- A Technical Tutorial on the IEEE 802.11 Protocol
- 802.11n: MIMO-OFDM
- 802.11
- Chapter 2 of Ad Hoc Wireless Networks 2004
星期六, 4月 22, 2006
4-22-2006 Reading Assignment about WLAN 802.11
星期五, 4月 21, 2006
802.11n: MIMO-OFDM
Chapter 15: A Peek Ahead at 802.11n: MIMO-OFDM 802.11 Wireless Networks: The Definitive Guide, Second Edition (PDF)
Quadrupling Wi-Fi speeds with 802.11n (Intel)
Airgo 240 Mbps
(Faster than wired)
Field Test Results
Quadrupling Wi-Fi speeds with 802.11n (Intel)
Airgo 240 Mbps
(Faster than wired)
Field Test Results
WiMAX: Opportunity or Hype?
link
WiMAX: Opportunity or Hype?
MICHAEL RICHARDSON
University of Colorado at Boulder - General
PATRICK S. RYAN
University of Colorado at Boulder, Interdisciplinary Telecommunications Program; Catholic University of Leuven (KUL) - Interdisciplinary Center for Law and Information Technology (ICRI)
WiMAX: Opportunity or Hype?
MICHAEL RICHARDSON
University of Colorado at Boulder - General
PATRICK S. RYAN
University of Colorado at Boulder, Interdisciplinary Telecommunications Program; Catholic University of Leuven (KUL) - Interdisciplinary Center for Law and Information Technology (ICRI)
星期四, 4月 20, 2006
Is Wi-Fi Roaming Really Seamless?
read this article
Although it takes only 68 ms to switch to an AP from another,
it can disrupt applications up to 5 seconds.
Although it takes only 68 ms to switch to an AP from another,
it can disrupt applications up to 5 seconds.
UMA Follow-Up
Placing F/MC Under Enterprise Control
F/MC Watch: VoIP Fallout from CTIA
- Alternative to UMA
F/MC Watch: VoIP Fallout from CTIA
- Kyocera demos dual-mode CDMA/Wi-Fi handset with Boingo
- Boingo partners with Kineto to extend UMA service to hotspots
星期一, 4月 10, 2006
星期日, 4月 02, 2006
Homework 4-1-2006 Mobile Social Software, Part 2
Pick the assigned service from the list.
Analyze the service based on
yjchang at cycu dot edu dot tw before next time we weet in class.
參閱簡報製作原則
如何使用線上學術資源
Analyze the service based on
- technology
- what it works
- business models
- trends
yjchang at cycu dot edu dot tw before next time we weet in class.
參閱簡報製作原則
如何使用線上學術資源
星期六, 4月 01, 2006
CSMA/CA & 802.11
802.11 PCF & DCF
802.11 RTS & CTS
802.11 QoS
animations (two Applets about CSMA/CA Simulations)
http://wps.aw.com/aw_kurose_network_3/0,9212,1406346-,00.html
802.11 RTS & CTS
802.11 QoS
animations (two Applets about CSMA/CA Simulations)
http://wps.aw.com/aw_kurose_network_3/0,9212,1406346-,00.html
packet radio with Aloha
packet radio with Aloha in Lectures 13 & 14 of MIT Data Communication Networks Course
We will also cover the wireless location privacy protection as discussed in the paper by Schilit et al.
evolution of contention based protocols:
1. ALOHA
2. CSMA (Carrier Sense Multiple Access)
3. CSMA/CD (collision detection) -> IEEE 802.3 (Ethernet, 100M, 1Gbps)
We will also cover the wireless location privacy protection as discussed in the paper by Schilit et al.
evolution of contention based protocols:
1. ALOHA
2. CSMA (Carrier Sense Multiple Access)
3. CSMA/CD (collision detection) -> IEEE 802.3 (Ethernet, 100M, 1Gbps)
星期日, 3月 26, 2006
如何做好一個簡報投影片 （2023/5）
簡報的重點是人的現場表現還有你的口頭表達，投影片是輔助的性質，不是主角。
每張投影片不超過 5 個 bullet 項目
每個項目不超過 2 行, 且以 1 行為佳
抓出重點, 以簡短的文字敘述，不要造句,
每張投影片要有適合內容的標題，不應出現無標題
能用圖片, 就用圖片, 圖片效果勝過文字
項目用 bullets, 不用數字
Figure 不用 編號
然而，一份好的投影片可以幫助聽眾抓住你的表達重點。
以下是可以讓你的簡報看起來更專業的原則:
以下是可以讓你的簡報看起來更專業的原則:
每張投影片不超過 5 個 bullet 項目
每個項目不超過 2 行, 且以 1 行為佳
抓出重點, 以簡短的文字敘述，不要造句,
每張投影片要有適合內容的標題，不應出現無標題
能用圖片, 就用圖片, 圖片效果勝過文字
項目用 bullets, 不用數字
Figure 不用 編號
注意，直接把論文擷取幾個句子放進投影片就是新手才會有的行為，這從來都不是做投影片的方式．
建議簡報時盡量面對觀眾，試著不要低頭唸投影片。 這個很不容易做到，因為大多數人上台都會緊張，多練習才能慢慢適應。 面對觀眾看起來比較自然輕鬆且專業，而且人類溝通只有35％靠語言，65％靠肢體語言．所以練習面對觀眾展現你的肢體與表情，可以讓你的訊息傳達得更清楚．
星期六, 3月 25, 2006
Homework 3-25-2006
Pick a service from the list
according to your birthday.
