Design of Fin-propeller Test Set-up and Analysis of Roll Stabilization Ability

Presents the fin-propeller test set-up to solve the problem of roll stabilization with ships in full speed range, withwhich, tests were run in water rank for acquisition of data, and concludes from data acquired that the fin-propeller test set-up produces more lift than simple fin, and provides lateral thrust as well, and it is therefore an effective roll stabilization devicefor ships in full speed range.

A Study on Unified Testing Method for IEC 61850 Based Server with Focus on Setting Group Function

The digital substation system consists of an Intelligent Electronic Device (IED) which requires information for the supervision, protection, and control, as well as a client operating system for substation operation. IEC 61850 communication standard has been defined for information exchange between heterogeneous digital devices in such substations. Currently, the Korea Electric Power Corporation (KEPCO) digital substation system uses unbuffered reporting and Generic Object Oriented Substation Events (GOOSE) communication functions for monitoring, protection and control automation. However, it is expected that the Setting Group function will be needed to operate adaptive intelligent substation system. The Setting Group function is advantageous in that it is possible to change the setting of the IED in one unified way through the client operating system, rather than changing the correction value of an IED through different manufacturer-based engineering tools. In order to utilize the Setting Group function of the IED in real substation scenario, it is necessary to test both the communication function with the host operating device and the electric functional test to ensure that correction value is properly changed. In this paper, we introduce the IEC 61850 Setting Group function, and propose a method that can integrate communication function and electrical function test of an IED conforming to the setting group functionality. We also tested the Setting Group function of the actual IED device through the proposed integrated functional test method and analyzed the results. We were able to simplify the process of testing both the electrical and communication signals in digital substations.

Analyzing and Seeking Minimum Test Instruction Set of Digital Signal Processor for Motor Control

The relativity of instructions of motor control digital signal processor (MCDSP) in the design is analyzed. A method for obtaining a minimum instruction set in plac e of the complete instruction set during generation of testing procedures is giv en in terms of the processor presentation matrix between micro-operators and in structions of MCDSP.

A Hybrid Simulation Test Platform for Verifying the Protection Settings of SPS

To verify the effectiveness and correctness of the protection settings in ring structure Shipboard Power System (SPS), a digital-physical hybrid simulation platform at China Ship Development and Design Center (CSDDC) has been built, which aims to give double verification effect of design scheme and physical device. The platform consists of eMEGAsim digital simulator, signal power amplifiers and digital-analog interface equipments. With this platform, the multiple protection device of ring structure grid can be accessed to form a close-loop test system. Since eMEGAsim model-simulated faults and actual protection device actions are on real time, the tripping settings of each device as well as their coordinate performance between multiple devices can be verified in this close-loop test.

Constructing Test Suites for k-n Softw are System

In software testing, many troublesome faults are caused by interaction of input parameters. If automatic efficient test-case generator（AETG）, in parameter order（IPO） or orthogonal Latin square is used in the software system under test, the whole test set cannot be run completely due to time or budget constraints. In this paper, according to the number of parameter k and their values n, a software system under test can be divided into four types. As for k-2 system, an algorithm was proposed to construct test rases, based on the longitudinal binary string set and method of controlling variables. As for k-n valued parameters whose n was a prime or power of prime, a method of covering array of test sets was designed to construct test sets by taking orthogonal array and derive arrays from orthogonal array and two useful conditions. As for k parameters whose n-value was not all equal, an experience algorithm was presented in this paper. The experimental results show that the size of test sets from the proposed methods is better than that from AETG, IPO, and orthogonal Latin square.

基于TestStand的TPS开发设计

阐述了自动测试系统(ATS)在电子设备测试维修领域的重要性和发展趋势,介绍了测试程序集(TPS)在ATS中的重要性。描述了TPS和通用检测平台的组成及功能。以视频输出设备为例,在分析其测试需求的基础上设计了被测单元接口适配器(TUA),并采用TestStand与VC++相结合的方式设计了测试程序(TP)。最后在实际使用中验证了TPS具有对视频输出设备功能测试和故障诊断隔离的能力。

