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Results for "Jeff J. Andrews"

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Double Neutron Star Populations and Formation ChannelsApr 29 2019In the past five years, the number of known double neutron stars (DNS) in the Milky Way has roughly doubled. We argue that the observed sample can be split into three distinct sub-populations based on their orbital characteristics: (i) short-period, low-eccentricity ... More
Double Neutron Star Formation: Merger Times, Systemic Velocities, and Travel DistancesApr 12 2019The formation and evolution of double neutron stars (DNS) have traditionally been studied using binary population synthesis. In this work, we take an alternative approach by focusing only on the second supernova (SN) forming the DNS and the subsequent ... More
Wide Binaries in Tycho-{\it Gaia}: Search Method and the Distribution of Orbital SeparationsApr 25 2017We mine the Tycho-{\it Gaia} astrometric solution (TGAS) catalog for wide stellar binaries by matching positions, proper motions, and astrometric parallaxes. We separate genuine binaries from unassociated stellar pairs through a Bayesian formulation that ... More
The Mass Distribution of Companions to Low-Mass White DwarfsNov 29 2014Measuring the masses of companions to single-line spectroscopic binary stars is (in general) not possible because of the unknown orbital plane inclination. Even when the mass of the visible star can be measured, only a lower limit can be placed on the ... More
Wide Binaries in Tycho-Gaia II: Metallicities, Abundances, and Prospects for Chemical TaggingOct 12 2017From our recent catalog based on the first Gaia data release (TGAS), we select wide binaries in which both stars have been observed by the Radial Velocity Experiment (RAVE) or the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST). Using ... More
Did GW170817 harbor a pulsar?May 22 2019If the progenitor of GW170817 harbored a pulsar, then a Poynting flux dominated bow-shock cavity would have been expected to form around the traveling binary. The characteristic size of this evacuated region depends strongly on the spin-down evolution ... More
Evolutionary Channels for the Formation of Double Neutron StarsOct 24 2014Mar 25 2015We analyze binary population models of double-neutron stars and compare results to the accurately measured orbital periods and eccentricities of the eight known such systems in our Galaxy. In contrast to past similar studies, we especially focus on the ... More
Determining Frequentist Confidence Limits Using a Directed Parameter Space SearchMay 11 2012Sep 23 2014We consider the problem of inferring constraints on a high-dimensional parameter space with a computationally expensive likelihood function. We propose a machine learning algorithm that maps out the Frequentist confidence limit on parameter space by intelligently ... More
Validating TGAS wide binaries with Gaia DR2 Radial Velocities and ParallaxesMay 10 2018Featuring greatly improved astrometry and precise radial velocities (RVs), the second data release (DR2) from Gaia affords us a unique opportunity to test the validity of samples of stellar wide binaries. In a previous work, we presented a set of wide ... More
Material Approximation of Data Smoothing and Spline Curves Inspired by Slime MouldMar 11 2015Using a particle model of Physarum displaying emer- gent morphological adaptation behaviour we demonstrate how a minimal approach to collective material computation may be used to transform and summarise properties of spatially represented datasets. We ... More
Real-valued All-Dimensions search: Low-overhead rapid searching over subsets of attributesDec 12 2012This paper is about searching the combinatorial space of contingency tables during the inner loop of a nonlinear statistical optimization. Examples of this operation in various data analytic communities include searching for nonlinear combinations of ... More
Slime Mould Inspired Generalised Voronoi Diagrams with Repulsive FieldsMar 24 2015The giant single-celled amoeboid organism Physarum polycephalum constructs minimising transport networks but can also approximate the Voronoi diagram using two different mechanisms. In the first method Voronoi bisectors are rep- resented by deformation ... More
Emergence of Self-Organized Amoeboid Movement in a Multi-Agent Approximation of Physarum polycephalumNov 30 2012The giant single-celled slime mould Physarum polycephalum exhibits complex morphological adaptation and amoeboid movement as it forages for food and may be seen as a minimal example of complex robotic behaviour. Swarm computation has previously been used ... More
