CONVERGENCE IMPROVEMENT OF ITERATIVE DECODERS

Iterative decoding techniques shaked the waters of the error correction and communications field in general. Their amazing compromise between complexity and performance offered much more freedom in code design and made highly complex codes, that were being considered undecodable until recently, part of almost any communication system. Nevertheless, iterative decoding is a sub-optimum decoding method and as such, it has attracted huge research interest. But the iterative decoder still hides many of its secrets, as it has not been possible yet to fully describe its behaviour and its cost function. This work presents the convergence problem of iterative decoding from various angles and explores methods for reducing any sub-optimalities on its operation. The decoding algorithms for both LDPC and turbo codes were investigated and aspects that contribute to convergence problems were identified. A new algorithm was proposed, capable of providing considerable coding gain in any iterative scheme. Moreover, it was shown that for some codes the proposed algorithm is sufficient to eliminate any sub-optimality and perform maximum likelihood decoding. Its performance and efficiency was compared to that of other convergence improvement schemes. Various conditions that can be considered critical to the outcome of the iterative decoder were also investigated and the decoding algorithm of LDPC codes was followed analytically to verify the experimental results

Alcohol Use and Mental Health Status Among University Students in Greece

Alcohol abuse is a common incident in college student’s communities. The purpose of this research study was to evaluate the rates of alcohol use among university students in Greece and to search if there is a relation between alcohol use disorders and mental health status (depression, anxiety, stress)

Emotional Intelligence and Caring Behaviors of Mental Health Nurses in Greece

The purpose of this descriptive study of correlation of the synchronic type is to investigate the level of Emotional Intelligence (EQ) and Caring Behaviors exhibited by nurses in mental health, as well as the relationship with their individual characteristics

Assessment of psychological distress in university students: A Quantitative study

Introduction: Psychological health is the expression of harmonic expression ofhuman’s personality and is often disrupted by multiple factors. Especially duringacademic years human has to confront various stressful situations that endanger hisPsychological health.Purpose: This study aims to assess psychological distress in university students and toexamine possible factors that are associated with it.Material and Methods: A cross sectional study was conducted in which 206 universitystudents were participated. Data were collected by the Hospital Anxiety and DepressionScale, HADS and a sheet contain information regarding demographic, social andacademic background special design for the purpose of the study. Spss v. 21 was usedfor analyzing data and the signicant level was set in p?0,05.Results: From the total of 206 students 76,2% were women (n=157) and 23,8% weremen with a mean age 30.1 ±7.15. Anxiety symptoms were negative associated withcohabitation and marital status (p=.019 and p=.001 respectively). While place ofresidence was also negative associated (p=.000).While monthly income and duration ofwere associated with the experience of anxiety symptoms. One the other handdepression was associated with sex (p=.004) place of residence and origins of students(p=.038 and p=.058 respectively). Finally the number of uncompleted courses andsexual preferences were associated with depression to (p=.009).Conclusions: Within the context of student life that is characterized by anxiety, crises ofinterpersonal relationships and uncertainty maintaining student’s mental health andwellbeing must be a top propriety among university services

Quality of life among elderly population

Introduction: Quality of Life (QoL) among elderly is an important issue that reflects the status of well-being of this vulnerable population. Aim: This study aims to assess quality of life among elderly population and to examine possible correlations with associated demographic, social and health factors. Material and Method: A cross sectional study was conducted, in which 257 elderlies from Greece were participated. For the data collection the WHOQOL-BREF (30-items Greek version) questionnaire was used as well as a questionnaire with questions about demographic data, social & health factors. Descriptive statistics such as frequencies, means, percentages and standard deviations have been utilized. Inferential statistics such as t-test and pearson r correlation have been used to determined correlations between relevant variables. Level of significance accepted is p < 0.05. Results: From the total 257 elderlies 55.6% (n=143) were women and 44.4% (n=114) were men with a mean age 75.12±8.39. The mean score of overall QoL is 14.14±2.87 and the mean of each factor of WHOQOL-BREF is 13.56±2.79 for physical health, 13.61±2.74 for mental health, 13.72±2.60 for social relationships and 13.70±1.96 for environment. Age, marital status, number of children, level of education, residence area, lifestyle, chronic diseases and serious illnesses are the factors that affects levels of QoL among Greek elderly population Conclusions: Results indicates that levels of QoL between elderly are moderate and many demographic, social and health factors are correlated with QoL status

