the Babinet principle of complementary diffractive structures adapted to Lohmann-type computer generated holograms. We introduce the concept and demonstrate its interest for anti-counterfeiting applications with the decoding of a hidden data matrix. A process of thermal lithography is used for the manufacturing of binary graphic arts containing complementary computer generated holograms. PMID:22418361

Martinez, Christophe; Lemonnier, Olivier; Laulagnet, Fabien; Fargeix, Alain; Tissot, Florent; Armand, Marie Françoise

2012-02-27

15

Monte Carlo method in computer holography  

Microsoft Academic Search

A method based on the Monte Carlo procedure is suggested to simulate the reconstruction of non-Fourier-type computer- generated holograms (CGHs). The cases of amplitude holograms (CGAHs) and phase holograms (CGPHs), or `kinoform lenses,' are investigated. A method to model the finite pixel size of the hologram is suggested. An importance sampling method is proposed to simulate the reconstruction of CGAHs.

Nandor Bokor; Zsolt Papp

1997-01-01

16

Computer Technology  

NSDL National Science Digital Library

Students will learn the history of computers as well as how computers work. COMPUTER TECHNOLOGY (9-12) - 52.0417 Computer Technology is an introduction to computer application software that includes word processing, spreadsheet, database, and telecommunications. An awareness of career opportunities, business ethics, and trends is included. Everything is done with computers. Your job will most likely have a computer to save files, write ...

Thackeray, Mrs.

2007-10-14

17

EDITORIAL: Optical tomography and digital holography  

Microsoft Academic Search

The articles in this special feature in Measurement Science and Technology concern exciting new developments in the field of digital holography---the process of electronically recording and numerically reconstructing an optical field [1]. Making use of the enormous advances in digital imaging and computer technology, digital holography is presented in a range of applications from fluid flow measurement and structural analysis

Jeremy Coupland; Julia Lobera

2008-01-01

18

Computational Methods in Nearfield Acoustic Holography (NAH). Appendix.  

National Technical Information Service (NTIS)

The continuous integrals and integral equations which form the theory of Nearfield Acoustic Holography for planar and odd-shaped source boundary surfaces are reviewed, and the approximations and assumptions necessary to reduce these equations to a set of ...

W. A. Veronesi

1986-01-01

19

Computational spectral microscopy and compressive millimeter-wave holography  

NASA Astrophysics Data System (ADS)

This dissertation describes three computational sensors. The first sensor is a scanning multi-spectral aperture-coded microscope containing a coded aperture spectrometer that is vertically scanned through a microscope intermediate image plane. The spectrometer aperture-code spatially encodes the object spectral data and nonnegative least squares inversion combined with a series of reconfigured two-dimensional (2D spatial-spectral) scanned measurements enables three-dimensional (3D) (x, y, lambda) object estimation. The second sensor is a coded aperture snapshot spectral imager that employs a compressive optical architecture to record a spectrally filtered projection of a 3D object data cube onto a 2D detector array. Two nonlinear and adapted TV-minimization schemes are presented for 3D (x, y, lambda) object estimation from a 2D compressed snapshot. Both sensors are interfaced to laboratory-grade microscopes and applied to fluorescence microscopy. The third sensor is a millimeter-wave holographic imaging system that is used to study the impact of 2D compressive measurement on 3D (x, y, z) data estimation. Holography is a natural compressive encoder since a 3D parabolic slice of the object band volume is recorded onto a 2D planar surface. An adapted nonlinear TV-minimization algorithm is used for 3D tomographic estimation from a 2D and a sparse 2D hologram composite. This strategy aims to reduce scan time costs associated with millimeter-wave image acquisition using a single pixel receiver.

Fernandez, Christy Ann

20

A high performance computing algorithm to improve in-line holography  

Microsoft Academic Search

A holographic algorithm is suggested to reduce the computing time by orders of magnitude in computer generation and reconstruction of holograms, that is called HPCHolo (High Performance Computing Holography). It is proposed to speed up the generation of holograms by a ray-tracing technique and the reconstruction of a virtual image from that hologram by a correlation technique. We applied the

Hesham Eldeib

1999-01-01

21

Compressive Holography  

NASA Astrophysics Data System (ADS)

Compressive holography estimates images from incomplete data by using sparsity priors. Compressive holography combines digital holography and compressive sensing. Digital holography consists of computational image estimation from data captured by an electronic focal plane array. Compressive sensing enables accurate data reconstruction by prior knowledge on desired signal. Computational and optical co-design optimally supports compressive holography in the joint computational and optical domain. This dissertation explores two examples of compressive holography: estimation of 3D tomographic images from 2D data and estimation of images from under sampled apertures. Compressive holography achieves single shot holographic tomography using decompressive inference. In general, 3D image reconstruction suffers from underdetermined measurements with a 2D detector. Specifically, single shot holographic tomography shows the uniqueness problem in the axial direction because the inversion is ill-posed. Compressive sensing alleviates the ill-posed problem by enforcing some sparsity constraints. Holographic tomography is applied for video-rate microscopic imaging and diffuse object imaging. In diffuse object imaging, sparsity priors are not valid in coherent image basis due to speckle. So incoherent image estimation is designed to hold the sparsity in incoherent image basis by support of multiple speckle realizations. High pixel count holography achieves high resolution and wide field-of-view imaging. Coherent aperture synthesis can be one method to increase the aperture size of a detector. Scanning-based synthetic aperture confronts a multivariable global optimization problem due to time-space measurement errors. A hierarchical estimation strategy divides the global problem into multiple local problems with support of computational and optical co-design. Compressive sparse aperture holography can be another method. Compressive sparse sampling collects most of significant field information with a small fill factor because object scattered fields are locally redundant. Incoherent image estimation is adopted for the expanded modulation transfer function and compressive reconstruction.

Lim, Se Hoon

22

Acoustical Holography Technology for Surface Noise Sources Location on Underwater Cylindrical Shell Structure  

Microsoft Academic Search

Cylindrical Multi-reference Statistically Optimized Near-field Acoustical Holography technology is proposed to apply to surface noise sources locating on underwater cylindrical shell structure. Implementing process of the proposed noise sources locating technology, is compose of arranging reference points for the aimed system, carrying out partial sound field decomposition, reconstructing partial sound field on reconstruction surface and assembling composite vector of sound

Guang-fu Cheng; Bin Xiao; San-de Wang; Wen-shuai Liu

2010-01-01

23

Visualization in medicine: multidimensional object presentation methods for computer displays and volume holography  

Microsoft Academic Search

This paper presents and analyzes issues relating to visualization of medical data, with particular attention to “object-oriented” methods, computer rendering, and volume holography display. Topics discussed include information extraction, object definition, data form, perception, time multiplexing, and actual reality versus virtual reality

Justin D. Pearlman

1995-01-01

24

Gray tone image watermarking with complementary computer generated holography.  

PubMed

We present herein an original approach for the watermarking of holograms in gray tone images for use in microscopic halftone image archiving. Our concept is based on the principle of complementary holography presented in a previous contribution. The efficiency of the concept is evaluated theoretically and experimentally. We demonstrate the interest of elliptical diffraction patterns as an alternative to the usual rectangular diffraction patterns and confirm the subsidiary role of the hologram amplitude in the hologram recovery process. PMID:23842332

Martinez, Christophe; Laulagnet, Fabien; Lemonnier, Olivier

2013-07-01

25

Holography: A survey  

NASA Technical Reports Server (NTRS)

The development of holography and the state of the art in recording and displaying information, microscopy, motion, pictures, and television applications are discussed. In addition to optical holography, information is presented on microwave, acoustic, ultrasonic, and seismic holography. Other subjects include data processing, data storage, pattern recognition, and computer-generated holography. Diagrams of holographic installations are provided. Photographs of typical holographic applications are used to support the theoretical aspects.

Dudley, D. D.

1973-01-01

26

Nontraditional dichromated gelatin recording media synthesis technologies for holography  

NASA Astrophysics Data System (ADS)

Dichromated gelatin (DG) is widely used in holography with traditional water developing technique, but it is possible to use one as the real time recording media under the hot vapor developing as well as the self-developing DG-modification. The absence of post-exposure processing allows to use it for in-situ experiments. The recorded holgoram is the result of conformational changes in the structure of a gelatin system. It is the result of hierarchy of sequential structural gelatin macromolecules modifications. Characteristics of these processes can be effectively controlled at the levels of the primary (the chemical composition of emulsion) and ternary (coil-globule transitions for the entire macromolecule) structures of the SD DG system. We analyzed the influence of IR laser annealing and/or special highly hardened gelatin sublayer on the gelatination acceleration and resulting diffraction efficiency of layers with thickness more than 1 mm. The properties of non-classical new version of DG systems are discussed.

Malov, Alexander N.; Reinhand, Nadya O.; Vigovsky, Yury N.; Bogdan, Igor V.; Molocilo, Yu. V.; Petrov, Alexei A.

2003-09-01

27

Digital holography: 30 years later  

Microsoft Academic Search

Digital holography is analysis, synthesis and simulation of wave fields by means of digital computers and processors. Since first publications in digital holography, more than 30 years have passed. From then on, the ideas of digital holography formulated at that time has found quite a number of applications and implementations; but not all of them. Some old dreams such as

Leonid P. Yaroslavsky

2002-01-01

28

Applications of digital holography to measurements and optical characterization  

NASA Astrophysics Data System (ADS)

With recent advances in high-speed computer and video capture technology, holographic films used in classical holography can be replaced with charged-coupled devices (CCD) and complementary metal-oxide-semiconductor (CMOS) image sensors to record and numerically reconstruct a hologram, which is now known as digital holography. Digital holography introduces something new to optical science. Wet chemical processing and other time-consuming procedures can be removed, so numerical recording and reconstruction can be realized in almost real time. It allows us to characterize the phase of a light field as well the intensity, and so the whole wave field can be measured and stored in a computer. Digital holography is expanding applications of holography and becoming a scientific and technological tool. Its use has now increased for measuring amplitude and the phase of object waves, displacement and three dimensional shape, particle distributions and motions, characterization of the refractive index and biological tissues, and vibration analysis, etc. Here, basic principles of digital holography for optical measurement and characterization are described. Taking into consideration the rapid advance in CCD and CMOS sensors as the background, the state-of-the-art applications of digital holography to optical measurement and characterization are presented.

Sang, Xinzhu; Yu, Chongxiu; Yu, Miao; Hsu, Dashsiung

2011-09-01

29

OPTIMIZING COMPUTER TECHNOLOGY INTEGRATION  

Microsoft Academic Search

The purpose of this study was to better utiderstatid what optimal computer techtiol- ogy ititegration looks like in adult basic skills education (ABSE). One question guided the research: How is computer technology integration best conceptualized and measured? The study used the Delphi method to map the cotistruct of computer technology integratioti and required qualitative analysis of expert opinion, gathered in

Elizabeth Dillon-Marable; Thomas Valentine

2006-01-01

30

The fast scheme for mixed-3D scenes by polygon-based computer-generated holography (CGH)  

NASA Astrophysics Data System (ADS)

We proposed a fast scheme for computer-generated holography (CGH) to mix 3D scenes. The objects in the proposed include the real and virtual objects. Make a point cloud model of real object, and then converted to a triangular mesh model. And mix the triangular mesh model with virtual 3D object mesh models. Using the angular spectrum method to generated hologram, and it is convenient to accelerating with GPU.

Piao, Yan-Ling; Le, Thanh B.; Li, Weina; Jeong, Jong-Rea; Kim, Nam

2014-02-01

31

Advanced holography in high school  

NASA Astrophysics Data System (ADS)

Teaching advanced holography to secondary students is tremendously rewarding, and at the same time presents many challenges. IN this paper, we describe our experiences teaching an advanced holography course as part of the Photonics Program at the Columbia Area Career Center in Columbia, Missouri. We also discuss how training in holography- using both simple and advanced techniques and equipment- prepares students for a variety of vocations involving laser technology.

John, Pearl V.

2000-10-01

32

Computer Technology for Industry  

NASA Technical Reports Server (NTRS)

In this age of the computer, more and more business firms are automating their operations for increased efficiency in a great variety of jobs, from simple accounting to managing inventories, from precise machining to analyzing complex structures. In the interest of national productivity, NASA is providing assistance both to longtime computer users and newcomers to automated operations. Through a special technology utilization service, NASA saves industry time and money by making available already developed computer programs which have secondary utility. A computer program is essentially a set of instructions which tells the computer how to produce desired information or effect by drawing upon its stored input. Developing a new program from scratch can be costly and time-consuming. Very often, however, a program developed for one purpose can readily be adapted to a totally different application. To help industry take advantage of existing computer technology, NASA operates the Computer Software Management and Information Center (COSMIC)(registered TradeMark),located at the University of Georgia. COSMIC maintains a large library of computer programs developed for NASA, the Department of Defense, the Department of Energy and other technology-generating agencies of the government. The Center gets a continual flow of software packages, screens them for adaptability to private sector usage, stores them and informs potential customers of their availability.

1979-01-01

33

Computer Science and Technology Publications.  

National Technical Information Service (NTIS)

This bibliography lists publications of the Institute for Computer Sciences and Technology of the National Bureau of Standards. Publications are listed by subject in the areas of computer security, computer networking, and automation technology. Sections ...

1977-01-01

34

Industrial applications of holography  

Microsoft Academic Search

Topics presented include the holographic basis for intelligent machines, holographic stereograms of computer-generated objects made using a liquid crystal spatial modulator, the principles and applications of electronic speckle pattern interferometer, and high-temperature optical strain measurement. Also presented are the application of holography to underwater visual inspection, dry polymer for holographic recording, variable index materials for optical data processing, and holographic

Jean Robillard; H. J. Caulfield

1990-01-01

35

Computer Technology in Adult Education.  

ERIC Educational Resources Information Center

This publication provides materials to help adult educators use computer technology in their teaching. Section 1, Computer Basics, contains activities and materials on these topics: increasing computer literacy, computer glossary, parts of a computer, keyboard, disk care, highlighting text, scrolling and wrap-around text, setting up text,…

Slider, Patty; Hodges, Kathy; Carter, Cea; White, Barbara

36

Computer Technology: Bridging the Gap.  

ERIC Educational Resources Information Center

The role of computer technology in China is examined in this paper, with a focus on the current status of school administration, educational technology, educational television, and computer education. A review of current research indicates that computer use in Chinese schools is sparse and haphazard. The recommendation is made that the USA/China…

Richardson, M. D.; And Others

37

Review of Computer Networking Technology.  

National Technical Information Service (NTIS)

The report gives a descriptive summary of the technical characteristics of existing computer networks, including data communication technology and configuration related to support of resource sharing services for a computer network. Included are discussio...

R. P. Blanc

1974-01-01

38

Computer Technology and Nursing Education.  

ERIC Educational Resources Information Center

The influences of computer technology on college nursing education programs and health care delivery systems are discussed in eight papers. The use of computers is considered, with attention to clinical care, nursing education and continuing education, administration, and research. Attention is also directed to basic computer terminology, computer

Southern Council on Collegiate Education for Nursing, Atlanta, GA.

39

Holography techniques and applications  

SciTech Connect

This book contains papers presented at a conference on holography techniques and applications. The topics covered include: holography with a frequency-doubled Nd:YAG laser; multiplex holograms from scanning electron microscope; and some applications of LCD in holography.

Not Available

1988-01-01

40

Computer Technology in Industry.  

National Technical Information Service (NTIS)

Contents: An automated work site for designers and technologists; Package of applied programs for organizing multipurpose-structure data banks for the unified computer system--the International Exhibition 'Interorgtekhnika-75,' Soviet Section; Package of ...

1975-01-01

41

Digitized holography: modern holography for 3D imaging of virtual and real objects.  

PubMed

Recent developments in computer algorithms, image sensors, and microfabrication technologies make it possible to digitize the whole process of classical holography. This technique, referred to as digitized holography, allows us to create fine spatial three-dimensional (3D) images composed of virtual and real objects. In the technique, the wave field of real objects is captured in a wide area and at very high resolution using the technique of synthetic aperture digital holography. The captured field is incorporated in virtual 3D scenes including two-dimensional digital images and 3D polygon mesh objects. The synthetic field is optically reconstructed using the technique of computer-generated holograms. The reconstructed 3D images present all depth cues like classical holograms but are digitally editable, archivable, and transmittable unlike classical holograms. The synthetic hologram printed by a laser lithography system has a wide viewing zone in full-parallax and give viewers a strong sensation of depth, which has never been achieved by conventional 3D systems. A real hologram as well as the details of the technique is presented to verify the proposed technique. PMID:22193018

Matsushima, Kyoji; Arima, Yasuaki; Nakahara, Sumio

2011-12-01

42

Information Technology: Computer Systems Engineer  

NSDL National Science Digital Library

Watch how a community college education took one person from being a computer know-nothing to having a career as a successful information technologist, in this video adapted from Pathways to Technology.

Foundation, Wgbh E.

2012-05-18

43

Trusted Computing Technologies, Intel Trusted Execution Technology  

Microsoft Academic Search

We describe the current state-of-the-art in Trusted Computing Technologies - focusing mainly on Intel's Trusted Execution Technology (TXT). This document is based on existing documentation and tests of two existing TXT-based systems: Intel's Trusted Boot and Invisible Things Lab's Qubes OS. We describe what features are lacking in current implementations, describe what a mature system could provide, and present a

Max Joseph Guise; Jeremy Daniel Wendt

2011-01-01

44

Computer Animation in Future Technologies  

Microsoft Academic Search

In this introductory chapter, we try to situate the role of Computer Animation in the new technologies: digital television, virtual reality, multimedia, cooperative work. We also overview the main techniques which will be further discussed throughout this book by international experts. 1 The high-tech role of computer animation The term \\

Nadia Magnenat Thalmann; Daniel Thalmann

1998-01-01

45

Dynamic display of 3D objects in real and virtual spaces with computer-generated holography  

Microsoft Academic Search

In this paper a new holographic 3D display system based on computer-generated hologram (CGH) is developed for the reconstruction of 3D objects. A new algorithm is also developed to reduce the hologram computation time and memory usage. The dynamic 3D objects are successfully reconstructed at video rates in both real and virtual spaces.

Xuewu Xu; Sanjeev Solanki; Xinan Liang; Shuhong Xu; Ridwan Bin Adrian Tanjung; Yuechao Pan; Farzam Farbiz; Baoxi Xu; Tow-chong Chong

2008-01-01

46

Helsinki University of Technology: Computational Information Technology  

NSDL National Science Digital Library

Computational Information Technology is a research group of the Laboratory of Computational Engineering at the Helsinki University of Technology in Finland. This section of the website introduces visitors to the group's work on modelling and analyzing complex physical, technical and economic processes and systems. Researchers "carry out method development and application oriented research on advanced probabilistic and information theoretic methods." Some applications include statistical modelling of financial markets, pattern recognition in neural networks, machine vision for microscope image processing, data mining, and intelligent human-machine interfaces. The Research Projects section describes the group's work in these areas and highlights the mathematical and statistical methods used, such as Bayesian methods, vision geometry, Turing's reaction-diffusion systems, and time-frequency analysis. Each research area has its own website, where the overall project and theoretical framework is described along with images and diagrams. Publications, such as theses and journal articles are listed and some conference proceedings and articles are available to download.

47

Frequency analysis of digital holography  

Microsoft Academic Search

A coherent optical imaging system consisting of recording a digital hologram by a CCD array and numerical reconstruction of the complex wave field in a computer is subjected to a frequency analysis. This analysis recognizes Fresnel and lensless Fourier transform holography; collimated and divergent reference waves; as well as the real image, the virtual image, and the dc term. The

Thomas M. Kreis

2002-01-01

48

Captology: Computers as Persuasive Technologies  

NSDL National Science Digital Library

"The Stanford Persuasive Technology Lab creates insight into how computing products -- from websites to mobile phone software -- can be designed to change what people believe and what they do." This unusual field of study is called captology, and the subject is explored in detail on the lab's homepage. The Key Concepts section provides a brief overview of captology and links to another page with nine topic papers published by researchers at the lab. In a series of examples demonstrating how computers can be used to influence a person, the site's creators separate instances into macrosuasion and microsuasion. Specific websites and computer programs are highlighted to reveal these interesting marketing or motivational tactics.

49

Holography Machine HORN1 for Computer-Aided Retrieval of Virtual Three-Dimensional Image  

Microsoft Academic Search

We propose a method to efficiently retrieve the original 3-D (three-dimensional) objects by computers as a virtual image from a hologram. The present method is based on the correlation between the hologram of a point source and the hologram of objects. We have succeeded in the retrieval of objects with the wavelength resolution in any direction. This resolution is not

Takashi Yabe; Tomoyoshi Ito; Masashi Okazaki

1993-01-01

50

Computer Technology. Career Education Guide.  

ERIC Educational Resources Information Center

The curriculum guide is designed to provide students with realistic training in computer technology theory and practice within the secondary educational framework and to prepare them for entry into an occupation or continuing postsecondary education. Each unit plan consists of a description of the area under consideration, estimated hours of…

Dependents Schools (DOD), Washington, DC. European Area.

51

Electro-holography display using computer generated hologram of 3D objects based on projection spectra  

NASA Astrophysics Data System (ADS)

A new method of synthesizing computer-generated hologram of three-dimensional (3D) objects is proposed from their projection images. A series of projection images of 3D objects are recorded with one-dimensional azimuth scanning. According to the principles of paraboloid of revolution in 3D Fourier space and 3D central slice theorem, spectra information of 3D objects can be gathered from their projection images. Considering quantization error of horizontal and vertical directions, the spectrum information from each projection image is efficiently extracted in double circle and four circles shape, to enhance the utilization of projection spectra. Then spectra information of 3D objects from all projection images is encoded into computer-generated hologram based on Fourier transform using conjugate-symmetric extension. The hologram includes 3D information of objects. Experimental results for numerical reconstruction of the CGH at different distance validate the proposed methods and show its good performance. Electro-holographic reconstruction can be realized by using an electronic addressing reflective liquid-crystal display (LCD) spatial light modulator. The CGH from the computer is loaded onto the LCD. By illuminating a reference light from a laser source to the LCD, the amplitude and phase information included in the CGH will be reconstructed due to the diffraction of the light modulated by the LCD.

Huang, Sujuan; Wang, Duocheng; He, Chao

2012-11-01

52

Optical Computers and Space Technology  

NASA Technical Reports Server (NTRS)

The rapidly increasing demand for greater speed and efficiency on the information superhighway requires significant improvements over conventional electronic logic circuits. Optical interconnections and optical integrated circuits are strong candidates to provide the way out of the extreme limitations imposed on the growth of speed and complexity of nowadays computations by the conventional electronic logic circuits. The new optical technology has increased the demand for high quality optical materials. NASA's recent involvement in processing optical materials in space has demonstrated that a new and unique class of high quality optical materials are processible in a microgravity environment. Microgravity processing can induce improved orders in these materials and could have a significant impact on the development of optical computers. We will discuss NASA's role in processing these materials and report on some of the associated nonlinear optical properties which are quite useful for optical computers technology.

Abdeldayem, Hossin A.; Frazier, Donald O.; Penn, Benjamin; Paley, Mark S.; Witherow, William K.; Banks, Curtis; Hicks, Rosilen; Shields, Angela

1995-01-01

53

Single Beam Holography.  

ERIC Educational Resources Information Center

Discusses how holography can be used as part of undergraduate physics laboratories. The authors propose a single beam technique of holography, which will reduce the recording scheme as well as relax the isolation requirements. (HM)

Chen, Hsuan; Ruterbusch, Paul H.

1979-01-01

54

Center for Advanced Computational Technology  

NASA Technical Reports Server (NTRS)

The Center for Advanced Computational Technology (ACT) was established to serve as a focal point for diverse research activities pertaining to application of advanced computational technology to future aerospace systems. These activities include the use of numerical simulations, artificial intelligence methods, multimedia and synthetic environments, and computational intelligence, in the modeling, analysis, sensitivity studies, optimization, design and operation of future aerospace systems. The Center is located at NASA Langley and is an integral part of the School of Engineering and Applied Science of the University of Virginia. The Center has four specific objectives: 1) conduct innovative research on applications of advanced computational technology to aerospace systems; 2) act as pathfinder by demonstrating to the research community what can be done (high-potential, high-risk research); 3) help in identifying future directions of research in support of the aeronautical and space missions of the twenty-first century; and 4) help in the rapid transfer of research results to industry and in broadening awareness among researchers and engineers of the state-of-the-art in applications of advanced computational technology to the analysis, design prototyping and operations of aerospace and other high-performance engineering systems. In addition to research, Center activities include helping in the planning and coordination of the activities of a multi-center team of NASA and JPL researchers who are developing an intelligent synthesis environment for future aerospace systems; organizing workshops and national symposia; as well as writing state-of-the-art monographs and NASA special publications on timely topics.

Noor, Ahmed K.

2000-01-01

55

Emerging holography  

SciTech Connect

We rederive AdS/CFT predictions for infrared two-point functions by an entirely four-dimensional approach, without reference to holography. This approach, originally due to Migdal in the context of QCD, utilizes an extrapolation from the ultraviolet to the infrared using a Pade approximation of the two-point function. We show that the Pade approximation and AdS/CFT give the same leading order predictions, and we discuss including power corrections such as those due to condensates of gluons and quarks in QCD. At finite order the Pade approximation provides a gauge invariant regularization of a higher dimensional gauge theory in the spirit of deconstructed extra dimensions. The radial direction of anti-de Sitter space emerges naturally in this approach.

Erlich, Joshua [Department of Physics, College of William and Mary, Williamsburg, Virginia 23187 (United States); Kribs, Graham D. [Department of Physics and Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403 (United States); Low, Ian [School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540 (United States)

2006-05-01

56

Phase-shift coherence holography.  

PubMed

We propose and experimentally demonstrate a new reconstruction scheme for coherence holography using computer-generated phase-shift coherence holograms. A 3D object encoded into the spatial coherence function is reconstructed directly from a set of incoherently illuminated computer-generated holograms with numerically introduced phase shifts. Although a rotating ground glass is used to introduce spatially incoherent illumination, the phase-shifting portion of the system is simple and free from mechanically moving components. PMID:20479864

Naik, Dinesh N; Ezawa, Takahiro; Miyamoto, Yoko; Takeda, Mitsuo

2010-05-15

57

Infinite possibilities: Computational structures technology  

NASA Technical Reports Server (NTRS)

Computational Fluid Dynamics (or CFD) methods are very familiar to the research community. Even the general public has had some exposure to CFD images, primarily through the news media. However, very little attention has been paid to CST--Computational Structures Technology. Yet, no important design can be completed without it. During the first half of this century, researchers only dreamed of designing and building structures on a computer. Today their dreams have become practical realities as computational methods are used in all phases of design, fabrication and testing of engineering systems. Increasingly complex structures can now be built in even shorter periods of time. Over the past four decades, computer technology has been developing, and early finite element methods have grown from small in-house programs to numerous commercial software programs. When coupled with advanced computing systems, they help engineers make dramatic leaps in designing and testing concepts. The goals of CST include: predicting how a structure will behave under actual operating conditions; designing and complementing other experiments conducted on a structure; investigating microstructural damage or chaotic, unpredictable behavior; helping material developers in improving material systems; and being a useful tool in design systems optimization and sensitivity techniques. Applying CST to a structure problem requires five steps: (1) observe the specific problem; (2) develop a computational model for numerical simulation; (3) develop and assemble software and hardware for running the codes; (4) post-process and interpret the results; and (5) use the model to analyze and design the actual structure. Researchers in both industry and academia continue to make significant contributions to advance this technology with improvements in software, collaborative computing environments and supercomputing systems. As these environments and systems evolve, computational structures technology will evolve. By using CST in the design and operation of future structures systems, engineers will have a better understanding of how a system responds and lasts, more cost-effective methods of designing and testing models, and improved productivity. For informational and educational purposes, a videotape is being produced using both static and dynamic images from research institutions, software and hardware companies, private individuals, and historical photographs and drawings. The extensive number of CST resources indicates its widespread use. Applications run the gamut from simpler university-simulated problems to those requiring solutions on supercomputers. In some cases, an image or an animation will be mapped onto the actual structure to show the relevance of the computer model to the structure. Transferring the digital files to videotape presents a number of problems related to maintaining the quality of the original image, while still producing a broadcast quality videotape. Since researchers normally do not create a computer image using traditional composition theories or video production requirements, often the image loses some of its original digital quality and impact when transferred to videotape. Although many CST images are currently available, those that are edited into the final project must meet two important criteria: they must complement the narration, and they must be broadcast quality when recorded on videotape.

Beam, Sherilee F.

1994-01-01

58

Computer Access. Tech Use Guide: Using Computer Technology.  

ERIC Educational Resources Information Center

One of nine brief guides for special educators on using computer technology, this guide focuses on access including adaptations in input devices, output devices, and computer interfaces. Low technology devices include "no-technology" devices (usually modifications to existing devices), simple switches, and multiple switches. High technology input…

Council for Exceptional Children, Reston, VA. Center for Special Education Technology.

59

Testing Helioseismic Holography  

NASA Astrophysics Data System (ADS)

The recent advent of "helioseismic holography" or "acoustic imaging" as it has sometimes been called, has provided a rich new set of techiniques and phenomena to aid local helioseismology. Through the application of these techniques to SOHO-MDI observations, strange new signatures - the "acoustic moat" and "acoustic glories" - have been documented but difficult to understand (Braun et al. 1998). In addition, by comparing the depth diagnostics between observations and simulations of an active region introducing random noise to a solar atmosphere through the ray approximation, it has been suggested that the refraction or absortion of p-modes in sunspots is primarily superficial. The purpose of this study is to better understand helioseismic holography through more testing. More specifically we propose a normal mode approach to generating artificial datasets. By solving the wave equation on the sphere with a sound speed perturbation resembling an active region, and summing the perturbed eigenfunctions in fourier space with the corresponding eigenfrequencies, we hope to construct an artificial dataset that more closely resembles the real thing. Although thousands of solar p-modes need to be considered, as well as millions (or more) of points in the resulting artificial dataset to be used, we aspire to make this possibly computationally expensive venture practical. With this method we hope to better test the depth, frequency, and pupil size diagnostics of acoustic images. This research is supported by NASA grant NAG5-3077 at Stanford University.

MacBeth, Jamie

60

Gravitational Holography  

NASA Astrophysics Data System (ADS)

The asymptotic number of states in an appropriately defined region in any theory of quantum gravity which reduces to Einstein gravity at large distances is equal to one quarter of the area in Planck units. A non-redundant description therefore requires only a hologram at the boundary of the region. The holographic properties of the states in quantum gravity lead to a mixing of the usual concepts of ultraviolet and infrared. This mixing is at odds with various properties of local quantum field theory such as the Heisenberg uncertainty relation as well as the upper bound on the fixed angle inclusive cross section in very high energy collisions. The holographic properties of gravity also imply that quantum contributions to the vacuum energy are finite and parametrically at most of order the classical value from which the infrared curvature scale is determined. Gravitational holography therefore provides a technically natural solution to the cosmological constant problem which plaques any local quantum field theory description of gravity.

Thomas, Scott

2006-10-01

61

Computer technologies and institutional memory  

NASA Technical Reports Server (NTRS)

NASA programs for manned space flight are in their 27th year. Scientists and engineers who worked continuously on the development of aerospace technology during that period are approaching retirement. The resulting loss to the organization will be considerable. Although this problem is general to the NASA community, the problem was explored in terms of the institutional memory and technical expertise of a single individual in the Man-Systems division. The main domain of the expert was spacecraft lighting, which became the subject area for analysis in these studies. The report starts with an analysis of the cumulative expertise and institutional memory of technical employees of organizations such as NASA. A set of solutions to this problem are examined and found inadequate. Two solutions were investigated at length: hypertext and expert systems. Illustrative examples were provided of hypertext and expert system representation of spacecraft lighting. These computer technologies can be used to ameliorate the problem of the loss of invaluable personnel.

Bell, Christopher; Lachman, Roy

1989-01-01

62

Integrating computer technology in teacher education  

Microsoft Academic Search

The paper highlights some of the concerns among developing countries to introduce computer technology in teacher education and the nations' classrooms in particular. The arguments in favour hinge on improving quality of education through improvement in quality of teaching and learning processes through the use of computer technology. The paper discusses the use of computer technology in exploring the constructivist

P. Moorgawa

63

Computer Technology and Architecture: An Evolving Interaction  

Microsoft Academic Search

The interaction between computer architecture and IC technology is examined. To evaluate the attractiveness of particular technologies, computer designs are assessed primarily on the basis of performance and cost. The focus is mainly on CPU performance, both because it is easier to measure and because the impact of technology is most easily seen in the CPU. The technology trends discussed

John L. Hennessy; Norman P. Jouppi

1991-01-01

64

Research of Digital Watermarking Based on DWT and Holography Image  

Microsoft Academic Search

Focusing on the copyright protection of digital museum image, one new method of digital watermarking combined the technology of discrete wavelet transform and digital holography is proposed. The digital watermark image is firstly changed into the digital holography image, which is the watermarking. Then the watermarking is embedded into the host image through the algorithm of DWT. The key is

Xia Fei; Zhang Hao; Peng Daogang; Li Hui; Xu Longhu

2009-01-01

65

Computer Technology-infused Learning Enhancement  

Microsoft Academic Search

The purpose of the study was to determine students’ perception of instructional integration of computer technology to improve\\u000a learning. Two key questions were investigated in this study: (a) What is the students’ perception of faculty integration of\\u000a computer technology into classroom instruction? (b) To what extent does the students’ perception of faculty integration of\\u000a computer technology, students’ computer proficiency levels

Jared Keengwe; Longy O. Anyanwu

2007-01-01

66

Holography for Schrödinger backgrounds  

NASA Astrophysics Data System (ADS)

We discuss holography for Schrödinger solutions of both topologically massive gravity in three dimensions and massive vector theories in ( d + 1) dimensions. In both cases the dual field theory can be viewed as a d-dimensional conformal field theory (two dimensional in the case of TMG) deformed by certain operators that respect the Schrödinger symmetry. These operators are irrelevant from the viewpoint of the relativistic conformal group but they are exactly marginal with respect to the non-relativistic conformal group. The spectrum of linear fluctuations around the background solutions corresponds to operators that are labeled by their scaling dimension and the lightcone momentum k v . We set up the holographic dictionary and compute 2-point functions of these operators both holographically and in field theory using conformal perturbation theory and find agreement. The counterterms needed for holographic renormalization are non-local in the v lightcone direction.

Guica, Monica; Skenderis, Kostas; Taylor, Marika; van Rees, Balt C.

2011-02-01

67

Center for Computational Structures Technology  

NASA Technical Reports Server (NTRS)

The Center for Computational Structures Technology (CST) is intended to serve as a focal point for the diverse CST research activities. The CST activities include the use of numerical simulation and artificial intelligence methods in modeling, analysis, sensitivity studies, and optimization of flight-vehicle structures. The Center is located at NASA Langley and is an integral part of the School of Engineering and Applied Science of the University of Virginia. The key elements of the Center are: (1) conducting innovative research on advanced topics of CST; (2) acting as pathfinder by demonstrating to the research community what can be done (high-potential, high-risk research); (3) strong collaboration with NASA scientists and researchers from universities and other government laboratories; and (4) rapid dissemination of CST to industry, through integration of industrial personnel into the ongoing research efforts.

Noor, Ahmed K.; Perry, Ferman W.

1995-01-01

68

Gordon Research Conference on Holography and Optical Information Processing  

NASA Astrophysics Data System (ADS)

The 1991 Gordon Research Conference on Holography and Optical Information Processing was held on 17-21 June, 1991 at Plymouth State College in Plymouth, NH. The talks on Ultrafast Optical Logic Using Solitons and Optical Processing with Planar Optics pointed out the significant progress being made by various Bell Labs investigators on various aspects of optical computing. Professor Sing Lee from the University of California-San Diego gave an excellent overview of some engineering and performance Issues in optoelectronic computing. It is clear that the Soviets have made considerable progress on multi transducer acousto-optic spectrum analyzers. It is also clear that the Japanese government is planning to continue to make optical computing one of its high priority areas, with its NIPT (New Information Processing Technology project), and are projected to continue to investigate so called sixth generation computer technologies.

Walkup, John F.

1991-09-01

69

Computer Technology Program (REACT). Technical Report.  

ERIC Educational Resources Information Center

Development work of the Computer Technology Program (or REACT-Relevant Educational Applications of Computer Technology) during the period of July 1, 1971 to August 31, 1972 is summarized here. Work during this period included writing and developmental testing of a course in computer careers for high school pupils. This phase took the course…

Otte, Richard

70

Advanced laptop and small personal computer technology  

NASA Technical Reports Server (NTRS)

Advanced laptop and small personal computer technology is presented in the form of the viewgraphs. The following areas of hand carried computers and mobile workstation technology are covered: background, applications, high end products, technology trends, requirements for the Control Center application, and recommendations for the future.

Johnson, Roger L.

1991-01-01

71

Digitized holography: spatial 3D imaging of virtual and real objects  

Microsoft Academic Search

Recent development of computer algorithms and micro fabrication technologies allows us to reconstruct the wave-field of light emitted from a completely virtual 3D scene given by the numerical model. In addition, recent evolution of image sensors and a technique for capturing real object waves makes it possible to digitize the whole process of classical holography. The wave-field of the virtual,

Kyoji Matsushima; Yasuaki Arima; Sumio Nakahara

2011-01-01

72

Computer Technology: State of the Art.  

