Topology and Position Aware Overlay Network Construction Protocol for Augmentation Information of Satellite Navigation System

It is an effective method to broadcast the augmentation information of satellite navigation system using GEO technology.However,it becomes difficult to receive GEO signal in some special situation,for example in cities or canyons,in which the signal will be sheltered by big buildings or mountains.In order to solve this problem,an Internet-based broadcast network has been proposed to utilize the infrastructure of the Internet to broadcast the augmentation information of satellite navigation system,which is based on application-layer multicast protocols.In this paper,a topology and position aware overlay network construction protocol is proposed to build the network for augmentation information of satellite navigation system.Simulation results show that the new algorithm is able to achieve better performance in terms of delay,depth and degree utilization.

A Fusion Localization Method Based on Target Measurement Error Feature Complementarity and Its Application

In the multi-radar networking system,aiming at the problem of locating long-distance targets synergistically with difficulty and low accuracy,a dual-station joint positioning method based on the target measurement error feature complementarity is proposed.For dual-station joint positioning,by constructing the target positioning error distribution model and using the complementarity of spatial measurement errors of the same long-distance target,the area with high probability of target existence can be obtained.Then,based on the target distance information,the midpoint of the intersection between the target positioning sphere and the positioning tangent plane can be solved to acquire the target's optimal positioning result.The simulation demonstrates that this method greatly improves the positioning accuracy of target in azimuth direction.Compared with the traditional the dynamic weighted fusion(DWF)algorithm and the filter-based dynamic weighted fusion(FBDWF)algorithm,it not only effectively eliminates the influence of systematic error in the azimuth direction,but also has low computational complexity.Furthermore,for the application scenarios of multi-radar collaborative positioning and multi-sensor data compression filtering in centralized information fusion,it is recommended that using radar with higher ranging accuracy and the lengths of baseline between radars are 20–100 km.

Robust Position Observer for Sensorless Direct Voltage Control of Stand-Alone Ship Shaft Brushless Doubly-Fed Induction Generators

The aim of this paper is to investigate an adaptive sensorless direct voltage control(DVC)strategy for the stand-alone ship shaft brushless doubly-fed induction generators(BDFIGs).The proposed new rotor position observer using the space vector flux relations of BDFIG may achieve the desired voltage control of the power winding(PW)in terms of magnitude and frequency,without any speed/position sensors.The proposed algorithm does not require any additional observers for obtaining the generator speed.The proposed technique can directly achieve the desired DVC based on the estimated rotor position,which may reduce the overall system cost.The stability analysis of the proposed observer is investigated and confirmed with the concept of quadratic Lyapunov function and using the multi-model representation.In addition,the sensitivity analysis of the presented method is confirmed under different issues of parameter uncertainties.Comprehensive results from both simulation and experiments are realized with a prototype wound-rotor BDFIG,which demonstrate the capability and efficacy of the proposed sensorless DVC strategy with good transient behavior under different operating conditions.Furthermore,the analysis confirms the robustness of the proposed observer via the machine parameter changes.

Application of precise point positioning technology in airborne gravity measurement

The precise point positioning （PPP） technology is applied to an airborne gravity survey. By analyzing the advantages and disadvantages of several velocity and acceleration measurement methods and in combination with an actual marine gravity survey, the position difference method is confirmed to be a useful survey method for velocity and acceleration. Finally, the practicability of using PPP in airborne marine gravity survey is verified by measured data.

Advances in the Clinical Application of Trendelenburg Position

The Trendelenburg position and reverse Trendelenburg position are frequently employed during lower abdominal surgery to achieve optimal surgical field visualization and complete exposure of the operative site, particularly under pneumoperitoneum conditions. However, these positions can have significant impacts on the patient’s physiological functions. This article overviews the historical background of Trendelenburg position and reverse Trendelenbury position, their effects on various physiological functions, recent advancements in their clinical applications, and strategies for preventing and managing associated complications.

