Clifford A. Shaffer

According to our database, Clifford A. Shaffer authored at least 148 papers between 1983 and 2024.

Collaborative distances:

• Dijkstra number of three.
• Erdős number of three.

2024

The Impact of Group Discussion and Formation on Student Performance: An Experience Report in a Large CS1 Course.

Tong Wu, Xiaohang Tang, Sam Wong, Xi Chen, Clifford A. Shaffer, Yan Chen

CoRR, 2024

Ninth SPLICE Workshop on Technology and Data Infrastructure for CS Education Research.

Clifford A. Shaffer, Peter Brusilovsky, Ken Koedinger, Thomas W. Price, Tiffany Barnes, Behrooz Mostafavi

Proceedings of the 55th ACM Technical Symposium on Computer Science Education, 2024

Teaching Formal Languages through Programmed Instruction.

Mostafa Mohammed, Clifford A. Shaffer

Proceedings of the 55th ACM Technical Symposium on Computer Science Education, 2024

Mutating Matters: Analyzing the Influence of Mutation Testing in Programming Courses.

Rifat Sabbir Mansur, Clifford A. Shaffer, Stephen H. Edwards

Proceedings of the 2024 ACM Virtual Global Computing Education Conference V. 1, 2024

Towards Establishing a Training Program to Support Future CS Teaching-focused Faculty.

Mohammed F. Farghally, Mohammed Seyam, Cliff A. Shaffer

Proceedings of the 55th ACM Technical Symposium on Computer Science Education, 2024

2023

Analyzing Student Session Data in an eTextbook.

Samnyeong Heo, Mohammed F. Farghally, Mostafa Mohammed, Clifford A. Shaffer

Proceedings of the Fifth International Workshop on Intelligent Textbooks 2023 co-located with the 24th International Conference on Artificial Intelligence in Education (AIED 2023), 2023

2021

Fast and accurate incremental feedback for students' software tests using selective mutation analysis.

Ayaan M. Kazerouni, James C. Davis, Arinjoy Basak, Clifford A. Shaffer, Francisco Servant, Stephen H. Edwards

J. Syst. Softw., 2021

The Impact of Programming Project Milestones on Procrastination, Project Outcomes, and Course Outcomes: A Quasi-Experimental Study in a Third-Year Data Structures Course.

Clifford A. Shaffer, Ayaan M. Kazerouni

Proceedings of the SIGCSE '21: The 52nd ACM Technical Symposium on Computer Science Education, 2021

Teaching Formal Languages with Visualizations and Auto-Graded Exercises.

Mostafa Mohammed, Clifford A. Shaffer, Susan H. Rodger

Proceedings of the SIGCSE '21: The 52nd ACM Technical Symposium on Computer Science Education, 2021

Support for Programmed Instruction in an eTextbook.

Mostafa Mohammed, Piexuan Ge, Samnyeong Heo, Clifford A. Shaffer

Proceedings of the SIGCSE '21: The 52nd ACM Technical Symposium on Computer Science Education, 2021

The Online Transition of Two CS Courses in Response to COVID-19.

Mohammed F. Farghally, Mostafa Mohammed, Hamdy F. F. Mahmoud, Margaret Ellis, Derek Haqq, Molly Domino, Brett Jones, Clifford A. Shaffer

Proceedings of the SIGCSE '21: The 52nd ACM Technical Symposium on Computer Science Education, 2021

Clickstream Data from a Formal Languages eTextbook (Abstract).

Mostafa Mohammed, Clifford A. Shaffer

Proceedings of the Joint Proceedings of the Workshops at the International Conference on Educational Data Mining 2021 co-located with 14th International Conference on Educational Data Mining (EDM 2021), 2021

Containerizing an eTextbook Infrastructure (Abstract).

Alexander Hicks, Clifford A. Shaffer

Proceedings of the Joint Proceedings of the Workshops at the International Conference on Educational Data Mining 2021 co-located with 14th International Conference on Educational Data Mining (EDM 2021), 2021

Increasing Student Interaction with an eTextbook using Programmed Instruction (short paper).

Mostafa Mohammed, Clifford A. Shaffer

Proceedings of the Third International Workshop on Inteligent Textbooks 2021 Co-located with 22nd International Conference on Artificial Intelligence in Education (AIED 2021), 2021

2020

Design and Evaluation of a Block-based Environment with a Data Science Context.

Austin Cory Bart, Javier Tibau, Dennis G. Kafura, Clifford A. Shaffer, Eli Tilevich

IEEE Trans. Emerg. Top. Comput., 2020

Dynamic Concept Maps for eTextbook Glossaries: Design and Evaluation.

