 | Cliff ShafferProfessor
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Research Interests
Clifford A. Shaffer is a professor in the Department of Computer Science at Virginia Tech. His research interests include Computational Biology, Algorithm Visualization, Digital Education, Visualization, Spatial Data Structures, Algorithm Design and Analysis, and Data Structures. Dr. Shaffer received his PhD from University of Maryland, College Park.
He is a senior member of the ACM, senior member of the IEEE, and member of the American Society for Engineering Education. He serves on the editorial boards for Simulation, AACE Journal of Interactive Learning Research, AACE Journal of Computers in Mathematics and Science Teaching, and International Journal of Computational Science.
Algorithm Visualization Research GroupURL: http://algoviz.cs.vt.edu The Algorithm Visualization Research Group seeks to understand all aspects of algorithm visualization as it applies to supporting the understanding of algorithms for teaching and research. Primary activities include support for an emerging community of users and developers of Algorithm Visualizations (AVs) through the AlgoViz Wiki (algoviz.cs.vt.edu); development of exemplary AVs (research.cs.vt.edu/algoviz/), and pedagogical research aimed at a deep understanding of how to make Algorithm Visualization successful in teaching and learning. | |
Laboratory for Advanced Scientific Computing and ApplicationsURL: http://research.cs.vt.edu/~lasca/ The goal of the Laboratory for Advanced Scientific Computing and Applications (LASCA) is to provide expertise and leadership in high-end scientific computing research and education at Virginia Tech. Located in Torgersen Hall, the laboratory is a visible and strategic center of activity in applied high-computation and assist scientists and engineers in applying high-end computing resources to their problems. By bringing together experts in scientific cp\omputing and its applications, LASCA helps build the kind of multidisciplinary teams needed to address today's most challenging computational science problems. |
2013
Gehringer, E. F., B. L. Golub, R. Cohen, D. M. Arnow, and C. A. Shaffer,
"Panel: Textbook pricing, present and future",
Proceeding of the 44th ACM technical symposium on Computer science education - SIGCSE '13, Denver, Colorado, USA, ACM Press, pp. 633, 2013.
Fouh, E., D. Breakiron, M. Elshehaly, S. T. Hall, V. Karavirta, and C. A. Shaffer,
"OpenDSA: Using an active eTextbook to teach data structures and algorithms (abstract only)",
Proceeding of the 44th ACM technical symposium on Computer science education - SIGCSE '13, Denver, Colorado, USA, ACM Press, pp. 734, 2013.
2012
Akbar, M., C. A. Shaffer, and E. A. Fox,
"Deduced Social Networks for Educational Digital Libraries",
12th ACM/IEEE-CS Joint Conference on Digital Libraries (JCDL 2012), Washington, D.C., June 10-14, 2012.
Fouh, E., M. Sun, and C. A. Shaffer,
"OpenDSA: A Creative Commons Active-eBook",
Proceedings of the 43rd ACM technical symposium on Computer Science Education - SIGCSE '12, Raleigh, North Carolina, USA, ACM Press, pp. 721, 2012.
Fouh, E., M. Akbar, and C. A. Shaffer,
"The Role of Visualization in Computer Science Education",
Computers in the Schools, vol. 29, issue 1-2, pp. 95 - 117, 01/2012.
Shaffer, C. A.,
"Active eTextbooks for CS",
Proceedings of the 43rd ACM technical symposium on Computer Science Education - SIGCSE '12, Raleigh, North Carolina, USA, ACM Press, pp. 680, 2012.
Akbar, M., and C. A. Shaffer,
"User type clustering to refine search and browse for educational resources (abstract only)",
Proceedings of the 43rd ACM technical symposium on Computer Science Education - SIGCSE '12, Raleigh, North Carolina, USA, ACM Press, pp. 666, 2012.
2011
Shaffer, C. A., M. Akbar, A. J. D. Alon, M. Stewart, and S. H. Edwards,
"Getting algorithm visualizations into the classroom",
Proceedings of the 42nd ACM Technical Symposium on Computer Science Education - SIGCSE '11, Dallas, TX, USA, ACM Press, pp. 129, 2011.
Shaffer, C. A., T. L. Naps, and E. Fouh,
"Truly Interactive Textbooks for Computer Science Education",
Proceedings of the Sixth Program Visualization Workshop, Darmstadt, Germany, pp. 97-103, 06/2011.
Shaffer, C. A.,
Data Structures & Algorithm Analysis in Java,
, Third: Dover Publications, 2011.
Shaffer, C. A.,
Data Structures & Algorithm Analysis in C++,
, Third: Dover Publications, 2011.
Akbar, M., W. Fan, L. N. Cassel, L. Delcambre, C. A. Shaffer, E. A. Fox, and Y. Chen,
"How educators find educational resources online",
Proceedings of the 16th annual joint conference on Innovation and technology in computer science education - ITiCSE '11, Darmstadt, Germany, ACM Press, pp. 367, 2011.
Shaffer, C. A., and S. H. Edwards,
"Scheduling and student performance",
Proceedings of the 16th annual joint conference on Innovation and technology in computer science education - ITiCSE '11, Darmstadt, Germany, ACM Press, pp. 331, 2011.
