
	Where results make sense

Topic: Detection theory

In the News (Fri 17 Feb 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Signal Detection Theory
		Classical and modern signal detection theories are critiqued from the viewpoint of determination of jointly sufficient statistics of the parameters of the likelihood functions.
		Comparative analysis of the detection performance as function of the signal base between the generalized detectors and the optimal and asymptotic optimal detectors of classical and modern theories is carried out.
		The decision function used for a definition of the threshold as applied to signal detection based on the generalized approach to signal detection theory is determined.
	www.ici.ro /ici/revista/sic2001_4/art10.html (1147 words)

	Detection theory - Wikipedia, the free encyclopedia
		Detection theory (or signal detection theory) is a means to quantify the ability to discern between signal and noise.
		The concept is similar to the signal to noise ratio used in the sciences, and it is also usable in alarm management, where it is important to separate important events from background noise.
		According to the theory, there are a number of psychological determiners of how we will detect a signal, and where our threshold levels will be.
	en.wikipedia.org /wiki/Detection_theory (183 words)

	Receiver operating characteristic - Wikipedia, the free encyclopedia
		In signal detection theory, a receiver operating characteristic ( ROC) is a graphical plot of the sensitivity vs. 1- specificity for a binary classifier system as its discrimination threshold is varied.
		ROC curves are used to evaluate the results of a prediction and were first employed in the study of discriminator systems for the detection of radio signals in the presence of noise in the 1940s.
		In the 1960s they began to be used in psychophysics, to assess human (and occasionally animal) detection of weak signals.
	en.wikipedia.org /wiki/Receiver-operator_characteristic (576 words)

	UMCP ENEE 621 Indepth Course Description (Site not responding. Last check: 2007-10-02)
		The objective of this course is to introduce the student to the fundamental concepts of estimation and detection theory.
		Detection of known signals in noise: signal-to-noise ratio criterion.
		Detection of signals with unknown parameters: deterministic and random parameters.
	www.ee.umd.edu /Academic/Grad/Gindepth/enee621.html (310 words)

	Olympus FluoView Resource Center: Theory of Confocal Microscopy
		Spectral Bleed-Through Artifacts in Confocal Microscopy - The spectral bleed-through of fluorescence emission (often termed crossover or crosstalk), which occurs due to the very broad bandwidths and asymmetrical spectral profiles exhibited by many of the common fluorophores, is a fundamental problem that must be addressed in both widefield and laser scanning confocal fluorescence microscopy.
		The phenomenon is usually manifested by the emission of one fluorophore being detected in the photomultiplier channel or through the filter combination reserved for a second fluorophore.
		The imaging device is one of the most critical components in fluorescence microscopy because it determines at what level specimen fluorescence may be detected, the relevant structures resolved, and/or the dynamics of a process visualized and recorded.
	www.olympusfluoview.com /theory (2215 words)

	Intrusion Detection, Theory and Practice
		Intrusion detection, is the attempt to monitor and possibly prevent attempts to intrude into or otherwise compromise your system and network resources.
		Detect incoming connection attempts to TCP or UDP ports that are unauthorised, such as attempts to connect to ports where there are no services.
		Most of the intrusion detection tools that I have mentioned are regularly updated to include information about new threats as they are discovered, however it is important to keep up to date with the latest version of these tools.
	www.securityfocus.com /infocus/1203 (3373 words)

	Radiation Detection Theory
		Neutrons can be detected in the same way through the addition of 10 B or 6 Li to the photodiode.
		For low energy (long wavelength) x-ray detection a light gas is required and for high energy (short wavelength) x-rays a heavy gas is needed.
		With three concentric electrodes it is possible to have one inter-electrode spacing sensitive to both neutron and gamma radiation (using a boron coating), while the second inter-electrode spacing can be left sensitive to gamma radiation only (by not boron coating these surfaces of the electrodes).
	www.centronic.co.uk /products_detectors_theory.asp (1512 words)

	LookSmart's FindArticles - Gale Encyclopedia of Psychology: Signal detection theory
		Instead, the theory involves treating detection of the stimulus as a decision-making process, part of which is determined by the nature of the stimulus, by how sensitive a person is to the stimulus, and by cognitive factors.
		This person is "detecting" a stimulus, or signal, that is not there because it would be worse to miss the person than to check to see if the individual is there, only to find that the visitor has not yet arrived.
		The basic idea behind signal detection theory is that neurons are constantly sending information to the brain, even when no stimuli are present.
	www.findarticles.com /p/articles/mi_g2699/is_0003/ai_2699000316/print (945 words)

	intrusion detection system - EnterpriseNetworkingPlanet - News, trends and advice for network managers
		An intrusion detection system (IDS) inspects all inbound and outbound network activity and identifies suspicious patterns that may indicate a network or system attack from someone attempting to break into or compromise a system.
		Like a virus detection system, misuse detection software is only as good as the database of attack signatures that it uses to compare packets against.
		In anomaly detection, the system administrator defines the baseline, or normal, state of the network’s traffic load, breakdown, protocol, and typical packet size.
	networking.webopedia.com /TERM/I/intrusion_detection_system.html (688 words)

