Search results for "offsets"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
106	J. Rafael Sendra, Juana Sendra	Rationality Analysis and Direct Parametrization of Generalized Offsets to Quadrics.	Appl. Algebra Eng. Commun. Comput.	2000	DBLP DOI BibTeX RDF	Offset surfaces, Parametrization, Computer-aided geometric design, Rationality, Quadrics
56	Yu Fu 0003, Chintha Tellambura, Witold A. Krzymien	Limited-Feedback Precoding for Closed-Loop Multiuser MIMO OFDM Systems with Frequency Offsets.	IEEE Trans. Wirel. Commun.	2008	DBLP DOI BibTeX RDF
56	Wei Dong, Jiandong Li 0001, Zhuo Lu	Parameter Estimation for MIMO Systems with Multiple Frequency Offsets.	AINA	2008	DBLP DOI BibTeX RDF
56	Qiang Yu, Sangarapillai Lambotharan	Iterative (Turbo) Estimation and Detection Techniques for Frequency Selective Channels with Multiple Frequency Offsets in MIMO System.	VTC Spring	2007	DBLP DOI BibTeX RDF
56	Linjing Zhao, Jiandong Li 0001, Zhuo Lu, Jiyong Pang	Carrier-Frequency Offsets Estimation Based on ML and ESPRIT Method for OFDMA Uplink.	AINA (2)	2006	DBLP DOI BibTeX RDF
54	Kristian Sandström, Christer Norström	Managing Complex Temporal Requirements in Real-Time Control Systems.	ECBS	2002	DBLP DOI BibTeX RDF	assigning priorities, assigning offsets, relative timing constraints, scheduling, Real-time systems, control systems
50	Martin Lukac, Paul Davis, Robert Clayton, Deborah Estrin	Recovering temporal integrity with Data Driven Time Synchronization.	IPSN	2009	DBLP DOI BibTeX RDF
50	Wei Dong, Jiandong Li 0001, Zhuo Lu	Joint Frequency Offset and Channel Estimation for MIMO Systems Based on Particle Swarm Optimization.	VTC Spring	2008	DBLP DOI BibTeX RDF
50	Kuo-Hsiung Wu, Wen-Hsien Fang, Jiunn-Tsair Chen	Joint DOA-Frequency Offset Estimation and Data Detection in Uplink MIMO-OFDM Networks with SDMA Techniques.	VTC Spring	2006	DBLP DOI BibTeX RDF
49	Jukka Mäki-Turja, Mikael Nolin	Efficient implementation of tight response-times for tasks with offsets.	Real Time Syst.	2008	DBLP DOI BibTeX RDF	Tasks with offsets, Fixed priority scheduling, Response-time analysis
49	João Batista S. de Oliveira, Luiz Henrique de Figueiredo	Robust Approximation of Offsets and Bisectors of Plane Curves.	SIBGRAPI	2000	DBLP DOI BibTeX RDF	robust approximation, global optimization problems, optimisation, interval arithmetic, parametric curves, offsets, bisectors, plane curves
46	Zheng Li, Xiang-Gen Xia 0001	An Alamouti coded OFDM transmission for cooperative systems robust to both timing errors and frequency offsets.	IEEE Trans. Wirel. Commun.	2008	DBLP DOI BibTeX RDF
46	Hlaing Minn, Yinghui Li, Naofal Al-Dhahir	PAR-Constrained Training Signal Designs for MIMO OFDM Channel Estimation in the Presence of Frequency Offsets.	IEEE Trans. Wirel. Commun.	2008	DBLP DOI BibTeX RDF
46	Natalia Y. Ermolova, Olav Tirkkonen	OFDM interference analysis in nonlinear time-varying radio channels with frequency offsets.	PIMRC	2008	DBLP DOI BibTeX RDF
46	Rui Yang 0006, Zhenhua Qu, Jiwu Huang	Detecting digital audio forgeries by checking frame offsets.	MM&Sec	2008	DBLP DOI BibTeX RDF	digital audio forensics, multimedia authentication, mp3
46	Zheng Li, Xiang-Gen Xia 0001	An Alamouti Coded Cooperative Transmission Robust to Both Timing Errors and Frequency Offsets.	MobiQuitous	2007	DBLP DOI BibTeX RDF