Shaffer, C. A., V. Karavirta, A. Korhonen, and T. L. Naps,
"OpenDSA",
Proceedings of the 11th Koli Calling International Conference on Computing Education Research - Koli Calling '11, Koli, Finland, ACM Press, pp. 112, 2011.
Shaffer, C. A., T. L. Naps, and E. Fouh,
"Truly Interactive Textbooks for Computer Science Education",
Proceedings of the Sixth Program Visualization Workshop, Darmstadt, Germany, pp. 97-103, 2011.
Akbar, M., W. Fan, C. A. Shaffer, Y. Chen, L. N. Cassel, L. M. L. Delcambre, D. D. Garcia, G. Hislop, F. M. Shipman, R. Furuta, et al.,
"Digital Library 2.0 for Educational Resources",
Research and Advanced Technology for Digital Libraries, vol. 6966, no. 6966, Berlin, Heidelberg, Springer Berlin Heidelberg, pp. 89 - 100, 2011.
2010
Shaffer, C. A., T. L. Naps, S. H. Rodger, and S. H. Edwards,
"Building an online educational community for algorithm visualization",
Proceedings of the 41st ACM technical symposium on Computer science education, SIGCSE 2010, pp. 475-476, March, 2010.
Fox, E. A., Y. Chen, M. Akbar, C. A. Shaffer, S. H. Edwards, P. Brusilovsky, D. D. Garcia, L. M. L. Delcambre, F. Decker, D. W. Archer, et al.,
"Ensemble PDP-8: eight principles for distributed portals",
Proceedings of the 2010 Joint International Conference on Digital Libraries, JCDL 2010, Gold Coast, Queensland, Australia, ACM, pp. 341-344, 06/2010.
Randhawa, R., C. A. Shaffer, and J. J. Tyson,
"Model Composition for Macromolecular Regulatory Networks",
IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol. 7, no. 2, pp. 278-287, 2010.
Liu, Z., C. A. Shaffer, U. J. Mobassera, L. T. Watson, and Y. Cao,
"Multistate modeling and simulation for regulatory networks",
2010 Winter Simulation Conference, pp. 631-642, 2010.
Shaffer, C. A., M. L. Cooper, A. J. D. Alon, M. Akbar, M. Stewart, S. Ponce, and S. H. Edwards,
"Algorithm visualization: The state of the field",
ACM Transactions on Computing Education, vol. 10, New York, NY, USA, ACM, pp. 9:1–9:22, August, 2010.
2009
Ahn, T. - H., P. Wang, L. T. Watson, Y. Cao, C. A. Shaffer, and W. T. Baumann,
"Stochastic cell cycle modeling for budding yeast",
Proceedings of 2009 Spring Simulation Multiconference: HPC, G. Wainer, M. Chinni, P. Roman, H. Rajaei, B. Zeigler, and C. Ribbens (eds.), Soc. for Modeling Simulation Internat., San Diego, CA, SCS, pp. 569-574, 03/2009.
Randhawa, R., C. A. Shaffer, and J. J. Tyson,
"Model aggregation: a building-block approach to creating large macromolecular regulatory networks",
Bioinformatics, vol. 25, no. 24, pp. 3289-3295, 2009.
Wainer, G. A., C. A. Shaffer, R. M. McGraw, and M. J. Chinni,
"Proceedings of the 2009 Spring Simulation Multiconference, SpringSim 2009",
2009 Spring Simulation Multiconference, SpringSim 2009, San Diego, California, USA, SCS/ACM, 03/2009.
Ahn, T. - H., L. T. Watson, Y. Cao, C. A. Shaffer, and W. T. Baumann,
"Cell cycle modeling for budding yeast with stochastic simulation algorithms",
Computer Modeling in Engineering and Sciences, vol. 51, pp. 27--52, 2009.
Shaffer, C. A., J. W. Zwolak, R. Randhawa, and J. J. Tyson,
"Modeling Molecular Regulatory Networks with JigCell and PET",
Systems Biology, no. 500: Humana Press, pp. 81-111, 2009.
2008
Wang, P., R. Randhawa, C. A. Shaffer, Y. Cao, and W. T. Baumann,
"Converting Macromolecular Regulatory Models from Deterministic to Stochastic Formulation",
Proceedings of High Performance Computing and Simulation 2008 (HPCS 2008), pp. 385–392, April, 2008.
Panning, T. D., L. T. Watson, N. A. Allen, K. C. Chen, C. A. Shaffer, and J. J. Tyson,
"Deterministic parallel global parameter estimation for a model of the budding yeast cell cycle",
Journal of Global Optimization, vol. 40, no. 4, Hingham, MA, USA, Kluwer Academic Publishers, pp. 719–738, 2008.
2007
Thomas, L., C. A. Shaffer, L. Mili, and E. Thomas,
"Automated Detection of Severe Surface Defects on Barked Hardwood Logs",
Forest Product Journal, vol. 57, no. 4, pp. 50–56, April, 2007.
Thomas, E., L. Thomas, and C. A. Shaffer,
"Defect detection on hardwood logs using high resolution laser scan data",
Proceedings of the 15th International Symposium on Non-Distructive Testing of Wood, August, 2007.