Status and application of human resource management in the enterprise management

With the overall socio-economic development in the continuing process, companies occupy an important position in it. Labor is the subject of an enterprise, in which it plays an important role, so the human resource occupies a major position in enterprise.This paper describes the human resources management in the enterprise as well as the status of the position and role of human resources management in the enterprise. There is objective analysis of the current status quo and prospect enterprise human resource management, and it plays an important role in the development of enterprises.

透视Protection and Control of Modern Power Systems期刊国际化之路探索如何创办国际期刊

以Protection and Control of Modern Power Systems(PCMP,《现代电力系统保护与控制》)期刊为例,阐述如何依托优势学科选择期刊的定位,充分发挥编委和编辑的作用,借助国外成熟的专业化出版平台,学习国外的先进办刊理念、发行渠道搭建经验、国际宣传策略,使期刊快速地走向国际化;以申请SCIE(Science Citation Index Expand)数据库并被正式收录为例,分析了申请加入SCIE过程中值得期刊社关注的事项。

Positioning planning of high-intensity-focused ultrasound surgery platform using Bezier curve

A positioning volume ellipsoid method is proposed to represent tumor volume in the workspace of a high-intensity-focused ultrasound (HIFU) surgery platform during the platform's positioning motion. To this simplified tumor model, a nearest neighbor search method is used to determine intermediate configuration and goal configuration, which the treatment head and ultrasound focus must pass in their localization to target volume. Based on the decided configurations, the continuity condition of combined Bezier curve in Euclidean space and De Casteljau algorithm on Lie group SO(3) are integrated to construct a combined Bezier positioning path of C2 continuity at junctional configuration, and an illustration of different positioning path planning is analyzed based on a liver tumor case.

Construction Strategy and Affecting Factors of Positive-Strand RNA Virus Infectious Clone

Construction of infectious clones by full-length cDNA is basic and key for recovering RNA virus and is core of reverse genetics.In this article,basic consideration and key technology were viewed and factors affecting infectivity of clones were also summarized.Some research advances were briefly introduced about positive-strand RNA viruses infectious clones.Finally,this article also reviewed the application of infectious clones.

云端结合的Android智能终端应用审计技术

Android智能终端的蓬勃发展和快速普及,促进了互联网的繁荣,极大地改变了人类社会的运作方式,也给互联网的黑产经济带来了新的有利条件。从典型高级恶意程序的行为特征出发,分析了引入网络审计方法的必要性等,并提出了基于网络行为分析的智能终端应用审计技术实施方案,包括数据采集方案、审计流程和审计策略管理。

False Positives Caused by Single Primer in DDRT Analysis of Soybean

[Objective] The aim was to explore the reasons of false positives in Different Display Reverse Transcription（DDRT）analysis.[Method] Soybean varieties ＂Jilin 30＂ and ＂Tongnong 13＂ were used as materials to carry out analysis on false positives in DDRT analysis.[Result] An important origin of false positives appeared in DDRT analysis was the non-specific amplification caused by the combination of single primer and cDNA.The parallel PCR test of single primer should be set so as to verify whether the obtained fragments were the false positives or the PCR productions combined with single primer.[Conclusion] This study had provided basis for improving the success rate of DDRT experiment.

基于质谱的脂质C=C和脂肪酰基位置鉴定方法及其在食品分析中的应用研究进展

脂质在生命体中发挥着重要作用,结构影响功能,脂质精细结构解析至关重要。但脂质结构的多样性和相似性对脂质分析提出了巨大挑战。质谱是脂质分析的重要技术之一,在脂质C=C和脂肪酰基位置结构解析中有着较好的应用。本文介绍脂质分析的前处理方法,综述基于质谱的C=C位置和脂肪酰基位置鉴定方法,并讨论该方法在食品分析中的应用,最后展望质谱在脂质化合物精确结构解析方面的发展趋势,以期为不饱和脂质C=C位置和脂肪酰基位置鉴定以及异构体识别和定量分析技术发展和应用提供参考。

