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Displaying Results 1 - 25 of 2052 on page 1 of 83
Marked
Mark
The Effect of Principal Component Analysis on Machine Learning Accuracy with High Dimensional Spectral Data
(2005)
Ryder, Alan G.; O Connell, Marie-Louise; Madden, Michael G.; Howley, Tom
The Effect of Principal Component Analysis on Machine Learning Accuracy with High Dimensional Spectral Data
(2005)
Ryder, Alan G.; O Connell, Marie-Louise; Madden, Michael G.; Howley, Tom
Abstract:
The classi¿cation of high dimensional data, such as images, gene-expression data and spectral data, poses an interesting challenge to machine learning, as the presence of high numbers of redundant or highly correlated attributes can seriously degrade classification accuracy. This paper investigates the use of Principal Component Analysis (PCA) to reduce high dimensional data and to improve the predictive performance of some well known machine learning methods. Experiments are carried out on a high dimensional spectral dataset, in which the task is to identify a target material within a mixture. These experiments employ the NIPALS (Non-Linear Iterative Partial Least Squares) PCA method, a method that has been used in the field of chemometrics for spectral classification, and is a more efficient alternative than the widely used eigenvector decomposition approach. The experiments show that the use of this PCA method can improve the performance of machine learning in the classification ...
http://hdl.handle.net/10379/194
Marked
Mark
A new MAC scheme for very high-speed WLANs
(2006)
Li, Tianji; Ni, Qiang; Leith , Douglas; Malone, David; Xiao, Yang; Turletti, Thierry
A new MAC scheme for very high-speed WLANs
(2006)
Li, Tianji; Ni, Qiang; Leith , Douglas; Malone, David; Xiao, Yang; Turletti, Thierry
Abstract:
We consider the medium access control (MAC) layer for very high-speed Wireless LANs, which is designed to support rich multimedia applications such as high-definition television. In such networks, the physical (PHY) layer data rate is proposed to exceed 216Mbps. The legacy MAC layer, however, greatly restricts the performance improvement due to its overhead. It has been shown that MAC utilizes less than 20% of the transportation ability provided by the PHY layer. To mitigate this inefficiency, we propose an Aggregation with Fragment Retransmission (AFR) scheme, which supports transmissions of very large frames and partial retransmissions in the case of errors. Aggregation allows for increased performance despite per-transmission overhead while partial retransmission alleviates the risk of losing the entire frame. Extensive simulations show that AFR fundamentally outperforms the legacy MAC protocol. It is particularly effctive for applications with high data rates and large packet si...
http://eprints.nuim.ie/1499/
Marked
Mark
Design Of High Frequency Digital Phase Locked Loops
(2006)
Daniels, Brian; Farrell, Ronan
Design Of High Frequency Digital Phase Locked Loops
(2006)
Daniels, Brian; Farrell, Ronan
Abstract:
This paper considers the stability of high order Charge Pump Phase Lock Loop (CP-PLL), proposing a novel means of identifying stable regions for such systems. Traditional design techniques are inefficient for high frequency, high order CPPLL systems. This paper proposes an accurate and efficient means of identifying stable regions for 2nd and 3rd order high frequency (> 1GHz) CP-PLL. Using exact non-linear CP-PLL responses it is shown that the proposed stability technique is a significant improvement over existing linear methods.
http://eprints.nuim.ie/601/
Marked
Mark
Direct and Indirect Classification of High-Frequency LNA Performance using Machine Learning Techniques
(2007)
Hung, Peter; McLoone, S.; Sanchez, Magdalena; Farrell, Ronan; Zhang, Guoyan
Direct and Indirect Classification of High-Frequency LNA Performance using Machine Learning Techniques
(2007)
Hung, Peter; McLoone, S.; Sanchez, Magdalena; Farrell, Ronan; Zhang, Guoyan
Abstract:
The task of determining low noise amplifier (LNA) high-frequency performance in functional testing is as challenging as designing the circuit itself due to the difficulties associated with bringing high frequency signals off-chip. One possible strategy for circumventing these difficulties is to attempt to predict the high frequency performance measures using measurements taken at lower, more accessible, frequencies. This paper investigates the effectiveness of machine learning based classification techniques at predicting the gain of the amplifier, a key performance parameter, using such an approach. An indirect artificial neural network (ANN) and direct support vector machine (SVM) classification strategy are considered. Simulations show promising results with both methods, with SVMs outperforming ANNs for the more demanding classification scenarios.
