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788 results on '"Lu, Teng"'

1. Two Classes of Optimal Multi-Input Structures for Node Computations in Message Passing Algorithms

Author

Lu, Teng, He, Xuan, and Tang, Xiaohu

Subjects
Computer Science - Information Theory
Abstract

In this paper, we delve into the computations performed at a node within a message-passing algorithm. We investigate low complexity/latency multi-input structures that can be adopted by the node for computing outgoing messages y = (y1, y2, . . . , yn) from incoming messages x = (x1, x2, . . . , xn), where each yj , j = 1, 2, . . . , n is computed via a multi-way tree with leaves x excluding xj . Specifically, we propose two classes of structures for different scenarios. For the scenario where complexity has a higher priority than latency, the star-tree-based structures are proposed. The complexity-optimal ones (as well as their lowest latency) of such structures are obtained, which have the near-lowest (and sometimes the lowest) complexity among all structures. For the scenario where latency has a higher priority than complexity, the isomorphic-directed-rooted-tree-based structures are proposed. The latency-optimal ones (as well as their lowest complexity) of such structures are obtained, which are proved to have the lowest latency among all structures.

Published
2024

3. Study on the Acceleration Process of BaTiO3 Particles during Vacuum Cold Spraying

Author

DENG Bixin, SUN Chengchuan, LU Jing, WU Yingdong, LU Teng, ZHANG Mina

Subjects
vacuum cold spraying, numerical simulation, particle velocity, batio3 coatings, particle image velocimetry, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

In this paper, the acceleration process of BaTiO3 ceramic particles under different vacuum cold spraying parameters was simulated, and the effect of process parameters on particle velocity was discussed. The results were verified using particle image velocimeter. BaTiO3 ceramic coatings were prepared using vacuum cold spraying method and their properties were tested. The simulation results showed that the particle velocity increased with the increase of gas pressure and preheating temperature. It was observed that under the same gas pressure and preheating temperature, the smaller the diameter of the particle, the more it was affected by the bow shock wave. The acceleration pattern of multiple particles was found to be similar to that of a single particle. According to the results obtained from particle image velocimetry, under the condition of and 300 K and 373 K at 0.2 MPa, the velocity of BaTiO3 particles differed from the simulation results by about 10.2% and 8.1%, respectively. Under the process parameters, as indicated by the simulation results, the continuous and dense BaTiO3 coatings with a thickness around 2 to 3 μm were fabricated by vacuum cold spraying, and the binding force was found to be 8 N. The research results indicated that the process parameters and their influence laws, obtained through numerical simulation combined with particle image velocimetry, were reliable and could be used to guide the preparation of flexible ceramic films.

Published
2024
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4. Parity-Check Matrix Partitioning for Efficient Layered Decoding of QC-LDPC Codes

Author

Lu, Teng, He, Xuan, Kang, Peng, Xing, Jiongyue, and Tang, Xiaohu

Subjects
Computer Science - Information Theory
Abstract

In this paper, we consider how to partition the parity-check matrices (PCMs) to reduce the hardware complexity and computation delay for the row layered decoding of quasi-cyclic low-density parity-check (QC-LDPC) codes. First, we formulate the PCM partitioning as an optimization problem, which targets to minimize the maximum column weight of each layer while maintaining a block cyclic shift property among different layers. As a result, we derive all the feasible solutions for the problem and propose a tight lower bound $\omega_{LB}$ on the minimum possible maximum column weight to evaluate a solution. Second, we define a metric called layer distance to measure the data dependency between consecutive layers and further illustrate how to identify the solutions with desired layer distance from those achieving the minimum value of $\omega_{LB}=1$, which is preferred to reduce computation delay. Next, we demonstrate that up-to-now, finding an optimal solution for the optimization problem with polynomial time complexity is unachievable. Therefore, both enumerative and greedy partition algorithms are proposed instead. After that, we modify the quasi-cyclic progressive edge-growth (QC-PEG) algorithm to directly construct PCMs that have a straightforward partition scheme to achieve $\omega_{LB} $ or the desired layer distance. Simulation results showed that the constructed codes have better error correction performance and smaller average number of iterations than the underlying 5G LDPC code.

