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Your search keyword '"Xu, Jianqiu"' showing total 423 results
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423 results on '"Xu, Jianqiu"'

1. Towards Mobility Data Science (Vision Paper)

Author

Mokbel, Mohamed, Sakr, Mahmoud, Xiong, Li, Züfle, Andreas, Almeida, Jussara, Anderson, Taylor, Aref, Walid, Andrienko, Gennady, Andrienko, Natalia, Cao, Yang, Chawla, Sanjay, Cheng, Reynold, Chrysanthis, Panos, Fei, Xiqi, Ghinita, Gabriel, Graser, Anita, Gunopulos, Dimitrios, Jensen, Christian, Kim, Joon-Seok, Kim, Kyoung-Sook, Kröger, Peer, Krumm, John, Lauer, Johannes, Magdy, Amr, Nascimento, Mario, Ravada, Siva, Renz, Matthias, Sacharidis, Dimitris, Shahabi, Cyrus, Salim, Flora, Sarwat, Mohamed, Schoemans, Maxime, Speckmann, Bettina, Tanin, Egemen, Teng, Xu, Theodoridis, Yannis, Torp, Kristian, Trajcevski, Goce, van Kreveld, Marc, Wenk, Carola, Werner, Martin, Wong, Raymond, Wu, Song, Xu, Jianqiu, Youssef, Moustafa, Zeinalipour, Demetris, Zhang, Mengxuan, and Zimányi, Esteban

Subjects
Computer Science - Other Computer Science
Abstract

Mobility data captures the locations of moving objects such as humans, animals, and cars. With the availability of GPS-equipped mobile devices and other inexpensive location-tracking technologies, mobility data is collected ubiquitously. In recent years, the use of mobility data has demonstrated significant impact in various domains including traffic management, urban planning, and health sciences. In this paper, we present the emerging domain of mobility data science. Towards a unified approach to mobility data science, we envision a pipeline having the following components: mobility data collection, cleaning, analysis, management, and privacy. For each of these components, we explain how mobility data science differs from general data science, we survey the current state of the art and describe open challenges for the research community in the coming years., Comment: Updated to reflect the major revision for ACM Transactions on Spatial Algorithms and Systems (TSAS). This version reflects the final version accepted by ACM TSAS

Published
2023

2. NLITS: A Natural Language Interface for Time Series Databases

Author

Lin, Yuting, Xu, Jianqiu, Wang, Xieyang, Zhang, Yitong, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Zhang, Wenjie, editor, Tung, Anthony, editor, Zheng, Zhonglong, editor, Yang, Zhengyi, editor, Wang, Xiaoyang, editor, and Guo, Hongjie, editor

Published
2024
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3. GaussTS: Towards Time Series Data Management in OpenGauss

Author

Li, Lu, Zhang, Xu, Pu, Feifan, Li, Yi, Xu, Jianqiu, Zhong, Zhou, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Song, Xiangyu, editor, Feng, Ruyi, editor, Chen, Yunliang, editor, Li, Jianxin, editor, and Min, Geyong, editor

Published
2024
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5. A Comparative Study of Row and Column Storage for Time Series Data

Author

Li, Lu, Pu, Feifan, Li, Yi, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Meng, Xiaofeng, editor, Li, Xiang, editor, Xu, Jianqiu, editor, Zhang, Xueying, editor, Fang, Yuming, editor, Zheng, Bolong, editor, and Li, Yafei, editor

Published
2023
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7. MOCache: A Cache Management Tool for Moving Object Databases

Author

Wu, Bingya, Jin, Xin, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wang, Xin, editor, Sapino, Maria Luisa, editor, Han, Wook-Shin, editor, El Abbadi, Amr, editor, Dobbie, Gill, editor, Feng, Zhiyong, editor, Shao, Yingxiao, editor, and Yin, Hongzhi, editor

Published
2023
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8. Predicting Where You Visit in a Surrounding City: A Mobility Knowledge Transfer Framework Based on Cross-City Travelers

Author

Xu, Shuai, Xu, Jianqiu, Li, Bohan, Fu, Xiaoming, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wang, Xin, editor, Sapino, Maria Luisa, editor, Han, Wook-Shin, editor, El Abbadi, Amr, editor, Dobbie, Gill, editor, Feng, Zhiyong, editor, Shao, Yingxiao, editor, and Yin, Hongzhi, editor

Published
2023
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9. Block-Join: A Partition-Based Method for Processing Spatio-Temporal Joins

Author

Li, Ting, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Li, Bohan, editor, Yue, Lin, editor, Tao, Chuanqi, editor, Han, Xuming, editor, Calvanese, Diego, editor, and Amagasa, Toshiyuki, editor

Published
2023
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10. RN-Cluster: A Novel Density-Based Clustering Approach for Road Network Partition

