Western hemlock-Sitka spruce forests, where prior precommercial thinning has occurred, constitute one of the most productive
young-growth management types along the Pacific Coast from Oregon to southeast Alaska. These stands are ready for a first commercial thinning entry, however, the costs and benefits of such entries and resulting impacts at...
The use of logistic-type growth curves in the prediction of future engineering manpower utilization patterns is a viable technique. When a work environment consists of a large number of repetitive type project the use of regression analysis and Weibull curve shapes gives a reliable forecast of the time-phased utilization of...
The focus of this research is to develop a personal computer based simulation model of the mechanized logging process, from felling until the log arrives at the sawmill. The SLAM II simulation language is used for modeling, and the main emphasis is on the overall performance of this system, and...
Strip thinning is recognized as a way of commercial thinning
young-growth stands. strip thinning has been used worldwide. The
purpose of this study was to explicitly evaluate the costs and benefits
associated with skyline strip thinning in young Douglas-fir
(Pseudotuqo menzesii Franco) stands in the Pacific Northwest and to
compare...
Training of woodsworkers is described as important for the logging industry in
Oregon. There has been little documentation of training gains or research that measures
the effects of training from the perspective of the logging firm. Learning theories are
evaluated and Towill's form of learning curves are selected for an...
The peat swamp forests of Sarawak are an important
resource in the context of the socio-economic development
of the state. Logging is the main activity in these forests.
In the absence of an economical mechanized system, the
method of harvesting has evolved into a highly organized
effective manual system. Though...
This paper describes a study done on swinging and processing whole tree, tree length and log length pieces in a smallwood Douglas-fir thinning. Two machines were evaluated, a 70 horsepower rubber tired skidder and a hydraulic loader mounted on a 6 x 4 live tandem truck.
The study took place...
To improve the present state of Forestry and the
condition of forest workers is an important goal to be achieved in developing countries. With the growth of population, demand for wood products is increasing tremendously. Prices have gone up manyfold. One way to meet this demand is to increase productivity...
This paper represents preliminary engineering analysis on the pendulum swing balloon system. It also describes an
analysis of measurements taken in the summer o.f 1982,
during a field test of a 37,000-foot3 balloon used as a
prototype model under static conditions. This work
established the influence of important variables on...
The purpose of this study was to determine the significant
variables influencing the damage levels sustained by the residual
stand after skyline thinning of coniferous stands. Damage levels were
measured in ten study areas in western Oregon that had received their
first commercial thinning.
For this post-logging study, 38 units...
