【www.shanpow.com--英语作文】
【一】:Youtube 英语学习法
Youtube 英語學習法
六大步驟的實行重點&推薦影片名單
Step 1: 每天留一段時間讓自己沐浴在英語中
英語人士主講的簡單英語課程
.podEnglish
.JenniferESL
.duncaninchina
.ActionTeacher
BBC Learning English
新聞頻道
官方網站
Step 2: [重複多聽] 自己感興趣的類別
兒童節目˙卡通
.芝麻街
.PBS
.HuluDotCom
看美食節目學[好吃的英文
.Cooking With Dog
.Food Wishes
.AboutEating.com
.Laura VitalesKitchen
解說易懂的DIY影片
.Howcast
.HouseholdHacker
.Kipkay
Step 3: 以玩遊戲的方式增進[精準]的聽力
以玩遊戲的方式練習聽寫
.smart.fm
Step 4 讓耳朵習慣[即時英文]的速度
適合初學者的簡單英語新聞
.VOA
.VOANews.com
.VOA Learning English
充滿熟悉主題的日本介紹影片
.TheJapanChannel.com .GenkiJapanNet
.國家地理頻道
.NHK WORLD Englishwww.shanpow.com_www.,YouTube.com。
能在YouTube上觀賞到的世界級課程
.邁可˙桑德爾教授[justice(正義)大課堂
.哈佛大學
.YouTube EDC
.卡內基美隆大學
.哈佛大學商學院
Step 5挑戰更高難度的內容
以聽寫的方式確認影片內容
.smart.fm
能自由切換中.英字幕的影片.TED.com
中文網站
能樂在其中的綜藝節目影片
.Current TV
.Clevver TV
.NBC
The Tonight Show
環球小姐選美大會 .The Late Show with David Letterman
.Around the World For Free 以英文報導正統新聞的影片
.ABC News
.Sky News
.ITN News
.Euronews
.AIJazeera English
.New tang Dynasty (NTD) Television .CNN的官方網站的 Video
BBC的官方網站的Video
Step6利用真正的電影，實踐線上留學新體驗
仔細觀賞紀錄片
.Current TV
.國家地理頻道 .PBS
.Design:e2
.NOVA
.Worse Than War 可免費收看的電影頻道
.Craze Digital Movies .Drelb.com頻道
.YouTube電影網頁
辯論會影片
.FORA.tv
官方網站
可在網路上實踐的留學體驗
.ACADEMIC EARTH
【二】:YouTube架构
Architecture prior to the acquisition of YouTube by Google
1. YouTube video delivery framework
2. Classifying YouTube server IP addresses
The IP addresses of front-end web servers were all mapped to .
The IP addresses of video-servers were mapped to host names of the format:
loc-v xx.loc.youtube.com (e.g., dal-v 26.dal.youtube.com)
loc is one of the 8 city codes: ash, chi, dal, lax, mia, nyc,sjc, sjl;
xx is an integer.www.shanpow.com_www.,YouTube.com。
3. Proportional load balancing of Client-to-YouTube traffic Distribution of client traffic to YouTube data centers
The fraction of tra?c received by each YouTube data center from each PoP is the same for all PoPs
The balancing strategy was not based on
network/geographic
“proximity”.
Tra?c coming from clients is distributed to 7 YouTube data centers according to ?xed proportions.www.shanpow.com_www.,YouTube.com。
4. Load balancing among 3 font-end web servers
YouTube front-ends employs the round-robin DNS resolution for mapping to the IP addresses of front-end web servers.
5. Proportional load balancing of YouTube-to-client Traffic Traffic distribution from YouTube data centers to clients
Traffic distribution from Y
ouTube data centers to various clients
The distribution of incoming video-requests to its data centers was based on the “size” or the “resources” available at those data centers.
Architecture after the acquisition of YouTube by Google
1. High level sequence of steps to retrieve content.
YouTube servers can be both present inside an ISP, or in the Google network.
Since 2009 Google has migrated most content from the YouTube original infrastructure (that was based on third party CDNs) to its own CDN. This contrasts with earlier studies such as [7], [8], according
to
which the majority of servers were located in the YouTube AS.
2. Geolocation of servers
Five datasets:
ISP Networks: EU1-ADSL, EU1-FTTH, EU2
Campus Network: US-Campus, EU1-Campus
As for a total of 33 data centers adopted in the experiment, 14 of them are in Europe, 13 in USA and 6 in other places around the world.
3. Server selection algorithm
A. Video flows and sessions
Video ?ows: long connections carrying the requested video.
Control ?ows: short connections carrying signaling messages.
Video session: an isolated video flow not preceded by any control flow Redirection: server A may not serve the content and redirect the user to another content server B.
CDF of YouTube flow size
