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Results for "Hsiao-Wen Chen"

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On the Observed W_MgII--L_[OII] Correlation in SDSS QSO SpectraOct 14 2011This paper investigates the effect of differential aperture loss with SDSS fibers and examines whether such selection bias would result in the observed correlation between rest-frame absorption equivalent width of MgII absorbers, Wr(2796), and mean associated ... More
Mining Circumgalactic Baryons in the Low-Redshift UniverseFeb 14 2014Sep 11 2014(Abridged) This paper presents an absorption-line study of the multiphase circumgalactic medium (CGM) based on observations of Lya, CII, CIV, SiII, SiIII, and SiIV absorption transitions in the vicinities of 195 galaxies at redshift z<0.176. The galaxy ... More
The Nature of Damped Ly-alpha Absorbing Galaxies at z<=1--A Photometric Redshift Survey of Damped Ly-alpha AbsorbersAug 11 2003We study the nature of damped Lya absorption (DLA) systems at z<=1 using a sample of 11 DLA galaxies, for which accurate redshift measurements are available. We demonstrate that the precision of photometric redshifts is sufficient for identifying DLA ... More
The Baryon Content of Dark Matter Halos: Empirical Constraints from MgII AbsorbersJan 14 2008Jul 08 2008We have initiated a survey of MgII 2796, 2803 absorbers near known galaxies at projected distances rho<~100 h^-1 kpc to a background QSO, in order to constrain the extent and covering fraction of Mg^+ ions around galaxies of different luminosity and mass. ... More
The Star Formation History of Luminous Red Galaxies Hosting MgII AbsorbersAug 19 2011We present a spectroscopic sample of z \approx 0.5 luminous red galaxies (LRGs) that are located within physical projected distances \rho \leq 350 kpc/h of a QSO sightline. Of the 37 LRGs in our sample, eight have associated MgII absorbers with rest-frame ... More
Empirical Constraints of Super-Galactic Winds at z >= 0.5May 17 2012(Abridged) Under the hypothesis that MgII absorbers found near the minor axis of a galaxy originate in the cool phase of winds, we carry out a study to constrain the properties of large-scale outflows at redshift z >= 0.5 based on the observed relative ... More
HST Detection of Extended Neutral Hydrogen in a Massive Elliptical at z = 0.4Sep 05 2017We report the first detection of extended neutral hydrogen (HI) gas in the interstellar medium (ISM) of a massive elliptical galaxy beyond z~0. The observations utilize the doubly lensed images of QSO HE 0047-1756 at z_QSO = 1.676 as absorption-line probes ... More
A Shot in the Dark: A Technique for Locating the Stellar Counterparts of Damped Lyman Alpha AbsorbersMar 13 2006We present initial results from a Magellan telescope program to image galaxies that give rise to damped Lyman absorbers (DLAs) at 1.63 < z_DLA < 2.37. Our program differs from previous efforts in that we target quasars with intervening Lyman limit systems ... More
Virtual Machine Introspection Based Malware Behavior Profiling and Family GroupingMay 04 2017The proliferation of malwares have been attributed to the alternations of a handful of original malware source codes. The malwares alternated from the same origin share some intrinsic behaviors and form a malware family. Expediently, identifying its malware ... More
On the possible environmental effect in distributing heavy elements beyond individual gaseous halosMar 13 2015May 01 2015We present a study of extended galaxy halo gas through HI and OVI absorption over two decades in projected distance at $z\approx0.2$. The study is based on a sample of $95$ galaxies from a highly complete ($ > 80\%$) survey of faint galaxies ($L > 0.1L_*$) ... More
The incidence of cool gas in ~ 1e13 Msun halosApr 29 2010We present the first results of an ongoing spectroscopic follow-up of close luminous red galaxy (LRGs) and MgII {\lambda}{\lambda} 2796,2803 absorber pairs for an initial sample of 15 photometrically selected LRGs at physical projected separations {\rho} ... More
Escape of Ionizing Radiation from High Redshift GalaxiesJul 06 2007We model the escape of ionizing radiation from high-redshift galaxies using high-resolution Adaptive Mesh Refinement N-body + hydrodynamics simulations. Our simulations include time-dependent and spatially-resolved transfer of ionizing radiation in three ... More
