1,013 research outputs found
dim-sim
No full textThe dim-sim dataset is a collection of user-annotated music similarity triplet ratings used to evaluate music similarity search and related algorithms. Our similarity ratings are linked to the Million Song Dataset (MSD) and were collected for the following paper:
Disentangled Multidimensional Metric Learning for Music Similarity
Jongpil Lee, Nicholas J. Bryan, Justin Salamon, Zeyu Jin, and Juhan Nam.
Proceedings of the International Conference on Acoustics, Speech, and Signal Processing (ICASSP). IEEE, 2020.
@inproceedings{Lee2019MusicSimilarity,
title={Disentangled Multidimensional Metric Learning For Music Similarity},
author={Lee, Jongpil and Bryan, Nicholas J. and Salamon, Justin and Jin, Zeyu, and Nam, Juhan},
booktitle={Proceedings of the International Conference on Acoustics, Speech and Signal Processing (ICASSP)},
year={2020},
organization={IEEE}
}
We kindly request that articles and other works in which this dataset is used cite the paper as listed above.
Please see our paper or visit https://jongpillee.github.io/multi-dim-music-sim for more information
A simple disc wind model for broad absorption line quasars
No full textApproximately 20 per cent of quasi-stellar objects (QSOs) exhibit broad, blue-shifted absorption lines in their ultraviolet spectra. Such features provide clear evidence for significant outflows from these systems, most likely in the form of accretion disc winds. These winds may represent the ‘quasar’ mode of feedback that is often invoked in galaxy formation/evolution models, and they are also key to unification scenarios for active galactic nuclei (AGN) and QSOs. To test these ideas, we construct a simple benchmark model of an equatorial, biconical accretion disc wind in a QSO and use a Monte Carlo ionization/radiative transfer code to calculate the ultraviolet spectra as a function of viewing angle. We find that for plausible outflow parameters, sightlines looking directly into the wind cone do produce broad, blue-shifted absorption features in the transitions typically seen in broad absorption line (BAL) QSOs. However, our benchmark model is intrinsically X-ray weak in order to prevent overionization of the outflow, and the wind does not yet produce collisionally excited line emission at the level observed in non-BAL QSOs. As a first step towards addressing these shortcomings, we discuss the sensitivity of our results to changes in the assumed X-ray luminosity and mass-loss rate, Ṁwind. In the context of our adopted geometry, Ṁwind ∼ Ṁacc is required in order to produce significant BAL features. The kinetic luminosity and momentum carried by such outflows would be sufficient to provide significant feedback
Alpha particle spectroscopy using FNTD and SIM super-resolution microscopy
No full textStructured illumination microscopy (SIM) for the imaging of alpha particle tracks in fluorescent nuclear track detectors (FNTD) was evaluated and compared to confocal laser scanning microscopy (CLSM). FNTDs were irradiated with an external alpha source and imaged using both methodologies. SIM imaging resulted in improved resolution, without increase in scan time. Alpha particle energy estimation based on the track length, direction and intensity produced results in good agreement with the expected alpha particle energy distribution. A pronounced difference was seen in the spatial scattering of alpha particles in the detectors, where SIM showed an almost 50% reduction compared to CLSM. The improved resolution of SIM allows for more detailed studies of the tracks induced by ionising particles. The combination of SIM and FNTDs for alpha radiation paves the way for affordable and fast alpha spectroscopy and dosimetry. Journal compilatio
Triangular Constellations in Flows
No full textParticles advected on the surface of a fluid can exhibit fractal clustering. The local structure of a fractal set is described by its dimension , which is the exponent of a power-law relating the mass in a ball to its radius : . It is desirable to characterise the {\em shapes} of constellations of points sampling a fractal measure, as well as their masses. The simplest example is the distribution of shapes of triangles formed by triplets of points, which we investigate for fractals generated by chaotic dynamical systems. The most significant parameter describing the triangle shape is the ratio of its area to the radius of gyration squared. We show that the probability density of has a phase transition: is independent of and approximately uniform below a critical flow compressibility , which we estimate. For the distribution appears to be described by two power laws: when , and when
Design and statistical analysis of observational studies
No full text[No abstract available]Austin PC, 2008, STAT MED, V27, P2037, DOI 10.1002-sim.3150; Awwad J, 2012, BJOG-INT J OBSTET GY, V119, P1379, DOI 10.1111-j.1471-0528.2012.03438.x; Hansen BB, 2008, STAT MED, V27, P2050, DOI 10.1002-sim.3208; Hill J, 2008, STAT MED, V27, P2055, DOI 10.1002-sim.3245; Stuart EA, 2008, STAT MED, V27, P2062, DOI 10.1002-sim.32070
