HW

1. Read and then comment on the following papers.

• Yao-Jen Chang, Shih-Kai Tsai, Tsen-Yung Wang Wayfinding Systems Based on Passive RFID for Individuals with Cognitive Impairments
• RFID is the key guild in the application for trigger the wayfinding system. It also describe how the model acts by using RDFS. The detail scenario can be expressed.
  
  
• Yao-Jen Chang, Tseng-Yun Wang, Yu-Chia Chuang, Shih-Kai Tsai, “Ontology-based Personalized Wayfinding System Using Deviation Detecting for Individuals with Cognitive Impairments” to be presented in International Conference on Convergence Information Technology 2007, Gyeongju, Korea. November 21~23, 2007. (EI)
• Deviation detecting issue is addressed in this paper. The users are facing the possibilities of lost on the way to their destination. The algorithm can solve the problem based on breadth-first traversal.
  

(以上論文都收錄在講義裡)

2. Read Sec. 1-3-6 of Textbook.
What is the disadvantage of Mobile IP and what's the solution?
Routing inefficiencies->triangular routing
Security issues->using firewall

3. According to lecture notes on Page 2, what is social network? Why is the positioning a major factor in mobile social network service?
People tie together by network with special reasons and effect each other. By knowing the position, the social network can start and get more close to real person.

Homework 9/15/2007

1. Translate or rewrite the abstract of the following papers.

• Wayfinding Systems Based on Geo-coded QR Codes and Social Computing for Individuals with Cognitive Impairment, (accepted as a Journal paper.), to be presented in International Conference on Convergence Information Technology 2007, Gyeongju, Korea. November 21~23, 2007. (EI)
  
  A new and novel wayfinding system that helps the individuals with cognitive impairment. QR-Code base technology can easily used in indoor by using wi-fi as a data transmission media. User takes the QR-Code and will pop out a navigation picture to assist or remind in right way to turn or go straight. In addition, the tracking system will monitor the user in case of lost on the way to the destination. The blog as a training and teaching tool to help the individuals with cognitive impairment to get familiar with the technology.
  
  
• A General Architecture of Mobile Social Network Services, to be presented in International Conference on Convergence Information Technology 2007, Gyeongju, Korea. November 21~23, 2007. (EI)
  
  A novel MSNs is introduced in this paper. The location-ware service can be have several great personalize applications, such as blind dates, looking for friends. People won't be isolated by using new Internet technology, but as a social tools to get more closed and form a community. Profile matching can get professions together with same interest. The architecture with social service is constructed in existing Wi-Fi technology.
  

2. Read Sec. 1-1, 1-2 of Textbook and the presentation materials in class.
What is the key factor which contributes to the integration of various media such as data, voice, and video on a single platform?

Everything is through IP(Internet protocol, so that data, voice and video can exchange information quickly.

3. What are the major differences between wireless and wired communication?
From the slides, we can find multipath, fading , interference and hidden terminal are the key differences.