College of Liberal Arts and Sciences
Computer Science & Software Engineering

Faculty News

Zhi-Hong Chen

  1. Dr. Chen had published "The Hamiltonian Index of Graphs" in Discrete Mathematics , 309 (2009) 288-292.
  2. He was invited to give a talk on "Reduction Technique in Spanning Eulerian Graphs" and to do joint research at South China University of Technology, P.R. China from July 16-August 10, 2008.
  3. Chen had his paper "Collapsible Graphs and Reduction of Line Graphs" Discrete Math made available online October 2008.
  4. Chen had his paper "Hamilton-Connected Indices of Graphs" Discrete Math made available online July 2008.
  5. Chen was invited to present the paper "Eulerian Subgraphs and Related Problems" at the 3rd national conference on Combinatorics and Graph Theory in Shanghai, P. R. China on July 14-21, 2008.
  6. Chen presented the paper "Walks on 3-edge-connected graphs" at the International Symposium on Graph Theory and Combinatorial Algorithms held at China Academy of Mathematics and System Science, Beijing, China and joint research at South China University of Technology on July 1-July 4, 2007.
  7. In 2007, Chen published "An s-Hamiltonian Line graph problem" in Graphs and Combinatorics , 23, 241-248 (2007), 241-248 (2007).
  8. In 2006, Chen published "Spanning Eulerian subgraphs in claw-free graphs" in the Journal of Combinatorial Mathematics and Combinatorial Computing 59 (2006), 165-171.
  9. In 2006, Chen had his research published "Spanning Trails containing given edges" in Discrete Mathematics, 306 (2006) 87-98.
  10. On August 15-19, 2006, Dr. Chen presented a paper "Spanning Eulerian Subgraph with maximum degree at most 4", at the International conference on graph theory and combinatorics in NanKai  University, P. R. China.
  11. Chen's student, Wanhsin Tu presented their joint paper "Edge-connectivities for spanning trails with prescribed edges", at the 18 th Annual Undergraduate Research Conference at Butler University on April 21, 2006.
  12. From May 6 to May 26, 2004, Dr. Chen and two students, Michael Winters and Jonathan McCullough took a research trip to China. This research is about the training and education of computer science, software engineering, and IT in China. They visited South China University of Technology, JiNan University, Guangzhou University, and FuZhou university in P.R. China. This research project was funded by the Freeman Foundation.
  13. On May 13, 2004, Dr Chen gave a lecture on "Catlin Reduction Method on Spanning Eulerian Graphs" at Fuzhou university. Fuzhou, P.R. China.

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Ankur Gupta

  1. Ankur was invited to give a technical seminar at Louisiana State University in Feb. 2009. It was titled "Efficient Data Structure for Dictionary Problems".
  2. Ankur submitted for publication the paper "Online Sorting via Searching and Selection" with Butler student Anna Kispert and co-author Jon Sorenson.
  3. Ankur received a grant ($90,000) from the Arête Initiative from the University of Chicago to study "Wisdom Is Compression: Data Compression as a Mathematical Measure of Wisdom." The grant began on 1 October 2008 and will continue for two years. Ankur appears in news about this grant at and
  4. Ankur and Jon received a Holcomb Awards grant ($9,200) for studying the problem of searching and sorting unsorted numbers. This grant began on 1 May 2008 and continued for 3 months.
  5. Ankur published the paper "On Searching Compressed String Collections Cache-Obliviously" with co-authors Paolo Ferragina, Roberto Grossi, Rahul Shah, and Jeffrey Scott Vitter in the Proceedings of the ACM Conference on Principles of Database Systems (PODS), Vancouver, Canada, May 2008.
  6. Ankur presented the paper "Nearly Tight Bounds on the Encoding Length of the Burrows-Wheeler Transform" with co-authors Roberto Grossi and Jeffrey Scott Vitter, and it was published in the Proceedings of the ACM-SIAM Workshop on Analytic Algorithmics and Combinatorics (ANALCO), San Francisco, CA, January 2008.
  7. Ankur published the paper "On the Size of Succinct Indices" with co-authors Alexander Golynski, Roberto Grossi, Rajeev Raman, and Srinivasa Rao in the Proceedings of the European Symposium on Algorithms (ESA) , Eilat, Israel, October 2007.
  8. Ankur published the paper "A Framework for Dynamizing Succinct Data Structures" with co-authors Wing-Kai Hon, Rahul Shah, and Jeffrey Scott Vitter in the Proceedings of International Colloquium on Automata, Languages, and Programming (ICALP) , Wroclaw, Poland, July 2007.
  9. Ankur published the paper "Compressed Data Structures: Dictionaries and Data-Aware Measures" with co-authors Wing-Kai Hon, Rahul Shah, and Jeffrey Scott Vitter in the Theoretical Computer Science (TCS) , January 2007.