Randhawa, R., C. A. Shaffer, and J. J. Tyson,
"Fusing and Composing Macromolecular Regulatory Network Models",
Proceedings of the 2007 High Performance Computing Symposium (HPC 2007), pp. 337–344, March, 2007.
Mishra, D., C. A. Shaffer, N. Ramakrishnan, L. T. Watson, K. K. Bae, J. He, A. A. Verstak, and W. H. Tranter,
"S4W: a problem-solving environment for wireless system design",
Software: Practice & Experience, vol. 37, no. 14, New York, NY, USA, John Wiley & Sons, Inc., pp. 1539–1558, 2007.
Panning, T. D., L. T. Watson, C. A. Shaffer, and J. J. Tyson,
"A Mathematical Programming Formulation for the Budding Yeast Cell Cycle",
Simulation, vol. 83, no. 7, San Diego, CA, USA, Society for Computer Simulation International, pp. 497–514, 2007.
Shaffer, C. A., M. Cooper, and S. H. Edwards,
"Algorithm visualization: a report on the state of the field",
SIGCSE '07: Proceedings of the 38th SIGCSE technical symposium on Computer science education, New York, NY, USA, ACM, pp. 150–154, 2007.
2006
Allen, N. A., K. C. Chen, C. A. Shaffer, J. J. Tyson, and L. T. Watson,
"Computer Evaluation of Network Dynamics Models with Application to Cell Cycle Control in Budding Yeast",
IEE Proceedings – Systems Biology, vol. 153, no. 1, pp. 13–21, January, 2006.
Panning, T. D., L. T. Watson, N. A. Allen, C. A. Shaffer, and J. J. Tyson,
"Deterministic Global Parameter Estimation for a Budding Yeast Model",
Proceedings of the 2006 High Performance Computing Symposium (HPC'06), pp. 195–201, 2006.
Thomas, E., L. Thomas, C. A. Shaffer, and L. Mili,
"Using External High-Resolution Log Scanning to Determine Internal Defect Characteristics",
Proceedings of the 15th Central Hardwood Forestry Conference, pp. 497–505, February, 2006.
Thomas, L., L. Mili, E. Thomas, and C. A. Shaffer,
"Defect Detection on Hardwood Logs Using Laser Scanning",
Wood and Fiber Science, vol. 38, no. 4, pp. 682–695, October, 2006.
Vass, M., C. A. Shaffer, N. Ramakrishnan, L. T. Watson, and J. J. Tyson,
"The JigCell Model Builder: A Spreadsheet Interface for Creating Biochemical Reaction Network Models",
IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol. Vol. 3, no. 2, pp. 155–164, April-June, 2006.
Sauro, H. M., D. Harel, M. Kwiatkowska, C. A. Shaffer, A. M. Uhrmacher, M. Hucka, P. Mendes, L. Strömback, and J. J. Tyson,
"Challenges for modeling and simulation methods in systems biology",
WSC '06: Proceedings of the 38th conference on Winter simulation: Winter Simulation Conference, pp. 1720–1730, 2006.
Shaffer, C. A.,
"Experiences teaching a graduate research methods course",
SIGCSE Bulletin, vol. 38, no. 2, New York, NY, USA, ACM, pp. 97–101, 2006.
Shaffer, C. A., R. Randhawa, and J. J. Tyson,
"The role of composition and aggregation in modeling macromolecular regulatory networks",
WSC '06: Proceedings of the 38th conference on Winter simulation: Winter Simulation Conference, pp. 1628–1636, 2006.
2005
Allen, N. A., C. A. Shaffer, and L. T. Watson,
"Building modeling tools that support verification, validation, and testing for the domain expert",
WSC '05: Proceedings of the 37th conference on Winter simulation: Winter Simulation Conference, pp. 419–426, 2005.
2004
He, J., M. Sosonkina, C. A. Shaffer, J. J. Tyson, L. T. Watson, J. W. Zwolak, and J. Meyer,
"A Hierarchical Parallel Scheme for a Global Search Algorithm",
Proceedings of the 2004 High Performance Computing Symposium (HPC'04): Society for Modeling and Simulation International, pp. 43–50, 2004.
Thomas, L., L. Mili, C. A. Shaffer, and E. Thomas,
"Defect Detection on Hardwood Logs Using High Resolution Three-dimensional Laser Scan Data",
IEEE International Conference on Image Processing, ICIP, pp. 243–246, October, 2004.
He, J., A. Verstak, L. T. Watson, C. A. Stinson, N. Ramakrishnan, C. A. Shaffer, T. S. Rappaport, C. R. Anderson, K. Bae, J. Jiang, et al.,
"Globally Optimal Transmitter Placement for Indoor Wireless Communication Systems",
IEEE Transactions on Wireless Communications, vol. 3, no. 6, pp. 1906–1911, November, 2004.
Vass, M., N. Allen, C. A. Shaffer, N. Ramakrishnan, L. T. Watson, and J. J. Tyson,
"The JigCell Model Builder and Run Manager",
Bioinformatics, vol. 20, no. 18, Oxford, UK, Oxford University Press, pp. 3680–3681, 2004.
