Search results for "condensation"

Hits ?▲	Authors	Title	Venue	Year	Link
17	Qingtang Ding, Zhengyu Liang, Longguang Wang, Yingqian Wang 0002, Jungang Yang 0001	Not All Patches Are Equal: Hierarchical Dataset Condensation for Single Image Super-Resolution.	IEEE Signal Process. Lett.	2023	DBLP DOI BibTeX RDF
17	Mengxian Yu, Yajuan Shi, Qingzhu Jia, Qiang Wang, Zheng-Hong Luo, Fangyou Yan, Yin-Ning Zhou	Ring Repeating Unit: An Upgraded Structure Representation of Linear Condensation Polymers for Property Prediction.	J. Chem. Inf. Model.	2023	DBLP DOI BibTeX RDF
17	Alexandre Mouton, Thomas Rey	On deterministic numerical methods for the quantum Boltzmann-Nordheim equation. I. Spectrally accurate approximations, Bose-Einstein condensation, Fermi-Dirac saturation.	J. Comput. Phys.	2023	DBLP DOI BibTeX RDF
17	Jose R. Martínez-García, Ramón René Palacio Cinco, Francisco Edgar Castillo-Barrera, Juan Carlos Cuevas-Tello, Gilberto Borrego	Knowledge Condensation Model to Support Expertise Location in Software Development.	Computación y Sistemas (CyS)	2023	DBLP BibTeX RDF
17	Heming Jia, Fangkai You, Di Wu, Honghua Rao, Hangqu Wu, Laith Abualigah	Improved snow ablation optimizer with heat transfer and condensation strategy for global optimization problem.	J. Comput. Des. Eng.	2023	DBLP DOI BibTeX RDF
17	Joachim Kerner, Maximilian Pechmann	Bose-Einstein condensation for particles with repulsive short-range pair interactions in a Poisson random external potential in.	J. Appl. Probab.	2023	DBLP DOI BibTeX RDF
17	Mika Göös, Ilan Newman, Artur Riazanov, Dmitry Sokolov 0001	Hardness Condensation by Restriction.	Electron. Colloquium Comput. Complex.	2023	DBLP BibTeX RDF
17	J. Robles, Gilberto Borrego, Ramon R. Palacio, Francisco Edgar Castillo-Barrera	Supporting the Architectural Knowledge Condensation in a Co-Localized Agile Environment for Small Entities Using an Ontology.	Program. Comput. Softw.	2023	DBLP DOI BibTeX RDF
17	Allan Sly, Youngtak Sohn	Local geometry of NAE-SAT solutions in the condensation regime.	CoRR	2023	DBLP DOI BibTeX RDF
17	Xin Zheng, Miao Zhang, Chunyang Chen, Quoc Viet Hung Nguyen, Xingquan Zhu 0001, Shirui Pan	Structure-free Graph Condensation: From Large-scale Graphs to Condensed Graph-free Data.	CoRR	2023	DBLP DOI BibTeX RDF
17	Shitong Shao, Zeyuan Yin, Muxin Zhou, Xindong Zhang, Zhiqiang Shen	Generalized Large-Scale Data Condensation via Various Backbone and Statistical Matching.	CoRR	2023	DBLP DOI BibTeX RDF
17	Jinghan Jia, Yihua Zhang, Dogyoon Song, Sijia Liu 0001, Alfred O. Hero III	Robustness-preserving Lifelong Learning via Dataset Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Lin Wang, Wenqi Fan, Jiatong Li, Yao Ma 0001, Qing Li 0001	Fast Graph Condensation with Structure-based Neural Tangent Kernel.	CoRR	2023	DBLP DOI BibTeX RDF
17	Mira Anna Gergácz, Akos Kereszturi	Surveying the ice condensation period at southern polar Mars using a CNN.	CoRR	2023	DBLP DOI BibTeX RDF
