Collins, M. L. M., Chapman, S. C., Irwin, M. J., Martin, N. F., Ibata, R. A., Zucker, D. B., ...
We present the first spectroscopic analysis of the faint M31 satellite galaxies, AndXI and AndXIII, and a reanalysis of existing spectroscopic data for two further faint companions, And IX and...
The Structure of the Outer Galactic Disc as revealed by IPHAS early A Stars (2009)
Sale, S. E., Drew, J. E., Knigge, C., Zijlstra, A. A., Irwin, M. J., Morris, R. A. H., ...
This study is an investigation of the stellar density profile of the Galactic disc in the Anticentre direction. We select over 40,000 early A stars from IPHAS photometry in the Galactic longitude...
Deep Gemini/GMOS imaging of an extremely isolated globular cluster in the Local Group (2009)
Mackey, A. D., Ferguson, A. M. N., Irwin, M. J., Martin, N. F., Huxor, A. P., Tanvir, N. R., ...
We report on deep imaging of a remote M31 globular cluster, MGC1, obtained with Gemini/GMOS. Our colour-magnitude diagram for this object extends ~5 magnitudes below the tip of the red giant branch...
Candidate planetary nebulae in the IPHAS photometric catalogue (2009)
Viironen, K., Greimel, R., Corradi, R. L. M., Mampaso, A., Rodriguez, M., Sabin, L., ...
Context. We have carried out a semi-automated search for planetary nebulae (PNe) in the INT Photometric H-Alpha Survey (IPHAS) catalogue. We present the PN search and the list of selected candidates....
Substructure revealed by RR Lyraes in SDSS Stripe 82 (2009)
Watkins, L. L., Evans, N. W., Belokurov, V., Smith, M. C., Hewett, P. C., Bramich, D. M., ...
We present an analysis of the substructure revealed by 407 RR Lyraes in Sloan Digital Sky Survey (SDSS) Stripe 82. Period estimates are determined to high accuracy using a string-length method. A...
The IPHAS-POSS-I proper motion survey of the Galactic Plane (2009)
Deacon, N. R., Groot, P. J., Drew, J. E., Greimel, R., Hambly, N. C., Irwin, M. J., ...
We present a proper motion survey of the Galactic plane, using IPHAS data and POSS-I Schmidt plate data as a first epoch, that probes down to proper motions below 50 milliarcseconds per year. The...
The Discovery of Remote Globular Clusters in M33 (2009)
Huxor, A., Ferguson, A. M. N., Barker, M. K., Tanvir, N. R., Irwin, M. J., Chapman, S. C., ...
We present the discovery of four remote star clusters in M33, one of which is of an extended nature. Three of the clusters were discovered using survey data from the Isaac Newton Telescope Wide-Field...
Kinematics of SDSS subdwarfs: Structure and substructure of the Milky Way halo (2009)
Smith, M. C., Evans, N. W., Belokurov, V., Hewett, P. C., Bramich, D. M., Gilmore, G., ...
We construct a new sample of ~1700 solar neighbourhood halo subdwarfs from the Sloan Digital Sky Survey, selected using a reduced proper motion diagram. Radial velocities come from the SDSS spectra...
Blue straggler stars in dwarf spheroidal galaxies II: Sculptor and Fornax (2009)
Mapelli, M., Ripamonti, E., Battaglia, G., Tolstoy, E., Irwin, M. J., Moore, B., ...
The existence of blue straggler stars (BSSs) in dwarf spheroidal galaxies (dSphs) is still an open question. In fact, many BSS candidates have been observed in the Local Group dSphs, but it is...
An HST/ACS View of the Inhomogeneous Outer Halo of M31 (2009)
Richardson, J. C., Ferguson, A. M. N., Mackey, A. D., Irwin, M. J., Chapman, S. C., Huxor, A., ...
We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope Advanced Camera for Surveys (HST/ACS). We analyse...
On the Reported Death of the MACHO Era (2009)
Quinn, D. P., Wilkinson, M. I., Irwin, M. J., Marshall, J., Koch, A., Belokurov, V.
We present radial velocity measurements of four wide halo binary candidates from the sample in Chaname & Gould (2004; CG04) which, to date, is the only sample containing a large number of such...
Segue 2: A Prototype of the Population of Satellites of Satellites (2009)
Belokurov, V., Walker, M. G., Evans, N. W., Gilmore, G., Irwin, M. J., Mateo, M., ...
We announce the discovery of a new Milky Way satellite Segue 2 found in the data of the Sloan Extension for Galactic Understanding and Exploration (SEGUE). We followed this up with deeper imaging and...
Compiler-Directed Array Interleavingfor Reducing Energy in Multi-Bank Memories \Lambda (2009)
V. Delaluz, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam, I. Kolcuymicrosystems, Design Lab
Abstract With the increased use of embedded/portable devices suchas smart cellular phones, pagers, PDAs, hand-held computers, and CD players, improving energy efficiency is becominga critical issue....
A Keck/DEIMOS spectroscopic survey of the faint M31 satellites And XV and And XVI (2009)
Letarte, B., Chapman, S. C., Collins, M., Ibata, R. A., Irwin, M. J., Ferguson, A. M. N., ...
We present the results of a spectroscopic survey of the recently discovered M31 satellites And XV and And XVI, lying at projected distances from the centre of M31 of 93 and 130 kpc respectively....
IPHAS A-type stars with mid-infrared excesses in Spitzer surveys. (2009)
Hales, A., Barlow, M.J., Drew, J.E., Unruh, Y.C., Greimel, R., Irwin, M.J., ...
Original article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society. DOI: 10.1088/0004-637x/695/1/75 [Full text of this article is not available in the UHRA]
High spatial resolution Galactic 3D extinction mapping with IPHAS. (2009)
Sale, S.E., Drew, J.E., Unruh, Y.C., Irwin, M.J., Knigge, C., Phillips, S., ...
‘The definitive version is available at www3.interscience.wiley.com '. Copyright Blackwell Publishing / Royal Astronomical Society. DOI: 10.1111/j.1365-2966.2008.14083.x
Candidate planetary nebulae in the IPHAS photometric catalogue. (2009)
Viironen, K., Greimel, R., Corradi, R.L.M., Mampaso, A., Rodriguez, M., Sabin, L., ...
Original article can be found at: http://www.aanda.org/ Copyright European Southern Observatory. DOI: 10.1051/0004-6361/200912002
Temperature and Voltage Scaling Effects on Electrical Masking (2008)
R. Rajaraman, K. Ramakrishnan, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Abstract — Radiation induced soft errors in combinational logic is expected to become as important as directly induced errors on memory elements. Recent works have looked at modeling and estimating...
The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS (2008)
Hodgkin, S. T., Irwin, M. J., Hewett, P. C., Warren, S. J.
In this paper we describe the photometric calibration of data taken with the near-infrared Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope (UKIRT). The broadband ZYJHK data are...
Soft errors in adder circuits (2008)
R. Ramanarayanan, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Soft errors in combinational circuits are catching up with errors in memory elements [1]. Continuous device scaling and increasing pipeline lengths contribute to the increase in soft error rates in...
Implementing LDPC Decoding on Network-On-Chip (2008)
T. Theocharides, G. Link, N. Vijaykrishnan, M. J. Irwin
Low-Density Parity Check codes are a form of Error Correcting Codes used in various wireless communication applications and in disk drives. While LDPC codes are desirable due to their ability to...
SESEE: A Soft Error Simulation and Estimation Engine (2008)
V Degalahal, N Vijaykrishnan, M J Irwin
Soft errors are radiation induced ionization events that upset the logic state of the circuit. The sources of these radiations are cosmic in origin; hence traditionally these upsets affected the...