http://eprints.nuim.ie/1338/
Marked
Mark
A New High Power Parallel Converter Scheme for Active Power Filters
(2004)
Basu, Malabika; Das, S. P.; Dubey, Gopal
A New High Power Parallel Converter Scheme for Active Power Filters
(2004)
Basu, Malabika; Das, S. P.; Dubey, Gopal
Abstract:
<p>A new topology for efficient utilisation of parallel converters as VAR compensators and active power filters (APF) for high power loads is proposed. Because of limited power handling capacity of individual devices, paralleling is the choice to increase rating of equipment, while keeping the THD of the current at the PCC within the agency specified standards. It has been reported in the literature that paralleling several converters, rather than switches, is more reliable in sharing of load. From this perspective, multilevel converters carry lot of weight, as their typical power circuit configuration limits the stress on individual devices to an appreciable extent. Also, they have the advantage of low switching frequency and full utilisation of switching devices, which is essential in high-power applications. These advantages have been utilised in parallel combination with a low-power high-frequency current-controlled APF, such that the higher order harmonics can be eliminat...
http://arrow.dit.ie/engscheleart2/1
Marked
Mark
High Performance Computing Instrumentation and Research Productivity in U.S. Universities
(2010)
GURDGIEV, CONSTANTIN
High Performance Computing Instrumentation and Research Productivity in U.S. Universities
(2010)
GURDGIEV, CONSTANTIN
Abstract:
This paper studies the relationship between investments in High-Performance Computing (HPC) instrumentation and research competitiveness. Measures of institutional HPC investment are computed from data that is readily available from the Top 500 list, a list that has been published twice a year since 1993 that lists the fastest 500 computers in the world at that time. Institutions that are studied include US doctoral-granting institutions that fall into the very high or high research rankings according to the Carnegie Foundation classifications and additional institutions that have had entries in the Top 500 list. Research competitiveness is derived from federal funding data, compilations of scholarly publications, and institutional rankings. Correlation and Two Stage Least Square regression is used to analyze the research-related returns to investment in HPC. Two models are examined and give results that are both economically and statistically significant. Appearance on the Top 500 ...
http://hdl.handle.net/2262/59246
Marked
Mark
The high frequency electrical properties of interconnects on a flexible polyimide substrate including the effects of humidity
(2011)
McGibney, Eoin; Barton, John; Floyd, Liam; Tassie, Paul; Barrett, John
The high frequency electrical properties of interconnects on a flexible polyimide substrate including the effects of humidity
(2011)
McGibney, Eoin; Barton, John; Floyd, Liam; Tassie, Paul; Barrett, John
Abstract:
Science Foundation Ireland (NAP-72); Science Foundation Ireland (CSET - Centre for Science, Engineering and Technology, Grant No. 07/CE/11147); Ireland’s EU Structural Funds Programme 2007–2013, co-funded by the Irish Government and the European Union, in the Fourth Cycle of the Programme for Research in Third Level Institutions “PRTLI-IV” as part of the M-Zones Research Programme
Accepted Version
Flexible circuit board materials can be used to advantage in radio frequency and high-speed digital systems but an obstacle to their use is the lack of availability of information on the electrical properties of materials to high frequencies and, in particular, the variation in dielectric constant and loss tangent as a function of frequency. This makes accurate electromagnetic simulation of high frequency flexible interconnects difficult. The variation of the electrical properties of these materials as a function of environmental parameters, such as humidity, is also unknown at hig...
http://hdl.handle.net/10468/422
Marked
Mark
Analysis and design of high order digital phase locked loops
(2008)
Daniels, Brian
Analysis and design of high order digital phase locked loops
(2008)
Daniels, Brian
Abstract:
The Phase Locked Loop (PLL) is an important component of many electronic devices; it can be employed as a frequency synthesizer, for clock data recovery, and as amplitude and frequency demodulators. It is an inherently nonlinear closed loop feedback system; the nonlinearity is due mainly to the fact that the feedback loop comparator exhibits quantization-like effects at its output. The consequence of this nonlinearity is a lack of understanding of the behaviour of the PLL loop, particularly the behaviour and stability of high order PLL systems. This thesis presents a new design technique for high order Digital PLL (DPLL)systems with a charge pump phase frequency detector component, offering an alternative to the common design practice which is to analyze the DPLL using a linearised model of the analogue PLL. The linear model can only be justified for low order DPLL systems that are close to lock. This is due to the fact that as the DPLL systems loop order and complexity increases th...