Ehsan Elgendi, Clifford A. Shaffer

Frontiers Comput. Sci., 2020

BTRecurTutor: a tutorial for practicing recursion in binary trees.

Sally Hamouda, Stephen H. Edwards, Hicham G. Elmongui, Jeremy V. Ernst, Clifford A. Shaffer

Comput. Sci. Educ., 2020

Auto-Grading Jupyter Notebooks.

Hamza Manzoor, Amit Naik, Clifford A. Shaffer, Chris North, Stephen H. Edwards

Proceedings of the 51st ACM Technical Symposium on Computer Science Education, 2020

Exploring the Bug Investigation Techniques of Intermediate Student Programmers.

Rifat Sabbir Mansur, Ayaan M. Kazerouni, Stephen H. Edwards, Clifford A. Shaffer

Proceedings of the Koli Calling '20: 20th Koli Calling International Conference on Computing Education Research, 2020

2019

Quasi-Newton Stochastic Optimization Algorithm for Parameter Estimation of a Stochastic Model of the Budding Yeast Cell Cycle.

Minghan Chen, Brandon D. Amos, Layne T. Watson, John J. Tyson, Young Cao, Clifford A. Shaffer, Michael W. Trosset, Cihan Oguz, Gisella Kakoti

IEEE ACM Trans. Comput. Biol. Bioinform., 2019

RecurTutor: An Interactive Tutorial for Learning Recursion.

Sally Hamouda, Stephen H. Edwards, Hicham G. Elmongui, Jeremy V. Ernst, Clifford A. Shaffer

ACM Trans. Comput. Educ., 2019

Crossing the Borders: Re-Use of Smart Learning Objects in Advanced Content Access Systems.

Hamza Manzoor, Kamil Akhuseyinoglu, Jackson Wonderly, Peter Brusilovsky, Clifford A. Shaffer

Future Internet, 2019

Using Interactive Visualization and Programmed Instruction to Teach Formal Languages.

Mostafa Mohammed, Clifford A. Shaffer, Susan H. Rodger

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

Assessing Incremental Testing Practices and Their Impact on Project Outcomes.

Ayaan M. Kazerouni, Clifford A. Shaffer, Stephen H. Edwards, Francisco Servant

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

Student Debugging Practices and Their Relationships with Project Outcomes.

Ayaan M. Kazerouni, Riffat Sabbir Mansur, Stephen H. Edwards, Clifford A. Shaffer

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

Approaches for Coordinating eTextbooks, Online Programming Practice, Automated Grading, and More into One Course.

Margaret Ellis, Clifford A. Shaffer, Stephen H. Edwards

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

What Have We Talked About?

Austin Cory Bart, Clifford A. Shaffer

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

Using Programmed Instruction to Help Students Engage with eTextbook Content.

Mostafa Mohammed, Susan H. Rodger, Clifford A. Shaffer

Proceedings of the First Workshop on Intelligent Textbooks co-located with 20th International Conference on Artificial Intelligence in Education (AIED 2019), 2019

2018

JigCell Model Connector: building large molecular network models from components.

Thomas C. Jones Jr, Stefan Hoops, Layne T. Watson, Alida Palmisano, John J. Tyson, Clifford A. Shaffer

Simul., 2018

Experience: Learner Analytics Data Quality for an eTextbook System.

Kyu Han Koh, Eric Fouh, Mohammed F. Farghally, Hossameldin Shahin, Clifford A. Shaffer

ACM J. Data Inf. Qual., 2018

CS Education Infrastructure for All: Interoperability for Tools and Data Analytics (Abstract Only).

Clifford A. Shaffer, Peter Brusilovsky, Kenneth R. Koedinger, Stephen H. Edwards

Proceedings of the 49th ACM Technical Symposium on Computer Science Education, 2018

An Interactive Tutorial for Learning to Manipulate References: (Abstract Only).

Mostafa Mohammed, Sushma Mandava, Jieun Chon, Margaret Ellis, Clifford A. Shaffer

Proceedings of the 49th ACM Technical Symposium on Computer Science Education, 2018

Reconciling the Promise and Pragmatics of Enhancing Computing Pedagogy with Data Science.

Austin Cory Bart, Dennis G. Kafura, Clifford A. Shaffer, Eli Tilevich

Proceedings of the 49th ACM Technical Symposium on Computer Science Education, 2018

2017

Computing with CORGIS: Diverse, Real-world Datasets for Introductory Computing.

Austin Cory Bart, Ryan Whitcomb, Dennis G. Kafura, Clifford A. Shaffer, Eli Tilevich

Inroads, 2017

A basic recursion concept inventory.