ABSTRACT Analyzing Heap Error Behavior in Embedded JVM Environments (2008)
G. Chen, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin
Recent studies have shown that transient hardware errors caused by external factors such as alpha particles and cosmic ray strikes can be responsible for a large percentage of system down-time....
High Spatial Resolution Galactic 3D Extinction Mapping with IPHAS (2008)
Sale, S. E., Drew, J. E., Unruh, Y. C., Irwin, M. J., Knigge, C., Phillipps, S., ...
We present an algorithm ({\scshape mead}, for `Mapping Extinction Against Distance') which will determine intrinsic ($r' - i'$) colour, extinction, and distance for early-A to K4 stars extracted from...
A planetary nebula around nova V458 Vul undergoing flash ionization (2008)
Wesson, R., Barlow, M. J., Corradi, R. L. M., Drew, J. E., Groot, P. J., Knigge, C., ...
Nova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of 8.1 a few days later. H$\alpha$ images obtained six weeks before the outburst as part of the IPHAS galactic plane survey...
Extremely red stellar objects revealed by IPHAS (2008)
Wright, N. J., Greimel, R., Barlow, M. J., Drew, J. E., Cioni, M. -R. L., Zijlstra, A. A., ...
We present photometric analysis and follow-up spectroscopy for a population of extremely red stellar objects extracted from the point-source catalogue of the INT Photometric H-Alpha Survey (IPHAS) of...
ABSTRACT Compiler-Directed Cache Polymorphism (2008)
J. S. Hu, N. Vijaykrishnan, M. J. Irwin, H. Saputra, W. Zhang
Classical compiler optimizations assume a xed cache architecture and modify the program to take best advantage of it. In some cases, this may not be the best strategy because each loop nest might...
Compiler Support for Reducing Leakage Consumption Energy (2008)
W. Zhang, N. Vijaykrishnan, M. J. Irwin, V. De
Current trends indicate that leakage energy consumption will be an important concern in upcoming process technologies. In this paper, we propose a compiler-based leakage energy optimization strategy....
J. S. Hu, N. Vijaykrishnan, M. J. Irwin, H. Saputra, W. Zhang
State-of-the-art microprocessors normally employ large cache structures; Fixed cache structures are wasted due to ineffective utilization; Traditional loop optimizations may not be available due to...
High Performance Array Processor for Video Decoding (2008)
J. Lee, N. Vijaykrishnan, M. J. Irwin
Abstract high NRE cost. Therefore, general purpose programmable processors using software to perform In this paper, high performance array processor for signal processing algorithms with high...
Variation Impact on SER of Combinational Circuits (2008)
K. Ramakrishnan, R. Rajaraman, S. Suresh, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Increasing variability not only affects the behavior of contemporary ICs but also their vulnerability to transient error phenomenon especially radiation induced soft errors. Such variations in device...
G. M. Link, N. Vijaykrishnan, M. J. Irwin
As technology scales, thermal issues are becoming a significant factor in chip design. Ever increasing transistor densities and increasing leakage currents result in high power dissipation, and...
T.Theocharides, G. Link, N. Vijaykrishnan, (2008)
Face detection is the first step towards face recognition and is a vital task in surveillance and security applications. Current software implementations of face detection algorithms lack the...
Impact of NBTI on FPGAs ∗ (2008)
K. Ramakrishnan, S. Suresh, N. Vijaykrishnan, M. J. Irwin
Device scaling such as reduced oxide thickness and high electric field has given rise to various reliability concerns. One such growing issue of concern is the degradation of PMOS devices due to...
Implementing LDPC Decoding on Network-On-Chip (2008)
T. Theocharides, G. Link, N. Vijaykrishnan, M. J. Irwin
Low-Density Parity Check (LDPC) codes are a form of Error Correcting Codes (ECC) used in various wireless communication applications and in disk drives. While LDPC codes are desirable due to their...
Light curves of five type Ia supernovae at intermediate redshift (2008)
Amanullah, R., Stanishev, V., Goobar, A., Schahmaneche, K., Astier, P., Balland, C., ...
Aims. We present multi-band light curves and distances for five type Ia supernovae at intermediate redshifts, 0.18 < z < 0.27. Methods. Three telescopes on the Canary Island of La Palma, INT, NOT,...
Leo V: A Companion of a Companion of the Milky Way Galaxy (2008)
Belokurov, V., Walker, M. G., Evans, N. W., Faria, D. C., Gilmore, G., Irwin, M. J., ...
We report the discovery of a new Milky Way dwarf spheroidal galaxy in the constellation of Leo identified in data from the Sloan Digital Sky Survey. Leo V lies at a distance of about 180 kpc, and is...
M.J.: Thermal-Aware Task Allocation and Scheduling for Embedded Systems (2008)
W-l. Hung, Y. Xie, N. Vijaykrishnan, M. J. Irwin
Temperature affects not only the reliability but also the performance, power, and cost of the embedded system. This paper proposes a thermal-aware task allocation and scheduling algorithm for...
AN EFFICIENT IMPLEMENTATION OF HIERARCHICAL IMAGE CODING (2008)
J. Lee, N. Vijaykrishnan, M. J. Irwin, R. Ch
ABSTRACT The third issues are compatibility and scalability. An efficient technique for hierarchical image coding is proposed, which divides an image into its multiple resolution versions with...
ÔÖÓÔÓ×� � �ÖÓÛ×Ý � � � Ø��Ø �ÝÒ�Ñ � �ÐÐÝ × �Ð� × ÚÓÐØ��� × �ÓÖ (2008)
J. S. Hu, A. Nadgir, N. Vijaykrishnan, M. J. Irwin
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Reducing dTLB Energy Through Dynamic Resizing £ (2008)
V. Delaluz, A. Sivasubramaniam, M. J. Irwin, N. Vijaykrishnan
Translation Look-aside Buffer (TLB), which is small Content Addressable Memory (CAM) structure used to translate virtual addresses to physical addresses, can consume significant energy in some...
J. S. Hu, N. Vijaykrishnan, M. J. Irwin, H. Saputra, W. Zhang
Ú�ÖÝ �« � Ø�Ú � �Ò ¬Ò��Ò � Ø� � Ò��Ö ÓÔØ�Ñ�Ð ��Ø � � � � ÓÒ¬�Ù Ö�Ø�ÓÒ × �ÓÖ ��«�Ö�ÒØ Ò�×Ø × �Ò...
Temperature and Voltage Scaling Effects on Electrical Masking (2008)
R. Rajaraman, K. Ramakrishnan, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Abstract — Radiation induced soft errors in combinational logic is expected to become as important as directly induced errors on memory elements. Recent works have looked at modeling and estimating...
fgchen,kandemir,vijay,mjigcse.psu.edu (2008)
G. Chen, N. Vijaykrishnan, M. J. Irwin, M. Wolczko
Java is becoming the main software platform for consumer and embedded devices such as mobile phones, PDAs, TV set-top boxes, and in-vehicle systems. Since many of these systems are memory...
Early-A stars from IPHAS, and their distribution in and around the Cyg OB2 association. (2008)
Drew, J.E., Greimel, R., Irwin, M.J., Sale, S.E.
‘The definitive version is available at www.blackwell-synergy.com.’ Copyright Blackwell Publishing DOI: 10.1111/j.1365-2966.2008.13147.x
Gonzalez-Solares, E., Walton, N.A., Greimel, R., Drew, J.E., Irwin, M.J., Sale, S.E., ...
‘The definitive version is available at www.blackwell-synergy.com.’ Copyright Blackwell Publishing DOI: 10.1111/j.1365-2966.2008.13399.x
A planetary nebula around Nova V458 Vulpeculae undergoing flash ionization. (2008)
Wesson, R., Barlow, M.J., Corradi, R.L.M., Drew, J.E., Groot, P., Knigge, C., ...
