Kernel-based virtual machine事件跟踪机制的设计与实现

分析了基于处理器硬件虚拟化技术实现的KVM子系统的架构。针对KVM跟踪独立事件信息的局限性,提出一种新的KVM事件跟踪机制(kvmtrace)来达到性能调节的目的,并使用relayfs接口进行了设计与实现。同时探讨了Linux kernel Markers实现机制及其在kvmtrace的实际应用。

A Network-Based VPN Architecture Using Virtual Routing

A network-based Virtual Private Network (VPN) architecture by using fundamental routing mechanism is proposed. This network is a virtual overlay network based on the relay of IP-in-IP tunneling of virtual routing modules. The packet format employs the encapsulation of IPSec ESP(Encapsulating Security Payload), an impact path code and an extended DS(Differentiated Services) code to support multi-path routing and QoS. Comparing with other models of VPN, this network system can be deployed in the current network with little investment, and it is easy to implement. The simulation result shows its performance is better than the traditional VPN system of black box mode.

Mechanism of Kinect-based virtual reality training for motor functional recovery of upper limbs after subacute stroke

The Kinect-based virtual reality system for the Xbox 360 enables users to control and interact with the game console without the need to touch a game controller, and provides rehabilitation training for stroke patients with lower limb dysfunctions. However, the underlying mechanism remains un- clear. In this study, 18 healthy subjects and five patients after subacute stroke were included. The five patients were scanned using functional MRI prior to training, 3 weeks after training and at a 12-week follow-up, and then compared with healthy subjects. The FugI-Meyer Assessment and Wolf Motor Function Test scores of the hemiplegic upper limbs of stroke patients were significantly increased 3 weeks after training and at the 12-week follow-up. Functional MRI results showed that contralateral primary sensorimotor cortex was activated after Kinect-based virtual reality training in the stroke patients compared with the healthy subjects. Contralateral primary sensorimotor cortex, the bilateral supplementary motor area and the ipsilateral cerebellum were also activated during hand-clenching in all 18 healthy subjects. Our findings indicate that Kinect-based virtual reality training could promote the recovery of upper limb motor function in subacute stroke patients, and brain reorganization by Kinect-based virtual reality training may be linked to the contralateral sen- sorimotor cortex.

Switching Delay Aware Computing Resource Allocation in Virtualized Base Station

In centralized cellular network architecture,the concept of virtualized Base Station(VBS) becomes attracting since it enables all base stations(BSs) to share computing resources in a dynamic manner. This can significantly improve the utilization efficiency of computing resources. In this paper,we study the computing resource allocation strategy for one VBS by considering the non-negligible effect of delay introduced by switches. Specifically,we formulate the VBS's sum computing rate maximization as a set optimization problem. To address this problem,we firstly propose a computing resource schedule algorithm,namely,weight before one-step-greedy(WBOSG),which has linear computation complexity and considerable performance. Then,OSG retreat(OSG-R) algorithm is developed to further improve the system performance at the expense of computational complexity. Simulation results under practical setting are provided to validate the proposed two algorithms.

Virtual population pharmacokinetic using physiologically based pharmacokinetic model for evaluating bioequivalence of oral lacidipine formulations in dogs

The aim of the present study was to investigate virtual population pharmacokinetic using physiologically based pharmacokinetic(PBPK) model for evaluating bioequivalence of oral lacidipine formulations in dogs. The dissolution behaviors of three lacidipine formulations including one commercial product and two self-made amorphous solid dispersions(ASDs)capsules were determined in 0.07% Tween 80 media. A randomized 3-period crossover design in 6 healthy beagle dogs after oral administration of the three formulations at a single dose of 4 mg was conducted. The PBPK modeling was utilized for the virtual bioequivalence study.In vitro dissolution experiment showed that the dissolution behaviors of lacidipine amorphous solid dispersions(ASDs) capsules, which was respectively prepared by HPMC-E5 or Soluplus, as polymer displayed similar curves compared with the reference formulation in 0.07% Tween 80 media. In vivo pharmacokinetics experiments showed that three formulations had comparable maximum plasma drug concentration(Cmax), and the time(Tmax) to reach Cmax of lacidipine tablet, which was prepared by Soluplus, as polymer was slower than other two formulations in consistency with the in vitro dissolution rate. The 90% confidence interval(CI) for the Cmax, AUC0–24 h and AUC0–∞ of the ratio of the test drug to the reference drug exceeded the acceptable bioequivalence(BE) limits(0.80–1.25). However, the 90% CI of the AUC0–24 h, AUC0–∞ and Cmax of the ratio of test to reference drug were within the BE limit,calculated using PBPK modeling when the virtual subjects reached 24 dogs. The results all demonstrated that virtual bioequivalence study can overcome the inequivalence caused by inter-subject variability of the 6 beagle dogs involved in in vivo experiments.

