Search results for "LS-ICA"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
113	Jun-Ying Gan, Chun-zhi Li, Dang-pei Zhou	A Novel Method for 2DPCA-ICA in Face Recognition.	ICIC (3)	2007	DBLP DOI BibTeX RDF	Face Recognition, ICA, 2DPCA
108	Kun Zhang 0001, Lai-Wan Chan	ICA by PCA Approach: Relating Higher-Order Statistics to Second-Order Moments.	ICA	2006	DBLP DOI BibTeX RDF
107	Jongsun Kim, Jongmoo Choi, Juneho Yi, Matthew A. Turk	Effective Representation Using ICA for Face Recognition Robust to Local Distortion and Partial Occlusion.	IEEE Trans. Pattern Anal. Mach. Intell.	2005	DBLP DOI BibTeX RDF	part-based local representation, LS-ICA, Face recognition, ICA
105	Jiajin Lei, Tim Lay, Chris Weiland, Chao Lu 0002	A Combination of Spatiotemporal ICA and Euclidean Features for Face Recognition.	IFIP AI	2006	DBLP DOI BibTeX RDF	Spatiotemporal ICA, Face recognition, Machine vision
103	Anke Meyer-Bäse, Fabian J. Theis, Oliver Lange, Carlos García Puntonet	Tree-Dependent and Topographic Independent Component Analysis for fMRI Analysis.	ICA	2004	DBLP DOI BibTeX RDF
96	Jian Yang 0003, David Zhang 0001, Jing-Yu Yang 0001	Constructing PCA Baseline Algorithms to Reevaluate ICA-Based Face-Recognition Performance.	IEEE Trans. Syst. Man Cybern. Part B	2007	DBLP DOI BibTeX RDF
94	Baijie Wang, Ercan E. Kuruoglu, Junying Zhang	ICA by Maximizing Non-stability.	ICA	2009	DBLP DOI BibTeX RDF	non-stability, alpha-stable negentropy, impulsive signals, ICA, source separation
91	Jun-Yu Chen, Qiu-Hua Lin	A Semi-blind Complex ICA Algorithm for Extracting a Desired Signal Based on Kurtosis Maximization.	ISNN (2)	2008	DBLP DOI BibTeX RDF	Constrained ICA, Complex-valued signal, Kurtosis maximization, Magnitude information, Independent component analysis (ICA)
90	Satoshi Ukai, Hiroshi Saruwatari, Tomoya Takatani, Kiyohiro Shikano, Ryo Mukai, Hiroshi Sawada	Evaluation of Multistage SIMO-Model-Based Blind Source Separation Combining Frequency-Domain ICA and Time-Domain ICA.	ICA	2004	DBLP DOI BibTeX RDF
89	Seung-In Noh, Kwanghyuk Bae, Kang Ryoung Park, Jaihie Kim	A New Feature Extraction Method Using the ICA Filters for Iris Recognition System.	IWBRS	2005	DBLP DOI BibTeX RDF
88	Addisson Salazar, Arturo Serrano, Raul Llinares, Luis Vergara, Jorge Igual	ICA Mixture Modeling for the Classification of Materials in Impact-Echo Testing.	ICA	2009	DBLP DOI BibTeX RDF	ICA mixtures, Non-destructive evaluation, Impact-echo testing, ICA
86	Jarkko Ylipaavalniemi, Jyri Soppela	Arabica: Robust ICA in a Pipeline.	ICA	2009	DBLP DOI BibTeX RDF	pipeline, ICA, bootstrapping, fMRI, Toolbox
86	Flávio Henrique Vieira Teles, Lígia Maria Carvalho Sousa, George Emmanuel Bozinis, Wesley F. de Miranda, Charles Casimiro Cavalcante	Network Traffic Flow Separation and Control Through a Hybrid ICA-Fuzzy Adaptive Algorithm.	ICA	2009	DBLP DOI BibTeX RDF	Traffic Separation, Bell-Sejnowski algorithm, Prediction, ICA, Independent Component Analysis, Fuzzy Control, Network Traffic
85	Jinwen Ma, Zhe Chen 0001, Shun-ichi Amari	Analysis of Feasible Solutions of the ICA Problem Under the One-Bit-Matching Condition.	ICA	2006	DBLP DOI BibTeX RDF