CET-SET测试任务类型对被试词汇产出影响研究

通过分析大学英语四、六级考试口语考试(CET-SET)全程录像所得的语料调查被试在不同测试任务下的词汇产出特点。研究旨在探索不同测试任务就流利性、词汇多样性以及词频广度三项指标对被试词汇产出的影响。研究还将显著性指标与总成绩做相关分析来进一步探讨词汇产出指标对总成绩的影响。最后,研究者依据研究结果就提升词汇产出水平方面提出了几点口语测试任务类型开发及口语教学的拙见。

SET对大鼠生育力与早期胚胎发育毒性的研究

目的评价SET对SD大鼠生育力及早期胚胎发育毒性的作用.方法将160只SD大鼠(雌雄各半)随机分为溶媒对照组和SET0.125、0.25、0.5g/kg的3个剂量组.雄、雌鼠分别连续给药8周,2周后按1:1合笼,共交配5d,交配期间每日清晨进行阴道涂片检查有无精子,查到精子当天记为妊娠第0d;雄鼠给药至交配成功后处死,雌鼠给药至妊娠第6d,于妊娠第15d处死,进行生育力及早期胚胎发育毒性相关指标的检测.结果试验期间各组动物体重增长,进食量正常;动物交配、生育能力及早期胚胎发育未见明显异常,组间比较无统计学意义(P>0.05).结论批号为20051101的SET,在本试验剂量范围(0.125、0.25、0.5g/kg)对SD大鼠生育力及早期胚胎发育未见明显毒性作用.

The structure-based multi-fault test generation algorithm for combinational circuit

In this paper the structure-based test generation algorithm has been studied for the problem that test patterns are obtained by determined finite faults set in the past. This Algorithm can find out all test patterns one tithe, so faults detection is very convenient. By simulation, the smallest test patterns set can be obtained and faults coverage rate is 100%.

Image segmentation by level set evolution with region consistency constraint

Image segmentation is a key and fundamental problem in image processing,computer graphics,and computer vision.Level set based method for image segmentation is used widely for its topology flexibility and proper mathematical formulation.However,poor performance of existing level set models on noisy images and weak boundary limit its application in image segmentation.In this paper,we present a region consistency constraint term to measure the regional consistency on both sides of the boundary,this term defines the boundary of the image within a range,and hence increases the stability of the level set model.The term can make existing level set models significantly improve the efficiency of the algorithms on segmenting images with noise and weak boundary.Furthermore,this constraint term can make edge-based level set model overcome the defect of sensitivity to the initial contour.The experimental results show that our algorithm is efficient for image segmentation and outperform the existing state-of-art methods regarding images with noise and weak boundary.

Research on Evacuation Path Planning Based on Improved Sparrow Search Algorithm

Reducing casualties and property losses through effective evacuation route planning has been a key focus for researchers in recent years.As part of this effort,an enhanced sparrow search algorithm(MSSA)was proposed.Firstly,the Golden Sine algorithm and a nonlinear weight factor optimization strategy were added in the discoverer position update stage of the SSA algorithm.Secondly,the Cauchy-Gaussian perturbation was applied to the optimal position of the SSA algorithm to improve its ability to jump out of local optima.Finally,the local search mechanism based on the mountain climbing method was incorporated into the local search stage of the SSA algorithm,improving its local search ability.To evaluate the effectiveness of the proposed algorithm,the Whale Algorithm,Gray Wolf Algorithm,Improved Gray Wolf Algorithm,Sparrow Search Algorithm,and MSSA Algorithm were employed to solve various test functions.The accuracy and convergence speed of each algorithm were then compared and analyzed.The results indicate that the MSSA algorithm has superior solving ability and stability compared to other algorithms.To further validate the enhanced algorithm’s capabilities for path planning,evacuation experiments were conducted using different maps featuring various obstacle types.Additionally,a multi-exit evacuation scenario was constructed according to the actual building environment of a teaching building.Both the sparrow search algorithm and MSSA algorithm were employed in the simulation experiment for multiexit evacuation path planning.The findings demonstrate that the MSSA algorithm outperforms the comparison algorithm,showcasing its greater advantages and higher application potential.