46	Zheng Li, Wenshu Zhang, Guangxi Zhu	On Detection of Distributed STBC-OFDM system with Multiple Carrier Frequency Offsets.	VTC Spring	2006	DBLP DOI BibTeX RDF
46	Karim Traore, Emmanuel Grolleau, Ahmed Rahni, Michaël Richard	Response-Time Analysis of tasks with offsets.	ETFA	2006	DBLP DOI BibTeX RDF
46	Jukka Mäki-Turja, Mikael Nolin	Fast and Tight Response-Times for Tasks with Offsets.	ECRTS	2005	DBLP DOI BibTeX RDF
43	Jian Du, Xia Lei, Shaoqian Li	A Novel Frequency Offset Estimation Method for Distributed MIMO Systems with Large Estimation Range.	RSKT	2009	DBLP DOI BibTeX RDF	Noncooperative game (NG) optimization, frequent offsets, multi-input multi-output (MIMO), maximum likelihood
40	Satya Prakash Ponnaluri, Stephen G. Wilson	A Low-Complexity Receiver for Cooperative Simultaneous Relaying.	ICC	2008	DBLP DOI BibTeX RDF
39	Wei Lü	Rational Parameterization of Quadrics and their Offsets.	Computing	1996	DBLP DOI BibTeX RDF	triangular and quadrangular patches, rational Bézier patches, rational offsets, rational parameterization, Computational geometry, quadrics
36	Huiming Wang 0001, Xiang-Gen Xia 0001, Qinye Yin 0001	Computationally efficient equalization for asynchronous cooperative communications with multiple frequency offsets.	IEEE Trans. Wirel. Commun.	2009	DBLP DOI BibTeX RDF
36	Ananthanarayanan Chockalingam, K. Raghunath	SIR analysis and interference cancellation in uplink OFDMA with large carrier frequency/timing offsets.	IEEE Trans. Wirel. Commun.	2009	DBLP DOI BibTeX RDF
36	Ping-Hung Chiang, Ding-Bing Lin, Hsueh-Jyh Li, Gordon L. Stüber	Joint Estimation of Carrier-Frequency and Sampling-Frequency Offsets for SC-FDE Systems on Multipath Fading Channels.	IEEE Trans. Commun.	2008	DBLP DOI BibTeX RDF
36	Hyeong In Choi, Sung Woo Choi, Chang Yong Han, Tae-wan Kim 0001, Song-Hwa Kwon, Hwan Pyo Moon, Kyeong Hah Roh, Nam-Sook Wee	Two-dimensional offsets and medial axis transform.	Adv. Comput. Math.	2008	DBLP DOI BibTeX RDF	Mathematics Subject Classifications (2000) 51N25 (Analytic geometry with other transformation groups)
36	Serdar Sezginer, Pascal Bianchi, Walid Hachem	Asymptotic Cramér-Rao Bounds and Training Design for Uplink MIMO-OFDMA Systems With Frequency Offsets.	IEEE Trans. Signal Process.	2007	DBLP DOI BibTeX RDF
36	Daiming Qu, Guangxi Zhu, Tao Jiang 0002	Training Sequence Design and Parameter Estimation of MIMO Channels with Carrier Frequency Offsets.	IEEE Trans. Wirel. Commun.	2006	DBLP DOI BibTeX RDF
36	Mu-Huo Cheng, Chi-Chan Chou	Maximum-likelihood estimation of frequency and time offsets in OFDM systems with multiple sets of identical data.	IEEE Trans. Signal Process.	2006	DBLP DOI BibTeX RDF
36	Rodolfo Pellizzoni, Giuseppe Lipari	Feasibility Analysis of Real-Time Periodic Tasks with Offsets.	Real Time Syst.	2005	DBLP DOI BibTeX RDF	scheduling, real-time systems
36	Tamer Kadous, Akbar M. Sayeed	An integrated framework for MC-CDMA reception in the presence of frequency offsets, phase noise, and fast fading.	IEEE Trans. Wirel. Commun.	2004	DBLP DOI BibTeX RDF
36	Jukka Mäki-Turja, Mikael Nolin	Efficient Response-Time Analysis for Tasks with Offsets.	IEEE Real-Time and Embedded Technology and Applications Symposium	2004	DBLP DOI BibTeX RDF
36	Jorge Real, Alfons Crespo	Offsets for Scheduling Mode Changes.	ECRTS	2001	DBLP DOI BibTeX RDF
