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Your search keyword '"Luo, Zhifeng"' showing total 296 results
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296 results on '"Luo, Zhifeng"'

9. Implantation underneath the abdominal anterior rectus sheath enables effective and functional engraftment of stem-cell-derived islets

Author

Liang, Zhen, Sun, Dong, Lu, Shuaiyao, Lei, Zhengjun, Wang, Shusen, Luo, Zhifeng, Zhan, Jinqin, Wu, Shuangshuang, Jiang, Yong, Lu, Zhi, Sun, Shicheng, Shi, Yingying, Long, Haiting, Wei, Yanling, Yu, Wenhai, Wang, Zhihui, Yi, Liew Soon, Zhang, Yun, Sun, Wenyong, Fang, Xiaofeng, Li, Yanyan, Lu, Sufang, Lv, Jiayun, Sui, Weiguo, Shen, Zhongyang, Peng, Xiaozhong, Du, Yuanyuan, and Deng, Hongkui

Published
2023
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29. Fabrication of nanofiber yarns via electro-blown and hang-fiber process.

Author

Zeng, Jun, Chen, Ying, Xu, Guojie, Shi, Zhuohao, Luo, Zhifeng, Liu, Fengbin, Chen, Xiaojie, Zou, Zebiao, Wang, Han, and Du, Zhiyun

Subjects
YARN, POLYVINYLIDENE fluoride, POLYMER solutions, SCANNING electron microscopy
Abstract

Continuous nanofiber yarns were prepared using the electro-blown and hanging yarn process. Unlike typical electrospinning devices, this method uniquely controls the spinning process to induce the hanging phenomenon, and the resulting hanging yarn is twisted to form nanofiber yarns. A polyvinylidene fluoride nanofiber yarn was successfully prepared using the electro-blown and hanging yarn process. Scanning electron microscopy observations confirmed that the nanofibers prepared by this method exhibited good orientation within the yarn. The results indicate that the conductivity of the polymer solution and the applied voltage are crucial for inducing the hanging yarn process, ensuring stable continuous spinning. A possible mechanism is proposed, suggesting that adjusting the solution's conductivity and controlling the spinning voltage can utilize defects in the yarn-hanging process during spinning to prepare nanofiber yarns. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Relay-Assisted Partial Packet Recovery with IDMA Method in CDMA Wireless Network

Author

Luo, Zhifeng, Han, Zhu, Wong, Albert Kai-sun, and Qiu, Shuisheng

Subjects
Computer Science - Information Theory
Abstract

Automatic Repeat Request (ARQ) is an effective technique for reliable transmission of packets in wireless networks. In ARQ, however, only a few erroneous bits in a packet will cause the entire packet to be discarded at the receiver. In this case, it's wasteful to retransmit the correct bit in the received packet. The partial packet recovery only retransmits the unreliable decoded bits in order to increase the throughput of network. In addition, the cooperative transmission based on Interleave-division multiple-access (IDMA) can obtain diversity gains with multiple relays with different locations for multiple sources simultaneously. By exploring the diversity from the channel between relay and destination, we propose a relay-assisted partial packet recovery in CDMA wireless network to improve the performance of throughput. In the proposed scheme, asynchronous IDMA iterative chip-by-chip multiuser detection is utilized as a method of multiple partial recovery, which can be a complementarity in a current CDMA network. The confidence values' concept is applied to detect unreliable decoded bits. According to the result of unreliable decoded bits' position, we use a recursive algorithm based on cost evaluation to decide a feedback strategy. Then the feedback request with minimum cost can be obtained. The simulation results show that the performance of throughput can be significantly improved with our scheme, compared with traditional ARQ scheme. The upper bound with our scheme is provided in our simulation. Moreover, we show how relays' location affects the performance.

Published
2010

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