ERIC Educational Resources Information Center

Describes the nature of modern general-purpose computer systems, including hardware, semiconductor electronics, microprocessors, computer architecture, input output technology, and system control programs. Seven suggested readings are cited. (FM)

Withington, Frederic G.

1981-01-01

73

Moral Responsibility and Computer Technology.  

ERIC Educational Resources Information Center

Noting a recent increase in the number of cases of computer crime and computer piracy, this paper takes up the question, "How can understanding the social context of computing help us--as parents, educators, and members of government and industry--to educate young people to become morally responsible members of an electronic information…

Friedman, Batya

74

Prior Computer Experience and Technology Acceptance  

ERIC Educational Resources Information Center

Prior computer experience with information technology has been identified as a key variable (Lee, Kozar, & Larsen, 2003) that can influence an individual's future use of newer computer technology. The lack of a theory driven approach to measuring prior experience has however led to conceptually different factors being used interchangeably in…

Varma, Sonali

2010-01-01

75

Computer Technology and Education: A Policy Delphi.  

ERIC Educational Resources Information Center

Realizing the educational potential of computer technology largely depends on developing appropriate policies related to the technology. A Policy Delphi method was used to identify changes in education that are both probable and possible on account of the introduction of computers, and to explore potential patterns for arriving at a desired…

Steier, Lloyd P.

76

3D Measurement Technologies for Computer Animation  

Microsoft Academic Search

This paper surveys 3D measurement technologies for computer animation and considers unsolved problems on this subject. 3D measurement technologies are actually very important for converting various 3D objects in the real world to 3D models in the virtual world for computer animation. Current 3D measurement technologies have been developed mainly for measuring objects in industrial or scientific fields, such as

Yasuhito Suenaga

1996-01-01

77

Evaluating Campus Computing Services: Taming the Technology.  

ERIC Educational Resources Information Center

Evaluation of campus computer services has been limited by the ability of higher education administrators to relate their experience in evaluating other, more traditional services to the technical complexity of computing services. The explosive growth of computer technologies requires development of a common framework for their evaluation. (MSE)

Gillespie, Robert G.

1987-01-01

78

Education & Technology: Reflections on Computing in Classrooms.  

ERIC Educational Resources Information Center

This volume examines learning in the age of technology, describes changing practices in technology-rich classrooms, and proposes new ways to support teachers as they incorporate technology into their work. It commemorates the eleventh anniversary of the Apple Classrooms of Tomorrow (ACOT) Project, when Apple Computer, Inc., in partnership with a…

Fisher, Charles, Ed.; Dwyer, David C., Ed.; Yocam, Keith, Ed.

79

From Computer Lab to Technology Class.  

ERIC Educational Resources Information Center

Discussion of integrating technology into elementary school classrooms focuses on teacher training that is based on a three-year plan developed at an elementary school in Marathon, New York. Describes the role of a technology teacher who facilitates technology integration by running the computer lab, offering workshops, and developing inservice…

Sherwood, Sandra

1999-01-01

80

When Computer Technologies Meet the Learning Sciences  

Microsoft Academic Search

This article explores how insights from the learning sciences can guide the effective use of computer technologies to promote learning and how these technologies make new types of learning opportunities possible. The discussion is organized to provide three illustrations of how the introduction of new technologies can have “ripple effects” that influence many different aspects of the teaching and learning

John Bransford; Sean Brophy; Susan Williams

2000-01-01

81

Electron holography at atomic dimensions -- Present state  

SciTech Connect

An electron microscope is a wave optical instrument where the object information is carried by an electron wave. However, an important information, the phase of the electron wave, is lost, because only intensities can be recorded in a conventional electron micrograph. Off-axis electron holography solves this phase problem by encoding amplitude and phase information in an interference pattern, the so-called hologram. After reconstruction, a rather unrestricted wave optical analysis can be performed on a computer. The possibilities as well as the current limitations of off-axis electron holography at atomic dimensions are discussed, and they are illustrated at two applications of structure characterization of {epsilon}-NbN and YBCO-1237. Finally, an electron microscope equipped with a Cs-corrector, a monochromator, and a Moellenstedt biprism is outlined for subangstrom holography.

Lehmann, M.; Lichte, H. [Technische Univ. Dresden (Germany). Inst. fuer Angewandte Physik] [Technische Univ. Dresden (Germany). Inst. fuer Angewandte Physik; Geiger, D.; Lang, G.; Schweda, E. [Univ. Tuebingen (Germany)] [Univ. Tuebingen (Germany)

1999-04-01

82

Two-microphone nearfield acoustical holography  

Microsoft Academic Search

In conventional Nearfield acoustical holography (NAH), a large number of measurements is required to cover the entire source area. In addition, when the complete source comprises several incoherent sub-sources, the sound field must be decomposed into coherent partial fields before projection. The latter operation is made possible by using a fixed array of reference microphones and computing the reference cross-spectral

Yong Thung Cho; J. Stuart Bolton; Yong-Joe Kim; Hyu-Sang Kwon

2005-01-01

83

Electron holography—basics and applications  

NASA Astrophysics Data System (ADS)

Despite the huge progress achieved recently by means of the corrector for aberrations, allowing now a true atomic resolution of 0.1 nm, hence making it an unrivalled tool for nanoscience, transmission electron microscopy (TEM) suffers from a severe drawback: in a conventional electron micrograph only a poor phase contrast can be achieved, i.e. phase structures are virtually invisible. Therefore, conventional TEM is nearly blind for electric and magnetic fields, which are pure phase objects. Since such fields provoked by the atomic structure, e.g. of semiconductors and ferroelectrics, largely determine the solid state properties, hence the importance for high technology applications, substantial object information is missing. Electron holography in TEM offers the solution: by superposition with a coherent reference wave, a hologram is recorded, from which the image wave can be completely reconstructed by amplitude and phase. Now the object is displayed quantitatively in two separate images: one representing the amplitude, the other the phase. From the phase image, electric and magnetic fields can be determined quantitatively in the range from micrometre down to atomic dimensions by all wave optical methods that one can think of, both in real space and in Fourier space. Electron holography is pure wave optics. Therefore, we discuss the basics of coherence and interference, the implementation into a TEM, the path of rays for recording holograms as well as the limits in lateral and signal resolution. We outline the methods of reconstructing the wave by numerical image processing and procedures for extracting the object properties of interest. Furthermore, we present a broad spectrum of applications both at mesoscopic and atomic dimensions. This paper gives an overview of the state of the art pointing at the needs for further development. It is also meant as encouragement for those who refrain from holography, thinking that it can only be performed by specialists in highly specialized laboratories. In fact, a modern TEM built for atomic resolution and equipped with a field emitter or a Schottky emitter, well aligned by a skilled operator, can deliver good holograms. Running commercially available image processing software and mathematics programs on a laptop-computer is sufficient for reconstruction of the amplitude and phase images and extracting desirable object information.

Lichte, Hannes; Lehmann, Michael

2008-01-01

84

Computing, Information and Communications Technology (CICT) Website  

NASA Technical Reports Server (NTRS)

The Computing, Information and Communications Technology Program (CICT) was established in 2001 to ensure NASA's Continuing leadership in emerging technologies. It is a coordinated, Agency-wide effort to develop and deploy key enabling technologies for a broad range of mission-critical tasks. The NASA CICT program is designed to address Agency-specific computing, information, and communications technology requirements beyond the projected capabilities of commercially available solutions. The areas of technical focus have been chosen for their impact on NASA's missions, their national importance, and the technical challenge they provide to the Program. In order to meet its objectives, the CICT Program is organized into the following four technology focused projects: 1) Computing, Networking and Information Systems (CNIS); 2) Intelligent Systems (IS); 3) Space Communications (SC); 4) Information Technology Strategic Research (ITSR).

Hardman, John; Tu, Eugene (Technical Monitor)

2002-01-01

85

Technologic advances in computed tomography.  

PubMed

Technologic improvements in CT continue. As always, emphasis in the past year has been on reducing scan times. Units employing slip-ring technology are now available. This technology makes possible spiral scanning, which promises to further reduce the effects of image-degrading patient motion, as well as opening new possibilities for quantitative and dynamic CT studies. These applications are discussed here and an update on the advances on cine-CT and the Dynamic Spatial Reconstructor unit is provided. Three-dimensional reconstructions obtained at very short scan times promise to be of particular benefit for scanning the bronchial tree. Finally, patient doses of radiation in CT are discussed. PMID:2049277

Villafana, T

1991-04-01

86

Impact of rapidly changing computer technology on computer crime  

Microsoft Academic Search

This paper reviews the changes in computer technology that have already occurred over the past 25 years, indicates the direction of future developments and describes the potential impact of these developments on the extent and types of computer-related crime.

Marvin Sendrow

1982-01-01

87

Computers and Writing. Tech Use Guide: Using Computer Technology.  

ERIC Educational Resources Information Center

One of nine brief guides for special educators on using computer technology, this guide focuses on the use of computers to improve skills and attitudes in writing instruction. Pre-writing tools such as group brainstorming, story webs, free-writing, journal entries, and prewriting guides help generate ideas and can be carried out either on or off…

Dalton, Bridget

88

(CICT) Computing, Information, and Communications Technology Overview  

NASA Technical Reports Server (NTRS)

The goal of the Computing, Information, and Communications Technology (CICT) program is to enable NASA's Scientific Research, Space Exploration, and Aerospace Technology Missions with greater mission assurance, for less cost, with increased science return through the development and use of advanced computing, information and communications technologies. This viewgraph presentation includes diagrams of how the political guidance behind CICT is structured. The presentation profiles each part of the NASA Mission in detail, and relates the Mission to the activities of CICT. CICT's Integrated Capability Goal is illustrated, and hypothetical missions which could be enabled by CICT are profiled. CICT technology development is profiled.

VanDalsem, William R.

2003-01-01

89

Hardware Considerations for Computer Based Education in the 1980's.  

ERIC Educational Resources Information Center

In the future, computers will be needed to sift through the vast proliferation of available information. Among new developments in computer technology are the videodisc microcomputers and holography. Predictions for future developments include laser libraries for the visually handicapped and Computer Assisted Dialogue. (JN)

Hirschbuhl, John J.

1980-01-01

90

Computer technology forecast study for general aviation  

NASA Technical Reports Server (NTRS)

A multi-year, multi-faceted program is underway to investigate and develop potential improvements in airframes, engines, and avionics for general aviation aircraft. The objective of this study was to assemble information that will allow the government to assess the trends in computer and computer/operator interface technology that may have application to general aviation in the 1980's and beyond. The current state of the art of computer hardware is assessed, technical developments in computer hardware are predicted, and nonaviation large volume users of computer hardware are identified.

Seacord, C. L.; Vaughn, D.

1976-01-01

91

Implementing Computer Technologies: Teachers' Perceptions and Practices  

ERIC Educational Resources Information Center

This study investigates personal and setting characteristics, teacher attitudes, and current computer technology practices among 764 elementary and secondary teachers from both private and public school sectors in Quebec. Using expectancy-value theory, the Technology Implementation Questionnaire (TIQ) was developed; it consists of 33 belief items…

Wozney, Lori; Venkatesh, Vivek; Abrami, Philip

2006-01-01

92

Meridian: A Middle School Computer Technologies Journal  

NSDL National Science Digital Library

This new ejournal, edited and reviewed by graduate students at North Carolina State University, has a simple focus: to help demonstrate to middle school teachers the best ways of applying computer technologies to classroom teaching and learning. The inaugural issue contains articles about play designed learning, using technology to learn about technology, and gender and digital media. The second issue is slated for June 1998, and submissions are welcomed.

1998-01-01

93

Computer generated holograms - An historical review  

Microsoft Academic Search

The methods and techniques of computer generated holography are described from a historical viewpoint. Topics discussed include computer generated optical filters, a description of the overall scheme of computer generated holography, and types of computer generated holograms, such as detour and nondetour phase holograms. Some applications of computer generated holography are briefly discussed with several different uses grouped into broad

G. Tricoles

1987-01-01

94

Cloud Computing Technologies and Applications  

NASA Astrophysics Data System (ADS)

In a nutshell, the existing Internet provides to us content in the forms of videos, emails and information served up in web pages. With Cloud Computing, the next generation of Internet will allow us to "buy" IT services from a web portal, drastic expanding the types of merchandise available beyond those on e-commerce sites such as eBay and Taobao. We would be able to rent from a virtual storefront the basic necessities to build a virtual data center: such as CPU, memory, storage, and add on top of that the middleware necessary: web application servers, databases, enterprise server bus, etc. as the platform(s) to support the applications we would like to either rent from an Independent Software Vendor (ISV) or develop ourselves. Together this is what we call as "IT as a Service," or ITaaS, bundled to us the end users as a virtual data center.

Zhu, Jinzy

95

Simple wave-field rendering for photorealistic reconstruction in polygon-based high-definition computer holography  

NASA Astrophysics Data System (ADS)

A simple and practical technique is presented for creating fine three-dimensional (3D) images with polygon-based computer-generated holograms. The polygon-based method is a technique for computing the optical wave-field of virtual 3D scenes given by a numerical model. The presented method takes less computation time than common point-source methods and produces fine spatial 3D images of deep 3D scenes that convey a strong sensation of depth, unlike conventional 3D systems providing only binocular disparity. However, smooth surfaces cannot be reconstructed using the presented method because the surfaces are approximated by planar polygons. This problem is resolved by introducing a simple rendering technique that is almost the same as that in common computer graphics, since the polygon-based method has similarity to rendering techniques in computer graphics. Two actual computer holograms are presented to verify and demonstrate the proposed technique. One is a hologram of a live face whose shape is measured using a 3D laser scanner that outputs polygon-mesh data. The other is for a scene including the moon. Both are created employing the proposed rendering techniques of the texture mapping of real photographs and smooth shading.

Matsushima, Kyoji; Nishi, Hirohito; Nakahara, Sumio

2012-04-01

96

Haptic Holography/Touching the Ethereal  

NASA Astrophysics Data System (ADS)

Haptic Holography, was perhaps, first proposed by workers at MIT in the 90s. The Media Lab, headed up by Dr. Stephen Benton, with published papers by Wendy Plesiak and Ravi Pappuh. -1 Recent developments in both the technology of digital holography and haptics have made it practical to conduct further investigations. Haptic holography is auto-stereoscopic and provides co-axial viewing for the user. Haptic holography may find application in medical & surgical training and as a new form of synthetic reality for artists and designers. At OCAD's PHASE Lab (Prototypes for Holographic Art and Science Explorations) workers are exploring hybrid forms of augmented reality, that combine haptics, interactivity and auto-stereoscopic imagery. Conventional Haptic environments, while presenting a 3D physics environment, typically provide a 2D visual work/play space. Orienteering in such an environment creates an uncertain spatial relationship for the user. Our group creates 3d models from which we create holographic constructs. The same model is used to create the physics environment. The two models are super-imposed. The result: Holograms you can touch.

Page, Michael

2013-02-01

97

Research on application of computer technology in teaching college mathematics  

Microsoft Academic Search

This paper discusses the applications of computer technology to the college mathematics' education. The computer technology education takes the computer as the main tool, merging audiovisual media (voice and image) and computer media (file, image and animation) as one teaching system, to carry out the educational activities. Computer technology represents the great advantage in teaching. The paper also analyzes the

Dong Chen; Jing Yang; Lingli Xia

2010-01-01

98

National Challenge in Computer Science and Technology.  

National Technical Information Service (NTIS)

The report is aimed at people in government, industry, and academia who are concerned about the future of computing technology as a critical area of national strength, particularly at a time when America's position in other areas is in apparent decline. T...

1988-01-01

99

Assistive Computer Technology: Opening New Doorways.  

ERIC Educational Resources Information Center

Provides student services administrators and staff with information concerning the basic computer access needs of students with disabilities. Explores issues like training and support for students, faculty, and staff; funding; purchase and maintenance of equipment; technology integration; professional competence; legal considerations; and the…

Brown, Carl

1993-01-01

100

Women Workers as Users of Computer Technology.  

ERIC Educational Resources Information Center

Discussion of expectations, trends, and implications of growth of computer technology and its effect on women workers argues that the experience of women is different from that of men in the nature of jobs in which women are found, their training and education, home-family conflict, and discrimination. The impact on women of increasing…

Larwood, Laurie

1992-01-01

101

Business/Computer Technologies. State Competency Profile.  

ERIC Educational Resources Information Center

This document contains 272 competencies, grouped into 36 units, for tech prep programs in the business/computer technology cluster. The competencies were developed through collaboration of Ohio business, industry, and labor representatives and secondary and associate degree educators. The competencies are rated either "essential" (necessary to…

Ohio State Univ., Columbus. Center on Education and Training for Employment.

102

Instructional Technology in Computer Science Education  

ERIC Educational Resources Information Center

The Web, the Internet, the intranet and associated resources, campus computer labs, smart classrooms, course management systems, and a plethora of software packages all offer opportunities for every classroom instructor to enrich in-class and out-of-class activities. Why should an instructor consider the integration of technology into their…

Jenny, Frederick J.

2004-01-01

103

Computer technology forecasting at the National Laboratories  

SciTech Connect

The DOE Office of ADP Management organized a group of scientists and computer professionals, mostly from their own national laboratories, to prepare an annually updated technology forecast to accompany the Department's five-year ADP Plan. The activities of the task force were originally reported in an informal presentation made at the ACM Conference in 1978. This presentation represents an update of that report. It also deals with the process of applying the results obtained at a particular computing center, Brookhaven National Laboratory. Computer technology forecasting is a difficult and hazardous endeavor, but it can reap considerable advantage. The forecast performed on an industry-wide basis can be applied to the particular needs of a given installation, and thus give installation managers considerable guidance in planning. A beneficial side effect of this process is that it forces installation managers, who might otherwise tend to preoccupy themselves with immediate problems, to focus on longer term goals and means to their ends. (RWR)

Peskin, A M

1980-01-01

104

Evaluation of Advanced Computing Techniques and Technologies: Reconfigurable Computing  

NASA Technical Reports Server (NTRS)

The focus of this project was to survey the technology of reconfigurable computing determine its level of maturity and suitability for NASA applications. To better understand and assess the effectiveness of the reconfigurable design paradigm that is utilized within the HAL-15 reconfigurable computer system. This system was made available to NASA MSFC for this purpose, from Star Bridge Systems, Inc. To implement on at least one application that would benefit from the performance levels that are possible with reconfigurable hardware. It was originally proposed that experiments in fault tolerance and dynamically reconfigurability would be perform but time constraints mandated that these be pursued as future research.

Wells, B. Earl

2003-01-01

105

Patch nearfield acoustical holography  

Microsoft Academic Search

Nearfield acoustical holography (NAH) requires the measurement of the pressure field over a complete surface in order to recover the normal velocity on a nearby vibrating concentric surface. Patch NAH provides a major advancement by eliminating the need for complete surface pressure scans--only a small area needs to be scanned to determine the normal velocity on the corresponding (small area)

Earl G. Williams

2002-01-01

106

Nearfield Acoustical Holography  

Microsoft Academic Search

Nearfield acoustical holography (NAH) is a method by which a set of acoustic pressure measurements at points located on a specific surface (called a hologram) can be used to image sources on vibrating surfaces on the acoustic field in three-dimensional space. NAH data are processed to take advantage of the evanescent wavefield to image sources that are separated less that

Sabih I. Hayek

2008-01-01

107

Digital Holography Display (2)  

Microsoft Academic Search

This paper describes the extension work from the last Digital Holography Projector System. From the developed works shows that, some unforeseen factors have created the difficulties for the system alignment. Such factors are the DMD frame rate, light source and diffractive zero order. It is really the challenging development works to achieve the virtual 3D model display on the high

Cheok Peng Lee; A. Asundi; Yang Yu; Zhen Zhong Xiao

2011-01-01

108

Holography without Fuss.  

ERIC Educational Resources Information Center

Outlines what a hologram is, the main types of holography, and how a simple system producing a white light reflection hologram can be set up in a school physics laboratory. Discusses the basic optics of the hologram and procedures and materials for making holograms in school. (YP)

Davies, Steve

1989-01-01

109

Development of a Novel Breast Cancer Detector based on Improved Holography Concave Grating Imaging Spectrometer  

NASA Astrophysics Data System (ADS)

Breast cancer can be detected by B-mode ultrasonic imaging, X-mammography, CT imaging, and MRI. But some drawbacks existed in these methods, their applications was limited in some certain. So, a novel high resolution breast cancer detector (BCD) is developed in this paper. Meanwhile, an improved holography concave grating imaging spectrometer (HCGIS) is designed. In this HCGIS, the holography concave grating is used as the diffraction grating. Additionally, CCD with combined image acquisition (IAQ) card and the 3D scan platform are used as the spectral image acquisition component. This BCD consists of the light source unit, light-path unit, check cavity, splitting-light unit, spectrum acquisition and imaging unit, signal processing unit, computer and data analysis software unit, etc. Experimental results show that the spectral range of the novel BCD can reach 300-1000 nm, its wavelength resolution can reach 1nm, and this system uses the back-split-light technology and the splitting-light structure of holography concave grating. Compared with the other instruments of breast cancer detection, this BCD has many advantages, such as, compacter volume, simpler algorithm, faster processing speed, higher accuracy, cheaper cost and higher resolution, etc. Therefore, this BCD will have the potential values in the detection of breast disease.

Ren, Zhong; Liu, Guodong; Zeng, Lvming; Huang, Zhen

2011-01-01

110

Real-time visualization and analysis of airflow field by use of digital holography  

NASA Astrophysics Data System (ADS)

The measurement and analysis of airflow field is very important in fluid dynamics. For airflow, smoke particles can be added to visually observe the turbulence phenomena by particle tracking technology, but the effect of smoke particles to follow the high speed airflow will reduce the measurement accuracy. In recent years, with the advantage of non-contact, nondestructive, fast and full-field measurement, digital holography has been widely applied in many fields, such as deformation and vibration analysis, particle characterization, refractive index measurement, and so on. In this paper, we present a method to measure the airflow field by use of digital holography. A small wind tunnel model made of acrylic glass is built to control the velocity and direction of airflow. Different shapes of samples such as aircraft wing and cylinder are placed in the wind tunnel model to produce different forms of flow field. With a Mach-Zehnder interferometer setup, a series of digital holograms carrying the information of airflow filed distributions in different states are recorded by CCD camera and corresponding holographic images are numerically reconstructed from the holograms by computer. Then we can conveniently obtain the velocity or pressure information of the airflow deduced from the quantitative phase information of holographic images and visually display the airflow filed and its evolution in the form of a movie. The theory and experiment results show that digital holography is a robust and feasible approach for real-time visualization and analysis of airflow field.

Di, Jianglei; Wu, Bingjing; Chen, Xin; Liu, Junjiang; Wang, Jun; Zhao, Jianlin

2013-04-01

111

NASA Future Computing and Communications Technologies  

NSDL National Science Digital Library

A series of NASA Webcasts on Future Computing and Communications Technologies, broadcast live in April and May 2003, are now archived and viewable at this site. Each Webcast was approximately an hour in length and featured notable scientists and technology experts from NASA projects and laboratories. Originally intended for high school juniors and seniors, the presentations addressed issues such as spaceborne communications, nanotechnology, artificially evolving systems, and more. These Webcasts are an excellent resource to learn about NASA research from a high level perspective. This site is also reviewed in the September 26, 2003 NSDL MET Report.

112

Reviews of computing technology: Client-server technology  

SciTech Connect

One of the most frequently heard terms in the computer industry these days is ``client-server.`` There is much misinformation available on the topic, and competitive pressures on software vendors have led to a great deal of hype with little in the way of supporting products. The purpose of this document is to explain what is meant by client-server applications, why the Advanced Technology and Architecture (ATA) section of the Information Resources Management (IRM) Department sees this emerging technology as key for computer applications during the next ten years, and what ATA sees as the existing standards and products available today. Because of the relative immaturity of existing client-server products, IRM is not yet guidelining any specific client-server products, except those that are components of guidelined data communications products or database management systems.

Johnson, S.M.

1990-09-01

113

Reviews of computing technology: Client-server technology  

SciTech Connect

One of the most frequently heard terms in the computer industry these days is client-server.'' There is much misinformation available on the topic, and competitive pressures on software vendors have led to a great deal of hype with little in the way of supporting products. The purpose of this document is to explain what is meant by client-server applications, why the Advanced Technology and Architecture (ATA) section of the Information Resources Management (IRM) Department sees this emerging technology as key for computer applications during the next ten years, and what ATA sees as the existing standards and products available today. Because of the relative immaturity of existing client-server products, IRM is not yet guidelining any specific client-server products, except those that are components of guidelined data communications products or database management systems.

Johnson, S.M.

1990-09-01

114

Reviews of computing technology: Object-oriented technology  

SciTech Connect

A useful metaphor in introducing object-oriented concepts is the idea of a computer hardware manufacturer assembling products from an existing stock of electronic parts. In this analogy, think of the parts as pieces of computer software and of the finished products as computer applications. Like its counterpart, the object is capable of performing its specific function in a wide variety of different applications. The advantages to assembling hardware using a set of prebuilt parts are obvious. The design process is greatly simplified in this scenario, since the designer needs only to carry the design down to the chip level, rather than to the transistor level. As a result, the designer is free to develop a more reliable and feature rich product. Also, since the component parts are reused in several different products, the parts can be made more robust and subjected to more rigorous testing than would be economically feasible for a part used in only one piece of equipment. Additionally, maintenance on the resulting systems is simplified because of the part-level consistency from one type of equipment to another. The remainder of this document introduces the techniques used to develop objects, the benefits of the technology, outstanding issues that remain with the technology, industry direction for the technology, and the impact that object-oriented technology is likely to have on the organization. While going through this material, the reader will find it useful to remember the parts analogy and to keep in mind that the overall purpose of object-oriented technology is to create software parts and to construct applications using those parts.

Skeen, D.C.

1993-03-01

115

Holography at x-ray wavelengths  

SciTech Connect

We discuss alternative holographic techniques for imaging microscopic structures with a short-pulse, high intensity, high-quantum-energy laser. We find that Fresnel transform holography using a photoresist for registration of the hologram is most likely to be within the scope of near term technology. Although it has advantages in time gating, using an in-line electron microscope for hologram registration has an unacceptable tradeoff between quantum efficiency and resolution. Fourier transform holography using a reflector to generate the reference beam might be a reasonable alternative using low resolution film, but is necessarily more complicated. We discuss the dependence of the required laser intensity on the resolution sought and on the elastic and absorption cross sections. We conclude that resonant scattering must be used to obtain holograms at reasonable intensities.

Solem, T.C.; Baldwin, G.C.; Chapline, G.F.

1981-01-01

116

Infrared holography using a microbolometer array.  

PubMed

We describe a series of experiments to demonstrate holography at far-infrared wavelengths using an uncooled microbolometer array. Simple interference patterns and Fresnel zone holograms are recorded with a 10 W cw CO(2) laser illumination in a Mach-Zehnder interferometer setup. A sparse-sampling method is used to sample the hologram at a rate dependent on the bandwidth of the object wavefront rather than the carrier frequency. The samples are then used to reconstruct the complex object wavefront in the hologram plane, which is Fresnel backpropagated for image reconstruction. Uncooled microbolometer arrays are most commonly used in passive mode to image the thermal-blackbody radiation. Their technology has matured to include the wavelength range of far-infrared to submillimeter radiation. The use of microbolometers with active illumination for holography, as described in this paper, suggests their interesting future applications. PMID:18239701

George, Nicholas; Khare, Kedar; Chi, Wanli

2008-02-01

117

Computational Support for Technology- Investment Decisions  

NASA Technical Reports Server (NTRS)

Strategic Assessment of Risk and Technology (START) is a user-friendly computer program that assists human managers in making decisions regarding research-and-development investment portfolios in the presence of uncertainties and of non-technological constraints that include budgetary and time limits, restrictions related to infrastructure, and programmatic and institutional priorities. START facilitates quantitative analysis of technologies, capabilities, missions, scenarios and programs, and thereby enables the selection and scheduling of value-optimal development efforts. START incorporates features that, variously, perform or support a unique combination of functions, most of which are not systematically performed or supported by prior decision- support software. These functions include the following: Optimal portfolio selection using an expected-utility-based assessment of capabilities and technologies; Temporal investment recommendations; Distinctions between enhancing and enabling capabilities; Analysis of partial funding for enhancing capabilities; and Sensitivity and uncertainty analysis. START can run on almost any computing hardware, within Linux and related operating systems that include Mac OS X versions 10.3 and later, and can run in Windows under the Cygwin environment. START can be distributed in binary code form. START calls, as external libraries, several open-source software packages. Output is in Excel (.xls) file format.

Adumitroaie, Virgil; Hua, Hook; Lincoln, William; Block, Gary; Mrozinski, Joseph; Shelton, Kacie; Weisbin, Charles; Elfes, Alberto; Smith, Jeffrey

2007-01-01

118

Digital Holography Display (2)  

NASA Astrophysics Data System (ADS)

This paper describes the extension work from the last Digital Holography Projector System. From the developed works shows that, some unforeseen factors have created the difficulties for the system alignment. Such factors are the DMD frame rate, light source and diffractive zero order. It is really the challenging development works to achieve the virtual 3D model display on the high speed rotation screen. The three most key factors are emphasizing: 1) The display device's frame rate; 2) The light source orientation angle; and 3) The zero order filtering optic. 1) This device's is the digital micro mirror, in short is DMD. It is the high speed switching device has developed by the most recent technology. The switching frame rate can go up as high as 291fps. At first, the 8 bits depth file must be digitalized and stored for DMD onboard Ram. The digitalized data are transmitting from the PC USB to DMD onboard Ram. Instead of the data are downloading directly from the PC to DVI or VGA during display, this downloading method cause slower down the display speed, which is the common frame rate of 30 Hz. Next, the onboard Ram data then transfer to the DMD mirror's for display, at the 8 bits 291 fps speed. At this frame rate, the display 2D image can almost cover for 10 of out of the 360 0 in 1 revolution. 2) This laser light source must be installed such that free for orientated in any arbitrary angle from 220 to 450. Which is normalized to the DMD mirrors and the brief sketch show on figure (a). The purpose of orientated the light source is ensure that multi diffractive order would be reflected straight from the mirrors. (This multi diffractive order is the phenomenon of the digital micro mirror's characteristic). This mean, the reconstruct images would be followed the DMD normalized direction reflected up to fibre conduit. Moreover, this orientated method install of the laser light source is making space for other optical lenses or device driver/controller. Because, all equipments and components can be easy line up and mounted in the compartment. 3) This solid 6 mm diameter fibre conduit is implemented to transmit the higher diffractive image, it is also the brightest and clearer image as compare to other lower order images. This means many of the lower order and blurred images would be neglected for display and consider as the energy lost.

Lee, Cheok Peng; Asundi, A.; Yu, Yang; Xiao, Zhen Zhong

119

Ultrasonic holography in metallurgy and engineering  

Microsoft Academic Search

The feasibility of applying ultrasonic holography to metallurgical nondestructive testing under full-scale industrial conditions is examined. The basics of optical holography and ultrasonic holography are reviewed, and ultrasonic holography is compared to sonar as NDT technique. Liquid surface levitation and scanned aperture (synthetic aperture) holographic techniques are described and compared, along with helical scanning of cylinders. The value of liquid

J. M. Coffey; M. J. Whittle

1976-01-01

120

Homodyne scanning holography  

PubMed Central

We have developed a modified version of a scanning holography microscope in which the Fresnel Zone Plates (FZP) are created by a homodyne rather than a heterodyne interferometer. Therefore, during the scanning the projected pattern on the specimen is frozen rather than varied as previously. In each scanning period the system produces an on-axis Fresnel hologram. The twin image problem is solved by a linear combination of at least three holograms taken with three FZPs with different phase values.

Rosen, Joseph; Indebetouw, Guy; Brooker, Gary

2006-01-01

121

Future Applications of Electronic Technology to Education.  

ERIC Educational Resources Information Center

Developments in electronic technology that have improved and linked together telecommunication and computers are discussed, as well as their use in instruction, implications of this use, and associated issues. The first section briefly describes the following developments: microcomputers and microprocessors, bubble memory, lasers, holography,…

Lewis, Arthur J.; And Others

122

Computer technology-cognitive psychology interface and science performance assessment  

Microsoft Academic Search

The emerging interface between computer technology and cognitive psychology for performance assessment in science education\\u000a is explored. Cognitive theories of learning offer promises to transform computer technology from a test administration tool\\u000a into a process assessment tool, and computer technology offers a medium for studying the cognitive processes of learning.\\u000a Interface theories and interface technologies are briefly discussed. The technology-psychology

David D. Kumar; Stanley L. Helgeson; Arthur L. White

1994-01-01

123

Development of computational spacer patterning technology  

NASA Astrophysics Data System (ADS)

Computational spacer patterning technology (SPT) has been developed for the first time to address the challenges concerning hotspots and mask specifications in SPT. A simulation combined with a lithography, etching and deposition model shows the strong correlation of 0.999, 0.993, 0.980 with the experimental critical dimension (CD), mask error-enhancement factor (MEEF) and defect printability through a series of spacer processes, respectively. Furthermore, a design for manufacturability (DfM) flow using computational SPT can find hotspots caused by spacer patterning processes as well as those caused by lithography process and help designers make the circuit layout more robust. Besides, a newly defined MEEF and defect printability, which are primary metrics for mask specification, can be predicted so accurately by using computational SPT that the new scheme to determine appropriate mask specifications is shown to be feasible under the spacer patterning process condition. Thus, computational SPT is found to be promising for addressing the challenges concerning hotspot removal and mask specification in the upcoming 20-30nm node and beyond.

Mashita, Hiromitsu; Taguchi, Takafumi; Nakajima, Fumiharu; Iyanagi, Katsumi; Kotani, Toshiya; Mimotogi, Shoji; Inoue, Soichi

2010-04-01

124

Teaching with Technology: The Classroom Manager. Cost-Conscious Computing.  

ERIC Educational Resources Information Center

Teachers discuss how to make the most of technology in the classroom during a tight economy. Ideas include recycling computer printer ribbons, buying replacement batteries for computer power supply packs, upgrading via software, and soliciting donated computer equipment. (SM)

Smith, Rhea; And Others

1992-01-01

125

Evaluating Computer Technology Integration in a Centralized School System  

ERIC Educational Resources Information Center

The study evaluated the current situation in Cyprus elementary classrooms regarding computer technology integration in an attempt to identify ways of expanding teachers' and students' experiences with computer technology. It examined how Cypriot elementary teachers use computers, and the factors that influence computer integration in their…

Eteokleous, N.

2008-01-01

126

Fostering an informal learning community of computer technologies at school  

Microsoft Academic Search

Computer technologies develop at a challenging fast pace. Formal education should not only teach students basic computer skills to meet current computer needs, but also foster student development of informal learning ability for a lifelong learning process. On the other hand, students growing up in the digital world are often more skilled with computer technologies than their teachers. We describe

Lu Xiao; John M. Carroll

2007-01-01

127

Techniques for introducing holography into middle school educational programs  

NASA Astrophysics Data System (ADS)

Holography is uniquely suitable as an educational tool for the middle school curriculum. By performing the simplest enjoyable experiments, students are introduced to many basic concepts of physics and myriads of technological applications. The most difficult part of introducing such a program to school is convincing educators, teachers, and parents that holography is a worthy subject. The most effective way is to find opportunities to physically demonstrate to them how to make holograms safely at a low cost and to show them applications using real hologram.

Jeong, Tung H.

1998-08-01

128

DSN microwave antenna holography  

NASA Technical Reports Server (NTRS)

The DSN microwave antenna holography project will obtain three-dimensional pictures of the large DSN antenna surfaces. These pictures must be of suffi icient resolution to allow adjustment of the reflector panels to an rms surface of 0.5 mm (0.25 mm, goal). The major parameters and equations needed to define a holographic measurement system are outlined and then the proof of concept demonstration measurement that was made at DSS-43 (Australia) that resulted in contour maps with spatial resolution of 7 m in the aperture plane and resolution orthogonal to the aperture plane of 0.7 mm was discussed.

Rochblatt, D. J.; Seidel, B. L.

1984-01-01

129

Noise estimation for off-axis electron holography.  

PubMed

Off-axis electron holography provides access to the phase of the elastically scattered wave in a transmission electron microscope at scales ranging from several hundreds of nanometres down to 0.1nm. In many cases the reconstructed phase shift is directly proportional to projected electric and magnetic potentials rendering electron holography a useful and established characterisation method for materials science. However, quantitative interpretation of experimental phase shifts requires quantitative knowledge about the noise, which has been previously established for some limiting cases only. Here, we present a general noise transfer formalism for off-axis electron holography allowing to compute the covariance (noise) of reconstructed amplitude and phase from characteristic detector functions and general properties of the reconstruction process. Experimentally, we verify the presented noise transfer formulas for two different cameras with and without objects within the errors given by the experimental noise determination. PMID:24821224

Röder, Falk; Lubk, Axel; Wolf, Daniel; Niermann, Tore

2014-09-01

130

Information reconstruction based on phase-shifting technique in digital holography  

Microsoft Academic Search

In digital holography technique, we use CCD for recording. The reconstruction executes in computer and can also realize special reconstruction like conventional holography. The computer-reconstruction can be carried out by mathematical transform for single-fringe hologram, which has larger additive error. Now we import phase-shifting technique which can improve the reconstructive precision. Meanwhile it brings new problems because this means can

Yunfang Jiao; Yingjie Yu; Zhiwen Lu

2003-01-01

131

Dynamic imaging through turbid media based on digital holography.  

