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382 results on '"Yang, Zijun"'

3. Research on Load Distribution Method of Cascade Hydropower Station with Maximum Energy Storage at the End of Dispatching Period

Author

Li, Tianqing, Lu, Peng, Zhou, Pengcheng, Han, Bing, Yang, Zijun, Yang, Kaibin, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Lu, Xinzheng, Series Editor, Zheng, Sheng’an, editor, Taylor, Richard M., editor, Wu, Wenhao, editor, Nilsen, Bjorn, editor, and Zhao, Gensheng, editor

Published
2025
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37. Virome in the cloaca of wild and breeding birds revealed a diversity of significant viruses

Author

Shan, Tongling, Yang, Shixing, Wang, Haoning, Wang, Hao, Zhang, Ju, Gong, Ga, Xiao, Yuqing, Yang, Jie, Wang, Xiaolong, Lu, Juan, Zhao, Min, Yang, Zijun, Lu, Xiang, Dai, Ziyuan, He, Yumin, Chen, Xu, Zhou, Rui, Yao, Yuxin, Kong, Ning, Zeng, Jian, Ullah, Kalim, Wang, Xiaochun, Shen, Quan, Deng, Xutao, Zhang, Jianmin, Delwart, Eric, Tong, Guangzhi, and Zhang, Wen

Published
2022
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39. Software defined network inference with evolutionary optimal observation matrices

Author

Malboubi, Mehdi, Gong, Yanlei, Yang, Zijun, Wang, Xiong, Chuah, Chen-Nee, and Sharma, Puneet

Subjects
Data Management and Data Science, Information and Computing Sciences, Engineering, Bioengineering, Passive and active network measurement, Network inference, Matrix completion, Software defined networking, Technology, Networking & Telecommunications, Information and computing sciences
Abstract

A key requirement for network management is the accurate and reliable monitoring of relevant network characteristics. In today's large-scale networks, this is a challenging task due to the scarcity of network measurement resources and the hard constraints that this imposes. This paper proposes a new framework, called SNIPER, which leverages the flexibility provided by Software-Defined Networking (SDN) to design the optimal observation or measurement matrix that can lead to the best achievable estimation accuracy using Matrix Completion (MC) techniques. To cope with the complexity of designing large-scale optimal observation matrices, we use the Evolutionary Optimization Algorithms (EOA) which directly target the ultimate estimation accuracy as the optimization objective function. We evaluate the performance of SNIPER using both synthetic and real network measurement traces from different network topologies and by considering two main applications for per-flow size and delay estimations. Our results show that SNIPER can be applied to a variety of network performance measurements under hard resource constraints. For example, by measuring only 8.8% of all per-flow path delays in Harvard network [1], congested paths can be detected with probability of 0.94. To demonstrate the feasibility of our framework, we also have implemented a prototype of SNIPER in Mininet.

Published
2017

47. Heteroatom Lewis acid zeolites: synthesis, characterization and application in the conversion of biomass-derived oxygenates.

Author

Yang, Zijun, Ge, Qingfeng, and Zhu, Xinli

Subjects
*LEWIS acids, *BRONSTED acids, *ZEOLITES, *CHEMICAL synthesis, *ACID derivatives, *HYDROTHERMAL synthesis
Abstract

Heteroatom (such as Ti, Sn, Zr, and Hf) zeolites that contain Lewis acid site (LAS) centers with tetrahedral coordination confined in micropores with various topologies are able to catalyze reactions distinct from those catalyzed by Brønsted acid sites (BASs). In particular, these LAS centers are able to coordinate with two oxygen atoms of one or two oxygenated molecules on a single LAS simultaneously, which are suitable for the conversion of biomass-derived oxygenates via unique reaction pathways, and have been widely explored in the conversion of biomass-derived oxygenates to value-added products. In this review, methods of conventional hydrothermal synthesis, improved direct synthesis (such as interzeolite transformation and dry gel conversion) and post-synthesis (such as solid-state ion change, structural reconstruction and grafting) are compared. Next, approaches for the qualification and quantification of the location (framework or extra-framework), fine structure (closed or open), and acidity of heteroatom centers are summarized. Thereafter, we present the applications of Lewis acid zeolites in the conversion of platform oxygenates of hexoses, furan derivatives and acid derivatives via reactions of isomerization, Meerwein–Ponndorf–Verley reduction, oxidation, and ketonization. Notably, the integration of multiple steps into a one-pot cascade reaction for the conversion of oxygenates (for example, glucose to 5-hydroxymethylfurfural and furfural to γ-valerolactone) mediated by the synergy of LASs and BASs or metal sites is also discussed. Finally, the opportunities and challenges in the low-cost synthesis and large-scale application of Lewis acid zeolites for the green and sustainable synthesis of chemicals are proposed. [ABSTRACT FROM AUTHOR]

Published
2024
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