- Computing and Information Systems - Research Publications
Computing and Information Systems - Research Publications
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ItemRoleVAT: Visual Assessment of Practical Need for Role Based Access ControlZhang, D ; Ramamohanarao, K ; Versteeg, S ; Zhang, R (IEEE COMPUTER SOC, 2009)
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ItemKernel latent semantic analysis using an information retrieval based kernelPark, LAF ; Ramamohanarao, K (ACM, 2009-12-01)
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ItemThe Sensitivity of Latent Dirichlet Allocation for Information RetrievalPark, LAF ; Ramamohanarao, K ; Buntine, W ; Grobelnik, M ; Mladenic, D ; ShaweTaylor, J (SPRINGER-VERLAG BERLIN, 2009)
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ItemMining web multi-resolution community-based popularity for information retrievalPark, LAF ; Ramamohanarao, K (ACM, 2007-12-01)
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ItemPersonalized PageRank for web page prediction based on access time-length and frequencyGuo, YZ ; Rarnamohanarao, K ; Park, LAF ; Haas, LL ; Kacprzyk, J ; Motwani, R ; Broder, A ; Ho, H (IEEE COMPUTER SOC, 2007)
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ItemContinuous intersection joins over moving objectsZhang, R ; Lin, D ; Ramamohanarao, K ; Bertino, E (IEEE, 2008)
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ItemPatterns based classifiersRamamohanarao, K ; Fan, H (SPRINGER, 2007-03)
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ItemSurvey of network-based defense mechanisms countering the DoS and DDoS problemsPeng, T ; Leckie, C ; Ramamohanarao, K (ASSOC COMPUTING MACHINERY, 2007-04)This article presents a survey of denial of service attacks and the methods that have been proposed for defense against these attacks. In this survey, we analyze the design decisions in the Internet that have created the potential for denial of service attacks. We review the state-of-art mechanisms for defending against denial of service attacks, compare the strengths and weaknesses of each proposal, and discuss potential countermeasures against each defense mechanism. We conclude by highlighting opportunities for an integrated solution to solve the problem of distributed denial of service attacks.
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ItemIncremental maintenance of shortest distance and transitive closure in first-order logic and SQLPang, CY ; Dong, GZ ; Ramamohanarao, K (ASSOC COMPUTING MACHINERY, 2005-09)Given a database, the view maintenance problem is concerned with the efficient computation of the new contents of a given view when updates to the database happen. We consider the view maintenance problem for the situation when the database contains a weighted graph and the view is either the transitive closure or the answer to the all-pairs shortest-distance problem ( APSD ). We give incremental algorithms for APSD , which support both edge insertions and deletions. For transitive closure, the algorithm is applicable to a more general class of graphs than those previously explored. Our algorithms use first-order queries, along with addition (+) and less-than (<) operations ( FO (+,<)); they store O ( n 2 ) number of tuples, where n is the number of vertices, and have AC 0 data complexity for integer weights. Since FO (+,<) is a sublanguage of SQL and is supported by almost all current database systems, our maintenance algorithms are more appropriate for database applications than nondatabase query types of maintenance algorithms.
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ItemOptimized algorithms for predictive range and KNN queries on moving objectsZhang, R ; Jagadish, HV ; Dai, BT ; Ramamohanarao, K (PERGAMON-ELSEVIER SCIENCE LTD, 2010-12)