Detecting Impersonation Attacks in a Static WSN

The current state of security found in the IoT domain is highly flawed, a major problem being that the cryptographic keys used for authentication can be easily extracted and thus enable a myriad of impersonation attacks. In this MSc thesis a study is done of an authentication mechanism called device fingerprinting. It is a mechanism which can derive the identity of a device without relying on device identity credentials and thus detect credential-based impersonation attacks. A proof of concept has been produced to showcase how a fingerprinting system can be designed to function in a resource constrained IoT environment. A novel approach has been taken where several fingerprinting techniques have been combined through machine learning to improve the system’s ability to deduce the identity of a device. The proof of concept yields high performant results, indicating that fingerprinting techniques are a viable approach to achieve security in an IoT system

Thermodynamic modelling of the Cr–Fe–Ni–O system

There is a need to describe the influence of oxygen on high alloyed steels, both regarding oxidation processes – as in the formation of oxide layers – and regarding steel/slag processes in a metallurgical context. As a first step and in order to be able to perform calculations and simulations on these different processes, the thermodynamic properties need to be described, as done for the Cr–Fe–Ni–O system. Previous attempts to describe this system has resulted in an inconsistent description, more specifically concerning the spinel phase. The aim of the present study is to obtain a consistent thermodynamic database for the Cr–Fe–Ni–O system with an emphasis on the modelling of the spinel phase. The solid phases are described using the compound energy formalism and the metallic and ionized liquid is modelled using the ionic two-sublattice model. A complete list of all binary and higher order parameters is included

Calculations of thermophysical properties of cubic carbides and nitrides using the Debye–Grüneisen model

The thermal expansivities and heat capacities of MX (M = Ti, Zr, Hf, V, Nb, Ta; X = C, N) carbides and nitrides with NaCl structure were calculated using the Debye–Gru¨neisen model combined with ab initio calculations. Two different approximations for the Grüneisen parameter c were used in the Debye–Gru¨neisen model, i.e. the expressions proposed by Slater and by Dugdale and MacDonald. The thermal electronic contribution was evaluated from ab initio calculations of the electronic density of states. The calculated results were compared with CALPHAD assessments and experimental data. It was found that the calculations using the Dugdale–MacDonald c can account for most of the experimental data. By fitting experimental heat capacity and thermal expansivity data below the Debye temperatures, an estimation of Poisson’s ratio was obtained and Young’s and shear moduli were evaluated. In order to reach a reasonable agreement with experimental data, it was necessary to use the logarithmic averaged mass of the constituent atoms. The agreements between the calculated and the experimental values for the bulk and Young’s moduli are generally better than the agreement for shear modulus

Temperature dependence in interatomic potentials and an improved potential for Ti

The process of deriving an interatomic potentials represents an attempt to integrate out the electronic degrees of freedom from the full quantum description of a condensed matter system. In practice it is the derivatives of the interatomic potentials which are used in molecular dynamics, as a model for the forces on a system. These forces should be the derivative of the free energy of the electronic system, which includes contributions from the entropy of the electronic states. This free energy is weakly temperature dependent, and although this can be safely neglected in many cases there are some systems where the electronic entropy plays a significant role. Here a method is proposed to incorporate electronic entropy in the Sommerfeld approximation into empirical potentials. The method is applied as a correction to an existing potential for titanium. Thermal properties of the new model are calculated, and a simple method for fixing the melting point and solid-solid phase transition temperature for existing models fitted to zero temperature data is presented.Comment: CCP 201

Enhancing the person-centered care system through digital communication tools by applying a user-centered approach to a hospital environment

