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Publications

2019

Key Distribution Protocol for Industrial Internet of Things Without Implicit Certificates

Authors
Eldefrawy, MH; Pereira, N; Gidlund, M;

Publication
IEEE INTERNET OF THINGS JOURNAL

Abstract
The deployment of the Internet of Things (IoT) in industry, called the Industrial IoT (IIoT), is supporting the introduction of very desirable improvements, such as increasing production flexibility, self-organization, and real-time and quick response to events. However, security and privacy challenges are still to be well addressed. The IIoT requires different properties to achieve secure and reliable systems and these requirements create extra challenges considering the limited processing and communication power available to IIoT field devices. In this research article, we present a key distribution protocol for IIoT that is computationally and communicationally lightweight (requires a single message exchange) and handles node addition and revocation, as well as fast rekeying. The scheme can also resist the consequences of node capture attacks (we assume that captured nodes can be detected by the gateway and previous works have shown this assumption to be acceptable in practice), server impersonation attacks and provides forward/backward secrecy. We show formally the correctness of our protocol and evaluate its energy consumption under realistic scenarios using a real embedded platform compared to previous state-of-theart key-exchange protocols, to show our protocol reliability for IIoT.

2019

Other Applications of Optical Clearing Agents

Authors
Oliveira, LMC; Tuchin, VV;

Publication
SpringerBriefs in Physics

Abstract
In this chapter, other areas of application for optical clearing agents (OCAs) are presented. The osmotic properties of agents are highly important in dermatology, cosmetics, and pharmacology, if topical application to the skin is desired. After addressing this application in Sect. 8.2, tissue poisoning and discussing the osmotic properties of certain poisons or toxic compounds will be done in Sect. 8.3. The importance of evaluating the diffusion properties of those substances in the skin, eye, and other inner tissue is indicated as a tool for optimizing treatment or decontamination dosage and procedures. Section 8.4 is used to discuss the application of agents in food industry. The dehydration capabilities of certain agents, such as sodium chloride or glycerol, are presented, and the advantages of treating fruit, meat, or fish with sugars to improve their organoleptic properties during preservation are also presented. Finally, the application of OCAs for tissue or organ preservation is presented in Sect. 8.5, where some cases for preservation of eye tissues at room temperature made with glycerol will be discussed. The use of OCAs as cryoprotectants at low temperatures is also explained. In all these applications, we refer the applicability of the method described in Sect. 6.4 to evaluate the diffusion properties of water, poisons, or drugs for ex vivo tissue samples. © 2019, The Author(s), under exclusive license to Springer Nature Switzerland AG.

2019

A evolução da ciência em Portugal (1987-2016)

Authors
Elizabeth Sousa Vieira; João Mesquita; Jorge Miguel Barros da Silva; Raquel Vasconcelos; Joana Torres; Sylwia Bugla; Fernando Silva; Ester A Serrao; Nuno Ferrand;

Publication

Abstract

2019

Simulating N-body systems for alternative theories of gravity using solvers from nonlocal optics

Authors
Ferreira, TD; Silva, NA; Bertolami, O; Gomes, C; Guerreiro, A;

Publication
FOURTH INTERNATIONAL CONFERENCE ON APPLICATIONS OF OPTICS AND PHOTONICS

Abstract
This paper reports the development of a numerical module for the HiLight simulation platform dedicated to the propagation of light in nonlocal nonlinear optical media and the adaptions implemented for it to be used as a numerical test-bed to evaluate the impact of new extensions of the Theory of General Relativity in the dynamics of a N-body system. The phenomenology of light in nonlocal and nonlinear media is very rich and can be described by a multitude of effective models, with different levels of detail and approximations, which coincide with few or no differences with those found in many other fields of physics. In particular, nonlocal extensions of the Generalized Nonlinear Schrodinger equation (also known as the generalized Schrodinger-Newton system) constitute a wide class of physical models that can be found in both optics and in the studies of alternative theories for gravity. Therefore, numerical solvers developed for the former can be adapted to address the later. Indeed, this paper discusses the adaptation of a numerical solver of the generalized Schrodinger-Newton system based on GPGPU supercomputing, initially developed to investigate the properties of light in exotic nonlocal media, to tackle the dynamics of large distributions of matter whose interaction is governed by extensions of the Theory of General Relativity, namely those based on non-minimal coupling between curvature and matter. This paper analysis the structure of the resulting simulation module, its performance and validation tests.

2019

Analysis of Project Management Practices Within the Textile and Clothing Industry

Authors
Silva, B; Tereso, A; Amaral, A;

Publication
EDUCATION EXCELLENCE AND INNOVATION MANAGEMENT THROUGH VISION 2020

Abstract
The common challenges faced by companies/industries are often related to the 'iron triangle' categories, namely: deadlines, budget, scope and quality. The Project Management knowledge area proposes a systematic approach to overcome these difficulties, with the purpose of acquiring new knowledge and skills, as well as by implementing methodologies, tools, processes and techniques. The textile and clothing industry, or fashion industry, is not immune to the same type of challenges. The products of the fashion chain are collections, which are developed according to market specifications, trends and market profiles. These specifications evolve very rapidly and, therefore, have their main objective in the development of new and/or innovative products. To deliver a new collection, the whole process of elaborating these products is executed based on a per project approach. Each collection is unique, having a well-defined beginning and end. The development of a fashion collection should consider the processes that, at the industrial level, will originate the final product, thus requiring a methodology that integrates the development of the project from the initial phase - conception of the product idea - until the final stage - start of production / launch to the market. By trying to identify project management approaches in the Portuguese textile and clothing industry, this study allowed us to conclude that, despite of these organizations considering as being developing or involved in projects, the approaches followed are not formal, structured and systematic. Furthermore, there is still no complete application of any of the known project management methodologies.

2019

Controlling the Optical Properties of Biological Materials

Authors
Oliveira, LMC; Tuchin, VV;

Publication
SpringerBriefs in Physics

Abstract
To overcome the high light-scattering problem that occurs in biological tissues, we present in this chapter the different clearing methods known today. Most of these methods have benefits and downsides, depending on the application for which they are used. The optical immersion method is introduced as a better, reliable, and reversible way to turn tissues clear. The major benefits and advantages of this method such as its reversibility, the lack of side effects, and application in large wavelength range will be presented. A description of the molecular diffusion of optical clearing agents is given to explain the reduction in the refractive index mismatch that natural tissues have. © 2019, The Author(s), under exclusive license to Springer Nature Switzerland AG.

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