乐胖代购免代理版

{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,10,6]],"date-time":"2024-10-06T00:51:56Z","timestamp":1728175916670},"reference-count":74,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2017,8,4]],"date-time":"2017-08-04T00:00:00Z","timestamp":1501804800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"The Shipboard Automatic Identification System (AIS) is crucial for navigation safety and maritime surveillance, data mining and pattern analysis of AIS information have attracted considerable attention in terms of both basic research and practical applications. Clustering of spatio-temporal AIS trajectories can be used to identify abnormal patterns and mine customary route data for transportation safety. Thus, the capacities of navigation safety and maritime traffic monitoring could be enhanced correspondingly. However, trajectory clustering is often sensitive to undesirable outliers and is essentially more complex compared with traditional point clustering. To overcome this limitation, a multi-step trajectory clustering method is proposed in this paper for robust AIS trajectory clustering. In particular, the Dynamic Time Warping (DTW), a similarity measurement method, is introduced in the first step to measure the distances between different trajectories. The calculated distances, inversely proportional to the similarities, constitute a distance matrix in the second step. Furthermore, as a widely-used dimensional reduction method, Principal Component Analysis (PCA) is exploited to decompose the obtained distance matrix. In particular, the top k principal components with above 95% accumulative contribution rate are extracted by PCA, and the number of the centers k is chosen. The k centers are found by the improved center automatically selection algorithm. In the last step, the improved center clustering algorithm with k clusters is implemented on the distance matrix to achieve the final AIS trajectory clustering results. In order to improve the accuracy of the proposed multi-step clustering algorithm, an automatic algorithm for choosing the k clusters is developed according to the similarity distance. Numerous experiments on realistic AIS trajectory datasets in the bridge area waterway and Mississippi River have been implemented to compare our proposed method with traditional spectral clustering and fast affinity propagation clustering. Experimental results have illustrated its superior performance in terms of quantitative and qualitative evaluations.<\/jats:p>","DOI":"10.3390\/s17081792","type":"journal-article","created":{"date-parts":[[2017,8,4]],"date-time":"2017-08-04T15:07:08Z","timestamp":1501859228000},"page":"1792","source":"Crossref","is-referenced-by-count":143,"title":["A Dimensionality Reduction-Based Multi-Step Clustering Method for Robust Vessel Trajectory Analysis"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-4293-4763","authenticated-orcid":false,"given":"Huanhuan","family":"Li","sequence":"first","affiliation":[{"name":"Hubei Key Laboratory of Inland Shipping Technology, School of Navigation, Wuhan University of Technology, Wuhan 430063, China"}]},{"given":"Jingxian","family":"Liu","sequence":"additional","affiliation":[{"name":"Hubei Key Laboratory of Inland Shipping Technology, School of Navigation, Wuhan University of Technology, Wuhan 430063, China"},{"name":"National Engineering Research Center for Water Transport Safety, Wuhan 430063, China"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-1591-5583","authenticated-orcid":false,"given":"Ryan","family":"Liu","sequence":"additional","affiliation":[{"name":"Hubei Key Laboratory of Inland Shipping Technology, School of Navigation, Wuhan University of Technology, Wuhan 430063, China"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-0394-4635","authenticated-orcid":false,"given":"Naixue","family":"Xiong","sequence":"additional","affiliation":[{"name":"School of Mathematics and Computer Science, Northeastern State University, Tahlequah, OK 74464, USA"}]},{"given":"Kefeng","family":"Wu","sequence":"additional","affiliation":[{"name":"School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-0117-8102","authenticated-orcid":false,"given":"Tai-hoon","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Convergence Security, Sungshin Women\u2019s University, 249-1 Dongseon-dong 3-ga, Seoul 136-742, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2017,8,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2218","DOI":"10.3390\/e15062218","article-title":"Vessel pattern knowledge discovery from AIS data a framework for anomaly detection and route prediction","volume":"15","author":"Pallotta","year":"2013","journal-title":"Entropy"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"110","DOI":"10.1016\/j.eswa.2017.02.011","article-title":"A novel anomaly detection approach to identify intentional AIS on-off switching","volume":"78","author":"Mazzarella","year":"2017","journal-title":"Expert Syst. 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