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Rahul Hardikar

  1. Rahul joined Butler University's department of Computer Science and Software Engineering in August 2008 as a Postdoctoral faculty, teaching classes in parallel scientific computing for CS and non-CS majors. He is looking for collaboration with other researchers or institutes whose emphasis is on building scientific algorithms which run on supercomputers.
  2. Graduated with Ph.D. in Applied Physics from Mississippi State University in Dec 2007. His dissertation topic was "Dynamic electron-phonon interactions in one-dimensional models".
  3. Abstract submitted at American Physical Society (APS) March Meeting 2008 : "Spin-soliton excitations from the Bond-Charge-Density Wave spin-Peierls state in the ¼-filled band" with R. Torsten Clay and Sumit Mazumdar.
  4. Abstract submitted at APS March Meeting 2008 : "Temperature dependence of charge-ordering in (TMTCF)2X, C = S, Se", with Sumit Mazumdar, R. Torsten Clay.
  5. Abstract submitted at APS March Meeting 2007: "Mixed spin-charge solitons and thermodynamics of (TMTTF)2X", with R. Torsten Clay and Sumit Mazumdar.
  6. Abstract submitted and presented at APS 2007 "Phase diagram of the one dimensional Hubbard-Holstein Model at ½ and ¼ filling ", with R. Torsten Clay and Sumit Mazumdar.
  7. Attended a Tutorial at APS March meeting 2007 on "Statistical and Thermal Physics with Interactive Computer-based Tutorials".
  8. Paper published in Physical Review B (PRB) "Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band", with R. Torsten Clay and Sumit Mazumdar in 2007.
  9. Paper published in Physical Review B, "Phase diagram of the one-dimensional Hubbard-Holstein model at half and quarter filling", with R. Torsten Clay in 2007.
  10. Presented at Mississippi Academy of Sciences (MAS) 2007 "Metallic Phases in one Dimensional molecular conductors", with R. Torsten Clay and Published in Journal of the Mississippi Academy of Sciences 2007.
  11. Invited judge at Starkville High School Science Fair in 2007.
  12. Abstract submitted in APS 2006 "Temperature dependent competition between charge-ordering and spin-Peierls transition in (TMTTF)2X: the role of quantum phonons", with R. Torsten Clay and Sumit Mazumdar.
  13. Paper published in Physical Review Letters (PRL) "Intermediate Phase of the One Dimensional Half-Filled Hubbard-Holstein Model", with R. Torsten Clay in 2005.

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Panagiotis K. Linos

  1. Dr. Linos attended the Indiana University Workshop on "Visualization and Service-Oriented Architectures", University Place Conference Center, March 28, 2008.
  2. Panos served on the Advisory Council of the Assistance League of Indianapolis; a nation-wide not-for-profit organization (see ). Duties include participation in various meetings, provide IT consultation and engage our students in related projects (2007-2009).
  3. He initiated (with Ken Creech, Media Arts) a new EPICS project with the WFYI-PBS station of Indianapolis (see ) in Spring 2008.
  4. Panos published and presented a paper with Butler students entitled "A Metrics Tool for Multi-language Software", Linos, P., Lucas, W., Myers, S. and Maier, Z., in the Proceedings of the IASTED International Conference on Software Engineering and Applications, November 19-21, 2007, Cambridge, Massachusetts, USA, ISBN: 978-0-88986-705-5, pp. 324-329.
  5. Panos was awarded a HAC research grant entitled "A Toolset for Analyzing Multi-language Software Legacy Applications" Spring 2007 ($9,500)
  6. He participated in the first consulting project of the BBA (Butler Business Accelerator) program. His role was mainly to conduct a strategic evaluation and health assessment of a real client's IT infrastructure. Also, he was responsible to provide a list of final recommendations and to sketch a road map from the current state to a modernized future state for IT (Spring 2007).
  7. He joined a Butler group in a trip to Michigan to visit the Steelcase Corporation as part of a university-wide effort to modernize our laboratory space and equipment on our campus (Dec. 2007).
  8. Panos engaged in an international effort led by MIT on Project Based Learning. As a result an invitation was extended to me and Dr. Sorenson to participate in a by-invitation-only symposium to share our experiences with our EPICS program at Butler University (Spring 2006).
  9. Dr. Linos served as a regular reviewer/referee for various professional events including: ICSM (International Conference on Software Maintenance), ICPC (International Conference on Program Comprehension), ICSOFT (International Conference on Software and Data Technologies), CSMR (European Conference on Software Maintenance and Reengineering) and others.
  10. Panos served under regular conference organization roles including: Steering Committee member for ICSM, ICPC, Program Committe Member for ICSOFT, CSMR and others.
  11. Panos served as a Guest Editor for the IEEE Transactions on Software Engineering, Special Issue on Software Maintenance and Evolution published in Vol. 31, No. 10, October 2005.
  12. Panos Linos presented a joined paper (with Jon Sorenson) entitled "EPICS: A Service Learning Program at Butler University" at the Frontiers of Education Conference (FIE), Indianapolis, Indiana, October 19-22, 2005.
  13. Prof. Linos attended the NSF Workshop on Teaching Software Testing at the Florida Institute of Technology during February 3-6, 2005 in Melbourne Florida.
  14. He received a HAC research grant entitled "Measuring the Complexity of Multi-language Software in the .NET Environment" 2005-06 ($7,600).
  15. He gave an invited talk entitled "The Challenge of Maintaining Multi-language Multi-paradigm Software", in the Computer Science department at Wayne State University, Detroit, Michigan on January 20, 2005 as part of their Computing Colloquium Series.
  16. Prof. Linos gave an invited talk entitled "A Research Framework for Software Analysis and Visualization Tools", in the Computer Science department at IUPUI, Indianapolis on January 28, 2005.