Virtual local target method for avoiding local minimum in potential field based robot navigation

A novel robot navigation algorithm with global path generation capability is presented. Local minimum is a most intractable but is an encountered frequently problem in potential field based robot navigation.Through appointing appropriately some virtual local targets on the journey, it can be solved effectively. The key concept employed in this algorithm are the rules that govern when and how to appoint these virtual local targets. When the robot finds itself in danger of local minimum, a virtual local target is appointed to replace the global goal temporarily according to the rules. After the virtual target is reached, the robot continues on its journey by heading towards the global goal. The algorithm prevents the robot from running into local minima anymore. Simulation results showed that it is very effective in complex obstacle environments.

V–L decomposition of a novel full-waveform lidar system based on virtual instrument technique

A novel three-dimensional（3D） imaging lidar system which is based on a virtual instrument technique is introduced in this paper. The main characteristics of the system include： the capability of modeling a 3D object in accordance with the actual one by connecting to a geographic information system（GIS）, and building the scene for the lidar experiment including the simulation environment. The simulation environment consists of four parts： laser pulse, atmospheric transport,target interaction, and receiving unit. Besides, the system provides an interface for the on-site experiment. In order to process the full waveform, we adopt the combination of pulse accumulation and wavelet denoising for signal enhancement.We also propose an optimized algorithm for data decomposition： the V-L decomposition method, which combines Vondrak smoothing and laser-template based fitting. Compared with conventional Gaussian decomposition, the new method brings an improvement in both precision and resolution of data decomposition. After applying V-L decomposition to the lidar system, we present the 3D reconstructed model to demonstrate the decomposition method.

VR技术联合CBL教学在急诊住院医师规范化培训教学中的探索应用

目的 探讨虚拟现实(VR)技术联合基于案例的学习(CBL)在急诊教学中的应用效果。方法 选取2020年9月至2022年9月台州市第一人民医院40例规范化培训医师作为研究对象,采用随机数字表法将其分为实验组和传统组,每组20名。传统组采用情景模拟+讲授式教学,实验组采用VR技术联合CBL教学。比较两组理论、技能成绩及教学满意度的差异。结果 培训后,实验组学员的理论及操作考试成绩均高于传统组,差异均有统计学意义(t分别=2.58、2.38,P均<0.05)。在学习的主动性、培训模式的新颖性、提升学习效率、提升理论知识的理解、提升临床技能、加强临床思维、培训总体的满意度方面,实验组的教学满意度均高于传统组,差异均有统计学意义(t分别=3.13、3.33、2.25、2.73、2.27、2.37、2.96,P均<0.05)。实验组学员对VR课程的评分明显高于持中立态度的分值,差异有统计学意义(t=23.17,P<0.05)。结论 VR技术联合CBL教学法在急诊住院医师规范化培训教学中可以取得良好的教学效果和教学满意度,为医学教育提供了新的方法和途径。

基于模板知识库的智能变电站虚回路校核系统

构建基于模板知识库的智能变电站虚回路校核系统,建立SCD文件解析知识库,建立虚回路基本知识库(存储基本的虚回路关联关系),生成不同电压等级及接线方式的虚回路标准模板知识库。系统获得变电站归档发布的SCD文件后,通过SCD解析知识库解析SCD文件生成一二次数据模型,智能关联相匹配的标准模板知识库,根据标准模板知识库对SCD进行校核,生成虚回路校验报告,交给SCD集成商整改。该系统在重庆市电力公司得到应用并取得了良好的效果。

虚拟仿真基地粮食工程专业课程教学的建设分析

粮食安全直接关乎国家安全和社会稳定,是经济高速发展、群众安居乐业的基石。粮食领域高质量发展亟需复合创新型应用人才培养输出,新工科背景下粮食工程专业课程教学与实践创新势在必行。文章深度分析高校粮食工程专业实践现有模式存在的问题,以期在建立虚拟仿真基地方面创新。结合新工科理念下工程教育要求,探索应用型粮食工程专业虚拟仿真的创新模式,分析虚拟仿真基地构建的必要性,为地方高校粮食工程专业的创新发展与人才实践提供思路。

中医临床思维决策虚拟仿真实训平台的构建及应用

目的构建并应用中医临床思维决策虚拟仿真实训平台,探讨临床真实典型案例式虚拟仿真在线训练对学生中医临床思辨能力的影响,为中医数字化教育提供新途径。方法运用自主构建的中医临床思维决策虚拟仿真实训平台,引导学生自主训练,并进行过程性评价和终结性评价。结果经过不同临床案例和反复多次有效的模拟训练,能够在一定程度上规范学生的问诊思路,学生平均练习成绩为(57.79±5.19)分、平均考试成绩为(69.70±7.40)分,各模块考试成绩较平时练习成绩均有提升。结论基于中医临床思维决策虚拟仿真实训平台的模拟训练可以明显提高学生对常见病、多发病的中医辨证思辨能力、培养其中医临床决策能力,有助于中医人才的岗位胜任力的提升。

