Research on Modeling and Reusing of Computer Numerical Control Software with Object-oriented Technology

To improve the reusable and configurable ability of computer numerical control ( CNC ) software, a new method to construct reusable model of CNC software with object-oriented (OO) technology is proposed. Based on analyzing function of CNC software, the article presents how to construct a general class library of CNC software with OO technology. Most function modules of CNC software can he reused because of inheritable capability of classes. Besides, the article analyzes the object relational model in request/report mode, and multitask concurrent management model, which can he applied on double-CPU hardware platform and Windows 95/NT environment. Finally, the method has been successfully applied on a turning CNC system and a milling CNC system, and some function modules have been reused.

Product Family Design Methodology Using Object-Oriented Approach

The serious competition environment of global marke t requests the enterprise to change traditional product development strategy and a dopt new theory in order to meet diverse customer needs while maintaining near m ass production efficiency, which is the main philosophy of mass customization. P roduct family design is research focus at present and also is the core technolog y of DFMC (design for mass customization). Firstly, this paper explores the fund amental issues of product family, such as concepts of modularity, commonality/di versity, product platform and product family architecture etc. We compare the te rminology between product family and object-oriented approach in the next step. Thirdly, this paper puts forwards one product family design methodology based o n product platform and under different phase of product life cycle constrains, f or example, functional, assembly and service etc. At the end section of this pap er, we applied, the object-oriented approach in above mentioned product family design methodology to realize the design process. In one word, this paper propos ed one product family design methodology based on object oriented approach and p roduct life cycle consideration, especially the conjointness of characteristic o f OOA and concepts of product family. The main property of OOA are encapsulation , inherence and polymorphism. Encapsulation can represent the module or building blocks of product family. Inherence can be extended to describe the modularity and commonality, and also be used to construct variant space. Alternative specif ic of product family architecture can be embodied with polymorphism. And fin aly, we give the future work contents. In order to derive the product platform a nd achieve modularity and commonality/diversity, interface management between bu ilding block is necessary. The question is how the OOA can be applied in interfa ce management to get our aim OOA is the basis of many information management sy stem, then the question is how to build one system to manage the information of product family and support mass customization The third question is how to deve lop one computer aided tool to facilitate the application of OOA for product fam ily design, even be used to category of design for mass customization.

Quantifying Reusability of Object Oriented Design: A Testability Perspective

The quality factor of class diagram is critical because it has a significant influence on overall quality of the product, delivered finally. Testability analysis, when done early in the software creation process, is a criterion of critical importance to software quality. Reusability is an important quality factor to testability. Its early measurement in object oriented software especially at design phase, allows a design to be reapplied to a new problem without much extra effort. This research paper proposes a research framework for quantification process and does an extensive review on reusability of object oriented software. A metrics based model “Reusability Quantification of Object Oriented Design” has been proposed by establishing the relationship among design properties and reusability and justifying the correlation with the help of statistical measures. Also, “Reusability Quantification Model” is empirically validated and contextual significance of the study shows the high correlation for model acceptance. This research paper facilitates to software developers and designer, the inclusion of reusability quantification model to access and quantify software reusability for quality product.

Target-Fault-Oriented Test Generation of Sequential CircuitsUsing Genetic Algorithm

This paper deals with the target-fault-oriented test generation of sequential circuits using genetic algorithms. We adopted the concept of multiple phases and proposed four sub-procedures which consist of activation, propagation and justification phases. The paper focuses on the design of genetic operators and construction of fitness functions which are based on the structure information of circuits. Using ISCAS89 benchmarks, the experiment results of GA were given.

Towards Semantic Mutation Testing of Aspect-Oriented Programs

Aspect-oriented programs have received much attention from software testing researchers. Various testing techniques and approaches have been proposed to tackle issues and challenges when testing aspect-oriented programs including traditional mutation testing. In traditional mutation testing of aspect-oriented programs, mutants are generated by making small changes to the syntax of the aspect-oriented language. Recently, a new approach known as semantic mutation testing has been proposed. This approach mutates the semantics of the language in which the program is written. The mutants generated misunderstandings of the language which are different classes of faults. Aspect-oriented programming presents itself with different properties that can be further explored with respect to semantic mutation testing. This paper describes various possible scenarios that semantic mutation testing strategy might have particular value in testing aspect-oriented programs.

