Search results for "conducting"

Hits ?▲	Authors	Title	Venue	Year	Link
14	Anuja Hariharan, Marc T. P. Adam, Verena Dorner, Ewa Lux, Marius B. Müller, Jella Pfeiffer, Christof Weinhardt	Brownie: A Platform for Conducting NeuroIS Experiments.	J. Assoc. Inf. Syst.	2017	DBLP DOI BibTeX RDF
14	Brice M. Bigendako, Eugene Syriani	Automatically Installing and Deploying Tools for Conducting Systematic Reviews in ReLiS.	CoRR	2017	DBLP BibTeX RDF
14	Cheng Feng 0004, Tingting Li 0001, Zhanxing Zhu, Deeph Chana	A Deep Learning-based Framework for Conducting Stealthy Attacks in Industrial Control Systems.	CoRR	2017	DBLP BibTeX RDF
14	Vahid Garousi, Michael Felderer, Mika V. Mäntylä	Guidelines for including the grey literature and conducting multivocal literature reviews in software engineering.	CoRR	2017	DBLP BibTeX RDF
14	György Csomós	Mapping spatial and temporal changes of global corporate research and development activities by conducting a bibliometric analysis.	CoRR	2017	DBLP BibTeX RDF
14	Marco Torchiano, Daniel Méndez Fernández, Guilherme Horta Travassos, Rafael Maiani de Mello	Lessons Learnt in Conducting Survey Research.	CoRR	2017	DBLP BibTeX RDF
14	Asterios Pantokratoras	Comment on the paper "Network and Nakamura tridiagonal computational simulation of electrically-conducting biopolymer micro-morphic transport phenomena O. Anwar Bég, J. Zueco, M. Norouzi, M. Davoodi, A. A. Joneidi, Assma F. Elsayed, Computers in Biology and Medicine 44 (2014) 44-56".	Comput. Biol. Medicine	2017	DBLP DOI BibTeX RDF
14	Hyun Jong Kim, Byung Sang Song, Won-Ju Cho, Jong Tae Park 0003	Reliability of amorphous InGaZnO TFTs with ITO local conducting buried layer for BEOL power transistors.	Microelectron. Reliab.	2017	DBLP DOI BibTeX RDF
14	A. A. Dakhel	Improving carrier mobility with vanadium doping of transparent conducting CdO.	Microelectron. Reliab.	2017	DBLP DOI BibTeX RDF
14	Sang Min Kim, Min-Soo Kang, Won-Ju Cho, Jong Tae Park 0003	Negative bias illumination stress instability in amorphous InGaZnO thin film transistors with ITO local conducting buried layer.	Microelectron. Reliab.	2017	DBLP DOI BibTeX RDF
14	Christine L. Ogan, Roya Imani Giglou, Leen D'Haenens	Challenges of conducting survey research related to a social protest movement: Lessons learned from a study of Gezi protests involving the Turkish diaspora in three European countries.	Inf. Soc.	2017	DBLP DOI BibTeX RDF
14	Peter Twining, Rachelle S. Heller, Miguel Nussbaum, Chin-Chung Tsai	Some guidance on conducting and reporting qualitative studies.	Comput. Educ.	2017	DBLP DOI BibTeX RDF
14	Robert Lipton 0001, Anthony Polizzi, Lokendra Thakur	Novel Metamaterial Surfaces from Perfectly Conducting Subwavelength Corrugations.	SIAM J. Appl. Math.	2017	DBLP DOI BibTeX RDF
14	Junshan Lin, Hai Zhang	Scattering and Field Enhancement of a Perfect Conducting Narrow Slit.	SIAM J. Appl. Math.	2017	DBLP DOI BibTeX RDF
14	James Keller 0002, Dinesh Thakur, Maxim Likhachev, Jean Gallier, Vijay Kumar 0001	Coordinated Path Planning for Fixed-Wing UAS Conducting Persistent Surveillance Missions.	IEEE Trans Autom. Sci. Eng.	2017	DBLP DOI BibTeX RDF
14	Christopher James Pettit 0001, Robert Tanton, Jane Hunter 0001	An online platform for conducting spatial-statistical analyses of national census data across Australia.	Comput. Environ. Urban Syst.	2017	DBLP DOI BibTeX RDF