Sally Hamouda, Stephen H. Edwards, Hicham G. Elmongui, Jeremy V. Ernst, Clifford A. Shaffer

Comput. Sci. Educ., 2017

BlockPy: An Open Access Data-Science Environment for Introductory Programmers.

Austin Cory Bart, Javier Tibau, Eli Tilevich, Clifford A. Shaffer, Dennis G. Kafura

Computer, 2017

Evaluating the Effectiveness of Algorithm Analysis Visualizations.

Mohammed F. Farghally, Kyu Han Koh, Hossameldin Shahin, Clifford A. Shaffer

Proceedings of the 2017 ACM SIGCSE Technical Symposium on Computer Science Education, 2017

Towards a Concept Inventory for Algorithm Analysis Topics.

Mohammed F. Farghally, Kyu Han Koh, Jeremy V. Ernst, Clifford A. Shaffer

Proceedings of the 2017 ACM SIGCSE Technical Symposium on Computer Science Education, 2017

DevEventTracker: Tracking Development Events to Assess Incremental Development and Procrastination.

Ayaan M. Kazerouni, Stephen H. Edwards, T. Simin Hall, Clifford A. Shaffer

Proceedings of the 2017 ACM Conference on Innovation and Technology in Computer Science Education, 2017

Quantifying Incremental Development Practices and Their Relationship to Procrastination.

Ayaan M. Kazerouni, Stephen H. Edwards, Clifford A. Shaffer

Proceedings of the 2017 ACM Conference on International Computing Education Research, 2017

2016

Creating Engaging Online Learning Material with the JSAV JavaScript Algorithm Visualization Library.

Ville Karavirta, Clifford A. Shaffer

IEEE Trans. Learn. Technol., 2016

Crib sheets and exam performance in a data structures course.

Sally Hamouda, Clifford A. Shaffer

Comput. Sci. Educ., 2016

Using OpenDSA eTextbooks in Your Class (Abstract Only).

Clifford A. Shaffer, Thomas L. Naps, Susan H. Rodger

Proceedings of the 47th ACM Technical Symposium on Computing Science Education, 2016

OpenDSA: An Interactive eTextbook for Computer Science Courses.

Clifford A. Shaffer

Proceedings of the 47th ACM Technical Symposium on Computing Science Education, 2016

Visualizing Algorithm Analysis Topics (Abstract Only).

Mohammed F. Farghally, Eric Fouh, Sally Hamouda, Kyu Han Koh, Clifford A. Shaffer

Proceedings of the 47th ACM Technical Symposium on Computing Science Education, 2016

Instructional Design is to Teaching as Software Engineering is to Programming.

Austin Cory Bart, Clifford A. Shaffer

Proceedings of the 47th ACM Technical Symposium on Computing Science Education, 2016

Investigating Difficult Topics in a Data Structures Course Using Item Response Theory and Logged Data Analysis.

Eric Fouh, Mohammed F. Farghally, Sally Hamouda, Kyu Han Koh, Clifford A. Shaffer

Proceedings of the 9th International Conference on Educational Data Mining, 2016

Implementing an Open-Access, Data Science Programming Environment for Learners.

Austin Cory Bart, Javier Tibau, Eli Tilevich, Clifford A. Shaffer, Dennis G. Kafura

Proceedings of the 40th IEEE Annual Computer Software and Applications Conference, 2016

2015

A Framework to Analyze the Performance of Load Balancing Schemes for Ensembles of Stochastic Simulations.

Tae-Hyuk Ahn, Adrian Sandu, Layne T. Watson, Clifford A. Shaffer, Yang Cao, William T. Baumann

Int. J. Parallel Program., 2015

JigCell Run Manager (JC-RM): a tool for managing large sets of biochemical model parametrizations.

Alida Palmisano, Stefan Hoops, Layne T. Watson, Thomas C. Jones Jr, John J. Tyson, Clifford A. Shaffer

BMC Syst. Biol., 2015

Creating Stimulating, Relevant, and Manageable Introductory Computer Science Projects that Utilize Real-Time, Large, Web-Based Datasets (Abstract Only).

Eli Tilevich, Clifford A. Shaffer, Austin Cory Bart

Proceedings of the 46th ACM Technical Symposium on Computer Science Education, 2015

Best Practices for IRB Approval: Four Perspectives.

Michael S. Kirkpatrick, Janice E. Cuny, Mark Guzdial, Amanda M. Holland-Minkley, Clifford A. Shaffer

Proceedings of the 46th ACM Technical Symposium on Computer Science Education, 2015

Big Data in Computer Science Education Research.

