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TCP-PPCC: Online-Learning Proximal Policy for Congestion Control
Shiwei Wang,Jing Li,Yuyao Guan,Pengpeng Ding 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Effective network congestion control strategies are the key to secure the normal operation of complex and changeable networks. The fundamental assumptions of many existing TCP congestion control variants dominated by hand-crafted heuristic algorithms are no longer valid. We propose an algorithm called TCP-Proximal Policy Congestion Control (TCP-PPCC), which is based on deep reinforcement learning algorithm Proximal Policy Optimization (PPO). TCP-PPCC updates the policy offline from the features of the preceding network state and feedback from the current network environment and adjusts the congestion window online with the updated policy. The senders with TCP-PPCC can learn about the changes in network bandwidth more accurately and adjust the congestion window in time. We demonstrate the performance of TCP-PPCC by comparing it with the traditional congestion control algorithm NewReno in four network scenarios with the ns-3 simulator. The results show that in scenario 2, TCPPPCC takes 58.75% improvement in average delay and 27.80% improvement in throughput compared with NewReno.
An Improved Centroid Localization algorithm for WSN
Li ShiWei,Ding Mingli,Zhao YongPing 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.6
In wireless sensor networks (WSN) research area, node localization is one of the most important techniques. An improved Centroid localization algorithm is analyzed and an improved Centroid algorithm with selective anchor node localization algorithm (CSA) for WSN will proposed in this paper. The key point of the algorithm is the most discrepant estimation nodes are selected by the nearest reference anchor node around a distance unknown node. The triangle centroid and the polygon centroid are employed to calculate the coordinates of the estimation nodes to improve node locating precision. MATLAB simulation illustrate that the algorithm is valid and feasible.
Chunping Li,Shiwei Wang,Cuifang Zhang,Junjie Ding,Bin Ma,Rabigul Yasin,Zezheng Xue 한국원예학회 2020 원예과학기술지 Vol.38 No.3
Nitrogen is a critical determinant of forest growth and productivity, and root respiration rate and nonstructural carbohydrates are important parameters for evaluating the effects of supplied nutrients. Here, we assessed the effects of nitrogen on walnut seedlings (Juglans regia Linn.) that grew consistently for a year under favorable conditions. Seedlings were potted in seven concentrations of N availability, 0, 1, 2, 4, 8, 12, and 16 mmol·L1, and the specific root respiration rate and nonstructural carbohydrate content of the root system were determined via the offbody root system and the ketone color ratio methods, respectively. Nitrogen concentration was positively correlated with specific root respiration, and root diameter was the main factor related to specific root respiration and nonstructural carbohydrate content of walnut seedlings. Under the same nitrogen concentrations, the soluble total sugar and starch content of roots increased with increasing root diameter, while the specific root respiration increased with decreasing root diameter. Compared to the 0 mmol·L1 nitrogen concentration, the content of nonstructural carbohydrates in the root system and the specific root respiration were higher when nitrogen concentration was N16. Our comprehensive analysis showed that a nitrogen concentration of N16 improved the respiration rate of the seedling root system, significantly increased the content of nonstructural carbohydrates in the seedling root system, and effectively promoted the growth and development of the seedling root system of walnut seedlings.
Design of Concentrating System for Solar Side-pumped Slab Laser
Wentong Fan,Yan Liu,Pan Guo,Rui Deng,Nan Li,Fukang Ding,Yasha Li,Jun Zhou,Shiwei Xie 한국광학회 2020 Current Optics and Photonics Vol.4 No.1
The design of a concentration system for a solar side-pumped slab laser was investigated. The side size of the slab laser medium is 2 mm × 20 mm. Based on the principle of the edge ray, a secondary concentrating system consisting of a rectangular parabolic mirror (RPM) and a rectangular dielectric-filled compound parabolic concentrator (RDCPC) was demonstrated. The focal length of RPM is 1200 mm and the size is 734 mm × 2000 mm. The outlet size of the RDCPC is 2 mm × 20 mm. The concentration effect was analyzed by using Tracepro optical software. The results showed that the concentration efficiency reached 81.3% and the uniformity of the spot was 91.4% after optimization. This design of concentration system is of great reference value for a solar side-pumped slab laser.
Design of Concentrating System for Solar Side-pumped Slab Laser
Fan, Wentong,Liu, Yan,Guo, Pan,Deng, Rui,Li, Nan,Ding, Fukang,Li, Yasha,Zhou, Jun,Xie, Shiwei Optical Society of Korea 2020 Current Optics and Photonics Vol.4 No.1
The design of a concentration system for a solar side-pumped slab laser was investigated. The side size of the slab laser medium is 2 mm × 20 mm. Based on the principle of the edge ray, a secondary concentrating system consisting of a rectangular parabolic mirror (RPM) and a rectangular dielectric-filled compound parabolic concentrator (RDCPC) was demonstrated. The focal length of RPM is 1200 mm and the size is 734 mm × 2000 mm. The outlet size of the RDCPC is 2 mm × 20 mm. The concentration effect was analyzed by using Tracepro optical software. The results showed that the concentration efficiency reached 81.3% and the uniformity of the spot was 91.4% after optimization. This design of concentration system is of great reference value for a solar side-pumped slab laser.