http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Optical Burst Switching Network에서 TCP 성능을 고려한 Drop Policy
송주석,김래영,김현숙,김효진 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.2B
OBS 네크워크에서 contention으로 인한 burst의 drop은 TCP의 성능에 중요한 영향을 끼치는 요소이나, 기존의 drop policy에서는 이를 고려하지 않으며 TCP에 대한 연구로는 burst의 assembling이 주를 이루고 있다. 본 논문에서는 OBS 네트워크에서 TCP의 재전송 문제를 drop policy와 연계하여 TCP의 성능을 향상시키고자 한다. 본 논문에서 제안하는 drop policy는 burst의 재전송 횟수가 drop을 결정하는데 있어서 priority로 작용하는 Retransmission Count-based DP(RC-based DP)이다. RC-based DP 모델과 general DP 모델의 성능을 ns-2를 이용한 시뮬레이션을 통해 평가하며, 이 때 시간의 변화에 따른 TCP throughput, 목적지에서 수신한 최고 Sequence 번호, 패킷의 drop rate을 비교 분석한다. In OBS networks, the burst dropping due to contention significantly affects the performance of TCP, but existing drop policies have not considered this problem and researches related to TCP have been mainly studied on burst assembling. We propose the drop policy considering retransmission of TCP to improve the performance of TCP in OBS networks. The proposed drop policy is the Retransmission Count-based DP that regards retransmission count of bursts as priority when it selects dropping burst. This paper evaluates the performance of RC-based DP model and general DP model using ns-2. The metrics of performance evaluation are TCP throughput, maximum sequence number of received TCP packets and drop rate of packet as simulation time increases.
양극산화알루미늄의 형상제어와 이를 이용한 실리콘 분말 전극 지지체 효과
송주석,하종근,김유영,박동규,안인섭,안주현,조권구,Song, Ju-Seok,Ha, Jong-Keun,Kim, Yoo-Young,Park, Dong-Kyu,Ahn, In-Shup,Ahn, Jou-Hyeon,Cho, Kwon-Koo 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.4
Anodic aluminum oxide (AAO) has been widely used for the development and fabrication of nano-powder with various morphologies such as particle, wire, rod, and tube. So far, many researchers have reported about shape control and fabrication of AAO films. However, they have reported on the shape control with different diameter and length of anodic aluminum oxide mainly. We present a combined mild-hard (or hard-mild) anodization to prepare shape-controlled AAO films. Two main parameters which are combination mild-hard (or hard-mild) anodization and run-time of voltage control are applied in this work. The voltages of mild and hard anodization are respectively 40 and 80 V. Anodization was conducted on the aluminum sheet in 0.3 mole oxalic acid at $4^{\circ}C$. AAO films with morphologies of varying interpore distance, branch-shaped pore, diameter-modulated pore and long funnel-shaped pore were fabricated. Those shapes will be able to apply to fabricate novel nano-materials with potential application which is especially a support to prevent volume expansion of inserted active materials, such as metal silicon or tin powder, in lithium ion battery. The silicon powder electrode using an AAO as a support shows outstanding cycle performance as 1003 mAh/g up to 200 cycles.