Ishtiaq Ahmad

Publications

• 4.93

  Impact points

  A high-throughput processing service for retention time alignment of complex proteomics and metabolomics LC-MS data.

  Isthiaq Ahmad, Frank Suits, Berend Hoekman, Morris A Swertz, Heorhiy Byelas, Martijn Dijkstra, Rob Hooft, Dmitry Katsubo, Bas van Breukelen, Rainer Bischoff, Peter Horvatovich

  Bioinformatics (Oxford, England). 02/2011; 27(8):1176-8.

  Warp2D is a novel time alignment approach, which uses the overlapping peak volume of the reference and sample peak lists to correct misleading peak shifts. Here, we present an easy-to-use web interface for high-throughput Warp2D batch processing time alignment service using the Dutch Life Science Gr... [more] Warp2D is a novel time alignment approach, which uses the overlapping peak volume of the reference and sample peak lists to correct misleading peak shifts. Here, we present an easy-to-use web interface for high-throughput Warp2D batch processing time alignment service using the Dutch Life Science Grid, reducing processing time from days to hours. This service provides the warping function, the sample chromatogram peak list with adjusted retention times and normalized quality scores based on the sum of overlapping peak volume of all peaks. Heat maps before and after time alignment are created from the arithmetic mean of the sum of overlapping peak area rearranged with hierarchical clustering, allowing the quality control of the time alignment procedure. Taverna workflow and command line tool are provided for remote processing of local user data. AVAILABILITY: online data processing service is available at http://www.nbpp.nl/warp2d.html. Taverna workflow is available at myExperiment with title '2D Time Alignment-Webservice and Workflow' at http://www.myexperiment.org/workflows/1283.html. Command line tool is available at http://www.nbpp.nl/Warp2D_commandline.zip. CONTACT: p.l.horvatovich@rug.nl SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.

• A high-throughput processing service for retention time alignment of complex proteomics and metabolomics LC-MS data.

  Isthiaq Ahmad, Frank Suits, Berend Hoekman, Morris A. Swertz, Heorhiy Byelas, Martijn Dijkstra, Rob W. W. Hooft, Dmitry Katsubo, Bas van Breukelen, Rainer Bischoff, Peter Horvatovich

  Bioinformatics. 01/2011; 27:1176-1178.
• 0.37

  Impact points

  Digital Text Watermarking: Secure Content Delivery and Data Hiding in Digital Documents

  M.A. Qadir, I. Ahmad

  Aerospace and Electronic Systems Magazine, IEEE. 12/2006;

  Secure communication of data over public channels is one of the most important challenges. Both the activities to secure contents and to break security are very hot. In order to reduce the chances of attack, security needs to be made invisible. The needs to preserve originality, ownership informatio... [more] Secure communication of data over public channels is one of the most important challenges. Both the activities to secure contents and to break security are very hot. In order to reduce the chances of attack, security needs to be made invisible. The needs to preserve originality, ownership information, and integrity of text documents in a way that cannot be identified by everyone is being felt badly. Watermarking of the documents is a step toward achieving these objectives. However, to watermark a plain text document (ASCII) in a way that the original text will not change (and it would be very difficult to break it), is a great challenge. We have developed a novel encoding scheme which can be used to insert information in plain text without changing the text. A system has been developed based upon this encoding scheme. This paper describes the system and demonstrates its workings

• Secure Content Delivery and Data Hiding in Digital Documents

  M.A. Qadir, I. Ahmad

  IEEE International Carnahan Conference on Security Technology, Las Palmas de G.C., Spain; 01/2005

  Secure communication of data over public channel is one of the most important challenges. Both the activities to secure contents and to break security are very hot. In order to reduce the chances of attack, security need to be made invisible. Need to preserve originality, ownership information and i... [more] Secure communication of data over public channel is one of the most important challenges. Both the activities to secure contents and to break security are very hot. In order to reduce the chances of attack, security need to be made invisible. Need to preserve originality, ownership information and integrity of text documents in a way that cannot be identified by every one is being felt badly. Watermarking of the documents is a step towards achieving these objectives. However to watermark a plain text document (ASCII) in a way that original text is not changed and it would be very difficult to break it, is a great challenge. We have developed a novel encoding scheme, which can be used to insert information in a plain text without changing the text. A system has been developed based upon this encoding scheme. This paper describes the system and demonstrates its working.