The prediction of sound generated from fluid flow has always been a difficult subject due to the nonlinearities in the governing equations. However, flow noise can now be simulated with the help of modern computation techniques and super computers. The research presented in this thesis uses the computational fluid dynamics (CFD) and the acoustic finite element method (FEM) in order to simulate the whistle noise caused by vortex shedding. The acoustic results were compared to both analytical solutions and experimental results to better understand the effects of turbulence models, fluid compressibility, and wall boundary meshes on the acoustic frequency response. In the case of the whistle, sound power and pressure levels are scaled since 2-D models are used to model 3-D phenomenon. The methodology for scaling the results is detailed.

Soft trim absorbing parts (i.e., headliners, backwalls, side panels, etc.) are normally comprised of different layers including films, adhesives, foams and fibers. Several approaches to determine the complex wavenumber and characteristic impedance for porous sound absorbing materials are surveyed and the advantages and disadvantages of each approach are discussed. It is concluded that the recently documented three-point method produces the smoothest results. It is also shown that measurement of the flow resistance and the use of empirical equations is sufficient for many common materials. Following this, the transfer impedance of covers, adhesives, and densified layers are measured using an impedance difference approach. The transfer matrix method was then used to predict the sound absorption of a multi-layered materal which included a perforated cover, fiber layers, and an adhesive. The predicted results agree well with measurement.

Följs kravspecifikationerna? I följande uppsats analyseras och granskas om producenter följer kraven i kravspecifikationen, som modeföretaget skickar med orderbeställningen. Med syfte att, genom en kvalitativ samt experimentell undersökning, komma fram till om kraven som gäller tunna trikåtröjor av mörk kulör, i modeföretagets kravspecifikation, uppfylls vid produktion. Genom kvalitativa intervjuer med kunniga inom områdena, kvalitettester, trikåmaterial, produktion utomlands och kravspecifikationer, kunde författarna få svar på om det sker att producenter bortser från krav i kravspecifikationen och varför dem troligtvis gör det. Genom en experimentell undersökning har författarna utgått från standarder i kravspecifikationen samt testat och analyserat två tröjor från 2014 års säsong med två tröjor från 2015 års säsong, för att bedöma om de skiljde sig åt, då de skall vara producerade utifrån samma kravspecifikation. I resultatet presenteras den experimentella undersökningen; hur författarna gick tillväga för att få fram det mest sanningsenliga resultatet samt citat från de kvalitativa intervjuerna. Citaten styrker författarnas spekulationer och teorier om att somliga producenter bortser från krav i kravspecifikationen. Vidare i diskussion- och analyskapitlet analyseras och diskuteras resultat med teorier och citat. De slutsatser som författarna kan dra utifrån de kvalitativa intervjuerna och den experimentella undersökningen är, att det är vanligt förekommande, att producenter medvetet väljer att bortse från vissa krav i kravspecifikationen. Dock görs det inte endast för att tjäna pengar, utan det handlar likaså om att hålla deadlines och att hålla sin kund nöjd, för att på så vis behålla relationen. Det kan också handla om olika kulturskillnader och språksvårigheter i kommunikationen där kravspecifikationerna inte är tillräckligt tydligt förklarande, vilket resulterar i att producenten får vidta åtgärder och uppskatta själv vad kunden efterfrågar. / Do the producers follow the specifications? This study analyses and reviews if producers follow the requirements of the fashion company’s specification. The purpose was to, through a qualitative and experimental research, decide if all the requirements that involve dark coloured thin knitted t-shirts, of the company's specifications are applied during the production. Through interviews with people with great knowledge within the subjects; quality controls, knitted materials, production abroad and specifications, the authors’ got answers to whether producers ignore the requirements in the specification, as well as why. Through an experimental study, following the standards in the specifications, two shirts from season 2014 and two shirts from season 2015 were examined and compared, to see if they differed. All shirts were supposed to be produced by the same specifications. In the result, the experimental study presents; how the authors proceeded to truthful results. Quotes from the qualitative interviews are also presented. The quotations prove the authors' speculations and theories, regarding the issue of some manufacturers ignoring requirements in the specifications. Furthermore, in the discussion- and analysis chapter, results are analysed together with theories and quotes. The conclusions that can be drawn from the qualitative interviews and the experimental study, is that it is a common problem. Producers deliberately choose to overlook certain requirements in the specifications. However, it is not only in order to make more money, but it is also about managing deadlines and keeping customers satisfied, in order to maintain relationships. The problem is also based on cultural differences and language difficulties in communication, where the specifications are not sufficiently clear enough, resulting in the producer must take action and appreciate what the customer wants.