Skidmore, R. R., A. Verstak, N. Ramakrishnan, T. S. Rappaport, L. T. Watson, J. He, S. Varadarajan, C. A. Shaffer, J. Chen, K. K. Bae, et al.,
"Towards integrated PSEs for wireless communications: experiences with the S4W and SitePlanner\textregistered projects",
SIGMOBILE Mob. Comput. Commun. Rev., vol. 8, no. 2, New York, NY, USA, ACM, pp. 20–34, 2004.
Shaffer, C. A.,
"Buffer pools and file processing projects for an undergraduate data structures course",
SIGCSE '04: Proceedings of the 35th SIGCSE technical symposium on Computer science education, New York, NY, USA, ACM, pp. 175–178, 2004.
Saraiya, P., C. A. Shaffer, D. S. McCrickard, and C. North,
"Effective features of algorithm visualizations",
Proceedings of the 35th SIGCSE technical symposium on Computer Science Education (SIGCSE 2004), Norfolk, Virginia, USA, pp. 382 - 386, March 2004.
2003
Rubin, E. J., C. A. Shaffer, N. Ramakrishnan, L. T. Watson, R. Dymond, D. Kibler, R. Dietz, J. Chanat, V. Lohani, D. Bosch, et al.,
"From Landscapes to Waterscapes: A PSE for Landuse Change Analysis",
Engineering with Computers, vol. 19, no. 1, pp. 9–25, July, 2003.
Allen, N. A., C. A. Shaffer, M. T. Vass, N. Ramakrishnan, and L. T. Watson,
"Improving the Development Process for Eukaryotic Cell Cycle Models with a Modeling support environment",
Simulation, vol. 79, no. 12, pp. 674–688, December, 2003.
Allen, N., L. Calzone, K. C. Chen, A. Ciliberto, N. Ramakrishnan, C. A. Shaffer, J. C. Sible, J. J. Tyson, M. Vass, L. T. Watson, et al.,
"Modeling Regulatory Networks at Virginia Tech",
Omics Journal of Integrative Biology, vol. Vol. 7, no. 3, pp. pages 285–300, Fall, 2003.
Verstak, A., N. Ramakrishnan, L. T. Watson, J. He, C. A. Shaffer, K. K. Bae, J. Jiang, W. H. Tranter, and T. S. Rappaport,
"BSML: A binding schema markup language for data interchange in problem solving environments",
Sci. Program., vol. 11, no. 3, Amsterdam, The Netherlands, The Netherlands, IOS Press, pp. 199–224, 2003.
Allen, N. A., C. A. Shaffer, M. T. Vass, N. Ramakrishnan, and L. T. Watson,
"Improving the development process for eukaryotic cell cycle models with a modeling support environment",
WSC '03: Proceedings of the 35th conference on Winter simulation: Winter Simulation Conference, pp. 782–790, 2003.
Thomas, E., L. Thomas, L. Mili, R. Ehrich, A. L. Abott, and C. A. Shaffer,
"Primary Detection of Hardwood Log Defects Using Laser Surface Scanning",
Proceedings of Machine Vision Applications in Industrial Inspection XI, Volume 5022: SPIE, pp. 39–48, January, 2003.
Dymond, R., V. Lohani, D. Kibler, D. Bosch, E. J. Rubin, R. Dietz, J. Chanat, C. Speir, C. A. Shaffer, N. Ramakrishnan, et al.,
"From landscapes to waterscapes: a PSE for landuse change analysis",
Engineering with Computers, vol. 19, pp. 9–25, 2003.
2002
Colaso, V., A. Kamal, P. Saraiya, C. North, D. S. McCrickard, and C. A. Shaffer,
"Learning and Retention in Data Structures: A Comparison of Visualization, Text, and Combined Methods",
Proc. ED-MEDIA 2002, pp. 2, 2002.
Watson, L. T., V. K. Lohani, D. F. Kibler, R. L. Dymond, N. Ramakrishnan, and C. A. Shaffer,
"Integrated Computing Environments for Watershed Management",
ASCE Journal of Computing in Civil Engineering, vol. 16, no. 4, pp. 259–268, October, 2002.
Ramakrishnan, N., L. T. Watson, D. G. Kafura, C. J. Ribbens, and C. A. Shaffer,
"Programming Environments for Multidisciplinary Grid Communities",
Concurrency and Computation: Practice and Experience, vol. 13–15, pp. 1241–1273, Nov–December, 2002.
He, J., L. T. Watson, N. Ramakrishnan, C. A. Shaffer, A. Verstak, J. Jiang, K. Bae, and W. H. Tranter,
"Dynamic Data Structures for a Direct Search Algorithm",
Comput. Optim. Appl., vol. 23, no. 1, Norwell, MA, USA, Kluwer Academic Publishers, pp. 5–25, 2002.
Vass, M., J. M. Carroll, and C. A. Shaffer,
"Supporting creativity in problem solving environments",
C&C '02: Proceedings of the 4th conference on Creativity & cognition, New York, NY, USA, ACM, pp. 31–37, 2002.
2001
Shaffer, C. A.,
A Practical Introduction to Data Structures and Algorithm Analysis,
, Second Edition, Upper Saddle River, NJ, USA, Prentice Hall PTR, 2001.