Original article can be found at: http://www.iop.org/EJ/journal/apjl Copyright American Astronomical Society [Full text of this article is not available in the UHRA]
The luminosity function of the Milky Way satellites (2008)
Koposov, S., Belokurov, V., Evans, N. W., Hewett, P. C., Irwin, M. J., Gilmore, G., ...
Bellazzini, M., Ibata, R. A., Chapman, S. C., Mackey, A. D., Monaco, L., Irwin, M. J., ...
We present the results of a thorough study of the nucleus of the Sgr dwarf spheroidal galaxy (Sgr dSph) and of the bright globular cluster M54 (NGC 6715) that resides within the same nucleus (Sgr,N)....
Leo V: a companion of a companion of the Milky Way Galaxy? (2008)
Belokurov, V., Walker, M. G., Evans, N. W., Faria, D. C., Gilmore, G., Irwin, M. J., ...
We report the discovery of a new Milky Way satellite in the constellation Leo, identified in data from the Sloan Digital Sky Survey. It lies at a distance of ~180 kpc, and is separated by
Extremely red stellar objects revealed by IPHAS. (2008)
Wright, N., Greimel, R., Barlow, M.J., Drew, J.E., Cioni, M-R.L., Zijlstra, A.A., ...
The original article can be found at: http://www3.interscience.wiley.com Copyright Blackwell Publishing. DOI: 10.1111/j.1365-2966.2008.13851.x
Though observationally rare, damped Lyff absorption systems dominate the mass density of neutral gas in the Universe. Eleven high redshift damped Lyff systems covering 2.8! z! 4.4 were discovered in...
A Search For Binaries In The Globular Cluster NGC 3201 (2007)
Patrick Côté, Douglas L. Welch, Philippe Fischer, Peter Tamblyn, ...
We present BV CCD and APM photometry, accurate astrometry and 1859 radial velocities for 1318 stars within ¸ 36 0 of the Galactic globular cluster NGC 3201. The field and cluster populations...
L. Li, I. Kadayif, Y-f. Tsai, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam
Energy management is important for a spectrum of systems ranging from high-performance architectures to lowend mobile and embedded devices. With the increasing number of transistors, smaller feature...
S. Kim, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin, E. Geethanjali
This paper focuses on partitioning the cache resources architecturally for energy and energy-delay optimizations. Specifically, we investigate ways of splitting the cache into several smaller units,...
INPUT SENSITIVE HIGH-LEVEL POWER ANALYSIS (2007)
J. Hezavei, M. J. Irwin, D. Duarte
Abstract-- In this paper, an input sensitive table based power estimation technique is proposed. The proposed technique has been applied to different circuits and validated using circuit-level...
Instruction Cache Leakage Management ABSTRACT (2007)
J. S. Hu, A. Nadgir, N. Vijaykrishnan, M. J. Irwin
Leakage energy optimization for caches has been the target of much recent effort. In this work, we focus on instruction caches and tailor two techniques that exploit the two major factors that shape...
HARDWARE/SOFTWARE CO-DESIGN FOR REAL- TIME PHYSICAL MODELING (2007)
B. Bishop, T. P. Kelliher, M. J. Irwin
Physical modeling of a mass-spring system allows for realistic object motion and deformation in a virtual environment. Previous work in this type of physical modeling relies on general-purpose...
Energy Optimization Using Object Co-Location in Java (2007)
S. Tomar, N. Vijaykrishnan, R. Shetty, M. J. Irwin
With the paradigm shift in computer systems towards ubiquitous computing, energy, together with performance, has become an important parameter to measure efficiency. Java is increasingly becoming the...
I. M. Hook, R. G. Mcmahon, A. R. Patnaik, P. N. Wilkinson, M. J. Irwin, ...
GB1508+5714: a radio-loud quasar with z=4.30 and the space density of high redshift, radio--loud quasars
I. M. Hook, R. G. Mcmahon, M. J. Irwin, C. Hazard
We present optical spectroscopic data for a complete sample of 161 S5GHz 0:2Jy, flatspectrum radio sources. The sources were observed as part of a survey for high redshift, radio-loud quasars, and...
The variability of optically selected quasars I. M. Hook, 1 (2007)
R. G. Mcmahon, B. J. Boyle, M. J. Irwin
The variability properties of a sample of 300 optically selected quasars near the South Galactic Pole (SGP) have been studied over a baseline of 16 years using a series of twelve UK Schmidt Telescope...
Exploiting Value Locality for Secure-Energy Aware Communication (2007)
H. Saputra, N. Vijaykrishnan, M. Kandemir, R. Brooks, M. J. Irwin
Minimizing energy consumption is important for prolonging the life of battery-powered sensor nodes. A major portion of a sensor power budget in a distributed sensor network is consumed by...
I. M. Hook, R. G. Mcmahon, M. J. Irwin, C. Hazard
We present optical spectroscopic data for a complete sample of 161 S5GHz 0:2Jy, flatspectrum radio sources. The sources were observed as part of a survey for high redshift, radio-loud quasars, and...
Masking the Energy Behavior of Encryption Algorithms (2007)
H. Saputra, N. Vijaykrishnan, M. J. Irwin, R. Brooks
Smart cards are vulnerable to both invasive and non-invasive attacks. Specifically, non-invasive attacks using power and timing measurements to extract the cryptographic key has drawn a lot of...
Reducing dTLB Energy Through Dynamic Resizing (2007)
V. Delaluz, A. Sivasubramaniam, M. J. Irwin, N. Vijaykrishnan
Translation Look-aside Buffer (TLB), which is small Content Addressable Memory (CAM) structure used to translate virtual addresses to physical addresses, can consume significant energy in some...
Scheduling Reusable Instructions for Power Reduction (2007)
J. S. Hu, N. Vijaykrishnan, S. Kim, M. Kandemir, M. J. Irwin
In this paper, we propose a new issue queue design that is capable of scheduling reusable instructions. Once the issue queue is reusing instructions, no instruction cache access is needed since the...
A GENERIC RECONFIGURABLE NEURAL NETWORK ARCHITECTURE IMPLEMENTED AS A NETWORK ON CHIP (2007)
T. Theocharides, G. Link, N. Vijaykrishnan, M. J. Irwin
Neural Networks are widely used in pattern recognition, security applications and data manipulation. We propose a novel hardware architecture for a generic neural network, using Network on Chip (NoC)...
New UltraCool and Halo White Dwarf Candidates in SDSS Stripe 82 (2007)
Vidrih, S., Bramich, D. M., Hewett, P. C., Evans, N. W., Gilmore, G., Hodgkin, S., ...
A 2.5 x 100 degree region along the celestial equator (Stripe 82) has been imaged repeatedly from 1998 to 2005 by the Sloan Digital Sky Survey. A new catalogue of ~4 million light-motion curves,...
A very cool brown dwarf in UKIDSS DR1 (2007)
Warren, S. J., Mortlock, D. J., Leggett, S. K., Pinfield, D. J., Homeier, D., Dye, S., ...
(abridged) We report the discovery of a very cool brown dwarf, ULAS J003402.77-005206.7 (ULAS J0034-00), identified in UKIDSS DR1. We provide optical, near-infrared, and mid-infrared photometry of...
The Luminosity Function of the Milky Way Satellites (2007)
Koposov, S., Belokurov, V., Evans, N. W., Hewett, P. C., Irwin, M. J., Gilmore, G., ...
We quantify the detectability of stellar Milky Way satellites in the Sloan Digital Sky Survey (SDSS) Data Release 5. We show that the effective search volumes for the recently discovered...
Spectroscopic observations of eight supernovae at intermediate redshift (2007)
Balland, C., Mouchet, M., Amanullah, R., Astier, P., Fabbro, S., Folatelli, G., ...
We present spectra of six Type Ia and two Type II supernovae obtained in June 2002 at the William Herschel Telescope during a search for Type Ia supernovae (SNIa) at intermediate redshift. Supernova...
