Virtual Solution Research Articles

Control of transient power compensation for virtual impedance VSG in Quasi-Z-source photovoltaic grid integration system

The virtual impedance solution effectively addresses the power coupling issues and improves small-signal stability in grid-connected Virtual Synchronous Generator (VSG) systems but can deteriorate the system's transient synchronous stability, particularly in high-voltage lines with significant line inductance exacerbating this effect. To address these contradictions, the paper first analyzes the power coupling mechanisms of the system, highlighting how the line reactance ratio (R/X) and power angle (δ) affect system stability, and describes the transient stability of VSGs using the equal area criterion. Leveraging the advantages of quasi-Z-source inverters, they are applied to VSG grid-connected systems, proposing an improved VSG control strategy tailored for quasi-Z-source photovoltaic grid-connected systems. This strategy introduces virtual active power at the point of common coupling (PCC) and uses it as power feedback in the control loop, instead of using real active power. The control model is validated on an experimental platform, demonstrating that the VSG control strategy with transient power compensation significantly enhances system transient stability while preserving small-signal stability. This comprehensive approach bridges the gap between maintaining essential stability functions and enhancing dynamic performance under various operational conditions.

A self-guided virtual reality solution for social anxiety: Results from a randomized controlled study

ObjectiveThe study examines the efficacy of a mobile application, oVRcome, which offers self-managed virtual reality exposure therapy combined with cognitive-behavioural techniques to treat social anxiety disorder. MethodsA randomized controlled trial (RCT) was conducted over six weeks with a waitlist delayed treatment group and follow-ups at 12 and 18 weeks. Participants were adults living in New Zealand with moderate to severe social anxiety disorder, as measured by the Liebowitz Social Anxiety Scale (LSAS). The primary focus was on the change in LSAS scores from baseline to the sixth week. All analyses utilized the intention-to-treat data. ResultsOut of 126 randomized participants, 81 completed the six-week follow-up. The retention rate at week 6 was 67.5%. The reduction in LSAS scores was significantly greater in the active group compared to the waitlist delayed treatment group (active group mean = −35.7 [SD = 24.0]; waitlist group: mean = − 2.2 [SD = 13.5]; p < 0.001), for an effect size of 1.8. ConclusionsThe study demonstrates that oVRcome can effectively reduce social anxiety symptoms, offering a viable self-guided treatment option. Trial registryClinicalTrials.gov ID NCT05576259.

The Effects of Physiotherapy Programmes, Aided by Virtual Reality Solutions, on Balance in Older Women: A Randomised Controlled Trial.

Background: Modern technologies are being applied to maintain and improve the functional performance of older adults. Fully immersive virtual reality (VR) combined with a scope of dual-task (DT) activities may effectively complement conventional physiotherapy programmes for seniors. The study aimed to compare the effectiveness of a fully immersive virtual reality (VR) environment combined with a scope of dual-task activities regarding balance in older women. Methods: Eighty women were recruited to the study protocol and, following randomisation, allocated to two equally sized groups, one pursuing conventional OTAGO exercises, the other one the VR-solutions-aided exercise programme combined with a scope of DT activities. Physiotherapy sessions spanned 6 weeks, each one lasting 60 min, three times a week, in both groups. Results: Homogeneity analysis of both study groups indicated no statistically significant differences at the first measurement point. After the intervention, both study groups achieved significantly improved scores on all tests. The VR + DT group obtained better results in dual-task gait and single-leg standing, whereas the greatest difference was observed during SLS CL (1.52 s vs. 2.33 s-difference 0.81 s 53.2% change, p = 0.001). The OTAGO group performed better in the TUG single-task gait (11.35 s vs. 12.60 s, p < 0.001) and in the Berg balance scale. Conclusions: The VR + DT training is effective in improving individual balance as well as in reducing fall risks. VR-assisted physiotherapy should complement conventional physiotherapy programmes (e.g., OTAGO). The benefits of applying VR solutions indicate that older women might well use this form of activity regularly under the guidance of a therapist or a family member.

BH, tech collaboration aims to transform telehealth, online group therapy

A behavioral health organization and a provider of virtual classrooms and online solutions have collaborated to offer patients evidence‐based mental health and addiction treatment through an interactive and online option. Officials, who announced the partnership in September, said the effort delivers personalized individual and group treatment plans in a secure, compliant and engaging online space.