Analyze the service based on
yjchang at cycu dot edu dot tw before next time we weet in class.
簡報製作原則
附上笑話一則
記者訪問足球教練︰
「請問您認為足球運動對體育風氣的提升有哪些貢獻？」
「絕對沒有。」教練立即回答。
「絕對沒有？」吃驚的記者問︰「為什麼？」
「足球是22 個需要休息的人在場上拼命地跑，
而四萬個需要運動的人卻坐在那裡看！」
according to your birthday.
Analyze the service based on
- technology
- what they do
- business models
- trends
yjchang at cycu dot edu dot tw before next time we weet in class.
簡報製作原則
附上笑話一則
記者訪問足球教練︰
「請問您認為足球運動對體育風氣的提升有哪些貢獻？」
「絕對沒有。」教練立即回答。
「絕對沒有？」吃驚的記者問︰「為什麼？」
「足球是22 個需要休息的人在場上拼命地跑，
而四萬個需要運動的人卻坐在那裡看！」
services about mobile social software
a partial list of services about mobile social software (reference)
ActiveMatch,
AirCQ,
awaRE,
BEDD,
Beliefnet Mobile,
BuZZone,
CrowdSurfer,
cybiko for Social Net (李信鴻)
dodgeball.com,
Encounter Bubbles,
Flickr, (蕭燦良)
Fluidtime, (林峻輝)
IcyPole, (吳善堯)
ImaHima,
Jabberwocky,
Mamjam, (廖泰成)
Meetup, (鄧富明)
MobiLuck,
mobster,
Mooble,
modus,
MTONE,
PeepsNation,
Plink Mobile,
Pocketster,
proxidating,
Proxpro, (謝春民)
Reno (Ian Smith, Social-Mobile Applications, Invisible Computing, Apr. 2005.) (林進星) (陳炯銘)
Saw-You,
Serendipity, ( 莊為竣) (張琍娟)
socialight, (許書瑜)
Socializer, (王彥傑)
Speck,
Traces of Fire,
tunA, (劉俊成)
Wavemarket, (ykk)
weemee, (陳昶豪)
WhoAt, (陳鈺夫)
WiFi.Bedouin. (田書彥)
Also,
Positioning Software
ActiveMatch,
AirCQ,
awaRE,
BEDD,
Beliefnet Mobile,
BuZZone,
CrowdSurfer,
cybiko for Social Net (李信鴻)
dodgeball.com,
Encounter Bubbles,
Flickr, (蕭燦良)
Fluidtime, (林峻輝)
IcyPole, (吳善堯)
ImaHima,
Jabberwocky,
Mamjam, (廖泰成)
Meetup, (鄧富明)
MobiLuck,
mobster,
Mooble,
modus,
MTONE,
PeepsNation,
Plink Mobile,
Pocketster,
proxidating,
Proxpro, (謝春民)
Reno (Ian Smith, Social-Mobile Applications, Invisible Computing, Apr. 2005.) (林進星) (陳炯銘)
Saw-You,
Serendipity, ( 莊為竣) (張琍娟)
socialight, (許書瑜)
Socializer, (王彥傑)
Speck,
Traces of Fire,
tunA, (劉俊成)
Wavemarket, (ykk)
weemee, (陳昶豪)
WhoAt, (陳鈺夫)
WiFi.Bedouin. (田書彥)
Also,
Positioning Software
星期四, 3月 23, 2006
4/1 Social Mobile Applications
Ian Smith, Social-Mobile Applications, Invisible Computing, Apr. 2005.
Jay Dixit, The Artful—and Mobile—Dodger, IEEE Spectrum, Mar. 2005
Social Serendipity: Mobilizing Social Software, Pervasive Computing, Apr-Ju. 2005
如何使用線上學術資源
Jay Dixit, The Artful—and Mobile—Dodger, IEEE Spectrum, Mar. 2005
Social Serendipity: Mobilizing Social Software, Pervasive Computing, Apr-Ju. 2005
如何使用線上學術資源
星期六, 3月 18, 2006
3/25 WiMAX Technology
- WiMAX technology can provide coverage in both LOS and NLOS conditions.
- NLOS has many implementation advantages that enable operators to deliver broadband data to a wide range of customers.
