The focus on sustainability has become more noticeable during recent years. This is especially evident in the Nordics, were Sweden, Norway, Denmark and Finland tops the sustainability rankings. Moreover, several studies have been conducted surrounding the topic of the sustainability measuring ESG-scores and their relation to financial performance. Simultaneously, researchers have come up with controversial findings regarding the relationship between financial performance and executive compensation. This study aims to find out the relationship between sustainability and senior executive compensation in the Nordics, as well as how they are both connected to financial performance. In order to fulfill this, eight multiple regression models were created on a sample of 101 Nordic companies. The chosen dependent and independent variables comprised various ESG-scores, as well as a ratio of senior executive compensation divided by total revenue. This resulted in 895 different observations during the years 2008 to 2017. This is a quantitative study following the positivist paradigm. Moreover, a deductive approach is taken in regard to how theory is used. Theories used to make conclusions include the stakeholder theory, the shareholder theory, the legitimacy theory, the agency theory and the stewardship theory. The regression models of choice were the OLS model and the OLS robust model, depending whether the models fulfilled the assumption regarding heteroscedasticity. The findings showed no significant relationship between the ESG combined score and the senior executive compensation ratio in the Nordics. However, a significant negative relationship between the compensation and the social and environmental scores could be found. Moreover, the governance-score was the only ESG-score to indicate a positive relationship with senior executive compensation. Conclusions could be made that there is a negative relationship between senior executive compensation and sustainability factors such as emission reduction and employment quality. This finding is in favor for the shareholders, but not the stakeholders. Additionally, there is a positive relationship between senior executive compensation and good governance. This includes factors such as a high score regarding board structure, shareholder rights and CSR strategy. It could also be concluded that good governance has an indirect positive impact on financial performance. Furthermore, the findings question previous arguments that executive compensation is an agency cost, rather than a solution of the agency problem.

Yes / Guided by academic literature, industry practice and policy recommendations, we analyze a wide range of option and restricted stock plans with exercise and vesting conditions that may be contingent on stock price performance. To assess the effectiveness of these plans at attracting and providing incentives to executives, we create compensation plans with fixed firm cost and executive valuation and calculate their expected total lifetime incentives. We show that performance vesting targets provide the least cost effective incentives, performance exercise targets provide the largest risk incentives, option plans are generally superior to restricted stock plans, and calendar vesting is only efficient up to a maximum of three years. Performance exercise targets can increase the expected total lifetime incentives provided by compensation plans, but in general, standard options with short vesting periods provide the most cost effective pay-for-performance incentives.

Motion and tilt have long hindered the accuracy, reliability, and response of magnetic detection systems. Perturbations in the magnetic field reading resulting from motion cause degradation of the output signal, compromising the performance and reliability of the magnetometer system. The purpose of this document is to describe the development, construction, and testing of a tilt-stabilized three-axis magnetic field sensor. The sensor is implemented as a three-axis general-purpose magnetic field sensor, with the additional capability of being implemented as a compass. Design and construction of system hardware is discussed, along with software development and implementation. Finite impulse response filters are designed and implemented in hardware to filter the acquired magnetic signals. Various designs of median filters are simulated and tested for smoothing inclination signal irregularities and noise. Trigonometric conversions necessary for tilt-compensation are calculated in software using traditional methods, as well as the Coordinate Rotation Digital Computer (CORDIC) algorithm. Both calculation methods are compared for execution time and efficiency. Successful incorporation of all design aspects leads to detection and output of stable earth magnetic fields, sinusoidal signals, and aperiodic signatures while the magnetometer system is subject to significant tilt motion. Optimized system execution time leads to a maximum detectable signal bandwidth of 410 Hz. Integration of azimuth angle calculation is incorporated and is successfully tested with minimal error, allowing the system to be used as a compass. Results of the compensated system tests are compared to non-compensated results to display system performance, including tilt-compensation effectiveness, noise attenuation, and operational speed. / Master of Science

Yes / This paper presents an improved mathematical model for calculation of distortion vectors of two aligned surface meshes. The model shows better accuracy when benchmarked to an existing model with exceptional mathematical conditions, such as sharp corners and small radii. The model was implemented into a developed distortion compensation digital tool and applied to an industrial component. The component was made of Inconel 718 and produced by laser powder bed fusion 3D printing technology. The digital tool was utilised to compensate the original design geometry by pre-distortion of its original geometry using the developed mathematical model. The distortion of an industrial component was reduced from approximately ±400 µm to ±100 µm for a challenging thin structure subjected to buckling during the build process.