Begole, J. M. A., R. B. Smith, C. A. Struble, and C. A. Shaffer,
"Resource sharing for replicated synchronous groupware",
IEEE/ACM Transactions on Networking, vol. 9, no. 6, Piscataway, NJ, USA, IEEE Press, pp. 833–843, 2001.
Goel, A., C. A. Baker, C. A. Shaffer, B. Grossman, W. H. Mason, L. T. Watson, and R. T. Haftka,
"VizCraft: a problem solving environment for configuration design of a high speed civil transport",
Computer Science and Engineering, vol. 3, no. 1, pp. 56–66, 2001.
2000
Shaffer, C. A., L. T. Watson, D. G. Kafura, N. Ramakrishnan, and A. Tentner,
"Features of Problem Solving Environments for Computational Science",
Proceedings of the 2000 High Performance Computing Symposium (HPC'00), San Diego, CA, Society for Computer Simulation International, pp. 242–247, April 2000.
Goel, A., C. Phanouriou, F. A. Kamke, C. J. Ribbens, C. A. Shaffer, and L. T. Watson,
"WBCSim: A prototype PSE for wood-based composites simulations",
Enabling Technologies for Computational Science: Frameworks, Middleware and Environments, pp. 187-196, 2000.
1999
Begole, J. M. A., P. Isenhour, and C. A. Shaffer,
"Can You Share JavaBeans?",
Dr. Dobb's Journal, no. 300, pp. 121–122, June, 1999.
Shaffer, C. A., L. T. Watson, and D. G. Kafura,
"Component Frameworks for Problem Solving Environments in Computational Science",
Proceedings of the 1st Symposium on Reusable Architectures and Components for Developing Distributed Information Systems (RACDIS'99), pp. 653–656, August, 1999.
Goel, A., C. Baker, C. A. Shaffer, B. Grossman, R. Haftka, W. Mason, and L. T. Watson,
"VizCraft: A Multidimensional Visualization Tool for Aircraft Configuration Design",
VISUALIZATION '99: Proceedings of the 10th IEEE Visualization 1999 Conference (VIS '99), Washington, DC, USA, IEEE Computer Society, 1999.
Goel, A., C. Phanouriou, F. A. Kamke, C. J. Ribbens, C. A. Shaffer, and L. T. Watson,
"WBCSim: A Prototype Problem Solving Environment for Wood-Based Composites Simulations",
Engineering with Computers, vol. 15, no. 2, pp. 198–210, 1999.
Edwards, S. H., and C. A. Shaffer,
"An Analysis of a Course-Oriented Electronic Mailing List",
Computer Science Education, vol. 9, no. 1, pp. 8–22, April, 1999.
Begole, J. M. A., M. B. Rosson, and C. A. Shaffer,
"Flexible collaboration transparency: supporting worker independence in replicated application-sharing systems",
ACM Trans. Comput.-Hum. Interact., vol. 6, no. 2, New York, NY, USA, ACM, pp. 95–132, 1999.
1998
Begole, J. M. A., M. B. Rosson, and C. A. Shaffer,
"Supporting worker independence in collaboration transparency",
UIST '98: Proceedings of the 11th annual ACM symposium on User interface software and technology, New York, NY, USA, ACM, pp. 133–142, 1998.
Goel, A., C. Phanouriou, F. A. Kamke, C. J. Ribbens, C. A. Shaffer, and L. T. Watson,
WBCSim: A Prototype Problem Solving Environment for Wood-Based Composites Simulations,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1998.
Begole, J. M. A., and C. A. Shaffer,
Flexible Collaboration Transparency,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1998.
Shaffer, C. A.,
A practical introduction to data structures and algorithms analysis, Java edition,
, Upper Saddle River, NJ, USA, Prentice-Hall, Inc., 1998.
Koenemann, J., J. M. Carroll, C. A. Shaffer, M. B. Rosson, and M. Abrams,
Designing collaborative applications for classroom use: the LiNC project,
, San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., pp. 99–122, 1998.
Shaffer, C. A., D. L. Knill, and L. T. Watson,
"Visualization for multiparameter aircraft designs",
VIS '98: Proceedings of the conference on Visualization '98, Los Alamitos, CA, USA, IEEE Computer Society Press, pp. 491–494, 1998.
1997
Shaffer, C. A.,
A practical introduction to data structures and algorithm analysis,
, Upper Saddle River, NJ, USA, Prentice-Hall, Inc., 1997.
Begole, J. M. A., C. A. Struble, C. A. Shaffer, and R. B. Smith,
"Transparent sharing of Java applets: a replicated approach",
UIST '97: Proceedings of the 10th annual ACM symposium on User interface software and technology, New York, NY, USA, ACM, pp. 55–64, 1997.
Begole, J. M. A., C. A. Struble, and C. A. Shaffer,
"Leveraging Java Applets: Toward Collaboration Transparency in Java",
IEEE Internet Computing, vol. 1, no. 2, Piscataway, NJ, USA, IEEE Educational Activities Department, pp. 57–64, 1997.