The Origin of \lya Absorption Systems at $z>1$---Implications from the Hubble Deep FieldDec 07 1999The Hubble Deep Field images have provided us with a unique chance to relate statistical properties of high-redshift galaxies to statistical properties of \lya absorption systems. Combining an {\em empirical} measure of the galaxy surface density versus ... More
Photometric/Spectroscopic Redshift Identification of Faint Galaxies in STIS Slitless Spectroscopy ObservationsJul 01 1999We present a new spectrum extraction technique which employs optimal weights for the spectral extraction, deblends the overlapping spectra, determines the precise sky background, and takes into account correlations between errors correctly for STIS slitless ... More
The Unusual Spectral Energy Distribution of a Galaxy Previously Reported to be at Redshift 6.68Nov 30 2000Observations of distant galaxies are important both for understanding how galaxies form and for probing the physical conditions of the universe at the earliest epochs. It is, however, extremely difficult to identify galaxies at redshift z>5, because these ... More
Galaxies at Redshifts z > 5Sep 24 1998Here we describe our attempts to establish statistically complete samples of very high redshift galaxies by obtaining photometric redshifts of galaxies in Medium Deep Survey (MDS) fields and photometric and spectroscopic redshifts of galaxies in very ... More
Star Formation from DLA Gas in the Outskirts of Lyman Break Galaxies at z~3Nov 29 2010May 24 2011We present evidence for spatially extended low surface brightness emission around Lyman break galaxies (LBGs) in the V band image of the Hubble Ultra Deep Field, corresponding to the z~3 rest-frame FUV light, which is a sensitive measure of star formation ... More
ALMA Submillimeter Continuum Imaging of the Host Galaxies of GRB021004 and GRB080607Nov 12 2012We report 345 GHz continuum observations of the host galaxies of gamma-ray bursts (GRBs) 021004 and 080607 at z>2 using the Atacama Large Millimeter/Submillimeter Array (ALMA) in Cycle 0. Of the two bursts, GRB021004 is one of the few GRBs that originates ... More
Probing the IGM-galaxy connection at z<0.5 II. New insights into the galaxy environments of OVI absorbers in PKS 0405-123Aug 12 2013We present new absorption-line analysis and new galaxy survey data obtained for the field around PKS0405-123 at z=0.57. Combining previously known OVI absorbers with new identifications in the higher S/N UV spectra obtained with COS, we have established ... More
On the origin of excess cool gas in quasar host halosMay 28 2015Jul 01 2015Previous observations of quasar host halos at z=2 have uncovered large quantities of cool gas that exceed what is found around inactive galaxies of both lower and higher masses. To better understand the source of this excess cool gas, we compiled an exhaustive ... More
The Origin of C IV Absorption Systems at Redshifts z<1---Discovery of Extended C IV Envelopes Around GalaxiesApr 25 2001(Abridged) We report the discovery of extended CIV gaseous envelopes around galaxies of a wide range of luminosity and morphological type. First, we show that CIV absorption systems are strongly clustered around galaxies on velocity scales of v < 250 ... More
The Clustering of MgII Absorption Systems at z=0.5 and Detection of Cold Gas in Massive HalosFeb 18 2009Jun 30 2009We measure the large-scale clustering of MgII \lambda\lambda 2796,2803 absorbers with respect to a population of luminous red galaxies (LRGs) at z \sim 0.5. From the cross-correlation measurements between MgII absorbers and LRGs, we calculate the mean ... More
Resolving The ISM Surrounding GRBs with Afterglow SpectroscopyMay 20 2008We review current research related to spectroscopy of gamma-ray burst (GRB) afterglows with particular emphasis on the interstellar medium (ISM) of the galaxies hosting these high redshift events. These studies reveal the physical conditions of star-forming ... More
Probing the IGM-Galaxy Connection Toward PKS0405-123 II : A Cross-Correlation Study of Lya Absorbers and Galaxies at z<0.5Jul 26 2005We present a pilot study of the clustering properties of Lya absorbers with respect to known galaxies based on 112 Lya absorbers and 482 galaxies identified at z<0.5 along the sightline toward PKS0405-123. The principal goal is to determine the origin ... More
Probing the Cool Interstellar and Circumgalactic Gas of Three Massive Lensing Galaxies at z=0.4-0.7Oct 14 2015Feb 29 2016We present multi-sightline absorption spectroscopy of cool gas around three lensing galaxies at z=0.4-0.7. These lenses have half-light radii r_e=2.6-8 kpc and stellar masses of log M*/Ms=10.9-11.4, and therefore resemble nearby passive elliptical galaxies. ... More
