The rapid evolution of communication technologies and the emergence of sixth-generation (6G) networks have introduced unprecedented opportunities for ultra-reliable, low-latency, and energy-efficient communication. Integrating technologies like non-orthogonal multiple access (NOMA) and wireless powered communication networks (WPCNs) brings new challenges. These include energy constraints and increased security vulnerabilities. Traditional antenna systems and orthogonal multiple access schemes struggle to meet the increasing demands for performance and security in such environments. To address this gap, this paper investigates the impact of emerging fluid antenna systems (FAS) on the performance of physical layer security (PLS) in WPCNs. Specifically, we consider a scenario in which a transmitter, powered by a power beacon via an energy link, transmits confidential messages to legitimate FAS-aided users over information links while an external eavesdropper attempts to decode the transmitted signals. Additionally, users leverage the NOMA scheme, where the far user may also act as an internal eavesdropper. For the proposed model, we first derive the distributions of the equivalent channels at each node and subsequently obtain compact expressions for the secrecy outage probability (SOP) and average secrecy capacity (ASC), using the Gaussian quadrature methods. Our results reveal that incorporating the FAS for NOMA users, instead of the TAS, enhances the performance of the proposed secure WPCN.

Service creation and customization are expensive tasks: they require specialists for the creation of required software elements, while the knowledge for defining and using those services is owned by domain experts. In many cases, some of the usual basic services could be implemented by domain experts without any programming skills. In this, paper we present the prosumer service pattern (ProSP), which considers the characterization of the prosumer and enables them to manage the knowledge of the services. A ProSP behaves as a knowledge object defined through a problem–solution approach and allows the solving of specific problems in a prosumer framework. The proposal comprises a ProSP data model, a lifecycle for the patterns, a methodological approach that involves prosumers in framework provisioning and a tool to manage ProSPs through their life cycle. This tool is based on a cloud-hosted web solution and it is accessible from different devices (PCs, tablets and smartphones). An experimental validation, where 24 students of telecommunications and bioengineering participated, was carried out. Based on obtained results, the authors discuss the factors that affect the correct elicitation of knowledge about prosumer services, the service quality improvement using the ProSP approach and the evaluation of the ProSP model.

The video game industry is becoming increasingly important due to its revenues and growing capabilities. User eXperience (UX) is an important factor which contributes to the acceptance of a video game. The UX is usually assessed at the end of the development process, and for this reason it is difficult to ensure an adequate level of interactive experience between computer game and players. Cancelation of projects or even bankruptcy of a company can be caused by bad management of UX. In this paper, we propose the game experience management (GEM), a method to evaluate, manage, measure and track the UX from early stages of computer game development. In order to compare the proposal against a method comprised by conventional approaches, teams of master degree students were formed for developing six tower defense games for teaching basic multiplication operations; surveys were conducted to compare the UX of games. In this setting, we find that games developed with GEM significantly improve UX by increasing the puppetry and consequently reducing player frustration.

SUMMARY Software process improvement in software development organizations is a complex task that can be solved using knowledge management strategies. The definition and use of process patterns is a proven approach to apply knowledge management strategies in software engineering organizations. One of the main problems for the effective application of process patterns is the difficulty of formalizing the knowledge about the development process using these approaches. In this paper, a framework to manage software project patterns is presented. This framework is composed of a model called reusable project pattern (RPP) and a tool called sdpReuser. It is able to formalize the knowledge on software development projects from software development methodologies, reference frameworks, best practices and also tacit knowledge, useful to software engineers. The authors carried out a case study at the University Carlos III of Madrid, where junior software engineers used RPP. This study shows that the quality of pattern formalization correlates with experience in specific software engineering methods, the quality of the references in software engineering practices and the collaboration among software engineers to develop an RPP. It also analyzed the usefulness of RPP information elements to help software engineers to identify the most appropriate RPP and how to adapt it to project restrictions. Copyright © 2013 John Wiley & Sons, Ltd.

The reliability of a test collection is proportional to the number of queries it contains. But building a collection with many queries is expensive, so researchers have to find a balance between reliability and cost. Previous work on the measurement of test collection reliability relied on data-based approaches that contemplated random what if scenarios, and provided indicators such as swap rates and Kendall tau correlations. Generalizability Theory was proposed as an alternative founded on analysis of variance that provides reliability indicators based on statistical theory. However, these reliability indicators are hard to interpret in practice, because they do not correspond to well known indicators like Kendall tau correlation. We empirically established these relationships based on data from over 40 TREC collections, thus filling the gap in the practical interpretation of Generalizability Theory. We also review the computation of these indicators, and show that they are extremely dependent on the sample of systems and queries used, so much that the required number of queries to achieve a certain level of reliability can vary in orders of magnitude. We discuss the computation of confidence intervals for these statistics, providing a much more reliable tool to measure test collection reliability. Reflecting upon all these results, we review a wealth of TREC test collections, arguing that they are possibly not as reliable as generally accepted and that the common choice of 50 queries is insufficient even for stable rankings.

Previous research has suggested the permutation test as the theoretically optimal statistical significance test for IR evaluation, and advocated for the discontinuation of the Wilcoxon and sign tests. We present a large-scale study comprising nearly 60 million system comparisons showing that in practice the bootstrap, t-test and Wilcoxon test outperform the permutation test under different optimality criteria. We also show that actual error rates seem to be lower than the theoretically expected 5%, further confirming that we may actually be underestimating significance.

We describe a pilot experiment to update the program of an Information Retrieval course for Computer Science undergraduates. We have engaged the students in the development of a search engine from scratch, and they have been involved in the elaboration, also from scratch, of a complete test collection to evaluate their systems. With this methodology they get a whole vision of the Information Retrieval process as they would find it in a real-world setting, and their direct involvement in the evaluation makes them realize the importance of these laboratory experiments in Computer Science. We show that this methodology is indeed reliable and feasible, and so we plan on improving and keep using it in the next years, leading to a public repository of resources for Information Retrieval courses.