Search results for "FNN"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
102	Chi-Hsu Wang, Jung-Sheng Wen	On the Equivalence of a Table Lookup (TL) Technique and Fuzzy Neural Network (FNN) With Block Pulse Membership Functions (BPMFs) and Its Application to Water Injection Control of an Automobile.	IEEE Trans. Syst. Man Cybern. Part C	2008	DBLP DOI BibTeX RDF
92	Hongru Li, Hailong Li, Yina Du	A Global Optimization Algorithm Based on Novel Interval Analysis for Training Neural Networks.	ISICA	2007	DBLP DOI BibTeX RDF
66	Rong-Jong Wai, Li-Jung Chang	Stabilizing and tracking control of nonlinear dual-axis inverted-pendulum system using fuzzy neural network.	IEEE Trans. Fuzzy Syst.	2006	DBLP DOI BibTeX RDF
66	Lipo Wang, Bing Liu 0014, Chunru Wan	On the Universal Approximation Theorem of Fuzzy Neural Networks with Random Membership Function Parameters.	ISNN (1)	2005	DBLP DOI BibTeX RDF
66	Lipo Wang, Bing Liu 0014, Chunru Wan	A Novel Fuzzy Neural Network with Fast Training and Accurate Generalization.	ISNN (1)	2004	DBLP DOI BibTeX RDF
66	John B. Theocharis, George J. Vachtsevanos	Adaptive Fuzzy Neural Networks as identifiers of discrete-time nonlinear dynamic systems.	J. Intell. Robotic Syst.	1996	DBLP DOI BibTeX RDF	structure/parameter learning, adaptive rule base, fuzzy neural networks
62	A. Singh, Hiok Chai Quek, Siu-Yeung Cho	DCT-Yager FNN: A Novel Yager-Based Fuzzy Neural Network With the Discrete Clustering Technique.	IEEE Trans. Neural Networks	2008	DBLP DOI BibTeX RDF
56	J. L. Su, Yimin Chen, Zhonghui Ouyang	An Image Compression Algorithm with Controllable Compression Rate.	ICFIE	2007	DBLP DOI BibTeX RDF	FNN, compression rate, wavelet transform
52	Rong-Jong Wai, Zhiwei Yang	Adaptive Fuzzy Neural Network Control Design via a T-S Fuzzy Model for a Robot Manipulator Including Actuator Dynamics.	IEEE Trans. Syst. Man Cybern. Part B	2008	DBLP DOI BibTeX RDF
52	Sung-Kwun Oh, Witold Pedrycz	Genetically Optimized Hybrid Fuzzy Neural Networks: Analysis and Design of Rule-based Multi-layer Perceptron Architectures.	Engineering Evolutionary Intelligent Systems	2008	DBLP DOI BibTeX RDF
52	Feng Chu 0002, Wei Xie, Farideh Fazayeli, Lipo Wang	Assisting Cancer Diagnosis with Fuzzy Neural Networks.	Computational Intelligence in Biomedicine and Bioinformatics	2008	DBLP DOI BibTeX RDF
52	Rong-Jong Wai, Chia-Ming Liu	Design of dynamic Petri recurrent-fuzzy-neural-network scheme for mobile robot tracking control.	IJCNN	2008	DBLP DOI BibTeX RDF
52	Abdul Wahab, Geok See Ng, A. Jonatan	Integrated Biometric Verification System Using Soft Computing Approach.	Neural Process. Lett.	2007	DBLP DOI BibTeX RDF	biometric verification, false acceptance, false rejection, fuzzy neural network, fingerprint verification, minutiae
52	Ramazan Gencay, Rajna Gibson	Model Risk for European-Style Stock Index Options.	IEEE Trans. Neural Networks	2007	DBLP DOI BibTeX RDF
52	Liang Zhao, Fei-Yue Wang 0001	Design for self-organizing fuzzy neural networks using a novel hybrid learning algorithm.	IEEE Congress on Evolutionary Computation	2007	DBLP DOI BibTeX RDF
