Search results for "posts"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
84	Seok-Ho Yoon, Jung-Hwan Shin, Sang-Wook Kim, Sunju Park	Extraction of a latent blog community based on subject.	CIKM	2009	DBLP DOI BibTeX RDF	community extraction, latent communities, blogosphere
72	Mostafa Keikha	Investigation on smoothing and aggregation methods in blog retrieval.	SIGIR	2010	DBLP DOI BibTeX RDF	user generated data, temporal analysis, blog search
72	Hyoseop Shin, Jeehoon Lee	Ranking user-created contents by search user's inclination in online communities.	WWW	2009	DBLP DOI BibTeX RDF	post ranking, search user inclination, user ranking, online community, expertise, popularity
60	Chen Lin 0001, Jiang-Ming Yang, Rui Cai, Xin-Jing Wang, Wei Wang 0009, Lei Zhang 0001	Simultaneously modeling semantics and structure of threaded discussions: a sparse coding approach and its applications.	SIGIR	2009	DBLP DOI BibTeX RDF	junk identification, reply reconstruction, expert finding, sparse coding, threaded discussion
60	Jean-Yves Delort	Identifying commented passages of documents using implicit hyperlinks.	Hypertext	2006	DBLP DOI BibTeX RDF	implicit links, passage extraction, weblogs
50	Yeha Lee, Seung-Hoon Na, Jong-Hyeok Lee	An improved feedback approach using relevant local posts for blog feed retrieval.	CIKM	2009	DBLP DOI BibTeX RDF	blog distillation, feed search, pseudo-relevance feedback
48	Vasileios Kandylas, Ali Dasdan	The utility of tweeted URLs for web search.	WWW	2010	DBLP DOI BibTeX RDF	content quality, shortened urls, twitter, microblogging
48	Xin Li, Jun Yan 0001, Weiguo Fan, Ning Liu 0001, Shuicheng Yan, Zheng Chen 0001	An online blog reading system by topic clustering and personalized ranking.	ACM Trans. Internet Techn.	2009	DBLP DOI BibTeX RDF	connected subgraph, content information, link information, personalization, ranking, Blog, story, topic
48	Meiyang Chen, Yijun Liu	Research on the Best Time to Intervene into Network Public Opinion for Managers -Based on "Nankai Buick Affair"-.	Complex (2)	2009	DBLP DOI BibTeX RDF	Network Public Opinion, The Best Time to Intervene, Skewness, Kurtosis
43	Carlos Castro-Herrera, Jane Cleland-Huang, Bamshad Mobasher	A recommender system for dynamically evolving online forums.	RecSys	2009	DBLP DOI BibTeX RDF	clustering, threads, requirements elicitation, online forums, posts, collaborative recommender systems
38	Sang-Hyob Nam, Seung-Hoon Na, Yeha Lee, Jong-Hyeok Lee	DiffPost: Filtering Non-relevant Content Based on Content Difference between Two Consecutive Blog Posts.	ECIR	2009	DBLP DOI BibTeX RDF
38	Gilad Mishne	AutoTag: a collaborative approach to automated tag assignment for weblog posts.	WWW	2006	DBLP DOI BibTeX RDF	tags, blogs
38	Kathleen T. Durant, Michael D. Smith 0001	Predicting the Political Sentiment of Web Log Posts Using Supervised Machine Learning Techniques Coupled with Feature Selection.	WEBKDD	2006	DBLP DOI BibTeX RDF	Naïve Bayes, Support Vector Machines, feature selection, Blogs, Sentiment Classification, Web Logs, WEKA
36	Miles Efron	Hashtag retrieval in a microblogging environment.	SIGIR	2010	DBLP DOI BibTeX RDF	hashtag, relevance feedback, twitter, microblog
36	Anish Das Sarma, Atish Das Sarma, Sreenivas Gollapudi, Rina Panigrahy	Ranking mechanisms in twitter-like forums.	WSDM	2010	DBLP DOI BibTeX RDF	ranking mechanisms, thumb-based ranking, comparisons
