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Comparison of a standard gaussian random variable with a steady random variable having an infinite variance

JOURNAL OF COMMUNICATIONS TECHNOLOGY AND ELECTRONICS 2001年第4期46卷 439-442页

作者： Moiseev, SN

It is shown that, using a finite sample, it is impossible to discriminate with a given probability of error between a random variable having an infinite variance and a standard Gaussian random variable. An example is given that illustrates the inconsistency of data processing algorithms in the case when the Gaussian model is erroneously chosen.

关键词： Random variable Gauss Infinite Variance processing algorithm

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Ultrasonic detection using wideband discrete wavelet transform

Ultrasonic detection using wideband discrete wavelet transfo...

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IEEE Region 10 International Conference on Electrical and Electronic Technology

作者： Lam, FK Leung, CK Univ Hong Kong Dept Elect & Elect Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0780371011

This paper describes the design of a wideband spatial processor for the detection of a straight-line object by an ultrasonic pulse-echo detection system. An ultrasonic pulse is transmitted from the transducer and the two wavelets diffracted form the two end points of the straight-line object are received by three spatially separated receivers. Three stages of signal processing are carried out. At the first stage, the Mother Wavelet operator generates three sets of two-dimensional wavelet coefficients. At the second stager cross wavelet transforms are performed on wavelet coefficients obtained in the first stage. At the third stage, cross wavelet transforms are performed on cross wavelet coefficients obtained in the second stage: As a result of this three-stage operation, a high-resolution image about the environment is generated and the range and bearing of the two end points of the straight-line object are obtained. A simulation program is developed to investigate the processing algorithm in an ultrasonic detection environment.

关键词： ultrasonic flaw detection Wavelet coefficients Straight line two-terminal processing algorithm emulator program broadband discrete wavelet transform wavelet transforms Transducers

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Raw/SLC signal simulator for spaceborne interferometric SAR systems

Raw/SLC signal simulator for spaceborne interferometric SAR ...

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IEEE International Geoscience and Remote Sensing Symposium

作者： De Vita, F Mori, A Univ Florence Dip Elettron & Telecommun I-50139 Florence Italy

ISBN: (纸本)0780363590

(Interferometric) SAR signal simulation is very useful to test processing algorithms of real data. A simulator can provide a reliable version of signals received by a particular system, when the geometric and the electromagnetics characteristics of targets are fixed. In this paper we present a simulator for an interferometric (single-pass) SAR system placed on a spaceborne platform moving over an ideal Kepler's orbit. Stripmap and spotlight operational mode can be considered, and, by describing system geometry in a platform frame of reference, mechanical deformation of structures can be easily modeled.

关键词： simulator signals processing algorithm Synthetic aperture radar Deformation microstructure operational mode Platform Electromagnetism

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From laboratory to warehouse: Security robots meet the real world

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INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH 1999年第7期18卷 760-768页

作者： Everett, HR Gage, DW Space & Naval Warfare Syst Ctr San Diego CA 92152 USA

The Mobile Detection Assessment and Response System robotic security program has successfully demonstrated simultaneous control of multiple robots navigating autonomously within an operational warehouse environment. This real-world warehouse installation required adapting a navigational paradigm designed for highly structured environments such as office corridors (with smooth walls and regularly spaced doorways) to a semistructured warehouse environment (with no exposed walls and within which odd-shaped objects unpredictably move about from day to day). A number of challenges, some expected and others unexpected, were encountered during the transfer of the system first to a beta-test/demonstration site and then to an operational warehouse. This paper examines these problems (and others previously encountered) in a historical context of the evolution of navigation and other needed technologies, and the transition of these technologies from the research lab to an operational,warehouse environment. A key lesson is that system robustness can only be ensured by exhaustively exercising the system's operational capabilities in a number of diverse environments. This approach helps to uncover latent system hardware deficiencies and software implementation errors not manifested in the initial system hardware or initial development environment, and to identify sensor modes or processing algorithms tuned too tightly to the specific characteristics of the initial development environment.

关键词： security robot Environments simultaneous control Cooperating robots WAREHOUSE processing algorithm

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Processes are in the eye of the beholder

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THEORETICAL COMPUTER SCIENCE 1997年第1-2期179卷 333-351页

作者： Lamport, L DIGITAL EQUIPMENT CORP 130 LYTTON AVE PALO ALTO CA 94304 USA

A two-process algorithm is shown to be equivalent to an N-process one, illustrating the insubstantiality of processes. A. formal equivalence proof (in TLA the Temporal Logic of Actions) is sketched.

