Tremendous pressure is being placed on organisations to improve their work performance and to become increasingly competitive. In order to survive in a highly competitive economy, organisations in both the public and the private sector are undergoing major re-structuring and can no longer guarantee employees with life time employment, thus leading to job insecurity. A relatively large amount of research can be found in the literature regarding the relationship between job insecurity and various outcomes, for example, reduced job satisfaction and organisational commitment, and reduced well-being. Limited research has, however, been conducted on possible mediators of the job insecurity - outcomes relationship. Such research may be useful for the development of programmes to reduce the negative impacts of job insecurity. The primary objectives of this research were to investigate the relationship between job insecurity and general health of employees (N = 337) in both the public and the private sector, as well as to determine whether situational sense of coherence mediates the relationship between job insecurity and general health. A further objective was to compare the job insecurity levels of public and private sector employees. A cross-sectional survey design was used. Constructs were measured by means of the Job Insecurity Questionnaire (JIQ), the Orientation to Life Questionnaire (Form S), the General Health Questionnaire (GHQ) and a biographical questionnaire. Results indicated that a practically-significant relationship exists between job insecurity and general health, implying that high levels of job insecurity are associated with ill health (as displayed in somatic symptoms, anxiety and insomnia, and social dysfunction). Regression analyses confirmed the partially mediating effect of situational sense of coherence on the relationship between job insecurity and general health. It was also found that public sector employees displayed higher levels of affective job insecurity than their private sector counterparts. Conclusions and recommendations were made / Thesis (Ph.D.)--North-West University, Vaal Triangle Campus, 2006.

During the past few years, organisations throughout the public sphere have undergone dramatic changes due to extensive restructuring and mergers. These changes are caused international by an accelerating pace of business, increasing economic activity, science and technology, public partnerships involving government and population, changing demographics, and education and training. Changes such as these usually result in job insecurity which in turn may lead to job dissatisfaction. The objective of this study was to examine the possible relationship between job insecurity, job satisfaction and situational sense of coherence among civil servants in the Johannesburg-West District Education Department and, more particularly, to determine whether situational sense of coherence mediates the relationship between job insecurity and job satisfaction. A survey design was used to realise the research objectives. The study population consisted of 120 civil servants in the Johannesburg-West District of Education Department. The Job Insecurity Questionnaire (JIQ), the Minnesota Satisfaction Questionnaire (MSQ) and Orientation to Life Questionnaire - Form S (OLQ - S) were used as measuring instruments. The findings showed that a negative correlation of medium effect was found between cognitive job insecurity and situational sense of coherence. Total job satisfaction displayed negative statistically significant correlations with all the job insecurity dimensions, although these correlations fell below the practically significant cutoff point. Analyses indicated that situational sense of coherence does not hold a statistically significant amount of predictive value with regard to job satisfaction, nor does job insecurity hold a statistically significant amount of variance with regard to job satisfaction, implying that situational sense of coherence does not mediate the relationship between job insecurity and job satisfaction. Job insecurity was however found to hold some predictive value with regard to situational sense of coherence. Limitations were identified and recommendations with regard to future research as well as for the organisation were made. / Thesis (M.A. (Industrial Psychology))--North-West University, Vaal Triangle Campus, 2007.

The purpose of this study was to investigate the relationship between emotional intelligence, sense of coherence and coping behaviour in a group of students at a South African university. An availability sample of 101 students completed self-report measures of emotional intelligence, sense of coherence and coping behaviour. The measures were found to be valid and reliable in this particular group and the means and standard deviations calculated were comparable with those mentioned in literature. It was further found that emotional intelligence was better able, than sense of coherence, to predict the following coping strategies: turning to religion, suppression of competing activities, planning, active coping and problem solving. Emotional intelligence and sense of coherence were both good predictors of the coping strategy positive reinterpretation and growth. It was concluded that individuals with a high emotional intelligence have developed more effective coping strategies than individuals who do not have well-developed emotional abilities. Practical implications of the findings are indicated. / Thesis (M.A. (Psychology))--North-West University, Vaal Triangle Campus, 2005.

