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A Fast Vision-inertial Odometer Based on Line Midpoint Descriptor

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International Journal of Automation and computing 2021年第4期18卷 667-679页

作者： Wen-kuan Li Hao-Yuan Cai Sheng-Lin Zhao Ya-Qian liu Chun-Xiu liu State Key Laboratory of Transducer Technology Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

Visual simultaneous localization and mapping(VSLAM) are essential technologies to realize the autonomous movement of vehicles. Visual-inertial odometry(VIO) is often used as the front-end of VSLAM because of its rich information, lightweight, and robustness. This article proposes the FPL-VIO, an optimization-based fast vision-inertial odometer with points and lines. Traditional VIO mostly uses points as landmarks;meanwhile, most of the geometrical structure information is ignored. Therefore, the accuracy will be jeopardized under motion blur and texture-less area. Some researchers improve accuracy by adding lines as landmarks in the ***, almost all of them use line segment detector(LSD) and line band descriptor(LBD) in line processing, which is very time-consuming. This article first proposes a fast line feature description and matching method based on the midpoint and compares the three line detection algorithms of LSD, fast line detector(FLD), and edge drawing lines(EDLines). Then, the measurement model of the line is introduced in detail. Finally, FPL-VIO is proposed by adding the above method to monocular visual-inertial state estimator(VINSMono), an optimization-based fast vision-inertial odometer with lines described by midpoint and points. Compared with VIO using points and lines(PL-VIO), the line processing efficiency of FPL-VIO is increased by 3-4 times while ensuring the same accuracy.

关键词： High efficiency visual-inertial odometry(VIO) non-linear optimization points and lines sliding window

Hyperoside protects the blood-brain barrier from neurotoxicity of amyloid beta 1–42

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Neural Regeneration Research 2018年第11期13卷 1974-1980页

作者： Chen-Yang liu kuan Bai Xiao-Hui liu Li-Mi Zhang Gu-Ran Yu Department of Neurology Jiangsu Traditional Chinese Medicine Hospital the Affiliated Hospital of Nanjing University of Traditional Chinese Medicine Nanjing Jiangsu Province China Graduate School of Nanjing University of Traditional Chinese Medicine Nanjing Jiangsu Province China

Mounting evidence indicates that amyloid β protein（Aβ） exerts neurotoxicity by disrupting the blood-brain barrier（BBB） in Alzheimer＇s disease. Hyperoside has neuroprotective effects both in vitro and in vivo against Aβ. Our previous study found that hyperoside suppressed Aβ1-42-induced leakage of the BBB, however, the mechanism remains unclear. In this study, bEnd.3 cells were pretreated with 50, 200, or 500 μM hyperoside for 2 hours, and then exposed to Aβ1-42 for 24 hours. Cell viability was determined using 3-（4,5-dimethyl-2-thiazolyl）-2,5-diphenyl-2-H-tetrazolium bromide assay. Flow cytometry and terminal deoxynucleotidyl transferase-mediated d UTP nick-end labeling assay were used to analyze cell apoptosis. Western blot assay was carried out to analyze expression levels of Bax, Bcl-2, cytochrome c, caspase-3, caspse-8, caspase-9, caspase-12, occludin, claudin-5, zonula occludens-1, matrix metalloproteinase-2（MMP-2）, and MMP-9. Exposure to Aβ1-42 alone remarkably induced bEnd.3 cell apoptosis; increased ratios of cleaved caspase-9/caspase-9, Bax/Bcl-2, cleav ed caspase-8/caspase-8, and cleaved caspase-12/caspase-12; increased expression of cytochrome c and activity of caspase-3; diminished levels of zonula occludens-1, claudin-5, and occludin; and increased levels of MMP-2 and MMP-9. However, hyperoside pretreatment reversed these changes in a dose-dependent manner. Our findings confirm that hyperoside alleviates fibrillar Aβ1-42-induced BBB disruption, thus offering a feasible therapeutic application in Alzheimer＇s disease.

