Object-oriented Environment Research Articles

Puzzle Pattern, a Systematic Approach to Multiple Behavioral Inheritance Implementation in Object-Oriented Programming

Object-oriented programming (OOP) has long been a dominant paradigm in software development, but it is not without its challenges. One major issue is the problem of tight coupling between objects, which can hinder flexibility and make it difficult to modify or extend code. Additionally, the complexity of managing inheritance hierarchies can lead to rigid and fragile designs, making it hard to maintain and evolve the software over time. This paper introduces a software development pattern that seeks to offer a renewed approach to writing code in object-oriented (OO) environments. Addressing some of the limitations of the traditional approach, the Puzzle Pattern focuses on extreme modularity, favoring writing code exclusively in building blocks that do not possess a state (e.g., Java interfaces that support concrete methods definitions in interfaces starting from version 8). Concrete classes are subsequently assembled through the implementation of those interfaces, reducing coupling and introducing a new level of flexibility and adaptability in software construction. The highlighted pattern offers significant benefits in software development, promoting extreme modularity through interface-based coding, enhancing adaptability via multiple inheritance, and upholding the SOLID principles, though it may pose challenges such as complexity and a learning curve for teams.

Electric DQ0 Library Model for Smart Grid Simulation

This paper addresses the pressing need for advanced simulation tools in electric phasor modeling and Smart Grid-Power to X systems. The motivation for this study stems from the critical importance of enhancing the balance between performance and the detailed dynamic representation of the system behavior in the simulations. The identified problem lies in the absence of a comprehensive framework that seamlessly integrates electric phasor DQ0 components into a multi-purpose object-oriented environment. The primary objective of this research is to develop and introduce two simulation libraries, centered around the core component, Electric_DQ0. These libraries aim to establish a robust phasor-based framework, incorporating essential electric components such as sources, loads, branches, power converters, and electric machines. The main goal is to enable dynamic frequency and voltage simulations, particularly focusing on transients in alternators and facilitating Voltage and Frequency Rate of Change analysis during power production-demand imbalances. The libraries were developed within a versatile object-oriented environment, employing the Electric_DQ0 components as the foundation. Through ports, these components transmit turning frequencies, supporting the simulation of dynamic frequency and voltage. The libraries are designed to comprehensively support monophasic and triphasic systems, encompassing delta and wye connections, with a flexible neutral configuration under both balanced and unbalanced conditions. A validation case is presented to demonstrate the tool’s ability to accurately reproduce predictions when compared to one of the most widely used electrical modeling tools in the market. A study case is also presented to evaluate the toolkit’s capabilities. The study sets a specific power demand to fulfill, utilizing diverse energy sources. The obtained results showcase the libraries’ effectiveness in addressing the identified problem, providing valuable insights into their performance and applicability in real-world scenarios. The results demonstrate the efficacy of the proposed framework, delivering accurate outcomes within a reduced execution time.

Динамическое проникание жесткого плоского ударника в неоднородную преграду по нормали и под углом

The problem of dynamic penetration of a rigid flat striker into an inhomogeneous target along the normal and at an angle is considered. The article presents a mathematical model, differential equations and corresponding Cauchy problems. The algorithm for the numerical solution of the problem is imple-mented in the Turbo Pascal language in the object-oriented environment of the Borland Delphi 7 compiler using graphical tools and high-precision numerical methods necessary for visualizing the results. Verifi-cation of the model is based on an analytical solution for the problem of normal penetration. Based on numerical experiments, rational characteristics of a two-layer target of minimum weight are obtained.

Мониторинг образовательных результатов в виртуальной среде Moodle

The authors investigate the problem of monitoring learning outcomes, which contributes to improving the quality of training of university graduates. The tools of the Moodle e-learning environment to monitor learning activity of students are considered. The possibilities that Moodle services provide to the teacher to improve the quality of course resources, as well as the effectiveness of student learning are identified. The Moodle educational environment (modular object-oriented dynamic learning environment) is a free learning management system focused primarily on interaction between the teacher and students, although it is also suitable for conducting traditional distance courses, as well as supporting in-person training. The study shows that by means of Moodle, a teacher can create courses, filling them with content in the form of texts, auxiliary files, presentations, questionnaires, tests, etc. As a part of the study, the authors created an electronic training course “Fundamentals of Financial Computing” with an emphasis on the use of the interactive control and measurement complex of the development of the discipline. The monitoring of students’ cognitive potential as a component of mathematical competence was carried out. The results of pedagogical measurements are presented, which demonstrate the positive dynamics of the quality of subject education in the conditions of informatization of life spheres.