数字孪生技术驱动下高职土木建筑类专业虚拟仿真实训基地建设研究

虚拟仿真实训教学工作的开展,可有效解决高职土木建筑类专业部分实训因体量大、成本高、不易复制等导致学生难以实现全程体验的问题。基于数字孪生技术的高职土木建筑类专业虚拟仿真实训基地建设,可充分弥补实践教学设施方面的缺陷,提升实物模型无法达成的教学价值,对高职土木建筑类专业高素质技术技能人才的输出价值巨大。

基于VR的BOPPPS联合WPBL教学模式在《呼吸内科学》教学中的应用

目的:探讨基于VR的BOPPPS联合基于问题的教学法(Web problem-based learning,WPBL)教学模式在《呼吸内科学》教学中的应用效果。方法:选取我院2019级临床医学专业已完成基础医学课程的本科生参与研究,随机分为试验组和对照组,各40人。试验组采用基于VR的BOPPPS联合WPBL教学模式,对照组采用传统带教模式,比较2组学生理论考核成绩、教学效果和教学满意度的差异,并对教学效果评价、教学满意度与理论考核成绩进行Spearman相关性分析。结果:试验组学生的理论考核成绩[(85.8±4.9)分vs(77.2±5.3)分]、教学效果及教学满意度均优于对照组,差异均有统计学意义(P<0.05)。Spearman相关性分析提示对照组和试验组教学效果评价与理论考核成绩无显著相关性,但教学满意度和理论考核成绩显著相关(P<0.05)。进一步多元线性回归分析提示教学分组、教学效果评价和教学满意度解释了理论考核成绩60.7%的变异。结论:基于VR的BOPPPS联合WPBL教学模式应用于《呼吸内科学》教学中可有效提高教学效果和满意度。

互联网+时代新医科临床血液学检验技术虚拟仿真案例式实验教学案例库的构建与实践研究

案例教学法是高校教学改革的重要手段,互联网+时代新医科临床血液学检验技术虚拟仿真案例式实验教学案例库资源匮乏,因此构建案例库迫在眉睫。案例库建设能满足多元化教学及教学改革的需求,对优化课程体系、改革教学模式、创建一流本科课程及培养能适应现代医学发展的复合型、创新型、应用型医学检验技术专业人才具有重要意义。

虚拟仿真实训基地成果积分管理系统设计

职业教育院校所采取的成果积分管理机制,对高质量推进示范性虚拟仿真实训基地建设、激励标志性成果取得具有重要意义。基地建设内涵丰富,成果管理信息系统面向教学、实训、培训、科研、竞赛、科普等多个领域的成果,面临不同等级与人员积分分配规则的难题。针对这一问题,通过对系统需求的详细分析,构建了职业教育示范性虚拟仿真实训基地成果积分管理系统的总体功能架构与业务逻辑,详细设计了系统的底层数据结构与字段约束,完成了系统主要界面的设计,为系统实现提供参考。

铁道车辆技术虚拟仿真实训基地创新平台建设研究

按照“校企协同育人、理实虚用融合”的建设思路,以企业运用维修过程的技术链为主脉络,基于“虚拟+真实”,结合原有铁道车辆真实实训项目,建设具有智慧性、可发展性、可实践性的铁道车辆技术虚拟仿真实训基地创新平台,完善了铁道车辆专业群的数字化、虚拟仿真教学内容,为职业院校虚拟仿真实训基地建设提供可行性依据。

OBE理念下电工电子技术基础课程实验设计探索——以“星-三角转换器项目”为例

基于成果导向的人才培养需要相关课程教学方法的改进。针对电工电子技术基础课程实验设计了虚拟仿真操作方式,能够有效解决学生独立完成实验的问题,客观反映同学对相关知识的掌握和运用能力,有助于教师对教学方法的进一步改进。

以项目为导向的虚拟仿真教学案例研究

针对当前高校人才与未来人工智能+社会下的需求不匹配的问题,文中以项目为导向,从基础层-应用层-能力层3个层面分析了学生在项目中所获得的能力,以“虚拟仿真器的设计”为案例,分别阐述了在基础层的知识构建,在应用层的能力发掘以及在能力层对人工智能的超越和共存。结果表明,学生的三重能力指标获得了大幅提高。通过案例总结,以期为人工智能+时代的人才培养提供可靠案例。