Object-oriented Programming Code Research Articles

Asynchronous object-oriented approach to the automation of the 0.8-meter George Mason University campus telescope in Python

We present a unique implementation of Python coding in an asynchronous object-oriented programming (OOP) framework to fully automate the process of collecting data with the George Mason University (GMU) Observatory's 0.8-meter telescope. The goal of this project is to perform automated follow-up observations for the Transiting Exoplanet Survey Satellite (TESS) mission, while still allowing for human control, monitoring, and adjustments. Prior to our implementation, the facility was computer-controlled by a human observer through a combination of webcams, TheSkyX, ASCOM Dome, MaxIm DL, and a weather station. We have automated slews and dome movements, CCD exposures, saving FITS images and metadata, initial focusing, guiding on the target, using the ambient temperature to adjust the focus as the telescope cools through the rest of the night, taking calibration images (darks and flats), and monitoring local weather data. The automated weather monitor periodically checks various weather data from multiple sources to automate the decision to close the observatory during adverse conditions. We have organized the OOP code structure in such a way that each hardware device or important higher-level process is categorized as its own object class or "module" with associated attributes and methods, with inherited common methods across modules for code reusability. To allow actions to be performed simultaneously across different modules, we implemented a multithreaded approach where each module is given its own CPU thread on which to operate concurrently with all other threads. After the initial few modules (camera, telescope, dome, data I/O) were developed, further development of the code was carried out in tandem with testing on sky on clear nights. The code, in its current state, has been tested and used for observations on 171 nights, with more planned usage and feature additions.

An efficient variable-node XFEM for modeling multiple crack growth: A Matlab object-oriented implementation

We present a Matlab object-oriented implementation of an efficient variable-node extended finite element method (XFEM) for multiple crack growth simulation in brittle materials. To enhance the accuracy of the present method, not only the local mesh refinement strategy is used, but also the variable-node elements are adopted to directly link different scale elements, saving the computational cost. In order to efficiently conduct coalescence detection, a modification is also presented. A stability analysis is performed to determine active crack tips, and the crack length control scheme is employed to model multiple crack growth. Mesh is locally refined simultaneously with the extension of cracked area via a straightforward manner. A general computer program structure for the Matlab object-oriented programming code for the variable-node XFEM is described. All those desirable features of the present work are demonstrated through five numerical examples with branching in linear-elastic fracture mechanics. In addition, this work provides an efficient computer code written by Matlab programming language for computational fracture simulation, which is for educational and academic uses.

The accuracy of dependency analysis in static architecture compliance checking

SUMMARY Architecture compliance checking (ACC) is an approach to verify conformance of implemented program code to high-level models of architec tural design. Static ACC focuses on the modular software architecture and on the existence of rule violating dependencies between modules. Accurate tool support is essential for effective and efficient ACC. This paper presents a study on the accuracy of ACC tools regarding dependency analysis and violation reporting. Ten tools were tested and compare d by means of a custom-made benchmark. The Java code of the benchmark testware contains 34 different types of dependencies, which are based on an inventory of dependency types in object oriented program code. In a second test, the code of open source system FreeMind was used to compare the 10 tools on the number of reported rule violating dependencies and the exactness of the dependency and violation messages. On the average, 77% of the dependencies in our custom-made test software were reported, while 72% of the dependencies within a module of FreeMind were reported. The results show that all tools in the test could improve the accuracy of the reported dependencies and violations, though large differences between the 10 tools were observed. We have identified10 hard-to-detect types of dependencies and four challenges in dependency detection. The relevance of our findings is substantiated by means of a frequency analysis of the hard-to-detect types of dependencies in five open source systems. DOI: 10.1002/spe.2421

Застосування шаблону проектування Composite та технології LINQ до задачі префіксного кодування тексту за допомогою алгоритму Хаффмана

The designed methods are the implementation of the object-oriented architecture as the class diagram corresponding to the implementation of the Composite design pattern according to the requirements of the flexible implementation of the Huffman tree, the method of the dynamic iterative Huffman tree building. This tree uses the dynamic collection of the node interface using the Visual C# language and the creation method of the initial set of the leaf nodes using the LINQ technology. The implementation methodologies are the idea of the Composite design pattern for the handling with the tree hierarchical structures, the possibilities of the Visual Studio 2010 integrated development environment and the possibilities of the .NET 4.0 Framework and the LINQ technology within Visual C# programming language. The research results are the object-oriented program code in Visual C# language and the class diagram in UML language that illustrates application of the design pattern and principles of inheritance, abstraction, polymorphism and encapsulation for the implementation of the flexible and scalable object architecture of the Huffman tree. The advantages of the mentioned software architecture, the examples of the organization and the storage of large arrays of the text data with the key for decoding symbol table are presented. This proves practical value of theShannonlemma in the field of information and coding theory.

Empirical Analysis of the Reusability of Object-Oriented Program Code in Open-Source Software

Empirical Analysis of the Reusability of Object-Oriented Program Code in Open-Source Software