Использование объектно-ориентированной среды для создания программ с применением управляющих операторов и циклов

The features of the development of packages of applied programs using control operators and loops in the object-oriented environment of C ++ Builder are considered. The examples of work with the use of control operators and loops in C ++ Builder developed by the authors and the corresponding algorithms are presented in the form of block diagrams, program codes and program interfaces. The technology of using the corresponding operators in the development of branching and cyclic algorithms in solving engineering problems is described. The features of using in practice the debugging tools of the environment when debugging programs with branches and loops are stated. The analysis of the hierarchy of conditional operators from the point of view of the optimality of its organization and the syntax for describing various variants of cyclic structures in the C ++ Builder language are carried out. The external specification and the main features of the solution of the assigned tasks are considered. It is substantiated that the development of algorithms and programs using control operators and loops in the C ++ Builder environment is the basis for solving engineering problems using software on a computer. The proposed approaches and algorithms can be used in practice as they can serve as a complex example in solving the set engineering and technical problems.

Characterization of the Finite Element Computational Fluid Dynamics Capabilities in the Multiphysics Object Oriented Simulation Environment

Abstract The multiphysics object-oriented simulation environment (moose) is a code package that couples a variety of physics modules, allowing for highly accessible multiphysics simulations. The physics modules include a finite element Navier–Stokes (N–S) module that is designed to solve laminar fluid dynamics problems. The usage of this module in multiple recent studies coupled with the growing interest in moose for usage in nonlight water reactor safety studies by the Nuclear Regulatory Commission (NRC) prompted the authors to investigate the computational fluid dynamics capabilities of moose. A two-dimensional laminar flow past a circular cylinder scenario is simulated in the moose framework to investigate the effectiveness of the N–S module. Simulations assumed an unsteady laminar flow with a Reynolds number of 200. To verify the results from moose, similar simulations were conducted using the well-utilized simulation of turbulent flow in arbitrary regions—computational continuum mechanics C++ (star-ccm+) finite volume code. Results from both codes are also compared to some results from literature. Velocity and pressure profiles of both transient simulations were compared. The numerical and input errors in moose are also visualized with contour plots to qualitatively understand the evolution of the errors across time and space. The comparisons between moose and star-ccm+ showed nearly perfect agreement between the codes for velocity and pressure, especially after the development of the vortex street in later time-steps. The force coefficients showed excellent agreement after the development of the vortex street, but demonstrated notable discrepancies prior to the vortex street development, which is likely due to how each code simulated the approach to the vortex street in earlier time-steps.

A Literature Survey of Complexity Metrics for Object-Oriented Programs

Software complexity refers to the factors that determine the complexity level of a software project. High complexity is caused by the many attributes used in the system and the complex logic relationships among these attributes and features. The increased complexity of software is undesirable and affects maintenance. Over the years, Software Engineering scholars recommended several metrics like Halstead metric, cyclomatic complexity, and line of code metrics to deal with the complexity. With the complexity increasing as time goes by, there is a need for better metrics that can evaluate software more effectively. This research aims to develop a metrics model to determine the features that cause high complexity in software design architectures and to implement the multi-language complexity evaluation model for software architectures. Although this is the case, the literature on complexity metrics that implement diagram-centric complexity measures are inadequate. This study presents the outcomes obtained from our survey on metrics utilized in object-oriented environments. The survey comprises a small set of the most common and frequently implemented software metrics, which could be adopted to a group of object-oriented metrics and object-oriented programming. After reviewing the literature, Findings indicate that metrics that employ diagram-centric complexity measures are lacking.

