Search

Your search keyword '"Lv, Qian"' showing total 987 results
Start Over Author "Lv, Qian"
987 results on '"Lv, Qian"'

153. On the Network Planning of Wavelength Switched Optical Networks With P2MP Transceivers

Author

Li, Ruoxing, Lv, Qian, and Zhu, Zuqing

Abstract

Recently, to cope with the ever-growing traffic volumes and network services in the Internet, the coherent point-to-multipoint transceivers (P2MP-TRXs) enabled by digital subcarrier modulation (DSCM) technique have been developed and viewed as a promising replacement of conventional point-to-point transceivers (P2P-TRXs), especially for the metro-aggregation networks with hub-and-spoke traffic patterns. Nevertheless, the network planning of wavelength switched optical networks (WSONs) with P2MP-TRXs can be rather complex, as additional correlated constraints are introduced to model the routing and spectrum assignment (RSA), and thus the problem cannot be solved with existing algorithms in the literature. In this article, we study the network planning of WSONs with P2MP-TRXs, which not only includes the aforementioned subproblem of correlated RSA, but also the placement of P2MP-TRXs in hub-leaf-based groups and the corresponding subcarrier (SC) assignments. We first formulate an integer linear programming (ILP) model to formally describe and exactly solve the network planning problem. Then, two polynomial-time heuristics, based on layered auxiliary graph (LAG) and conflict graph (CG), respectively, are proposed to find near-optimal solutions. Finally, we perform extensive simulations to evaluate the proposed algorithms, and the simulation results confirm their performance and effectiveness.

Published
2024
Full Text
View/download PDF

154. On the Survivable Multilayer Planning of Filterless Optical Networks With P2MP Transceivers

Author

Lv, Qian, Li, Ruoxing, and Zhu, Zuqing

Abstract

The rapid development of emerging network services are shifting the major communication scheme in metro-aggregation networks from unicast to in-cast and multicast, which has promoted the development of the point-to-multipoint coherent optical transceivers (P2MP-TRXs). Meanwhile, for its cost-effectiveness and energy-efficiency, filterless optical network (FON) has been considered as a promising optical infrastructure for metro-aggregation networks, and it is naturally compatible with P2MP-TRXs because they both rely on the broadcast-and-select scheme for communications. In this paper, we study the problem of survivable multilayer planning of FONs with P2MP-TRXs and design algorithms to ensure that the planned FON can protect itself against single-link failures. We first formulate a mixed integer linear programming (MILP) model to jointly optimize the routing of working and backup lightpaths of traffic demands, and the allocation of P2MP-TRXs, assignment of subcarriers (SCs) to P2MP-TRXs, spectrum assignment on fiber trees for setting up the lightpaths, such that the capital expenditures (CAPEX) of the planned FON is minimized. Then, to solve the problem more time-efficiently, we propose a polynomial-time heuristic based on auxiliary graphs (AGs) and lightpath grouping. Extensive simulations verify the performance of our proposals and indicate that they can outperform existing benchmarks.

Published
2024
Full Text
View/download PDF

155. On the Multilayer Planning of Filterless Optical Networks With OTN Encryption

Author

Lv, Qian and Zhu, Zuqing

Abstract

With enhanced cost-effectiveness, filterless optical networks (FONs) have been considered as a promising candidate for future optical infrastructure. However, as the transmission in FON relies on the “select-and-broadcast” scenario, it is more vulnerable to eavesdropping. Therefore, encrypting the communications in FONs will be indispensable, and this can be realized by introducing the optical transport network (OTN) encryption technologies that leverage high-speed encryption cards (ECs) to protect the integrity of OTN payload frames. In this paper, we study the problem of security-aware multilayer planning of FONs with OTN encryption. We first formulate a mixed integer linear programming (MILP) model (i.e., w-MILP) to solve the problem exactly. Then, to reduce the time complexity of problem-solving, we transform w-MILP into two correlated MILP models for establishing fiber trees for an FON (t-MILP) and planning flows in the fiber trees (s-MILP), respectively. The optimization in t-MILP is further transformed into a weighted set partitioning problem, which can be solved time-efficiently. As for s-MILP, we propose a polynomial-time approximation algorithm based on linear programming (LP) relaxation and randomized rounding. Extensive simulations verify the performance of our proposals.