Orit Hazzan, Clifford A. Shaffer

Proceedings of the 46th ACM Technical Symposium on Computer Science Education, 2015

Open Educational Resources: What Next? (Abstract Only).

Lillian (Boots) Cassel, Cynthia Bailey Lee, Clifford A. Shaffer, Darina Dicheva

Proceedings of the 46th ACM Technical Symposium on Computer Science Education, 2015

Examining Classroom Interventions to Reduce Procrastination.

Stephen H. Edwards, Joshua Martin, Clifford A. Shaffer

Proceedings of the 2015 ACM Conference on Innovation and Technology in Computer Science Education, 2015

The Effects of Procrastination Interventions on Programming Project Success.

Joshua Martin, Stephen H. Edwards, Clifford A. Shaffer

Proceedings of the eleventh annual International Conference on International Computing Education Research, 2015

2014

Design and architecture of an interactive eTextbook - The OpenDSA system.

Eric Fouh, Ville Karavirta, Daniel A. Breakiron, Sally Hamouda, T. Simin Hall, Thomas L. Naps, Clifford A. Shaffer

Sci. Comput. Program., 2014

Open source software and the algorithm visualization community.

Matthew L. Cooper, Clifford A. Shaffer, Stephen H. Edwards, Sean P. Ponce

Sci. Comput. Program., 2014

Grand Challenges in Digital Education.

Clifford A. Shaffer

Frontiers ICT, 2014

Exploring students learning behavior with an interactive etextbook in computer science courses.

Eric Fouh, Daniel A. Breakiron, Sally Hamouda, Mohammed F. Farghally, Clifford A. Shaffer

Comput. Hum. Behav., 2014

Multistate Model Builder (MSMB): a flexible editor for compact biochemical models.

Alida Palmisano, Stefan Hoops, Layne T. Watson, Thomas C. Jones Jr, John J. Tyson, Clifford A. Shaffer

BMC Syst. Biol., 2014

Creating stimulating, relevant, and manageable introductory computer science projects that utilize real-time web-based data (abstract only).

Eli Tilevich, Clifford A. Shaffer, Austin Cory Bart

Proceedings of the 45th ACM Technical Symposium on Computer Science Education, 2014

Analysis of interaction logs for online tutorials (abstract only).

Daniel A. Breakiron, Eric Fouh, Sally Hamouda, Clifford A. Shaffer

Proceedings of the 45th ACM Technical Symposium on Computer Science Education, 2014

Transforming introductory computer science projects via real-time web data.

Austin Cory Bart, Eli Tilevich, T. Simin Hall, Tony Allevato, Clifford A. Shaffer

Proceedings of the 45th ACM Technical Symposium on Computer Science Education, 2014

Recommendation based on Deduced Social Networks in an educational digital library.

Monika Akbar, Clifford A. Shaffer, Weiguo Fan, Edward A. Fox

Proceedings of the IEEE/ACM Joint Conference on Digital Libraries, 2014

2013

Using hierarchical data mining to characterize performance of wireless system configurations.

Alex Verstak, Naren Ramakrishnan, Layne T. Watson, Jian He, Clifford A. Shaffer, Ananth Grama

Adv. Eng. Softw., 2013

Automated generation and grading of programming assignments (abstract only).

Steven C. Shaffer, Clifford A. Shaffer

Proceedings of the 44th ACM Technical Symposium on Computer Science Education, 2013

Panel: textbook pricing, present and future.

Edward F. Gehringer, Beth Lang Golub, Randi Cohen, David M. Arnow, Clifford A. Shaffer

Proceedings of the 44th ACM Technical Symposium on Computer Science Education, 2013

OpenDSA: using an active eTextbook to teach data structures and algorithms (abstract only).

Eric Fouh, Daniel A. Breakiron, Mai Elshehaly, T. Simin Hall, Ville Karavirta, Clifford A. Shaffer

Proceedings of the 44th ACM Technical Symposium on Computer Science Education, 2013

Requirements and design strategies for open source interactive computer science eBooks.

Ari Korhonen, Thomas L. Naps, Charles Boisvert, Pilu Crescenzi, Ville Karavirta, Linda Mannila, Bradley Miller, Briana B. Morrison, Susan H. Rodger, Rocky Ross, Clifford A. Shaffer

Proceedings of the ITiCSE working group reports conference on Innovation and technology in computer science education-working group reports, 2013

JSAV: the JavaScript algorithm visualization library.

Ville Karavirta, Clifford A. Shaffer

Proceedings of the Innovation and Technology in Computer Science Education conference 2013, 2013

2012

Active eTextbooks for CS: what should they be? (abstract only).

