Computer Science and Information Technology have been playing more and more important roles in human life, and their applications have been deep-going almost all fields of today society. As with previous industrial revolution, Computer Science and Information Technology revolution stems from the current major innovation in science and technology, promotes the tremendous progress to world productive forces, and promotes the new stage of modern human civilization. The greater and greater demands of human civilization and society progress have been giving the special more giant feedback acting force to develop both Compute Science and Information Technology.
    Organized by International Information Technology and Applications Association (IITAA), “International Forum on Information Technology and Applications (IFITA)” and “International Forum on Computer Science-Technology and Applications (IFITA)” were successfully held annually since 2009, which aimed to supply the scholar interchange platforms for the researchers all over the world. Some researches and findings in Computer Science, Information Technology and their applications are selected here:
    “A Fast and Efficient Algorithm for Finding Frequent Items over Data Stream” presented a fast and efficient algorithm called λ-Count for computing frequency counts over a user specified threshold on a data stream.
    “An Improved PSO Algorithm with Object-Oriented Performance Database for Flight Trajectory Optimization” gave an improved particle swarm optimization algorithm with object-oriented performance database.
    “A Novel Strategy for Mining Frequent Closed Itemsets in Data Streams” presented an algorithm Stream_FCI for mining the frequent closed itemsets from data streams in the model of sliding window

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