From Things to Services: A Social IoT Approach for Tourist Service Management

In the context of Internet of Things (IoT), the cooperation and synergy between varied and disparate communicating objects is strained by trustworthiness, confidentiality and interoperability concerns. These restrictions can limit the development of IoT-based applications especially considering the emergent boost in the number of communicating objects and their growing itinerant nature in a collective service context. A new perspective arises with the paradigm of Social Internet of Things (SIoT), that relies on the implementation of semi-independent communicating objects with cooperation assessed by social relations and social feed-back. In this article, we present the development and expansion of the IoT concept towards SIoT in the context of the interactions between tourist services as communicating objects. As a proof-of-concept we propose a composition of services as virtualized social objects and the interaction between them, by taking into consideration the balance, trustworthiness, cooperation and synergy of services. Furthermore we present a solution to integrate also accessibility in SIoT services. The presented concept is presented using a demonstrator build for tourist services

Eguchi-Hanson Solitons in Odd Dimensions

We present a new class of solutions in odd dimensions to Einstein's equations containing either a positive or negative cosmological constant. These solutions resemble the even-dimensional Eguchi-Hanson-(A)dS metrics, with the added feature of having Lorentzian signatures. They are asymptotic to (A)dS$_{d+1}/Z_p$. In the AdS case their energy is negative relative to that of pure AdS. We present perturbative evidence in 5 dimensions that such metrics are the states of lowest energy in their asymptotic class, and present a conjecture that this is generally true for all such metrics. In the dS case these solutions have a cosmological horizon. We show that their mass at future infinity is less than that of pure dS.Comment: 26 pages, Late

Quasilocal formalism and thermodynamics of asymptotically flat black objects

We study the properties of 5-dimensional black objects by using the renormalized boundary stress-tensor for locally asymptotically flat spacetimes. This provides a more refined form of the quasilocal formalism which is useful for a holographic interpretation of asymptotically flat gravity. We apply this technique to examine the thermodynamic properties of black holes, black rings, and black strings. The advantage of using this method is that we can go beyond the `thin ring' approximation and compute the boundary stress tensor for any general (thin or fat) black ring solution. We argue that the boundary stress tensor encodes the necessarily information to distinguish between black objects with different horizon topologies in the bulk. We also study in detail the susy black ring and clarify the relation between the asymptotic charges and the charges defined at the horizon. Furthermore, we obtain the balance condition for `thin' dipole black rings.Comment: v2 clarifications on the advantage of using quasilocal formalism for black rings added, CQG versio

Hot Halos and Galactic Glasses

We initiate a systematic study of the state space of non-extremal, stationary black hole bound states in four-dimensional N = 2 supergravity. Specifically, we show that an exponential multitude of classically stable "halo" bound states can be formed between large finite temperature D4-D0 black hole cores and much smaller, arbitrarily charged black holes at the same temperature. We map out in full the regions of existence for thermodynamically stable and metastable bound states in terms of the core's charges and temperature, as well as the region of stability of the core itself. Several features of these systems, such as a macroscopic configurational entropy and exponential relaxation timescales, are similar to those of the extended family of glasses. We draw parallels between the two with a view toward understanding complex systems in fundamental physics.Comment: 29 pages, 5 figures, v2: typos corrected, references adde

Blockchain-Based Recommendation and Advertisement System for the TV Ecosystem

The TV environment has evolved rapidly in the past few years from a linear, broadcasting-oriented environment to a highly complex eco-system in which the combination of classic broadcasting technologies, IP-TV, Video on Demand and OTT services is combined with the new features of the smart TVs, all in a user-centric manner. As such, recommendation and advertisement services are among the most important services nowadays for the TV ecosystem, heavily relying on user data. In this context, collecting, processing and storing user data comes with a series of issues in terms of privacy, security and ownership. This paper addresses these issues by proposing a blockchain-based decentralized end-to-end solution for recommendation and advertisement services for the TV ecosystem

CLINICAL AND HISTOPATHOLOGICAL CONSIDERATIONS ON THE HALLOPEAU-SIEMENS DISEASE (RDEB-HS) –A CASE REPORT

Epidermolysis bullosa is a group of genetically transmitted rare conditions characterized by tegumentary fragility, lesions on oral mucosa and dental caries. This autosomal disease includes three types of manifestations depending on the histopathological location of the lesions: simplex type-intraepidermic, jonctional – at the epidermis limit and distrophic – going beyond the structure of the dermis. Epidermolysis bullosa also includes the autosomal recessive subtype or Hallopeau-Siemens disease (RDEB-HS) characterized by severe oral mucosal lesions, such as blisters, ulcerations, scars, triggered by minor trauma (mastication of solid food). Oral cavity lesions vary in severity and frequency, ranging from small vesicles and up to eroding bullas, leaving large ulcerative areas in mucosa. The consequence is the appearance of sclero-atrophic scars in oral mucosa, resulting in a size reduction of the oral vestibule, ankyloglossy, microstomia, the occurrence of esophageal, pharyngeal or even malignant degeneration of residual lesions. In the dental tissues, the disease is manifested by the predisposition to the appearance of carious lesions, or enamel mineralization defects – imperfect amelogenesis. Material and method: This study analyzes, using clinical and histopathological criteria, the case of an 11-year-old patient diagnosed with Hallopeau-Siemens dystrophic epidermolysis bullosa. In this context, the authors investigated both tegumentary and oral cavity lesions. Results: The extraoral clinical examination reveals the presence of multiple vesicular-bullous lesions located all over the tegumentary surface, including the cephalic extremity, followed by the occurrence of synechiae scars, accompanied in the upper limbs by pseudo-syndactilia. Intraoral clinical examination reveals mucosal lesions with variable fluid contents located on the keratinized areas (the attached gum, the dorsal face of the tongue), as well as on the non-keratinized mucosa (jugal, floor of the mouth). The patient also has multiple coronary odontal lesions affecting both temporary and definitive dentition and poor oral hygiene. Conclusions: Understanding the lesion formation and manifestation mechanism, its evolution and method of healing is a priority in the treatment of patients with dystrophic epidermolysis bullosa, both for the dentist and the dento-alveolar surgeon. The tissue fragility of the oral mucosa, as well as the predisposition to the appearance of carious lesions and dental dystrophies require a specific approach to the patient in establishing the correct therapy management

Enhanced Resource Management for Web Based Thin Clients Using Cross-Platform Progressive Offline Capabilities

Web based thin clients are applications delivering content from the Internet or Intranet and accessed via the browser on the running end device. These clients are portable and cross-device compatible and have a large spectrum of applications, can perform from tele-measurement tasks to management and information centralization. The capability of web-based thin clients to function offline is a requirement that is indispensable even today for many companies because offline-enabled thin clients allow the users to continue working without workflow disturbance, preventing the loss of data, even when the connection to the Internet is missing or malfunctioning. This paper is dedicated to a “barrier-free” cross-platform responsive and progressive web based thin client, presenting its architecture and development, as well as the offline capabilities using caching techniques and its advantages in resource management and information back-up and security