William E. Hart

发表

Scalable Water Network Sensor Placement via Aggregation

Robert D. Carr, Cynthia A. Phillips, Jonathan W. Berry, 2007 .

Validation and Assessment of Integer Programming Sensor Placement Models

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2005 .

A FACILITY LOCATION APPROACH TO SENSOR PLACEMENT OPTIMIZATION

Jonathan W. Berry, William E. Hart, Jean-Paul Watson, 2008 .

The Acro/COLIN Framework: Developing Flexible Optimization Interfaces for Parallel Hybrid and Dynamically-Configured Algorithms.

John Daniel Siirola, William E. Hart, 2008 .

Addressing Modeling Uncertainties in Sensor Placement for Community Water Systems

Harvey J. Greenberg, Robert D. Carr, Cynthia A. Phillips, 2004 .

Dynamic Response of Automatic Water‐Level Controller. I: Theory

William E. Hart, Albert J. Clemmens, Changde Wang, 1990 .

Python Optimization Modeling Objects (Pyomo)

William E. Hart, W. Hart, 2009 .

The Pyomo Command

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

US Environmental Protection Agency Uses Operations Research to Reduce Contamination Risks in Drinking Water

Robert D. Carr, Cynthia A. Phillips, Jonathan W. Berry, 2009, Interfaces.

Invariant Patterns in Crystal Lattices: Implications for Protein Folding Algorithms (Extended Abstract)

William E. Hart, Sorin Istrail, 1996, CPM.

A Comparison of Global and Local Search Methods in Drug Docking

William E. Hart, Richard K. Belew, Christopher D. Rosin, 1997, ICGA.

Water security toolkit

Sean Andrew McKenna, David Hart, Katherine A. Klise, 2012 .

Integrating Event Detection System Operating Characteristics into Sensor Placement Optimization

Sean Andrew McKenna, Cynthia Ann Phillips, William E. Hart, 2011 .

Automated measurement of retinal vascular tortuosity

Michael H. Goldbaum, William E. Hart, Paul Kube, 1997, AMIA.

Scripting and Algorithm Development

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

C++ Utility Library V4.0

John Daniel Siirola, William E. Hart, Lee Ann Riesen, 2010 .

A Multiple-Objective Analysis of Sensor Placement Optimization in Water Networks

Harvey J. Greenberg, William E. Hart, Jean-Paul Watson, 2004 .

Editorial Introduction Special Issue on Memetic Algorithms

William E. Hart, Jim E. Smith, N. Ktaliorasnogor, 2004, Evolutionary Computation.

Morphing of Water Networks.

Carl D. Laird, Jonathan W. Berry, William E. Hart, 2007 .

Pyomo Models and Components: An Introduction

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

FORMULATING AND ANALYZING MULTI-STAGE SENSOR PLACEMENT PROBLEMS

David L. Woodruff, William E. Hart, Jean-Paul Watson, 2011 .

EXACT: the experimental algorithmics computational toolkit

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2007, ExpCS '07.

Optimization with genetic algorithm hybrids that use local searches

William E. Hart, Richard K. Belew, W. Hart, 1996 .

Alignment Of Protein Structures With A Memetic Evolutionary Algorithm

Robert D. Carr, Edmund K. Burke, William E. Hart, 2002, GECCO.

TEVA-SPOT Toolkit 1.2

Jonathan W. Berry, William E. Hart, Lee Ann Riesen, 2007 .

Automated registration of digital ocular fundus images for comparison of lesions

Mark Nelson, Michael H. Goldbaum, William E. Hart, 1993, Photonics West - Lasers and Applications in Science and Engineering.

Pyomo: modeling and solving mathematical programs in Python

David L. Woodruff, William E. Hart, Jean-Paul Watson, 2011, Math. Program. Comput..

Fast protein folding in the hydrophobic-hydrophilic model within three-eights of optimal

William E. Hart, Sorin Istrail, W. Hart, 1995, STOC '95.