Programmable reconfiguration of Physarum machinesJan 28 2009Plasmodium of Physarum polycephalum is a large cell capable of solving graph-theoretic, optimization and computational geometry problems due to its unique foraging behavior. Also the plasmodium is unique biological substrate that mimics universal storage ... More
Towards Physarum Binary AddersMay 13 2010Plasmodium of \emph{Physarum polycephalum} is a single cell visible by unaided eye. The plasmodium's foraging behaviour is interpreted in terms of computation. Input data is a configuration of nutrients, result of computation is a network of plasmodium's ... More
Average-Case Active Learning with CostsMay 18 2009We analyze the expected cost of a greedy active learning algorithm. Our analysis extends previous work to a more general setting in which different queries have different costs. Moreover, queries may have more than two possible responses and the distribution ... More
Using MOEAs To Outperform Stock Benchmarks In The Presence of Typical Investment ConstraintsSep 15 2011Jan 02 2012Portfolio managers are typically constrained by turnover limits, minimum and maximum stock positions, cardinality, a target market capitalization and sometimes the need to hew to a style (such as growth or value). In addition, portfolio managers often ... More
Computation of the Travelling Salesman Problem by a Shrinking BlobMar 20 2013Mar 25 2013The Travelling Salesman Problem (TSP) is a well known and challenging combinatorial optimisation problem. Its computational intractability has attracted a number of heuristic approaches to generate satisfactory, if not optimal, candidate solutions. In ... More
On electrical correlates of Physarum polycephalum spatial activity: Can we see Physarum Machine in the dark?Dec 08 2010Plasmodium of Physarum polycephalum is a single cell visible by unaided eye, which spans sources of nutrients with its protoplasmic network. In a very simple experimental setup we recorded electric potential of the propagating plasmodium. We discovered ... More
Road planning with slime mould: If Physarum built motorways it would route M6/M74 through NewcastleDec 20 2009Plasmodium of Physarum polycephalum is a single cell visible by unaided eye. During its foraging behaviour the cell spans spatially distributed sources of nutrients with a protoplasmic network. Geometrical structure of the protoplasmic networks allows ... More
Interactive Submodular Set CoverFeb 17 2010May 20 2010We introduce a natural generalization of submodular set cover and exact active learning with a finite hypothesis class (query learning). We call this new problem interactive submodular set cover. Applications include advertising in social networks with ... More
Approximation of Statistical Analysis and Estimation by Morphological Adaptation in a Model of Slime MouldMar 11 2015True slime mould Physarum polycephalum approximates a range of complex computations via growth and adaptation of its proto- plasmic transport network, stimulating a large body of recent research into how such a simple organism can perform such complex ... More
Proceedings of the Twenty-Fifth Conference on Uncertainty in Artificial Intelligence (2009)Jun 13 2012Aug 28 2014This is the Proceedings of the Twenty-Fifth Conference on Uncertainty in Artificial Intelligence, which was held in Montreal, QC, Canada, June 18 - 21 2009.
Common Proper Motion Wide White Dwarf Binaries Selected From The Sloan Digital Sky SurveySep 02 2012Wide binaries made up of two white dwarfs (WDs) receive far less attention than their tight counterparts. However, our tests using the binary population synthesis code {\tt StarTrack} indicate that, for any set of reasonable initial conditions, there ... More
Controlling the False Discovery Rate in Astrophysical Data AnalysisJul 02 2001The False Discovery Rate (FDR) is a new statistical procedure to control the number of mistakes made when performing multiple hypothesis tests, i.e. when comparing many data against a given model hypothesis. The key advantage of FDR is that it allows ... More
Active Semi-Supervised Learning using Submodular FunctionsFeb 14 2012We consider active, semi-supervised learning in an offline transductive setting. We show that a previously proposed error bound for active learning on undirected weighted graphs can be generalized by replacing graph cut with an arbitrary symmetric submodular ... More
Gotzmann squarefree idealsOct 15 2010We classify the squarefree ideals which are Gotzmann in a polynomial ring.
