23 Result(s)

Chapter and Conference Paper

Discovering Temporal Patterns for Interval-based Events

In many daily transactions, the time when an event takes place is known and stored in databases. Examples range from sales records, stock exchange, patient records, to scientific databases in geophysics and as...

Po-shan Kam, Ada Wai-chee Fu in Data Warehousing and Knowledge Discovery (2000)

Article

Dynamic vp-tree indexing for n-nearest neighbor search given pair-wise distances

Ada Wai-chee Fu, Polly Mei-shuen Chan, Yin-Ling Cheung, Yiu Sang Moon in The VLDB Journal (2000)

Article

Diamond Quorum Consensus for High Capacity and Efficiency in a Replicated Database System

Many quorum consensus protocols have been proposed for the management of replicated data in a distributed environment. The advantages of a replicated database system over a non-replicated one include high avai...

Ada Wai-Chee Fu, Yat Sheung Wong, Man Hon Wong in Distributed and Parallel Databases (2000)

Chapter and Conference Paper

Enhancing Effectiveness of Outlier Detections for Low Density Patterns

Outlier detection is concerned with discovering exceptional behaviors of objects in data sets. It is becoming a growingly useful tool in applications such as credit card fraud detection, discovering criminal b...

Jian Tang, Zhixiang Chen, Ada Wai-chee Fu… in Advances in Knowledge Discovery and Data M… (2002)

Chapter and Conference Paper

Optimal Algorithms for Finding User Access Sessions from Very Large Web Logs

Although efficient identification of user access sessions from very large web logs is an unavoidable data preparation task for the success of higher level web log mining, little attention has been paid to algo...

Zhixiang Chen, Ada Wai-Chee Fu… in Advances in Knowledge Discovery and Data M… (2002)

Chapter and Conference Paper

Mining Frequent Episodes for Relating Financial Events and Stock Trends

It is expected that stock prices can be affected by the local and overseas political and economic events. We extract events from the financial news of Chinese local newspapers which are available on the web, t...

Anny Ng, Ada Wai-chee Fu in Advances in Knowledge Discovery and Data Mining (2003)

Article

Optimal Algorithms for Finding User Access Sessions from Very Large Web Logs

Although efficient identification of user access sessions from very large web logs is an unavoidable data preparation task for the success of higher level web log mining, little attention has been paid to algo...

Zhixiang Chen, Ada Wai-Chee Fu, Frank Chi-Hung Tong in World Wide Web (2003)

Chapter and Conference Paper

ISM: Item Selection for Marketing with Cross-Selling Considerations

Many different algorithms are studied on association rules in the literature of data mining. Some researchers are now focusing on the application of association rules. In this paper, we will study one of the a...

Raymond Chi-Wing Wong, Ada Wai-Chee Fu in Advances in Knowledge Discovery and Data Mining (2004)

Chapter and Conference Paper

Finding Time Series Discords Based on Haar Transform

The problem of finding anomaly has received much attention recently. However, most of the anomaly detection algorithms depend on an explicit definition of anomaly, which may be impossible to elicit from a doma...

Ada Wai-chee Fu, Oscar Tat-Wing Leung… in Advanced Data Mining and Applications (2006)

Chapter and Conference Paper

Achieving k-Anonymity by Clustering in Attribute Hierarchical Structures

Individual privacy will be at risk if a published data set is not properly de-identified. k-anonymity is a major technique to de-identify a data set. A more general view of k-anonymity is clustering with a constr...

Jiuyong Li, Raymond Chi-Wing Wong… in Data Warehousing and Knowledge Discovery (2006)

Chapter and Conference Paper

Clustering Massive Text Data Streams by Semantic Smoothing Model

Clustering text data streams is an important issue in data mining community and has a number of applications such as news group filtering, text crawling, document organization and topic detection and tracing e...

Yubao Liu, Jiarong Cai, Jian Yin, Ada Wai-Chee Fu in Advanced Data Mining and Applications (2007)

Chapter

Privacy-Preserving Data Stream Classification

In a wide range of applications, multiple data streams need to be examined together in order to discover trends or patterns existing across several data streams. One common practice is to redirect all data str...

Yabo Xu, Ke Wang, Ada Wai-Chee Fu, Rong She, Jian Pei in Privacy-Preserving Data Mining (2008)

Article

Scaling and time war** in time series querying

The last few years have seen an increasing understanding that dynamic time war** (DTW), a technique that allows local flexibility in aligning time series, is superior to the ubiquitous Euclidean distance for...

Ada Wai-Chee Fu, Eamonn Keogh, Leo Yung Hang Lau… in The VLDB Journal (2008)

Reference Work Entry In depth

Query by Humming

Yingyi Bu, Raymond Chi-Wing Wong, Ada Wai-Chee Fu in Encyclopedia of Database Systems (2009)

Chapter and Conference Paper

Mining N-most Interesting Itemsets

Previous methods on mining association rules require users to input a minimum support threshold. However, there can be too many or too few resulting rules if the threshold is set inappropriately. It is difficu...

Ada Wai-chee Fu, Renfrew Wang-wai Kwong, Jian Tang in Foundations of Intelligent Systems (2010)

Article

Fast graph query processing with a low-cost index

This paper studies the problem of processing supergraph queries, that is, given a database containing a set of graphs, find all the graphs in the database of which the query graph is a supergraph. Existing works ...

James Cheng, Yi** Ke, Ada Wai-Chee Fu, Jeffrey Xu Yu in The VLDB Journal (2011)

Article

Maximizing bichromatic reverse nearest neighbor for L _p -norm in two- and three-dimensional spaces

Bichromatic reverse nearest neighbor (BRNN) has been extensively studied in spatial database literature. In this paper, we study a related problem called MaxBRNN: find an optimal region that maximizes the size...

Raymond Chi-Wing Wong, M. Tamer Özsu, Ada Wai-Chee Fu, Philip S. Yu… in The VLDB Journal (2011)

Article

STAIRS: Towards efficient full-text filtering and dissemination in DHT environments

Nowadays “live” content, such as weblog, wikipedia, and news, is ubiquitous in the Internet. Providing users with relevant content in a timely manner becomes a challenging problem. Differing from Web search te...

Weixiong Rao, Lei Chen, Ada Wai-Chee Fu in The VLDB Journal (2011)

Chapter and Conference Paper

Community Based Information Dissemination

Given a social network, we study the problem of finding \(k\) seeds that maximize the dissemination of information. B...

Zhengwei Yang, Ada Wai-Chee Fu, Yanyan Xu, Silu Huang… in Databases Theory and Applications (2015)