John E. Tyworth
Professor Emeritus
John J. Coyle Endowed Professor of Supply Chain Management
Since joining the Smeal College, Dr. Tyworth has taught graduate and undergraduate courses in supply chain and logistics management. His work experience includes traffic management and air cargo operations. He was an active duty officer in the Air Force from 1967-71, when he performed transportation/logistics duties under the Strategic Air Command and the 14th Air Force (RVN). In addition, he continued his service from 1976-1994 as reserve officer in the acquisition/procurement area for HQ Air Force and later for DLA. He also has consulting experience with major companies in the railroad, trucking, air cargo, food products, forest products, wire and cable, offshore rig/platform supply, and information technology industries.
Expertise
Dr. Tyworth's research interests lie in the areas of total landed cost engineering, transport mode choice, and product availability levers
Education
Ph D in Logistics, University of Oregon, Lundquist College of Business, Eugene, OR, 1975-12-01 MBA in Logistics, University of Oregon, Lundquist College of Business, Eugene, OR, 1973-01-01 BA in Economics, University of California, Santa Barbara, Santa Barbara, CA, 1966-01-01
Courses Taught
B A 302 – Supply Chains
Introduction to key elements and strategic importance of supply chain networks.
B LOG 421 – Logistics Analysis
Design, develop, and use computer decision models for analysis of logistics problems; computer intensive coursework emphasizing spreadsheet applications.
B LOG 496 – Independent Studies
Creative projects, including research and design, which are supervised on an individual basis and which fall outside the scope of formal courses.
B LOG 538 – Trnspn & Ph Dist
Control of the movement of goods; coordination of supply and demand in creation and maximization of time and place utility.
B LOG 596 – Individual Studies
Creative projects, including nonthesis research, which are supervised on an individual basis and which fall outside the scope of formal courses.
SC&IS 421 – Supply Chain Modeling and Analysis
Problem solving and modeling methods for analyzing supply chains management.
SC&IS 496 – Independent Studies
Creative projects, including research and design, that are supervised on an individual basis and that fall outside the scope of formal courses.
SC&IS 596 – Individual Studies
Creative projects, including nonthesis research, that are supervised on an individual basis and which fall outside the scope of formal courses. A specific title may be used in each instance and will be entered on the student's transcript.
SCM 421 – Supply Chain Analytics
Problem solving and modeling methods for analyzing supply chains management.
SCM 496 – Independent Studies
Creative projects, including research and design, that are supervised on an individual basis and that fall outside the scope of formal courses.
SCM 546 – Strategic Procurement
Development of procurement and supply management strategies to support synchronized supply chains.
SCM 596 – Individual Studies
Creative projects, including nonthesis research, that are supervised on an individual basis and which fall outside the scope of formal courses.
SCM 597F – Demand Planning (F)
Special Topics (1-9) Formal courses given on a topical or special interestsubject which may be offered infrequently; several different topics may betaught in one year or semester.
SCM 810 – Transportation & Distribution Management
Part of on-line MPS/SCM Program
SCM 810 – Transportation and Distribution
Role of transportation and distribution operations in matching supply withdemand; principles of transport industry analysis and competitivepositioning.
Selected Publications
Tyworth J. E., Saldahna J. "The Lead-Time Reliability Paradox and Inconsistent Value-of-Reliability Estimates" Transportation Research Part E, vol. 70, 2014-10-01
Hayya J. C., Ramasesh R. V., Tyworth J. E., Kim J. G., Sun D. "JIT Delivery with Stochastic Lead Time" Journal of Operations Research Society, vol. 1, 2013-06-01
Saldahna J., Tyworth J. E., Swan P., Russell D. "Cutting Logistics Costs with Ocean Carrier Selection" Journal of Business Logistics, vol. 30, 2009-01-01
Tyworth J. E., Saldahna J., Swan P., Russell D. "Door-to-Door Logistics Cost in Global Supply Chains" Proceedings of Fifth International Conference on Supply Chain and Information Systems, 2007-12-01
Thomas D. J., Tyworth J. E. "Is Pooling Lead-Time Risk by Splitting Orders Simultaneously Worthwhile?" Journal of Business Logistics, vol. 28, 2007-01-01