14	Giedre Sabaliauskaite, Geok See Ng, Justin Ruths, Aditya Mathur	A comprehensive approach, and a case study, for conducting attack detection experiments in Cyber-Physical Systems.	Robotics Auton. Syst.	2017	DBLP DOI BibTeX RDF
14	Shuhei Fukunaga, Tsuyoshi Funaki	Switching surge voltage suppression in SiC half-bridge module with double side conducting ceramic substrate and snubber capacitor.	IEICE Electron. Express	2017	DBLP DOI BibTeX RDF
14	Jiaqiang Xie, Li Ma, Wei Li, Yong Gao, Ning Mei Yu	A snapback-free reverse conducting IGBT with recess and floating buffer at the backside.	IEICE Electron. Express	2017	DBLP DOI BibTeX RDF
14	Stefan Schoebel, Wei Mi, Alexander Stein, Sergey Ovchinnikov, Ryan E. Pavlovicz, Frank DiMaio, David Baker, Melissa G. Chambers, Huayou Su, Dongsheng Li, Tom A. Rapoport, Maofu Liao	Cryo-EM structure of the protein-conducting ERAD channel Hrd1 in complex with Hrd3.	Nat.	2017	DBLP DOI BibTeX RDF
14	Sergey Lobov, Ksenia Balashova, Valeri A. Makarov, Victor B. Kazantsev	Competition of Spike-Conducting Pathways in STDP Driven Neural Networks.	NEUROTECHNIX	2017	DBLP DOI BibTeX RDF
14	Matthias Budde, Anja Exler, Till Riedel, Michael Beigl, Andrea Schankin	Lessons from failures in designing and conducting experimental studies: a brief anecdotal tutorial.	UbiComp/ISWC Adjunct	2017	DBLP DOI BibTeX RDF
14	Balbir Barn, Souvik Barat, Tony Clark 0001	Conducting Systematic Literature Reviews and Systematic Mapping Studies.	ISEC	2017	DBLP BibTeX RDF
14	Benjamin Green 0001, Marina Krotofil, Ali Abbasi 0002	On the Significance of Process Comprehension for Conducting Targeted ICS Attacks.	CPS-SPC@CCS	2017	DBLP DOI BibTeX RDF
14	Chia-Ju Peng, Tien Anh Nguyen, Kätlin Rohtlaid, Cédric Plesse, Shih-Jui Chen, Luc Chassagne, Barthelemy Cagneau	A versatile conducting interpenetrating polymer network for sensing and actuation.	ICRA	2017	DBLP DOI BibTeX RDF
14	Hao Wang 0033, Zhengquan Xu, Lizhi Xiong, Tao Wang 0037	Conducting Correlated Laplace Mechanism for Differential Privacy.	ICCCS (2)	2017	DBLP DOI BibTeX RDF
14	Ning Tang, Yang Jiang, Hemi Qu, Yanyan Wang, Xuexin Duan	Conducting polymer nanowires volatile organic compounds sensor array fabricated by soft lithography.	IEEE SENSORS	2017	DBLP DOI BibTeX RDF
14	Nicola Pompeo, Kostiantyn Torokhtii, Enrico Silva	Surface impedance measurements in thin conducting films: Substrate and finite-thickness-induced uncertainties.	I2MTC	2017	DBLP DOI BibTeX RDF
14	Martin Antensteiner, Mohammad Reza Abidian	Tunable nanostructured conducting polymers for neural interface applications.	EMBC	2017	DBLP DOI BibTeX RDF
14	SooHyun Park, Mohammad Reza Abidian, Sheereen Majd	Micro-patterned films of bio-functionalized conducting polymers for cellular engineering.	EMBC	2017	DBLP DOI BibTeX RDF
14	Milad Khorrami, Martin Antensteiner, Fatemeh Fallahianbijan, Ali Borhan, Mohammad Reza Abidian	Conducting polymer microcontainers for biomedical applications.	EMBC	2017	DBLP DOI BibTeX RDF
14	Marek Penhaker, Jan Polomik, Jan Kubícek, Vladimir Kasik	Biopotential Conducting Polymer Electrodes Design and Realization for ECG Measurement.	BIODEVICES	2017	DBLP DOI BibTeX RDF
14	Andrea Salgian, David Vickerman, David Vassallo	A Smart Mirror for Music Conducting Exercises.	ACM Multimedia (Thematic Workshops)	2017	DBLP DOI BibTeX RDF
