[ALIBABA] Alibaba DAMO Academy at TREC Clinical Trials 2021: Exploring Embedding-based First-stage Retrieval with TrialMatcher
Qiao Jin, Zhengyun Zhao, Zheng Yuan - Tsinghua University
Qiao Jin, Chuanqi Tan, Zheng Yuan and Songfang Huang - Alibaba Inc.

[CFDA_CLIP] An Exploration Study of Multi-stage Conversational Passage Retrieval: Paraphrase Query Expansion and Multi-view Point-wise Ranking
Jia-Huei Ju, Chih-Ting Yeh, Cheng-Wei Lin, Chia-Ying Tsao, Jun-En Ding and Chuan-Ju Wang - Research Center for Information Technology Innovation, Academia Sinica
Ming-Feng Tsai - Department of Computer Science, National Chengchi University

[CMU-LTI] Query Rewriting with Expansion and Multi-Turn Entity Graphs for Answer Selection
Nour Jedidi, Gustavo Goncalves and Jamie Callan - Language and Technology Institute, Carnegie Mellon University, USA
Gustavo Goncalves - NOVA LINCS, Universidade NOVA de Lisboa, Portugal

[CNR] Finding Context through Utterance Dependencies in Search Conversations - Participation of the CNR Team in CAsT 2021
Ida Mele - IASI-CNR, Rome, Italy
Cristina Ioana Muntean, Franco Maria Nardini and Raffaele Perego - ISTI-CNR, Pisa, Italy
Nicola Tonellotto - University of Pisa, Italy

[IITD-DBAI] IITD-DBAI: Multi-Stage Retrieval with Pseudo-Relevance Feedback and Query Reformulation
Shivani Choudhary - Indian Institute of Technology, Delhi

[IRlab-Amsterdam] IRLab-Amsterdam at TREC 2021 Conversational Assistant Track
Antonios Minas Krasakis and Evangelos Kanoulas - University of Amsterdam, The Netherlands

[MLIA-LIP6] MLIA-LIP6@TREC-CAST2021: Feature augmentation for query recontextualization and passage ranking
Nawel Astaouti, Thomas Gerald, Maya Touzari and Laure Soulier - CNRS-ISIR, Sorbonne University, Paris, France
Jian-Yun Nie - University of Montreal, Montreal, Canada

[RUIR] Radboud University at TREC CAsT 2021
Hideaki Joko, Emma J. Gerritse, Faegheh Hasibi, and Arjen P. de Vries - Radboud University, Nijmegen, The Netherlands

[TKB48] TKB48 at TREC 2021 Conversational Assistance Track
Yubo Fang - Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
Hideo Joho - Faculty of Library, Information and Media Science, University of Tsukuba, Ibaraki, Japan
Sumio Fujita - Yahoo Japan Corporation, Tokyo, Japan

[UiS] The University of Stavanger (IAI) at the TREC 2021 Conversational Assistance Track
Ivica Kostric, Krisztian Balog, Magnus Book, Trond Linjordet, and Vinay Setty - University of Stavanger, Norway

[UMD] Full-Collection Search with Passage and Document Evidence: Maryland at the TREC 2021 Conversational Assistance Track
Xin Qian and Douglas W. Oard - University of Maryland, College Park

[WaterlooClarke] WaterlooClarke at the TREC 2021 Conversational Assistant Track
Xinyi Yan, Charles L. A. Clarke and Negar Arabzadeh -

Clinical Trials

[BITEM] SIB Text Mining at TREC Clinical Trials 2021
Deborah Caucheteura, Emilie Pasche, Luc Mottin, Anais Mottaz, Julien Gobeill and Patrick Ruch - HES-SO / HEG Geneva, Information Sciences, Geneva, Switzerland
Deborah Caucheteura, Emilie Pasche, Luc Mottin, Anais Mottaz, Julien Gobeill and Patrick Ruch - SIB Text Mining, Swiss Institute of Bioinformatics, Geneva, Switzerland
Luc Mottin - Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland

[CincyMedIR] CincyMedIR at TREC 2021 Clinical Trial Track
Hoang Vu, MSI - Department of Biomedical Informatics, University of Cincinnati College of Medicine, Cincinnati, OH; Department of Electrical Engineering and Computer Science, College of Engineering and Applied Science
Danny T.Y. Wu, PhD - University of Cincinnati, Cincinnati, OH

[clinical_trials] An approach to relevant clinical trials retrieving
Mariia Fedorova - ElmDoc B.V.

