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Temporal alignment

Anton Dignös, Michael H. Böhlen, Johann Gamper
2012 Proceedings of the 2012 international conference on Management of Data - SIGMOD '12  
We introduce two temporal primitives, temporal splitter and temporal aligner, and define rules that use these primitives to reduce the operators of a temporal algebra to their nontemporal counterparts.  ...  In order to process interval timestamped data, the sequenced semantics has been proposed.  ...  In the query processing sequence transformations between these nodes were implemented: SQL query parser −→ parse tree analyzer −→ query tree optimizer −→ plan tree executor −→ execution tree.  ... 
doi:10.1145/2213836.2213886 dblp:conf/sigmod/DignosBG12 fatcat:aotwgszbbrgk3ik5fnpzl2ehva

Extending the Kernel of a Relational DBMS with Comprehensive Support for Sequenced Temporal Queries

Anton Dignös, Michael H. Böhlen, Johann Gamper, Christian S. Jensen
2016 ACM Transactions on Database Systems  
By providing a set of reduction rules, we can transform any temporal query, expressed in terms of temporal relational operators, to a query expressed in terms of relational operators and the two new operators  ...  By providing a set of reduction rules, we can transform any temporal query, expressed in terms of temporal relational operators, to a query expressed in terms of relational operators and the two new operators  ...  ACKNOWLEDGMENTS We thank Peter Moser for his help in implementing the extensions in PostgreSQL.  ... 
doi:10.1145/2967608 fatcat:6hvioaktwfhl7j7wmls5lxupem

Database Technology for Processing Temporal Data (Invited Paper)

Michael H. Böhlen, Anton Dignös, Johann Gamper, Christian S. Jensen, Michael Wagner
2018 International Symposium/Workshop on Temporal Representation and Reasoning  
of existing query optimization and evaluation technologies.  ...  New challenges for processing temporal data arise with multiple dimensions of time and the increasing amounts of data, including time series data that represent a special kind of temporal data.  ...  This strategy renders it possible to fully leverage the query optimization and evaluation engine of a DBMS for sequenced temporal query processing.  ... 
doi:10.4230/lipics.time.2018.2 dblp:conf/time/BohlenDGJ18 fatcat:j3kfsfijijfi7o6wpsytjbnw7u

Optique: Towards OBDA Systems for Industry [chapter]

Evgeny Kharlamov, Ernesto Jiménez-Ruiz, Dmitriy Zheleznyakov, Dimitris Bilidas, Martin Giese, Peter Haase, Ian Horrocks, Herald Kllapi, Manolis Koubarakis, Özgür Özçep, Mariano Rodríguez-Muro, Riccardo Rosati (+4 others)
2013 Lecture Notes in Computer Science  
Roshchin, and D. Fabio Savo for insightful discussions. The authors are supported by the EU project Optique (FP7-IP-318338).  ...  The query language that the system should provide to end-users should combine (i) temporal operators, that address the time dimension of data and allow to retrieve data which was true "always" in the past  ...  , (iii) query answering, and (iv) processing and analytics of streaming and temporal data.  ... 
doi:10.1007/978-3-642-41242-4_11 fatcat:axcmbjydbzfnth7f4gzl22dpky

Complex Patten Processing in Spatio-temporal Databases

Yang Zheng, Annies Ductan, Devin Thomas, Mohamed Y. Eltabakh
2014 Proceedings of 3rd International Conference on Data Management Technologies and Applications  
STEPQ enables full-fledged and optimized integration between spatiotemporal queries and complex event processing (CEP).  ...  In this paper, we present the STEPQ system, which is an extensible spatio-temporal query engine for complex pattern processing over spatio-temporal data.  ...  In Example 1, the query involves several spatiotemporal range queries, time-based correlation among the queries' results, and persistency semantics, e.g., the criminal should stay in the school area for  ... 
doi:10.5220/0004992401570169 dblp:conf/data/ZhengDTE14 fatcat:xvjadll4wvdn5au3jjr5luid5y

MAC: Mining Activity Concepts for Language-based Temporal Localization [article]

Runzhou Ge, Jiyang Gao, Kan Chen, Ram Nevatia
2018 arXiv   pre-print
in videos and queries.  ...  We address the problem of language-based temporal localization in untrimmed videos.  ...  Acknowledgements This research was supported, in part, by the Office of Naval Research under grant N00014-18-1-2050 and by an Amazon Research Award.  ... 
arXiv:1811.08925v1 fatcat:azp2vhcjfzbnblt46eobznihh4

Few-shot Action Recognition with Implicit Temporal Alignment and Pair Similarity Optimization [article]

Congqi Cao, Yajuan Li, Qinyi Lv, Peng Wang, Yanning Zhang
2020 arXiv   pre-print
wide variations and misalignment of temporal sequences make the video-level similarity comparison difficult; 3) the scarcity of labeled data makes the optimization difficult.  ...  Although there has been a lot of work in this area recently, most of the existing work is based on image classification tasks.  ...  And then the implicit alignment module is used to align a given query video with the support videos semantically at video-level.  ... 
arXiv:2010.06215v1 fatcat:hhchjwegsjfkxnpv4xoykxy5vu

Diachronic Cross-modal Embeddings

David Semedo, Joao Magalhaes
2019 Proceedings of the 27th ACM International Conference on Multimedia - MM '19  
structuring constraints based on a temporal alignment window.  ...  This paper introduces a novel diachronic cross-modal embedding (DCM), where cross-modal correlations are represented in embedding space, throughout the temporal dimension, preserving semantic similarity  ...  In [14] temporal clues were used to improve search relevance at query time, by modelling content streams using a multi-task regression on multivariate point processes. In Uricchio et al.  ... 
doi:10.1145/3343031.3351036 dblp:conf/mm/SemedoM19a fatcat:sv6uekobmbfxteqybxt6tnv26i

