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| 1 | An virtual numerical experiment to understand the impacts of recovering natural vegetation on the summer climate and environmental conditions in East Asia显示文摘By applying a regional integrated environmental model system (RIEMS), a virtual numerical experiment is implemented to study the impacts of recovering natural vegetation on the regional climate and environmental conditions. The results show that recovering the natural vegetation in large scale could have significant influence on summer climate in East Asia. Not only would it be able to change the surface climate, but also to modify to certain extent the intensity of monsoon circulation. Although this is a virtual experiment at an extremely ideal condition, the implication of the simulating results is that the on-going nation-wide activities to recover the crop land for forest and pasture must be managed according to the local natural climate, hydrological and soil conditions. Only under such a condition, would the recovering of natural vegetation bring about significant climate and environmental benefits at regional scale. | Congbin Fu Huiling Yuan | 2001 | Chinese Science Bulletin2001，46，14： | 30 |
| 2 | 多旋翼无人机在工程方量测绘中的应用显示文摘多旋翼无人机作为一种低成本、高精度、操作简便的遥感影像获取平台,在传统测绘测量、数字城市建设、灾害应急处理等方面的应用取得了良好的成果。本文以拓普康猎鹰8号八旋翼无人机平台为例,通过分析该平台获取的低空摄影测量数据,利用Virtual Surveyor软件进行两期间工程方量的计算,为工程管理提供了准确的数据和有力的技术保障。 | 高利敏 冯耀楼 | 2018 | 测绘通报2018，，4： | 30 |
| 3 | Application and Prospect of Mixed Reality Technology in Medical Field显示文摘Mixed reality(MR)technology is a new digital holographic image technology,which appears in the field of graphics after virtual reality(VR)and augmented reality(AR)technology,a new interdisciplinary frontier.As a new generation of technology,MR has attracted great attention of clinicians in recent years.The emergence of MR will bring about revolutionary changes in medical education training,medical research,medical communication,and clinical treatment.At present,MR technology has become the popular frontline information technology for medical applications.With the popularization of digital technology in the medical field,the development prospects of MR are inestimable.The purpose of this review article is to introduce the application of MR technology in the medical field and prospect its trend in the future. | Hong-zhi HU Xiao-bo FENG Zeng-wu SHAO Mao XIE Song XU Xing-huo WU Zhe-wei YE | 2019 | Current Medical Science2019，39，1： | 29 |
| 4 | 基于SNS的Living Library虚拟社区构建研究显示文摘通过对国内外Living Library的考察,结合Web2.0和社会性网络SNS的发展,提出了一个基于SNS的Living Library虚拟社区模型:Virtual Living Library(简称VLL),并就VLL的概念模型的构建、实践和评价等方面进行了论述,讨论了VLL的建设可能性和发展前景。 | 钱国富 周群 | 2011 | 大学图书馆学报2011，29，2： | 28 |
| 5 | Self-tuning virtual synchronous generator control for improving frequency stability in autonomous photovoltaic-diesel microgrids显示文摘This paper investigates the use of a virtual synchronous generator(VSG) to improve frequency stability in an autonomous photovoltaic-diesel microgrid with energy storage. VSG control is designed to emulate inertial response and damping power via power injection from/to the energy storage system. The effect of a VSG with constant parameters(CP-VSG) on the system frequency is analyzed. Based on the case study, self-tuning algorithms are used to search for optimal parameters during the operation of the VSG in order to minimize the amplitude and rate of change of the frequency variations. The performances of the proposed self-tuning(ST)-VSG, the frequency droop method, and the CP-VSG are evaluated by comparing their effects on attenuating frequency variationsunder load variations. For both simulated and experimental cases, the ST-VSG was found to be more efficient than the other two methods in improving frequency stability. | Rongliang SHI Xing ZHANG Chao HU Haizhen XU Jun GU Wei CAO | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，3： | 27 |
| 6 | MEMS仿生矢量水听器封装结构的设计与研究显示文摘针对MEMS仿鱼侧线矢量水听器提出三种封装结构,即采用聚氨酯材料制成的透声帽封装结构,透声帽内衬笼状支撑体的封装结构,透声帽内衬瓣状支撑体的封装结构。采用ANSYS有限元建立三维封装模型并进行模态仿真,得出其固有频率分别为875 Hz、2 926 Hz、3 006 Hz。采用Virtual.lab acoustic进行声衰减仿真并通过试验验证最终得出:内衬支撑体的封装结构,其有效带宽响应比无支撑体的透声帽封装结构宽2.2 kHz左右,同时,实验表明瓣状支撑体的收缩瓣状部分具有聚能效应,这种封装结构的水听器灵敏度比其他两种封装结构在相同频率点处高8 dB~12 dB。 | 李振 张国军 薛晨阳 薛南 刘宏 陈桂英 | 2013 | 传感技术学报2013，26，1： | 26 |