[CSIROmed] CSIROmed Team Report of TREC 2021 Clinical Trials track: Experiments with BERT Reranking Methods
Maciej Rybinski, Vincent Nguyen and Sarvnaz Karimi - CSIRO Data61, Sydney, Australia

[DOSSIER] DOSSIER at TREC 2021 Clinical Trials Track
Wojciech Kusa and Yasin Ghafourian - TU Wien, Vienna, Austria
Yasin Ghafourian - Research Studios Austria, Vienna, Austria

[GU_BioMed] Clinical Trial Search Using Lucene and UMLS
Yanqing Ji - Department of Electrical and Computer Engineering, Gonzaga University, Spokane, Washington, USA
Yun Tian - Department of Computer Sci. and Electrical Eng., Eastern Washington University, Spokane WA, USA
Hao Ying - Department of Electrical and Computer Engineering, Wayne State University, Detroit, Michigan, USA
John Tran - Department of Psychiatry, University of California San Francisco at Fresno, Fresno, California, USA

[IBMResearch] IBM @ TREC Clinical Trials Track 2021
Laura Biester - Computer Science & Engineering, University of Michigan
Venkata Joopudi and Bharath Dandala - IBM Research

[ims_unipd] Filter, Transform, Expand, and Fuse The IMS Unipd at TREC 2021 Clinical Trials
Giorgio Maria Di Nunzio, Guglielmo Faggioli and Stefano Marchesin - Department of Information Engineering, University of Padua, Italy

[IRUniDUE] TREC 2021⋆ Clinical Trials Retrieval, Duisburg-Essen University submission
Sameh Frihat and Norbert Fuhr - University of Duisburg-Essen, Duisburg, Germany

[ITTC-AIMedTech] ITTC @ TREC 2021 Clinical Trials Track
Hung-Thinh Truong, Yulia Otmakhova, Timothy Baldwin, Jey Han Lau, Trevor Cohn and Karin Verspoor - The University of Melbourne
Rahmad Mahendra, Karin Verspoor, Lawrence Cavedon, Damiano Spina and Karin Verspoor - RMIT University

[NTU_NLP] Hybrid Re-ranking for Biomedical Information Retrieval at the TREC 2021 Clinical Trials Track
Ming-Xuan Shi, Tsung-Hsuan Pan and Hsin-Hsi Chen - Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan
Hen-Hsen Huang - Institute of Information Science, Academia Sinica, Taipei, Taiwan

[POZNAN] Pozna´n Contribution to TREC Clinical Trials 2021⋆
Jakub Dutkiewicz and Czeslaw Jedrzejek - Faculty of Computing, Poznan University of Technology, Poznan, Poland

[TDMINER] The Application of Traditional IE as a Non-traditional Method in an IR Task: TDMINER at 2021 TREC Clinical Trials
Chengyi Zheng - Kaiser Permanente Southern California, Pasadena, CA

[uni_pais_vasco] TREC 2021 Clinical Trials Submission for Universidad del País Vasco
Jordan Koontz - Ixa (UPV/EHU)
Maite Oronoz and Alicia Pérez - HiTZ (UPV/EHU)

[UNIMIB] UNIMIB at TREC 2021 Clinical Trials Track
Georgios Peikos, Oscar Espitia, and Gabriella Pasi - Information and Knowledge Representation, Retrieval, and Reasoning (IKR3) Lab, Department of Informatics, Systems, and Communication (DISCo), University of Milano-Bicocca, Milan, Italy

[UNTIIA] UNTIIA Lab at TREC 2021 - Clinical Trial*
Huyen Nguyen, Haihua Chen, Bhanu Prasad and Junhua Ding - Intelligent Information Access Laboratory, University of North Texas
Huyen Nguyen, Haihua Chen, Bhanu Prasad, Junhua Ding, Jiangping Chen and Ana Cleveland - Department of Information Science, University of North Texas
Huanhuan Zhao - Department of Bioinformatics, University of Texas at El Paso

[wispermedtxt] WisPerMed Text at TREC Clinical Trials Track 2021
Henning Schafer - Institute for Transfusion Medicine, University Hospital Essen, Germany
Ahmad Idrissi-Yaghir and Christoph M. Friedrich - Department of Computer Science, University of Applied Sciences and Arts Dortmund (FHDO), Dortmund, Germany
Wolfgang Galetzka and Christoph M. Friedrich - Institute of Medical Informatics, Biometry and Epidemiology (IMIBE), University Hospital Essen, Germany
Marie Bexte - Language Technology Lab, University of Duisburg-Essen, Duisburg, Germany

