Virtual Environment Model Research Articles

Domain-oriented information search on the Internet

The article is devoted to the study of the problem of information search on the Internet by using knowledge about the domains of the Web space. The domain information model (IM), the virtual Web environment model (VWE) and the user query model (UQ) are proposed, as well as the relationships and mapping principles between them are investigated. The possibility of providing a thematic focus, improving the quality and efficiency of the search process, improving results using an information model of domain representation is considered. Based on this model, a domain-oriented information search system for the Internet Web space has been developed. To improve the quality of the search engine and search results, a fuzzy logic approach is used, thanks to which a fuzzy domain-oriented information model of the Web space is proposed. Within the framework of the proposed models, methods have been developed for determining the content connectivity of Web documents, dividing the Web space into related Web areas, and virtual unification of Web areas.

Simulation of deformation on 3D organ models using haptic device

Günümüzde, bilgisayar grafiklerindeki gelişmeler sayesinde, birçok nesnenin asıllarına uygun şekilde sanal ortamda 3B modellenebilmesinde kayda değer gelişmeler elde edilmektedir. Tıp eğitiminde geliştirilen simülatörler ile organlar üzerinde doktor adaylarının çeşitli senaryolar kullanarak sayısız tekrar yapmalarına olanak sağlanarak pratik kazanmaları gerçekleştirilmektedir. Bu çalışmada, insan vücudu içerisinde bulunan safra, böbrek ve dalak gibi yumuşak dokuya sahip organların deformasyon algoritmaları ile yüzeysel benzetimlerinin yapılabilmesi için bir simülatör yazılım platformu geliştirilmiştir. Geliştirilen simülatör üzerinde, tasarlanan dokunsal cihaz donanımı ile anatomik yapılarına uygun şekilde 3B olarak modellenen organlar üzerine dokunulduğunda ya da çekme kuvveti uyguladığında model üzerinde gerçekleşen deformasyonun gerçekleşmesi sayesinde geri bildirim sağlanmıştır. Çalışmada, deformasyonun alınabilmesi için kütle yay ve moleküler modelleme metotları kullanılmıştır. Ek olarak, dokunsal cihaz ile modellenmiş örgü yapısı içerisinde hangi noktaya temas edildiğinin tespiti için çarpışma tespiti yöntemi tercih edilmiştir. Çalışma kapsamında geliştirilen simülatör üzerindeki tüm benzetimler, OpenGL kütüphanesi içerisinde bulunan fonksiyonlar kullanılarak gerçek zamanlı olarak gerçekleştirilmiştir. Ayrıca simülatörden toplamda 11 acemi ve uzman kullanıcı için simülasyon geri bildirimleri toplanmış ve her bir yumuşak doku için kullanıcıların elde ettikleri operasyon süreleri karşılaştırılmıştır. Yürütülen deneysel çalışmalar ve istatiksel analizler neticesinde, geliştirilen yazılım platformunun temas tespiti, tepki kuvveti, gerçek zamanlı benzetim ve deformasyon sonuçlarının görsel olarak ve hız açısından istenilen seviyede olduğu görülmüştür.

Design of Gaussian process based model predictive control for seam tracking in a laser welding digital twin environment

Vision-based control systems are widely applied in laser welding, wherein the seam and weld pool can be directly monitored so that the welding speed and laser power can be adjusted. Nevertheless, seam tracking based on the coaxial vision sensor is unstable, caused by the varied illumination conditions and material surface defects. The accuracy and robustness of the controller remain a major challenge. In this study, a new seam prediction method based on Gaussian process surrogate modeling is proposed, where the sensing errors are quantified. The surrogate model predicts the future positions of the seam based on the previous observations as well as error bounds, which are utilized in the control for seam tracking. The proposed Gaussian process based model predictive control approach is evaluated in a new virtual digital environment model constructed with the globally assembled images that are captured in the real-world welding environment. The efficiency, accuracy, and robustness of the proposed method are evaluated with welding experiments. The experimental results show that the maximum tracking error in the proposed method is 42 % less than that in the standard proportional-integral-derivative controller.

Modeling and simulation of virtual learning environment for automatic control principle

Modeling and simulation of virtual learning environment for automatic control principle

Online Visual Communication and Scene Reconstruction of Cruise Travel under the Background of Virtual Reality

