Kyungchul Song
Biographic Data
| ID | 5869197 |
|---|---|
| NAME | Kyungchul Song |
| GIVEN NAMES | Kyungchul |
| FAMILY NAME | Song |
| SIGNATURE | SONG K |
| AFFILIATIONS | Yonsei University |
| ORCID | 0000-0002-8497-5934 |
| VERIFIED | Yes |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 0 |
| WORKS AS AUTHOR | 11 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2012 |
| LATEST PUBLICATION YEAR | 2023 |
| H-INDEX | 0 |
Change in Prevalence of Hypertension among Korean Children and Adolescents during the Coronavirus Disease 2019 (Covid-19) Outbreak
During the coronavirus disease 2019 (COVID-19) outbreak, the prevalence of obesity increased globally; this may be associated with hypertension incidence. However, investigations on the changes in the prevalence of hypertension among children and adolescents are limited. This cross-sectional study investigated the prevalence of hypertension among 1428 youths aged 10-18 years using data from the Korea National Health and Nutrition Examination Surv…
Association of maternal mental health and drinking/smoking with adolescents’ mental health based on the Korea National Health and Nutrition Examination Survey
We conclude that close monitoring of mental health is required for adolescents with drinking and smoking habits and mothers with mental health problems
Height and subjective body image are associated with suicide ideation among Korean adolescents
Low height and perceived obesity, not real obesity, are associated with suicide ideation among Korean adolescents. These findings indicate that the need for an integrated approach to growth, body image, and suicide in adolescents is warranted
Multiple Testing and the Distributional Effects of Accountability Incentives in Education
This article proposes bootstrap-based multiple testing procedures for quantile treatment effect (QTE) heterogeneity under the assumption of selection on observables, and shows its asymptotic validity. Our procedure can be used to detect the quantiles and subgroups exhibiting treatment effect heterogeneity. We apply the multiple testing procedures to data from a large-scale Pakistani school report card experiment, and uncover evidence of policy-re…
Counterfactual analysis under partial identification using locally robust refinement
Structural models that admit multiple reduced forms, such as game‐theoretic models with multiple equilibria, pose challenges in practice, especially when parameters are set identified and the identified set is large. In such cases, researchers often choose to focus on a particular subset of equilibria for counterfactual analysis, but this choice can be hard to justify. This paper shows that some parameter values can be more “desirable” than other…
Management of Central Precocious Puberty in Children with Hypothalamic Hamartoma
Hypothalamic hamartoma (HH) is a rare, congenital, and benign lesion of the tuber cinereum, typically presenting with central precocious puberty (CPP), gelastic seizure, and developmental delay. This study aimed to investigate CPP in HH patients and compare clinical features between before and after gonadotropin-releasing hormone (GnRH) agonist treatment. A total of 30 HH patients under 18 years of age who visited Severance Children's Hospital be…
Association of Vitamin D Status and Physical Activity with Lipid Profile in Korean Children and Adolescents
Dyslipidemia is one of the important influencing factors of cardiovascular health in the youth, and thus, assessment of its etiology is important. We aimed to investigate the association of dyslipidemia with vitamin D and physical activity in Korean children and adolescents. Data of 3183 subjects aged 12-18 years in the Korea National Health and Nutrition Examination Survey were analyzed. Participants were divided into subgroups according to sex,…
Sex Hormone-Binding Globulin Is Associated with Obesity and Dyslipidemia in Prepubertal Children
Sex hormone-binding globulin (SHBG) is associated with age, sex, and puberty. The association of SHBG with various diseases has been suggested nowadays, however, the relationships in prepubertal children have not been sufficiently investigated. This study analyzed the relationship of SHBG with body mass index (BMI) and plasma lipid levels in prepubertal children. We evaluated the association of SHBG with BMI among the 693 prepubertal children sub…
The Role of Quality in Internet Service Markets
In online procurement markets, projects are often allocated through a mechanism that allows buyers to take into account a seller's nonprice characteristics as well as his bid. We design a methodology to recover primitives of the environment in the presence of unobserved seller heterogeneity while accommodating two important features of such markets: buyer-specific choice sets and the high turnover of sellers. We apply our method to data from an o…
Measuring the Graph Concordance of Locally Dependent Observations
This paper introduces a simple measure of a concordance pattern among observed outcomes along a network, that is, the pattern in which adjacent outcomes tend to be more strongly correlated than nonadjacent outcomes. The graph concordance measure can be generally used to quantify the empirical relevance of a network in explaining cross-sectional dependence of the outcomes, and as shown in the paper, it can also be used to quantify the extent of ho…
Testing Predictive Ability and Power Robustification
One of the approaches to compare forecasting methods is to test whether the risk from a benchmark prediction is smaller than the others. The test can be embedded into a general problem of testing inequality constraints using a one-sided sup functional. Hansen showed that such tests suffer from asymptotic bias. This article generalizes this observation, and proposes a hybrid method to robustify the power properties by coupling a one-sided sup test…
No prominent works on this page.