17	Zhangchen Zhou, Hanxu Zhou, Yuqing Li, Zhi-Qin John Xu	Understanding the Initial Condensation of Convolutional Neural Networks.	CoRR	2023	DBLP DOI BibTeX RDF
17	David Junhao Zhang, Heng Wang, Chuhui Xue, Rui Yan, Wenqing Zhang, Song Bai, Mike Zheng Shou	Dataset Condensation via Generative Model.	CoRR	2023	DBLP DOI BibTeX RDF
17	Jiahao Wu 0004, Wenqi Fan, Shengcai Liu, Qijiong Liu, Rui He, Qing Li 0001, Ke Tang 0001	Dataset Condensation for Recommendation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Yilun Liu 0005, Ruihong Qiu, Yanran Tang, Hongzhi Yin, Zi Huang	PUMA: Efficient Continual Graph Learning with Graph Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Ganlong Zhao, Guanbin Li, Yipeng Qin, Yizhou Yu	Improved Distribution Matching for Dataset Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Hansong Zhang 0003, Shikun Li, Pengju Wang, Dan Zeng 0001, Shiming Ge	M3D: Dataset Condensation by Minimizing Maximum Mean Discrepancy.	CoRR	2023	DBLP DOI BibTeX RDF
17	Kun-Peng Ning, Ming Pang, Zheng Fang, Xue Jiang, Xi-Wei Zhao, Changping Peng, Zhangang Lin, Jinghe Hu, Jingping Shao	Towards Better Query Classification with Multi-Expert Knowledge Condensation in JD Ads Search.	CoRR	2023	DBLP DOI BibTeX RDF
17	Xinyi Gao, Tong Chen 0005, Yilong Zang, Wentao Zhang, Quoc Viet Hung Nguyen, Kai Zheng 0001, Hongzhi Yin	Graph Condensation for Inductive Node Representation Learning.	CoRR	2023	DBLP DOI BibTeX RDF
17	Shaohan Sha, Yafeng Sun	DCFL: Non-IID awareness Data Condensation aided Federated Learning.	CoRR	2023	DBLP DOI BibTeX RDF
17	Zeyuan Yin, Eric P. Xing, Zhiqiang Shen	Squeeze, Recover and Relabel: Dataset Condensation at ImageNet Scale From A New Perspective.	CoRR	2023	DBLP DOI BibTeX RDF
17	Haizhong Zheng, Jiachen Sun, Shutong Wu, Bhavya Kailkhura, Zhuoqing Mao, Chaowei Xiao, Atul Prakash 0001	Leveraging Hierarchical Feature Sharing for Efficient Dataset Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Sabine Hittmeir, Philip L. Lederer, Joachim Schöberl, Henry von Wahl	A discontinuous Galerkin approach for atmospheric flows with implicit condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Kilian Lieret, Gage DeZoort, Devdoot Chatterjee, Jian Park, Siqi Miao 0001, Pan Li	High Pileup Particle Tracking with Object Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Seungjae Shin, HeeSun Bae, DongHyeok Shin, Weonyoung Joo, Il-Chul Moon	Loss-Curvature Matching for Dataset Selection and Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Zhengan Chen, Yuqing Li, Tao Luo 0012, Zhangchen Zhou, Zhi-Qin John Xu	Phase Diagram of Initial Condensation for Two-layer Neural Networks.	CoRR	2023	DBLP DOI BibTeX RDF
17	Yujiang Wang 0001, Anshul Thakur, Mingzhi Dong, Pingchuan Ma 0001, Stavros Petridis, Li Shang, Tingting Zhu 0001, David A. Clifton	Is dataset condensation a silver bullet for healthcare data sharing?	CoRR	2023	DBLP DOI BibTeX RDF
17	Shaobo Wang, Xiangdong Zhang, Junchi Yan	Unified Batch Normalization: Identifying and Alleviating the Feature Condensation in Batch Normalization and a Unified Framework.	CoRR	2023	DBLP DOI BibTeX RDF