This paper takes the cruise passenger cabin as the research object, builds the virtual environment model according to the relevant theoretical knowledge and materials, introduces and studies the theory of ergonomic design evaluation, establishes the human-machine environment evaluation index system and comprehensive evaluation model of the cruise passenger cabin, introduces several common comprehensive evaluation methods, compares the advantages and disadvantages of different methods, and combines them with this design object so as to select the applicable evaluation method to evaluate the cabin design scheme. It also introduces several common comprehensive evaluation methods, compares the advantages and disadvantages of different methods, combines them with the design object, so as to select the applicable evaluation methods to evaluate the cabin design scheme and make the cabin design evaluation more systematic, accurate, and reasonable, realizes the three-dimensional visualization of the cruise ship cabin based on virtual reality technology and other technologies, and conducts the ergonomic evaluation of the design effect. The relevant knowledge involved includes human-machine-environment system engineering theory, 3D modeling theory, hierarchical analysis theory, fuzzy comprehensive evaluation theory, and virtual reality development theory. The concept of intelligent environment design is introduced into the environmental design of the intelligent entertainment system of cruise ships, and after the systematic study of the user’s demand level and cabin environment design element system, the problems existing in it are handled and combined with intelligent products, the different functions of intelligence are classified and studied, and the different forms of control are specifically studied to provide the basis for the subsequent specific design. In the case study, an overall evaluation of the architectural aesthetics of the target ship was derived through evaluation experiments. Based on the results, specific indicators at different levels can be traced, thus providing guidance directions for optimal design. The methods such as fuzzy synthesis evaluation and the idea of integrating the evaluation process with VR experience adopted in this paper can provide reference ideas for similar studies.

A framework for synthetic image generation and augmentation for improving automatic sewer pipe defect detection

Sewer pipes are essential infrastructure for discharging wastewater. Regular pipe inspection is necessary to prevent malfunction of sewer systems, for which closed-circuit television (CCTV) crawlers are commonly used to capture images of the pipe interior. As manual assessment of pipe condition is labor-intensive and time-consuming, automated defect detection using computer vision and deep learning has been increasingly studied in recent years. However, deep learning approaches require large amount of annotated data for model training. Data collection in underground sewer pipes is expensive and difficult since they are inaccessible without the use of an inspection robot. Meanwhile, ground-truth annotation needs to be accurate and consistent, requiring massive time and expertise. This paper proposes a framework for synthetic data generation and augmentation to address the data shortage problem for sewer pipe defect detection. First, synthetic images of sewer pipes are generated by 3D modeling and simulation in virtual environment. The quality of the generated images is then enhanced using style transfer with reference to real inspection images. In addition, a contrastive learning module is developed to further improve the deep learning process for defect detection. Experiment results show that the average precision (AP) of the defect detection model is improved by 2.7% and 4.8% respectively after adding style-transferred synthetic images and applying the contrastive module. When both methods are applied, the AP of the model is boosted by 7.7%, from 22.22% to 23.92%, indicating the effectiveness of our proposed approaches. This study is expected to alleviate the burden on data collection and annotation for applying deep learning models in defect detection.

Development of a Virtual Learning Environment Model to Fortify Life Skills for Teenage of Thailand

Developing a virtual learning environment model to fortify life skills for teenagers in Thailand entails an application between information technology and communication for managing an instruction in life skills and expanding the opportunities of Thai teenagers to have access to the skills contents. The objectives of research were to develop the virtual learning environment model to fortify life skills for teenagers in Thailand. There were 4 sample groups: 176 specialists in life skills; 45 teenagers at the age of 12-18 years; 5 experts in related fields; and 9 specialists in related fields. There were 4 components of the model of virtual learning environment to fortify life skills for Thai teenagers: input, processes, output, and feedback. The model of virtual learning environment to fortify life skills for Thai teenagers gained the process and outcome was 89.66/90.90. The result indicated that the score of process of model was 89.66% and the score of product of model was 90.90%, and the efficiency index of 0.8063. The satisfaction towards virtual learning environment is fluctuating but tend to be useful for learners. This virtual learning environment model can use and employ for implementing in education.

Non-photorealistic Visualization of 3D City Models using Visual Variables in Virtual Reality Environments

Visual variables are important factors for visualization in 2D maps, and the study of non-photorealistic visualization of 3D city models in virtual environments using visual variables is also necessary to represent the attributes of city such as energy consumption. This study proposed a set of visual variable mapping model based on 3D geographical environment and conducted user cognitive test. The goal of this research is to verify the applicability of visual variables in 3D space and explore the impact of disturbing visual variables on user cognition. The results show that visualization of compound visual variables in 3D space is more effective than single variable mapping, and it makes up for the shortcomings of single mapping. It is effective to study the visualization effect in three-dimensional geographical environment using virtual reality technology. The results from this case study provide guidance for 3D user-centric visualization technology and make contribute to the development of smart city.