All about Structure: Adapting Structural Information across Domains for Boosting Semantic SegmentationMar 26 2019In this paper we tackle the problem of unsupervised domain adaptation for the task of semantic segmentation, where we attempt to transfer the knowledge learned upon synthetic datasets with ground-truth labels to real-world images without any annotation. ... More
The Last Eight-Billion Years of Intergalactic SiIV EvolutionNov 02 2010Jan 05 2011We identified 24 SiIV absorption systems with z <~ 1 from a blind survey of 49 low-redshift quasars with archival Hubble Space Telescope ultraviolet spectra. We relied solely on the characteristic wavelength separation of the doublet to automatically ... More
Constraints on the Unseen Galaxy Population from the Lyman-alpha ForestDec 15 1998Here we describe results of our attempt to determine what types of galaxies are responsible for the Lyman-alpha forest absorption systems, based on our ongoing imaging and spectroscopic survey of faint galaxies in fields of HST spectroscopic target QSOs. ... More
Spatially Resolved Velocity Maps of Halo Gas Around Two Intermediate-redshift GalaxiesNov 29 2013Absorption-line spectroscopy of multiply-lensed QSOs near a known foreground galaxy provides a unique opportunity to go beyond the traditional one-dimensional application of QSO probes and establish a crude three-dimensional (3D) map of halo gas around ... More
Probing IGM accretion onto faint Lyα emitters at z~2.8Mar 22 2019(abridged) Observing the signature of accretion from the intergalactic medium (IGM) onto galaxies at z~3 requires the detection of faint (L<<L*) galaxies embedded in a filamentary matrix of low-density, metal-poor gas coherent over hundreds of kpc. We ... More
The HST/ACS Grism Parallel Survey: II. First Results and a Catalog of Faint Emission-Line Galaxies at z < 1.6Mar 28 2005We present the first results from the HST/ACS Grism Parallel Survey, a large program obtaining deep, slitless ACS grism spectroscopy of high-latitude HST parallel fields. We report on 11 high Galactic latitude fields here, each with grism integration ... More
Warm Gas in the Virgo Cluster: I. Distribution of Lya AbsorbersApr 27 2012Jun 12 2012The first systematic study of the warm gas (T=10^4-5 K) distribution across a galaxy cluster is presented using multiple background QSOs to the Virgo Cluster. We detect 25 Lya absorbers (N_HI = 10^13.1-15.4 cm^-2) in the Virgo velocity range toward 9 ... More
Characterizing the Chemically-Enriched Circumgalactic Medium of ~38000 Luminous Red Galaxies in SDSS DR12Oct 05 2015We report a definitive detection of chemically-enriched cool gas around massive, quiescent galaxies at z~0.4-0.7. The result is based on a survey of 37621 luminous red galaxy (LRG)-QSO pairs in SDSS DR12 with projected distance d<500 kpc. The LRGs are ... More
Gauging Metallicity of Diffuse Gas Under An Uncertain Ionizing Radiation FieldJun 14 2017Gas metallicity is a key quantity used to determine the physical conditions of gaseous clouds in a wide range of astronomical environments, including interstellar and intergalactic space. In particular, considerable effort in circumgalactic medium (CGM) ... More
Missing Molecular Hydrogen and the Physical Conditions of GRB Host GalaxiesMar 26 2007We examine the abundance of molecular hydrogen (H2) in the spectra of gamma ray burst afterglows (GRBs). In nearby galaxies H2 traces the cold neutral medium (CNM) and dense molecular star-forming interstellar gas. Though H2 is detected in at least half ... More
On the Nature of Velocity Fields in High z GalaxiesMar 27 2007We analyze the gas kinematics of damped Lya systems (DLAs) hosting high z gamma-ray bursts (GRBs) and those toward quasars (QSO-DLAs) focusing on threestatistics: (1) dv, the velocity interval encompassing 90% of the totaloptical depth, (2,3) Wsi and ... More
Temporal Variation in Excited Fe^+ Near a GRB AfterglowJun 20 2006Excited Si^+ and Fe^+ species are routinely observed in the host environment of gamma-ray burst (GRB) afterglows, but are not commonly seen in other extragalactic locations. Their presence signals unusual properties in the gaseous environment of these ... More
Deep Keck u-band imaging of the Hubble Ultra Deep Field: A catalog of z~3 Lyman Break GalaxiesAug 03 2009Sep 21 2009We present a sample of 407 z~3 Lyman break galaxies (LBGs) to a limiting isophotal u-band magnitude of 27.6 mag in the Hubble Ultra Deep Field (UDF). The LBGs are selected using a combination of photometric redshifts and the u-band drop-out technique ... More