PubMed

Imaging through turbid media using visible or IR light instead of harmful x ray is still a challenging problem, especially in dynamic imaging. A method of dynamic imaging through turbid media using digital holography is presented. In order to match the coherence length between the dynamic object wave and the reference wave, a cw laser is used. To solve the problem of difficult focusing in imaging through turbid media, an autofocus technology is applied. To further enhance the image contrast, a spatial filtering technique is used. A description of digital holography and experiments of imaging the objects hidden in turbid media are presented. The experimental result shows that dynamic images of the objects can be achieved by the use of digital holography. PMID:24690643

Li, Shiping; Zhong, Jingang

2014-03-01

132

Orange computing: Challenges and opportunities for awareness science and technology  

Microsoft Academic Search

This paper presents a newly emerging technology called orange computing for humanistic care applications. Orange computing refers to health, happiness, and physiopsychological care computing, which focuses on designing algorithms and systems for enhancing body and mind balance. Compared with green computing, orange computing lays more emphasis on humanistic care, particularly the elderly or those who require a certain degree of

Jhing-Fa Wangt; Bo-Wei Chen

2011-01-01

133

Managing and directing innovation in the holography business  

Microsoft Academic Search

The intellectual property (IP) space associated with core high-tech innovations, such as holography, tends to rapidly expand in many directions as new applications and improvements to the core technology are realized. Patents soon start to quickly fill regions of the IP space to varying densities, often before any commercial product is available. Complicating matters is the fact that the patents

Joseph E. Gortych; Harold Abilock

2006-01-01

134

Ultrasonic imaging of subsurface objects using photorefractive dynamic holography  

Microsoft Academic Search

The INEEL has developed a photorefractive ultrasonic imaging technology that records both phase and amplitude of ultrasonic waves on the surface of solids. Phase locked dynamic holography provides full field images of these waves scattered from subsurface defects in solids, and these data are compared with theoretical predictions. Laser light reflected by a vibrating surface is imaged into a photorefractive

Vance Albert Deason; Kenneth Louis Telschow; Scott Marshall Watson

2001-01-01

135

Active terahertz holography  

NASA Astrophysics Data System (ADS)

We present a novel technology to dynamically control the wave front of the terahertz (THz) beam with photo-generated carriers. The computer generated hologram is projected onto a silicon wafer by a conventional optical spatial light modulator. The photo-generated carriers on the silicon surface will from a hologram to modulate the wave front of the input THz beam. Some special field distributions and vortex beams are generated using this method. This technology is broadband, structure free, tunable, and all-optical controllable. It will provide numerous possible applications in future THz imaging and communication systems.

Xie, Zhenwei; Wang, Xinke; Zhang, Yan

2013-12-01

136

Computer-aided design and computer science technology  

NASA Technical Reports Server (NTRS)

A description is presented of computer-aided design requirements and the resulting computer science advances needed to support aerospace design. The aerospace design environment is examined, taking into account problems of data handling and aspects of computer hardware and software. The interactive terminal is normally the primary interface between the computer system and the engineering designer. Attention is given to user aids, interactive design, interactive computations, the characteristics of design information, data management requirements, hardware advancements, and computer science developments.

Fulton, R. E.; Voigt, S. J.

1976-01-01

137

Teacher Attitudes toward and Knowledge of Computer Technology.  

ERIC Educational Resources Information Center

Examines the literature that discusses teacher attitudes toward and knowledge of computer technology to determine how they incorporate it into their classrooms. Topics include motivation; training; support; computer anxiety; deterrents to the use of computer technology; and training needs, including inservice and staff development and…

Hardy, Janice V.

1998-01-01

138

Mobile Computing and Ubiquitous Networking: Concepts, Technologies and Challenges.  

ERIC Educational Resources Information Center

Analyzes concepts, technologies and challenges related to mobile computing and networking. Defines basic concepts of cellular systems. Describes the evolution of wireless technologies that constitute the foundations of mobile computing and ubiquitous networking. Presents characterization and issues of mobile computing. Analyzes economical and…

Pierre, Samuel

2001-01-01

139

Computer Technology at Community Colleges. AACC Research Brief.  

ERIC Educational Resources Information Center

A survey conducted in the fall of 1996 shows that a majority of community colleges have the following technological amenities: campus computer labs, Internet connectivity, campus computer networks, increased funding for instructional technology, and separate instructional systems departments. The Community College Computer Survey was sent to…

Kienzl, Gregory; Li, Yong

140

Computer Technology and Education: Past Performance and Future Promise  

Microsoft Academic Search

The last decade has seen the emergence of an unparalleled interest in the use of information technology, particularly computer technology, in our schools. Educational authorities at all levels have put great efforts into equipping schools with computers, training teachers and students in their use, and experimenting with various aspects of computer?assisted instruction. But what have we learned from these experiences

Tom Rich

1991-01-01

141

Instructional Computer Technology: Implications for Gender Achievement in Nigeria  

Microsoft Academic Search

This study examined the instructional computer technology with its implications for gender achievement in Nigeria. The setting was in Graphcom Independent Educational Computer Laboratory, Ilorin in Nigeria. The participants were randomly selected Junior Secondary School (JSS) III students in Ilorin West local government area of Kwara State for a holiday computer technology instruction. A total of 30 students (15 boys

2007-01-01

142

Application of Advanced Computational Technology to Propulsion CFD (Computational Fluid Dynamics).  

National Technical Information Service (NTIS)

The Internal Fluid Mechanics Division of the NASA Lewis Research Center is combining the key elements of computational fluid dynamics, aerothermodynamic experiments, and advanced computational technology to bring internal computational fluid dynamics (ICF...

J. R. Szuch

1988-01-01

143

Holography Experiments on Optical Imaging.  

ERIC Educational Resources Information Center

Describes experiments intended to produce a better understanding of the holographic method of producing images and optical imaging by other optical systems. Application of holography to teaching physics courses is considered. (Author/SA)

Bonczak, B.; Dabrowski, J.

1979-01-01

144

Reconfigurable Nano-Plasmonics Holography.  

National Technical Information Service (NTIS)

We report experimental, theoretical and simulation results on the development of plasmonic holography by Reconfigurable Surface Plasmon Phase Modulators from micro-electromechanical devices. High dielectric constant nanostructures brought into the vicinit...

B. S. Dennis G. Blumberg M. Haftel

2013-01-01

145

Computing, Information, and Communications Technology (CICT) Program Overview  

NASA Technical Reports Server (NTRS)

The Computing, Information and Communications Technology (CICT) Program's goal is to enable NASA's Scientific Research, Space Exploration, and Aerospace Technology Missions with greater mission assurance, for less cost, with increased science return through the development and use of advanced computing, information and communication technologies

VanDalsem, William R.

2003-01-01

146

Using Type II Computer Network Technology To Reach Distance Students.  

ERIC Educational Resources Information Center

This article, in a series on computer technology and distance education, focuses on "Type II Technology," courses using textbooks and course guides for primary delivery, but enhancing them with computer conferencing as the main vehicle of instructional communication. Discusses technology proficiency, maximizing learning in conferencing…

Eastmond, Dan; Granger, Dan

1998-01-01

147

THE USE OF COMPUTER TECHNOLOGIES IN THE SOCIAL STUDIES CLASSROOM  

Microsoft Academic Search

Nowadays, the use of technology in education has become more popular. Special attention has been given to the adaptation of computer technology into teaching-learning process for effective learning and increasing students' achievement. In recent years, it has been realized that there is an immense benefit in applying computer technology in the social studies classroom. The first purpose of this study

Mehmet Acikalin; Erdinc Duru

2005-01-01

148

Towards full-resolution inline electron holography.  

PubMed

With the availability of fast computers, inline electron holography, a technique for reconstructing both amplitude and phase of the electron wave function as scattered by the sample from a set of differently aberrated transmission electron microscopy images, is becoming increasingly quantitative. While focal series reconstruction from transmission electron microscopy images has already been practiced for at least 3 decades, existing approaches can only recover a relatively small band of spatial frequencies. Here I present a reconstruction scheme which is capable of reconstructing the electron wave function for a very large range of spatial frequencies, demonstrating its performance using simulated as well as experimental data. PMID:24239416

Koch, Christoph T

2014-08-01

149

Attitudes to Technology, Perceived Computer Self-Efficacy and Computer Anxiety as Predictors of Computer Supported Education  

ERIC Educational Resources Information Center

There is a large body of research regarding computer supported education, perceptions of computer self-efficacy, computer anxiety and the technological attitudes of teachers and teacher candidates. However, no study has been conducted on the correlation between and effect of computer supported education, perceived computer self-efficacy, computer

Celik, Vehbi; Yesilyurt, Etem

2013-01-01

150

Computer Graphics. Curriculum Guide for Technology Education.  

ERIC Educational Resources Information Center

This curriculum guide for a 1-quarter or 1-semester course in computer graphics is designed to be used with Apple II computers. Some of the topics covered include the following: computer graphics terminology and applications, operating Apple computers, graphics programming in BASIC using various programs and commands, computer graphics painting,…

Craft, Clyde O.

151

Nearfield Acoustic Holography: Review and Perspectives.  

National Technical Information Service (NTIS)

The development of the Nearfield Acoustic Holography technique (NAH) for planar arrays is reported. A critical review shows that this technique represents an improvement over standard Acoustic Holography (AH) only for reconstructions of sources radiating ...

A. E. Perezmatzumoto F. J. Fahy S. J. Elliott

1989-01-01

152

Application of advanced computational technology to propulsion CFD  

Microsoft Academic Search

The Internal Fluid Mechanics Division of the NASA Lewis Research Center is combining the key elements of computational fluid dynamics, aerothermodynamic experiments, and advanced computational technology to bring internal computational fluid dynamics (ICFM) to a state of practical application for aerospace propulsion system design. This paper presents an overview of efforts underway at NASA Lewis to advance and apply computational

John R. Szuch

1988-01-01

153

Experiencing virtual computing lab in information technology education  

Microsoft Academic Search

Virtual Computing Lab (VCL) is an open source remote access scheduling and image management system developed at North Carolina State University (NCSU). East Carolina University (ECU), partnered with NCSU and IBM to provide innovative centralized remote computer and software access to both faculty and students under the Virtual Computing Initiative. VCL was used in several information and computer technology courses

Peng Li; Lee W. Toderick; Philip J. Lunsford II

2009-01-01

154

Attitudes Toward Computer Technology Between Nursing and Medical Educators  

PubMed Central

The results of this descriptive study indicated no significant difference between nursing and medical educators' attitudes toward computer technology. Demographic variables and usages of computer technology in educational and clinical practice environments were not significant. Previous experience with computer technology was significant but negatively correlated; whereas, education regarding computer technology was not. Word processing and record keeping in the education environment, however, were negatively correlated with attitudes. In the clinical environment, diagnosing was positively correlated, but patient assessment and network systems were negatively correlated with attitudes.

Harsanyi, Bennie E.; Kelsey, Clyde E.

1989-01-01

155

Dynamic holography for high-dynamic-range two-dimensional laser wavefront control  

NASA Astrophysics Data System (ADS)

'Dynamic holography is demonstrated as a technique for high- dynamic-range, multi-function laser wavefront control. In this paper, we describe three variations for hologram generation and display. These include all-optical holography for severe aberration compensation, computer-processed holography for high-optical-efficiency severe aberration compensation and computer-generated holography for multi- function laser wavefront control including dynamic tip, tilt, focus and aberration control. A prototype hologram display system operates with total optical efficiencies up to 93% and with refresh rates on the order of 10 Hz. The prototype system has resolution sufficient to introduce about 200 waves of diffractive wavefront control at 532 nm optical wavelength.'

Gruneisen, Mark T.; Martinez, Ty; Lubin, Donald L.

2002-02-01

156

Petascale Computing Enabling Technologies Project Final Report  

SciTech Connect

The Petascale Computing Enabling Technologies (PCET) project addressed challenges arising from current trends in computer architecture that will lead to large-scale systems with many more nodes, each of which uses multicore chips. These factors will soon lead to systems that have over one million processors. Also, the use of multicore chips will lead to less memory and less memory bandwidth per core. We need fundamentally new algorithmic approaches to cope with these memory constraints and the huge number of processors. Further, correct, efficient code development is difficult even with the number of processors in current systems; more processors will only make it harder. The goal of PCET was to overcome these challenges by developing the computer science and mathematical underpinnings needed to realize the full potential of our future large-scale systems. Our research results will significantly increase the scientific output obtained from LLNL large-scale computing resources by improving application scientist productivity and system utilization. Our successes include scalable mathematical algorithms that adapt to these emerging architecture trends and through code correctness and performance methodologies that automate critical aspects of application development as well as the foundations for application-level fault tolerance techniques. PCET's scope encompassed several research thrusts in computer science and mathematics: code correctness and performance methodologies, scalable mathematics algorithms appropriate for multicore systems, and application-level fault tolerance techniques. Due to funding limitations, we focused primarily on the first three thrusts although our work also lays the foundation for the needed advances in fault tolerance. In the area of scalable mathematics algorithms, our preliminary work established that OpenMP performance of the AMG linear solver benchmark and important individual kernels on Atlas did not match the predictions of our simple initial model. Our investigations demonstrated that a poor default memory allocation mechanism degraded performance. We developed a prototype NUMA library to provide generic mechanisms to overcome these issues, resulting in significantly improved OpenMP performance. After additional testing, we will make this library available to all users, providing a simple means to improve threading on LLNL's production Linux platforms. We also made progress on developing new scalable algorithms that target multicore nodes. We designed and implemented a new AMG interpolation operator with improved convergence properties for very low complexity coarsening schemes. This implementation will also soon be available to LLNL's application teams as part of the hypre library. We presented results for both topics in an invited plenary talk entitled 'Efficient Sparse Linear Solvers for Multi-Core Architectures' at the 2009 HPCMP Institutes Annual Meeting/CREATE Annual All-Hands Meeting. The interpolation work was summarized in a talk entitled 'Improving Interpolation for Aggressive Coarsening' at the 14th Copper Mountain Conference on Multigrid Methods and in a research paper that will appear in Numerical Linear Algebra with Applications. In the area of code correctness, we significantly extended our behavior equivalence class identification mechanism. Specifically, we not only demonstrated it works well at very large scales but we also added the ability to classify MPI tasks not only by function call traces, but also by specific call sites (source code line numbers) being executed by tasks. More importantly, we developed a new technique to determine relative logical execution progress of tasks in the equivalence classes by combining static analysis with our original dynamic approach. We applied this technique to a correctness issue that arose at 4096 tasks during the development of the new AMG interpolation operator discussed above. This scale isat the limit of effectiveness of production tools, but our technique quickly located the erroneous source code, demonstrating the power of

de Supinski, B R

2010-02-14

157

Comparative digital holography.  

PubMed

We described a method for direct holographic comparison of the shape or the deformation of two objects when it is not necessary that both samples be located at the same place. In contrast to the well-known incoherent techniques based on inverse fringe projection, this new approach uses a coherent mask that is imaged onto a sample object that has a microstructure different from that of the master object. The coherent mask is created by digital holography to permit instant access to complete optical information on the master object at any wanted place. Transmission of the digital master holograms to the relevant places can be made with a broadband digital telecommunication network such as the Internet. PMID:18033356

Osten, Wolfgang; Baumbach, Torsten; Jüptner, Werner

2002-01-01

158

Microwave antenna holography  

NASA Technical Reports Server (NTRS)

This microwave holography technique utilizes the Fourier transform relation between the complex far field radiation pattern of an antenna and the complex aperture field distribution. Resulting aperture phase and amplitude distribution data can be used to precisely characterize various crucial performance parameters, including panel alignment, panel shaping, subreflector position, antenna aperture illumination, directivity at various frequencies, and gravity deformation effects. The methodology of data processing presented here was successfully applied to the Deep Space Network (DSN) 34-m beam waveguide antennas. The antenna performance was improved at all operating frequencies by reducing the main reflector mechanical surface rms error to 0.43 mm. At Ka-band (32 GHz), the estimated improvement is 4.1 dB, resulting in an aperture efficiency of 52 percent. The performance improvement was verified by efficiency measurements and additional holographic measurements.

Rochblatt, David J.; Seidel, Boris L.

1992-01-01

159

Cloud Computing. Technology Briefing. Number 1  

ERIC Educational Resources Information Center

Cloud computing is Internet-based computing in which shared resources, software and information are delivered as a service that computers or mobile devices can access on demand. Cloud computing is already used extensively in education. Free or low-cost cloud-based services are used daily by learners and educators to support learning, social…

Alberta Education, 2013

2013-01-01

160

HOLOGRAPHY AND INTERFERENCE PROCESSING OF INFORMATION  

Microsoft Academic Search

Introduction 643 I. Fresnel-transform Holography 644 1. Formulation of Problem (644). 2. The Holography Scheme (645). 3. Read and Virtual Images (646). 4. Bleached Hologram (647). 5. Dynamic Range of Hologram (647). Holographic Microscope (647). 7. Hologram in a Thick Emulsion (648). 8. Color Holography (648). II. Interference Processing of Information 649 1. Spatial Filtering of the Structure of an

L M Soroko

1967-01-01

161

A Computational Technology Approach to Education  

Microsoft Academic Search

As technology is increasingly used in most facets of the workplace, it is imperative that primary and secondary schools and colleges help create a workforce capable of turning technological advancements into societal benefits. Such a workforce should possess strong backgrounds in math, science, and technology, and its numbers should be sustainable. Educators should use technology as the catalyst to transform

Osman Yasar; Jose Maliekal; Leigh J. Little; Dawn Jones

2006-01-01

162

Who Needs a Person Centered Computer Technology.  

National Technical Information Service (NTIS)

Contemporary computer designers are largely machine centered and emphasize function and standards of elegance, efficiency and computing power. The side effects of systems may enhance or diminish the wellbeing of various users. Recent studies of the human ...

R. Kling

1973-01-01

163

Computers--Teaching, Technology, and Applications.  

ERIC Educational Resources Information Center

Includes "Managing Personality Types in the Computer Classroom" (Cocco); "External I/O Input/Output with a PC" (Fryda); "The Future of CAD/CAM Computer-Assisted Design/Computer-Assisted Manufacturing Software" (Fulton); and "Teaching Quality Assurance--A Laboratory Approach" (Wojslaw). (SK)

Cocco, Anthony M.; And Others

1995-01-01

164

The Impact of Computer Technology on the Family.  

ERIC Educational Resources Information Center

Computer technology as it affects home and family life is explored. Elements of this technology which are examined include electronic fund transfers (EFT), consumer rights and responsibilities relating to use of EFT, working at home via computer, housing design, costs of computerizing the home, and computerized aids for the handicapped. (CT)

Bailey, Anne Wiseman

1982-01-01

165

Interactive computer technology for skin cancer prevention targeting children  

Microsoft Academic Search

Background: Computer technology has become an integral part of health care, yet there have been few studies exploring the use of multimedia technology in the prevention of cancer, especially targeting children.Objective: The aims of this study were to develop and evaluate a new multimedia computer program for the primary prevention of skin cancer among a childhood population.Design and Participants: An

Robin L. Hornung; Peter A. Lennon; Joanne M. Garrett; Robert F. DeVellis; Peter D. Weinberg; Victor J. Strecher

2000-01-01

166

Senior Nursing Students Comfort Levels with Computer Technology.  

ERIC Educational Resources Information Center

This paper describes the rationale for investigating the comfort levels in utilizing computer technology by senior level students in a baccalaureate nursing program. Students were surveyed before and after being exposed to various learning activities requiring interaction with computer technology. These structured learning activities included: use…

Draude, Barbara J.; McKinney, Susan H.

167

A proposed new high level abstraction for computer technology  

Microsoft Academic Search

Computer technology can be described using a range of models based on different levels of detail e.g. semiconductors, transistors, digital circuits. Such models are designed to progressively hid irrelevant detail and yet provide sufficient information to be useful for communication, design and documentation. However, developments in computer technology have resulted in a low cost, heterogeneous modular architecture that is difficult

S. P. Maj; D. Veal; R. Duley

2001-01-01

168

Computer Technology, Science Education, and Students with Learning Disabilities  

Microsoft Academic Search

The ways computer technology could be used to teach science to students with learning disabilities (LD) are explored. Science is for all students and that includes students with LD. Learning science has both cognitive and affective implications for students with LD. In this context, computer technology provides cognitively engaging and motivating instructional tools for individualizing the mode of delivery; developing

David Kumar; Cynthia L. Wilson

1997-01-01

169

Information and computer technology use in Australian social work education  

Microsoft Academic Search

Computer technology is now an every day aspect of both our personal and professional lives. Recently however, concern has been raised as to the preparedness of social work students to use this tool effectively when entering the practice setting. This paper sets out to address the issue by investigating the extent and ways in which computer technology is included in

Scheryl Hayhoe; Maureen Dollard

2000-01-01

170

Computer technology as object language: Revisiting office design  

Microsoft Academic Search

Object language is a term that describes the messages that objects convey to people. This paper extends previous research on the object language associated with office design elements such as the placement of one’s desk and office messiness by examining the role of computer technology as an additional form of object language. Computer technology was operationalized in Study 1 in

James C. McElroy; Kevin P. Scheibe; Paula C. Morrow

2007-01-01

171

Digitized holography: spatial 3D imaging of virtual and real objects  

NASA Astrophysics Data System (ADS)

Recent development of computer algorithms and micro fabrication technologies allows us to reconstruct the wave-field of light emitted from a completely virtual 3D scene given by the numerical model. In addition, recent evolution of image sensors and a technique for capturing real object waves makes it possible to digitize the whole process of classical holography. The wave-field of the virtual, real, and hybrid scene are optically reconstructed by the computer holograms fabricated by laser lithography system. The produced spatial 3D images have a wide viewing-zone in full-parallax and give viewers a strong sensation of depth, which never has been caused by conventional 3D systems.

Matsushima, Kyoji; Arima, Yasuaki; Nakahara, Sumio

2011-05-01

172

CICT Computing, Information, and Communications Technology Program  

NASA Technical Reports Server (NTRS)

The CICT Program is part of the NASA Aerospace Technology Enterprise's fundamental technology thrust to develop tools. processes, and technologies that enable new aerospace system capabilities and missions. The CICT Program's four key objectives are: Provide seamless access to NASA resources- including ground-, air-, and space-based distributed information technology resources-so that NASA scientists and engineers can more easily control missions, make new scientific discoveries, and design the next-generation space vehicles, provide high-data delivery from these assets directly to users for missions, develop goal-oriented human-centered systems, and research, develop and evaluate revolutionary technology.

Laufenberg, Lawrence; Tu, Eugene (Technical Monitor)

2002-01-01

173

A perspective on technical needs in computational structures technology  

NASA Technical Reports Server (NTRS)

The wide spectrum of needs and applications are demonstrated of computational structural mechanics. The spectrum ranges from micro structural mechanics to the optimization of the performance of aerovehicles. Critical high leveraged technologies will require engineering process modernization and automation, affordable structures and materials, and advanced computational technology. Recent advances at Rockwell International in computational structural mechanics addressed these issues and improve the ability to achieve advanced aircraft objectives.

Abdi, Frank F.; Savoni, Gregory L.; Newell, Kenneth J.

1992-01-01

174

Application of Computer Technology in Advanced Material Science and Processing  

Microsoft Academic Search

\\u000a Computer technology is an actual system model, which is largely unaffected by experimental conditions, time and space constraints,\\u000a and is of great flexibility. Nowadays, computer technology has thoroughly penetrated in the various areas of material processing\\u000a and research, which becomes one of the important frontiers in the field of material manufacturing industry. At the same time,\\u000a material science and technology are

Yajuan Liu

2010-01-01

175

Computer Science and Information Technology Gateways and Resources  

NSDL National Science Digital Library

The Computer Science and Information Technology Gateways and Resources collection is comprised of web portals, web sites, and resources in many areas including algorithms and data structures, operating systems and programming languages, software engineering, artificial intelligence, information science, digital-library technologies, and others. Here may be found materials for educators and learners, resources intended for the general public, and materials aimed at research communities devoted to computer science and information technology.

2008-03-14

176

Application of computer simulation technology for structure analysis in disaster  

Microsoft Academic Search

With the development of mechanics and computer technology, computer simulation has become an important tool in the structure analysis and design. Especially when the structures are under disaster load such as blast, penetration, impact of collapse or typhoon, it is difficult to analyze with test method, while the advantages of computer simulation method such as safe, efficient and cheap, are

Lu Xinzheng; Yang Ning; Jiang Jianjing

2004-01-01

177

Math Attitudes of Computer Education and Instructional Technology Students  

ERIC Educational Resources Information Center

Computer Education and Instructional Technology (CEIT) Departments train computer teachers to fill gap of computer instructor in all grades of schools in Turkey. Additionally graduates can also work as instructional technologist or software developer. The curriculum of CEIT departments includes mathematics courses. The aim of this study is to…

Tekerek, Mehmet; Yeniterzi, Betul; Ercan, Orhan

2011-01-01

178

Application of advanced computational technology to propulsion CFD  

Microsoft Academic Search

The Internal Fluid Mechanics Division of the NASA Lewis Research Center is combining the key elements of computational fluid dynamics, aerothermodynamic experiments, and advanced computational technology to bring internal computational fluid dynamics (ICFM) to a state of practical application for aerospace propulsion system design. This paper presents an overview of efforts under way at NASA Lewis to advance and apply

J SZUCH

1988-01-01

179

COMPUTER VIRUS EDUCATIONAL SYSTEM USING ANIMATED PEDAGOGICAL AGENT TECHNOLOGY  

Microsoft Academic Search

This paper describes a framework for practical application of interface agent technology as means of solving some persistent problems in educational environments. The system has been developed is called a Computer Virus Educational System Using Animated Pedagogical Agent or CAPA. CAPA will cover range of subjects from learning the basics computer virus to handling and management of computer system in

Zasriati Azla Sabot; Abdul Razak; Iznora Aini Zolkifly; Tan Teik Lew

180

Research on computer technology for undergraduates in mathematics education  

Microsoft Academic Search

Recent developments in computer technology are providing support for undergraduates mathematics teaching with a new learning environment. This paper presents an approach on teaching mathematics in computer environments. The role of computers in mathematics teaching has increased due to the importance of visualization in mathematics teaching. These developments make the accessing of structured information sources much easier. The wide range

Dong Chen; Wenjing Jia; Haiju Wang

2009-01-01

181

Computer Technology Standards of Learning for Virginia's Public Schools  

ERIC Educational Resources Information Center

The Computer/Technology Standards of Learning identify and define the progressive development of essential knowledge and skills necessary for students to access, evaluate, use, and create information using technology. They provide a framework for technology literacy and demonstrate a progression from physical manipulation skills for the use of…

Virginia Department of Education, 2005

2005-01-01

182

Soft computing: the convergence of emerging reasoning technologies  

Microsoft Academic Search

The term Soft Computing (SC) represents the combination of emerging problem-solving technologies such as Fuzzy Logic (FL), Probabilistic Reasoning (PR), Neural Networks (NNs), and Genetic Algorithms (GAs). Each of these technologies provide us with complementary reasoning and searching methods to solve complex, real-world problems. After a brief description of each of these technologies, we will analyze some of their most

Piero P. Bonissone

1997-01-01

183

Holography in small bubble chambers  

SciTech Connect

This chapter reports on an experiment to determine the total charm cross section at different incident momenta using the small, heavy liquid bubble chamber HOBC. Holography in liquid hydrogen is also tested using the holographic lexan bubble chamber HOLEBC with the aim of preparing a future holographic experiment in hydrogen. The high intensity tests show that more than 100 incident tracks per hologram do not cause a dramatic effect on the picture quality. Hydrogen is more favorable than freon as the bubble growth is much slower in hydrogen. An advantage of holography is to have the maximum resolution in the full volume of the bubble chamber, which allows a gain in sensitivity by a factor of 10 compared to classical optics as 100 tracks per hologram look reasonable. Holograms are not more difficult to analyze than classical optics high-resolution pictures. The results show that holography is a very powerful technique which can be used in very high resolution particle physics experiments.

Lecoq, P.

1984-01-01

184

Real-Time Finite-Temperature Holography and its Applications  

NASA Astrophysics Data System (ADS)

This dissertation begins with a brief review of basic concepts of holography (AdS/CFT correspondence, Chapter 1). A complete prescription for computing real-time correlators in strongly-coupled conformal field theories at finite-temperature using holography is proposed and checked, and all scalar real-time 3-point correlators of the relativistic conformal field theory are computed at the tree level of dual gravity theory (Chapter 2). The causal 3-point correlators are found to have a simple structure which can be easily generalized to higher n-point correlators and higher spin operators. Then the same prescription is applied to non-relativistic holography (Chapter 3). All scalar real-time 2-point correlators and time-ordered and causal 3-point correlators of finite-temperature Schrödinger field theory are computed there. In the last two chapters, the prescription for relativistic real-time finite-temperature holography and in particular the causal 3-point correlators derived earlier, are used to study various properties of a strongly-coupled plasma, specifically that of N = 4 supersymmetric Yang-Mills field theory. By computing causal energy-stress tensor 3-point correlators analytically in the hydrodynamic regime and matching them with the holographic result, and through the use of newly developed second order Kubo formulae, all five second order transport coefficients of the relativistic conformal hydrodynamics are systematically and consistently computed (Chapter 4). Jet quenching in a strongly-coupled plasma at finite-temperature and finite-chemical potential is also studied by an analytic computation of causal R-current 3-point correlators in large momentum regime. A more detailed and comprehensive picture than previously known emerges (Chapter 5). The dependence of typical jet stopping distance on its initial energy has an exponent 1/4, rather than the 1/3 which was widely known, and the jet quenching is enhanced by introducing a chemical potential to the system.

Wu, Chaolun

185

Towards a person-centered computer technology  

Microsoft Academic Search

Contemporary computer designers are largely machine centered. They emphasize function and standards of elegance, efficiency and computing power. The side effects of systems may enhance or diminish the well-being of various users. Person-centered standards that promote a sense of competence and autonomy are outlined. The coupling of flexible software with responsive organizations is suggested as a means of enhancing personal

Rob Kling

1973-01-01

186

Cutting Technology Costs with Refurbished Computers  

ERIC Educational Resources Information Center

Many district administrators are finding that they can save money on computers by buying preowned ones instead of new ones. The practice has other benefits as well: It allows districts to give more computers to more students who need them, and it also promotes good environmental practices by keeping the machines out of landfills, where they…

Dessoff, Alan

2010-01-01

187

Dynamic Structures through Microdifferential Holography  

PubMed Central

The principles of microdifferential holography are developed primarily from nonmathematical argument, and the method's capabilities are compared with those of x-ray and optical diffraction. Microdifferential holography is very sensitive to small displacements of strongly scattering elements of a specimen whether or not they can be optically resolved. We present and interpret differential images of electrical activity of neurons and of contractile activity of isolated skeletal fibers. The latter confirm the suggestion of earlier work that the dynamic regions of contracting muscle are organized along myofibrillar segments rather than by sarcomeres. ImagesFIGURE 2FIGURE 3FIGURE 4FIGURE 5FIGURE 6FIGURE 7

Sharnoff, Mark; Brehm, Lawrence P.; Henry, Richard W.

1986-01-01

188

Computers as Cognitive Tools: Learning with Technology, Not from Technology.  

ERIC Educational Resources Information Center

Cognitive tools, computer-based applications normally used as productivity software, can also function as knowledge representation formalisms that require learners to think critically. Databases, spreadsheets, semantic networks, expert systems, and multimedia/hypermedia construction can function as computer-based cognitive tools to expand student…

Jonassen, David H.

1995-01-01

189

Phase-multiplication holography  

SciTech Connect

This disclosure relates generally to nondestructive testing for identifying structural characteristics of an object by scanned holographic techniques using a known source of radiation, such as electromagnetic or acoustical radiation. It is an object of this invention to provide an apparatus and method for synthetic aperture expansion in holographic imaging applications to construct fringe patterns capable of holographic reproduction where aperture restrictions in nondestructive testing applications would conventionally make such imaging techniques impossible. The apparatus and method result in the production of a sharply defined frontal image of structural characteristics which could not otherwise be imaged because they occur either near the surface of the object or are confined by geometry restricting aperture dimensions available for scanning purposes. The depth of the structural characteristic below the surface of the object can also be determined by the reconstruction parameters which produce the sharpest focus. Lateral resolution is established by simulated reduction in the radiation wavelength and may easily be an order of magnitude less than the electromagnetic wavelength in the material or 2 times the standard depth of penetration. Since the phase multiplication technique is performed on the detected data, the penetration depth available due to the longer wavelength signals applied to the test object remains unchanged. The phase multiplication technique can also be applied to low frequency acoustic holography, resulting in a test which combines excellent penetration of difficult materials with high resolution images.

Collins, H.D.; Prince, J.M.; Davis, T.J.

1982-01-25

190

High-Intensity X-Ray Holography: An Approach to High-Resolution Snapshot Imaging of Biological Specimens.  

National Technical Information Service (NTIS)

The crucial physical and technological issues pertaining to the holographic imaging of biological structures with a short-pulse, high-intensity, high-quantum-energy laser were examined. The limitations of x-ray optics are discussed. Alternative holographi...

J. C. Solem

1982-01-01

191

Computer Technology Integration and Student Learning: Barriers and Promise  

NASA Astrophysics Data System (ADS)

Political and institutional support has enabled many institutions of learning to spend millions of dollars to acquire educational computing tools (Ficklen and Muscara, Am Educ 25(3):22-29, 2001) that have not been effectively integrated into the curriculum. While access to educational technology tools has remarkably improved in most schools, there is still concern about instructional integration of computer technology to support student learning. Appropriate integration of computer tools constitutes a major change in people's lives; technology integration is a complex phenomenon that involves understanding teachers' motivations, perceptions, and beliefs about learning and technology (Woodbridge, http://www.techlearning.com/story/showArticle.php?articleID=17701367). Although computer technology has a great potential to reform or even transform education, barriers come in the way of achieving success especially with student learning. This paper presents an overview of technology use in education with a focus on barriers to computer technology integration. Further, this paper provides suggestions to maximize the benefits of learning with computer technology.

Keengwe, Jared; Onchwari, Grace; Wachira, Patrick

2008-12-01

192

Application of advanced computational technology to propulsion CFD  

NASA Technical Reports Server (NTRS)

The Internal Fluid Mechanics Division of the NASA Lewis Research Center is combining the key elements of computational fluid dynamics, aerothermodynamic experiments, and advanced computational technology to bring internal computational fluid dynamics (ICFM) to a state of practical application for aerospace propulsion system design. This paper presents an overview of efforts under way at NASA Lewis to advance and apply computational technology to ICFM. These efforts include the use of modern, software engineering principles for code development, the development of an AI-based user-interface for large codes, the establishment of a high-performance, data communications network to link ICFM researchers and facilities, and the application of parallel processing to speed up computationally intensive and/or time-critical ICFM problems. A multistage compressor flow physics program is cited as an example of efforts to use advanced computational technology to enhance a current NASA Lewis ICFM research program.

Szuch, John R.

1988-01-01

193

The Future of Children: Children and Computer Technology  

NSDL National Science Digital Library

The Future of Children is a publication of The Woodrow Wilson School of Public and International Affairs at Princeton University and The Brookings Institution. The purpose of the site is "to promote effective policies and programs for children" by providing information and research findings. Available from this website is the journal of Children and Computer Technology, which focuses on children's use of computer technology both in school and at home. The articles "summarize the knowledge and research available on how the use of computers affects children's development, whether it increases or decreases the disparities between rich and poor, and whether it can be used effectively to enhance learning." The site describes "promising examples of computer use" and offers recommendations to improve children's access to computers. Other sections include a review of Federal Programs to Increase Children's Access to Educational Technology, a survey on What Children Think About Computers, and a glossary which gives definitions for selected terms and acronyms.

194

Application of advanced computational technology to propulsion CFD  

NASA Technical Reports Server (NTRS)

The Internal Fluid Mechanics Division of the NASA Lewis Research Center is combining the key elements of computational fluid dynamics, aerothermodynamic experiments, and advanced computational technology to bring internal computational fluid dynamics (ICFM) to a state of practical application for aerospace propulsion system design. This paper presents an overview of efforts underway at NASA Lewis to advance and apply computational technology to ICFM. These efforts include the use of modern, software engineering principles for code development, the development of an AI-based user-interface for large codes, the establishment of a high-performance, data communications network to link ICFM researchers and facilities, and the application of parallel processing to speed up computationally intensive and/or time-critical ICFM problems. A multistage compressor flow physics program is cited as an example of efforts to use advanced computational technology to enhance a current NASA Lewis ICFM research program.

Szuch, John R.