14	Farzana Rahman, Suzanne J. Matthews, Kelly A. Shaw 0001, Andrea Danyluk	Can we really do it?: Conducting Significant Computer Science Research in Primarily Undergraduate Institutions (PUIs) (Abstract Only).	SIGCSE	2017	DBLP DOI BibTeX RDF
14	Wayne Siegel	Conducting sound in space.	NIME	2017	DBLP DOI BibTeX RDF
14	Zexi Chen, Miguel Rodrigo, Alejandro Liberos, Ismael Hernández-Romero, Jesus Requena, Andreu M. Climent, María de la Salud Guillem Sánchez	Evaluation of Inverse Problem with Slow-Conducting Channel in Scar Area in a Post-Infarction Model. (PDF / PS)	CinC	2017	DBLP DOI BibTeX RDF
14	Hiroki Kurumatani, Seiichiro Katsura	GaN-HEMT-based three level T-type NPC inverter using reverse-conducting mode in rectifying.	ISIE	2017	DBLP DOI BibTeX RDF
14	Dapeng Liu, Shaochun Xu, Brian Zhang, Chunlin Wang, Chunqing Li, Feng Zhou	Issues with conducting controlled on-line experiments for E-Commerce.	SNPD	2017	DBLP DOI BibTeX RDF
14	Frisque Brennen, Ankur Chattopadhyay	Conducting a social constructivist epistemology for students of computing disciplines.	FIE	2017	DBLP DOI BibTeX RDF
14	Molly Hathaway Goldstein, Sharifah A. Omar, Robin S. Adams, Senay Purzer	Student conceptions of 'conducting tests' in design in the middle school classroom.	FIE	2017	DBLP DOI BibTeX RDF
14	Ronan-Alexandre Cherrueau, Dimitri Pertin, Anthony Simonet, Adrien Lèbre, Matthieu Simonin	Toward a Holistic Framework for Conducting Scientific Evaluations of OpenStack.	CCGrid	2017	DBLP DOI BibTeX RDF
14	Kelly Karipidou, Josefin Ahnlund, Anders Friberg, Simon Alexanderson, Hedvig Kjellström	Computer Analysis of Sentiment Interpretation in Musical Conducting.	FG	2017	DBLP DOI BibTeX RDF
14	Debra Burleson, Wallace Chipidza	Conducting Research in a Developing Country: A Reflection-in-Action Perspective.	HICSS	2017	DBLP BibTeX RDF
14	Diane Kelly 0001, Anita Crescenzi	From Design to Analysis: Conducting Controlled Laboratory Experiments with Users.	SIGIR	2017	DBLP DOI BibTeX RDF
14	Ali Abedi 0002, Tim Brecht	Conducting Repeatable Experiments in Highly Variable Cloud Computing Environments.	ICPE	2017	DBLP DOI BibTeX RDF
14	Hendrik Stern, Till Becker	A Variable Low-cost Platform for Conducting Work Design Experiments.	Forum Media Technology	2017	DBLP BibTeX RDF
14	Xiaojun Meng, Pin Sym Foong, Simon T. Perrault, Shengdong Zhao	NexP: A Beginner Friendly Toolkit for Designing and Conducting Controlled Experiments.	INTERACT (3)	2017	DBLP DOI BibTeX RDF
14		5th IEEE/ACM International Workshop on Conducting Empirical Studies in Industry, CESI@ICSE 2017, Buenos Aires, Argentina, May 23, 2017	CESI@ICSE	2017	DBLP BibTeX RDF
14	Jeremías P. Contell, Oscar Díaz, John R. Venable	DScaffolding: A Tool to Support Learning and Conducting Design Science Research.	DESRIST	2017	DBLP DOI BibTeX RDF
14	Nicola Ferro 0001, Paolo Picello, Gianmaria Silvello	A Software Library for Conducting Large Scale Experiments on Learning to Rank Algorithms.	LEARNER@ICTIR	2017	DBLP BibTeX RDF
14	Jonathan E. Gabbay, Waymond R. Scott	The eigendecomposition of the eddy current problem in thin conducting shells.	IGARSS	2017	DBLP DOI BibTeX RDF
14	Sedigheh Mahdavi, Shahryar Rahnamayan	Enhancing discrete differential evolution by conducting election.	SSCI	2017	DBLP DOI BibTeX RDF