Parallel Integer and Combinatorial Optimization Library (PICO)

Cynthia A. Phillips, William E. Hart, Jonathan Eckstein, 2001 .

Real-World Case Studies for Sensor Network Design of Drinking Water Contamination Warning Systems

Cynthia A. Phillips, William E. Hart, Regan Murray, 2011 .

Sensor Network Design for Contamination Warning Systems: Tools and Applications

Jonathan W. Berry, William E. Hart, Regan Murray, 2006 .

Optimization under uncertainty research and applications at Sandia National Laboratories.

Cynthia A. Phillips, Michael S. Eldred, William E. Hart, 2005 .

The Role of Development in Genetic Algorithms

William E. Hart, Richard K. Belew, Thomas E. Kammeyer, 1994, FOGA.

Robust Proofs of NP-Hardness for Protein Folding: General Lattices and Energy Potentials

William E. Hart, Sorin Istrail, W. Hart, 1997, J. Comput. Biol..

The Pyomo Command-line Interface

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

A Generalized Stationary Point Convergence Theory for Evolutionary Algorithms

William E. Hart, W. Hart, 1997, ICGA.

Evaluating Multiobjective Sensor Placements.

John Daniel Siirola, Carl D. Laird, Cynthia Ann Phillips, 2011 .

Registering retinal images using automatically selected control point pairs

Michael H. Goldbaum, William E. Hart, William E. Hart, 1994, Proceedings of 1st International Conference on Image Processing.

Rethinking the design of real-coded evolutionary algorithms: Making discrete choices in continuous search domains

William E. Hart, W. Hart, 2005, Soft Comput..

Sensor Placement in Municipal Water Networks

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2003 .

A Filter-Based Evolutionary Algorithm for Constrained Optimization

William E. Hart, Lauren M. Clevenger, Lauren Ferguson, 2004, Evolutionary Computation.

A review of sensor placement strategies for contamination warning systems.

William E. Hart, Regan Murray, 2008 .

Opportunities for Combinatorial Optimization in Computational Biology

Harvey J. Greenberg, William E. Hart, Giuseppe Lancia, 2004, INFORMS J. Comput..

Model Components: Variables, Objectives, and Constraints

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

Optimizing an Arbitrary Function is Hard for the Genetic Algorithm

William E. Hart, Richard K. Belew, W. Hart, 1991 .

Scalable High-Performance Heuristics for Sensor Placement in Water Distribution Networks

Jonathan W. Berry, William E. Hart, Jean-Paul Watson, 2005 .

On the Intractability of Protein Folding with a Finite Alphabet of Amino Acids

William E. Hart, John Atkins, 1999, Algorithmica.

Fast Protein Folding in the Hydrophobic-Hydrophillic Model within Three-Eights of Optimal

William E. Hart, Sorin Istrail, 1996, J. Comput. Biol..

Sensor Placement in Municipal Water Networks with Temporal Integer Programming Models

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2006 .

Detection and reconstruction of error control codes for engineered and biological regulatory systems.

William E. Hart, Jean-Paul Watson, Richard J. Pryor, 2003 .

Recent Advances in Memetic Algorithms

William E. Hart, Natalio Krasnogor, Jim Smith, 2008 .

Optimization of Large-Scale Heterogeneous System-of-Systems Models

David L. Woodruff, Ojas Parekh, John Daniel Siirola, 2012 .

PEBBL: an object-oriented framework for scalable parallel branch and bound

Cynthia A. Phillips, William E. Hart, Jonathan Eckstein, 2015, Math. Program. Comput..

Initializing Abstract Models with Data Command Files

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

A General Integer-Programming-Based Framework for Sensor Placement in Municipal Water Networks

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2004 .

Optimal booster station placement considering various reaction dynamics.

Katherine A. Klise, Carl D. Laird, Terranna Haxton, 2012 .

R&D 100, 2016: Pyomo 4.0 – Python Optimization Modeling Objects

John Daniel Siirola, Carl D. Laird, William E. Hart, 2016 .