- WiMAX technology has many advantages that allow it to provide NLOS solutions, with essential features such as OFDM technology, adaptive modulation and error correction.
- Furthermore, WiMAX has many optional features, such as ARQ, sub-channeling, diversity, and space-time coding that will prove invaluable to operators wishing to provide quality and performance that rivals wireline technology.
- For the first time, broadband wireless operators will be able to deploy standardized equipment with the right balance of cost and performance; choosing the appropriate set of features for their particular business model.
full text
Homework 3-18-2006
WiMAX will indeed accomplish a multitude of consumer applications that will overshadow last mile communication links. Applications such as streaming video to PDA’s, cell phones, and portable PCs are one example. How about downloading music on demand to future versions of the ever-popular iPod or your favorite TV programs to your laptop while you are on a train speeding along at 75 miles per hour? The list goes on and on. Broadband will be a huge revenue engine for the providers who take heed and plan for the future. <full text>
Questions: Why are the wireless application mentioned above not doable by GPRS/3G, or Wi-Fi in terms of their specifications?
Questions: Why are the wireless application mentioned above not doable by GPRS/3G, or Wi-Fi in terms of their specifications?
VoIP Operator Case Study
Vonage
- Switch to Vonage and keep your phone number
- Vonage has area codes available across the US and in other countries
- Real time billing information anytime through your online web account
- Quick access to local emergency services with Vonage's 911 Dialing feature
星期二, 3月 14, 2006
Papers about wireless networks applications on social network services
[DOC] Some Social Implications of Ubiquitous Wireless Networks
MA Smith - research.microsoft.com
Groups of people using these tools will gain new forms of social power, ways to organize and coordinate their interactions and exchanges just in time and just in place.
Wireless Location Privacy Protection
B Schilit, J Hong, M Gruteser - www-2.cs.cmu.edu
Location-based services are emerg-
ing as the next killer app in personal
wireless devices, but there are few safe-
guards on location privacy. In fact, the
demand for improved public safety is
pushing regulation in the opposite
direction.
PeopleNet: engineering a wireless virtual social network
M Motani, V Srinivasan, PS Nuggehalli
People often seek information by asking other people even when they have access to vast reservoirs of information such as the Internet and libraries. This is because people are great sources of unique information, especially that which is location-specific, community-specific and time-specific. Social networking is effective because this type of information is often not easily available anywhere else.
The Effects of a Wireless On-Line Community Network on Social Capital
M Mc Nally, M Bannon, J Greaney, A Hickey, M Mc
Technology has been traditionally seen to be a cause of decline in
social engagement and interaction, for example increased
television viewing is associated with lower levels in Social
Capital. However, it is now believed that on-line technology
and CMC can be used to increase social capital. Technology
can achieve this by removing the barriers of time and location,
allowing communication over distance and by allowing
asynchronous interaction.
MA Smith - research.microsoft.com
Groups of people using these tools will gain new forms of social power, ways to organize and coordinate their interactions and exchanges just in time and just in place.
Wireless Location Privacy Protection
B Schilit, J Hong, M Gruteser - www-2.cs.cmu.edu
Location-based services are emerg-
ing as the next killer app in personal
wireless devices, but there are few safe-
guards on location privacy. In fact, the
demand for improved public safety is
pushing regulation in the opposite
direction.
PeopleNet: engineering a wireless virtual social network
M Motani, V Srinivasan, PS Nuggehalli
People often seek information by asking other people even when they have access to vast reservoirs of information such as the Internet and libraries. This is because people are great sources of unique information, especially that which is location-specific, community-specific and time-specific. Social networking is effective because this type of information is often not easily available anywhere else.
The Effects of a Wireless On-Line Community Network on Social Capital
M Mc Nally, M Bannon, J Greaney, A Hickey, M Mc
Technology has been traditionally seen to be a cause of decline in
social engagement and interaction, for example increased
television viewing is associated with lower levels in Social
Capital. However, it is now believed that on-line technology
and CMC can be used to increase social capital. Technology
can achieve this by removing the barriers of time and location,
allowing communication over distance and by allowing
asynchronous interaction.
Social Serendipity
星期六, 3月 11, 2006
星期日, 2月 26, 2006
802.11
802.11 Metropolitan Wireless Business Models
802.11 Protocol
Industry & Products
- Taipei Model
- Bay Area Model
- Philadelphia Model
802.11 Protocol
- 802.11b/a/g/n
- 802.11 MAC (pp. 2-88~2-107)
- 802.11 PCF & DCF
802.11 RTS & CTS
802.11 QoS - animations (two Applets about CSMA/CA Simulations)
Industry & Products
Features of Skype
1. peer to peer, no server required, therefore, no operation cost like cellular communications
2. overlay, not relying on existing Internet protocols beyond Layer 4, resilient to malfunctions of Internet services
3. scalable, using supernodes among every 500 nodes, adaptive to constant configuration changes
4. high quality codec for crystal voice
5. strong penetration to NAT and firewalls
6. free for now and maybe forever for on-net calls
7. implementation of packet voice
8. consumes reasonable bandwidth, consumes significant CPU
9 . teleconference, voice communications for 5 parties at most
10. millions people online all the times, number keep rising.