基于APK签名信息反馈的Android恶意应用检测

提出一种新的基于APK签名信息反馈的Android恶意应用检测方法(SigFeedback)。该方法在SVM分类算法的基础上采用启发式规则学习的方式对特征值进行提取,并对检测集中的APK签名信息进行验证筛选,实现了启发式反馈,达到更加准确地检测恶意应用的目的。SigFeedback检测算法具有检测率高、误报率低的特点。最后通过实验显示SigFeedback算法具有较高的效率,且能使误报率从13%降低到3%。

基于Android的拼车应用设计与实现

针对目前主流拼车软件(滴滴出行、曹操出行等)根据用户发布的拼车时间、出发地和目的地等信息匹配拼车伙伴成功率低的现状,提出了设计“车拼拼”应用程序(APP),将路线分析与拼车有效结合,绕开第三方司机,实现拼车前拼车伙伴的相互联络以促使车费均摊,减少个人支出。首先,通过百度地图应用程序接口(API)解析路线信息,并利用Bmob后端云存储路线数据;然后,在Android平台利用嵌套算法对路线数据进行比较分析;最终,以APP的形式展示结果。该APP拥有地图浏览、自身定位、兴趣点(POI)检索、路线规划等多项功能,采用多层嵌套分析比较路线的方式为用户寻找拼车伙伴,匹配程度较高。测试结果表明,所设计系统可以稳定运行,用户匹配成功率100%,用户拼车的平均等待时间为10.52 s。“车拼拼”APP可以为用户轻松地寻找到理想的拼车伙伴。

Benchmarking Approach to Compare Web Applications Static Analysis Tools Detecting OWASP Top Ten Security Vulnerabilities

To detect security vulnerabilities in a web application,the security analyst must choose the best performance Security Analysis Static Tool(SAST)in terms of discovering the greatest number of security vulnerabilities as possible.To compare static analysis tools for web applications,an adapted benchmark to the vulnerability categories included in the known standard Open Web Application Security Project(OWASP)Top Ten project is required.The information of the security effectiveness of a commercial static analysis tool is not usually a publicly accessible research and the state of the art on static security tool analyzers shows that the different design and implementation of those tools has different effectiveness rates in terms of security performance.Given the significant cost of commercial tools,this paper studies the performance of seven static tools using a new methodology proposal and a new benchmark designed for vulnerability categories included in the known standard OWASP Top Ten project.Thus,the practitioners will have more precise information to select the best tool using a benchmark adapted to the last versions of OWASP Top Ten project.The results of this work have been obtaining using widely acceptable metrics to classify them according to three different degree of web application criticality.

Research on the Generation Path of Heuristic Teaching Language Based on Positive Psychology Theory

As the essence of traditional Chinese educational thought,heuristic teaching has gradually enriched and devel-oped its ideas through the continuous efforts of educational researchers of the past dynasties.In front-line teach-ing,heuristic teaching,as a teaching principle that can help teachers and students to interact and learn,undoubtedly plays an important role in students’acquisition of knowledge and scientific thinking activities.But teachers’understanding of heuristic teaching is not the same.In actual teaching,there are obvious gaps in language ability among different teachers.This research aims to enrich the heuristic teaching theory based on the perspective of psychology,and provide a certain theoretical basis for teacher training.Through the research and analysis of the generation path of the heuristic teaching language,this paper helps more teachers realize the advantages of the heuristic teaching language,improve their own heuristic teaching language level,and provide reference for the scientific teaching evaluation standard.We apply the heuristic instruction language approach proposed in this study and apply it to real classrooms.In the application,it can be clearly found that the students’thinking and participation have been strengthened,and the teaching effect has been significantly improved com-pared with the past,which indicates that the heuristic teaching language generation path in this study has certain practical application value.

