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Search Results: 1 - 10 of 14852 matches for " Heeran Chun "
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A closer look at the increase in suicide rates in South Korea from 1986–2005
Jin-Won Kwon, Heeran Chun, Sung-il Cho
BMC Public Health , 2009, DOI: 10.1186/1471-2458-9-72
Abstract: We used data on total mortality and suicide rates from 1986 to 2005 published online by the Korean National Statistical Office (NSO) and extracted data for individuals under 80 years old. The analyses of the trends for 1) the sex-age-specific total mortality rate, 2) the sex-age-specific suicide rate, and 3) the sex-age-specific proportional suicide rate in 1986–2005 were conducted. To demonstrate the birth cohort effect on the proportional suicide rate, the synthetic birth cohort from 1924 to 1978 from the successive cross-sectional data was constructed.Age standardized suicide rates in South Korea increased by 98% in men (from 15.3 to 30.3 per 100,000) and by 124% in women (from 5.8 to 13.0 per 100,000). In both genders, the proportional increase in suicide rates was more prominent among the younger group aged under 45, despite the absolute increase being attributed to the older group. There were distinct cohort effects underlying increasing suicide rates particularly among younger age groups.Increasing suicide rates in Korea was composed of a greater absolute increase in the older group and a greater proportional increase in the younger group.Suicide is a dramatic example of individual behaviour influenced by social integration or regulation, as originally noted by Durkheim [1]. Therefore, not only individual factors but also socioeconomic changes should be considered to explain suicide patterns in a society. According to World Health Organisation (WHO) statistics from 1965 to 1999, suicide rates had a variation and showed mixed trends between countries and age-groups. While total suicide mortality rates in all ages have been decreasing or in a steady status in most developed countries after 1990s, it has been increasing in some countries especially which have suffered huge economic turmoil such as Russia. There are some reports on suicide rates by age group. In a few countries including New Zealand and Australia, there were rising trends in young people [2,3]. I
Development of a single base extension method to resolve Y chromosome haplogroups in sub-Saharan African populations
Thijessen Naidoo, Carina M Schlebusch, Heeran Makkan, Pareen Patel, Rajeshree Mahabeer, Johannes C Erasmus, Himla Soodyall
Investigative Genetics , 2010, DOI: 10.1186/2041-2223-1-6
Abstract: Seven multiplex assays, which incorporated 60 Y chromosome markers, were developed. These resolved Y chromosomes to 61 terminal branches of the major African haplogroups A, B and E, while also including a few Eurasian haplogroups found occasionally in African males. Following its validation, the assays were used to screen 683 individuals from Southern Africa, including south eastern Bantu speakers (BAN), Khoe-San (KS) and South African Whites (SAW). Of the 61 haplogroups that the assays collectively resolved, 26 were found in the 683 samples. While haplogroup sharing was common between the BAN and KS, the frequencies of these haplogroups varied appreciably. Both groups showed low levels of assimilation of Eurasian haplogroups and only two individuals in the SAW clearly had Y chromosomes of African ancestry.The use of these single base extension assays in screening increased haplogroup resolution and sampling throughput, while saving time and DNA. Their use, together with the screening of short tandem repeat markers would considerably improve resolution, thus refining the geographic ancestry of individuals.The Y chromosome has demonstrated its utility, for a number of years, in shedding light on human history and identifying population affinities. Given that human genome variation evolves over time due to several factors - among them mutation, genetic drift, migration and selection - the genome has retained some of the record of these historical and evolutionary events. This record is more easily read from the Y chromosome due to the lack of recombination along most of its length and a strict paternal mode of transmission. Consequently, the Y chromosome has become a marker of the male contribution to the shaping of human populations and their histories.A standard nomenclature established by the Y Chromosome Consortium [1] resolved the global pattern of Y chromosome variation into 18 major haplogroups that were classified using capital letters A through to R. This has
Social Influence of Migrant Workers’ ICT Using in China  [PDF]
Chun Mao
Advances in Applied Sociology (AASoci) , 2014, DOI: 10.4236/aasoci.2014.42007
Abstract:

Social influence is one of the most important factors in changing one’s behavior. There are many factors included in social influence of migrant workers’ information communication technology (ICT) using in China. For example, family, friends, related agencies such as Trade Union and the Department of human resources and social security, and the leaders of villages, play important roles in influencing the migrant workers community to use ICT equipment. The primary research method is quantitative. There are 200 migrant worker respondents from 4 provinces. The result indicates that social influence on migrant workers’ ICT usage is not high. Colleagues, family, and villagers do influence migrant workers’ use of ICT. The lowest mean score in this research is relating to the relevant migrant workers agencies.

Research on Undergraduate Students’ Usage Satisfaction of Mobile Learning  [PDF]
Chun Mao
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.58072
Abstract:


This research focuses on the usage satisfaction of mobile learning among undergraduate students, and adopts the structure of close-ended and the Likert-Scale five-point measure questionnaire. There are 300 respondents from Southwest University. The questionnaires are randomly delivered to students from different majors and grades. The result indicates: 1) most of the undergraduate students are satisfied with mobile learning (76%) and will use mobile learning in future learning (84%). 2) More than half of the respondents have benefited from mobile learning, especially in quickly solving problems encountered in learning and making better use of learning time. 3) Undergraduate students are satisfied with the text content and image content in mobile learning, but the video content gets few agreements (11.4%). 4) The item “I am satisfied with the mobile learning resources provided by my university” gets the lowest mean score (M = 2.15), so teachers and universities should pay more energy and effort to promote the quality of mobile learning resources.