Tremendous pressure is being placed on organisations to improve their work performance and to become increasingly competitive. In order to survive in a highly competitive economy, organisations in both the public and the private sector are undergoing major re-structuring and can no longer guarantee employees with life time employment, thus leading to job insecurity. A relatively large amount of research can be found in the literature regarding the relationship between job insecurity and various outcomes, for example, reduced job satisfaction and organisational commitment, and reduced well-being. Limited research has, however, been conducted on possible mediators of the job insecurity - outcomes relationship. Such research may be useful for the development of programmes to reduce the negative impacts of job insecurity. The primary objectives of this research were to investigate the relationship between job insecurity and general health of employees (N = 337) in both the public and the private sector, as well as to determine whether situational sense of coherence mediates the relationship between job insecurity and general health. A further objective was to compare the job insecurity levels of public and private sector employees. A cross-sectional survey design was used. Constructs were measured by means of the Job Insecurity Questionnaire (JIQ), the Orientation to Life Questionnaire (Form S), the General Health Questionnaire (GHQ) and a biographical questionnaire. Results indicated that a practically-significant relationship exists between job insecurity and general health, implying that high levels of job insecurity are associated with ill health (as displayed in somatic symptoms, anxiety and insomnia, and social dysfunction). Regression analyses confirmed the partially mediating effect of situational sense of coherence on the relationship between job insecurity and general health. It was also found that public sector employees displayed higher levels of affective job insecurity than their private sector counterparts. Conclusions and recommendations were made / Thesis (Ph.D.)--North-West University, Vaal Triangle Campus, 2006.

During the past few years, organisations throughout the public sphere have undergone dramatic changes due to extensive restructuring and mergers. These changes are caused international by an accelerating pace of business, increasing economic activity, science and technology, public partnerships involving government and population, changing demographics, and education and training. Changes such as these usually result in job insecurity which in turn may lead to job dissatisfaction. The objective of this study was to examine the possible relationship between job insecurity, job satisfaction and situational sense of coherence among civil servants in the Johannesburg-West District Education Department and, more particularly, to determine whether situational sense of coherence mediates the relationship between job insecurity and job satisfaction. A survey design was used to realise the research objectives. The study population consisted of 120 civil servants in the Johannesburg-West District of Education Department. The Job Insecurity Questionnaire (JIQ), the Minnesota Satisfaction Questionnaire (MSQ) and Orientation to Life Questionnaire - Form S (OLQ - S) were used as measuring instruments. The findings showed that a negative correlation of medium effect was found between cognitive job insecurity and situational sense of coherence. Total job satisfaction displayed negative statistically significant correlations with all the job insecurity dimensions, although these correlations fell below the practically significant cutoff point. Analyses indicated that situational sense of coherence does not hold a statistically significant amount of predictive value with regard to job satisfaction, nor does job insecurity hold a statistically significant amount of variance with regard to job satisfaction, implying that situational sense of coherence does not mediate the relationship between job insecurity and job satisfaction. Job insecurity was however found to hold some predictive value with regard to situational sense of coherence. Limitations were identified and recommendations with regard to future research as well as for the organisation were made. / Thesis (M.A. (Industrial Psychology))--North-West University, Vaal Triangle Campus, 2007.

Behaviourists and Logical Positivists commendably set out to purge prejudiced arguments from science, but where it is obvious that there remains some sort of "ghost" in their rational "machine", it is self-defeating simply to ignore its existence. Freaud, Piaget, and the ethologists have made some progress in grasping this nettle -- moving towards a material explanation of the "other-worldly" properties of the individual -- but their models of the individual remain nebulously structured in their basic elements. Consequently such theories remain disturbingly controversial, and circumscribed in their applicability. [#] The present work accordingly sets out to bridge this gap by postulating plausible functions for existing micro-structure which could account both for observed behavioural phenomena, and for many of the existing vaguer theoretical constructs. Part A develops such an explanation for Piagetian constructs, while Part B fills in some of the technical details concerning quantitative problems of signal generation, transmission, and selective reception. [#] Part C applies these notions to other non-Piagetian descriptions and interpretations of psychological phenomena, thereby offering an integration and reconciliation of various schools of theory. (Major areas considered include Ashby's "homeostat" approach, biological self-organization, sleep-modes and dreaming, Freudian theories of neuroses, and various theories concerning psychosis). The basic theory itself is meanwhile developed in much greater detail. [#] A recurring theme throughout the work is the notion that knowledge-acquisition by any independent system depends not only on "external" interaction with the "real" world, but also on an active seeking for internal consistency within the resulting "internal" model. This concept is crucial to the study in two ways:- (i) The operation of the brain-systems being considered, and (ii) As a guuide to the methodology of the present study itself -- in an area where experimental data is uncomfortably sparse, and likely to remain so.