Kinematic improvement after the external-application herbs combine rehabilitation in upper-limb spasticity due to stroke

Background: Spasm is one of the most serious physical impairment after stroke. the external-application herbs have showed some effects on the spasm. This study was conducted to evaluate the comparative effectiveness of the external-application herbs and physical therapy in upper limb spasticity after stroke. Methods: A total of 100 patients with upper limb spasm after stroke (stroke time less than 1 month), have been recruited in Shun-yi Hospital of Beijing Traditional Chinese Medicine Hospital. Patients will be randomly allotted to one of two groups (N = 50, respectively): the TCM external application group, and the usual rehab (conventional physical therapy and medication treatment) group. The two groups will be administered once a month for three months. The primary outcome will be Modified Athworth Scale (MAS) and the simplified scale (Fugl-Meyer assessment, FMA) for upper limb. Results: Muscle tension and motor function were evaluated before and 4 weeks after treatments. There was a significant improvement in muscle tension and motor function in patients with stroke after the external-application herbs and physical therapy (P < 0.05). Conclusion: There was a significant improvement in kinematics in patients with stroke.

Clinical study of NFNC in the treatment of acute exacerbation chronic obstructive pulmonary disease patients with respiratory failure

BACKGROUND Most patients with acute exacerbation chronic obstructive pulmonary disease(AECOPD)have respiratory failure that necessitates active correction and the improvement of oxygenation is particularly important during treatment.High flow nasal cannula(HFNC)oxygen therapy is a non-invasive respiratory aid that is widely used in the clinic that improves oxygenation state,reduces dead space ventilation and breathing effort,protects the loss of cilia in the airways,and improves patient comfort.AIM To compare HFNC and non-invasive positive pressure ventilation in the treatment of patients with AECOPD.METHODS Eighty AECOPD patients were included in the study.The patients were in the intensive care department of our hospital from October 2019 to October 2021.The patients were divided into the control and treatment groups according to the different treatment methods with 40 patients in each group.Differences in patient comfort,blood gas analysis and infection indices were analyzed between the two groups.RESULTS After treatment,symptoms including nasal,throat and chest discomfort were significantly lower in the treatment group compared to the control group on the 3rd and 5th days(P<0.05).Before treatment,the PaO_(2),PaO_(2)/FiO_(2),PaCO_(2),and SaO_(2)in the two groups of patients were not significantly different(P>0.05).After treatment,the same indicators were significantly improved in both patient groups but had improved more in the treatment group compared to the control group(P<0.05).After treatment,the white blood cell count,and the levels of C-reactive protein and calcitonin in patients in the treatment group were significantly higher compared to patients in the control group(P<0.05).CONCLUSION HFNC treatment can improve the ventilation of AECOPD patients whilst also improving patient comfort,and reducing complications.HFNC is a clinically valuable technique for the treatment of AECOPD.

基于Android智能手机的GNSS定位精度和准度分析

为更准确定位Android终端(GNSS:Global Navigation Satellite System)定位精度,使手机更好地在泛测绘场景应用,选取两个典型测点,通过48 h连续观测并采用GAMIT/GLOBK软件解算获得测点"真实"坐标。使用两款智能手机采集全球导航卫星系统原始观测数据,进行静态和动态定位精度和准确度对比实验。结果表明,三星Galaxy S8定位结果普遍优于华为P10;静态后处理,LGO(Leica Geo Office)解算结果好于RTKLIB解算结果;动态实时解,三星Galaxy S8实现固定解且具有较好的准度(优于1dm);华为P10的结果较差,准度在3.18~5.52 m之间,精度在2.67~4.88 m之间,且未实现固定解。

The Applic ation of Internal Quality Audit in ADCOP Project

Internal quality audits are a key activity in the quality management ofoil projects.Quality management aims at meeting project quality requirements,coordinatingproject progress,assisting in controlling project costs,and realizing continuousimprovement in project quality management.