Dynamic Slicing of Object Oriented Programs

Program slice has many applications such as program debugging, testing, maintenance, and complexity measurement. A static slice consists of all statements in program P that may effect the value of variable v at some point p , and a dynamic slice consists only of statements that influence the value of variable occurrence for specific program inputs. In this paper, we concern the problem of dynamic slicing of object oriented programs which, to our knowledge, has not been addressed in the literatures. To solve this problem, we present the dynamic object oriented dependence graph (DODG)which is an arc classified digraph to explicitly represent various dynamic dependence between statement instances for a particular execution of an object oriented program. Based on the DODG, we present a two phase backward algorithm for computing a dynamic slice of an object oriented program.

HIV-Viral Hepatitis C Coinfection or Cross-Reaction of Rapid Diagnostic Orientation Tests? About a Clinical Case Observed in Brazzaville in 2016

Coinfection with human immunodeficiency virus (HIV) and viral hepatitis is associated with high morbidity and mortality in the absence of clinical management, making identification of these cases crucial. Screening for hepatitis viral-HIV coinfection before initiation of treatment for viral hepatitis or HIV is recommended. In this context, we report a case of possible cross-reaction between the serology of viral hepatitis C and HIV infection by rapid diagnostic orientation tests. Although these rapid tests are the main diagnostic tools in developing countries, their scientific validation must be required before they are made available to practitioners. The knowledge and the rigorous application of diagnostic algorithms of viral infections will make it possible to save money and to better organize the prevention and management strategies for patients as part of an integrated Hepatitis/HIV program.

评估何以促进深度学习

学校教育领域已经发展出“走出浅层学习的深度学习”“涵盖多种维度的深度学习”“提升核心素养的深度学习”和“指向知识创造的深度学习”四种类型的深度学习。我国常见的评估方式在促进深度学习方面存在许多“难为”之处,主要表现为深度学习所强调的隐性指标难以评估及以评促学难以达成。改进评估促进学生的深度学习,需要反思测试主义以凸显日常评估,反思“独白式评估”以加强“对话式评估”。我国在一定程度上仍然存在“应试文化”,为了使改进评估以促进深度学习得以可能,尤其需要突出深度学习所强调的隐性指标与显性指标的关联。同时,学校需要提高教师改进评估以促进深度学习的素养,帮助教师丰富评估知识,不断优化所持有的评估观,从而实现自己作为深度学习评估者的身份认同和重构。

OOP的封装性在Java中的试验研究

文章分析了面向对象编程(Object Oriented Programming,OOP)的封装性在Java中的具体应用,并进行了试验分析。试验结果表明,将OOP中的属性和方法用数据库的实体关系图(Entity Relationship Diagram,ERD)表示出来,再用Java封装就能很好地表示抽象的OOP封装性,通过用Java进行验证得出了实体名即Java的类名、属性名即实例变量名、insert语句即输入方法、select语句即输出方法、关系即处理方法的编程公式,程序运行结果与该公式完全一致。

Class Tester:一个基于状态转换的类测试工具的设计与实现

面向对象软件测试的类测试方法有三种:基于规约说明的类测试方法、基于类流图的类测试方法、基于状态转换的类测试方法.本文描述了一个针对C++语言的基于状态的类测试工具的设计和实现,介绍了该工具的体系结构和主要算法.对测试驱动器的自动生成的方法作了详细介绍.最后通过一个实例描述了该工具的工作流程.

