62 citations · 111 across the 20 of their papers we have counts for
20 papers
ADMUS: A Progressive Question Answering Framework Adaptable to Multiple Knowledge Sources
Yirui Zhan, Yanzeng Li, Minhao Zhang +1
With the introduction of deep learning models, semantic parsingbased knowledge base question answering (KBQA) systems have achieved high performance in handling complex questions.…
Efficient Execution of SPARQL Queries with OPTIONAL and UNION Expressions
Lei Zou, Yue Pang, M. Tamer Özsu +1
The proliferation of RDF datasets has resulted in studies focusing on optimizing SPARQL query processing. Most existing work focuses on basic graph patterns (BGPs) and ignores othe…
TopoBERT: Plug and Play Toponym Recognition Module Harnessing Fine-tuned BERT
Bing Zhou, Lei Zou, Yingjie Hu +2
Extracting precise geographical information from textual contents is crucial in a plethora of applications. For example, during hazardous events, a robust and unbiased toponym extr…
VGStore: A Multimodal Extension to SPARQL for Querying RDF Scene Graph
Yanzeng Li, Zilong Zheng, Wenjuan Han +1
Semantic Web technology has successfully facilitated many RDF models with rich data representation methods. It also has the potential ability to represent and store multimodal know…
gBuilder: A Scalable Knowledge Graph Construction System for Unstructured Corpus
Yanzeng Li, Lei Zou
We design a user-friendly and scalable knowledge graph construction (KGC) system for extracting structured knowledge from the unstructured corpus. Different from existing KGC syste…
Crake: Causal-Enhanced Table-Filler for Question Answering over Large Scale Knowledge Base
Minhao Zhang, Ruoyu Zhang, Yanzeng Li +1
Semantic parsing solves knowledge base (KB) question answering (KBQA) by composing a KB query, which generally involves node extraction (NE) and graph composition (GC) to detect an…
Deep Analysis on Subgraph Isomorphism
Li Zeng, Yan Jiang, Weixin Lu +1
Subgraph isomorphism is a well-known NP-hard problem which is widely used in many applications, such as social network analysis and knowledge graph query. Its performance is often…
Overview of the CCKS 2019 Knowledge Graph Evaluation Track: Entity, Relation, Event and QA
Xianpei Han, Zhichun Wang, Jiangtao Zhang +22
Knowledge graph models world knowledge as concepts, entities, and the relationships between them, which has been widely used in many real-world tasks. CCKS 2019 held an evaluation…
GSI: GPU-friendly Subgraph Isomorphism
Li Zeng, Lei Zou, M. Tamer Özsu +2
Subgraph isomorphism is a well-known NP-hard problem that is widely used in many applications, such as social network analysis and query over the knowledge graph. Due to the inhere…
Accelerating Partial Evaluation in Distributed SPARQL Query Evaluation
Peng Peng, Lei Zou, Runyu Guan
Partial evaluation has recently been used for processing SPARQL queries over a large resource description framework (RDF) graph in a distributed environment. However, the previous…
Dolha - an Efficient and Exact Data Structure for Streaming Graphs
Fan Zhang, Lei Zou, Li Zeng +1
A streaming graph is a graph formed by a sequence of incoming edges with time stamps. Unlike static graphs, the streaming graph is highly dynamic and time related. In the real worl…
Fast and Accurate Graph Stream Summarization
Xiangyang Gou, Lei Zou, Chenxingyu Zhao +1
A graph stream is a continuous sequence of data items, in which each item indicates an edge, including its two endpoints and edge weight. It forms a dynamic graph that changes with…
gSMat: A Scalable Sparse Matrix-based Join for SPARQL Query Processing
Xiaowang Zhang, Mingyue Zhang, Peng Peng +3
Resource Description Framework (RDF) has been widely used to represent information on the web, while SPARQL is a standard query language to manipulate RDF data. Given a SPARQL quer…
Time Constrained Continuous Subgraph Search over Streaming Graphs
Youhuan Li, Lei Zou, M. Tamer Ozsu +1
The growing popularity of dynamic applications such as social networks provides a promising way to detect valuable information in real time. Efficient analysis over high-speed data…
Keyword Search on RDF Graphs - A Query Graph Assembly Approach
Shuo Han, Lei Zou, Jeffrey Xu Yu +1
Keyword search provides ordinary users an easy-to-use interface for querying RDF data. Given the input keywords, in this paper, we study how to assemble a query graph that is to re…
MSQ-Index: A Succinct Index for Fast Graph Similarity Search
Xiaoyang Chen, Hongwei Huo, Jun Huan +1
Graph similarity search has received considerable attention in many applications, such as bioinformatics, data mining, pattern recognition, and social networks. Existing methods fo…
Computing Longest Increasing Subsequence Over Sequential Data Streams
Youhuan Li, Lei Zou, Huaming Zhang +1
In this paper, we propose a data structure, a quadruple neighbor list (QN-list, for short), to support real time queries of all longest increasing subsequence (LIS) and LIS with co…
Query Workload-based RDF Graph Fragmentation and Allocation
Peng Peng, Lei Zou, Lei Chen +1
As the volume of the RDF data becomes increasingly large, it is essential for us to design a distributed database system to manage it. For distributed RDF data design, it is quite…
On The Marriage of SPARQL and Keywords
Peng Peng, Lei Zou, Dongyan Zhao
Although SPARQL has been the predominant query language over RDF graphs, some query intentions cannot be well captured by only using SPARQL syntax. On the other hand, the keyword s…
Processing SPARQL Queries Over Distributed RDF Graphs
Peng Peng, Lei Zou, M. Tamer Özsu +2
We propose techniques for processing SPARQL queries over a large RDF graph in a distributed environment. We adopt a "partial evaluation and assembly" framework. Answering a SPARQL…