Ansiedad y desmotivación en el aprendizaje del inglés en estudiantes de tercer año de secundaria de Corea del Sur

Because of the high level of anxiety and academic pressure associated with the college entrance exam in South Korea, this study investigated the effects of English learning anxiety on English learning demotivation and academic achievement in third-year high school students. To determine the correlations of the effect of English learning anxiety on both components, 249 participants were selected from nine third-year student classes at an academic high school in Gyeonggi Province, South Korea, to complete questionnaires, the data from which were analysed using quantitative statistical methods. The regression analyses revealed that the English learning anxiety in the male and female students with top grades had positively and significantly affected their academic achievement. However, except for high-level male learners, demotivation was not found to have any effect on student achievement. The results suggested that it is important to design education-friendly measures to enhance third-year high school student motivation and alleviate any excessive anxiety.Debido al alto nivel de ansiedad y presión académica asociados con el examen de ingreso a la universidad en Corea del Sur, este estudio investigó los efectos de la ansiedad por aprender inglés en la desmotivación del aprendizaje del inglés y el rendimiento académico en estudiantes de tercer año de secundaria. Para determinar las correlaciones del efecto de la ansiedad por aprender inglés en ambos componentes, se seleccionaron 249 participantes de nueve clases de estudiantes de tercer año en una escuela secundaria académica en la provincia de Gyeonggi, Corea del Sur, para completar cuestionarios, cuyos datos se analizaron utilizando métodos cuantitativos métodos de estadística. Los análisis de regresión revelaron que la ansiedad por aprender inglés en los estudiantes masculinos y femeninos con las mejores calificaciones había afectado positiva y significativamente su rendimiento académico. Sin embargo, a excepción de los estudiantes varones de alto nivel, no se encontró que la desmotivación tuviera ningún efecto en el rendimiento de los estudiantes. Los resultados sugirieron que es importante diseñar medidas favorables a la educación para mejorar la motivación de los estudiantes de tercer año de secundaria y aliviar cualquier ansiedad excesiva

Study of the Top-quark Pair Production in Association with a Bottom-quark Pair from Fast Simulations at the LHC

A large number of top quarks will be produced at the Large Hadron Collider (LHC) for Run II period. This will allow us to measure the rare processes from the top sector in great details. We present the study of the top-quark pair production in association with a bottom-quark pair (ttbb) from fast simulations for the Compact Muon Solenoid (CMS) experiment. The differential distributions of ttbb are compared with the top-quark pair production with two additional jets (ttjj) and with the production in association with the Higgs (ttH), where the Higgs decays to a bottom-quark pair. The significances of ttbb process in the dileptonic and semileptonic decay mode are calculated with the data corresponding to an integrated luminosity of 10 fb-1, which is foreseen to be collected in the early Run II period. This study will be an important input in searching for new physics beyond the standard model as well as in searching for ttH process where the Yukawa coupling with the top quark can be directly measured.Comment: 12 pages, 12 figure

Alliance coordination effectiveness and the performance of international strategic alliances: development of the partnership and moderating role of market environment turbulence

The purpose of this dissertation was to investigate post-international strategic alliance (ISA) formation issues, which have been neglected in the ISA literature. The specific research questions were 1) how do ISA partners develop their relationships? 2) how does this relationship development impact effective management of resources contributed by each ISA partner? and 3) how does effective resource management influence ISA performance? Data were collected by mail and web surveys from those who were/are involved in ISA operations. Structural equation modeling using LISREL was employed to test the conceptual model and multiple regression analysis was adopted to test the moderating effects in the model. The model was modified by introducing second order factors to correctly interpret the relationships between factors and achieve a more parsimonious model. Results indicate that alliance partnership interactions between ISA partners (i.e., reciprocity, transparency, formal and informal communication, two-way and participative communication, and cultural sensitivity) positively influenced the development of desire for joint action between them which is based on trust and commitment. Desire for joint action positively influenced alliance coordination effectiveness (ACE: integration and utilization of resources) which underlies effective resource management between ISA partners. ACE positively affected ISA performance. Market environment turbulence (i.e., host government interference and technology turbulence), however, did not have moderating effects between ACE and ISA performance. The first question was answered by introducing alliance partnership interaction factors which influence the building of the positive relationship between ISA partners. The introduction of ACE explained how ISA partners manage the resources provided by each partner. The significant impact of ACE on ISA performance and the nonsignificant impact of the moderating variables indicate that ACE has strong impact on ISA performance that can absorb the effects of host government interference and technology turbulence in the operation of ISAs

Mild and moderate pre-dialysis chronic kidney disease is associated with increased coronary artery calcium.

BackgroundIt is increasingly evident that patients with chronic kidney disease (CKD) are more likely to die from heart disease than kidney failure. This study evaluated whether pre- dialysis CKD is an independent risk factor for coronary artery calcium (CAC).MethodsA total of 544 consecutive patients who underwent CAC scoring were analyzed. Eleven patients requiring hemodialysis were excluded. Patients were divided into three groups: normal glomerular filtration rate (GFR) (GFR > 90 mL/min/1.73 m²), mild CKD (90 ≥ GFR > 60 mL/min/1.73 m²), and moderate CKD (60 ≥ GFR > 30 mL/min/1.73 m²). Continuous and categorical variables were compared using analysis of variance and the χ² statistic. A multiple logistic regression model was used for detecting the association between total CAC score and GFR. An unadjusted model was used, followed by a second model adjusted for covariates known to be related to CAC. Another multivariable binary logistic model predicting the presence of CAC (>10) was performed and odds of incidence of CAC (>10) were calculated among the three GFR subgroups.ResultsAfter adjustment for covariates, patients with mild CKD had mean CAC scores 175 points higher than those with the referent normal GFR (P = 0.048), while those with moderate CKD had mean CAC scores 693 points higher than the referent (P < 0.001). After adjustment for covariates, patients with mild CKD were found to be 2.2 times more likely (95% confidence interval 1.3-3.7, P = 0.004) and patients with moderate CKD were 6.4 times more likely (95% confidence interval 2.9-14.3, P < 0.001) to have incident CAC compared with the group with normal GFR.ConclusionMild and moderate pre-dialysis CKD are independent risk factors for increased mean and incident CAC