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A Dynamic Offset and Delay Differential Assembly Method for OBS Network
Sui Zhicheng,Xiao Shilin,Zeng Qingji The Korea Institute of Information and Commucation 2006 Journal of communications and networks Vol.8 No.2
We study the dynamic burst assembly based on traffic prediction and offset and delay differentiation in optical burst switching network. To improve existing burst assembly mechanism and build an adaptive flexible optical burst switching network, an approach called quality of service (QoS) based adaptive dynamic assembly (QADA) is proposed in this paper. QADA method takes into account current arrival traffic in prediction time adequately and performs adaptive dynamic assembly in limited burst assembly time (BAT) range. By the simulation of burst length error, the QADA method is proved better than the existing method and can achieve the small enough predictive error for real scenarios. Then the different dynamic ranges of BAT for four traffic classes are introduced to make delay differentiation. According to the limitation of BAT range, the burst assembly is classified into one-dimension limit and two-dimension limit. We draw a comparison between one-dimension and two-dimension limit with different prediction time under QoS based offset time and find that the one-dimensional approach offers better network performance, while the two-dimensional approach provides strict inter-class differentiation. Furthermore, the final simulation results in our network condition show that QADA can execute adaptive flexible burst assembly with dynamic BAT and achieve a latency reduction, delay fairness, and offset time QoS guarantee for different traffic classes.
Comparison Study of Long-haul 100-Gb/s DDO-OFDM and CO-OFDM WDM Systems
Ling Liu,Shilin Xiao,Meihua Bi,Lu Zhang 한국광학회 2016 Current Optics and Photonics Vol.20 No.5
In this paper, for the first time, the transmission performances of long-haul 100-Gb/s direct detectionoptical OFDM (DDO-OFDM) and coherent optical OFDM (CO-OFDM) wavelength division multiplexing(WDM) systems are compared by simulation. It provides specific guides for system parameter selectionto get a high-performance and cost-effective OFDM WDM system. Specifically, the comparison involvesthree aspects: launched power is investigated to achieve better system performance; laser linewidth isnumerically investigated to choose cost-effective laser; system dispersion tolerances with different laserlinewidths are analyzed to further reveal the advantages and disadvantages of these two detecting methods,direct detection and coherent detection, in long-haul OFDM WDM system.
Zengcheng Yu,Yuqin Xiao,Huafeng Tian,Shilin Liu,Jian Zeng,Xiaogang Luo 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
Using agricultural wastes (bagasse) and polyol derived from soy oil as raw materials to develop biodegradable rigid polyurethane foams (RPUFs) is beneficial to reduce the dependence on petroleum resources and promote the sustainable socioeconomic and environmental development. This study focuses on bagasse as a functional filler to improve and control the mechanical properties and biodegradability of the RPUFs. With the increasing levels of bagasse content, the density and mechanical properties of RPUFs increase. The biodegradation of RPUFs has a greater enhancement compared to the foam without bagasse, and all bio-foams have excellent thermal insulation properties. All changes in foam performance are due to the fact that the active hydroxyl groups on bagasse react with excess isocyanate to form urethane, which affects the structure of RPUFs. In this study, scientific design and molecular regulation theory were applied to improve the utilization value of bagasse and develop high-performance biodegradable RPUFs for thermal insulation materials
Multi-granularity Switching Structure Based on Lambda-Group Model
YiYun Wang,Qingji Zeng,Chun Jiang,ShiLin Xiao,Lihua Lu 한국전자통신연구원 2006 ETRI Journal Vol.28 No.1
We present an intelligent optical switching structure based on our lambda-group model along with a working scheme that can provide a distinctive approach for dividing complicated traffic into specific tunnels for better optical performance and grooming efficiency. Both the results and figures from our experiments show that the particular channel partition not only helps in reducing ports significantly, but also improves the average signal-to-noise ratio of the wavelength channel and the blocking performance for dynamic connection requests.