Device drivers are Operating Systems (OS) extensions that enable the use of I/O devices in computing systems. However, studies have identified drivers as an Achilles’ heel of system reliability, their high fault rate accounting for a significant portion of system failures. Consequently, significant effort has been directed towards improving system robustness by protecting system components (e.g., OS kernel, I/O devices, etc.) from the harmful effects of driver faults. In contrast to prior techniques which focused on preventing unsafe driver interactions (e.g., with the OS kernel), my thesis is that checking a driver’s execution for correctness violations results in the detection and mitigation of more faults. To validate this thesis, I present Guardrail, a flexible and powerful framework that enables instruction-grained dynamic analysis (e.g., data race detection) of unmodified kernel-mode driver binaries to safeguard I/O operations and devices from driver faults. Guardrail decouples the analysis tool from driver execution to improve performance, and runs it in user-space to simplify the deployment of new tools. Moreover, Guardrail leverages virtualization to be transparent to both the driver and device, and enable support for arbitrary driver/device combinations. To demonstrate Guardrail’s generality, I implemented three novel dynamic checking tools within the framework for detecting memory faults, data races and DMA faults in drivers. These tools found 25 serious bugs, including previously unknown bugs, in Linux storage and network drivers. Some of the bugs existed in several Linux (and driver) releases, suggesting their elusiveness to existing approaches. Guardrail easily detected these bugs using common driver workloads. Finally, I present an evaluation of using Guardrail to protect network and storage I/O operations from memory faults, data races and DMA faults in drivers. The results show that with hardware-assisted logging for decoupling the heavyweight analyses from driver execution, standard I/O workloads generally experienced negligible slowdown on their end-to-end performance. In conclusion, Guardrail’s high fidelity fault detection and efficient monitoring performance makes it a promising approach for improving the resilience of computing systems to the wide variety of driver faults.

The main purpose of this study is to investigate the effects of Facebook activities on relationship drivers and relational benefits and the effect of relationship drivers of relational benefits perceived by customers to Pite Havsbad. To do this we have explored the relationship between a number of Facebook activities, relationship drivers and relational benefits. We developed two conceptual models, which included these relationships. We have written this degree project on commission for Pite Havsbad, which is a company that operates in the hotel industry in the county of Norrbotten in the north of Sweden. The research question that we formulated was as following:   What kind of impact does Facebook activities have on relationship drivers and relational benefits in the hospitality industry?   With this research question we aimed to make a practical contribution and to help Pite Havsbad develop their social media strategies in order to be able to build customer relationships. We also aimed to make a theoretical contribution to fill the research gap that exists in the research area on social media and customer relationship building. We used a quantitative data collection method in the form of a survey administered on Pite Havsbad’s Facebook page. Our population consist of the approximately 6 300 fans that Pite Havsbad has on Facebook. The data continuing of was 256 responses were processed in SPSS by conducting Cronbach’s alpha test, Pearson correlation and multiple regression analysis in order to test the hypothesized effects between our key variables.   The findings from this degree project show that Facebook activities affect both the relationship drivers and relational benefits, although they have less effect on relational benefits. The relational benefits are though highly affected by the relationship drivers. Over all, the Facebook activities of Pite Havsbad were highly valued by the respondents, which means that all of them are important to work with. Many of the activities also had positive effects on the relationship drivers, which means they can be used to build relationships with customers. By conducting this research we also helped Pite Havsbad with the starting point of creating a Social CRM strategy, which can be used for future relationship building with their fans on Facebook.