Probing the ISM Near Star Forming Regions with GRB Afterglow Spectroscopy: Gas, Metals, and DustMar 26 2007We study the chemical abundances of the interstellar medium surrounding high z gamma-ray bursts (GRBs) through analysis of the damped Lya systems (DLAs) identified in afterglow spectra. These GRB-DLAs are characterized by large HI column densities N(HI) ... More
Probing the IGM/Galaxy Connection Toward PKS0405-123 I: UV Spectroscopy and Metal-Line SystemsAug 16 2004We present results from an analysis of FUSE and HST/STIS spectroscopy of the z_em=0.57 quasar PKS0405-123. We focus on the intervening metal-line systems identified along the sightline and investigate their ionization mechanism, ionization state, and ... More
The extent of chemically enriched gas around star-forming dwarf galaxiesOct 17 2017Nov 15 2017Supernova driven winds are often invoked to remove chemically enriched gas from dwarf galaxies to match their low observed metallicities. In such shallow potential wells, outflows may produce massive amounts of enriched halo gas (circum-galactic medium ... More
On the Incidence of C IV Absorbers Along the Sightlines to Gamma-Ray BurstsMay 02 2007Sep 03 2007We report on the statistics of strong (W_r > 0.15 A) C IV absorbers at z=1.5-3.5 toward high-redshift gamma-ray bursts (GRBs). In contrast with a recent survey for strong Mg II absorption systems at z < 2, we find that the number of C IV absorbers per ... More
Probing the IGM/Galaxy Connection Toward PKS0405-123 III: The Galaxy Survey and Correlations with OVI AbsorbersFeb 07 2006We present a galaxy survey of the field surrounding PKS0405-123 performed with the WFCCD spectrometer at Las Campanas Observatory. The survey is comprised of two datasets: (1) a greater than 95% complete survey to R = 20 of the field centered on PKS0405-123 ... More
Characterizing the Low-Redshift Intergalactic Medium towards PKS1302-102Jun 09 2007Dec 17 2007We present a detailed analysis of the intergalactic metal-line absorption systems in the archival HST/STIS and FUSE ultraviolet spectra of the low-redshift quasar PKS1302-102 (z_QSO = 0.2784). We supplement the archive data with CLOUDY ionization models ... More
The Last Eight-Billion Years of Intergalactic CIV EvolutionJun 18 2009Nov 17 2009We surveyed the HST UV spectra of 49 low-redshift quasars for z < 1 CIV candidates, relying solely on the characteristic wavelength separation of the doublet. After consideration of the defining traits of CIV doublets (e.g., consistent line profiles, ... More
Discovery of the Galaxy Proximity Effect and Implications for Measurements of the Ionizing Background Radiation at Low RedshiftsJul 16 2001We present an analysis of galaxy and QSO absorption line pairs toward 24 QSOs at redshifts between z~0.2 and 1 in an effort to establish the relationship between galaxies and absorption lines in physical proximity to QSOs. We demonstrate the existence ... More
The Gaseous Extent of Galaxies and the Origin of Lya Absorption Systems. V. Optical and Near-Infrared Photometry of Lya-absorbing Galaxies at z < 1Jul 06 2001(Abridged) We present results of a program to obtain and analyze HST WFPC2 images and ground-based images of galaxies identified in an imaging and spectroscopic survey of faint galaxies in fields of HST spectroscopic target QSOs. We confirm and improve ... More
On the radial profile of gas-phase Fe/α ratio around distant galaxiesNov 29 2016This paper presents a study of the chemical compositions in cool gas around a sample of 27 intermediate-redshift galaxies. The sample comprises 13 massive quiescent galaxies at z=0.40-0.73 probed by QSO sightlines at projected distances d=3-400 kpc, and ... More
A Survey for NV Absorption at z~z_GRB in GRB Afterglow Spectra: Clues to Gas Near the Progenitor StarJun 02 2008We survey NV absorption in the afterglow spectra of long-duration gamma-ray bursts (GRBs) with the intent to study highly ionized gas in the galaxies hosting these events. We identify a high incidence (6/7) of spectra exhibiting NV gas with z~z_GRB and ... More
Discovery of a transparent sightline at ρ < 20 kpc from an interacting pair of galaxiesDec 13 2013We report the discovery of a transparent sightline at projected distances of {\rho} < 20 kpc to an interacting pair of mature galaxies at z = 0.12. The sightline of the UV-bright quasar PG1522+101 at z = 1.328 passes at {\rho} = 11.5 kpc from the higher-mass ... More
