My thesis is focused on an employee satisfaction research in the company with respect of divisions. The motivation system will be designed on a base of employee satisfaction research. Theory of employee motivation and fundamentals about personnel management is explained in theoretical part. Next, I introduce company and nowadays systém of motivation and evaluation of employees in practical part. Proposals possible solutions to existing problems will be also involved in practical part.

The thesis is focused on performance evaluation of the construction company. The theoretical part describes data that enter to the calculation, various indicators and methods of financial analysis. The practical part represents the case study in which is the performance evaluation of the company KALÁB - stavební firma, spol. s r.o. done by using financial analysis methods. Financial analysis is based on the balance sheet, profit and loss, and cash flow in years 2011-2015. The aim of this diploma thesis is to evaluate the development of the company in these five years.

This diploma thesis deals with the topic of incentive system to streamline the work of employees in the manufacturing plant and it is divided into two main parts. The theoretical background part and the practical part. The goal of the thesis is to first analyze existing incentive system to streamline the work of employees in the manufacturing plant and then propose its improvements in line with the achieving higher efficiency of employees work. In the theoretical background chapter, author aims at explanation of basics concepts connected with this problematic. The practical part deals with the existing incentive system and after finding the results author will recommend maybe any modification of existing system or just completely new one.

Cette thèse fait partie du projet beyond the sea® qui a pour but de développer la traction par cerf-volant à boudins gonflés (kite) comme système de propulsion auxiliaire des navires. Comme le kite est une structure souple, il est nécessaire de mettre en place une boucle d’interaction fluide-structure pour calculer la géométrie du kite en vol et ses performances aérodynamiques. Un modèle de Ligne Portante 3D Non-Linéaire a été développé pour pouvoir gérer ces ailes non planes, avec des angles de dièdre et de flèche qui varient le long de l’envergure, et également pour pouvoir prendre en compte la non-linéarité du coefficient de portance de la section aérodynamique. Le modèle a été vérifié par des simulations RANSE sur différentes géométries et donne des résultats satisfaisants pour des angles d’incidence et de dérapage variant jusqu’à 15°, avec des différences relatives de quelques pour cent pour l’estimation de la portance globale de l’aile. Les résultats locaux sont aussi correctement estimés, le modèle est capable d’estimer la position du minimum et du maximum de chargement local, selon l’envergure de l’aile, et cela même pour une aile en dérapage. En parallèle, un modèle structure a été développé. L’idée principale du modèle Kite as a Beam est de réduire le kite à un ensemble d’éléments poutre, chacun équivalent à une partie du kite composé d’une section du boudin d’attaque, de deux lattes gonflées et de la canopée correspondante. Le modèle Kite as a Beam a été comparé à un modèle éléments finis complet du kite sur des cas de déplacements élémentaires. Les résultats montrent certaines différences de comportement entre les deux modèles, avec notamment une surestimation de la raideur en torsion pour le modèle Kite as a Beam. Finalement, le modèle Kite as a Beam a été couplé avec la Ligne Portante 3D Non-Linéaire, puis comparé au modèle éléments finis, couplé également avec la Ligne Portante. La réduction du temps de calcul est réellement importante mais les résultats de la comparaison montrent la nécessité de calibrer le modèle Kite as a Beam pour pouvoir retrouver correctement les résultats du modèle éléments finis. / The present thesis is part of the beyond the sea® project which aims to develop tethered kite systems as auxiliary devices for ship propulsion. As a kite is a flexible structure, fluid-structure interaction has to be taken into account to calculate the flying shape and aerodynamic performances of the wing. A 3D Non-Linear Lifting Line model has been developed to deal with non-straight kite wings, with dihedral and sweep angles variable along the span and take into account the non-linearity of the section lift coefficient. The model has been checked with 3D RANSE simulations over various geometries and produces satisfactory results for range of incidence and sideslip up to 15°, with typical relative differences of few percent for the overall lift. The local results are also correctly estimated, the model is able to predict the position of the minimum and maximum loading along the span, even for a wing in sideslip. Simultaneously, a structure model has been developed. The core idea of the Kite as a Beam model is to approximate a Leading Edge Inflatable kite by an assembly of beam elements, equivalent each to a part of the kite composed of a portion of the inflatable leading edge, two inflatable battens and the corresponding canopy. The Kite as a Beam model has been compared to a complete kite Finite Element model over elementary comparison cases. The results show the behaviour differences of the two models, for example the torsion stiffness is globally overestimated by the Kite as a Beam model. Eventually, the Kite as a Beam model coupled with the 3D Non-Linear Lifting Line model is compared to the complete finite element model coupled with the 3D Non-Linear Lifting Line model. The gain in computation time is really significant but the results show the necessity of model calibration if the Kite as a Beam model should be used to predict the results of the complete finite element model.