There have been significant advances in the information systems (IS) literature about the business value that can be realized through information technology (IT) investments and the mechanisms through which IT creates different facets of business value. We identify three important gaps in understanding the literature on IT business value. First, it is unclear how risk arising from deficiencies in a firm’s information environment, along with internal and external contextual factors, affects a firm’s IT implementation choices. Second, it is unclear how IT resources in a focal domain need to be combined with knowledge resources in the same domain and IT resources in other domains to develop process capabilities and create process-level benefits. Third, it is unclear what risks IT-enabled process innovations create for different process stakeholders and what controls can be applied to mitigate these risks. My dissertation addresses the above three gaps in three essays. The first essay examines the influence of a firm’s information risk on its prioritization of accounting enterprise systems (AES) relative to complementary enterprise systems and the moderation of this relationship by the weaknesses of internal controls and environmental uncertainty characteristics. The second essay focuses on the impact of AES implementation on a firm’s internal controls process, and the complementary roles of managerial competence and enterprise systems implemented in other domains related to the internal controls process of the firm. The final essay explores the risk factors that can arise for buyers and suppliers due to the use of reverse auctions, and the controls that can be applied to mitigate the key risk factors. In terms of research methods, the first two essays apply econometric analysis to panel datasets constructed from multiple sources and the third essay uses a combination of Delphi studies and semi-structured interviews. Collectively, the essays advance our understanding of (1) the factors underlying a firm’s prioritization of IT investment choices; (2) the mechanisms through which IT resources, in combination with human expertise, create business value; and (3) the risks introduced for different stakeholders by the adoption of IT-enabled process innovations and the controls that can be used to effectively mitigate them.

Inledning: Svensk e-handel är under kraftig tillväxt. Att försäljningen har ökat kraftigt beror bland annat på att privatpersoner under de senaste 10 åren blivit bekvämare med att handla på Internet. I takt med att följningen ökat, har även konkurrensen ökat. För att företag ska kunna överleva och växa sägs MCS därför vara av stor betydelse. E-handeln innebär en relativt ny situation för företagen och innebär stor osäkerhet i form av snabba beslut, hög konkurrens och pressade priser. Formella styrmedel gör att företagen snabbt kan anpassa sig efter specifika situationer och uppnå ett bättre resultat. Syfte: Syftet med studien är att kartlägga förekomsten av formella styrmedel i e-handelsföretag för att se om de används och vilken betydelse de har. Vidare är syftet att identifiera kritiska situationsfaktorer inom e-handeln och utifrån dessa analysera hur de påverkar e-handelns formella ekonomistyrning. Genom att göra detta vill vi utveckla kunskap kring relationen mellan ekonomistyrning och situationsfaktorer inom e-handeln. Metod: Utifrån fyra faktorer; tillväxt, storlek, resultat och bransch, har vi valt ut tio stycken e-handelsföretag att göra en komparativ intervjustudie på. Med varje företag har en halvstrukturerad intervju genomförts. Slutsats: Några av de situationsfaktorer som påverkar den formella ekonomistyrningen är tillväxt, hög konkurrens, snabba beslut, strategi och storlek. Vidare påverkar även de olika faktorerna till stor del varandra. Formella styrmedel som används är planering och budgetering på kort sikt, både finansiella- och icke-finansiella mått och kalkyler till viss del. Strukturen och kultur påverkar även hur dessa används och vilken betydelse de har. / Introduction: Swedish e-commerce is in rapid growth. Sales have increased substantially due to individuals in the last ten years has become more comfortable to online-shopping. As the growth increases, the competition also becomes fiercer. For companies to survive and grow MCS is of great importance. E-commerce is a relatively new situation for companies and involves uncertainty in the form of quick decisions, high competition and price pressure. Formal controls enables companies to quickly adapt to specific situations and achieve better results. Purpose: The purpose of this study is to identify the existence of formal controls in e-commerce companies, to see if they are used and what impact they have. Furthermore, the purpose is to identify critical situation factors in e-commerce and from these analyse which impact they have on e-commerce formal controls. By doing this, we want to develop knowledge about the relationship between management control and situational factors in e-commerce. Methodology: Based on four factors; growth, size, performance and industry, we have selected ten e-commerce companies to make a comparative interview study on. With every company a semi-structured interview was conducted. Conclusion: Some of the situational factors that affect the formal controls are; growth, intense competition, rapid decisions, strategy and size. The situational factors also affect each other. Formal controls are used for planning and budgeting in the short term, both financial and non-financial measurements and also cost accounting to some extent. The structure and culture affects how they are used and what impact they have.