1996
Shaffer, C. A., L. S. Heath, and J. Yang,
"Using the Swan data structure visualization system for computer science education",
SIGCSE '96: Proceedings of the twenty-seventh SIGCSE technical symposium on Computer science education, New York, NY, USA, ACM, pp. 140–144, 1996.
Yang, J., C. A. Shaffer, and L. S. Heath,
"SWAN: A Data Structure Visualization System",
GD '95: Proceedings of the Symposium on Graph Drawing, London, UK, Springer-Verlag, pp. 520–523, 1996.
Shaffer, C. A., L. S. Heath, J. M. Nielsen, and J. Yang,
"SWAN: A Student-Controllable Data Structure Visualization System",
Proceedings of ED-MEDIA 96, pp. 632–637, June, 1996.
1995
Fox, E. A., N. D. Barnette, C. A. Shaffer, L. S. Heath, W. Wake, L. T. Nowell, J. A. N. Lee, D. Hix, and H. R. Hartson,
"Progress in Interactive Learning with a Digital Library in Computer Science",
Proceedings ED-MEDIA 95, World Conf. on Educational Multimedia and Hypermedia, Graz, Austria, pp. 7-12, 07/1995.
Jun, Y., C. A. Shaffer, and L. S. Heath,
The Swan User''s Manual, Version 1.1,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1995.
1994
Bright, J. S., C. A. Shaffer, P. S. Nagarkatti, and M. Nagarkatti,
"Computer Simulation of the Immune System",
Proceedings of the Fourteenth Annual Seminar of Cancer Researchers in Virginia, pp. {17}., March, 1994.
Shaffer, C. A., J. M. A. Begole, J. L.W. Carstensen, R. W. Morrill, and E. A. Fox,
"GeoSim: A GIS-Based Simulation Laboratory for Introductory Geography",
Proceedings of the 1994 ADCIS Conference, February, 1994.
Hines, D. T., J. M. A. Begole, C. A. Klipsch, and C. A. Shaffer,
The GeoSim Interface Library (GIL): Programmer''s Manual, Version 1.0.1,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1994.
Pemmaraju, S. V., and C. A. Shaffer,
"Analysis of the worst case space complexity of a PR quadtree",
Inf. Process. Lett., vol. 49, no. 5, Amsterdam, The Netherlands, The Netherlands, Elsevier North-Holland, Inc., pp. 263–267, 1994.
1993
Shaffer, C. A., R. Juvvadi, and L. S. Heath,
"A Generalized Comparison of Quadtree and Bintree Storage Requirements",
Image and Vision Computing, vol. 11, no. 7, pp. 402–412, September, 1993.
L.W. Carstensen, J., C. A. Shaffer, R. W. Morrill, and E. A. Fox,
"GeoSim: A GIS-Based Simulation Laboratory for Introductory Geography",
Journal of Geography, vol. 92, no. 5, pp. 217–222, September/Octobe, 1993.
Shaffer, C. A.,
"Dissertation Abstracts in Computer Graphics",
SIGGRAPH Comput. Graph., vol. 27, no. 2, New York, NY, USA, ACM, pp. 86–98, 1993.
Shaffer, C. A., and P. R. Brown,
"A Paging Scheme for Pointer-Based Quadtrees",
SSD '93: Proceedings of the Third International Symposium on Advances in Spatial Databases, London, UK, Springer-Verlag, pp. 89–104, 1993.
1992
Shaffer, C. A., and G. M. Herb,
"A Real-Time Robot Arm Collision Avoidance System",
IEEE Transactions on Robotics, vol. 8, no. 2, pp. 149–160, 1992.
Shaffer, C. A.,
Data representations for Geographic Information Systems,
, vol. 27, Medford, NJ, American Society for Information Science, pp. 135–172, 1992.
Shaffer, C. A.,
"Dissertation Abstracts in Computer Graphics",
SIGGRAPH Comput. Graph., vol. 26, no. 1, pp. 76–96, January, 1992.
Shaffer, C. A., and M. T. Ursekar,
"Large Scale Editing and Vector to Raster Conversion Via Quadtree Spatial Indexing",
Proceedings of the 5th International Symposium on Spatial Data Handling, pp. 505–513, August, 1992.
Shaffer, C. A., and C. D. Feustel,
Exact computation of 2–D intersections,
, San Diego, CA, USA, Academic Press Professional, Inc., pp. 188–192, 1992.
Ryan, T. L., and C. A. Shaffer,
Device Independent Perspective Volume Rendering Using Octrees,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1992.
Pemmaraju, S. V., and C. A. Shaffer,
Analysis of the Worst Case Space Complexity of a PR Quadtree,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1992.
1991
Shaffer, C. A.,
"Real-time robot arm collision detection for telerobotics",
Comput. Electr. Eng., vol. 17, no. 3, Tarrytown, NY, USA, Pergamon Press, Inc., pp. 205–215, 1991.
,
"Getting Around on a Sphere",
Graphics Gems II, San Diego, CA, USA, Academic Press Professional, Inc., 1991.
Brown, P. R., C. A. Shaffer, and R. E. Webber,
"A paging scheme for pointer-based quadtrees",
CSC '91: Proceedings of the 19th annual conference on Computer Science, New York, NY, USA, ACM, pp. 687, 1991.