Purpose To examine soft contact lens fitting characteristics using anterior segment imaging techniques and comfort. The specific aims of each chapter are as follows: Chapter 2: To calibrate the new ZEISS VisanteTM anterior segment optical coherence tomographer (OCT) using references with known physical thickness and refractive index equal to the human cornea and to compare the Visante measures to those from a previous generation OCT (Zeiss-Humphrey OCT II). Chapter 3: The first purpose of this study was to measure the repeatability of the Visante TM OCT in a normal sample. The second was to compare corneal thickness measured with the Visante TM OCT to the Zeiss-Humphrey OCT II (model II, Carl Zeiss Meditec, Jena Germany) adapted for anterior segment imaging and to the Orbscan II TM (Bausch and Lomb, Rochester New York). Chapter 4: Conjunctival displacement observed with the edges of the contact lens, when imaged may be real or may be an artefact of all OCT imagers. A continuous surface appears displaced when the refractive index of the leading medium changes at the edge of a contact lens. To examine this effect, edges of the contact lenses were imaged on a continuous surface using the UHR-OCT. Contact lens edges on the human conjunctival tissue were also imaged to see if the lens indentation on the conjunctival tissue is real or an artefact at the edge of the lens. Chapter 5: The main purpose of this study was to determine if we can predict end of the day discomfort and dryness using clinical predictive variables. The second purpose of the study was to determine if there was any relationship between lens fitting characteristics and clinical complications and especially to the superior cornea and conjunctiva with a dispensing clinical trial. Methods Chapter 2: Twenty two semi-rigid lenses of specified thicknesses were manufactured using a material with refractive index of 1.376. Central thickness of these lenses was measured using VisanteTM OCT and Zeiss-Humphrey OCT II (Zeiss, Germany). Two data sets consisting of nominal measures (with a standard pachymeter of the lenses and one obtained using a digital micrometer) were used as references. Regression equations between the physical and optical (OCT) measures were derived to calibrate the devices. Chapter 3: Fifteen healthy participants were recruited. At the Day 1 visit the epithelial and total corneal thickness, across the central 10mm of the horizontal meridian were measured using the OCT II and the Visante TM OCT. Only total corneal thickness across the central 10mm of the horizontal meridian was measured using the Orbscan II. The order of these measurements was randomized. These measurements were repeated on Day 2. Each individual measurement was repeated three times and averaged to give a single result. Chapter 4: (2-D) Images of the edges of marketed silicone hydrogel and hydrogel lenses with refractive indices (n) ranging from 1.41-1.51 were taken placing them concave side down on a continuous surface. Five images for each lens were taken using a UHR-OCT system, operating at 1060 nm with ~3.2um (axial) and 10μm (lateral) resolution at the rate of 75,000 A-scans/s. The displacement of the glass slide beneath the lens edge was measured using Image J. Chapter 5: Thirty participants (neophytes) were included in the study and the four lenses (Acuvue Advance 8.3, Acuvue Advance 8.7, Pure Vision 8.3, and Pure Vision 8.6) were randomly assigned for each eye. The lenses were worn for a period of two weeks on a daily wear basis for 8 to 10hrs per day. Lens performance was monitored over the 2week period. Assessment of subjective comfort was made using visual analogue scales. Total corneal and epithelium thickness was measured using the Visante OCT, the lens edge profiles of the contact lenses were observed using the ultra-high resolution OCT and the conjunctival epithelial thinning was measured using the RTVue OCT. Conjunctival blood velocity was measured at the baseline and 2 week visit using a high magnification camera. Results Chapter 2: Before calibration, repeated measures ANOVA showed that there were significant differences between the mean lens thicknesses from each of the measurement methods (p<0.05), where Visante measurements were significantly different from the other three (OCT II, MG and OP) methods (p<0.05). Visante thickness was significantly higher than the microgauge measures (453±37.6 µm compared to 445.1±38.2 µm) and the OCT II was significantly lower (424.5±36.1 µm both, p<0.05). After calibration using the regression equations between the physical and optical measurements, there were no