17	Yilun Liu 0005, Ruihong Qiu, Zi Huang	CaT: Balanced Continual Graph Learning with Graph Condensation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Yang Liu, Deyu Bo, Chuan Shi	Graph Condensation via Eigenbasis Matching.	CoRR	2023	DBLP DOI BibTeX RDF
17	Xinglin Li, Kun Wang, Hanhui Deng, Yuxuan Liang, Di Wu	Attend Who is Weak: Enhancing Graph Condensation via Cross-Free Adversarial Training.	CoRR	2023	DBLP DOI BibTeX RDF
17	Jiahao Wu 0004, Qijiong Liu, Hengchang Hu, Wenqi Fan, Shengcai Liu, Qing Li 0001, Xiao-Ming Wu 0003, Ke Tang 0001	Leveraging Large Language Models (LLMs) to Empower Training-Free Dataset Condensation for Content-Based Recommendation.	CoRR	2023	DBLP DOI BibTeX RDF
17	Dmitry M. Makarov, Michail M. Lukanov, Aleksey I. Rusanov, Nugzar Zh. Mamardashvili, Alexander A. Ksenofontov	Machine learning approach for predicting the yield of pyrroles and dipyrromethanes condensation reactions with aldehydes.	J. Comput. Sci.	2023	DBLP DOI BibTeX RDF
17	Jian Gao, Jianshe Wu	Multiple sparse graphs condensation.	Knowl. Based Syst.	2023	DBLP DOI BibTeX RDF
17	Wenhao Yuan 0004, Xiaoyan Lu, Rongfen Zhang, Yuhong Liu	FCKDNet: A Feature Condensation Knowledge Distillation Network for Semantic Segmentation.	Entropy	2023	DBLP DOI BibTeX RDF
17	Ignacio Reyes-Ayala, Marcos Miotti, Michal Hemmerling, Romain Dubessy, Hélène Perrin, Víctor Romero-Rochín, Vanderlei Salvador Bagnato	Carnot Cycles in a Harmonically Confined Ultracold Gas across Bose-Einstein Condensation.	Entropy	2023	DBLP DOI BibTeX RDF
17	Zhiheng Ma, Dezheng Gao, Shaolei Yang, Xing Wei, Yihong Gong	Dataset Condensation via Expert Subspace Projection.	Sensors	2023	DBLP DOI BibTeX RDF
17	Manfred Linke, Ulrike Praeger, Daniel A. Neuwald, Martin Geyer	Measurement of Water Vapor Condensation on Apple Surfaces during Controlled Atmosphere Storage.	Sensors	2023	DBLP DOI BibTeX RDF
17	Subin Hwa, Eun-Seon Sim, Jun-Hee Na, Ik-Hoon Jang, Jin-Hyuk Kwon, Min-Hoi Kim	A Dew-Condensation Sensor Exploiting Local Variations in the Relative Refractive Index on the Dew-Friendly Surface of a Waveguide.	Sensors	2023	DBLP DOI BibTeX RDF
17	Hamed Mohebalizadeh, Hojatollah Adibi, Mehdi Dehghan 0002	Well-posedness of space fractional Ginzburg-Landau equations involving the fractional Laplacian arising in a Bose-Einstein condensation and its kernel based approximation.	Commun. Nonlinear Sci. Numer. Simul.	2023	DBLP DOI BibTeX RDF
17	Zhe Chen 0013, Jing Zhang 0037, Yufei Xu, Dacheng Tao	Transformer-Based Context Condensation for Boosting Feature Pyramids in Object Detection.	Int. J. Comput. Vis.	2023	DBLP DOI BibTeX RDF
17	Lina Wang, Jiayang Liu, Yang Liu 0040, Weihua Gui 0001	Pinning Stabilizer Design for Probabilistic Boolean Control Networks via Condensation Digraph.	IEEE Trans. Neural Networks Learn. Syst.	2023	DBLP DOI BibTeX RDF
17	Anubhav Sharma, Sagar Joshi, Tushar Abhishek, Radhika Mamidi, Vasudeva Varma	Billy-Batson at SemEval-2023 Task 5: An Information Condensation based System for Clickbait Spoiling.	SemEval@ACL	2023	DBLP DOI BibTeX RDF