	[No title] (Site not responding. Last check: 2007-10-02)
		Detection of Continuous Time Signals in Gaussian Noise (3 weeks) A. White noise, Brownian Motion and Stochastic Integrals 1 - (review of EE 643 material) B. Detection of Signals in Additive White Gaussian Noise 3 i.
		The more classical theory of signal detection in continuous time Gaussian noise is presented at the end of this course.
		This section of the course applies some results obtained in the corequisite course EE 643 text_update19990419 schoolElectrical Engineering rec_hours3 objectiveAs an advanced course in Statistical Communications, this course is intended to provide the foundation which is necessary for research and advanced studies in radar, sonar and digital communications systems.
	www.ecn.purdue.edu /courses/data/EE/644 (255 words)

	Detection, Estimation, and Modulation Theory, Part I
		Detection, Estimation, and Modulation Theory, Part I, by Harry L. Van Trees, John Wiley and Sons, 1968.
		It introduced the terms “Detection and Estimation Theory” into the engineering lexicon and led to the introduction of graduate courses at universities throughout the world.
		When Dr. Bell and I have taught Detection and Estimation Theory in recent years we have augmented the material in the text and incorporated additional problems.
	gunston.gmu.edu /demt/demtp1 (411 words)

	Signal Detection Theory
		The starting point for signal detection theory is that nearly all reasoning and decision making takes place in the presence of some uncertainty.
		Signal detection theory provides a precise language and graphic notation for analyzing decision making in the presence of uncertainty.
		Detecting a tumor is hard and there will always be some amount of uncertainty.
	www.cns.nyu.edu /~david/sdt/sdt.html (2667 words)

	Lightning Detection Theory And Method (Site not responding. Last check: 2007-10-02)
		To me, it appeared to be a pure sine wave that was coming across as the averages over a large number of datapoints seemed to level off at a specific number, provided that the "signal" of the static remained constant which is the nature of sine wave signals.
		Theory 1 : A standard static signal is a sinewave, sampling the signal at points and averaging them from moment to moment would approximately be the same if you measured a signals average on a second to second basis.
		Theory 2 : A lightning bolt would "jostle" this average and would give a average value over a timed period that would signifigantly differ from the standard signal.
	jason.mikomi.org /lightning (474 words)

	Color Edge Detection Theory (Site not responding. Last check: 2007-10-02)
		The eigenvector v corresponding to the greater eigenvalue of Q is the direction of maximum change at any given point, and the corresponding eigenvalue l is the square of the change in the magnitude of (r,g,b) in that direction.
		Now, the Canny operator "detects edges at the zero-crossings of the second directional derivative of the smoothed image in the direction of the gradient where the gradient magnitude is above some threshold".
		Thus in the color method outlined above, sqrt(l) * v is the equivalent of Canny's "direction of the gradient." sqrt(l) is the gradient's magnitude; v is its direction.
	graphics.stanford.edu /~jowens/223b/theory.html (151 words)

	OUP: Elementary Signal Detection Theory: Wickens
		Signal detection theory, as developed in electrical engineering and based on statistical decision theory, was first applied to human sensory discrimination about 40 years ago.
		Detection theory has been applied to a host of varied problems (for example, measuring the accuracy of diagnostic systems, survey research, reliability of lie detection tests) and extends far beyond the detection of signals.
		This book is a primer on signal detection theory, useful for both undergraduates and graduate students.
	www.oup.co.uk /isbn/0-19-509250-3 (355 words)

	Amazon.com: Books: Fundamentals of Statistical Signal Processing, Volume 2: Detection Theory (Site not responding. Last check: 2007-10-02)
		This second volume, entitled Fundamentals of Statistical Signal Processing: Detection Theory, is the application of statistical hypothesis testing to the detection of signals in noise.
		Detection based on simple hypothesis testing is described in Chapters 3--5, while that based on composite hypothesis testing (to accomodate unknown parameters) is the subject of Chapters 6--9.
		The opportunity to apply detection theory to sonar and the research support of J. Kelly of the Naval Undersea Warfare Center, J. Salisbury, formerly of the Naval Undersea Warfare Center, and D. Sheldon of the Naval Undersea Warfare Center, Newport, Rhode Island are also greatly appreciated.
	www.amazon.com /exec/obidos/tg/detail/-/013504135X?v=glance (1863 words)

	Detection and Estimation
		The first part of the course introduces statistical decision theory, techniques in hypothesis testing, and their performance analysis.
		The third part is an introduction of large deviation analysis for detection and estimation problems.
		Various applications of detection and estimation theory will be introduced and further explored as part of course projects.
	people.ece.cornell.edu /ltong/ECE564.html (150 words)

