Genrestratifiering och massmedias neutralisering av kritiken mot ADHD : Ett kunskapssociologiskt perspektiv

Genre stratification and the mass media’s neutralization of the critique of ADHD: A sociology of knowledge perspective This study examines how the Swedish mass media has dealt with the opposition against the neuropsychiatric diagnosis ADHD (Attention Deficit Hyperactivity Disorder). Drawing on empirical data from eight of the largest newspapers in Sweden (n=778 articles) the study focuses on the scientific controversy of DAMP, 2000–2006. DAMP (Dysfunction in Attention, Motor Control and Perception) is a diagnostic term denoting difficulties similar to ADHD, and which was used in Sweden at the time of the controversy. The study uncovers the ideological role played by the mass media during the DAMP-controversy, and demonstrates the significance of genre. While the spokespersons for DAMP/ADHD were given exclusive and systematic access to the news genre, the forum of fact-production in the mass media, the critics of DAMP/ADHD were confined to arguing and expressing their opinions in the debate genre. Based on the various effects of genre differences a comprehensive analytical tool for the sociology of knowledge, called genre stratification, is developed in the study 

DC Motor Speed Control via Fuzzy / Pole Placement / PI Controller

This report presents a new way of control engineering. Dc motor speed controlled by three controllers PID, pole placement and Fuzzy controller and discusses the advantages and disadvantages of each controller for different conditions under loaded and unloaded scenarios using software Matlab. The brushless series wound Dc motor is very popular in industrial application and control systems because of the high torque density, high efficiency and small size. First suitable equations are developed for DC motor. PID controller is developed and tuned in order to get faster step response. The simulation results of PID controller provide very good results and the controller is further tuned in order to decrease its overshoot error which is common in PID controllers. Further it is purposed that in industrial environment these controllers are better than others controllers as PID controllers are easy to tuned and cheap. Pole placement controller is the best example of control engineering. An addition of integrator reduced the noise disturbances in pole placement controller and this makes it a good choice for industrial applications. The fuzzy controller is introduce with a DC chopper to make the DC motor speed control smooth and almost no steady state error is observed. Another advantage is achieved in fuzzy controller that the simulations of three different controllers are compared and concluded from the results that Fuzzy controller outperforms to PID controller in terms of steady state error and smooth step response. While Pole placement controller have no comparison in terms of controls because designer can change the step response according to nature of control systems, so this controller provide wide range of control over a system. Poles location change the step response in a sense that if poles are near to origin then step response of motor is fast. Finally a GUI of these three controllers are developed which allow the user to select any controller and change its parameters according to the situation.