The Hercules-Aquila Cloud (2007)
Belokurov, V., Evans, N. W., Bell, E. F., Irwin, M. J., Hewett, P. C., Koposov, S., ...
We present evidence for a substantial overdensity of stars in the direction of the constellations of Hercules and Aquila. The Cloud is centered at a Galactic longitude of about 40 degrees and extends...
Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way (2007)
Irwin, M. J., Belokurov, V., Evans, N. W., Ryan-Weber, E. V., Koposov, S., ...
In this Letter, we announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The...
Draco, a flawless dwarf galaxy (2007)
Ségall, M., Ibata, R. A., Irwin, M. J., Martin, N. F., Chapman, S.
The Draco dwarf spheroidal galaxy (dSph), with its apparent immense mass-to-light ratio and compact size, holds many clues to the nature of the enigmatic dark matter. Here we present deep photometric...
The discovery of two extremely low luminosity Milky Way globular clusters (2007)
Koposov, S., Belokurov, V., Rix, H. W., Zucker, D. B., Evans, N. W., ...
We report the discovery of two extremely low luminosity globular clusters in the Milky Way halo. These objects were detected in the Sloan Digital Sky Survey Data Release 5 and confirmed with deeper...
Discovery of an unusual dwarf galaxy in the outskirts of the Milky Way (2007)
Irwin, M. J., Belokurov, V., Evans, N. W., Ryan-Weber, E. V., Koposov, S., ...
We announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude...
Cats and dogs, hair and a hero: a quintet of New Milky Way companions (2007)
Belokurov, V., Zucker, D. B., Evans, N. W., Kleyna, J. T., Koposov, S., Hodgkin, S. T., ...
We present five new satellites of the Milky Way discovered in Sloan Digital Sky Survey (SDSS) imaging data, four of which were followed up with either the Subaru or the Isaac Newton Telescopes. They...
An Orphan in the ``Field of Streams'' (2007)
Belokurov, V., Evans, N. W., Irwin, M. J., Lynden-Bell, D., Yanny, B., Vidrih, S., ...
We use Sloan Digital Sky Survey Data Release 5 photometry and spectroscopy to study a tidal stream that extends over ~50° in the north Galactic cap. From the analysis of the path of the stream and...
The Hercules-Aquila cloud (2007)
Belokurov, V., Evans, N. W., Bell, E. F., Irwin, M. J., Hewett, P. C., Koposov, S., ...
We present evidence for a substantial overdensity of stars in the direction of the constellations of Hercules and Aquila. The cloud is centered at a Galactic longitude of l~40deg and extends above...
A very cool brown dwarf in UKIDSS DR1. (2007)
Warren, S.J., Mortlock, D.J., Leggett, S., Pinfield, D.J., Homeier, D., Dye, S., ...
Discovery of an unusual dwarf galaxy in the outskirts of the Milky Way (2007)
Irwin, M. J., Belokurov, V., Evans, N. W., Ryan-Weber, E. V., Koposov, S., ...
We announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude...
Discovery of an unusual dwarf galaxy in the outskirts of the Milky Way (2007)
Irwin, M. J., Belokurov, V., Evans, N. W., Ryan-Weber, E. V., Koposov, S., ...
We announce the discovery of a new dwarf galaxy, Leo T, in the Local Group. It was found as a stellar overdensity in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). The color-magnitude...
Inside the whale: the structure and dynamics of the isolated Cetus dwarf spheroidal (2006)
Lewis, G. F., Ibata, R. A., Chapman, S. C., McConnachie, A., Irwin, M. J., Tolstoy, E., ...
This paper presents a study of the Cetus dwarf, an isolated dwarf galaxy within the Local Group. A matched-filter analysis of the INT/WFC imaging of this system reveals no evidence for significant...
Is Ursa Major II the Progenitor of the Orphan Stream? (2006)
Fellhauer, M., Evans, N. W., Belokurov, V., Zucker, D. B., Yanny, B., Wilkinson, M. I., ...
Prominent in the `Field of Streams' -- the Sloan Digital Sky Survey map of substructure in the Galactic halo -- is an `Orphan Stream' without obvious progenitor. In this numerical study, we show a...
The UKIRT infrared deep sky survey early data release (2006)
Dye, S., Warren, S.J., Hambly, N.C., Cross, N.J.G., Hodgkin, S.T., Irwin, M.J., ...
This paper defines the UKIRT Infrared Deep Sky Survey (UKIDSS) Early Data Release (EDR). UKIDSS is a set of five large near-infrared surveys being undertaken with the United Kingdom Infrared...
The UKIRT Infrared Deep Sky Survey First Data Release (2006)
Warren, S. J., Hambly, N. C., Dye, S., Almaini, O., Cross, N. J. G., Edge, A. C., ...
The First Data Release (DR1) of the UKIRT Infrared Deep Sky Survey (UKIDSS) took place on 2006 July 21. UKIDSS is a set of five large near-infrared surveys, covering a complementary range of areas,...
Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Kleyna, J. T., Koposov, S., Hodgkin, S. T., ...
We present five new satellites of the Milky Way discovered in Sloan Digital Sky Survey (SDSS) imaging data, four of which were followed-up with either the Subaru or the Isaac Newton Telescopes. They...
Martin, N. F., Ibata, R. A., Irwin, M. J., Chapman, S., Lewis, G. F., Ferguson, A. M. N., ...
We present the discovery of three faint dwarf galaxies and a globular cluster in the halo of the Andromeda galaxy (M31), found in our MegaCam survey that spans the southern quadrant of M31, from a...
Burleigh, M. R., Marsh, T. R., Gansicke, B. T., Goad, M. R., Dhillon, V. S., Littlefair, S. P., ...
Optical time series photometry of the short period magnetic white dwarf + probable brown dwarf binary SDSS 121209.31+013627.7 reveals pulse-like variability in all bands from i' to u', peaking at u'....
A Curious New Milky Way Satellite in Ursa Major (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Kleyna, J. T., Irwin, M. J., Wilkinson, M. I., ...
In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging....
An Orphan in the "Field of Streams" (2006)
Belokurov, V., Evans, N. W., Irwin, M. J., Lynden-Bell, D., Yanny, B., Vidrih, S., ...
We use Sloan Digital Sky Survey Data Release 5 photometry and spectroscopy to study a tidal stream that extends over 50 degrees in the North Galactic Cap. From the analysis of the path of the stream...
The Field of Streams: Sagittarius and its Siblings (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Gilmore, G., Vidrih, S., Bramich, D. M., ...
We use Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) u,g,r,i,z photometry to study Milky Way halo substructure in the area around the North Galactic Cap. A simple color cut (g-r < 0.4) reveals...
The Origin of the Bifurcation in the Sagittarius Stream (2006)
Fellhauer, M., Belokurov, V., Evans, N. W., Wilkinson, M. I., Zucker, D. B., Gilmore, G., ...
The latest Sloan Digital Sky Survey data reveal a prominent bifurcation in the distribution of debris of the Sagittarius dwarf spheroidal (Sgr) beginning at a right ascension of roughly 190 degrees....
The UKIRT Infrared Deep Sky Survey (UKIDSS) (2006)
Lawrence, A., Warren, S. J., Almaini, O., Edge, A. C., Hambly, N. C., Jameson, R. F., ...
We describe the goals, design, implementation, and initial progress of the UKIRT Infrared Deep Sky Survey (UKIDSS), a seven year sky survey which began in May 2005, using the UKIRT Wide Field Camera....
A New Milky Way Dwarf Satellite in Canes Venatici (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Sivarani, T., ...
In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the North Galactic Cap using...
A Faint New Milky Way Satellite in Bootes (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Hodgkin, S., ...
In this Letter, we announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of 60 kpc. It was found in a systematic search for stellar overdensities in...