	Geometrical Aspects of Detection Theory (ResearchIndex) (Site not responding. Last check: 2007-10-02)
		The natural geometry for detection theory is not Riemannian, with the...
		9 the theory of importance sampling applied to the analysis of..
		4 A Geometry for Detection Theory (context) - Dabak - 1992
	citeseer.ist.psu.edu /102187.html (450 words)

	Analyte Detection Using Polarimetry Theory
		The use of polarimetry for analyte detection has existed for several years primarily for use in the sugar industry.
		Thus, the concentration of an optically active compound can be calculated if we can determine the observed rotation of polarization for the light beam passing through the sample.
		In our research, we utilize this fundamental concept toward the development of a polarimetric system for noninvasive glucose detection in the human body.
	biomed.tamu.edu /obsl/polarimetry.htm (413 words)

	AntiOnline - rootkit detection theory
		Due to the difficulty of detecting rootkits (because they are easily modified), I got to wondering about maybe a different approach to detection/prevention that I hadn't seen covered anywhere.
		When it detects a change, it looks in the dllcache, driver.cab, or the original installation files to see if it is there.
		So in theory, then, as long as my "app" knew where to look for good copies, such as on a cd-rom, or encrypted virtual drive, then it is feasible...not necessarily easy.
	www.antionline.com /printthread.php?threadid=252341 (989 words)

	Negative Interspike Interval Correlations Increase the Neuronal Capacity for Encoding Time-Dependent Stimuli -- Chacron ...
		Accurate detection of sensory input is essential for the survival of a species.
		Detecting external stimuli is essential for an animal to survive in its environment.
		Including the transients leads to a further increase of the mean of the PND with stimulus, which further increases discriminability and, hence, improves further the ROC curve.
	www.jneurosci.org /cgi/content/full/21/14/5328 (5826 words)

	Amazon.co.uk: Books: Signal Detection Theory and Psychophysics (Site not responding. Last check: 2007-10-02)
		Signal detection theory (SDT) is currently enjoying a comeback in visual psychophysics, the study of how we process visual information.
		Either (a) the theory is confirmed, and is in fact true of the world (a hit), (b) the theory is rejected, but is nontheless in fact true (a miss), (c) the theory is confirmed, but is in fact false (a false alarm), or (d) the theory is rejected, and is indeed false (a correct rejection).
		Green and Swets show, with the use of logic theory, and the assumption that noise in human sensory systems is normally distributed about all possible values, how the proportions of a-d can be used to compute a detectability index, d-prime (d'), and a bias (beta).
	www.amazon.co.uk /exec/obidos/ASIN/0932146236 (414 words)

	Signal Detection Theory (Site not responding. Last check: 2007-10-02)
		Signal detection theory is a popular model of sensory processing.
		Its applications can be seen in a variety of domains in our everyday life and often we are involved in decision making processes in which the concepts of signal detection come into play.
		In this tutorial, we will learn about the basic concepts of Signal Detection Theory (SDT), and the vocabulary for basic SDT concepts, including Hits, False Alarms, Criterion, d', and ROC curves.
	www.csulb.edu /org/hfes/sdt.htm (227 words)

	Signal Detection Experiment Instructions (Site not responding. Last check: 2007-10-02)
		Now you will have the opportunity to run a version of the Signal Detection experiment and collect data yourself.
		As you watch this point, a signal (a small fl dot like ".") may appear on the screen for a brief time after a brief randomly-determined period of time.
		Once the trial has run its course, the two buttons marked Signal Detected and No Signal Detected will be enabled, thus marking the end of the trial.
	epsych.msstate.edu /deliberate/sig_det/sigdet_exper1.html (282 words)

	Wiley::Optical Detection Theory for Laser Applications
		Filling a significant gap in the literature, Optical Detection Theory for Laser Applications addresses the theoretical aspects of optical detection and associated phenomenologies, describing the fundamental optical, statistical, and mathematical principles of the modern laser system.
		The book is especially valuable for its extensive treatment of direct detection statistics, which has no analog in radar detection theory and which has never before been compiled in a cohesive manner in a single book.
		Supported by additional comments providing further insights into the physics or mathematics discussed and an extensive list of classic references, Optical Detection Theory for Laser Applications comprises a much-needed reference for the professional scientist or engineer, as well as a solid textbook for advanced students.
	www3.interscience.wiley.com:8100 /WileyCDA/WileyTitle/productCd-0471224111,descCd-description.html?print=true (218 words)

	2d Collision detection theory problem... - GameDev.Net Discussion Forums
		My theory of collision detection on a tile based map is if you move one pixel at a time, if the tile one pixel at any side of you isnt walkable then you dont allow movement.
		Posted - 12/21/2004 7:06:21 PM The collision detection in the download I provided you is just a simple and not very practicle way of doing collision detection but more of a simple "see if you can recreate it and improve on it" type thing.
		I won't get into how your movement is locked into the framerate cus the issue here is the collision detection, but I do want to mention that you will want to change that sooner or later.
	www.gamedev.net /community/forums/topic.asp?topic_id=289612 (1868 words)

Try your search on: Qwika (all wikis)