Results 11 to 20 of about 164,582 (257)
Efficient Evaluation of Arbitrary Relational Calculus Queries [PDF]
Logical Methods in Computer Science, 2023 The relational calculus (RC) is a concise, declarative query language. However, existing RC query evaluation approaches are inefficient and often deviate from established algorithms based on finite tables used in database management systems.
Martin Raszyk +3 more
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Query processing of spatial objects: Complexity versus Redundancy [PDF]
, 1993 The management of complex spatial objects in applications, such as geography and cartography, imposes stringent new requirements on spatial database systems, in particular on efficient query processing. As shown before, the performance of spatial query
Kriegel, Hans-Peter +3 more
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A Hierarchical Spatial Network Index for Arbitrarily Distributed Spatial Objects
ISPRS International Journal of Geo-Information, 2021 The range query is one of the most important query types in spatial data processing. Geographic information systems use it to find spatial objects within a user-specified range, and it supports data mining tasks, such as density-based clustering. In many
Xiangqiang Min +3 more
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Range Query Method Based on Compressed HMAC Algorithm for Sensor Networks [PDF]
Jisuanji gongcheng, 2021 Traditional range query methods are mainly aimed at one-dimensional data, and require more uploaded information at perception nodes, resulting in high energy consumption.Therefore, a multi-dimensional data range query method for two-layer wireless sensor
HU Qiaomu, DENG Yun
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Query expansion for language modeling using sentence similarities [PDF]
, 2011 We propose a novel method of query expansion for Language Modeling (LM) in Information Retrieval (IR) based on the similarity of the query with sentences in the top ranked documents from an initial retrieval run.
Ganguly, Debasis +5 more
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Time‐specific encrypted range query with minimum leakage disclosure
IET Information Security, 2021 A time‐specific encrypted range query scheme that has the following properties is proposed. (1) The proposed scheme has trapdoor privacy and data privacy so that a semi‐honest cloud is not able to get any useful information from given ciphertexts and ...
Ozgur Oksuz
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A Secure and Efficient Privacy-Preserving Range Query Scheme in Location-Based Services
IEEE Access, 2018 With the rapid development of wireless communications and mobile devices with location capability, location-based services (LBS) have been extensively used in almost all social and business domains.
Zhisheng Huang +4 more
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STE-based encrypted relational database scheme with reduced leakages
网络与信息安全学报Recently, the concept of partially precomputed indexing for Structured query language (SQL) join (PpSj), which was predicated on structured encryption, has been introduced.
SU Yuchen, MA Changshe
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Distributed Similarity Queries in Metric Spaces
Data Science and Engineering, 2019 Similarity queries, including range queries and k nearest neighbor (kNN) queries, in metric spaces have applications in many areas such as multimedia retrieval, computational biology and location-based services.
Keyu Yang +5 more
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Privacy-Aware Fuzzy Range Query Processing Over Distributed Edge Devices [PDF]
, 2021 Range query processing is a common edge computing and service in the Internet of Things, which can extract user-interest information from distributed edge devices.
Chen, Tieming +7 more
core +1 more source