Worldwide, fatal traffic injuries and drowning deaths are important problems. The aim of this thesis was to investigate the cirumstances of fatal and non-fatal traffic injuries and drowning deaths in Sweden including analysis of the presence of alcohol and drugs, which are considered to be major risk factors for these events. Data where obtained from the database of National Board of Forensic Medicine. In the first study, we investigated 420 passenger deaths from 372 crashes during 1993-1996. There were 594 drivers involved. In total, 21% of the drivers at fault were alcohol positive compared to 2% of drivers not at fault (p<0.001) (Paper I). During 2004-2007, crashes involving 56 fatally and 144 non-fatally injured drivers were investigated in a prospective study from Northern Sweden (Paper II). The drivers were alcohol positive in 38% and 21%, respectively. Psychoactive drugs were found in 7% and 13%, respectively. Benzodiazepines, opiates and antidepressants were the most frequent drugs found in drivers. Illict drugs were found 9% and 4% respectively, with tetrahydrocannabinol being the most frequent of these drugs (Paper II). We investigated 5,125 drowning deaths in Sweden during 1992-2009 (Paper III). The incidence decreased on average by about 2% each year (p<0.001). Unintentional drowning was most common (50%). Alcohol was found in 44% of unintentional, 24% of intentional, and 45% of undetermined drowning deaths. Psychoactive substances were detected in 40% and benzodiazepines were the most common substance. Illicit drugs were detected in 10%. Of all drowning deaths, a significantly higher proportion females commited suicide compared with males (55% vs. 21%, p<0.001). Suicidal drowning deaths (n=129) in Northern Sweden were studied further in detail (Paper IV). of these, 53% had been hospitalized due to a psychiatric diagnosis within five years prior to the suicide. Affective and psychotic disorders were the most common psychiatric diagnoses. Almost one third had performed a previous suicide attempt. One fourth had committed suicide after less than one week of discharge from hospital. Alochol was found in 16% and psychoactive drugs in 62% of these cases, respectively.  In conclusion, alcohol and psychoactive drugs are commonly detected among injured drivers and drowning victims, and probably play a role in these events. Most of the individuals that tested positive for alcohol and high blood concentrations, indicating alochol dependence or abuse. This association warrants futher attention when planning future prevention.

Value based management is a process that can be used to determine a business’s value drivers. It attempts to determine how the drivers link to value creation, and then break down the value drivers into achievable activities that can be pursued by employees. Due to strict medicine pricing regulations in the country, it is becoming increasingly difficult for pharmacy businesses to stay profitable. This study set out to develop a value based management framework that could be used by pharmacy management in order to maximise value creation in the business and help ensure its survival despite the strict pricing regulations. Secondary objectives were to contextualise the term “value based management”, to identify the value drivers in a pharmacy business and to determine the extent to which value based management and its principles are being applied in pharmacies in the North West region of South Africa. The research study began in the literature where the term “value based management” was introduced and a literature study was done to conceptualise the term by investigating why value based management and value creation were important. Value based management metrics, the components of value based management; and key success factors for the implementation of value based management principles were investigated. A further literature study was done to identify possible value drivers in a pharmacy business. An empirical study was conducted among registered pharmacists in the North West region of South Africa. Using the value drivers identified in the literature study as constructs, a questionnaire was designed to explore participants’ level of exposure to (and knowledge of) value based management as well as the extent to which the principles of value based management were being applied at the pharmacy businesses where participants were employed. Analysis of the responses showed the questionnaire to be reliable and valid. The results of the study highlighted that many respondents’ lack knowledge regarding the constructs (value drivers), cost price in the dispensary and cost of wages. Constructs (value drivers) that were better understood included product mix in the front shop and debtors’ control. Constructs (value drivers) that were best managed at the pharmacies where participants were employed, were cost price in the front shop and stock control. Constructs (value drivers) that were not as thoroughly managed were sales growth in the front shop and cost of wages. Conclusions regarding the findings of the research study were presented and recommendations were made. The research study was evaluated opposite the primary and secondary objectives with the conclusion that both were achieved. Finally, recommendations for further research into value based management and the application of its principles in pharmacy businesses were proposed. / Thesis (MBA)--North-West University, Potchefstroom Campus, 2013.

