792 research outputs found
New Motion Estimation Algorithm and Its Block-Matching Criteria Using Low-Resolution Quantization
We propose a new motion estimation algorithm
and its block-matching criteria using low-resolution
quantization. The proposed algorithm reduces both the huge
computational cost of the full search algorithm and the
performance degradation of the fast algorithms by matching
the low-resolution images. Two search steps called the lowresolution
search and the full-resolution search are employed.
Simulation results show that the PSNR of the proposed
algorithm is superior to those of the 4:1 alternate subsampling
algorithm with less computational cost. Its computational cost
is 1/38.1 of the full search algorithm
Effect of tDCS on aberrant functional network connectivity in refractory hallucinatory schizophrenia: A pilot study
Fast design of reduced complexity nearest-neighbor classifiers using triangular inequality
In this paper, we propose a method of designing a reduced complexity nearest-neighbor (RCNN) classifier with near-minimal computational complexity from a given nearest-neighbor classifier that has high input dimensionality and a large number of class vectors. We applied our method to the classification problem of handwritten numerals in the NIST database. If the complexity of the RCNN classifier is normalized to that of the given classifier, the complexity of the derived classifier is 62 percent, 2 percent higher than that of the optimal classifier. This was found using the exhaustive search.Institute of Information Technology Assessment (IITA), Korea,
under research grant 96060-IT2-I2
The Interaction of Phospholipase C-{beta}3 with Shank2 Regulates mGluR-mediated Calcium Signal
Phospholipase C-{beta} isozymes that are activated by G protein-coupled receptors (GPCR) and heterotrimeric G proteins carry a PSD-95/Dlg/ZO-1 (PDZ) domain binding motif at their C terminus. Through interactions with PDZ domains, this motif may endow the PLC-{beta} isozyme with specific roles in GPCR signaling events that occur in compartmentalized regions of the plasma membrane. In this study, we identified the interaction of PLC-{beta}3 with Shank2, a PDZ domain-containing multimodular scaffold in the postsynaptic density (PSD). The C terminus of PLC-{beta}3, but not other PLC-{beta} isotypes, specifically interacts with the PDZ domain of Shank2. Homer 1b, a Shank-interacting protein that is linked to group I metabotropic glutamate receptors and IP3 receptors, forms a multiple complex with Shank2 and PLC-{beta}3. Importantly, microinjection of a synthetic peptide specifically mimicking the C terminus of PLC-{beta}3 markedly reduces the mGluR-mediated intracellular calcium response. These results demonstrate that Shank2 brings PLC-{beta}3 closer to Homer 1b and constitutes an efficient mGluR-coupled signaling pathway in the PSD region of neuronal synapses
Interoperation of an UHF RFID Reader and a TCP/IP Device via Wired and Wireless Links
A main application in radio frequency identification (RFID) sensor networks is the function that processes real-time tag information after gathering the required data from multiple RFID tags. The component technologies that contain an RFID reader, called the interrogator, which has a tag chip, processors, coupling antenna, and a power management system have advanced significantly over the last decade. This paper presents a system implementation for interoperation between an UHF RFID reader and a TCP/IP device that is used as a gateway. The proposed system consists of an UHF RFID tag, an UHF RFID reader, an RF end-device, an RF coordinator, and a TCP/IP I/F. The UHF RFID reader, operating at 915 MHz, is compatible with EPC Class-0/Gen1, Class-1/Gen1 and 2, and ISO18000-6B. In particular, the UHF RFID reader can be combined with the RF end-device/coordinator for a ZigBee (IEEE 802.15.4) interface, which is a low-power wireless standard. The TCP/IP device communicates with the RFID reader via wired links. On the other hand, it is connected to the ZigBee end-device via wireless links. The web based test results show that the developed system can remotely recognize information of multiple tags through the interoperation between the RFID reader and the TCP/IP device
Frequency-domain implementation of block adaptive filters for ICA-based multichannel blind deconvolution+I3055
In this paper, we present frequency-domain implementations
of two adaptive multichannel blind deconvolution filters
that employ the independent component analysis principle.
The proposed implementations achieve considerable
computational gains, which is shown by performing detailed
analysis on the computational complexity. Particularly,
our implementations incorporate a nonholonomic constraint
to deal with overdetermined cases. The developed
algorithms were successfully applied to the blind separation
of real-world speech signals
The Effects of d_{x^2-y^2}-d_{xy} Mixing on Vortex Structures and Magnetization
The structure of an isolated single vortex and the vortex lattice, and the
magnetization in a -wave superconductor are investigated within a
phenomenological Ginzburg-Landau (GL) model including the mixture of the
-wave and -wave symmetry. The isolated single vortex
structure in a week magnetic field is studied both numerically and
asymptotically. Near the upper critical field , the vortex lattice
structure and the magnetization are calculated analytically.Comment: 14 pages, REVTeX, 2 EPS figures, Journal of Physics: Condensed Matter
(in press
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