1988-01-01

195

Reviews of computing technology: Software overview  

SciTech Connect

The Savannah River Site Computing Architecture states that the site computing environment will be standards-based, data-driven, and workstation-oriented. Larger server systems deliver needed information to users in a client-server relationship. Goals of the Architecture include utilizing computing resources effectively, maintaining a high level of data integrity, developing a robust infrastructure, and storing data in such a way as to promote accessibility and usability. This document describes the current storage environment at Savannah River Site (SRS) and presents some of the problems that will be faced and strategies that are planned over the next few years.

Hartshorn, W.R.; Johnson, A.L.

1994-01-05

196

Military Applications of Cloud Computing Technologies.  

National Technical Information Service (NTIS)

Cloud computing -- remotely hosting network services and data -- is an emerging concept in the business world that enables the use of mobile devices, increases security, and allows more effective information sharing within organizations. Within the last y...

J. D. Powell

2013-01-01

197

Computing [Technology 2000 analysis and forecast  

Microsoft Academic Search

The dawning of this millennium coincides with the start of a new epoch-that of Internet-distributed computing-and, as is typical with epochal changes, the entrenched are being uprooted. A new breed of device-the Internet appliance-is dethroning the PC, which has held sway over the computing industry for the last two decades. Microsoft Inc., the Redmond, Wash., software megalith whose Windows operating

R. Comerford

2000-01-01

198

Embedded Data Processor and Portable Computer Technology testbeds  

NASA Technical Reports Server (NTRS)

Attention is given to current activities in the Embedded Data Processor and Portable Computer Technology testbed configurations that are part of the Advanced Data Systems Architectures Testbed at the Information Sciences Division at NASA Ames Research Center. The Embedded Data Processor Testbed evaluates advanced microprocessors for potential use in mission and payload applications within the Space Station Freedom Program. The Portable Computer Technology (PCT) Testbed integrates and demonstrates advanced portable computing devices and data system architectures. The PCT Testbed uses both commercial and custom-developed devices to demonstrate the feasibility of functional expansion and networking for portable computers in flight missions.

Alena, Richard; Liu, Yuan-Kwei; Goforth, Andre; Fernquist, Alan R.

1993-01-01

199

Computer Technology Training for Prospective Teachers: Computer Attitudes and Perceived Self-Efficacy  

Microsoft Academic Search

To be effective users of computer technologies and be mod-els for students' computer use, teachers must have positive computer attitudes and feel self-efficacious in using them. The computer training that teachers receive through their teacher education program is likely to foster positive com-puter affect, yet the change may require time and develop-ment. This longitudinal study examined prospective teach-ers' changes in

Ying-chen L. Milbrath; Mable B. Kinzie

2000-01-01

200

Anisotropy in Gravity and Holography  

NASA Astrophysics Data System (ADS)

In this thesis, we examine the dynamical structure of Ho?ava-Lifshitz gravity, and investigate its relationship with holography for anisotropic systems. Ho?ava-Lifshitz gravity refers to a broad class of gravitational models that incorporate anisotropy at a fundamental level. The idea behind Ho?ava-Lifshitz gravity is to utilize ideas from the theory of dynamical critical phenomena into gravity to produce a theory of dynamical spacetime that is power-counting renormalizable, and is thus a candidate renormalizable quantum field theory of gravity. One of the most distinctive features of Ho?ava-Lifshitz gravity is that its group of symmetries consists not of the diffeomorphisms of spacetime, but instead of the group of diffeomorphisms that preserve a given foliation by spatial slices. As a result of having a smaller group of symmetries, HL gravity naturally has one more propagating degree of freedom than general relativity. The extra mode presents two possible difficulties with the theory, one relating to consistency, and the second to its viability as a phenomenological model. (1) It may destabilize the theory. (2) Phenomenologically, there are severe constraints on the existence of an extra propagating graviton polarization, as well as strong experimental constraints on the value of a parameter appearing in the dispersion relation of the extra mode. In the first part of this dissertation we show that the extra mode can be eliminated by introducing a new local symmetry which steps in and takes the place of general covariance in the anisotropic context. While the identification of the appropriate symmetry is quite subtle in the full non-linear theory, once the dust settles, the resulting theory has a spectrum which matches that of general relativity in the infrared. This goes a good way toward answering the question of how close Ho?ava-Lifshitz gravity can come to reproducing general relativity in the infrared regime. In the second part of the thesis we pursue the relationship between Ho?ava-Lifshitz gravity and holographic duals for anisotropic systems. A holographic correspondence is one that posits an equivalence between a theory of gravity on a given spacetime background and a field theory living on the "boundary" of that spacetime, which resides at infinite spatial separation from the interior. It is a non-trivial problem how to define this boundary, but in the case of relativistic boundary field theories, there is a well-known definition due to Penrose of the boundary which produces the geometric structure required to make sense of the correspondence. However, the proposed dual geometries to anisotropic quantum field theories have a Penrose boundary that is incompatible with the assumed correspondence. We generalize Penrose's approach, using concepts from Ho?ava-Lifshitz gravity, to spacetimes with anisotropic boundary conditions, thereby arriving at the concept of anisotropic conformal infinity that is compatible with the holographic correspondence in these spacetimes. We then apply this work to understanding the structure of holography for anisotropic systems in more detail. In particular, we examine the structure of divergences of a certain theory of gravity on Lifshitz space. We find, using our construction of anisotropic conformal infinity, that the appropriate geometric structure of the boundary is that of a foliated spacetime with an anisotropic metric complex. We then perform holographic renormalization in these spacetimes, yielding a computation of the divergent part of the effective action, and find that it exhibits precisely the structure of a Ho?ava-Lifshitz action. Moreover, we find that, for dynamical exponent z = 2, the logarithmic divergence gives rise to a conformal anomaly in 2+1 dimensions, whose general form is precisely that of conformal Ho?ava-Lifshitz gravity with detailed balance.

Melby-Thompson, Charles Milton

201

Visualization and holography: real virtuality  

Microsoft Academic Search

This work focuses on the attempt to establish an analogue and contiguity between visualization and holography. The majority of methods for processing and analysis data work in the virtual space with its virtual images and shapes. Scientific visualization is an extraction of the significant information from the data space and its presentation as a visual shapes, applicable to the visual

Sergey V. Matveyev; Stanislav Klimenko

2002-01-01

202

Holography through optically active windows  

Microsoft Academic Search

By using two orthogonally polarized reference beams, holograms can be recorded through stressed windows and the reconstructed virtual image will show no stress pattern. As shown analytically, the stress-pattern-free hologram is recordable for any polarization state of the object illumination. Hence, the more efficient nondepolarizing diffuser can be used in performing holography through stressed windows if two reference beams are

A. J. Decker

1979-01-01

203

Aperture synthesis in digital holography  

Microsoft Academic Search

Resolution and speckle size in the reconstructed wavefields of digital holography depend on the aperture defined by the size of the CCD-array. Here we introduce the concept of synthesizing a larger aperture by recording simultaneously the same scene by at least two CCD-arrays. It is shown that an improvement in resolution can be obtained which corresponds to a virtual aperture

Thomas M. Kreis; Mike Adams; Werner P. Jueptner

2002-01-01

204

A Bibliography of Selected Rand Publications; Computing Technology.  

National Technical Information Service (NTIS)

The bibliography contains 308 abstracts of unclassified Rand studies dealing with various aspects of computing technology. The studies selected have all been issued during the period January 1963 through August 1971. The intention is to revise the bibliog...

1971-01-01

205

Application of IP Multicast Technology in Computer Laboratory Teaching System  

Microsoft Academic Search

The article presents a new way to apply IP multicast technology in computer laboratory teaching, this system can keep the data transmission in a limited area, so as to increase the efficiency of network.

Jing Bi; Kai Song; Hang Li

2009-01-01

206

Assessment of Computer Dispatch Technology in the Paratransit Industry.  

National Technical Information Service (NTIS)

The document explores how computer dispatch technology can improve the efficiency of dispatching shared-ride vehicles on a real time basis. The document investigates the current operating capabilities of such systems, their costs and economic benefits, th...

J. R. Stone G. Gilbert A. Nalevanko

1992-01-01

207

Using Computer Technology To Foster Learning for Understanding.  

ERIC Educational Resources Information Center

Describes how computer technology, specifically the use of a multimedia CD-ROM, was integrated into a microbiology curriculum as part of the transition from focusing on facts to fostering learning for understanding. (Contains 30 references.) (Author/YDS)

Van Melle, Elaine; Tomalty, Lewis

2000-01-01

208

Microwave Holography Helps Improve Performance Of Large Antennas  

NASA Technical Reports Server (NTRS)

Report describes use of microwave holography and related techniques of measurement and computation for diagnostics, analysis, and performance improvement of large microwave reflector antennas over all operating frequencies. Technique based on Fourier-transform relationship between complex far-field radiation pattern of antenna at small angles off boresight axis, and complex electromagnetic antenna aperture field distribution, as function of position, expressed in terms of equivalent surface current density.

Rochblatt, David J.

1993-01-01

209

Computer technologies: Attitudes and self-efficacy across undergraduate disciplines  

Microsoft Academic Search

Computer technologies are important tools for learning, communicating, and retrieving information. For individuals to effectively\\u000a employ these tools, they must feel self-efficacious in using them. For this reason it is important to examine attitudes and\\u000a perceptions of competence that are encouraged by undergraduate educational programs. This paper reports on the factor validation\\u000a of two affective measures related to computer technologies,

Mable B. Kinzie; Marcia A. B. Delcourt; Susan M. Powers

1994-01-01

210

Restricted access processor - An application of computer security technology  

NASA Technical Reports Server (NTRS)

This paper describes a security guard device that is currently being developed by Computer Sciences Corporation (CSC). The methods used to provide assurance that the system meets its security requirements include the system architecture, a system security evaluation, and the application of formal and informal verification techniques. The combination of state-of-the-art technology and the incorporation of new verification procedures results in a demonstration of the feasibility of computer security technology for operational applications.

Mcmahon, E. M.

1985-01-01

211

Computer Technology Integration and Student Learning: Barriers and Promise  

Microsoft Academic Search

Political and institutional support has enabled many institutions of learning to spend millions of dollars to acquire educational\\u000a computing tools (Ficklen and Muscara, Am Educ 25(3):22–29, 2001) that have not been effectively integrated into the curriculum.\\u000a While access to educational technology tools has remarkably improved in most schools, there is still concern about instructional\\u000a integration of computer technology to support

Jared Keengwe; Grace Onchwari; Patrick Wachira

2008-01-01

212

The CESAR computer architecture technology and applications.  

NASA Astrophysics Data System (ADS)

This paper gives a short description of the current version of the system in terms of architecture, programming environment and applications. A section is also included on current work on the next generation computer system based on this architecture, which in full will take advantage of the large performance potential of the system.

Toverud, M.; Andreassen, Ø.

213

Training Students in Adaptive Computer Technology.  

ERIC Educational Resources Information Center

This article discusses the benefits that can be derived from implementing adaptive computer training for visually impaired individuals in a group setting, independent from direct job placement concerns. Three student histories demonstrate the advantages of this approach to students' competence, self-esteem, and awareness of career options. (JDD)

Luxton, K.

1990-01-01

214

REACT: Relevant Educational Applications of Computer Technology. CUES: Computer Utility for Educational Systems.  

ERIC Educational Resources Information Center

The testing and revision phase of REACT (Relevant Educational Applications of Computer Technology) and CUES (Computer Utility for Educational Systems) is summarized. REACT is a training course for teachers and administrators designed to familiarize them with the use of computers for instructional and administrative purposes. REACT course materials…

Otte, Richard

215

Computer Science and Computer Information Technology majors together: Analyzing factors impacting students' success in introductory programming  

Microsoft Academic Search

In 2004 Northern Kentucky University began offering a Bachelor of Science degree in Computer Information Technology. As these new majors began to enroll alongside Computer Science majors in the required and standard Computer Science 1 (CS 1) course, the context of CS 1 shifted. Accordingly, we made curriculum changes to adapt the introductory programming sequence to this new context. These

Maureen Doyle; D. Kasturiratna; B. D. Richardson; S. W. Soled

2009-01-01

216

Advanced sensor-computer technology for urban runoff monitoring  

NASA Astrophysics Data System (ADS)

The paper presents the project team's advanced sensor-computer sphere technology for real-time and continuous monitoring of wastewater runoff at the sewer discharge outfalls along the receiving water. This research significantly enhances and extends the previously proposed novel sensor-computer technology. This advanced technology offers new computation models for an innovative use of the sensor-computer sphere comprising accelerometer, programmable in-situ computer, solar power, and wireless communication for real-time and online monitoring of runoff quantity. This innovation can enable more effective planning and decision-making in civil infrastructure, natural environment protection, and water pollution related emergencies. The paper presents the following: (i) the sensor-computer sphere technology; (ii) a significant enhancement to the previously proposed discrete runoff quantity model of this technology; (iii) a new continuous runoff quantity model. Our comparative study on the two distinct models is presented. Based on this study, the paper further investigates the following: (1) energy-, memory-, and communication-efficient use of the technology for runoff monitoring; (2) possible sensor extensions for runoff quality monitoring.

Yu, Byunggu; Behera, Pradeep K.; Ramirez Rochac, Juan F.

2011-03-01

217

Ultra-realistic imaging: a new beginning for display holography  

NASA Astrophysics Data System (ADS)

Recent improvements in key foundation technologies are set to potentially transform the field of Display Holography. In particular new recording systems, based on recent DPSS and semiconductor lasers combined with novel recording materials and processing, have now demonstrated full-color analogue holograms of both lower noise and higher spectral accuracy. Progress in illumination technology is leading to a further major reduction in display noise and to a significant increase of the clear image depth and brightness of such holograms. So too, recent progress in 1-step Direct-Write Digital Holography (DWDH) now opens the way to the creation of High Virtual Volume Displays (HVV) - large format full-parallax DWDH reflection holograms having fundamentally larger clear image depths. In a certain fashion HVV displays can be thought of as providing a high quality full-color digital equivalent to the large-format laser-illuminated transmission holograms of the sixties and seventies. Back then, the advent of such holograms led to much optimism for display holography in the market. However, problems with laser illumination, their monochromatic analogue nature and image noise are well cited as being responsible for their failure in reality. Is there reason for believing that the latest technology improvements will make the mark this time around? This paper argues that indeed there is.

Bjelkhagen, Hans I.; Brotherton-Ratcliffe, David

2014-02-01

218

"Computer" and "Information and Communication Technology": Students' Culture Specific Interpretations  

ERIC Educational Resources Information Center

Given the use of information and communication technology (ICT) and computer as synonyms in ICT-integration research on the one hand, and the potential problems in doing so on the other, this contribution tries to gain insight in the understanding of the words computer and ICT in different settings. In five different countries (Belgium, Finland,…

Elen, Jan; Clarebout, Geraldine; Sarfo, Frederick Kwaku; Louw, Lambertus Philippus; Poysa-Tarhonen, Johanna; Stassens, Nick

2010-01-01

219

The Computer Industry. High Technology Industries: Profiles and Outlooks.  

ERIC Educational Resources Information Center

A series of meetings was held to assess future problems in United States high technology, particularly in the fields of robotics, computers, semiconductors, and telecommunications. This report, which focuses on the computer industry, includes a profile of this industry and the papers presented by industry speakers during the meetings. The profile…

International Trade Administration (DOC), Washington, DC.

220

Computer Technologies: Attitudes and Self-Efficacy across Undergraduate Disciplines.  

ERIC Educational Resources Information Center

For individuals to use computer tools for learning effectively, they must feel self-efficacious in using them. For this reason, it is important to examine attitudes and perceptions of competence that are encouraged by undergraduate educational programs. The factor validation of two affective measures related to computer technologies is reported.…

Kinzie, Mable B.; And Others

221

Coached, Interactive Computer Simulations: A New Technology for Training.  

ERIC Educational Resources Information Center

This paper provides an overview of a prototype simulation-centered intelligent computer-based training (CBT) system--implemented using expert system technology--which provides: (1) an environment in which trainees can learn and practice complex skills; (2) a computer-based coach or mentor to critique performance, suggest improvements, and provide…

Hummel, Thomas J.

222

Men's and Women's Attitudes toward Computer Technology: A Comparison.  

ERIC Educational Resources Information Center

A survey of 62 business-communication students compared the attitudes of men and women about (1) the value of technology in making users more productive; (2) the impact of computers on people and their work environment; and (3) the relative comfort of men and women when using computers. Results indicated that women were more positive on all three…

Ray, Charles M.; Sormunen, Carolee; Harris, Thomas M.

1999-01-01

223

Technology Transfer and the Early Development of Soviet Computers.  

National Technical Information Service (NTIS)

This study examines the early development of computers in the Soviet Union, as well as the part that technology transfer from the West has played in that development. It outlines the conditions under which the first computers evolved, in both the East and...

D. L. Burghart

1988-01-01

224

Computer-Mediated Technology and Transcultural Counselor Education.  

ERIC Educational Resources Information Center

This manuscript traces the history of computer technologies, their applications in mental health settings, and suggests that transcultural counselor educators engage their students in the design of a case-based computer simulation. The avatar-focused simulation offers an unprecedented environment for experimentation in collaborative learning and…

McFadden, John

2000-01-01

225

Computer-Integrated Manufacturing Technology. Tech Prep Competency Profile.  

ERIC Educational Resources Information Center

This tech prep competency profile for computer-integrated manufacturing technology begins with definitions for four occupations: manufacturing technician, quality technician, mechanical engineering technician, and computer-assisted design/drafting (CADD) technician. A chart lists competencies by unit and indicates whether entire or partial unit is…

Lakeland Tech Prep Consortium, Kirtland, OH.

226

Use of Computer Technology to Help Students with Special Needs  

Microsoft Academic Search

Millions of students across the United States cannot benefit fully from a traditional educational program because they have a disability that impairs their ability to partic- ipate in a typical classroom environment. For these students, computer-based tech- nologies can play an especially important role. Not only can computer technology facilitate a broader range of educational activities to meet a variety

Ted S. Hasselbring; Candyce H. Williams Glaser

2000-01-01

227

Engaging students with community organizations by using computer technology  

Microsoft Academic Search

The engagement of information technology or computer science students in community affairs is a challenge in all institutions of higher learning. This paper proposes a paradigm for civic engagement through community-based learning. With the pervasiveness of computers throughout society, there is a growing demand for diligent IT\\/CS education to satisfy the growing needs of a multiplicity of enterprises. This paper

John D. Fernandez

2004-01-01

228

Organizational Response to the Introduction of New Computer Software Technology.  

National Technical Information Service (NTIS)

Employee productivity is a management issue of fundamental importance for the U.S. Army. Personal computer (PC) technology offers a way to dramatically boost a worker's productivity, but frequently it appears that users do not exploit this technology to i...

B. J. Sliwinski C. E. Kozoll J. H. Spoonamore

1991-01-01

229

Foundations of software technology and theoretical computer science  

Microsoft Academic Search

The papers in this book report on foundations of software technology and theoretical computer science project research results. The authors report on algorithmics: design and analysis of graph, geometric, algebraic and VLSI algorithms; data structures; average analysis; complexity theory; parallel parsing; concurrency; algebraic semantics, event structures; logic programming; algebraic properties, semantics; and software technology: program transformations, algebraic methods. These results

Madhavan

1990-01-01

230

Utilizing CPTOnline to upgrade the computer and information technology curriculum  

Microsoft Academic Search

A common problem for the keepers of computer and information technology curriculums is the blending of e-commerce courses into the core curriculum. Certainly some of the core principles of technology-based programs hold up reasonably well regardless of the environment but the emergence of the Web as a development environment has created both new opportunities and new challenges for educators at

Ed Sullivan

2003-01-01

231

Use of Computer Technology To Help Students with Special Needs.  

ERIC Educational Resources Information Center

Reviews the role of computer technology in promoting the education of children with special needs within regular classrooms, discussing: technologies for students with mild learning and behavioral disorders, speech and language disorders, hearing impairments, visual impairments, and severe physical disabilities. Examines barriers to effective…

Hasselbring, Ted S.; Glaser, Candyce H. Williams

2000-01-01

232

Complexity of Integrating Computer Technologies into Education in Turkey  

ERIC Educational Resources Information Center

Integrating Information and Communication Technologies (ICT) into a centralized education system such as Turkey's depends on its successful design and application, which is an expensive and complex process. The aim of this study was to identify the issues related to integrating computer technologies into a centralized education system. Data were…

Akbaba-Altun, Sadegul

2006-01-01

233

Optical computing - The next frontier for lightwave technology  

NASA Astrophysics Data System (ADS)

Parallel architectures in various categories of multiprocessors are discussed, in addition to the devices needed to support the optical computing architectures. Optics offer the potential for performance enhancements in microcomputer and computational arrays. In most of the neural networks and some of the logic-enhanced momories, a significant percentage of the switching may be performed with optical components. Device technologies for optical computing considered include two-dimensional spatial light modulators, integrated optoelectrics, beam steering arrays, and bistable optical devices.

Neff, John A.

234

Computers and terminals as an aid to international technology transfer  

NASA Technical Reports Server (NTRS)

As technology transfer becomes more popular and proves to be an economical method for companies of all sizes to take advantage of a tremendous amount of new and available technology from sources all over the world, the introduction of computers and terminals into the international technology transfer process is proving to be a successful method for companies to take part in this beneficial approach to new business opportunities.

Sweeney, W. T.

1974-01-01

235

Direct-to-digital holography and holovision  

DOEpatents

Systems and methods for direct-to-digital holography are described. An apparatus includes a laser; a beamsplitter optically coupled to the laser; a reference beam mirror optically coupled to the beamsplitter; an object optically coupled to the beamsplitter, a focusing lens optically coupled to both the reference beam mirror and the object; and a digital recorder optically coupled to the focusing lens. A reference beam is incident upon the reference beam mirror at a non-normal angle, and the reference beam and an object beam are focused by the focusing lens at a focal plane of the digital recorder to form an image. The systems and methods provide advantages in that computer assisted holographic measurements can be made.

Thomas, Clarence E. (Knoxville, TN); Baylor, Larry R. (Knoxville, TN); Hanson, Gregory R. (Clinton, TN); Rasmussen, David A. (Knoxville, TN); Voelkl, Edgar (Oak Ridge, TN); Castracane, James (Albany, NY); Simkulet, Michelle (Latham, NY); Clow, Lawrence (Waterford, NY)

2000-01-01

236

Direct-to-digital holography and holovision  

SciTech Connect

Systems and methods for direct-to-digital holography are described. An apparatus includes a laser; a beamsplitter optically coupled to the laser; a reference beam mirror optically coupled to the beamsplitter; an object optically coupled to the beamsplitter, a focusing lens optically coupled to both the reference beam mirror and the object; and a digital recorder optically coupled to the focusing lens. A reference beam is incident upon the reference beam mirror at a non-normal angle, and the reference beam and an object beam are focused by the focusing lens at a focal plane of the digital recorder to form an image. The systems and methods provide advantages in that computer assisted holographic measurements can be made.

Thomas, C.E.; Baylor, L.R.; Hanson, G.R.; Rasmussen, D.A.; Voelkl, E.; Castracane, J.; Simkulet, M.; Clow, L.

2000-06-20

237

25 CFR 502.7 - Electronic, computer or other technologic aid.  

Code of Federal Regulations, 2013 CFR

... 2013-04-01 false Electronic, computer or other technologic aid. 502.7...THIS CHAPTER § 502.7 Electronic, computer or other technologic aid. (a) Electronic, computer or other technologic aid means any...

2013-04-01

238

Remote metrology by comparative digital holography.  

PubMed

A method for the remote comparison of objects with regard to their shape or response to a load is presented. The method allows interferometric sensitivity for comparing objects with different microstructure. In contrast to the well-known incoherent techniques based on inverse fringe projection this new approach uses the coherent optical wave field of the master object as a mask for the illumination of the sample object. The coherent mask is created by digital holography to allow instant access to the complete optical information of the master object at any place desired. The mask is reconstructed by a spatial light modulator (SLM). The optical reconstruction of digital holograms with SLM technology allows modification of reconstructed wavefronts with respect to improvement of image quality, the skilled introduction of additional information about the object (augmented reality), and the alignment of the master and test object. PMID:16512535

Baumbach, Torsten; Osten, Wolfgang; von Kopylow, Christoph; Jüptner, Werner

2006-02-10

239

Computational Fluid Dynamics Technology for Hypersonic Applications  

NASA Technical Reports Server (NTRS)

Several current challenges in computational fluid dynamics and aerothermodynamics for hypersonic vehicle applications are discussed. Example simulations are presented from code validation and code benchmarking efforts to illustrate capabilities and limitations. Opportunities to advance the state-of-art in algorithms, grid generation and adaptation, and code validation are identified. Highlights of diverse efforts to address these challenges are then discussed. One such effort to re-engineer and synthesize the existing analysis capability in LAURA, VULCAN, and FUN3D will provide context for these discussions. The critical (and evolving) role of agile software engineering practice in the capability enhancement process is also noted.

Gnoffo, Peter A.

2003-01-01

240

Imaging live humans through smoke and flames using far-infrared digital holography.  

PubMed

The ability to see behind flames is a key challenge for the industrial field and particularly for the safety field. Development of new technologies to detect live people through smoke and flames in fire scenes is an extremely desirable goal since it can save human lives. The latest technologies, including equipment adopted by fire departments, use infrared bolometers for infrared digital cameras that allow users to see through smoke. However, such detectors are blinded by flame-emitted radiation. Here we show a completely different approach that makes use of lensless digital holography technology in the infrared range for successful imaging through smoke and flames. Notably, we demonstrate that digital holography with a cw laser allows the recording of dynamic human-size targets. In this work, easy detection of live, moving people is achieved through both smoke and flames, thus demonstrating the capability of digital holography at 10.6 ?m. PMID:23482109

Locatelli, M; Pugliese, E; Paturzo, M; Bianco, V; Finizio, A; Pelagotti, A; Poggi, P; Miccio, L; Meucci, R; Ferraro, P

2013-03-11

241

Multicolor holography: a comparative study  

NASA Astrophysics Data System (ADS)

A multicolor holography study case will be presented with emphasis on color control in different silver-halide materials. It has been systematized in order to compare the results obtained with Agfa 8E 75HD to those with Slavich PFG-01. Some experiments were made and the emulsion was manipulated before exposure to achieve high quality multicolored white light reflection holograms. This work has therefore been developed in order to obtain the various colors in a very well controlled way.

Oliveira, Rosa M.; Bernardo, Luis M.; Pinto, Joao L.

2000-10-01

242

Digital holography at millimetre wavelengths  

Microsoft Academic Search

In this paper, we describe a method for wavefront reconstruction at millimetre wavelengths using off-axis holography, a frequently used image recording technique at visible wavelengths first demonstrated in the 1960’s. Millimetre radiation has been highlighted recently in the imaging of non-conducting materials and objects, which often show significant transparency at these long wavelengths, even though opaque at visible and infrared

Ronan J. Mahon; J. Anthony Murphy; William Lanigan

2006-01-01

243

Multicolor Holography With Phase Shifting  

NASA Technical Reports Server (NTRS)

Prototype apparatus constructed to test feasibility of two-color holographic interferometric scheme in which data for reconstructing holographic wavefront obtained with help of phase-shifting technique. Provides two sets of data needed to solve equations for effects of temperature and concentration. Concept extended to holography at three or more wavelengths to measure three or more phenomena associated with significant variations in index of refraction

Vikram, Chandra S.

1996-01-01

244

Atom interferometers and atom holography  

SciTech Connect

Various techniques of atom manipulation with a binary hologram are discussed and demonstrated experimentally. An atomic beam of metastable neon in the 1s{sub 3} state and a SiN thin film with holes that expresses the transmission function of the hologram are used to demonstrate this technique. The gray-scale holography of atoms is demonstrated for the first time. Other possibilities of holographic manipulation of atoms are also discussed.

Shimizu, Fujio; Mitake, Satoru [Institute for Laser Science and CREST, University of Electro-Communications, Chofu-shi 182-8585 (Japan); Fujita, Jun-ichi [NEC Fundamental Research Laboratories, 34 Miyukigaoka, Tsukuba 305-0841 (Japan); Morinaga, Makoto [Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan); Kishimoto, Tetsuo [Institute for Laser Science and CREST, University of Electro-Communications, Chofu-shi 182-8585 (Japan); Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)

1999-06-11

245

Impact of new computing systems on computational mechanics and flight-vehicle structures technology  

NASA Technical Reports Server (NTRS)

Advances in computer technology which may have an impact on computational mechanics and flight vehicle structures technology were reviewed. The characteristics of supersystems, highly parallel systems, and small systems are summarized. The interrelations of numerical algorithms and software with parallel architectures are discussed. A scenario for future hardware/software environment and engineering analysis systems is presented. Research areas with potential for improving the effectiveness of analysis methods in the new environment are identified.

Noor, A. K.; Storaasli, O. O.; Fulton, R. E.

1984-01-01

246

The change in critical technologies for computational physics  

NASA Technical Reports Server (NTRS)

It is noted that the types of technology required for computational physics are changing as the field matures. Emphasis has shifted from computer technology to algorithm technology and, finally, to visual analysis technology as areas of critical research for this field. High-performance graphical workstations tied to a supercommunicator with high-speed communications along with the development of especially tailored visualization software has enabled analysis of highly complex fluid-dynamics simulations. Particular reference is made here to the development of visual analysis tools at NASA's Numerical Aerodynamics Simulation Facility. The next technology which this field requires is one that would eliminate visual clutter by extracting key features of simulations of physics and technology in order to create displays that clearly portray these key features. Research in the tuning of visual displays to human cognitive abilities is proposed. The immediate transfer of technology to all levels of computers, specifically the inclusion of visualization primitives in basic software developments for all work stations and PCs, is recommended.

Watson, Val

1990-01-01

247

Nearfield acoustic holography: Review and perspectives  

Microsoft Academic Search

The development of the Nearfield Acoustic Holography technique (NAH) for planar arrays is reported. A critical review shows that this technique represents an improvement over standard Acoustic Holography (AH) only for reconstructions of sources radiating at low frequencies. The possible reasons for a bad source reconstruction in NAH are investigated. The sensitive parameters for producing this distortion in a given

A. E. Perezmatzumoto; F. J. Fahy; S. J. Elliott

1989-01-01

248

Monte Carlo method in digital holography  

Microsoft Academic Search

The record of the interference pattern of the object wave and the reference wave is done by the application of high resolution photoplates in holography. After developing the photoplate the reconstruction of the object wave can be realized illuminating the hologram by the reference beam. In digital holography the photographic process is eliminated for the interference patterns are recorded by

Zsolt Papp; Janos Kornis; Balázs Gombkötö

2003-01-01

249

Digital holography by two reference beams  

Microsoft Academic Search

The three-dimensional image formation can be managed by digital holography, where the holograms can be recorded by a CCD camera. As a law resolution of a CCD device, just a small angle between the object beam and the reference beam is allowed. This is the reason why the in-line phase- shifting digital holography is used to avoid the mentioned problem

Zsolt Papp; Janos Kornis

2001-01-01

250

Design of a fault tolerant airborne digital computer. Volume 2: Computational requirements and technology  

NASA Technical Reports Server (NTRS)

This final report summarizes the work on the design of a fault tolerant digital computer for aircraft. Volume 2 is composed of two parts. Part 1 is concerned with the computational requirements associated with an advanced commercial aircraft. Part 2 reviews the technology that will be available for the implementation of the computer in the 1975-1985 period. With regard to the computation task 26 computations have been categorized according to computational load, memory requirements, criticality, permitted down-time, and the need to save data in order to effect a roll-back. The technology part stresses the impact of large scale integration (LSI) on the realization of logic and memory. Also considered was module interconnection possibilities so as to minimize fault propagation.

Ratner, R. S.; Shapiro, E. B.; Zeidler, H. M.; Wahlstrom, S. E.; Clark, C. B.; Goldberg, J.

1973-01-01

251

Magnification of optical image in holography projection using lensless Fresnel holography  

NASA Astrophysics Data System (ADS)

A digital micro-mirror device (DMD) acting as a real-time hologram is an emerging technology in dynamic holographic projection. This paper presents a lensless image magnification method in DMD holography by using a Fresnel hologram. By analyzing the diffraction order distribution in the image plane of a hologram produced by DMD, we find the factors that limit the size of the magnified image. We perform a lensless magnification experiment that shows good magnified images in accordance with the numerical results. Finally, we discuss methods to eliminate longitudinal error and chromatic aberration in three-dimensional (3-D) and color projection, respectively, and present a 3-D image reconstruction result that shows lensless magnification of a 3-D image without distortion. It is believed that this technique can be used in future real-time holographic projection based on digital light processing technology.

Ma, Jianshe; Su, Ping; Xia, Feipeng; Ren, Zhenbo; Liu, Tong

2012-08-01

252

Computer Technology Training for Prospective Teachers: Computer Attitudes and Perceived Self-Efficacy.  

ERIC Educational Resources Information Center

This longitudinal study conducted at the University of Virginia examined preservice teachers' changes in computer anxiety; perceived usefulness of computer technology; frequency of using word processing, email, spreadsheets, database management, statistical packages, and CD-ROM databases; and perceived self-efficacy. Discusses time effect and…

Milbrath, Ying-Chen L.; Kinzie, Mable B.

2000-01-01

253

Computation Directorate and Science& Technology Review Computational Science and Research Featured in 2002  

Microsoft Academic Search

Thank you for your interest in the activities of the Lawrence Livermore National Laboratory Computation Directorate. This collection of articles from the Laboratory's Science & Technology Review highlights the most significant computational projects, achievements, and contributions during 2002. In 2002, LLNL marked the 50th anniversary of its founding. Scientific advancement in support of our national security mission has always been

Alchorn

2003-01-01

254

Real-world applications for brain-computer interface technology  

Microsoft Academic Search

The mission of the Georgia State University BrainLab is to create and adapt methods of human-computer interaction that will allow brain-computer interface (BCI) technologies to effectively control real-world applications. Most of the existing BCI applications were designed largely for training and demonstration purposes. Our goal is to research ways of transitioning BCI control skills learned in training to real-world scenarios.

Melody M. Moore

2003-01-01

255

Managing and directing innovation in the holography business  

NASA Astrophysics Data System (ADS)

The intellectual property (IP) space associated with core high-tech innovations, such as holography, tends to rapidly expand in many directions as new applications and improvements to the core technology are realized. Patents soon start to quickly fill regions of the IP space to varying densities, often before any commercial product is available. Complicating matters is the fact that the patents typically range wildly in quality and business value for a host of reasons, not the least of which is that many high-tech companies lack an IP strategy designed to drive their R and D and patenting efforts. IP-savvy high-tech companies are relying more and more on some type of IP space analysis to more fully understand the IP landscape in which they do business. However, after an IP space analysis is performed, it needs to be integrated into a larger IP management system driven by an IP strategy. This paper examines the role of a best-practice IP management system in a high-tech business and how it can be used in conjunction with a holography IP space analysis to strategically manage and direct innovation in the holography business.

Gortych, Joseph E.; Abilock, Harold

2006-03-01

256

The microwave holography system for the Sardinia Radio Telescope  

NASA Astrophysics Data System (ADS)

Microwave holography is a well-established technique for mapping surface errors of large reflector antennas, particularly those designed to operate at high frequencies. We present here a holography system based on the interferometric method for mapping the primary reflector surface of the Sardinia Radio Telescope (SRT). SRT is a new 64-m-diameter antenna located in Sardinia, Italy, equipped with an active surface and designed to operate up to 115 GHz. The system consists mainly of two radio frequency low-noise coherent channels, designed to receive Ku-band digital TV signals from geostationary satellites. Two commercial prime focus low-noise block converters are installed on the radio telescope under test and on a small reference antenna, respectively. Then the signals are amplified, filtered and downconverted to baseband. An innovative digital back-end based on FPGA technology has been implemented to digitize two 5 MHz-band signals and calculate their cross-correlation in real-time. This is carried out by using a 16-bit resolution ADCs and a FPGA reaching very large amplitude dynamic range and reducing post-processing time. The final holography data analysis is performed by CLIC data reduction software developed within the Institut de Radioastronomie Millimétrique (IRAM, Grenoble, France). The system was successfully tested during several holography measurement campaigns, recently performed at the Medicina 32-m radio telescope. Two 65-by-65 maps, using an on-the-fly raster scan with on-source phase calibration, were performed pointing the radio telescope at 38 degrees elevation towards EUTELSAT 7A satellite. The high SNR (greater than 60 dB) and the good phase stability led to get an accuracy on the surface error maps better than 150 ?m RMS.

Serra, G.; Bolli, P.; Busonera, G.; Pisanu, T.; Poppi, S.; Gaudiomonte, F.; Zacchiroli, G.; Roda, J.; Morsiani, M.; López-Pérez, J. A.

2012-09-01

257

Implications of Computer Technology. Harvard University Program on Technology and Society.  

ERIC Educational Resources Information Center

Lengthy abstracts of a small number of selected books and articles on the implications of computer technology are presented, preceded by a brief state-of-the-art survey which traces the impact of computers on the structure of economic and political organizations and socio-cultural patterns. A summary statement introduces each of the three abstract…

Taviss, Irene; Burbank, Judith

258

The Adoption of Grid Computing Technology by Organizations: A Quantitative Study Using Technology Acceptance Model  

ERIC Educational Resources Information Center

Advances in grid technology have enabled some organizations to harness enormous computational power on demand. However, the prediction of widespread adoption of the grid technology has not materialized despite the obvious grid advantages. This situation has encouraged intense efforts to close the research gap in the grid adoption process. In this…

Udoh, Emmanuel E.