11. provide presence like messengers, great feature compared to old phones
2. overlay, not relying on existing Internet protocols beyond Layer 4, resilient to malfunctions of Internet services
3. scalable, using supernodes among every 500 nodes, adaptive to constant configuration changes
4. high quality codec for crystal voice
5. strong penetration to NAT and firewalls
6. free for now and maybe forever for on-net calls
7. implementation of packet voice
8. consumes reasonable bandwidth, consumes significant CPU
9 . teleconference, voice communications for 5 parties at most
10. millions people online all the times, number keep rising.
11. provide presence like messengers, great feature compared to old phones
星期六, 2月 25, 2006
Wireless Metropolitan Services
–遠端照護
–無障礙設施(行動導盲)
–垃圾車提示
–路邊停車
–環保稽查
–到院前照護(急救、病例、生理數據)
–民眾上網費用收入
–民眾VOIP費用收入
–婦女夜間乘車安全監控
–學童安全
–汽車、貴重物品監控
定位廣告推播費用
•學童安全
Homework 2-25-2006
停課公告: 因為外出開會, 三月四日停課一次
1. Read the article Paging (and Tracking) Dr. Wi-Fi.
Write down the abstract.
2. Propose 1~3 wireless services that can be depolyed on motropolitan wireless networks. What kind of business model is there?
如果你的作業引用他人文章, 務必註明出處或是網址, 以示尊重他人創作.
References:
1. Wireless Metropolitan Services
2. 學童安全
3. 婦女夜間乘車安全監控
4. 汽車、貴重物品監控
5. Wireless Health Care
1. Read the article Paging (and Tracking) Dr. Wi-Fi.
Write down the abstract.
2. Propose 1~3 wireless services that can be depolyed on motropolitan wireless networks. What kind of business model is there?
如果你的作業引用他人文章, 務必註明出處或是網址, 以示尊重他人創作.
References:
1. Wireless Metropolitan Services
2. 學童安全
3. 婦女夜間乘車安全監控
4. 汽車、貴重物品監控
5. Wireless Health Care
星期五, 2月 24, 2006
2-25-2006 Trend Observation
Dual Mode Handset
Wireless for health care
Voice over Wi-Fi
Location Based Services
What I saw in Seoul in Jan. 2006. Coex,
Metro
Wireless for health care
Voice over Wi-Fi
Location Based Services
What I saw in Seoul in Jan. 2006. Coex,
Metro
Dual Mode Handset
Nokia Launches Dual-Mode 6136 Flip PhoneWi-Fi Cell Phone T-Mobile Ready
1. With voice revenue slowly declining, operators are looking towards content to make up the difference.
2. They're banking on dual-mode convergence as one tool to do so.
3. The additional bandwidth of a Wi-Fi network should encourage mobile subscribers to use more data services, such as Web, e-mail, MMS, music, video, handset TV, etc."
1. With voice revenue slowly declining, operators are looking towards content to make up the difference.
2. They're banking on dual-mode convergence as one tool to do so.
3. The additional bandwidth of a Wi-Fi network should encourage mobile subscribers to use more data services, such as Web, e-mail, MMS, music, video, handset TV, etc."
星期四, 2月 23, 2006
Issues of Voice over Wi-Fi
1. 802.11 QoS
absence—until very recently—of a standards-based solution for prioritizing
2. Fast Hand-off between APs
re-authentication between APs takes time such that voice suffers.
Product Solution : "UltraThin" access points (APs) & packet-by-packet micro-management of multiple data streams means that adjacent APs are never broadcasting at the same time
segregate different types of traffic (e.g., voice and data) on different radios, completely eliminating the 'contention' issue or need to prioritize traffic
background: Wi-Fi—802.11b and 802.11g—there are only three non-overlapping channels
absence—until very recently—of a standards-based solution for prioritizing
2. Fast Hand-off between APs
re-authentication between APs takes time such that voice suffers.
Product Solution : "UltraThin" access points (APs) & packet-by-packet micro-management of multiple data streams means that adjacent APs are never broadcasting at the same time
segregate different types of traffic (e.g., voice and data) on different radios, completely eliminating the 'contention' issue or need to prioritize traffic
background: Wi-Fi—802.11b and 802.11g—there are only three non-overlapping channels
星期六, 2月 18, 2006
Homework 2-18-2006
1. Create your own blog
2. Name a city where metropolitan wireless networks are being
deployed. What are the major services in that city?
reference
Bangladesh City Unwires with Sun-Powered Mesh
tip
How to insert a link at the following comment, please use the following HTML code.