This thesis is composed of three essays. The first essay studies price setting behavior by sales agents of an electrical wholesale company following a change in their compensation contract. Originally, agents received a fixed share of the revenues from their sales. Under the new scheme, commission rates increase with the price-cost margin of the sale. The reform was enacted at different times in different stores, enabling measurement of its impact by difference-in-differences. Commissions on 95% of goods increase but agents do not raise prices on all these products. Despite the stronger financial incentives, the price of 18% of goods decreases and increases for the rest, suggesting agents reallocate effort among products. The second essay explores the importance of employee-customer relationships as an incentive and price discriminating tool. The model assumes that customers differ in their valuations and in their probability of returning (q). The distribution of valuations and q are known, and in each interaction the sales agent exerts effort to learn the customer’s valuation. The agent earns a commission based on the client’s payment and has full pricing flexibility. The two main insights are that, when the valuation is unknown, effort is increasing in q and the effect of a commission raise has an inverted-U relation with customers’ probability of returning. Prices should be increasing in effort. Using administrative data from an electrical company, I show evidence supporting the theoretical insights. The third essay analyses the determinants of teachers’ occupational choice and how changes in financial incentives modify individuals’ occupation choices. Among college graduates, teachers have both low average Armed Forces Qualification Test scores (AFQT) and high average risk aversion. Using a dynamic optimization model with unobserved heterogeneity, we find that were it possible to make teacher compensation mimic the return to skills and riskiness of the non-teaching sector, overall compensation in teaching would increase. Moreover, such a shift would substantially reduce the utility of many current teachers, making the process of reform challenging. Importantly, the results of policy exercises are very sensitive to the degree of heterogeneity included in the model.

The SiC MOSFET has attracted interest due to its superior characteristics compared to its Si counterpart. Several SiC MOSFETs are usually paralleled to increase current capability, considering cost effectiveness and manufacturability. Current unbalance among the MOSFETs is a concern as it affects reliability. The two main causes are asymmetrical layout and parameter mismatch. The variation in parameters, unlike circuit or module layout, is unavoidable during production. Among all the parameters of MOSFET, the spreads in on-state resistance (Rds(on)) and threshold voltage (Vth) are the major concerns during paralleling. The disparity in Rds(on) causes static current unbalance which is self-limited due to the positive temperature coefficient of Rds(on). Its influence is not investigated here. The threshold voltage Vth has a negative temperature coefficient, forcing the MOSFET with lower Vth to carry more current during switching transient. Paralleled MOSFETs are usually de-rated to guarantee safe operation. Balancing of peak currents during switching transient isthe goal of this work. Integration of current/voltage sensors into paralleled structure is difficult in real application. Complicated feedback loop design and separate gate drivers also need to be avoided in perspective of cost and volume. Passive balancing solutions are investigated in this dissertation. The inductors and resistors most effective in improving current sharing are identified by parametric analysis. Their current balancing mechanisms are analyzed in circuit point of view. The design guidelines involving the magnitude of Vth mismatch, current rise time, and unbalance percentage are derived for the selection of passive components. The theory upholds well when substantial parasitics from device package and layout exist. Several passive balancing structures are analyzed and compared in terms of current balancing capability, voltage stress, total switching loss, and switching loss difference. All of them can provide much better current and power balancing without increasing switching loss. Some of the them may increase the stress-inducing inductance, which can be reduced by negative magnetic coupling. Perfect coupling between power-source inductors would enable current matching without penalty on voltage stress. Common-source inductance (Lcm) is effective in dynamic balancing, but at the expense of higher switching loss. It is not considered in power module application because Kelvin connection is normally applied. However, wire bond inside the package of discrete MOSFETs and part of the external leads are inevitable and add to Lcm. Peak-current and switching energy mismatches vary with operating conditions (including input voltage, input current, and switching speed). Design guidelines and procedures that are valid for wide operating range are provided for cases with and without Lcm. This dissertation also models the switching energy and switching energy mismatch of paralleled MOSFETs. The influence of operating conditions, passive balancing components, layout and package parasitic inductances, nonlinear channel performance, and voltage dependent parasitic capacitors are included in the modeling process. The resulting high order system is simplified by reducing the number of passive components and number of devices without losing accuracy. The influence of current balancing components and magnitude of threshold voltage mismatch on sharing are discussed based on modeling results. In conclusion, this dissertation balances the transient currents between paralleled SiC MOSFETs automatically by inductance, resistance and magnetic coupling. This procedure is done utilizing one gate driver without current/voltage sensors and feedback loop. Those solutions work for both polarities of Vth mismatch and force balancing from the first current peak. Design guidelines involving the magnitude of Vth mismatch, current rise time, and maximum peak-current difference are derived to guide the choice of passive components. The detail design procedures are recommended to force currents to share over wide operating range. The aforementioned benefits are demonstrated by two paralleled SiC MOSFETs (C2M0160120D) tested at variant operating conditions. The difference of peak currents can be reduced below 5% of steady-state current in every switching transient. Switching energy mismatch percentage can be reduced by 6 times without increasing total switching energy. / Ph. D. / This research focuses on balancing currents between paralleled SiC MOSFETs. Several SiC MOSFETs are usually paralleled to increase current capability. Current unbalance among MOSFETs caused by variation in parameters is a concern as it affects reliability. Several passive balancing structures are proposed in this dissertation. All of them can provide much better current and power sharing without great scarification of other switching performance. Severity of unbalance varies with operating conditions (including input voltage, input current, and switching speed). Design guidelines and procedures that are valid for a wide operating range are provided. This dissertation also models the switching energy and switching energy mismatch of paralleled MOSFETs. The resulting high order system is simplified by reducing the number of passive components and number of devices without losing accuracy. More findings are discussed based on modeling results. The effectiveness of passive balancing methods are demonstrated by two paralleled SiC MOSFETs tested at variant operating conditions. The difference of peak currents can be reduced below 5% of steady-state current in every switching transient. Switching energy mismatch percentage can be reduced by 6 times without increasing total switching energy.

