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The spread of the COVID-19 virus has brought forward a global pandemic that has halted many businesses and placed restrictions on daily activities. Vaccination of residents is crucial for a small country like Qatar to contain the spread of the virus. This study will aim to investigate and report the general outlook of Qatari residents toward the vaccine, the points of hesitancies, and how the contact tracing application (Ehteraz) can play a role in promoting vaccination. A questionnaire survey was given, and respondents answered a series of background questions and questions related to vaccine hesitancy and the effectiveness of the Ehteraz application. A broad search strategy was used to identify the main contributors to willingness and hesitancy with the COVID-19 vaccination. Regression models and test-train machine learning techniques were used for analysis. The results showed that dominance analysis was effective in highlighting the main barriers and promoters in taking the vaccine and that respondent's characteristics can be used to predict vaccination attitude.

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Rapid increases in the smartphone gaming industry have made in-game usability increasingly important. However, industrial usability is still focused on performance although high performance is not necessarily a goal in actual games. Mobile gamers largely want to increase their hedonic satisfaction. So already established usability guidelines can fail in mobile gaming. Focusing on vibrations as a haptic feedback, this study analyzed the influences of intensity and length of vibrations on user perceptions based on the technology acceptance model aiming for hedonic satisfaction when mobile gaming. A smartphone game was modified to generate seven types of vibrations for a human factors experiment with 70 subjects and administered a questionnaire to measure their perceptions of the game influenced by the vibrations.The results show that including vibrations significantly increases the perceived ease of use, perceived usefulness, and cognitive concentration in the game. The stronger vibration intensity significantly improves user perceptions of the usefulness and cognitive concentration, whereas the length of vibration is not a critical factor as long as vibrations exist.