ANC System Modeling and Simulations in a Wide-Area Virtual Environment Using FDTD Approach with Perfectly Matched Layer Absorbing Boundaries

ANC System Modeling and Simulations in a Wide-Area Virtual Environment Using FDTD Approach with Perfectly Matched Layer Absorbing Boundaries

What’s ethics got to do with it? Manager behavioral modeling in virtual environments

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Research on Environmental Art Design System Based on Virtual Reality Technology

Traditional environmental art geographical environment is described by two-dimensional image, and the environmental information obtained is lack of intuition and interactivity. This paper takes the application of computer virtual reality technology in the construction of environmental art design system as the starting point. According to the three-dimensional virtual reproduction of environmental art, different entity models and terrain models in virtual environment are molded by Creator modeling software. At the same time, the application of computer virtual reality technology in the construction of environmental art design system is simply analyzed.

A continuous switching contact model for virtual environment based teleoperation

Virtual environment (VE), as the proxy of slave contact environment, is the most promising technology to solve the time-delay problems in teleoperation. The accuracy of the predicted force depends not only on the reliability of the contact model but also on the estimation algorithm’s adaptability. A new contact model is proposed to be applicable in various materials, which includes both the Kelvin–Voigt model (KVM) and Hunt–Crossley model (HCM). An extra parameter is set in the model to express the capacity of continuous switching between KVM and HCM, whose rationality is proved based on the energy loss. The energy loss is proportional to a power of impact velocity, and the exponent is bounded at [2,3], which exactly lies between KVM and HCM. Furthermore, to estimate the parameters with a single-stage method, the nonlinear model is linearized approximatively with logarithm function and polynomials. Then, the recursive least squares (RLS) algorithm combining forgetting factor and self-perturbing action is designed to identify the four parameters online. Finally, the model’s continuous switching is verified with ideal simulation, and the model parameters are continuously changed without jumpy switch error. In the experiment, sponge, foam, and human hand represent the complex contact materials of the slave environment where the predicted force is shown to follow the real contact force with enough accuracy. Therefore, the virtual model can be considered the substitution of slave contact environment so that the feedback force in master can be calculated in real-time.

Development of a Teaching Model in Virtual Learning Environment to Enhance Computational Competencies in the 21st Century

In the 21<sup>st</sup> century, computing and other necessary skills have become imperative for today's learners. Memorizing a book or one-way communication is incapable of fully developing all the skills required. Along with changes in the new curriculum structure in the computational science courses which are aimed to improve computational thinking skills. In Thailand, students do not have enough experience in calculation methods. Teachers must therefore provide instruction in a format that promotes computational thinking and the skills necessary for the 21<sup>st</sup> century. The sample was 400 students from public and private schools in the same amount to develop the model, which was calculated based on the population of high school students throughout Bangkok, Thailand. It was found that the current learning model was unable to develop computational thinking concepts and 21<sup>st</sup> century skills. Therefore, the researchers have the concept of developing a teaching model that focuses on problem-solving along with the use of a design thinking approach in a virtual learning environment. To enable students with no experience with computational thinking skills to develop computational thinking skills to a competent standard. The objective is to also develop other skills, which are essential skills in the 21<sup>st</sup> century at the same time.

A Lean UX Process Model for Virtual Reality Environments Considering ADHD in Pupils at Elementary School in COVID-19 Contingency.

Today, the world is experiencing the COVID-19 health contingency, which prevents people from being exposed to one another and restricts physical contact. Under this context, the use of technology has become an essential tool to face the challenges of daily life, and virtual reality can be an alternative in the development of solutions that effectively support the acquisition of learning skills and knowledge transmission through the execution of tasks designed by multi-disciplinary groups. In addition, it can encourage the user to continue with the acquisition of learning skills in a friendly and fun way in a health and education context. This work proposes the use of virtual reality environments as an alternative to support the learning process in children with special educational needs such as Attention Deficit Hyperactivity Disorder (ADHD) and other associated disorders that occur in basic education. These proposed reality environments are designed under the Lean UX process model and their contents are designed according to expert therapeutic guidelines. As a result of this proposal, a case study is presented in which the user experience is evaluated through the use of an interactive environment to support the special educational needs of elementary school children attending an educational institution in Mexico.

Developing a Computer Simulation Game as a Training Tool for Mine Self-Escape in Underground Coal Mine

– Gaming technology has been growing these years rapidly. The game engines have the capability of creating a very realistic virtual environment model. This technology can also be used for mining purposes. In this research, the game engine is specifically used to develop a mine self-escape simulation game for training purposes. The game engine which is used to develop the simulation game is Unreal Engine 3. The main advantage of using such a simulation game as a training tool is because it allows the trainee to experience a dangerous situation while not being put in danger. This kind of training is considered better than conventional briefing, normally conducted by showing a video or pamphlet. Studies have shown that people retain more information when they are involved interactively in the learning process. In this research, a computer simulation game as a training tool for underground coal mine self-escaped has been successfully created using fire scenarios. The player/trainee should follow some procedures to get to the safety zone

Integration of Virtual Reality and Digital Human Model Simulations for Ergonomic Analysis of CAD Models

