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論文寫作指引

· 3 min read

Review: Global Dynamic Home Agent Discovery on Mobile IPv6 Q1. 訊息流程一不一樣? Ay: -> 原不需用 RR An: -> 模擬該重做

外: Paper 檢查注意:

  • 規格: A4, 上下 30mm, 左右 20mm, 中間 8mm, 左右對齊。字高 10pt.* 圖片引用次序 * 參考引用次序 內: Problem solving:
  1. Setup sample space2. Define probability law3. Identify event of interest4. Calculate... 原則:
  • 先討論做某件事的老方法,

  • 再和新解決方法建立關聯.

  • 提案前先確定它有效,成功 提綱:

  • 要有完整的 survey, 也就是完整的 view

  • 針對某些很明確的問題來想出正確可靠的解決辦法,細節要想透及交待清楚

    1.  想解決什麼樣的問題

    2. 清楚地告訴大家有人是如何解決 3. 想解決問題的完整步驟是什麼 * 完整解決問題的方法及步驟 http://www.icce.org/authors_page/Summary%20Guide.htm

  1. Outline: An author's contribution is of value to the reader only if the information is presented in a clear and well-organized way. Papers and summaries that follow an outline similar to that below are likely to provide readers with the best information as to their value.
  2. Introduction. This section should provide the motivation for the paper. Why is this an interesting and important topic to which the reader should allocate time and effort? How does it differ from prior art? A brief description of the research and development process, and the results, should follow.
  3. Review and overview. The author should describe the present state of knowledge and, if appropriate, provide references. This should lead to an overview of the new direction taken.
  4. Development method/procedures. The methods and reasons for the design choices should be described in sufficient detail for readers to be able to judge the validity, reliability and general applicability of the results.
  5. Results. Important results should be well summarized. More complete experimental results are expected in a paper than space allows in a summary. The results should be directly related to the topics presented in the introduction and in the overview of the new direction taken.
  6. Conclusion. The final section should highlight the author's contribution. That is, what do we now know that we did not know before this paper was presented? It should also mention limitations of the work and provide suggestions for future improvement in this area.
  7. References. A good paper lists references that support key statements and assumptions.

NS2 無線模擬結果 Trace 檔分析

· 3 min read

新 r 33.908773621 3 MAC --- 334 mipv6_bu 70 [13a 1 4 800] ------- [4196353:0 0:0 32 4198400] 舊 s -t 1.000075000 -Hs 22 -Hd 2147483647 -Ni 22 -Nx 100.00 -Ny 2200.00 -Nz 0.00 -Ne -1.000000 -Nl MAC -Nw --- -Ma 0 -Md ffffffff -Ms 14 -Mt 800 -Is 4222977.0 -Id 2147483647.0 -It ipv6_sol -Il 100 -If 0 -Ii 1 -Iv 255

欄位: event type 事件類型)

有四種基本事件類型

  • s: send (傳送)
  • r: receive (接收)
  • d:drop(丟棄)
  • f: forward (轉送)

還有一種特別類型

  • m: move (移動)

欄位 2: general flag

-t: time (時間)

欄位 3: Next hop info (下一站的資訊)

-Hs: id for this node -Hd: id for next hop towards the destination

欄位 4: Node property type tag (節點屬性類型標籤

-Ni: node id (節點 ID) -Nx –Ny -Nz: node s x/y/z coordinate (節點 x/y/z 的座標位置) -Ne: node energy level -Nl: trace level, such as AGT, RTR, MAC -Nw: reason for the event (事件發生原因)

欄位 5: packet info at MAC level (封包在 Mac 層的資訊)

-Ma: duration -Md: dest’s ethernet address -Ms: src’s ethernet address -Mt: ethernet type

欄位 6: Packet information at IP level (封包在 IP 層的資訊)

-Is: source address. Source port number (來源位置,a.b 其中 a 為節點 ID, b 為埠號 -Id: dest address.dest port number (目的位置) -It: packet type (封包類型) -Il: packet size (封包大小) -If: flow id (資料流 ID) -Ii: unique id (唯一的 ID 編號) -Iv: ttl value (Time To Live 的值)

欄位 7: 封包在應用層的資訊。

包含的應用程式類型如 arp, tcp 或者是 adhoc 路由協定,這個欄位都是以 P 所開頭的, 且標籤為隨著應用程式不同而不同

Trace 檔分析:

Packet Loss 數量計算: 不考慮 Out-of-Order 情況時,Packet Loss 數量的計算方法最簡單,每一個封包在傳送端發送前,傳送端都會給封包一個序號,序號是連續性的,因此若是在接收到發現序號有不連續的發生,則可視為有封包的移失。

OWD&IPDV 計算: 最重要的欄位是 Sending Time (傳送時間) 和 Sequence Number (封包序號), 可以用來計算出 One Way Delay (OWD) 和 IP Delay Variance (IPDV,或是 Jitter)。

One Way Delay = 接收時間 – 傳送時間

IPDV = | 目前量測到的 OWD - 上一次量測到的 OWD|

Reference:

http://140.116.72.80/~smallko/ns2/wireless1.htm http://www.k-lug.org/~griswold/NS2/ns2-trace-formats.html http://www.ee.surrey.ac.uk/Personal/L.Wood/ns/

9th. day of porting INET6 第九天

· One min read

17th Part:

檔案管理方式決定: 用 freemind 畫好了 INET6 與 INET 檔案分佈圖, 隨時比較兩者間相應模組與進度

封包測試方式決定: 使用 tictoc scenario 先測試 IPv6, ICMPv6 封包格式的正確性

Module Functions

· One min read

The Mobility module provides a geographical position of the host and handles its movement.

The Blackboard module is used for cross layer communication. It provides information relevant to more than one layer like the actual energy status of the host, the display appearance or the status of the radio.

When less is more

· One min read

就好像 Unix Programming guide 講的,unix 程式設計的哲學就是ㄧ件工具能將ㄧ件事做的最好,然後再將各種工具 "串接"(pipe) 起來共同完成一項工作.

在實體世界中,這種 "簡約"(Simplicity) 的思考,體現在 "ipod" 等商品熱賣上. 人們將會擁有一堆能將單一工作做的最好的工具.

使各種工具ㄧ起完成工作,工具之間的溝通當然是透過網路. 而擔任如 perl 或 python 在作業中 "膠合劑"(glue) 的腳色的會是我在ㄧ篇論文裡提出的個人化內容分散式網路的概念 (Personal Content Distribution Internetwork)

"Ubiquitous Computing"