| 7 | Novel 3-dimensional virtual hepatectomy simulation combined with real-time deformation显示文摘AIM:To develop a novel 3-dimensional(3D) virtual hepatectomy simulation software,Liversim,to visualize the real-time deformation of the liver.METHODS:We developed a novel real-time virtual hepatectomy simulation software program called Liversim. The software provides 4 basic functions:viewing 3D models from arbitrary directions,changing the colors and opacities of the models,deforming the models based on user interaction,and incising the liver parenchyma and intrahepatic vessels based on user operations. From April 2010 through 2013,99 patients underwent virtual hepatectomies that used the conventional software program SYNAPSE VINCENT preoperatively. Between April 2012 and October 2013,11 patients received virtual hepatectomies using the novel software program Liversim; these hepatectomies were performed both preoperatively and at the same that the actual hepatectomy was performed in an operating room. The perioperative outcomes were analyzed between the patients for whom SYNAPSE VINCENT was used and those for whom Liversim wasused. Furthermore,medical students and surgical residents were asked to complete questionnaires regarding the new software.RESULTS:There were no obvious discrepancies(i.e.,the emergence of branches in the portal vein or hepatic vein or the depth and direction of the resection line) between our simulation and the actual surgery during the resection process. The median operating time was 304 min(range,110 to 846) in the VINCENT group and 397 min(range,232 to 497) in the Liversim group(P = 0.30). The median amount of intraoperative bleeding was 510 m L(range,18 to 5120) in the VINCENT group and 470 m L(range,130 to 1600) in the Liversim group(P = 0.44). The median postoperative stay was 12 d(range,6 to 100) in the VINCENT group and 13 d(range,9 to 21) in the Liversim group(P = 0.36). There were no significant differences in the preoperative outcomes between the two groups. Liversim was not found to be clinically inferior to SYNAPSE VINCENT. Both students and surgical residents reported that the Liversim image was almost the same as the actual hepatectomy.CONCLUSION:Virtual hepatectomy with real-time deformation of the liver using Liversim is useful for the safe performance of hepatectomies and for surgical education. | Yukio Oshiro Hiroaki Yano Jun Mitani Sangtae Kim Jaejeong Kim Kiyoshi Fukunaga Nobuhiro Ohkohchi | 2015 | World Journal of Gastroenterology2015，21，34： | 23 |
| 8 | New advances in virtual plant research显示文摘Virtual plants are computer simulations of the growth, development and deployment of plants in a three-dimensional space. Over the past 20 years, significant progress has been made in virtual plant modeling corresponding to the rapid advances in information technology. Virtual plant research has broad applications in agronomy, forestry, ecology, and remote sensing areas. In this review, we attempt to introduce the significance, modeling methodology, and main advances in virtual plant research and applications. The challenges associated with virtual plant modeling in agronomy applications, including the interaction mechanism between plant and environment and root system modeling, are also discussed. Insights into applications of virtual plants in agronomy are given in the areas of performing virtual experiments to accurately quantify the utilization of soil water and nutrients, to design crop ideotype on computers, and to improve crop planting. | Yan Guo Baoguo Li | 2001 | Chinese Science Bulletin2001，46，11： | 21 |
| 9 | INTELLIGENT VIRTUAL CONTROL:MEASURING INSTRUMENT FROM WHOLE TO PART显示文摘A new concept called intelligent virtual control (IVC), which can be driven by measuring functions, is put forward. This small 'intelligent measurement instrument unit (IMIU)', carrying with functions of instrument, consists of different types of intelligent virtual instrument (IVI) through individual components together as building blocks and can be displayed directly on the computer screen. This is a new concept of measuring instrument, and also an important breakthrough after virtual instrument (VI). Virtual control makes instrument resources obtain further exploitation. It brings about a fundamental change to the design and manufacturing mode. The instrument therefore, can not only be produced directly inside a PC, but the product is involved in the 'green product' system. So far, all the present digital instruments will grow to be replaced by intelligent control with green characteristics. | Qin Shuren Tang BaopingCollege of Mechanical Engineering, Chongqing University, Chongqing 400044, China | 2002 | Chinese Journal of Mechanical Engineering2002，15，2： | 19 |