Author

Ding, Yingying, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Li, Bohan, editor, Yue, Lin, editor, Tao, Chuanqi, editor, Han, Xuming, editor, Calvanese, Diego, editor, and Amagasa, Toshiyuki, editor

Published
2023
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16. ARCA: A Tool for Area Calculation Based on GPS Data

Author

Song, Sujing, Sun, Jie, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Jensen, Christian S., editor, Lim, Ee-Peng, editor, Yang, De-Nian, editor, Lee, Wang-Chien, editor, Tseng, Vincent S., editor, Kalogeraki, Vana, editor, Huang, Jen-Wei, editor, and Shen, Chih-Ya, editor

Published
2021
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17. Spatial Queries Based on Learned Index

Author

Wang, Ning, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Meng, Xiaofeng, editor, Xie, Xing, editor, Yue, Yang, editor, and Ding, Zhiming, editor

Published
2021
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18. Efficiently Update Disk-Resident Interval Tree

Author

Xu, Jianqiu, Wei, Jianhua, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Meng, Xiaofeng, editor, Xie, Xing, editor, Yue, Yang, editor, and Ding, Zhiming, editor

Published
2021
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19. Efficiently Detecting Light Events in Astronomical Temporal Data

Author

Fang, Chenglong, Wang, Xieyang, Xu, Jianqiu, Wang, Feng, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Meng, Xiaofeng, editor, Xie, Xing, editor, Yue, Yang, editor, and Ding, Zhiming, editor

Published
2021
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20. Dynamic Shortest Path Queries over Moving Objects on Road Networks

Author

Chen, Siyu, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Meng, Xiaofeng, editor, Xie, Xing, editor, Yue, Yang, editor, and Ding, Zhiming, editor

Published
2021
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23. Mobility Data Science: Perspectives and Challenges

Author

Mokbel, Mohamed, primary, Sakr, Mahmoud, additional, Xiong, Li, additional, Züfle, Andreas, additional, Almeida, Jussara, additional, Anderson, Taylor, additional, Aref, Walid, additional, Andrienko, Gennady, additional, Andrienko, Natalia, additional, Cao, Yang, additional, Chawla, Sanjay, additional, Cheng, Reynold, additional, Chrysanthis, Panos, additional, Fei, Xiqi, additional, Ghinita, Gabriel, additional, Graser, Anita, additional, Gunopulos, Dimitrios, additional, Jensen, Christian S., additional, KIM, Joon-Seok, additional, Kim, Kyoung-Sook, additional, Kröger, Peer, additional, Krumm, John, additional, Lauer, Johannes, additional, Magdy, Amr, additional, Nascimento, Mario, additional, Ravada, Siva, additional, Renz, Matthias, additional, Sacharidis, Dimitris, additional, Salim, Flora, additional, Sarwat, Mohamed, additional, Schoemans, Maxime, additional, Shahabi, Cyrus, additional, Speckmann, Bettina, additional, Tanin, Egemen, additional, Teng, Xu, additional, Theodoridis, Yannis, additional, Torp, Kristian, additional, Trajcevski, Goce, additional, van Kreveld, Marc, additional, Wenk, Carola, additional, Werner, Martin, additional, Wong, Raymond, additional, WU, Song, additional, Xu, Jianqiu, additional, Youssef, Moustafa, additional, Zeinalipour, Demetris, additional, Zhang, Mengxuan, additional, and Zimányi, Esteban, additional

Published
2024
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24. Detection of Loose Tracking Behavior over Trajectory Data

Author

Li, Jiawei, Dai, Hua, Liu, Yiyang, Xu, Jianqiu, Sun, Jie, Yang, Geng, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, and Qiu, Meikang, editor

Published
2020
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25. Developing spatiotemporal solitons in step-index multimode fibers

Author

Wang, Yao, Yan, Shuo, Xu, Jianqiu, and Tang, Yulong

Subjects
Nonlinear Sciences - Pattern Formation and Solitons, Physics - Optics
Abstract

Spatiotemporal solitons (STSs) are localized solitary waves in both space and time that involve complex linear and nonlinear processes. Optical STSs have been observed in various media, but they are difficult to be realized in multimode fibers due to their large modal dispersion. Here, we report STS mode-locking and spatiotemporal nonlinear dynamics in a step-index multimode fiber mediated by gain. Gain competition and energy redistribution among different spatial modes help nonlinearity effectively cancel both temporal splitting and spatial diffracting of the entire pulse (multicomponent soliton) and thereby maintain its shape during propagation. Optical STSs in multimode fibers therefore open a new way to clarify the fundamental science of spatiotemporal solitary waves and also imply important applications in multi-channel communications, optical switches and mode-area power scaling of fiber laser pulses., Comment: 18 pages,9 figures