17	Yilun Liu 0005, Ruihong Qiu, Zi Huang	CaT: Balanced Continual Graph Learning with Graph Condensation.	ICDM	2023	DBLP DOI BibTeX RDF
17	Tianhang Zheng, Baochun Li	RDM-DC: Poisoning Resilient Dataset Condensation with Robust Distribution Matching.	UAI	2023	DBLP BibTeX RDF
17	Jinghan Jia, Yihua Zhang, Dogyoon Song, Sijia Liu 0001, Alfred O. Hero III	Robustness-Preserving Lifelong Learning Via Dataset Condensation.	ICASSP	2023	DBLP DOI BibTeX RDF
17	Fan Hong, Hanjiang Hong, Yin Xu 0001, Liangyuan Zhao, Yiyan Wu 0001, XiaoWu Ou, Dazhi He, Wenjun Zhang 0001	Condensation Symbol-Level MIMO Precoding for Non-Uniform Constellation in ITCN.	BMSB	2023	DBLP DOI BibTeX RDF
17	Songhua Liu, Jingwen Ye, Runpeng Yu, Xinchao Wang	Slimmable Dataset Condensation.	CVPR	2023	DBLP DOI BibTeX RDF
17	Ganlong Zhao, Guanbin Li, Yipeng Qin, Yizhou Yu	Improved Distribution Matching for Dataset Condensation.	CVPR	2023	DBLP DOI BibTeX RDF
17	Zeyuan Yin, Eric P. Xing, Zhiqiang Shen	Squeeze, Recover and Relabel: Dataset Condensation at ImageNet Scale From A New Perspective.	NeurIPS	2023	DBLP BibTeX RDF
17	Xin Zheng, Miao Zhang, Chunyang Chen, Quoc Viet Hung Nguyen, Xingquan Zhu 0001, Shirui Pan	Structure-free Graph Condensation: From Large-scale Graphs to Condensed Graph-free Data.	NeurIPS	2023	DBLP BibTeX RDF
17	Enneng Yang, Li Shen, Zhenyi Wang, Tongliang Liu, Guibing Guo	An Efficient Dataset Condensation Plugin and Its Application to Continual Learning.	NeurIPS	2023	DBLP BibTeX RDF
17	Bo Zhao, Hakan Bilen	Dataset Condensation with Distribution Matching.	WACV	2023	DBLP DOI BibTeX RDF
17	Ping Liu 0004, Xin Yu, Joey Tianyi Zhou	Meta Knowledge Condensation for Federated Learning.	ICLR	2023	DBLP BibTeX RDF
17	Seungjae Shin, HeeSun Bae, DongHyeok Shin, Weonyoung Joo, Il-Chul Moon	Loss-Curvature Matching for Dataset Selection and Condensation.	AISTATS	2023	DBLP BibTeX RDF
17	Zixuan Jiang, Jiaqi Gu, Mingjie Liu, David Z. Pan	Delving into Effective Gradient Matching for Dataset Condensation.	COINS	2023	DBLP DOI BibTeX RDF
17	Hongyuan Li, Rensheng Chen, Chuntan Han, Yong Yang	Evaluation of the Spatial and Temporal Variations of Condensation and Desublimation over the Qinghai-Tibet Plateau Based on Penman Model Using Hourly ERA5-Land and ERA5 Reanalysis Datasets.	Remote. Sens.	2022	DBLP DOI BibTeX RDF
17	Andrei Yu. Khrennikov	Social Fröhlich condensation: preserving societal order through sufficiently intensive information pumping.	Kybernetes	2022	DBLP DOI BibTeX RDF
17	Se-Jun Park, In-Bok Lee, Sang-Yeon Lee, Jun-Gyu Kim, Jeonghwa Cho, Cristina Decano-Valentin, Young-Bae Choi, Min-Hyung Lee, Hyo-Hyeog Jeong, Uk-Hyeon Yeo, Woo-Sug Jung, Deuk-Young Jeong	Air Conditioning System Design to Reduce Condensation in an Underground Utility Tunnel Using CFD.	IEEE Access	2022	DBLP DOI BibTeX RDF
17	Cheng Xu 0003, Hang Wu, Shihong Duan	Constrained Gaussian Condensation Filter for Cooperative Target Tracking.	IEEE Internet Things J.	2022	DBLP DOI BibTeX RDF