Using the Learning Management System "Modular Object-Oriented Dynamic Learning Environment" in Multilingual Education

The article aims to study the possibilities, identify features, and assess the prospects for using the LMS MOODLE system (learning management system "Modular Object-Oriented Dynamic Learning Environment") for the formation of language skills in multilingual education. The study involved two groups of respondents, comparable in gender and age: 112 linguistic students (group A) and 109 non-linguistic students studying several foreign languages (group B). The respondents' answers to the questions of a specially developed questionnaire were analyzed, which made it possible to compare the parameters of training using the LMS MOODLE platform and traditional classroom training. To determine the connotative (individual-value) attitude towards obtaining multilingual education using the LMS MOODLE platform and to identify its subjective-personal meaning, Ch. Osgood's semantic differential method was used on the basis of a seven-point bipolar scale. Linguistic and non-linguistic students assessed differently LMS MOODLE platform for multilingual education, which is associated with different motives for acquiring multilingual competence and its professional significance.

Foundations for a Fission Battery Digital Twin

As the nuclear industry moves toward construction of microreactors and next-generation reactors, these efforts pose new challenges. A digital-twin tool will reduce costs and risk through integration of the disparate systems used in the design, construction, and operation of these reactors. Recent investments at Idaho National Laboratory (INL) in open-source digital engineering and multiphysics framework development provide a foundation from which to create and evaluate a digital twin for nuclear reactors. This digital-twin tool will use the Single Primary Heat Pipe Extraction and Removal Emulator (SPHERE) and Microreactor AGile Non-nuclear Experimental Testbed (MAGNET) as case studies to develop a digital twin with both single and 37 heat pipe test articles. The digital twin will provide the capabilities of remote monitoring and unattended operation (autonomous control) of these systems. A digital twin is a digital replica of an operating asset that can display data received from live sensors, update a physics model for the asset with the received data, compute predictive results of operational status with artificial intelligence (AI) to aid in optimizing asset use, and apply asset control accordingly. This twin will be developed through integration of the open-source technologies Deep Lynx (a data-warehouse technology) and the Multiphysics Object-Oriented Simulation Environment (MOOSE), physical-asset sensors, and physical-asset controls. Specifically, the general AI will successfully predict the events described as MAGNET heat pipe article test cases (such as heat pipe failure) using integrated data from the MAGNET sensors and physics-based models, including developed meta models. The integration of open-source INL software and AI assets with sensor data from a test bed will lead to a repeatable framework and guide for the creation of future digital twins. The team will also perform AI model training and experimentation to determine what models and features are most important to enable intelligent, autonomous control as well as to evaluate and determine best practices for digital-twin cybersecurity.

Особенности разработки программных продуктов с использованием массивов в объектно-ориентированной среде

The features of software development using static and dynamic arrays in the C ++ Builder object-oriented environment are considered. The syntax of various options for creating static and dynamic arrays in the C ++ Builder language is considered in detail. Examples of working with static and dynamic arrays in C ++ Builder developed by the authors and the corresponding algorithms are presented in the form of block diagrams, program codes and program interfaces. Examples of program development are given using one-dimensional and multidimensional arrays. Examples of memory allocation are given for dynamic arrays. The choice of the required method for solving the problem is substantiated, taking into account the available input data and taking into account the expected results, as well as the peculiarities of their obtaining and processing. The external specification and the main features of the solution of the assigned tasks are considered. The development of algorithms and programs for solving problems using arrays in the C ++ Builder environment is the basis for solving engineering and technical problems using software on a computer. The proposed approaches can be used in practice, since the algorithms outlined in the work will serve as a complex example in solving the set engineering and technical problems.

Hybrid Maintainability Prediction using Soft Computing Techniques

Effective software maintenance is a crucial factor to measure that can be achieved with the help of software metrics. In this paper, authors derived a new approach for measuring the maintainability of software based on hybrid metrics that takes advantages of both i.e. static metrics and dynamic metrics in an object-oriented environment whereas, dynamic metrics capture the run time features of object-oriented languages i.e. run time polymorphism, dynamic binding etc. which is not covered by static metrics. To achieve this, the authors proposed a model based on static and hybrid metrics to measure maintainability factor by using soft computing techniques and it is found that the proposed neuro-fuzzy model was trained well and predict adequate results with MAE 0.003 and RMSE 0.009 based on hybrid metrics. Additionally, the proposed model was validated on two test datasets and it is concluded that the proposed model performed well, based on hybrid metrics.