r-process enrichment of ultra-faint dwarf galaxies by fast merging double neutron starsOct 09 2018Jan 12 2019The recent aLIGO/aVirgo discovery of gravitational waves from the neutron star merger (NSM) GW170817 and the follow up kilonova observations have shown that NSMs produce copious amount of r-process material. However, it is difficult to reconcile the large ... More
Constraints on the Initial-Final Mass Relation from Wide Double White DwarfsOct 21 2015We present observational constraints on the initial-final mass relation (IFMR) using wide double white dwarfs (DWDs). We identify 65 new candidate wide DWDs within the Sloan Digital Sky Survey, bringing the number of candidate wide DWDs to 142. We then ... More
A Serendipitous Pulsar Discovery in a Search for a Companion to a Low-Mass White DwarfJun 15 2018We report the discovery of a previously unidentified pulsar as part of a radio campaign to identify neutron star companions to low-mass white dwarfs (LMWDs) using the Robert C.\ Byrd Green Bank Telescope (GBT). PSR J0802-0955, which is coincident with ... More
Classification of Stellar Spectra with LLEOct 20 2011We investigate the use of dimensionality reduction techniques for the classification of stellar spectra selected from the SDSS. Using local linear embedding (LLE), a technique that preserves the local (and possibly non-linear) structure within high dimensional ... More
Constraining the Initial-Final Mass Relation with Wide Double White DwarfsOct 24 2014In wide double white dwarf (DWD) binaries, in which the co-eval WDs evolve independently, the more massive, faster-evolving WD can be used to obtain a main-sequence lifetime for the less-massive WD. By converting this lifetime into an initial mass for ... More
Event Structure in the Production of High Mass Photon PairsAug 21 1995The event structure associated with the production of massive photon pairs is studied to ${\cal O}(\alpha^2/alpha_s)$. The cross sections for two photon and two photon plus one jet events are given. The Dalitz plot structure of events with two photons ... More
Large Scale GAN Training for High Fidelity Natural Image SynthesisSep 28 2018Feb 25 2019Despite recent progress in generative image modeling, successfully generating high-resolution, diverse samples from complex datasets such as ImageNet remains an elusive goal. To this end, we train Generative Adversarial Networks at the largest scale yet ... More
Towards Physarum EnginesDec 01 2012The slime mould Physarum polycephalum is a suitable candidate organism for soft-matter robotics because it exhibits controllable transport, movement and guidance behaviour. Physarum may be considered as a smart computing and actuating material since both ... More
Sounds Synthesis with Slime Mould of Physarum PolycephalumDec 05 2012Physarum polycephalum is a huge single cell with thousands of nuclei, which behaves like a giant amoeba. During its foraging behaviour this plasmodium produces electrical activity corresponding to different physiological states. We developed a method ... More
Extracting Higgs boson couplings using a jet vetoJun 04 2010Jan 04 2011We show that the Higgs boson's effective couplings to gluons and to weak vector bosons can be extracted simultaneously from an analysis of Higgs plus dijet events by studying the dependence of the observed cross-section upon a third-jet veto.
Representation of Shape Mediated by Environmental Stimuli in Physarum polycephalum and a Multi-agent ModelNov 18 2015The slime mould Physarum polycephalum is known to construct proto- plasmic transport networks which approximate proximity graphs by forag- ing for nutrients during its plasmodial life cycle stage. In these networks, nodes are represented by nutrients ... More
On the role of the plasmodial cytoskeleton in facilitating intelligent behaviour in slime mould Physarum polycephalumMar 10 2015The plasmodium of slime mould Physarum polycephalum behaves as an amorphous reaction-diffusion computing substrate and is capable of apparently intelligent behaviour. But how does intelligence emerge in an acellular organism? Through a range of laboratory ... More
Large Scale GAN Training for High Fidelity Natural Image SynthesisSep 28 2018Despite recent progress in generative image modeling, successfully generating high-resolution, diverse samples from complex datasets such as ImageNet remains an elusive goal. To this end, we train Generative Adversarial Networks at the largest scale yet ... More
Vie Physarale: Evaluation of Roman roads with slime mouldApr 08 2012Roman Empire is renowned for sharp logical design and outstanding building quality of its road system. Many roads built by Romans are still use in continental Europe and UK. The Roman roads were built for military transportations with efficiency in mind, ... More