基于ICEEMDAN−Laplace的足尺定向刨花板振动信号模态分析

为了无损、便捷检测足尺定向刨花板的动态剪切模量、弹性模量,在振动条件下通过改进型自适应噪声的完全集合经验模态分解(ICEEMDAN)和Laplace小波相关滤波法相结合来实现振动信号模态识别。采集足尺定向刨花板振动信号,通过ICEEMDAN分解得到若干固有模态函数(IMF)分量,将正交性指标和相关系数用作判据指标,并融合二次模态分解,筛选出含有足尺定向刨花板模态信息的IMF分量,再通过Laplace小波相关滤波提取足尺定向刨花板的固有频率,将检测结果与静态实验和仿真分析进行验证。结果表明:频率实验与仿真结果误差较小,在0.8%范围内;长度、宽度方向弹性模量动态检测结果与静态结果之间的相关系数分别为0.81282、0.74848,证明两者存在显著线性关系;面内剪切模量动、静态检测结果之间呈显著线性关系,相关性达到0.73385。

取向硅钢板坯凝固结构调控的工业化试验研究

对取向硅钢板坯在不同连铸工艺条件进行工业化试验,研究过热度、拉速、电磁搅拌参数与电磁搅拌结构等对铸坯凝固结构的影响,探讨调控取向硅钢凝固结构的有效手段。结果表明:过热度由20℃提高到25℃时,铸坯的等轴晶率由66.6%降至63.4%;电磁搅拌电流由200 A提高到900 A时,铸坯的等轴晶率由33.3%提高到66.6%;在拉速0.9,1.0,1.1 m/min条件下铸坯柱状晶倾角分别为5°,8°和12°。综合考虑拉速、过热度与电磁搅拌对取向硅钢铸坯凝固结构的影响,电磁搅拌是取向硅钢调控凝固结构最有效的手段。

面向属性概念格下的知识状态转移方法

如何高效率地寻找猜测答对或粗心答错情况下不相容答题状态对应受测者真实的知识状态是目前计算机自适应测试领域研究的一个热点问题.现有知识状态转移方法时间成本高,不适用于含有大量测试问题和技能的应用场景.并且,现有知识状态转移方法将合取模型和能力模型均视为能力模型,采用同一种方法进行知识状态转移,灵活性不够,评估效率不高.本文针对合取模型和能力模型,分别提出基于面向属性概念格的知识状态转移方法.首先由技能映射或多映射建立技能背景并诱导出对应的面向属性概念格,进一步使用概念格中概念的外延并结合最大概率方法得到受测者猜测或粗心情况下的真实知识状态,最后给出知识评估过程.实验表明,在知识评估结果相同的前提下,本文所提方法相比现有方法极大地降低了评估时间成本,因此具有更好的性能.

镭射BOPP基膜循环拉伸力学性能的试验研究

目的为研究双向拉伸聚丙烯(Biaxially Oriented Polypropylene,BOPP)薄膜在重复拉伸使用后的弹性模量变化以及应变变化趋势。方法以26μm BOPP薄膜为研究对象,以1、1.5、2、2.5、3、3.5、4 N为最大加载力分别进行加载周期为15次的单轴循环拉伸试验,总结对比循环次数以及加载力对弹性模量及棘轮应变的影响,分析薄膜性能变化趋势。结果通过对比同一加载应力不同循环下的弹性模量以及棘轮应变,发现在预设加载力下随着循环次数增加,薄膜弹性模量呈增大趋势,且增大幅度逐渐减小,其棘轮应变与弹性模量变化趋势一致;通过取均值对比不同加载力下的弹性模量以及棘轮应变变化,发现薄膜弹性模量随加载力增大而先增大后减小,最大应变以及最小应变均随加载力的增加而增大。结论通过试验研究得出了BOPP薄膜在循环拉伸中弹性模量及棘轮应变随加载力、循环次数增大的变化趋势;对薄膜性能变化有了一定的预测,并为实际加工中的张力选择提供了指导性建议。