Oscillating-foil hydrokinetic turbines have gained interest over the years to extract energy from renewable sources. The influence of the sweep angle on the performance of a fully-passive oscillating-plate hydrokinetic turbine prototype was investigated experimentally in the present work. The sweep angle was introduced to promote spanwise flow along the plate in order to manipulate the leading edge vortex (LEV) and hydrodynamically optimize the performance of the turbine. In the present work, flat plates of two configurations were considered: a plate with a 6° sweep angle and an unswept plate (control), which were undergoing fully-passive pitch and heave motions in uniform inflow at the Reynolds numbers ranging from 15 000 to 30 000. The resulting kinematic parameters and the energy extraction performance were evaluated for both plates. Planar (2D) particle image velocimetry (PIV) was used to obtain patterns of the phase-averaged out-of-plane vorticity during the oscillation cycle. The circulation in the wake was then related to the induced-forces on the plate by calculating the moments of vorticity of the LEV with respect to the pitching axis of the plate. Tomographic (3D) PIV was implemented in evaluating the influence of the spanwise flow on the dynamics of the vortex structure in three-dimensional space. The rate of deformation of the vortex length was quantified by calculating the deformation terms embedded in the vorticity equations, then linked to the stability of the vortex. The results show evidence of delay of the shedding of LEV and increased vortex stability, in the case of the swept plate. The manipulation of the LEV by the spanwise flow was related to the induced kinematics exhibited by the prolonged heave forces experienced by the swept plate, which led to the higher power extraction performance at high inflow velocities. In the presence of spanwise flow, positive vortex stretching along the vortex line increased the stabilization of the vortex core and prevented the onset of helical vortex breakdown, observed in the case of the unswept plate. The use of the sweep profile on the plate has led to the improvement of energy extraction performance of the fully-passive hydrokinetic turbine. / Graduate

Barn som utsätts för brott finner svårigheter med att berätta om vad deblivit utsatta för. På grund av detta är det av vikt att förhörsledaretillämpar förhörsmetoder som enligt tidigare forskning leder till att barnvågar berätta om vad de blivit utsatta för. Syftet med denna studie varatt undersöka vilka förhörsmetoder som används vid förhör med utsattabarn samt vilka metoder som genererar mest svar i form av svarsord.Studien har utgjorts av mixed methods där förundersökningsprotokolloch intervjuer med barnförhörsledare har analyserats. Analysen fann attöppna frågor och expanderande parafrasering genererar mest svarsord,medan öppna frågor och ledande frågor var de metoderna somtillämpades oftast. Förhörsledarna uttrycker i intervjuer att ledandefrågor är förödande och att de inte används i barnförhör, medan deeftersträvar att använda öppna frågor då dessa genererar längst svar frånbarnen. Resultaten diskuteras och likheter och skillnader tas upp. / Abused children have difficulties disclosing the crimes they have beenexposed to. With this in regards, it is important that interrogators useinterrogation methods that, according to previous research, leads tochildren telling about the abuse. The aim of this study was to explorewhich interrogation methods are used in interrogations with abusedchildren and which methods generate the most answers in the form ofamount of words. The study consisted of mixed methods wherepreliminary investigation reports and interviews with childinterrogation leaders were analyzed. The analysis found that openendedquestions and expanding paraphrasing generated the mostanswers in amount of words, while open-ended questions and leadingquestions were the methods that were most commonly used. Theinterrogators expressed in interviews that leading questions wereconsidered to be devastating and that they were not used ininterrogations with children, meanwhile they strived to use open-endedquestions since these types of questions generate the most answers fromthe children. The findings are discussed and similarities and differencesare addressed.

Earlier research has identified challenges in leading global virtual teams (GVTs). However, when the Covid-19 pandemic hit the world globally, even GVTs had to shift to work from home instead of an office. Hence, the purpose of this thesis is to investigate how challenges of leading GVTs have been affected by the Covid-19 pandemic. Identified challenges, including before the pandemic and additional ones that were recognized during it, are introduced. The thesis implements semi-structured interviews with leaders of GVTs to get results in line with the purpose. The results indicate that existing challenges have changed depending on what industry the GVT works in and what restrictions members face due to the pandemic. Additionally, the new challenges that were experienced during the pandemic are distractions, work/life balance, and dealing with isolation. Further challenges are having the right equipment to work comfortably, recruiting and onboarding new staff / Tidigare undersökningar har identifierat utmaningar med att leda globala virtuella team (GVT). När Covid-19 pandemin drabbade världen över påverkade det till och med GVT, som därefter behövde arbeta hemifrån istället för på ett kontor. Denna uppsats syftar därmed till att undersöka hur utmaningar med att leda GVTs har påverkats av Covid-19 pandemin. Utmaningar med att leda GVTs har identifierats i tidigare studier och inkluderar både innan pandemin och nya som har uppstått under den. För att undersöka detta genomförs semi- strukturerade intervjuer med ledare av GVTs. Resultaten indikerar att befintliga utmaningar har förändrats beroende på vilken bransch teamet arbetar i och vilka restriktioner medlemmarna står inför på grund av pandemin. Dessutom är de nya utmaningarna som uppkommit under pandemin distraktioner, balansen mellan arbete och fritid, och att hantera isolering. Ytterligare utmaningar är att de anställda har rätt utrustning för att arbeta bekvämt, rekrytering och att introducera nyanställda.