The paper deals the exercising Virtual Reality (VR) validation for ergonomic study of Computer Aided Design (CAD) virtual environment models, for the safe and comfortable operations for human. The CAD based virtual environments will subject to ergonomic analysis could reduce the costs of testing and errors in integration of sub systems compared to real-time trials. In this venture, a Digital Human Model Simulation (DHMS) was analysed in a workspace by incorporating VR simulation softwares. A transport and freight of military personnel and equipment in Armoured Personnel Carrier Vehicles (APVCs) model was employed as environment for ergonomic assessment. VR device with head-mounted display was used to perform the ergonomics analysis in virtual environment. The ergonomics study and the experience lead to changes in design features. This application could benefit in the defence, aerospace and naval sector, where ergonomically viable compact spaces for human inhabit of key importance.

Inteligência artificial em ambientes virtuais de ensino e aprendizagem: Uma proposta de modelo

Dentre as tecnologias que impactam a vida contemporânea, a Inteligência Artificial (IA) se destaca pela influência nas relações sociais e de produção em diversas áreas, tais como finanças, varejo, mobilidade, saúde e educação. Dentre essas, merecem destaque os Ambientes Virtuais de Ensino e Aprendizagem (AVEA), eles são utilizados como ferramentas didáticas e tecnológicas, se caracterizando por incorporar tecnologias ao longo da sua história. Este artigo teve o objetivo de propor um modelo de Ambiente Virtual de Ensino e Aprendizagem a partir da criação de agentes inteligentes que irão atuar como suporte e sensores para as etapas de ensino e aprendizagem. Contribuindo para avançar na solução da questão: como as técnicas de Inteligência Artificial, quando incorporadas em AVEAs, podem agregar valor no processo de ensino e aprendizagem aumentando a interação entre os agentes? Qualificada como um estudo de abordagem qualitativa, orientado a processos fenomenológicos com objetivo exploratório utilizando técnicas documentais, a pesquisa seguiu um percurso metodológico considerando a realização de revisão de literatura que contribuiu para construção do estado da arte, seguida da aplicação de técnicas de pesquisa, coleta e análise de dados que contribuíram para fundamentar a construção do modelo proposto e posterior validação com especialistas. Ao final, foi possível estruturar o modelo de AVEA com técnicas de IA que poderá agregar valor às relações de ensino e aprendizagem, abrindo caminho para a ampliação da discussão junto a comunidade científica, bem como servir de referência para possível materialização da proposta.

Protection and Maintenance of Historical Buildings Based on Virtual Reality Technology

The continuous development of virtual reality technology has improved the production efficiency of various industries. The application of virtual reality technology in the protection and maintenance of historical buildings can provide relevant practitioners with new work directions. Based on previous work experience, this article summarizes the content of historical building protection based on virtual reality technology. Moreover, the author also discusses the protection and maintenance of historical buildings based on virtual reality technology from the following four aspects. It includes the maintenance characteristics, the specific conditions of the project, reasonable maintenance plans formulation, and three-dimensional virtual environment modeling.

RETRACTED: Indoor space art design based on immersive VR and embedded system

Indoor space systems are mainly used in outdoor environments, but indoor navigation systems are still under development. This article introduces indoor spatial analysis based on virtual reality to people who help in indoor environments. Work is done with the mechanisms and methods used for storage, dynamic reconstruction, and navigation in 3D virtual space using databases. The characteristics of the room are shown in the database table. The proposed Virtual Reality Environment Modeling (VREM) method is used to create a 3D image to analyze the room space. The client browser requests the virtual world through the server that provides the URL. The selected virtual world and server virtual format is returned to the client. The new 3D simulation embedded system is used to act as an agent for the behavior of simulation embedded system and other objects on the Internet and their associated syntactic structures. This method is first applied to the forward transform 3D to enhance the virtual and reconstructed images of the discrete cosine transform. Effectively view large virtual worlds and easily modify them. The size, shape, or other aspects of the virtual world's elements can be changed by changing the data in the database. Finally, virtual block matching algorithms are applied to analyze virtual indoor components or objects to provide better results than existing methods.

Autonomous Snake Robot with Serpentine type Navigation

Biological snakes can easily maneuver through complex and undulating terrains which gives the motivation to create a bio mimic robotic snake which can easily slither through narrow spaces and uneven surfaces unlike the wheeled or legged mechanisms that have terrain limitations for its maneuverability. Such robots can be used in rescue operations in earthquake areas where it can easily crawl, surveillance and maintenance of complex or dangerous structures like pipelines in nuclear power plants. In this paper we discuss the development of autonomous snake robot with serpentine type navigation. The paper discusses in detail about the design of the robot, mathematical modelling, and motion study in virtual environment using MATLAB. The paper also discusses the controlling of the robot using Arduino Nano. The aim of the project is to develop a bio mimic snake which can maneuver over any terrains.