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Search Results: 1 - 10 of 144048 matches for " WANG Yi-tong "
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二维斑点追踪超声评价餐后低血压对左室心肌应变的影响
Evaluation of the effect of postprandial hypotension on left ventricular myocardial strain by 2D speckle tracking imaging

林艺彤,汪海娅
LIN Yi-tong
, WANG Hai-ya

- , 2016, DOI: 10.3969/j.issn.1674-8115.2016.06.020
Abstract: 目的 采用二维斑点追踪超声成像(2D-STI)定量评价餐后低血压(PPH)患者左心室心肌应变的早期损害。方法 入选首次诊断PPH患者20例,21例非PPH患者对照。应用2D-STI测定2组餐前及餐后1.5 h左心室整体纵向应变(GLS)、环周应变(GCS)和径向应变(GRS),同时用常规方法测量心脏结构和功能。结果 常规方法检测2组心脏结构功能无显著差异。餐前PPH组GLS显著低于非PPH组(P=0.02),GCS、GRS无显著差异。对比2组患者餐前、餐后心肌应变,发现PPH组餐后1.5 h GLS(P=0.045)显著下降,而非PPH组餐前餐后整体心肌应变无显著差异。采用Logistic 回归分析,餐前GLS(P=0.02,OR=0.46),餐后GLS(P=0.001,OR=0.27)、GCS(P=0.008,OR=0.41)、GRS(P=0.004,OR=0.33)和PPH具有显著相关性。餐后GLS的ROC曲线下面积(AUC=0.86, P=0.001)显著大于24 h平均SBP(AUC=0.66, P=0.08)和左室射血分数(AUC=0.44, P=0.47)。结论 PPH可能会引起心脏功能隐匿性损害。相比常规心脏超声检查,STI技术能更容易发现PPH左心室心肌功能的早期损害。
: Objective To quantitatively evaluate the early injury in left ventricular myocardial strain in patients with postprandial hypotension (PPH) by using 2D speckle tracking imaging (2D-STI). Methods Twenty patients who were first diagnosed with PPH (PPH group) and 21 patients without PPH (NPPH group) were recruited. The global longitudinal strain (GLS), global radial strain (GRS), and global circumferential strain (GCS) of left ventricle were measured before and 1.5 h after meal with 2D-STI. Meanwhile, cardiac structure and function were evaluated by conventional method. Results There was no significant difference in heart structure evaluated by conventional method between two groups. Before meal, GLS in the PPH group was significantly lower as compared with the NPPH group (P=0.02), but there was no significant difference in GCS and GRS. GLS in the PPH group was significantly decreased 1.5 h after meal as compared with that before meal (P=0.045), whereas there was no significant change in the overall myocardial strain in the NPPH group after meal. Logistic regression analysis showed that GLS before meal (P=0.02,OR=0.46), and GLS (P=0.001, OR=0.27), GCS (P=0.008,OR=0.41), and GRS (P=0.004,OR=0.33) after meal were significantly correlated to PPH. The area under the ROC curve of GLS after meal (AUC=0.86, P=0.001) was significantly greater than 24 h average SBP (AUC=0.66, P=0.08) and LVEF (AUC=0.44, P=0.47). Conclusion PPH may result in occult cardiac function injury. STI is superior to conventional echocardiography in detecting the early injury in left ventricular myocardial function for patients with PPH
基于OpenStack的云计算网络性能测量与分析
Performance measurement and analysis of cloud computing network based on OpenStack

王小艳,陈兴蜀,王毅桐,葛龙
WANG Xiao-yan
, CHEN Xing-shu, WANG Yi-tong, GE Long

- , 2018, DOI: 10.6040/j.issn.1671-9352.2.2017.303
Abstract: 摘要: 虚拟网络服务是云计算的一个核心服务,随着云计算技术的发展,虚拟网络服务的实现方法和技术越来越多,搭建网络高可用云计算平台是云服务提供商关注的热点问题。使用重放流量的方式生成背景流量,基于OpenStack云平台对云计算虚拟网络中虚拟路由服务、虚拟交换机及租户虚拟网络模式的不同实现方法和技术进行了分析和测量。详细对比了各种实现方法和技术并给出了适用场景,为云服务提供商搭建网络服务高可用云平台提供了参考和指南。
Abstract: Virtual network service is a core service of cloud computing. With the development of cloud computing, various methods and techniques of virtual network are implemented. It is a hotspot for the cloud service providers to build a high available cloud computing platform. The different methods and techniques for virtual routing service, virtual switch and tenant virtual network mode in cloud computing virtual network which based on the OpenStack cloud platform are analyzed and measured by using replay traffic to generate background traffic. A detailed comparison of various methods and techniques and the applicable scenarios are given, it provides the reference and guidance for cloud service provider to build network service cloud platform
一种IaaS多租户环境下虚拟机软件更新服务机制
A software update mechanism for virtual machines in IaaS multi-tenant environment

