International Journal of Advanced Computing (IJAC) Vol. 4, Issue 3 & 4, July & October 2012 ISSN : 0975-7686 International Journal of Advanced Computing (IJAC) Volume 4 Issue 3 & 4 July & October 2012 Quarterly Contents Sl.No. Title Page No. 1. Information Retrieval in Indian Languages: A Survey on Query Expansion Techniques by taking Telugu as a Case Study B.Padmaja Rani, Ramakrishna Kolikipogu 77 2. Recent Advancements In Parallel Algorithms for String Matching- A Survey and Experimental Results K Butchi Raju, Chinta Someswararao, S Viswanadha Raju 91 3. ProtoCheck: Web Application Protocol Anomaly Detection Rajendra Prasad Palnaty, Ananda Rao Akepogu 98 4. Web Application DDoS Attack Detection Systems K.V. Raghavender, P. Prem Chand 102 5. Enhanced FP-Growth Algorithms for Mining Frequent Item Sets Krishna Ranam, V.P.C.Rao 107 6. Robust Watermarking Method For Any Images Based On Noise Density 114 Syed Muneer, Sk Althaf Hussain Basha, E. Srinivasa Reddy, I. Ramesh Babu