2. Name a city where metropolitan wireless networks are being
deployed. What are the major services in that city?
reference
Bangladesh City Unwires with Sun-Powered Mesh
tip
How to insert a link at the following comment, please use the following HTML code.
Design Issues of Wireless Applications
Business models
End user devices (diversified)
Infrastructure
Ecology and value chain
Killer Applications
End user devices (diversified)
Infrastructure
Ecology and value chain
Killer Applications
Create your own blog
1. 至 http://www.blogger.com 申請, 請以你的學號 (g/s開頭) 申請免費帳號。主旨欄請用以下格式 "無線通訊網路作業一"
以加速助教登錄作業成績。
2. 請將你的作業寫在你的 blog, 然後到 課程部落格
當次 Homework 的Comment 登錄你的作業blog網址就可以了.
請勿將作業直接寫在 comment
範例
3. Use Gif verification to prevent vandalism.
4. Set Locale & Time Zone
以加速助教登錄作業成績。
2. 請將你的作業寫在你的 blog, 然後到 課程部落格
當次 Homework 的Comment 登錄你的作業blog網址就可以了.
請勿將作業直接寫在 comment
範例
3. Use Gif verification to prevent vandalism.
4. Set Locale & Time Zone
Syllabus for Spring 2006
Textbook
(M) C. Siva Ram Murthy, B. S. Manoj Ad Hoc Wireless Networks: Architectures and Protocols Prentice Hall, 2004. 全華圖書代理進口
Reference
(G) Aura Ganz, Zvi Ganz, Kitti Wongthavarawat Multimedia Wireless Networks, Prentice Hall, 2004.
Behrouz Forouzan TCP/IP Protocol Suite McGraw-Hill, 全華圖書代理進口, 2003.
(F) Behrouz Forouzan (陳中和、吳秀峰翻譯) TCP/IP 協定精要 (TCP/IP Protocol Suite, 2/e) 2004
(W) Wireless Business News Updates: http://www.wifiplanet.com
使用說明
M2.1 表示 Murthy的書第2.1節
學期課程
1. Trends of Internet Applications and Business models
Peer to peer, VoIP, Wi-Fi, WiMax, M-Commerce
Reading Assignments: handout at Wireless Blog
2. Design of Wireless Applications
Location Based Services, Metropolitan Wireless Networks
3. A Perspective of Wired & Wireless Broadband Networks
802.3, ADSL, Cable Modem, T Lines, SONET, Frame Relay, ATM, FTTx,
Reading Assignments: M1.1~ M1.8, Handout to announce
5. OSI Model and TCP/IP Protocol Suite
Layers in the OSI model, TCP/IP protocol suite, addressing
Reading Assignments: M1.9~ M1.12, F2.1~F2.3, F2.5
6. Ad Hoc Wireless Networks
Issues, MAC & Routing
Reading Assignments: M5.1~M5.3, M6.1~M6.9, M7.1~M7.9
星期日, 1月 29, 2006
星期六, 1月 14, 2006
星期六, 1月 07, 2006
2 applications of WLAN and WPAN
1. 夜店搜尋引擎
Description: Use of smart handhelds ( with UWB/AGPS, LBS) to conduct location-based trait matching services with assisted instant messaging for blind dating. Especially useful for urban young singles, male and female.
Tech: UWB/ZigBee, AGPS, LBS, PDA/SmartPhone, Database, GIS, Instant Messaging
2. 派對(轟趴)配對器
Description: Use of lightweight LED, ZigBee enabled necklaces or pings to match candidate partners with pre-defined traits. Especially useful for party goers. The LED indicates the degrees of match between the two.
Tech: UWB/ZigBee, Database, multi-color LED
Description: Use of smart handhelds ( with UWB/AGPS, LBS) to conduct location-based trait matching services with assisted instant messaging for blind dating. Especially useful for urban young singles, male and female.
Tech: UWB/ZigBee, AGPS, LBS, PDA/SmartPhone, Database, GIS, Instant Messaging
2. 派對(轟趴)配對器
Description: Use of lightweight LED, ZigBee enabled necklaces or pings to match candidate partners with pre-defined traits. Especially useful for party goers. The LED indicates the degrees of match between the two.
Tech: UWB/ZigBee, Database, multi-color LED
2 Tracking methods: Dodgeball and Navizon
I did a little research between Navizon and Dodgeball regarding buddy tracking.
Dodgeball depends on teleco operators in more than 20 cities to use SMS mechanisms for distributing location messages about buddies at nearby areas.
On the other hand, Navizon is a peer-to-peer software; it works on Wi-Fi or GSM and GPS is optional.
People equipped with GPS capabilities share location data via Wi-Fi/GSM for those who don't have GPS but with Wi-Fi/GSM.
So it is more like Nepster with the only difference that location instead of MP3 is shared in P2P mode.
In Taiwan, GSM-based location is forbidden by teleco law. So even CHT is ready to go this; regulations forbid them.
