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CHAPTER 1. INTRODUCTION 1 CHAPTER 2. LITERATURE REVIEW 4 A. Wireless technology 4 1. The overview of wireless application technology 4 2. Research on cellular phone technology 8 3. Identification of problems of current wireless technology for a user's need 9 B . The elements of human interface design 1. The importance of experience and emotion design in human interface design 1. Scenario -based design 2. Navigating sequences1V 3. Screen design using graphic design element 3-l. Screen layout 3-2. Icon &image 68 3-3. Color 70 3-4. Typography 3-5. Navigation cues 73 3-6. Usability test CHAPTER 4. PROTOTYPE OF NATURAL INTERFACE DESIGN TO CONTROL THE HOME APPLIANCES A. Overall of design B. Final prototype on screen CHAPTER 5. RESULTS AND ANALYSIS OF USABILITY TEST A. Analysis of tasks 1. Result and analysis of taskl 2. Result and analysis of task2 3. Result and analysis of task3 4. Result and analysis of task4 5. Result and analysis of tasks B. User preference C. User survey D. Conclusion CHAPTER 6. CONCLUSION