Author Search Result

[Author] Songfeng LU(3hit)

1-3hit
  • A New Algorithm for Fused Blocked Pattern Matching

    Hua ZHAO  Songfeng LU  Yan LIU  

     
    LETTER-Algorithms and Data Structures

      Vol:
    E96-A No:4
      Page(s):
    830-832

    Fused Blocked Pattern Matching is a kind of approximate matching based on Blocked Pattern Matching, and can be used in identification of fused peptides in tumor genomes. In this paper, we propose a new algorithm for fused blocked pattern matching. We give a comparison between Julio's solution and ours, which shows our algorithm is more efficient.

  • Indexed Swap Matching for Short Patterns

    Hua ZHAO  Songfeng LU  

     
    PAPER-Algorithms and Data Structures

      Vol:
    E95-A No:1
      Page(s):
    362-366

    Let T be a text of length n and P be a pattern of length m, both strings over a fixed finite alphabet. The Pattern Matching with Swaps problem is to find all occurrences of P in T if adjacent pattern characters can be swapped. In the Approximate Pattern Matching problem with Swaps, one seeks for every text location with a swapped match of P, the number of swaps necessary to obtain a match at the location. In this paper we provide the first off-line solution for the swap matching problem and the approximate pattern matching problem with swaps. We present a new data-structure called a Swap-transforming Tree. And we give a precise upper-bond of the number of the swapped versions of a pattern. By using the swap-transforming tree, we can solve both problems in time O(λmlog2 n) on an O(nHk) bits indexing data structure. Here λ is a constant. Our solution is more effective when the pattern is short.

  • Approach for Constructing Public Key Encryption with Multi-Dimensional Range Query

    Yu ZHANG  Songfeng LU  Hua ZHAO  

     
    LETTER-Cryptography and Information Security

      Vol:
    E98-A No:2
      Page(s):
    754-757

    Up until now, the best public key encryption with multi-dimensional range query (PKMDRQ) scheme has two problems which need to be resolved. One is that the scheme is selectively secure. The other is that the time of decryption is long. To address these problems, we present a method of converting a predicate encryption supporting inner product (IPE) scheme into a PKMDRQ scheme. By taking advantage of this approach, an instance is also proposed. The comparison between the previous work and ours shows that our scheme is more efficient over the time complexity. Moreover, our scheme is adaptively secure.

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