Cultural Heritage (CH) refers to the representation of historical places and traditional customs of a specific city or country. Its principal aim is to transmit to future generations how their ancestors lived, and what their customs and buildings were like, etc. Nowadays, there are different technology systems and research investigations that are focused on CH education that use augmented reality (AR), virtual reality (VR), and mixed reality (MR). The aim of this document is to specifically identify if the use of AR improves students’ motivation to learn about topics related to CH. To this end, studies from different databases and specific journals, along with those concerning technology systems, were evaluated, and comparisons were made between them. Additionally, the aspects that should be considered in future research to improve student motivation and technology systems were identified.
In this paper, a network laboratory for distance learning of basic concepts in IP networking is presented. Through a web interface, students can choose various configurations of a real private network (number of routers and subnetworks, use of IPv4/IPv6, etc.), and learn about them using Linux network commands. The utilization of the virtual laboratory and how it is implemented are described.
Admission Control (AC) is an efficient way of dealing with congestion situations in a network. Using AC, when network resources in a path are not enough for all flows (i.e., during congestion), some of the flows receive the requested service and the rest do not. Congestion situations can be reduced by increasing network resources or by optimizing their use through better routing techniques, but if congestion still occurs, AC achieves efficient use of network resources by maximizing the number of satisfied flows. However, using AC complicates the network scheme, and therefore a major concern is making the AC as simple as possible. In this paper we review the main AC schemes that have been proposed for the Internet, focusing on the simplicity of their architectures in terms of the number of nodes that participate in the AC, the required state, the use of signaling, and others.
Internet applications such as web or ftp will be satisfactorily supported by a guaranteed minimum throughput service. We propose to build this service in a core-stateless network such as Differentiated Services with an Admission Control (AC) method based on end-to-end measurements, using the first packets of the flow. The whole scheme uses a small set of packet classes (with different discarding priorities), and is therefore simple and scalable. We evaluate the scheme through simulations in several scenarios using TCP flows. Finally, we propose an extension of the method aimed at improving its performance.
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