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Key-frame reference selection for non-feedback video communication

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The Journal of China Universities of Posts and Telecommunications 2009年第5期16卷 92-102页

作者： PENG Qiang ZHANG Lei YANG Tian-wu CHEN Jim X zhu ce School of Information Science & Technology Southwest Jiaotong University Chengdu 610031 China School of Information Technology & Engineering George Mason University VA 22030 USA School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

This article addresses the problem of reference picture optimization in video communication over error prone networks. A novel estimation model for transmission distortion is proposed. This model is capable of recursively estimating the overall end-to-end distortion caused by quantization, error propagation, and error concealment. Simulation results show that this model can accurately estimate channel distortion. Then, based on the distortion estimation model, a new non-feedback key-frame reference picture selection （KRPS） algorithm is developed. The optimum reference picture minimizes the transmission distortion under the rate-distortion optimization framework. Extensive experiment results demonstrate that the proposed KRPS algorithm substantially achieves more peak signal to noise ratio （PSNR） gain over traditional prediction, especially in low bit-rate transmission.

关键词： End-to-end distortion key-frame reference picture selection error resilience

Multipath Routing of Multiple Description Coded Images in Wireless Networks

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Journal of Computer Science & Technology 2014年第4期29卷 576-588页

作者：徐媛媛朱策虞露 School of Electronic Engineering University of Electronic Science and Technology of China School of Electrical and Electronic Engineering Nanyang Technological University IEEE Institute of Information and Communication Engineering Zhejiang University

Multiple description coding （MDC） generates multiple decodable bitstreams for a source to combat informa- tion loss. In this paper, multipath routing problem for two-description coded images is investigated for traditional and coded wireless networks without and with coding capability at intermediate nodes, respectively. Firstly, we formulate an interference-aware MDC multipath routing for traditional networks by employing a time-division link scheduling method to eliminate wireless interference, and ultimately obtain an optimal path selection corresponding to the minimum achievable distortion. Secondly, for coded networks, we evaluate practical wireless network coding （NC） in delivering descriptions of multiple unicast sessions. While NC increases maximum supporting flow rate of MDC descriptions in wireless networks, possible undecodability of NC mixed information is alleviated by MDC. To minimize achievable distortion, a proposed interference-and-coding-aware MDC multipath routing strikes a good balance between minimizing side effect of wireless interference avoidance and maximizing NC opportunity. Simulation results validate the effectiveness of the two proposed schemes.

关键词： multiple description coding multipath routing network coding wireless interference

Clinical algorithm for preventing missed diagnoses of occult cervical spine instability after acute trauma: A case report

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World Journal of Clinical Cases 2021年第33期9卷 10369-10373页

作者： ce zhu Hui-Liang Yang Gi Hye Im Li-Min Liu Chun-Guang Zhou Yue-Ming Song Department of Orthopedic Surgery and Orthopedics Research Institute West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Emergency Medicine Rhode Island HospitalWarren Alpert Medical School of Brown UniversityProvidenceRI 02903United States

BACKGROUND Missed or delayed diagnosis of cervical spine instability after acute trauma can have catastrophic consequences for the patient,resulting in severe neurological ***,however,there is no consensus on the optimal strategy for diagnosing occult cervical spine ***,we present a case of occult cervical spine instability and provide a clinical algorithm to aid physicians in diagnosing occult instability of the cervical *** SUMMARY A 57-year-old man presented with cervical spine pain and inability to stand following a serious fall from a height of 2 *** obvious vertebral fracture or dislocation was found at the time on standard lateral X-ray,computed tomography,and magnetic resonance imaging(MRI).Subsequently,the initial surgical plan was unilateral open-door laminoplasty(C3-7)with alternative levels of centerpiece mini-plate fixation(C3,5,and 7).However,the intraoperative C-arm fluoroscopic X-rays revealed significantly increased intervertebral space at C5-6,indicating instability at this level that was previously unrecognized on preoperative *** finally performed lateral mass fixation and fusion at the C5-6 *** back at the preoperative images,we found that the preoperative T2 MRI showed non-obvious high signal intensity at the C5-6 intervertebral disc and posterior interspinous *** MRI of cervical spine trauma patients should be carefully reviewed to detect disco-ligamentous injury,which will lead to further cervical spine *** patients with highly suspected cervical spine instability indicated on MRI,lateral X-ray under traction or after anesthesia and muscle relaxation needs to be performed to avoid missed diagnoses of occult cervical instability.

关键词： Clinical algorithm Missed diagnoses Occult cervical spine instability Case report

In the wave of big data,can traditional medicine for the diagnosis and treatment of skeletal disorders be given a new lease of life?

