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Welcome all of you to join ACM Multimedia 2021, the 29th ACM International Conference on Multimedia. ACM Multimedia is the premier international conference series in the area of multimedia within the field of computer science. Since 1993, ACM Multimedia has been bringing together worldwide researchers and practitioners from academia and industry to present their innovative research and to discuss recent advancements in multimedia. Due to the continuous influence of COVID-19 all over the world since the end of 2019, the traditional onsite international conferences have to move to online mode. Notably, the last year ACM Multimedia conference 2020, has been successfully held totally online for the first time in history. During the online conference in the last year, face-to-face gatherings had been replaced by all-hands live sessions, parallel live question-answering (Q&A) sessions, and presentations from the authors via pre-recorded videos. This would be a reasonable solution to hold such a large-scale meeting during the COVID-19 period. Fortunately, the good epidemic prevention effect in China allows us to consider a more appropriate hybrid form to hold the conference onsite and online jointly. Our vision is to enrich the interaction of attendees all over the world via both physically face-to-face and virtually online fashions. The hybrid conference this year indeed brings greater challenges for organization. Firstly, we need to choose an appropriate conference venue that can accommodate hundreds of attendees. We finally find a good place in the downtown of the Chengdu city, where the attendees will definitely have a pleasant conference trip. Secondly, unlike the presentation form of papers on the purely online conference last year, all the conference papers this year are expected to be presented more informatively to both onsite and online attendees. Therefore, we adopt the traditional onsite conference form and divide the papers to oral and poster sessions with live streaming in each conference room, encouraging the onsite attendees to present their work physically and online attendees to provide live talks. Besides, we will also build a web portable platform (both Apps and websites) to collect the pre-recoded videos and posters of all papers, which will facilitate all attendees to view these resources before and during the conference. Moreover, free poster printing service will be available during the conference to enable the attendees onsite to view the printed posters of the authors who cannot physically attend the conference, which is expected to further enrich their exchange on the research work. Besides, we will also build remote interaction with authors in Q&A sessions via Zoom meetings. We really expect both onsite and online attendees to take advantage of the onsite oral/poster session and Q&A sessions after studying as many as possible related papers to interact directly with the paper authors. During the paper submission period of this year conference, we have tackled various unprecedented challenges and extended paper submission deadlines to provide sufficient time for participated teams. Nonetheless, we still have received a record-breaking number of 1,942 valid submissions for the main conference tracks (1,698 for last year) with an overall acceptance rate of 27.9% (542 papers), covering all areas and subareas of multimedia. This year, the conference will also be organized with a large diversity of tracks. In addition to the main track, the conference has tracks devoted to brave new ideas, industrial track, reproducibility companion, multimedia grand challenge, open source competition, interactive arts, and to multimedia demos.

Multimedia systems

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World Wide Web --- Internet --- Application software --- Sensor networks --- Computer science --- Web --- Logiciels d'application --- Réseaux de capteurs --- Informatique --- Congresses. --- Development --- Congrès --- Développement --- Computational grids (Computer systems) --- Computer Science --- Telecommunications --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- DARPA Internet --- Internet (Computer network) --- Popular works. --- Computer communication systems. --- Information storage and retrieval. --- Multimedia information systems. --- User interfaces (Computer systems). --- Computer science. --- Popular Science. --- Popular Computer Science. --- Information Storage and Retrieval. --- Information Systems Applications (incl. Internet). --- Multimedia Information Systems. --- User Interfaces and Human Computer Interaction. --- Computer Communication Networks. --- Informatics --- Science --- Interfaces, User (Computer systems) --- Human-machine systems --- Human-computer interaction --- Computer-based multimedia information systems --- Multimedia computing --- Multimedia information systems --- Multimedia knowledge systems --- Information storage and retrieval systems --- Communication systems, Computer --- Computer communication systems --- Data networks, Computer --- ECNs (Electronic communication networks) --- Electronic communication networks --- Networks, Computer --- Teleprocessing networks --- Data transmission systems --- Digital communications --- Electronic systems --- Information networks --- Telecommunication --- Cyberinfrastructure --- Electronic data processing --- Network computers --- Distributed processing --- Wide area networks (Computer networks) --- Information storage and retrieva. --- Multimedia systems. --- Information storage and retrieval systems. --- Automatic data storage --- Automatic information retrieval --- Automation in documentation --- Computer-based information systems --- Data processing systems --- Data storage and retrieval systems --- Discovery systems, Information --- Information discovery systems --- Information processing systems --- Information retrieval systems --- Machine data storage and retrieval --- Mechanized information storage and retrieval systems --- Computer systems --- Electronic information resources --- Data libraries --- Digital libraries --- Information organization --- Information retrieval --- Application software. --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software

