IP Multimedia Subsystem (IMS) network presents a new generation in the telecommunication infrastructure by providing a variety of services whatever the used technologies. Therefore, to make the customers satisfied, their telecom operator provides them several services according to their attached user profile (subscription type). However, some services are not hosted by the home operator; the service providers are responsible to present these services to the customers. In this case, the operator contacts the concerned provider for requesting the access to the desired services. In fact, this access may arise some security issues which affect the customer privacy and the services security. In this paper,we project our approach, Tr-OrBAC, in the context of collaboration between service providers and telecom operators.We discuss the case when the customer wishes to access to a service hosted by an external service provider. We present the encountered security problems. Then, we depict and we detail the functioning of our approach to resolve these problems.
Smartphones have become a new means of communication and a major method of obtaining information. Dependence on or the excessive use of smartphones may affect health in the long term. However, little attention has been focused on smartphone use and dependence among undergraduates. Therefore, this study investigated the smartphone use behavior of Taiwanese undergraduates and their dependence on smartphones. A cross-sectional study design with a structured questionnaire was used for undergraduates aged≥20 years from four universities. The results suggested that the majority of participants, particularly women, experienced physical discomfort caused by smartphone use. Moreover, the participants exhibited a moderate to high dependence on smartphones. Smartphone use and dependence were both affected by family economic status, monthly allowance, and major. The findings indicated that health care providers, educators, and parents can play critical roles in encouraging the healthy use of smartphones among undergraduates.
Source routing (SR) minimum cost forwarding (MCF) – SRMCF – is a reactive, energy-efficient routing protocol proposed to improve the existent MCF methods utilized in heterogeneous wireless sensor networks (WSN). This paper presents an analytical analysis with experimental support that demonstrates the effectiveness of the proposed protocol. SRMCF stems from SR concepts and MCF methods exploited in ad hoc WSNs, where all unicast communications (between sensor nodes and the base station, or vice versa) use minimum cost paths. The protocol utilized in the present work was updated and now also handles link and node failures. Theoretical analysis and simulations show that the final protocol exhibits better throughput and energy consumption than MCF. Memory requirements for the routing table in the base station are also analyzed. Experimental results in a real scenario were obtained for implementations of both protocols, MCF and SRMCF, deployed in a small network of TelosB motes. Results show that SRMCF presents a 33% higher throughput and 24% less energy consumption than MCF. Extensive simulations for larger networks of MICAz and TelosB motes confirm the theoretical analysis. The impact of using SRMCF with two different MAC protocols, Berkeley-MAC and ContikiMac, is also evaluated by simulation, and the latter setup was also verified experimentally.
finding a trade-off between trained sales people maximization and training cost minimization) is best compared to the current optimization method applied by the company (only maximizing the number of trained sales people) or indeed linear programming to solely minimize the training cost.The application of MOLP provides 3% less trained sales people compared to the current optimization method applied by the company and reduces the training cost by up to 19.8%.
The rapid development of services based on distributed architectures is now emerging as important items that transform mode of communication, and the exponential growth of the Web makes a strong pressure on technologies, for a regular improvement of performance, so it's irresistible to use distributed architectures and techniques for the search and information retrieval on the Web, to provide more relevant search result, in minimum possible time. This paper discuss some solutions researchers are working on, to make search engines more faster and more intelligent, specifically by considering the semantic context of users and documents, and the use of distributed architectures. This paper also presents the overall architecture of GENAUM; the collaborative, semantic and distributed search engine, based on a network of agents, which is the core part of the system. The functionality of GENAUM is spread across multiple agents, to fulfill user's performance expectations. At the end of this paper, some preliminary experimental results are presented, that attempts to test the user modeling process of GENAUM, using reference ontology.