36	Thomas O'Donnell, Terrance E. Boult, Alok Gupta	Global Models with Parametric Offsets as Applied to Cardiac Motion Recovery.	CVPR	1996	DBLP DOI BibTeX RDF	Tagged-MR, SpaMM, Cardiac Motion, Constant Volume, Deformable Models, Geodesic, Hybrid Models
36	Abdul A. Malik, Robert K. Brayton, A. Richard Newton, Alberto L. Sangiovanni-Vincentelli	Reduced offsets for minimization of binary-valued functions.	IEEE Trans. Comput. Aided Des. Integr. Circuits Syst.	1991	DBLP DOI BibTeX RDF
36	Abdul A. Malik, Robert K. Brayton, A. Richard Newton, Alberto L. Sangiovanni-Vincentelli	Reduced Offsets for Two-Level Multi-Valued Logic Minimization.	DAC	1990	DBLP DOI BibTeX RDF
33	Bohumír Bastl, Jirí Kosinka, Miroslav Lávicka	A symbolic-numerical envelope algorithm using quadratic MOS patches.	Symposium on Solid and Physical Modeling	2009	DBLP DOI BibTeX RDF	Bézier clipping, MOS surfaces, envelope formula, inner offsets, quadratic patches, trimming
33	Martin Isenburg, Jack Snoeyink	Early-split coding of triangle mesh connectivity.	Graphics Interface	2006	DBLP BibTeX RDF	TG coder, connectivity compression, cut-border machine, degree coding, edgebreaker, label coding, split offsets
33	Jorge Real, Alfons Crespo	Mode Change Protocols for Real-Time Systems: A Survey and a New Proposal.	Real Time Syst.	2004	DBLP DOI BibTeX RDF	mode change protocols, real-time scheduling, resource sharing, multimoded systems, offsets
32	Yi Cao 0004, Weifeng Su, Stella N. Batalama	A Novel Receiver Design and Maximum-Likelihood Detection for Distributed MIMO Systems in Presence of Distributed Frequency Offsets and Timing Offsets.	IEEE Trans. Signal Process.	2018	DBLP DOI BibTeX RDF
30	Zhen He, Xiaoyang Sean Wang, Byung Suk Lee 0001, Alan C. H. Ling	Mining partial periodic correlations in time series.	Knowl. Inf. Syst.	2008	DBLP DOI BibTeX RDF	Time series mining, Principal component analysis, Correlations, Periodic patterns
30	Stefano Buzzi, Marco Lops, Stefania Sardellitti	Further results on Cramér-Rao bounds for parameter estimation in long-code DS/CDMA systems.	IEEE Trans. Signal Process.	2005	DBLP DOI BibTeX RDF
30	Ming Luo, Qinye Yin 0001, Le Ding, Yiwen Zhang	Iterative Decoding and Carrier Frequency Offset Estimation for a Space-Time Block Code System.	ICN (2)	2005	DBLP DOI BibTeX RDF
30	Philomena C. Brady, Paul E. Hasler	Offset compensation in flash ADCs using floating-gate circuits.	ISCAS (6)	2005	DBLP DOI BibTeX RDF
30	Bardia Pishdad, Gordon W. Roberts	A 10-bit 1 MS/s 3-step ADC with bitstream-based sub-DAC and sub-ADC calibration.	ISCAS (1)	2002	DBLP DOI BibTeX RDF
26	Sajid Ahmed, Li Zhang 0011	Low complexity iterative detection for OFDMA uplink with frequency offsets.	IEEE Trans. Wirel. Commun.	2009	DBLP DOI BibTeX RDF
26	Huiming Wang 0001, Xiang-Gen Xia 0001, Qinye Yin 0001	Distributed space-frequency codes for cooperative communication systems with multiple carrier frequency offsets.	IEEE Trans. Wirel. Commun.	2009	DBLP DOI BibTeX RDF
26	Enrica Nicolini, Christophe Ringeissen, Michaël Rusinowitch	Satisfiability Procedures for Combination of Theories Sharing Integer Offsets.	TACAS	2009	DBLP DOI BibTeX RDF
26	M. Jansen	Stable Edge-Adaptive Multiscale Decompositions Using Updated Normal Offsets.	IEEE Trans. Signal Process.	2008	DBLP DOI BibTeX RDF