Shaffer, C. A., and Q. F. Stout,
"Linear time distance transforms for quadtrees",
CVGIP: Image Underst., vol. 54, no. 2, Orlando, FL, USA, Academic Press, Inc., pp. 215–223, 1991.
Shaffer, C. A., L. W. Carstensen, V. F. Miranda, S. A. Kriss, R. W. Morrill, and E. A. Fox,
Project GEOSIM: The First Two Modules,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1991.
Lattanzi, M. R., and C. A. Shaffer,
"An optimal boundary to quadtree conversion algorithm",
CVGIP: Image Underst., vol. 53, no. 3, Orlando, FL, USA, Academic Press, Inc., pp. 303–312, 1991.
Shaffer, C. A., and C. D. Feustel,
A Representation and Algorithm for Exact Computation of Cascaded Polygon Intersections with Fixed Storage Requirements,
, Blacksburg, VA, USA, Virginia Polytechnic Institute && State University, 1991.
1990
Shaffer, C. A.,
"A full resolution elevation representation requiring three bits per pixel",
SSD '90: Proceedings of the first symposium on Design and implementation of large spatial databases, New York, NY, USA, Springer-Verlag New York, Inc., pp. 45–64, 1990.
Ang, C. - H., H. Samet, and C. A. Shaffer,
"A New Region Expansion for Quadtrees",
IEEE Trans. Pattern Anal. Mach. Intell., vol. 12, no. 7, Washington, DC, USA, IEEE Computer Society, pp. 682–686, 1990.
Shaffer, C. A., H. Samet, and R. C. Nelson,
"QUILT: A Geographic Information System Based on Quadtrees",
International Journal of Geographic Information Systems, vol. 4, no. 2, pp. 103–131, 1990.
Oskard, D. N., T. - H. Hong, and C. A. Shaffer,
"Real-Time Algorithms and Data Structures for Underwater Mapping",
IEEE Transactions on Systems, Man, and Cybernetics, vol. 20, no. 6, pp. 1469–1475, November/Decembe, 1990.
Shaffer, C. A.,
Bit interleaving for quad or octrees,
, San Diego, CA, USA, Academic Press Professional, Inc., pp. 443–447, 1990.
Shaffer, C. A., and H. Samet,
"Set operations for unaligned linear quadtrees",
Computer Vision, Graphics & Image Processing, vol. 50, no. 1, San Diego, CA, USA, Academic Press Professional, Inc., pp. 29–49, 1990.
Shaffer, C. A.,
Fast circle-rectangle intersection checking,
, San Diego, CA, USA, Academic Press Professional, Inc., pp. 51–53, 1990.
Shaffer, C. A., and G. M. Herb,
A Real Time Robot Arm Collision Detection System,
, Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1990.
Shaffer, C. A., and G. M. Herb,
"A real-time robot collision avoidance system (abstract)",
CSC '90: Proceedings of the 1990 ACM annual conference on Cooperation, New York, NY, USA, ACM, pp. 441, 1990.
Shaffer, C. A., and D. B. Boldery,
The Elevation Pyramid,
, Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1990.
1989
Lattanzi, M., and C. A. Shaffer,
An Optimal Boundary to Quadtree Conversion Algorithm,
, Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1989.
Shaffer, C. A., and Q. F. Stout,
Linear Time Distance Transforms for Quadtrees,
, Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1989.
Shaffer, C. A., R. Juvvadi, and L. S. Heath,
A Generalized Comparison of Quadtree and Bintree Storage Requirements,
, Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1989.
1988
Ang, C. - H., H. Samet, and C. A. Shaffer,
"Fast Region Expansion for Quadtrees",
Proceedings of the Third International Symposium on Spatial Data Handling, pp. 19–38, August, 1988.
Oskard, D. N., T. - H. Hong, and C. A. Shaffer,
"Real-Time Algorithms and Data Structures for Underwater Mapping",
SPIE Symposium on Sensor Fusion: Spatial Reasoning and Scene Interpretation, November, 1988.
Shaffer, C. A., and H. Samet,
Set Operations for Unaligned Linear Quadtrees,
, Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1988.
Shaffer, C. A., and H. Samet,
"Algorithm to expand regions represented by linear quadtrees",
Image Vision Comput., vol. 6, no. 3, Newton, MA, USA, Butterworth-Heinemann, pp. 162–168, 1988.
Shaffer, C. A.,
"A formula for computing the number of quadtree node fragments created by a shift",
Pattern Recognition, vol. 7, no. 1, New York, NY, USA, Elsevier Science Inc., pp. 45–49, 1988.
1987
Samet, H., C. A. Shaffer, and R. E. Webber,
"Digitizing the plane with cells of nonuniform size",
Inf. Process. Lett., vol. 24, no. 6, Amsterdam, The Netherlands, The Netherlands, Elsevier North-Holland, Inc., pp. 369–375, 1987.
Shaffer, C. A., and H. Samet,
"Optimal quadtree construction algorithms",
Comput. Vision Graph. Image Process., vol. 37, no. 3, San Diego, CA, USA, Academic Press Professional, Inc., pp. 402–419, 1987.