An Empirical Characterization of Extended Cool Gas Around Galaxies Using MgII Absorption FeaturesApr 05 2010We report results from a survey of MgII absorbers in the spectra of background QSOs that are within close angular distances to a foreground galaxy at z<0.5, using the Magellan Echellette Spectrograph. We have established a spectroscopic sample of 94 galaxies ... More
Photometry and Photometric Redshifts of Faint Galaxies in the Hubble Deep Field South NICMOS FieldMar 22 2000We present a catalog of photometry and photometric redshifts of 335 faint objects in the HDF-S NICMOS field. The analysis is based on (1) infrared images obtained with the Hubble Space Telescope (HST) using the Near Infrared Camera and Multi-Object Spectrograph ... More
On the absence of Wind Signatures in GRB Afterglow Spectra: Constraints on the Wolf-Rayet Winds of GRB ProgenitorsNov 02 2006Apr 10 2007We investigate available constraints on the circumstellar medium (CSM) around long-duration gamma-ray burst (GRB) progenitors from afterglow spectra. We first establish a statistical sample of five GRB afterglow spectra that have been collected and analyzed ... More
Casting light on the 'anomalous' statistics of Mg II absorbers toward Gamma-Ray Burst afterglows: the incidence of weak systemsMay 22 2009Oct 20 2009We revisit echelle spectra (spectral resolution R ~ 40000) of 8 Gamma-Ray Burst afterglows to obtain the incidence (dN/dz) of weak intervening Mg II systems at a mean redshift of <z> = 1.5. We show that dN/dz of systems having restframe equivalent widths ... More
High Metallicity, Photoionised Gas in Intergalactic Large-Scale FilamentsDec 06 2005Aug 21 2006We present high-resolution UV spectra of absorption-line systems toward the low-z QSO HS0624+6907 (z=0.3700). Coupled with spectroscopic galaxy redshifts, we find that many of these absorbers are integalactic gas clouds distributed within large-scale ... More
Galaxies Associated with z~4 Damped Lya Systems: I. Imaging and Photometric SelectionJan 25 2002Jan 25 2002This paper describes the acquisition and analysis of imaging data for the identification of galaxies associated with z~4 damped Lya systems. We present deep BRI images of three fields known to contain four z~4 damped systems. We discuss the reduction ... More
Halo Masses of MgII absorbers at z\sim 0.5 from SDSS DR7Dec 16 2013We present the cross-correlation function of MgII absorbers with respect to a volume-limited sample of luminous red galaxies (LRGs) at z=0.45-0.60 using the largest MgII absorber sample and a new LRG sample from SDSS DR7. We present the clustering signal ... More
What Determines the Incidence and Extent of MgII Absorbing Gas Around Galaxies?Nov 02 2010We study the connections between on-going star formation, galaxy mass, and extended halo gas, in order to distinguish between starburst-driven outflows and infalling clouds that produce the majority of observed MgII absorbers at large galactic radii (>~ ... More
Characterizing Circumgalactic Gas around Massive Ellipticals at z~0.4 - II. Physical Properties and Elemental AbundancesSep 13 2018Jan 14 2019We present a systematic investigation of the circumgalactic medium (CGM) within projected distances d<160 kpc of luminous red galaxies (LRGs). The sample comprises 16 intermediate-redshift (z=0.21-0.55) LRGs of stellar mass M_star>1e11 M_sun. Combining ... More
The Las Campanas Infrared Survey. IV. The Photometric Redshift Survey and the Rest-frame R-band Galaxy Luminosity Function at 0.5 <= z <= 1.5Dec 05 2002(Abridged) We present rest-frame R-band galaxy luminosity function measurements for three different redshift ranges: 0.5<=z<=0.75, 0.75<=z<=1.0, and 1.0<=z<=1.5. Our measurements are based on photometric redshifts for ~3000 H-band selected galaxies with ... More
Characterizing Circumgalactic Gas around Massive Ellipticals at z ~ 0.4 I. Initial ResultsMay 18 2018Jul 30 2018We present a new Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) absorption-line survey to study halo gas around 16 luminous red galaxies (LRGs) at z=0.21-0.55. The LRGs are selected uniformly with stellar mass Mstar>1e11 Msun and no prior ... More
Damped Lyman-alpha Absorption Associated with an Early-Type Galaxy at Redshift z = 0.16377Jul 14 1997We report new HST and ground-based observations of a damped Lyman-alpha absorption system toward the QSO 0850+4400. The redshift of the absorption system is z = 0.163770 and the neutral hydrogen column density of the absorption system is log N = 19.81 ... More