This study focuses on the development, implementation and evaluation of a research-based legally defensible forensic interview protocol for social workers in South Africa in order to improve the social worker's knowledge, understanding and skills regarding forensic assessment interviews in the field of child sexual abuse. The motivation for the study has its origin in the fact that current legislation in South Africa requires that all cases of alleged sexual abuse have to be reported to either social workers or the South African Police Service. Social workers often find themselves having to deal with allegations of sexual abuse, and are faced with the challenging task of conducting assessment interviews, where the result of such interview will be a determining factor in the final outcome of the legal proceedings. The research problem is that there is currently no national research-based forensic interview protocol for social workers in South Africa. A quantitative research approach was followed. Applied research was used to address immediate problems that are encountered by professionals in practice. Intervention research was used as research methodology. The quasi-experimental design was applied where a comparison of two groups were done. The hypothesis formulated for this study is: If this interview protocol will be applied in cases of alleged sexual abuse against children of the middle childhood, it would facilitate the disclosure in a more legally acceptable and defensible manner. An interview protocol with seven definite phases was developed. A self-developed checklist consisting of 119 fundamentals compiled from comprehensive literature study, consultations with experts and extensive experience of the researcher, was used as a measuring instrument. The researcher applied the newly developed interview protocol with ten girls (experimental group) in the middle childhood who have allegedly been sexually abused. The interviews were audio-recorded and evaluated by means of the self-developed checklist. An independent social worker also interviewed ten allegedly sexually abused children (comparison group) of the same age and gender as the experimental group. This social worker, however, made use of her own interview protocol. She represents the social workers in South Africa. The interviews were also audio-recorded and evaluated by means of the self-developed checklist. An independent professional person coded a sample of 50% of all interviews. All data were submitted to the Department Statistics of University of Pretoria who has done the statistical analysis. In chapter two the phenomenon of child sexual abuse is discussed and aspects that interviewers need to take in consideration were highlighted. In chapter three all aspects of child development are discussed. Developmental issues which need to be accommodated during forensic interviews are explored. Chapter four focuses on interview techniques in the forensic context, and international guidelines on forensic interviews were explored. This information was used to develop the proposed forensic interview protocol. In chapter five the proposed seven-phase forensic interview protocol was discussed. In chapter six all the data that was collected was quantified, analysed and interpreted with the assistance of the Department of Statistics of the University of Pretoria. The statistical analysis showed that in five of the seven phases a statistically significant difference was found between the experimental and comparison groups. The results suggest that the seven-phase forensic interview protocol was successfully implemented, and could be considered a new development and thus a contribution to the social work profession. However further research with a larger sample of children is needed. Conclusions and recommendations (chapter 7) of this study are put forward in accordance with the process that was followed in developing and implementing the interview protocol which would assist social workers when dealing with alleged victims of child sexual abuse. / Thesis (DPhil)--University of Pretoria, 2007. / Social Work and Criminology / unrestricted

