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2014 SID International Symposium

作者： Johnson, Paul Kim, Joohwan Hoffman, David M. Vargas, Andres Banks, Martin S. UC Berkeley - UCSF Graduate Program in Bioengineering United States University of California Berkeley Vision Science Program 360 Minor Hall Berkeley CA United States Samsung Display Americas Lab San Jose CA United States

We examined the visibility of motion artifacts-judder, motion blur, and edge banding-on a Samsung 240Hz stereoscopic 3D (S3D) OLED display. We determined the relative contributions of the frame rate of the content, update rate of the panel, duty cycle, and flash number. We compared the visibility of artifacts on the Samsung display with those on a 60Hz S3D LCD. Short duty cycles and low flash numbers reduce the visibility of motion artifacts. © 2014 SID.

关键词： Visibility

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Decoding position from multiunit activity using a marked point process filter

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BMC Neuroscience 2015年第1期16卷 1-1页

作者： Xinyi Deng Uri T Eden Daniel F Liu Kenneth Kay Loren M Frank Department of Mathematics and Statistics Boston University Boston MA USA UC Berkeley--UCSF Graduate Program in Bioengineering UCSF San Francisco CA USA Department of Physiology UCSF San Francisco CA USA

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Motion artifacts on 240Hz OLED stereoscopic 3D displays

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Digest of Technical Papers - SID International Symposium 2014年第1期45卷 797-800页

作者： Johnson, Paul Kim, Joohwan Hoffman, David M. Vargas, Andres Banks, Martin S. UC Berkeley UCSF Graduate Program in Bioengineering United States University of California Berkeley Vision Science Program 360 Minor Hall Berkeley CA United States Samsung Display Americas Lab San Jose CA United States

We examined the visibility of motion artifacts - judder, motion blur, and edge banding - on a Samsung 240Hz stereoscopic 3D (S3D) OLED display. We determined the relative contributions of the frame rate of the content, update rate of the panel, duty cycle, and flash number. We compared the visibility of artifacts on the Samsung display with those on a 60Hz S3D LCD. Short duty cycles and low flash numbers reduce the visibility of motion artifacts. © 2014 Society for Information Display.

关键词： Stereo image processing

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Calibrationless parallel imaging reconstruction based on structured low-rank matrix completion

Calibrationless parallel imaging reconstruction based on str...

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作者： Shin, Peter J. Larson, Peder E. Z. Ohliger, Michael A. Elad, Michael Pauly, John M. Vigneron, Daniel B. Lustig, Michael Department of Radiology and Biomedical Imaging University of California at San Francisco San FranciscoCA United States UC Berkeley-UCSF Graduate Program in Bioengineering CA United States Department of Electrical Engineering and Computer Science University of California at Berkeley BerkeleyCA United States Department of Computer Science Technion'Israel Institute of Technology Haifa Israel Magnetic Resonance Systems Research Laboratory Department of Electrical Engineering Stanford University StanfordCA United States

Purpose: A calibrationless parallel imaging reconstruction method, termed simultaneous autocalibrating and k-space estimation (SAKE), is presented. It is a data-driven, coil-by-coil reconstruction method that does not require a separate calibration step for estimating coil sensitivity information. Methods: In SAKE, an undersampled, multichannel dataset is structured into a single data matrix. The reconstruction is then formulated as a structured low-rank matrix completion problem. An iterative solution that implements a projection-ontosets algorithm with singular value thresholding is described. Results: Reconstruction results are demonstrated for retrospectively and prospectively undersampled, multichannel Cartesian data having no calibration signals. Additionally, non-Cartesian data reconstruction is presented. Finally, improved image quality is demonstrated by combining SAKE with wavelet-based compressed sensing. Conclusion: Because estimation of coil sensitivity information is not needed, the proposed method could potentially benefit MR applications where acquiring accurate calibration data is limiting or not possible at all. © 2013 Wiley Periodicals, Inc.

关键词： Compressed sensing

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Single cell western blotting

Single cell western blotting

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17th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2013

作者： Hughes, Alex J. Spelke, Dawn P. Xu, Zhuchen Schaffer, David V. Herr, Amy E. Department of Bioengineering University of California UC Berkeley Berkeley CA United States UC Berkeley-UCSF Graduate Program in Bioengineering UC Berkeley Berkeley CA United States Department of Chemical Engineering UC Berkeley Berkeley CA United States Helen Wills Neuroscience Institute UC Berkeley Berkeley CA United States California Institute for Quantitative Biosciences UC Berkeley Berkeley CA United States

Understanding protein-mediated cell signaling and differentiation processes requires capturing response heterogeneity for single cells in large populations. We report single-cell western blots on standard microscope s... 详细信息

ISBN: (纸本)9781632666246

关键词： Proteins

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55.1:Distinguished Paper: Motion Artifacts on 240Hz OLED Stereoscopic 3D Displays

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SID Symposium Digest of Technical Papers 2014年第1期45卷

作者： Paul Johnson Joohwan Kim David M. Hoffman Andres Vargas Martin S. Banks UC Berkeley – UCSF Graduate Program in Bioengineering University of California Berkeley Vision Science Program 360 Minor Hall Berkeley CA USA Samsung Display Americas Lab San Jose CA USA

We examined the visibility of motion artifacts—judder, motion blur, and edge banding—on a Samsung 240Hz stereoscopic 3D (S3D) OLED display. We determined the relative contributions of the frame rate of the content, update rate of the panel, duty cycle, and flash number. We compared the visibility of artifacts on the Samsung display with those on a 60Hz S3D LCD. Short duty cycles and low flash numbers reduce the visibility of motion artifacts.

