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Topic Review
Virtual LAN
A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). LAN is the abbreviation for local area network and in this context virtual refers to a physical object recreated and altered by additional logic. VLANs work by applying tags to network frames and handling these tags in networking systems – creating the appearance and functionality of network traffic that is physically on a single network but acts as if it is split between separate networks. In this way, VLANs can keep network applications separate despite being connected to the same physical network, and without requiring multiple sets of cabling and networking devices to be deployed. VLANs allow network administrators to group hosts together even if the hosts are not directly connected to the same network switch. Because VLAN membership can be configured through software, this can greatly simplify network design and deployment. Without VLANs, grouping hosts according to their resource needs the labor of relocating nodes or rewiring data links. VLANs allow devices that must be kept separate to share the cabling of a physical network and yet be prevented from directly interacting with one another. This managed sharing yields gains in simplicity, security, traffic management, and economy. For example, a VLAN can be used to separate traffic within a business based on individual users or groups of users or their roles (e.g. network administrators), or based on traffic characteristics (e.g. low-priority traffic prevented from impinging on the rest of the network's functioning). Many Internet hosting services use VLANs to separate customers' private zones from one other, allowing each customer's servers to be grouped in a single network segment no matter where the individual servers are located in the data center. Some precautions are needed to prevent traffic "escaping" from a given VLAN, an exploit known as VLAN hopping. To subdivide a network into VLANs, one configures network equipment. Simpler equipment might partition only each physical port (if even that), in which case each VLAN runs over a dedicated network cable. More sophisticated devices can mark frames through VLAN tagging, so that a single interconnect (trunk) may be used to transport data for multiple VLANs. Since VLANs share bandwidth, a VLAN trunk can use link aggregation, quality-of-service prioritization, or both to route data efficiently.
  • 379
  • 09 Oct 2022
Topic Review
Virtual Lab
VirtLAB is a Low-Cost Platform for Electronics Lab Experiments. The recent SARS-CoV2 pandemic has put a great challenge on university courses. Electronics teaching requires real laboratory experiences for students, which cannot be realized if access to physical infrastructures is prohibited. A possible solution would be to distribute to students, at home, electronics equipment suitable for laboratory experiments, but no reasonable product is currently available off-the-shelf.
  • 530
  • 22 Jul 2022
Topic Review
Virtual Heritage Dissemination and Immersive Learning
Lost architectural heritage refers to buildings, structures, or other physical features of the built environment that have been damaged or altered over time to such an extent that they are irretrievable through physical experience alone. This loss can occur for many reasons like neglect, disaster, demolition, or renovation works. Such heritage is commonly known to us through sparse sources of multiple and varied layers of the past that are often uncertain and contradictory. Each lost artifact uncovers cultural, social, and spiritual significances embedded within dynamic relations that are ambiguous from a contemporary mindset. 
  • 292
  • 18 Feb 2024
Topic Review
Virtual Forests Exposure
Numerous studies have confirmed the positive impacts of real forests in areas such as stress relief. However, not everyone can visit forests easily. Virtual technologies offer new ways of experiencing forests for people who are hindered by real-life conditions and provide researchers with a manageable mode of study. 
  • 172
  • 05 Jan 2024
Topic Review
Virtual Fencing Technology for Cattle Management
Maximizing annual pasture consumption without negatively impacting individual cow performance is of great importance in grass-based dairy and beef systems due to pasture being the most cost-effective nutrient source. However, the disadvantages of conventional and electric fencing include material and labor costs and increased manual labor. Virtual fencing has been developed and evaluated for almost two decades. The evolution of precision livestock farming, specifically virtual fencing, presents new opportunities for maximizing the utilization of available pasture land. Virtual fencing technology decreases the labor involved in physical fencing, provides greater adaptability to changes in pasture conditions, increases precision and efficiency, and offers additional flexibility in grazing management practices. However, that innovative technology should be further developed, and improvements should include decreasing the total costs of the system and increasing its application to other technological groups of ruminants, e.g., suckler cows with calves, increasing the efficiency of the system operation in large areas and a larger number of animals. 
  • 1.1K
  • 27 Feb 2023
Topic Review
Virtual Exercise and Training
The global internet (Internet of Things, IoT) and innovative information and communication technologies (IT/ICT) are already ubiquitous in the social and individual lives of people. Among them, a very significant role is played by Extended Reality (XR) and its classic components such as Virtual (VR), Augmented (AR) and Mixed (MR) Reality. There are many indications that these modern technologies (XR, i.e., VR/AR/MR, and 3D printing/scanning, holography, artificial intelligence and machine learning, robotics or online (VR) tele-medicine) will be the basis and determinants of the organization and functioning of contemporary and future generations.
  • 537
  • 12 Apr 2023
Topic Review
Virtual Exchange
Virtual exchange is a type of education program that uses technology to allow geographically-separated people to interact and communicate. This type of activity is most often situated in educational programs (but is also found in some youth organizations) in order to increase mutual understanding, global citizenship, digital literacies, and language learning. Models of virtual exchange are also known as telecollaboration, online intercultural exchange, globally networked teaching and learning, collaborative online international learning (COIL). Non-profit organizations such as Soliya (founded by Lucas Welch) and the Sharing Perspectives Foundation have designed and implement virtual exchange programs in partnership with universities and youth organizations. In 2017 the European Commission published a feasibility study into virtual exchange and in 2018 the Erasmus+ Virtual Exchange project was launched in Europe and Southern Mediterranean countries. Educational institutions such as State University of New York's COIL Center and DePaul University use virtual exchange in higher education curricula to connect young people globally with a primary mission to help them grow in their understanding of each other's contexts (society, government, education, religion, environment, gender issues, etc.).
  • 882
  • 21 Nov 2022
Topic Review
Virtual Electronics Laboratories in Education
Virtual reality or VR corresponds to a sensation, on the part of the user, of being physically present in a world that is not physical, through the use of images, sounds, and other stimuli created computationally for this purpose.
  • 331
  • 25 Jun 2023
Topic Review
Virtual Currency
Virtual currency, or virtual money, is a type of unregulated, digital money, which is issued and usually controlled by its developers and used and accepted among the members of a specific virtual community. The U.S. Commodity Futures Trading Commission has warned investors against pump and dump schemes that use virtual currencies. The Financial Crimes Enforcement Network (FinCEN), a bureau of the US Treasury, defined virtual currency in its guidance published in 2013. In 2014, the European Banking Authority defined virtual currency as "a digital representation of value that is neither issued by a central bank or a public authority, nor necessarily attached to a fiat currency, but is accepted by natural or legal persons as a means of payment and can be transferred, stored or traded electronically". By contrast, a digital currency that is issued by a central bank is defined as "central bank digital currency".
  • 1.3K
  • 20 Oct 2022
Topic Review
Virtual Coupling in Railways
The mobility situation is constantly changing as people are increasingly moving to urban areas. Therefore, a flexible mode of transport with high-capacity passenger trains and a high degree of modularity in the trains’ composition is necessary. Virtual coupling (VC) is a promising solution to this problem because it significantly increases the capacity of a line and provides a more flexible mode of operation than conventional signaling systems.
  • 803
  • 29 May 2023
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