14	Dirk Reith, Tobias Haedecke, Elena Schulz, Lutz Langel, Lukas Gemein, Iris Gross	Practical undergraduate projects within the BRSU race academy: An example for conducting a new tutored peer-teaching learning approach.	EDUCON	2017	DBLP DOI BibTeX RDF
14	Erica Southgate, Shamus P. Smith	Designing and conducting research using immersive technologies in schools: Seven observations.	KELVAR@VR	2017	DBLP DOI BibTeX RDF
14	Markku Oivo	How to Commit Companies in Collaborative Empirical Research.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Todd Sedano, Paul Ralph, Cécile Péraire	Lessons Learned from an Extended Participant Observation Grounded Theory Study.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Patrick Morrison, Benjamin H. Smith, Laurie A. Williams	Measuring Security Practice Use: A Case Study at IBM.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Oscar Dieste, Efraín R. Fonseca C., Geovanny Raura, Priscila Rodriguez	Professionals Are Not Superman: Failures beyond Motivation in Software Experiments.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Jacob Krüger, Ivonne Schröter, Andy Kenner, Thomas Leich	Empirical Studies in Question-Answering Systems: A Discussion.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Carmelo Ardito, Maria Teresa Baldassarre, Danilo Caivano, Rosa Lanzilotti	Integrating a SCRUM-Based Process with Human Centred Design: An Experience from an Action Research Study.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Magne Jørgensen	Working with Industry: Stories of Successful and Failed Research-Industry Collaborations on Empirical Software Engineering.	CESI@ICSE	2017	DBLP DOI BibTeX RDF
14	Ji Qiang	Efficient three-dimensional Poisson solvers in open rectangular conducting pipe.	Comput. Phys. Commun.	2016	DBLP DOI BibTeX RDF
14	Khai N. Truong	Pilot Studies: When and how to conduct them when conducting user studies.	GetMobile Mob. Comput. Commun.	2016	DBLP DOI BibTeX RDF
14	Min Meng 0004, Yongpin Chen, Wan Luo, Zaiping Nie, Jun Hu	Fast Analysis of Electromagnetic Scattering From Conducting Objects Buried Under a Lossy Ground.	IEEE Geosci. Remote. Sens. Lett.	2016	DBLP DOI BibTeX RDF
14	Amir Abdolahi, Michael T. Bull, Kristin C. Darwin, Venayak Venkataraman, Matthew J. Grana, Earl Ray Dorsey, Kevin M. Biglan	A feasibility study of conducting the Montreal Cognitive Assessment remotely in individuals with movement disorders.	Health Informatics J.	2016	DBLP DOI BibTeX RDF
14	Karyn Cooper, Rebecca Hughes, Aliyah Shamji	The Interpretive Imagination Forum: A Hermeneutic Tagging Technique and Instructional Tool for Conducting Collaborative Video Research across the Social Sciences and Humanities.	Int. J. Online Pedagog. Course Des.	2016	DBLP DOI BibTeX RDF
14	Sule Dinç Zor, Hüsnü Cankurtaran	Impedimetric Humidity Sensor Based on Nanohybrid Composite of Conducting Poly(diphenylamine sulfonic acid).	J. Sensors	2016	DBLP DOI BibTeX RDF
14	Xiao Jia 0006, Lihua Liu, Guangyou Fang	The Finite-Conducting Ground's Effect on the Inductance of a Rectangular Loop.	J. Sensors	2016	DBLP DOI BibTeX RDF
14	Ryoichi Sato, Hiroshi Shirai	Electromagnetic Plane Wave Diffraction by Loaded N-Slits on Thick Conducting Screen.	IEICE Trans. Electron.	2016	DBLP DOI BibTeX RDF