关键词： nerve regeneration Alzheimer's disease amyloid beta 1-42 blood-brain barrier bEnd.3 cells tight junction proteins hyperoside anti-apoptosis neural regeneration

Effect of Solvent on the Extraction of Microalgae Lipid for Biodiesel Production

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Chemical Research in Chinese Universities 2016年第4期32卷 625-629页

作者： kuan Dingyaw DU Wei DAI Lingmei MA Gaojian liu Dehua Department of Chemical Engineering Tsinghua University Beo'ing 100084 P. R. China

The effect of solvent on the microalgae lipid extraction was studied. The efficiency of lipid extraction from microalgae was found to differ according to the solvent used. The existence of formic acid contributed to the extraction of lipid to a great extent. With 8 mg/L formic acid existing in the system, the lipid yield and free fatty methyl ester（FAME） yield increased from 39% to 42% and from 81% to 90% respectively compared to those of the control. The highest lipid yield of 42% was achieved from Chlorella protothecoidesis with an FAME yield of 89% when a mixed solvent of 14 mL/g dichloromethane, 2 mL/g methanol and 4 mL/g formic acid was used.

关键词： Microalgae Lipid extraction Biodiesel

Crosslinked solubilizer enables nitrate-enriched carbonate polymer electrolytes for stable,high-voltage lithium metal batteries

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Science Bulletin 2024年第2期69卷 209-217页

作者： Chuyang Jing kuan Dai Dong liu Wenran Wang Libao Chen Chunxiao Zhang Weifeng Wei State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Materials and Chemical Engineering Hunan Institute of EngineeringXiangtan 411104China

High-voltage lithium metal batteries(LMBs)have been considered promising next-generation highenergy-density ***,commercial carbonate electrolytes can scarcely be employed in LMBs owing to their poor compatibility with metallic lithium.N,N-dimethylacrylamide(DMAA)-a crosslinkable solubilizer with a high Gutmann donor number-is employed to facilitate the dissolution of insoluble lithium nitrate(LiNO3)in carbonate-based electrolytes and to form gel polymer electrolytes(GPEs)through in situ *** Lit solvation structure of the GPEs is regulated using LiNO3 and DMAA,which suppresses the decomposition of LiPFe and facilitates the formation of an inorganic-rich solid electrolyte ***,the Coulombic efficiency(CE)of the LillCu cell assembled with a GPE increases to 98.5%at room temperature,and the high-voltage LillNCM622 cell achieves a capacity retention of 80.1%with a high CE of 99.5%after 400 *** bifunctional polymer electrolytes are anticipated to pave the way for next-generation high-voltage LMBs.

关键词： Crosslinked solubilizer Lithium nitrate Carbonate electrolytes Gel polymer electrolytes Lithium metal batteries

BCDC： A High-Performance, Server-Centric Data Center Network

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Journal of Computer Science & Technology 2018年第2期33卷 400-416页

作者： Xi Wang Jian-Xi Fan Cheng-kuan Lin Jing-Ya Zhou Zhao liu School of Computer Science and Technology Soochow University Suzhou 215006 China School of Software and Services Outsourcing Suzhou Institute of Industrial Technology Suzhou 215004 China

The capability of the data center network largely decides the performance of cloud computing. However, the number of servers in the data center network becomes increasingly huge, because of the continuous growth of the application requirements. The performance improvement of cloud computing faces great challenges of how to connect a large number of servers in building a data center network with promising performance. Traditional tree-based data center networks have issues of bandwidth bottleneck, failure of single switch, etc. Recently proposed data center networks such as DCell, FiConn, and BCube, have larger bandwidth and better fault-tolerance with respect to traditional tree-based data center networks. Nonetheless, for DCell and FiConn, the fault-tolerant length of path between servers increases in case of failure of switches; BCube requires higher performance in switches when its scale is enlarged. Based on the above considerations, we propose a new server-centric data center network, called BCDC, based on crossed cube with excellent performance. Then, we study the connectivity of BCDC networks. Furthermore, we propose communication algorithms and fault-tolerant routing algorithm of BCDC networks. Moreover, we analyze the performance and time complexities of the proposed algorithms in BCDC networks. Our research will provide the basis for design and implementation of a new family of data center networks.

关键词： data center network interconnection network crossed cube server-centric fault-tolerant

The normalizations and related dynamic processes for two power indexes

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Journal of Control and Decision 2017年第3期4卷 179-193页

作者： Yu-Hsien Liao Pang-tung liu Ling-Yun Chung Department of Applied Mathematics National Pingtung UniversityPingtungTaiwan Graduate School of Technological and Vocational Education National Yunlin University of Science and TechnologyDouliouTaiwan

Here,we introduce the normalisations for the marginal index and the Banzhaf–Owen index,*** show that there exists reduced games that could be adopted to characterise these two ***,alternative formulations are also proposed by applying excess *** on reduced games and excess functions,we provide different dynamic processes for these two normalisations.

