星期五, 9月 30, 2005

10/1 Class

1. business model of Wi-Fi City compared to GSM operation models.
2. business model of Skype
3. Special topics on Skype, VoIP, P2P

1. ROI
3. Customer value driven
4. Blue Ocean Strategy versus Competition Strategy

星期六, 9月 24, 2005

Homework 09/24/2005

1. What kind of broadband wireless services are needed in the city you live? Why?

2. Can Wi-Fi phones compete with 3G? Can WiMAX phones compete with 3G? Why?

3. Comment on Success of Handhelds.

Reading Assignments:

1. TW4G

2. WiMAX updates

3. Softphones are not all the same.

Success of Handhelds

Treo 600
1. Formfactor (User Interface and Human factors)
2. Right targetting (email & phone)
3. User experiences (QWERT)
4. Reliability (Hardware and software, battery power)
5. user value (User satisfaction is more important than differentiation)

星期六, 9月 17, 2005

請將作業寫在自己的 Blog

請將你的作業寫在你的 blog, 然後到
Homework 1 的Comment 登錄作業blog網址就可以了.
請勿將作業直接寫在 comment

可以參考陳一德, 謝鴻儒同學Homework 1 的方式.

另外, 謝鴻儒同學的 Homework 1 網址可以直接點選,
這是很好的做法, 更有利於前往閱讀.


Homework 1 09/17/2005

1. Create a blog to host your own leanring materials and homework.
Blog spaces can be found at http://www.blogger.com
2. Comment on eBay acquires Skype.
3. Study Lecture 1. 網際網路的趨勢, including but not limited to

Firefox, RSS, Blog, Google, Skype, VoIP, P2P, All IP Network

Due 9/24 at 1:00 P.M.


Time: Saturday 13:00-16:00

Place: 中原大學社區資源中心 芳鄰成長園

Grading Policy: Participation (Presence, Challenging and Answers, Proactiveness) 50%, Homework 50%, including Midterm Paper, Final Paper

Instructor: Associate Professor Yao-Jen Chang


yjchang at cycu dot edu dot tw

Teaching Assistant: 時定樑 g9376024@cycu.edu.tw

Hear how people who have taken the course said.


Internet Business Models and Strategies, 2nd ed., Allan Afuah and Christopher Tucci, McGraw-Hill 2003. (新月圖書東華書局代理進口)


1. 張耀仁,劉永信, 電子商務系統, 高立書局, 20011月三版.

Course Outline

1. 網際網路的趨勢

Firefox, RSS, Blog, Google, Skype, VoIP, P2P, All IP Network

2. Wi-Fi, WiMAX, 2G, 3G and mobile commerce

3. business models and operations

4. brand management

5. Competitive Strategies, Differentiation, Pricing, Niche. Implementation

Entry Barrier, Ecology, Business Opportunities, Best Practices

6. marketing at a digital age

ezpeer versus Kuro

Immediate and present difference

星期二, 9月 13, 2005

IEEE 802.16 Session 39

Executive Summary of Things Leanred

* Protocols
1. 802.16e spec to be finalized in Oct. 2005. So the Session 39 I am in is the final meeting
to make last changes, if any. Every item of 16e spec was read thru one by one during the session.
2. 802.16-2004, also known as 802.16d, has obsoleted 802.16a.
3. 802.16-2004 is for fixed broadband wireless only.

* Cerification
4. Cetecom Espanol (Spain) has certified WiMAX products since July 2005. Redline, a Canada based
WiMAX vendor, has get certified with its RedMAX product line.

* reality check
5. 16e may have battery issues. This issue must be taken care of precautiously.
6. 16e will enable verious mobile scenarios up to 120km/h.
7. 16e will be backward compatible, which means it also supports 802.16-2004

* outlook
8. WiMAX phones may undermine the base of 3G. In fact, Korea calls WiMAX phones as 4G.
9. 3.4GHz-3.7GHz spectrum is occupied by CHT-Sintel satellite only. So this is not a global issue or difficult one.
DGT of Taiwan expects to resolve it very soon.

* Session visibility
10. IEEE 802.16 chair, 802.16 working group chairs all arrived in session.
This is a superb IEEE meeting full of celebrities that has ever seen in Taiwan.

* WiMAX-enabled Services
11. Deployment of WiMAX services by ISP are real, for example Sydney of Autrailia, and many cities in North America.

* Vendors
12. Gemtek (正文), CyberTAN are 2 existing 802.16 vendors located in Taiwan.
CyberTAN is the co-host of this IEEE Session, in fact. Dr. Stanly Wang of CyberTAN chaired a series of panals today.
13. Nortel focused on 802.11-based Wireless Mesh, no solution yet on WiMAX known to the market.
14. Redline is still the leading company in WiMAX. Intel has made every efforts to dominate chip markets of WiMAX.
15. Wavesat, Alvarion, Aperto, and Samsung show strong commitments on WiMAX product R&D.

* Predictions
16. The really juicy market is not the fixed broadband wireless (802.16-2004) but in-home multimedia distribution
and mobile users on the road (802.16e).
17. The WIrelessMAN-OFDMA technology will be the winning air interface for 802.16e.
18. Let's forget license exempt WiMAX. The protocal will disappear.
19. In the future, 802.11 may disappear and the function of WLAN is replaced by 802.16e.
So the broadband wireless future may be an all-IP, all-WiMAX wireless broadband world.
802.11 will eventually die because of no Quality of Service (QoS).
20. WiMAX supports email, http, VoIP, Video Conference, and even real time service and steaming services
as described by 3GPP. WiMAX does it robustly with less cost.

星期三, 9月 07, 2005

wireless mesh to rescue flood in New Orleans

University of Illinois Urbana Champaign using in-house developed wireless mesh to rescue flood in New Orleans
related blog

softphones are not the same- skype, Gizmo, & Google Talk

agreed the following insights:

" Google 指出,未來他們的 Google Talk 將會相容於 SIP
這個影響是比較大的,且用 SIP 要跨平台互通語音也比較沒問題的
且 Gizmo Project (SIP-based)也已經跟 Google Talk 簽訂協議
在未來的版本, Gizmo Project 跟 Google Talk 的用戶彼此之間可以互通 IM 及 VoIP

如此一來,其他的 SIP 廠商應該也會陸續跟進
這樣一結合, Google Talk (or SIP) 的用戶市場就會迅速擴張很多倍
這是 Skype 專屬通訊協定比較不能做到的
VoIP 若是採用標準的 SIP, 那在市場上的競爭力會比 Skype 好很多
畢竟現在 SIP 的週邊設備很多,不是 Skype 專屬的設備可以比得上的"


For enterprises as well as governments, SIP-based softphones are obviously better:
1. on-net call is free (no inferior to Skype)
2. same rate for off-net calls (again no inferior to Skype)
3. SIP softphones are open standard versus Skype is propriatary. This means SIP
integrates more user devices (USB phones, IAD phones, Wi-Fi phones, softphones) and
encourages cross-operator roaming.
4. Gizmo (SIP-based softphone) is gaining momentum in north US. TelTel (SIP-based softphone and IM) inclusive
with Seednet has landed in Taiwan as Wagaly TelTel, a commercial VoIP service by Seednet.
5. Skype lacks manageable call logging/auditting and monitoring, which are necessary by IT policies at sectors like governments and larger enterprises.
However, Skype have gained mass and shall continue to dominate consumer markets in the coming years until SIP is capable of making