Designing Contamination Warning Systems for Municipal Water Networks Using Imperfect Sensors

Robert D. Carr, Cynthia A. Phillips, Jonathan W. Berry, 2009 .

Measurement and classification of retinal vascular tortuosity

Michael H. Goldbaum, William E. Hart, Paul Kube, 1999, Int. J. Medical Informatics.

What?s New in Coopr: Modeling Complex Systems with Blocks.

David L. Woodruff, John Daniel Siirola, William E. Hart, 2012 .

Data Command Files

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

Pyomo — Optimization Modeling in Python

David L. Woodruff, Carl D. Laird, William E. Hart, 2012, Springer Optimization and Its Applications.

Automated docking using a Lamarckian genetic algorithm and an empirical binding free energy function

David S. Goodsell, Arthur J. Olson, William E. Hart, 1998 .

SGOPT User Manual Version 2.0

William E. Hart, W. Hart, 2003 .

An Introduction to the COLIN Optimization Interface

William E. Hart, W. Hart, 2003 .

Evolutionary pattern search algorithms

William E. Hart, W. Hart, 1995 .

Structured Modeling with Blocks

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

Massively Parallel Mixed-Integer Programming: Algorithms and Applications

Cynthia A. Phillips, William E. Hart, Jonathan Eckstein, 2006, Parallel Processing for Scientific Computing.

Formulation and Optimization of Robust Sensor Placement Problems for Drinking Water Contamination Warning Systems

William E. Hart, Jean-Paul Watson, Regan Murray, 2009 .

Sensor Placement to Satisfy Water Security and Operational Objectives.

Robert D. Carr, Jonathan W. Berry, Cynthia Ann Phillips, 2006 .

Real-time inversion in large-scale water networks using discrete measurements

Carl D. Laird, William E. Hart, Sean A. McKenna, 2012, Comput. Chem. Eng..

Pyomo : Python Optimization Modeling Objects.

John Daniel Siirola, Carl D. Laird, William E. Hart, 2010 .

Differential Algebraic Equations

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

On the computational complexity of sequence design problems

William E. Hart, 1997, RECOMB '97.

Mathematical Modeling and Optimization

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

Evolutionary pattern search algorithms for unconstrained and linearly constrained optimization

William E. Hart, W. Hart, 2001, IEEE Trans. Evol. Comput..

Lattice and Off-Lattice Side Chain Models of Protein Folding: Linear Time Structure Prediction Better than 86% of Optimal

William E. Hart, Sorin Istrail, 1997, J. Comput. Biol..

Using Python and the Algebraic Modeling Language Pyomo to Specify Solve and Analyze Mathematical Programs.

David L. Woodruff, John Daniel Siirola, William E. Hart, 2013 .

Pyomo Modeling Strategies

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

Scalability of Integer Programming Computations for Sensor Placement in Water Networks

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2005 .

PANTHER. Pattern ANalytics To support High-performance Exploitation and Reasoning.

William E. Hart, Kristina Rodriguez Czuchlewski, 2015 .

PySP: modeling and solving stochastic programs in Python

David L. Woodruff, William E. Hart, Jean-Paul Watson, 2012, Mathematical Programming Computation.

Minimize Impact or Maximize Benefit: The Role of Objective Function in Approximately Optimizing Sensor Placement for Municipal Water Distribution Networks

Cynthia Ann Phillips, William E. Hart, Regan Murray, 2011 .

Dynamic Multi-Sensor Multi-Mission Optimal Planning Tool.

William E. Hart, Jean-Paul Watson, Scott A. Mitchell, 2016 .

Water Security Toolkit User Manual Version 1.2.

David Hart, Katherine A. Klise, John Daniel Siirola, 2014 .

Model Components: Sets and Parameters

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

Rethinking a Pythonic Modeling Architecture.

William E. Hart, Jean-Paul Watson, 2009 .

Invariant Patterns in Crystal Lattices: Implications for Protein Folding Algorithms

William E. Hart, Sorin Istrail, W. Hart, 1995, J. Univers. Comput. Sci..