http://eprints.nuim.ie/1492/
Marked
Mark
Sharp Rejection Techniques in High Frequency Active-RC LPF for UWB Applications
(2008)
Tuan-Phan, Anh; Farrell, Ronan ; Gug-Lee, Sang
Sharp Rejection Techniques in High Frequency Active-RC LPF for UWB Applications
(2008)
Tuan-Phan, Anh; Farrell, Ronan ; Gug-Lee, Sang
Abstract:
This paper describes a sharp-rejection technique in designing active-RC LPF for MB-OFDM UWB applications. Sharp rejection is attributed to the combination of different AC characteristic of three Biquads in series. A simple operational amplifier (Op-amp) is adopted to ensure high frequency and high linear performance for the designed filter. The cutoff frequency is 264MHz, with 13dB rejection at 290MHz and about 50dB at twice bandwith. the LPF is designed in 0.13um IBM CMOS process with pass-band ripple of less that 1dB, IIP3 is 23dBm while cnsuming 8.4mA from 1.5V supply.
http://eprints.nuim.ie/1403/
Marked
Mark
An Efficient Parallel Structure for ΣΔ Modulators for use in High Speed Switching Power Amplifiers
(2007)
Farrell, Ronan
An Efficient Parallel Structure for ΣΔ Modulators for use in High Speed Switching Power Amplifiers
(2007)
Farrell, Ronan
Abstract:
Switching amplifiers using Sigma-delta modulators have proven to be highly efficient but require high switching speeds. Implementing complete digital systems at the switching speed has prevented their use in higher speed applications. In this paper we propose a methodology for the parallelisation of sigma-delta modulators allowing for the partition of the switching amplifier into a low-speed and high speed sections. This will enable switching amplifiers to be used effectively at higher frequencies, and specifically for wireless applications.
http://eprints.nuim.ie/1344/
Marked
Mark
High-tech Communities: Better Work or Just More Work?
(2002)
O Riain, Sean
High-tech Communities: Better Work or Just More Work?
(2002)
O Riain, Sean
Abstract:
High-tech workers are creating communities that offer them flexibility, creativity and independence at work. However, it remains to be seen whether such communities can overcome the problems of insecurity, long work hours and exclusion created by the fierce individualism of high-tech careers.
http://eprints.nuim.ie/593/
Marked
Mark
Aggregation with fragment retransmission for very high-speed WLANs
(2009)
Li, Tianji; Ni, Qiang; Malone, David; Leith , Douglas; Turletti, Thierry; Xiao, Yang
Aggregation with fragment retransmission for very high-speed WLANs
(2009)
Li, Tianji; Ni, Qiang; Malone, David; Leith , Douglas; Turletti, Thierry; Xiao, Yang
Abstract:
In upcoming very high-speed WLANs the physical layer (PHY) rate may reach 600 Mbps. To achieve high efficiency at the medium access control (MAC) layer, we identify fundamental properties that must be satisfied by any CSMA/CA based MAC layer and develop a novel scheme called Aggregation with Fragment Retransmission (AFR). In the AFR scheme, multiple packets are aggregated into and transmitted in a single large frame. If errors happen during the transmission, only the corrupted fragments of the large frame are retransmitted. An analytic model is developed to evaluate the throughput and delay performance of AFR over a noisy channel, and to compare AFR with competing schemes in the literature. Optimal frame and fragment sizes are calculated using this model. Transmission delays are minimised by using a zero-waiting mechanism where frames are transmitted immediately once the MAC wins a transmission opportunity. We prove that zero waiting can achieve maximum throughput. As a complement t...
http://eprints.nuim.ie/1202/
Marked
Mark
Efficient simulation of interconnects in high-speed circuits
(2003)
Dautbegovic, Emira; Condon, Marissa
Efficient simulation of interconnects in high-speed circuits
(2003)
Dautbegovic, Emira; Condon, Marissa
Abstract:
The paper presents an efficient approach for the simulation of interconnects in high-speed circuits based on measured data or simulated EM data. The approach involves forming an initial transmission-line model based on a resonant approach introduced by the authors and subsequently tuning this model to match the measured data. Following tuning, the model is converted to a state-space formulation. This then enables a standard model reduction routine such as the Lanczos process to be applied so as to gain further improvements from a computational efficiency viewpoint. The overall result is a highly efficient interconnect model based on measured data.
