Search

Your search keyword '"Cheng, Zhiqiang"' showing total 1,255 results
Start Over Author "Cheng, Zhiqiang"
1,255 results on '"Cheng, Zhiqiang"'

1. Cyclic and Negacyclic Sum-Rank Codes

Author

Chen, Hao, Ding, Cunsheng, Cheng, Zhiqiang, and Xie, Conghui

Subjects
Computer Science - Information Theory
Abstract

Sum-rank codes have known applications in the multishot network coding, the distributed storage and the construction of space-time codes. U. Mart\'{\i}nez-Pe\~{n}as introduced the cyclic-skew-cyclic sum-rank codes and proposed the BCH bound on the cyclic-skew-cyclic sum-rank codes in his paper published in IEEE Trans. Inf. Theory, vol. 67, no. 8, 2021. Afterwards, many sum-rank BCH codes with lower bounds on their dimensions and minimum sum-rank distances were constructed. Sum-rank Hartmann-Tzeng bound and sum-rank Roos bound on cyclic-skew-cyclic codes were proposed and proved by G. N. Alfarano, F. J. Lobillo, A. Neri, and A. Wachter-Zeh in 2022. In this paper, cyclic, negacyclic and constacyclic sum-rank codes are introduced and a direct construction of cyclic, negacyclic and constacyclic sum-rank codes of the matrix size $m \times m$ from cyclic, negacyclic and constacyclic codes over ${\bf F}_{q^m}$ in the Hamming metric is proposed. The cyclic-skew-cylic sum-rank codes are special cyclic sum-rank codes. In addition, BCH and Hartmann-Tzeng bounds for a type of cyclic sum-rank codes are developed. Specific constructions of cyclic, negacyclic and constacyclic sum-rank codes with known dimensions and controllable minimum sum-rank distances are proposed. Moreover, many distance-optimal binary sum-rank codes and an infinite family of distance-optimal binary cyclic sum-rank codes with minimum sum-rank distance four are constructed. This is the first infinite family of distance-optimal sum-rank codes with minimum sum-rank distance four in the literature.

Published
2024

2. Construction and Fast Decoding of Binary Linear Sum-Rank-Metric Codes

Author

Chen, Hao, Qi, Yanfeng, and Cheng, Zhiqiang

Subjects
Computer Science - Information Theory
Abstract

Sum-rank-metric codes have wide applications in the multishot network coding and the distributed storage. Linearized Reed-Solomon codes, sum-rank BCH codes and their Welch-Berlekamp type decoding algorithms were proposed and studied. They are sum-rank versions of Reed-Solomon codes and BCH codes in the Hamming metric. In this paper, we construct binary linear sum-rank-metric codes of the matrix size $2 \times 2$, from BCH, Goppa and additive quaternary Hamming metric codes. Larger sum-rank-metric codes than these sum-rank BCH codes of the same minimum sum-rank distances are obtained. Then a reduction of the decoding in the sum-rank-metric to the decoding in the Hamming metric is given. Fast decoding algorithms of BCH and Goppa type binary linear sum-rank-metric codes of the block length $t$ and the matrix size $2 \times 2$, which are better than these sum-rank BCH codes, are presented. These fast decoding algorithms for BCH and Goppa type binary linear sum-rank-metric codes of the matrix size $2 \times 2$ need at most $O(t^2)$ operations in the field ${\bf F}_4$. Asymptotically good sequences of quadratic-time encodable and decodable binary linear sum-rank-metric codes of the matrix size $2 \times 2$ satisfying $$R_{sr}(\delta_{sr}) \geq 1-\frac{1}{2}(H_4(\frac{4}{3}\delta_{sr})+H_4(2\delta_{sr})),$$ can be constructed from Goppa codes., Comment: 37 pages, submitted

Published
2023

6. Research on PSO and MLEM Hybrid Algorithm for NDP Spectrum Unfolding

Author

LI Yuanhui1,2, YANG Rui3, ZHANG Qingxian1, XIAO Caijin4, CHEN Hongjie1, XIAO Hongfei1, CHENG Zhiqiang