2010-01-01

259

Information Technology in project-organized electronic and computer technology engineering education  

Microsoft Academic Search

This paper describes the integration of IT in the education of electronic and computer technology engineers at Institute of Electronic Systems, Aalborg Uni- versity, Denmark. At the Institute Information Technology is an important tool in the aspects of the education as well as for communication among students and teachers.

Jens Dalsgaard

260

The pedagogy-technology interface in Computer Assisted Pronunciation Training  

Microsoft Academic Search

In this paper, we examine the relationship between pedagogy and technology in Computer Assisted Pronunciation Training (CAPT) courseware. First, we will analyse available literature on second language pronunciation teaching and learning in order to derive some general guidelines for effective training. Second, we will present an appraisal of various CAPT systems with a view to establishing whether they meet pedagogical

Ambra Neri; Catia Cucchiarini; Helmer Strik; L. W. J. Boves

2002-01-01

261

Application of Computer Integration Technology for Fire Safety Analysis  

Microsoft Academic Search

With the development of information technology, the fire safety assessment of whole structure or region based on the computer simulation has become a hot topic. However, traditionally, the concerned studies are performed separately for different objectives and difficult to perform an overall evaluation. A new multi-dimensional integration model and methodology for fire safety assessment were presented and two newly developed

Jianyong Shi; Yinqing Li; Huchuan Chen

2008-01-01

262

COMPUTER MODELING (INDUSTRIAL MULTIMEDIA BRANCH, SUSTAINABLE TECHNOLOGY DIVISION, NRMRL)  

EPA Science Inventory

The Industrial Multimedia Branch of NRMRL's Sustainable Technology Division maintains a research program in modeling of industrial processes for pollution prevention applications. The purpose of this program is to develop computer software tools for the user community to self-ass...

263

NASA CST aids U.S. industry. [computational structures technology  

NASA Technical Reports Server (NTRS)

The effect of NASA's computational structures Technology (CST) research on aerospace vehicle design and operation is discussed. The application of this research to proposed version of a high-speed civil transport, to composite structures in aerospace, to the study of crack growth, and to resolving field problems is addressed.

Housner, Jerry M.; Pinson, Larry D.

1993-01-01

264

Computational Structures Technology for Airframes and Propulsion Systems  

NASA Technical Reports Server (NTRS)

This conference publication contains the presentations and discussions from the joint University of Virginia (UVA)/NASA Workshops. The presentations included NASA Headquarters perspectives on High Speed Civil Transport (HSCT), goals and objectives of the UVA Center for Computational Structures Technology (CST), NASA and Air Force CST activities, CST activities for airframes and propulsion systems in industry, and CST activities at Sandia National Laboratory.

Noor, Ahmed K. (compiler); Housner, Jerrold M. (compiler); Starnes, James H., Jr. (compiler); Hopkins, Dale A. (compiler); Chamis, Christos C. (compiler)

1992-01-01

265

Computer Technology and Student Preferences in a Nutrition Course  

ERIC Educational Resources Information Center

This study assessed learner preferences for using computer-based technology in a distance education course. A questionnaire was posted to students who had taken an undergraduate nutrition course at Athabasca University, Canada. The response rate was 57.1% (176 returned out of 308). Subjects were predominately female (93.7%) and nursing students…

Temple, Norman J.; Kemp, Wendy C.; Benson, Wendy A.

2006-01-01

266

Computer Technologies: Attitudes and Self-Efficacy across Undergraduate Disciplines.  

ERIC Educational Resources Information Center

A study of 359 undergraduate students in business (n=125), education (n=111), and nursing (n=123) in 3 state university systems investigated the use of 2 affective measures concerning aspects of computer technology. Data on construct validity, relationship between results of the two measures, and implications for future research are reported.…

Kinzie, Mable B.; And Others

1994-01-01

267

Implementation of Assistive Computer Technology: A Model for School Systems  

ERIC Educational Resources Information Center

Many researchers conclude that assistive computer technology (ACT) has the potential for improving educational outcomes and improving the quality of life for those with disabilities (Blackhurst & Edyburn, 2000; Fisher & Frey 2001; Lewis, 1993; Lindsey, 1993). While it is recognized that ACT can have a positive impact on learning for students with…

Morrison, Karen

2007-01-01

268

Russian-English Dictionary of Cybernetics and Computer Technology.  

National Technical Information Service (NTIS)

The second edition of the Rand Russian-English Dictionary of Cybernetics and Computer Technology contains over 300 new major entries, making a total of 2050 major entries and about 3300 subentries; each subentry defines a key term as it appears in frequen...

W. B. Holland

1969-01-01

269

Charitable technologies: opportunities for collaborative computing in nonprofit fundraising  

Microsoft Academic Search

This paper presents research analyzing the role of computational technology in the domain of nonprofit fundraising. Nonprofits are a cornerstone of many societies and are especially prominent in the United States, where $295 billion, or slightly more than 2% of the U.S. Gross Domestic Product (i.e. total national revenue), was directed toward charitable causes in 2006. Nonprofits afford many worthwhile

Jeremy Goecks; Amy Voida; Stephen Voida; Elizabeth D. Mynatt

2008-01-01

270

Computer Software for Forestry Technology Curricula. Final Report.  

ERIC Educational Resources Information Center

Since microcomputers are being used more and more frequently in the forest products industry in the Pacific Northwest, Green River Community College conducted a project to search for BASIC language computer programs pertaining to forestry, and when possible, to adapt such software for use in teaching forestry technology. The search for applicable…

Watson, Roy C.; Scobie, Walter R.

271

Using Computer Technology to Foster Learning for Understanding  

Microsoft Academic Search

The literature shows that students typically use either a surface approach to learning, in which the emphasis is on memorization of facts, or a deep approach to learning, in which learning for understanding is the primary focus. This paper describes how computer technology, specifically the use of a multimedia CD-ROM, was integrated into a microbiology curriculum as part of the

Elaine Van Melle; Lewis Tomalty

2000-01-01

272

The Research on Application of Computer Technology in Physics Education  

Microsoft Academic Search

In this paper, we present several examples of using computer technology to make teaching and learning physics more effectively and efficiently. One example is using MATLAB to help students to resolve high-level physics problems, another example is using EXCEL to enhance efficiency of physics experimental data processing, the third example is using ANSYS to simulate physics phenomenon and help students

Yimin Ding; Yihua Song

2010-01-01

273

Preservice Teachers' Computer Literacy: Validation of an Instrument To Measure Self-efficacy for Computer-based Technologies.  

ERIC Educational Resources Information Center

Instruments used in a study by M. B. Kinzie and M. A. Delacourt (1991), the Attitude towards Computer Technologies (ACT) and the Self-efficacy for Computer Technologies (SCT), assess preservice teachers' perceived usefulness of and comfort level with specific computer technologies. This study uses a population confirmed to be similar to that used…

Buhendwa, Frank M.

274

Applications of computer technology to dynamical astronomy. Proceedings. IAU Colloquium No. 109: Applications of computer technology to dynamical astronomy, Gaithersburg, MD (USA), 27 - 29 Jul 1988.  

NASA Astrophysics Data System (ADS)

Contents: 1. Applications of computers to solving problems. 2. Matching problems with technology. 3. New methods of mathematical programming. 4. Matching computer language to the problem. 5. Use of numerical versus algebraic computation. 6. Representation and transmission of results.

Seidelmann, P. K.; Kovalevsky, J.

1988-03-01

275

Nearfield acoustic holography. I - Theory of generalized holography and the development of NAH  

NASA Technical Reports Server (NTRS)

Because its underlying principles are so fundamental, holography has been studied and applied in many areas of science. Recently, a technique has been developed which takes the maximum advantage of the fundamental principles and extracts much more information from a hologram than is customarily associated with such a measurement. In this paper the fundamental principles of holography are reviewed, and a sound radiation measurement system, called nearfield acoustic holography (NAH), which fully exploits the fundamental principles, is described.

Maynard, J. D.; Williams, E. G.; Lee, Y.

1985-01-01

276

Holography through optically active windows  

NASA Technical Reports Server (NTRS)

By using two orthogonally polarized reference beams, holograms can be recorded through stressed windows and the reconstructed virtual image will show no stress pattern. As shown analytically, the stress-pattern-free hologram is recordable for any polarization state of the object illumination. Hence, the more efficient nondepolarizing diffuser can be used in performing holography through stressed windows if two reference beams are used. Results are presented for a pair of machined polysulfone windows intended for use in a holographic flow-visualization setup in a single-stage-compressor test rig.

Decker, A. J.

1979-01-01

277

Holography with standing surface plasma waves  

NASA Technical Reports Server (NTRS)

Holography with standing surface plasma waves, where both reference and object beams propagate in opposite directions, has been investigated using an Al reflection grating coated with evaporated As2S3 layers. The image, which appears only for p-polarization and at certain critical angles, is enhanced by the Lippman-Bragg effect and by an increase in intensity over ordinary holography approximately equal to the absolute value of the real part of the dielectric constant for Al. Also considered is holography with object light alone in photoresist layers, using the beam-splitting properties of the grating.

Cowan, J. J.

1974-01-01

278

Experimental verification of transient nonlinear acoustical holography.  

PubMed

This paper presents an experimental study on nonlinear transient acoustical holography. The validity and effectiveness of a recently proposed nonlinear transient acoustical holography algorithm is evaluated in the presence of noise. The acoustic field measured on a post-focal plane of a high-intensity focused transducer is backward projected to reconstruct the pressure distributions on the focal and a pre-focal plane, which are shown to be in good agreement with the measurement. In contrast, the conventional linear holography produces erroneous results in this case where the nonlinearity involved is strong. Forward acoustic field projection was also carried out to further verify the algorithm. PMID:23654362

Jing, Yun; Cannata, Jonathan; Wang, Tianren

2013-05-01

279

Memory System Technologies for Future High-End Computing Systems  

SciTech Connect

Our ability to solve Grand Challenge Problems in computing hinges on the development of reliable and efficient High-End Computing systems. Unfortunately, the increasing gap between memory and processor speeds remains one of the major bottlenecks in modern architectures. Uniprocessor nodes still suffer, but symmetric multiprocessor nodes--where access to physical memory is shared among all processors--are among the hardest hit. In the latter case, the memory system must juggle multiple working sets and maintain memory coherence, on top of simply responding to access requests. To illustrate the severity of the current situation, consider two important examples: even the high-performance parallel supercomputers in use at Department of Energy National labs observe single-processor utilization rates as low as 5%, and transaction processing commercial workloads see utilizations of at most about 33%. A wealth of research demonstrates that traditional memory systems are incapable of bridging the processor/memory performance gap, and the problem continues to grow. The success of future High-End Computing platforms therefore depends on our developing hardware and software technologies to dramatically relieve the memory bottleneck. In order to take better advantage of the tremendous computing power of modern microprocessors and future High-End systems, we consider it crucial to develop the hardware for intelligent, adaptable memory systems; the middleware and OS modifications to manage them; and the compiler technology and performance tools to exploit them. Taken together, these will provide the foundations for meeting the requirements of future generations of performance-critical, parallel systems based on either uniprocessor or SMP nodes (including PIM organizations). We feel that such solutions should not be vendor-specific, but should be sufficiently general and adaptable such that the technologies could be leveraged by any commercial vendor of High-End Computing systems. This strategy is likely to have the most impact while maintaining modest costs for adoption of the new technologies.

McKee, S A; de Supinski, B R; Mueller, F; Tyson, G S

2003-05-16

280

Measurement techniques and results in broad-band, generalized nearfield acoustical holography  

Microsoft Academic Search

The use of nearfield acoustical holography to study acoustic radiation from vibrating sources is demonstrated. The success of this technique can be attributed to generalization to cylindrical coordinates and extension to broad frequency bands. From the original pressure holograms, it is possible to reconstruct the vector velocity and acoustic intensity; these fields can be computed for any surface exterior to

Karl B. Washburn; Earl G. Williams

1987-01-01

281

Holography-Pipeline: From the wave front generation to an image  

Microsoft Academic Search

Abstract This thesis presents a pure simulation of the whole holography pipeline, from recording the hologram,and reconstructing it over propagating the reconstructed light wave ,in space ,and finally rendering an image from an evaluation ofthe wave function using a virtual camera. Its goal is to investigate the possibilities of using ,holograms ,as flexible representations of 3D objects in computer graphics,

Peter Kaufmann

282

Fluorescence incoherent color holography.  

PubMed

We present a new imaging method to record multicolor digital holograms from objects emitting fluorescent light. The fluorescent light specific to the emission wavelength of various fluorescent dyes after excitation of three dimensional (3D) objects is recorded on a digital monochrome camera after reflection from a diffractive optical element (DOE). For each wavelength of fluorescent emission, the camera sequentially records three holograms reflected from the DOE, each with a different phase factor of the DOE's function. The three holograms are superposed in a computer to create a complex valued Fresnel hologram of each fluorescent emission. The holograms for each fluorescent color are further combined in a computer to produce a multicolored fluorescence hologram and 3D color image. PMID:19532459

Rosen, Joseph; Brooker, Gary

2007-03-01

283

Virtual holography - A method of source and channel encoding and decoding of information  

Microsoft Academic Search

A method called virtual holography is developed both theoretically and experimentally. The method can be summarized briefly as registering the hologram image generated by an optical system. The real hologram, which is the hologram physically generated and contains transformed information, is designed according to the constraints of technology and, therefore, represents channel encoding. The virtual hologram, which is the unregistered

O. Ersoy

1979-01-01

284

Color holography for museums: bringing the artifacts back to the people  

Microsoft Academic Search

Color display holography, which is the most accurate imaging technology known to science, has been used to produce holographic images for display of artifacts in museums. This article presents the 'Bringing the Artifacts back to the people' project. Holograms of twelve different artifacts were recorded using the single-beam Denisyuk color reflection hologram technique. 'White' laser light was produced from three

Hans I. Bjelkhagen; Ardie Osanlou

2011-01-01

285

Computing, information, and communications: Technologies for the 21. Century  

SciTech Connect

To meet the challenges of a radically new and technologically demanding century, the Federal Computing, Information, and Communications (CIC) programs are investing in long-term research and development (R and D) to advance computing, information, and communications in the United States. CIC R and D programs help Federal departments and agencies to fulfill their evolving missions, assure the long-term national security, better understand and manage the physical environment, improve health care, help improve the teaching of children, provide tools for lifelong training and distance learning to the workforce, and sustain critical US economic competitiveness. One of the nine committees of the National Science and Technology Council (NSTC), the Committee on Computing, Information, and Communications (CCIC)--through its CIC R and D Subcommittee--coordinates R and D programs conducted by twelve Federal departments and agencies in cooperation with US academia and industry. These R and D programs are organized into five Program Component Areas: (1) HECC--High End Computing and Computation; (2) LSN--Large Scale Networking, including the Next Generation Internet Initiative; (3) HCS--High Confidence Systems; (4) HuCS--Human Centered Systems; and (5) ETHR--Education, Training, and Human Resources. A brief synopsis of FY 1997 accomplishments and FY 1998 goals by PCA is presented. This report, which supplements the President`s Fiscal Year 1998 Budget, describes the interagency CIC programs.

NONE

1998-11-01

286

Report of the Panel on Computer and Information Technology  

NASA Technical Reports Server (NTRS)

Aircraft have become more and more dependent on computers (information processing) for improved performance and safety. It is clear that this activity will grow, since information processing technology has advanced by a factor of 10 every 5 years for the past 35 years and will continue to do so. Breakthroughs in device technology, from vacuum tubes through transistors to integrated circuits, contribute to this rapid pace. This progress is nearly matched by similar, though not as dramatic, advances in numerical software and algorithms. Progress has not been easy. Many technical and nontechnical challenges were surmounted. The outlook is for continued growth in capability but will require surmounting new challenges. The technology forecast presented in this report has been developed by extrapolating current trends and assessing the possibilities of several high-risk research topics. In the process, critical problem areas that require research and development emphasis have been identified. The outlook assumes a positive perspective; the projected capabilities are possible by the year 2000, and adequate resources will be made available to achieve them. Computer and information technology forecasts and the potential impacts of this technology on aeronautics are identified. Critical issues and technical challenges underlying the achievement of forecasted performance and benefits are addressed.

Lundstrom, Stephen F.; Larsen, Ronald L.

1984-01-01

287

Establishment of the Center for Biomedical Technology Innovation  

SciTech Connect

The report discussed the following topics: (1) Orthopedic Devices; (2) Hybrid Vector and Method Resulting in Protein Overproduction by Eukaryotic Cells; (3) Surgical Simulator; (4) CBTI (Center for Biomedical Technology Innovation) as an Incubator for Start-up Companies; (5) Voice-activated, computer-assisted surgical robotics; (6) Through transmission ultrasonic 3-D holography for diagnostic imaging; (7) CBTI's Scibermed{trademark} Virtual Institute (SVI); and (8) Laser Oxygenation Tomography.

NONE

2001-12-15

288

Accelerating technology development through integrated computation and experimentation  

SciTech Connect

This special section of Energy & Fuels comprises a selection of papers presented at the topical conference “Accelerating Technology Development through Integrated Computation and Experimentation”, sponsored and organized by the United States Department of Energy’s National Energy Technology Laboratory (NETL) as part of the 2012 American Institute of Chemical Engineers (AIChE) Annual Meeting held in Pittsburgh, PA, Oct 28?Nov 2, 2012. That topical conference focused on the latest research and development efforts in five main areas related to fossil energy, with each area focusing on the utilization of both experimental and computational approaches: (1) gas separations (membranes, sorbents, and solvents for CO{sub 2}, H{sub 2}, and O{sub 2} production), (2) CO{sub 2} utilization (enhanced oil recovery, chemical production, mineralization, etc.), (3) carbon sequestration (flow in natural systems), (4) advanced power cycles (oxy-combustion, chemical looping, gasification, etc.), and (5) fuel processing (H{sub 2} production for fuel cells).

Shekhawat, Dushyant [U.S. DOE; Srivastava, Rameshwar [Key Logic

2013-01-01

289

Computer technology and student preferences in a nutrition course  

Microsoft Academic Search

This study assessed learner preferences for using computer?based technology in a distance education course. A questionnaire was posted to students who had taken an undergraduate nutrition course at Athabasca University, Canada. The response rate was 57.1% (176 returned out of 308). Subjects were predominately female (93.7%) and nursing students (61.7%). Most students favoured having a web page with frequently asked

Norman J. Temple; Wendy C. Kemp; Wendy A. Benson

2006-01-01

290

Energy and technology review  

SciTech Connect

This issue of Energy and Technology Review contains: Neutron Penumbral Imaging of Laser-Fusion Targets--using our new penumbral-imaging diagnostic, we have obtained the first images that can be used to measure directly the deuterium-tritium burn region in laser-driven fusion targets; Computed Tomography for Nondestructive Evaluation--various computed tomography systems and computational techniques are used in nondestructive evaluation; Three-Dimensional Image Analysis for Studying Nuclear Chromatin Structure--we have developed an optic-electronic system for acquiring cross-sectional views of cell nuclei, and computer codes to analyze these images and reconstruct the three-dimensional structures they represent; Imaging in the Nuclear Test Program--advanced techniques produce images of unprecedented detail and resolution from Nevada Test Site data; and Computational X-Ray Holography--visible-light experiments and numerically simulated holograms test our ideas about an x-ray microscope for biological research.

Poggio, A.J. (ed.)

1988-10-01

291

Entangled States, Holography, and Quantum Surfaces.  

National Technical Information Service (NTIS)

Starting with an elementary discussion of quantum holography, we show that entangled quantum states of qubits provide a 'local' representation of the global geometry and topology of quantum Riemann surfaces. This representation may play an important role ...

G. F. Chapline

2003-01-01

292

Conoscopic holography: two-dimensional numerical reconstructions.  

PubMed

Conoscopic holography is an incoherent light holographic technique based on the properties of crystal optics. We present experimental results of the numerical reconstruction of a two-dimensional object from its conoscopic hologram. PMID:19798352

Mugnier, L M; Sirat, G Y; Charlot, D

1993-01-01

293

Holography: The Nondestructive Testing of Composite Structures.  

National Technical Information Service (NTIS)

Industrial applications of holography are discussed. The principle of nondestructive testing by laser holographic interferometry, and the parts to be tested (parts of motor case in composite materials) are described. The test facility, which involves a co...

P. Barbier C. Lefloch

1986-01-01

294

Holography as a Liberal Arts Physics Course  

ERIC Educational Resources Information Center

Describes a liberal arts physics course for all majors interested in holography or to satisfy the general education requirements. An outline of the course and some experience of offering it are given. (Author/GA)

Huang, Jacob Wen-kuang

1978-01-01

295

Holography: Art in an Ephemeral Medium.  

ERIC Educational Resources Information Center

The science of holography provides an opportunity to see reality by illusion using laser light, lenses, and mirrors. To develop as holographic artists, students must first gain proficiency in using its techniques, equipment, and materials. (Author/CMV)

Buterbaugh, James G.

1979-01-01

296

Integral holography: white-light single-shot hologram acquisition  

NASA Astrophysics Data System (ADS)

A new method for obtaining digital Fourier holograms, under spatially incoherent white-light illumination and in a single camera shot, is presented. Multiple projections of the 3-D scene are created in the image plane of a microlens array, and a digital camera acquires the entire projections in a single shot. Then, each projection is computer processed to yield a single point in a Fourier hologram. The new method, designated as integral holography, is proved for the general case and demonstrated experimentally for a simple case.

Shaked, Natan T.; Rosen, Joseph; Stern, Adrian

2007-04-01

297

Integral holography: white-light single-shot hologram acquisition.  

PubMed

A new method for obtaining digital Fourier holograms, under spatially incoherent white-light illumination and in a single camera shot, is presented. Multiple projections of the 3-D scene are created in the image plane of a microlens array, and a digital camera acquires the entire projections in a single shot. Then, each projection is computer processed to yield a single point in a Fourier hologram. The new method, designated as integral holography, is proved for the general case and demonstrated experimentally for a simple case. PMID:19532833

Shaked, Natan T; Rosen, Joseph; Stern, Adrian

2007-04-30

298

Hard x-ray imaging holography and tomography  

NASA Astrophysics Data System (ADS)

Phase-contrast microtomography with imaging holographic microscope has been developed. The imaging holography optics consists of X-ray microscope with Fresnel zone plate objective and wavefront-dividing interferometer with total-reflection mirror. One half of incident beam is used to illuminate the object, and the other half is used as the reference wave. Hologram of the magnified image is generated at the image plane of microscope by the interference with reference wave. Phase-contrast tomography can be carried out, by combining holographic wave-front reconstruction with conventional computed-tomography technique. Preliminary results with test specimens are shown.

Suzuki, Yoshio; Takeuchi, Akihisa; Uesugi, Kentaro

2009-09-01

299

Virtual holography in diagnosis and therapy of sensorimotor disturbances.  

PubMed

It has been shown that VR techniques can be usefully applied in the field of sensorimotor disturbances. Virtual scenarios can be created in which patients perform specific motor tasks. Using an optoelectronic position tracking system for motion recording as well as for interaction with virtual objects, and using Virtual Holography as an adequate visualization technique, we are now developing and testing suitable scenarios. Furthermore, an advanced visualization and animation tool using VR technology for diagnosis purpose and therapy planning has been developed, which the physician can profit from during motion analysis. PMID:10163749

Kuhlen, T; Kraiss, K F; Szymanski, A; Dohle, C; Hefter, H; Freund, H J

1996-01-01

300

Image enhancement by holography.  

NASA Technical Reports Server (NTRS)

The speed of the holographic image deblurring method has recently been further enhanced by a new speed in the realization of the powerful holographic image-deblurring filter. The filter makes it possible to carry out the deblurring, in the optical computer used, in times of the order of one second. The experimental achievements using the holographic image-enhancement method are illustrated with examples ranging from out-of-focus or motion-blurred photographs, including 'amateur' photos recorded on Polaroid film, to the sharpening of the best available electron micrographs of viruses. Images recorded with X-rays, notably from rocket-borne photos of the sun, and out-of-focus photographs from cameras in NASA satellites have been similarly deblurred.

Stroke, G. W.

1973-01-01

301

Campus Computing, 1998. The Ninth National Survey of Desktop Computing and Information Technology in American Higher Education.  

ERIC Educational Resources Information Center

This report presents findings of a June 1998 survey of computing officials at 1,623 two- and four-year U.S. colleges and universities concerning the use of computer technology. The survey found that computing and information technology (IT) are now core components of the campus environment and classroom experience. However, key aspects of IT…

Green, Kenneth C.

302

Computer Assisted Naval Applications of Holography.  

National Technical Information Service (NTIS)

Two systems found in an earlier study to possess potential in naval operational applications were analyzed in greater depth to assess their capabilities and limitations. An underwater acoustic holographic imaging system and an aircraft carrier holographic...

N. H. Farhat J. Bordogna W. R. Guard S. A. Musa W. E. Wallace

1971-01-01

303

Computer technology to evaluate body composition, nutrition, and exercise.  

PubMed

The use of computer technology has made it possible to make accurate determinations of body composition, nutrition, and exercise. With the FITCOMP computer assessment system, detailed measurements of physique status have been made on a variety of world-class athletes, including professional football and baseball players, as well as on diverse groups of young and older men and women throughout the United States. The FITCOMP measurement system allows the user a choice of measurement techniques: fatfolds, girths, bone diameters, and hydrostatic weighing. Combined with body composition assessment is a nutrition and exercise plan. The nutrition plan is based on guidelines formulated by the American Dietetic Association. This application of computer technology is unique, because individuals can select the foods they will eat from a list of preferred choices from the basic food groups. Individual menu plans for breakfast, lunch, and dinner are generated to provide an optimal blend of nutrients aimed at achieving ideal body mass and fat percentage. This is coupled with an aerobic exercise program that is selected by the individual from nine different forms, including walking, jogging, running, swimming, cycling, and various sport activities. The caloric output is designed to reduce total body fat through reductions in body weight of 1.4 to 2.5 pounds per week, depending on the exercise selected and total weight loss necessary to achieve a weight goal (and ideal fat percentage). The aerobic exercise plan is based on the method of overload, where intensity and duration are periodically increased dependent on individual capabilities. The use of fitness-oriented computer technology makes it possible to prepare detailed reports about current status and progress as well as to systematize record keeping. PMID:6657627

Katch, F I; Katch, V L

1983-09-01

304

Digital in-line holography of microspheres  

NASA Astrophysics Data System (ADS)

We have used digital in-line holography (DIH) with numerical reconstruction to image micrometer-sized latex spheres as well as ferrimagnetic beads suspended in gelatin. We have examined in detail theoretically and experimentally the conditions necessary to achieve submicrometer resolution of holographic reconstructions. We found that both transparent and opaque particles could be imaged with a resolution that was limited only by the wavelength of the light used. Simple inspection of intensity profiles through a particle allowed an estimate to be made of the particle's three position coordinates within an accuracy of a few hundred nanometers. When the derivative of a second-order polynomial fitted to the intensity profiles was taken, the X, Y, Z position coordinates of particles could be determined within plus-or-minus50 nm. More-accurate positional resolution should be possible with the help of more-advanced computer averaging techniques. Because a single hologram can give information about a large collection of distributed particles, DIH offers the prospect of a powerful new tool for three-dimensional tracking of particles.

Xu, W.; Jericho, M. H.; Meinertzhagen, I. A.; Kreuzer, H. J.

2002-09-01

305

Bulk curves from boundary data in holography  

NASA Astrophysics Data System (ADS)

We embed spherical Rindler space—a geometry with a spherical hole in its center—in asymptotically anti- de Sitter (AdS) spacetime and show that it carries a gravitational entropy proportional to the area of the hole. Spherical AdS-Rindler space is holographically dual to an ultraviolet sector of the boundary field theory given by restriction to a strip of finite duration in time. Because measurements have finite durations, local observers in the field theory can only access information about bounded spatial regions. We propose a notion of differential entropy that captures uncertainty about the state of a system left by the collection of local, finite-time observables. For two-dimensional conformal field theories we use holography and the strong subadditivity of entanglement to propose a formula for differential entropy and show that it precisely reproduces the areas of circular holes in AdS3. Extending the notion to field theories on strips with variable durations in time, we show more generally that differential entropy computes the areas of all closed, inhomogeneous curves on a spatial slice of AdS3. We discuss the extension to higher-dimensional field theories, the relation of differential entropy to entanglement between scales, and some implications for the emergence of space from the renormalization group flow of entangled field theories.

Balasubramanian, Vijay; Chowdhury, Borun D.; Czech, Bart?omiej; de Boer, Jan; Heller, Michal P.

2014-04-01

306

Scientific Applications: Computer synthesis of Holograms for 3-D display  

Microsoft Academic Search

Optical and digital holography are reviewed. The mathematical model and computational techniques of the authors' digital holographic process are discussed, and applications of computer holography are suggested.Computer holograms have been made of three-dimensional objects which give faithful reconstructions, even in white light. A new approach based on point apertures for the image is discussed. Photographs of the images reconstructed from

L. B. Lesem; P. M. Hirsch; J. A. Jordan Jr.

1968-01-01

307

Micro-optical elements in holography  

NASA Astrophysics Data System (ADS)

Modern optical instrumentation increasingly requires miniaturization of the devices used, as is the case, e.g., in the field of endoscopy. The combination of such technology with holography offers advantages such as 3-D documentation and display with the possibility of large magnification a posteriori as well as metrology in form of holographic interferometry of objects with difficult optical access. Miniaturized holographic instrumentation requires small illumination and imaging systems, as well as minute recoding devices. As could be demonstrated, these requirements can be met by introduction of micro-optical elements. The use of (single-mode) optical fibers offers easy handling and flexibility. In particular, new single-mode imaging fiber bundles show improved performance data (high lateral resolution, low speckle noise, and low mode interaction) at submillimeter diameters. Assembled gradient- index rod lenses commonly are used for submillimeter imaging systems. In holographic endoscopy, speckle noise caused by these small limiting apertures can be reduced by using such a gradient-index imaging system simultaneously for both imaging and illumination. The use of electro-optical crystals opens the possibility of developing a minute holographic storage device for in-site recording, reconstruction, and erasure with fast repetition rate.

von Bally, Gert; Dirksen, D.; Zou, Yunlu

1991-09-01

308

Spatial 3D imaging by synthetic and digitized holography  

Microsoft Academic Search

A novel method named digitized holography is proposed for 3D display systems. This is the technique replacing the whole process of classical holography with digital processing of optical wave-fields. The digitized holography allows us to edit holograms and reconstruct spatial 3D images including real-existent objects and CG-modeled virtual objects. Index Terms—Holography, Digital recording, Optical imaging

Yasuaki Arima; Kyoji Matsushima; Sumio Nakahara

2011-01-01

309

Computational fluid dynamics for propulsion technology: Geometric grid visualization in CFD-based propulsion technology research  

NASA Technical Reports Server (NTRS)

The coordination is examined of necessary resources, facilities, and special personnel to provide technical integration activities in the area of computational fluid dynamics applied to propulsion technology. Involved is the coordination of CFD activities between government, industry, and universities. Current geometry modeling, grid generation, and graphical methods are established to use in the analysis of CFD design methodologies.

Ziebarth, John P.; Meyer, Doug

1992-01-01

310

Foreign and Domestic Accomplishments in Magnetic Bubble Device Technology. Computer Science & Technology.  

ERIC Educational Resources Information Center

This document assesses the status of magnetic bubble technology as displayed by non-U.S. research and manufacturing facilities. Non-U.S. research and U.S. accomplishments are described while both technical and economic factors are addressed. Magnetic bubble devices are discussed whenever their application could impact future computer system…

Warnar, Robert B. J.; Calomeris, Peter J.

311

Development of superconductor electronics technology for high-end computing  

NASA Astrophysics Data System (ADS)

This paper describes our programme to develop and demonstrate ultra-high performance single flux quantum (SFQ) VLSI technology that will enable superconducting digital processors for petaFLOPS-scale computing. In the hybrid technology, multi-threaded architecture, the computational engine to power a petaFLOPS machine at affordable power will consist of 4096 SFQ multi-chip processors, with 50 to 100 GHz clock frequency and associated cryogenic RAM. We present the superconducting technology requirements, progress to date and our plan to meet these requirements. We improved SFQ Nb VLSI by two generations, to a 8 kA cm-2, 1.25 µm junction process, incorporated new CAD tools into our methodology, demonstrated methods for recycling the bias current and data communication at speeds up to 60 Gb s-1, both on and between chips through passive transmission lines. FLUX-1 is the most ambitious project implemented in SFQ technology to date, a prototype general-purpose 8 bit microprocessor chip. We are testing the FLUX-1 chip (5K gates, 20 GHz clock) and designing a 32 bit floating-point SFQ multiplier with vector-register memory. We report correct operation of the complete stripline-connected gate library with large bias margins, as well as several larger functional units used in FLUX-1. The next stage will be an SFQ multi-processor machine. Important challenges include further reducing chip supply current and on-chip power dissipation, developing at least 64 kbit, sub-nanosecond cryogenic RAM chips, developing thermally and electrically efficient high data rate cryogenic-to-ambient input/output technology and improving Nb VLSI to increase gate density.

Silver, A.; Kleinsasser, A.; Kerber, G.; Herr, Q.; Dorojevets, M.; Bunyk, P.; Abelson, L.

2003-12-01

312

Use of Soft Computing Technologies For Rocket Engine Control  

NASA Technical Reports Server (NTRS)

The problem to be addressed in this paper is to explore how the use of Soft Computing Technologies (SCT) could be employed to further improve overall engine system reliability and performance. Specifically, this will be presented by enhancing rocket engine control and engine health management (EHM) using SCT coupled with conventional control technologies, and sound software engineering practices used in Marshall s Flight Software Group. The principle goals are to improve software management, software development time and maintenance, processor execution, fault tolerance and mitigation, and nonlinear control in power level transitions. The intent is not to discuss any shortcomings of existing engine control and EHM methodologies, but to provide alternative design choices for control, EHM, implementation, performance, and sustaining engineering. The approaches outlined in this paper will require knowledge in the fields of rocket engine propulsion, software engineering for embedded systems, and soft computing technologies (i.e., neural networks, fuzzy logic, and Bayesian belief networks), much of which is presented in this paper. The first targeted demonstration rocket engine platform is the MC-1 (formerly FASTRAC Engine) which is simulated with hardware and software in the Marshall Avionics & Software Testbed laboratory that

Trevino, Luis C.; Olcmen, Semih; Polites, Michael

2003-01-01

313

Autofocusing in optical scanning holography.  

PubMed

We present autofocusing in optical scanning holography (OSH) with experimental results. We first record the complex hologram of an object using OSH and then create the Fresnel zone plate (FZP) that codes the object constant within the depth range of the object using Gaussian low-pass filtering. We subsequently synthesize a real-only spectrum hologram in which its phase term contains information about a distance parameter. Finally, we extract the distance parameter from the real-only spectrum hologram using fringe-adjusted filtering and the Wigner distribution. Using the extracted distance parameter, we reconstruct a three-dimensional image of the object from the complex hologram using digital convolution, which bypasses the conventional blind convolution to reconstruct a hologram. To the best of our knowledge, this is the first report with experimental results that autofocusing in OSH is possible without any searching algorithm or tracking process. PMID:19956285

Kim, Taegeun; Poon, Ting-Chung

2009-12-01

314

Visualizing Breath using Digital Holography  

NASA Astrophysics Data System (ADS)

Artist Jayne Wilton and physicists Peter Hobson and Ivan Reid of Brunel University are collaborating at Brunel University on a project which aims to use a range of techniques to make visible the normally invisible dynamics of the breath and the verbal and non-verbal communication it facilitates. The breath is a source of a wide range of chemical, auditory and physical exchanges with the direct environment. Digital Holography is being investigated to enable a visually stimulating articulation of the physical trajectory of the breath as it leaves the mouth. Initial findings of this research are presented. Real time digital hologram replay allows the audience to move through holographs of breath-born particles.

Hobson, P. R.; Reid, I. D.; Wilton, J. B.

2013-02-01

315

Photoelectron holography of platinum (111)  

SciTech Connect

Platinum atoms near a (111) single-crystal face have been imaged using photoelectron holography. Electron angular intensity patterns were collected at equally spaced wavenumbers from 6 to 12{Angstrom}{sup {minus}1}. Images of atoms near expected atomic positions are obtained from single-wavenumber analyses over the range of the data set. Positions are detected further from the emitter than we have seen previously, and symmetry assumptions are not required. We have also adopted a three dimensional means of representing the data in order to help understand the results. Twin image suppression and artifact reduction in the holographically reconstructed data are set are obtained when images at different wavenumbers are correctly phase-summed. We are assessing the capability of the technique for rendering true three-dimensional structural information for unknown systems.

Petersen, B.L. [Lawrence Berkeley Lab., CA (United States); Terminello, L.J. [Lawrence Livermore National Lab., CA (United States); Barton, J.J. [International Business Machines Corp., Yorktown Heights, NY (United States). Thomas J. Watson Research Center; Shirley, D.A. [Pennsylvania State Univ., University Park, PA (United States)

1993-04-01

316

Depth-filtered digital holography.  