85	Fan Chen 0002, Kazunori Kotani	Facial Expression Recognition by ICA with Selective Prior.	ICA	2006	DBLP DOI BibTeX RDF
84	Wenming Cao 0001, Fei Lu 0003, Yuan Yuan, Shoujue Wang	Face Recognition Technique Based on Modular ICA Approach.	Intelligent Information Processing	2004	DBLP DOI BibTeX RDF	Modular ICA, Face recognition, ICA
81	Hiroko Kato Solvang, Yuichi Nagahara, Shoko Araki, Hiroshi Sawada, Shoji Makino	Frequency-Domain Pearson Distribution Approach for Independent Component Analysis (FD-Pearson-ICA) in Blind Source Separation.	IEEE Trans. Speech Audio Process.	2009	DBLP DOI BibTeX RDF
81	Zhaojun Xue, Jia Li, Song Li, Baikun Wan	Using ICA to Remove Eye Blink and Power Line Artifacts in EEG.	ICICIC (3)	2006	DBLP DOI BibTeX RDF
81	Jian Yang 0003, David Zhang 0001, Jing-Yu Yang 0001	Is ICA Significantly Better than PCA for Face Recognition?.	ICCV	2005	DBLP DOI BibTeX RDF
80	Shoji Makino, Hiroshi Sawada, Shoko Araki	Blind Audio Source Separation Based on Independent Component Analysis.	ICA	2007	DBLP DOI BibTeX RDF
80	Hao Shen, Knut Hüper	On the Relationships Between Power Iteration, Inverse Iteration and FastICA.	ICA	2007	DBLP DOI BibTeX RDF
80	Jörn Anemüller, Terrence J. Sejnowski, Scott Makeig	Reliable Measurement of Cortical Flow Patterns Using Complex Independent Component Analysis of Electroencephalographic Signals.	ICA	2004	DBLP DOI BibTeX RDF
79	Ju Liu, Yu Du, Jing Li, Kaibao Nie	A New Method for Eliminating Stimulus Artifact in Transient Evoked Otoacoustic Emission Using ICA.	ICA	2004	DBLP DOI BibTeX RDF	TEOAE, Stimulus artifact, ICA
77	Frank C. Meinecke, Stefan Harmeling, Klaus-Robert Müller	Robust ICA for Super-Gaussian Sources.	ICA	2004	DBLP DOI BibTeX RDF
75	Tian Lan, Yonghong Huang, Deniz Erdogmus	A Comparison of Linear ICA and Local Linear ICA for Mutual Information Based Feature Ranking.	ICA	2006	DBLP DOI BibTeX RDF
73	Chengjun Liu, Jian Yang 0003	ICA Color Space for Pattern Recognition.	IEEE Trans. Neural Networks	2009	DBLP DOI BibTeX RDF
73	François B. Vialatte, Jordi Solé i Casals, Monique Maurice, Charles-François Vincent Latchoumane, Nigel R. Hudson, Sunil Wimalaratna, Jaeseung Jeong, Andrzej Cichocki	Improving the Quality of EEG Data in Patients with Alzheimer's Disease Using ICA.	ICONIP (2)	2008	DBLP DOI BibTeX RDF
72	Jinwen Ma, Dengpan Gao, Fei Ge, Shun-ichi Amari	A One-Bit-Matching Learning Algorithm for Independent Component Analysis.	ICA	2006	DBLP DOI BibTeX RDF
72	Dorothea Kolossa, Reinhold Orglmeister	Nonlinear Postprocessing for Blind Speech Separation.	ICA	2004	DBLP DOI BibTeX RDF
71	Danton Diego Ferreira, Antônio Maurício Ferreira Leite Miranda de Sá, Augusto Santiago Cerqueira, José Manoel de Seixas	ICA-Based Method for Quantifying EEG Event-Related Desynchronization.	ICA	2009	DBLP DOI BibTeX RDF	ERD, ERS, ICA, EEG, ERP, IPS
71	Steffen Unkel, Nickolay T. Trendafilov	Factor Analysis as Data Matrix Decomposition: A New Approach for Quasi-Sphering in Noisy ICA.	ICA	2009	DBLP DOI BibTeX RDF	Noisy ICA, Less observations than variables, Factor rotation, Procrustes problems, Climate anomalies, Exploratory factor analysis
70	M. Alex O. Vasilescu, Demetri Terzopoulos	Multilinear (Tensor) ICA and Dimensionality Reduction.	ICA	2007	DBLP DOI BibTeX RDF