52	Xiaoguang Zhang 0004, Shijin Ren, Xing-gan Zhang, Fan Zhao	Fuzzy Neural Network Classification Design Using Support Vector Machine in Welding Defect.	ISNN (2)	2007	DBLP DOI BibTeX RDF
52	Le Chen, Baoming Ge, Anibal T. de Almeida	Self-tuning PID Temperature Controller Based on Flexible Neural Network.	ISNN (1)	2007	DBLP DOI BibTeX RDF
52	Qiang Song 0001, Fang Liu 0023, Raymond D. Findlay	Improved Fuzzy Neural Network Control for a Pneumatic System Based on Extended Kalman Filter.	CIMCA/IAWTIC	2006	DBLP DOI BibTeX RDF
52	Yuan Kang, Chun-Chieh Wang, Yeon-Pun Chang, Chien-Ching Hsueh, Ming-Chang Chang	Certainty Improvement in Diagnosis of Multiple Faults by Using Versatile Membership Functions for Fuzzy Neural Networks.	ISNN (2)	2006	DBLP DOI BibTeX RDF
52	Yiguang Liu, Zhisheng You	A Concise Functional Neural Network for Computing the Extremum Eigenpairs of Real Symmetric Matrices.	ISNN (1)	2006	DBLP DOI BibTeX RDF
52	Anbang Xu, Ping Guo 0002	Image Registration with Regularized Neural Network.	ICONIP (2)	2006	DBLP DOI BibTeX RDF
52	Baoming Ge, Anibal T. de Almeida, Fernando J. T. E. Ferreira	Torque Control of Switched Reluctance Motors Based on Flexible Neural Network.	ISNN (3)	2005	DBLP DOI BibTeX RDF
52	Liying Ma, Khashayar Khorasani	Adaptive Constructive Neural Networks Using Hermite Polynomials for Image Compression.	ISNN (2)	2005	DBLP DOI BibTeX RDF
52	Sheng-Fu Liang, Chin-Teng Lin, Ruei-Cheng Wu, Teng-Yi Huang, Wen-Hung Chao	Classification of driver's cognitive responses from EEG analysis.	ISCAS (1)	2005	DBLP DOI BibTeX RDF
52	Gang Chen 0033, Weigong Zhang, Zongyang Gong, Wei Sun 0012	Evaluation Model for Vehicle Shift Quality Based on Evidence Theory and FNN.	PACIIA (1)	2008	DBLP DOI BibTeX RDF	Shift quality, FNN, Evaluation, Vehicle, Evidence theory
51	Yanqing Zhang 0008	A Novel FNN Algorithm and Its Application in FCC Evaluation Based on Kirkpatrick Model.	WKDD	2010	DBLP DOI BibTeX RDF	FNN algorithm, financing credit capacity, Kirkpatrick model, comprehensive evaluation
42	J. L. Su, Yimin Chen, Zhonghui Ouyang	GPRS Congestion Control Algorithm Based on Fuzzy Kernel Neural Networks.	ISDA (1)	2006	DBLP DOI BibTeX RDF	FNN, congestion control, wavelet transform, GPRS
39	Paris A. Mastorocostas, Constantinos S. Hilas	A block-diagonal recurrent fuzzy neural network for system identification.	Neural Comput. Appl.	2009	DBLP DOI BibTeX RDF	Block-diagonal recurrent fuzzy-neural network, Internal feedback, Separation of lung sounds, System identification
39	Wei Zuo, Yang Zhu, Lilong Cai	Fourier-Neural-Network-Based Learning Control for a Class of Nonlinear Systems With Flexible Components.	IEEE Trans. Neural Networks	2009	DBLP DOI BibTeX RDF
39	Feipeng Da	Fuzzy neural network sliding mode control for long delay time systems based on fuzzy prediction.	Neural Comput. Appl.	2008	DBLP DOI BibTeX RDF	Long delay time, Fuzzy prediction, Process control, Fuzzy neural network, Sliding mode
39	Leif E. Peterson, Kirill V. Larin	Hermite/Laguerre Neural Networks for Classification of Artificial Fingerprints from Optical Coherence Tomography.	ICMLA	2008	DBLP DOI BibTeX RDF
39	Ching-Hung Lee, Yu-Ching Lin	Type-2 Fuzzy Neuro System Via Input-to-State-Stability Approach.	ISNN (2)	2007	DBLP DOI BibTeX RDF