This thesis presents the design, simulation, and evaluation of a passive, wearable, and human-scale actuator that includes pulleys and uses polymers for energy storage. Repetitive tasks such as packing boxes on an assembly line may require high strength movements of the shoulder, arm, and hand and may result in musculoskeletal disorders. With the objective to offset the weight of the arm and thereby lower the forces on the muscles in the shoulder and arm, this actuator is able to provide gravity compensation for the upper extremities of workers, if used in conjunction with an arm exoskeleton. The actuator is passive, meaning that it does not use motors or sensors, but instead creates a force on a cable that is a function of the displacement of the cable. This thesis details the design of the actuator and the selection of an appropriate polymer for use with the actuator. To determine the best polymer for this application, tests were conducted on nine polymers to ind their average Young's modulus and their hysteresis. A 90A abrasion-resistant polyurethane rubber belt was used in the final design due to its high modulus and low hysteresis. The final actuator design was tested in an Instron machine to validate its performance. During testing, the actuator provided 720N in extension and 530N in retraction, which are roughly 112% and 83% of the torque required to lift a human arm, respectively. / Master of Science / The development of industry increases productivity, and brings convenience to people’s life, but in the meantime it also increases work-related illnesses. Based on such condition, mechanical devices such as exoskeletons can be applied to support arms of wearer to perform tasks for longer durations and with less effort. In this thesis, we present a wearable actuator that contains pulleys and polymer belts. With rather light weight and small size, the actuator is located on the waist of wearer, and connected to the arm exoskeleton by cable. As the arm moves, the polymer belts within the actuator will be stretched and counteract the effects of movements. All in all, the design of the actuator must be portable, light-weight and with simple design that can be sufficient to meet actual requirements.

Cette thèse traite du mouvement respiratoire dans l'imagerie TEP/TDM. L'imagerie TEP est une modalité à exposition longue très influencée par les mouvements involontaires du patient. Ces mouvements produisent des artéfacts dont les conséquences sont sérieuses pour le diagnostic car les tumeurs paraissent plus larges et moins actives. Cette thèse contribue à la résolution de ce problème. En plus de proposer l'architecture d'un système d'acquisition TEP/TDM synchronisée à la respiration, on y développe trois méthodes de traitement de signal et d'images qui peuvent être appliquées pour résoudre différents sous-problèmes: Une méthode originale de segmentation et caractérisation du signal respiratoire pour découvrir les patterns respiratoires "normaux" du patient, une méthode de reconstruction TDM-4D qui permet d'obtenir des images anatomiques du corps à chaque niveau respiratoire désiré et un algorithme itératif amélioré pour reconstruire des images TEP-4D compensées en mouvement respiratoire. Toutes ces méthodes et algorithmes ont été validés et testés sur des données simulées, des données de fantômes, et des données réelles de patients. / This thesis deals with respiratory motion in PET/CT images. It is well known that PET is a modality that requires a long exposure time. During this time, patients moves and breath. These motions produce undesirable artefacts that alter seriously the images and their precision. This has important consequences when diagnosing thoracic, and particularly pulmonary, cancer. Tumours appear larger than they really are and their activity is weaker. This thesis proposes to contribute to solving these problems.We propose the architecture of an integrated PET/CT acquisition system synchronized to respiration. We also develop signal and image processing methods that can be applied to eliminating respiratory artefacts in CT and PET images. The thesis brings three main contributions : An original respiratory signal segmentation and characterization to detect "normal" respiratory patterns, a 4D-CT reconstruction method that creates 3D images of the whole body for any respiratory level and an enhanced iterative algorithm for reconstructing 4D-PET images without respiratory artefacts. The developed methods have validated and tested on simulated, phantom and real patients' data.