What is intriguing in Navizon is that it only receives Wi-Fi/GSM's beacons (no legal issues)
and the rest of things work by itself inside the software. So no telco participation is required and in consequence no fees need to pay from the users.
The more users in P2P positioning, the more accurate the location is.
I am thinking if it can combine match services such as freinds.yam.com,
people can do unplanned blind dates based on computer assisted trait matching (by yam) and location services empowered by devices such as Navizon.
For example, someone in a pub suddenly feels lonely and desperately wants to find someone to talk to.
There are chances that the matched person (provided by yam services) is just around the corner of the pub.
It is only very naive ideas. Sense of control and security may need further elaboration to implement.
Dodgeball depends on teleco operators in more than 20 cities to use SMS mechanisms for distributing location messages about buddies at nearby areas.
On the other hand, Navizon is a peer-to-peer software; it works on Wi-Fi or GSM and GPS is optional.
People equipped with GPS capabilities share location data via Wi-Fi/GSM for those who don't have GPS but with Wi-Fi/GSM.
So it is more like Nepster with the only difference that location instead of MP3 is shared in P2P mode.
In Taiwan, GSM-based location is forbidden by teleco law. So even CHT is ready to go this; regulations forbid them.
What is intriguing in Navizon is that it only receives Wi-Fi/GSM's beacons (no legal issues)
and the rest of things work by itself inside the software. So no telco participation is required and in consequence no fees need to pay from the users.
The more users in P2P positioning, the more accurate the location is.
I am thinking if it can combine match services such as freinds.yam.com,
people can do unplanned blind dates based on computer assisted trait matching (by yam) and location services empowered by devices such as Navizon.
For example, someone in a pub suddenly feels lonely and desperately wants to find someone to talk to.
There are chances that the matched person (provided by yam services) is just around the corner of the pub.
It is only very naive ideas. Sense of control and security may need further elaboration to implement.
Friends finding friends
http://dodgeball.com/
This mobile social network service started from New York City and is available now in 22 cities.
This mobile social network service started from New York City and is available now in 22 cities.
The Buddy Tracker in Navizon
With Navizon, you can create groups and display the current location of the members of this group.
Whether you want to make sure your daughter gets to school safely or see where you friends are gathering so that you can join them, the Buddy Tracker will be the ideal companion.
More details on Navizon
星期三, 12月 14, 2005
期末報告題目
參閱以下部落格
星際小孩 http://astrokid.blogspot.com/
芳鄰成長園 http://chang212.blogspot.com/
Reflection http://www.chieftain.idv.tw/archives/category/education/
(1)
思考如何以部落格小眾媒體的特性, 提出一個具有小眾或大眾社會影響力的部落格經營提案,
這當中包含閱讀對象選定, 主題設定, 內容與架構規劃, 常態性經營, 預計達成指標值與影響力預估,
所需資源,預期的挑戰.
題目可以環繞你所參加的社團, 你的家鄉或社區, 你的分享與關心, 你的朋友, 高中同學, 電影, 音樂, 學業, 生涯,
試著以部落格創造凝聚力, 進而引起注意或發揮影響力.
(2)
實際建構此部落格, 並且提出或實際展現你的經營之道.
注意
1. 實作不限於 www.blogger.com 你可以自由挑選部落格, 但是請勿
使用廣告太多的部落格網站.
2. 請於此公佈你的成果網址.
3. 成果繳交日期: 1/17/2006
星際小孩 http://astrokid.blogspot.com/
芳鄰成長園 http://chang212.blogspot.com/
Reflection http://www.chieftain.idv.tw/archives/category/education/
(1)
思考如何以部落格小眾媒體的特性, 提出一個具有小眾或大眾社會影響力的部落格經營提案,
這當中包含閱讀對象選定, 主題設定, 內容與架構規劃, 常態性經營, 預計達成指標值與影響力預估,
所需資源,預期的挑戰.
題目可以環繞你所參加的社團, 你的家鄉或社區, 你的分享與關心, 你的朋友, 高中同學, 電影, 音樂, 學業, 生涯,
試著以部落格創造凝聚力, 進而引起注意或發揮影響力.
(2)
實際建構此部落格, 並且提出或實際展現你的經營之道.
注意
1. 實作不限於 www.blogger.com 你可以自由挑選部落格, 但是請勿
使用廣告太多的部落格網站.
2. 請於此公佈你的成果網址.
3. 成果繳交日期: 1/17/2006
12-10-2005 Homework Assignments
Reading Assignments:
The Internet Value Network (p.17~p.28, Chap 2.)
Properties of the Internet (p. 32~p.38, Chap 3.)
Impacts of the Internet on 5-CS (p.38~p.46 Chap. 3)
A Taxonomy of Business Models (Chap. 6)
The Internet Value Network (p.17~p.28, Chap 2.)
Properties of the Internet (p. 32~p.38, Chap 3.)