39	Haruna Matsushita, Yoshifumi Nishio	Self-Organizing Map Considering False Neighboring Neuron.	ISCAS	2007	DBLP DOI BibTeX RDF
39	Jie-Sheng Wang	Rotary Kiln Intelligent Control Based on T-S Fuzzy Neural Network and Rough Sets.	FSKD (2)	2007	DBLP DOI BibTeX RDF
39	Mounir Ben Nasr, Mohamed Chtourou	A Hybrid Training Algorithm for Feedforward Neural Networks.	Neural Process. Lett.	2006	DBLP DOI BibTeX RDF	supervised and unsupervised learning, hybrid training, self-organizing map, feedforward neural network, gradient descent method
39	Puyin Liu, Qiang Luo, Wenqiang Yang, Dongyun Yi	The Learning Algorithm for a Novel Fuzzy Neural Network.	ICIC (1)	2006	DBLP DOI BibTeX RDF
39	Jianghua Sui, Guang Ren	An AND-OR Fuzzy Neural Network Ship Controller Design.	ICONIP (3)	2006	DBLP DOI BibTeX RDF
39	Aydogan Savran	A Multilayer Feedforward Fuzzy Neural Network.	TAINN	2005	DBLP DOI BibTeX RDF
39	Shaoze Yan, Kai Zheng 0010, Yangmin Li 0001	Vibration Suppression of Adaptive Truss Structure Using Fuzzy Neural Network.	ISNN (3)	2005	DBLP DOI BibTeX RDF
39	Marcela Jamett, Gonzalo Acuña	Comparative Assessment of Interval and Affine Arithmetic in Neural Network State Prediction.	ISNN (2)	2005	DBLP DOI BibTeX RDF
39	Hui-Chen Chang, Yau-Tarng Juang	Weight Training for Performance Optimization in Fuzzy Neural Network.	KES (1)	2005	DBLP DOI BibTeX RDF
39	Weimin Ma, Guoqing Chen	Approximation Bound for Fuzzy-Neural Networks with Bell Membership Function.	FSKD (1)	2005	DBLP DOI BibTeX RDF
39	Fang-Ju Ai, Yong Feng	Structural Simplification of a Fuzzy-Neural Network Model.	WSTST	2005	DBLP DOI BibTeX RDF
39	S. R. Samantaray 0001, Pradipta K. Dash, Ganapati Panda, Bijaya K. Panigrahi	Distance Protection of Compensated Transmission Line Using Computational Intelligence.	CIS (1)	2005	DBLP DOI BibTeX RDF
39	Weimin Ma, Guoqing Chen	Improvement on the Approximation Bound for Fuzzy-Neural Networks Clustering Method with Gaussian Membership Function.	ADMA	2005	DBLP DOI BibTeX RDF
39	Yuehui Chen, Bo Yang 0001, Jiwen Dong	Evolving Flexible Neural Networks Using Ant Programming and PSO Algorithm.	ISNN (1)	2004	DBLP DOI BibTeX RDF
39	Kar-Ann Toh, Juwei Lu, Wei-Yun Yau	Global Feedforward Neural Network Learning for Classification and Regression.	EMMCVPR	2001	DBLP DOI BibTeX RDF
39	Seiichi Matsushita, Takeshi Furuhashi, Hiroaki Tsutsui, Yoshiki Uchikawa	Efficient fuzzy modeling and evaluation criteria.	KES (1)	1997	DBLP DOI BibTeX RDF
36	Anbang Xu, Xin Jin, Ping Guo 0002, Rongfang Bie	KICA Feature Extraction in Application to FNN based Image Registration.	IJCNN	2006	DBLP DOI BibTeX RDF
29	Liming Guan, Jian Lin 0004	Study on the Offset Color Reproduction Control System Based on Fuzzy Neural Network.	ISNN (2)	2009	DBLP DOI BibTeX RDF	Offset printing, FNN, Color reproduction, BP algorithm
26	Sun-Jen Huang, Nan-Hsing Chiu	Applying fuzzy neural network to estimate software development effort.	Appl. Intell.	2009	DBLP DOI BibTeX RDF	Fuzzy logic, Artificial neural network, Fuzzy neural network, Software effort estimation
