3,454 research outputs found
Architecture Design and Hardware Implementation of LK Optical Flow
No full textDue to rapid advances of machine learning and computer vision, object track recognition and tracking are fundamental technologies in many applications, including the popular advanced driver assisted systems (ADAS). Optical flow is widely used to compute the motion vectors during object tracking. There are two major optical algorithms: HS (Horn and Schunk) and LK (Lucas and Kanade). Although optical flow has been implemented in software library such as OpenCV, the speed performance is usually not satisfactory in many applications that require real-time processing speed, such as in ADAS. In this thesis, we propose hardware implementations of LK optical flow algorithm considering the trade-off between area cost, speed, and accuracy. A low-cost simplified divider used in the optical flow hardware is presented with reduced computation accuracy. Furthermore, we propose a data partition and computation method to reduce the memory requirement in the pyramid optical flow hardware
Asymptotic normality of the Lk-error of the Grenander estimator
Full text linkWe investigate the limit behavior of the Lk-distance between a decreasing density f and its nonparametric maximum likelihood estimator \u88 fn for k ? 1. Due to the inconsistency of \u88 fn at zero, the case k = 2.5 turns out to be a kind of transition point.We extend asymptotic normality of the L1-distance to the Lk-distance for 1 ? k 1, we show that the Lk-distance between f and \u88 fn is asymptotically equivalent to the Lk-distance between Un and g.Delft Institute of Applied MathematicsElectrical Engineering, Mathematics and Computer Scienc
(One Less) Manifesto for a Theatre of Immanence
No full textThis chapter provides an introduction to the complex notion of 'immanence' as it appears in the work of Gilles Deleuze before going on to explore the implications of this concept for performance practice. In parallel, the chapter also includes a manifesto for an immanent performance practice, including images created by the author
Functional and transcriptional analyses of a fengycin synthetase gene, fenC, from Bacillus subtilis.
No full textTransposon mutagenesis and cloning of the genes encoding the enzymes of fengycin biosynthesis in Bacillus subtilis.
No full textSynthesis and characterisation of LK-99
Full text linkRecently, two arXiv preprints (arXiv:2307.12008, arXiv:2307.12037) reported
signatures of superconductivity above room temperature (SART) and at ambient
pressure, striking worldwide experimental research efforts in replicating the
results3-6, as well as theoretical attempts to explain the purported
superconductivity7-11. The material of interest has chemical formula
PbCu(PO)O, where , and was named by the
authors as LK-99. It belongs to lead apatite family, and was synthesised from
two precursors, lanarkite (PbSOPbO) and copper phosphide (CuP).
Here we performed a systematic study on LK-99, starting from solid-state
synthesis, followed by characterisation and transport measurements. We did not
observe any signatures of superconductivity in our samples of LK-99
Construction of Tn917ac1, a transposon useful for mutagenesis and cloning of Bacillus-subtilis genes.
No full textComparison of the face alignment using LK, LK+NN and our methods on real images.
No full text(a) Template with annotated landmarks. (b) Target image with initial shape parameter. (c) The results of Lucas-Kanade method. (d) The results of LK method with the nearest neighbor search. (e) The results of our method, which is Lucas-Kanade method with KPP search (K = 4).</p
New Delay-Partitioning LK-Functional for Stability Analysis with Neutral Type Systems
No full textThis paper investigates the stability issues associated with neutral-type delay systems. Firstly, the delay-partitioning method is employed to construct a brand-new LK-functional candidate. The discrete delay and a neutral delay are divided into several piecewise points through a relaxable sequence of constant numbers, are increasing at a steady rate and are not larger than 1. Secondly, to fully use the interconnection information among the delayed state vectors, a new LK-functional is constructed. Thirdly, the recently published single/multiple integral inequalities are employed to bound the derivative of the newly developed LK function. Finally, a novel stability criterion for neutral systems is developed based on the above treatment. Furthermore, a new corollary is also proposed for the condition of τ=h. The benefits and productivities of our method are demonstrated by numerical examples
Investigation into the nature behind the interesting half levitation behavior of claimed superconductor LK-99
Full text linkA recent article published by Lee et.al. claimed to have successfully
achieved superconductivity at room temperature (RT) has become a topical issue.
Besides the research paper, Lee and his team provided a demonstration video of
LK-99 half levitating (HL) on a magnet. Such interesting HL appearance has
drawn tremendous sensation both in academia and the network. However, the true
identity of LK-99 still remains unclear, i.e., whether the HL behavior can
necessarily indicate the diamagnetism behavior of the sample. Here, we
fabricated our own LK-99 samples following the procedures reported by Lee et
al. We found quite a few sample pieces showing the typical HL that is similar
to those reported. Meanwhile, oxidation during the sample preparation was found
to deleterious to acquiring HL in the sample, while furnace cooling or water
quenching in the last step revealed little effect. However, our careful
observations indicated that those HL pieces are more likely simple
ferromagnetic. Then we conducted a comprehensive study on the behavior patterns
of typical diamagnetism and ferromagnetic substances interacting with a
Nd2Fe14B magnet, and provided instructions to distinguish the characteristics
between ferromagnetic and diamagnetic to prevent misunderstanding of LK-99 like
levitation behavior
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