Reinforcement Learning for Weakly Supervised Temporal Grounding of Natural Language in Untrimmed Videos [article]

Jie Wu, Guanbin Li, Xiaoguang Han, Liang Lin
2020 arXiv   pre-print
As it is non-trivial to obtain a straightforward reward function in the absence of pairwise granular boundary-query annotations, a cross-modal alignment evaluator is crafted to measure the alignment degree  ...  In this paper, we propose a Boundary Adaptive Refinement (BAR) framework that resorts to reinforcement learning (RL) to guide the process of progressively refining the temporal boundary.  ...  Temporal grounding of natural language aims to determine the start and end time of a temporal segment in an untrimmed video that corresponds to a language query.  ... 
arXiv:2009.08614v1 fatcat:kbb5c5y2bjbhhjvfrgrnotkkla

Coarse-to-fine Semantic Localization with HD Map for Autonomous Driving in Structural Scenes [article]

Chengcheng Guo, Minjie Lin, Heyang Guo, Pengpeng Liang, Erkang Cheng
2021 arXiv   pre-print
In tracking stage, vehicle pose is refined by implicitly aligning the semantic segmentation result between image and landmarks in HD maps with photometric consistency.  ...  To this end, we formulate vision-based localization as a data association problem that maps visual semantics to landmarks in HD map.  ...  Localization accuracy evaluations of several data sequences are reported in module time(ms) image post-process 6.24 map query 0.73 pose optimization 1.76 pose search 0.60 total track time 12.05  ... 
arXiv:2107.02557v1 fatcat:fzloh5lyufebhaoo5sfezoaqlu

Temporal Data Management – An Overview [chapter]

Michael H. Böhlen, Anton Dignös, Johann Gamper, Christian S. Jensen
2018 Lecture Notes in Business Information Processing  
optimization and indexing of DBMS can be used Break timestamps into pieces that are aligned Then, equality on aligned timestamps can be used Two primitives are required: Temporal Normalizer: for operators  ...  Gamper eBISS 2017 -July 3, 2017 27 Background in Temporal Databases Strong Interval-Based Data Models Intervals are atomic units (and not just sets of time points) and carry meaning/semantics  ...  Timestamps must be adjusted for the result Some values must be scaled to the adjusted timestamps Constructing Temporal Algebra Expressions Query: Temporal aggregation Input: Jul] Answer: ϑ T MAX (X  ... 
doi:10.1007/978-3-319-96655-7_3 fatcat:tt3jp2tmgjbrjpyrzcrn2zwekm

Dynamic Word Embeddings for Evolving Semantic Discovery

Zijun Yao, Yifan Sun, Weicong Ding, Nikhil Rao, Hui Xiong
2018 Proceedings of the Eleventh ACM International Conference on Web Search and Data Mining - WSDM '18  
both semantic accuracy and alignment quality.  ...  In this paper, we develop a dynamic statistical model to learn time-aware word vector representation.  ...  of embeddings is built into the optimization process and involves embeddings across time slices simultaneously, the quality of alignment is be er than post-learning alignments that only consider two time  ... 
doi:10.1145/3159652.3159703 dblp:conf/wsdm/YaoSDRX18 fatcat:yeeygsqt2raijkci7gvk5l3wya

Learning Commonsense-aware Moment-Text Alignment for Fast Video Temporal Grounding [article]

Ziyue Wu, Junyu Gao, Shucheng Huang, Changsheng Xu
2022 arXiv   pre-print
Grounding temporal video segments described in natural language queries effectively and efficiently is a crucial capability needed in vision-and-language fields.  ...  Finally, to maintain the original semantic information of textual queries, a cross-modal complementary common space is optimized to obtain matching scores for performing FVTG.  ...  [2] propose a Semantic Conditioned Dynamic Modulation (SCDM), which can dynamically adjust the temporal convolution according to the query semantics, and integrate the query with visual representations  ... 
arXiv:2204.01450v2 fatcat:2jgrim33szerhbggwpkayiuzta

Weakly-Supervised Video Moment Retrieval via Semantic Completion Network

Zhijie Lin, Zhou Zhao, Zhu Zhang, Qi Wang, Huasheng Liu
Existing methods are mostly trained in a fully-supervised setting, which requires the full annotations of temporal boundary for each query.  ...  Next, we build a semantic completion module to measure the semantic similarity between the selected proposals and query, compute reward and provide feedbacks to the proposal generation module for scoring  ...  Acknowledgements This work is supported by the National Natural Science Foundation of China under Grant No.61602405, No.U1611461, No.61751209 and No.61836002, China  ... 
doi:10.1609/aaai.v34i07.6820 fatcat:zveh5blsg5ehvapv2aes7unvye

Information-centric industrial Internet of Things: Service model

Yang Wang, Peng Zeng, Xu Wang, Yangyu Zhang, Fangjun Kuang, Baohui Zhu
2012 2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems  
Through the optimal composition of elementary services, decentralized applications are implemented in the service-oriented architecture.  ...  Knowledge and services are defined and formulated using ontology models in a modeling layer.  ...  The query engine queries real-time data in terms of ontology-based semantic contexts from the perception layer (Fig. 2) .  ... 
doi:10.1109/ccis.2012.6664557 dblp:conf/ccis/WangZWZKZ12 fatcat:jrgmrfdyyvgu7fntv5vxek2gmu
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