Factors that influence the uptake of virtual care solutions in Australian primary care practice: a systematic scoping review.

Uptake of virtual care solutions in primary care settings has increased exponentially, and current evidence suggests high patient satisfaction but mixed clinician views. This paper aimed to identify factors influencing its' implementation to support delivery to the right patient, in the right clinical context, at the right time. Further, this paper evaluates how the updated Consolidated Framework for Implementation Research (CFIR) can be used to assess these factors that contribute to the uptake of virtual care innovations. This systematic scoping review identified empirical research on factors influencing the uptake of virtual care solutions in the Australian primary care setting. Searches were undertaken in Embase, PubMed, Scopus, and Web of Science. The CFIR was used to code factors influencing the implementation of virtual care solutions. Inductive coding was used to generate new constructs where no appropriate CFIR construct could be identified. Fourteen eligible studies were identified as eligible for inclusion. Five common influencing factors were identified. Three are from the existing CFIR framework, and two are newly developed constructs. CFIR constructs included innovation relative advantage, capability, and IT infrastructure. New constructs included accessibility and suitability. A further six new constructs were identified (trust, privacy, governance, unintended consequences, preference, and choice) but these were not prominently mentioned. Common factors influence virtual care uptake in Australian primary care. The CFIR assisted in conceptualizing these but was not sufficient for capturing factors unique to virtual care. Newly developed constructs are noted to be of importance in the literature, but further research is needed to understand whether they are applicable in multiple contexts. http://links.lww.com/IJEBH/A286.

Performance evaluation of designated containerization and virtualization solutions using a synthetic benchmark

The aim of this paper is the analysis of the performance of virtualization and containerization technologies in the context of IT infrastructure. The following virtualization technologies were selected for the study: VirtualBox, VMware and QEMU, as well as containerization technologies: Docker, Podman and LXD. In addition, microVM technologies such as QEMU and Firecracker, which are increasingly important in the context of virtualization, were also included. The comparative criteria on which the analysis is based include aspects of computing and memory performance. Tests conducted on selected technologies included testing CPU performance, RAM efficiency and disk speed for reading and writing data. A SysBench, synthetic benchmark, was used to conduct the tests.

Virtualization and energy management optimization of high speed computer network data centers based on optical switching and network technology

With the development of cloud computing and big data technology, the scale and complexity of data centers are increasing, and the thermal energy consumption management of computer processors can effectively improve the energy efficiency of data centers and reduce operating costs. Therefore, this study discusses the application of high-speed computer network architecture based on optical switching and network technology in data center virtualization. By constructing a high-speed computer network model based on optical switching technology, virtualization technology is used to dynamically schedule and manage resources, combined with real-time monitoring system, and the energy consumption data of the processor is collected. Using the data analysis method, the energy consumption performance under different load conditions is evaluated and the optimization strategy is proposed. The experimental results show that the network architecture using optical switching technology significantly reduces the latency of data center and improves the resource utilization. In the thermal management of the processor, dynamic resource scheduling successfully reduces the energy consumption and effectively maintains the stability and performance of the system. As a result, data center virtualization solutions based on optical switching and networking technologies can significantly optimize the power management of computer processors and improve overall energy efficiency.

The accounting of virtual robots

Purpose: The aim of the article is to present the principles and methods of measuring the activity of virtual robots. We link the identified metrics to analogies of perceiving a bot as a machine, an automated process, or a digital employee. The latest phenomenon of the anthropomorphization of bots receives special attention.Methodology/approach: We used text analysis of technical and marketing documentation as the research method. We conducted the analysis as a case study using the software of a leading international RPA (Robotic Process Automation) provider.Findings: The results lead to the following conclusions: accounting using bots is multidimensional, embedded in technology, and carried out in real time. The virtual robot accounting solutions avoid the analogy of virtual employees; measurement covers both bots and operators, and the representation of activities is incomplete and distorted.Research limitations/implications: The research was focused on subjective recommendations of the RPA technology provider, taking into account their marketing goals. Originality/value: The research shows that embedded measurement technology automates raw data collection and enables real-time accounting for both bots and their operators. It thus contributes to the development of hybrid accounting. Simultaneously, this technology has a constraining effect, distorting measurement and redefining well-known and well-established effectiveness metrics.