26	Chengshan Xiao, Yahong Rosa Zheng	Channel Equalization and Symbol Detection for Single Carrier Broadband MIMO Systems with Multiple Carrier Frequency Offsets.	ICC	2008	DBLP DOI BibTeX RDF
26	Shamaiah Manohar, Dheeraj Sreedhar, Vibhor Tikiya, Ananthanarayanan Chockalingam	Cancellation of Multiuser Interference Due to Carrier Frequency Offsets in Uplink OFDMA.	IEEE Trans. Wirel. Commun.	2007	DBLP DOI BibTeX RDF
26	Kirtan N. Modi, Satya Prakash Ponnaluri, Stephen G. Wilson, Maïté Brandt-Pearce	ALOHA for Wireless Sensor Networks with Random Frequency Offsets.	CISS	2007	DBLP DOI BibTeX RDF
26	Huahao Shou, Jie Shen 0009, David Yoon	Robust Plotting of Polar Algebraic Curves, Space Algebraic Curves, and Offsets of Planar Algebraic Curves.	Reliab. Comput.	2006	DBLP DOI BibTeX RDF
26	Wei Wang, Tony Ottosson, Tommy Svensson	Performance of an Adaptive Multiuser OFDM Uplink with Carrier Frequency Offsets.	VTC Spring	2006	DBLP DOI BibTeX RDF
26	Nak-Seon Seong, Seong-Ook Park	Clock Offsets in TDOA Localization.	UCS	2006	DBLP DOI BibTeX RDF
26	Karim Traore, Emmanuel Grolleau, Francis Cottet	Characterization and Analysis of Tasks with Offsets: Monotonic Transactions.	RTCSA	2006	DBLP DOI BibTeX RDF
26	Sajid Ahmed, Sangarapillai Lambotharan, Andreas Jakobsson, Jonathon A. Chambers	Parameter estimation and equalization techniques for communication channels with multipath and multiple frequency offsets.	IEEE Trans. Commun.	2005	DBLP DOI BibTeX RDF
26	Defeng Huang, Khaled Ben Letaief	An interference-cancellation scheme for carrier frequency offsets correction in OFDMA systems.	IEEE Trans. Commun.	2005	DBLP DOI BibTeX RDF
26	Peter Jung 0001, Gerhard Wunder	On time-variant distortions in multicarrier transmission with application to frequency offsets and phase noise.	IEEE Trans. Commun.	2005	DBLP DOI BibTeX RDF
26	Mingxuan Sun, Danwei Wang, Youyi Wang	Reducing the effect of initial condition offsets using selective previous cycle data.	ICARCV	2004	DBLP DOI BibTeX RDF
26	João Batista S. de Oliveira, Luiz Henrique de Figueiredo	Robust Approximation of Offsets, Bisectors, and Medial Axes of Plane Curves.	Reliab. Comput.	2003	DBLP DOI BibTeX RDF
26	Robert Nieuwenhuis, Albert Oliveras	Congruence Closure with Integer Offsets.	LPAR	2003	DBLP DOI BibTeX RDF
26	Ola Redell, Martin Törngren	Calculating Exact Worst Case Response Times for Static Priority Scheduled Tasks with Offsets and Jitter.	IEEE Real Time Technology and Applications Symposium	2002	DBLP DOI BibTeX RDF
23	Dominique Attali, André Lieutier	Reconstructing shapes with guarantees by unions of convex sets.	SCG	2010	DBLP DOI BibTeX RDF	homotopy equivalence, union of convex sets, sampling, minkowski sum, shape reconstruction, offsets
23	Xinghua Song, Bert Jüttler, Adrien Poteaux	Hierarchical Spline Approximation of the Signed Distance Function.	Shape Modeling International	2010	DBLP DOI BibTeX RDF	signed distance function, hierarchical T-spline, trimmed offsets
23	Takis Sakkalis, Thomas J. Peters	Ambient isotopic approximations for surface reconstruction and interval solids.	Symposium on Solid Modeling and Applications	2003	DBLP DOI BibTeX RDF	ambient isotopy, interval solids, offsets and deformations, reverse engineering, surface reconstruction, computational topology