基于粗糙分析的大学英语考试质量提升路径

大学英语考试是检验大学英语教学质量和效果的有效手段。将粗糙集理论应用于大学英语考试命题,基于粗糙集的相对正域、冗余属性和属性重要度等概念,给出试题冗余性的定性判别方法,提出试题重要度的定量度量方法,建立基于粗糙分析的大学英语考试质量提升模型。实验结果表明,新型方法发现并修正了部分冗余和重要度较低的试题,有效提高了试卷命题质量,对指导大学英语教学工作、提升教学质量具有重要指导意义。

膨润土浆液及其自凝灰浆黏度微观机理研究

不同厂家生产的钠基膨润土在相同配比要求下制备的自凝灰浆黏度差别很大,其本质是材料微观组分、结构不一致。基于SEM、XRD、EDS与NMR等微观试验,对两个厂家生产的同类钠基膨润土(简称湘源土和玉龙土)及其所制自凝灰浆进行试验分析,并据此对其黏度微观机理进行研究。结果如下:湘源土和玉龙土浆液黏度具有触变性,“卡片宫”的建立与Q~4结构的生成会促使其黏度上升,剪切作用会破坏微观结构使其黏度降低;湘源土蒙脱石含量高于玉龙土的,所以其浆液黏度整体高于玉龙土浆液。搅拌与低剪切作用促进蒙脱石颗粒小片层分散,小片层分散越多,停止剪切后膨润土浆液黏度越高。对于膨润土所制自凝灰浆,其黏度的变化主要依赖于内部电荷吸附与水化反应的程度,水化反应生成的C-S-H凝胶会促进浆液黏度提高。自凝灰浆在凝结过程中生成的碳硫硅酸钙不利于C-S-H凝胶生成,湘源土自凝灰浆碳硫硅酸钙含量高于玉龙土自凝灰浆的,所以其整体黏度低于玉龙土自凝灰浆的。

基于Gem5的CM3仿真器的研究与实现

在嵌入式领域,业界主要使用ARM公司Keil系列仿真工具进行ARM嵌入式系统开发,芯片仿真是其重要功能之一。然而ARM Keil是国外商业软件,购买License价格不菲,且仿真器也是影响芯片验证和软件开发的关键技术之一。针对上述情况,以Cortex-M3芯片为例设计了一种基于开源模拟器Gem5的系统调用仿真方法。首先,分析Gem5模拟器的源码结构、运行过程以及指令集仿真流程,描述Gem5仿真原理。然后,通过为Gem5添加Cortex-M3寄存器和指令集支持实现Cortex-M3在Atomic SimpleCPU的SE(System Emulation)模式下的仿真。最后,设计了灵活可扩展的指令集自动化测试工具,以验证指令功能是否正确仿真。实验结果表明,经过充分测试实现的仿真器能够正确仿真,且仿真效率较高,提供了一种开源、技术可控的Cortex-M3的软仿真方案。

Computer Administering of the Psychological Investigations: Set-Relational Representation

Computer administering of a psychological investigation is the computer representation of the entire procedure of psychological assessments—test construction, test implementation, results evaluation, storage and maintenance of the developed database, its statistical processing, analysis and interpretation. A mathematical description of psychological assessment with the aid of personality tests is discussed in this article. The set theory and the relational algebra are used in this description. A relational model of data, needed to design a computer system for automation of certain psychological assessments is given. Some finite sets and relation on them, which are necessary for creating a personality psychological test, are described. The described model could be used to develop real software for computer administering of any psychological test and there is full automation of the whole process: test construction, test implementation, result evaluation, storage of the developed database, statistical implementation, analysis and interpretation. A software project for computer administering personality psychological tests is suggested.