Dr. Panagiotis K. Linos' Website

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Jon Sorenson

  1. Jon served on the thesis committee for Nichole Pitcher, a student of Daniel J. Bernstein, at the University of Illinois at Chicago. Her thesis defense was on January 9th 2009.
  2. Together with Ankur Gupta and Butler student Anna Kispert, Jon has co-authored an article on "Online Sorting via Searching and Selection", which has been submitted for publication. We have a grant from the Holcomb Awards Committee to support this work.
  3. The paper "Computing Prime Harmonic Sums", with Eric Bach (U. Wisconsin) and Dominic Klyve (Carthage), had been accepted for publication in Mathematics of Computation.
  4. Jon attended the 8th Algorithmic Number Theory Symposium (ANTS-8), May 17-22, at the Banff Center in Banff, Alberta, Canada. He served as a conference co-organizer, organized the poster session (Poster Abstracts, ANTS-8, SIGSAM Bulletin 164,2:48-66, 2008) and obtained travel grants for participants. (National Security Agency, $10,500, and with co-PI Joshua Holden (Rose-Hulman), National Science Foundation, $10,600) Butler University was an official sponsoring organization.
  5. With Daniel J. Bernstein (UIC), Jon co-authored the paper "Modular Exponentiation via the Explicit Chinese Remainder Theorem", Mathematics of Computation 76,257:443-454, 2007.
  6. To learn more about supercomputing, Jon attended the Linux Clusters Institute (LCI) Supercomputing Conference , South Lake Tahoe California, May 14-17, 2007.
  7. Jon was the LAS Natural Sciences Faculty Member of the Year in 2007.
  8. Jon nearly lost his sanity by serving as the Interim Department Chair, Mathematics and Actuarial Science Department, for the 2006-2007 academic year, in addition to chairing CSSE.
  9. Jon will present two papers ("The Pseudosquares Prime Sieve" and "Fast Bounds on the Distribution of Smooth Numbers" with Scott Parsell) and one poster ("Computing Prime Harmonic Sums" with Eric Bach of UW-Madison) at ANTS VII in Berlin, Germany, July 23-28, 2006.
  10. Jon is co-organizer, with Scott Parsell (Mathematics and Actuarial Science) of a Special Session on Number Theory at the AMS Sectional Meeting at Notre Dame, April 8-9, 2006.
  11. Jon will give three lectures at the Summer School on "Computational Number Theory and Applications to Cryptography" at the University of Wyoming , June 19-23, 2006.
  12. Jon participated in a Number Theory Inspired by Cryptography workshop at the Banff International Research Station, Alberta Canada, November 5-10, 2005; Jon gave a talk on "Fast algorithms for bounding the distribution of smooth integers" there on November 7th.
  13. The paper "An Honors Course on Alan Turing" was published in ACM SIGCSE Bulletin Inroads, volume 37, number 4, December 2005, pages 103-106.
  14. The paper "EPICS: A Service Learning Program at Butler University", coauthored by Jon and Panos Linos, was presented by Panos at the IEEE Frontiers in Education conference on October 21st, 2005, in Indianapolis.
  15. The paper "Modular exponentiation via the explicit Chinese remainder theorem" coauthored by Daniel J. Bernstein (UIC) and Jon, was accepted for publication in Mathematics of Computation. (See here the list of accepted papers .) It should appear in print sometime in 2006 or 2007.
  16. Jon gave invited talks on "The Pseudosquares Prime Number Sieve" at both the Centre for Information Security and Cryptography at the University of Calgary on March 18th, 2005, and the University of Wisconsin on May 23rd, 2005.

Jon Sorenson's Website

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