Subjects
neutron depth profiling analysis, particle swarm optimization algorithm, maximum likelihood expectation maximization algorithm, lithium battery, Nuclear engineering. Atomic power, TK9001-9401, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Neutron depth profiling (NDP) is a non-destructive analysis method which is widely used in lithium batteries, semiconductors, and other complex and high-precision industries. The NDP spectrum is the second particles of the interaction between neutrons and target nuclides, and then the content and spatial information of the target nuclides in the measured samples are obtained by unfolding the NDP spectrum. At present, the common NDP spectrum unfolding algorithm is the maximum likelihood expectation maximization (MLEM) algorithm. But in some case, the MLEM algorithm falls into the local optimal solution. In this paper, a hybrid PSO-MLEM algorithm by taking advantages of the wide search range of PSO (particle swarm optimization) and the fast convergence speed of MLEM was proposed. In the PSO-MLEM algorithm, the dynamic acceleration factor was used to balance the local optimal and the global optimal on the particle displacement in each iteration, which improved the convergence speed and the accuracy of the algorithm. The PSO-MLEM algorithm was applied to unfold the NDP spectra of lithium batteries with 0, 5, and 10 hours of charging and discharging, which were simulated by Geant4 tool. The unfolding results of PSO-MLEM algorithm were compared to the results of PSO algorithm, MLEM algorithm and singular value decomposition solving least squares (SVDLS) algorithm. The correlation coefficients of the unfolding result by PSO-MLEM algorithm and the reference distributions are 0.993, 0.984, and 0.946, respectively, and the relative average errors are 14.46%, 9.84%, and 9.41%. Compared with PSO algorithm, the convergence speed of PSO-MLEM algorithm is improved from 800 times to 100 times, and the relative error is reduced from about 50% to about 10%. To the MLEM algorithm, the PSO-MLEM algorithm improves the global optimization capability and avoids the problem of local optimal solution caused by the influence of the initial value of the MLEM algorithm, especially with the result of 0 hour. The SVDLS algorithm is worked well in unfolding NDP spectra except the NDP spectrum of lithium battery at 0 hour. Compared to result of SVDLS algorithm, the PSO-MLEM algorithm has better convergence properties and is numerically stable.

Published
2024
Full Text
View/download PDF

7. An Experimental and Simulation Study on Machining Damage of T-800 CFRP Multi-edge Milling Process

Author

Wang, Yiqi, Cheng, Zhiqiang, Song, Wanyue, Liu, Bochuan, Chen, Liangzi, Ceccarelli, Marco, Series Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, Agrawal, Sunil K., Advisory Editor, Carbone, Giuseppe, editor, and Laribi, Med Amine, editor

Published
2024
Full Text
View/download PDF

20. Is cryoablation still suitable for advanced non-small cell lung cancer after failure of first-line chemotherapy? A multicenter, prospective, randomized-controlled trial of eighty-seven patients

Author

Chen, Yu, Fang, Xueni, Wang, Dan, Li, Quanwang, Zhang, Kerui, Li, Yuan, Li, Jinghua, Pang, Haoyue, Cheng, Zhiqiang, Zhang, Chunyang, Zhang, Caiyun, Yang, Wuwei, Zhu, Baorang, Fan, Huanfang, Han, Changhui, An, Yonghui, Zhang, Lingling, Luo, Baoping, Zhang, Siqi, Lu, Taiying, Meng, Yuanyuan, Jiao, Qinshu, Tang, Houlin, Zhou, Tian, and Hu, Kaiwen

Published
2024
Full Text
View/download PDF

22. Toxic footprint and materials profile of electronic components in printed circuit boards

Author

Huang, Jinfeng, Deng, Yi, Han, Yunhui, Shu, Jiancheng, Wang, Rong, Huang, Sheng, Ogunseitan, Oladele A, Yu, Keli, Shang, Min, Liu, Yi, Li, Shuyuan, Han, Yubin, Cheng, Zhiqiang, and Chen, Mengjun

