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패킷 손실원인 구분을 바탕으로 한 유무선 혼합망에서의 TCP 우호적 전송률 제어
박정규,신성환,정충교 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
Conventional TCP is not suitable for multimedia streaming applications due to its abrupt changes in the sending rate UDP has been the solution to this problem. However UDP does not respond to the network congestion and thus incurs a severe fairness problem in the network. TCP-Friendly Rate Control (TFRCC) was proposed to substitute UDP. We propose, in this paper, a modified TFRC that can be used in wire-cum-wireless environments without performance degradation under heavy transmission errors in the wireless link We used "spike" phenomenon to distinguish losses due to congestion and due to transmission errors in the wireless link.
Input Disturbance Estimation Using a General Structured Observer
Lee, Choong-Hwan,Shin, Min-Saeng,Kim, Hwan-Seong,Kim, Sang-Bong The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.12
This paper presents the characteristics of a general structured observer and presents an estimation algorithm for a system with external disturbances which are added to the input of the system. By using a disturbance model, the general structured observer can estimate the states of the system is spite of disturbances, where the system is affected from external disturbances. Also, the general structured observer can include the function of a PI observer or high gain observer by properly adjusting the observer's gain matrices. The existence condition for the observer is derived, which can be checked by the system's observability condition and the pole-zero cancellation of the system's polynomial matrix. Through a numerical example, it is verified that the proposed observer is effective estimating the system and the input disturbance.