关键词： OLED stereoscopic 3D motion perception motion sampling frame rate

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10 Minute western blotting with 54-plex throughput for clinical confirmatory hiv diagnosis in human serum

10 Minute western blotting with 54-plex throughput for clini...

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16th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2012

作者： Hughes, Alex J. Herr, Amy E. UC Berkeley UCSF Graduate Program in Bioengineering United States UC Berkeley Bioengineering United States

ISBN: (纸本)9780979806452

We translate western blotting to a microchip workflow that cuts conventional assay times from 3-18 hours to 10-60 min with up to 5-plex analyte detection and 54-plex channel throughput. An engineered photoactive protein capture matrix with tunable porosity (PACTgel) constitutes 1) a spatially addressable denaturing polyacrylamide gel electrophoresis (SDS-PAGE) separation matrix compatible with mask-based visible light photopatterning and 2) a UV light-toggled protein capture matrix with unprecedented capture efficiency (>75%). We report the first 10 minute western blot consisting of protein sizing and immunoaffinity detection in a single microchannel, and validate a rapid confirmatory HIV diagnostic using human serum. Our capability for rapid confirmatory HIV diagnosis at the point of care has the potential to circumvent the western blotting bottleneck in the current diagnostic pipeline.

关键词： Proteins

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Volitional Phase Control of Neural Oscillations Using a Brain-Machine Interface

Volitional Phase Control of Neural Oscillations Using a Brai...

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International IEEE/EMBS Conference on Neural Engineering

作者： Preeya Khanna Kelvin So Jose M. Carmena UC Berkeley-UCSF Graduate Group in Bioengineering University of California Department of Electrical Engineering and Computer Sciences University of California Department of Electrical Engineering and Computer Sciences and Helen Wills Neuroscience Institute University of California

ISBN: (纸本)9781467319676

Strong oscillations present in local field potential (LFP) recordings at specific frequencies are thought to be correlated with behavior and involved in communication and coordination across brain areas. LFP-based brain-machine-interfaces (BMIs) lay the groundwork for using closed-loop BMIs to study oscillations across brain regions and to test hypotheses about the rigidity of relationships between oscillations. In this study, we demonstrate the first reported use of inter-regional phase differences to control a BMI. In a one-dimensional two target task where phase difference is mapped to cursor velocity, we show that a macaque monkey, implanted with microwire arrays bilaterally is able to control phase extracted from distal electrodes in left motor cortex (M1) and right dorsal pre-motor cortex (PMd) at frequencies of 20 Hz, 31 Hz, and 40 Hz well above chance, but not at 10 Hz and 50 Hz. Our results imply that within the beta band (15-40Hz) in motor cortex and pre-motor cortex, phase relationships can be volitionally controlled.

关键词： Oscillators Electrodes Trajectory Neurons Visualization Testing Educational institutions

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Comparison of Neural Activity During Closed-Loop Control of Spike- or LFP-based Brain-Machine Interfaces

Comparison of Neural Activity During Closed-Loop Control of ...

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International IEEE/EMBS Conference on Neural Engineering

作者： Amy L. Orsborn Kelvin So Siddharth Dangi Jose M. Carmena UC Berkeley-UCSF Graduate Group in Bioengineering University of California Department of Electrical Engineering and Computer Sciences University of California Department of Electrical Engineering and Computer Sciences and Helen Wills Neuroscience Institute University of California

ISBN: (纸本)9781467319676

Brain-machine interfaces (BMIs) have been developed using a variety of neural signals, including neuron action-potentials and local field-potentials (LFPs). However, little is known about the neural dynamics underlying closed-loop BMI control in these systems, and whether they might be shaped by the signal used for control. Better understanding the relationship between neural signals in closed-loop BMI could inform the design of future systems. We analyzed spiking and LFP activity in pre- and primary-motor cortices as a non-human primate performed closed-loop BMI driven by either spiking or LFP signals. Spike- and LFP-based BMI were done on different days. and all comparisons of activity are indirect. Both LFP and spiking activity showed significant task-related modulations in both types of BMI control. However, the neural dynamics varied with the control signal type. LFP signals, in particular, showed more directional modulation when BMI was controlled with LFPs.

关键词： Decoding Firing Frequency modulation Training Educational institutions Frequency conversion

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Advancing next-generation proteomics: A polymer-patterned microchamber enables integration of the distinct protein separations comprising two-dimensional electrophoresis

Advancing next-generation proteomics: A polymer-patterned mi...

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2012 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2012

作者： Tentori, Augusto M. Hughes, Alex J. Herr, Amy E. UC Berkeley/UCSF Joint Graduate Group in Bioengineering BerkeleyCA United States

ISBN: (纸本)9780964002494

We introduce a new microfluidic approach for rapid, integrated two-dimensional electrophoresis (2DE), which uses a fundamentally different design strategy for integrating two the distinct assay stages of isoelectric focusing (IEF) and size-based electrophoretic separations. A novel device microchamber architecture coupled with spatially heterogeneous polymers enables the separated species from the 1st dimension to be transferred for sizing separations without discretization into individual side channels. The carrier ampholyte based pH gradient is confined to the microchamber by incorporating immobilines into the polyacrylamide (PA) gel regions flanking the microchamber. The resulting pH is both linear and stable, with cathodic drifts © 2012 TRF.

关键词： Separation

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