Clifford A. Shaffer

Proceedings of the 43rd ACM technical symposium on Computer science education, 2012

OpenDSA: a creative commons active-ebook (abstract only).

Eric Fouh, Maoyuan Sun, Clifford A. Shaffer

Proceedings of the 43rd ACM technical symposium on Computer science education, 2012

User type clustering to refine search and browse for educational resources (abstract only).

Monika Akbar, Clifford A. Shaffer

Proceedings of the 43rd ACM technical symposium on Computer science education, 2012

Deduced social networks for an educational digital library.

Monika Akbar, Clifford A. Shaffer, Edward A. Fox

Proceedings of the 12th ACM/IEEE-CS Joint Conference on Digital Libraries, 2012

2011

Getting algorithm visualizations into the classroom.

Clifford A. Shaffer, Monika Akbar, Alexander Joel D. Alon, Michael Stewart, Stephen H. Edwards

Proceedings of the 42nd ACM technical symposium on Computer science education, 2011

OpenDSA: beginning a community active-eBook project.

Clifford A. Shaffer, Ville Karavirta, Ari Korhonen, Thomas L. Naps

Proceedings of the 11th Koli Calling International Conference on Computing Education Research, 2011

Scheduling and student performance.

Clifford A. Shaffer, Stephen H. Edwards

Proceedings of the 16th Annual SIGCSE Conference on Innovation and Technology in Computer Science Education, 2011

How educators find educational resources online.

Monika Akbar, Weiguo Fan, Lillian N. Cassel, Lois M. L. Delcambre, Clifford A. Shaffer, Edward A. Fox, Yinlin Chen

Proceedings of the 16th Annual SIGCSE Conference on Innovation and Technology in Computer Science Education, 2011

Digital Library 2.0 for Educational Resources.

Monika Akbar, Weiguo Fan, Clifford A. Shaffer, Yinlin Chen, Lillian N. Cassel, Lois M. L. Delcambre, Daniel D. Garcia, Gregory W. Hislop, Frank M. Shipman III, Richard Furuta, B. Stephen Carpenter II, Hao-wei Hsieh, Bob Siegfried, Edward A. Fox

Proceedings of the Research and Advanced Technology for Digital Libraries, 2011

2010

Model Composition for Macromolecular Regulatory Networks.

Ranjit Randhawa, Clifford A. Shaffer, John J. Tyson

IEEE ACM Trans. Comput. Biol. Bioinform., 2010

Algorithm Visualization: The State of the Field.

Clifford A. Shaffer, Matthew L. Cooper, Alexander Joel D. Alon, Monika Akbar, Michael Stewart, Sean P. Ponce, Stephen H. Edwards

ACM Trans. Comput. Educ., 2010

Multistate modeling and simulation for regulatory networks.

Zhen Liu, Umme Juka Mobassera, Clifford A. Shaffer, Layne T. Watson, Yang Cao

Proceedings of the 2010 Winter Simulation Conference, 2010

Building an online educational community for algorithm visualization.

Clifford A. Shaffer, Thomas L. Naps, Susan H. Rodger, Stephen H. Edwards

Proceedings of the 41st ACM technical symposium on Computer science education, 2010

Ensemble PDP-8: eight principles for distributed portals.

Edward A. Fox, Yinlin Chen, Monika Akbar, Clifford A. Shaffer, Stephen H. Edwards, Peter Brusilovsky, Daniel D. Garcia, Lois M. L. Delcambre, Felicia Decker, David W. Archer, Richard Furuta, Frank M. Shipman III, Stephen Carpenter, Lillian N. Cassel

Proceedings of the 2010 Joint International Conference on Digital Libraries, 2010

2009

Model aggregation: a building-block approach to creating large macromolecular regulatory networks.

Ranjit Randhawa, Clifford A. Shaffer, John J. Tyson

Bioinform., 2009

Stochastic cell cycle modeling for budding yeast.

Tae-Hyuk Ahn, Pengyuan Wang, Layne T. Watson, Yang Cao, Clifford A. Shaffer, William T. Baumann

Proceedings of the 2009 Spring Simulation Multiconference, SpringSim 2009, 2009

2008

Deterministic parallel global parameter estimation for a model of the budding yeast cell cycle.

Thomas D. Panning, Layne T. Watson, Nicholas A. Allen, Katherine C. Chen, Clifford A. Shaffer, John J. Tyson

J. Glob. Optim., 2008

Converting macromolecular regulatory models from deterministic to stochastic formulation.

