Homework 12-22-2007

1. Compare the business models of Metropolitan Wi-Fi Networks in the world.

Model	Service provider	Charge	Mission
BAY area Network	Google,earthLink	Free by advertising	city-wide wireless service
NYCwireless	volunteer group	free	Network access can be found in places previously not available
Taipei	Wi-fly company	NT399/month	Wireless Taipei Company corporate with Gov.
Wireless Philadelphia	earthLink	$19.95/month	help all citizens, businesses, schools, and community organizations the visitor , and streamlining City services.
FON	Linksys,google,skype ebay	Free by share	Free wifi around the world

2. Read the abstracts of the full papers, and then make your comments.
Robin Kay, Developing a comprehensive metric for assessing discussion board
effectiveness, British Journal of Educational Technology, Vol 37 No5 2006. pp. 761-783

Note: You may need to stay in the IP range of CYCU to download the article.

This paper will find out a way to evaluate the discussion board. The variable are thread, location of message within thread, author (student vs. educator), subject line clarity, time of posting, response time from previous message, number of times message was read, number of words, primary purpose, message quality, difficulty level of topic, knowledge level, processing level and use of external resources. I think the hardest part is how the student find the information they want if someone had asked before. And the purpose of the discussion board should be concerned. Not only for education, but also some technology, news discussion board which may cause other variable to show up. The participants are form different career have diversity of purpose. It remains more topics for research.

Homework 12-15-2007

1. Read the abstract of the full paper, and then make your comments.
Feng Fua, Lianghuan Liua, and Long Wang. Empirical analysis of online social networks in the age of Web 2.0, Physica A: Statistical Mechanics and its Applications Volume 387, Issues 2-3, 15 January 2008, Pages 675-684


The paper abstrat-
The growing of WWW turns another name called Web2.0, new application and way of connecting people. For example, blogs and social networking site make people communicate more easier and faster. Two of the social networking sites in China will be analyzed. They will show the networks have small-world and scale-free feature. Also, the distribution of the topological distance will be studied. The correlations between degree and degree, clustering coefficient and degree, number of page views and degree ,respectively, are discussed in the paper. This paper will show blogging network have disassortative mixing pattern and SNS is the assortative. The research and analysis of online social networks will explain the self-organizing structural characteristics.

my comments-
It's interesting that blogs and social networking site are empirical analyzed. Both are online social networks in the age of Web2.0. I think blogs want to keep the the simple and easy to write down anything. People will find the blog and share to others(blogger in google). The connection is created in comments. Social networking site is creating a connection after you registering it. And it contains more functions for interaction. For example, every visitor will be saved to make more connections.



what are assortative and disassortative mixing?

Homework 12-8-2007

1. Read the abstracts of the full papers, and then make your comments.

Yao-Jen Chang, Tseng-Yun Wang, Shi-Kai Tsai, Yu-Chia Chuang, "Action Science Approach to Experimenting Nonprofit Web 2.0 Services for Employment of Individuals with Mental Impairments" 2007 International Workshop on Social Media Analysis in conjunction with ACM/IEEE Web Intelligence 2007. (EI)

The nonprofit organization has the different value of using technology. How to set up a minimum budget for them and increase the working efficiency for them is present in this paper
.

Yao-Jen Chang and Chiu-Hui Chen, "Methodology and Evaluation of Teaching Computer Programming Laboratory with Social Media," ED-Media 2007, Vancouver, Canada, June 25-29, 2007.

The fast growing of blogs turn in several presenting ways. As teaching blog, students are expected to get more convenience for learning a subject. I think that is only for the student who cares about the subject. For other students, sometime the hw copying can be serious.

HW 12/8

中原大學圖書館線上資料庫，進入拓墣產研資料庫，

1. 查詢近期WiMax 產業分析報告ㄧ篇，作成100字摘要。

WiMax is getting hot in 2008.
"Last mile" for developing countries.
3G standard listed by ITU(International Telecommunications Union)
5 kinds of access for different application-> mobility (fixed point, walking, vehicles )
fixed WiMax vs Mobile WiMax

consumer application
NB,UMPC->PDA,MP3

Modulation scheme
frequency band(3.8G 60%)

Sprint Nextel WiMax(largest under developing project)

infrastructure of the WiMax is the key to make the new page of the next generation communication


2. 簡述 Qualcomm收購Airgo與RFMD藍牙團隊的策略佈局為哪三項?

1. need the key technology of next generation
2. full communication solution for existing consumer product
3. against the giant Intel. The success of the Centrino in notebooks.

Bonus Problem:
3. 依據 WiMAX晶片業者發展現況此研究報告，目前全球主要WiMAX 晶片業者有哪幾家?

Intel
Picochip
Fujitsu
SEQUANS
Wavesat
Runcom
Beceem

Presentation

Digital Sign System for Indoor Wayfinding for the Visually Impaired
PPT

lecture note

IT Report
Forrester Research
Gartner Report

IMS (IP multimedia Subsystem)

Wi-Fi VS HSDPA

similar : handover, multimedia(<5Mbps), 3~5m, Qos
difference : physical, initial cost(infrastructure), TCO(total cost ownership)

handover(without disconnection)

Wi-Fi, contention base, no QoS, data communication

Vioce(delay must < 250ms)


presentation 1
Feedback from the auditor.

11-17-2007 Homework

Understanding mobile phone requirements for young adults with cognitive disabilities
Melissa Dawe
Pages: 179 - 186
Full text available: Pdf(251 KB)

Widespread hope for families with cognitive disabilities- Mobile phone.

it increase

• safety
• independence
  
• social connectedness

special design is needed for special people.

Observing Sara: a case study of a blind person's interactions with technology
Kristen Shinohara, Josh Tenenberg
Pages: 171 - 178
Full text available: Pdf(286 KB)

Researchers, who are interested in the assistive technology, may observe the the user firstly.
Close look of how their true life. Something the users really want to have. The user show the way they use the technology and adjust the usage of the normal people will do.


Using participatory activities with seniors to critique, build, and evaluate mobile phones
Michael Massimi, Ronald M. Baecker, Michael Wu
Pages: 155 - 162
Full text available: Pdf(2.12 MB)

When the population of the senior increased, the design of the mobile device is also important. From my knowledge, the elderly people cannot use all the function of the cell phone that design for young people. The keypad, words in screen are too small for them.

class note

CSMA

Light
-interference
-noise immunity

idle <-->collission

contention base
schedule

CSMA/CD 802.3 circuit complexity
CSMA/CA 802.11

10-20-2007 Homework

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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.