Robust optimization of contaminant sensor placement for community water systems

Harvey J. Greenberg, Robert D. Carr, Cynthia A. Phillips, 2006, Math. Program..

Leveraging Flexible Frameworks for Agent-based Optimization.

John Daniel Siirola, William E. Hart, 2008 .

Convergence Examples of a Filter-Based Evolutionary Algorithm

William E. Hart, Lauren M. Clevenger, 2004, GECCO.

DAKOTA, A Multilevel Parallel Object-Oriented Framework for Design Optimization, Parameter Estimation, Uncertainty Quantification, and Sensitivity Analysis Version 3.0 Developers Manual (title change from electronic posting)

Michael S. Eldred, William E. Hart, Steven F. Wojtkiewicz, 2002 .

Sensor network design of contammination warning systems: A decision framework

Jonathan W. Berry, William E. Hart, James G. Uber, 2008 .

Modeling Mathematical Programs with Equilibrium Constraints in Pyomo

John Daniel Siirola, William E. Hart, 2015 .

Limited-Memory Techniques for Sensor Placement in Water Distribution Networks

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2007, LION.

Real-Time Inversion and Response Planning in Large-Scale Networks

Carl D. Laird, William E. Hart, Sean A. McKenna, 2010 .

A Theoretical Comparison of Evolutionary Algorithms and Simulated Annealing

William E. Hart, W. Hart, 1995, Evolutionary Programming.

FORMULATION AND OPTIMIZATION OF ROBUST SENSOR PLACEMENT PROBLEMS FOR CONTAMINANT WARNING SYSTEMS

William E. Hart, Jean-Paul Watson, Regan Murray, 2008 .

A Stationary Point Convergence Theory for Evolutionary Algorithms

William E. Hart, W. Hart, 1996, FOGA.

Resource Management in a Parallel Mixed Integer Programming Package

Cynthia A. Phillips, William E. Hart, Jonathan Eckstein, 1997 .

New developments in Pyomo.

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2016 .

Miscellaneous Model Components and Utility Functions

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

LDRD Final Report: Robust Analysis of Large-scale Combinatorial Applications

Harvey J. Greenberg, Robert D. Carr, Cynthia Ann Phillips, 2007 .

Mixed-Integer Programming of The Constellation Scheduling Problem.

William E. Hart, Christopher G. Valicka, Mark Daniel Rintoul, 2015 .

Spares optimization for the Lockheed Martin Joint Strike Fighter

William E. Hart, Jean-Paul Watson, Laura Painton Swiler, 2004, WSC '04.

Generalized Disjunctive Programming

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2017 .

Modeling and Optimization of Block-Composable Mathematical Programs using Coopr.

John Daniel Siirola, William E. Hart, Jean-Paul Watson, 2012 .

Automated docking using a Lamarckian genetic algorithm and an empirical binding free energy function

David S. Goodsell, Arthur J. Olson, William E. Hart, 1998, J. Comput. Chem..

On the Placement of Imperfect Sensors in Municipal Water Networks

Robert D. Carr, Jonathan W. Berry, William E. Hart, 2008 .

Sensor Placement in Municipal Water Networks

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2003 .

Lattice and off-lattice side chain models of protein folding (extended abstract): linear time structure prediction better than 86% of optimal

William E. Hart, Sorin Istrail, 1997, RECOMB '97.

Analyzing Structured Optimization Models with Automatic Transformations.

John Daniel Siirola, William E. Hart, 2014 .

COLIN: Optimization Infrastructure for Hybrid Algorithms.

John Daniel Siirola, William E. Hart, 2011 .

A Convergence Analysis of Unconstrained and Bound Constrained Evolutionary Pattern Search

William E. Hart, W. Hart, 2001, Evolutionary Computation.

Water Quality Sensor Placement in Water Networks with Budget Constraints

Cynthia A. Phillips, Thomas M. Walski, Jonathan W. Berry, 2005 .