Work place and prevalence of COVID-19 in a rural population in Greece

Introduction: Coronavirus disease-19 (COVID-19), caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has become a global pandemic, giving rise to a serious global health threat. Many countries including Greece have seen a two-wave pattern of reported cases, with a first wave in spring and a second in autumn of 2020. Methods: A cross-sectional seroprevalence study was designed to measure the prevalence of IgG antibodies with a quantitative SARS-CoV-2 IgG lab-based serology test, chemiluminescent microparticle immunoassay, against novel coronavirus in rural areas in Greece after the second pandemic wave. The study was conducted on 29 January 2021 in a rural semi-closed area, the municipality of Deskati, prefecture of western Macedonia in Greece after the second pandemic wave. Results: Sixty-nine participants were included in this study. The present study demonstrated a high prevalence of COVID-19 infection (31 of 69 total participants; 45%) and those who were working in the public sector were at higher risk of COVID-19 infection in comparison to their counterparts in private sector (p=0.05364), (relative risk 2.64; 95% confidence interval 1.001-7.086). Conclusion: The study presents data showing a high prevalence of herd immunity for COVID-19 in a semi-closed area in Greece. These findings might help to understand the characteristics of this second wave, the behaviour and danger of SARS-CoV-2 in rural areas in Greece and Europe generally

Greek Nurses' Perception of Hospital Ethical Climate: A Cross-Sectional Study

The present study aimed to examine Greek nurses’ perceptions about hospital ethical climate and to investigate the possible difference of those perceptions regarding their demographic and work-related characteristics. The cross-sectional study design was employed in this study in which 286 nurses and nurse assistants participated. Data were collected by a sheet containing demographic and work-related characteristics and the Greek version of Oslons’ Hospital Ethical Climate Scale. IBM Statistical Package for Social Sciences 25 was used in data analysis. Frequencies, means, percentages, and standard deviations summarized the data. For the statistical differences, parametric tests were performed. Independent Samples t and Pearson correlation analysis were used to determine the relationship between the ethical climate of the hospital and the nurses’ characteristics. The p-values 0.05 were considered statistically significant. The mean age of the nurses was 44 years (SD: 8.5 years; range 24–66 years). The majority of them were women (77.3%). A percent of 57.7% of the sample was married. Most positive perceptions were concerning managers (4.01) following by peers (3.82), patients (3.69), hospital (3.29) while the least positive perceptions of the ethical climate were concerning the physicians (3.16). The factors associated with hospital ethical perception were: working experience and responsible position. The highest score of ethical climate reported to Managers subscale, while the minimum score was related to Physicians. In general, Greek nurses reported positive perceptions regarding hospital ethical climate. The positive ethical climate is associated with a better working environment, fewer nurses’ experience of moral distress, fewer chances for nursing turnover, high quality of nursing care, and fewer errors in nursing practice

Synthesis and Characterisation of Iron Oxide Nanoparticles with Tunable Sizes by Hydrothermal Method

The present study investigates the effect of different reaction times on the crystallinity, surface morphology and size of iron oxide nanoparticles. In this synthetic system, aqueous iron (III) nitrate (Fe(NO$_3$)$_3\cdot9$H$_2$O) nonahydrate, provided the iron source and triethylamine was the precipitant and alkaline agent. The as-synthesised iron oxide nanoparticles were characterised by X-ray diffraction (XRD), Rietveld analysis, Scanning Electron Microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Prolonged reaction times indicated the change on nanoparticle shape from elongated nanorods to finally distorted nanocubes. Analysis on the crystallinity of the iron oxide nanoparticles suggest that the samples mainly consist of two phases, which are Goethite ($\alpha$-FeOOH) and Hematite $(\alpha$-Fe$_2$O$_3$), respectively