Planetary Nebula Velocities in the Disk and Bulge of M31 (2006)
Halliday, C., Carter, D., Bridges, T. J., Jackson, Z. C., Wilkinson, M. I., Quinn, D. P., ...
We present radial velocities for a sample of 723 planetary nebulae (PNe) in the disk and bulge of M31, measured using the WYFFOS fibre spectrograph on the William Herschel telescope. Velocities are...
Burleigh, Matthew R., Marsh, T.R., Gänsicke, B.T., Goad, Michael R., Dhillon, V.S., Littlefair, S.P., ...
Submitted for publication in Monthly Notices of the Royal Astronomical Society by the Royal Astronomical Society and Blackwell Publishing.
A new Milky Way dwarf satellite in Canes Venatici (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Sivarani, T., ...
In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the north Galactic cap using...
A curious Milky Way satellite in Ursa Major (2006)
Zucker, D. B., Belokurov, V., Evans, N. W., Kleyna, J. T., Irwin, M. J., Wilkinson, M. I., ...
In this Letter, we study a localized stellar overdensity in the constellation of Ursa Major, first identified in Sloan Digital Sky Survey (SDSS) data and subsequently followed up with Subaru imaging....
A faint new Milky Way satellite in Bootes (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Wilkinson, M. I., Irwin, M. J., Hodgkin, S., ...
We announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of ~60 kpc. It was found in a systematic search for stellar overdensities in the north...
The field of streams: Sagittarius and its siblings (2006)
Belokurov, V., Zucker, D. B., Evans, N. W., Gilmore, G., Vidrih, S., Bramich, D. M., ...
We use Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) u, g, r, i, z photometry to study Milky Way halo substructure in the area around the north Galactic cap. A simple color cut (g-r
SEAT-LA: A soft error analysis tool for combinational logic (2006)
R. Rajaraman, J. S. Kim, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Radiation induced soft errors in combinational logic is expected to become as important as directly induced errors on state elements. Consequently, it has become important to develop techniques to...
SEAT-LA: A soft error analysis tool for combinational logic (2006)
R. Rajaraman, R. Rajaraman, J. S. Kim, J. S. Kim, N. Vijaykrishnan, N. Vijaykrishnan, ...
this paper, we propose a new approach, which can be applied to designs that use cell libraries characterized for soft error analysis and utilizes analytical equations to model the propagation of a...
The Discovery of Tidal Tails Around NGC 5466 (2005)
Belokurov, V., Evans, N. W., Irwin, M. J., Hewett, P. C., Wilkinson, M. I.
We report the discovery of tidal tails around the high-latitude Galactic globular cluster NGC 5466 in Sloan Digital Sky Survey (SDSS) data. Neural networks are used to reconstruct the probability...
Distances and metallicities for 17 local group galaxies (2005)
McConnachie, A. W., Irwin, M. J., Ferguson, A. M. N., Ibata, R. A., Lewis, G. F., Tanvir, N.
Analysis of Error Recovery Schemes for Networks on Chips (2005)
Murali, S., De Micheli, G., Benini, L., Theocharides, T., Vijaykrishnan, N., Irwin, M.J.
In this article, we discuss design constraints to characterize efficient error recovery mechanisms for the NoC design environment. We explore error control mechanisms at the data link and network...
A new population of extended, luminous star clusters in the halo of M31 (2005)
Huxor, A.P., Tanvir, Nial R., Irwin, M.J., Ibata, R., Collett, J.L., Ferguson, A.M.N., ...
Thermal-Aware Task Allocation and Scheduling for Embedded Systems (2005)
Xie, Y., Vijaykrishnan, N., Kandemir, M., Irwin, M. J.
Temperature affects not only the reliability but also the performance, power, and cost of the embedded system. This paper proposes a thermal-aware task allocation and scheduling algorithm for...
The INT Photometric Ha Survey of the Northern Galactic Plane (IPHAS). (2005)
Drew, J.E., Greimel, R., Irwin, M.J., Aungwerojwit, A., Barlow, M.J., Corradi, R.L.M., ...
Thermal-Aware Task Allocation and Scheduling for Embedded Systems (2005)
Xie, Y., Vijaykrishnan, N., Kandemir, M., Irwin, M. J.
Temperature affects not only the reliability but also the performance, power, and cost of the embedded system. This paper proposes a thermal-aware task allocation and scheduling algorithm for...
Thermal-aware floorplanning using genetic algorithms (2005)
W-l. Hung, Y. Xie, N. Vijaykrishnan, C. Addo-quaye, T. Theocharides, M. J. Irwin
In this work, we present a genetic algorithm based thermal-aware floorplanning framework that aims at reducing hot spots and distributing temperature evenly across a chip while optimizing the...
PennBench: A benchmark suite for embedded Java (2005)
G. Chen, N. Vijaykrishnan, M. J. Irwin
Currently, there are 23 million Java-enabled handsets with more than 50 different models from 17-plus suppliers. With the growing popularity of such devices, there is a need in the embedded industry...
The INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS) (2005)
Drew, Janet E, Greimel, R, Parker, Q. A, Irwin, M. J, Aungwerojwit, A, Barlow, M. J, ...
The Isaac Newton Telescope (INT) Photometric Hα Survey of the Northern Galactic Plane (IPHAS) is a 1800-deg² CCD survey of the northern Milky Way spanning the latitude range −5° < b < + 5° and...
Tolstoy, Eline, Irwin, M. J., Helmi, A., Battaglia, G., Jablonka, P., Hill, V., ...
We have found evidence for the presence of two distinct ancient stellar components (both geq 10 Gyr old) in the Sculptor dwarf spheroidal galaxy. We used the ESO Wide Field Imager (WFI) in...
Distances and Metallicities for 17 Local Group Galaxies (2004)
McConnachie, A. W., Irwin, M. J, Ferguson, A. M. N., Ibata, R. A., Lewis, G. F., Tanvir, N.
We have obtained Johnson V and Gunn i photometry for a large number of Local Group galaxies using the Isaac Newton Telescope Wide Field Camera (INT WFC). The majority of these galaxies are members of...
Kinematically Cold Populations at Large Radii in the Draco and Ursa Minor Dwarf Spheroidals (2004)
Wilkinson, M. I., Kleyna, J. T., Evans, N. W., Gilmore, G. F., Irwin, M. J., Grebel, E. K.
We present projected velocity dispersion profiles for the Draco and Ursa Minor (UMi) dwarf spheroidal galaxies based on 207 and 162 discrete stellar velocities, respectively. Both profiles show a...
Lewis, G. F., Ibata, R. A., Chapman, S. C., Ferguson, A. M. N., McConnachie, A. W., Irwin, M. J., ...
The effect of threshold voltages on soft error rate (2004)
V. Degalahal, R. Ramanarayanan, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Reliability-aware co-synthesis for embedded systems (2004)
L. Li, Y. Xie, N. Vijaykrishnan, M. J. Irwin
As technology scales, transient faults due to single event upsets have emerged as a key challenge for reliable embedded system design. This paper proposes a design methodology that incorporates...
Inverse Discrete Cosine Transform Architecture Exploiting (2004)
J. Lee, N. Vijaykrishnan, M. J. Irwin
ABSTRACT A row-column decomposition method has been In this paper, a novel architecture for 2-D IDCT is proposed, based on the sparseness property of 2-D DCT coefficient matrix and the even and odd...
W. Hung, Y. Xie, N. Vijaykrishnan, M. J. Irwin, Y. Tsai
In this paper, we present an algorithm for the minimization of total power consumption via multiple V DD assignment, multiple V TH assignment, device sizing and stack forcing, while maintaining...
