<p>Diss. (sammanfattning) Umeå : Umeå universitet, 1992, härtill 6 uppsatser.</p> / digitalisering@umu

Although interest inventories have a long history in the field of career counseling, vocational interests have received limited attention in Industrial-Organizational (I-O) psychology. To assess the potential utility of interest inventories in the field of I-O psychology, 82 I-O psychologists with expertise in employee selection and equal employment opportunity law completed a survey assessing their expert opinion on the utility of interest inventories for employee selection decisions. Opinion on potential legal liability and discriminatory impact of the use of interest inventories was also assessed. Hypothesis 1, which stated a majority of respondents would indicate they have little to moderate knowledge of vocational interests, was supported. Hypothesis 2, which stated a majority of respondents would indicate agreement that interest inventories can be used for employee selection, was not supported. Hypothesis 3, which stated a majority of respondents would indicate agreement that more research into interest inventories is warranted, was supported. Hypothesis 4, which stated majority of respondents would indicate that the use of interest inventories would likely lead to legal liability for the employer, was not supported. Additional analyses were run to investigate other relationships of interest. Results of additional analyses indicated that participants indicated that interest inventories could be utilized in positive selection contexts as interest inventories likely may have incremental validity over traditional selection instruments. However, experts did not expect utility for interest inventories in negative selection contexts. Consequently, the results of this study indicate interest inventories likely have an array of useful applications in I-O psychology. Further research is warranted to determine which of these applications will provide utility and whether or not selection contexts will prove to be among those applications. Additional implications and limitations of findings are discussed, and directions for future research are considered.

Following [10] we continue the study of the problem of expected utility maximization in incomplete markets. Our goal is to find minimal conditions on a model and a utility function for the validity of several key assertions of the theory to hold true. In [10] we proved that a minimal condition on the utility function alone, i.e. a minimal market independent condition, is that the asymptotic elasticity of the utility function is strictly less than 1. In this paper we show that a necessary and sufficient condition on both, the utility function and the model, is that the value function of the dual problem is finite. (authors' abstract) / Series: Working Papers SFB "Adaptive Information Systems and Modelling in Economics and Management Science"

Preventative interventions often demand that resources be consumed in the present in exchange for future benefits. Cost-effectiveness analysis is a tool to understand these trade-offs, and inform decision-making under resource constraints. Targeted testing and treatment (TTT) for latent tuberculosis infection (LTBI) consists in identifying people at high risk for LTBI for preventive treatment to decrease the risk of active tuberculosis disease (ATBD). The state of Tennessee began conducting TTT statewide in 2001. This study uses a decision tree to evaluate the cost and outcomes of TTT for LTBI in Tennessee, compared to passive ATBD case finding (PACF). Key probabilities were obtained from the Tennessee TTT program and the literature. Outcomes are measured in terms of Quality Adjusted Life Years (QALY). The cost-effectiveness threshold was $100,000/QALY saved. One-way sensitivity analyses around factors related to study design, the program’s environment, and program performance were conducted, as was probabilistic sensitivity analysis (PSA) which takes into account the uncertainty in multiple parameters simultaneously. The base case, with a 25-year analytic horizon and 3% discount rate, shows that TTT prevents 47 ATBD cases, and saves 31 QALYs per 100,000 patients screened at a societal cost of $12,579 per QALY saved. Sensitivity analyses identified value thresholds that would trigger a change in preferred policy. PSA shows that the likelihood that TTT would be cost-effective is low. Decision makers should carefully assess the characteristics of the local TB epidemic and expected program performance to determine whether TTT is preferable over PACF from a cost-effectiveness viewpoint.

This is a prospective, non-randomized pilot study comparing the cost-utility of hepatic resection, radiofrequency ablation (RFA), systemic chemotherapy, and symptom control only for the treatment of colorectal liver metastases. Seven patients underwent hepatic resection, 7 underwent RFA, 20 received chemotherapy, and 6 received symptom control alone. Liver resection provided an average of 2.51 QALY’s compared to 1.99 QALY’s for RFA, and 1.18 QALY’s for chemotherapy, and 0.82 QALY’s for symptom control alone. The costs were $20,122, $ 15,845, $15,069, and $3,899, respectively. The cost-utilities of liver resection and RFA were similar at $8,027 and $7,965 per QALY, respectively, although patients receiving RFA generally had more advanced disease. The cost-utility of chemotherapy was $12,751/QALY and the cost-utility of symptom control alone was $4,788/QALY. RFA is still a relatively new. However, if long-term survival proves promising, it may prove to be a viable alternative to liver resection.