70	Markus Borschbach, Martin Pyka	Specific Circumstances on the Ability of Linguistic Feature Extraction Based on Context Preprocessing by ICA.	ICA	2007	DBLP DOI BibTeX RDF
70	Fei Liu 0001, Chang-Ying Wu	Improvement on Multivariate Statistical Process Monitoring Using Multi-scale ICA.	ICA	2006	DBLP DOI BibTeX RDF
70	Yoshimitsu Mori, Hiroshi Saruwatari, Tomoya Takatani, Kiyohiro Shikano, Takashi Hiekata, Takashi Morita	ICA and Binary-Mask-Based Blind Source Separation with Small Directional Microphones.	ICA	2006	DBLP DOI BibTeX RDF
70	Yong-Rui Zheng, Qiu-Hua Lin, Fuliang Yin, Hualou Liang	Speech Enhancement Using ICA with EMD-Based Reference.	ICA	2006	DBLP DOI BibTeX RDF
70	Mika Inki	An Easily Computable Eight Times Overcomplete ICA Method for Image Data.	ICA	2006	DBLP DOI BibTeX RDF
70	José Joaquín Rieta, César Sánchez 0002, Juan Manuel Sanchis, Francisco Castells, José Millet	Mixing Matrix Pseudostationarity and ECG Preprocessing Impact on ICA-Based Atrial Fibrillation Analysis.	ICA	2004	DBLP DOI BibTeX RDF
70	Hyun-Jin Park, Te-Won Lee	A Hierarchical ICA Method for Unsupervised Learning of Nonlinear Dependencies in Natural Images.	ICA	2004	DBLP DOI BibTeX RDF
70	Patricia Mayo, Francisco Rodenas Escriba, Gumersindo Verdú Martín	Denoising Mammographic Images Using ICA.	ICA	2004	DBLP DOI BibTeX RDF
70	Wei Lu, Jian Zhang, Xiaobing Sun, Kanzo Okada	A Digital Watermarking Technique Based on ICA Image Features.	ICA	2004	DBLP DOI BibTeX RDF
68	Faqiang Xu, Xiaoxia Wan	Color Component Prediction Based on Damped Modified Independent Component Analysis.	CSSE (6)	2008	DBLP DOI BibTeX RDF
68	Lei Zhang 0006, Quanxue Gao, David Zhang 0001	Block Independent Component Analysis for Face Recognition.	ICIAP	2007	DBLP DOI BibTeX RDF
67	Ling Huang, Jinhong Zhong	ICA-Based Potential Significant Feature Extraction for Market Forecast.	CIMCA/IAWTIC	2006	DBLP DOI BibTeX RDF	prediction of dynamic data, Radial Basis Function Neural Network (RBF NN), Principal Component Analysis (PCA), Independent Component Analysis (ICA)
66	Ioan Buciu, Costas Kotropoulos, Ioannis Pitas	Comparison of ICA approaches for facial expression recognition.	Signal Image Video Process.	2009	DBLP DOI BibTeX RDF	Super-Gaussian distribution, Sub-Gaussian distribution, Nonlinear mixtures of independent sources, Cosine similarity measure classifier, Independent component analysis, Correlation, Mutual information, Facial expression recognition, Statistical significance, Kurtosis, Support vector machine classifier
66	Ryu Takeda, Kazuhiro Nakadai, Kazuhiro Komatani, Tetsuya Ogata, Hiroshi G. Okuno	Exploiting known sound source signals to improve ICA-based robot audition in speech separation and recognition.	IROS	2007	DBLP DOI BibTeX RDF
66	Jiajin Lei, Chao Lu 0002	Face Recognition by Spatiotemporal ICA Using Facial Database Collected by AcSys FRS Discover System.	SNPD	2006	DBLP DOI BibTeX RDF
66	Yoshitatsu Matsuda, Kazunori Yamaguchi	A Fixed-Point Algorithm of Topographic ICA.	ICANN (2)	2006	DBLP DOI BibTeX RDF
66	Jongsun Kim, Jongmoo Choi, Juneho Yi	ICA Based Face Recognition Robust to Partial Occlusions and Local Distortions.	ICBA	2004	DBLP DOI BibTeX RDF