Ultracool white dwarfs and the age of the Galactic discMar 10 2015Mar 27 2015We present parallax observations and a detailed model atmosphere analysis of 54 cool and ultracool ($T_{\rm eff}$ < 4000 K) white dwarfs (WDs) in the solar neighbourhood. For the first time, a large number of cool and ultracool WDs have distance and tangential ... More
Using APOGEE Wide Binaries to Test Chemical Tagging with Dwarf StarsNov 29 2018Stars of a common origin are thought to have similar, if not nearly identical, chemistry. Chemical tagging seeks to exploit this fact to identify Milky Way subpopulations through their unique chemical fingerprints. In this work, we compare the chemical ... More
Candidate Identification and Interference Removal in SETI@homeSep 07 2011SETI@home, a search for signals from extraterrestrial intelligence, has been recording data at the Arecibo radio telescope since 1999. These data are sent via the Internet to the personal computers of volunteers who have donated their computers' idle ... More
Today a Duo, But Once a Trio? The Double White Dwarf HS 2220$+$2146 May Be A Post-Blue Straggler BinaryJul 01 2016For sufficiently wide orbital separations {\it a}, the two members of a stellar binary evolve independently. This implies that in a wide double white dwarf (DWD), the more massive WD should always be produced first, when its more massive progenitor ends ... More
Non-Parametric Inference in AstrophysicsDec 03 2001We discuss non-parametric density estimation and regression for astrophysics problems. In particular, we show how to compute non-parametric confidence intervals for the location and size of peaks of a function. We illustrate these ideas with recent data ... More
Status of the UC-Berkeley SETI EffortsAug 16 2011Sep 07 2011We summarize radio and optical SETI programs based at the University of California, Berkeley. The SEVENDIP optical pulse search looks for ns time scale pulses at visible wavelengths using an automated 30 inch telescope. The ongoing SERENDIP V.v sky survey ... More
A 1.1 to 1.9 GHz SETI Survey of the Kepler Field: I. A Search for Narrow-band Emission from Select TargetsFeb 04 2013We present a targeted search for narrow-band (< 5 Hz) drifting sinusoidal radio emission from 86 stars in the Kepler field hosting confirmed or candidate exoplanets. Radio emission less than 5 Hz in spectral extent is currently known to only arise from ... More
Mg II Absorption Characteristics of a Volume-Limited Sample of Galaxies at z ~ 0.1Oct 13 2009We present an initial survey of Mg II absorption characteristics in the halos of a carefully constructed, volume-limited subsample of galaxies embedded in the spectroscopic part of the Sloan Digital Sky Survey. We observed quasars near sightlines to 20 ... More
Location-Based and Audience-Aware StorytellingSep 26 2016While the daily user of digital, Internet-enabled devices has some explicit control over what they read and see, the providers fulfilling searches, offering options, and presenting material are using increasingly sophisticated real-time algorithms that ... More
Modeling the Photoionized Interface in Blister HII RegionsJan 20 2000We present a grid of photoionization models for the emission from photoevaporative interfaces between the ionized gas and molecular cloud in blister HII regions. For the density profiles of the emitting gas in the models, we use a general power law form ... More
Primes of the form \pm a^2\pm qb^2Jul 01 2012Apr 14 2013Representations of primes by simple quadratic forms, such as $\pm a^2\pm qb^2$, is a subject that goes back to Fermat, Lagrange, Legendre, Euler, Gauss and many others. We are interested in a comprehensive list of such results, for $q\le 20$. Some of ... More
On the Error of Random Fourier FeaturesJun 09 2015Kernel methods give powerful, flexible, and theoretically grounded approaches to solving many problems in machine learning. The standard approach, however, requires pairwise evaluations of a kernel function, which can lead to scalability issues for very ... More
On Creativity of Slime MouldApr 07 2013Slime mould Physarum polycephalum is large single cell with intriguingly smart behaviour. The slime mould shows outstanding abilities to adapt its protoplasmic network to varying environmental conditions. The slime mould can solve tasks of computational ... More
Gravitational sensing with weak value based optical sensorsJul 29 2018Nov 17 2018Using weak values amplification angular resolution limits, we theoretically investigate the gravitational sensing of objects. By inserting a force-sensing pendulum into a weak values interferometer, the optical response can sense accelerations to a few ... More
Quantitative Transformation for Implementation of Adder Circuits in Physical SystemsNov 18 2015Computing devices are composed of spatial arrangements of simple funda- mental logic gates. These gates may be combined to form more complex adding circuits and, ultimately, complete computer systems. Implementing classical adding circuits using unconventional, ... More