Virtual reality concerts: Determinants of success using the information system success model

As virtual reality (VR) technology advances, it has become a transformative tool for experiencing events without location, time, or capacity constraints. This development was particularly salient during the COVID-19 pandemic, accelerating the need for virtual event solutions. Despite the growing attention to VR in the event industry, research on the key drivers of successful VR events is lacking. The current study addresses this gap by developing and examining a conceptual model built on the information system success model to identify the determinants of VR concert success. Through empirical analysis, the study reveals that content, system, and service quality are pivotal to shaping attitudes toward VR applications and fostering continuance intention among VR concert attendees. These findings offer valuable insights for industry practitioners and provide a strategic framework to enhance user engagement and retention in VR events. Moreover, this research lays the groundwork for future explorations into VR efficiency in the broader context of virtual events.

Virtualization of Service Consumer Behavior in Poland – A Post-Pandemic Perspective

ABSTRACT This article explores the impact of the COVID-19 pandemic on the virtualization of consumer behaviors in the Polish service sector, emphasizing shifts in service delivery mechanisms. The pandemic acted as a catalyst, accelerating the adoption of virtual solutions across various sectors including tourism, gastronomy, culture, education, and healthcare, as necessitated by social distancing and other restrictive measures. The article first outlines the integration of digital solutions into various service sectors, focusing on the impact of these technologies on consumer behaviors and service delivery. Next, utilizing an online survey conducted in November 2022 with a sample of 1,100 respondents, whose socio-demographic profile corresponds with that of Polish internet users (Ariadna panel), the study examines consumer perceptions and the effectiveness of digital transformations during the pandemic. The findings indicate a high appreciation among Polish consumers for virtual solutions that improved access to and use of services during restrictive periods. However, the continuation of these virtual engagements post-pandemic appears selective, with significant inclination towards solutions in administrative, food delivery, and telemedical services, while long-term engagement in virtual cultural services is less favored. This study underscores the dual role of necessity and technological advancement in reshaping consumer interactions with service sectors, suggesting a sustained yet selective future for virtual service consumption post-pandemic.

Feedback to national medical commission regarding aadhar-enabled biometric attendance system at medical colleges in India.

Teachers are the backbone of any country, the pillars upon which all aspirations and dreams converge, if we paraphrase 11th President of India, Dr A P J Abdul Kalam,. A teacher of a Medical college has immense potential to shape the foundation and basic wisdom/ technical skills of a young student and resident. So, teachers' absence makes the learners bereft of these gifts- making them vulnerable to construct poor reasoning and judging clinical scenarios inappropriately: deriving incorrect or false interpretation from a given case presentation. For this reason, when the National Medical Commission (NMC) comes up and pushes for an idea ensuring physical presence of workforce at their respective workplaces, everyone should welcome the move. Nevertheless, like every fixture the virtual solution has its unique challenges, requiring nuances for proper assessment, demands reasoned and detailed dissection of actual ground -level situation; hence, I want the regulatory body to tweak the attendance -system to make it suitable for diverse atmosphere, varying working -conditions and rapidly -changing environment. Such formulation should have two- way communication channels between man (and woman) power as well as their regulators. Only then fine -tuning may be expected to be achieved to derive the maximum benefit while reducing chances of error/ omission/ glitch/ incompleteness and fault.

Elevating Security in Migration: An Enhanced Trusted Execution Environment-Based Generic Virtual Remote Attestation Scheme

Cloud computing, as the most widely applied and prominent domain of distributed systems, has brought numerous advantages to users, including high resource sharing efficiency, strong availability, and excellent scalability. However, the complexity of cloud computing environments also introduces various risks and challenges. In the current landscape with numerous cloud service providers and diverse hardware configurations in cloud environments, addressing challenges such as establishing trust chains, achieving general-purpose virtual remote attestation, and ensuring secure virtual machine migration becomes a crucial issue that traditional remote attestation architectures cannot adequately handle. Confronted with these issues in a heterogeneous multi-cloud environment, we present a targeted solution—a secure migration-enabled generic virtual remote attestation architecture based on improved TEE. We introduce a hardware trusted module to establish and bind with a Virtual Root of Trust (VRoT), addressing the challenge of trust chain establishment. Simultaneously, our architecture utilizes the VRoT within TEE to realize a general-purpose virtual remote attestation solution across heterogeneous hardware configurations. Furthermore, we design a controller deployed in the trusted domain to verify migration conditions, facilitate key exchange, and manage the migration process, ensuring the security and integrity of virtual machine migration. Lastly, we conduct rigorous experiments to measure the overhead and performance of our proposed remote attestation scheme and virtual machine secure migration process. The results unequivocally demonstrate that our architecture provides better generality and migration security with only marginal overhead compared to other traditional remote attestation solutions.