Pengyuan Wang, Ranjit Randhawa, Clifford A. Shaffer, Yang Cao, William T. Baumann

Proceedings of the 2008 Spring Simulation Multiconference, 2008

2007

S⁴W: a problem-solving environment for wireless system design.

Dhananjay Mishra, Clifford A. Shaffer, Naren Ramakrishnan, Layne T. Watson, Kyung Kyoon Bae, Jian He, Alex Verstak, William H. Tranter

Softw. Pract. Exp., 2007

A Mathematical Programming Formulation for the Budding Yeast Cell Cycle.

Thomas D. Panning, Layne T. Watson, Clifford A. Shaffer, John J. Tyson

Simul., 2007

Fusing and composing macromolecular regulatory network models.

Ranjit Randhawa, Clifford A. Shaffer, John J. Tyson

Proceedings of the 2007 Spring Simulation Multiconference, 2007

Algorithm visualization: a report on the state of the field.

Clifford A. Shaffer, Matthew Cooper, Stephen H. Edwards

Proceedings of the 38th SIGCSE Technical Symposium on Computer Science Education, 2007

2006

The JigCell Model Builder: A Spreadsheet Interface for Creating Biochemical Reaction Network Models.

Marc Vass, Clifford A. Shaffer, Naren Ramakrishnan, Layne T. Watson, John J. Tyson

IEEE ACM Trans. Comput. Biol. Bioinform., 2006

Experiences teaching a graduate research methods course.

Clifford A. Shaffer

ACM SIGCSE Bull., 2006

The role of composition and aggregation in modeling macromolecular regulatory networks.

Clifford A. Shaffer, Ranjit Randhawa, John J. Tyson

Proceedings of the Winter Simulation Conference WSC 2006, 2006

Challenges for modeling and simulation methods in systems biology.

Herbert M. Sauro, David Harel, Marta Z. Kwiatkowska, Clifford A. Shaffer, Adelinde M. Uhrmacher, Michael Hucka, Pedro Mendes, Lena Strömbäck, John J. Tyson

Proceedings of the Winter Simulation Conference WSC 2006, 2006

2005

Building modeling tools that support verification, validation, and testing for the domain expert.

Nicholas A. Allen, Clifford A. Shaffer, Layne T. Watson

Proceedings of the 37th Winter Simulation Conference, Orlando, FL, USA, December 4-7, 2005, 2005

2004

Globally optimal transmitter placement for indoor wireless communication systems.

Jian He, Alex Verstak, Layne T. Watson, C. A. Stinson, Naren Ramakrishnan, Clifford A. Shaffer, Theodore S. Rappaport, Christopher Robert Anderson, Kyung Kyoon Bae, Jing Jiang, William H. Tranter

IEEE Trans. Wirel. Commun., 2004

Towards integrated PSEs for wireless communications: experiences with the S⁴W and SitePlanner® projects.

Roger R. Skidmore, Alex Verstak, Naren Ramakrishnan, Theodore S. Rappaport, Layne T. Watson, Jian He, Srinidhi Varadarajan, Clifford A. Shaffer, Jeremy K.-P. Chen, Kyung Kyoon Bae, Jing Jiang, William H. Tranter

ACM SIGMOBILE Mob. Comput. Commun. Rev., 2004

The JigCell Model Builder and Run Manager.

Marc Vass, Nicholas A. Allen, Clifford A. Shaffer, Naren Ramakrishnan, Layne T. Watson, John J. Tyson

Bioinform., 2004

Buffer pools and file processing projects for an undergraduate data structures course.

Clifford A. Shaffer

Proceedings of the 35th SIGCSE Technical Symposium on Computer Science Education, 2004

Effective features of algorithm visualizations.

Purvi Saraiya, Clifford A. Shaffer, D. Scott McCrickard, Chris North

Proceedings of the 35th SIGCSE Technical Symposium on Computer Science Education, 2004

A Hierarchical Parallel Scheme for Global Parameter Estimation in Systems Biology.

Jian He, Masha Sosonkina, Clifford A. Shaffer, John J. Tyson, Layne T. Watson, Jason W. Zwolak

Proceedings of the 18th International Parallel and Distributed Processing Symposium (IPDPS 2004), 2004

Defect detection on hardwood logs using high resolution three dimensional laser scan data.

Liya Thomas, Lamine Mili, Clifford A. Shaffer, Ed Thomas

Proceedings of the 2004 International Conference on Image Processing, 2004

2003

BSML: A binding schema markup language for data interchange in problem solving environments.