Friends and Relaxation: Key Factors of Undergraduate Students’ WeChat Using  [PDF]
Chun Mao
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.58075
Abstract:


This paper aims to study the factors of undergraduate students’ WeChat using, and adopts the structure of close-ended and the Likert-scale five-point measure questionnaire. We choose 200 undergraduate students as the respondents, randomly from different majors and grades. The result indicates: 1) almost all of the respondents use WeChat every day, and 18.8% of them use WeChat more than 2 hours per day. 2) The influence of friends is a major factor in using WeChat among undergraduate students. The item “Most of my friends use WeChat and encourage me to use” and “WeChat helps me to keep in touch with friends” recorded the highest and second highest mean score (4.03; 3.97). 3) WeChat is a good way to release stress and relaxation for undergraduate students. It brings them more laughter and joy. 4) Family has no significant influence on WeChat using, and only 10% of the respondents agree with the item “I often chat with strangers in WeChat”.


The Measurement of Analysts’ Earnings Forecast Uncertainty  [PDF]
Chun Hu
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.64041
Abstract: Analysts’ earnings forecast began in the early 20th century in America, researchers and investors are especially interested in estimating uncertainty about future earnings, because it reveals important characteristics of the firm’s information prior to the release of accounting results. Since uncertainty is inherently unobservable, evaluating its estimates poses challenging methodological problems. As a result, researchers have put forward alternative proxies for earnings forecast uncertainty. Here, we will review the measurement used in the study of foreign scholars of analysts’ earnings forecast uncertainty, and make a comparison among various methods. Considering the background of information, prediction model and analysts cannot be expected to know the cause of the situation, GARCH as an ex ante measure, will be one of the most accurately measures of uncertainty. Studying the methods of analysts’ earnings forecast uncertainty will be conducive to market participants to understand the characteristics of analysts’ earnings forecast, so as to make more rational decisions.
Pregnancy Incidence and Correlates in a Clinical Trial Preparedness Study, North West Province South Africa
Candice M. Chetty-Makkan, Katherine Fielding, Paul J. Feldblum, Matt A. Price, Petra Kruger, Heeran Makkan, Salome Charalambous, Mary H. Latka
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095708
Abstract: Introduction Women in HIV prevention trials often must typically agree to avoid pregnancy. Regardless, some become pregnant. Screening tools predicting pregnancy risk could maximize trial safety and efficiency. Objectives We assessed incidence and correlates of pregnancy among women at high HIV risk. Methods We enrolled sexually-active, HIV-negative women into an observational cohort (2008–2011). At enrolment demographic, contraceptive, reproductive, pregnancy intention and behavioural data were collected. Women reported if one or both partners wanted or intended for the couple to become pregnant. We measured gender role beliefs using a locally validated eight-point index. We tested HIV and pregnancy, and inquired about sexually transmitted infection symptoms (STIs) at enrollment and monthly. HIV testing included behavioural counselling and condom provision, but did not specifically counsel women to avoid pregnancy. Cox proportional hazard modelling evaluated the associations with pregnancy. The multivariate model included the following variables “Recent pregnancy attempts”, “Gender Roles Beliefs”, ”Self-reported STIs” and “Age”. Results We screened 1068 women and excluded (24.6%, 263/1068) who did not report risk behaviour. Non-pregnant, non-sterilized women aged 18–35 (median = 21 years) enrolled (n = 438). Most women reported one partner (74.7%) and a prior live birth (84.6%). Median follow-up time was 6 months (range 0.7–15.5). Pregnancy incidence was 25.1 per 100 women-years (n = 57 pregnancies). Conservative beliefs on gender roles (Adjusted Hazard Ratio (aHR) 1.8; 95% confidence interval [CI] 1.1–2.9), recent pregnancy attempts (aHR 1.9; 95% CI 1.1–3.4) and baseline self-reported STI (aHR 2.5; 95% CI 1.4–4.4) were associated with increased incident pregnancy. Report of no pregnancy intention was associated with lowered pregnancy risk (aHR 0.3; 95% CI 0.1–0.7). Conclusions We identified new and confirmed existing factors that can facilitate screening for pregnancy risk.
FEL-H Robust Control Real-Time Scheduling  [PDF]
Bing Du, Chun Ruan
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.21010
Abstract: The existing scheduling algorithms cannot adequately support modern embedded real-time applications. An important challenge for future research is how to model and introduce control mechanisms to real-time systems to improve real-time performance, and to allow the system to adapt to changes in the environment, the workload, or to changes in the system architecture due to failures. In this paper, we pursue this goal by formulating and simulating new real-time scheduling models that enable us to easily analyse feedback scheduling with various constraints, overload and disturbance, and by designing a robust, adaptive scheduler that responds gracefully to overload with robust H∞ and feedback error learning control.
Integral Inequalities of Hermite-Hadamard Type for Functions Whose 3rd Derivatives Are s-Convex  [PDF]
Ling Chun, Feng Qi
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.311232
Abstract: In the paper, the authors find some new inequalities of Hermite-Hadamard type for functions whose third derivatives are s-convex and apply these inequalities to discover inequalities for special means.
Modeling a Married Couple’s Reciprocal Relationship  [PDF]
Tin-Chun Lin
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.31002
Abstract:

A model was developed and a static game of complete information was applied in an examination of a married couple’s reciprocal relationship. Each chose best strategies (i.e., optimal responses) to maximize payoffs (i.e., happiness). Theoretical analysis suggests that the couple’s happiness is endogenously and positively correlated and simultaneously determined. If the wife (or the husband) is not happy with the relationship, it is impossible for the husband (or the wife) to be happy with the relationship.

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