Le travail présenté dans ce mémoire s’est déroulé dans le cadre d’une collaboration entre le groupe Convertisseur Statique du laboratoire LAPLACE et le département " Installations Fixes de Traction Electrique " de la Direction de l’Ingénierie de la SNCF. Aujourd'hui, la majorité du trafic sur le réseau ferré monophasé 25 kV / 50 Hz est assurée par des locomotives équipées de redresseurs contrôlés à thyristors. Du fait de l'augmentation du trafic, l'utilisation de ces locomotives nécessite la mise en place de moyen de compensation de puissance réactive afin de maintenir la tension caténaire à un niveau acceptable et de réduire la facture en énergie réactive. La correction du facteur de déplacement est réalisée en partie par des batteries de compensation fixes dont lapuissance est limitée par la tension maximale admissible à vide sur la caténaire. Afin d’adapter le niveau de compensation à la consommation, la partie fixe est complétée par un dispositif réglable basé sur une réactance contrôlée par des thyristors. Bien qu’il soit simple dans son principe, ce dispositif nécessite un filtrage des harmoniques en basse fréquence avec des circuits LC volumineux. L’objectif de cette thèse est de proposer une nouvelle topologie de compensateur de puissance réactive à haut rendement et utilisant un contrôle à modulation de largeur d’impulsion dans le but de minimiser le volume des éléments de filtrage. La première partie de ce mémoire est consacrée à une étude comparative de différentes topologies du point de vue des pertes dans les semi-conducteurs et du dimensionnement des éléments de filtrage associés. Les résultats de cette étude montrent que les topologies à base de gradateurs MLI, constituent les solutions les plus intéressantes pour réaliser le compensateur. La deuxième partie du travail concerne l’étude de l’insertion d’un compensateur à base de gradateurs MLI sur le réseau ferré avec la prise en compte des interactions harmoniques. Le cas d’étude concerne une sous-station où doit être implantée une compensation variable de 3 MVAR. Un relevé des courants délivrés par la sous-station a été effectué dans le but d’analyser leur contenu harmonique. Une modélisation de la sous-station et du compensateur est ensuite proposée et des simulations temporelles de l’ensemble sont réalisées en prenant en compte les formes d’ondes réelles des courants absorbés par les trains. Finalement, cette étude par simulation permet d’affiner le dimensionnement du compensateur à gradateurs MLI et des éléments de filtrage associés. Elle met en évidence l’avantage d’une solution, avec des gradateurs MLI en montage élévateur de tension, qui fonctionne sans transformateur et réutilise les batteries de compensation fixes déjà installées en sous-station à la fois comme diviseur de tension et éléments de filtrage. Afin de valider le principe de cette nouvelle topologie de compensateur statique de puissance réactive, un démonstrateur de 1,2 MVAR est mis en oeuvre et testé sur une plateforme d'essai de la SNCF. / The work presented in this thesis is the result of collaboration between the Static Converters research group of LAPLACE Laboratory and the department "Installations Fixes de Traction Electrique" of the Engineering Division of the French Railways company, SNCF. Nowadays, most of the traffic in 25 kV – 50 Hz lines is achieved by old locomotives equipped with thyristor rectifiers. As traffic and load increase, reactive power compensation devices are required to keep the overhead line voltage at acceptable level and to reduce the spending for reactive power. The basic power factor correction is completed by fixed compensation banks. But the difficulty of such configuration is the no-load operation of overhead lines. The voltage can increase out of the 29 kV standard limit and to avoid this problem, variable reactive power compensator is often added to the fixed compensation banks. Nowadays, SNCF is equipped with thyristor based static VAR compensators (SVC). The main drawback of this topology is the requirement of a large LC shunt filter tuned for the third harmonic. The goal of this thesis is to find a new high-efficiency topology of STATic COMpensator (STATCOM) using PWM control to minimize the filtering components. The first part of this thesis focuses on a comparative study of different topologies in terms of semiconductor losses and filter elements size. The results of this study show that the topologies based on PWM AC Chopper are the most interesting solutions to achieve the compensator. The second part of the work concerns the influence of the connection of a STATCOM to a substation and focuses on the harmonic interactions with locomotives. The study case concerns a high traffic substation where a 3 MVAR STATCOM should be installed. Substation output current measurement was carried out in order to analyze its harmonic content. Models of the substation and the STATCOM are then proposed and simulations using real current waveforms are performed. Finally, this simulation study helps to refine the features of the AC Chopper topology and its filter elements. It highlights the advantage of a solution, with boost AC Choppers which operate without transformer and reuse the fixed compensation banks already installed in the substation as voltage divider and filter. To validate the principle of this new topology of STATCOM, a 1.2 MVAR prototype is built in LAPLACE laboratory and tested on a SNCF test platform.