26	Amar Mezache, Faouzi Soltani	A New Approach for Estimating the Parameters of the rmK-Distribution Using Fuzzy-Neural Networks.	IEEE Trans. Signal Process.	2008	DBLP DOI BibTeX RDF
26	Liying Ma, Khashayar Khorasani	An Adaptively Constructing Multilayer Feedforward Neural Networks Using Hermite Polynomials.	ICIC (2)	2008	DBLP DOI BibTeX RDF	Adaptive structure neural networks, Multilayer feedforward neural networks, Hermite polynomials
26	Yujie Liu, Xiaolan Yao, Zongmin Li	SHREC'08 entry: Forward neural network-based 3D model retrieval.	Shape Modeling International	2008	DBLP DOI BibTeX RDF
26	Zhi-jiang Du, Zhong Min Wang	Mobile Robot Path Tracking in Unknown Dynamic Environment.	RAM	2008	DBLP DOI BibTeX RDF
26	Paris A. Mastorocostas	A Block-Diagonal Recurrent Fuzzy Neural Network for Dynamic System Identification.	FUZZ-IEEE	2007	DBLP DOI BibTeX RDF
26	Yuelong Hao, Jinggang Zhang, Zhimei Chen	Adaptive Global Integral Neuro-sliding Mode Control for a Class of Nonlinear System.	ISNN (1)	2007	DBLP DOI BibTeX RDF
26	Lei Sun, Max Q.-H. Meng, Wanming Chen, Huawei Liang, Tao Mei 0003	Design of Quadruped Robot Based Neural Network.	ISNN (1)	2007	DBLP DOI BibTeX RDF
26	Shouwen Fan, Min Sun	Gait Parameters Optimization and Real-Time Trajectory Planning for Humanoid Robots.	ICIC (2)	2007	DBLP DOI BibTeX RDF	Gait Optimization, Energy Consumption Index, Humanoid Robot, Fuzzy Neural network, Trajectory Planning
26	Chin-Teng Lin, Chang-Mao Yeh, Sheng-Fu Liang, Jen-Feng Chung, Nimit Kumar	Support-vector-based fuzzy neural network for pattern classification.	IEEE Trans. Fuzzy Syst.	2006	DBLP DOI BibTeX RDF
26	Faa-Jeng Lin, Po-Hung Shen	Adaptive fuzzy-neural-network control for a DSP-based permanent magnet linear synchronous motor servo drive.	IEEE Trans. Fuzzy Syst.	2006	DBLP DOI BibTeX RDF
26	Enrique Romero, Daniel Toppo	Comparing Support Vector Machines and Feed-forward Neural Networks with Similar Parameters.	IDEAL	2006	DBLP DOI BibTeX RDF
26	Sung-Kwun Oh, Byoung-Jun Park, Witold Pedrycz	Design of Fuzzy Neural Networks Based on Genetic Fuzzy Granulation and Regression Polynomial Fuzzy Inference.	ISNN (1)	2006	DBLP DOI BibTeX RDF
26	Lihua Xue, Hong-Zhong Huang, Jun Hu, Qiang Miao, Dan Ling	RAOGA-Based Fuzzy Neural Network Model of Design Evaluation.	ICIC (2)	2006	DBLP DOI BibTeX RDF
26	Weimin Ma	Approximation Accuracy of Table Look-Up Scheme for Fuzzy-Neural Networks with Bell Membership Function.	ICONIP (3)	2006	DBLP DOI BibTeX RDF
26	Mamoun S. Al Rababaa	Structural Models and Topology Design of Rapid Neural Networks.	CGIV	2005	DBLP DOI BibTeX RDF	rapid algorithm, partial reflection, neural networks, network topology, substitution, structural model
26	Sung-Kwun Oh, Witold Pedrycz, Hyun-Ki Kim, Yong-Kab Kim	Genetically Optimized Hybrid Fuzzy Neural Networks with the Aid of TSK Fuzzy Inference Rules and Polynomial Neural Networks.	IWANN	2005	DBLP DOI BibTeX RDF
26	Sung-Kwun Oh, Byoung-Jun Park, Witold Pedrycz, Hyun-Ki Kim	Genetically Optimized Hybrid Fuzzy Neural Networks in Modeling Software Data.	MDAI	2005	DBLP DOI BibTeX RDF
26	Jun Wang 0013, Hong Peng 0001, Xiao Jian	Position Control for PM Synchronous Motor Using Fuzzy Neural Network.	ISNN (3)	2005	DBLP DOI BibTeX RDF
