## 3 Results  
Figure 4 shows the exhaust gas temperature and maximum combustion pressure in all voyages, including the anomaly data of cylinder 1. It increases with increasing RPM of the engine, and the exhaust gas temperature and combustion pressure in the same RPM section change considerably depending on the operating environment, such as the engine load. In addition, the high temperature alarm standard of the propulsion engine cylinder exhaust gas in the AMS is 450 \({}^{\circ}\)C (yellow dotted line in Figure 4a, the standard temperature for propulsion engine SHUT DOWN or SLOW DOWN is 470 \({}^{\circ}\)C (red dashed line in Figure 4a)). Therefore, if the temperature of the cylinder exhaust gas is less than 450 \({}^{\circ}\)C, it is determined as a normal operation state. As shown in Table 7, the average exhaust gas temperature of cylinder 1 during the voyages was 323.9 \({}^{\circ}\)C. The temperature range is from a minimum of 40.1 \({}^{\circ}\)C to a maximum of 378.6 \({}^{\circ}\)C. There is a big difference from the high temperature alarm standard, and the normal operating condition range is wide. Therefore, the data of VOYAGE (21123) with anomalistic symptoms are also included in the normal operating range, and criteria and algorithms for determining abnormal signs are required. Thus, a propulsion engine anomalistic symptom judgment algorithm was constructed using the MCCV via Equation (4). Figure 4: Conditions of cylinder 1. (**a**) EXH: exhaust gas temperature; (**b**) MAX: cylinder pressure (source: own elaboration, Python 3.8.3). Tables 8 and 9 present the results of the CET and maximum CCP from the normal operating state database of the propulsion engine. When the propulsion engine is operated at a constant speed of 133 RPM or higher, the minimum/maximum difference in the CET is \(\sim\)60 \({}^{\circ}\)C, depending on the operating environment of the engine, and the average exhaust gas temperature of each cylinder is different. The maximum CCP varies from cylinder to cylinder, with a minimum/maximum difference of \(\sim\)60 kgf/cm\({}^{2}\); the average pressure differs from cylinder to cylinder. Therefore, it is necessary to set the standard operating range of the MCCV for each cylinder. Figure 5 shows the MCCV data of cylinder 1 in a normal operating state for each voyage based on the running time and RPM. The MCCV tended to decrease owing to changes in the navigating environment, such as changes in ME ORDER RPM and the lowering of the scavenge air temperature with the progression of the voyage. The yellow dotted line in Figure 5 is the Concern (1) level, and the red dashed line is the Abnormal (2) level. \begin{table}
\begin{tabular}{c c c} \hline \hline  & **CYL1 EXH. Gas Temp. (\({}^{\circ}\)C)** & **CYL1 MAX. PRESS. (kgf/cm\({}^{2}\))** \\ \hline Mean & 323.9 & 153.6 \\ Std. & 50.3 & 31.2 \\ Min. & 40.1 & 43.8 \\ Max. & 378.6 & 198.4 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Condition data of cylinder 1 (source: own elaboration). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Cylinder** & **1** & **2** & **3** & **4** & **5** & **6** \\ \hline Mean (\({}^{\circ}\)C) & 347.6 & 359.3 & 356.6 & 361.1 & 362.4 & 370.0 \\ Std. (\({}^{\circ}\)C) & 5.7 & 6.8 & 7.9 & 7.1 & 7.9 & 6.1 \\ Min. (\({}^{\circ}\)C) & 328.7 & 332.1 & 329.0 & 335.9 & 335.5 & 346.3 \\ Max. (\({}^{\circ}\)C) & 374.4 & 391.7 & 385.6 & 393.1 & 397.9 & 401.9 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Cylinder exhaust gas temperature data (source: own elaboration). Figure 5: MCCV of the normal operating condition of cylinder 1 based on (**a**) running time and (**b**) power (source: own elaboration, Python 3.8.3).