Alternative approaches to multilevel modelling of survey non-contact and refusal
No full textWe review three alternative approaches to modelling survey non-contact and refusal: multinomial, sequential, and sample selection (bivariate probit) models. We then propose a multilevel extension of the sample selection model to allow for both interviewer effects and dependency between non-contact and refusal rates at the household and interviewer level. All methods are applied and compared in an analysis of household non-response in the United Kingdom, using a data set with unusually rich information on both respondents and non-respondents from six major surveys. After controlling for household characteristics, there is little evidence of residual correlation between the unobserved characteristics affecting non-contact and refusal propensities at either the household or the interviewer level. We also find that the estimated coefficients of the multinomial and sequential models are surprisingly similar, which further investigation via a simulation study suggests is due to non-contact and refusal having largely different predictor
Gauduchon-Tod structures, Sim holonomy and de Sitter supergravity
No full textSolutions of five-dimensional De Sitter supergravity admitting Killing spinors are considered, using spinorial geometry techniques. It is shown that the null solutions are defined in terms of a one parameter family of 3-dimensional constrained Einstein-Weyl spaces called Gauduchon-Tod structures. They admit a geodesic, expansion-free, twist-free and shear-free null vector field and therefore are a particular type of Kundt geometry. When the Gauduchon-Tod structure reduces to the 3-sphere, the null vector becomes recurrent, and therefore the holonomy is contained in Sim(3), the maximal proper subgroup of the Lorentz group SO(4,1). For these geometries, all scalar invariants built from the curvature are constant. Explicit examples are discussed. © SISSA 2009.Brannlund J, 2008, CLASSICAL QUANT GRAV, V25, DOI 10.1088-0264-9381-25-19-195007; Cacciatori SL, 2007, J HIGH ENERGY PHYS; Calderbank DMJ, 2001, DIFFER GEOM APPL, V14, P199, DOI 10.1016-S0926-2245(01)00037-7; Cardoso V, 2004, PHYS REV D, V70, DOI 10.1103-PhysRevD.70.024002; Cohen AG, 2006, PHYS REV LETT, V97, DOI 10.1103-PhysRevLett.97.021601; Coley A, 2009, CLASSICAL QUANT GRAV, V26, DOI 10.1088-0264-9381-26-10-105016; Coley A, 2009, CLASSICAL QUANT GRAV, V26, DOI 10.1088-0264-9381-26-12-125011; Coley AA, 2008, CLASSICAL QUANT GRAV, V25, DOI 10.1088-0264-9381-25-14-145017; Dunajski M, 2001, DIFFER GEOM APPL, V14, P39, DOI 10.1016-S0926-2245(00)00037-1; Gauduchon P, 1998, J GEOM PHYS, V25, P291, DOI 10.1016-S0393-0440(97)00032-6; GAUDUCHON P, 1984, MATH ANN, V267, P495, DOI 10.1007-BF01455968; Gauntlett JP, 2003, CLASSICAL QUANT GRAV, V20, P4587, DOI 10.1088-0264-9381-20-21-005; Gauntlett JP, 2003, PHYS REV D, V68, DOI 10.1103-PhysRevD.68.105009; Gauntlett JP, 2004, PHYS REV D, V70, DOI 10.1103-PhysRevD.70.089901; Gibbons GW, 2007, PHYS REV D, V76, DOI 10.1103-PhysRevD.76.081701; Gibbons GW, 2008, CLASSICAL QUANT GRAV, V25, DOI 10.1088-0264-9381-25-12-125015; Gillard J, 2005, CLASSICAL QUANT GRAV, V22, P1033, DOI 10.1088-0264-9381-22-6-009; Gran U, 2007, J HIGH ENERGY PHYS; Gran U, 2008, J HIGH ENERGY PHYS; Gran U, 2005, CLASSICAL QUANT GRAV, V22, P2453, DOI 10.1088-0264-9381-22-12-010; Gran U, 2007, J HIGH ENERGY PHYS; Gran U, 2007, J HIGH ENERGY PHYS; Grover J, 2009, AIP CONF PROC, V1122, P129, DOI 10.1063-1.3141231; Grover J, 2008, J HIGH ENERGY PHYS; Grover J, 2009, NUCL PHYS B, V809, P406, DOI 10.1016-j.nuclphysb.2008.08.024; GUTOWSKI JB, ARXIV09030179; JONES PE, 1985, CLASSICAL QUANT GRAV, V2, P565, DOI 10.1088-0264-9381-2-4-021; KUNDT W, 1961, Z PHYS, V163, P77, DOI 10.1007-BF01328918; LUKIERSKI J, 1985, PHYS LETT B, V151, P382, DOI 10.1016-0370-2693(85)91659-4; Meessen P, 2009, J HIGH ENERGY PHYS, DOI 10.1088-1126-6708-2009-05-042; Nariai H., 1950, Science Reports of the Tohoku University, First Series, V34; Nariai H., 1951, Science Reports of the Tohoku University, First Series, V35; PILCH K, 1985, COMMUN MATH PHYS, V98, P105, DOI 10.1007-BF01211046; Podolsky J, 2009, CLASSICAL QUANT GRAV, V26, DOI 10.1088-0264-9381-26-10-105008; Skenderis K, 2006, PHYS REV LETT, V96, DOI 10.1103-PhysRevLett.96.191301; STEPHANI H, 2003, EXACT SOLUTIONS EINS, pCH31; TOD KP, 1992, J LOND MATH SOC, V45, P34114151
Efficient Communication in Robust Multi-agent Reinforcement Learning: Trading Observational Robustness for Fewer Communications