differences between OCT II and Visante OCT (p<0.05). Chapter 3: Mean central corneal and epithelial thickness using the Visante™ OCT after calibration at the apex of the cornea was 536± 27 µm (range, 563-509 µm) and 55± 2.3 µm (range, 57.3-52.7 µm), respectively. The mean corneal and epithelial thickness using OCT II at the apex was 520±25µm and 56±4.9 µm, respectively. The mean of total corneal thickness measured with the Orbscan II was 609±29µm. Visante OCT was the most repeatable for test-retest at the apex, nasal and temporal quadrants of the cornea compared to OCT II and Orbscan II. COR’s of Visante OCT ranged from ±7.71µm to ±8.98µm for total corneal thickness and ± 8.72 µm to ± 9.92 µm for epithelial thickness. CCC’s with Visante OCT were high for total corneal thickness for test-retest differences ranging from 0.97 to 0.99, CCC’s for epithelial thickness showed moderate concordance for both the instruments. Chapter 4: Results showed that artefactual displacement of the contact lens edge was observed when the lenses were imaged on the glass reference sphere, custom made rigid contact lenses (1.376) and on the conjunctival tissue. The displacement measured on the conjunctival tissue ranged from 7.0±0.86 µm for the Air Optix Night and Day to 17.4±0.22 µm for the Acuvue Advance contact lenses. The range of displacement with the soft lens edges imaged on the rigid contact lens was from 5.51±0.03 µm to 9.72±0.12 µm. Chapter 5: The lenses with the steepest sag (Acuvue Advance 8.3, Pure Vision 8.3) resulted not only with the tightest fit, but with compromise to the superior conjunctiva. This was especially seen with the Acuvue Advance lenses. The steeper lenses caused more total corneal swelling, superior epithelial thinning, mechanical compression of conjunctiva, conjunctival staining, bulbar hyperemia, conjunctival indentation and reduced blood flow at the lens edge. Not many associations were observed between baseline clinical and 2 weeks sensory variables. However, significant associations were observed when comparing the baseline clinical variables to end of the day sensory variables. Baseline clinical variables compared to 2 week clinical variables also showed significant correlations. Conclusions Chapter 2: Using reference lenses with refractive index of the cornea (1.376) allows rapid and simple calibration and cross calibration of instruments for measuring the corneal thickness. The Visante and OCT II do not produce measurements that are equal to physical references with refractive index equal to the human cornea. Chapter 3: There is good repeatability of corneal and epithelial thickness using each OCT for test-retest differences compared to the between instruments repeatability. Measurements of epithelial thickness are less repeatable compared to the total corneal thickness for the instruments used in the study. Chapter 4: When contact lenses are imaged in-situ using UHR-OCT the conjunctival tissue appeared displaced. This experiment indicates that this displacement is an artefact of all OCT imagers since a continuous surface (glass slide) was optically displaced indicating that the displacement that is observed is a function of the refractive index change and also the thickness of the contact lens edges. Chapter 5: Discomfort is a complex issue to resolve since it appears to be related to ocular factors such as the corneal and conjunctival topography and sagittal depth; to lens factors that is 1) how the sag depth of the lenses relate to the corneal/conjunctival shape and depth and therefore how well it moves on the eye. 2) Also with the lens material; whether they are high or low modulus, low or high water content, dehydration properties, wetting agents used and its resistance to deposits, lens edge profile and thickness and its interaction with the upper eyelid.

Thesis (BSc. (Hons))--Australian National University, 2002. / Available via the Australian National University Library Electronic Pre and Post Print Repository. Title from title screen (viewed Mar. 27, 2003). "November, 2002" "A thesis submitted in part fulfillment of the requirements for the degree of Bachelor of Science with Honours, from the Department of Physics, The Australian National University" Includes bibliographical references.

Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: vortex; coherence. Includes bibliographical references (p. 127-151).

Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: singularity; vortex; phase; diffraction; interference; nulling; singularities; coherence; dislocation; optical vortex. Includes bibliographical references (p. 123-146).