In May 2004 there was a shake-up in the private pharmaceutical industry in South Africa. The National Department of Health (DOH) introduced a form of price control which for the first time attempted to regulate prices at every level of the pharmaceutical distribution chain. The price controls was immediately challenged and was not properly implemented until partially upheld by the Constitutional Court at the end of 2005. Throughout 2006 the DOH (through the Pricing Committee) reconsidered parts of the price controls, dealing with an appropriate dispensing fee for retailers, which were struck down by the Constitutional Court. In late 2006, a new dispensing fee was published and then immediately challenged. The DOH claims they had to do this to make sure that medicines remain affordable, and pharmacists at the end of the day get a reasonable income from each price band. The United South African Pharmacies (USAP) and the Pharmacy Stakeholders1 Forum (PSF) claim that implementation of the price controls would have pharmacies not being able to cover their expenses. The objectives of the study are to ascertain whether the price controls forced upon the healthcare industry by the DOH of South Africa is viable in small retail pharmacies and what the impact will be on small retail pharmacies and their communities. The actual annual income statements for 2006 of three typical pharmacies were obtained. The next step was to determine the effect that the price controls would have had on the total sales and key financial factors in the income statement if the price controls was already in force in 2006. A revised experimental income statement was then created for the pharmacies. The experimental statements were then compared to the actual statements to determine the effects of the price controls. The comparison showed that all the pharmacies were following the same trend and had a decrease in net profit. Two of the pharmacies would have had a net loss for the year while the third will continue to show a net profit although much lower. This net profit decreased from 7% to 3% following a decrease in gross profit (GP) from 33% to 30%. The GP of the front sales shop remained unchanged, while the GP percentage for the dispensary decreased by 5% from 30% to 25%. The DuPont model showed that the Return on Equity (ROE) decreased from 83% to 33%. Drug price regulations could force many pharmacies into bankruptcy and ensure that the distribution of drugs to rural and remote areas will be financially impracticable. Once in place, the drug price regulations are likely to become ever more complex and onerous to comply with. The price regulations may end up reducing price competition among manufacturers, and in the long run, will harm the consumer by fixing prices above what would otherwise have been achieved in an open competitive market. The drug price regulations distort the normal market clearing process and effectively increase demand for medicine without providing the economic incentives that serve to match demand with supply. / Thesis (M.B.A.)--North-West University, Potchefstroom Campus, 2008.