PubMed

We introduce depth-filtered digital holography (DFDH) as a method for quantitative tomographic phase imaging of buried layers in multilayer samples. The procedure is based on the acquisition of multiple holograms for different wavelengths. Analyzing the intensity over wavelength pixel wise and using an inverse Fourier transform leads to a depth-profile of the multilayered sample. Applying a windowed Fourier transform with a narrow window, we choose a depth-of interest (DOI) which is used to synthesize filtered interference patterns that just contain information of this limited depth. We use the angular spectrum method to introduce an additional spatial filtering and to reconstruct the corresponding holograms. After a short theoretical framework we show experimental proof-of-principle results for the method. PMID:23037413

Koukourakis, Nektarios; Jaedicke, Volker; Adinda-Ougba, Adamou; Goebel, Sebastian; Wiethoff, Helge; Höpfner, Henning; Gerhardt, Nils C; Hofmann, Martin R

2012-09-24

317

Digital holography-based steganography.  

PubMed

A steganographic method offering a high hiding capacity is presented in which the techniques of digital holography are used to distribute information from a small secret image across the larger pixel field of a cover image. An iterative algorithm is used to design a phase-only or complex hologram from a padded version of the secret image, quantizing this data according to the carrier data bits that are available within the intended cover image. By introducing the hologram data only into low-order bits of larger amplitude cover pixels, the change in the cover image remains imperceptible to the casual observer, with a peak signal-to-noise ratio of >40 dB. PMID:21165128

Hamam, Habib

2010-12-15

318

Acoustic emission linear pulse holography  

DOEpatents

This device relates to the concept of and means for performing Acoustic Emission Linear Pulse Holography, which combines the advantages of linear holographic imaging and Acoustic Emission into a single non-destructive inspection system. This unique system produces a chronological, linear holographic image of a flaw by utilizing the acoustic energy emitted during crack growth. The innovation is the concept of utilizing the crack-generated acoustic emission energy to generate a chronological series of images of a growing crack by applying linear, pulse holographic processing to the acoustic emission data. The process is implemented by placing on a structure an array of piezoelectric sensors (typically 16 or 32 of them) near the defect location. A reference sensor is placed between the defect and the array.

Collins, H.D.; Busse, L.J.; Lemon, D.K.

1983-10-25

319

Reviews of Topical Problems: Holography and Interference Processing of Information  

Microsoft Academic Search

Introduction 643 I. Fresnel-transform Holography 644 1. Formulation of Problem (644). 2. The Holography Scheme (645). 3. Read and Virtual Images (646). 4. Bleached Hologram (647). 5. Dynamic Range of Hologram (647). Holographic Microscope (647). 7. Hologram in a Thick Emulsion (648). 8. Color Holography (648). II. Interference Processing of Information 649 1. Spatial Filtering of the Structure of an

L. M. Soroko

1967-01-01

320

Integrating Computer Technology in Classrooms: Teacher Concerns When Implementing an Integrated Learning System.  

ERIC Educational Resources Information Center

Schools cannot expect to obtain gains in learner achievement from computer technology if it is not properly implemented. The concerns of teachers in integrating computer technology in the classroom may impact how computer technology is ultimately implemented. This study examined the concerns of elementary school teachers implementing…

Mills, Steven C.

321

Ultra wide band 3-D cross section (RCS) holography  

SciTech Connect

Ultra wide band impulse holography is an exciting new concept for predictive radar cross section (RCS) evaluation employing near-field measurements. Reconstruction of the near-field hologram data maps the target's scattering areas, and uniquely identifies the hot spot'' locations on the target. In addition, the target and calibration sphere's plane wave angular spectrums are computed (via digital algorithm) and used to generate the target's far-field RCS values in three dimensions for each frequency component in the impulse. Thin and thick targets are defined in terms of their near-field amplitude variations in range. Range gating and computer holographic techniques are applied to correct these variations. Preliminary experimental results on various targets verify the concept of RCS holography. The unique 3-D presentation (i.e., typically containing 524,288 RCS values for a 1024 {times} 512 sampled aperture for every frequency component) illustrates the efficacy of target recognition in terms of its far-field plane wave angular spectrum image. RCS images can then be viewed at different angles for target recognition, etc.

Collins, H.D.; Hall, T.E.

1992-07-01

322

Ultra wide band 3-D cross section (RCS) holography  

SciTech Connect

Ultra wide band impulse holography is an exciting new concept for predictive radar cross section (RCS) evaluation employing near-field measurements. Reconstruction of the near-field hologram data maps the target`s scattering areas, and uniquely identifies the ``hot spot`` locations on the target. In addition, the target and calibration sphere`s plane wave angular spectrums are computed (via digital algorithm) and used to generate the target`s far-field RCS values in three dimensions for each frequency component in the impulse. Thin and thick targets are defined in terms of their near-field amplitude variations in range. Range gating and computer holographic techniques are applied to correct these variations. Preliminary experimental results on various targets verify the concept of RCS holography. The unique 3-D presentation (i.e., typically containing 524,288 RCS values for a 1024 {times} 512 sampled aperture for every frequency component) illustrates the efficacy of target recognition in terms of its far-field plane wave angular spectrum image. RCS images can then be viewed at different angles for target recognition, etc.

Collins, H.D.; Hall, T.E.

1992-07-01

323

Performance Evaluation of Emerging High Performance Computing Technologies using WRF  

NASA Astrophysics Data System (ADS)

The Arctic Region Supercomputing Center (ARSC) has evaluated multicore processors and other emerging processor technologies for a variety of high performance computing applications in the earth and space sciences, especially climate and weather applications. A flagship effort has been to assess dual core processor nodes on ARSC's Midnight supercomputer, in which two-socket systems were compared to eight-socket systems. Midnight is utilized for ARSC's twice-daily weather research and forecasting (WRF) model runs, available at weather.arsc.edu. Among other findings on Midnight, it was found that the Hypertransport system for interconnecting Opteron processors, memory, and other subsystems does not scale as well on eight-socket (sixteen processor) systems as well as two-socket (four processor) systems. A fundamental limitation is the cache snooping operation performed whenever a computational thread accesses main memory. This increases memory latency as the number of processor sockets increases. This is particularly noticeable on applications such as WRF that are primarily CPU-bound, versus applications that are bound by input/output or communication. The new Cray XT5 supercomputer at ARSC features quad core processors, and will host a variety of scaling experiments for WRF, CCSM4, and other models. Early results will be presented, including a series of WRF runs for Alaska with grid resolutions under 2km. ARSC will discuss a set of standardized test cases for the Alaska domain, similar to existing test cases for CONUS. These test cases will provide different configuration sizes and resolutions, suitable for single processors up to thousands. Beyond multi-core Opteron-based supercomputers, ARSC has examined WRF and other applications on additional emerging technologies. One such technology is the graphics processing unit, or GPU. The 9800-series nVidia GPU was evaluated with the cuBLAS software library. While in-socket GPUs might be forthcoming in the future, current generations of GPUs lack a sufficient balance of computational resources to replace the general-purpose microprocessor found in most traditional supercomputer architectures. ARSC has also worked with the Cell Broadband Engine in a small Playstation3 cluster, as well as a 24-processor system based on IBM's QS22 blades. The QS22 system, called Quasar, features the PowerXCell 8i processor found in the RoadRunner system, along with an InfiniBand network and high performance storage. Quasar overcomes the limitations of the small memory and relatively slow network of the PS3 systems. The presentation will include system-level benchmarks on Quasar, as well as evaluation of the WRF test cases. Another technology evaluation focused on Sun's UltraSPARC T2+ processor, which ARSC evaluated in a two-way system. Each T2+ provides eight processor cores, each of which provides eight threads, for a total of 128 threads in a single system. WRF scalability was good up to the number of cores, but multiple threads per core did not scale as well. Throughout the discussion, practical findings from ARSC will be summarized. While multicore general-purpose microprocessors are anticipated to remain important for large computers running earth and space science applications, the role of other potentially disruptive technologies is less certain. Limitations of current and future technologies will be discussed. class="ab'>

Newby, G. B.; Morton, D.

2008-12-01

324

Implementation of Parallel Computing Technology to Vortex Flow  

NASA Technical Reports Server (NTRS)

Mainframe supercomputers such as the Cray C90 was invaluable in obtaining large scale computations using several millions of grid points to resolve salient features of a tip vortex flow over a lifting wing. However, real flight configurations require tracking not only of the flow over several lifting wings but its growth and decay in the near- and intermediate- wake regions, not to mention the interaction of these vortices with each other. Resolving and tracking the evolution and interaction of these vortices shed from complex bodies is computationally intensive. Parallel computing technology is an attractive option in solving these flows. In planetary science vortical flows are also important in studying how planets and protoplanets form when cosmic dust and gases become gravitationally unstable and eventually form planets or protoplanets. The current paradigm for the formation of planetary systems maintains that the planets accreted from the nebula of gas and dust left over from the formation of the Sun. Traditional theory also indicate that such a preplanetary nebula took the form of flattened disk. The coagulation of dust led to the settling of aggregates toward the midplane of the disk, where they grew further into asteroid-like planetesimals. Some of the issues still remaining in this process are the onset of gravitational instability, the role of turbulence in the damping of particles and radial effects. In this study the focus will be with the role of turbulence and the radial effects.

Dacles-Mariani, Jennifer

1999-01-01

325

Campus Computing, 1996. The Seventh National Survey of Desktop Computing and Information Technology in American Higher Education.  

ERIC Educational Resources Information Center

This report presents the findings of a June, 1996, survey of computing officials at 660 two- and four-year colleges and universities across the United States concerning the use of computer technology on college campuses. The survey found that instructional integration and user support emerged as the two most important information technology (IT)…

Green, Kenneth C.

326

An empirical study of technological pressure in the personal computer technology system  

Microsoft Academic Search

This paper studies the co-evolution of the GPU (graphics processing unit) and PC (personal computer) game sub-systems, with respect to graphics performance delivered to end-users during game play. Employing the concept of the reverse salient - a component which trails in technological performance and thus hinders potential system-wide development - the paper develops time-gap and performance-gap measures of reverse salience

Ozgur Dedehayir

2008-01-01

327

An easy teaching tool for holography  

NASA Astrophysics Data System (ADS)

In the framework of scientific outreach at the Maison des Sciences of Aix-Marseilles University, we created a teaching kit for holography that can be packed into a small case. It includes all the equipment required to produce holograms almost anywhere and has a simple optical assembly and very good vibration tolerance. The fundamental principles of holography and several applications are illustrated through simple experiments: reflection Denisyuk holograms, angular multiplexing, notch filters, holographic interferometry and diffraction holographic gratings. It is possible to use this tool for several purposes: science outreach, teaching for undergraduate and graduate students and continuing education. In this paper, we explain the basis of holography, how the kit works and indicate some applications and results that can be performed and obtained with it.

Voslion, T.; Escarguel, A.

2012-11-01

328

Fluidic technology: adding control, computation, and sensing capability to microfluidics  

NASA Astrophysics Data System (ADS)

This paper presents an overview of fluidic technology a technology that provides an additional dimension to conventional microfluidic technology by adding sensing, computation (both analog and digital) and control. The US Army Diamond Ordnance Fuze Labs officially recognized fluidics as a comprehensive technology comparable to electronics with its announcement in 1959. Because fluidic elements have very few or no moving parts the technology provides significant operational advantages in harsh environments (EMI, radiation, high temperature and vibration). It also offers advantages when dealing with fluid variables (flow, pressure, density, viscosity, etc.) by eliminating the need for interfaces. With the elimination of the inertia and friction associated with moving parts there are even greater advantages as a result of higher speed of operation. Where mechanical and micromechanical devices may be limited to only hundreds of hertz true microfluidic systems can operate at tens of thousands of hertz. We discuss the fundamental principles of jet deflection amplification and vortex modulation and present circuit building blocks such as the laminar proportional amplifier, vortex valve, oscillators, and positive-feedback digital components. However, most importantly, we present and discuss three specific applications illustrating the power of fluidics in microfluidics and MEMS. These are: a gas analyzer-on-a-chip, capable of simultaneous analysis of multiple gas mixtures with clinical accuracies; an intermittent oxygen delivery system that provides supplemental oxygen to ambulatory patients through a nasal cannula; and, an array of vortex microvalves capable of controlling propellants for micropropulsion systems or for the temporal and spatial modulation of fuel for the optimal control of gas turbine combustors. A sampling of other fluidic in microfluidic application are mentioned to include pressure and acoustic amplification (a kosher public address system is referenced), active noise cancellation for aircraft engines and passenger compartments, optical-pneumatic transduction in optical fiber missile controls and natural gas processing, angular rate sensing, and microcytometry for cellular processing. Fluidics may be the enabling technology for many as yet undeveloped applications, particularly when recent advances micro-fabrication are taken advantage of.

Drzewiecki, Tadeusz M.; Macia, Narciso F.

2003-04-01

329

Strange bedfellows in the personal computer industry: technology alliances between IBM and Apple  

Microsoft Academic Search

Until recently, technological development in the personal computer industry could be characterized by the competition between two basic designs. The current dominant design in this industry is associated with the IBM and Microsoft personal computing architecture. The other version of personal computing originated in the Macintosh computer from Apple Computer Company. In recent years, we also see an increasing number

John Hagedoorn; Elias Carayannis; Jeffrey Alexander

2001-01-01

330

Strange Bedfellows in the Personal Computer Industry: Technology Alliances between IBM and Apple  

Microsoft Academic Search

Until recently technological development in the personal computer industry could be characterized by the competition between two basic designs. The current dominant design in this industry is associated with the IBM and Microsoft personal computing architecture. The other version of personal computing originated in the Macintosh computer from Apple Computer Company. In recent years we also see an increasing number

John Hagedoorn; Elias Carayannis; Jeffrey Alexander

2000-01-01

331

The Utah Educational Technology Initiative Year Two Evaluation: Program Implementation, Computer Acquisition and Placement, and Computer Use.  

ERIC Educational Resources Information Center

This evaluation report describes program implementation, computer acquisition and placement, and computer use during the second year (1991-92) of the Utah Educational Technology Initiative (ETI). In addition, it discusses the various ways computers are used in Utah schools and reports the opinions and experiences of ETI coordinators in the 12…

Mergendoller, John R.; And Others

332

Minkowski diagram in relativity and holography.  

PubMed

Now that ultrashort laser pulses can be used in holography, the temporal and spatial resolution approach the same order of magnitude. In that case the limited speed of light sometimes causes large measuring errors if correction methods are not introduced. Therefore, we want to revive the Minkowski diagram, which was invented in 1908 to visualize relativistic relations between time and space. We show how this diagram in a modified form can be used to derive both the static holodiagram, used for conventional holography, including ultrahigh-speed recordings of wavefronts, and a dynamic holodiagram used for studying the apparent distortions of objects recorded at relativistic speeds. PMID:20531662

Abramson, N

1988-05-01

333

Systems analysis for DSN microwave antenna holography  

NASA Technical Reports Server (NTRS)

Proposed systems for Deep Space Network (DSN) microwave antenna holography are analyzed. Microwave holography, as applied to antennas, is a technique which utilizes the Fourier Transform relation between the complex far-field radiation pattern of an antenna and the complex aperture field distribution to provide a methodology for the analysis and evaluation of antenna performance. Resulting aperture phase and amplitude distribution data are used to precisely characterize various crucial performance parameters, including panel alignment, subreflector position, antenna aperture illumination, directivity at various frequencies, and gravity deformation. Microwave holographic analysis provides diagnostic capacity as well as being a powerful tool for evaluating antenna design specifications and their corresponding theoretical models.

Rochblatt, D. J.

1989-01-01

334

Holography on the Spacelab 3 mission  

NASA Technical Reports Server (NTRS)

Spacelab 3's Fluid Experiment System, in which triglycine sulfate crystals were produced by a low temperature solution-growth technique, employs holography as its primary data-gathering system. This use of holography allows optical techniques which would be difficult to apply in orbit to be used after the holographic data is returned to ground laboratories, using an analysis of the reconstructed holographic image. The system used allows both single- and double-exposure holograms to be obtained in two separate orthogonal configurations.

Owen, Robert B.; Kroes, R. L.

1985-01-01

335

X-ray holography with high resolution  

SciTech Connect

Some primary factors having effects on the resolution in x-ray holography are discussed. The factors in recording x-ray holograms are the x-ray coherent scattering by the specimen, the recording method and the coherence of the x-ray beam. There are two factors in reconstruction of the hologram. One is that the resolution of the detector may be lower than the spatial frequencies of fringes in x-ray holograms. The other is aberrations. Consequently, some conditions of x-ray holography with high resolution are given.

Chen Jianwen; Zhu Peiping; Xiao Tiqiao; Xu Zhizhan [Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, P. O. Box 800216, Shanghai, 201800 (China)

1995-05-01

336

The Impact of Computer Self-Efficacy and Technology Dependence on Computer-Related Technostress: A Social Cognitive Theory Perspective  

Microsoft Academic Search

As professionals and end users of computers, we are often experiencing being constantly surrounded by modern technology. One side effect of modern technology is termed technostress which refers to the “negative impact on attitudes, thoughts, behaviors, or body physiology that is caused either directly or indirectly by technology”. Based on social cognitive theory, this study developed a conceptual model in

Qin Shu; Qiang Tu; Kanliang Wang

2011-01-01

337

Intellectual property licensing issues in the holography business  

NASA Astrophysics Data System (ADS)

Increasingly, many high-tech companies are acquiring or transferring "leases" to the innovations used to make products. In legal parlance, these innovations-which may include new manufacturing methods, applications, devices or improvements-are considered "intellectual property" (IP), and the "leases" are referred to as "licenses." The holography business, like many other high-tech businesses, has evolved over many decades and consists of many densely packed IP subspaces. However, the IP space is constantly expanding through the development of new innovations and applications, such as security and storage applications, and new materials. Additionally, like most IP, the quality and business value of holographic IP ranges widely, which makes for a challenging IP licensing environment. This paper addresses IP licensing issues in the holography business, including some basics about the forms of IP and the basic types of IP licenses, the role of an IP space analysis in licensing activities, best-practice management of licensing activities, and how IP is properly scrutinized to assess licensing potential. The concept of the patent pool is discussed in connection with security holograms as well as other technologies.

Gortych, Joseph E.

2006-03-01

338

Teaching holography workshops to beginners  

NASA Astrophysics Data System (ADS)

This paper is useful for teaching holography workshops in classrooms as well as in makeshift locations such as museums, businesses, and homes. The target audience is very general, young children to adults of any profession, al of whom have no prior experience in making holograms. A typical number of participants is twenty-five, but can vary depending on space and personnel availability. A central original contribution of this paper is the discovery of a new chemical processing regime for the Slavich PFG-03M holographic plates. These silver halide plates have the highest resolution of its kind and some of the world's best holograms have been recorded on it for several decades. Due to its low sensitivity and long developing time, this material has been excluded form use in workshops. Our new processing regime JARB has the following advantages: It (1) increases the sensitivity of PFG-03M emulsion ten-fold without sacrificing resolution; (2) hardens the emulsion during processing without significant shrinkage; (3) has a ten- to twenty-second development time; (4) is quick drying using squeegee and warm air; and (5) allows the finished hologram to be viewable with laser or incandescent light. Other advantages of JARB are (1) low toxicity, (2) low volatility, (3) non-staining, (4) low cost, and (5) long shelf life.

Jeong, Tung H.; Aumiller, Riley W.; Ro, Raymond J.; Blyth, Jeff

2002-06-01

339

DSS-24 microwave holography measurements  

NASA Technical Reports Server (NTRS)

The JPL DSN Microwave Antenna Holography System (MAHST) was applied to the newly constructed DSS-24 34-m beam-waveguide antenna at Goldstone, California. The application of MAHST measurements and corrections at DSS 24 provided the critical RF performance necessary to not only meet the project requirements and goals, but to surpass them. A performance increase of 0.35 dB at X-band (8.45 GHz) and 4.9 dB at Ka-band (32 GHz) was provided by MAHST, resulting in peak efficiencies of 75.25 percent at X-band and 60.6 percent at Ka-band (measured from the Cassegrain focus at f1). The MAHST enabled setting the main reflector panels of DSS 24 to 0.25-mm rms, making DSS 24 the highest precision antenna in the NASA/JPL DSN. The precision of the DSS-24 antenna (diameter/rms) is 1.36 x 10(exp 5), and its gain limit is at 95 GHz.

Rochblatt, D. J.; Withington, P. M.; Jackson, H. J.

1995-01-01

340

Conformal Lifshitz gravity from holography  

NASA Astrophysics Data System (ADS)

We show that holographic renormalization of relativistic gravity in asymptotically Lifshitz spacetimes naturally reproduces the structure of gravity with anisotropic scaling: the holographic counterterms induced near anisotropic infinity take the form of the action for gravity at a Lifshitz point, with the appropriate value of the dynamical critical exponent z. In the particular case of 3 + 1 bulk dimensions and z = 2 asymptotic scaling near infinity, we find a logarithmic counterterm, related to anisotropic Weyl anomaly of the dual CFT, and show that this counterterm reproduces precisely the action of conformal gravity at a z = 2 Lifshitz point in 2 + 1 dimensions, which enjoys anisotropic local Weyl invariance and satisfies the detailed balance condition. We explain how the detailed balance is a consequence of relations among holographic counterterms, and point out that a similar relation holds in the relativistic case of holography in AdS 5. Upon analytic continuation, analogous to the relativistic case studied recently by Maldacena, the action of conformal gravity at the z = 2 Lifshitz point features in the ground-state wavefunction of a gravitational system with an interesting type of spatial anisotropy.

Griffin, Tom; Ho?ava, Petr; Melby-Thompson, Charles M.

2012-05-01

341

Some system implications of a Josephson computer technology  

NASA Astrophysics Data System (ADS)

The Josephson technology as now understood is projected onto a current computer mainframe, the IBM 3033, to estimate its effect. This is a hypothetical projection and should not be taken in any way to represent a planned product. A three cycle critical case path is identified. Then an experimental 2.5 micron Josephson current injection logic circuit family and cache memory design are configured into a functionally equivalent Josephson package. Propagation distances in the hypothetical package are estimated to be 6% of those in the comparison mainframe; estimated cycle time is 4 ns yielding an internal performance improvement by a factor of greater than 14. The Josephson version of the IBM 3033 would entail a more than 99% reduction in regulated power.

Marcus, M. J.

1981-04-01

342

Missile signal processing common computer architecture for rapid technology upgrade  

NASA Astrophysics Data System (ADS)

Interceptor missiles process IR images to locate an intended target and guide the interceptor towards it. Signal processing requirements have increased as the sensor bandwidth increases and interceptors operate against more sophisticated targets. A typical interceptor signal processing chain is comprised of two parts. Front-end video processing operates on all pixels of the image and performs such operations as non-uniformity correction (NUC), image stabilization, frame integration and detection. Back-end target processing, which tracks and classifies targets detected in the image, performs such algorithms as Kalman tracking, spectral feature extraction and target discrimination. In the past, video processing was implemented using ASIC components or FPGAs because computation requirements exceeded the throughput of general-purpose processors. Target processing was performed using hybrid architectures that included ASICs, DSPs and general-purpose processors. The resulting systems tended to be function-specific, and required custom software development. They were developed using non-integrated toolsets and test equipment was developed along with the processor platform. The lifespan of a system utilizing the signal processing platform often spans decades, while the specialized nature of processor hardware and software makes it difficult and costly to upgrade. As a result, the signal processing systems often run on outdated technology, algorithms are difficult to update, and system effectiveness is impaired by the inability to rapidly respond to new threats. A new design approach is made possible three developments; Moore's Law - driven improvement in computational throughput; a newly introduced vector computing capability in general purpose processors; and a modern set of open interface software standards. Today's multiprocessor commercial-off-the-shelf (COTS) platforms have sufficient throughput to support interceptor signal processing requirements. This application may be programmed under existing real-time operating systems using parallel processing software libraries, resulting in highly portable code that can be rapidly migrated to new platforms as processor technology evolves. Use of standardized development tools and 3rd party software upgrades are enabled as well as rapid upgrade of processing components as improved algorithms are developed. The resulting weapon system will have a superior processing capability over a custom approach at the time of deployment as a result of a shorter development cycles and use of newer technology. The signal processing computer may be upgraded over the lifecycle of the weapon system, and can migrate between weapon system variants enabled by modification simplicity. This paper presents a reference design using the new approach that utilizes an Altivec PowerPC parallel COTS platform. It uses a VxWorks-based real-time operating system (RTOS), and application code developed using an efficient parallel vector library (PVL). A quantification of computing requirements and demonstration of interceptor algorithm operating on this real-time platform are provided.

Rabinkin, Daniel V.; Rutledge, Edward; Monticciolo, Paul

2004-10-01

343

Computer Technologies in Teacher Education: The Measurement of Attitudes and Self-Efficacy.  

ERIC Educational Resources Information Center

The development and validation of two instruments which measure attitudes and self-efficacy of teacher education students and practicing teachers toward computer use are described. One instrument--Attitudes toward Computer Technologies (ACT)--assesses perceived usefulness of and comfort/anxiety with computer technologies. The second…

Kinzie, Mable B.; Delcourt, Marcia A. B.

344

The Technology Refresh Program: Affording State-of-the Art Personal Computing.  

ERIC Educational Resources Information Center

Describes the Florida Community College Technology Refresh Program in which 28 Florida community colleges refresh their personal computer technology on a three-year cyclical basis through negotiation of a contract with Dell Computer Corporation. Discusses the contract highlights (such as a 22.5 percent discount on personal computers and on-site…

Spiwak, Rand

2000-01-01

345

The relationship between student and faculty attitudes toward computer technology in advanced arts classes  

Microsoft Academic Search

This study examined the relationship between faculty attitudes toward computer technology and student attitudes toward computer technology in advanced arts classes at Middle Tennessee State University during spring semester 2004. This study was focused on the disciplines of art, dance, music, and theatre, and was limited to faculty and students engaged in the 3000 and 4000 level classes. The Computer

Virginia Donnell

2004-01-01

346

Female Students' Experiences Of Computer Technology In Single Versus Mixed-Gender School Settings  

Microsoft Academic Search

This study explores how female students compare learning computer technology in a single- versus a mixed- gender school setting. Twelve females participated, all of whom were enrolled in a grade 12 course in Communications' Technology. Data collection included a questionnaire, a semi-structured interview and focus groups. Participants described learning computer technology in the single-gender setting as more conducive to learning.

Lee-Ann Burke; Elizabeth Murphy

347

Prototype Space Technology Hall of Fame exhibit at Technology 2003: Analysis of data from computer-based questionaire  

NASA Technical Reports Server (NTRS)

The U.S. Space Foundation displayed its prototype Space Technology Hall of Fame exhibit design at the Technology 2003 conference in Anaheim, CA, December 7-9, 1993. In order to sample public opinion on space technology in general and the exhibit in particular, a computer-based survey was set up as a part of the display. The data collected was analyzed.

Ewell, Robert N.

1994-01-01

348

Real-Time Nearfield Acoustic Holography: Implementation of the Direct and Inverse Impulse Responses in the Time-Wavenumber Domain  

Microsoft Academic Search

The aim of the study is to demonstrate that some methods are more relevant for implementing the Real-Time Nearfield Acoustic Holography than others. First by focusing on the forward propagation problem, different approaches are compared to build the impulse response to be used. One of them in particular is computed by an inverse Fourier transform applied to the theoretical transfer

Jean-Hugh Thomas; Vincent Grulier; Sébastien Paillasseur; Jean-Claude Pascal

2008-01-01

349

Transmission Electron Holography of Polymer Microstructure.  

National Technical Information Service (NTIS)

This is the final report describing a four year effort to develop and apply phase contrast imaging based on transmission electron holography as a means to measure unstained multiphase polymer microstructure. The experiments involve a 200keV transmission e...

M. R. Libera

1998-01-01

350

Nearfield acoustical holography for interior spaces  

Microsoft Academic Search

In this thesis the techniques of Nearfield Acoustical Holography (NAH), a method for predicting acoustic radiation based upon measured acoustical field data, were extended to apply to acoustical radiation in interior spaces. A separation of variables approach to the problem was formulated, which was shown to provide a uniform approach to the treatment of interior problems in separable geometries through

Darren L Hallman

1996-01-01

351

Nearfield acoustic holography and its evolution  

Microsoft Academic Search

This paper reviews the evolution of nearfield acoustic holography (NAH) over the past two decades. The original NAH (Williams and Maynard, 1980) could only reconstruct acoustic radiation from a surface containing a level of constant coordinate in an exterior region. Soon a generalized NAH based on the Helmholtz integral theory and boundary element method (BEM) was developed to reconstruct acoustic

Sean Wu

2002-01-01

352

Focal plane location in digital holography  

Microsoft Academic Search

The correlation coefficient method is introduced to locate the focal plane in digital particle holography. It uses the fact that the correlation coefficient is maximum at the focal plane. The factors influencing this method are discussed with a numerical simulation of holograms. For real holograms, the Wiener filter was first proposed to process both recorded holograms and reconstructed images. The

Yan Yang; Bo-seon Kang; Yeon-jun Choo

2007-01-01

353

Synthetic optical holography for rapid nanoimaging  

PubMed Central

Holography has paved the way for phase imaging in a variety of wide-field techniques, including electron, X-ray and optical microscopy. In scanning optical microscopy, however, the serial fashion of image acquisition seems to challenge a direct implementation of traditional holography. Here we introduce synthetic optical holography (SOH) for quantitative phase-resolved imaging in scanning optical microscopy. It uniquely combines fast phase imaging, technical simplicity and simultaneous operation at visible and infrared frequencies with a single reference arm. We demonstrate SOH with a scattering-type scanning near-field optical microscope (s-SNOM) where it enables reliable quantitative phase-resolved near-field imaging with unprecedented speed. We apply these capabilities to nanoscale, non-invasive and rapid screening of grain boundaries in CVD-grown graphene, by recording 65 kilopixel near-field images in 26?s and 2.3 megapixel images in 13?min. Beyond s-SNOM, the SOH concept could boost the implementation of holography in other scanning imaging applications such as confocal microscopy.

Schnell, M.; Carney, P. S.; Hillenbrand, R.

2014-01-01

354

Speckle reduction techniques in digital holography  

NASA Astrophysics Data System (ADS)

We have studied several speckle reduction techniques, applicable to digital holography. These include the use of optical diffusers, wavelet filtering, simulating temporal incoherence and filtering in the Fourier domain. The Digital Holograms (DHs) used in this study are captured using a Phase Shift Interferometric (PSI) in-line setup and subsequently reconstructed numerically.

Monaghan, David; Kelly, Damien; Hennelly, Bryan; Javidi, Bahram

2010-02-01

355

Electron Holography: Applications to Materials Questions  

Microsoft Academic Search

Impressive progress has been made in the processing and exploration of new material on an atomic scale (nanomaterials). However, the characterization of such materials by the usual transmission electron microscopy (TEM) techniques suffers from the drawback that the phase of the object-modulated electron wave is virtually lost in the recorded intensity images. Electron holography has opened possibilities for analyzing both

Hannes Lichte; Petr Formanek; Andreas Lenk; Martin Linck; Christopher Matzeck; Michael Lehmann; Paul Simon

2007-01-01

356

Holography of incoherently illuminated 3D scenes  

Microsoft Academic Search

We review several methods of generating holograms of 3D realistic objects illuminated by incoherent white light. Using these methods, it is possible to obtain holograms with a simple digital camera, operating in regular light conditions. Thus, most disadvantages characterizing conventional holography, namely the need for a powerful, highly coherent laser and meticulous stability of the optical system are avoided. These

Natan T. Shaked; Joseph Rosen

2008-01-01

357

Proceedings: 1989 conference on advanced computer technology for the power industry  

SciTech Connect

An EPRI conference to address advanced computer technology was hosted by Arizona Public Service in Scottsdale, Arizona, December 4--6, 1989. Participants represented US and foreign utilities, major electric and computer industry vendors, R D contractors, and consulting firms. These proceedings contain the text of the technical presentations and summaries of the panel discussions. The conference objectives were: to assess modern computer technologies and how they will affect utility operations; to share US and foreign utility experiences in developing computer-based technical products; and to discuss research conducted by EPRI in advanced computer technology on behalf of its utility members. Technical presentations addressed a broad range of computer-related topics: computer-based training; engineering workshops; hypermeida and other advanced user interfaces; networks and communications; expert systems and other decision-support methodologies; intelligent database management; supercomputing architectures and applications; real-time data processing; computerized technology and information transfer; and neural networks and other emerging technologies.

Ghosh, B. (ed.)

1990-07-01

358

High-Resolution UV Holography Lens for Particle Size Distribution Measurements  

SciTech Connect

A high-resolution UV holography relay lens, shown in Figure 1, has been developed for measuring particle size distributions down to 0.5 ?m in a 12-mm-diameter by 5-mm-thick volume. This work has been selected by an independent judging panel and editors of R&D Magazine as a recipient of a 2009 R&D 100 Award. This award recognizes the 100 most technologically significant products introduced during the past year.

Malone, Morris Kaufman; Capelle, Gene; Grover, Mike; Sorenson, Dan; Pazuchanics, Pete

2010-01-01

359

Macroeconomic Effects of Computer and Communications Technology: An Intermediate Report.  

National Technical Information Service (NTIS)

Content: Introduction; The C&C Technology Using Industry; Studying the Economic Effects of New Technology - the problem; The Nature of Information and Communications Technology; The Firm Based Macro Model of the Swedish Economy - a brief presentation; Som...

G. Eliasson

1998-01-01

360

Computer vision challenges and technologies for agile manufacturing  

NASA Astrophysics Data System (ADS)

Sandia National Laboratories, a Department of Energy laboratory, is responsible for maintaining the safety, security, reliability, and availability of the nuclear weapons stockpile for the United States. Because of the changing national and global political climates and inevitable budget cuts, Sandia is changing the methods and processes it has traditionally used in the product realization cycle for weapon components. Because of the increasing age of the nuclear stockpile, it is certain that the reliability of these weapons will degrade with time unless eventual action is taken to repair, requalify, or renew them. Furthermore, due to the downsizing of the DOE weapons production sites and loss of technical personnel, the new product realization process is being focused on developing and deploying advanced automation technologies in order to maintain the capability for producing new components. The goal of Sandia's technology development program is to create a product realization environment that is cost effective, has improved quality and reduced cycle time for small lot sizes. The new environment will rely less on the expertise of humans and more on intelligent systems and automation to perform the production processes. The systems will be robust in order to provide maximum flexibility and responsiveness for rapidly changing component or product mixes. An integrated enterprise will allow ready access to and use of information for effective and efficient product and process design. Concurrent engineering methods will allow a speedup of the product realization cycle, reduce costs, and dramatically lessen the dependency on creating and testing physical prototypes. Virtual manufacturing will allow production processes to be designed, integrated, and programed off-line before a piece of hardware ever moves. The overriding goal is to be able to build a large variety of new weapons parts on short notice. Many of these technologies that are being developed are also applicable to commercial production processes and applications. Computer vision will play a critical role in the new agile production environment for automation of processes such as inspection, assembly, welding, material dispensing and other process control tasks. Although there are many academic and commercial solutions that have been developed, none have had widespread adoption considering the huge potential number of applications that could benefit from this technology. The reason for this slow adoption is that the advantages of computer vision for automation can be a double-edged sword. The benefits can be lost if the vision system requires an inordinate amount of time for reprogramming by a skilled operator to account for different parts, changes in lighting conditions, background clutter, changes in optics, etc. Commercially available solutions typically require an operator to manually program the vision system with features used for the recognition. In a recent survey, we asked a number of commercial manufacturers and machine vision companies the question, 'What prevents machine vision systems from being more useful in factories?' The number one (and unanimous) response was that vision systems require too much skill to set up and program to be cost effective.

Molley, Perry A.

1996-02-01

361

Overall Application of Computer Technology to the Education and Research Programs of Air University.  

National Technical Information Service (NTIS)

The determination of the overall application of computer technology to the education and research activities of Air University was undertaken by study team. The problem required that the need for computer assistance throughout the University be assessed. ...

R. H. Williams G. E. Talbert T. C. Cochran K. W. Potter

1969-01-01

362

Computer architectures for computational physics work done by Computational Research and Technology Branch and Advanced Computational Concepts Group  

NASA Technical Reports Server (NTRS)

Slides are reproduced that describe the importance of having high performance number crunching and graphics capability. They also indicate the types of research and development underway at Ames Research Center to ensure that, in the near term, Ames is a smart buyer and user, and in the long-term that Ames knows the best possible solutions for number crunching and graphics needs. The drivers for this research are real computational physics applications of interest to Ames and NASA. They are concerned with how to map the applications, and how to maximize the physics learned from the results of the calculations. The computer graphics activities are aimed at getting maximum information from the three-dimensional calculations by using the real time manipulation of three-dimensional data on the Silicon Graphics workstation. Work is underway on new algorithms that will permit the display of experimental results that are sparse and random, the same way that the dense and regular computed results are displayed.

1985-01-01

363

Roles of Computer Technology in the Mathematics Education of the Gifted.  