66	Mehmet Üzümcü, Alejandro F. Frangi, Milan Sonka, Johan H. C. Reiber, Boudewijn P. F. Lelieveldt	ICA vs. PCA Active Appearance Models: Application to Cardiac MR Segmentation.	MICCAI (1)	2003	DBLP DOI BibTeX RDF
66	Juneho Yi, Jongsun Kim, Jongmoo Choi, JungHyun Han, Eunseok Lee 0001	Face Recognition Based on ICA Combined with FLD.	Biometric Authentication	2002	DBLP DOI BibTeX RDF
65	Sang-Gyun Kim, Chang D. Yoo	Underdetermined Independent Component Analysis by Data Generation.	ICA	2004	DBLP DOI BibTeX RDF
65	Paul F. Stetson	Independent Component Analysis of Pulse Oximetry Signals Based on Derivative Skew.	ICA	2004	DBLP DOI BibTeX RDF
62	Dana Lahat, Jean-François Cardoso, Hagit Messer	Optimal Performance of Second-Order Multidimensional ICA.	ICA	2009	DBLP DOI BibTeX RDF	correlated sources, multidimensional components, joint block diagonalization, performance analysis, Independent component analysis, blind source separation
62	Abhijit Mandal, Arnab Chakraborty	Independent Component Analysis (ICA) Using Pearsonian Density Function.	ICA	2009	DBLP DOI BibTeX RDF	Pearsonian density function, Independent component analysis, blind signal separation
62	Keisuke Toyama 0002, Mark D. Plumbley	Estimating Phase Linearity in the Frequency-Domain ICA Demixing Matrix.	ICA	2009	DBLP DOI BibTeX RDF
62	Qiang Zhang, Jiande Sun 0001, Ju Liu, Xinghua Sun	A Novel ICA-Based Image/Video Processing Method.	ICA	2007	DBLP DOI BibTeX RDF	Image/Video Processing, Digital Wavelet Transform, Independent Component Analysis
62	Naoya Ohnishi, Atsushi Imiya	ICA-Based Image Analysis for Robot Vision.	ICA	2007	DBLP DOI BibTeX RDF
62	Frédéric Vrins, Michel Verleysen	Minimum Support ICA Using Order Statistics. Part II: Performance Analysis.	ICA	2006	DBLP DOI BibTeX RDF
62	Jarkko Ylipaavalniemi, Seppo Mattila, Antti Tarkiainen, Ricardo Vigário	Brains and Phantoms: An ICA Study of fMRI.	ICA	2006	DBLP DOI BibTeX RDF
62	Shohei Shimizu, Aapo Hyvärinen, Yutaka Kano, Patrik O. Hoyer, Antti J. Kerminen	Testing Significance of Mixing and Demixing Coefficients in ICA.	ICA	2006	DBLP DOI BibTeX RDF
62	Jianzhao Qin, Yuanqing Li, Qijin Liu	ICA Based Semi-supervised Learning Algorithm for BCI Systems.	ICA	2006	DBLP DOI BibTeX RDF
62	David Alleysson, Sabine Süsstrunk	Spatio-chromatic ICA of a Mosaiced Color Image.	ICA	2004	DBLP DOI BibTeX RDF
62	V. Sanchez-Poblador, Enric Monte-Moreno, Jordi Solé i Casals	ICA as a Preprocessing Technique for Classification.	ICA	2004	DBLP DOI BibTeX RDF
62	Mike Davies	Identifiability, Subspace Selection and Noisy ICA.	ICA	2004	DBLP DOI BibTeX RDF
62	Sarit Shwartz, Michael Zibulevsky, Yoav Y. Schechner	ICA Using Kernel Entropy Estimation with NlogN Complexity.	ICA	2004	DBLP DOI BibTeX RDF
62	Mark D. Plumbley	Optimization Using Fourier Expansion over a Geodesic for Non-negative ICA.	ICA	2004	DBLP DOI BibTeX RDF
62	Jörn Anemüller, Jeng-Ren Duann, Terrence J. Sejnowski, Scott Makeig	Unraveling Spatio-temporal Dynamics in fMRI Recordings Using Complex ICA.	ICA	2004	DBLP DOI BibTeX RDF
61	Issam Dagher, Rabih Nachar	Face Recognition Using IPCA-ICA Algorithm.	IEEE Trans. Pattern Anal. Mach. Intell.	2006	DBLP DOI BibTeX RDF	IPCA-ICA, principal non-Gaussian directions, image processing, Principal component analysis (PCA), independent component analysis (ICA), blind source separation