In May 2004 there was a shake-up in the private pharmaceutical industry in South Africa. The National Department of Health (DOH) introduced a form of price control which for the first time attempted to regulate prices at every level of the pharmaceutical distribution chain. The price controls was immediately challenged and was not properly implemented until partially upheld by the Constitutional Court at the end of 2005. Throughout 2006 the DOH (through the Pricing Committee) reconsidered parts of the price controls, dealing with an appropriate dispensing fee for retailers, which were struck down by the Constitutional Court. In late 2006, a new dispensing fee was published and then immediately challenged. The DOH claims they had to do this to make sure that medicines remain affordable, and pharmacists at the end of the day get a reasonable income from each price band. The United South African Pharmacies (USAP) and the Pharmacy Stakeholders1 Forum (PSF) claim that implementation of the price controls would have pharmacies not being able to cover their expenses. The objectives of the study are to ascertain whether the price controls forced upon the healthcare industry by the DOH of South Africa is viable in small retail pharmacies and what the impact will be on small retail pharmacies and their communities. The actual annual income statements for 2006 of three typical pharmacies were obtained. The next step was to determine the effect that the price controls would have had on the total sales and key financial factors in the income statement if the price controls was already in force in 2006. A revised experimental income statement was then created for the pharmacies. The experimental statements were then compared to the actual statements to determine the effects of the price controls. The comparison showed that all the pharmacies were following the same trend and had a decrease in net profit. Two of the pharmacies would have had a net loss for the year while the third will continue to show a net profit although much lower. This net profit decreased from 7% to 3% following a decrease in gross profit (GP) from 33% to 30%. The GP of the front sales shop remained unchanged, while the GP percentage for the dispensary decreased by 5% from 30% to 25%. The DuPont model showed that the Return on Equity (ROE) decreased from 83% to 33%. Drug price regulations could force many pharmacies into bankruptcy and ensure that the distribution of drugs to rural and remote areas will be financially impracticable. Once in place, the drug price regulations are likely to become ever more complex and onerous to comply with. The price regulations may end up reducing price competition among manufacturers, and in the long run, will harm the consumer by fixing prices above what would otherwise have been achieved in an open competitive market. The drug price regulations distort the normal market clearing process and effectively increase demand for medicine without providing the economic incentives that serve to match demand with supply. / Thesis (M.B.A.)--North-West University, Potchefstroom Campus, 2008.

Commissioning of HVAC systems has potential for significant improvements in occupant satisfaction, comfort and energy consumption, but is very labour-intensive and expensive as practiced at this time. Previous investigators have capitalized on digital control systems' capability of logging and storing data and of interfacing with external computers for open loop control by developing methods of automated fault detection and diagnosis during normal operation. Some investigators have also considered the application of this technique in commissioning. This thesis investigates the possibility of utilizing first principles and empirical models of air-handling unit components to represent correct operation of the unit during commissioning. The models have parameters whose values can be determined from engineering design intent information contained in the construction drawings and other data available at commissioning time. Quasi-dynamic models are developed and tested. The models are tested against design intent information and also against data from a real system operating without known faults. The results show the models agree well with the measured data except for some false positive indications, particularly in the damper and fan models, during transients. A procedure for estimating uncertainty in the instrumentation and the models is developed. The models are also tested against artificial faults and are able to detect all of the faults. Methods of diagnosing the faults are discussed.

In order to provide a novel perspective for videography of high speed sporting events, a highly capable trajectory tracking control methodology is developed for a custom designed Kadet Senior Unmanned Aerial Vehicle (UAV). The accompanying high fidelity system identification ensures that accurate flight models are used to design the control laws. A parallel vision based target tracking technique is also demonstrated and implemented on a Graphical Processing Unit (GPU), to assist in real-time tracking of the target. Nonlinear control techniques like feedback linearization require a detailed and accurate system model. This thesis discusses techniques used for estimating these models using data collected during planned test flights. A class of methods known as the Output Error Methods are discussed with extensions for dealing with wind turbulence. Implementation of these methods, including data acquisition details, on the Kadet Senior are also discussed. Results for this UAV are provided. For comparison, additional results using data from a BAC-221 simulation are also provided as well as typical results from the work done at the Dryden Flight Research Center. The proposed controller combines feedback linearization with linear tracking control using the internal model approach, and relies on a trajectory generating exosystem. Three different aircraft models are presented each with increasing levels of complexity, in an effort to identify the simplest controller that yields acceptable performance. The dynamic inversion and linear tracking control laws are derived for each model, and simulation results are presented for tracking of elliptical and periodic trajectories on the Kadet Senior.

Drivers are expected to traverse through an intersection in malfunctioning flash mode in the same manner as a stop-sign controlled intersection. Red/red flash corresponds to four-way stop control and yellow/red flash corresponds to two-way stop control. However, at a red flashing signal there is no assurance that a driver can see the cross street indication (i.e., yellow or red flash) and therefore does not know if the intersection is operating as a two-way or four-way flash. In addition, some drivers appear unclear on the rules at a flashing signal. This confusion makes the intersection more accident prone. This study builds upon several previous studies, using data extracted from existing files. The objective of this study is to determine the level of drivers' understanding of the flash control through an analysis of violation rates and types at recorded intersection in malfunction flash. Comparing these violation rates to those at comparable stop-control intersections will help illustrate the difference in drivers' understanding of these similar intersection control devices.