ERIC Educational Resources Information Center

This article reviews technological advances in educational computer use and discusses applications for computers as tools, tutors, and tutees in mathematics education of gifted students. Computer-assisted instruction, artificial intelligence, multimedia, numeric processing, computer-aided design, LOGO, robotics, and hypercard software packages are…

Grandgenett, Neal

1991-01-01

364

Digital holography particle image velocimetry for 3D flow measurement  

Microsoft Academic Search

A digital in-line holography recording system was used in the holography particle image velocimetry for a 3D flow measurement that are made up of the new full field fluid mechanics experimental technique--DHPIV. In this experiment, the traditional holography film was replaced by a CCD chip that record the interference stripe directly without the darkroom processing, and the virtual image slices

Runjie Wei; Gongxin Shen; Hanquan Ding

2003-01-01

365

Electron holography applied to the study of ceramic materials  

SciTech Connect

The experimental setup of a transmission electron microscope for electron holography is shown. Using a model system of small gold particles on amorphous germanium, capabilities of electron holography are demonstrated. These include nanodiffraction, energy filtering, correction of aberrations and separate display of image amplitude and phase. The method of electron holography is then applied to the characterization of a grain boundary in a Si{sub 3}N{sub 4} ceramic.

Voelkl, E.; Allard, L.F.; Nolan, T.A.

1993-09-01

366

The Use of Computer Technology by Older Adults.  

ERIC Educational Resources Information Center

The older adult (55+) population is becoming a significant presence in the personal computer market. Seniors have the discretionary income, experience, interest, and free time to make use of computers in interesting ways. A literature review found that older adults make use of computers in significant numbers: 30 percent of computer owners are…

Galusha, Jill M.

367

Technology in the Classroom: Computers and Instruction in Vermont's Schools.  

ERIC Educational Resources Information Center

This guide on technology gives parents and community members an understanding of how information technology is an essential part of children's education in Vermont's schools. The first section provides an overview of technology, including: using technology to collect, share, and analyze information in ways that were impossible ten years ago:…

Hyjek, Phil; Gilbert, Allen; Graham, Christine; Marsters, David; Reposa, Judi; Romond, Bill; Soule, Chuck; Tuscany, Bonnie.

368

An integrated model of technology acceptance for mobile computing  

Microsoft Academic Search

Technology acceptance models have been an important area of research in the Information Systems arena especially in the last 20 years. Most technology acceptance studies use factors from Davis's Technology Acceptance Model (TAM), Davis and Venkatesh's Extended Technology Acceptance Model (TAM2), Ajzen's Theory of Planned Behavior (TPB), and\\/or Goodhue's Task-Technology Fit (TTF) model. This study integrates factors from these four

Patricia H Lapczynski

2004-01-01

369

Lightforest and the MIT Museum Holography Education Project  

NASA Astrophysics Data System (ADS)

Lightforest installation is a large-scale holographic work permanently installed at the MIT Museum in Cambridge MA. Organic shapes in the rounded walls and floor of a small room (15 by 11 by 9 feet) frame the approximately 200 white- light transmission holograms of fabricated rainforest plants and light and image projections. Additional projects as a result of the Lightforest installation include the creation of a Holography Teaching Program at the MIT Museum, including a partnership with the WSNS elementary school and the creation of a holographic garden mural in the school combining real plants with reflection copies of Lightforest holograms. The combined Lightforest project makes important connections between art, technology, education, and the environment.

Connors, Betsy A.

1998-02-01

370

Ultrasonic Imaging of Subsurface Objects Using Photorefractive Dynamic Holography  

SciTech Connect

The INEEL has developed a photorefractive ultrasonic imaging technology that records both phase and amplitude of ultrasonic waves on the surface of solids. Phase locked dynamic holography provides full field images of these waves scattered from subsurface defects in solids, and these data are compared with theoretical predictions. Laser light reflected by a vibrating surface is imaged into a photorefractive material where it is mixed in a heterodyne technique with a reference wave. This demodulates the data and provides an image of the ultrasonic waves in either 2 wave or 4 wave mixing mode. These data images are recorded at video frame rates and show phase locked traveling or resonant acoustic waves. This technique can be used over a broad range of ultrasonic frequencies. Acoustic frequencies from 2 kHz to 10 MHz have been imaged, and a point measuring (non-imaging) version of the system has measured picometer amplitudes at 1 GHz.

Deason, Vance Albert; Telschow, Kenneth Louis; Watson, Scott Marshall

2001-07-01

371

Holography demonstrations and workshops for science and engineering outreach  

NASA Astrophysics Data System (ADS)

The SPIE/OSA Student Chapter at Michigan Technological University have developed demonstrations and workshops for science and engineering outreach. The practical approach to holography promotes the study of photonic related sciences in high school and college-aged students. An introduction to laser safety, optical laboratory practices, and basic laser coherence theory is given in order to first introduce the participants to the science behind the holograms. The students are then able to create a hologram of an item of their choice, personalizing the experience. By engaging directly, the students are able to see how the theory is applied and also enforces a higher level of attention from them so no mistakes are made in their hologram. Throughout the course participants gain an appreciation for photonics by learning how holograms operate and are constructed through hands on creation of their own holograms. This paper reviews the procedures and methods used in the demonstrations and workshop while examining the overall student experience.

Thomas, Weston; Kruse, Kevin; Middlebrook, Christopher

2012-10-01

372

Influence of Gender and Computer Teaching Efficacy on Computer Acceptance among Malaysian Student Teachers: An Extended Technology Acceptance Model  

ERIC Educational Resources Information Center

The purpose of this study is to validate the technology acceptance model (TAM) in an educational context and explore the role of gender and computer teaching efficacy as external variables. From the literature, it appeared that only limited studies had developed models to explain statistically the chain of influence of computer teaching efficacy…

Wong, Kung-Teck; Teo, Timothy; Russo, Sharon

2012-01-01

373

Relating Computer, Communication, and Computer-Mediated Communication Apprehensions to New Communication Technology Use in the Workplace  

Microsoft Academic Search

This study explores three issues regarding the use of multiple workplace communication technologies: the relationships between distinct forms of apprehension (computer, communication, and writing) and use, the relative contribution of computer-mediated communication (CMC) apprehension for predicting use, and changes in these relationships over time. A trend study, which consisted of the collection of data from two samples (N= 205) separated

Craig R. Scott; C. Erik Timmerman

2005-01-01

374

Campus Computing, 2001: The 12th National Survey of Computing and Information Technology in American Higher Education.  

ERIC Educational Resources Information Center

The 2001 Campus Computing Survey, the 12th such survey, is the largest continuing study of the role of computing and information technology in U.S. higher education today. The survey results in this report summarize data from 590 two- and four-year, public and private colleges across the United States, representing a 38.4% response rate. The focus…

Green, Kenneth C.

375

Summary of researches being performed in the Institute of Mathematics and Computer Science on computer science and information technologies  

Microsoft Academic Search

Evolution of the informatization notion (which assumes automa- tion of majority of human activities applying computers, computer networks, information technologies) towards the notion of Global Infor- mation Society (GIS) challenges the determination of new paradigms of society: automation and intellectualization of production, new level of education and teaching, formation of new styles of work, active par- ticipation in decision making,

Artiom Alhazov; Elena Boian; Liudmila Burtseva; Constantin Ciubotaru; Svetlana Cojocaru; Alexander Colesnicov; Constantin Gaindric; Galina Magariu; Iurie Rogojin; Tatiana Verlan

2008-01-01

376

An Empirical Investigation of the Relationshops Among Math Confidence, Computer Confidence and Computer Self-Efficacy: Implications for Technology Education  

Microsoft Academic Search

A popular issue in the 1980’s and early 1990’s, computer self-efficacy (CSE) remains an important area of research. Educators, industry leaders, and government officials argue that the United States is falling behind other countries in technology innovation. And, most attribute this situation to ineffective education in the areas of math, science, and technology. The current study provides insight into these

Morris Jr. R. Franklin; Evelyn H. Thrasher

2008-01-01

377

A method of 3D data information encryption with virtual holography  

NASA Astrophysics Data System (ADS)

In this paper, a new method of 3D data information encryption with virtual holography is proposed. The data information is encoded in the form of 3-D data cubes. A cube can be described as an assembly of slices which are parallel planes along the coordinates at an interval of d. The dot on the slices of the 3-D data cube represents a bit, and the bright one means "1", while the dark one means "0". The hologram of the 3-D cube is generated in computer with virtual holography, and the hologram can be transformed into a secondary hologram with virtual holography technique again. Thus the 3-D data cube can be encrypted in the form of the secondary hologram, in which the parameters are used as the keys, such as the wavelength of light, the propagation distance of wave, the geometrical parameters of the data cube and so on. Only all of the parameters keys are provided correctly, the data information can be retrieved entirely. Numerical experiments are performed to illustrate the ability to encrypt the 3-D data information with virtual holograph technique. The computer simulation results show, that the data information can obtain higher security and certain robustness with this method.

Huang, Zhen; Liu, Guodong; Ren, Zhong; Zeng, Lüming

2008-12-01

378

Fascinating Technology: Computer Games as an Issue for Religious Education  

ERIC Educational Resources Information Center

Computer games as an important part of youth culture can, from a certain perspective, be highly relevant for religious education. I will review the role of computer games, and then give a brief overview, suggesting a specific phenomenological approach for research on computer games and religious education. After presenting one example of such…

Scholtz, Christopher P.

2005-01-01

379

Making Advanced Computer Science Topics More Accessible through Interactive Technologies  

ERIC Educational Resources Information Center

Purpose: Teaching advanced technical concepts in a computer science program to students of different technical backgrounds presents many challenges. The purpose of this paper is to present a detailed experimental pedagogy in teaching advanced computer science topics, such as computer networking, telecommunications and data structures using…

Shao, Kun; Maher, Peter

2012-01-01

380

Reconfiguring Basic Computer Occupations: Between Technology and Service.  

ERIC Educational Resources Information Center

The nature of basic computer occupations has changed greatly since the early 1980s. The changes reveal a shift in the respective roles of the sectors of industry associated with computer services (manufacturing and industrial computing). The service sector has adopted the procedures of industry in terms of organization, methods, and quality,…

Liaroutzos, Oliver; Robichon, Marc

2000-01-01

381

The application of microprocessor technology to in-flight computation  

NASA Technical Reports Server (NTRS)

A modular design of a general purpose microprocessor-based computer to perform in-flight computations for cross-country soaring pilots is described. The basic requirements for the system are discussed. Several specialized applications of the computer are presented, including real-time pilot feedback and flight-test data acquisition and reduction.

Sawyer, P. L.; Somers, D. M.

1979-01-01

382

Computer Literacy and Social Stratification. Interactive Technology Laboratory Report #9.  

ERIC Educational Resources Information Center

As schools acquire and use computers for educational purposes, two major questions arise: (1) whether students from different strata of society will obtain equal access to computers, and (2) whether students from different strata of society will be taught similar or different uses of the computer. To explore the relationship between the…

Mehan, Hugh

383

The Role of Computer Technology in Teaching Reading and Writing: Preschool Teachers' Beliefs and Practices  

ERIC Educational Resources Information Center

This study investigated preschool teachers' beliefs and practices regarding the use of computer technology in teaching reading and writing in Jordan. The researcher developed a questionnaire consisting of two scales--Teachers' Beliefs Scale (TB Scale) and Teachers' Practices Scale (TP Scale)--to examine the role of computer technology in teaching…

Ihmeideh, Fathi

2010-01-01

384

Computer Technologies in Teacher Education: The Measurement of Attitudes and Self-Efficacy.  

ERIC Educational Resources Information Center

Describes the development of two instruments for use with preservice and practicing teachers: Attitudes toward Computer Technologies and Self-Efficacy for Computer Technologies. Graduate and undergraduate students completed the instruments. Results provide initial instrument validation. The paper presents data on content validity and results of…

Delcourt, Marcia A. B.; Kinzie, Mable B.

1993-01-01

385

A Meta-Analysis of Effectiveness Studies on Computer Technology-Supported Language Learning  

ERIC Educational Resources Information Center

With the aim of summarizing years of research comparing pedagogies for second/foreign language teaching supported with computer technology and pedagogy not-supported by computer technology, a meta-analysis was conducted of empirical research investigating language outcomes. Thirty-seven studies yielding 52 effect sizes were included, following a…

Grgurovic, Maja; Chapelle, Carol A.; Shelley, Mack C.

2013-01-01

386

Wireless broadband application technology investigation of IPv6 optical network cloud computing  

Microsoft Academic Search

With the development of 3G network and internet technology, the rapid upgrading of internet users. It is a trend that IPv6 supersedes IPv4 and the optical network becomes more widely. Integrating a number of hotspot advanced technologies, the “wireless broadband application system for IPV6 optical network cloud computing” is a novel system with practical research importance. The cloud computing platform

Gu Cai-dong; Li Jing-Xiang; Wu Jian-ping; Fu Ying-li; Lu Kan; Si Mao-xin

2010-01-01

387

Beginnings: Introducing Computer Technology to Students in Speech-Language Pathology and Audiology.  

ERIC Educational Resources Information Center

In the areas of audiology and speech science, computer technology has moved to the forefront in both the clinical and laboratory settings. It is imperative that students in both speech-language pathology and audiology acquire fundamental skills with all aspects of computer technology in order to maintain professional marketability. A survey of 75…

McErlain, Eileen; Squibb, Kevin

388

Tech-Prep Competency Profiles within the Business/Computer Technologies.  

ERIC Educational Resources Information Center

This document, which is designed for educators throughout Ohio who are involved in planning and/or delivering tech prep programs within the business/computer technologies cluster, discusses and presents tech prep competency profiles (TCPs) for 12 business/computer technology occupations. The first part of the document contains the following:…

Ohio State Univ., Columbus. Center on Education and Training for Employment.

389

Biomedical Computing Technology Information Center: introduction and report of early progress  

Microsoft Academic Search

In July 1975, the Biomedical Computing Technology Information Center (BCTIC) was established by the Division of Biomedical and Environmental Research of the U. S. Energy Research and Development Administration (ERDA) at the Oak Ridge National Laboratory. BCTIC collects, organizes, evaluates, and disseminates information on computing technology pertinent to biomedicine, providing needed routes of communication between installations and serving as a

B. F. Maskewitz; R. L. Henne; W. J. McClain

1976-01-01

390

The Biomedical Computing Technology Information Center (BCTIC) sharing programs, data, and interface designs  

Microsoft Academic Search

In response to a recognized need to facilitate computing technology transfer in biomedicine, the Biomedical Computing Technology Information Center (BCTIC) was established by the Division of Biomedical and Environmental Research (DBER) of the Energy Research and Development Administration (ERDA) at the Oak Ridge National Laboratory in July of 1975. BCTIC forged ahead into the tasks of designing guidelines and procedures,

Betty F. Maskewitz; R. L. Henne; W. J. McClain

1976-01-01

391

Biomedical Computing Technology Information Center (BCTIC) sharing program, data, and interface design  

Microsoft Academic Search

In response to a recognized need to facilitate computing technology transfer in biomedicine, the Biomedical Computing Technology Information Center (BCTIC) was established by the Division of Biomedical and Environmental Research (DBER) of the U.S. Energy Research and Development Administration (ERDA) at the Oak Ridge National Laboratory in July of 1975. This paper presents the problems BCTIC has set out to

B. F. Maskewitz; R. L. Henne; W. J. McClain

1976-01-01

392

The application efficiency of computer technology in higher vocational education for disabled students  

Microsoft Academic Search

With the popularization of computer technology,it used more and more in support education teaching .this paper combined with the practise teaching in higher vocational education for disabled students,discussed the application efficiency of computer technology in higher vocational education for hearing-impaired students and bling students.

Mao Shichun

2011-01-01

393

The Application of Knowledge Elicitation Techniques in the Computer-based Technology Education Environment  

Microsoft Academic Search

he teaching of Technology Education is becoming increasing involved with the use of computer technology. Computers are now commonly used to enable students to control devices such as lathes, mills and robots, to acquire data for input into the process of improving the solutions to problems, to design new products through the use of CAD, to design and test electronic,

Ivan Chester

394

Integration of Computer Technology into Teacher Preparation Programs at Historically Black Colleges and Universities  

Microsoft Academic Search

Computer technology and instructional media are increasingly becoming an integral part of the teaching profession. Most educational material, including textbooks, has some form of instructional storage media and Internet address that teachers and students can use to obtain supplements and actual course material. Such infusion of technology into the classroom requires that teachers receive sufficient computer related training in their

Shawon Bernard; Lai C. Liu; Kai S. Koong

395

STAGES OF COMPUTER TECHNOLOGY INTEGRATION: THREE CASE STUDIES OF TEACHER EDUCATION PROGRAMS  

Microsoft Academic Search

Three teacher education programs were studied to explore the practice of infusing computer technology into the curriculum. The focus of this study was to define the developmental stages that schools, colleges, and departments of education experienced as faculty and students moved from lower to higher levels of computer technology use and integration. Data was gathered at the participating sites from

Cheri A. Toledo

396

Predicting Preservice Teacher Competence in Computer Technology: Modeling and Application in Training Environments  

Microsoft Academic Search

The purpose of this study was to determine if modeling by university professors and practicum and cooperating teachers was related to preservice teachers' perceptions of their computer technology skills and if preservice teachers' use of technology in academic and other settings was related to those perceptions. Seventy-nine preservice teacher education students completed a survey of their training experience and computer

Linda Fleming; Vahid Motamedi; Lisa May

2007-01-01

397

Culturally Responsive Uses of Computer Technology: A Portrait of Three Teachers Working in Urban Schools  

Microsoft Academic Search

There is a dire need to prepare all students, especially those most marginalized in the US, for the digital age. Unfortunately, access to and uses of the Internet and computer related technologies continue to be a persistent problem for many students. Since schools serve as one of the few access points for utilizing computer technologies, this article, using an interpretive

Rona Frederick; Kmt Shockley

398

A Five-Stage Model of Computer Technology Integration Into Teacher Education Curriculum  

Microsoft Academic Search

Three teacher education programs were studied to explore the process of integrating computer technology into the curriculum. The focus of this study was to define the stages that schools, colleges, and departments of education experienced as faculty and students moved from lower to higher levels of computer technology use and integration. Data were gathered at the participating sites from three

Cheri Toledo

2005-01-01

399

Underwater hybrid near-field acoustical holography based on the measurement of vector hydrophone array  

NASA Astrophysics Data System (ADS)

Hybrid near-field acoustical holography (NAH) is developed for reconstructing acoustic radiation from a cylindrical source in a complex underwater environment. In hybrid NAH, we combine statistically optimized near-field acoustical holography (SONAH) and broadband acoustical holography from intensity measurements (BAHIM) to reconstruct the underwater cylindrical source field. First, the BAHIM is utilized to regenerate as much acoustic pressures on the hologram surface as necessary, and then the acoustic pressures are taken as input to the formulation implemented numerically by SONAH. The main advantages of this technology are that the complex pressure on the hologram surface can be reconstructed without reference signal, and the measurement array can be smaller than the source, thus the practicability and efficiency of this technology are greatly enhanced. Numerical examples of a cylindrical source are demonstrated. Test results show that hybrid NAH can yield a more accurate reconstruction than conventional NAH. Then, an experiment has been carried out with a vector hydrophone array. The experimental results show the advantage of hybrid NAH in the reconstruction of an acoustic field and the feasibility of using a vector hydrophone array in an underwater NAH measurement, as well as the identification and localization of noise sources.

Hu, Bo; Yang, Desen; Sun, Yu

2010-06-01

400

The Dialogic Classroom: Teachers Integrating Computer Technology, Pedagogy, and Research.  

ERIC Educational Resources Information Center

The 12 essays collected in this book suggest both practical and theoretical approaches to teaching through networked technologies. Moving beyond technology for its own sake, the book articulates a pedagogy which makes its own productive uses of emergent technologies, both inside and outside the classroom. The book models for students one possible…

Galin, Jeffrey R., Ed.; Latchaw, Joan, Ed.

401

Integration of Old and New Technology: Computers, Photography, and Video Technology in an Even Start Family Literacy Project.  

ERIC Educational Resources Information Center

McCosh Even Start, a federally funded family-literacy project located in a Chicago school, used older donated Apple computers, video technology, and photography to develop literacy and also to evaluate parents' and children's literacy progress. Older and newer technologies were successfully combined. (MLH)

Landerholm, Elizabeth

1999-01-01

402

Compressive multiple view projection incoherent holography.  

PubMed

Multiple view projection holography is a method to obtain a digital hologram by recording different views of a 3D scene with a conventional digital camera. Those views are digitally manipulated in order to create the digital hologram. The method requires a simple setup and operates under white light illuminating conditions. The multiple views are often generated by a camera translation, which usually involves a scanning effort. In this work we apply a compressive sensing approach to the multiple view projection holography acquisition process and demonstrate that the 3D scene can be accurately reconstructed from the highly subsampled generated Fourier hologram. It is also shown that the compressive sensing approach, combined with an appropriate system model, yields improved sectioning of the planes of different depths. PMID:21451634

Rivenson, Yair; Stern, Adrian; Rosen, Joseph

2011-03-28

403

Massively parallel X-ray holography  

NASA Astrophysics Data System (ADS)

Advances in the development of free-electron lasers offer the realistic prospect of nanoscale imaging on the timescale of atomic motions. We identify X-ray Fourier-transform holography as a promising but, so far, inefficient scheme to do this. We show that a uniformly redundant array placed next to the sample, multiplies the efficiency of X-ray Fourier transform holography by more than three orders of magnitude, approaching that of a perfect lens, and provides holographic images with both amplitude- and phase-contrast information. The experiments reported here demonstrate this concept by imaging a nano-fabricated object at a synchrotron source, and a bacterial cell with a soft-X-ray free-electron laser, where illumination by a single 15-fs pulse was successfully used in producing the holographic image. As X-ray lasers move to shorter wavelengths we expect to obtain higher spatial resolution ultrafast movies of transient states of matter.

Marchesini, Stefano; Boutet, Sébastien; Sakdinawat, Anne E.; Bogan, Michael J.; Bajt, Saša; Barty, Anton; Chapman, Henry N.; Frank, Matthias; Hau-Riege, Stefan P.; Szöke, Abraham; Cui, Congwu; Shapiro, David A.; Howells, Malcolm R.; Spence, John C. H.; Shaevitz, Joshua W.; Lee, Joanna Y.; Hajdu, Janos; Seibert, Marvin M.

2008-09-01

404

Holography for the investigation of technical systems  

NASA Astrophysics Data System (ADS)

Industrial application of holographic interferometry may be taken as the headline to describe the research work of Zoltan Fuzessy. Under this general theme investigations from the material properties determination to vibration measurements at running motors are included. In the field of quality control the differential holography has to be mentioned a specialty of his research group, which might have a lot of power in the control of components shape. In this paper a few topics are reported connected with the research work of Zoltan Fuzessy under headline 'Application of Holography for the Investigation of Machines and Systems.' In addition to his work results from other research groups are cited, which may be influenced by him or follow the same ideas.

Jueptner, Werner P.

1998-09-01

405

Holography and noncommutative yang-mills theory  

PubMed

In this Letter a recently proposed gravity dual of noncommutative Yang-Mills theory is derived from the relations between closed string moduli and open string moduli recently suggested by Seiberg and Witten. The only new input one needs is a simple form of the running string tension as a function of energy. This derivation provides convincing evidence that string theory integrates with the holographical principle and demonstrates a direct link between noncommutative Yang-Mills theory and holography. PMID:11017215

Li; Wu

2000-03-01

406

Enhancing nearfield acoustic holography using wavelet transform  

Microsoft Academic Search

When there are low signal to noise relationships or low coherences between measured pressure and a reference sensor, a pressure\\u000a field measured and estimated by NAH (Nearfield Acoustic Holography) becomes noisy on the hologram and source planes. This\\u000a paper proposes a method to obtain the high coherent de-noised pressure signals from low coherent noisy ones by combining a\\u000a wavelet algorithm

Byeongsik Ko

2004-01-01

407

Landweber iterative regularization for nearfield acoustic holography  

Microsoft Academic Search

On the basis of the distributed source boundary point method (DSBPM)-based nearfield acoustic holography (NAH), Landweber\\u000a iterative regularization method is proposed to stabilize the NAH reconstruction process, control the influence of measurement\\u000a errors on the reconstructed results and ensure the validity of the reconstructed results. And a new method, the auxiliary\\u000a surface method, is proposed to determine the optimal iterative

Chuanxing Bi; Xinzhao Chen; Rong Zhou; Jian Chen

2006-01-01

408

Constraining noncommutative field theories with holography  

Microsoft Academic Search

An important window to quantum gravity phenomena in low energy noncom-mutative (NC) quantum field theories (QFTs) gets represented\\u000a by a specific form of UV\\/IR mixing. Yet another important window to quantum gravity, a holography, manifests itself in effective\\u000a QFTs as a distinct UV\\/IR connection. In matching these two principles, a useful relationship connecting the UV cutoff ?UV, the IR cutoff

Raul Horvat; Josip Trampetic

2011-01-01

409

Measuring Shapes Of Reflectors By Microwave Holography  

NASA Technical Reports Server (NTRS)

Pair of reports discusses theoretical foundation and recent theoretical and practical developments in use of microwave holography to measure surfaces of microwave antennas. (Second report abbreviated version of first report.) Microwave holographic measurements provide acceptable accuracy and are more convenient and less time consuming than optical and mechanical measurements, especially where measurements repeated. Microwave holographyic metrology of lare reflectors, first reported in 1976, improved into accurate technique with potential industrial applications.

Rahmat-Samii, Y.

1989-01-01

410

The application of computer-aided technologies in automotive styling design  

NASA Astrophysics Data System (ADS)

In automotive industry, outline design is its life and creative design is its soul indeed. Computer-aided technology has been widely used in the automotive industry and more and more attention has been paid. This paper chiefly introduce the application of computer-aided technologies including CAD, CAM and CAE, analyses the process of automotive structural design and describe the development tendency of computer-aided design.

Zheng, Ze-feng; Zhang, Ji; Zheng, Ying

2012-04-01

411

Computer-Related Assistive Technology: Satisfaction and Experiences among Users with Disabilities  

ERIC Educational Resources Information Center

Many people with disabilities use assistive technology devices (ATDs) for computer access. The specific focus of this exploratory study was (a) to assess the experiences, opinions, and satisfaction levels of 24 individuals with disabilities using computer-related ATDs; (b) to investigate their awareness of health risk factors related to computer

Burton, Mary; Nieuwenhuijsen, Els R.; Epstein, Marcy J.

2008-01-01

412

Developments in the Location, Technology and Industrial Organization of Computer Services: Some Trends and Research Issues  

Microsoft Academic Search

HOWELLS J. (1987) Developments in the location, technology and industrial organization of computer services: some trends and research issues, Reg. Studies21, 493–503. Computer services are growing rapidly in mature industrial economics. Turnover is expanding quickly, new firm formation rates are high and employment growth is continuing to expand. In spatial terms, computer services in the UK remain concentrated in the

Jeremy Howells

1987-01-01

413

Computer Attitude of Teaching Faculty: Implications for Technology-Based Performance in Higher Education  

ERIC Educational Resources Information Center

This study examined the validity of Selwyn's computer attitude scale (CAS) and its implication for technology-based performance of randomly sampled (n = 167) multidiscipline teaching faculty in higher education in Ghana. Considered, computer attitude is a critical function of computer attitude and potential performance. Composed of four…

Larbi-Apau, Josephine A.; Moseley, James L.

2012-01-01

414

The Impact of Personal Computing Technology on the Educational Administration Knowledge Base.  

ERIC Educational Resources Information Center

Computer courses have become part of the educational administration knowledge base. This paper considers issues under the general question, What effect does computing have on the knowledge base? Three major areas concerning the impact of computer technology on the educational-administration knowledge base are described. First the paper describes…

House, Jess E.

415

A Teacher's Perspective on Technology in the Classroom: Computer Visualization, Concept Maps and Learning Logs.  

ERIC Educational Resources Information Center

Discusses the impact of computer technology on education, highlighting concept maps, electronic learning logs, and computer simulations, which provide students deeper understanding of chemistry and research methods while doing real science and help teachers conduct ongoing formative assessment of class progress. Computer simulations help teachers…

Hurwitz, Charles L.; Abegg, Gerald

1999-01-01

416

Review of parallel computing methods and tools for FPGA technology  

NASA Astrophysics Data System (ADS)

Parallel computing is emerging as an important area of research in computer architectures and software systems. Many algorithms can be greatly accelerated using parallel computing techniques. Specialized parallel computer architectures are used for accelerating speci c tasks. High-Energy Physics Experiments measuring systems often use FPGAs for ne-grained computation. FPGA combines many bene ts of both software and ASIC implementations. Like software, the mapped circuit is exible, and can be recon gured over the lifetime of the system. FPGAs therefore have the potential to achieve far greater performance than software as a result of bypassing the fetch-decode-execute operations of traditional processors, and possibly exploiting a greater level of parallelism. Creating parallel programs implemented in FPGAs is not trivial. This paper presents existing methods and tools for ne-grained computation implemented in FPGA using Behavioral Description and High Level Programming Languages.

Cieszewski, Rados?aw; Linczuk, Maciej; Pozniak, Krzysztof; Romaniuk, Ryszard

2013-10-01

417

A Computer-Assisted Approach for Conducting Information Technology Applied Instructions  

ERIC Educational Resources Information Center

The growing popularity of computer and network technologies has attracted researchers to investigate the strategies and the effects of information technology applied instructions. Previous research has not only demonstrated the benefits of applying information technologies to the learning process, but has also revealed the difficulty of applying…

Chu, Hui-Chun; Hwang, Gwo-Jen; Tsai, Pei Jin; Yang, Tzu-Chi

2009-01-01

418

SPEECH TECHNOLOGY IN COMPUTER-AIDED LANGUAGE LEARNING: STRENGTHS AND LIMITATIONS OF A NEW CALL PARADIGM  

Microsoft Academic Search

We investigate the suitability of deploying speech technology in computer-based systems that can be used to teach foreign language skills. In reviewing the current state of speech recognition and speech processing technology and by examining a number of voice-interactive CALL applications, we suggest how to create robust interactive learning environments that exploit the strengths of speech technology while working around

Farzad Ehsani; Eva Knodt

1998-01-01

419

The Technology Fix: The Promise and Reality of Computers in Our Schools  

ERIC Educational Resources Information Center

During the technology boom of the 1980s and 1990s, computers seemed set to revolutionize education. Do any of these promises sound familiar? (1) Technology would help all students learn better, thanks to multimedia programs capable of adapting to individual needs, learning styles, and skill levels; (2) Technology would transform the teacher's role…

Pflaum, William D.

2004-01-01

420

Does technological performance gap drive product performance?: An explorative study of personal computer gaming  

Microsoft Academic Search

In this paper we firstly develop a means to measure the technological performance disparity between evolving technological sub-systems of the PC (personal computer) system and subsequently employ this measure in the study of the GPU (graphics processing unit) and PC game sub-systems¿ evolutions. Secondly, the paper explores the connection between the observed temporal behavior of technological performance gap and the

O. Dedehayir; S. J. Makinen

2008-01-01

421

Display holography in the United Kingdom, 1994-1997  

NASA Astrophysics Data System (ADS)

This paper reports on developments in display holography in the UK since 1994, covering the activities of individual holographers and artists, small companies and larger commercial concerns. It also includes comments on reactions to the withdrawal of Agfa-Geveart Ltd from the production of silver-halide materials for holography.

Benyon, Margaret

1998-02-01

422

Intrinsic speckle noise in off-axis particle holography  

Microsoft Academic Search

In holographic imaging of particle fields, the interference among coherent wave fronts associated with particle scattering gives rise to intrinsic speckle noise, which sets a fundamental limit on the amount of information that particle holography can deliver. It has been established that the intrinsic speckle noise is especially severe in in-line holography because of superposition of virtual image waves, the

Ye Pu; Hui Meng

2004-01-01

423

Color holography: a new technique for reproduction of paintings  

Microsoft Academic Search

Until recently, display holography was usually associate with 3D imaging. After the appearance of color holography it has become possible, however, to record holographic images of 2D objects, such as, for example, oil paintings. The realistic-looking virtual image recorded in a Denisyuk reflection hologram is the most suitable for such reproductions. A holographic contact recording of a painting reproduces the

Hans I. Bjelkhagen; Dalibor Vukicevic

2002-01-01

424

Large-format automated pulsed holography camera system  

Microsoft Academic Search

An automated pulsed holography camera system for ultra-large format display holography has been created. This camera produces reflection and rainbow copies of up to 110 X 150 cm size as well as master holograms of up to 80 X 100 cm size. In addition, the system is capable of generating digital full color transmission rainbow holograms from masters produced by

Alexey M. Rodin; David B. Ratcliffe; Roman Rus

2001-01-01

425

Digital Holography and its Application to Firearm Identification Recording  

Microsoft Academic Search

In digital holography a CCD camera records optically generated holograms which is then reconstructed numerically by a calculation of scalar diffraction in the Fresnel approximation. By avoiding photographic film recording and physical reconstruction by illuminating the photographic plate with a laser in traditional holography, digiral photography facilitates real time transmission of the message via traditional communication methods. In this paper

Chunnong Zhao; Dongguang Li; Anthony Craig Watson

2002-01-01

426

Image Watermark Technique Based on Digital Holography and Ridgelet Transform  

Microsoft Academic Search

A novel image watermark algorithm based on digital holography and ridgelet transform was designed by taking the advantage that ridgelet transform domain is a most suitable representation of image's linear outline edge features. Firstly, the image was divided into blocks, and each block was transformed by finite ridgelet transformation. Secondly, the digital holography watermark is embedded into the most energetic

Jian-Ping Huang

2010-01-01

427

Laser Holography. High Tech with High Potential for Learning Activities.  

ERIC Educational Resources Information Center

This article discusses the procedure, historical development, and applications of holography, and discusses the feasibility and value of implementing a unit or course of study of laser holography into an existing photography laboratory and curriculum. An equipment and supplies list, giving supplies and cost, is included. (CT)

Schlegel, Ronald D.

1986-01-01

428

Integration of a conoscopic holography sensor on a CMM  

NASA Astrophysics Data System (ADS)

Conoscopic Holography is a non-contact digitizing technique used for verification and reverse engineering tasks. Conoscopic holography share some advantages with other non-contact digitizing techniques: surface digitizing from a secure distance and high point sampling rates. On the other hand, conoscopic holography owns some exclusive advantages: no occlusion problems, vision angles up to 85° and a higher robustness against variations in surface characteristics. The work presented here is part of a project that aims to evaluate conoscopic holography performance when used as an on-machine measurement system. Here, the scope is the integration of a conoscopic holography sensor onto a coordinates measuring machine. Special attention has been paid to calibration procedure, in order to achieve measurements with similar accuracy as those obtained with more common techniques, like laser triangulation sensors.

Fernández, P.; Blanco, D.; Valiño, G.; Hoang, H.; Suárez, L.; Mateos, S.

2012-04-01

429

Science and Technology Resources on the Internet: Computer Security.  

ERIC Educational Resources Information Center

Discusses issues related to computer security, including confidentiality, integrity, and authentication or availability; and presents a selected list of Web sites that cover the basic issues of computer security under subject headings that include ethics, privacy, kids, antivirus, policies, cryptography, operating system security, and biometrics.…

Kinkus, Jane F.

2002-01-01

430

Autonomic computing technologies for cyber-physical systems  

Microsoft Academic Search

Cyber-physical systems (CPS) are characterized by extremely tight integration of and coordination between computational and physical resources. Embedded computers and networks in the cyber world monitor and control the physical world. But it is impossible to make systems suitable to all situations because the physical world has much uncertainty and uncontrollable condition. The interactive mechanism between the cyber world and

Ingeol Chun; Wontae Kim; Woochun Kang; Haeyoung Lee

2010-01-01

431

Disruptive technology for private networks and computer backbone  

NASA Astrophysics Data System (ADS)

Optical communication is invading short distance communication (e.g. private networks etc.) as well as the digital computer backplane. Many optical devices have already been developed for these applications and many other newer devices are emerging. Possible optical devices for private networks and computer backplane are reviewed, and their deployment in different applications are also cited.

Awwal, Abdul Ahad S.; Dutta, Achyut K.

2001-12-01

432

Evaluation of computer-based ultrasonic inservice inspection systems  

SciTech Connect

This report presents the principles, practices, terminology, and technology of computer-based ultrasonic testing for inservice inspection (UT/ISI) of nuclear power plants, with extensive use of drawings, diagrams, and LTT images. The presentation is technical but assumes limited specific knowledge of ultrasonics or computers. The report is divided into 9 sections covering conventional LTT, computer-based LTT, and evaluation methodology. Conventional LTT topics include coordinate axes, scanning, instrument operation, RF and video signals, and A-, B-, and C-scans. Computer-based topics include sampling, digitization, signal analysis, image presentation, SAFI, ultrasonic holography, transducer arrays, and data interpretation. An evaluation methodology for computer-based LTT/ISI systems is presented, including questions, detailed procedures, and test block designs. Brief evaluations of several computer-based LTT/ISI systems are given; supplementary volumes will provide detailed evaluations of selected systems.

Harris, R.V. Jr.; Angel, L.J.; Doctor, S.R.; Park, W.R.; Schuster, G.J.; Taylor, T.T. [Pacific Northwest Lab., Richland, WA (United States)

1994-03-01

433

Computer-Based Technology and Learning: Evolving Uses and Expectations.  