Deep Learning

[CERTH_ITI_M4D] M4D-MKLab/ITI-CERTH Participation in TREC Deep Learning Track 2021
Alexandros-Michail Koufakis, Theodora Tsikrika, Stefanos Vrochidis and Ioannis Kompatsiaris - Information Technologies Institute, Centre for Research and Technology Hellas, Thermi-Thessaloniki, Greece

[CIP] CIP at TREC 2021 Deep Learning Track
Xuanang Chen, Ben He and Yingfei Sun - University of Chinese Academy of Sciences, Beijing, China
Xuanang Chen, Ben He and Le Sun - Chinese Information Processing Laboratory, Institute of Software, Chinese Academy of Sciences, Beijing, China

[IHSM] QUALITY AND COST TRADE-OFFS IN PASSAGE RE-RANKING TASK
Pavel Podberezko, Vsevolod Mitskevich, Raman Makouski, Pavel Goncharov, Andrei Khobnia, Nikolai Bushkov and Marina Chernyshevich - IHS Markit

[L3S] L3S at the TREC 2021 Deep Learning Track
Jurek Leonhardt and Avishek Anand - L3S Research Center,Hannover, Germany
Koustav Rudra - Indian Institute of Technology (ISM) Dhanbad, India

[NLE] NAVER LABS EUROPE (SPLADE) @ TREC DEEP LEARNING 2021
Carlos Lassance, Arnaud Sors and Stephane Clinchant - Naver Labs Europe, France
Thibault Formal - Naver Labs Europe and Sorbonne Universite, ISIR, France
Benjamin Piwowarski - Sorbonne Universite, ISIR, CNRS, France

[TU_Vienna] TU Wien at TREC DL and Podcast 2021: Simple Compression for Dense Retrieval
Sebastian Hofstatter, Mete Sertkan and Allan Hanbury - TU Wien

[UAmsterdam] Recall Aspects of Transformers for Text Ranking
David Rau and Jaap Kamps - University of Amsterdam

[Webis] Webis at TREC 2021: Deep Learning, Health Misinformation, and Podcasts Tracks
Alexander Bondarenko, Maik Frobe, Sebastian Gunther and Mahias Hagen - Martin-Luther-Universitat Halle-Wittenberg
Marcel Gohsen, Johannes Kiesel, Michael Volske and Benno Stein - Bauhaus-Universitat Weimar
Jakob Schwerter, Shahbaz Syed and Martin Pohast - Leipzig University

[yorku] York University at TREC 2021: Deep Learning Track
Yizheng Huang and Jimmy Huang - Information Retrieval and Knowledge Management Research Lab, York University, Toronto, Canada

Fair Ranking

[IRlab-Amsterdam] The University of Amsterdam at the TREC 2021 Fair Ranking Track
Ali Vardasbi, Gabriel Bénédict, Shashank Gupta, Maria Heuss, Pooya Khandel, Ming Li and Fatemeh Sarvi - University of Amsterdam, The Netherlands

[RMIT-IR] RMIT at TREC 2021 Fair Ranking Track
SACHIN PATHIYAN CHERUMANAL, DAMIANO SPINA and FALK SCHOLER - RMIT University, Australia
W. BRUCE CROFT - University of Massachusetts Amherst, USA

[TKB48] TKB48 at TREC 2021 Fairness Ranking Track
Jin Zhuoqi - Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
Hideo Joho - Faculty of Library, Information and Media Science, University of Tsukuba, Ibaraki, Japan
Sumio Fujita - Yahoo Japan Corporation, Tokyo, Japan

[uogTr] University of Glasgow Terrier Team (uogTr) at the TREC 2021 Incident Streams Track
Xiao Wang, Sean MacAvaney, Craig Macdonald and Iadh Ounis - University of Glasgow, UK ************************
Thomas Jaenich, Graham McDonald and Iadh Ounis - University of Glasgow, UK ************************
Alexander J. Hepburn and Richard McCreadie - University of Glasgow, UK

Health Misinformation

[CiTIUS] CiTIUS at the TREC 2021 Health Misinformation Track
Marcos Fernandez-Pichel, Manuel Prada-Corral, David E. Losada, Juan C. Pichel and Pablo Gamallo - Centro Singular de Investigacion en Tecnoloxías Intelixentes (CiTIUS), Universidade de Santiago de Compostela 15782 Santiago de Compostela, Spain