Self-adaptive and self-managing systems optimize their own behaviour according to high-level objectives and constraints. One way for human administrators to effectively specify goals for such optimization problems is using policies. Over the past decade, researchers produced various approaches, models and techniques for policy specification in different areas including distributed systems, communication networks, web services, autonomic computing, and cloud computing. Research challenges range from characterizing policies for ease of specification in particular application domains to categorizing policies for achieving good solution qualities for particular algorithmic techniques. The contributions of this thesis are threefold. Firstly, we give a mathematical formulation for each of the three policy types, action, goal and utility function policies, introduced in the policy framework by Kephart and Walsh. In particular, we introduce a first precise characterization of goal policies for optimization problems. Secondly, this thesis introduces a mathematical framework that adds structure to the underlying optimization problem for different types of policies. Structure is added either to the objective function or the constraints of the optimization problem. These mathematical structures, imposed on the underlying problem, progressively increase the quality of the solutions obtained when using the greedy optimization technique. Thirdly, we show the applicability of our framework through case studies by analyzing several optimization problems encountered in self-adaptive and self-managing systems, such as resource allocation, quality of service management, and Service Level Agreement (SLA) profit optimization to provide quality guarantees for their solutions. Our approach combines the algorithmic results by Edmonds, Fisher et al., and Mestre, and the policy framework of Kephart and Walsh. Our characterization and approach will help designers of self-adaptive and self-managing systems formulate optimization problems, decide on algorithmic strategies based on policy requirements, and reason about solution qualities. / Graduate / 0984

1. The problem and objective of study Workers in physically demanding jobs have, over the last decade, shown a high incidence of work-related injuries as well as other related physical disorders (Dempsey & Hashemi, 1999:183; Mital & Ramakrishnan, 1999:74; WHO, 1999:1; Weir & Nielson, 2001:128; Cox et al, 2003:6). This has been shown to lead to absenteeism, lost work time and poor work quality which in turn give rise to increased costs of yearly worker compensation claims, medical treatment and general loss of production (Ciriello & Snook, 1999:149; Mital, 1999:246-247; Cox et al., 2003:6). For example, the World Health Organization indicates that work related injuries and illness kill an estimated 1.1 million people worldwide every year. This is roughly equal to the number of worldwide deaths due to malaria each year (WHO, 1999:1). Research indicates that these types of injuries and/or work disability usually occur when the physical demands of the work tasks exceed the physical work capacity of the worker (Chaffin, 1974:251-254; Fraser, 1992:24; Shrey, 1997a:8). Two types of workers are usually pointed out by management in this regard, namely the older workers and females that are exposed to tasks with a high physical demand (Ayoub & Mital, 1989:9; Smith & Mustard, 2004:755; Sluiter, 2006:438). The above-mentioned problem seems to be a global concern (Mital, 1999:246; WHO, 1999:1) and forces companies to better manage the physical incapacity of workers in physical demanding jobs. The management of the electricity supply company in South Africa (hereafter the company) who realised that this problem was also prevalent in their workforce, developed minimum physical ability task requirements, that represent the physical work demands, for all the physically demanding jobs (Lubbe, 2003b:4). These minimum requirements enable the company to determine which workers do not have the physical work capacity to perform their physical work demands and to implement the necessary management process, such as a worksite wellness program, to address the problem. Hence the objective of the study were to determine the: a) role of gender on the physical work capacity profile of workers in the company based on the minimum physical ability task requirements of their job; b) role of age on the physical work capacity profile of workers in the company based on the minimum physical ability task requirements of their job; c) effect of a worksite wellness program on the physical work capacity profile of workers in the company based on the minimum physical ability task requirements of their job. 2. Summary of results a) The physical work capacity of male workers in this population are practically significant greater than that of female workers with the same job-related minimum physical ability task requirements. b) Practically significant more female workers do not have the minimum physical work capacity required by their job, than male workers. c) The physical work capacity of workers in physically demanding jobs within this company declines with aging. d) The age-related decline in physical work capacity for male workers is to such an extent that from the age of 60, the physical work demands of their job exceed their physical work capacity. e) The age-related decline in physical work capacity for female workers is to such an extent that, in general, the indication is that they will never have the required physical work capacity based on the minimum physical ability task requirements of their job, for it is predicted that from the age of 18, the physical work demands of their job exceed their physical work capacity. f) A worksite wellness program assists workers whose physical work capacity profile does not meet the minimum physical ability task requirements of their job, to regain the required physical work capacity. g) A worksite wellness program provide an alternative option to managing the physical work capacity of their workers, other than ill-health retirement, retrenchments or prolonged sick-leave. / Thesis (Ph.D. (Human Movement Science))--North-West University, Potchefstroom Campus, 2008.

