Image filtering in sampled dynamic infrared scene projection systems is examined from the point of view of providing an improved insight into the choice of the pixel mapping ratio between the projector and imaging uni...
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ISBN:
(纸本)0819424994
Image filtering in sampled dynamic infrared scene projection systems is examined from the point of view of providing an improved insight into the choice of the pixel mapping ratio between the projector and imaging unit-under-test. The two-dimensional vector analysis underlying the transfer of image information in such systems is reviewed and is applied to the dynamic infrared scene projection case. it is shown that the 4:1 (2 x 2 : 1) pixel mapping ratio previously recommended is a desirable criterion from the spatial fidelity viewpoint, particularly when high spatial frequency information represented by point sources and scene edges is being projected. Cost constraints can, however, prevent the 4:1 mapping ratio from being met, in which case the effects on hardware-in-the-loop simulation validity need to be examined carefully. The vector analysis presented here provides a tool useful for the future examination of such cases.
File prefetching is an effective technique for improving file access performance. In this paper, we present a file prefetching mechanism that is based on on-line analytic modeling of interesting system events and is t...
In this paper a new method for two dimensional complex wave reconstruction is developed by measurement of three dimensional intensity in a first order optical system under partially coherent illumination. The system i...
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ISBN:
(纸本)0819425923
In this paper a new method for two dimensional complex wave reconstruction is developed by measurement of three dimensional intensity in a first order optical system under partially coherent illumination. The system includes two cylindrical lenses oriented along two perpendicular axes in a plane perpendicular to the propagation axis. When the parameters of the two dimensional lens system are set to satisfy the conditions of fractional Fourier transform independently in both dimensions, the input complex wave can be determined by measurements of intensities in a set of planes, and the mutual intensity is calculated through integrals of distributional coordinates and the fractional orders of fractional Fourier transform. As a result, the case of partially coherent illumination of Gaussian Schell-model is studied. In the numerical simulation it is found that phase structure in the input plane might be retrieved by this method in this system. The approach may provide an alternative way of recovering the phase object.
The proceedings contain 32 papers. The special focus in this conference is on Distributed Programming Languages, Distributed Objects Environments and Collaboration Support Systems. The topics include: A simple legal a...
ISBN:
(纸本)354063343X
The proceedings contain 32 papers. The special focus in this conference is on Distributed Programming Languages, Distributed Objects Environments and Collaboration Support Systems. The topics include: A simple legal arrangement for sharing, re-use, and republication of copyrighted material on the net;building secure and reliable network applications;distributed execution of java programs;performance of the messengers autonomous-objects-based system;engineering component-based systems with distributed object technology;local class name space facility for worldwide object-oriented distributed systems environment;a component-oriented architecture to design multimedia services on a distributed platform;teamwork via team plans in intelligent autonomous agent systems;a web information sharing system accessible via the www;organic programming for cooperative computation;emerging groupware successes in major corporations;an approach toward fits evaluation between organizational culture and groupware;a realization of a reflection of personal information on distributed brainstorming environment;a hybrid approach to multimedia database systems through integration of semantics and media-based search;the universal b-tree for multidimensional indexing;spatial views and LOD-based access control in VRML-object databases;metacomputing and data-intensive applications;architectural issues of database systems in advanced computer networks;www cache management and its international deployment;distributed algorithms for a web based distributed network management system;an algorithm for cost-delay balanced trees and its application to wide area network multicast and server initiated delivery of multimedia information.
The proceedings contain 31 papers. The special focus in this conference is on Financial Cryptography. The topics include: Anonymity control in e-cash systems;how to make personalized web browsing simple, secure, and a...
ISBN:
(纸本)9783540635949
The proceedings contain 31 papers. The special focus in this conference is on Financial Cryptography. The topics include: Anonymity control in e-cash systems;how to make personalized web browsing simple, secure, and anonymous;tools for anonymous corporations;unlinkable serial transactions;efficient electronic cash with restricted privacy;the SPEED cipher;evaluating the security of electronic money;electronic cash--technology will denationalise money;fault induction attacks, tamper resistance, and hostile reverse engineering in perspective;some critical remarks on “dynamic data authentication” as specified in EMV ’96;single-chip implementation of a cryptosystem for financial applications;perspectives on financial cryptography;auditable metering with lightweight security;a flexible micropayment scheme;an efficient micropayment system based on probabilistic polling;on the continuum between on-line and off-line e-cash systems - I;towards multiple-payment schemes for digital money;applying anti-trust policies to increase trust in a versatile e-money system;the uses and limits of financial cryptography;legal issues in cryptography;digital signatures today;an attorney’s roadmap to the digital signature guidelines;alternative visions for legal signatures and evidence;past, present and future;electronic lottery tickets as micropayments;strategic tasks for government in the information age;using electronic markets to achieve efficient task distribution;the gateway security model in the java electronic commerce framework;highly scalable on-line payments via task decoupling;grand unified meta-protocols recipes for simple, standards-based financial cryptography and secure network communications and secure store & forward mechanisms with the SAP R/3 system.
We investigate the in-flight dynamics of a simplified model of a supercavitating body. In particular we are interested in the nature and frequency of the impacts which occur as the tail of the body touches the cavity ...
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