3-Dimensional Multiphysics Modeling of Behaviors of Pressurized Water Reactor Fuel Rods With Missing Pellet Surface

A 3-dimensional (3D) fuel performance analysis program, able to simulate normal operating conditions and accident conditions for PWR fuel behaviors, was developed based on the Multiphysics Object-Oriented Simulation Environment (MOOSE) finite-element framework. By taking fission products swelling, densification and expansion of pellet, thermal and irradiation creep, gap heat transfer, fission gas release, and cladding crack propagation into consideration, detailed fuel behaviors have been simulated in a multiphysics coupling way. Local defects in fuel pellet caused during manufacturing and filling processes known as the missing pellet surface (MPS) can cause abnormal stress distribution of the cladding and it could even lead to cladding failure. Taking Stress Corrosion Cracking (SCC) phenomenon into consideration, a simulation of PWR fuel rodlet that consists of a pellet with an MPS defect and an intact pellet was conducted. The fuel rod has experienced with sorts of events, including normal operating conditions and a high-power ramp event. The simulation results indicated that: 1) The MPS defect affects the temperature and displacement distribution in the vicinity of the MPS defect. When the pellets are in contact with the cladding, the inner surface of the cladding presents a large tensile hoop stress, which accelerates the crack propagation. 2) During the ramp event, the crack propagation rate was higher than that under normal condition and crack length expanded by about 0.1 µm.

Investigation conditions for inclusion of gamification elements in study of the basics of algorithmization and programming to improve the quality of educational results of pupils

The problem and the aim of the study. Formation of programming skills, communication with artificial intelligence and other people, the level of thinking development are the basic indicators that determine effectiveness of the didactic system. Within the framework of e-learning, digital technologies, gamification elements, cyber-physical devices, etc. are actively used to support the quality of learning. The authors investigate conditions for effective inclusion of gamification elements in algorithmization and programming activities to increase the level of educational achievements of pupils. Research methods. The analysis and generalization of scientific literature on the problems of gamification of learning and cognition processes, the study of the basics of algorithmization are used. For development of game projects, debugging and testing applications, the ideas of structural programming, the method of step-by-step detailing are used. The programming technology is supported by the principles and techniques of gamification. Empirical methods that were used are observation, analysis of the results of work in the Logo program (user interface, game design, choice of algorithmic constructions, etc.). The study involved 48 pupils who study in grades 5-6 in Kirov school №11. The Pearson’s χ2 (chi-square) criterion was used as a method for statistical processing of the experimental data. Results. The pupils of the experimental group were involved in the purposeful cognitive activity on development of game projects using the Logo programming language (studying fundamental concepts, graphical capabilities, managing a Turtle in the object-oriented environment, research, collaboration, social activity). Statistically significant differences were found between the experimental and control groups in the level of educational achievements χ2emp.2 > χ2crit0.05 (7.885 > 7.815). In conclusion, the conditions under which the gamification of learning the basics of algorithmization and programming is maximally effective for improving the quality of academic achievements of schoolchildren are summarized: correlation of the didactic goal and the result of the game form of work, the choice of the plot for the game project, thinking through the mechanisms of feedback and interactivity, the distribution of roles, etc.

PEMBUATAN FILE SYSTEM GLUSTERFS DISTRIBUTED- REPLICATED VOLUME DI SEKOLAH VOKASI IPB UNIVERSITY

College of Vocational IPB University (SV-IPB) uses a client-server system as an information technology architecture. The server provides several services that are used to assist the teaching and learning process at the IPB Vocational School. The application used to provide services is the Modular Object-Oriented Dynamic Learning Environment (MOODLE) which is used for e-learning. SV-IPB provides two Virtual Machines which are used as a web server and a database server. The use of a single web server to replace the request is certainly less stable because there is no web server to back it up so that the service will stop. This situation states that the use of a single web server does not have high information (high available). To overcome this problem, the cluster technology can be used to group several web servers in SV-IPB. The web server clustering technology used is the Gluster File System (GlusterFS) with the volume type used, namely Distributed-replicated volume. Based on the tests that have been carried out, this project can solve the problem that has been described earlier that "one web server is down, there is still another web server that can so that the client request process does not stop. In addition, the clustering technology used is required for the use of load balancing web servers so that it can reduce the load on each server because the request process will be sent alternately between web servers.