http://doras.dcu.ie/15443/
Marked
Mark
High resolution photoemission study of SiOx/Si(111) interface disruption following in situ HfO₂deposition
(2009)
McDonnell, Stephen; Brennan, Barry; Hughes, Greg
High resolution photoemission study of SiOx/Si(111) interface disruption following in situ HfO₂deposition
(2009)
McDonnell, Stephen; Brennan, Barry; Hughes, Greg
Abstract:
We report on an in situ high resolution core level photoemission study of the early stages of interface formation between an ultrathin SiOx layer ( ∼ 0.3 nm) grown on the atomically clean Si(111) surface and a HfO2 dielectric layer. Si 2p core level spectra acquired at 130 eV photon energy reveal evidence of a chemically shifted component on the lower binding energy side of the substrate peak which is attributed to interface defect states resulting from the incorporation of silicon atoms from the substrate into the interfacial oxide at room temperature. This evidence of Si/SiOx interface disruption would be expected to increase charge carrier scattering mechanisms in the silicon and contribute to the generally observed mobility degradation in high-k stacks with ultrathin silicon oxide interface layers.
http://doras.dcu.ie/15581/
Marked
Mark
High-throughput Automated System for Crystallizing Membrane Proteins in Lipidic Mesophases.
(2007)
CAFFREY, MARTIN
High-throughput Automated System for Crystallizing Membrane Proteins in Lipidic Mesophases.
(2007)
CAFFREY, MARTIN
Abstract:
A high-throughput robotic system has been developed to enable the automatic handling of nanoliter volumes of highly viscous biomaterials for crystallizing membrane proteins using lipidic mesophases. The in meso method introduced a few years ago has produced crystal structures of a number of important membrane proteins. The bottleneck to achieve high throughput automation of this, so-called in meso method, is the handling of nanoliter volumes of the highly viscous cubic phase as part of the crystallization process. The cubic phase sticks to everything that it has contact with and has a tendency to disable dispensing robotic tools. In this paper, we discuss the factors that influence the successful and automatic delivery of nanoliter volumes of the cubic phase. A creative cubic-phase-based coordinate measuring mechanism is presented for controlling the dispensing distance of the cubic phase which is critically important for the successful performance of the system. A mathematical mode...
http://hdl.handle.net/2262/50463
Marked
Mark
The Power of High Explosives in a Confined Space
(2004)
Clonan, Tom
The Power of High Explosives in a Confined Space
(2004)
Clonan, Tom
Abstract:
ANALYSIS: When terrorists bomb packed trains, the injuries are horrific, reports Tom Clonan The bombs that ripped through three Spanish commuter trains yesterday were especially lethal when detonated in such a confined space. The type of explosives used would appear to have been high-explosive devices of a type used previously by terrorist groups such as Eta and the Provisional IRA. Indeed, Spanish police foiled an attempt to place a 25kg high-explosive device on the regional San Sebastian-Madrid train as recently as December of last year. Such devices are simply assembled and consist of three main components. The bulk explosive charge in such devices is normally a plastic explosive such as Semtex, or a western military explosive such as C4 or P4. All such explosives are nitrogen-based and contain nitroglycerine or nitrocellulose.
http://arrow.dit.ie/aaschmedart/69
Marked
Mark
High Time Resolution Astrophysics in the Extremely Large Telescope Era : White Paper
(2010)
Shearer, Andrew
High Time Resolution Astrophysics in the Extremely Large Telescope Era : White Paper
(2010)
Shearer, Andrew
Abstract:
High Time Resolution Astrophysics (HTRA) concerns itself with observations on short scales normally defined as being lower than the conventional read-out time of a CCD. As such it is concerned with condensed objects such as neutron stars, black holes and white dwarfs, surfaces with extreme magnetic reconnection phenomena, as well as with planetary scale objects through transits and occultations. HTRA is the only way to make a major step forward in our understanding of several important astrophysical and physical processes; these include the extreme gravity conditions around neutron stars and stable orbits around stellar mass black holes. Transits, involving fast timing, can give vital information on the size of, and satellites around exoplanets. In the realm of fundamental physics very interesting applications lie in the regime of ultra-high time resolution, where quantum-physical phenomena, currently studied in laboratory physics, may be explored. HTRA science covers the full gamut...