14	Silvana Chambers, Kim Nimon, Paula Anthony-McMann	A Primer for Conducting Survey Research using MTurk: Tips for the Field.	Int. J. Adult Vocat. Educ. Technol.	2016	DBLP DOI BibTeX RDF
14	Alix Bouchon, Vincent Noblet, Fabrice Heitz, Julien Lamy, Frédéric Blanc 0002, Jean-Paul Armspach	Which is the most appropriate strategy for conducting multivariate voxel-based group studies on diffusion tensors?	NeuroImage	2016	DBLP DOI BibTeX RDF
14	Puneet Kumar Patra, William Graham Hoover, Carol Griswold Hoover, Julien Clinton Sprott	The Equivalence of Dissipation from Gibbs' Entropy Production with Phase-Volume Loss in Ergodic Heat-Conducting Oscillators.	Int. J. Bifurc. Chaos	2016	DBLP DOI BibTeX RDF
14	Michael Dumbser, Ilya Peshkov, Evgeniy I. Romenski, Olindo Zanotti	High order ADER schemes for a unified first order hyperbolic formulation of continuum mechanics: Viscous heat-conducting fluids and elastic solids.	J. Comput. Phys.	2016	DBLP DOI BibTeX RDF
14	Viswanath Venkatesh, Susan A. Brown, Yulia W. Sullivan	Guidelines for Conducting Mixed-methods Research: An Extension and Illustration.	J. Assoc. Inf. Syst.	2016	DBLP DOI BibTeX RDF
14	Jingsong Yang, Yang Du 0002, Jiancheng Shi 0001	Polarimetric Simulations of Bistatic Scattering From Perfectly Conducting Ocean Surfaces With 3 m/s Wind Speed at L-Band.	IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.	2016	DBLP DOI BibTeX RDF
14	Sara Calvo, Andres Morales	Conducting Video Research in the Social and Solidarity Economy: Empowering the Cinderella Economy Towards Social Justice.	Int. J. E Politics	2016	DBLP DOI BibTeX RDF
14	Tatiana Petrova, Fedor Shugaev	Calculation of the Acoustic Spectrum of a Cylindrical Vortex in Viscous Heat-Conducting Gas Based on the Navier-Stokes Equations.	Comput.	2016	DBLP DOI BibTeX RDF
14	Nick Scott, Michael Livingston, Aaron Hart, James Wilson, David Moore, Paul Dietze	SimDrink: An Agent-Based NetLogo Model of Young, Heavy Drinkers for Conducting Alcohol Policy Experiments.	J. Artif. Soc. Soc. Simul.	2016	DBLP DOI BibTeX RDF
14	Kacy Lundstrom, Pamela Martin, Dory Cochran	Making Strategic Decisions: Conducting and Using Research on the Impact of Sequenced Library Instruction.	Coll. Res. Libr.	2016	DBLP DOI BibTeX RDF
14	Jae-Seong Jeong, Yong-Hyun Kim, Chang-kyun Park, Heon-Do Kim, Joongho Choi	Effect of H/Ar treatment on ZnO: B transparent conducting oxide for flexible a-Si: H/μc-Si: H photovoltaic modules under damp heat stress.	Microelectron. Reliab.	2016	DBLP DOI BibTeX RDF
14	Václav Bajgar, Marek Penhaker, Lenka Martinková, Andrej Pavlovic, Patrycja Bober, Miroslava Trchová, Jaroslav Stejskal	Cotton Fabric Coated with Conducting Polymers and its Application in Monitoring of Carnivorous Plant Response.	Sensors	2016	DBLP DOI BibTeX RDF
14	Yu Zhao 0005, Luyao Cao, Lanlan Li, Wen Cheng, Liangliang Xu, Xinyu Ping, Lijia Pan, Yi Shi	Conducting Polymers and Their Applications in Diabetes Management.	Sensors	2016	DBLP DOI BibTeX RDF
14	Luke Miratrix, Robin Ackerman	Conducting sparse feature selection on arbitrarily long phrases in text corpora with a focus on interpretability.	Stat. Anal. Data Min.	2016	DBLP DOI BibTeX RDF
14	Wenyan Nie, Zhonggen Wang, Jie Zhu	Direct solution of electromagnetic scattering from perfect electric conducting targets by combing characteristic basis function method and hybrid ACA-FDM method.	J. Comput. Methods Sci. Eng.	2016	DBLP DOI BibTeX RDF
