DNA??????????

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DNA??????????

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• ?? ???????????

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• Human Genome Project
• DNA??
• ????

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DNA???????

• ??DNA???????????????????
• DNA???????????

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• DNA??,??????4???A,C,G,?T????
• ?????n-gram/2L???DNA????????
• ?? n-gram/2L??n-gram inverted index???,?????????,
  ????????

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Sliding Technique
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Index Building Algorithm

• 1. Extracting 4-subsequences
• 2. Building the back-end index
• 3. Extracting 2-grams
• 4. Building the front-end index

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??back-end-index
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??front-end-index
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Cover in Query

• ????????? Q ??????? S ?cover?,??????????
• (1) Q ???? S ?????
• (2) Q ???? S ?????
• (3) Q ???? S
• (4) S ???? Q ?

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????

• ???? CPU AMD Athlon64 3000 RAM DDR 400
  2GB
• ???? Windows XP Service Pack 2 JDK
  1.5.0_09 MySQL 4.1.12a-nt NetBeans IDE 5.5

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• ????????
• ??

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DEMO