http://hdl.handle.net/10379/1738
Marked
Mark
Discovery of Variability in the Very High Energy Gamma-Ray Emission of 1ES 1218+304 with VERITAS
(2010)
Lang, Mark; Gillanders, Gary
Discovery of Variability in the Very High Energy Gamma-Ray Emission of 1ES 1218+304 with VERITAS
(2010)
Lang, Mark; Gillanders, Gary
Abstract:
We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level of ~6% of the Crab Nebula flux, the new VERITAS data reveal a prominent flare reaching ~20% of the Crab. While very high energy (VHE) flares are quite common in many nearby blazars, the case of 1ES 1218+304 (redshift z = 0.182) is particularly interesting since it belongs to a group of blazars that exhibit unusually hard VHE spectra considering their redshifts. When correcting the measured spectra for absorption by the extragalactic background light, 1ES 1218+304 and a number of other blazars are found to have differential photon indices less than 1.5. The difficulty in modeling these hard spectral energy distributions in blazar jets has led to a range of theoretical gamma-ray emission scenarios, one of which is strongly constrained by these new VERITAS observati...
http://hdl.handle.net/10379/1710
Marked
Mark
Radio Imaging of the Very-High-Energy Gamma-Ray Emission Region in the Central Engine of a Radio Galaxy
(2009)
Lang, Mark
Radio Imaging of the Very-High-Energy Gamma-Ray Emission Region in the Central Engine of a Radio Galaxy
(2009)
Lang, Mark
Abstract:
The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10^12 electron Volts (eV) and are bright sources of very-high-energy (VHE) gamma-ray emission, it is not yet known where the VHE emission originates. Here we report on radio and VHE observations of the radio galaxy M87, revealing a period of extremely strong VHE gamma-ray flares accompanied by a strong increase of the radio flux from its nucleus. These results imply that charged particles are accelerated to very high energies in the immediate vicinity of the black hole.
http://hdl.handle.net/10379/1770
Marked
Mark
High performance work systems, workforce productivity, and innovation: a comparison of MNCs and indigenous firms
(2008)
Guthrie, James P.; Liu, Wenchuan; Flood, Patrick C.; MacCurtain, Sarah
High performance work systems, workforce productivity, and innovation: a comparison of MNCs and indigenous firms
(2008)
Guthrie, James P.; Liu, Wenchuan; Flood, Patrick C.; MacCurtain, Sarah
Abstract:
Previous research has reported conflicting results on whether or not foreign-owned firms diverge from indigenous firms with respect to their human resource policies and practices. Set in the dynamic, globalized economy of the Republic of Ireland, this study examines the relative use of high performance work systems (HPWS) by foreign-owned versus Irish-owned firms. We also investigate the implications of HPWS use for organizational effectiveness. Results suggest substantial differences associated with country of ownership. Relative to Irish-owned firms, foreign-owned firms report higher HPWS utilization and higher rates of workforce productivity and innovation. Results suggest that the relationship between country of ownership and organizational effectiveness is mediated by the use of HPWS.
http://doras.dcu.ie/2421/
Marked
Mark
Partnership, high performance work systems and organizational effectiveness
(2008)
Flood, Patrick C.; Guthrie, Jim; Liu, Wenchuan; O'Regan, Cathal; Armstrong, Claire...
Partnership, high performance work systems and organizational effectiveness
(2008)
Flood, Patrick C.; Guthrie, Jim; Liu, Wenchuan; O'Regan, Cathal; Armstrong, Claire; MacCurtain, Sarah; Mkamwa, Thaddeus
Abstract:
Using data gathered from 132 organizations operating in Ireland, we examined the impact of high performance work systems (HPWS) and partnership on firm-level performance. Our results reveal that HPWS and partnership practices are positively associated with labour productivity, workplace innovation and negatively associated with voluntary turnover. More specifically, both HPWS and partnership are positively associated with labour productivity and employee retention, and the positive relationship between partnership and workplace innovation is mediated by HPWS.
http://doras.dcu.ie/2424/
Marked
Mark
Causal and stable reduced-order model for linear high-frequency systems
(2008)
Condon, Marissa; Grahovski, Georgi G.
