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This article addresses two research problems that are vital for developing effective personal mobile assistants:\n            <jats:italic>target apps selection<\/jats:italic>\n            and\n            <jats:italic>recommendation<\/jats:italic>\n            . The former is the key component of a unified mobile search system: a system that addresses the users\u2019 information needs for all the apps installed on their devices with a unified mode of access. The latter, instead, predicts the next apps that the users would want to launch. Here we focus on context-aware models to leverage the rich contextual information available to mobile devices. We design an\n            <jats:italic>in situ<\/jats:italic>\n            study to collect thousands of mobile queries enriched with mobile sensor data (now publicly available for research purposes). With the aid of this dataset, we study the user behavior in the context of these tasks and propose a family of context-aware neural models that take into account the sequential, temporal, and personal behavior of users. We study several state-of-the-art models and show that the proposed models significantly outperform the baselines.\n          <\/jats:p>","DOI":"10.1145\/3447678","type":"journal-article","created":{"date-parts":[[2021,5,6]],"date-time":"2021-05-06T04:14:52Z","timestamp":1620274492000},"page":"1-30","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":21,"title":["Context-aware Target Apps Selection and Recommendation for Enhancing Personal Mobile Assistants"],"prefix":"10.1145","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9447-4172","authenticated-orcid":false,"given":"Mohammad","family":"Aliannejadi","sequence":"first","affiliation":[{"name":"University of Amsterdam, The Netherlands"}]},{"given":"Hamed","family":"Zamani","sequence":"additional","affiliation":[{"name":"University of Massachusetts Amherst, USA"}]},{"given":"Fabio","family":"Crestani","sequence":"additional","affiliation":[{"name":"Universit\u00e0 della Svizzera italiana (USI), Switzerland"}]},{"given":"W. 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