根系排布方向对香根草固土效果影响试验研究

随着大众环保意识不断提高及工程环境问题日益显著,植物固土护坡技术受到了广泛重视,但根系的复杂性导致其固土效果难以量化分析。本研究测取了香根草真实生长时的根周土相对密实度,后选择了三种典型根系排布方向,并以此在不同围压下开展三轴压缩试验,探讨了不同排布方向的香根草主根对砂土的加固效果。研究结果显示,香根草根系的加入显著提高了土体的强度以及内摩擦角,而对黏聚力的影响较小,其加筋效果主要来源于根-土接触界面。此外,根系的排布方向也对其固土效果有显著影响,根系的水平排布和倾斜排布的固土效果相似,都不如竖直排布的加筋效果,该研究为理解绿化后的公路边坡浅层失稳提供了可靠参考依据。

新型装配式冷弯薄壁型钢墙体抗侧性能分析

为了研究使用矩形钢管连接的新型全预制冷弯薄壁型钢复合墙体的抗侧性能,设计了6个足尺试件,并进行了水平低周往复加载试验,分析了龙骨间距、覆面板类型、单面或双面覆板等因素对新型复合墙体试件抗侧性能的影响.新型墙体的覆面板为OSB板与硅晶钙板.试验结果表明:使用矩形钢管连接的新型复合墙体具有良好的整体抗震性能;单面或双面覆板对墙体抗侧性能影响显著,双面覆板的新型复合墙体的屈服荷载约为单面覆板新型复合墙体的2倍;龙骨间距和覆面板材料对墙体抗侧性能的影响相对较小.在试验基础上,使用OpenSEES软件建立了试验墙体的有限元分析模型,并针对矩形钢管壁厚、周边螺钉间距取值进行了参数分析.参数分析结果表明,矩形钢管连接件壁厚取值推荐为2.5 mm,周边螺钉间距推荐取50~100 mm.

面向对象测试方法在核电站仪控服务器软件测试中的研究与应用

核电站仪控服务器软件是由面向对象程序语言实现的核电专用设备软件,具有面向对象软件独有的特性,如抽象、继承、封装、多态等,使其与面向过程语言实现的软件相比更加灵活、复杂、多变,增加了测试的复杂度,增加了测试的难度,使得传统的测试技术在核电站仪控服务器软件的测试中越来越困难,越来越难以保证测试的充分性、完整性。为此,结合核电站仪控系统服务器软件运算过程复杂的特点,提出了一种针对核电站仪控服务器软件的面向对象测试方法,探讨了面向对象测试技术在核电站仪控系统非安全级软件确认测试中的可行性,为核电软件测试人员提供了软件测试的新思路。

国产MPOS系统精度测试与评估方法

微小型位置姿态测量系统(MPOS)是为观测载荷提供实时运动补偿信息的关键设备。针对国产MPOS在实时单点、事后差分和实时差分(RTK)定位等不同工作模式下的精度测试问题,结合通用航空载荷研制要求和摄影测量工程应用经验,提出了一种基于基准POS直接对比的测试方法和基于POS辅助空中三角测量方法,对国产MPOS测量精度及成图精度开展综合分析评估。结果表明,提出的直接对比法及航测成图法能够真实、客观反映国产MPOS系统在实际工程应用中的性能状态,且在相对理想作业条件下,采用一定数量控制点参与区域网联合平差,能够满足1∶1000成图限差要求,测量精度及工程应用效能与APX-15 UAV等国外同类型产品水平相当。

磁粉检测中不同检测方位与磁悬液浓度的组合试验

磁粉检测适用于铁磁性材料表面和近表面缺陷的检测,实际检测中,需根据不同的工件结构或摆放位置从不同方位实施检测,如水平面、斜面、立面及部分仰面等,检测方位、磁悬液浓度的不同对检测结果及检出率均有一定影响。通过3种代表性检测方位的模拟试验,验证了其影响性并提出4种最佳组合以供参考。

基于面向对象编程的电子产品自动化测试平台设计

由于电子产品的复杂性和多样性日益增强,传统测试方法无法满足现代电子产品的测试需求。因此,本文设计基于面向对象编程的电子产品自动化测试平台。在硬件方面,设计测试控制器和信号收发器,为测试提供必要的支持和保障。在软件方面,基于面向对象编程设计测试用例,确定电子产品测试项,电子产品自动化测试流程实现测试结果输出,平台测试结果表明,该自动化测试平台测试性能更优。