The Host Galaxy of GRB 031203: Implications of its low metallicity, low redshift, and starburst natureFeb 03 2004Apr 20 2004We present Keck/NIRSPEC near-IR images and Magellan/IMACS optical spectroscopy of the host galaxy of GRB 031203. The host is an actively star-forming galaxy at z=0.1055 +/- 0.0001. This is the lowest redshift GRB to-date, aside from GRB 980425. From the ... More
Characterizing circumgalactic gas around massive ellipticals at z~0.4 III. The galactic environment of a chemically-pristine Lyman limit absorberJan 14 2019This paper presents a study of the galactic environment of a chemically-pristine (<0.6% solar metallicity) Lyman Limit system (LLS) discovered along the sightline toward QSO SDSSJ135726.27+043541.4 (zQSO=1.233) at projected distance d=126 physical kpc ... More
The Gemini Deep Deep Survey: III. The abundance of massive galaxies 3-6 billion years after the Big BangJan 05 2004Jul 13 2004Hierarchical galaxy formation is the model whereby massive galaxies form from an assembly of smaller units. The most massive objects therefore form last. The model succeeds in describing the clustering of galaxies, but the evolutionary history of massive ... More
Scrambling Code Planning in TD-SCDMA SystemsMar 25 2013Mar 30 2013This paper has been withdrawn by the author due to a crucial sign error in equation 2.
Reduction of Feynman Integrals in Parametric RepresentationFeb 27 2019In this paper, we propose a new approach to reduce Feynman integrals. Instead of traditional integration-by-part (IBP) identities, identities between Feynman integrals in the parametric representation are constructed. This method has several advantages ... More
Reduction of Feynman Integrals in Parametric RepresentationFeb 27 2019Mar 02 2019In this paper, we propose a new approach to reduce Feynman integrals. Instead of traditional integration-by-part (IBP) identities, identities between Feynman integrals in the parametric representation are constructed. This method has several advantages ... More
Reduction of Feynman Integrals in the Parametric RepresentationFeb 27 2019Apr 29 2019In this paper, we propose a new approach to reduce Feynman integrals. Instead of traditional integration-by-part (IBP) identities, identities between Feynman integrals in the parametric representation are constructed. This method has several advantages ... More
Multi-Antenna Relay Aided Wireless Physical Layer SecurityApr 12 2015With growing popularity of mobile Internet, providing secure wireless services has become a critical issue. Physical layer security (PHY-security) has been recognized as an effective means to enhance wireless security by exploiting wireless medium characteristics, ... More
Connecting Mirror Symmetry in 3d and 2d via LocalizationDec 09 2013We explicitly apply localization results to study the interpolation between three and two dimensional mirror symmetry for Abelian gauge theories with four supercharges. We first use the ellipsoid S_b^3 partition functions to verify the mirror symmetry ... More
The Circumgalactic Medium in Massive HalosDec 02 2016This chapter presents a review of the current state of knowledge on the cool (T ~ 1e4 K) halo gas content around massive galaxies at z ~ 0.2-2. Over the last decade, significant progress has been made in characterizing the cool circumgalactic gas in massive ... More
Secrecy Wireless Information and Power Transfer: Challenges and OpportunitiesDec 21 2015Dec 22 2015Wireless information and power transfer (WIPT) enables more sustainable and resilient communications owing to the fact that it avoids frequent battery charging and replacement. However, it also suffers from possible information interception due to the ... More
MuseGAN: Multi-track Sequential Generative Adversarial Networks for Symbolic Music Generation and AccompanimentSep 19 2017Nov 24 2017Generating music has a few notable differences from generating images and videos. First, music is an art of time, necessitating a temporal model. Second, music is usually composed of multiple instruments/tracks with their own temporal dynamics, but collectively ... More
Galaxy and Quasar Fueling Caught in the Act from the Intragroup to the Interstellar MediumNov 26 2018We report the discovery of six spatially extended (10-100 kpc) line-emitting nebulae in the z=0.57 galaxy group hosting PKS0405-123, one of the most luminous quasars at z<1. The discovery is enabled by the Multi Unit Spectroscopic Explorer (MUSE) and ... More