A Parallel Compression Pipeline for Improving GPU Virtualization Data Transfers.

GPUs are commonly used to accelerate the execution of applications in domains such as deep learning. Deep learning applications are applied to an increasing variety of scenarios, with edge computing being one of them. However, edge devices present severe computing power and energy limitations. In this context, the use of remote GPU virtualization solutions is an efficient way to address these concerns. Nevertheless, the limited network bandwidth might be an issue. This limitation can be alleviated by leveraging on-the-fly compression within the communication layer of remote GPU virtualization solutions. In this way, data exchanged with the remote GPU is transparently compressed before being transmitted, thus increasing network bandwidth in practice. In this paper, we present the implementation of a parallel compression pipeline designed to be used within remote GPU virtualization solutions. A thorough performance analysis shows that network bandwidth can be increased by a factor of up to 2×.

Falls Prevention Using AI and Remote Surveillance in Nursing Homes

The older population of United States is growing, with more adults having complicated medical conditions being admitted into nursing facilities and assisted living facilities. With the COVID-19 pandemic, the biggest challenge has been falls prevention, with an increasing number of patients being placed in their rooms under isolation. This has reduced nursing staff visits to the rooms, bringing up safety issues like falls. Many falls prevention programs have been tried and tested with this quality metric still posing a huge challenge in nursing facilities. The COVID 19 pandemic has given rise to new innovative technology and virtual solutions for prevention of falls. One such technology uses patient visuals through a camera in the patient's rooms and artificial intelligence to send alerts to staff. Such innovative technologies might be the future of falls prevention in the post-acute care, long-term care, and assisted living facilities.

Comparative Analysis of Non-Pneumatic Tire Spoke Designs for Off-Road Applications: A Smoothed Particle Hydrodynamics Perspective

This study explores the development of a terramechanics-based model for non-pneumatic tire–terrain interaction, focusing on different spoke designs. The research investigates how four spoke shapes (honeycomb, modified honeycomb, re-entrant honeycomb, and straight spokes) affect non-pneumatic tire performance in off-road conditions. Using the finite element method (FEM) to model non-pneumatic tires, and smoothed-particle hydrodynamics (SPH) to model dry, loose soil, simulations were conducted to replicate real-world loading conditions. This study utilizes virtual environment solution finite element analysis software to examine the interaction between a non-pneumatic tire and dry, loose soil, with a focus on calculating longitudinal and vertical forces. These forces play a pivotal role in determining the motion resistance coefficient. The results show distinct variations in the motion-resistance coefficients among the spoke designs on dry, loose soil. This analysis helps to identify the spoke configurations that optimize energy efficiency and fuel consumption. By comparing and evaluating the four spoke designs, this study shows the effect of spoke design on tire motion resistance. This study concluded that the modified honeycomb spoke design is the most stable and the least sensitive to operating conditions.

MODERNIZING REMOTE HIRING: IMPROVING EFFECTIVE RECRUITING WITH AI-POWERED VIRTUAL INTERVIEWS

Abstract – This study details the conception, creation, and assessment of a cutting-edge virtual interviewing tool intended to transform the interview procedure for a range of use cases, such as college applications and employment interviews. Using state-of-the-art technologies like Chat GPT, Node.js, React.js, AWS, and ASP. Net, C#, and Mongo DB, the application helps to cut down on administrative costs while streamlining the interview process and improving applicant experience and assessment. Due to the COVID-19 epidemic and the resulting rapid evolution of recruiting and recruitment procedures, virtual interview solutions have become necessary in order to support distant work and social distancing measures. Because of this shift, hiring procedures now use artificial intelligence (AI) and natural language processing (NLP) technology to reduce human bias and enable automated applicant evaluation. The online conversation Efficiency and user experience are given top priority in the application built for this project. Using an intuitive UI and smooth communication, applicants may participate in interactive interviews from the comfort of their homes. Both interviewers and candidates may save a significant amount of time by using the program to automate operations like arranging interviews, choosing questions, and rating candidates. An organized methodology is used in the development process, which includes phases for requirement analysis, design, development, testing, deployment, and assessment. User expectations and regulatory compliance are met by the program through incremental changes made possible by usability testing and stakeholder input gathering. The app’s ability to streamline conventional interview procedures and produce cost savings, greater applicant satisfaction, and efficiency are what make it significant. By demonstrating how cutting-edge technology are integrated and resolving legal and In light of ethical concerns, this study advances the domains of educational technology and staffing, opening the door for new developments. Keywords – The virtual interviewing tool utilizes Chat GPT for AI-driven interactions, Node.js for server-side operations, and React.js for a dynamic user interface. AWS provides scalable cloud infrastructure, while ASP.NET and C# manage application development and business logic. Mongo DB is the database solution, storing applicant data and interview information. Together, these technologies streamline the interview process, reduce administrative costs, and enhance applicant experience and assessment accuracy.