Value based management is a process that can be used to determine a business’s value drivers. It attempts to determine how the drivers link to value creation, and then break down the value drivers into achievable activities that can be pursued by employees. Due to strict medicine pricing regulations in the country, it is becoming increasingly difficult for pharmacy businesses to stay profitable. This study set out to develop a value based management framework that could be used by pharmacy management in order to maximise value creation in the business and help ensure its survival despite the strict pricing regulations. Secondary objectives were to contextualise the term “value based management”, to identify the value drivers in a pharmacy business and to determine the extent to which value based management and its principles are being applied in pharmacies in the North West region of South Africa. The research study began in the literature where the term “value based management” was introduced and a literature study was done to conceptualise the term by investigating why value based management and value creation were important. Value based management metrics, the components of value based management; and key success factors for the implementation of value based management principles were investigated. A further literature study was done to identify possible value drivers in a pharmacy business. An empirical study was conducted among registered pharmacists in the North West region of South Africa. Using the value drivers identified in the literature study as constructs, a questionnaire was designed to explore participants’ level of exposure to (and knowledge of) value based management as well as the extent to which the principles of value based management were being applied at the pharmacy businesses where participants were employed. Analysis of the responses showed the questionnaire to be reliable and valid. The results of the study highlighted that many respondents’ lack knowledge regarding the constructs (value drivers), cost price in the dispensary and cost of wages. Constructs (value drivers) that were better understood included product mix in the front shop and debtors’ control. Constructs (value drivers) that were best managed at the pharmacies where participants were employed, were cost price in the front shop and stock control. Constructs (value drivers) that were not as thoroughly managed were sales growth in the front shop and cost of wages. Conclusions regarding the findings of the research study were presented and recommendations were made. The research study was evaluated opposite the primary and secondary objectives with the conclusion that both were achieved. Finally, recommendations for further research into value based management and the application of its principles in pharmacy businesses were proposed. / Thesis (MBA)--North-West University, Potchefstroom Campus, 2013.

The primary goal of a publicly traded company is to maximise the wealth of its shareholders. This implies that the management of the firm, as agents of the owners, has to manage the firm in such a manner as to create value from every decision taken. Value-based management (VBM) is a management strategy aimed at achieving shareholder wealth creation and is based on the effective management of a set of internal value drivers to maximise wealth creation. The primary objective of the current study is to investigate the quantification of the relationship between internal value drivers and shareholder wealth creation in the Mining sector of JSE listed companies in South Africa. In order to achieve this, the internal value drivers were identified from literature, the necessary financial data was collected and the value drivers as well as actual shareholder wealth were quantified. Revenue growth, operating profitability, capital requirements and weighted average cost of capital (WACC) were identified as the value drivers while total shareholder return (TSR) was identified as the actual shareholder wealth creator. For the purpose of the current study, WACC was excluded from the analysis. By application of linear regression, it was found that revenue growth and operating profitability have a positive, statistically significant effect of TSR. After analysing the effect size, it is however concluded that the effect is not practically significant. These findings concur with similar research in the field of VBM. / Thesis (M.B.A.)--North-West University, Vaal Triangle Campus, 2009.

The primary goal of a publicly traded company is to maximise the wealth of its shareholders. This implies that the management of the firm, as agents of the owners, has to manage the firm in such a manner as to create value from every decision taken. Value-based management (VBM) is a management strategy aimed at achieving shareholder wealth creation and is based on the effective management of a set of internal value drivers to maximise wealth creation. The primary objective of the current study is to investigate the quantification of the relationship between internal value drivers and shareholder wealth creation in the Mining sector of JSE listed companies in South Africa. In order to achieve this, the internal value drivers were identified from literature, the necessary financial data was collected and the value drivers as well as actual shareholder wealth were quantified. Revenue growth, operating profitability, capital requirements and weighted average cost of capital (WACC) were identified as the value drivers while total shareholder return (TSR) was identified as the actual shareholder wealth creator. For the purpose of the current study, WACC was excluded from the analysis. By application of linear regression, it was found that revenue growth and operating profitability have a positive, statistically significant effect of TSR. After analysing the effect size, it is however concluded that the effect is not practically significant. These findings concur with similar research in the field of VBM. / Thesis (M.B.A.)--North-West University, Vaal Triangle Campus, 2009.