Published
2022

16. Fluorinated polymer additives in Spiro-OMeTAD to improve the efficiency and stability of perovskite solar cells

Author

Tabi, Grace Dansoa, Nguyen, Dang-Thuan, Liang, Wensheng, Ji, Wenzhong, Lu, Teng, Trần-Phú, Thành, Lem, Olivier Lee Cheong, Mayon, Azul Osorio, Huang, Keqing, Chang, Li-Chun, Zhan, Hualin, Ahmad, Viqar, Mahmud, Arafat, Hou, Yihui, Wang, Wei, Bui, Anh Dinh, Nguyen, Hieu, Liu, Yun, Shen, Heping, Catchpole, Kylie R., Weber, Klaus J., White, Thomas P., Walter, Daniel, and Duong, The

Published
2024
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21. Tunable Optoelectronic Properties of WS$_2$ by Local Strain Engineering and Folding

Author

Khan, Ahmed Raza, Lu, Teng, Ma, Wendi, Lu, Yuerui, and Liu, Yun

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Local strain engineering is an exciting approach to tune the optoelectronic properties of materials. Two dimensional (2D) materials such as 2D transition metal dichalcogenides (TMDs) are particularly well suited for this purpose because they have high flexibility and they can withstand high deformations before rupture. Local strain engineering in 2D TMDs is achieved via strained wrinkles. Wrinkles on thick layers of TMDs are reported to show interesting photoluminescence enhancement due to bandgap modulation and funneling effect. However, the wrinkles in ultrathin TMDs have not been investigated because they can easily fall down to form folds in these ultrathin layers of TMDCs. Here, we have achieved both wrinkles and folds simultaneously in 1-3L WS2 using a new fabrication technique. A layer dependent reduction in surface potential is found for both folded layers and perfect pack layers due to the dominant interlayer screening effect. Strain dependent modulation in semi conductive junction properties is observed for strain induced wrinkles through current scanning. Thermo-ionic modelling suggests that the strained (1.6%) wrinkles can lower the Schottky barrier height (SBH) by 20%. Upon illumination, SBH reduces significantly due to photo-generated carriers. Our results present an important advance towards controlling the optoelectronic properties of atomically thin WS2 via strain engineering, with applications in optoelectronics, quantum optics and nanophotonics device fabrication., Comment: 23 pages, 4 figures

Published
2020

29. Antenna Array Design Based on Low-Temperature Co-Fired Ceramics

Author

Lu Teng, Zhongjun Yu, Dali Zhu, Chengxiang Hao, and Na Jiang

Subjects
LTCC, antenna array, substrate-integrated waveguide, millimeter wave, Mechanical engineering and machinery, TJ1-1570
Abstract

With the continuous development of wireless communication technology, the frequency band of 6G communication systems is moving towards higher frequencies such as millimeter waves and terahertz. In such high-frequency situations, wireless transmission requires antenna modules to be provided with characteristics of miniaturization, high integration, and high gain, which presents new challenges to the development of antenna technology. In this article, a 4 × 4 antenna array using multilayered low-temperature co-fired ceramic is proposed, operating in W-band, with a feeding network based on substrate-integrated waveguide, and an antenna element formed through the combination of a substrate-integrated cavity and surface parasitic patches, which guaranteed the array to possess the advantages of high integration and high gain. Combined with the substrate-integrated waveguide to a rectangular waveguide transition structure designed in the early stage, a physical array with a standard metal rectangular waveguide interface was fabricated and tested. The test results show that the gain of the antenna array is higher than 18 dBi from 88 to 98 GHz, with a maximum of 20.4 dBi.

Published
2024
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36. Cross-Knowledge Graph Entity Alignment via Neural Tensor Network

Author

Wang, Jingchu, Liu, Jianyi, Chen, Feiyu, Lu, Teng, Huang, Hua, Zhao, Jinmeng, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Qian, Zhihong, editor, Jabbar, M.A., editor, and Li, Xiaolong, editor

Published
2022
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48. Endovascular Aneurysm Treatment with the Numen Coil Embolization System: A Prospective Randomized Controlled Open-Label Multicenter Noninferiority Trial in China