[DigiLab] DS4DH at TREC Health Misinformation 2021: Multi-Dimensional Ranking Models with Transfer Learning and Rank Fusion
Boya Zhang, Fernando Jaume-Santero and Douglas Teodoro - Department of Radiology and Medical Informatics, University of Geneva
Nona Naderi and Douglas Teodoro - HES-SO University of Applied Sciences and Arts of Western Switzerland Swiss Institute of Bioinformatics
Nona Naderi and Douglas Teodoro - Swiss Institute of Bioinformatics

[UPV] UPV at TREC Health Misinformation Track 2021 Ranking with SBERT and Quality Estimators
Ipek Baris Schlicht, Angel Felipe Magnossao de Paula and Paolo Rosso - Universitat Politecnica de Valencia, Spain

[UwaterlooMDS] UWaterlooMDS at the TREC 2021 Health Misinformation Track
MUSTAFA ABUALSAUD, KAMYAR GHAJAR, LINH NHI PHAN MINH and DAKE ZHANG - David R. Cheriton School of Computer Science, University of Waterloo
IRENE XIANGYI CHEN - Department of Electrical and Computer Engineering, University of Waterloo
MARK D. SMUCKER and AMIR VAKILI TAHAMI - Department of Management Sciences, University of Waterloo

Incident Streams

[L3i_Rochelle] Transformer-based Methods with #Entities for Detecting Emergency Events on Social Media
Emanuela Boros, Nhu Khoa Nguyen, Mickael Coustaty and Antoine Doucet - University of La Rochelle, L3i, La Rochelle, France
Gael Lejeune - Sorbonne University, STIH/CERES, Paris, France

[njit] Method Comparison for Crisis Pipelines
Shivam Sharma and Cody Buntain - New Jersey Institute of Technology

[SienaCLTeam] Siena’s Incident Stream System SISS
Ting Liu, Sharon Gower Small, Patrick Baumgardner, Lydia Cartwright, Michael Coppola and Samuil Orlioglu - Siena College Institute for Artificial Intelligence, Loudonville, NY

[UCD-CS] UCD-CS at TREC 2021 Incident Streams Track
Congcong Wang and David Lillis - School of Computer Science, University College Dublin, Ireland

News

[FUH] University of Hagen @ TREC2021 News Track
Stefan Wagenpfeil and Matthias Hemmje - Faculty of Mathematics and Computer Science, University of Hagen, Germany
Paul Mc Kevitt - Academy for International Science & Research (AISR), Derry/Londonderry, Ireland

[IR-Cologne] IRCologne at TREC 2021 News Track Relation-based re-ranking for background linking
BJORN ENGELMANN and PHILIPP SCHAER - TH Koln (University of Applied Sciences), Germany

[L3i_Rochelle] Elastic Embedded Background Linking for News Articles with Keywords, Entities and Events
Luis Adrian Cabrera-Diego, Emanuela Boros and Antoine Doucet - University of La Rochelle, L3i, La Rochelle, France

[middlebury] Middlebury at TREC News ’21 Exploring Learning to Rank Model Variants
Culton Koster and John Foley - Department of Computer Science, Middlebury College, Middlebury, VT

[QU] bigIR at TREC 2021: Adopting Transfer Learning for News Background Linking
Marwa Essam and Tamer Elsayed - Computer Science and Engineering Department, Qatar University, Doha, Qatar

[SU-NLP] SU-NLP at TREC NEWS 2021
Kenan Fayoumi and Reyyan Yeniterzi - Sabancı University, Istanbul, Turkey

[TKB48] TKB48 at TREC 2021 News Track
Zhang Lirong - Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
Hideo Joho - Faculty of Library, Information and Media Science, University of Tsukuba, Ibaraki, Japan
Sumio Fujita - Yahoo Japan Corporation, Tokyo, Japan

[Waterloo_Cormack] Semantic Search for Background Linking in News Articles
Udhav Sethi and Anup Anand Deshmukh - University of Waterloo

Podcast

[PoliTO] PoliTO at TREC 2021 Podcast Summarization Track
Lorenzo Vaiani, Moreno La Quatra, Luca Cagliero and Paolo Garza - Dipartimento di Automatica e Informatica Politecnico di Torino, Italy

[TU_Vienna] TU Wien at TREC DL and Podcast 2021: Simple Compression for Dense Retrieval
Sebastian Hofstatter, Mete Sertkan and Allan Hanbury - TU Wien

[Unicamp] Multilingual Podcast Summarization using Longformers
Edgar Tanaka, Ann Clifton and Md. Iftekhar Tanveer - Spotify