Published
2023
Full Text
View/download PDF

158. Influencing factors of sleep disorders and sleep quality in healthcare workers during the COVID‐19 pandemic: A systematic review and meta‐analysis.

Author

Lv, Qian, Zhou, Wenguang, Kong, Yue, Chen, Silu, Xu, Baoling, Zhu, Fangfang, Shen, Xianying, and Qiu, Zhaojun

Subjects
SLEEP quality, MEDICAL databases, ONLINE information services, META-analysis, MEDICAL information storage & retrieval systems, CONFIDENCE intervals, SYSTEMATIC reviews, MEDICAL personnel, SLEEP disorders, RISK assessment, PSYCHOSOCIAL factors, RESEARCH funding, OCCUPATIONAL health services, MEDLINE, ODDS ratio, COVID-19 pandemic, DISEASE risk factors
Abstract

Aim: The aim of this study was to identify the influencing factors of sleep disorders and sleep quality in healthcare workers during the COVID‐19 pandemic. Design: Systematic review and meta‐analysis of observational research. Methods: The databases of the Cochrane Library, Web of Science, PubMed, Embase, SinoMed database, CNKI, Wanfang Data, and VIP were systematically searched. The quality of studies was assessed using the Agency for Healthcare Research and Quality evaluation criteria and the Newcastle–Ottawa scale. Results: A total of 29 studies were included, of which 20 were cross‐sectional studies, eight were cohort studies, and 1 was a case–control study; 17 influencing factors were finally identified. Greater risk of sleep disturbance was associated with female gender, single relationship status, chronic disease, insomnia history, less exercise, lack of social support, frontline work, days served in frontline work, department of service, night shift, years of work experience, anxiety, depression, stress, received psychological assistance, worried about being infected, and degree of fear with COVID‐19. Conclusions: During the COVID‐19 pandemic, healthcare workers did have worse sleep quality than the general population. The influencing factors of sleep disorders and sleep quality in healthcare workers are multifaceted. Identification and timely intervention of resolvable influencing factors are particularly important for preventing sleep disorders and improving sleep. Patient or Public Contribution: This is a meta‐analysis of previously published studies so there was no patient or public contribution. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

178. Novel Label-Free Electrochemical Impedance Immunosensor Using a Three-Dimensional Flower-Shaped Gold Nanoparticle@Molybdenum(IV) Sulfide/Graphene Composite for the Ultrasensitive Determination of Procalcitonin

Author

Lv, Qian, Liu, Haixin, and Chen, Longsheng

Abstract

Procalcitonin (PCT) is an inflammatory marker with significance in the early diagnosis of sepsis. The label-free electrochemical impedance immunosensor has good prospects for the determination of this disease marker due to its cost-effectiveness, high specificity and simple operation. However, developing an immunosensor for procalcitonin faces challenges due to the absence of satisfactory electrodes. Herein, a novel label-free electrochemical impedance immunosensor using the three-dimensional (3D) flower-shaped gold nanoparticle@molybdenum(IV) sulfide/graphene (Au NPs@MoS2/graphene) composite is reported for procalcitonin. Under the optimal conditions, the immunosensor presents a linear response from 10 fg mL−1 to 50 ng mL−1 and an ultra-low detection limit of 2.3 fg mL−1 for for procalcitonin. The excellent performance is due to the unique 3D flower-shape and the synergistic effect of Au NPs@MoS2/graphene, generating a large surface area, high electrical conductivity, and increased immobilization of anti-PCT. Additionally, the immunosensor exhibits suitable specificity, stability, and reproducibility, and was used to determine procalcitonin in serum which may allow clinical screening and diagnosis of sepsis.

