## 5 Experiment and Results
### AR Visualization Service Test  
The main gate of Sejong University was selected as the target for testing the second service of the system. At this stage, the user was asked to operate the default system by performing the following steps: (1) entering user context such as age, presence of vision problems, and time of day in the first form of the system shown in Figure 10a; (2) opening the AR settings form by pressing the \"AR service 1\" button; (3) entering the AR setting parameters, such as type of text-size- and LOD-setting models (Figure 10b,c); (4) pointing the mobile camera toward the AR object--in this case, the main gate of Sejong University--and (5) pressing the AR service button (SET) to execute the AR scenario. The system procedure for this test is shown in Figure 11.  
The system test results of this step are shown for three different modes of the LOD model in Figure 12. Figure 12a shows the real object selected for the experiment herein. Figure 12b shows the output on running the LOD Model 1 setting, which displays all information (9 information fields) for the user located near the visited object. Notably, proximity (being near the visited object) is defined by the system via a threshold of 15 m. This implies that if the distance between the user and the visited object does not exceed this threshold, all of the information concerning the visited object is displayed. At this location, the \"LOD Model 2\" setting yields the same result. The result of this model is based on the membership function degree. In this test, the degree of membership was 1, which led to a display of 100% of the information. Notably, the font size of the experimental results is determined based on the user context shown in Table 6, which is entered via the system interface. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Candidate Hotels in** & & & & & & \\
**Cluster 2** & & & & & & & \\ \hline LOTTE City Hotel & & & & & & & \\ Myeongdong & & & & & & & \\ Hotel Prince Seoul & 285.5777 & 1060.923 & 1148.291 & 2 & 3 & 0.76584 \\ Best Western Arirang Hill & & & & & & & \\ Dongdaemun & & & & & & & \\ GRID INN & 359.6967 & 657.8149 & 308.1377 & 2 & 2 & 0.827459 \\ Hanok 24 Guesthouse & & & & & & & \\ Gyeongbokgung & & & & & & & \\ Hotel Gracery Seoul & 663.8276 & 966.0803 & 1509.317 & 2 & 4 & 0.697971 \\ Hotel Skypark Kingstown & & & & & & & \\ Dongdaemun & 1337.307 & 482.365 & 1324.931 & 2 & 4 & 0.631902 \\ Hotel The Designers & & & & & & & \\ Cheongnyangni & & & & & & & \\ Ibis Ambassador Seoul & & & & & & & \\ Myeong Dong & & & & & & & \\ Nine Tree Premier Hotel & & & & & & & \\ Myeongdong II & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Comparison of the candidate hotels of the best cluster (Cluster 2) using TOPSIS: C1, C2, and C3 represent the distances to the closest fast food restaurant, subway, and park respectively; C4 and C5 represent the cost and number of hotel stars, respectively, and CI represents the closeness index of the candidate hotels in Cluster 2. Figure 11: General system procedure for the AR visualization service. Figure 10: AR visualization using a mobile device: (**a**) user item setting, (**b**) AR parameter settings, page, and (**c**) AR parameter settings. Figure 12: Visualization via LOD Model: (**a**) real object, (**b**) information concerning the object displayed by the “LOD Model 1: Distance-based model” and “LOD Model 2: Fuzzy model” settings, and (**c**) information concerning the object displayed by the “LOD Model 3: user preference” setting. Finally, Figure 12c shows the output of executing the \"LOD Model 3\" setting. This model visualizes information based on the LOD specified by the user. In this test, the user selected an LOD of 3, which led to the visualization of three information fields in the display stage. In addition, in this experiment, the user selected a text size of 10 sp units for visualization. It should be noted that the maximum LOD differs between objects.