36	Seung-Kyun Han, Dongmin Shin, Jae-Yoon Jung 0001, Jonghun Park	Exploring the Relationship between Keywords and Feed Elements in Blog Post Search.	World Wide Web	2009	DBLP DOI BibTeX RDF	blog post search, neural network, web 2.0, ranking, learning to rank, RSS feed
36	Long Wang 0002, Justus Bross, Christoph Meinel	Post Recommendation in Social Web Site.	EGOV	2009	DBLP DOI BibTeX RDF	Post recommendation, Global Support, Local Support, Clustering
36	Khalid El-Arini, Gaurav Veda, Dafna Shahaf, Carlos Guestrin	Turning down the noise in the blogosphere.	KDD	2009	DBLP DOI BibTeX RDF	personalization, blogs
36	Young Sik Kim, Kibeom Lee, Steve SangKi Han	Study on Collective Memory in the Blogosphere.	CSE (4)	2009	DBLP DOI BibTeX RDF
36	Shima Gerani, Mark James Carman, Fabio Crestani	Investigating Learning Approaches for Blog Post Opinion Retrieval.	ECIR	2009	DBLP DOI BibTeX RDF	Blog Post, Opinion Retrieval, Learning Methods
36	Eric McDermid, Robert W. Irving	Popular Matchings: Structure and Algorithms.	COCOON	2009	DBLP DOI BibTeX RDF
36	Yu-Ru Lin, Hari Sundaram, Yun Chi, Jun'ichi Tatemura, Belle L. Tseng	Detecting splogs via temporal dynamics using self-similarity analysis.	ACM Trans. Web	2008	DBLP DOI BibTeX RDF	splog detection, topology, Blogs, regularity, spam, self-similarity, temporal dynamics
36	Meishan Hu, Aixin Sun, Ee-Peng Lim	Comments-oriented blog summarization by sentence extraction.	CIKM	2007	DBLP DOI BibTeX RDF	requt, sentence selection, blog, comments
36	Ji-Han Jiang, KuoHua Kao, SingLing Lee	Energy-Efficient Data Dissemination in Wireless Sensor Networks.	UIC	2006	DBLP DOI BibTeX RDF
36	David J. Abraham, Telikepalli Kavitha	Dynamic Matching Markets and Voting Paths.	SWAT	2006	DBLP DOI BibTeX RDF
36	David J. Abraham, Robert W. Irving, Telikepalli Kavitha, Kurt Mehlhorn	Popular matchings.	SODA	2005	DBLP BibTeX RDF
36	Blair Nonnecke, Jennifer Preece	Lurker demographics: counting the silent.	CHI	2000	DBLP DOI BibTeX RDF	health-support, lurker, newgroup, Internet, email, traffic, membership, demographic, lurking, BBS, discussion list
31	A. J. Bernheim Brush, Xiaoqing Wang, Tammara Combs Turner, Marc A. Smith	Assessing differential usage of usenet social accounting meta-data.	CHI	2005	DBLP DOI BibTeX RDF	posters, reporting tools, social accounting metrics, community, authors, assessment, usenet, newsgroups, posts, threaded discussions
31	Helena Abecasis, Jorge Fernandes	The national initiative for people with special needs in the information society: the elderly, people with disabilities and long-term bed-ridden.	Workshop on Universal Accessibility of Ubiquitous Computing	2001	DBLP DOI BibTeX RDF	accessibility kits, info-inclusion, internet posts for all, telematic networks, assistive technologies, web accessibility, disabled, elderly, universal design
28	Zhongyuan Zhou, Ting (Tina) Li, Chang Liu, Yang Zhou, Ping Li, Si Wen	Why do social media users follow tourism-related posts? Roles of bloggers and posts in trip planning.	Ind. Manag. Data Syst.	2023	DBLP DOI BibTeX RDF
28	Julie Jiang, Jesse Thomason, Francesco Barbieri, Emilio Ferrara	Geolocated Social Media Posts are Happier: Understanding the Characteristics of Check-in Posts on Twitter.	WebSci	2023	DBLP DOI BibTeX RDF