关键词： Action Eye indium Equivalent Temporal logic Tea processing algorithm Trinidad lake asphalt

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Simulation of MSGC signals and application to the front-end electronics for LHC experiments

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 1997年第1-3期392卷 109-114页

作者： Clergeau, JF Contardo, D Haroutunian, R Mirabito, L Smadja, G INST PHYS NUCL 43 BD 11 NOVEMBRE 1918 F-69622 VILLEURBANNE FRANCE

We present a simulation of the signal delivered by minimum ionising particles crossing an MSGC. The parameters, adjusted to the experimental data, are reported for different gas mixtures. The simulation is then applied to the study of the bunch crossing identification at LHC. We present the performance of different pulse shapings and processing algorithms in the LHC environment.

关键词： Gas counter DIRECTLY IONIZING PARTICLES INDIRECTLY IONIZING PARTICLES Large Hadron Collider Electronics gas mixture Experimental data simulating signals crossing processing algorithm

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Length determination of DNA fragments in Atomic Force Microscope images

Length determination of DNA fragments in Atomic Force Micros...

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International Conference on Image processing

作者： Spisz, TS DCosta, N Seymour, CK Hoh, JH Reeves, R Bankman, IN Johns Hopkins Univ Applied Physics Lab Laurel United States

ISBN: (纸本)0818681837

A processing algorithm was developed to detect and determine the lengths of DNA fragments in Atomic Force Microscope images. The algorithm was designed to account for varying image conditions, fragment sizes, and background contamination, while minimizing processing time to provide high throughput. Although a large enough sample of images has not been tested yet to determine precisely the accuracy, we estimate accuracy to be within 2 pixels based on analysis of an ideal simulated image and an actual image.

关键词： Atomic Force Microscopy microscope image DNA processing time analog image processing algorithm Fragments

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The SpectrumWare approach to wireless signal processing

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WIRELESS NETWORKS 1996年第1期2卷 1-12页

作者： Tennenhouse, David L. Bose, Vanu G. MIT Comp Sci Lab Telemedia Networks & Syst Grp Cambridge MA 02139 USA

The SpectrumWare project is applying a software oriented approach to wireless communication and distributed signal processing. Advances in processor and analog-to-digital conversion technology have made it possible to implement virtual radios that directly sample wide bands of the RF spectrum and process these samples in application software. The elimination of dedicated hardware introduces tremendous flexibility into a wireless communication system. Our approach goes further than the software implementation of traditional signal processing functions. We use processor and network memory to temporally decouple the sample streams from the software modules so that the bulk of the processing can be realized within virtual time programming environments. Decoupling relaxes the temporal constraints on the processing algorithms and their execution. This paper describes the SpectrumWare concept, our experimental approach, and the implications that this approach has for wireless signal processing algorithms.

关键词： PROCESSOR software module DECOUPLING signal processing software implementation radiofrequency spectra Applications software Wireless communication systems wireless CARRIER SYSTEM processing algorithm

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Parallel geophysical processing

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Leading Edge (Tulsa, OK) 1996年第12期15卷 1359-1359页

作者： Perkins, Wesley Zoll, Richard Brzostowski, Matthew A. PGS Tensor Inc. Houston TX United States

The use of massively parallel processors (MPP) systems is becoming more widespread in the seismic industry as it begins to take advantage of their strength in solving data processing problems. Today it is common for 3-D prestack depth migration and other computer or I/O intensive processes to be run on such platforms. This paper outlines how we have adapted to MPP in order to run our seismic processing algorithms as efficiently as possible.

关键词： RUN-ON Parallel Lines mangion-purified polysaccharide (Candida albicans) geophysics Earthquakes processing algorithm IO massively parallel processors order

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A new digital surround processing system for general A/V sources

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 1995年第4期41卷 1174-1180页

作者： Choi, Y Han, S Lee, D Sung, K LG ELECTR IMAGE & MEDIA LABSEOUL 137140SOUTH KOREA

A new surround processing algorithm is proposed for the sensible reproduction of nbn-encoded conventional stereo sources as well as Dolby encoded ones. The proposed method synthesizes the additional sound channels to expand the output from the conventional two channels to four or five. The directivity of auditory events is enhanced by the direction enhancement algorithm whose performance can be optimized to both cases of Dolby encoded and non-encoded sources. Also, spectral balance among the channels is tuned up to minimize the defects arising from processes such as coloration of timbre. A surround processing system based on the proposed method was implemented using a custom DASP chip and showed a much satisfactory performance for the various non-encoded sources as well as Dolby encoded sources.

关键词： Timbre WELLS processing algorithm directivity Sound channels color tones Output 2-channel

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