| 10 | Development of Simulation System for the Disaster Evacuation Based on Multi-Agent Model Using显示文摘This paper presents a simulation system for the disaster evacuation based on multi-agent model considering geographical information. This system consists of three parts, the modeling for the land and buildings using GIS data, the analysis of disaster evacuation using multi-agent model, and the visualization for the numerical results using the virtual reality technique. By introducing the numerical solver of the natural disaster to the present system, it is possible to evaluate not only the damage of structure but also the damage of human being. Furthermore, it is possible to investigate the appropriate evacuation route by the simulation. The Dijkstra algorithm is used to obtain shortest route to the refuge. In addition, the visualization using virtual reality technique is curried out to understand the feeling of refugee. The present system is applied to the evacuation analysis by the flood flow in urban area and is shown to be a useful tool to investigate the damage by natural disasters. | GISKeisuke Uno Kazuo Kashiyama | 2008 | Tsinghua Science and Technology2008，13，S1： | 15 |
| 11 | 基于虚拟现实技术的现代教育探索显示文摘虚拟现实技术是运用计算机对现实世界进行全面仿真的技术,能够解决学习媒体的情景化及自然交互性的要求,从而在现代教育领域内有着极其巨大的应用前景。本文主要探讨虚拟现实技术类型的划分,及其在现代教育领域中的应用及优势。 | 王志坚 | 2007 | 常州工程职业技术学院学报2007，0，3： | 15 |
| 12 | Modeling framework of voltage-source converters based on equivalence with synchronous generator显示文摘Along with the increasing penetration of distributed generation with voltage-source converters(VSCs),there are extensive concerns over the potential virtual rotor angle stability, which is characterized by oscillations of power and frequency during the dynamic process of synchronization in the grid. Several control strategies have been developed for VSCs to emulate rotating inertia as well as damping of oscillations. This paper classifies these strategies and provides a small-signal modeling framework including all kinds of VSCs in different applications for virtual rotor angle stability. A unified perspective based on the famous Phillips–Heffron model is established for various VSCs. Thus, the concepts of equivalent inertia and the synchronizing and damping coefficients in different VSCs are highlighted, based on the similarities with the synchronous generator(SG) system in both physical mechanisms and mathematical models. It revealed the potentiality of various VSCs to achieve equivalence with the SG. This study helps promote the unity of VSCs and traditional SGs in both theories and methods for analyzing the dynamic behavior and enhancing the stability. Finally,future research needs and new perspectives are addressed. | Shulong TAN Hua GENG Geng YANG Huai WANG Frede BLAABJERG | 2018 | Journal of Modern Power Systems and Clean Energy2018，6，6： | 15 |
| 13 | New concept and new theory of mobility calculation for multi-loop mechanisms显示文摘In 2005,Gogu,a Frenchman,analyzed 35 different existing formulas for mobility calculation and pointed that the formulas for quick mobility calculation had some limitations and were not general.Therefore,looking for a general and simple mobility formula is still a hot topic in mechanisms.At the meantime,it is also an important topic to complete the mechanism theory.Gogu proposed a new method that can avoid determining virtual constraints in 2008,but the method is still not general.To solve the problem,this paper defines the new concepts of link-group rank,general-kinematic-pair rank,virtual pair,virtual loop,and virtual-loop rank,and gives a new simple and general formula.Our method converts multi-loop mechanisms into some independent virtual loops,simplifies the problem,avoids calculating virtual constraints,and reduces the calculation difficulty.It is proved that the new formula is simple,general and effective through the mobility analysis of several different kinds of mechanisms.The application of this formula will provide great convenience for general engineers in mobility calculation. | ZHANG YiTong & MU DeJun Mechanical Engineering College of Yanshan University,Qinhuangdao 066004,China | 2010 | Science China(Technological Sciences)2010，53，6： | 12 |
| 14 | 关于“Virtual Reality”概念问题的研究综述显示文摘“VirtualReality”是近些年来科技哲学领域的热门话题之一 ,VR技术的发展和普及对马克思主义哲学的许多基本概念和基本范畴都提出了挑战。虽然学者们纷纷对其本质、内涵进行了思考 ,但观点却很不一致。本文从“VirtualReality”的译法、实质、与互联网的关系及其与“虚拟”的联系等四个方面对当前的研究现状作了分析论述。 | 康敏 | 2002 | 自然辩证法研究2002，18，2： | 12 |
| 15 | 利用集群技术构建Linux Virtual Server显示文摘在网络系统性能研究中,集群技术是提高系统综合性能的一种重要方法。在Linux操作系统平台上构建了集群Virtual Server,并详细论述了其原理和构建过程、重点描述了地址转换(NAT)、 IP隧道(IP Tunneling)和直接路由(Direct Routing)三种IP层的负载均衡办法及满足不同应用需要的四种分担算法(RR、WRR、LC和WLC)等核心过程;实践结果证明,集群技术研究是成功的;对系统性能的提高是明显的. | 沈中林 金宝鼎 扬明 | 2000 | 计算机应用研究2000，17，3： | 11 |