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TMR Integrative Medicine 2023年第5期7卷 1-7页

作者： zhu-ce Shao Shu-Xiong Bi Third Hospital of Shanxi Medical University Shanxi Bethune HospitalShanxi Academy of Medical SciencesTongji Shanxi HospitalTaiyuan 030032China

In recent years,big data has become a buzzword in the internet sector,gradually being used in various industries and fields,and has already yielded considerable benefits in *** the past few years,big data has become increasingly important in healthcare based on the massive volume of clinical data and the increasing demand for personalized *** medicine,one of humanity’s fabulous creations,has also contributed actively to preventing and controlling new *** the development of the Internet,AI,cloud computing,the Internet of Things,and other high technologies in recent years,new vitality has been injected into the development of traditional *** has also provided strong support for conventional medicine to play a more excellent *** medicine is now flourishing and gradually moving into the era of big ***,there has been an increasing number of medical studies related to big data,but more studies are focused on cancer survival and cancer metastasis,which may be related to the fact that there are more free databases related to oncology,similar to the studies on big data related to skeletal diseases,but there are not many studies on the linkage between traditional medicine and big data for skeletal ***,how will the field of big data and traditional medicine combine and diagnose or treat skeletal-related diseases in the future?How can traditional medicine in skeletal disorders ride the current fast-growing big data train?Will big data bring a new lease of life to traditional medicine in skeletal disorders?This review intends to systematically elaborate on the current and future research in the direction of big data in relation to diagnosing and treating skeletal diseases in traditional medicine.

关键词： big data traditional medicine skeletal disorders review systematic review

Trends in research on osteoarthritis of the knee in conventional medicine:a bibliometric analysis based on big data from 1990-2022

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TMR Integrative Medicine 2023年第6期7卷 1-10页

作者： zhu-ce Shao Shu-Xiong Bi Third Hospital of Shanxi Medical University Shanxi Bethune HospitalShanxi Academy of Medical SciencesTongji Shanxi HospitalTaiyuan 030032China.

Background:Osteoarthritis of the knee(KOA)is a chronic degenerative *** is a growing concern due to its high incidence and the pain and other burdens it places on *** medicine is a health care model with a long history that includes nature-based treatments,psycho-psychological types of treatments,and *** medicine is also more effective in diagnosing and treating KOA,and it has never stopped researching *** are no bibliometric studies analyzing articles on the traditional medical diagnosis and management of *** study aimed to comprehensively analyze and analyze the general trends in the study of KOA in traditional medicine from a bibliometric ***:All articles reporting on KOA and traditional medicine from 1 January 1990 to 01 November 2022 were obtained from the Web of Science *** software such as CiteSpace,VOS Viewer and Scimago Graphica were used to analyse the publications,which included authors,citations,journals,references,countries where studies were published,institutions and research *** final visualisations were produced using this ***:A total of 769 articles were *** Tong was identified as the most contributing and published author in the field,and medicine was identified as the most reputable journal in the field of traditional medicine and osteoarthritis of the *** is a global leader in the field and a centre of collaboration in the field,with a major concentration of traditional medicine in Asia,which is consistent with the evidence that traditional medicine originated in *** to the data,“osteoarthritis”,“knee osteoarthritis”,“pain”,and“knee”and“hip”were identified as hot keywords for research in this ***:The results of this bibliometric study provide a snapshot of the current state of clinical research in the treatment of KOA in traditional medicine and are well placed to envisage future hotspots and possible trends,and ma

关键词： knee osteoarthritis traditional medicine bibliometrics visualized study research trends big data

Sequential sagittal alignment changes in the cervical spine after occipitocervical fusion

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World Journal of Clinical Cases 2022年第4期10卷 1172-1181页

作者： ce zhu Lin-Nan Wang Tai-Yong Chen Li-Li Mao Xi Yang Gan-Jun Feng Li-Min Liu Yue-Ming Song Department of Orthopedics Surgery and Orthopedics Research Institute West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Orthopedics Surgery The Second Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Department of Ultrasound Hospital of Traditional Chinese Medicine Affiliated to Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina

BACKGROUND There are few studies regarding sequential changes in the sagittal alignment of the upper and lower cervical regions of the spine after occipitocervical fusion(OCF).In addition,no comparisons of cervical sagittal alignment(CSA)between patients with craniocervical junction disorders(CJDs)and normal populations have been *** To compare the CSA of patients with CJDs with that of normal controls and investigate the sequential changes in the CSA of the upper and lower cervical spine after *** Eighty-four patients who underwent OCF(OCF group)and 42 asymptomatic volunteers(control group)were *** parameters,including the occipital to C2 angle(O-C2a),occipital and external acoustic meatus to axis angle(O-EAa),C2–7 angle(C2-7a),and pharyngeal inlet angle(PIA),were measured and compared pre-and *** correlations among the parameters were analyzed using Pearson’s correlation *** The O-C2a and PIA of the OCF group were smaller than those of the control group,while their O-EAa and C2-7a values were larger than those of the normal *** were no significant differences in O-C2a,C2-7a,or PIA in the OCF group at baseline,1 mo,or the final follow-up after *** Pearson’s correlation results showed that there were significant correlations between the OC2a and C2Ta,C2-7a,C2-7 sagittal vertical axis(SVA),and PIA at 1 mo after OCF surgery and between O-C2a and O-EAa,C2Ta,C2-7a,C2-7 SVA,and PIA at the final *** Patients with CJDs have a more kyphotic upper CSA and a more lordotic lower CSA than normal *** effectiveness of OCF surgery in restoring CSA may be limited by the realignment of the craniocervical junction being *** reduction in O-C2a after OCF surgery may increase C2-7a and decrease PIA.

