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Research Interests
Harvesting system productivity, economic
evaluation of environmental impacts caused by harvesting, value
recovery, supply chain management
Current Programs
Production economics and impacts of alternative
silvicultral systems, small timber harvesting systems, smart
sensor systems for improved wood utilization, scanning for value
on mechanized
harvesters.
Courses
- FE 440/540: Logging Operations Analysis
- FE 441/541: Production Planning and Control
in Logging
Other Interests:
fishing, back-packing, Toastmasters
Selected Publications
Acuna, M., G.E. Murphy. 2006. Use of near infrared spectroscopy and
multivariate analysis to predict wood density of Douglas-fir from chain saw chips.
Forest Products Journal 56(11/12):67-72.
Toman, E., A. Skaugset, G.E. Murphy. 2007. An analysis of the opportunity costs
with wet weather timber hauling. International Journal of Forest Engineering 18(1):17-23.
Acuna, M., G.E. Murphy. (in press) Estimating log prices of
Douglas-fir through an economic analysis of the effects of wood
density on lumber recovery and pulp yield. Forest products Journal
(accepted May 2006)
Murphy, G.E., M. Acuna, D. Amishev. 2006. Adaptive control
of bucking on harvesters: target and timing effects. Forest Products
Journal 56(11/12):79-83.
Marshall, H., G.E. Murphy, K. Boston. 2006. Evaluation
of the economic impacts of length and diameter measurement error
on mechanical processor/harvesters. Canadian Journal of Forest
Research 36:1661-1673.
Marshall, H.D., G.E. Murphy, B. Gartner. 2006. Effects
of Bark thickness on optimal log merchandizing. Forest products
Journal 56(11/12):87-92.
Stander, H., G.E. Murphy. 2006. Robust optimization of forest
transportation networks: a case study. Paper presented at the
20069 Council on Forest Engineering Conference, Coeur de Alene,
Idaho, July 2006.
Marshall, H.D., G.E. Murphy, K. Boston. 2006. Three mathematical
models for bucking-to-order. Silva fennica 40(1): 127-142.
Acuna, M., G.E. Murphy. 2006. geospatial and within tree variation
of wood density and spiral grain in Douglas-fir. Forest Products
Journal 56(4):81-85.
Murphy, G.E., I. Wilson, K. Barr. 2006. Developing methods
for pre-harvest inventories which use the harvester as the sampling
tool. Australian Journal of Forestry 69(1):9-15.
Murphy, G.E., Marshall, H., Evanson, T. 2005.
Production speed effects on log-making error rates and value
recovery for a mechanized processing operation in
Radiata
pine. Southern African Forestry Journal 204:23-35.
Murphy, G.E., Wing, M. 2005. Road
sediment yields from dispersed versus clustered forest harvesting
activity: a case study. International Journal of Forest Engineering
16(2):65-72.
Hayes, J.P., S.H. Schoenholtz, M.J. Hartley, G.E. Murphy, R.F,
Powers, D. Berg, S.R. Radosevich. 2005. Environmental consequences
of intensively managed forest plantations in the Pacific Northwest.
Journal of Forestry 103(2):83-87.
Murphy, G.E., W..R.J. Sutton, D. Hill, C. Chambers, C. Blinkley,
D. Creel, D. New. 2005. Economics of intensively managed plantation
forestry in the Pacific Northwest. Journal of Forestry 103(2):
78-82.
Carey, P., G.E. Murphy. 2005. Mechanized versus motor-manual
log-making in two Chilean Pinus radiata stands. New Zealand Journal
of Forestry Science 35(1)
Murphy, G.E.. 2005. Determining sample size for harvesting
cost estimation. New Zealand Journal of Forestry Science 35(2/3):139-152.
Acuna, M., G.E. Murphy. 2005. Optimal bucking of Douglas-fir
taking into consideration external properties and wood density.
New Zealand Journal of Forestry Science 35(2/3):139-152.
Murphy, G.E., Marshall, H., Bolding, M.C.
2004. Adaptive control of bucking on harvesters to meet order
book constraints. Forest Products Journal 54(12):114-121.
