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--- opensci:2025:ricardopesquisa:do_3 [2025/04/09 17:24] – criada ricardo
+++ opensci:2025:ricardopesquisa:do_3 [2025/04/29 21:28] (atual) – ricardo
@@ Linha 1: / Linha 1: @@
-[[ opensci:2025:modelo |{{ :opensci:2025:retornar.png?nolink&25x25}}]]
+====== Analysis of the productivity and production cost of two grapple saw ======
+----
+**Author**: [[opensci:2025:ricardo|Ricardo H. Miyajima]]
+**Overview**: The grapple saw is one of the fundamental machines in the full tree system. Being responsible for carrying out the tracing operation of the wooden beams.
+Assertiveness in the length of the wood is essential for the operation to deliver quality for the final product.
+As with other forest machines, evaluation from a technical and cost point of view becomes important in the production chain.
+**Question**: Is there a difference in productivity and production costs for two grapple of different sizes??
+**Procedures Description**: The methodology used was the study of times and motion, by the continuous time method. Two different sizes of grapple were evaluated for the tracing operation in a commercial eucalyptus forest.
+**Results Interpretation**:  Among the results, when comparing the two grapple for the productivity variable and for the production cost variable, there was no statistically significant difference.
+**Raw Data and Code used**
+  *[[https://posit.cloud/content/10232967]]
+  *[[https://github.com/ricardomiyajima/my-research/blob/main/dados_garra.xlsx]]
+**Plots Generated**
+{{:opensci:2025:ricardopesquisa:boxplot_produtividade_gruas_dados_garra.png?400|}}
+Figure 1. Box plot productivity
+{{:opensci:2025:ricardopesquisa:boxplot_custo_producao_gruas_dados_garra.png?400|}}
+Figure 2. Box plot production cost
+{{:opensci:2025:ricardopesquisa:heatmap_grua1_dados_garra.png?400|}}
+Figure 3. Correlation matrix for grapple 1
+{{:opensci:2025:ricardopesquisa:heatmap_grua2_dados_garra.png?400|}}
+Figure 4. Correlation matrix for grapple 2