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The most commonly used technique is spatial cloaking, which organizes users\u2019 exact locations into cloaked regions (CRs). This satisfies the K-anonymity requirement; that is, the querier is not distinguishable among K users within the CR. However, the practicality of cloaking techniques is limited due to the lack of privacy-preserving query processing capacity, for example, providing answers to the user's spatial queries based on knowledge of the user's cloaked location rather than the exact location. This paper proposes a cloaking system model called anonymity of motion vectors (AMV) that provides anonymity for spatial queries. The proposed AMV minimizes the CR of a mobile user using motion vectors. In addition, the AMV creates a ranged search area that includes the nearest neighbor (NN) objects to the querier who issued a CR-based query. The effectiveness of the proposed AMV is demonstrated in simulated experiments. <\/jats:p>","DOI":"10.1155\/2015\/815613","type":"journal-article","created":{"date-parts":[[2015,8,13]],"date-time":"2015-08-13T21:03:36Z","timestamp":1439499816000},"page":"815613","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":12,"title":["A Privacy-Preserving Continuous Location Monitoring System for Location-Based Services"],"prefix":"10.1177","volume":"11","author":[{"given":"Doohee","family":"Song","sequence":"first","affiliation":[{"name":"Information Communication Engineering, Wonkwang University, Iksan-shi 570-749, Republic of Korea"}]},{"given":"Jongwon","family":"Sim","sequence":"additional","affiliation":[{"name":"Information Communication Engineering, Wonkwang University, Iksan-shi 570-749, Republic of Korea"}]},{"given":"Kwangjin","family":"Park","sequence":"additional","affiliation":[{"name":"Information Communication Engineering, Wonkwang University, Iksan-shi 570-749, Republic of Korea"}]},{"given":"Moonbae","family":"Song","sequence":"additional","affiliation":[{"name":"Samsung Electronics, 416 Maetan 3-dong, Yeongtong-gu, Suwon, Republic of Korea"}]}],"member":"179","published-online":{"date-parts":[[2015,8,13]]},"reference":[{"key":"B1-2015-815613","doi-asserted-by":"publisher","DOI":"10.1007\/s11390-014-1442-9"},{"key":"B2-2015-815613","doi-asserted-by":"publisher","DOI":"10.3837\/tiis.2011.10.011"},{"key":"B3-2015-815613","doi-asserted-by":"publisher","DOI":"10.1007\/s10619-013-7121-y"},{"key":"B4-2015-815613","doi-asserted-by":"publisher","DOI":"10.1016\/j.eswa.2013.08.027"},{"issue":"2","key":"B5-2015-815613","first-page":"141","volume":"40","author":"Park C.-G.","year":"2013","journal-title":"Journal of Computing Science and Engineering"},{"issue":"6","key":"B6-2015-815613","first-page":"3","volume":"20","author":"Sim H.","year":"2013","journal-title":"Journal of Information Processing Systems"},{"key":"B7-2015-815613","doi-asserted-by":"publisher","DOI":"10.1109\/tmc.2008.112"},{"key":"B8-2015-815613","doi-asserted-by":"publisher","DOI":"10.1109\/mspec.2006.1652998"},{"key":"B9-2015-815613","doi-asserted-by":"publisher","DOI":"10.1109\/MSPEC.2003.1209608"},{"volume-title":"IT Roadmap to a Geospatial Future","year":"2003","author":"Muntz W. 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