ERIC Educational Resources Information Center

To understand the value and impact of technology, one must recognize that there have been three distinct phases in technology uses and expectations: Print Automation, Expansion of Learning Opportunities, and Data-Driven Virtual Learning. This report takes an in-depth look at these three phases and, for each, addresses two important and highly…

Valdez, Gilbert; McNabb, Mary; Foertsch, Mary; Anderson, Mary; Hawkes, Mark; Raack, Lenaya

434

Use of Computer Speech Technologies To Enhance Learning.  

ERIC Educational Resources Information Center

Discusses the design of an innovative learning system that uses new technologies for the man-machine interface, incorporating a combination of Automatic Speech Recognition (ASR) and Text To Speech (TTS) synthesis. Highlights include using speech technologies to mimic the attributes of the ideal tutor and design features. (AEF)

Ferrell, Joe

1999-01-01

435

Computer aided manufacturing process planning by Group Technology application  

Microsoft Academic Search

The program for machine is important for creation a new parts in industry. In this time, the NC (numerical control) is very used. NC is technology, in which the program for controlling of the machine is used; for example for drilling, lathes, milling, conventional and unconventional cutting machines (laser, water-jet, plasma). CNC programming may use the application of Group Technology

V. Fecova; J. Novak-Marcincin; M. Janak; J. Barna; L. Novakova-Marcincinova

2011-01-01

436

The innovation dynamics and technology cycles in the computer industry  

Microsoft Academic Search

This paper presents certain novel composite measures of technology. There are several important uses of the proposed measures in R & D management: to gauge the rate of innovation within any given field, to determine the relative contribution of chosen variables to technical progress, to isolate critical factors in the innovative activity, and to predict whether a technology is ahead

Devendra Sahal

1984-01-01

437

STEM-Based Computational Modeling for Technology Education  

ERIC Educational Resources Information Center

According to professionals in education, change is an ever-present and evolving process. With transformation in education at both state and national levels, technology education must determine a position in this climate of change. This paper reflects the views on the future of technology education based on an ongoing research project. The purpose…

Clark, Aaron C.; Ernst, Jeremy V.

2008-01-01

438

Spin-transfer torque magnetoresistive random-access memory technologies for normally off computing (invited)  

NASA Astrophysics Data System (ADS)

Most parts of present computer systems are made of volatile devices, and the power to supply them to avoid information loss causes huge energy losses. We can eliminate this meaningless energy loss by utilizing the non-volatile function of advanced spin-transfer torque magnetoresistive random-access memory (STT-MRAM) technology and create a new type of computer, i.e., normally off computers. Critical tasks to achieve normally off computers are implementations of STT-MRAM technologies in the main memory and low-level cache memories. STT-MRAM technology for applications to the main memory has been successfully developed by using perpendicular STT-MRAMs, and faster STT-MRAM technologies for applications to the cache memory are now being developed. The present status of STT-MRAMs and challenges that remain for normally off computers are discussed.

Ando, K.; Fujita, S.; Ito, J.; Yuasa, S.; Suzuki, Y.; Nakatani, Y.; Miyazaki, T.; Yoda, H.

2014-05-01

439

Acoustic Holography of the Solar Convection Zone with SOHO-MDI Observations  

NASA Technical Reports Server (NTRS)

The original grant with the title stated above was NAG5-10984, awarded to the Solar Physics Research Corporation (SPRC) in July, 2001, and was to be a three-year project. The basic theme of the project was the development and application of computational seismic holography for imaging, diagnostics, and monitoring of magnetic anomalies beneath active regions, in the deep solar interior, and on the Sun's far surface. The project was roughly separated into the following five tasks: (1) A holographic survey of active regions. (2) p-Mode absorption diagnostics of magnetic regions. (3) Acoustic modeling of the shallow subphotospheres of active regions and the quiet-Sun supergranulation based on phase-correlation seismic holography. (4) Seismic holography of the deep convection zone. (5) Improvements in holographic imaging of the far surface of the Sun. Following the death of Karen Harvey, President of SPRC, during the first year, the grant was transferred to Northwest Research Associates as NAG5-12901. Substantial but progress had been made on most of the above tasks in the first year under NAG5-10984, but none were completed. This work was continued under NAG5-12901.

Lindsey, Charles

2005-01-01

440

Welcome to the Computing Centre (Helsinki University of Technology).  

National Technical Information Service (NTIS)

Contents; The Computers at HUTCC and Who's Allowed to Use Them; How to Get an Account; Services of HUTCC; Connecting; Electronic Mail; Network News; Files and Directories; Printing; If Something Goes Wrong; Information Services; Appendix I: Glossary (sana...

A. Holmberg J. Korpela

1995-01-01

441

Process for making products using waterjet technology and computer software  

US Patent & Trademark Office Database

A kit of components and a process which combines the use of water cutting and computer software to create design art images for insertion in interlocking pavers that can interlock with pre-manufactured pavers.

2003-09-09

442

Radiotherapy Monte Carlo simulation using cloud computing technology.  

PubMed

Cloud computing allows for vast computational resources to be leveraged quickly and easily in bursts as and when required. Here we describe a technique that allows for Monte Carlo radiotherapy dose calculations to be performed using GEANT4 and executed in the cloud, with relative simulation cost and completion time evaluated as a function of machine count. As expected, simulation completion time decreases as 1/n for n parallel machines, and relative simulation cost is found to be optimal where n is a factor of the total simulation time in hours. Using the technique, we demonstrate the potential usefulness of cloud computing as a solution for rapid Monte Carlo simulation for radiotherapy dose calculation without the need for dedicated local computer hardware as a proof of principal. PMID:23188699

Poole, C M; Cornelius, I; Trapp, J V; Langton, C M

2012-12-01

443

Computing and information technology in a distributed environment. An overview  

Microsoft Academic Search

Even before the computer was invented, the concept of parallel computation was applied to solving many supercomplex problems\\u000a manually using large teams of operators. In this overview, the possibility of solving problems in parallel is analyzed and\\u000a the durability of parallel systems is estimated. As well, parallelization methods, supercomputer unfriendliness, information\\u000a and access management in distributed environments, distributed systems applied

E. B. Dudin; E. G. Zakharova; Yu. G. Smetanin

2008-01-01

444

Budgeting for Computer Technology in the Small College Library  

ERIC Educational Resources Information Center

Addresses the need for liberal arts colleges and the use of available technology/automation to help secure their survival. Some factors to be considered in planning and budgeting for automation are discussed. (Author/MBR)

Axford, H. William

1978-01-01

445

Computer Science and Technology: Overview of Computer Security Certification and Accreditation.  

National Technical Information Service (NTIS)

This overview summarizes how to establish and carry out a program and a technical process for computer security certification and accreditation of sensitive computer applications. The overview identifies and briefly describes the steps involved in perform...

Z. G. Ruthberg W. Neugent

1984-01-01

446

STEM-Based Computational Modeling for Technology Education  

Microsoft Academic Search

According to professionals in education, change is an ever-present and evolving process.With transformation in education at both state and national levels, technology education must determine a position in this climate of change.This paper reflects the views on the future of technology education based on an ongoing research project. The purpose of the project is to show a contemporary view of

Aaron C. Clark; Jeremy V. Ernst

447

Improving computer basis teaching through mobile communication and cloud computing technology  

Microsoft Academic Search

With the world coming into the information age, computer basis course has become the public basic course which must be set up in colleges and universities and the increasing popularization of computers makes the computer basis education in university facing with more and more higher request. That requires teachers to answer questions in time, but a teacher usually teaches hundreds

Weiqing Zhao; Yafei Sun; Lijuan Dai

2010-01-01

448

Mobile Agents for Wireless Computing: The Convergence of Wireless Computational Models with Mobile-Agent Technologies  

Microsoft Academic Search

Wireless mobile computing breaks the stationary barrier and allows users to compute and access information from anywhere and at anytime. However, this new freedom of movement does not come without new challenges. The mobile computing environment is constrained in many ways. Mobile elements are resource-poor and unreliable. Their network connectivity is often achieved through low-bandwidth wireless links. Furthermore, connectivity is

Constantinos Spyrou; George Samaras; Evaggelia Pitoura; Paraskevas Evripidou

2004-01-01

449

National Institute of Standards and Technology, Computer Security Division Annual Report, 2010.  

National Technical Information Service (NTIS)

The Computer Security Division (CSD), a component of NISTs Information Technology Laboratory (ITL), conducts research, development and outreach necessary to provide standards and guidelines, tools, metrics and practices to protect our nations information ...

2010-01-01

450

Pedagogical Design of Computer Mediated Communication Tasks: Learning Objectives and Technological Capabilities.  

ERIC Educational Resources Information Center

Discusses the need for clear pedagogical objectives in the use of technological resources for second language teaching. Examines the resources and constraints of computer-mediated communication vis-a-vis specific pedagogical tasks. (Author/VWL)

Salaberry, M. Rafael

2000-01-01

451

Personal Computer Based English-Russian and Russian-English Dictionaries of Business and Information Technology.  

National Technical Information Service (NTIS)

The properties, main features and implementation on all types of personal computers and Disk Operating Systems (DOS) of two English-Russian and Russian-English Dictionaries of Business Operations and Information Technology are described. Most of thekey te...

L. A. Golemanov A. H. Manolov

1992-01-01

452

Progress in hypersonic combustion technology with computation and experiment  

NASA Technical Reports Server (NTRS)

Design of successful airbreathing engines for operation at near-orbital speeds presents significant challenges in all the disciplines involved, including propulsion. This paper presents a discussion of the important physics of hypersonic combustion and an assessment of the state of the art of ground simulations with pulse facilities and with computational techniques. Recent examples of experimental and computational simulations are presented and discussed. The need for continued application of these tools to establish the credibility and fidelity of engineering design methods for practical hypersonic combustors is emphasized along with the critical need for improved diagnostic methods for hypervelocity reacting flows.

Anderson, Griffin Y.; Kumar, Ajay; Erdos, John I.

1990-01-01

453

Digital spatially incoherent Fresnel holography  

NASA Astrophysics Data System (ADS)

We present a new method for recording digital holograms under incoherent illumination. Light is reflected from a 3D object, propagates through a diffractive optical element (DOE), and is recorded by a digital camera. Three holograms are recorded sequentially, each for a different phase factor of the DOE. The three holograms are superposed in the computer, such that the result is a complex-valued Fresnel hologram. When this hologram is reconstructed in the computer, the 3D properties of the object are revealed.

Rosen, Joseph; Brooker, Gary

2007-04-01

454

Digital spatially incoherent Fresnel holography.  

PubMed

We present a new method for recording digital holograms under incoherent illumination. Light is reflected from a 3D object, propagates through a diffractive optical element (DOE), and is recorded by a digital camera. Three holograms are recorded sequentially, each for a different phase factor of the DOE. The three holograms are superposed in the computer, such that the result is a complex-valued Fresnel hologram. When this hologram is reconstructed in the computer, the 3D properties of the object are revealed. PMID:17375151

Rosen, Joseph; Brooker, Gary

2007-04-15

455

Digital holography from shadowgraphic phase estimates  

NASA Astrophysics Data System (ADS)

Digital phase front retrieval from inline, Gabor-type holograms has to overcome the challenge of separating the object wave from its conjugate by retrieving the phase of the optical field. Recently, the so-called 'twin image problem' has received revived interest, mainly in conjunction with lens-less digital holography applications in the XUV or X-ray bands. In this context, we propose to use a recently devised algorithm, the iterative shadowgraphy method (ISM), to solve the twin-image problem and use the retrieved phase front for digital holography applications. The algorithm is based on the principle that the measurement of phase gradients, which drive the diffraction process, enable the retrieval of the transverse phase profile of a field by observing its intensity distribution on different propagation planes. We have proven rigorously that for small phase modulated object waves, the algorithm converges to the correct object wavefront using just two snapshots of the propagated intensity field as input. Because the algorithm is akin to a deconvolution algorithm, experimental noise can destabilize the iteration scheme. In this work, we discuss the influence of noise in the ISM and apply a wavelet-based scheme to regularize the data. We show that the phase retrieved from two experimental, defocused pictures of a weakly absorbing, scattering object can be used to accurately reconstruct the object trough numerical back-propagation. Thus we prove that ISM is suitable for digital holography applications. We compare the ISM to various other schemes, such as direct backpropagation and the Gerchberg-Saxton algorithm and find that the ISM scheme gives a much improved reconstruction of the phase front.

Eilenberger, Falk; Pliakis, Dimitris; Minardi, Stefano; Pertsch, Thomas

2010-04-01

456

Managing Technostress: Optimizing the Use of Computer Technology.  

ERIC Educational Resources Information Center

Afraid of change, many employees refuse to join the computer revolution. The author states that only understanding and proper training can break down such resistance. The term "technostress" is described and the importance of employee self-assessment is examined. (CT)

Brod, Craig

1982-01-01

457

Future of computing technology in physics - the potentials and pitfalls  

SciTech Connect

The impact of the developments of modern digital computers is discussed, especially with respect to physics research in the future. The effects of large data processing capability and increasing rates at which data can be acquired and processed are considered. (GHT)

Brenner, A.E.

1984-02-01

458

Computer Technology and Its Impact on Recreation and Sport Programs.  

ERIC Educational Resources Information Center

This paper describes several types of computer programs that can be useful to sports and recreation programs. Computerized tournament scheduling software is helpful to recreation and parks staff working with tournaments of 50 teams/individuals or more. Important features include team capacity, league formation, scheduling conflicts, scheduling…

Ross, Craig M.

459

SAMGrid experiences with the Condor technology in Run II computing  

SciTech Connect

SAMGrid is a globally distributed system for data handling and job management, developed at Fermilab for the D0 and CDF experiments in Run II. The Condor system is being developed at the University of Wisconsin for management of distributed resources, computational and otherwise. We briefly review the SAMGrid architecture and its interaction with Condor, which was presented earlier. We then present our experiences using the system in production, which have two distinct aspects. At the global level, we deployed Condor-G, the Grid-extended Condor, for the resource brokering and global scheduling of our jobs. At the heart of the system is Condor's Matchmaking Service. As a more recent work at the computing element level, we have been benefiting from the large computing cluster at the University of Wisconsin campus. The architecture of the computing facility and the philosophy of Condor's resource management have prompted us to improve the application infrastructure for D0 and CDF, in aspects such as parting with the shared file system or reliance on resources being dedicated. As a result, we have increased productivity and made our applications more portable and Grid-ready. Our fruitful collaboration with the Condor team has been made possible by the Particle Physics Data Grid.

Baranovski, A.; Loebel-Carpenter, L.; Garzoglio, G.; Herber, R.; Illingworth, R.; Kennedy, R.; Kreymer, A.; Kumar, A.; Lueking, L.; Lyon, A.; Merritt, W.; Terekhov, I.; Trumbo, J.; Veseli, S.; White, S.; /Fermilab; St. Denis, R.; /Glasgow U.; Jain, S.; Nishandar, A.; /Texas U., Arlington

2004-12-01

460

Computer Technology: How It Impacts the Lives of Older Adults.  

ERIC Educational Resources Information Center

Results of surveys of Mini White House Conference attendees, Norwalk (Connecticut) Senior Center members, and SeniorNet participants indicate that many senior citizens are interested in learning and/or using computers for a variety of purposes including socialization, personal financial management, intergenerational communication, special…

Thompson, Marilyn

1996-01-01

461

Computer-Integrated Manufacturing Technology. Tech Prep Competency Profile.  

ERIC Educational Resources Information Center

This tech prep competency profile covers these occupations: manufacturing technician, computer-assisted design and drafting (CADD) technician, quality technician, and mechanical technician. Section 1 provides occupation definitions. Section 2 lists development committee members. Section 3 provides the leveling codes---abbreviations for grade level…

Lakeland Tech Prep Consortium, Kirtland, OH.

462

Technology Development for Linear Optics Quantum Computing Program.  

National Technical Information Service (NTIS)

This is the final report for an augmentation grant to investigate a linear optics approach to quantum computing. The main results of the study include a demonstration of a CNOT logic gate, a source of single photons on demand, a quantum memory device for ...

J. D. Franson

2005-01-01

463

Computer Technology Can Enhance Presentation of Pharmacological Principles.  

ERIC Educational Resources Information Center

The use of liquid crystal display (LCD) techniques for projection of computer monitor images onto a large screen for classroom viewing is discussed and illustrated with a pharmacology class presentation on drug/neurotransmitter-receptor interactions. The method is seen as a way of bringing a new dynamic to visual instruction. (MSE)

Riffee, William H.

1991-01-01

464

Applying Computers and Educational Technology to Individually Prescribed Instruction.  

ERIC Educational Resources Information Center

Research for Better Schools, Inc. (RBS) has three major components in its individualized learning program--Individually Prescribed Instruction (IPI), Automated Learning Management System (ALMS), and computer assisted instruction (CAI). IPI is an instructional system based on a specific set of educational objectives and has correlated to these…

Becker, James W.; Scanlon, Robert G.

465

Adults' Uses of Computer Technology: Associations with Literacy Tasks  

ERIC Educational Resources Information Center

The present study examined data from a large, nationally representative sample--the National Assessment of Adult Literacy (NCES, 2007)--to examine how computer use and Internet-based literacy practices (use of e-mail, searching for information on the Internet, and Internet chatting) were related to prose, document, and quantitative literacy…

Smith, M. Cecil; Smith, Thomas J.

2010-01-01

466

COMPUTER MODEL TECHNOLOGY TRANSFER IN THE UNITED STATES  

EPA Science Inventory

Computer-based mathematical models for urban water resources planning, management and design are widely used by engineers and planners in both the public and private sectors. In the United States, the majority of the users are in the private (consulting) sector, yet most of the m...

467

The Mobile Agent Security Enhanced by Trusted Computing Technology  

Microsoft Academic Search

The mobile agent (MA) technology has been widely used to archive plenty of applications in distributed systems. The mobile agents are completely exposed in different hosts and easy to be attacked by different adversaries. In this paper, the requirements for security of MA are analyzed. Considering the security and safety problems both in software and hardware, we construct a way

Xiaoping Wu; Zhidong Shen; Huanguo Zhang

2006-01-01

468

Carnival—Combining Speech Technology and Computer Animation  

Microsoft Academic Search

Speech is powerful information technology and the basis of human interaction. By emit- ting streams of buzzing, popping, and hissing noises from our mouths, we transmit thoughts, intentions, and knowledge of the world from one mind to another. We're accustomed to thinking of speech as an acoustic, auditory phenomenon. However, speech is also visible. Although the primary function of speech

Michael Berger; Gregor Hofer; Hiroshi Shimodaira

2011-01-01

469

Computer software: federal policy for a critical technology  

Microsoft Academic Search

It is suggested that a federal policy to promote software for commercial as well as military needs is justified based on the many needs the US has for software, and the inability of the private sector alone to adequately advance the technology required to meet those needs. Since the government has already taken significant steps toward a dual-use software policy,

K. J. Catalanotto

1993-01-01

470

Educational Computing in the Schools: Technology, Communication, and Literacy.  

ERIC Educational Resources Information Center

This book is a collection of articles that examine critical issues of technology, teaching, and learning in three areas: access, communication, and literacy. Following an Introduction by Jay Blanchard, articles are presented in three sections: Access and Opportunity; Online Communication; and Literacy. The articles include: "An Exploration of…

Blanchard, Jay, Ed.

471

Computer-automated multiparadigm modeling in control systems technology  

Microsoft Academic Search

The use of model-based technologies has made it imperative for the development of a feedback control system to deal with many different tasks such as: plant modeling in all its variety; model reduction to achieve a complexity or level of abstraction suitable for the design task at hand; synthesis of control laws that vary from discrete event reactive control to

P. J. Mosterman; J. Sztipanovits; S. Engell

2004-01-01

472

Computer Access in Higher Education for Students with Disabilities: A Practical Guide to the Selection and Use of Adapted Computer Technology. Second Edition.  

ERIC Educational Resources Information Center

The manual provides a review of trends in adapted computer technology as well as guidelines to the selection and use of computer technology in college programs serving disabled students. Changes in the second edition include a new section dealing with the computer access needs of the severely disabled, an enlarged product guide, a curriculum guide…

Brown, Carl; And Others

473

College and the Digital Generation: Assessing and Training Students for the Technological Demands of College by Exploring Relationships between Computer Self-Efficacy and Computer Proficiency  

ERIC Educational Resources Information Center

Today's college students are often labeled the "Net Generation" and assumed to be computer savvy and technological minded. Exposure to and use of technologies can increase self-efficacy regarding ability to complete desired computer tasks, but students arrive on campuses unable to pass computer proficiency exams. This is concerning because some…

Morris, Kathleen M.

2010-01-01

474

Dynamic holography for extended object beam shaping  

NASA Astrophysics Data System (ADS)

We describe a laboratory experiment to improve the energy-on-target for an extended object. We utilize an iterative approach combining digital holography for detection and SLM beam shaping for object re-illumination. We developed a technique to modify the SLM phase to prevent oversharpening of glints and other high intensity return signal points that cause the beam to collapse to a single point with further iterations. Instead, the gain is increased as more light uniformly hits the intended target with each iteration. We present laboratory results to verify this approach and demonstrate the increased gain resulting from this dynamic beam-shaping.

Watnik, Abbie T.; Lebow, Paul S.

2013-09-01

475

Dynamic holography in quantum well cavities  

NASA Astrophysics Data System (ADS)

High efficiency dynamic holography at 1.55 microns is achieved on a broad-area InP based multiple quantum well devices. The quantum well cavity is sandwiched between a DBR and amorphous mirror, and consists of a number of wells. High energy pulsed writing beams at 1.06 microns generate free carrier gratings which are probed by a 1.55 micron tunable laser in a four wave mixing configuration. Diffraction efficiency into a single order of 30% has been achieved by contribution of a phase grating, mode pulling and asymmetric Fabry-Perot reflection.

Sun, H.; Nolte, D. D.; Hyland, Jim; Harmon, Eric

2013-03-01

476

Dark field electron holography for strain measurement.  

PubMed

Dark field electron holography is a new TEM-based technique for measuring strain with nanometer scale resolution. Here we present the procedure to align a transmission electron microscope and obtain dark field holograms as well as the theoretical background necessary to reconstruct strain maps from holograms. A series of experimental parameters such as biprism voltage, sample thickness, exposure time, tilt angle and choice of diffracted beam are then investigated on a silicon-germanium layer epitaxially embedded in a silicon matrix in order to obtain optimal dark field holograms over a large field of view with good spatial resolution and strain sensitivity. PMID:21333860

Béché, A; Rouvière, J L; Barnes, J P; Cooper, D

2011-02-01

477

Cancer treatment by x-ray holography  

NASA Astrophysics Data System (ADS)

The objective of radiation treatment of cancer is eradication of the tumor. The disadvantage of radiation therapy is that it may injure or destroy adjacent normal tissues. Therefore, if we could focalize the radiant energy exactly on the tumor cells, then the adjacent normal tissues would be protected. X-ray holography permits us the realization of this idea. In this paper three methods are proposed in order to record and reconstruct required holograms by x-ray and the advantages and disadvantages of each method are discussed.

Madjidi-Zolbin, Habib; Jafari, Saeed

1996-09-01

478

Improved processing for silver halide pulse holography  

NASA Astrophysics Data System (ADS)

Using of an improved developer with optical latensification allowed to significantly increase exposure sensitivity of currently in use silver halide materials. Transmission large-scale holograms (30 X 40 cm2) of diffused objects have been recorded under pulse exposure of about 6.5 X 10-6 J/cm2 for VRP and of about 2 X 10-6 J/cm2 for Agfa-Gavaert 8E56HD, in both cases without appreciable contrast deterioration. Results of the first experiments on pulse reflection holography are also discussed.

Mikhailov, Viktor N.; Son, Jung-Young; Grinevitskaya, Olga V.; Lee, Hyuk-Su; Choi, Y.-J.

1996-04-01

479

Three-dimensional nonlinear acoustical holography  

NASA Astrophysics Data System (ADS)

Nearfield Acoustical Holography (NAH) is an acoustic field visualization technique that can be used to reconstruct three-dimensional (3-D) acoustic fields by projecting two-dimensional (2-D) data measured on a hologram surface. However, linear NAH algorithms developed and improved by many researchers can result in significant reconstruction errors when they are applied to reconstruct 3-D acoustic fields that are radiated from a high-level noise source and include significant nonlinear components. Here, planar, nonlinear acoustical holography procedures are developed that can be used to reconstruct 3-D, nonlinear acoustic fields radiated from a high-level noise source based on 2-D acoustic pressure data measured on a hologram surface. The first nonlinear acoustic holography procedure is derived for reconstructing steady-state acoustic pressure fields by applying perturbation and renormalization methods to nonlinear, dissipative, pressure-based Westervelt Wave Equation (WWE). The nonlinear acoustic pressure fields radiated from a high-level pulsating sphere and an infinite-size, vibrating panel are used to validate this procedure. Although the WWE-based algorithm is successfully validated by those two numerical simulations, it still has several limitations: (1) Only the fundamental frequency and its second harmonic nonlinear components can be reconstructed; (2) the application of this algorithm is limited to mono-frequency source cases; (3) the effects of bent wave rays caused by transverse particle velocities are not included; (4) only acoustic pressure fields can be reconstructed. In order to address the limitations of the steady-state, WWE-based procedure, a transient, planar, nonlinear acoustic holography algorithm is developed that can be used to reconstruct 3-D nonlinear acoustic pressure and particle velocity fields. This procedure is based on Kuznetsov Wave Equation (KWE) that is directly solved by using temporal and spatial Fourier Transforms. When compared to the WWE-based procedure, the KWE-based procedure can be applied to multi-frequency source cases where each frequency component can contain both linear and nonlinear components. The effects of nonlinear bent wave rays can be also considered by using this algorithm. The KWE-based procedure is validated by conducting an experiment with a compression driver and four numerical simulations. The numerical and experimental results show that holographically-projected acoustic fields match well with directly-calculated and directly-measured fields.

Niu, Yaying

480

Neutron Holography Measurement Using Multi Array Detector  

NASA Astrophysics Data System (ADS)

Atomic-resolution neutron holography was carried out utilizing the powder diffrcatometer in JRR-3M reactor. Spherically emitted neutrons around a PdH0.78 single crystal produced by incoherent neutron-proton scattering, which formed a hologram, were efficiently collected using multi array 3He detectors. In addition to the hologram data, strong undulation due to the elastic thermal scattering was observed. To exclude this effect, the thermal scattering pattern was calculated and subtracted from the measured data. From the resulting hologram data, neighboring Pd and H nuclei images were successfully reconstructed.

Hayashi, Kouichi; Ohoyama, Kenji; Orimo, Shin-ichi; Nakamori, Yuko; Takahashi, Hideyuki; Shibata, Kaoru

2008-04-01

481

X-ray holography of biological specimens  

SciTech Connect

The author reviews the reasons for x-ray imaging of biological specimens and the techniques presently being used for x-ray microscopy. The author points out the advantages of x-ray holography and the difficulties of obtaining the requisite coherence with conventional sources. The author discusses the problems of radiation damage and the remarkable fact that short pulse x-ray sources circumvent these problems and obtain high-resolution images of specimens in the living state. Finally, the author reviews some of the efforts underway to develop high-intensity coherent x-ray sources for the laboratory. 14 references, 5 figures, 2 tables.

Solem, J.C.

1984-01-01

482

Results and further experiments using Spacelab holography  

NASA Technical Reports Server (NTRS)

Spacelab 3 provided the platform for the first extensive application of holography in space. Holograms of excellent quality were recorded during the flight, providing information on the solution growth of triglycine sulfate crystals under microgravity conditions. The suppression of convection and the development of a symmetric concentration-depletion region around each crystal were clearly shown. Crystal growth was governed by diffusion mass transport across the depletion region. The successful performance of the holographic unit has prompted NASA to schedule a slightly modified version for reflight on IML-1; opportunities now exist for other investigators to use this facility.

Owen, R. B.; Kroes, R. L.; Witherow, W. K.

1986-01-01

483

Proceedings: 1989 conference on advanced computer technology for the power industry  

SciTech Connect

An EPRI conference to address advanced computer technology was hosted by Arizona Public Service in Scottsdale, Arizona, December 4--6, 1989. Participants represented US and foreign utilities, major electric and computer industry vendors, R D contractors, and consulting firms. These Proceedings contain the text of the technical presentations and summaries of the panel discussions. The conference objectives were: to asses modern computer technologies and how they will effect utility operations; to share US and foreign utility experiences in developing computer-based technical products; and to discuss research conducted by EPRI in advanced computer technology on behalf of its utility members. Technical presentations addressed a broad range of computer-related topics: Computer-Based Training, Engineering Workstations, Hypermedia and Other Advanced User Interfaces, Networks and Communications, Expert Systems and Other Decision-Support Methodologies, Intelligent Database Management, Supercomputing Architectures and Applications, Real-Time Data Processing, Computerized Technology and Information Transfer, and Neural Networks and Other Emerging Technologies. In addition, two panel sessions were conducted to provide a forum for utilities to discuss past and future directions of EPRI software, and the future role of engineering workstations in utilities. The results of these two panels are summarized in this paper.

Ghosh, B. (ed.)

1990-07-01

484

Biomedical Computing Technology Information Center: an international resource for technology sharing  

Microsoft Academic Search

The expense of developing and maintaining special computer software and interfaces has been prohibitive to many clinical installations desiring to perform computer-assisted radionuclide and other biomedical studies. Also, existing developmental groups have been economically unable to adequately transfer their work to such smaller installations. In response to this need and through the efforts of the Society of Nuclear Medicine Computer

B. F. Maskewitz; R. L. Henne; W. J. McClain

1976-01-01

485

Tool or Science? The History of Computing at the Norwegian University of Science and Technology  

NASA Astrophysics Data System (ADS)

One may characterize the history of computing at the Norwegian University of Science and Technology by a tension between the computer as a tool in other disciplines and computer science as discipline in itself. This tension has been latent since the pioneering period of the 1950s until today. This paper shows how this have been expressed in the early attempts to take up computing at the University, and how it gave the Division of Computer Science a fairly rough start when it opened in 1972.

Nordal, Ola

486

Speckle noise reduction by changing sampling size in digital holography  

NASA Astrophysics Data System (ADS)

Holography is a 3D imaging method. In digital holography, like classical holography, speckle noise presents in reconstruction process and reduces the image quality. Thus, speckle noise reduction has strong effect on the image quality. Because of random distribution of speckle characteristics, it is too hard to eliminate them completely. Up to now some methods have been proposed for speckle noise reduction. In this work a method has been presented which is based on statistical property of speckle noise. By averaging multiple reconstructed images with different speckle noise patterns it has been reduced. These reconstructed images have been acquired by changing the sampling size in the hologram plane.

Rostami, Yadolah; Abolhassani, Mohammad

487

Computer-Aided Analysis of Patents for Product Technology Maturity Forecasting  

NASA Astrophysics Data System (ADS)

Product technology maturity foresting is vital for any enterprises to hold the chance for innovation and keep competitive for a long term. The Theory of Invention Problem Solving (TRIZ) is acknowledged both as a systematic methodology for innovation and a powerful tool for technology forecasting. Based on TRIZ, the state -of-the-art on the technology maturity of product and the limits of application are discussed. With the application of text mining and patent analysis technologies, this paper proposes a computer-aided approach for product technology maturity forecasting. It can overcome the shortcomings of the current methods.

Liang, Yanhong; Gan, Dequan; Guo, Yingchun; Zhang, Peng

488

Computer Based Technology and the Language/Liberal Arts: Stepping into the Electronic Universe.  

ERIC Educational Resources Information Center

The need for the liberal arts curriculum to incorporate new technology in order for education to reach its potential is examined in this paper, which also looks at the potential for computer-based telecommunications to extend continued education for professionals. A survey of applications of computer-based telecommunications in reading and writing…

Adams, Dennis M.

489

Educational Technology and the Restructuring Movement: Lessons from Research on Computers in Classrooms.  

ERIC Educational Resources Information Center

This paper presents findings from a recently completed study of the use of computers in primary classrooms as one source of evidence concerning the role technology can play in school restructuring efforts. The sites for the study were selected by Apple Computer, Inc. in the spring of 1988 and included 43 classrooms in 10 schools in 6 large, mostly…

Kell, Diane; And Others

490

JTEC Panel Report on Human-Computer Interaction Technologies in Japan.  

National Technical Information Service (NTIS)

This report reviews the status of Japanese R&D in human-computer interaction (HCI) technologies and applications. It covers fundamental HCI research; R&D and applications in computer-supported collaborative work (CSCW), information network services and in...

J. D. Foley, E. P. Glinert, J. D. Hollan, R. E. Kraut, T. B. Sheridan, T. Skelly

1996-01-01

491

The Effects of Computer-Assisted Feedback Strategies in Technology Education: A Comparison of Learning Outcomes  

ERIC Educational Resources Information Center

This study investigated the effects of computer-assisted feedback strategies that have been utilized by university students in a technology education curriculum. Specifically, the study examined the effectiveness of the computer-assisted feedback strategy "Knowledge of Response feedback" (KOR), and the "Knowledge of Correct Responses feedback"…

Adams, Ruifang Hope; Strickland, Jane

2012-01-01

492

Evaluation of Two Different Teaching Concepts in Dentistry Using Computer Technology  

ERIC Educational Resources Information Center

The common teaching goal of two different phantom head courses was to enable the students to provide an all-ceramic restoration by the means of computer technology. The aim of this study was to compare these two courses with regard to the different educational methods using identical computer software. Undergraduate dental students from a single…

Reich, Sven; Simon, James F.; Ruedinger, Dirk; Shortall, Adrian; Wichmann, Manfred; Frankenberger, Roland

2007-01-01

493

Education/Technology/Power: Educational Computing as a Social Practice. SUNY Series, Frontiers in Education.  

ERIC Educational Resources Information Center

This book is organized in three parts that address the following broad topics related to educational computing: discursive practices, i.e., who speaks of educational computing and how (chapters 1-4); classroom practices (chapters 5-6); and democratic possibilities, i.e., the constructive potential of the technology (chapters 7-9). Following an…

Bromley, Hank, Ed.; Apple, Michael W., Ed.

494

Technology Assessment of Computer-Aided-Design in the American Footwear Industry.  

National Technical Information Service (NTIS)

The technology assessment of computer-aided-design (CAD) in the American footwear industry has a two-fold objective: (1) to identify viable applications of computer-aided-design to the footwear industry, and (2) to assess the likely technical, economic, a...

E. E. Sweezy S. J. Hart

1980-01-01

495

Scaling the Digital Divide: Home Computer Technology and Student Achievement. Working Paper 48  

ERIC Educational Resources Information Center

Does differential access to computer technology at home compound the educational disparities between rich and poor? Would a program of government provision of computers to early secondary school students reduce these disparities? The authors use administrative data on North Carolina public school students to corroborate earlier surveys that…

Vigdor, Jacob L.; Ladd, Helen F.

2010-01-01

496

Scaling the Digital Divide: Home Computer Technology and Student Achievement. NBER Working Paper No. 16078  

ERIC Educational Resources Information Center

Does differential access to computer technology at home compound the educational disparities between rich and poor? Would a program of government provision of computers to early secondary school students reduce these disparities? We use administrative data on North Carolina public school students to corroborate earlier surveys that document broad…

Vigdor, Jacob L.; Ladd, Helen F.

2010-01-01

497

The Role of Wireless Computing Technology in the Design of Schools.  

ERIC Educational Resources Information Center

This document discusses integrating computers logically and affordably into a school building's infrastructure through the use of wireless technology. It begins by discussing why wireless networks using mobile computers are preferable to desktop machines in each classoom. It then explains the features of a wireless local area network (WLAN) and…

Nair, Prakash

498

Early Childhood Teachers' Attitudes towards Computer and Information Technology: The Case of Greece  

ERIC Educational Resources Information Center

The purpose of this research was to investigate the attitudes of early childhood teachers towards computers and Information Technology (IT). The study examined whether or not attitudes are differentiated by a series of factors, such as: years of previous service, the use of a computer at home (with Internet access), inservice training, and…

Tsitouridou, Melpomeni; Vryzas, Konstantinos

2003-01-01

499

Computer integrated vision and neural network technologies for intelligent automatic laser butt joint welding  

Microsoft Academic Search

This paper discusses the integrated application of computer vision and neural technologies on laser welding to make welding processes more intelligent and automatic. Computer vision was employed to inspect a welding gap, to measure the welding gap size, and to trace the welding path for laser beam alignment. The NC code for the welding path was generated, and then the

Jeng-ywan Jeng; Tzuoh-fei Mau; Sh Yeu-ming Leu

2000-01-01

500

Integration of Computer Technology Into an Introductory-Level Neuroscience Laboratory  

Microsoft Academic Search

We describe 3 computer-based neuroscience laboratories. In the first 2 labs, we used commercially available interactive software to enhance the study of functional and comparative neuroanatomy and neurophysiology. In the remaining lab, we used customized software and hardware in 2 psychophysiological experiments. With the use of the computer-based technology, we have successfully met our pedagogical objectives while minimizing operating costs

Denise L. Evert; Gregory Goodwin; Amy Jo Stavnezer

2005-01-01