Murphy, G.E., Marshall, H., Conradie, I.
2004. Market complexity and its effect on variables that gauge
the economics of harvesting production. New Zealand Journal of
Forestry Science 33(2):281-292.
Conradie, I., Greene, W.D., Murphy, G.E.
2004. Value recovery with harvesters in southeastern USA pine
stands. Forest Products Journal 54(12):80-84.
Murphy, G.E., Franich, R. 2004. Early experience
with aroma tagging and electronic nose technology for log tracking.
Forest Products Journal 54(2):28-35.
Marshall, H., Murphy, G.E. 2004. Economic
evaluation of implementing improved stem scanning systems on mechanical
harvester/processors. New Zealand Journal of Forestry Science
34(20:158-174.
Murphy, G.E., Firth, J., Skinner, M.F. 2004.
Long-term impacts of forest harvesting related soil disturbance
on log product yields and economic potential in a New Zealand
forest. Silva Fennica 38(3):279-289.
Murphy, G.E., Firth, J. 2004. Soil disturbance
impacts on early growth and management of radiata pine trees in
New Zealand. Western Journal of Applied Forestry 19(2):109-116.
Murphy, G.E. 2003. Procedures for scanning
radiata pine stem dimensions and quality on mechanised processors.
International Journal of Forest Engineering 14(2):91-101.
Boston, K., Murphy, G.E. 2003. Value recovery
from two mechanized log-bucking operations in the southeastern
United States. Southern Journal of Applied Forestry 27(4):259-263.
Murphy, G.E., Siren, M., O'Brien, S. 2003.
Potential use of slash bundling technology in Western US stands.
In: Proceedings of Council on Forest Engineering Conference, Bar
Harbor, Maine. September, 2003.
Marshall, H., Murphy, G.E. 2003. Factors
affecting the accuracy of weighbridge systems. International Journal
of Forest Engineering. 14(1):67-79
Murphy, G.E. 2003. Reducing trucks on the
road through optimal route scheduling and shared transportation
services. Southern Journal of Applied Forestry. 27(3):198-205.
Murphy, G.E. 1998. Allocation of stands
and cutting patterns to logging crews using a tabu search heuristic.
Journal of Forest Engineering 9(1):31-38.
Tian, X. Murphy, G.E. 1997. Detection of
trimmed and occluded braches on harvested tree stems using texture
analysis. Journal of Forest Engineering. Vol. 8 No.2, :65-78.
Selected Recent Theses
Acuna, M.A. 2006. Wood properties and use of sensor technology
to improve optimal bucking and value recovery of Douglas-fir.
PhD.
Marshall, H. 2005. An investigation of factors
affecting the optimal output log distribution from mechanical
harvesting and processing systems. PhD thesis. Oregon State University.
200pp.
Xin, Tian. 1999. An application of computer
vision technologies to log defect determination. PhD thesis. Lincoln
University, New Zealand. 329pp.
Cossens, G.P. 1996. Optimization of short
term log allocation. Master of Applied Science, Lincoln University,
New Zealand. 118pp.
Presentations
Mechanization and value recovery: worldwide
experience. Production Forestry Workshop, Expocorma, Concepcion,
Chile. November 2004.
Modeling effect of measurement error on
optimal bucking. INFORMS Conference, Denver, Colorado, October
2004. (with coauthors Hamish Marshall and Kevin Boston)
Harvest planning to sustain value along
the forest-to-mill supply chain. Productivity of Western Forests
Conference, Kamilche, Washington, September 2004. (with coauthor
Paul Adams)
Costs and benefits of four procedures for
scanning on mechanical processors. 2nd International Forest Engineering
Conference, Vaxjo, Sweden. May, 2003. (with coauthor Hamish Marshall).
Production economics of mechanized CTL systems.
Weyerhaeuser Western Timberlands Forest Engineering Forum, Kelso,
Washington, March 2002.
Professional Activities
Forest Products Society, Timber Harvesting
and Production Technical Interest Group. Chair 2002-2005.
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