Dynamics of a producer-parasite ecosystem on the brink of collapseJun 14 2013Ecosystems can undergo sudden shifts to undesirable states, but recent studies with simple single species ecosystems have demonstrated that advance warning can be provided by the slowing down of population dynamics near a tipping point. However, it is ... More
Statistical Computations with AstroGrid and the GridNov 15 2005We outline our first steps towards marrying two new and emerging technologies; the Virtual Observatory (e.g, AstroGrid) and the computational grid. We discuss the construction of VOTechBroker, which is a modular software tool designed to abstract the ... More
Routing Physarum with electrical flow/currentApr 08 2012Plasmodium stage of Physarum polycephalum behaves as a distributed dynamical pattern formation mechanism who's foraging and migration is influenced by local stimuli from a wide range of attractants and repellents. Complex protoplasmic tube network structures ... More
Understanding our Origins: Star Formation in H II Region EnvironmentsJun 09 2005Recent analysis of the decay products of short-lived radiounclides (SLRs) in meteorites, in particular the confirmation of the presence of live 60Fe in the early Solar System, provides unambiguous evidence that the Sun and Solar System formed near a massive ... More
CO(1-0) in z>2 Quasar Host Galaxies: No Evidence for Extended Molecular Gas ReservoirsJun 13 2011We report the detection of CO(1-0) emission in the strongly lensed high-redshift quasars IRAS F10214+4724 (z=2.286), the Cloverleaf (z=2.558), RX J0911+0551 (z=2.796), SMM J04135+10277 (z=2.846), and MG 0751+2716 (z=3.200), using the Expanded Very Large ... More
Are motorways rational from slime mould's point of view?Mar 13 2012We analyse the results of our experimental laboratory approximation of motorways networks with slime mould Physarum polycephalum. Motorway networks of fourteen geographical areas are considered: Australia, Africa, Belgium, Brazil, Canada, China, Germany, ... More
Critical metrics on connected sums of Einstein four-manifoldsMar 04 2013We develop a gluing procedure designed to obtain canonical metrics on connected sums of Einstein four-manifolds. The main application is an existence result, using two well-known Einstein manifolds as building blocks: the Fubini-Study metric on $\mathbb{CP}^2$ ... More
Palomar-QUEST: A case study in designing sky surveys in the VO eraFeb 25 2004The advent of wide-area multicolour synoptic sky surveys is leading to data sets unprecedented in size, complexity and data throughput. VO technology offers a way to exploit these to the full but requires changes in design philosophy. The Palomar-QUEST ... More
The NASA-UC Eta-Earth Program: I. A Super-Earth Orbiting HD 7924Jan 28 2009We report the discovery of the first low-mass planet to emerge from the NASA-UC Eta-Earth Program, a super-Earth orbiting the K0 dwarf HD 7924. Keplerian modeling of precise Doppler radial velocities reveals a planet with minimum mass M_P sin i = 9.26 ... More
M2K: I. A Jovian mass planet around the M3V star HIP79431Jan 07 2010Doppler observations from Keck Observatory reveal the presence of a planet with Msini of 2.1 Mjup orbiting the M3V star HIP79431. This is the sixth giant planet to be detected in Doppler surveys of M dwarfs and it is one of the most massive planets discovered ... More
Three-point Correlation Functions of SDSS Galaxies in Redshift Space: Morphology, Color, and Luminosity DependenceMar 27 2004Jul 16 2004We present measurements of the redshift--space three-point correlation function of galaxies in the Sloan Digital Sky Survey (SDSS). For the first time, we analyze the dependence of this statistic on galaxy morphology, color and luminosity. In order to ... More
ALFABURST: A commensal search for Fast Radio Bursts with AreciboOct 30 2017Nov 22 2017ALFABURST has been searching for Fast Radio Bursts (FRBs) commensally with other projects using the Arecibo L-band Feed Array (ALFA) receiver at the Arecibo Observatory since July 2015. We describe the observing system and report on the non-detection ... More
Large eccentricity, low mutual inclination: the three-dimensional architecture of a hierarchical system of giant planetsMay 20 2014Jul 12 2014We establish the three-dimensional architecture of the Kepler-419 (previously KOI-1474) system to be eccentric yet with a low mutual inclination. Kepler-419b is a warm Jupiter at semi-major axis a = 0.370 +0.007/-0.006 AU with a large eccentricity e=0.85 ... More
Noise-based switches and amplifiers for gene expressionMar 30 2000The regulation of cellular function is often controlled at the level of gene transcription. Such genetic regulation usually consists of interacting networks, whereby gene products from a single network can act to control their own expression or the production ... More
A VLA Search for Water Masers in Six HII Regions: Tracers of Triggered Low-Mass Star FormationApr 19 2004We present a search for water maser emission at 22 GHz associated with young low-mass protostars in six HII regions -- M16, M20, NGC 2264, NGC 6357, S125, and S140. The survey was conducted with the NRAO Very Large Array from 2000 to 2002. For several ... More