关键词： Sagittal alignment Occipitocervical fusion Craniocervical disorders cervical spine Dysphagia

3D-printed auxetic-structured intervertebral disc implant for potential treatment of lumbar herniated disc

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Bioactive Materials 2023年第2期20卷 528-538页

作者： Yulin Jiang Kun Shi Luonan Zhou Miaomiao He ce zhu Jingcheng Wang Jianhua Li Yubao Li Limin Liu Dan Sun Ganjun Feng Yong Yi Li Zhang Analytical and Testing center Department of Orthopedic Surgery and Orthopedic Research InstituteSichuan UniversityChengdu610065China School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang621010China Advanced Composite Research Group(ACRG) School of Mechanical and Aerospace EngineeringQueen’s University BelfastBT95AHUK

In this study,a novel artificial intervertebral disc implant with modified“Bucklicrystal”structure was designed and 3D printed using thermoplastic *** new implant has a unique auxetic structure with building blocks joined“face-to-face”.The accompanied negative Poisson’s ratio enables its excellent energy absorption and stability under *** deformation and load distribution behavior of the implant under various loading conditions(bending,torsion,extension and flexion)has been thoroughly evaluated through finite element *** show that,compared to natural intervertebral disc and conventional 3D implant,our new implant exhibits more effective stress transfer and attenuation under practical loading *** implant’s ability to contract laterally under compression can be potentially used to alleviate the symptoms of lumbar disc ***,the biocompatibility of the implant was assessed in vitro and its ability to restore the physiological function of the disc segment was validated in vivo using an animal model.

关键词： Negative Poisson’s ratio Lumbar disc herniation Finite element simulation

Mitochondria-engine with self-regulation to restore degenerated intervertebral disc cells via bioenergetic robust hydrogel design

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Bioactive Materials 2024年第10期40卷 1-18页

作者： Juehan Wang Yulin Jiang ce zhu Zheng Liu Lin Qi Hong Ding Jing Wang Yong Huang Yubao Li Yueming Song Ganjun Feng Li Zhang Limin Liu Analytical&Testing center Department of Orthopedic Surgery and Orthopedic Research InstituteWest China HospitalSichuan UniversityChengdu610065China

Previous studies have confirmed that intervertebral disc degeneration(IDD)is closely associated with inflammation-induced reactive oxygen species(ROS)and resultant cell mitochondrial membrane potential(MMP)*** of ROS in an inflammatory environment is essential for breaking the vicious cycle of MMP ***,re-energizing the mitochondria damaged in the inflammatory milieu to restore their function,is equally ***,we proposed an interesting concept of mitochondrion-engine equipped with coolant,which enables first to“cool-down”the inflammatory environment,next to restore the MMP,finally to allow cells to regain normal energy metabolism through materials *** such,we developed a multifunctional composite composed of a reactive oxygen species(ROS)-responsive sodium alginate/gelatin hydrogel infused into a rigid 3D-printed thermoplastic polyurethane(TPU)*** TPU scaffold was coated with conductive polypyrrole(PPy)to electrophoretically deposit L-arginine,which could upregulate the Mammalian target of rapamycin(mTOR)pathway,thus increasing MMP and energy metabolism to stimulate extracellular matrix synthesis for IVD *** the ROS-responsive hydrogel acting as the“mito-engine coolant”could scavenge the excessive ROS to create a favorable environment for IVD cells *** by in vitro and in vivo evaluations,the mito-engine system markedly promoted the proliferation and collagen synthesis of nucleus pulposus cells while enhancing the mitochondrial respiration and MMP under oxidative *** and histological assessments in vivo revealed the efficacy of this system in IVD *** unique bioinspired design integrated biomaterial science with mitochondrial biology,presents a promising paradigm for IDD treatment.

关键词： Mitochondrial dysfunction Intervertebral disc degeneration L-arginine ROS scavenging Polyurethan scaffold

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飞机着陆下滑状态人-机系统动态特性分析

航空学报 2000年第6期21卷 500-503页

作者：朱策方振平北京航空航天大学509教研室北京100083

采用最优控制驾驶员模型在频率域内分析是理论评价电传操纵飞机着陆下滑状态飞行品质的一种有效方法。基于人 -机系统响应特性可揭示出驾驶员工作负荷和系统动态特性之间相互影响。驾驶员相位补偿作为驾驶员工作负荷的度量 ;取人 -机系... 详细信息

采用最优控制驾驶员模型在频率域内分析是理论评价电传操纵飞机着陆下滑状态飞行品质的一种有效方法。基于人 -机系统响应特性可揭示出驾驶员工作负荷和系统动态特性之间相互影响。驾驶员相位补偿作为驾驶员工作负荷的度量 ;取人 -机系统闭环带宽、开环高频峰值和飞行轨迹倾角误差均方值等指标来评价系统动态特性。这些评价准则与驾驶员主观评分之间具有很好的相关性。应用该方法对某电传操纵飞机进行分析。

关键词：人-机系统最优控制模型着陆下滑状态飞行品质