Results 211 to 220 of about 68,807 (272)

Development of a dynamic pulsatile phantom for the photoplethysmographic waveform at the radial artery. [PDF]

J Biomed Opt
Boonya-Ananta T, Rodriguez AJ, Ajmal A, Sanchez AN, Pei J, Rodriguez E, Vasallo Veliz A, Suastegui C, Paz N, Ramella-Roman JC.   +9 more
europepmc   +1 more source

Comprehensive Review of Open-Source Fundus Image Databases for Diabetic Retinopathy Diagnosis. [PDF]

Sensors (Basel)
Conquer V, Lambolais T, Andrade-Miranda G, Magnier B.   +3 more
europepmc   +1 more source

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Disc defect classification for optical disc drives

IEEE Transactions on Consumer Electronics, 2005
Optical disc drives are subject to various disturbances and faults. A special type of fault is the so-called disc defect. In this paper we present an approach for disc defect classification. It is based on hierarchical clustering of measured signals that are affected by disc defects. The timeseriesare mapped into a feature space after which the feature
Helvoirt, van, J., Leenknegt, G.A.L., Steinbuch, M., Goossens, H.J.   +3 more
openaire   +2 more sources

Digital Servo IC for Optical Disc Drives

IFAC Proceedings Volumes, 2000
Abstract This paper addresses the use of PID regulators to achieve some of the main control goals in an optical disc drive: (i) focusing of the laser spot on the disc surface, (ii) tracking the continuous data spiral during playback, and (iii) radially searching the target location on disc during an access procedure.
Ton H Akkermans, Sorin G Stan
openaire   +1 more source

Optical Disc for Small Form Factor Optical Drive

Japanese Journal of Applied Physics, 2005
We investigated the signal characteristics of a 46 mm small optical disk in a blue laser system [laser wavelength, 405 nm; numerical aperture (NA), 0.85]. To determine the physical dimensions of the rim area of the disk, we considered some factors affecting this rim area.
Myong-do Ro, Kyung-geun Lee, Chang-min Park, Hee-sung Park, In-sik Park   +4 more
openaire   +1 more source

Optical Disc Drives: A Study of Variation

Nonlinear Optics, 2011
Optical disc drives vary significantly in their performance. Here we report a principal components analysis performed on data from new drives, which separates out the better performing drives and finds correlations among drive test variables.
Guilin Jiang, Barry M. Lunt, Travis Niederhauser, Matthew Linford   +3 more
openaire   +1 more source

Miniaturized Optical Pickup and Mechanism for Mobile Optical Disc Drive

Japanese Journal of Applied Physics, 2004
Recently, the market for portable instruments has been increasing markedly. If a very small optical disc drive can be realized, it is expected that a new market for memories will be created, because the running cost of an optical disc is very low. The main issues in such realization are miniaturization of a loading mechanism with a disc cartridge ...
Mitsuhiro Togashi, Takayuki Sasaoka, Ho-Cheol Lee, Ho-Seop Jeong   +3 more
openaire   +1 more source

Development of integrated optical pickup for small form factor optical disc drive

SPIE Proceedings, 2006
To generate the small sized optical pickup for high recording capacity, integrated optical pickup (IOP) corresponding to blu-ray disc specifications has been developed. The development of the IOP includes the design, fabrication, and evaluation of objective lens unit, silicon optical bench design and fabrication, and the evaluation process of focus ...
null Jin-Seung Sohn, null Eun-Hyoung Cho, null MyungBok Lee, null Hae-Sung Kim, null Sung-Dong Suh, null Sung-Mook Kang, null No-Cheol Park, null Young-pil Park   +7 more
openaire   +1 more source