19,911 research outputs found
DRAM energy reduction by prefetching-based memory traffic clustering
No full textDRAMs consume a large portion of total system energy consumption. Thus, reducing DRAM energy consumption is able to prolong the lifetime of battery-operated embedded/portable systems. To this end, we propose DRAM energy-aware data prefetching scheme to lengthen DRAM idle periods by clustering DRAM accesses. Low-power modes of DRAMs can better exploit longer idle times. We performed experiments with a cycle-accurate simulator with built-in DRAM power model. The experimental results show that our proposed DRAM-aware prefetching is effective in reducing DRAM energy consumption. Up to 77% and average 59% of DRAM energy consumption is saved
SimTag: Exploiting tag bits similarity to improve the reliability of the data caches
No full textThough tag bits in the data caches are vulnerable to transient errors, few effort has been made to reduce their vulnerability. In this paper, we propose to exploit prevalent same tag bits to improve error protection capability of the tag bits in the data caches. When data are fetched from the main memory, it is checked if adjacent cache lines have the same tag bits as those of the data fetched. This similarity information is stored in the data caches as extra bits to be used later. When an error is detected in the tag bits, the similarity information is used to recover from the error in the tag bits. The proposed scheme has small area, energy, and performance overheads with error protection coverage of 97.9% on average. In contrast, the previously proposed InCache Replication scheme is shown to incur large performance and energy overheads
Porous Gold-Silver Alloy Nanoparticles for Photoacoustic Signal Enhancement
No full textPhotoacoustic(PA) imaging is an emerging tool that can solve the traditional problems of optical imaging such as imaging depth and resolution. Using the acoustic waves generated in response to the absorption of pulsed laser light, PA imaging can provide non-invasive images of live species. In addition, PA imaging shows several centimeters of penetration depth and a few hundred micrometers of resolution, due to lower scattering of acoustic waves in tissue than photons. Because of these advantages, PA imaging shows great potentials for clinical research and application. Au nanostructures are suitable contrast agents because of their high extinction coefficient, thermal conversion efficiency and biocompatibility.
In this work, we synthesized porous AuAg alloy nanoparticles(NPs) for PA contrast agent with large surface area, which is advantageous in terms of thermal conduction and heat conversion. Porous AuAg alloy NPs were synthesized by galvanic replacement reaction from silver nanocubes. All synthetic procedures were observed by TEM images and absorption spectra. Acoustic signal increase was confirmed in the 680-800 nm NIR region compared to gold nanorods with the similar absorption cross-section in solution, for phantom gel and small animal level. Especially, 24 times increase of PA signal was observed in solution. This result shows that surface area of contrast agents is important for thermal conversion efficiency for PA signal. Our porous AuAg alloy NPs can be a platform for many applications, in addition to the PA imaging contrast, such as drug delivery vehicle, which suits well for future theranostic applications.1
Electro-Photoluminescence Color Changing System for Interactive Display and Deformable Visual Encryption
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NIR-II emitting quantum dots for multiplex in vivo imaging and light-sheet imaging
No full textQuantum dots (QDs) emitting at the second near-infrared region (NIR-II; wavelength = 1000–1700 nm) offer unique opportunities as a deep tissue penetrating probe. NIR-II light provides enhanced spatial resolution (~10 μm) through deep tissue due to suppressed photon scattering and near-zero autofluorescence. It affords facile and multiplexed modalities, and QDs can have bright and wavelength-tunable photoluminescence at NIR-II. PbS/CdS (Core/Shell) QDs were sophisticatedly prepared to have sufficient brightness and narrow fluorescence bandwidth to allow multiplexing at NIR-II. A polymer encapsulation technique provided the QDs with long-term fluorescence stability over a week in biological media and offered simple bioconjugations. As a proof-of-concept experiment, two NIR-II QD probes were prepared as two-color multiplexed imaging probes, and a home-built NIR-II imaging setup provided multiplexed and nearly real-time longitudinal whole-body level in vivo imaging. Mixture solution of the two NIR-II QDs was intravenously injected to a tumor-xenografted mouse model and the NIR-II signals from the two channels were longitudinally observed, which empowered simultaneous and direct comparison of the tumor targeting ability for QDs with targeting moiety over the unconjugated control QDs. In addition, three-dimensional images were obtained and analyzed by home-built NIR-II light-sheet imaging setup.1
Who Was Edmund Lee?
No full textLocal author Peggy Donoho discusses her pioneer ancestor, Edmund Lee, and her work to preserve their family cemetery
The Future of Canadian Climate Policy — with Marc Lee
No full textMarc Lee is a Senior Economist at the Canadian Centre for Policy Alternatives\u27 BC Office. In addition to tracking federal and provincial budgets and economic trends, Marc has published on a range of topics from poverty and inequality to globalization and international trade to public services and regulation. Marc is the Co-Director of the Climate Justice Project, a research partnership with UBC\u27s School of Community and Regional Planning that examines the links between climate change policies and social justice.Resources:Climate Justice Project: www.policyalternatives.ca/projects/cli…tice-projectMarc Lee\u27s Posts on Policy Note: www.policynote.ca/author/marclee/Canadian Centre for Policy Alternatives: www.policyalternatives.ca/Marc\u27s Twitter: twitter.com/MarcLeeCCPA International Panel on Climate Change, 2021 report: www.ipcc.ch/report/ar6/wg1
Dr. Aleksandra Sznajder Lee – Faculty Author Interview
No full textDr. Aleksandra Sznajder Lee, Associate Professor of Political Science, discusses her new book, Transnational Capitalism in East Central Europe’s Heavy Industry, published recently by the University of Michigan Press. Focusing on the steel industry during the post-communist transition from 1989 through 2009, Dr. Sznajder Lee traces the transformation of flagship state enterprises in the Czech Republic, Poland, Romania, and Slovakia into the subsidiaries of large, international corporations
Letter from K.W. Lee to Friends of Michi Weglyn, November 1, 1997
No full textA letter from K. W. (Kyung Won) Lee, an investigative journalist who wrote for the Sacramento Union, to the Friends of Michi Weglyn. Lee wrote that Weglyn was instrumental in the campaign to free Chol Soo Lee, a Korean American man was on death row, but later had his convictions overturned. Lee also wrote that other Japanese American activists were instrumental to the success of this campaign.These materials are from box 73 and 74 of the Frank Chin Papers. The Frank Chin Papers contain personal and professional correspondence between Frank Chin and Michi Weglyn relating to particular projects on which either author was working as well as files related to the Day of Remembrance Tribute to Michi Weglyn
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