Accelerating Inference: towards a full Language, Compiler and Hardware stackDec 12 2012We introduce Dimple, a fully open-source API for probabilistic modeling. Dimple allows the user to specify probabilistic models in the form of graphical models, Bayesian networks, or factor graphs, and performs inference (by automatically deriving an ... More
Bayesian Nonparametric Kernel-LearningJun 29 2015Jan 30 2018Kernel methods are ubiquitous tools in machine learning. However, there is often little reason for the common practice of selecting a kernel a priori. Even if a universal approximating kernel is selected, the quality of the finite sample estimator may ... More
Combining Progressive Hedging with a Frank-Wolfe Method to Compute Lagrangian Dual Bounds in Stochastic Mixed-Integer ProgrammingFeb 03 2017We present a new primal-dual algorithm for computing the value of the Lagrangian dual of a stochastic mixed-integer program (SMIP) formed by relaxing its nonanticipativity constraints. This dual is widely used in decomposition methods for the solution ... More
Driverseat: Crowdstrapping Learning Tasks for Autonomous DrivingDec 07 2015While emerging deep-learning systems have outclassed knowledge-based approaches in many tasks, their application to detection tasks for autonomous technologies remains an open field for scientific exploration. Broadly, there are two major developmental ... More
Visual Search at PinterestMay 28 2015Oct 13 2015We demonstrate that, with the availability of distributed computation platforms such as Amazon Web Services and open-source tools, it is possible for a small engineering team to build, launch and maintain a cost-effective, large-scale visual search system ... More
Weak-value amplification and optimal parameter estimation in the presence of correlated noiseMar 04 2017Jun 16 2017We analytically and numerically investigate the performance of weak-value amplification (WVA) and related parameter estimation methods in the presence of temporally correlated noise. WVA is a special instance of a general measurement strategy that involves ... More
Automated Fact Checking in the News RoomApr 03 2019Fact checking is an essential task in journalism; its importance has been highlighted due to recently increased concerns and efforts in combating misinformation. In this paper, we present an automated fact-checking platform which given a claim, it retrieves ... More
Visual Search at PinterestMay 28 2015Mar 08 2017We demonstrate that, with the availability of distributed computation platforms such as Amazon Web Services and open-source tools, it is possible for a small engineering team to build, launch and maintain a cost-effective, large-scale visual search system ... More
Astronomy in the Cloud: Using MapReduce for Image CoadditionOct 05 2010In the coming decade, astronomical surveys of the sky will generate tens of terabytes of images and detect hundreds of millions of sources every night. The study of these sources will involve computation challenges such as anomaly detection and classification, ... More
The Importance of Computing Education ResearchApr 12 2016Interest in computer science is growing. As a result, computer science (CS) and related departments are experiencing an explosive increase in undergraduate enrollments and unprecedented demand from other disciplines for learning computing. According to ... More
Using Web Co-occurrence Statistics for Improving Image CategorizationDec 19 2013Dec 20 2013Object recognition and localization are important tasks in computer vision. The focus of this work is the incorporation of contextual information in order to improve object recognition and localization. For instance, it is natural to expect not to see ... More
Heisenberg scaling with weak measurement: A quantum state discrimination point of viewSep 11 2014We examine the results of the paper "Precision metrology using weak measurements", [Zhang, Datta, and Walmsley, arXiv:1310.5302] from a quantum state discrimination point of view. The Heisenberg scaling of the photon number for the precision of the interaction ... More
Dynamics in atomic signaling gamesDec 20 2013We study an atomic signaling game under stochastic evolutionary dynamics. There is a finite number of players who repeatedly update from a finite number of available languages/signaling strategies. Players imitate the most fit agents with high probability ... More
Linear-time Learning on Distributions with Approximate Kernel EmbeddingsSep 24 2015Many interesting machine learning problems are best posed by considering instances that are distributions, or sample sets drawn from distributions. Previous work devoted to machine learning tasks with distributional inputs has done so through pairwise ... More