Theories of nuclear weapons proliferation cannot fully account for the nuances of certain cases because proliferation is a complex process involving numerous variables, the importance of which can potentially shift across time. This seems especially true when applied to the case of the Democratic People’s Republic of Korea (DPRK) where motivations have shifted in relevance numerous times in its proliferation history. In order to investigate this, this thesis reviews extant theories of nuclear proliferation and their ability to explain the case of the DPRK by critically examining its historical nuclear progress and nuclear weapons ambitions across time. The result is that indeed, proliferation theories are ill-equipped to completely account for the DPRK’s nuclear choices. The DPRK has ostensibly been motivated by numerous variables at different times, each having varying degrees of influence, inexplicable for mono-causal and often western and ethno-centric accounts of its proliferation motivations.

The UK Government has set the target of reducing CO2 emissions by 60% by 2050. Energy used by buildings is presently responsible for around half of C02 emissions in the UK. There are many established methods for reducing such emissions from building operation but these opportunities are not being seized to their full potential. One of these methods is the use of Alternative Energy Technologies (AETs) integrated into the built environment. Engineering consultants have a key role in the design of buildings, their energy consumption and the consideration of AETs. The objectives of this thesis are to explore the process of delivery of AETs in building projects, the key factors that influence the viability of these technologies and the capability of engineering consultants to increase their rate of uptake. While there are many published lists of incentives and restrictions to using these technologies, there are few reports of their impact in practical contexts. Project involvement provided evidence of significant variations in the drivers and barriers to using AETs, the design team perceptions and the approaches used for assessments. These insights were investigated in detail through participative research techniques. Initial focus groups led to the development of a structured interview programme administered in 2 phases. The first phase of interviews investigated the experiences of 41 participants representing a range of building project stakeholders. The second phase of interviews looks more closely at 24 relevant projects from the perspective of the engineering consultant, investigating the decision-making approaches used and the influence of factors throughout the design process in more detail. As a result a hierarchy of the importance of specific drivers and barriers to using AETs in building projects was established. It was found that there is a large amount of variation in their importance between projects. Despite this variation the emphasis for assessment methods is on financial terms, largely ignoring more qualitative concerns. This lack of suitable assessment methodologies along with a lack of education, motivation and case study information in the building industry are restricting the use of AETs in UK building projects. It is proposed that to address this, engineering consultants need to be better informed and need to develop and embrace more holistic technology assessment methods that account for qualitative and quantitative considerations.

Older adults are at an increased risk for motor-vehicle collisions (MVCs) once distance driven is considered, a finding that is partly attributed to a decline in attention related processes associated with age. MVCs typically occur in highly specific areas, suggesting a role of the complexity of the driving environment contributing to the occurrence of MVCs. The goal of this thesis was to explore the attentional demands of simulated driving events of varying complexity among young, mature and older drivers. In the present studies, attentional demand associated with driving was assessed through the peripheral detection task (PDT), a method in which a stimulus unrelated to the driving task is presented and drivers manually respond immediately upon its detection; latency to respond is recorded. The complexity of the driving environment was operationalized in terms of vehicle handling and of information processing elements. In the first study, inexperienced drivers completed a series simulated driving scenarios that varied according to their information processing and vehicle handling demands. The results showed a reduction in PDT performance at intersections where information processing is increased as well as when handling maneuvers behind a lead vehicle were required. Building on these findings, the second study employed the identical protocol as the first but examined differences in attentional demand between mid-aged and older drivers. The results indicated that when information processing demands were increased through the addition of traffic, and buildings, all participants exhibited greater workload regardless of age. The third study presented young, mid-aged, and older drivers with a simulated driving assessment course and administered several cognitive tasks. The results of the third study supported the hypothesis in that complex driving situations elicited greater attentional demand among drivers of all ages. Older adults showed greater attentional demand in comparison to young and mid-aged adults even after controlling for baseline response time. Older drivers also scored poorer on a global measure of driving safety. The results of this thesis highlight the roles of intrinsic and extrinsic factors involved in safe driving and are discussed in terms of appropriate interventions to improve road safety.