Our purpose with this qualitative study is to investigate how teachers experience their work situation, using Karasek and Theorell?s demand-, control- and support model. The study is based upon ten semi-structured interviews with gymnasium teachers. The interviews were transcribed and coded with three different themes; demand, control and support. We analyzed the results with Karasek and Theorell?s mentioned model.

Many organizational changes have been accomplished in elder care since the 1980's and many of those have been influenced by market mechanisms. The purpose of this study is to examine how the implementation of these market mechanisms has affected three important aspects in the work situation for personnel. These aspects are, demand, control and support. To attain the purpose of this study, five qualitative interviews with home care personnel have been carried out. The interview material has been analyzed and structured with the help of Karasek and Theorells Demand-control-support model.

AbstractThe purpose with this study was to get knowledge if there are any possible differences in, and correlation between, experienced stress, experienced demands, experienced control and experienced social support in correlation to shiftwork.The study was made at two central hospitals in south of Sweden and had 90 participants (78 women and 12 men) that answered a questionnaire in the current variables. The result in experienced stress showed that there were no differences between shift workers. The results showed a difference between the day- and the nightshift in the correlation between control and stress. The writers speculates that the reason why the nightshift experience high stressvalues with high control can depend on the lack of presence by higher managers, compared with the dayshift. .

This study deals with one of the most discussed work environmental issues in the modern society of Sweden today - work related stress, its causes and how stress can affect people in their working situation. Our study is based on a questionnaire among aid handling officers in two municipalities of the middle of Sweden, and two interviews with their directors. We found that aid handling officers has a complex occupational role. We also found that the officers in these two municipalities experiences about the same level of stress.Further in the study, we will deal with whatever could be the cause of the stressful situation, using the demand/control model of Karasek and Theorell. The result shows that despite the similarity of the stress experience, the cause was shown to be different.

The aim of this study was to explore how six men who run a micro-enterprisewith a maximum of 10 employees handle the balance between work and otherlife. Qualitative approach with semi-structured interviews was conducted and thesample consisted of six men with micro-enterprises of varying ages. The themesused in the interviews were boundless work, roles, boundaries strategies anddemand / control - social support. The results showed that micro- entrepreneursdo not experience any major imbalance between work and other life. The studyrevealed that the division of roles in the home of the elderly respondents was ofthe classical gender character that woman took great responsibility in the home.Among the younger respondents the unpaid work at home was equal divided.Social support was perceived highly by all respondents, and they alsoexperienced a high level of control over the requirements of the job.

The control of indoor temperature must be able to handle large time constants and both measureable disturbances like outdoor temperature, and non-measurable disturbances, like waste heat from appliances. Due to cheaper microcontrollers (small computers with designated tasks) with better performance, more advanced and computation-demanding methods for control can be used.In this thesis, Generalized Predictive Control (GPC) has been implemented and tested on a theoretically derived model of a house. GPC states that a model of the system is estimated in every sample, and the control is carried out simultaneously, based on predictions of the model. Disturbances like solar radiation can be estimated and used in the control as well. The control signals are determined by quadratic programming, which makes it possible to consider conditions, for example limitations on the control signals.GPC requires a number of parameters to be defined, like model order and control signal penalty, but is relatively robust for variations in them.

This thesis has been conducted at Saab Bofors Dynamics AB. The purpose was to investigate if a non-linear missile model could be stabilized when the optimal control signal is computed considering constraints on the control input. This is particularly interesting because the missile is controlled with rudders that have physical bounds. This strategy is called Model Predictive Control. Simulations are conducted to compare this strategy with others; firstly simulations with step responses and secondly simulations when the missile is supposed to hit a moving target.

The purpose of this thesis was to look at the relationship between the experiences of work related stress among male bank employees and how they dealt with potential stress. The thesis focused on male bank employee?s experiences and management of work related stress with the control requirements and support model as a starting point. Work related stress is a phenomenon that has become a serious problem with economic impact for both the individual and organizations. Increased absence from work due to medical issues is one example of such consequences.

In industrial control systems PID-control remains the prevalent strategy, also for processes that would benefit from model based control. The purpose of this thesis is to evaluate whether model based control can be readily implemented in an industrial control system. To this end a simulated surge tank with a simulated industrial control system is studied. For evaluation two scenarios with specified objectives are selected.Following a review of LQR and versions of MPC, Predictive Functional Control (PFC) is considered the most suitable for implementation. PFC is a form of MPC developed with industrial applications in mind and therefore has several advantages for implementation in an industrial control system.

Introduction: First line managers in the public sector, are under a great pressure from both senior management, leadership, politicians and often from a large group of employees. Few studies have been made on the first-linemanagers psychosocial work environment, even though in the studies found that the manager affects their employees work environment.Aim: How first line managers in municipal elderly describes the psychosocial work environment on the basis of demand-control - support model.Methods: The study was conducted through individual interviews with six first line managers. Respondents were recruited through a strategic selection in a medium-sized municipality in Västernorrland. The interviews were conducted using an interview guide. Qualitative content analysis with an deductive approach was used as a method of interpretation of the results.Results: First line managers point out the difficulty in balancing the requirements and several managers also mentioned the importance of having clear role descriptions and objectives.

A cars powertrain consists of everything that is needed for its propulsion. The components in the driveline that transfer the power from the engine to the driven wheels are not absolutely stiff, hence they will wind up due to the torque and act as torsion springs. If you suddenly demand a bigger torque by stepping on the accelerator pedal, a so called tip in manoeuvre, and that torque is acquired from the engine as quickly as possible, the driveline will not be able to transfer that fast torque change due to its weakness and as a result it will start to oscillate. These oscillations will be transferred to the driven wheels and make the car to accelerate jerkily which will be experienced as uncomfortable by the passengers. Furthermore, there is a backlash in the driveline that will make the weakness in the driveline even more excited than it should have been if the backlash did not existed.To avoid too big problems with these oscillations there is a control system that controls the demanded torque.

The purpose of this report is to find a model of statistics for construction and demolition waste, which makes it useful for the local manager at the building site. The intention with the model is that it will be used as a support of the local manager, to direct his project towards reduced strain of the environment. The model will also be used to make it easier to control that the claims from authority and aims for the environment are achieved. To familiarise with the subject waste handling within the building and construction sectorI have done a literature search. I have also been studying rules and regulations regarding the waste handling.

The aim of the study has been to gain an increased understanding of the sense of participation and influence that the enrolled nurses, working with home-help services within the purchaser ? provider model, feel and how this participation and influence affect them. Five enrolled nurses in three of Stockholm's districts related their experiences of participation and influence at work in the qualitative interviews that were conducted. The result was then analyzed with the help of two theories, Karasek's and Theorell´s Demand- Control Model and Antonovsky's theory regarding ?a Sense of Coherence (SOC)?.

This master?s thesis describes the development of a model of the catalystsystem aiming at control by an MPC. A well functioning model, which is suitable in control purpose, is important while emission legislation become more and more hard to fulfill for the car manufacturers. Much research has been done in the field of physical modeling of the system, but in this work a linear adaptive time discrete ARX-model is developed and validated.The systems tendency to change its dynamic during usage implies that the model must be adaptive. The developed model proved to be well functioning and shows promising conditions for the MPC design.

The main focus with this study was to investigate if there was a difference in level ofeducation and self-rated health and if it could be explained by the amount of control,demands and social support at work. Theories used in this essay are education, health,and the job strain-model (control, demands and social support at work). We used analready done study by Folkhälsoinstitutet (2004) to examine these questions. Theanalysed sample consists of respondents 12 166 aged 18-84 years. The decline was39, 2 %.