14	Keiji Goto, Naoki Kishimoto, Oki Okawa	Time-domain asymptotic-numerical solution for transient scattered field from a cylindrically curved conducting open sheet excited by UWB pulse wave.	IEICE Electron. Express	2016	DBLP DOI BibTeX RDF
14	Haiyan Meng, Douglas Thain, Alexander Vyushkov, Matthias Wolf 0003, Anna Woodard	Conducting reproducible research with Umbrella: Tracking, creating, and preserving execution environments.	eScience	2016	DBLP DOI BibTeX RDF
14	Hill Hiroki Kobayashi	Live Sound System with Social Media for Remotely Conducting Wildlife Monitoring.	HCI (19)	2016	DBLP DOI BibTeX RDF
14	Akiyoshi Yamamoto, Henry Cereno Barrameda Jr., Tatsunori Azuma, Hideaki Kasasaku, Kayoko Hirota, Momo Jinno, Maki Sumiyama, Tomoko Ota, Akihiko Goto, Noriyuki Kida, Noriaki Kuwahara, Hiroyuki Hamada	The Transfer of Expertise in Conducting a Participatory Music Therapy During a Combined Rehabilitation-Recreational Program in an Elderly Care Facility.	HCI (15)	2016	DBLP DOI BibTeX RDF
14	Tien Anh Nguyen, Luc Chassagne, Barthélemy Cagneau, Adelyne Fannir, Kätlin Rohtlaid, Tran Minh Giao Nguyen, Cédric Plesse, Frédéric Vidal, Chia-Ju Peng, Shih-Jui Chen	An embedded system to control conducting interpenetrating polymer networks actuators.	IEEE SENSORS	2016	DBLP DOI BibTeX RDF
14	Olivier Mareschal, Basile Dufay, Sylvain Lebargy, Gilles Allègre, Matthieu Denoual, Didier Robbes	Non conducting object detection using low frequency electric field imaging: Possible application to anomaly detection in insulating materials.	IEEE SENSORS	2016	DBLP DOI BibTeX RDF
14	Duc Canh Nguyen, Gérard Bailly, Frédéric Elisei	Conducting neuropsychological tests with a humanoid robot: Design and evaluation.	CogInfoCom	2016	DBLP DOI BibTeX RDF
14	Lindsay Vickery, Stuart James	Tectonic: a Networked, Generative and Interactive, Conducting Environment for iPad.	ICMC	2016	DBLP BibTeX RDF
14	Andrea Salgian, David Vickerman	Computer-Based Tutoring for Conducting Students.	ICMC	2016	DBLP BibTeX RDF
14	Kyungho Lee, Michael J. Junokas, Guy E. Garnett	A Review of Interactive Conducting Systems: 1970-2015.	ICMC	2016	DBLP BibTeX RDF
14	Peter Brezany, Thomas Ludescher, Thomas Feilhauer	Towards a novel infrastructure for conducting high productive cloud-based scientific analytics.	MIPRO	2016	DBLP DOI BibTeX RDF
14	Aman Yadav	Conducting Educational Research in the Computer Science Classroom: Choosing the appropriate research design to address your research questions (Abstract Only).	SIGCSE	2016	DBLP DOI BibTeX RDF
14	Haley MacLeod, Ben Jelen, Annu Prabhakar, Lora Oehlberg, Katie A. Siek, Kay Connelly	Lessons Learned from Conducting Group-Based Research on Facebook.	CHI Extended Abstracts	2016	DBLP DOI BibTeX RDF
14	Álvaro Sarasúa, Baptiste Caramiaux, Atau Tanaka	Machine Learning of Personal Gesture Variation in Music Conducting.	CHI	2016	DBLP DOI BibTeX RDF
14	Steve S. Sin, Laura A. Blackerby, Elvis Asiamah, Rhyner Washburn	Determining extremist organisations' likelihood of conducting cyber attacks.	CyCon	2016	DBLP DOI BibTeX RDF
14	Siswa A. N. van Riesen, Hannie Gijlers, Anjo Anjewierden, Ton de Jong	Supporting Planning and Conducting Experiments.	ICLS	2016	DBLP BibTeX RDF