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Titolo:
THE MARKING FOR BUCKING UNDER UNCERTAIN IN AUTOMATIC HARVESTING OF FORESTS
Autore:
LISKI EP; NUMMI T;
Indirizzi:
UNIV TAMPERE,POB 607 SF-33101 TAMPERE FINLAND
Titolo Testata:
International journal of production economics
, volume: 46, anno: 1996,
pagine: 373 - 385
SICI:
0925-5273(1996)46:<373:TMFBUU>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROWTH-CURVES; MAXIMUM-LIKELIHOOD; INCOMPLETE DATA; EM-ALGORITHM; MODELS; PREDICTION;
Keywords:
EM ALGORITHM; MAXIMUM LIKELIHOOD; PARSIMONIOUS COVARIANCE STRUCTURES; ROOT MEAN SQUARE ERROR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
E.P. Liski e T. Nummi, "THE MARKING FOR BUCKING UNDER UNCERTAIN IN AUTOMATIC HARVESTING OF FORESTS", International journal of production economics, 46, 1996, pp. 373-385

Abstract

The marking for bucking is the problem of converting a single tree stem into logs in such a way that the total stem value according to a given price list for logs is maximized. Proper marking for bucking is ofcrucial importance in harvesting of forests. The annual production ofsaw timber in Scandinavia is tens of millions m(3). Since, furthermore, sawn timber is by far the most valuable forest product in Scandinavia, any improvement in the marking for bucking procedure Will yield a large profit. To solve the marking for bucking problem optimally one has to know the whole tree stem. However, it is not economically feasible to run the whole stem through the measuring device before cutting. Therefore, it is a normal situation under computer-based marking for bucking that the first cutting decisions are made before the whole stemis known. In this paper the forest harvesting process will be considered under a general growth curve model useful especially for repeated-measures data. The main objective is to predict the unknown portion y(n(2)) of the current stem, which will be estimated from the stem data y(1), y(2), ... , y(n-1) on the previously processed n - 1 stems and from the known diameter values y(n(1)) on the current stem. Then a predictor of y(n(2)), say (y) over cap(n(2)), jointly with the known partyy(n(1)) is used in marking for bucking. It turns out that this technique can improve radically the efficiency of harvesting, so that our results provide important knowledge for developing automatic bucking systems of modern harvesters.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 10:07:30