162 research outputs found
On the MDS Condition of Blaum-Bruck-Vardy Codes With Large Number Parity Columns
No full textBinary maximum distance separable (MDS) array codes are widely used in storage systems. EVENODD code and row-diagonal parity (RDP) code are two well-known binary MDS array codes with two parity columns. The Blaum-Bruck-Vardy (BBV) code is an extension of the double-erasure-correcting EVENODD code. It is known that the BBV code is always MDS for three parity columns, and sufficient conditions for up to eight parity columns to be MDS are also known. However, the MDS condition for more than eight parity columns is an open problem since then. In this letter, we study the MDS condition of BBV code and give a sufficient MDS condition of the BBV code with more than eight parity columns.National Basic Research Program of China [2012CB315904, SZJCYJ20150331100723974, SZJCYJ20140417144423192, S2013020012822]; University Grants Committee of the Hong Kong Special Administrative Region, China [AoE/E-02/08]; Research Grants Council of the Hong Kong Special Administrative Region, China [CUHK14209515]SCI(E)[email protected]
Stereo-imaging sensor position localization method and system
No full textThe disclosure relates to a method and system wherein sensors on a cap or directly disposed on a head can be localized using a stereo camera. By capturing a plurality of stereo images, the positions of the sensors can be determined with respect to each other. At least a first stereo image having a first set of sensors and a second stereo image having a second set of sensors are captured in a first position respectively a second position of the stereo camera relative to the cap by a relative rotation of the stereo camera around the cap. The first set of sensors and the second set of sensors may have one or more sensors in common. The relative rotation of the stereo camera around the cap can be obtained by at least one of a rotation of the stereo camera around a non-rotating cap and a rotation of the cap with respect to a fixed stereo camera.Biomechanical EngineeringMechanical, Maritime and Materials Engineerin
Terms of Enjoyment 2.0: Measuring Patron Use of Public Library Services
No full textThis paper suggests a model for design education that aims at re-adjusting the reliance on disciplinary boundaries to solve “wicked problems.
Cross-age Kindergarten Peer-Assisted Learning Strategies: The Impact on Tutors' and Tutees; Reading, Perceptions of Academic Self and Exploratory Talk
No full textEvaluation of a Cognitive Behavioural Intervention (ThinkSmart) to Engage Young People into Higher Education
No full textThe optimisation of the energy-related cost function for the Delft Shoulder & Elbow Model
No full textFor inverse-dynamic models cost functions account for the load sharing problem that arises when modelling the musculoskeletal system. This study focuses on the optimisation of the energy-related cost function integrated in the Delft Shoulder & Elbow Model and compares the translation of the obtained representation to results from in vitro measurements. An existing data set containing electromyography (EMG) recordings of elbow flexors (m. biceps brachii, m. brachialis and m. brachioradialis) and extensors (m. triceps brachii and m. anconeus) was used. A grid search was performed over a range of [1, 120] for b¬1 and [1, 60] for b2. The overall explained variance was calculated for each cost function, classifying the particular muscles in flexion and/or extension tasks where activity is expected. For the comparison to in vitro measurements the ratio of contraction dynamics and activation dynamics described by the cost function was determined under varying degree of force production over all muscles used for the analysis. Optimal weight factors were obtained for b1 = 3 and b2 = 50. The contribution of the contraction dynamics compared to the activation dynamics was 60% at 50% of its maximal force generation and 78% at maximal force generation which compares to the in vitro measurements.BMBioMechanical EngineeringMechanical, Maritime and Materials Engineerin
Design and analysis of spherical codes
No full text"A spherical code is a finite set of points on the surface of a multidimensional unit radius sphere. This thesis gives two constructions for large spherical codes that may be used for channel coding and for source coding. The first construction ""wraps"" a finite subset of any sphere packing onto the unit sphere in one higher dimension. The second construction is similar to the recursive construction of laminated lattices. Both constructions result in codes that are asymptotically optimal with respect to minimum distance, and the first construction can be efficiently used as part of a vector quantizer for a memoryless Gaussian source. Both constructions are structured so that codepoints may be identified without having to store the entire codebook. For several different rates, the distortion performance of the proposed quantizer is better than previously published results of quantizers with equivalent complexities."The construction techniques are motivated by the relationship between asymptotically large spherical codes and sphere packings in one lower dimension. It is shown that the asymptotically maximum density of a k-dimensional spherical code equals the maximum density of a sphere packing in \IR\sp{k-1}. Similar relationships hold for the quantization coefficient and covering thickness. Previously published upper and lower bounds on the size of spherical codes of given minimum distances are analyzed and shown to be loose for asymptotically small minimum distances.Made available in DSpace on 2011-05-07T12:54:22Z (GMT). No. of bitstreams: 2
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Previous issue date: 1996Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T14:47:34Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:21:29-05:00
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Research and Evaluation: Beyond Booked Up (BBU):Investigating the Delivery and Impact of BBU
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