28	Ruosong Yang, Jiannong Cao 0001, Zhiyuan Wen, Jiaxing Shen	Automated post scoring: evaluating posts with topics and quoted posts in online forum.	World Wide Web	2022	DBLP DOI BibTeX RDF
28	Rong-Ping Shen, Dun Liu, Xuan Wei, Mingyue Zhang	Your posts betray you: Detecting influencer-generated sponsored posts by finding the right clues.	Inf. Manag.	2022	DBLP DOI BibTeX RDF
28	Julie Jiang, Jesse Thomason, Francesco Barbieri, Emilio Ferrara	Geolocated Social Media Posts are Happier: Understanding the Characteristics of Check-in Posts on Twitter.	CoRR	2022	DBLP DOI BibTeX RDF
28	Raffael Heiss	How Humorous Posts Influence Engagement With Political Posts on Social Media: The Role of Political Involvement.	J. Media Psychol. Theor. Methods Appl.	2022	DBLP DOI BibTeX RDF
28	Nili Steinfeld, Azi Lev-On	User Engagement with MPs Posts: Examining the characteristics of popular posts by parliamentarians.	EGOV-CeDEM-ePart-*	2022	DBLP BibTeX RDF
28	Ellie Simonson	Semi-Supervised Classification of Social Media Posts: Identifying Sex-Industry Posts to Enable Better Support for Those Experiencing Sex-Trafficking.	CoRR	2021	DBLP BibTeX RDF
28	Siyao Zhou 0001, Jie Li 0054, Haiyan Ding	Fake News and Hostile Posts Detection Using an Ensemble Learning Model.	CONSTRAINT@AAAI	2021	DBLP DOI BibTeX RDF
28	Ashwin Singh, Rudraroop Ray	Identifying Offensive Content in Social Media Posts.	CONSTRAINT@AAAI	2021	DBLP DOI BibTeX RDF
28	Arkadipta De, Venkatesh Elangovan, Kaushal Kumar Maurya, Maunendra Sankar Desarkar	Coarse and Fine-Grained Hostility Detection in Hindi Posts Using Fine Tuned Multilingual Embeddings.	CONSTRAINT@AAAI	2021	DBLP DOI BibTeX RDF
28	Parth Patwa, Mohit Bhardwaj, Vineeth Guptha, Gitanjali Kumari, Shivam Sharma, Srinivas PYKL, Amitava Das, Asif Ekbal, Md. Shad Akhtar, Tanmoy Chakraborty 0002	Overview of CONSTRAINT 2021 Shared Tasks: Detecting English COVID-19 Fake News and Hindi Hostile Posts.	CONSTRAINT@AAAI	2021	DBLP DOI BibTeX RDF
26	Nayer M. Wanas, Motaz Ahmad El-Saban, Heba Ashour, Waleed Ammar	Automatic scoring of online discussion posts.	WICOW	2008	DBLP DOI BibTeX RDF	online communities, content filtering, forums
26	Jiahui Liu, Larry Birnbaum, Bryan Pardo	Categorizing blogger's interests based on short snippets of blog posts.	CIKM	2008	DBLP DOI BibTeX RDF	categorization, interests, blogger
26	Ben He, Craig Macdonald, Iadh Ounis	Ranking opinionated blog posts using OpinionFinder.	SIGIR	2008	DBLP DOI BibTeX RDF	opinion finding, blogs
24		To change the world, take a chance.	Commun. ACM	2011	DBLP DOI BibTeX RDF
24		UX design and agile: a natural fit? (Talking with Julian Gosper, Jean-Luc Agathos, Richard Rutter, and Terry Coatta).	Commun. ACM	2011	DBLP DOI BibTeX RDF
24		In the Virtual Extension.	Commun. ACM	2011	DBLP DOI BibTeX RDF
24	Hyoseop Shin, Jeehoon Lee, Kyouhyun Hwang	Separating the reputation and the sociability of online community users.	SAC	2010	DBLP DOI BibTeX RDF	pure user reputation, user ranking, user reputation, user sociability, online communities
24	Mengqiu Wang	Learning hidden variable models for blog retrieval.	SIGIR	2010	DBLP DOI BibTeX RDF	learning to rank, passage retrieval, blog retrieval
24	Hui Li 0005, Sourav S. Bhowmick, Aixin Sun	Blog cascade affinity: analysis and prediction.	CIKM	2009	DBLP DOI BibTeX RDF	blog cascade, social networks, information flow, network evolution