What Does the Future Hold for a Surgical Trainee? This Lockdown Is Not a Letdown Yet: A Survey on Moodle Learning Management System as a Part of Blended Learning During COVID-19 Pandemic.

BackgroundThe COVID-19 pandemic brought about a major shift in the educational training of surgical trainees. As the Lockdown was implemented and the daily workforce reduced, an alternate method was employed to provide uninterrupted learning. Blended learning that includes virtual learning with face-to-face learning/teaching was utilized for the surgical trainees. MOODLE (Modular object-oriented dynamic learning environment), an open-source learning management system, was integrated as an Online Component of our Blended Learning Program. We aimed to evaluate the perception of postgraduate trainees of General Surgery regarding the benefits and limitations of Blended Learning, particularly its online component, i.e., Moodle LMS, for the betterment of surgical -education during the COVID-19 pandemic.Material and MethodsThirty-three postgraduate general surgery trainees were enrolled in a blended learning program, in which its online component, Moodle LMS, comprised four major topics on General Surgery. A questionnaire was provided to the trainees to obtain feedback on blended learning in general, and Moodle LMS was mainly themed on the Likert scale.ResultsThe approach of blended learning was positively received by the participants, the majority of whom were females (75%) and comprising of Year 1 residents (33.3%). Nearly half of the participants found Moodle LMS user-friendly, practical and a good platform for learning. However, nearly two thirds (60.6%) were uncertain if it ever helped in applying knowledge to interpret laboratory and radiological results for patient management. Even then, most of them found that the face-to-face component of blended learning helped them develop specific clinical and surgical skills (42.4%). Emphatically, 78.7% would recommend it for surgical training.ConclusionBlended learning was found to be beneficial in the training process of surgical postgraduates in the current COVID-19 pandemic situation. We recommend it for the training of doctors for optimized learning.

Pedagogical Technology as a Means to Develop Educational Self-Sufficiency in Students of Higher Education Organizations of FSIN Russia

Introduction: the paper addresses the issue of enhancing the role of individual extramural studies for students of higher education institutions of the Federal Penitentiary Service of Russia and searches for ways to form students’ attitude towardindividual extramural studiesas a significant component of the educational process. Aim: description and scientific substantiation of a pedagogical technology aimed to develop educational self-sufficiency in future staff of the penal system. Methods: theoretical methods (studying and analyzing psychological and pedagogical literature on the subject, pedagogical simulation) and empirical methods (survey, performance results analysis). Results: in the course of our research we formed a set of definitions and terms, the key one among which is “educational self-sufficiency”. Pedagogical simulation helped us describe distance educational technology based on interactive pedagogical communication using Modular Object-Oriented Dynamic Learning Environment (Moodle). This technology focuses on the development of cognitive motivation in students, and the motivation source is found in a professionally oriented educational dilemma. An educational dilemma serves as an informational and conceptual unit that covers the content of a certain topic and the corresponding competence laid down in the structure of an academic discipline. The empirical research we conducted has shown that the use of this educational technology actually mobilizes students’ cognitive activity and fuels their interest in learning and future profession beyond the topics intended for classroom-based studies. Conclusions: we have found out that the performance efficiency of individual extramural studies depends on how the teacher organizes external supervision. It should correlate with the inner needs of students and bring to the fore a wide range of cognitive motives: motivating directly, motivating intellectually, motivating prospectively. Being in line with these conditions, the educational technology we describe can be used on a large-scale basis. Keywords: educational self-sufficiency; educational process; pedagogical technology; cognitive motives; educational dilemma; electronic educational environment.

Process economics evaluation of cell-free synthesis for the commercial manufacture of antibody drug conjugates.

