Search results for "Virtual"

Inertial response of isolated power networks with wind power plants

2019

The constant increase of power generation provided by renewable energy source (RES) power plants is causing a progressive reduction of the overall inertia of the power systems. Especially in the case of small, isolated power networks, the replacement of conventional generation plants with RES power plants can affect significantly the frequency response of the system. The critical low-inertia conditions can be improved by the introduction of specific additional controls to the RES power converters. These control schemes are known as “synthetic inertia” or “virtual inertia” controls. The paper analyzes the impact of a derivative-based inertial control on a small, isolated power system, with a…

Inflation in a virtual economy – a real or virtual threat?

2014

The aim of the paper is an analysis of the way and circumstances under which inflation can occur in a virtual economy. It is also an attempt to answer the question whether, and in what way virtual inflation may be related to inflation in the real economy. The article is conceptual, because in the present state of statistical data the effects of virtual economies are not carried out, or are generated in a very small number, which makes it impossible to make reliable calculations

Navigating uncharted waters: Designing business models for virtual and augmented reality companies in the medical industry

2021

Abstract New technologies are at the heart of industry transformation. Virtual and augmented reality companies provide fundamentally new ways of communication, treatment, education, and specialist training within the medical industry. However, business models for new ventures that target the medical industry have received scant attention within academic research. Using a multiple case study approach, we analyze how virtual and augmented reality firms create value for their customers in the medical industry. In all, we have studied eight companies that offer different types of solutions for their target segments. The results of the analysis are four design elements consisting of twelve posit…

2016

The Evolution of Blockchain Virtual Machine Architecture Towards an Enterprise Usage Perspective

2019

Virtualization in the context of blockchain systems represents an essential phase in the development and migration of services from public chains to enterprise logic. Most of the ongoing blockchain uses-cases are using the existing public ledgers, but for business products and services, there is a need for custom tailored solutions to ensure flexibility and security. The Ethereum Virtual Machine has opened new ways to solve problems that require a public proof by executing logic on a decentralized ecosystem. In a natural evolutive process, virtualization logic was shaped by numerous architectures and business requirements. Beside performance and scalability, enterprise virtual machines are …

File system scalability with highly decentralized metadata on independent storage devices

2016

This paper discusses using hard drives that integrate a key-value interface and network access in the actual drive hardware (Kinetic storage platform) to supply file system functionality in a large scale environment. Taking advantage of higher-level functionality to handle metadata on the drives themselves, a serverless system architecture is proposed. Skipping path component traversal during the lookup operation is the key technique discussed in this paper to avoid performance degradation with highly decentralized metadata. Scalability implications are reviewed based on a fuse file system implementation. Peer Reviewed

Pseudo-haptic Controls for Mid-air Finger-based Menu Interaction

2019

Virtual Reality (VR) is more accessible than ever these days. While topics like performance, motion sickness and presence are well investigated, basic topics as VR User Interfaces (UIs) for menu control are lagging far behind. A major issue is the absence of haptic feedback and naturalness, especially when considering mid-air finger-based interaction in VR, when "grabbable" controllers are not available. In this work, we present and compare the following two visual approaches to mid-air finger-based menu control in VR environments: a planar UI similar to common 2D desktop UIs, and a pseudo-haptic UI based on physical metaphors. The results show that the pseudo-haptic UI performs better in t…

Serious Games to Teach Nutrition Education to Children Between 9 to 12 Years Old. Pickit! and Cookit!

2016

The current trend of increase in children obesity is worrying governments around the world and urgent actions are requested. The promotion of Nutrition Education in early stages has shown to be a factor to prevent the gain of weight in children. A tool that is gaining popularity in teaching contents to children are the Serious Games. The objective of this paper is to describe two Serious Games, Pickit! and Cookit! that has as objective to teach Nutrition Education to children between 9 to 12 years old. These games form part of the Modifying Eating and Attitudes through Learning platform, a pedagogical tool created for nutritionists and primary school teachers to transfer nutritional knowled…

Bibliotēka un sabiedrība, 2

1997

Krājumā ievietoti raksti, kuros aplūkoti jauni virzieni informācijas izplatībā un bibliotēku darbībā. Atsevišķos rakstos analizētas vēsturiskas parādības. To attīstības likumības var sniegt jaunu izpratni mūsdienu norisēm. Krājumā ietverti pēc tematikas atšķirīgi raksti. Tomēr tos vieno autoru ieinteresētība sekmēt informācijas izplatību sabiedrībā.

Uso de la Realidad Virtual en Educación: un análisis bibliométrico

2022

Virtual Reality includes different technologies through which a user can experience a virtual world created in 3 dimensions by computer. Although its adoption has been slow, since the devices required to access virtual reality were expensive, there have been experiences in education since the 1990s. The present study carries out a bibliometric study in which 1074 articles related to the use of virtual reality in education from 1990 to the beginning of 2021 have been analyzed. It has been studied, from a quantitative point of view, the evolution of the annual scientific production, collaboration and production of authors, nationalities and sources of the articles. An analysis of citations, c…