This thesis explores the 'theories of Bataille and Baudrillard' in relation to the problem of extreme violence. The particular events of concern are the death of James Bulger, the Dunblane massacre and the 'serial killers' Frederick and Rosemary West. The thesis argues that dominant traditions in the social sciences are unable to engage with the horror of such events with anything approaching adequate terminology and that alternatives are urgently required. The study is theoretical not empirical and these cases act as crucial reference points throughout the theoretical discussions. Such events seem to disable reason and are frequently referred to as 'inexplicable' or 'evil'. They appear to be 'in excess' of the established explanatory paradigms. The thesis investigates the possibility of 'thinking excess' in new and alternative ways, more commensurate with the intensity of such events. The importance of Bataille notions of the sacred, sacrificial expenditure and non-dialectical negativity in approaching changing forms of extreme violence are emphasised. Bataille specifies a fundamental 'need' for violent expenditure or sacrifice that persists in a contemporary age no longer equipped to recognise these principles. Baudrillard's approach is related but departs from Bataille's thought. Baudrillard's emphasis on symbolic exchange, seduction and the fatal denies the existenceo f fundamental 'needs' yet also emphasisesth e cultural and ritual nature of extreme violence. These themes are developed into a detailed reading of 'deathevents'. They are theorised as distinctively contemporary, occupying a postdialectical cultural space characterised by the elimination of sacred and symbolic principles, which nevertheless endure in fragmentary, displaced and deracinated form. These are conditions in which new forms of 'evil' may emerge. In emphasising the theoretical differences between the readings of violence offered by Bataille, and by Baudrillard, the thesis rey-eals shifts in the nature of radical theory from the middle to the late twentieth century. The notions of utility, limit and excess are central to this shift and to alternative ways of thinking the excessive nature of contemporary violence.

Background: Variation exists in quality of life (i.e., utility) estimates depending on the utility elicitation method utilized. Using the EQ-5D, VAS, and HUI-III, the aim of this thesis was to determine whether these measures adequately capture HRQOL in a CRC population and assess the relationship between utility estimates generated. Methods: A mixed methods study design was employed to collect health status scores and interview data from a sample of 50 CRC patients in Toronto, Ontario. Results: Mean utility scores between the EQ-5D and HUI-III were identical at 0.76 (95% CI), with an overall VAS score of 0.72 (95% CI). Conclusion: The fact that the EQ-5D and HUI-III resulted in identical mean utility scores provides assurance for future studies using these tools in CRC. However, many factors that CRC patients identify as important to their HRQOL are not captured by these instruments. These findings have implications for informing economic evaluations.

An economic evaluation of the three interventions to conceive without the sexual transmission of HIV between heterosexual, HIV-discordant couples with positive male partners can inform policy decisions to subsidize pregnancy planning in this setting, as there is currently no coverage as such in Ontario. A decision tree and Markov model were designed to determine the short and long-term outcomes of unprotected intercourse restricted to timed ovulation (UIRTO), sperm washing with intrauterine insemination (SWIUI), and unprotected intercourse restricted to timed ovulation with pre-exposure prophylaxis (UIRTO-PrEP). In the short-term, UIRTO was the most cost-effective strategy. In the long-term, cases of negligible HIV transmission risk determined UIRTO-PrEP as the preferred option, while SWIUI was the choice method when this risk was high. There remains a viable risk of HIV transmission between discordant couples during attempts to conceive that require the concurrent and subsidized use of UIRTO-PrEP or SWIUI to protect against HIV infection.