| 16 | 虚拟机Virtual PC在Windows网络操作系统课程教学中的应用显示文摘采用虚拟机来进行计算机辅助教学,是近年来在计算机教学领域被广泛应用的一种教学辅助方法,也是各计算机教学工作者比较热衷探讨的一个应用课题。介绍虚拟机技术及软件,重点介绍利用Virtual PC虚拟机软件进行Windows网络操作系统教学的具体应用。 | 张琴 | 2009 | 硅谷2009，2，17： | 11 |
| 17 | 虚拟机在计算机网络课程教学中的应用研究显示文摘在计算机网络技术课程教学中,在局域网计算机之间联网时,需要在域控制器和客户机之间频繁切换。为了方便教师进行组网技术的讲解和满足常规教学需要,学校多媒体教室管理员通常的做法是在多媒体教室中的计算机上安装Windows Server 2003服务器和Windows XP双操作系统,以便各取所需。但这样做仍然存在诸多问题。文章介绍了一种用虚拟机技术解决这些问题的方法,该方法简单、容易实现,且具有经济、实用、灵活和易于扩展的特点,值得推广。 | 林雄 林元乖 杜岩 | 2010 | 计算机时代2010，，5： | 11 |
| 18 | Technical and conceptual considerations forusing animated stimuli in studies of animalbehavior显示文摘Rapid technical advances in the field of computeropened new avenues in animal behavior research.animation (CA) and virtual reality (VR) haveAnimated stimuli are powerful tools as theyoffer standardization, repeatability, and complete control over the stimulus presented, thereby"reducing" and "replacing" the animals used, and "refining" the experimental design in line withthe 3Rs. However, appropriate use of these technologies raises conceptual and technical questions.In this review, we offer guidelines for common technical and conceptual considerations related tothe use of animated stimuli in animal behavior research. Following the steps required to create ananimated stimulus, we discuss (I) the creation, (11) the presentation, and (111) the validation of CAsand VRs. Although our review is geared toward computer-graphically designed stimuli, consider-ations on presentation and validation also apply to video playbacks. CA and VR allow both new be-havioral questions to be addressed and existing questions to be addressed in new ways, thus weexpect a rich future for these methods in both ultimate and proximate studies of animal behavior. | Laura CHOUINARD-THULY Stefanie GIERSZEWSKI Gil G. ROSENTHAL Simon M. READER Guillaume RIEUCAU Kevin L. Woo Robert GERLAI Cynthia TEDORE Spencer J. INGLEY John R. STOWERS Joachim G.FROMMENI Francine L. DOLINS Klaudia WITTE | 2017 | Current Zoology2017，63，1： | 10 |
| 19 | Multi-source geospatial information integration and sharing in Virtual Globes显示文摘Massive volumes of global geospatial information are being collected by newly designed acquisition devices and generated by various geospatial applications.This poses a critical challenge to efficiently organize and effectively integrate global multi-source geospatial information.This paper introduces a global seamless data model for the organization of huge multi-source,multi-resolution and multi-temporal geospatial data.Based on this data model,the management of the global multi-resolution pyramid is discussed in detail.To integrate geospatial data and processing functions from various GIS systems,a service-oriented framework is presented through the technology of Virtual Globe.Finally,a Virtual Globe system,GeoGlobe,is developed and illustrated. | GONG JianYa,XIANG LongGang,CHEN Jing & YUE Peng State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430072,China | 2010 | Science China(Technological Sciences)2010，53，S1： | 10 |
| 20 | A Single-Site Positioning Method Based on TOA and DOA Estimation Using Virtual Stations in NLOS Environment显示文摘This paper presents a single-site positioning method based on the joint estimation of propagation time-of-arrival(TOA) and direction-of-arrival(DOA), with the assist of virtual stations in the typical non-line-of-sight(NLOS) environment. Consider the influence of multipath noise on the positioning performance, the proposed method firstly presents a modified high-resolution estimation technique called Multipath noise Limiting Matrix Pencil(MLMP) algorithm to achieve the TOA/DOA estimations, in which the matrix pencil and matrix enhancement process are implemented to deal with the measurements from the uniform linear array(ULA) receiver. Meanwhile, the subspace dimension estimation is improved via an adaptive threshold, for enhancing the performance of high-resolution techniques in low signal-noise-ration(SNR) situation. Next the proposed method generates virtual stations utilizing the known floor plan of surrounding reflectors, and adopts a weighted Least Square(WLS) position estimator to calculate the required position, combining the TOA/DOA estimations with the location of virtual stations. Simulations are conducted to evaluate the proposed method under NLOSconditions, and the results show that comparing with the multipath fingerprinting scheme, the proposed method has better performance in various simulation scenarios. | Rui Zhang Weiwei Xia Feng Yan Lianfeng Shen | 2019 | China Communications2019，16，2： | 9 |
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