La délégation du pouvoir de gestion aux administrateurs et aux gestionnaires, une caractéristique intrinsèque à la gestion efficace de grandes entreprises dans un contexte de capitalisme, confère une grande discrétion à l’équipe de direction. Cette discrétion, si elle n’est pas surveillée, peut mener à des comportements opportunistes envers la corporation, les actionnaires et les autres fournisseurs de capital qui n’ont pas de pouvoir de gestion. Les conflits entre ces deux classes d’agents peuvent émerger à la fois de décisions de gouvernance générale ou de transactions particulières (ie. offre publique d’achat). Dans les cas extrêmes, ces conflits peuvent mener à la faillite de la firme. Dans les cas plus typiques, ils mènent l’extraction de bénéfices privés pour les administrateurs et gestionnaires, l’expropriation des actionnaires, et des réductions de valeur pour la firme. Nous prenons le point de vue d’un petit actionnaire minoritaire pour explorer les méchanismes de gouvernance disponibles au Canada et aux États‐Unis. Après une synthèse dans la Partie 1 des théories sous‐jacentes à l’étude du pouvoir dans la corporation (séparation de la propriété et du contrôle et les conflits d’agence), nous concentrons notre analyse dans la Partie 2 sur les différents types de méchanismes (1) de gouvernance interne, (2) juridiques et (3) marchands, qui confèrent du pouvoir aux deux classes d’agents. Nous examinons comment les intérêts de ces deux classes peuvent être réalignés afin de prévenir et résoudre les conflits au sein de la firme. La Partie 3 explore un équilibre dynamique de pouvoir corporatif qui cherche à minimiser le potentiel d’opportunisme toute en préservant une quantité de discrétion suffisante pour la gestion efficace de la firme. Nous analysons des moyens pour renforcer les protections des actionnaires minoritaires et proposons un survol des pistes de réforme possibles. / The delegation of power to corporate directors and officers (Insiders), an essential trait of modern firm management in the context of capitalism, presents desirable efficiency advantages. However, it also confers broad discretion to Insiders . This discretion, when unchecked, may lead to self‐interested opportunistic behaviour detrimental to the firm and to the outside shareholders (Outsiders) who supply finance to the firm but do not have management power. Conflicts between Insiders and Outsiders may emerge from either general governance decisions or from particular transactions (ie. takeovers). In extreme cases, these conflicts can lead to the bankruptcy of the firm or, in more typical cases, to the extraction of private benefits for Insiders, shareholder expropriation and value‐reducing actions for the firm. We take the perspective of an outside shareholder to explore corporate governance mechanisms available in the US and Canada. After reviewing in Part 1 the core theories underlying the study of power in the modern corporation (separation of ownership and control and agency conflicts), we focus in Part 2 on the (1) internal governance, (2) regulatory and (3) market mechanisms through which both Insiders and Outsiders draw power. We examine how Outsiders can harness these mechanisms to check Insiders, as well as to prevent and resolve various types of conflicts. In Part 3, we explore a corporate power equilibrium that helps to minimize Insider opportunism, while reserving sufficient Insider discretion for effective firm management. We make the case for strengthening protections for shareholders and provide an overview of potential legislative reform paths.