26	Shuyuan Yang, Min Wang 0007, Licheng Jiao	A New Adaptive Ridgelet Neural Network.	ISNN (1)	2005	DBLP DOI BibTeX RDF
26	Sung-Kwun Oh, Byoung-Jun Park, Hyun-Ki Kim	Genetically Optimized Hybrid Fuzzy Neural Networks Based on TSK Fuzzy Rules and Polynomial Neurons.	ISNN (1)	2005	DBLP DOI BibTeX RDF
26	Hui-Chen Chang, Yau-Tarng Juang	Use of Fuzzy Neural Networks with Grey Relations in Fuzzy Rules Partition Optimization.	ICNC (3)	2005	DBLP DOI BibTeX RDF
26	Samy F. M. Assal, Keigo Watanabe, Kiyotaka Izumi	Cooperative Fuzzy Hint Acquisition for Industrial Redundant Robots to Avoid the Joint Limits.	WSTST	2005	DBLP DOI BibTeX RDF
26	Guiling Zhang, Jizhou Sun	Applying Fuzzy Neural Network to Intrusion Detection Based on Sequences of System Calls.	ADMA	2005	DBLP DOI BibTeX RDF
26	Dongmei Huang, Minghu Ha 0001, Ya-min Li, Eric C. C. Tsang	Refinement of Fuzzy Production Rules by Using a Fuzzy-Neural Approach.	ICMLC	2005	DBLP DOI BibTeX RDF
26	Abdul Wahab, Eng Chong Tan, A. Jonatan	Direct Gray-Scale Minutiae Extraction.	ICBA	2004	DBLP DOI BibTeX RDF
26	Byoung-Jun Park, Sung-Kwun Oh, Witold Pedrycz, Tae-Chon Ahn	Information Granulation-Based Multi-layer Hybrid Fuzzy Neural Networks: Analysis and Design.	International Conference on Computational Science	2004	DBLP DOI BibTeX RDF
26	Kah Phooi Seng, Kai-Ming Tse	Nonlinear Time Series Prediction Based on Lyapunov Theory-Based Fuzzy Neural Network and Multiobjective Genetic Algorithm.	Australian Conference on Artificial Intelligence	2003	DBLP DOI BibTeX RDF
26	Henry G. Dietz, Timothy Mattox	Compiler Techniques for Flat Neighborhood Networks.	LCPC	2000	DBLP DOI BibTeX RDF
26	Youmin Zhang 0001, X. Rong Li	A fast U-D factorization-based learning algorithm with applications to nonlinear system modeling and identification.	IEEE Trans. Neural Networks	1999	DBLP DOI BibTeX RDF
26	Tao Zhang, Dongcheng Hu, Shiyuan Yang	Fault-Tolerant Analysis of Feedback Neural Networks with Threshold Neurons.	Asian Test Symposium	1999	DBLP DOI BibTeX RDF	Feedback Neural Networks, Fault-tolerant Analysis, Central Limit Theorem
26	Wael A. Farag, Victor H. Quintana, Germano Lambert-Torres	A genetic-based neuro-fuzzy approach for modeling and control of dynamical systems.	IEEE Trans. Neural Networks	1998	DBLP DOI BibTeX RDF
26	Steffen Hölldobler, Yvonne Kalinke, Hans-Peter Störr	Recurrent Neural Networks to Approximate the Semantics of Acceptable Logic Programs.	Australian Joint Conference on Artificial Intelligence	1998	DBLP DOI BibTeX RDF
26	Takayuki Tanaka, Junji Ohwi, Ludmila V. Litvintseva, Kazuo Yamafuji, Sergei V. Ulyanov	Soft computing algorithms for intelligent control of a mobile robot for service use: Part 2: Path planning, navigation and technology operations.	Soft Comput.	1997	DBLP DOI BibTeX RDF	Mo bile robot for service use, technology operations, navigation, soft computing, intelligent control
23	Surya Narayan Tripathy, Shubhasri Kundu, Arjyadhara Pradhan, Padarbinda Samal	Design of BLDC Motor Using African Vulture Optimization Algorithm Based Trained FNN.	SN Comput. Sci.	2024	DBLP DOI BibTeX RDF