Continuous improvements of cell-free synthesis (CFS) systems have generated interest in adopting the technology for the manufacture of biologics. This paper provides an evaluation of the manufacturing cost-effectiveness of CFS for the commercial production of antibody-drug conjugates (ADCs). The evaluation was performed using an advanced techno-economic engine (TEE) built in Python. The TEE is programmed in an object-oriented environment capable of simulating a plethora of process flowsheets and predicting size and cost metrics for the process and the facility. A case study was formulated to compare the economics of whole bioprocesses based on either a CFS system or a mammalian cell system (CHO) for the manufacture of an ADC at a range of product demands. The analysis demonstrated the potential of CFS for the commercial manufacture of biologics and identified key cost drivers related to the system. The CFS system showed an approximately 80% increase in the cost of goods compared to CHO with a significant cost attributed to the in-house manufacture of the bacterial cell extract, necessary for the CFS reaction step in the process. A sensitivity and target analysis highlighted the need for further process improvements especially in the titer for the CFS process to become more competitive against well-established systems.

ЛИНГВОАКУСТИЧЕСКИЕ РЕСУРСЫ В ОБЪЕКТНО-ОРИЕНИРОВАННОЙ ДИНАМИЧЕСКОЙ СРЕДЕ

This article is devoted to the study of linguoacoustic resources, which are presented in an object-oriented dynamic environment as ready-to-use phrases. The systematization of linguoacoustic resources in the form of a phrasebook in an object-oriented dynamic environment determines the direction of a person in the study of a foreign language at a conscious level and supports this process with the standard of correct speech behavior, for which the acoustic component is primary. The formation of mental actions in an object-oriented dynamic environment occurs gradually due to the fragmentation of linguoacoustic material into doses, followed by assignment with immediate feedback. The presence of audiovisual components that serve as a guideline instead of rules-instructions, speaks of the acquiring of a foreign language at the functional level, which begins with obtaining a standard of speech behavior. The situation, which is given in the audiovisual presentation, contains everything that the linguistic unit contains, so that the learners acting as the characters depicted in the example have no doubts about what kind of speech action they should perform. As a result, the ability to perceive, understand and recognize speech structures in the given communication conditions is formed. In this way, the student becomes proficient due to a system, for which it is necessary not the rote learning, but the meaningful memorizing of learning material.

The Effects of Inhomogeneous Elasticity and Dislocation on Thermodynamics and the Kinetics of the Spinodal Decomposition of a Fe-Cr System: A Phase-Field Study

The effects of inhomogeneous elasticity and dislocation on the microstructure evolution of α′ precipitate in a Fe-Cr system was investigated using a Computer Coupling of Phase Diagrams and Thermochemistry (CALPHAD)-type free energy incorporated phase-field method. In order to simulate the precipitation behavior by phase-field modeling in consideration of inhomogeneous elasticity, a Multiphysics Object-Oriented Simulation Environment (MOOSE) framework was used, which makes it easy to use powerful numerical means such as parallel computing and finite element method (FEM) solver. The effect of inhomogeneous elasticity due to the compositional inhomogeneity or the presence of dislocations affects the thermodynamic properties of the system was investigated, such as the lowest Cr concentration at which spinodal decomposition occurs. The effect of inhomogeneous elasticity on phase separation kinetics is also studied. Finally, we analyzed how inhomogeneous elasticity caused by compositional fluctuation or dislocation affects microstructure characteristics such as ratio between maximum precipitate size with respect to the average on early stage and later stage, respectively.

Integration of MOODLE into the classroom for better conceptual understanding of functions in Mathematics

Many South African educational institutions are adopting learning management systems (LMS) into their daily teaching and learning practice. The Western Cape Education Department piloted Modular Object-Oriented Dynamic Learning Environment (Moodle), an LMS for improving teaching and learning. The objective of the research reported on here was to determine whether Moodle improved Grade 10 learners’ conceptual understanding of the topic, functions, in mathematics. The research investigated two classes; one dependent upon a traditional chalk-and-talk teaching method (control), and another exposed to Moodle (experimental). It was found that learners constructed their own knowledge by drawing on resources embedded in Moodle and framed within a Social Constructivist theory. A hybrid e-learning framework was deployed; learners acquired knowledge by interacting with computers. Interaction was monitored and results were recorded using online surveys and tests. A quasi-experimental design was employed to compare the groups. The comparisons were statistically analysed. Results showed that the functionalities within the Moodle LMS were instrumental in improving conceptual understanding of mathematical functions.