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This two-volume set of LNAI 12274 and LNAI 12275 constitutes the refereed proceedings of the 13th International Conference on Knowledge Science, Engineering and Management, KSEM 2020, held in Hangzhou, China, in August 2020.* The 58 revised full papers and 27 short papers were carefully reviewed and selected from 291 submissions. The papers of the first volume are organized in the following topical sections: knowledge graph; knowledge representation; knowledge management for education; knowledge-based systems; and data processing and mining. The papers of the second volume are organized in the following topical sections: machine learning; recommendation algorithms and systems; social knowledge analysis and management; text mining and document analysis; and deep learning. *The conference was held virtually due to the COVID-19 pandemic.

Artificial intelligence. --- Application software. --- Data mining. --- Database management. --- Artificial Intelligence. --- Information Systems Applications (incl. Internet). --- Computer Appl. in Social and Behavioral Sciences. --- Data Mining and Knowledge Discovery. --- Database Management. --- Computer Appl. in Administrative Data Processing. --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software --- Data base management --- Data services (Database management) --- Database management services --- DBMS (Computer science) --- Generalized data management systems --- Services, Database management --- Systems, Database management --- Systems, Generalized database management --- Electronic data processing --- Algorithmic knowledge discovery --- Factual data analysis --- KDD (Information retrieval) --- Knowledge discovery in data --- Knowledge discovery in databases --- Mining, Data --- Database searching --- AI (Artificial intelligence) --- Artificial thinking --- Electronic brains --- Intellectronics --- Intelligence, Artificial --- Intelligent machines --- Machine intelligence --- Thinking, Artificial --- Bionics --- Cognitive science --- Digital computer simulation --- Logic machines --- Machine theory --- Self-organizing systems --- Simulation methods --- Fifth generation computers --- Neural computers --- Knowledge acquisition (Expert systems)

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The QOS evaluating model for computational grid nodes put forward can help greatly improving the self-adaptability of resource management and accelerating the appli- tion and development of Computational Grid. Now this model has been applied in NPU Campus Computational Grid. And the good effect brought by it has effectively proved its function. References 1. Foster, I. and C. Kesselman, eds. The Grid: Blueprint for a New Computing Infrastructure. Morgan Kaufmann, 1999. 2. Liu Liang, Zhou Xing-she, and Gu Jian-hua: A Multi-Agent System for Grid Computing. The Second International Conference on Active Media Technology, 2003 3. Yao Wang, Julita Vassileva: Trust and Reputation Model in Peer-to-Peer Networks. Third International Conference on Peer-to-Peer Computing, IEEE, 2003 4. http://www. xahuading. com/bbs/article. asp?ntypeid=33&titleid=1347&page=2 5. Christophe Diot and Aruna Seneviratne: Quality of Service in Heterogeneous Distributed Systems. Proceedings of The Thirtieth Annual Hawwaii International Conference on S- tem Sciences, IEEE, 1997 6. Farag Azzedin and Muthucumaru Maheswaran: Towards Trust-Aware Resource Mana- ment in Grid Computing Systems. Proceedings of the 2nd IEEE/ACM International Sym- sium on Cluster Computing and the Grid, 2002 7. Farag Azzedin and Muthucumaru Maheswaran: Integrating Trust into Grid Resource M- agement Systems. Proceedings of the International Conference on Parallel Processing, 2002 An Enterprize Work?ow Grid/P2P Architecture for Massively Parallel and Very Large Scale Work?ow Systems Kwanghoon Kim Collaboration Technology Research Lab. , Department of Computer Science, Kyonggi University kwang@kyonggi. ac. kr http://ctrl. kyonggi. ac. kr Abstract.

Computer architecture. Operating systems --- Information systems --- Computer. Automation --- ICT (informatie- en communicatietechnieken) --- IR (information retrieval) --- informatica --- maatschappij --- multimedia --- informatiesystemen --- computernetwerken

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Programming --- Computer architecture. Operating systems --- Information systems --- Artificial intelligence. Robotics. Simulation. Graphics --- applicatiebeheer --- apps --- database management --- KI (kunstmatige intelligentie) --- architectuur (informatica) --- data acquisition