陈广瑞,陈兴蜀,王毅桐,葛龙
CHEN Guang-rui
, CHEN Xing-shu, WANG Yi-tong, GE Long

- , 2017, DOI: 10.6040/j.issn.1671-9352.2.2016.105
Abstract: 摘要: 针对当前IaaS环境下虚拟机中软件版本不易管理以及软件更新不及时带来的安全问题,研究了一种适用于云计算环境下租户虚拟机应用软件更新和系统补丁升级的服务机制。首先,该机制建立了统一的管理框架,实现了软件和补丁的便捷管理;其次,该机制借助Linux网络命名空间的方式将更新服务接入到不同租户的虚拟网络,实现了不同租户的更新服务的灵活接入和安全隔离;最后,针对更新相同软件和补丁的批量虚拟机,采用可靠多播的方式进行软件和补丁分发,大大减小了网络流量,节省了网络资源。实验结果表明,该机制可以有效地提高软件和补丁的分发效率、节省网络资源、减小CPU的消耗,同时保证不同租户更新服务的隔离性。
Abstract: To facilitate the management of software versions in Virtual Machines(VMs)in Infrastructure as a Service(IaaS)environment and reduce the potential security issue is introduced by outdated softwares, a software update mechanism was studied. Firstly, a unified management framework was proposed, and the update tasks are managed by platform instead of users themselves. And then, the mechanism accesses the update service to tenant network using Linux Network Namespace, and isolates the different tenants update services. Lastly, for the same update tasks, this mechanism distributes the software packages in reliable multicast way, which greatly reduces network traffics and saves network resources. The result showed that this mechanism could effectively improve the efficiency of software distribution, save the network resources, reduce the CPU consumption, and ensure the isolation of different tenants update services
Reform and practice of the undergraduate research ability cultivation and the excellent academic discipline construction
大学生科研创新能力培养和优良学风建设的改革与实践

ZHU Dao-li,Wang Kang-le,Chen Pei-lin,Ma Yi-tong,Ye Hui,Deng Zi-fa,
朱道立
,王康乐,陈佩林,马以桐,叶辉,邓自发

微生物学通报 , 2013,
Abstract: 大学生科研创新能力培养要依据学生个体所需, 对其进行不同层次的科研能力培养, 并规范培养方式, 使学生真正学有所用。优良学风建设, 通过严抓学风, 让学生自主学习、诚信学习, 提高教育教学质量, 培养高素质人才, 促进高校可持续发展。高校推行本科生导师制使学生更趋向个性化学习、发挥学生的潜力、培养学生的创新能力。
CRITICAL CURRENT DENSITY OF Y-Ba-Cu-Sn-O SUPERCONDUCTORS

FENG YONG,ZHOU LIAN,WANG KE-GUANG,DU MING-HUAN,ZHANG YU-HENG,LU YA-FENG,JIN XIN,ZHANG YI-TONG,JIN JI-RONG,YAO XI-XIAN,

中国物理 B , 1993,
Abstract: The magnetic curves of bulk Y-Ba-Cu-Sn-O have been studied in the temperature range 60-77K and in fields up to 2.4T. The results indicate that Jc varies with the magnetic field as a power law and decreases exponentially with temperature. The critical current density Jc can be improved by the substitution of Sn for Cu.
Evaluation of genotoxicity of combined soil pollution by cadmium and phenanthrene on earthworm
ZHU Jiang,ZHAO Zuo-yuan,LU Yi-tong,
ZHU Jiang
,ZHAO Zuo-yuan,LU Yi-tong