Alex Verstak, Naren Ramakrishnan, Layne T. Watson, Jian He, Clifford A. Shaffer, Kyung Kyoon Bae, Jing Jiang, William H. Tranter, Theodore S. Rappaport

Sci. Program., 2003

Improving the Development Process for Eukaryotic Cell Cycle Models with a Modeling Support Environment.

Nicholas A. Allen, Clifford A. Shaffer, Naren Ramakrishnan, Marc T. Vass, Layne T. Watson

Simul., 2003

From landscapes to waterscapes: A PSE for landuse change analysis.

E. J. Rubin, Clifford A. Shaffer, Naren Ramakrishnan, Layne T. Watson, Randel L. Dymond, David F. Kibler, R. Dietz, Jeffrey G. Chanat, Vinod Lohani, Darrell Bosch, Cameron Speir

Eng. Comput., 2003

Next generation modeling II - applications: improving the development process for eukaryotic cell cycle models with a modeling support environment.

Nicholas A. Allen, Clifford A. Shaffer, Marc Vass, Naren Ramakrishnan, Layne T. Watson

Proceedings of the 35th Winter Simulation Conference: Driving Innovation, 2003

2002

Using Hierarchical Data Mining to Characterize Performance of Wireless System Configurations

Alex Verstak, Naren Ramakrishnan, Kyung Kyoon Bae, William H. Tranter, Layne T. Watson, Jian He, Clifford A. Shaffer, Theodore S. Rappaport

CoRR, 2002

BSML: A Binding Schema Markup Language for Data Interchange in Problem Solving Environments (PSEs)

Alex Verstak, Naren Ramakrishnan, Layne T. Watson, Jian He, Clifford A. Shaffer, Kyung Kyoon Bae, Jing Jiang, William H. Tranter, Theodore S. Rappaport

CoRR, 2002

Programming environments for multidisciplinary Grid communities.

Naren Ramakrishnan, Layne T. Watson, Dennis G. Kafura, Calvin J. Ribbens, Clifford A. Shaffer

Concurr. Comput. Pract. Exp., 2002

Dynamic Data Structures for a Direct Search Algorithm.

Jian He, Layne T. Watson, Naren Ramakrishnan, Clifford A. Shaffer, Alex Verstak, Jing Jiang, Kyung Kyoon Bae, William H. Tranter

Comput. Optim. Appl., 2002

S4W: Globally Optimized Design of Wireless Communications Systems.

Alex Verstak, Jian He, Layne T. Watson, Naren Ramakrishnan, Clifford A. Shaffer, Theodore S. Rappaport, Christopher Robert Anderson, Kyung Kyoon Bae, Jing Jiang, William H. Tranter

Proceedings of the 16th International Parallel and Distributed Processing Symposium (IPDPS 2002), 2002

Supporting creativity in problem solving environments.

Marc Vass, John M. Carroll, Clifford A. Shaffer

Proceedings of the 4th Conference on Creativity & Cognition, 2002

2001

Resource sharing for replicated synchronous groupware.

James Begole, Randall B. Smith, Craig A. Struble, Clifford A. Shaffer

IEEE/ACM Trans. Netw., 2001

VizCraft: a problem-solving environment for aircraft configuration design.

Amit Goel, Chuck A. Baker, Clifford A. Shaffer, Bernard Grossman, William H. Mason, Layne T. Watson, Raphael T. Haftka

Comput. Sci. Eng., 2001

1999

Flexible collaboration transparency: supporting worker independence in replicated application-sharing systems.

James Begole, Mary Beth Rosson, Clifford A. Shaffer

ACM Trans. Comput. Hum. Interact., 1999

WBCSim: A Prototype Problem Solving Environment for Wood-Based Composites Simulations.

Amit Goel, Constantinos Phanouriou, Frederick A. Kamke, Calvin J. Ribbens, Clifford A. Shaffer, Layne T. Watson

Eng. Comput., 1999

An Analysis of a Course-Oriented Electronic Mailing List.

Stephen H. Edwards, Clifford A. Shaffer

Comput. Sci. Educ., 1999

VizCraft: A Multidimensional Visualization Tool for Aircraft Configuration Design.

Amit Goel, Chuck Baker, Clifford A. Shaffer, Bernard Grossman, Raphael T. Haftka, William H. Mason, Layne T. Watson

Proceedings of the 10th IEEE Visualization Conference, 1999

1998

Visualization for multiparameter aircraft designs.

Clifford A. Shaffer, Duane L. Knill, Layne T. Watson

Proceedings of the 9th IEEE Visualization Conference, 1998

Supporting Worker Independence in Collaboration Transparency.