Published
2023
Full Text
View/download PDF

181. Identification and analysis of microRNA editing events in recurrent bladder cancer based on RNA sequencing: MicroRNA editing level is a potential novel biomarker

Author

Qin, Jia-Xin, primary, Liu, Xing, additional, Wang, Xin-Lei, additional, Wang, Guang-Yue, additional, Liang, Qing, additional, Dong, Yang, additional, Pang, Kun, additional, Hao, Lin, additional, Xue, Liang, additional, Zhao, Yan, additional, Hu, Zheng-Xiang, additional, Li, Rui, additional, Lv, Qian, additional, Chao, Liu, additional, Meng, Fan-Lai, additional, Shi, Zhen-Duo, additional, and Han, Cong-Hui, additional

Published
2022
Full Text
View/download PDF

182. Targeted delivery of nuclear targeting probe for bladder cancer using cyclic pentapeptide c(RGDfK) and acridine orange

Author

Qin, Jiaxin, primary, Liang, Qing, additional, Wang, Guangyue, additional, Hao, Lin, additional, Liu, Xing, additional, Wang, Xinlei, additional, Hu, Zhengxiang, additional, Fang, Gaochuan, additional, Xue, Liang, additional, Zhao, Yan, additional, Li, Rui, additional, Lv, Qian, additional, Wen, Jiling, additional, Yang, Guosheng, additional, Han, Conghui, additional, and Shi, Zhenduo, additional

Published
2022
Full Text
View/download PDF

187. Ultrafast charge transfer in mixed-dimensional WO3-x nanowire/WSe2 heterostructures for attomolar-level molecular sensing.

Author

Lv, Qian, Tan, Junyang, Wang, Zhijie, Gu, Peng, Liu, Haiyun, Yu, Lingxiao, Wei, Yinping, Gan, Lin, Liu, Bilu, Li, Jia, Kang, Feiyu, Cheng, Hui-Ming, Xiong, Qihua, and Lv, Ruitao

Subjects
NANOWIRES, CHARGE transfer, HETEROSTRUCTURES, SERS spectroscopy, OXYGEN plasmas, METHYLENE blue
Abstract

Developing efficient noble-metal-free surface-enhanced Raman scattering (SERS) substrates and unveiling the underlying mechanism is crucial for ultrasensitive molecular sensing. Herein, we report a facile synthesis of mixed-dimensional heterostructures via oxygen plasma treatments of two-dimensional (2D) materials. As a proof-of-concept, 1D/2D WO3-x/WSe2 heterostructures with good controllability and reproducibility are synthesized, in which 1D WO3-x nanowire patterns are laterally arranged along the three-fold symmetric directions of 2D WSe2. The WO3-x/WSe2 heterostructures exhibited high molecular sensitivity, with a limit of detection of 5 × 10−18 M and an enhancement factor of 5.0 × 1011 for methylene blue molecules, even in mixed solutions. We associate the ultrasensitive performance to the efficient charge transfer induced by the unique structures of 1D WO3-x nanowires and the effective interlayer coupling of the heterostructures. We observed a charge transfer timescale of around 1.0 picosecond via ultrafast transient spectroscopy. Our work provides an alternative strategy for the synthesis of 1D nanostructures from 2D materials and offers insights on the role of ultrafast charge transfer mechanisms in plasmon-free SERS-based molecular sensing. 2D materials are promising substrates for surface-enhanced Raman scattering (SERS)-based molecular sensing, but their performance is usually inferior to their plasmonic counterparts. Here, the authors report the synthesis of 1D/2D WO3-x/WSe2 heterostructures, showing high molecular sensitivity associated to ultrafast charge transfer timescales of ~1 ps. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

188. Evaluation of evidence of prevention and management of facial pressure injuries in medical staff.

Author

Su, Honghong, Lv, Qian, Kong, Yue, Zeng, Huiling, Zhou, Wenguang, Zhu, Fangfang, Xu, Baoling, and Zhou, Qijun

Subjects
MEDICAL databases, CINAHL database, ONLINE information services, HOSPITAL medical staff, MEDICAL information storage & retrieval systems, SYSTEMATIC reviews, SKIN care, RESEARCH funding, FACIAL injuries, MEDLINE, DATA analysis software, PERSONAL protective equipment
Abstract

Aim: This systematic review evaluated the quality of evidence for the prevention and management of facial pressure injuries in medical staff. Design: This review was presented in accordance with the Preferred Reporting Items for Systematic Reviews and Meta‐Analyses guidelines. Methods: We retrieved the relevant studies from 19 databases. Using the literature evaluation standards and evidence grading system of the Australian Joanna Briggs Institute Evidence‐Based Health Care Center, we evaluated the quality of the literature encompassing different types of research and assessed their levels of evidence. Results: A total of 13 studies were included, including seven expert consensuses, two recommended practices, one clinical decision, one best practice information booklet, one systematic review and one randomized controlled trial. In the end, 31 best evidence were summarized, including skin cleaning and care, PPE placement and movement, reasonable use of dressings, treatment measures and education and training. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

