A multi-level hierarchical index structure for supporting efficient similarity search on tag sets

Author(s):  
Jia-Ling Koh ◽  
Nonhlanhla Shongwe ◽  
Chung-Wen Cho
Author(s):  
Rahul Malik ◽  
Sangkyum Kim ◽  
Xin Jin ◽  
Chandrasekar Ramachandran ◽  
Jiawei Han ◽  
...  

2003 ◽  
Vol 03 (01) ◽  
pp. 3-29
Author(s):  
CHRISTIAN A. LANG ◽  
AMBUJ K. SINGH

The performance of nearest neighbor (NN) queries degrades noticeably with increasing dimensionality of the data due to reduced selectivity of high-dimensional data and an increased number of seek operations during NN-query execution. If the NN-radii would be known in advance, the disk accesses could be reordered such that seek operations are minimized. We therefore propose a new way of estimating the NN-radius based on the fractal dimensionality and sampling. It is applicable to any page-based index structure. We show that the estimation error is considerably lower than for previous approaches. In the second part of the paper, we present two applications of this technique. We show how the radius estimations can be used to transform k-NN queries into at most two range queries, and how it can be used to reduce the number of page reads during all-NN queries. In both cases, we observe significant speedups over traditional techniques for synthetic and real-world data.


2006 ◽  
Vol 05 (03) ◽  
pp. 193-210 ◽  
Author(s):  
Balakrishnan Ramadoss ◽  
Kannan Rajkumar

Dance videos are interesting and semantics-intensive. At the same time, they are complex type of videos, when compared to all other types such as sports, news and movie videos. In fact, dance video is the one which is less explored by the researchers across the globe. This paper presents a dance video data model to represent the semantics of the dance videos with different granularity levels, identified by the components of the accompanying song. Secondly, the paper proposes a multi-level index structure to efficiently handle containment, temporal, spatial and spatiotemporal query types. Moreover, the index structure has been designed to consider the queries with different levels of constraints. Finally, the paper presents the experimental results depicting the performance of different types of dance video queries.


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