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UBC Theses and Dissertations
Effect of yarding operations on log recovery value Copithorne, Robert Dalgleish
Abstract
This thesis deals with the problem of controlling losses in log recovery value in yarding operations. It is believed that losses under current operating methods can be substantial over time. The objective is to find ways of applying statistical quality control methods to controlling and reducing these losses. A literature review was done to determine the statistical techniques available. A pilot study was done concurrently to determine the current levels of value loss and test methods of measuring value loss. The final step was to recommend a procedure for monitoring and controlling log value losses based on the findings of the literature review and the pilot study. Value loss estimates in the pilot study were consistent with losses discussed in the literature (1-2%). The problems encountered with the methods used in the pilot study, however, were believed to be severe enough to limit the usefulness of the methods and the results. The methods were found to be cumbersome and time consuming as well as needing considerable refinement in the area of scaling and grading for true value recognition. The recommended statistical quality control method can be used operationally without the necessity of immediate improvement of scaling and grading techniques. The method involves observing occurrences of log damage and recording detailed information related to those occurrences so that the causes of the damage can determined. Procedures can then be developed to correct these causes. The method relies on the use of statistical control charts for attributes for monitoring log damage and highlighting periods of abnormal results for further investigation.
Item Metadata
Title |
Effect of yarding operations on log recovery value
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1993
|
Description |
This thesis deals with the problem of controlling losses in log
recovery value in yarding operations. It is believed that losses
under current operating methods can be substantial over time.
The objective is to find ways of applying statistical quality
control methods to controlling and reducing these losses.
A literature review was done to determine the statistical
techniques available. A pilot study was done concurrently to
determine the current levels of value loss and test methods of
measuring value loss. The final step was to recommend a
procedure for monitoring and controlling log value losses based
on the findings of the literature review and the pilot study.
Value loss estimates in the pilot study were consistent with
losses discussed in the literature (1-2%). The problems
encountered with the methods used in the pilot study, however,
were believed to be severe enough to limit the usefulness of the
methods and the results. The methods were found to be cumbersome
and time consuming as well as needing considerable refinement in
the area of scaling and grading for true value recognition.
The recommended statistical quality control method can be used
operationally without the necessity of immediate improvement of
scaling and grading techniques. The method involves observing
occurrences of log damage and recording detailed information
related to those occurrences so that the causes of the damage can
determined. Procedures can then be developed to correct these
causes. The method relies on the use of statistical control
charts for attributes for monitoring log damage and highlighting
periods of abnormal results for further investigation.
|
Extent |
1194540 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-21
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0075161
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.