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31.
Stephanie A C Schuckers Natalia A Schmid Aditya Abhyankar Vivekanand Dorairaj Christopher K Boyce Lawrence A Hornak 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》2007,37(5):1176-1190
The popularity of the iris biometric has grown considerably over the past two to three years. Most research has been focused on the development of new iris processing and recognition algorithms for frontal view iris images. However, a few challenging directions in iris research have been identified, including processing of a nonideal iris and iris at a distance. In this paper, we describe two nonideal iris recognition systems and analyze their performance. The word "nonideal" is used in the sense of compensating for off-angle occluded iris images. The system is designed to process nonideal iris images in two steps: 1) compensation for off-angle gaze direction and 2) processing and encoding of the rotated iris image. Two approaches are presented to account for angular variations in the iris images. In the first approach, we use Daugman's integrodifferential operator as an objective function to estimate the gaze direction. After the angle is estimated, the off-angle iris image undergoes geometric transformations involving the estimated angle and is further processed as if it were a frontal view image. The encoding technique developed for a frontal image is based on the application of the global independent component analysis. The second approach uses an angular deformation calibration model. The angular deformations are modeled, and calibration parameters are calculated. The proposed method consists of a closed-form solution, followed by an iterative optimization procedure. The images are projected on the plane closest to the base calibrated plane. Biorthogonal wavelets are used for encoding to perform iris recognition. We use a special dataset of the off-angle iris images to quantify the performance of the designed systems. A series of receiver operating characteristics demonstrate various effects on the performance of the nonideal-iris-based recognition system. 相似文献
32.
The focus of this article is to review recent techniques in proteomic analysis of ocular fluids. These fluids include tears, aqueous humor, and vitreous, they will also be compared to serum analysis. Furthermore, we attempt to summarize some disease correlated biomarkers in ocular fluids that were discovered through different proteomic techniques in eye diseases like dry eye, glaucoma, age-related macular degeneration, uveitis, or diabetic retinopathy. This review is trying to point out the importance of these biomarkers for clinical applications. 相似文献
33.
Emotions have a political dimension in that judgments regarding when and how emotion should be felt and shown are interpreted in the interests of regulating the organization and functioning of social groups. This article argues that claims to authenticity and legitimacy of one's self-identity or group identity are at stake in the everyday politics of emotion. A brief discussion of the study of sex differences in the 19th century illustrates how emotion politics can saturate even scientific inquiry. Three ways in which there is a political dimension to socially appropriate emotion in contemporary life are then discussed: (a) Is the emotion the "wrong" emotion for the situation? (b) How are competing standards for emotional experience and expression managed? and (c) What constitutes the boundary between "too much" and "too little" emotion? The author concludes by considering the relevance of emotion politics to research on emotion. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
34.
Schopp Laura H.; Johnstone Brick; Reid-Arndt Stephanie 《Canadian Metallurgical Quarterly》2005,36(2):158
Rural psychologists are frontline primary behavioral health care providers for nearly 60 million Americans, but they face limited access to peer consultation and continuing education. This article describes a program that matched 70 rehabilitation inpatients who had new brain injury with rural clinicians from patients' home communities. Neuropsychologists provided one-on-one training for clinicians through telehealth video teleconferencing. Clinicians showed gains in brain injury knowledge, and clients rated trained providers higher than untrained providers. Families seeking brain injury services can connect with these trained rural providers through a Web site, which receives more than 800 hits per month. Telehealth offers potential for rural clinicians to receive support, reduce professional isolation, gain working knowledge of specialty conditions, and deliver high-quality services for their rural clients. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
35.
A real-time vision module for interactive perceptual agents 总被引:2,自引:0,他引:2
Bruce A. Maxwell Nathaniel Fairfield Nikolas Johnson Pukar Malla Paul Dickson Suor Kim Stephanie Wojtkowski Thomas Stepleton 《Machine Vision and Applications》2003,14(1):72-82
Abstract. Interactive robotics demands real-time visual information about the environment. Real-time vision processing, however, places
a heavy load on the robot's limited resources, which must accommodate multiple other processes running simultaneously. This
paper describes a vision module capable of providing real-time information from ten or more operators while maintaining at
least a 20-Hz frame rate and leaving sufficient processor time for a robot's other capabilities. The vision module uses a
probabilistic scheduling algorithm to ensure both timely information flow and a fast frame capture. In addition, it tightly
integrates the vision operators with control of a pan-tilt-zoom camera. The vision module makes its information available
to other modules in the robot architecture through a shared memory structure. The information provided by the vision module
includes the operator information along with a time stamp indicating information relevance. Because of this design, our robots
are able to react in a timely manner to a wide variety of visual events. 相似文献
36.
Infant rats exhibit sensitive-period odor learning characterized by olfactory bulb neural changes and odor preference acquisitions critical for survival. This sensitive period is coincident with low endogenous corticosterone (CORT) levels and stress hyporesponsivity. The authors hypothesized that low corticosterone levels modulate sensitive-period learning. They assessed the effects of manipulating CORT levels by increasing and removing CORT during (Postnatal Day 8) and after (Postnatal Day 12) the sensitive period. Results show that (a) exogenous CORT prematurely ends sensitive-period odor-shock-induced preferences; (b) adrenalectomy developmentally extends the sensitive period as indicated by odor-shock-induced odor-preference learning in older pups, whereas CORT replacement can reinstate fear learning; and (c) CORT manipulation modulates olfactory bulb correlates of sensitive-period odor learning in a manner consistent with behavior. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
37.
This research examined whether parents' and children's perceptions of one another have reciprocal self-fulfilling effects on each other's behavior. Parents and their adolescent children completed self-report surveys and engaged in dyadic videotaped interaction tasks. The surveys assessed mothers', fathers', and children's perceptions of their own and the other's hostility and warmth. Observers coded the videotaped interactions to assess the actual hostility and warmth exhibited by parents and children. Data from 658 mother-child dyads were consistent with the conclusion that children had a self-fulfilling effect on their mothers' hostility but that mothers did not have a reciprocal self-fulfilling effect on their children's hostility. No other self-fulfilling prophecy effects emerged. Findings are discussed in terms of family relations and the differential power of negative versus positive self-fulfilling prophecies. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
38.
Ngunjiri JN Kelley AT LeJeune ZM Li JR Lewandowski BR Serem WK Daniels SL Lusker KL Garno JC 《Scanning》2008,30(2):123-136
Nanografting is a high-precision approach for scanning probe lithography, which provides unique advantages and capabilities for rapidly writing arrays of nanopatterns of thiol self-assembled monolayers (SAMs). Nanografting is accomplished by force- induced displacement of molecules of a matrix SAM, followed immediately by the self-assembly of n-alkanethiol ink molecules from solution. The feedback loop used to control the atomic force microscope tip position and displacement enables exquisite control of forces applied to the surface, ranging from pico to nanonewtons. To achieve high-resolution writing at the nanoscale, the writing speed, direction, and applied force need to be optimized. There are strategies for programing the tip translation, which will improve the uniformity, alignment, and geometries of nanopatterns written using open-loop feedback control. This article addresses the mechanics of automated nanografting and demonstrates results for various writing strategies when nanografting patterns of n-alkanethiol SAMs. 相似文献
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