No full textReinforcement learning, especially deep reinforcement learning, has made many advances in the last decade. Similarly, great strides have been made in multi-agent reinforcement learning. Systems of cooperative autonomous robots are increasingly being used, for which multi-agent reinforcement learning can be used as a training method. However, the curse of dimensionality remains a problem for the computational speed of the learning algorithm and the bandwidth of communication channels. This research will focus mainly on reducing the problem of overloading communication channels by trying to reduce the number of communications. This is possible since it is usually unnecessary for every agent to communicate with every other agent constantly. To do this, we use some ideas by Daniel Jarne Ornia. The first is to reduce communications in a multi-agent reinforcement learning system by treating it as an event-triggered control problem. This method uses so-called robustness surrogates as an equivalent to a Lyapunov function to determine if a communication can be skipped without decreasing the performance more than some tolerance. The second is a method to increase the observational robustness of a policy by using lexicographic reinforcement learning. We aim to combine these ideas and trade the additional observational robustness for decreased communications. We also want to test whether additional observational robustness can help mitigate the sim-to-real gap. We implement this method for the multi-agent deep deterministic policy gradient algorithm and perform tests on a variant of the predator-prey domain in increasingly more realistic simulations. We found that the combination of this robust policy and the robustness surrogates method does enable the agents to achieve the same return while communicating less. Unfortunately, our research shows that the observational robustness obtained using lexicographic reinforcement learning, does not help mitigate the sim-to-real gap.Double degree in Systems and Control and Robotics at Delft University of Technology https://github.com/J-deGooijer/Efficient-Communication-in-Robust-Multi-agent-Reinforcement-Learning GitHub repositoryMechanical Engineering | Systems and ControlMechanical Engineering | Vehicle Engineering | Cognitive Robotic
A cooperative cellular and broadcast conditional access system for Pay-TV systems
No full textThis is the author's accepted manuscript. The final published article is available from the link below. Copyright @ 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.The lack of interoperability between Pay-TV service providers and a horizontally integrated business transaction model have compromised the competition in the Pay-TV market. In addition, the lack of interactivity with customers has resulted in high churn rate and improper security measures have contributed into considerable business loss. These issues are the main cause of high operational costs and subscription fees in the Pay-TV systems. As a result, this paper presents the Mobile Conditional Access System (MICAS) as an end-to-end access control solution for Pay-TV systems. It incorporates the mobile and broadcasting systems and provides a platform whereby service providers can effectively interact with their customers, personalize their services and adopt appropriate security measurements. This would result in the decrease of operating expenses and increase of customers' satisfaction in the system. The paper provides an overview of state-of-the-art conditional access solutions followed by detailed description of design, reference model implementation and analysis of possible MICAS security architectures.Strategy & Technology (S&T) Lt
Functional characterization of the ribosome biogenesis factors PES, BOP1, and WDR12 (PeBoW), and mechanisms of defective cell growth and proliferation caused by PeBoW deficiency in Arabidopsis
No full textThe nucleolar protein pescadillo (PES) controls biogenesis of the 60S ribosomal subunit through functional interactions with Block of Proliferation 1 (BOP1) and WD Repeat Domain 12 (WDR12) in plants. In this study, we determined protein characteristics and in planta functions of BOP1 and WDR12, and characterized defects in plant cell growth and proliferation caused by a deficiency of PeBoW (PES-BOP1-WDR12) proteins. Dexamethasone-inducible RNAi of BOP1 and WDR12 caused developmental arrest and premature senescence in Arabidopsis, similar to the phenotype of PES RNAi. Both the N-terminal domain and WD40 repeats of BOP1 and WDR12 were critical for specific associations with 60S/80S ribosomes. In response to nucleolar stress or DNA damage, PeBoW proteins moved from the nucleolus to the nucleoplasm. Kinematic analyses of leaf growth revealed that depletion of PeBoW proteins led to dramatically suppressed cell proliferation, cell expansion, and epidermal pavement cell differentiation. A deficiency in PeBoW proteins resulted in reduced cyclin-dependent kinase Type A activity, causing reduced phosphorylation of histone H1 and retinoblastoma-related (RBR) protein. PeBoW silencing caused rapid transcriptional modulation of cell-cycle genes, including reduction of E2Fa and Cyclin D family genes, and induction of several KRP genes, accompanied by down-regulation of auxin-related genes and up-regulation of jasmonic acid-related genes. Taken together, these results suggest that the PeBoW proteins involved in ribosome biogenesis play a critical role in plant cell growth and survival, and their depletion leads to inhibition of cell-cycle progression, possibly modulated by phytohormone signaling. © 2016 The Author 2016. Published by Oxford University Press on behalf of the Society for Experimental Biology6
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