Author

Zhao, Rui, Duan, Guoli, Yang, Pengfei, Li, Tianxiao, Guan, Sheng, Yang, Hua, Zhao, Zhenwei, Zhu, Xingen, Liang, Guobiao, Wu, Xin, Leng, Bing, Wang, Yang, Wu, Yina, Zuo, Qiao, Zhang, Lei, Li, ZiFu, Zhou, Yu, Zhao, Kaijun, Dai, Dongwei, Fang, Yibin, Li, Qiang, Huang, Qinghai, Hong, Bo, Xu, Yi, Liu, Jianmin, Kaixia, Zhang, Gong, Chen, Qingzhu, Ann, Yongtao, Zheng, Yingkun, He, Weixing, Bai, Xiaoyu, Kang, Ning, Wang, Min, Guan, Bin, Xu, Guangming, Duan, Li, Li, Liangfu, Zhu, Zhilong, Zhou, Qiuji, Shao, Kaitao, Chang, Liheng, Wu, Qiang, Li, Jianjun, Gu, Kun, Zhang, Yongfeng, Wang, Zhiyu, Zhao, Zhen, Chen, Haowen, Xu, Linyu, Wang, Xinbin, Guo, Chao, Liu, Feng, Fang, Zining, Liu, Yuanyuan, Guo, Hu, Chen, Zhongjun, Yan, Wei, Fang, Wenyan, Lu, Jiang, Li, Jianping, Deng, Zhihong, Li, Xu, Gao, Xiaogang, Wang, Yushu, Dong, Chuangzhong, Li, Song, Liu, Lu, Teng, Yuan, Yuan, Minghua, Shang, Zaiqiang, Zhang, Jing, Wang, Guifeng, Sang, Jiyong, Cheng, Zhen, Zhang, Xiaobing, Zhou, Yan, Chen, Lingfeng, Lai, Youqing, Dong, Guohua, Mao, Jianming, Zhu, Xianliang, Lai, Ziyun, Gao, Shuxin, Song, Minhua, Ye, Yijin, Fan, Xin, Xiang, Han, Peng, Jian, Yan, and Wenting, Fang

Published
2022
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50. Theoretical study of adsorption of gas (CO, CO2, NH3) by metal (Au, Ag, Cu)-doped single-layer WS2.

Author

Zhao, Danqi, Wen, Yang, Li, Zhiqiang, Cui, Yan, Zhao, Yimin, Lu, Teng-Fei, He, Ming, Song, Bo, and Zhang, Zhihua

Subjects
GAS absorption & adsorption, ORBITAL hybridization, MOLECULAR orbitals, DENSITY functional theory, COPPER, CHARGE transfer
Abstract

Context: The adsorptions of gas (CO, CO2, NH3) by metal (Au, Ag, Cu)-doped single layer WS2 are studied by density functional theory. The doping of metal atoms makes WS2 behave as n-type semiconductors. The final adsorption sites for CO, CO2, and NH3 are close to the atomic sites of the doped metal. The adsorptions of CO and NH3 gases on Cu/WS2, Ag/WS2, and Au/WS2 are dominated by chemisorption. The doped metal atoms enhance the hybridization of the substrate with the gas molecular orbitals, which contributes to the charge transfer and enhances the adsorption of the gas with the material surface. The adsorptions of CO and NH3 on Cu/WS2 and Ag/WS2 allow favorable desorption in a short time after heating. The single-layer Cu/WS2 is proved to have the potential to be used as a reliable recyclable sensor for CO. This work provides a theoretical basis for developing high-performance WS2-based gas sensors. Methods: In this paper, the adsorption energy, electronic structure, charge transfer, and recovery time of CO, CO2, and NH3 in the doped system have been investigated based on the CASTEP code of density functional theory. The exchange correlation function used is the Perdew-Burke-Ernzerhof (PBE) generalized gradient approximation (GGA). The TS (Tkatchenko-Scheffler) dispersion correction method was used to involve the effects of van der Waals interaction on the adsorption energies for all adsorption system. The ultrasoft pseudopotentials are chosen and the plane-wave cut-off energies are set to 500 eV. The k-point mesh generated by the Monkhorst package scheme is used to perform the numerical integration of the Brillouin zone and 5 × 5 × 1 k-point grid is used. The tolerances of total energy convergence, maximum ionic force, ionic displacement, and stress component are 1.0 × 10−5 eV/atom, 0.03 eV/Å, 0.001 Å, and 0.05 GPa, respectively. [ABSTRACT FROM AUTHOR]

Published
2024
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