Impacts of the Internet on 5-CS (p.38~p.46 Chap. 3)
A Taxonomy of Business Models (Chap. 6)
星期二, 12月 13, 2005
星期六, 12月 10, 2005
12-17-2005 Internet Business Models (2)
Components of Business Models
Profit Model (How to make money)
Customer Value (why)
Scope (to whom, what to offer)
Pricing model
Internet activities
Implementation (organization, people, …)
Sustainability (competitive advantage)
Cost Structure
Case Studies
1. Software business models: Skype, Firefox
2. eLearning Business Models: CyberMBA, Credu, SCU
Topics:
The Internet Value Network (p.17~p.28, Chap 2.)
Properties of the Internet (p. 32~p.38, Chap 3.)
Impacts of the Internet on 5-CS (p.38~p.46 Chap. 3)
A Taxonomy of Business Models (Chap. 6)
Profit Model (How to make money)
Customer Value (why)
Scope (to whom, what to offer)
Pricing model
Internet activities
Implementation (organization, people, …)
Sustainability (competitive advantage)
Cost Structure
Case Studies
1. Software business models: Skype, Firefox
2. eLearning Business Models: CyberMBA, Credu, SCU
Topics:
The Internet Value Network (p.17~p.28, Chap 2.)
Properties of the Internet (p. 32~p.38, Chap 3.)
Impacts of the Internet on 5-CS (p.38~p.46 Chap. 3)
A Taxonomy of Business Models (Chap. 6)
星期六, 11月 19, 2005
11-19 Homework
1. Reading Assignments
Chap. 1~3 of Textbook (A. Afuah and C. Tucci)
2. Summary writing of Chap. 4. Briefly outline the points of this chapter in your own words.
3. Regarding wireless services, list 3 business models that you think can make money.
Chap. 1~3 of Textbook (A. Afuah and C. Tucci)
2. Summary writing of Chap. 4. Briefly outline the points of this chapter in your own words.
3. Regarding wireless services, list 3 business models that you think can make money.
星期五, 11月 18, 2005
星期一, 11月 14, 2005
Mobile commerce
Business models of Wi-Fi, Mesh, WiMAX enabled services.
Business models of mobile commerce.
Shovel
1. Test equipment
2. AP sales
3. Wi-Fi Skype phones, VoIP over wireless
4. WiMAX cellular for vocal, multimedia
Focal point: Competitive advantage, unfair advantage
Aggregator
5. Global/National Roaming
Examples: Boingo, iPass, GRIC
Focal point: fragmented markets
6. Access Service Operators (Chain stores, café, hotel, …)
NB maybe wrong target; WiMAX WiFi Handset better
Content
7. Game over Wireless
8. Content over Wireless
Business models of mobile commerce.
星期六, 11月 12, 2005
History of media evolution
Milestones
Business impact
translation issues (text needs mass translation; pictures and videos do not.)
market globalization
real time, anytime
- 唐三藏西天取經
- 古騰堡聖經
- 進口西書
- 電子郵件(Bitnet), 進口 CD
- MIME, 進口 DVD
- ftp for multimedia download (mp3, mpeg)
- Streaming video and audio, Real Networks
- BT
Business impact
translation issues (text needs mass translation; pictures and videos do not.)
market globalization
real time, anytime
星期六, 11月 05, 2005
11-05-2005 Homework
1. Name a leading USA, Japanese, and Korean VoIP operator company. List their market shares, revenues, and profits in recnt years.
2. List 3 cities that have deployed large scale Wi-Fi, Mesh, or WiMAX networks. What are the purposes, applications, user populations, respectively?
3. Reading Assignments:
Smartphones: Symbian vs. Win CE
4. 預習 11-19 課堂討論題目, 蒐集相關資料, 以及於你的Blog記下發言草稿
2. List 3 cities that have deployed large scale Wi-Fi, Mesh, or WiMAX networks. What are the purposes, applications, user populations, respectively?
3. Reading Assignments:
Smartphones: Symbian vs. Win CE
4. 預習 11-19 課堂討論題目, 蒐集相關資料, 以及於你的Blog記下發言草稿
星期六, 10月 29, 2005
IP Networks
Special topics
1. What drives wireless broadband and makes it fly? What does it mean in terms of industries and business?
2. What are the technological and business impacts and implications of emergence of digital camera, IP Phone, digital TV, & digital broadcast?
3. Why all IP networks? Please explain briefly. What does it mean in terms of industries and business?
1. What drives wireless broadband and makes it fly? What does it mean in terms of industries and business?
2. What are the technological and business impacts and implications of emergence of digital camera, IP Phone, digital TV, & digital broadcast?
3. Why all IP networks? Please explain briefly. What does it mean in terms of industries and business?
10/29 Homework
Compare 3 VoIP software- skype, Gizmo, & Google Talk
1. 如果你的作業引用他人文章, 務必註明出處或是網址, 以示尊重他人創作.
