## 3 Materials and Methods
### Initial AHP-QFD Matrices
#### 3.2.1 Logistic Service Site Design  
The study by [PERSON] et al. [23], focused on selecting optimal locations for cargo logistics centers, addressing multifaceted decision-making with budget constraints. The illustration of the Airport Cargo Logistic Center Site is presented in Figure 3. This illustration provides an overview of the example key components of a logistic center. The main elements include airport land features, operating handling costs, carrying conditions, and proximity to airline agents and customers. Smaller subcomponents highlight aspects such as local political regulation and law, improvement district's working, airport labor status, electrical power/utilities, and information technology status. This visual representation helps in understanding the overall design and functionality of the logistic center. Figure 3: The overview of airport cargo logistic center. These components will be analyzed as quality requirements from stakeholders, and the analysis will be conducted through AHP-QFD. The results will be presented in the structure shown in Figure 4 to aid in product design decision-making and the initial data from the analysis are displayed in Table 3.  
Components of the Matrix:  
1. Airport Cargo Logistic Center Site Criteria (quality characteristics): At the top of the matrix, lists the criteria that are considered essential for selecting the optimal site for the cargo logistics center. 2. Airport Cargo Logistic Center Site Requirements (quality requirements): On the left side of the matrix, this section outlines the specific requirements that the logistics center must meet. These requirements are derived from the needs of stakeholders such as logistics companies, airport authorities, and customers. 3. Central Relationship Matrix: The central portion of the matrix shows the relationships between the site criteria and the site requirements. Each cell within this matrix indicates the degree of correlation or impact that a particular criterion has on fulfilling a specific requirement. The strength of these relationships is typically represented using symbols or numerical values (e.g., strong (9), moderate (3), weak (1)). 4. Importance Weighting of Requirements: On the right side of the matrix, the importance weighting of each requirement is indicated. The AHP is used to measure the relative importance of the weights for each site requirement. 5. Importance Degree of Airport Cargo Logistic Center Site Criterion: At the bottom of the matrix, this row displays the importance degree of each site criterion based on its ability to meet the defined requirements. This helps prioritize the criteria that are most critical for the site selection process. 6. Normalized Importance Degree of Airport Cargo Logistic Center Site Criterion: The final row shows the normalized importance degree of each site criterion. Normalization adjusts the importance degrees so that they sum up to a specific value. Figure 4: The result structure of applying AHP-QFD for the airport cargo logistic [23]. Based on Table 3, the AHP-QFD matrix supports decision-making in selecting suitable site attributes. This study interprets the matrix results, but, as mentioned earlier, the interpretation depends on the skills and expertise of the decision-makers. In this study, the important degrees were considered in the following order of priority: the airport's operating handling costs (8.406) were deemed the most important, followed by the airport's information technology status (5.628). Next in importance was the closeness to airline agents and customers (4.227), then the local political regulations and laws (3.684). The airport's labor status (3.474) was next, followed by the airport's carrying condition (3.330), the airport's electrical power/utilities (2.868), and the airport's location conditions (2.865). Finally, the improvement district's working environment (2.727) was considered the least important among the listed factors. However, this case study indicates that results cannot be determined solely from the AHP-QFD matrix.