17	Andrei Yu. Khrennikov	Order stability via Fröhlich condensation in bio, eco, and social systems: The quantum-like approach.	Biosyst.	2022	DBLP DOI BibTeX RDF
17	Uttam Kumar Kar, Sayantan Sengupta, Shantanu Pramanik, Soumik Chakraborty	An analytical theory for the forced convection condensation of shear-thinning fluids onto isothermal horizontal surfaces.	Appl. Math. Comput.	2022	DBLP DOI BibTeX RDF
17	Du Dinh-Cong, Tam T. Truong, Trung Nguyen-Thoi	A comparative study of different dynamic condensation techniques applied to multi-damage identification of FGM and FG-CNTRC plates.	Eng. Comput.	2022	DBLP DOI BibTeX RDF
17	Saehyung Lee, Sanghyuk Chun, Sangwon Jung, Sangdoo Yun, Sungroh Yoon	Dataset Condensation with Contrastive Signals.	CoRR	2022	DBLP BibTeX RDF
17	Ping Liu 0004, Xin Yu, Joey Tianyi Zhou	Meta Knowledge Condensation for Federated Learning.	CoRR	2022	DBLP DOI BibTeX RDF
17	Jang-Hyun Kim, Jinuk Kim, Seong Joon Oh, Sangdoo Yun, Hwanjun Song, Joonhyun Jeong, Jung-Woo Ha 0001, Hyun Oh Song	Dataset Condensation via Efficient Synthetic-Data Parameterization.	CoRR	2022	DBLP DOI BibTeX RDF
17	Mengyang Liu, Shanchuan Li, Xinshi Chen, Le Song	Graph Condensation via Receptive Field Distribution Matching.	CoRR	2022	DBLP DOI BibTeX RDF
17	Tian Dong, Bo Zhao, Lingjuan Lyu	Privacy for Free: How does Dataset Condensation Help Privacy?	CoRR	2022	DBLP DOI BibTeX RDF
17	Nicholas Carlini, Vitaly Feldman, Milad Nasr	No Free Lunch in "Privacy for Free: How does Dataset Condensation Help Privacy".	CoRR	2022	DBLP DOI BibTeX RDF
17	Chenxin Li, Mingbao Lin, Zhiyuan Ding, Nie Lin, Yihong Zhuang, Yue Huang 0001, Xinghao Ding, Liujuan Cao	Knowledge Condensation Distillation.	CoRR	2022	DBLP DOI BibTeX RDF
17	Zixuan Jiang, Jiaqi Gu, Mingjie Liu, David Z. Pan	Delving into Effective Gradient Matching for Dataset Condensation.	CoRR	2022	DBLP DOI BibTeX RDF
17	Nicholas J. Weidner, Theodore Kim, Shinjiro Sueda	Condensation Jacobian with Adaptivity.	CoRR	2022	DBLP BibTeX RDF
17	Mattia Sangermano, Antonio Carta, Andrea Cossu, Davide Bacciu	Sample Condensation in Online Continual Learning.	CoRR	2022	DBLP DOI BibTeX RDF
17	Hae Beom Lee, Dong Bok Lee, Sung Ju Hwang	Dataset Condensation with Latent Space Knowledge Factorization and Sharing.	CoRR	2022	DBLP DOI BibTeX RDF
17	Zhe Chen 0013, Jing Zhang 0037, Yufei Xu, Dacheng Tao	Transformer-based Context Condensation for Boosting Feature Pyramids in Object Detection.	CoRR	2022	DBLP DOI BibTeX RDF
17	Justin Cui, Ruochen Wang, Si Si, Cho-Jui Hsieh	DC-BENCH: Dataset Condensation Benchmark.	CoRR	2022	DBLP DOI BibTeX RDF
17	Seong-Woong Kim, Dong-Wan Choi	Stable Federated Learning with Dataset Condensation.	J. Comput. Sci. Eng.	2022	DBLP DOI BibTeX RDF
17	Chin-Shyurng Fahn, Chang-Yi Kao, Meng-Luen Wu, Hao-En Chueh	SOINN-Based Abnormal Trajectory Detection for Efficient Video Condensation.	Comput. Syst. Sci. Eng.	2022	DBLP DOI BibTeX RDF
17	Santi Prestipino, Gabriele Costa 0002	Condensation and Crystal Nucleation in a Lattice Gas with a Realistic Phase Diagram.	Entropy	2022	DBLP DOI BibTeX RDF
