[閒聊] 好冷清

[bookmarks (裝誰像誰誰裝誰誰都像誰)]

感覺好冷清喔！感覺變軍旅版了，來給班板一點學術氣息吧！

2008 Workshop on Systems, Man and Cybernetics
１０／９在台北國際電子展(2008 TAITRONICS)中，
邀集五位傑出研究者於此領域的專題演講，
關於這個SMC，是指系統、人、控制理論在IEEE的分會，
系統工程其中包含了，問題的定義方法，建模，模擬，試驗系統的方法，
人因工程，資料和方法，系統設計的技巧、測試和評估的方法。
下一段懶的翻了......
Integration of the theories of communication, control, cybernetics,
stochastics, optimization, and system structure towards
the formulation of a general theory of systems.

好吧！我真的太無聊了，再提供一個跟系統還有通訊有關的專題演講，

Stability Analysis of TCP/RED Communication Algorithm
----Ljiljana Trajkovic, IEEE Fellow

97/10/8  15:00 ~ 16:30   國立台灣科技大學【國際大樓IB-202】


Abstract
The Transmission Control Protocol (TCP) with Random Early Detection (RED)
mechanism can be viewed as a feedback control system where TCP adjusts its
sending rate depending on packet loss. In this talk, we first describe
a simple second-order discrete-time model for the TCP/RED algorithm and
investigate bifurcations and chaos in a TCP/RED system with a single TCP
connection. The complex behavior observed in the system is attributed to
a class of discontinuity-induced bifurcations observed in piecewise
smooth systems.

It has been also observed that the TCP-RED system may exhibit instability
and oscillatory behavior. The stability boundary of the TCP-RED system
depends on various network parameters, making the adjustment of the RED
gateway a difficult task. Based on a fluid-flow model, we formulate
analytical conditions that describe the stable boundary of the RED gateway
depending on the number of TCP connections. The proposed model accurately
generates a stability boundary surface in a four dimensional space, which
facilitates the adjustment of parameters for stable operation of the RED
gateway. The accuracy of the analytical results has been verified using
the ns-2 network simulations.

The proposed control methods have been based on the analytical models that
rely on statistical measurements of network parameters. Hence, stability of
the TCP-RED system may be also analyzed using the detrended fluctuation
analysis (DFA) method, which has been used for detecting long-range
correlations in seemingly non-stationary noisy signals. The key indicator
emanating from DFA is known as the scaling exponent. By examining the
variations of the DFA scaling exponent when varying system parameters,
we were able to quantify the stability of the TCP-RED system in terms
of system's characteristics.
資料來源：http://www.ee.ntust.edu.tw/news08/08092301.doc

一堆不知道的技術......


好無聊。

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