24	Hsiu-Ju Chen	Bloggers' Social Presence Framing and Blog Visitors' Responses.	ACIS-ICIS	2009	DBLP DOI BibTeX RDF
24	Albert Angel, Nick Koudas, Nikos Sarkas, Divesh Srivastava	What's on the grapevine?	SIGMOD Conference	2009	DBLP DOI BibTeX RDF	text exploration, text mining, blogs, social media
24	Il-Chul Moon, Young-Min Kim, Hyun-Jong Lee, Alice H. Oh	Temporal Issue Trend Identifications in Blogs.	CSE (4)	2009	DBLP DOI BibTeX RDF
24	Craig Macdonald, Iadh Ounis	Key blog distillation: ranking aggregates.	CIKM	2008	DBLP DOI BibTeX RDF	blog distillation, feed search, expert search
24	Ben He, Craig Macdonald, Jiyin He, Iadh Ounis	An effective statistical approach to blog post opinion retrieval.	CIKM	2008	DBLP DOI BibTeX RDF	sentiment, blog, statistics, retrieval, subjectivity, opinion
24	Markus Luetzelschwab, Dominik Weiland, Marc P. Y. Desmulliez	Adaptive Packaging Solution for a Microlens Array Placed Over a Micro-UV-LED Array.	IPAS	2008	DBLP DOI BibTeX RDF
24	Tianjun Fu, Hsinchun Chen	Analysis of cyberactivism: A case study of online free Tibet activities.	ISI	2008	DBLP DOI BibTeX RDF
24	Kentaro Inui, Shuya Abe, Kazuo Hara, Hiraku Morita, Chitose Sao, Megumi Eguchi, Asuka Sumida, Koji Murakami, Suguru Matsuyoshi	Experience Mining: Building a Large-Scale Database of Personal Experiences and Opinions from Web Documents.	Web Intelligence	2008	DBLP DOI BibTeX RDF
24	Akshay Java, Xiaodan Song, Tim Finin, Belle L. Tseng	Why We Twitter: An Analysis of a Microblogging Community.	WebKDD/SNA-KDD	2007	DBLP DOI BibTeX RDF
24	Robert W. Irving, Telikepalli Kavitha, Kurt Mehlhorn, Dimitrios Michail 0001, Katarzyna E. Paluch 0001	Rank-maximal matchings.	ACM Trans. Algorithms	2006	DBLP DOI BibTeX RDF	maximum cardinality matching, one-sided preference lists, Bipartite matching
24	Jaime Arguello, Brian S. Butler, Elisabeth Joyce, Robert E. Kraut, Kimberly S. Ling, Carolyn P. Rosé, Xiaoqing Wang	Talk to me: foundations for successful individual-group interactions in online communities.	CHI	2006	DBLP DOI BibTeX RDF	community success, online communities, language, commitment, text analysis, responsiveness, contribution
24	Lan You, Xuanjing Huang 0001, Lide Wu, Hao Yu 0005, Jun Wang, Fumihito Nishino	Exploring Various Features to Optimize Hot Topic Retrieval on WEB.	ISNN (1)	2004	DBLP DOI BibTeX RDF
24	Wen-tau Yih, Po-Hao Chang, WooYoung Kim	Mining Online Deal Forums for Hot Deals.	Web Intelligence	2004	DBLP DOI BibTeX RDF
14	Murtaza Ali Khan, Mohammed AlGhamdi	A customized deep learning-based framework for classification and analysis of social media posts to enhance the Hajj and Umrah services.	Expert Syst. Appl.	2024	DBLP DOI BibTeX RDF
14	Huimin Han, Muhammad Asif, Emad Mahrous Awwad, Nadia Sarhan, Yazeed Yasin Ghadi, Bo Xu	Innovative deep learning techniques for monitoring aggressive behavior in social media posts.	J. Cloud Comput.	2024	DBLP DOI BibTeX RDF
14	Daniyar Amangeldi, Aida Usmanova, Pakizar Shamoi	Understanding Environmental Posts: Sentiment and Emotion Analysis of Social Media Data.	IEEE Access	2024	DBLP DOI BibTeX RDF
14	Nazzere Oryngozha, Pakizar Shamoi, Ayan Igali	Detection and Analysis of Stress-Related Posts in Reddit's Acamedic Communities.	IEEE Access	2024	DBLP DOI BibTeX RDF