17	Caroline Desgranges, Jerome Delhommelle	Machine-Learned Free Energy Surfaces for Capillary Condensation and Evaporation in Mesopores.	Entropy	2022	DBLP DOI BibTeX RDF
17	Shiwei Wang, Chao Wang 0019, Hongbing Ding, Zhengqi Chen, Jiamin Ye	Influence of Operation Conditions on Condensation and Aerodynamic Shockwave in Supersonic Nozzle.	I2MTC	2022	DBLP DOI BibTeX RDF
17	Pengyu Wang, Zhong Chen	Vapor Condensation Under Electric Field: A Study Using Molecular Dynamics Simulation.	SCFA	2022	DBLP DOI BibTeX RDF
17	Rajesh Chitnis	Refined Lower Bounds for Nearest Neighbor Condensation.	ALT	2022	DBLP BibTeX RDF
17	Roberto Labadie Tamayo, Daniel Castro-Castro	Graph-Based Profile Condensation for Users Profiling.	CLEF (Working Notes)	2022	DBLP BibTeX RDF
17	Justin Cui, Ruochen Wang, Si Si, Cho-Jui Hsieh	DC-BENCH: Dataset Condensation Benchmark.	NeurIPS	2022	DBLP BibTeX RDF
17	Hanxu Zhou, Qixuan Zhou, Tao Luo 0012, Yaoyu Zhang, Zhi-Qin John Xu	Towards Understanding the Condensation of Neural Networks at Initial Training.	NeurIPS	2022	DBLP BibTeX RDF
17	Mattia Sangermano, Antonio Carta, Andrea Cossu, Davide Bacciu	Sample Condensation in Online Continual Learning.	IJCNN	2022	DBLP DOI BibTeX RDF
17	Chenxin Li, Mingbao Lin, Zhiyuan Ding, Nie Lin, Yihong Zhuang, Yue Huang 0001, Xinghao Ding, Liujuan Cao	Knowledge Condensation Distillation.	ECCV (11)	2022	DBLP DOI BibTeX RDF
17	Wei Jin 0009, Lingxiao Zhao, Shichang Zhang, Yozen Liu, Jiliang Tang, Neil Shah	Graph Condensation for Graph Neural Networks.	ICLR	2022	DBLP BibTeX RDF
17	Jang-Hyun Kim, Jinuk Kim, Seong Joon Oh, Sangdoo Yun, Hwanjun Song, Joonhyun Jeong, Jung-Woo Ha 0001, Hyun Oh Song	Dataset Condensation via Efficient Synthetic-Data Parameterization.	ICML	2022	DBLP BibTeX RDF
17	Tian Dong, Bo Zhao, Lingjuan Lyu	Privacy for Free: How does Dataset Condensation Help Privacy?	ICML	2022	DBLP BibTeX RDF
17	Saehyung Lee, Sanghyuk Chun, Sangwon Jung, Sangdoo Yun, Sungroh Yoon	Dataset Condensation with Contrastive Signals.	ICML	2022	DBLP BibTeX RDF
17	Kwang-il Hwang, Young-Sik Jeong, Jeakyung Han	Indoor condensation prediction based on a surface temperature estimation.	Int. J. Commun. Syst.	2021	DBLP DOI BibTeX RDF
17	Alexander A. Osipov, Brigitte Hiller, Alex H. Blin, Marcos Sampaio	Top-Bottom Condensation Model: Symmetries and Spectrum of the Induced 2HDM.	Symmetry	2021	DBLP DOI BibTeX RDF
17	Run Cheng, Qian-Yi Wang, Yong-Long Wang, Hong-Shi Zong	Finite-Size Effects with Boundary Conditions on Bose-Einstein Condensation.	Symmetry	2021	DBLP DOI BibTeX RDF
17	Alejandro Flores-Velazco, David M. Mount	Guarantees on nearest-neighbor condensation heuristics.	Comput. Geom.	2021	DBLP DOI BibTeX RDF
17	Tse-Wei Chen 0001, Motoki Yoshinaga, Hongxing Gao, Wei Tao 0001, Dongchao Wen, Junjie Liu, Kinya Osa, Masami Kato	Condensation-Net: Memory-Efficient Network Architecture with Cross-Channel Pooling Layers and Virtual Feature Maps.	CoRR	2021	DBLP BibTeX RDF