Digital technologies are becoming increasingly common tools in our daily lives. We use it for finding information, but also to communicate with people all over the world. With a vision to strengthen Swedish healthcare's digital resources, Sweden has made major efforts in this area. Improved living conditions have changed the demographic situation as people grow older, which in turn places higher demands on healthcare efficiency. Being able to meet these demands has made digitalization of healthcare increasingly important, but also demonstrating new challenges such as participation, transparency and usability. The purpose of this study has been to investigate if communicative tools can be created to facilitate nurses work with person-centred care and to enhance patients' positive experiences of their own care. The study is based on interviews and observations with nurses working within orthopaedic sections and employees working in facility management as well as administration within the hospital. The results show that digital solutions can be effective tools for enhancing person-centered care, but with automated solutions the physical encounter between nurses and patients can be reduced. The concepts that have been developed are two mobile applications. They were developed with the intention to make it easier for nurses to document and communicate patients' activity and care plans

Hej! Kan jag sända mitt privatliv till dig? - En kvalitativ studie om möjligheter och hinder för ett socialt ungdomsarbete på internet

Idag spenderar ungdomar en stor del av sin fritid på den ”nya” scenen internet. Uppsatsens syfte är att undersöka internet som möjlig arena för socialt ungdomsarbete. Utifrån ungdomars perspektiv belyses faktorer som är möjliggörande respektive hindrande för ett sådant arbete. Frågeställningar: Vilken betydelse har internet för ungdomars dagliga interaktion? Hur ser behovet ut av socialt ungdomsarbete på internet? Hur kan en relation till en socialarbetare skapas och fungera på internet? Tre fokusgruppsintervjuer har genomförts via MSN Messenger, där sammanlagt 12 ungdomar besvarade och diskuterade de aktuella frågorna. Analys av materialet genomfördes i en hermeneutisk spiral, kopplat till Giddens teorier om det högmoderna samhället samt till Goffmans dramaturgiska perspektiv. Resultaten visar att ungdomarna ser internet som en viktig arena för interaktion. Det finns både positiv- och negativ interaktion, såsom mobbing och ungdomarna är reflekterande över deras och andras aktiviteter på internet. Resultaten motiverar ett socialt ungdomsarbete på internet utifrån den problematik som återfinns där. Behov finns även utifrån ungdomars önskemål kring exempelvis lättillgänglighet och möjligheten att vara anonym. Dock finns hinder för en relation utan sinnesintryck samt en osäkerhet kring vem som sitter bakom skärmen. Viktigt för ungdomarna är även möjligheten att senare kunna träffas IRL. Riktigheten respektive ”oriktigheten” på internet blir ett centralt dilemma, liksom den fysiska närhetens för- och nackdelar

Enhancing the person-centered care system through digital communication tools by applying a user-centered approach to a hospital environment

Digital technologies are becoming increasingly common tools in our daily lives. We use it for finding information, but also to communicate with people all over the world. With a vision to strengthen Swedish healthcare's digital resources, Sweden has made major efforts in this area. Improved living conditions have changed the demographic situation as people grow older, which in turn places higher demands on healthcare efficiency. Being able to meet these demands has made digitalization of healthcare increasingly important, but also demonstrating new challenges such as participation, transparency and usability. The purpose of this study has been to investigate if communicative tools can be created to facilitate nurses work with person-centred care and to enhance patients' positive experiences of their own care. The study is based on interviews and observations with nurses working within orthopaedic sections and employees working in facility management as well as administration within the hospital. The results show that digital solutions can be effective tools for enhancing person-centered care, but with automated solutions the physical encounter between nurses and patients can be reduced. The concepts that have been developed are two mobile applications. They were developed with the intention to make it easier for nurses to document and communicate patients' activity and care plans

Creating a Framework for Consumer-Driven Contract Testing of Java APIs

Integration and unit testing is a critical part of most software development processes and, as such, demands for reliability, complexity of the tests as well as test execution time are important factors to consider when developing tests. This thesis explores the idea of designing and creating a testing framework based on the principles of testing by contract. It contains an example of how such a framework can be designed as well as a comparison between this design and traditional integration tests

Creating a Framework for Consumer-Driven Contract Testing of Java APIs

Integration and unit testing is a critical part of most software development processes and, as such, demands for reliability, complexity of the tests as well as test execution time are important factors to consider when developing tests. This thesis explores the idea of designing and creating a testing framework based on the principles of testing by contract. It contains an example of how such a framework can be designed as well as a comparison between this design and traditional integration tests