189. CAV3 mediates IMGU and NIMGU in skeletal muscle and cardiac myocytes.

Author

ZHOU Cai-xia, LV Qian, BU Xiao-yang, TIAN Yi-fu, XIAN Jing, HUANG Yuan-heng, YANG Li-hui, and HUANG Qin

Subjects
MYOCARDIUM, SKELETAL muscle, SMALL interfering RNA, GLUCOSE transporters, PROTEIN expression
Abstract

Objective: To observe whether CAV3 is involved in the physiological process of IMGU and NIMGU. Downregulation of caveolin-3 (CAV3) protein expression by small interference RNAs (iRNA) has been studied. Insulin-mediated glucose uptake (IMGU) is critical in skeletal muscle and cardiac myocytes, but non - insulin -mediated glucose uptake (NIMGU) should not be neglected. Methods: CAV3 siRNAs were designed and transfected in C2C12 cells and H9c2 cells in skeletal muscle and cardiac muscle, respectively, and C2C12 and H9c2 cells were cultured in DMEM medium with and without insulin, respectively. Glucose transporter 4 (GLUT4) protein expression was detected by Western blot, and the glucose uptake rate of cells was measured by biochemical kit. Results: Transfection with CAV3 siRNA successfully down- regulated CAV3 protein expression in C2C12 and H9c2 cells. In the absence of insulin stimulation, GLUT4 expression was decreased (P<0.01) and glucose uptake was reduced (P<0.05) after 48 h of transfection in C2C12 cells, and GLUT4 expression was decreased (P<0.05) and glucose uptake was reduced (P<0.01) after 48 h of transfection in H9c2 cells. In the presence of insulin stimulation, GLUT4 expression was decreased (P<0.01) and glucose uptake was reduced (P<0.01) after 48 hours of transfection in C2C12 cells, and the down-regulation of GLUT4 was not statistically significant and glucose uptake was reduced (P<0.01) after 48 hours of transfection in H9c2 cells. Conclusion: Two different states, IMGU and NIMGU, exist in C2C12 cells and H9c2 cells. Both in the quiet state stimulated by insulin as well as in the absence of insulin stimulation, the cellular uptake of glucose is affected by GLUT4 changes regulated by CAV3. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

190. Comparison of the impact of Tripterygium wilfordii Hook F and Methotrexate treatment on radiological progression in active rheumatoid arthritis: 2-year follow up of a randomized, non-blinded, controlled study

Author

Zhou, Yang-zhong, Zhao, Li-dan, Chen, Hua, Zhang, Yan, Wang, Dan-feng, Huang, Lin-fang, Lv, Qian-wen, Liu, Bin, Li, Zhenbin, Wei, Wei, Li, Hongbin, Liao, Xiangping, Liu, Hui, Liu, Xiumei, Jin, Hongtao, Wang, Junxiang, Fei, Yun-yun, Wu, Qing-jun, Zhang, Wen, Shi, Qun, Zheng, Wen-jie, Zhang, Feng-chun, Tang, Fu-lin, Lipsky, Peter E., and Zhang, Xuan

Published
2018
Full Text
View/download PDF

199. Mapping brain-wide excitatory projectome of primate prefrontal cortex at submicron resolution and comparison with diffusion tractography

Author

Yan, Mingchao, primary, Yu, Wenwen, primary, Lv, Qian, additional, Lv, Qiming, additional, Bo, Tingting, additional, Chen, Xiaoyu, additional, Liu, Yilin, additional, Zhan, Yafeng, additional, Yan, Shengyao, additional, Shen, Xiangyu, additional, Yang, Baofeng, additional, Hu, Qiming, additional, Yu, Jiangli, additional, Qiu, Zilong, additional, Feng, Yuanjing, additional, Zhang, Xiao-Yong, additional, Wang, He, additional, Xu, Fuqiang, additional, and Wang, Zheng, additional

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results