环境科学学报(英文版) , 2006,
Abstract: The DNA-damaging effects of the combined pollution of heavy metal and organic contamination on earthworms were evaluated by single cell gel electrophoresis (SCGE) assay. Earthworms Eisenia andrei were exposed to single or combined test compounds in different doses of cadmium (Cd) 5, 10, 50 mg/kg and phenanthrene (Phe) 0.5, 2.5, 12.5 mg/kg with a treatment of 14 d. In SCGE assay, isolated coelomcytes and electrophoresis were employed to determine DNA damage degree after a 14-d treatment by test compounds. The results showed that there was a significant statistical difference between earthworms treated with Cd combined Phe with them treated alone with Cd or Phe. The Olive tail moment (OTM) of SCGE assay using earthworm coelomcytes appears to be a sensitive biomarker for evaluating exposure to genotoxic compounds. These tests also revealed that the interaction between Cd and Phe to DNA damaging effects was negative, and was strongly dependent on the concentration of pollution. This study corresponds to exploratory phase in order to reveal interaction effects of heavy metal and organic contamination on earthworms and then to set up more in-depth analysis to increase progressively the understanding of the genotoxicity mechanisms involved.
FLUX CREEP, FLUX PINNING AND CRITICAL CURRENT DENSITY OF Y-, Gd-, AND Tl-BASED SUPERCONDUCTIVE THIN FILMS

SHI ZHI-XIANG,JI HE-LIN,ZHANG YI-TONG,JIN XIN,XU XIAO-NONG,DING SHI-YING,YAO XI-XIAN,WANG CHANG-AN,WANG RUI-LAN,LI HONG-CHENG,ZHANG HUI,SUN ZHI-JIAN,YANG SEN-ZU,

中国物理 B , 1994,
Abstract:
MEASUREMENT OF ANISOTROPIC ACTIVATION ENERGIES IN HIGH-Tc SUPERCONDUCTORS

FAN HONG-CHANG,ZHANG YI-TONG,JIN XIN,YAO XI-XIAN,

中国物理 B , 1993,
Abstract: For single crystalline and melt-textured samples there exist several different activation energies for fluxoid creep, which are related to various vortex orientations and hopping directions. We discuss how to obtain these anisotropic activation energies from magnetic relaxation data and present measured results of a melt-textured YBCO sample.
Research and Realization of Data Backup and Disaster Recovery on Quantity Value Dissemination Business Management System
量值传递业务管理系统容灾备份的研究与实现

ZHANG Ming,LI Li,LIU Yi-Tong,
张明
,李丽,刘羿彤

计算机系统应用 , 2013,
Abstract: Along with the IT technical development application in quantity value dissemination system, data security of NIM MIS is the key factor in quantity value dissemination. In this paper, based on the demand of NIM MIS data backup and disaster recovery programs, combined with the actual situation of business, point of a different solution. By this way, we could realization data backup and quickly recovery, the quantity value dissemination could safety develop.
CBCT转化的二维平片与头颅侧位片对上气道二维测量的比较研究
Comparative Study of Two Dimensional Measurements of Upper Airway by Two Dimensional Plain Film Transformed by CBCT and Lateral Head of Skull.

孟怡彤, 张晓东
MENG Yi-tong
, ZHANG Xiao-dong.

- , 2018, DOI: 10.13701/j.cnki.kqyxyj.2018.10.021
Abstract: 摘要 目的: 研究三维CBCT转化的二维侧位片(CCB)和数值化头颅侧位片(LCR)对于上气道相同解剖部位的测量结果是否有差异,并且进行两种测量方法的可靠性分析。方法: 将个别正常牙合志愿者的CCB和LCR分别导入Winceph8.0中进行上气道矢状面的距离测量;同一测试者分别进行3次测量; 采用SPSS24.0统计软件,进行组内相关系数、配对t检验来检验不同测量的可靠性和统计学差异。结果: 个别正常牙合志愿者的CCB和LCR分别对上气道进行测量,测量结果符合正态分布后,用配对t检验发现两组不同测量方法所得的PNS-Ba、PNS-Ad1、H-C3、H-FH有统计学差异;每项测量项目都进行3次测量,发现ICC值均大于0.75,说明两种测量方法可靠性均较高,但CBCT转化的二维平片ICC平均值为0.930,而头颅侧位片的ICC平均值为0.830,说明CBCT转化所得的二维平片可靠性高于头颅侧位片。结论: 个别正常牙合的CCB和LCR在骨性标志点的测量值有统计学差异,而软组织标志点的测量值则没有统计学差异;两种测量方法可靠性均较高,但CCB可重复性高于LCR
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