An Architecture for Motion Estimation in the Transform Domain (2004)
J. Lee, N. Vijaykrishnan, M. J. Irwin, W. Wolf
In this paper, a novel architecture for transform domain motion estimation is proposed. We derive a recursion equation from the algorithm and wavefront array processors are used to perform motion...
Improving Soft-Error Tolerance of FPGA Configuration Bits (2004)
Suresh Srinivasan, Aman Gayasen, N. Vijaykrishnan, Y. Xie, M. J. Irwin
Abstract — Soft errors that change configuration bits of an SRAM based FPGA modify the functionality of the design. The proliferation of FPGA devices in various critical applications makes it...
Thermal-Aware IP Virtualization and Placement for Networks-on-Chip Architecture (2004)
W. Hung, C. Addo-quaye, T. Theocharides, Y. Xie, N. Vijaykrishnan, M. J. Irwin
Networks-on-Chip (NoC), a new SoC paradigm, has been proposed as a solution to mitigate complex on-chip interconnect problems. NoC architecture consists of a collection of IP cores or processing...
Efficient VLSI Implementation of Inverse Discrete Cosine Transform (2004)
J. Lee, N. Vijaykrishnan, M. J. Irwin
In this paper, a novel 2-D IDCT architecture based on the energy compaction property of 2-D DCT is proposed. This architecture performs 2-D IDCT directly on the 2-D DCT data set, avoiding the need...
Reducing leakage energy in fpgas using region-constrained placement (2004)
A. Gayasen, Y. Tsai, N. Vijaykrishnan, M. J. Irwin
FPGAs are being increasingly used in a wide variety of applications. While power optimization has been only of secondary importance in many FPGA applications, growing importance of leakage in FPGAs...
A Dual-VDD Low Power FPGA Architecture (2004)
Gayasen Lee Vijaykrishnan, A. Gayasen, K. Lee, N. Vijaykrishnan, M. J. Irwin, T. Tuan
The continuing increase in FPGA size and complexity and the emergence of sub-100nm technology have made FPGA power consumption, both dynamic and static, an important design consideration. In this...
Fault Tolerant Algorithms for Network-On-Chip Interconnect (2004)
Pirretti Link Brooks, M. Pirretti, G. M. Link, R. R. Brooks, N. Vijaykrishnan, M. J. Irwin
As technology scales, fault tolerance is becoming a key concern in on-chip communication. Consequently, this work examines fault tolerant communication algorithms for use in the NoC domain. Two...
Reliability-Aware Co-synthesis for Embedded Systems (2004)
Xie Li Kandemir, Y. Xie, L. Li, N. Vijaykrishnan, M. J. Irwin
As technology scales, transient faults due to single event upsets have emerged as a key challenge for reliable embedded system design. This paper proposes a design methodology that incorporates...
Banked scratch-pad memory management for reducing leakage energy consumption (2004)
Current trends indicate that leakage energy consumption will be an important concern in upcoming process technologies. In this paper, we propose a compiler-based leakage energy optimization strategy...
Implications of Technology Scaling on Leakage Reduction Techniques (2004)
Y-f. Tsai, N. Vijaykrishnan, M.J. Irwin
The impact of technology scaling on three run-time leakage reduction techniques (Input Vector Control, Body Bias Control and Power Supply Gating) is evaluated by determining limits and benefits, in...
A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion onto the Milky Way (2003)
Martin, N. F., Ibata, R. A., Bellazzini, M., Irwin, M. J., Lewis, G. F., Dehnen, W.
We present an analysis of the asymmetries in the population of Galactic M-giant stars present in the 2MASS All Sky catalogue. Several large-scale asymmetries are detected, the most significant of...
The three-dimensional structure of the giant stellar stream in Andromeda (2003)
McConnachie, A. W., Irwin, M. J., Ibata, R. A., Ferguson, A. M . N., Lewis, G. F., Tanvir, N.
The three-dimensional structure of the giant stellar stream in Andromeda (2003)
McConnachie, A. W., Irwin, M. J., Ibata, R. A., Ferguson, A. M . N., Lewis, G. F., Tanvir, N.
Energy-aware code cache management for memory-constrained Java devices (2003)
G. Chen, G. Chen, N. Vijaykrishnan, M. J. Irwin
that support both interpretation and compiled execution, se-This paper focuses on the influence of memory size limitation on the dynamic translation of Java methods into native code. Specifically, we...
Compiler support for reducing leakage energy consumption (2003)
W. Zhang, N. Vijaykrishnan, M. J. Irwin, V. De
Current trends indicate that leakage energy consumption will be an important concern in upcoming process technologies. In this paper, we propose a compiler-based leakage energy optimization strategy....
Masking the Energy Behavior of DES Encryption (2003)
H. Saputra, N. Vijaykrishnan, M. J. Irwin, R. Brooks, S. Kim, W. Zhang
Smart cards are vulnerable to both invasive and non-invasive attacks. Specifically, non-invasive attacks using power and timing measurements to extract the cryptographic key has drawn a lot of...
Masking the Energy Behavior of DES Encryption (2003)
H. Saputra, N. Vijaykrishnan, M. J. Irwin, R. Brooks, S. Kim, W. Zhang
Smart cards are vulnerable to both invasive and non-invasive attacks. Specifically, non-invasive attacks using power and timing measurements to extract the cryptographic key has drawn a lot of...
Compiler support for reducing leakage energy consumption (2003)
W. Zhang, N. Vijaykrishnan, M. J. Irwin, V. De
Current trends indicate that leakage energy consumption will be an important concern in upcoming process technologies. In this paper, we propose a compiler-based leakage energy optimization strategy....
Analysis of Soft Error Rate in FlipFlops and Scannable Latches (2003)
R. Ramanarayanan, V. Degalahal, N. Vijaykrishnan, M. J. Irwin, D. Duarte
Abstract—Soft the critical charge by increasing the gate capacitance while errors are gaining importance as technology scales. Flip-flops, an important component of pipelined architectures, are...
Heap Compression for Memory-Constrained Java Environments (2003)
G. Chen, M. Kandemir, N. Vijaykrishnan, M. J. Irwin, B. Mathiske, M Wolczko
Java is becoming the main software platform for consumer and embedded devices such as mobile phones, PDAs, TV set-top boxes, and in-vehicle systems. Since many of these systems are memory...
Tracking Object Life Cycle for Leakage Energy (2003)
Optimization Chen Vijaykrishnan, G. Chen, N. Vijaykrishnan, M. J. Irwin
The focus of this work is on utilizing the state of objects during their lifespan in optimizing the leakage energy consumed in the data caches when executing embedded Java applications. Our analysis...
On Load Latency in Low-Power Caches (2003)
Soontae Kim Vijaykrishnan, N. Vijaykrishnan, M. J. Irwin, L. K. John
Many of the recently proposed techniques to reduce power consumption in caches introduce an additional level of nondeterminism in cache access latency. Due to this additional latency, instructions...
Energy-aware Compilation and Execution in Java-Enabled Mobile Devices (2003)
G. Chen, B. Kang, N. Vijaykrishnan, M. J. Irwin
Java-enabled wireless devices are preferred for various reasons such as enhanced user experience and the support for dynamically downloading applications on demand. The dynamic download capability...
On Load Latency in Low-Power Caches (2003)
Soontae Kim, N. Vijaykrishnan, M. J. Irwin, L. K. John
Many of the recently proposed techniques to reduce power consumption in caches introduce an additional level of nondeterminism in cache access latency. Due to this additional latency, instructions...
The distant Type Ia supernova rate (2002)
Pain, R., Fabbro, S., Sullivan, M., Ellis, R. S., Aldering, G., Astier, P., ...
We present a measurement of the rate of distant Type Ia supernovae derived using 4 large subsets of data from the Supernova Cosmology Project. Within this fiducial sample, which surveyed about 12...