关键词： Normalisation reduced game excess function dynamics process

Soluble Polyimide-reinforced TGDDM and DGEBA Epoxy Composites

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Chinese Journal of Polymer Science 2020年第8期38卷 867-876,I0007页

作者： Qi Chen Shun Wang Feng Qin kuan liu Qian liu Qing Zhao Xing-Yi Wang Yan-Hong Hu Research Institute of Industrial Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Polyimide(PI)synthesized from aromatic diamine and dianhydrides via two-step poly-condensation method was highly soluble in TGDDM(MY-720)and DGEBA(E-51)at desirable ***-PI(M-PI)and DGEBA-PI(E-PI)composites within 0.5%-3%PI loading could be prepared without organic *** the cryogenically fractured surfaces of M-PI and E-PI composites,no obvious heterogeneous phase was observed by *** mechanical properties were promoted significantly by PI,especially for impact *** 2%PI-2W into MY-720 and E-51 composites,the impact strength increased to 21 and 51 kJ/m2,the tensile strength increased by 62%and 19%,and the flexural strength by 18%and 13%,respectively,with slight increases in tensile *** results were related to the promotion in plasticity of composites and changes in fragile→ductile fracture ***,Tg and thermal stability of M-PI and E-PI were increased effectively.

关键词： Polyimide TGDDM and DGEBA epoxy resin Impact strength Toughness

Healthcare practice strategies for integrating personalized medicine:Management of COVID-19

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World Journal of Clinical Cases 2021年第29期9卷 8647-8657页

作者： Wen-Yi liu Ching-Wen Chien Tao-Hsin tung Department of Health Policy and Management Bloomberg School of Public HealthJohns Hopkins UniversityMD 21205United StatesShanghai Bluecross Medical Science InstituteShanghai 201100Shanghai ProvinceChina Institute for Hospital Management Tsing Hua UniversityShenzhen CampusShenzhen 518055Guangdong ProvinceChina Evidence-based Medicine Center Taizhou Hospital of Zhejiang Province Affiliated to Wenzhou Medical UniversityLinhai 317000Zhejiang ProvinceChina

Personalized medicine is the tailor-made clinical treatment to the individual characteristics of each *** may be considered an extension of traditional approaches to knowing and treating *** medicine has the potential to change the way of identification and management of health *** disease 2019(COVID-19)is an infectious disease that primarily affects the patients’*** first case of pneumonia of unknown cause was reported in Wuhan,China on December 31,*** thus,we are quickly approaching the era of personalized *** review discusses the practices currently used in the management of COVID-19 and how they relate to person-alized medicine.

关键词： Healthcare Personalized medicine COVID-19 SARS-CoV-2

Wideband mid-infrared thermal emitter based on stacked nanocavity metasurfaces

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International Journal of Extreme Manufacturing 2022年第1期4卷 133-141页

作者： Tun Cao Meng Lian kuan liu Xianchao Lou Yaoming Guo Dongming Guo School of Optoelectronic Engineering and Instrumentation Science Dalian University of TechnologyDalianPeople’s Republic of China Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianPeople’s Republic of China

Efficient thermal radiation in the mid-infrared(M-IR)region is of supreme importance for many applications including thermal imaging and sensing,thermal infrared light sources,infrared spectroscopy,emissivity coatings,and *** ability to control light makes metasurfaces an attractive platform for infrared ***,different metamaterials have been proposed to achieve high thermal *** date,broadening the radiation bandwidth of a metasurface emitter(meta-emitter)has become a key goal to enable extensive *** experimentally demonstrate a broadband M-IR thermal emitter using stacked nanocavity metasurface consisting of two pairs of circular-shaped dielectric(Si;N;)–metal(Au)stacks.A high thermal radiation can be obtained by engineering the geometry of nanocavity *** a meta-emitter provides wideband and broad angular absorptance of both p-and s-polarized light,offering a wideband thermal radiation with an average emissivity of more than 80%in the M-IR atmospheric window of 8–14μ*** experimental illustration together with the theoretical framework establishes a basis for designing broadband thermal emitters,which,as anticipated,will initiate a promising avenue to M-IR sources.

关键词： mid-infrared wideband perfect thermal radiation surface plasmon resonance metasurface nanocavity