23	Marinos Vlachos, Dimitrios Skarlatos 0001	Self-Adaptive Colour Calibration of Deep Underwater Images Using FNN and SfM-MVS-Generated Depth Maps.	Remote. Sens.	2024	DBLP DOI BibTeX RDF
23	Rajesh Chatterjee, Mohammad Amir Khusru Akhtar, Dinesh Kumar Pradhan, Falguni Chakraborty, Mohit Kumar, Sahil Verma, Ruba Abu Khurma, Maribel García Arenas	FNN for Diabetic Prediction Using Oppositional Whale Optimization Algorithm.	IEEE Access	2024	DBLP DOI BibTeX RDF
23	Xujing Yao, Ziquan Zhu, Cheng Kang, Shui-Hua Wang, Juan Manuel Górriz, Yu-Dong Zhang 0001	AdaD-FNN for Chest CT-Based COVID-19 Diagnosis.	IEEE Trans. Emerg. Top. Comput. Intell.	2023	DBLP DOI BibTeX RDF
23	Jiahui Wang, Yabin Gao, Yue Zhao 0004, Zhiguang Feng, Jianxing Liu	A comparative study of FNN-based dynamic sliding mode control for DC-DC converters.	Int. J. Circuit Theory Appl.	2023	DBLP DOI BibTeX RDF
23	Yihao Zhang, Zeming Wei, Xiyue Zhang, Meng Sun 0002	Using Z3 for Formal Modeling and Verification of FNN Global Robustness.	CoRR	2023	DBLP DOI BibTeX RDF
23	Ghulam Mustafa, Seong-je Cho, Youngsup Hwang	TrafficNet: A Hybrid CNN-FNN Model for Analysis of Traffic Accidents in Seoul.	J. Comput. Sci. Eng.	2023	DBLP DOI BibTeX RDF
23	Shivanand V. Manjaragi, S. V. Saboji	Fast user authentication in 5G heterogeneous networks using RLAC-FNN and blockchain technology for handoff delay reduction.	Wirel. Networks	2023	DBLP DOI BibTeX RDF
23	Muhammad Alifsyah Putra Nasution, Dimitri Mahayana, Pranoto Hidaya Rusmin, Hasan Zidni	Comparison of Stochastic Steepest Gradient Descent and Extended Kalman Filter as ARMA-FNN Learning Algorithms for Data-Driven System Identification of Batch Distillation Column.	ICSET	2023	DBLP DOI BibTeX RDF
23	Yihao Zhang, Zeming Wei, Xiyue Zhang, Meng Sun 0002	Using Z3 for Formal Modeling and Verification of FNN Global Robustness (S).	SEKE	2023	DBLP DOI BibTeX RDF
23	Yimin Sun, Xiaobo Zhang, Zhehao Zhang, Yunyang Wu, Haihao Tang, Haonan Luo	ABF-FNN: A new fuzzy neural network for predicting coal mine gas concentration hazard.	IEEE Big Data	2023	DBLP DOI BibTeX RDF
23	Hairui Wang, Yanbo Chen, Huilong Yu, Junqiang Xi	Social Cascade FNN: An Interpretable Learning-Based Decision-Making Framework for Autonomous Driving in Lane Changing Scenarios.	ITSC	2023	DBLP DOI BibTeX RDF
23	Degan Zhang 0001, Peng Yang, Jie Chen 0075, Xiao-dan Zhang, Ting Zhang 0009	Novel FNN-based machine deep learning approach for image aggregation in application of the IoT.	J. Exp. Theor. Artif. Intell.	2022	DBLP DOI BibTeX RDF
23	Hang Zhao, Jianjie Chu, Rong Mo, Chen Chen, Ning Ding	Passenger comfort evaluation of the stowing and unloading luggage task in high-speed trains: Fusion of R-DEMATEL and FNN.	J. Intell. Fuzzy Syst.	2022	DBLP DOI BibTeX RDF
23	Sarthika Dutt, Neelu Jyothi Ahuja, Manoj Kumar 0009	An intelligent tutoring system architecture based on fuzzy neural network (FNN) for special education of learning disabled learners.	Educ. Inf. Technol.	2022	DBLP DOI BibTeX RDF
23	Chuhan Xu, Pablo Coen-Pirani, Xia Jiang	Empirical Study of Overfitting in Deep FNN Prediction Models for Breast Cancer Metastasis.	CoRR	2022	DBLP DOI BibTeX RDF