Tuning garbage collection for reducing memory system energy in an embedded Java environment (2002)
G. Chen, R. Shetty, M. Kandemir, N. Vijaykrishnan, M. J. Irwin, M. Wolczko
Java has been widely adopted as one of the software platforms for the seamless integration of diverse computing devices. Over the last year, there has been great momentum in adopting Java technology...
Compiler-directed cache polymorphism (2002)
J. S. Hu, N. Vijaykrishnan, M. J. Irwin, H. Saputra, W. Zhang
Classical compiler optimizations assume a xed cache architecture and modify the program to take best advantage of it. In some cases, this may not be the best strategy because each loop nest might...
Scheduler-based DRAM energy management (2002)
V. Delaluz, A. Sivasubramaniam, N. Vijaykrishnan, M. J. Irwin
Previous work on DRAM power-mode management focused on hardware-based techniques and compiler-directed schemes to explicitly transition unused memory modules to low-power operating modes. While...
Energy-Conscious Compilation based on Voltage Scaling (2002)
H. Saputra, M. J. Irwin, J. S. Hu
As energy consumption has become a major constraint in current system design, it is essential to look beyond the traditional low-power circuit and architectural optimizations. Further, software is...
Predictive Precharging for Bitline Leakage Energy Reduction (2002)
Soontae Kim, N. Vijaykrishnan, M. J. Irwin
Abstract | As technology scales down into deepsubmicron, leakage energy is becoming a dominant source of energy consumption. Leakage energy is generally proportional to the area of a circuit and...
Impact of technology scaling and packaging on dynamic voltage scaling techniques (2002)
D. Duarte, N. Vijaykrishnan, M. J. Irwin, Y-f. Tsai
This paper studies how the effectiveness of various Dynamic Voltage Scaling mechanisms is affected by technology scaling and system activity. We show that V dd scaling maintains its effectiveness...
Compiler-Directed Instruction Cache Leakage Optimization (2002)
W. Zhang, J. S. Hu, V. Degalahal, N. Vijaykrishnan, M. J. Irwin
Excessive power consumption is widely considered as a major impediment to designing future microprocessors. With the continued scaling down of threshold voltages, the power consumed due to leaky...
Energy savings through compression in embedded Java environments (2002)
G. Chen, N. Vijaykrishnan, M. J. Irwin, W. Wolf
Limited energy and memory resources are important constraints in the design of an embedded system. Compression is an useful and widely employed mechanism to reduce the memory requirements of the...
Adaptive Garbage Collection for Battery-Operated Environments (2002)
G. Chen, N. Vijaykrishnan, M. J. Irwin
Energy is an important constraint for battery-operated embedded Java environments. In this work, we show how the garbage collector (GC) can be tuned to reduce the energy consumption of Java...
Compiler-directed cache polymorphism (2002)
J. S. Hu, N. Vijaykrishnan, M. J. Irwin, H. Saputra, W. Zhang
Classical compiler optimizations assume a fixed cache architecture and modify the program to take best advantage of it. In some cases, this may not be the best strategy because each loop nest might...
Compiler-directed array interleaving for reducing energy in multi-bank memories (2002)
V. Delaluz, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam, I. Kolcu Y
With the increased use of embedded/portable devices such as smart cellular phones, pagers, PDAs, hand-held computers, and CD players, improving energy efficiency is becoming a critical issue. To...
Energy savings through compression in embedded Java environments (2002)
G. Chen, N. Vijaykrishnan, M. J. Irwin
Limited energy and memory resources are important constraints in the design of an embedded system. Compression is an useful and widely employed mechanism to reduce the memory requirements of the...
Eac: a compiler framework for high-level energy estimation and optimization (2002)
I. Kadayif, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam
This paper presents a novel Energy-Aware Compilation (EAC) framework that can estimate and optimize energy consumption of a given code taking as input the architectural and technological parameters,...
Eac: a compiler framework for high-level energy estimation and optimization (2002)
I. Kadayif, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam
This paper presents a novel Energy-Aware Compilation (EAC) framework that can estimate and optimize energy consumption of a given code taking as input the architectural and technological parameters,...
Compiler-directed array interleaving for reducing energy in multi-bank memories (2002)
V. Delaluz, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam, I. Kolcu Y
With the increased use of embedded/portable devices such as smart cellular phones, pagers, PDAs, hand-held computers, and CD players, improving energy efficiency is becoming a critical issue. To...
Scheduler-based DRAM energy management (2002)
V. Delaluz, A. Sivasubramaniam, N. Vijaykrishnan, M. J. Irwin
Previous work on DRAM power-mode management focused on hardware-based techniques and compiler-directed schemes to explicitly transition unused memory modules to low-power operating modes. While...
Energy Savings Through Compression in Embedded Java (2002)
Environments Chen Kandemir, G. Chen, N. Vijaykrishnan, M. J. Irwin
Limited energy and memory resources are important constraints in the design of an embedded system. Compression is an useful and widely employed mechanism to reduce the memory requirements of the...
Tuning Garbage Collection in an Embedded Java Environment (2002)
G. Chen, R. Shetty, M. Kandemir, N. Vijaykrishnan, M. J. Irwin, M. Wolczko
Java is being widely adopted as one of the software platforms for the seamless integration of diverse computing devices. Over the last year, there has been great momentum in adopting Java technology...
R. Pain, S. Fabbro, M. Sullivan, R. S. Ellis, G. Aldering, P. Astier, ...
We present a measurement of the rate of distant Type Ia supernovae derived using 4 large subsets of data from the Supernova Cosmology Project. Within this fiducial sample, which surveyed about 12...
Adaptive Garbage Collection for Battery-Operated Environments (2002)
Chen Kandemir Vijaykrishnan, G. Chen, N. Vijaykrishnan, M. J. Irwin
Energy is an important constraint for battery-operated embedded Java environments. In this work, we show how the garbage collector (GC) can be tuned to reduce the energy consumption of Java...
Leakage energy management in cache hierarchies (2002)
L. Li, I. Kadayif, Y-f. Tsai, N. Vijaykrishnan, M. J. Irwin, A. Sivasubramaniam
Energy management is important for a spectrum of systems ranging from high-performance architectures to lowend mobile and embedded devices. With the increasing number of transistors, smaller feature...
Hardware and Software Techniques for Controlling DRAM Power Modes (2001)
V. Delaluz, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin
The anticipated explosive growth of pervasive and mobile computing devices that are typically constrained by energy has brought hardware and software techniques for energy conservation into the...
Use of local memory for efficient java execution (2001)
S. Tomar, S. Kim, N. Vijaykrishnan, M. J. Irwin
Java has become a popular choice for implementing various applications that run on mobile and hand-held devices. Optimizing the energy consumption in mobile environments is of critical importance to...
Exploiting VLIW schedule slacks for dynamic and leakage energy reduction (2001)
W. Zhang, N. Vijaykrishnan, M. J. Irwin, D. Duarte, Y-f. Tsai
The mobile computing device market is projected to grow to 16.8 million units in 2004, representing an average annual growth rate of 28 % over the five year forecast period [5]. This brings the...
Energy behavior of Java applications from the memory perspective (2001)
N. Vijaykrishnan, S. Kim, S. Tomar, A. Sivasubramaniam, M. J. Irwin
Permission is granted for noncommercial reproduction of the work for educational or research purposes.
Energy-Efficient Instruction Cache using Page-Based Placement (2001)
S. Kim, N. Vijaykrishnan, M. J. Irwin
Energy consumption is a crucial factor in designing batteryoperated embedded and mobile systems. The memory system is a major contributor to the system energy in such environments. In order to...
Exploiting VLIW schedule slacks for dynamic and leakage energy reduction (2001)
W. Zhang, N. Vijayktishnan, M. J. Irwin, D. Duarte, Y-f. Tsai
The mobile computing device market is projected to grow to 16.8 million units in 2004, representing an average annual growth rate of 28 % over the five year forecast period [5]. This brings the...