Saldahna J., Russell D. M., Tyworth J. E. "A Disaggregate Analysis of Ocean Carriers Transit Time Performance" Transportation Journal, vol. 45, 2006-01-01
Thomas D. J., Tyworth J. E. "Pooling Lead-Time Risk by Order Splitting: A Critical Review" Transportation Research, Part E, vol. 42, 2006-01-01
Freimer M., Thomas D. J., Tyworth J. E. "The Value of Setup Cost Reduction and Process Improvement for Economic Production Quantity Model with Defects" European Journal of Operations Research, vol. 173, 2006-01-01
Suzuki Y., Tyworth J. E., Novack R. A. "Airline Market Share and Customer Service Quality: A Reference Dependent Model" Transportation Research A, vol. 35, 2001-01-01
Swan P., Tyworth J. E. "Shipper Sensitivity to Unreliable Service in Carload Markets" Transportation Journal, vol. 40, 2001-01-01
Tyworth J. E., Ganeshan R. "A Note on the Solution to the <Q, r> Inventory Model for Gamma Lead-Time Demand" International Journal of Physical Distribution and Logistics Management, vol. 30, 2000-01-01
Tyworth J. E., Ruiz-Torres A. "Transportation’s Role in Sole Versus Dual Sourcing Decision" International Journal of Physical Distribution and Logistics Management, vol. 30, 2000-01-01
Ganeshan R., Tyworth J. E., Guo Y. "Dual-Sourced Supply Chains: The Discount Supplier Option" Transportation Research E, vol. 35, 1999-01-01
Suzuki Y., Tyworth J. E. "A Theoretical Framework for Modeling Sales-Service Relationships in the Transportation Industry" Transportation Research E, vol. 34, 1998-01-01
Tyworth J. E., Zeng A. Z. "Estimating the Effects of Carrier Transit-Time Performance on Logistics Cost and Service" Transportation Research A, vol. 32, 1998-01-01
Tyworth J. E., O'Neil L. "Robustness of the Normal Approximation of Lead-Time Demand in a Distribution Setting" Naval Logistics Research, vol. 44, 1997-01-01
Tyworth J. E., Guo Y., Ganeshan R. "Inventory Control Under Gamma Demand and Random Lead Time" Journal of Business Logistics, vol. 17, 1996-01-01
Rao K., Grenoble W. L., Tyworth J. E. "Railroad Network Models: A Case Study of the Adoption Process" Journal of the Transportation Research Forum, vol. 34, 1994-01-01
Tyworth J. E. "Modeling Transportation-Inventory Trade-Offs in a Stochastic Setting" Journal of Business Logistics, vol. 17, 1992-01-01
Tyworth J. E., Rao K., Stenger A. J. "A Logistics Cost Model for Purchasing Transportation to Replenish High Demand Items" Journal of the Transportation Research Forum, vol. 32, 1991-01-01
Tyworth J. E., Grenoble W. L. "Spreadsheet Modeling in Logistics: Advancing Today's Educational Tools" Journal of Business Logistics, vol. 12, 1991-01-01
Tyworth J. E., Lemmon P., Ferrin B. "Improving LTL Delivery Service Quality with Statistical Process Control" Transportation Journal, vol. 25, 1989-01-01
Chu Te G., Tyworth J. E. "Forecasting Cash Flows for Contracted Highway Projects: A Case Study" Journal of the Transportation Research Forum, vol. 27, 1986-01-01
Koot R., Tyworth J. E. Track Quality Measurement by Multivariate Statistical Analysis, vol. 25, 1985-01-01
Horn K., Tyworth J. E. "The Impact of Railroad Boxcar Deregulation: A Case Study of Transcontinental Lumber" Journal of the Transportation Research Forum, vol. 25, 1983-01-01
Koot R., Tyworth J. E. "The Determination of Track Maintenance Spending" Transportation Journal, vol. 21, 1981-01-01
Tyworth J. E., Koot R. "The Impact of General Rail Rate Increases on the Penetration of Midwestern Lumber Markets" Transportation Research E: Logistics and Transportation Review, vol. 17, 1981-01-01
Tyworth J. E., Spychalski J. C., Reinschmidt A. "The Role of FRA Track Safety Standards in the Decision Framework for Maintenance-of-Way Spending" ICC Practitioners Journal, vol. 48, 1981-01-01
Tyworth J. E., Reinschmidt A. "The Role of Safety and Train Speed in Track Maintenance Spending Decisions: A Case Analysis" Traffic Quarterly, vol. 35, 1981-01-01
Tyworth J. E. ""On the Transportation Use Controversy: An Analysis of Car Service and Boxcar Utilization in the Movement of Food Products" Transportation Journal, vol. 19, 1980-01-01
Tyworth J. E. "The Effects of Incentive Per Diem on the Utilization of Plain Boxcars" Journal of the Transportation Research Forum, vol. 21, 1980-01-01
Tyworth J. E. "Pricing Private Freight Car Service: An Analysis of Transporta¬tion Use and the Problem of Standby Car Capacity" ICC Practitioners Journal, vol. 46, 1979-01-01
Tyworth J. E. "The Analysis of Shipper Operating Policies and Private Freight Car Utilization" Transportation Journal, vol. 17, 1977-01-01