Testing Predictive Ability and Power Robustification
One of the approaches to compare forecasting methods is to test whether the risk from a benchmark prediction is smaller than the others. The test can be embedded into a general problem of testing inequality constraints using a one-sided sup functional. Hansen showed that such tests suffer from asymptotic bias. This article generalizes this observation, and proposes a hybrid method to robustify the power properties by coupling a one-sided sup test…
Measuring the Graph Concordance of Locally Dependent Observations
This paper introduces a simple measure of a concordance pattern among observed outcomes along a network, that is, the pattern in which adjacent outcomes tend to be more strongly correlated than nonadjacent outcomes. The graph concordance measure can be generally used to quantify the empirical relevance of a network in explaining cross-sectional dependence of the outcomes, and as shown in the paper, it can also be used to quantify the extent of ho…
The Role of Quality in Internet Service Markets
In online procurement markets, projects are often allocated through a mechanism that allows buyers to take into account a seller's nonprice characteristics as well as his bid. We design a methodology to recover primitives of the environment in the presence of unobserved seller heterogeneity while accommodating two important features of such markets: buyer-specific choice sets and the high turnover of sellers. We apply our method to data from an o…
Association of Vitamin D Status and Physical Activity with Lipid Profile in Korean Children and Adolescents
Dyslipidemia is one of the important influencing factors of cardiovascular health in the youth, and thus, assessment of its etiology is important. We aimed to investigate the association of dyslipidemia with vitamin D and physical activity in Korean children and adolescents. Data of 3183 subjects aged 12-18 years in the Korea National Health and Nutrition Examination Survey were analyzed. Participants were divided into subgroups according to sex,…
Sex Hormone-Binding Globulin Is Associated with Obesity and Dyslipidemia in Prepubertal Children
Sex hormone-binding globulin (SHBG) is associated with age, sex, and puberty. The association of SHBG with various diseases has been suggested nowadays, however, the relationships in prepubertal children have not been sufficiently investigated. This study analyzed the relationship of SHBG with body mass index (BMI) and plasma lipid levels in prepubertal children. We evaluated the association of SHBG with BMI among the 693 prepubertal children sub…
Counterfactual analysis under partial identification using locally robust refinement
Structural models that admit multiple reduced forms, such as game‐theoretic models with multiple equilibria, pose challenges in practice, especially when parameters are set identified and the identified set is large. In such cases, researchers often choose to focus on a particular subset of equilibria for counterfactual analysis, but this choice can be hard to justify. This paper shows that some parameter values can be more “desirable” than other…
Management of Central Precocious Puberty in Children with Hypothalamic Hamartoma
Hypothalamic hamartoma (HH) is a rare, congenital, and benign lesion of the tuber cinereum, typically presenting with central precocious puberty (CPP), gelastic seizure, and developmental delay. This study aimed to investigate CPP in HH patients and compare clinical features between before and after gonadotropin-releasing hormone (GnRH) agonist treatment. A total of 30 HH patients under 18 years of age who visited Severance Children's Hospital be…
Multiple Testing and the Distributional Effects of Accountability Incentives in Education
This article proposes bootstrap-based multiple testing procedures for quantile treatment effect (QTE) heterogeneity under the assumption of selection on observables, and shows its asymptotic validity. Our procedure can be used to detect the quantiles and subgroups exhibiting treatment effect heterogeneity. We apply the multiple testing procedures to data from a large-scale Pakistani school report card experiment, and uncover evidence of policy-re…
Change in Prevalence of Hypertension among Korean Children and Adolescents during the Coronavirus Disease 2019 (Covid-19) Outbreak
During the coronavirus disease 2019 (COVID-19) outbreak, the prevalence of obesity increased globally; this may be associated with hypertension incidence. However, investigations on the changes in the prevalence of hypertension among children and adolescents are limited. This cross-sectional study investigated the prevalence of hypertension among 1428 youths aged 10-18 years using data from the Korea National Health and Nutrition Examination Surv…
Association of maternal mental health and drinking/smoking with adolescents’ mental health based on the Korea National Health and Nutrition Examination Survey
We conclude that close monitoring of mental health is required for adolescents with drinking and smoking habits and mothers with mental health problems
Height and subjective body image are associated with suicide ideation among Korean adolescents
Low height and perceived obesity, not real obesity, are associated with suicide ideation among Korean adolescents. These findings indicate that the need for an integrated approach to growth, body image, and suicide in adolescents is warranted
Medicine (7 works) · Computer Science (5 works) · Internal Medicine (5 works) · Body mass index (4 works) · Econometrics (4 works) · Obesity (4 works) · Economics (3 works) · Environmental health (3 works) · Mathematics (3 works) · Population (3 works)