When do early-type galaxies form?Nov 10 2006We have used the Hubble Space Telescope's Advanced Camera for Surveys to measure the mass density function of morphologically selected early-type galaxies in the Gemini Deep Deep Survey fields, over the redshift range 0.9 < z < 1.6. Our imaging data set ... More
Red Nuggets at z~1.5: Compact passive galaxies and the formation of the Kormendy RelationJul 10 2008Jan 09 2009We present the results of NICMOS imaging of a sample of 16 high mass passively evolving galaxies with 1.3<z<2, taken primarily from the Gemini Deep Deep Survey. Around 80% of galaxies in our sample have spectra dominated by stars with ages >1 Gyr. Our ... More
The Gemini Deep Deep Survey: I. Introduction to the Survey, Catalogs and Composite SpectraFeb 18 2004The Gemini Deep Deep Survey (GDDS) is an ultra-deep (K<20.6 mag, I<24.5 mag) redshift survey targeting galaxies in the "redshift desert" between 1<z<2. The primary goal of the survey is to constrain the space density at high redshift of evolved high-mass ... More
The Gemini Deep Deep Survey: VIII. When Did Early-type Galaxies Form?Jan 26 2007Jul 16 2007We have used the Hubble Space Telescope's Advanced Camera for Surveys (Ford et al. 2003) to measure the cumulative mass density in morphologically-selected early-type galaxies over the redshift range 0.8 < z < 1.7. Our imaging data set covers four well-separated ... More
Gemini Deep Deep Survey VI: Massive Hdelta-strong galaxies at z=1Mar 17 2005Jan 17 2006We show that there has been a dramatic decline in the abundance of massive galaxies with strong Hdelta stellar absorption lines from z=1.2 to the present. These ``Hdelta-strong'', or HDS, galaxies have undergone a recent and rapid break in their star-formation ... More
A Mature Dusty Star-forming Galaxy Hosting GRB080607 at z=3.036Oct 05 2010Dec 10 2010We report the discovery of the host galaxy of dark burst GRB080607 at z_GRB=3.036. GRB080607 is a unique case of a highly extinguished (A_V~3 mag) afterglow that was yet sufficiently bright for high-quality absorption-line spectroscopy. The host galaxy ... More
Evolved Galaxies at z > 1.5 from the Gemini Deep Deep Survey: The Formation Epoch of Massive Stellar SystemsAug 19 2004We present spectroscopic evidence from the Gemini Deep Deep Survey (GDDS) for a significant population of color-selected red galaxies at 1.3 < z < 2.2 whose integrated light is dominated by evolved stars. Unlike radio-selected objects, the z > 1.5 old ... More
Analysis and Practice of Uniquely Decodable One-to-One CodeAug 30 2015In this paper, we consider the so-called uniquely decodable one-to-one code (UDOOC) that is formed by inserting a "comma" indicator, termed the unique word (UW), between consecutive one-to-one codewords for separation. Along this research direction, we ... More
Suppression of long-wavelength CMB spectrum from the Hartle-Hawking wave function in Starobinsky-type inflation modelMar 28 2019The lack of correlations on the large scale cosmic microwave background (CMB) anisotropy provides a potential window to probe beyond the standard inflationary scenario. In this paper, we investigate the primordial power spectrum based on the Hartle-Hawking ... More
N-barrier maximum principle for degenerate elliptic systems and its applicationSep 04 2016In this paper, we prove the N-barrier maximum principle, which extends the result in [5] from linear diffusion equations to nonlinear diffusion equations, for a wide class of degenerate elliptic systems of porous medium type. The N-barrier maximum principle ... More
Influences of source displacement on the features of subwavelength imaging of a photonic crystal slabDec 05 2010Dec 07 2010In this paper we study the characteristics of subwavelength imaging of a photonic crystal (PhC) superlens under the influence of source displacement. For square- and triangular-lattice photonic crystal lenses, we investigate the influence of changing ... More
HorizonNet: Learning Room Layout with 1D Representation and Pano Stretch Data AugmentationJan 12 2019We present a new approach to the problem of estimating 3D room layout from a single panoramic image. We represent room layout as three 1D vectors that encode, at each image column, the boundary positions of floor-wall and ceiling-wall, and the existence ... More
