Results 71 to 80 of about 520,939 (335)

Hierarchical Feature Enhancement Algorithm for Multispectral Infrared Images of Dark and Weak Targets

Photonics, 2023
A multispectral infrared zoom optical system design and a single-frame hierarchical guided filtering image enhancement algorithm are proposed to address the technical problems of low contrast, blurred edges, and weak signal strength of single-spectrum ...
Shuai Yang, Zhihui Zou, Yingchao Li, Haodong Shi, Qiang Fu   +4 more
doaj   +1 more source

Experimental investigation of linear-optics-based quantum target detection

, 2019
The development of new techniques to improve measurements is crucial for all sciences. By employing quantum systems as sensors to probe some physical property of interest allows the application of quantum resources, such as coherent superpositions and ...
Aguilar, G. H., Céleri, L. C., de Souza, M. A., Gomes, R. M., Gu, M., Thompson, J., Walborn, S. P.   +6 more
core   +1 more source

Summed Parallel Infinite Impulse Response (SPIIR) Filters For Low-Latency Gravitational Wave Detection [PDF]

, 2011
With the upgrade of current gravitational wave detectors, the first detection of gravitational wave signals is expected to occur in the next decade.
A. V. Oppenheim, David Blair, Jing Luan, L. A. Wainstein, L. R. Rabiner, Linqing Wen, Shaun Hooper, Shin Kee Chung, Yanbei Chen   +8 more
core   +2 more sources

Functional Connectivity Linked to Cognitive Recovery After Minor Stroke

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Patients with minor stroke exhibit slowed processing speed and generalized alterations in functional connectivity involving frontoparietal cortex (FPC). The pattern of connectivity evolves over time. In this study, we examine the relationship of functional connectivity patterns to cognitive performance, to determine ...
Vrishab Commuri, Isabella Dallasta, Ciaran Stone, Sophia Girgenti, Neda Gould, Rafael H. Llinas, Jonathan Z. Simon, Elisabeth Breese Marsh   +7 more
wiley   +1 more source

Enhanced Signal-to-Noise Ratio Estimation in Optical Fiber Communications: A Pilot-Based Approach

IEEE Open Journal of the Communications Society
This paper presents two innovative, pilot-assisted, neural network (NN)-based signal-to-noise ratio (SNR) estimators for application in optical fiber communications.
Mohamed Al-Nahhal, Ibrahim Al-Nahhal, Sunish Kumar Orappanpara Soman, Octavia A. Dobre   +3 more
doaj   +1 more source

Joint Influence of the Optical Carrier-to-Sideband Ratio and Guard Band on Direct-Detection SSB-OOFDM System

IEEE Photonics Journal, 2015
The signal-to-interference-plus-noise ratio of the noised single-sideband optical orthogonal frequency-division multiplexing (SSB-OOFDM) signal in a direct-detection OFDM system is first deduced theoretically.
Jianxin Ma, Wei Zhou
doaj   +1 more source

Real‐World Performance of CSF Kappa Free Light Chains in the 2024 McDonald Criteria

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Kappa free light chains (KFLCs) in the cerebrospinal fluid (CSF) have a similar performance to CSF‐restricted oligoclonal bands (OCB) for multiple sclerosis (MS) diagnosis. To help with implementation, we set out to resolve several remaining uncertainties: (1) performance in a real‐world cohort and the 2024 McDonald criteria; (2 ...
Maya M. Leibowitz, Ryan Cooper, Stefania Kaninia, Kathryn I. Challis, Will Greenway, Maria Bonello, Mahmoud Elbahnasawi, Deborah T. Shode, Dominika Gajdasik, Victor Iliev, Alison M. E. Whitelegg, Ian Galea   +11 more
wiley   +1 more source

Brainstem and Cerebellar Volume Loss and Associated Clinical Features in Progressive Supranuclear Palsy

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Progressive Supranuclear Palsy (PSP) is a neurodegenerative ‘tauopathy’ with predominating pathology in the basal ganglia and midbrain. Caudal tau spread frequently implicates the cerebellum; however, the pattern of atrophy remains equivocal.
Chloe Spiegel, Timothy P. Siejka, Cassandra Marotta, Josh J. Y. Lee, Kelly Bertram, Terence J. O'Brien, Meng Law, Lucy Vivash, Ian H. Harding   +8 more
wiley   +1 more source

Zero Guard Band Multi-Twin-SSB System in Single Fiber Bidirectional PON Transmission

IEEE Access, 2020
We propose a novel zero guard band (ZGB) multi-twin-SSB bidirectional passive optical network system which combines the multiband carrier-less amplitude phase and twin single sideband (SSB) modulation techniques. The multi-twin-SSB signal is generated at
Xiang Gao, Yuancheng Cai, Bo Xu, Faith Kwaku Deynu, Kun Qiu   +4 more
doaj   +1 more source

Power Efficient Communication for Low Signal to Noise Ratio Optical Links

, 2021
Receiver sensitivity is a particularly important metric in optical communication links operating at low signal-to-noise ratios (SNRs), for example in deep-space communication, since it directly limits the maximum achievable reach and data rate. Pulse position modulation (PPM) with direct detection photon-counting detectors are the most power-efficient ...
Kakarla, Ravikiran, Mazur, Mikael, Schröder, Jochen, Andrekson, Peter A.   +3 more
openaire   +2 more sources