A Virtual Platform Solution for Secure Sales Registration and Management in the retail sector

Background In today’s business environment, information security and availability are critical to the success of SMEs. This article presents research that addresses the challenges of security and availability of information in sales registration faced by SMEs worldwide. The main objective was to implement a virtual platform for the sales process in SMEs in San Vicente de Cañete, taking into consideration information security standards to preserve user data. Methods The development of the system was divided into five phases: Initiation, Planning, Implementation, Review and Launch. After implementation, an efficient sales process was achieved, guaranteeing the security and availability of information, and optimising management in an agile and secure manner. Results In addition, the virtual platform improves the purchasing experience by allowing the generation of reports and revenue management through a dashboard, promoting the use of information and communication technologies (ICT) in SMEs. Conclusions In conclusion, the research implemented a virtual platform for sales in SMEs, ensuring the security and availability of information. It improved management with reports and a control panel, encouraging the use of ICTs in these companies.

Designing Virtual Coaching Solutions

Especially older persons are prone to disabilities and chronic diseases. These chronic conditions pose a worldwide challenge, leading to deteriorating health, economic strain, loss of life, and a decline in the quality of life (QoL). Therefore, healthcare institutions seek to enhance their strategies for disease prevention and management to uphold the well-being of the community. This leads to the need to regain independence and improve QoL to properly rehabilitate the patients. Virtual Coaches (VCs) in the form of Embodied Conversational Agents are seen as a relevant digital intervention to support the continuity of care. The paper at hand reports on a Design Science Research project about implementing a VC solution to support older patients' home rehabilitation. The study underpins four pivotal design principles: Adaptivity, Coaching Strategy, Multi-user Interface, and Sustainable Infrastructure. The final artifact was tested with 80 patients which were supported in continuing their inpatient rehabilitation at home by using a VC. The evaluation shows both positive results for usability and acceptance of the intervention for four different use cases and a positive impact on the QoL. Given the comprehensive clinical evaluation, the system represents a safe and appealing solution for ensuring the continuity of medical rehabilitation care and the access to personalized cognitive and motor function treatments.

Improving balance using augmented visual orientation cues: a proof of concept

Falls are a major health concern. Existing augmented reality (AR) and virtual reality solutions for fall prevention aim to improve balance in dedicated training sessions. We propose a novel AR prototype as an assistive wearable device to improve balance and prevent falls in daily life. We use a custom head-mounted display toolkit to present augmented visual orientation cues in the peripheral field of view. The cues provide a continuous space-stationary visual reference frame for balance control using the user’s tracked head position. In a proof of concept study, users performed a series of balance trials to test the effect of the displayed visual cues on body sway. Our results showed that body sway can be reduced with our device, indicating improved balance. We also showed that superimposed movements of the visual reference in forward-backward or sideways directions induce respective sway responses. This indicates a direction-specific balance integration of the displayed cues. Based on our findings, we conclude that artificially generated visual orientation cues using AR can improve balance and could possibly reduce fall risk.

Implementation of remote MRI scanning

The present shortage of MRI technologists continues to interfere with the delivery of care of patients. In addition, there have been limited solutions to cover disability, sickness, vacation, and personal days of that limited workforce. Our practice decided that the best way to address these coverage problems was to implement a virtual remote scanning solution. We explain the IT infrastructure, training and policies needed to implement this innovative solution safely and successfully to the MRI technologist shortage.