James Begole, Mary Beth Rosson, Clifford A. Shaffer

Proceedings of the 11th Annual ACM Symposium on User Interface Software and Technology, 1998

1997

Leveraging Java Applets: Toward Collaboration Transparency in Java.

James Begole, Craig A. Struble, Clifford A. Shaffer

IEEE Internet Comput., 1997

Transparent Sharing of Java Applets: A Replicated Approach.

James Begole, Craig A. Struble, Clifford A. Shaffer, Randall B. Smith

Proceedings of the 10th Annual ACM Symposium on User Interface Software and Technology, 1997

1996

Using the Swan data structure visualization system for computer science education.

Clifford A. Shaffer, Lenwood S. Heath, Jun Yang

Proceedings of the 27th SIGCSE Technical Symposium on Computer Science Education, 1996

1995

SWAN: A Data Structure Visualization System.

Jun Yang, Clifford A. Shaffer, Lenwood S. Heath

Proceedings of the Graph Drawing, Symposium on Graph Drawing, 1995

1994

Analysis of the Worst Case Space Complexity of a PR Quadtree.

Sriram V. Pemmaraju, Clifford A. Shaffer

Inf. Process. Lett., 1994

1993

Generalized comparison of quadtree and bintree storage requirements.

Clifford A. Shaffer, Ramana Juvvadi, Lenwood S. Heath

Image Vis. Comput., 1993

A Paging Scheme for Pointer-Based Quadtrees.

Clifford A. Shaffer, Patrick R. Brown

Proceedings of the Advances in Spatial Databases, 1993

1992

A real-time robot arm collision avoidance system.

Clifford A. Shaffer, Gregory M. Herb

IEEE Trans. Robotics Autom., 1992

Exact Computation of 2-d intersections.

Clifford A. Shaffer, Charles Feustel

Proceedings of the Graphics Gems III (IBM Version), 1992

1991

Linear time distance transforms for quadtrees.

Clifford A. Shaffer, Quentin F. Stout

CVGIP Image Underst., 1991

An optimal boundary to quadtree conversion algorithm.

Mark R. Lattanzi, Clifford A. Shaffer

CVGIP Image Underst., 1991

A paging scheme for pointer-based quadtrees (abstract only).

Patrick R. Brown, Clifford A. Shaffer, Robert E. Webber

Proceedings of the 19th annual conference on Computer Science, 1991

1990

Real-time algorithms and data structures for underwater mapping.

David N. Oskard, Tsai-Hong Hong, Clifford A. Shaffer

IEEE Trans. Syst. Man Cybern., 1990

A New Region Expansion for Quadtrees.

Chuan-Heng Ang, Hanan Samet, Clifford A. Shaffer

IEEE Trans. Pattern Anal. Mach. Intell., 1990

QUILT: a geographic information system based on quadtrees.

Clifford A. Shaffer, Hanan Samet, Randal C. Nelson

Int. J. Geogr. Inf. Sci., 1990

Set Operations for Unaligned Linear Quadtrees.

Clifford A. Shaffer, Hanan Samet

Comput. Vis. Graph. Image Process., 1990

A Real-Time Robot Collision Avoidance System (Abstract).

Clifford A. Shaffer, Gregory M. Herb

Proceedings of the ACM 18th Annual Computer Science Conference on Cooperation, 1990

1989

A Full Resolution Elevation Representation Requiring Three Bits per Pixel.

Clifford A. Shaffer

Proceedings of the Design and Implementation of Large Spatial Databases, 1989

1988

A formula for computing the number of quadtree node fragments created by a shift.

Clifford A. Shaffer

Pattern Recognit. Lett., 1988

Algorithm to expand regions represented by linear quadtrees.

Clifford A. Shaffer, Hanan Samet

Image Vis. Comput., 1988

1987

Digitizing the Plane with Cells of Nonuniform Size.

Hanan Samet, Clifford A. Shaffer, Robert E. Webber

Inf. Process. Lett., 1987

Optimal quadtree construction algorithms.

Clifford A. Shaffer, Hanan Samet

Comput. Vis. Graph. Image Process., 1987

1985

A Model for the Analysis of Neighbor Finding in Pointer-Based Quadtrees.

Hanan Samet, Clifford A. Shaffer

IEEE Trans. Pattern Anal. Mach. Intell., 1985

1984

A geographic information system using quadtrees.

Hanan Samet, Azriel Rosenfeld, Clifford A. Shaffer, Robert E. Webber

Pattern Recognit., 1984

1983

Quadtree region representation in cartography: Experimental results.

Hanan Samet, Azriel Rosenfeld, Clifford A. Shaffer, Robert E. Webber

IEEE Trans. Syst. Man Cybern., 1983