Dynamic Management of Scratch-Pad Memory Space (2001)
J. Ramanujam, M. J. Irwin, N. Vijaykrishnan, I. Kadayif, A. Parikh
Optimizations aimed at improving the efficiency of on-chip memories are extremely important. We propose a compiler-controlled dynamic on-chip scratch-pad memory (SPM) management framework that uses...
Energy behavior of Java applications from the memory perspective (2001)
N. Vijaykrishnan, S. Kim, S. Tomar, A. Sivasubramaniam, M. J. Irwin
With the anticipated dramatic growth of computing devices for mobile and embedded environments, energy conscious hardware and software design has taken center-stage together with performance. At the...
DRAM Energy Management Using Software and Hardware Directed (2001)
Power Mode Control, V. Delaluz, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin
While there have been several studies and proposals for energy conservation for CPUs and peripherals, energy optimization techniques for selective operating mode control of DRAMs have not been fully...
Evidence for Two Superconducting Gaps in MgB2 (2001)
Chen, X. K., Franck, J. P., Irwin, M. J., Konstantinovic, M. J., Lawrie, D. D.
Investigating Memory System Energy Behavior Using Software and Hardware Optimizations (2001)
G. Esakkimuthu, H. S. Kim, M. Kandemir, N. Vijaykrishnan, M. J. Irwin
Memory system usually consumes a significant amount of energy in many battery-operated devices. In this paper, we provide a quantitative comparison and evaluation of the interaction of two hardware...
Energy-driven integrated hardware-software optimizations using SimplePower (2000)
N. Vijaykrishnan, M. J. Irwin, H. S. Kim, W. Ye
With the emergence of a plethora of embedded and portable applications, energy dissipation has joined throughput, area, and accuracy/precision as a major design constraint. Thus, designers must be...
Energy-driven integrated hardware-software optimizations using SimplePower (2000)
N. Vijaykrishnan, M. J. Irwin, H. S. Kim, W. Ye
With the emergence of a plethora of embedded and portable applications, energy dissipation has joined throughput, area, and accuracy/precision as a major design constraint. Thus, designers must be...
Influence of compiler optimizations on system power (2000)
N. Vijaykrishnan, M. J. Irwin, W. Ye
High-level compiler optimizations have been widely used to achieve speedups on array-based codes. Such optimizations are becoming increasingly important in embedded signal processing and multimedia...
The design and use of SimplePower: A cycle-accurate energy estimation tool (2000)
W. Ye, N. Vijaykrishnan, M. J. Irwin
In this paper, we present the design and use of a comprehensive framework, SimplePower, for evaluating the effect of high-level algorithmic, architectural, and compilation tradeoffs on energy. An...
The design and use of SimplePower: A cycle-accurate energy estimation tool (2000)
W. Ye, N. Vijaykrishnan, M. J. Irwin
In this paper, we presen t the design and use of a comprehensiv e framework, SimplePower, for ev aluating the e ect of high-level algorithmic, architectural, and compilation tradeo s on energy. An...
Memory energy management using software and hardware directed power mode control (2000)
V. Delaluz, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin
The anticipated explosive growth of pervasive and mobile computing devices that are typically constrained by energy has brought hardware and software techniques for energy conservation into the...
An energy estimation framework with integrated hardware-software optimizations (2000)
N. Vijaykrishnan, M. J. Irwin, H. Kim, W. Ye
With the emergence of a plethora of embedded and portable applications, energy dissipation has joined throughput, VLSI layout area, and accuracy/precision as a major design constraint. Thus,...
Multiple access caches: Energy implications (2000)
H. S. Kim, N. Vijaykrishnan, M. Kandemir, M. J. Irwin
In this paper, we model and evaluate the energy consumption of three different multiple access cache architectures that target the reduction of access latencies of associative caches. Further, we...
Effect of Compiler Optimizations on Memory Energy (2000)
H. S. Kim, M. J. Irwin, N. Vijaykrishnan
Abstract- Energy optimization has become an important issue in hardware and software design. In particular, optimizing the energy consumed by the memory system has been found to be very important....
The design and use of SimplePower: A cycle-accurate energy estimation tool (2000)
W. Ye, N. Vijaykrishnan, M. J. Irwin
In this paper, we present the design and use of a comprehensive framework, SimplePower, forevaluating the e ect of high-level algorithmic, architectural, and compilation tradeo s on energy. An...
Energy-driven integrated hardware-software optimizations using SimplePower (2000)
N. Vijaykrishnan, M. J. Irwin, H. S. Kim, W. Ye
With the emergence of a plethora of embedded and portable applications, energy dissipation has joined throughput, area, and accuracy/precision as a major design constraint. Thus, designers must be...
Memory energy management using software and hardware directed power mode control (2000)
V. Delaluz, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin
The anticipated explosive growth of pervasive and mobile computing devices that are typically constrained by energy has brought hardware and software techniques for energy conservation into the...
Effect of Compiler Optimizations on Memory Energy (2000)
H. S. Kim, M. J. Irwin, N. Vijaykrishnan
Abstract- Energy optimization has become an important issue in hardware and software design. In particular, optimizing the energy consumed by the memory system has been found to be very important....
Energy-driven integrated hardware-software optimizations using SimplePower (2000)
N. Vijaykrishnan, M. J. Irwin, H. S. Kim, W. Ye
With the emergence of a plethora of embedded and portable applications, energY dissipation has joined throughput, area, and accuracy/precision as a major design constraint. Thus, designers must be...
Influence of compiler optimizations on system power (2000)
N. Vijaykrishnan, M. J. Irwin, W. Ye
High-level compiler optimizations ha ve been widely used to ac hiev e speedups on array-based codes. Suc h optimizations are becoming increasingly important inembedded signal processing and...
Memory energy management using software and hardware directed power mode control (2000)
V. Delaluz, N. Vijaykrishnan, A. Sivasubramaniam, M. J. Irwin
The anticipated explosive growth of pervasive and mobile computing devices that are typically constrained by energy has brought hardware and software techniques for energy conservation into the...
Energy-driven integrated hardware-software optimizations using SimplePower (2000)
N. Vijaykrishnan, M. J. Irwin, H. S. Kim, W. Ye
With the emergence of a plethora of embedded and portable applications, energy dissipation has joined throughput, area, and accuracy/precision as a major design constraint. Thus, designers must be...
Implications For The Hubble Constant from the First Seven Supernovae at z >= 0.35 (1997)
Gabi, S., Goldhaber, G., Groom, D. E., Hook, I. M., Kim, M. Y., ...
The Supernova Cosmology Project has discovered over twenty-eight supernovae (SNe) at 0.35
Perlmutter, S., Gabi, S., Goldhaber, G., Groom, D. E., Hook, I. M., Kim, A. G., ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
E. J. Swankoski, R. R. Brooks, V. Narayanan, M. J. Irwin
Cryptographic algorithms are at the heart of secure systems worldwide, providing encryption for millions of sensitive financial, government, and private transactions daily. Reconfigurable computing...
Dosser, L. R., Gilmore, D. A., Pallix, J. B., Irwin, M. J., Atkinson, G. H.
1. ``Time-Resolved Raman Spectroscopy'' in Advances in Infrared and Raman Spectroscopy, R.J.H. Clark and R.E. Hester, ed., Heyden, London, in press. 2. G.H. Atkinson and L.R. Dosser, J. Chem. Phys....
Effect of Power Optimizations on Soft Error Rate (1970)
Vijay Degalahal, R. Ramanarayanan, Narayanan Vijaykrishnan, Y. Xie, M. J. Irwin
Due to technology scaling, devices are getting smaller, faster and operating at lower voltages. The reduced nodal capacitances and supply voltages coupled with more dense and larger chips are...