2. 引用以單句為限, 並且明確以引號標示, 切勿整段引用甚至全文引用.
3. 引用來源必須具備權威性, 建議使用學術或研究單位, 或是知名公司的資料, 不可使用報紙或一般性商業文章等二手傳播文字.
11/5 Class VoIP Business
VoIP Business
1. Business models of VoIP
2. Opportunities of Mobile VoIP
3. Automated self-service over VoIP
1. Business models of VoIP
2. Opportunities of Mobile VoIP
3. Automated self-service over VoIP
星期日, 10月 23, 2005
10/29 Class VoIP
VoIP Technology
Peer to peer
Features of Skype
Client-Server, Non SIP
Client-Server, SIP (references)
Softphones are not all the same.
CMMi
VoIP Business
1. Business models of VoIP
2. Opportunities of Mobile VoIP
3. Automated self-service over VoIP
Peer to peer
Features of Skype
Client-Server, Non SIP
Client-Server, SIP (references)
Softphones are not all the same.
CMMi
VoIP Business
1. Business models of VoIP
2. Opportunities of Mobile VoIP
3. Automated self-service over VoIP
10/22 Homework
1. List 10 applications of WiMAX
2. Compare WiMAX 802.16e versus 3G and 4G.
References:
Broadband wireless applications
WiMAX protocols
2. Compare WiMAX 802.16e versus 3G and 4G.
References:
Broadband wireless applications
WiMAX protocols
星期六, 10月 22, 2005
星期六, 10月 15, 2005
Homework 10/15
1 Take a look at the bird flu news report and the following labs.
i. Get the most from Google-1
ii. Get the most from Google-2
Then do a literature survey on the net about bird flu. Try to answer the question as described in
Get the most from Google-3
Hint: Please write on your own blog and post the link in the comment below.
2. Reading assignments: prepare yourself for 10/22 class. We will discuss the subjects next week.
10/22: WiMAX
WiMAX Business
1. WiMAX 802.16e is not substitute of 3G.
3G spans from physical layer to applications while 802.16e is MAC.
2. WiMAX is part of a bigger infrastructure.
Still needs networking and transport control to support applications.
3. WiMAX highlights state of the art of computer networking while 3G and beyond is state of the art of telecommunications.
4. WiMAX points a new direction of cost down and quality of service. Maybe it is time of paradigm shift from telecom (3G and B3G) to computer networking (IEEE802). Remember 802.16 is basically non contention-based while 802.3 and 802.11 are all contention-based.
1. WiMAX 802.16e is not substitute of 3G.
3G spans from physical layer to applications while 802.16e is MAC.
2. WiMAX is part of a bigger infrastructure.
Still needs networking and transport control to support applications.
3. WiMAX highlights state of the art of computer networking while 3G and beyond is state of the art of telecommunications.
4. WiMAX points a new direction of cost down and quality of service. Maybe it is time of paradigm shift from telecom (3G and B3G) to computer networking (IEEE802). Remember 802.16 is basically non contention-based while 802.3 and 802.11 are all contention-based.
10/15 class
大未必是美, 小兵能立大功
今日世界, 計畫常跟不上變化, 培養實力加上速度, 發揮勇氣與溫柔的力量, 成就大事業, 有為者亦若是
做十件不成功的事, 不如只做一件成功的事
沒有效益的事, 何必去做.
在做中學是真學習
真功夫, 真本事, 切勿追求表面或只重形式
精益求精, 虛心接納, 止於至善
善用知識, 洞見細微, 講究自律, 重視細節
個人修練
今日世界, 計畫常跟不上變化, 培養實力加上速度, 發揮勇氣與溫柔的力量, 成就大事業, 有為者亦若是
做十件不成功的事, 不如只做一件成功的事
沒有效益的事, 何必去做.
在做中學是真學習
真功夫, 真本事, 切勿追求表面或只重形式
精益求精, 虛心接納, 止於至善
善用知識, 洞見細微, 講究自律, 重視細節
個人修練
星期五, 9月 30, 2005
10/1 Class
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.
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)
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.
http://minstral.blogspot.com/2005_02_01_minstral_archive.html
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.
http://minstral.blogspot.com/2005_02_01_minstral_archive.html
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.
Syllabus
Time: Saturday 13:00-16:00
3. business models and operations
4. brand management
5. Competitive Strategies, Differentiation, Pricing, Niche. Implementation
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
Email:
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.
Textbook
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)
Reference
1. 張耀仁，劉永信, 電子商務系統, 高立書局, 2001年1月三版.
Course Outline
1. 網際網路的趨勢
Firefox, RSS, Blog, Google, Skype, VoIP, P2P, All IP Network
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
星期三, 9月 14, 2005
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.
* 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"
source:
http://blog.yam.com/candyz/archives/439526.html
comments:
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
" 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"
source:
http://blog.yam.com/candyz/archives/439526.html
comments:
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
星期三, 8月 24, 2005
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