14	Anita Saroj, Sukomal Pal	Ensemble-based domain adaptation on social media posts for irony detection.	Multim. Tools Appl.	2024	DBLP DOI BibTeX RDF
14	Yun Sheng Tsai, Arbee L. P. Chen	Suicide risk assessment using word-level model with dictionary-based risky posts selection.	Multim. Tools Appl.	2024	DBLP DOI BibTeX RDF
14	Blessing Ogbuokiri, Ali Ahmadi, Zahra Movahedi Nia, Bruce Mellado, Jiahong Wu, James Orbinski, Ali Asgary, Jude Dzevela Kong	Vaccine Hesitancy Hotspots in Africa: An Insight From Geotagged Twitter Posts.	IEEE Trans. Comput. Soc. Syst.	2024	DBLP DOI BibTeX RDF
14	Shatadru Roy Chowdhury, Srinka Basu, Ujjwal Maulik	Disastrous Event and Sub-Event Detection From Microblog Posts Using Bi-Clustering Method.	IEEE Trans. Comput. Soc. Syst.	2024	DBLP DOI BibTeX RDF
14	Fatih Gurcan	What are developers talking about information security? A large-scale study using semantic analysis of Q&A posts.	PeerJ Comput. Sci.	2024	DBLP DOI BibTeX RDF
14	Sabakun Naher Shetu	User-generated content and micro-celebrity posts encourage Generation Z consumers to search social media for online purchase: A study on Dhaka City, Bangladesh.	Electron. J. Inf. Syst. Dev. Ctries.	2024	DBLP DOI BibTeX RDF
14	Scott Schanke, Gautam Ray, Gediminas Adomavicius, Mihir Wagle	Content and Style of Firm-Generated Posts on Social Media: A Study of User Engagement on Hedonic and Utilitarian Product Pages on Facebook.	J. Assoc. Inf. Syst.	2024	DBLP BibTeX RDF
14	Gabriele Fariello, Dariusz Jemielniak, Adam Sulkowski	Does Godwin's law (rule of Nazi analogies) apply in observable reality? An empirical study of selected words in 199 million Reddit posts.	New Media Soc.	2024	DBLP DOI BibTeX RDF
14	Daniel Matter, Miriam Schirmer, Nir Grinberg, Jürgen Pfeffer	Close to Human-Level Agreement: Tracing Journeys of Violent Speech in Incel Posts with GPT-4-Enhanced Annotations.	CoRR	2024	DBLP DOI BibTeX RDF
14	Sachin Thukral, Suyash Sangwan, Vipul Chauhan, Arnab Chatterjee, Lipika Dey	Generating insights about financial asks from Reddit posts and user interactions.	CoRR	2024	DBLP DOI BibTeX RDF
14	Menglin Li, Kwan Hui Lim 0001	Leveraging Contrastive Learning for Few-shot Geolocation of Social Posts.	CoRR	2024	DBLP DOI BibTeX RDF
14	Yuchen Wang, Zhengyu Fang, Wei Du, Shuai Xu, Rong Xu, Jing Li	Detection of Opioid Users from Reddit Posts via an Attention-based Bidirectional Recurrent Neural Network.	CoRR	2024	DBLP DOI BibTeX RDF
14	José Alberto Benítez-Andrades, María Teresa García-Ordás, Mayra Russo, Ahmad Sakor, Luis Daniel Fernandes Rotger, Maria-Esther Vidal	Empowering machine learning models with contextual knowledge for enhancing the detection of eating disorders in social media posts.	CoRR	2024	DBLP DOI BibTeX RDF
14	Emily Lin, Jian Sun, Hsingyu Chen, Mohammad H. Mahoor	Data Quality Matters: Suicide Intention Detection on Social Media Posts Using a RoBERTa-CNN Model.	CoRR	2024	DBLP DOI BibTeX RDF
14	Yuya Sasaki 0004, Jing Tao, Yulong Wang	High-Dimensional Tail Index Regression: with An Application to Text Analyses of Viral Posts in Social Media.	CoRR	2024	DBLP DOI BibTeX RDF
14	Fabian Nwaoha, Ziyad Gaffar, Ho Joon Chun, Marina Sokolova	Longitudinal Sentiment Classification of Reddit Posts.	CoRR	2024	DBLP DOI BibTeX RDF