Labeling Bias in Galaxy MorphologiesNov 08 2018We present a metric to quantify systematic labeling bias in galaxy morphology data sets stemming from the quality of the labeled data. This labeling bias is independent from labeling errors and requires knowledge about the intrinsic properties of the ... More
Improved association in a classical density functional theory for waterSep 07 2013We present a modification to our recently published SAFT-based classical density functional theory for water. We have recently developed and tested a functional for the averaged radial distribution function at contact of the hard-sphere fluid that is ... More
Separation-Sensitive Collision Detection for Convex ObjectsSep 18 1998Oct 24 1998We develop a class of new kinetic data structures for collision detection between moving convex polytopes; the performance of these structures is sensitive to the separation of the polytopes during their motion. For two convex polygons in the plane, let ... More
HST Observations of the Wolf-Rayet Nebula NGC 6888Mar 03 2000We present Hubble Space Telescope WFPC2 images of a portion of the bright northeast rim of NGC 6888, the nebular shell physically associated with the Wolf-Rayet star HD 192163. The exposures are taken in the light of Halpha 6563, [O III] 5007, and [S ... More
Guided acoustic and optical waves in silicon-on-insulator for Brillouin scattering and optomechanicsApr 16 2016We numerically study silicon waveguides on silica showing that it is possible to simultaneously guide optical and acoustic waves in the technologically important silicon on insulator (SOI) material system. Thin waveguides, or fins, exhibit geometrically ... More
Learning both Weights and Connections for Efficient Neural NetworksJun 08 2015Oct 30 2015Neural networks are both computationally intensive and memory intensive, making them difficult to deploy on embedded systems. Also, conventional networks fix the architecture before training starts; as a result, training cannot improve the architecture. ... More
Deep Mean MapsNov 13 2015The use of distributions and high-level features from deep architecture has become commonplace in modern computer vision. Both of these methodologies have separately achieved a great deal of success in many computer vision tasks. However, there has been ... More
Kernels on Sample Sets via Nonparametric Divergence EstimatesFeb 01 2012Dec 05 2012Most machine learning algorithms, such as classification or regression, treat the individual data point as the object of interest. Here we consider extending machine learning algorithms to operate on groups of data points. We suggest treating a group ... More
Photometry and Spectroscopy of Coma Dwarf EllipticalsSep 05 1997We have used deep R- and B-band CCD images (with ~1.2 arcsec seeing) of the central ~700 arcmin^2 of the Coma cluster core (and an associated ~270 arcmin^2 control field) to study the early-type dwarf elliptical (dE) galaxy population. Analysis of the ... More
Embedded Star Formation in the Eagle NebulaJan 17 2002M16=NGC 6611, the Eagle Nebula, is a well studied region of star formation and the source of a widely recognized Hubble Space Telescope (HST) image. High spatial resolution infrared observations with the Near Infrared Camera and Multi-Object Spectrometer ... More
Measuring the Equation-of-state of the Universe: Pitfalls and ProspectsDec 21 2001We explore various pitfalls and challenges in determining the equation-of-state (w) of dark energy component that dominates the universe and causes the current accelerated expansion. We demonstrated in an earlier paper the existence of a degeneracy that ... More
Star formation and the interstellar medium in z>6 UV-luminous Lyman-break galaxiesApr 22 2015May 22 2015We present Atacama Large Millimeter Array (ALMA) detections of atomic carbon line and dust continuum emission in two UV-luminous galaxies at redshift 6. The far-infrared (FIR) luminosities of these galaxies are substantially lower than similar starbursts ... More
Stellar Populations in Three Outer Fields of the LMCNov 13 1997We present HST photometry for three fields in the outer disk of the LMC extending approximately four magnitudes below the faintest main sequence turnoff. We cannot detect any strongly significant differences in the stellar populations of the three fields ... More
Stellar Populations at the Center of IC 1613May 27 1999We have observed the center of the Local Group dwarf irregular galaxy IC 1613 with WFPC2 aboard the Hubble Space Telescope in the F439W, F555W, and F814W filters. We find a dominant old stellar population (aged ~7 Gyr), identifiable by the strong red ... More
The Transit Ingress and the Tilted Orbit of the Extraordinarily Eccentric Exoplanet HD 80606bJul 29 2009Sep 01 2009We present the results of a transcontinental campaign to observe the 2009 June 5 transit of the exoplanet HD 80606b. We report the first detection of the transit ingress, revealing the transit duration to be 11.64 +/- 0.25 hr and allowing more robust ... More