Causal and stable reduced-order model for linear high-frequency systems
(2008)
Condon, Marissa; Grahovski, Georgi G.
Abstract:
With the ever-growing complexity of high-frequency systems in the electronic industry, formation of reduced-order models of these systems is paramount. In this reported work, two different techniques are combined to generate a stable and causal representation of the system. In particular, balanced truncation is combined with a Fourier series expansion approach. The efficacy of the proposed combined method is shown with an example.
http://doras.dcu.ie/4506/
Marked
Mark
A Practical Class S Power Amplifier for High Frequency Transmitters
(2008)
Dooley, John; Farrell, Ronan
A Practical Class S Power Amplifier for High Frequency Transmitters
(2008)
Dooley, John; Farrell, Ronan
Abstract:
Digital signal processing (DSP) techniques are being incorporated in the design of modern power amplifiers (PA) and as the speed of DSP advances it is envisioned that DSP will develop to a point where algorithms will provide signals at RF particularly for switching amplifiers. The digital transmitter has many potential benefits such as the absence of aging or tuning problems, reconfigurability, programmability as well as ease of integration and testing. In this paper a new class S RF power amplifier architecture is proposed for use in high frequency transmitters and is not restricted by the requirement for the square wave modulator to have a sampling rate of 4 times the carrier frequency.
http://eprints.nuim.ie/1409/
Marked
Mark
Using High Pass Sigma-Delta Modulation for Class-S Power Amplifiers
(2007)
Ralph, Stephen; Farrell, Ronan
Using High Pass Sigma-Delta Modulation for Class-S Power Amplifiers
(2007)
Ralph, Stephen; Farrell, Ronan
Abstract:
Switching power amplifiers offer the potential for superior efficiencies if used at radio frequencies. However many existing bandpass architectures require a switching frequency four times that of the signal, making implementation difficult. In this paper we propose to use a high-pass sigma-delta modulator to reduce the switching rate to only twice of the signal. We will present a solution to the problem of the reflected image and demonstrate it’s viability for use in mobile telephony.
http://eprints.nuim.ie/1342/
Marked
Mark
A Statistal Study of Large Field-Aligned Flows of Thermal Ions at High-Latitudes
(1990)
Keating, John; Mulligan, F.J.; Doyle, D.B.; Winser, K.J.; Lockwood, M.
A Statistal Study of Large Field-Aligned Flows of Thermal Ions at High-Latitudes
(1990)
Keating, John; Mulligan, F.J.; Doyle, D.B.; Winser, K.J.; Lockwood, M.
Abstract:
A number of case studies of large, transient, field-aligned ion flows in the topside ionosphere at high-latitudes have been reported, showing that these events occur during periods of frictional heating and/or intense particle precipitation. This study examines the frequency of occurance of such events for the altitude range 200-500km, based on 3 years of incoherent scatter data. Correlations of the upgoing ion flux at 400km with ion and electron temperatures at lower altitudes are presented, together with a discussion of possible mechanisms for the production of such large flows. The influence of low-altitude electron precipitation on the production of these events is also considered.
http://eprints.nuim.ie/819/
Displaying Results 1 - 25 of 2052 on page 1 of 83
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Item Type
Book (6)
Book chapter (25)
Conference item (504)
Contribution to newspaper/m... (1)
Doctoral thesis (143)
Journal article (1060)
Master thesis (research) (37)
Master thesis (taught) (38)
Report (47)
Review (3)
Working paper (109)
Other (79)
Institution
Dublin City University (356)
NUI Galway (153)
NUI Maynooth (218)
Trinity College Dublin (670)
University College Cork (44)
University College Dublin (226)
University of Limerick (86)
Dublin Institute of Technology (299)
Peer Review Status
Peer reviewed (1576)
Non peer reviewed (398)
Unknown (78)
Year
2012 (65)
2011 (263)
2010 (322)
2009 (267)
2008 (192)
2007 (181)
2006 (162)
2005 (130)
2004 (97)
2003 (72)
2002 (53)
2001 (33)
2000 (32)
1999 (30)
1998 (14)
1997 (19)
1996 (9)
1995 (19)
1994 (11)
1993 (11)
1992 (6)
1991 (4)
1990 (4)
1989 (6)
1988 (3)
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