Published
2016

27. Influences of pump transitions on thermal effects of multi-kilowatt thulium-doped fiber lasers

Author

Yang, Jianlong, Wang, Yao, Tang, Yulong, and Xu, Jianqiu

Subjects
Physics - Optics
Abstract

Thermal effects are critical constrains for developing high-power thulium-doped fiber lasers (TDFLs). In this paper, we numerically investigate the lasing and thermal characteristics of the TDFLs under different pump transitions. Our results show, the widely-used pump transition $^3H_6\rightarrow^3H_4$, taking advantages of high-power high-efficiency laser diodes at $\sim$0.8 $\mu$m, may not be a superior choice for directly outputting multi-kilowatt at 2 $\mu$m because of severe thermal problems. Meanwhile, using other pump transitions resulting 2-$\mu$m emissions, especially the in-band pump transition $^3H_6\rightarrow^3F_4$, will decrease the generated heat to a large extent. By optimizing the power filling factor of the gain fiber, we find a 2-$\mu$m TDFL cladding-pumped at 1.9 $\mu$m will lead to the laser slope efficiency close to its quantum efficiency (95\%). The induced ultra-low quantum defect would be of great importance for power scaling. We thus propose tandem-pumped TDFLs for reducing the heat at high powers and discuss the related issues of design. Besides, we also explore the differences of the thermal characteristics between laser and superfluorescent operations, which will contribute to deepening the understanding of the thermal effects in high-power thulium-doped fiber amplifiers.

Published
2015

28. A Mobile Phone Data Visualization Tool for People Flow Analysis

Author

Chen, Liangjian, Chen, Siyu, Guo, Shengnan, Yang, Yue, Xu, Jianqiu, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Shao, Jie, editor, Yiu, Man Lung, editor, Toyoda, Masashi, editor, Zhang, Dongxiang, editor, Wang, Wei, editor, and Cui, Bin, editor

Published
2019
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29. MDBF: A Tool for Monitoring Database Files

Author

Wei, Xiangyu, Xu, Jianqiu, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Woo, Carson, editor, Lu, Jiaheng, editor, Li, Zhanhuai, editor, Ling, Tok Wang, editor, Li, Guoliang, editor, and Lee, Mong Li, editor

Published
2018
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39. Detect Tracking Behavior Among Trajectory Data

Author

Xu, Jianqiu, Zhou, Jiangang, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Cong, Gao, editor, Peng, Wen-Chih, editor, Zhang, Wei Emma, editor, Li, Chengliang, editor, and Sun, Aixin, editor

Published
2017
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40. A System for Querying and Displaying Typed Intervals

Author

Xu, Jianqiu, Liang, Junxiu, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Gertz, Michael, editor, Renz, Matthias, editor, Zhou, Xiaofang, editor, Hoel, Erik, editor, Ku, Wei-Shinn, editor, Voisard, Agnes, editor, Zhang, Chengyang, editor, Chen, Haiquan, editor, Tang, Liang, editor, Huang, Yan, editor, Lu, Chang-Tien, editor, and Ravada, Siva, editor

Published
2017
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41. A Tool for 3D Visualizing Moving Objects

Author

Wang, Weiwei, Xu, Jianqiu, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Chen, Lei, editor, Jensen, Christian S., editor, Shahabi, Cyrus, editor, Yang, Xiaochun, editor, and Lian, Xiang, editor

Published
2017
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47. Efficiently Answering Top-k Window Aggregate Queries: Calculating Coverage Number Sequences over Hierarchical Structures

Author

Xu, Jianqiu, Wong, Chi Wing, Xu, Jianqiu, and Wong, Chi Wing

Abstract

Given a set of spatio-temporal objects, a top-k window aggregate query reports top-k tuples that are ordered with respect to the number of objects during a given time interval and within a spatial range. For example, when analyzing traffic density in a city, one wishes to retrieve top-k time intervals in a certain area that are decreasingly ordered according to the number of vehicles passing by. As simply performing sequential scan over all objects is a costly procedure, an index structure is typically built to enhance the query performance. A crucial step during the evaluation is to determine the number of objects in an arbitrary node, called coverage number sequence. This is a challenging task since objects appear and disappear at different time points such that the number of objects in the query node changes over time. Also, as a hierarchical index structure, the value of a node at high level is achieved by performing the aggregation over its child nodes. Simply enumerating all objects rooted in the query node suffers from performance issues mainly due to (i) traversing the sub-tree to retrieve a large number of time points and (ii) repeatedly performing the aggregation at certain time points. We propose an efficient approach to solve the performance issue for both R-tree and Octree and support updating for new arrival data objects being inserted into the index. Our approach outperforms alternative methods in general according to a thorough analysis on the complexity. Coverage number sequences as well as proposed optimization techniques are utilized to enhance the performance of window aggregate queries. We confirm the superiority of our approach over alternative methods by performing a comprehensive experimental evaluation over large real datasets in a database system. © 2023 IEEE.

Published
2023

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