14	Fabian Nwaoha, Ziyad Gaffar, Ho Joon Chun, Marina Sokolova	Longitudinal Sentiment Topic Modelling of Reddit Posts.	CoRR	2024	DBLP DOI BibTeX RDF
14	Gionnieve Lim, Simon T. Perrault	Effects of Automated Misinformation Warning Labels on the Intents to Like, Comment and Share Posts.	CoRR	2024	DBLP DOI BibTeX RDF
14	Junda He, Xin Zhou, Bowen Xu, Ting Zhang, Kisub Kim, Zhou Yang 0003, Ferdian Thung, Ivana Clairine Irsan, David Lo 0001	Representation Learning for Stack Overflow Posts: How Far Are We?	ACM Trans. Softw. Eng. Methodol.	2024	DBLP DOI BibTeX RDF
14	Miikka Kuutila, Carita Kiili, Reijo Kupiainen, Eetu Huusko, Junhao Li, Simo Hosio, Mika Mäntylä, Julie Coiro, Kristian Kiili	Revealing complexities when adult readers engage in the credibility evaluation of social media posts.	Comput. Hum. Behav.	2024	DBLP DOI BibTeX RDF
14	Peipei Liu, Hong Li 0004, Yimo Ren, Jie Liu, Shuaizong Si, Hongsong Zhu, Limin Sun	Hierarchical Aligned Multimodal Learning for NER on Tweet Posts.	AAAI	2024	DBLP DOI BibTeX RDF
14	Danae Sanchez Villegas, Daniel Preotiuc-Pietro, Nikolaos Aletras	Improving Multimodal Classification of Social Media Posts by Leveraging Image-Text Auxiliary Tasks.	EACL (Findings)	2024	DBLP BibTeX RDF
14	Abhishek Gaur, D. K. Yadav	Analyzing Sentiments in Social Media Posts through Hybrid Models.	KST	2024	DBLP DOI BibTeX RDF
14	Amy Ritchart, Rebecca K. Britt	Pro-social framing and sentiment in U.S. broadcast networks' Instagram posts about the COVID-19 vaccine.	HICSS	2024	DBLP BibTeX RDF
14	Chris J. Vargo, Gina M. Masullo, Tobias Hopp	Deciding to Delete Posts on Reddit: What Factors Influence Content Removal.	HICSS	2024	DBLP BibTeX RDF
14	Tom Mattson, Qin Weng, Jie Ren 0009	Curse or Cure: Exploring Responses to Mental Health Related Posts in Reddit and ChatGPT Using Terror Management Theory.	HICSS	2024	DBLP BibTeX RDF
14	Alexander Lill, André N. Meyer, Thomas Fritz 0001	On the Helpfulness of Answering Developer Questions on Discord with Similar Conversations and Posts from the Past.	ICSE	2024	DBLP DOI BibTeX RDF
14	Yusuke Yoshida, Kosuke Takano	A Method for Calculating Degree of Deviation of Posts on Social Media for Public Opinion in Flaming Prediction.	EIDWT	2024	DBLP DOI BibTeX RDF
14	Zhenyu Zhang, JiuDong Yang	HintMiner: Automatic Question Hints Mining From Q&A Web Posts with Language Model via Self-Supervised Learning.	AISTATS	2024	DBLP BibTeX RDF
14	Anastasios Ntourmas, Sophia Daskalaki, Yannis A. Dimitriadis, Nikolaos M. Avouris	Classifying MOOC forum posts using corpora semantic similarities: a study on transferability across different courses.	Neural Comput. Appl.	2023	DBLP DOI BibTeX RDF
14	Mohamed A. El-Rashidy, Ahmed Farouk, Nawal A. El-Fishawy, Heba K. Aslan, Nabila A. Khodeir	New weighted BERT features and multi-CNN models to enhance the performance of MOOC posts classification.	Neural Comput. Appl.	2023	DBLP DOI BibTeX RDF
14	Anastasios Ntourmas, Sophia Daskalaki, Yannis Dimitriadis 0001, Nikolaos M. Avouris	Correction to: Classifying MOOC forum posts using corpora semantic similarities: a study on transferability across different courses.	Neural Comput. Appl.	2023	DBLP DOI BibTeX RDF
14	Veronika Solopova, Oana-Iuliana Popescu, Christoph Benzmüller, Tim Landgraf	Automated Multilingual Detection of Pro-Kremlin Propaganda in Newspapers and Telegram Posts.	Datenbank-Spektrum	2023	DBLP DOI BibTeX RDF