DAKOTA, A Multilevel Parallel Object-Oriented Framework for Design Optimization, Parameter Estimation, Uncertainty Quantification, and Sensitivity Analysis Version 3.0 Reference Manual

Michael S. Eldred, William E. Hart, Steven F. Wojtkiewicz, 2001 .

FAST - A Framework for Agile Software Testing v. 2.0

Jonathan W. Berry, Cynthia Ann Phillips, William E. Hart, 2009 .

Sequential Stopping Rules for Random Optimization Methods with Applications to Multistart Local Search

William E. Hart, 1998, SIAM J. Optim..

On the Application of Evolutionary Pattern Search Algorithms

William E. Hart, W. Hart, 1997, Evolutionary Programming.

A Stochastic Programming Formulation for Disinfectant Booster Station Placement to Protect Large-Scale Water Distribution Systems

Katherine A. Klise, Carl D. Laird, William E. Hart, 2012 .

Comparing Evolutionary Programs and Evolutionary Pattern Search Algorithms: A Drug Docking Application

William E. Hart, W. Hart, 1999, GECCO.

The Role of Objective Function Sense in Approximately Optimizing Sensor Placement for Municipal Water Distribution Systems.

Cynthia Ann Phillips, William E. Hart, Regan Murray, 2013 .

Memetic Evolutionary Algorithms

William E. Hart, Natalio Krasnogor, Jim Smith, 2005 .

On The Convergence Properties Of A Simple Self-adaptive Evolutionary Algorithm

William E. Hart, Lauren Ferguson, John DeLaurentis, 2002, GECCO.

Stochastic Programming Extensions

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

Locally-Adaptive and Memetic Evolutionary Pattern Search Algorithms

William E. Hart, W. Hart, 2003, Evolutionary Computation.

Parallel Algorithm Design for Branch and Bound

David A. Bader, Cynthia A. Phillips, William E. Hart, 2005 .

Protein structure prediction with evolutionary algorithms

William E. Hart, Natalio Krasnogor, David A. Pelta, 1999 .

Optimal Monitoring Location Selection for Water Quality Issues.

William E. Hart, Dominic L. Boccelli, 2007 .

A naturalistic decision making model for simulated human combatants

William E. Hart, James C. Forsythe, Keith O. Hunter, 2000 .

PICO: An Object-Oriented Framework for Branch and Bound

Cynthia A. Phillips, William E. Hart, Jonathan Eckstein, 2000 .

The PyUtilib Component Architecture.

John Daniel Siirola, William E. Hart, John D. Siirola, 2010 .

Mixed-Integer Formulations for Constellation Scheduling.

William E. Hart, Scott A. Mitchell, Stephen Rowe, 2015 .

Multilevel parallelism for optimization on MP computers - Theory and experiment

Michael S. Eldred, William E. Hart, Bart G. Van Bloemen Waanders, 2000 .

Leveraging Model Transformations in Algebraic Modeling Systems.

John Daniel Siirola, William E. Hart, Jean-Paul Watson, 2015 .

Critiquing Coopr?s Modeling and Analysis Environment.

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2012 .

Analysis of the numerical effects of parallelism on a parallel genetic algorithm

Scott B. Baden, Scott R. Kohn, William E. Hart, 1996, Proceedings of International Conference on Parallel Processing.

Modeling Bilevel Programs in Pyomo.

John Daniel Siirola, William E. Hart, Jean-Paul Watson, 2016 .

Pico: An Object-Oriented Framework for Parallel Branch and Bound *

Cynthia A. Phillips, William E. Hart, Jonathan Eckstein, 2001 .

EXACT Software Repository v 1.1

Jonathan W. Berry, Cynthia Ann Phillips, William E. Hart, 2007 .

Discrete sensor placement problems in distribution networks

William E. Hart, Tanya Y. Berger-Wolf, Jared Saia, 2005, Math. Comput. Model..