Cette thèse concerne l’aérodynamique de pales d'extrémité transsonique. Ces pales sont conçues pour maximiser le rendement en croisière, tout en générant la traction requise au décollage. Elles ont des profils fins et peu cambrés, travaillant à forte incidence au décollage, ce qui peut entraîner l’apparition d’un tourbillon de bord d’attaque (TBA). Or ce TBA présente des similitudes avec les tourbillons d’apex d’aile Delta, connus pour leur capacité à générer de la portance tourbillonnaire.Cette étude consiste à examiner l’intérêt du TBA pour les performances aérodynamiques.La démarche a consisté dans un premier temps à caractériser la topologie du TBA sur une maquette représentative d’une pale d’ Open Rotor, à l'aide d'essais PIV résolus en temps et de calculs RANS k-omega SST, et à évaluer la capacité de la simulation RANS à reproduire les caractéristiques d’intérêt pour cette étude. Un algorithme a été développé afin d'estimer la contribution de ce TBA à la portance à partir du champ de pression pariétal RANS.Afin d'expliciter l'influence des paramètres géométriques et de fonctionnement de la pale sur la portance tourbillonnaire, un modèle 1D de la portance tourbillonnaire a été développé puis couplé à la méthode de l'élément de pale.Les premières comparaison de géométries à iso-traction ont montré que la portance tourbillonnaire permet de générer la traction requise au décollage avec une surface alaire plus faible. Ces résultats ouvrent de nouvelles perspectives pour la conception de géométries avec un meilleur rendement en croisière. / This thesis deals with the aerodynamic properties of propeller blades. Those blades are designed to maximise cruise efficiency, while achieving the target thrust at take-off. Their thin, low-cambered profiles must work at high incidence at take-off, which may give rise to a leading-edge vortex (LEV).The topology of this LEV looks similar to Delta wing LEVs, which are known to generate vortex lift.the aim of this study is to explore the probable impact of the LEV on lift at take-off in order to reconsider propeller blade designs. The approach first consisted in caracterising the LEV topology on a model blade representative of an Open Rotor front blade, using both Time-Resolved PIV and RANS k-omega SST calculations. The comparison between both methods demonstrated the ability of RANS calculations to reproduce the LEV characteristics of interest to this study.Then, the LEV contribution to lift was evaluated thanks to an algorithm developed to estimate vortex lift contribution from RANS wall pressure fields.In order to explicit the influence of the blade's geometrical and functioning parameters on vortex lift, a 1D vortex lift model was developed and coupled to the Blade Element Momentum Theory.The first blade geometry comparative studies at iso-thrust showed that vortex lift enables to generate target thrust at take-off with a lower blade surface. This opens new perspectives for the design of blade geometries with enhanced cruise efficiency.

Small-scale wind turbines were not considered viable in the past due to their poor efficiencies, mainly because of their aerodynamic effects around the irfoil shape. Recently researchers have renewed interest in enhancing the aerodynamic performances of the blades’ designs inspired by the aerodynamic pattern of biological characteristics of insects and marine mammals such as locusts, dragonflies, damselflies, Humpback Whales etc. Bioinspired wing designs have advantages compared to conventional smooth irfoil blades as they can counter the bending forces that the wings experience during flapping. Bio-inspired corrugated airfoil based on dragonfly wing geometries have been reported to perform well compared to conventional airfoil at low Reynolds numbers. Corrugated airfoils reduce flow separation and enhance aerodynamic performance by trapping vortices in the corrugations thus drawing flow towards the airfoil’s surface. This results in the higher lift whilst incurring only marginally higher drag. Such airfoils also have an advantage when it comes to span-wise structural stiffness due to the corrugated cross-sections. Replacing conventional turbine blades by tubercles or corrugated blades could enhance turbine performance by reducing the pressure gradient along the leading edge; however, the aerodynamic effects at the leading edge will depend on the variations of wavelength and amplitude. In this study, two types of computational studies were investigated: Optimising a corrugated airfoil and investigating the aerodynamic effects of a sinusoidal shape at the leading edge of a blade. Previous studies used an idealized geometry based on the dragonfly wing cross-section profile but did not attempt to optimize the geometry. In the present study: a two-dimensional CFD model is constructed using ANSYS Fluent Workbench-Design Explorer to determine the optimal corrugated blade profile for four angles of attack (AOA) from 5° to 20° corresponding to typical AOA of small-scale wind turbine blades. Two modified blades with variations of wavelength and amplitude at the leading edge were studied to investigate the aerodynamic effects. Three-dimensional models were constructed using Qblade software and 3D points were exported to AutoCAD Inventor to generate the CAD model. The governing equations used are continuity and Navier-Stokes equations written in a frame reference rotating with the blade. The CFD package used is ANSYS FLUENT 19.0. The simulation was run under steady-state, using SST-k omega turbulence model. The modifications have improved the aerodynamic performance. The optimised corrugated blade produced a maximum increase of CL and L/D. Both modified blades (1 and 2) had their performances measured separately and compared to that of baseline blade SG6042 (Conventional blade). Modified blade 1 had a lower wavelength and amplitude at the leading edge of 14.3 % and 4 % respectively of the chord. It was noted that the aerodynamic performance decreased by 6%. Modified model 2, on the other hand had a higher wavelength and amplitude at the leading edge. of 40.4 % and 11.9 % respectively of the chord. It was also noted the aerodynamic performance increased by 6%. From the empirical evidence highlighted above, it can be observed that there is a direct correlation between wavelength, amplitude, and aerodynamic performance of the blade. / Electrical and Mining Engineering / M. Tech. (Engineering)