60	Sangkyun Lee, Soo-Young Lee	ICA-Based Spatio-temporal Features for EEG Signals.	ICONIP (2)	2007	DBLP DOI BibTeX RDF	single-trial EEG, Independent Component Analysis (ICA), Brain-Computer Interface, Spatio-Temporal filter
60	David C. Roberts, David A. Grossman, Ophir Frieder, Robert Bernstein, Eric Bisfiop	Performance testing of communication protocols for three-tier computing: results for ICA and X window protocols.	ICCCN	1997	DBLP DOI BibTeX RDF	three-tier computing, ICA protocols, X window protocols, Windows NT operating system, data server, stored databases, Tier 1, Tier 2, client program, desktop machines, Tier 3, intelligence computer architecture, Microsoft Office 97, Lotus Notes applications, user interface, data compression, data compression, communication protocols, network traffic, application server, performance testing, network bandwidth, multi-user environment
59	Francesco Nesta, Piergiorgio Svaizer, Maurizio Omologo	Cumulative State Coherence Transform for a Robust Two-Channel Multiple Source Localization.	ICA	2009	DBLP DOI BibTeX RDF	TDOA estimation, multiple speaker localization, independent component analysis (ICA), Blind source separation (BSS)
58	Graham W. Taylor, Michael L. Seltzer, Alex Acero	Maximum a posteriori ICA: Applying prior knowledge to the separation of acoustic sources.	ICASSP	2008	DBLP DOI BibTeX RDF
58	Hiroshi Saruwatari, Toshiya Kawamura, Tsuyoki Nishikawa, Akinobu Lee, Kiyohiro Shikano	Blind source separation based on a fast-convergence algorithm combining ICA and beamforming.	IEEE Trans. Speech Audio Process.	2006	DBLP DOI BibTeX RDF
58	Byeong Il Lee, Jae Sung Lee, Dong Soo Lee, Seungjin Choi	Myocardial Blood Flow Quantification in Dynamic PET: An Ensemble ICA Approach.	ICANN (2)	2005	DBLP DOI BibTeX RDF
58	Jinwen Ma, Zhiyong Liu, Lei Xu 0001	Local Separation Property of the Two-Source ICA Problem with the One-Bit-Matching Condition.	IDEAL	2004	DBLP DOI BibTeX RDF
58	Qiu-Hua Lin, Yong-Rui Zheng, Fuliang Yin, Hualou Liang	Speech Segregation Using Constrained ICA.	ISNN (1)	2004	DBLP DOI BibTeX RDF
57	Florian Kohl, Gerd Wübbeler, Dorothea Kolossa, Clemens Elster, Markus Bär, Reinhold Orglmeister	Non-independent BSS: A Model for Evoked MEG Signals with Controllable Dependencies.	ICA	2009	DBLP DOI BibTeX RDF
57	Jian Ma, Zengqi Sun	Copula Component Analysis.	ICA	2007	DBLP DOI BibTeX RDF
57	Kun Zhang 0001, Laiwan Chan	Kernel-Based Nonlinear Independent Component Analysis.	ICA	2007	DBLP DOI BibTeX RDF
57	Sergey Borisov, Alexander Ilin, Ricardo Vigário, Erkki Oja	Comparison of BSS Methods for the Detection of alpha-Activity Components in EEG.	ICA	2006	DBLP DOI BibTeX RDF
57	Hiroshi Sawada, Shoko Araki, Ryo Mukai, Shoji Makino	On Calculating the Inverse of Separation Matrix in Frequency-Domain Blind Source Separation.	ICA	2006	DBLP DOI BibTeX RDF
57	Alexander Ilin, Antti Honkela	Post-nonlinear Independent Component Analysis by Variational Bayesian Learning.	ICA	2004	DBLP DOI BibTeX RDF
56	Francesco Palmieri 0001, Alessandra Budillon	Generalized Independent Component Analysis as Density Estimation.	WIRN	2002	DBLP DOI BibTeX RDF	Generalized ICA, Multilayer ICA, Density estimator