23	Yu-Sung Chang, Kevin T. McDonnell, Hong Qin 0001	A new solid subdivision scheme based on box splines.	Symposium on Solid Modeling and Applications	2002	DBLP DOI BibTeX RDF	offsets & deformations, representation conversion, user interaction techniques, reverse engineering, blends, sweeps, multi resolution models, geometric and topological representations
23	Alexis Angelidis, Marie-Paule Cani	Adaptive implicit modeling using subdivision curves and surfaces as skeletons.	Symposium on Solid Modeling and Applications	2002	DBLP DOI BibTeX RDF	offsets & deformations, blends, sweeps, multi resolution models, heterogeneous models
23	Ron Kimmel, Nahum Kiryati, Alfred M. Bruckstein	Analyzing and Synthesizing Images by Evolving Curves with the Osher-Sethian Method.	Int. J. Comput. Vis.	1997	DBLP DOI BibTeX RDF	distance maps, minimal geodesics, segmentation, shape from shading, numerical methods, halftoning, offsets
23	Jonathan D. Cohen 0001, Amitabh Varshney, Dinesh Manocha, Greg Turk, Hans Weber, Pankaj K. Agarwal, Frederick P. Brooks Jr., William V. Wright	Simplification Envelopes.	SIGGRAPH	1996	DBLP DOI BibTeX RDF	hierarchical approximation, levels-of-detail generation, geometric modeling, model simplification, shape approximation, offsets
20	Christian Holz 0001, Patrick Baudisch	The generalized perceived input point model and how to double touch accuracy by extracting fingerprints.	CHI	2010	DBLP DOI BibTeX RDF	6dof, fingerprint scanner, touch pad, mobile devices, pointing, touch screen, precision, touch, input, targeting
20	Alessandro Armando, Maria Paola Bonacina, Silvio Ranise, Stephan Schulz 0001	New results on rewrite-based satisfiability procedures.	ACM Trans. Comput. Log.	2009	DBLP DOI BibTeX RDF	combination of theories, satisfiability modulo a theory, scalability, inference, termination, Automated reasoning, decision procedures, rewriting, superposition
20	Xiao Li, Yik-Chung Wu, Erchin Serpedin	Timing Synchronization in Decode-and-Forward Cooperative Communication Systems.	IEEE Trans. Signal Process.	2009	DBLP DOI BibTeX RDF
20	Chung Lun Li, Zhou Gang, Chi Wah Chan	A Graphical Approach to Approximate Offset Computation.	CGIV	2009	DBLP DOI BibTeX RDF
20	Anthony Rowe 0001, Vikram Gupta, Ragunathan Rajkumar	Low-power clock synchronization using electromagnetic energy radiating from AC power lines.	SenSys	2009	DBLP DOI BibTeX RDF	hardware clock synchronization, wireless sensor networks, sensor networks, synchronization
20	Fei Qin, Yang Yang 0001, John E. Mitchell 0002	Performance increase through the use of multiple sub-carriers in WSN.	MOBIWAC	2009	DBLP DOI BibTeX RDF	cfo, multi-carrier, wireless sensor networks, throughput, power efficiency
20	Senem Velipasalar, Wayne H. Wolf	Frame-level temporal calibration of video sequences from unsynchronized cameras.	Mach. Vis. Appl.	2008	DBLP DOI BibTeX RDF	Temporal calibration, Frame offset, Unsynchronized cameras, Trajectory alignment, Object tracking
20	Daniel Kubus, Torsten Kröger, Friedrich M. Wahl	Improving force control performance by computational elimination of non-contact forces/torques.	ICRA	2008	DBLP DOI BibTeX RDF
20	Chong Feng, Jianhua Zhang 0001, Yanyan Zhang, Minghua Xia	A Novel Timing Synchronization Method for MIMO OFDM Systems.	VTC Spring	2008	DBLP DOI BibTeX RDF
20	Feng Tian, Xiang-Gen Xia 0001, Pak-Chung Ching	Signal Detection in a Cooperative Communication System with Multiple CFOs by Exploiting the Properties of Space-Frequency Codes.	ICC	2008	DBLP DOI BibTeX RDF
