## 3 Results and Discussion
### Evaluation of Qualitative Yield  
For the evaluation method, a qualitative element was initially chosen. In our case, it was the amount of radial timber. According to several experiments [5; 6], radial timber is characterized by less pronounced warping or drying, which results in obtaining more dimensionally stable timber. Our results showed that the highest proportion of radial timber (qualitative yield) was achieved with quarter sawing. It significantly outperformed other types of cutting, as can be seen in Table 3.  
From the comparison of some results obtained with quarter sawing, higher qualitative (grade) yields were achieved compared to through-and-through sawing, which was also confirmed by our results. With the mentioned log-sawing patterns, the qualitative yield was found to be V\({}_{5}\) = 62.69% and V\({}_{6}\) = 47.86%. Other studies [3; 4] describe this type of cutting as a method that leads to fewer losses caused by warping, especially in beech wood. The highest yield of tangential timber was observed with cant sawing, specifically with the same cut (V\({}_{4}\)), which was characterized by the highest quantitative yield. Table 4 shows the qualitative and quantitative yields for comparison with other researchers' work [7; 17]. The comparison of the yields indicates that the wood species, the quality of the logs, and the technology used can significantly influence the resulting qualitative or quantitative yields. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Log**} & **Mid Diameter** & \multirow{2}{*}{**Length [m]**} & **Quantity** & **Bark** & **Volume** & **The Volume of** & **Quantitative** & **Waste** \\  & & **[ks]** & **[m\({}^{3}\)]** & **[m\({}^{3}\)]** & **[m\({}^{3}\)]** & **Lumber [m\({}^{3}\)]** & **Yield [\%]** & **[\%]** \\ \hline V\({}_{1}\) & 43.0 & 4.10 & 1 & 0.0345 & 0.56 & 0.37 & 66.33 & 33.67 \\ \hline V\({}_{2}\) & 45.0 & 3.95 & 1 & 0.0364 & 0.59 & 0.46 & 78.24 & 21.76 \\ \hline V\({}_{3}\) & 52.0 & 4.02 & 1 & 0.0476 & 0.80 & 0.59 & 72.95 & 27.05 \\ \hline V\({}_{4}\) & 60.5 & 4.08 & 1 & 0.0680 & 1.10 & 0.93 & **84.06** & 15.94 \\ \hline V\({}_{5}\) & 48.0 & 4.18 & 1 & 0.0439 & 0.71 & 0.45 & 62.69 & 37.31 \\ \hline V\({}_{6}\) & 50.0 & 4.01 & 1 & 0.0378 & 0.74 & 0.44 & 59.82 & 40.18 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: The results of quantitative yield using selected log-sawing patterns. **Effect of Log-Sawing Patterns on Quantitative and Qualitative Yields**  
The results were also evaluated using statistical analysis (Figure 5), which confirmed that the choice of log-sawing pattern can have an impact on the qualitative yield. This was further supported by the 2D box plot graph, which assessed the statistical results (\(p=0.0105\)) based on the determined significance level (\(p=0.05\)). On the other hand, in terms of quantitative yield, this result was not confirmed, and the value of statistical significance was well above the level of \(p=0.1721\) (Figure 6). The same differences were presented in other research [17] and the level of significance was \(p=0.057\), probably due to large variation within groups. In the evaluation of the results, we also statistically analyzed the influence of the log-sawing patterns on the resulting volume of tangential or radial timber. Here, a statistically significant difference was confirmed only in the case of radial timber, where the significance value reached \(p=0.0065\) (Figure 7). The largest average yield was discovered with quarter sawing (0.400 m\({}^{3}\)). From the point of view of tangential lumber, the highest average yield was discovered with cant sawing (0.696 m\({}^{3}\)). According to the results in [17], a higher value was discovered for cant sawing and round sawing. However, in the other research [17], the statistically significant influence of the log-sawing pattern on the qualitative yield was not confirmed (\(p=0.129\)).