1,511 research outputs found
Three-Dimensional System-in-Package Using Stacked Silicon Platform Technology
No full textIn this paper, a novel method of fabricating three– dimensional (3-D) system-in-package (SiP) using a silicon carrier that can integrate known good dice with an integrated cooling solution is presented. The backbone of this stacked module is the fabrication of a silicon carrier with through-hole conductive interconnects. The design, process, and assembly to fabricate silicon through-hole interconnect using a wet silicon etching method is discussed in this paper. The process optimization to fabricate silicon carriers with solder through-hole interconnect within the design tolerance has been achieved. The design and modeling methodology to optimize the package in terms of electrical aspects of the stacked module is carried out to achieve less interconnect parasitics. An integrated cooling solution for 3-D stacked modules using single-phase and two-phase cooling solutions is also demonstrated for high-power applications. Known good thin flip-chip devices with daisy chain are fabricated and attached to the silicon carrier by flip-chip processes making it a known good carrier after electrical testing. Individual known good carriers are vertically integrated to form 3-D Si
On the tail decay of M/G/1-type Markov renewal processes
No full textThe tail decay of M/G/1-type Markov renewal processes is studied. The Markov
renewal process is transformed into a Markov chain so that the problem of
tail decay is reformulated in terms of the decay of the coefficients of a
suitable power series. The latter problem is reduced to analyze the
analyticity domain of the power series
Correspondence with Rao Bahadur M. Vaidyanathan (Madras) J
No full textuly 1934 – October 1938, June 1958. 26 letters, some with enclosures
Real-time implementation of a non-invasive tongue-based human-robot interface
No full textReal-time implementation of an assistive human-machine interface system based around tongue-movement ear pressure (TMEP) signals is presented, alongside results from a series of simulated control tasks. The implementation of this system into an online setting involves short-term energy calculation, detection, segmentation and subsequent signal classification, all of which had to be reformulated based on previous off-line testing. This has included the formulation of a new classification and feature extraction method. This scheme utilises the discrete cosine transform to extract the frequency features from the time domain information, a univariate Gaussian maximum likelihood classifier and a two phase cross-validation procedure for feature selection and extraction. The performance of this classifier is presented alongside a real-time implementation of the decision fusion classification algorithm, with each achieving 96.28% and 93.12% respectively. The system testing takes into consideration potential segmentation of false positive signals. A simulation mapping commands to a planar wheelchair demonstrates the capacity of the system for assistive robotic control. These are the first real-time results published for a tongue-based human-machine interface that does not require a transducer to be placed within the vicinity of the oral cavity.<br/
sj-pdf-1-aut-10.1177_13623613211014990 – Supplemental material for A preliminary randomized, controlled trial of executive function training for children with autism spectrum disorder
No full textSupplemental material, sj-pdf-1-aut-10.1177_13623613211014990 for A preliminary randomized, controlled trial of executive function training for children with autism spectrum disorder by Susan Faja, Tessa Clarkson, Rachel Gilbert, Akshita Vaidyanathan, Gabriella Greco, M Rosario Rueda, Lina M Combita and Kate Driscoll in Autism</p
Segmenting Mechanomyography Measures of Muscle Activity Phases Using Inertial Data
No full textThis dataset contains the data used in our manuscript titled "Segmenting Mechanomyography Measures of Muscle Activity Phases Using Inertial Data". Data structure is explained in the README.txt file located at the top-level of the dataset. Manuscript title in the README.txt file and contained in the title of the zip file are of a previous working title. Please contact corresponding author Richard B. Woodward for any questions.</span
In-ear microphone speech data segmentation and recognition using neural networks
No full textSpeech collected through a microphone placed in front of the mouth has been the primary source of data collection for speech recognition. However, this set-up also picks up any ambient noise present at the same time. As a result, locations which may provide shielding from surrounding noise have also been considered. This study considers an ear-insert microphone which collects speech from the ear canal to take advantage of the ear canal noise shielding properties to operate in noisy environments. Speech segmentation is achieved using short-time signal magnitude and short-time energy-entropy features. Cepstral coefficients extracted from each segmented utterance are used as input features to a back-propagation neural network for the seven isolated word recognizer implemented. Results show that a backpropagation neural network configuration may be a viable choice for this recognition task and that the best average recognition rate (94.73%) is obtained with mel-frequency cepstral coefficients for a two-layer networ
Emission Band Change of (Sr1-xMx)(3)SiO5:Eu2+ (M=Ca, Ba) Phosphor for White Light Sources Using Blue/Near-Ultraviolet LEDs
No full textThe luminescence properties of orange-yellow-emitting Eu2+-activated Sr3SiO5 were optimized for application to blue/near ultraviolet (n-UV) light-emitting diodes (LEDs). Sr2.97SiO5:Eu-0.03(2+) showed strong orange-yellow emission peaking at similar to 580 nm under blue and n-UV light of 450 and 405 nm, respectively, and the effects of Ca and Ba substitutions into Sr2+ sites on the emission band change were investigated. For the substitution of Ca, Ca3SiO5:Eu2+ showed no orange-yellow emission under blue light due to the different crystal structures of Ca3SiO5 (monoclinic) and Sr3SiO5 (tetragonal). The redshift and blueshift of the emission band of (Sr1-xBax)(3)SiO5:Eu2+ were explained by the competition between crystal field effect and Nephelauxetic effect. The 460 nm-emitting blue LED-pumped white LED with Sr3SiO5:Eu2+ or a mixture of Sr3SiO5:Eu2+ and green phosphor (Ba2SiO4:Eu2+) were fabricated and they showed color coordinates of (0.343, 0.281) and (0.349, 0.339), respectively.This work was supported by the Center for Electronic Packaging Materials (ERC) of MOST/KOSEF
Characterization of TLB and page allocation behavior on modern processors
No full textVirtual memory support is prevalent in most modern processors and is facilitated through Translation Lookaside Buffers (TLBs) which play a major role in the overall system performance. TLB misses are costly since they require multiple high latency memory references to walk the page table and locate the desired Virtual Page Number (VPN) - Physical Page Number (PPN) mapping. This study improves TLB hit rates by taking advantage of any contiguity present in the pages allocated by the Operating System (OS). By contiguity we refer to cases where consecutive VPNs are mapped to consecutive PPNs. Traditionally, OSs use large or superpages to collapse hundreds of such contiguous entries, thereby using one TLB entry to represent them rather than hundreds of entries they would normally require. Unfortunately due to implementation complexities superpaging has not been universally successful in reducing TLB pressure. We show, however, that even without explicit superpaging, various OS virtual memory allocation activities lead to intermediate levels of contiguity that may be exploited to coalesce TLB entries and significantly improve hit rates. We verify the presence of contiguity by running benchmarks on a real system and checking the page allocations of the OS. The OS page allocation schemes depend on memory pressure and memory defragmentation daemons. Further, we find an average contiguity of 30 pages over all the benchmarks and configurations with superpaging turned on and about 10 with superpaging turned off. To verify the performance of a Coalesced TLB we have implemented a fully associative TLB with variable size and Least Recently Used (LRU) replacement policy. Our results show an average hit rate improvement of 25% by adding an 8-16 entry fully associative Coalesced TLB. The Coalesced TLB further needs no complex hardware to implement, hence providing to a low cost means to reduce miss rates.M.S.Includes bibliographical referencesby Viswanathan Vaidyanatha
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