Subjects
Environmental Sciences, Pollution and Contamination, Responsible Consumption and Production, E-waste, Electronic components, Leaching Assessment, Printed Circuit Boards, Regulatory Policy, Toxic Footprint, Environmental Engineering, Building, Chemical engineering, Environmental management
Abstract

Waste printed circuit boards (WPCBs) contain valuable material resources and hazardous substances, thereby posing a challenge for sustainable resource recovery and environmental protection initiatives. Overcoming this challenge will require mapping the toxic footprint of WPCBs to specific materials and substances used in manufacturing electronic components (ECs). Therefore, this work collected 50 EC specimens from WPCBs in five ubiquitous consumer products, such as television, refrigerator, air conditioner, washing machine and computer. The work extracted and analyzed metal contents and used leachability assessments based on tests adopted by the regulatory policies from China and the United States. The work found that copper and iron are the most abundant constituents in ECs, with concentrations ranging 5.90-796.62 g/kg and 0-831.53 g/kg, respectively; whereas abundance of precious metal content is in the order of silver > gold > palladium > platinum, with silver concentration ranging 15-5290 mg/kg. The content of marginally-regulated toxic substance arsenic ranged 0-9700 mg/kg; whereas fully regulated toxic metals such as chromium, lead and mercury did not exceed the thresholds set by China and US standards. The work found new toxic threats from arsenic and selenium leached from 20 of 50 ECs exceeding regulatory standards. These results will aid manufacturers and recyclers in protecting workers' health and environmental quality from arsenic and selenium pollution, and should initiate discussion about regulating these toxic components as part of a comprehensive program to reduce the toxic footprint of electronic products.

Published
2022

40. Spatial bias in cAMP generation determines biological responses to PTH type 1 receptor activation

Author

White, Alex D, Peña, Karina A, Clark, Lisa J, Maria, Christian Santa, Liu, Shi, Jean-Alphonse, Frédéric G, Lee, Ji Young, Lei, Saifei, Cheng, Zhiqiang, Tu, Chia-Ling, Fang, Fei, Szeto, Nicholas, Gardella, Thomas J, Xiao, Kunhong, Gellman, Samuel H, Bahar, Ivet, Sutkeviciute, Ieva, Chang, Wenhan, and Vilardaga, Jean-Pierre

Subjects
Underpinning research, 1.1 Normal biological development and functioning, Cyclic AMP, Parathyroid Hormone, Receptors, Parathyroid Hormone, Biochemistry and Cell Biology
Abstract

The parathyroid hormone (PTH) type 1 receptor (PTHR) is a class B G protein–coupled receptor (GPCR) that regulates mineral ion, vitamin D, and bone homeostasis. Activation of the PTHR by PTH induces both transient cell surface and sustained endosomal cAMP production. To address whether the spatial (location) or temporal (duration) dimension of PTHR-induced cAMP encodes distinct biological outcomes, we engineered a biased PTHR ligand (PTH7d) that elicits cAMP production at the plasma membrane but not at endosomes. PTH7d stabilized a unique active PTHR conformation that mediated sustained cAMP signaling at the plasma membrane due to impaired β-arrestin coupling to the receptor. Experiments in cells and mice revealed that sustained cAMP production by cell surface PTHR failed to mimic the pharmacological effects of sustained endosomal cAMP production on the abundance of the rate-limiting hydroxylase catalyzing the formation of active vitamin D, as well as increases in circulating active vitamin D and Ca2+ and in bone formation in mice. Thus, similar amounts of cAMP generated by PTHR for similar lengths of time in different cellular locations, plasma membrane and endosomes, mediate distinct physiological responses. These results unveil subcellular signaling location as a means to achieve specificity in PTHR-mediated biological outcomes and raise the prospect of rational drug design based upon spatiotemporal manipulation of GPCR signaling.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results