1986
Shaffer, C. A.,
"An Empirical Comparison of Vectors, Rasters, and Quadtrees for Representing Geographic Data",
Proceedings of the International Colloquium on the Construction and Display of Geoscientific Maps Derived from Databases, Geologisches Jahrbuch A 104, pp. 99–115, December, 1986.
Shaffer, C. A., and H. Samet,
"An Optimal Quadtree Construction Algorithm",
Proceedings of the Eighth International Conference on Pattern Recognition, pp. 317–319, October, 1986.
Samet, H., C. A. Shaffer, R. C. Nelson, Y. - G. Huang, K. Fujimura, and A. Rosenfeld,
"Hierarchical Data Structures for Geographic Information",
Proceedings of the International Colloquium on the Construction and Display of Geoscientific Maps Derived from Databases, Geologisches Jahrbuch A 104, pp. 97–98, December, 1986.
Samet, H., C. A. Shaffer, R. C. Nelson, Y. -geng Huang, K. Fujimura, A. Rosenfeld, and D. Marble,
"Recent Developments in Quadtree-Based Geographic Information Systems",
Proceedings of the Second International Symposium on Spatial Data Handling, Seattle, Washington, pp. 15–32, 1986.
Shaffer, C. A.,
Application of alternative quadtree representations,
, College Park, MD, USA, University of Maryland at College Park, 1986.
Samet, H., C. A. Shaffer, and R. E. Webber,
"Using linear quadtrees to store vector data",
Eurographics Seminars on Data structures for raster graphics, New York, NY, USA, Springer-Verlag New York, Inc., pp. 91–123, 1986.
1985
Samet, H., C. A. Shaffer, and R. E. Webber,
"The Segment Quadtree: A Linear Quadtree-Based Representation for Linear Features",
Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'85), pp. 385–389, June, 1985.
1984
Samet, H., A. Rosenfeld, C. A. Shaffer, and R. E. Webber,
"Processing Geographic Data with Quadtrees",
Proceedings of the Seventh International Conference on Pattern Recognition, pp. 212–215, August, 1984.
Samet, H., A. Rosenfeld, C. A. Shaffer, and R. E. Webber,
"Use of Hierarchical Data Structures in Geographical Information Systems",
Proceedings of the International Symposium on Spatial Data Handling, pp. 392–411, August, 1984.
1983
Samet, H., A. Rosenfeld, C. A. Shaffer, and R. E. Webber,
"A Quadtree-Based Geographical Information System",
Proceedings of the Third Scandinavian Conference on Image Analysis, pp. 231–236, July, 1983.
Samet, H., A. Rosenfeld, C. A. Shaffer, and R. E. Webber,
"Quadtree Region Representation in Cartography: Experimental Results",
IEEE Transactions on Systems, Man, and Cybernetics, vol. 13, no. 6, pp. 1148–1154, November/Decembe, 1983.
Please see projects at: http://people.cs.vt.edu/~shaffer/
Algoviz Project Steering Committee Workshop
Granting Institution: National Science Foundation
Amount: $8,500
Building a Community and Establishing Best Practices in Algorithm Visualization Through the Algoviz Wiki
Granting Institution: National Science Foundation
Amount: $149,206
CE21 Planning Grant: Integrating Computational Thinking into Middle School Curriculum
Granting Institution: National Science Foundation
Amount: $199,998
Classroom Interventions to Reduce Procrastination
Granting Institution: National Science Foundation
Amount: $199,992
EAGER: SAVI: Dynamich Digital Text: An innovation in STEM Education
Granting Institution: University of Wisconsin Madison
Amount: $32,759
Planning Grant: Integrating Computational Thinking Into Middle School Curriculum
Granting Institution: National Science Foundation
Amount: $199,998
Refinement and Analysis of Log Surface Defect Detection Methods using High-Resolution Laser Scanner
Granting Institution: USDA Forest Service
Amount: $50,000
REU Planning Grant: Integrating Computational Thinking Into Middle School Curriculum
Granting Institution: National Science Foundation
Amount: $16,000
Steering Committee Workshop to Build a Community for Algorithm Visualization
Granting Institution:
Amount: $8,500
Stochastic Models Of Cell Cycle Regulation In Eukaryotes
Granting Institution: National Institute of General Medical Sciences
Amount: $3,424,192
TCNP Driving Biological Problem: Year 4 Renwal: Using Composition to Integerate a Cell Cycle Model with Morphological Checkpoints
Granting Institution: University of Connecticut
Amount: $20,925
TCNP Driving Biological Problems: Using Composition to Integrate a Cell Cycle Model with Morphological Checkpoints
Granting Institution: University of Connecticut
Amount: $17,738
The AlgoViz Portal: Lowering the Barriers for Entry into an Online Educational Community
Granting Institution: National Science Foundation
Amount: $149,999
The Eukaryotic Cell Cycle as a Test Case for Modeling Cellular Regulation in a Collaborative PSE
Granting Institution: DARPA
Amount: $2,442,399
Truly Interactive Textbooks for Computer Science Education
Granting Institution: National Science Foundation
Amount: $125,000
TUES: Transforming Introductory Computer Science Projects via Real-TimeWeb Data
Granting Institution: National Science Foundation
Amount: $187,983