20	Luca Sanguinetti, Michele Morelli, H. Vincent Poor	An Improved Scheme for Initial Ranging in OFDMA-Based Networks.	ICC	2008	DBLP DOI BibTeX RDF
20	Xiaoyong Guo, Xiang-Gen Xia 0001	Distributed Linear Convolutive Space-Time Codes for Asynchronous Cooperative Communication Networks.	ICC	2008	DBLP DOI BibTeX RDF
20	Chunpeng Yan, H. Howard Fan	Asynchronous differential TDOA for non-GPS navigation using signals of opportunity.	ICASSP	2008	DBLP DOI BibTeX RDF
20	Wen-Chih Wu, Oscal T.-C. Chen	Robust echo hiding scheme against pitch-scaling attacks.	ICASSP	2008	DBLP DOI BibTeX RDF
20	Christian Ruwwe, Bjoern Keck, Oliver Rusch, Udo Zölzer, Xavier Loison	Image registration by means of 3D octree correlation.	MMSP	2008	DBLP DOI BibTeX RDF
20	Manav R. Bhatnagar, Are Hjørungnes, Lingyang Song	Amplify-and-Forward Cooperative Communications Using Double-Differential Modulation over Nakagami-m Channels.	WCNC	2008	DBLP DOI BibTeX RDF
20	Seung Sik Choi	Analysis of Low Latency MAC Protocols for Clustered Sensor Networks.	WCNC	2008	DBLP DOI BibTeX RDF
20	Xiaotong Zhuang, Santosh Pande	Power-efficient prefetching for embedded processors.	ACM Trans. Embed. Comput. Syst.	2007	DBLP DOI BibTeX RDF	bit-differential addressing, offset assignment, embedded processors, Data prefetching
20	Olivier Rabaste, Thierry Chonavel	Estimation of Multipath Channels With Long Impulse Response at Low SNR via an MCMC Method.	IEEE Trans. Signal Process.	2007	DBLP DOI BibTeX RDF
20	Patrick Vandewalle, Luciano Sbaiz, Joos Vandewalle, Martin Vetterli	Super-Resolution From Unregistered and Totally Aliased Signals Using Subspace Methods.	IEEE Trans. Signal Process.	2007	DBLP DOI BibTeX RDF
20	Shoulie Xie, Susanto Rahardja, Zhenghui Gu	Performance of DS-CDMA Downlink Systems With Orthogonal UCHT Complex Sequences.	IEEE Trans. Commun.	2007	DBLP DOI BibTeX RDF
20	Pingan Li, Khaled Ben Letaief	A Blind RAKE Receiver With Robust Multiuser Interference Cancelation for DS/CDMA Communications.	IEEE Trans. Commun.	2007	DBLP DOI BibTeX RDF
20	Marco Villanti, Paola Salmi, Giovanni Emanuele Corazza	Differential Post Detection Integration Techniques for Robust Code Acquisition.	IEEE Trans. Commun.	2007	DBLP DOI BibTeX RDF
20	Guoning Hu, DeLiang Wang	Auditory Segmentation Based on Onset and Offset Analysis.	IEEE Trans. Speech Audio Process.	2007	DBLP DOI BibTeX RDF
20	Chunpeng Yan, H. Howard Fan	Asynchronous Self-Localization of Sensor Networks with Large Clock Drift.	MobiQuitous	2007	DBLP DOI BibTeX RDF
20	M. A. Nasr, Heba A. Shaban, William H. Tranter	Outage Probability and Percentage of Cell Area for OFDMA Cellular Systems with Sectoring.	CNSR	2007	DBLP DOI BibTeX RDF
20	James Patrick Underwood, Andrew John Hill, Steve Scheding	Calibration of range sensor pose on mobile platforms.	IROS	2007	DBLP DOI BibTeX RDF
20	Zhongshan Zhang, Chintha Tellambura	The Effect of Imperfect Carrier Frequency Offset Estimation on OFDMA Uplink Transmission.	ICC	2007	DBLP DOI BibTeX RDF
20	Dania Marabissi, Romano Fantacci, Simone Papini	Robust Multiuser Interference Cancellation for OFDM Systems With Frequency Offset.	IEEE Trans. Wirel. Commun.	2006	DBLP DOI BibTeX RDF
20	Xiaolin Luo, Mostofa K. Howlader	Noncoherent decoder-assisted frame synchronization for packet transmission.	IEEE Trans. Wirel. Commun.	2006	DBLP DOI BibTeX RDF