人类免疫缺陷病毒抗体初筛阳性确证结果分析及化学发光法检测抗体吸光度值/临界值灰区范围的合理性探究

目的分析人类免疫缺陷病毒(HIV)抗体初筛阳性确证结果及化学发光法检测抗体吸光度值/临界值(S/CO值)灰区范围的合理性。方法收集184例HIV抗体筛查阳性标本。采用免疫印迹法(WB)及病毒核酸测定法进行确证,观察确证结果及条带分布。采用受试者工作特征(ROC)曲线预测最佳临界值,分析HIV抗体S/CO值灰区设置的合理性。结果184例HIV抗体筛查阳性标本中,经化学发光法初筛153例(83.15%),经胶体金法初筛31例(16.85%)。男性(57.07%)、年龄在40岁以上(75.00%)的HIV抗体初筛阳性病例占比高于女性及其他年龄段病例。WB补充试验发现,共101例(54.89%)病例确证为HIV-1抗体阳性,56例(30.43%)病例确证为HIV-1抗体阴性,27例(14.67%)病例为HIV-1抗体不确定。27例中,1例经核酸检测为阳性(化学发光法初筛抗体S/CO值:5.60),其余26例为阴性。化学发光法、胶体金法与WB补充试验的阳性符合率分别为65.36%、3.23%,差异有统计学意义(χ^(2)=40.191,P<0.05)。27例HIV-1抗体不确定病例经核酸检测载量发现,1例病例WB带型为P24+gp160,核酸检测该病例为阳性。不确定样本带型分布中,P24出现率最高(74.07%),其后依次是P66(11.11%)、gp160(7.41%)和P17(3.70%)、gp41(3.70%)。ROC曲线预测HIV抗体S/CO最佳临界值为5.15,曲线下面积(AUC)为0.904,敏感度与特异度分别为83.30%、76.40%,95%CI为0.861~0.948。HIV抗体初筛阳性病例的WB检测带型与确证结果之间具有较好相关性(P<0.05),其中P24带型与确证结果之间的相关性最高(r=0.910)。结论HIV抗体初筛阳性病例中存在一定的假阳性,采用WB实验能进行有效排查。此外,基于本实验检测平台设置化学发光法检测HIV抗体S/CO值灰区范围为1.00~5.15,其具有较高的敏感度。

语言测试标准设定研究现状与展望

本文首先简要梳理标准设定的背景,接着介绍接受型和产出型考试常用的标准设定方法以及选择方法时应考虑的因素,随后重点讨论标准设定过程中普遍存在的若干挑战,如标准设定的信度和效度问题,以及认知诊断测试、专门用途英语测试和综合型语言测试标准设定中存在的问题,并据此探讨未来的研究方向,以期对研究者有所启迪。

基于高隔振指标要求的船舶泵组区域隔振模块设计研究

为满足某静音型船舶对于机舱泵组的隔振指标及布置空间的高要求,该文利用区域隔振模块设备间布置紧凑、空间利用率高、隔振效果好等优点,开展该船机舱泵组区域隔振模块的设计研究。从区域隔振模块总体布置、有限元建模、中间筏架模态分析、模块模态分析、模块静力学分析、模块谐响应分析等方面入手,建立了高隔振性能区域隔振模块的设计计算分析流程,完成了该型区域隔振模块的设计及隔振指标计算评估,并对其隔振性能进行测试。结果表明,该型区域隔振模块的隔振性能可满足此类静音型船舶对于机舱泵组高隔振指标的设计要求。

基于YOLO-OpenMax的水声通信信号开集识别方法

水声通信信号调制方式随着技术进步从典型的传统调制方式发展为水声通信机厂商私有开发的新型调制方式,这使得现有的水声通信信号闭集调制识别技术实用性受到制约,但现阶段鲜有研究基于深度学习的水声通信信号调制方式的开集识别方法。针对此现状,提出一种基于YOLO图像检测识别网络和OpenMax模型的开集识别方法。利用YOLOv5网络的输出特点,将传统OpenMax模型的处理方法进行改进,提出一种两步测试方法,实现了在多径信道下的水声通信信号的开集识别。仿真实验表明:在归一化系数为0.5,信噪比等于10 dB条件下的归一化开集识别准确率达到90%以上,实测数据同样验证了本文方法的有效性。

一次性使用输液器与喜炎平注射液药物相容性研究

目的研究一次性使用输液器与喜炎平注射液药物相容性试验。方法参照临床上喜炎平注射液临床用法用量,模拟静脉输注药液,收集不同输液器接触下的各个时间点药液,研究药液性状、主药浓度、不溶性微粒以及药液中增塑剂邻苯二甲酸二乙基乙酯(DEHP)与偏苯三酸三辛酯(TOTM)的迁移量。结果喜炎平注射液分别与不同材质的输液器、不同厂家的PVC材质输液器在输液接触过程中,输液器对药物吸附、药液性状、不溶性微粒无明显影响,在各个时间点的药液中均未检出增塑剂DEHP与TOTM。结论一次性输液器对喜炎平注射液几乎无吸附,两者具有良好的相容性。