Enabling department-scale supercomputing

David S. Greenberg, Cynthia A. Phillips, William E. Hart, 1999 .

Nonlinear Programming with Pyomo

David L. Woodruff, Carl D. Laird, William E. Hart, 2012 .

Tackling Large-scale Optimization Problems within a Python-based Modeling Environment (Pyomo).

John Daniel Siirola, William E. Hart, Jean-Paul Watson, 2011 .

DAKOTA , A Multilevel Parallel Object-Oriented Framework for Design Optimization , Parameter Estimation , Uncertainty Quantification , and Sensitivity Analysis Version 4 . 0 User ’ s Manual

Michael S. Eldred, Daniel M. Dunlavy, William E. Hart, 2006 .

Combinatorial optimization for national security applications.

Michael A. Bender, Cynthia Ann Phillips, William E. Hart, 2014 .

Parallelization Issues for MINLP.

Cynthia Ann Phillips, William E. Hart, 2008 .

Performance: Model Construction and Solver Interfaces

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2021, Pyomo — Optimization Modeling in Python.

Performance Portability in the Exascale Computing Project: Exploration Through a Panel Series

Rajeev Thakur, William E. Hart, Anshu Dubey, 2021, Computing in Science & Engineering.

A Brief Python Tutorial

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2021 .

Scripting Custom Workflows

David L. Woodruff, John Daniel Siirola, Carl D. Laird, 2021 .

A comparison of computational methods for the maximum contact map overlap of protein pairs.

Robert D. Carr, William E. Hart, Giuseppe Lancia, 2003 .

Water Quality Event Detection.

William E. Hart, Eric D. Vugrin, David Hart, 2008 .

Automated Docking of Flexible Ligands to Flexible Receptors

David S. Goodsell, Arthur J. Olson, William E. Hart, 2010 .

Protein Structure Prediction with Lattice Models

William E. Hart, W. Hart, 2006 .

The Computational Complexity of Protein Structure Prediction in Simple Lattice Models

William E. Hart, 2003 .

Risk Reduction and Sensor Network Design

William E. Hart, Regan Murray, Robert Janke, 2009 .

Carbon Sequestration in Synechococcus Sp.: From Molecular Machines to Hierarchical Modeling

Nagiza F. Samatova, Ying Xu, Steven J. Plimpton, 2002 .

Convergence of a discretized self-adaptive evolutionary algorithm on multi-dimensional problems.

William E. Hart, John M. DeLaurentis, 2003 .

OPTIMAL DETERMINATION OF GRAB SAMPLE LOCATIONS AND SOURCE INVERSION IN LARGE-SCALE WATER DISTRIBUTION SYSTEMS

Carl D. Laird, William E. Hart, Sean Andrew McKenna, 2011 .

Crystallographical universal approximability: A complexity theory of protein folding algorithms on c

William E. Hart, Sorin Istrail, W. Hart, 1995 .

SPOT: A Sensor Placement Optimization Toolkit for Drinking Water Contaminant Warning System Design.

Cynthia A. Phillips, Jonathan W. Berry, William E. Hart, 2007 .

Optimal seasonal irrigation application analysis.

William E. Hart, Donald I. Norum, Gideon Peri, 1980 .

Opportunities for Combinatorial Optimization

Harvey J. Greenberg, William E. Hart, Giuseppe Lancia, 2004 .

Improved Evolutionary Hybrids for Flexible Ligand Docking in Autodock

William E. Hart, Garrett M. Morris, Richard K. Belew, 2000 .

Lattice and Off-Lattice Side Chain Models of Protein Folding: Linear Time Structure Prediction Better Than 86% of Optimal (Extended Abstract)

William E. Hart, Sorin Istrail, W. Hart, 1996, RECOMB 1997.

Blaney-Criddle Coefficients for Western Turf Grasses

William E. Hart, Ian L. Pepper, Larry O. Pochop, 1981 .

Irrigation Performance: An Evaluation

Gaylord V. Skogerboe, William E. Hart, Gideon Peri, 1979 .