Fast Cycle Frequency Domain Feature Detection for Cognitive Radio SystemsMar 06 2009In cognitive radio systems, one of the main requirements is to detect the presence of the primary users' transmission, especially in weak signal cases. Cyclostationary detection is always used to solve weak signal detection, however, the computational ... More
Raman Gray Molasses Cooling of Cesium Atoms on the D2 LineJul 16 2018We present a systematic study on the Raman gray molasses cooling (RGMC) of cesium atoms on the $D_2$ transition. Due to the large splitting in the excited hyperfine transitions of cesium $D_2$ line, it is relatively simple to implement the RGMC with suitable ... More
Algorithms for Locating Constrained Optimal IntervalsSep 11 2008In this work, we obtain the following new results. 1. Given a sequence $D=((h_1,s_1), (h_2,s_2) ..., (h_n,s_n))$ of number pairs, where $s_i>0$ for all $i$, and a number $L_h$, we propose an O(n)-time algorithm for finding an index interval $[i,j]$ that ... More
Computation Diversity in Emerging Networking ParadigmsJan 21 2017May 09 2017Nowadays, computation is playing an increasingly more important role in the future generation of computer and communication networks, as exemplified by the recent progress in software defined networking (SDN) for wired networks as well as cloud radio ... More
Ab Initio Calculations of Exciton Radiative Lifetimes in Bulk Crystals, Nanostructures and MoleculesJan 25 2019Excitons are bound electron-hole pairs that dominate the optical response of semiconductors and insulators, especially in materials where the Coulomb interaction is weakly screened. Light absorption (including excitonic effects) has been studied extensively ... More
HorizonNet: Learning Room Layout with 1D Representation and Pano Stretch Data AugmentationJan 12 2019Apr 06 2019We present a new approach to the problem of estimating the 3D room layout from a single panoramic image. We represent room layout as three 1D vectors that encode, at each image column, the boundary positions of floor-wall and ceiling-wall, and the existence ... More
Out-of-plane spin polarization of edge currents in Chern insulator with Rashba spin-orbit interactionMay 03 2016We investigate the change in the non-zero Chern number and out-of-plane spin polarization of the edge currents in a honeycomb lattice with the Haldane-Rashba interaction. This interaction breaks the time-reversal symmetry due to the Haldane phase caused ... More
Accelerating and Evaluation of Syntactic Parsing in Natural Language Question Answering SystemsMar 01 2009Mar 10 2009With the development of Natural Language Processing (NLP), more and more systems want to adopt NLP in User Interface Module to process user input, in order to communicate with user in a natural way. However, this raises a speed problem. That is, if NLP ... More
Nucleon partonic spin structure to be explored by the unpolarized Drell-Yan program of COMPASS experiment at CERNJan 12 2015The observation of the violation of Lam-Tung relation in the $\pi N$ Drell-Yan process triggered many theoretical speculations. The TMD Boer-Mulders functions characterizing the correlation of transverse momentum and transverse spin for partons in unpolarized ... More
A Matlab toolbox for fractional relaxation-oscillation equationsFeb 14 2013Stress relaxation and oscillation damping of complex viscoelastic media often manifest history- and path-dependent physical behaviors and cannot accurately be described by the classical models. Recent research found that fractional derivative models can ... More
On the origin of orbital period change in WY Cancri: a genuine angular momentum loss?Apr 08 2013WY Cancri is a short-period ($P$=0.829 d) eclipsing RS Canum Venaticorum stars, and both components are late-type stars. Recently, observations provided by photometric observations and light time minima show that the orbital period of WY Cancri is experiencing ... More
A reference-searching-based algorithm for large-scale data envelopment analysis computationOct 28 2017Jul 27 2018Data envelopment analysis (DEA) is a linear program (LP)-based method used to determine the efficiency of a decision making unit (DMU), which transforms inputs to outputs, by peer comparison. This paper presents a new computation algorithm to determine ... More
Formation of Sco X-1 induced by anomalous magnetic braking of Ap/Bp starsAug 16 2017Aug 17 2017Sco X-1 is the brightest persistent X-ray in the sky. It is generally believed that Sco X-1 is a low-mass X-ray binary containing a neutron star accreting from a low-mass donor star where mass transfer is driven by the magnetic braking. However, the mass ... More