56	Liwei Fan, Kim Leng Poh	A Comparative Study of PCA, ICA and Class-Conditional ICA for Naïve Bayes Classifier.	IWANN	2007	DBLP DOI BibTeX RDF	Naïve Bayes Classifier, Classification, Bayesian Network, Independent Component Analysis, Principle Component Analysis
55	Everton Z. Nadalin, Ricardo Suyama, Romis Ribeiro Faissol Attux	An ICA-Based Method for Blind Source Separation in Sparse Domains.	ICA	2009	DBLP DOI BibTeX RDF	blind identification, independent component analysis, audio signal processing, Sparse component analysis
55	Byeong-Geun Cheon, Yong-Wan Roh, Dong-Ju Kim, Kwang-Seok Hong	An Implementation of Floral Scent Recognition System Using ICA Combined with Correlation Coefficients.	ICA	2009	DBLP DOI BibTeX RDF	Floral Scent Recognition, Independent Component Analysis, Correlation Coefficient, Electronic Nose
55	Arie Yeredor	ICA in Boolean XOR Mixtures.	ICA	2007	DBLP DOI BibTeX RDF
55	Juan José González de la Rosa, Carlos García Puntonet, Antonio Moreno-Muñoz, A. Illana, J. A. Carmona	An Application of ICA to BSS in a Container Gantry Crane Cabin's Model.	ICA	2007	DBLP DOI BibTeX RDF
55	Jean-François Cardoso, Maude Martin	A Flexible Component Model for Precision ICA.	ICA	2007	DBLP DOI BibTeX RDF
55	Eugen Hoffmann, Dorothea Kolossa, Reinhold Orglmeister	A Batch Algorithm for Blind Source Separation of Acoustic Signals Using ICA and Time-Frequency Masking.	ICA	2007	DBLP DOI BibTeX RDF
55	Heriberto Zavala-Fernández, Tilmann Heinrich Sander, Martin Burghoff, Reinhold Orglmeister, Lutz Trahms	Multi-modal ICA Exemplified on Simultaneously Measured MEG and EEG Data.	ICA	2007	DBLP DOI BibTeX RDF
55	Heriberto Zavala-Fernández, Tilmann Heinrich Sander, Martin Burghoff, Reinhold Orglmeister, Lutz Trahms	Comparison of ICA Algorithms for the Isolation of Biological Artifacts in Magnetoencephalography.	ICA	2006	DBLP DOI BibTeX RDF
55	Frédéric Vrins, Michel Verleysen	Minimum Support ICA Using Order Statistics. Part I: Quasi-range Based Support Estimation.	ICA	2006	DBLP DOI BibTeX RDF
55	Yoshitatsu Matsuda, Kazunori Yamaguchi	The InfoMin Principle for ICA and Topographic Mappings.	ICA	2006	DBLP DOI BibTeX RDF
55	Liran Shen, Xueyao Li, Qingbo Yin, Huiqiang Wang	Speech Enhancement in Short-Wave Channel Based on ICA in Empirical Mode Decomposition Domain.	ICA	2006	DBLP DOI BibTeX RDF
55	José Joaquín Rieta, Fernando Hornero, César Sánchez 0002, Carlos Vayá, David Moratal, Juan Manuel Sanchis	Derivation of Atrial Surface Reentries Applying ICA to the Standard Electrocardiogram of Patients in Postoperative Atrial Fibrillation.	ICA	2006	DBLP DOI BibTeX RDF
55	Juha Karvanen, Toshihisa Tanaka	Temporal Decorrelation as Preprocessing for Linear and Post-nonlinear ICA.	ICA	2004	DBLP DOI BibTeX RDF
55	Kevin A. Glass, Gwen A. Frishkoff, Robert M. Frank, Colin Davey, Joseph Dien, Allen D. Malony, Don M. Tucker	A Framework for Evaluating ICA Methods of Artifact Removal from Multichannel EEG.	ICA	2004	DBLP DOI BibTeX RDF
55	Lieven De Lathauwer, Joos Vandewalle	Dimensionality Reduction in ICA and Rank-(R1, R2, ..., RN) Reduction in Multilinear Algebra.	ICA	2004	DBLP DOI BibTeX RDF