Yong-gwan Jeon

The pulsed laser thin-film deposition process can enable preparation of thin films of complex composition with good control over the film stoichiometry. The film compositions are similar to that of the target pellet and as a consequence this technique appears to be an ideal method for preparing high Tc thin films on a variety of substrates.The factors which contribute to this beneficial phenomenon have been explored by a laser ionization mass spectrometry (LIMS) and a post ablation ionization (P

We report core-level spectroscopic measurements of several cuprate perovskites comparing those which exhibit superconductivity above 90 K to others which do not. Both x-ray photoemission and x-ray absorption results show that in the former Cu is more oxidized, as in CuO (nominally ${\mathrm{Cu}}^{2+}$), than in the latter. Trivalent Cu is clearly excluded. The O $1s$ core level is at higher binding energy in the superconductors, implying the presence of O $2p$ holes. The rare-earth valence in Ce

X-ray-absorption spectroscopy (XAS) is used to explore the systematic variations in the 4d/5d transition-metal {T=Au, Pt, Ir, Re, Pd, Ag} d-orbital occupancy in binary T-X compounds {X=Al, Ga, In, Si, Ge, Sn}. Specifically, the strength of the white line (WL) feature at the T-${\mathit{L}}_{2,3}$ edges is used to quantify the changes in the d-orbital occupancy induced by T-X bond formation. Systematic chemical trends in bonding-induced d-orbital-occupancy changes, evidenced by the data, are disc

We report transition-metal (T) ${L}_{2}$ and ${L}_{3}$ near-edge x-ray-absorption spectroscopy measurements on more than a score of T-X compounds with T=Au, Pt, Ir, and Re and X=Al, Si, and Ge. We correlate the strength of the (2p\ensuremath{\rightarrow}5d)-related ``white line'' feature at these edges to the degree of chemical-bonding-induced 5d-orbital charge transfer in these materials. Similar bonding trends are shown to be present in 1:2:2 compounds involving these T and X elements. Finally

연구배경: 대한민국 성인 비만 증가율은 대학생들이 속해있는 20대에서 가장 높게 나타나고 있는 실정이다. 이런 높은 비만 증가율에도 불구하고 한국 대학생을 대상으로 체질량지수,심폐체력 그리고 근지구력이 대사증후군 위험요인에 미치는영향을 알아본 연구는 매우 제한적이다. 따라서 본 연구의 목적은 한국 대학생들을 대상으로 체력, 체질량지수와 대사증후군 위험요인과의 관계를 알아보는데 있다. 방법: 총 185명(남자: 118명, 여자: 67명)의 대학생들이 본연구에 참여하였으며, 대상자들의 신체구성과 비만도, 체력요인(팔굽혀펴기, 윗몸일으키기, 1600 m 달리기) 그리고 대사증후군 위험요인 다섯 가지(허리둘레, 공복 시 혈당, 중성지방,고밀도 지단백 콜레스테롤, 수축기 혈압, 이완기 혈압)를 측정하였다. 결과: 체질량지수가 높은 그룹은 낮은 그룹보다 허리둘레,중성지방 그리고 수축기 혈압이 유의하게 높게 나타났으며, 체력이 높은 그룹은 낮은 그룹보다 체질량지수, 허리둘레, 공복혈당, 이완기

본 연구의 목적은 과체중 및 비만아동의 체질량지수, 체력과 심혈관 질환 위험요인의 관계를 알아보는데 있다. 80명(나이:11.96±0.85세, BMI:25.54±2.70kg/㎡)의 과체중 및 비만아동이 연구에 참여하였고, 아동의 신체구성과 비만도를 측정하고 체력요인(멀리뛰기, 윗몸일으키기, 좌전굴, 50m달리기, 1000m 달리기), 심혈관질환 위험요인(혈압, 공복시 혈당, 인슐린, HOMA-IR, 총콜레스테롤, 중성지방, 고밀도 지단백 콜레스테롤, AST, ALT, GGT) 및 염증지표(hs-CRP, 아디포넥틴)를 측정하였다. 연구결과 비만아동의 체질량지수가 높은 그룹이 낮은 그룹보다 수축기 혈압, 중성지방, 공복시 인슐린, HOMA-IR, hs-CRP, 심혈관질환 위험 지수가 높게 나타났고 고밀도 지단백 콜레스테롤은 낮게 나타났다(p<.05). 또한 비만아동의 근지구력이 높은 그룹에서 낮은 그룹보다 체질량지수, 체지방률 과 심혈관 질환 위험지수가 낮게 나타났고 아디포넥틴 수치가

We present the results of Cu and Y $K$-edge and rare-earth and Ba $L$-edge x-ray absorption measurements on a series of new quaternary high-${T}_{c}$ superconducting compounds ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cu}{\mathrm{O}}_{4\ensuremath{-}y}$ and $R{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$ ($R=\mathrm{Y},\phantom{\rule{0ex}{0ex}}\mathrm{E}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{a}\mathrm{n}\mathrm{d}\phantom{\rule{0ex}{0ex}}\mathrm{H}\mathrm{o}$). The Cu

Background: Physical activity, especially walking is strongly recommended to control blood glucose among type 2 diabetic patients. Furthermore, physical activity is one of the most important tools to prevent secondary diabetes complications among type 2 diabetic patients such as retinopathy, nephropathy, neuropathy etc. The purpose of the study was to examine the association between the level of walking and physical activity and glucose control among Korean adults with type 2 diabetes.Methods: A

Background: The purpose of the current study was to investigate the association of obesity level, physical fitness level, hemoglobin A1c (HbA1c) level and metabolic syndrome (MetS) risk factors among Korean adults. Methods: A total of 557 adults (272 males and 285 females) who underwent medical check-up at local hospital were recruited. In addition to regular health check-up, cardiopulmonary fitness, muscular endurance were measured and their association were analyzed. Results: The prevalence of

Synchrotron-radiation photoemission results for the 29-K superconductor ${\mathrm{Ba}}_{0.6}$${\mathrm{K}}_{0.4}$${\mathrm{BiO}}_{3}$ are reported for the 14- to 135-eV photon-energy range. Resonant photoemission is used to identify shallow core levels and atomic contributions to the valence band. The results are compared to a recently published band-structure calculation.

Purpose: This study was to identify knowledge, perception and health behavior about metabolic syndrome for an at risk group in a rural community area. Methods: A descriptive cross-sectional survey design was used. A total of 575 adults with hypertension, diabetes mellitus, dyslipidemia, and/or abdominal obesity were recruited from 11 rural community health care centers. A questionnaire was developed for this study. Anthropometric measures were measured and blood data was reviewed from the health

본 연구는 청소년기의 신체적 ･정신적인 건강뿐만 아니라, 비만 예방 및 스트레스 해소에 영향을 줄 수있는 학교스포츠클럽의 참여 실태를 파악하고, 학교스포츠클럽 참여 여부에 따른 청소년의 주관적 건강 인지와 심리적 웰빙의 관계를 파악하는데 목적이 있다. 제 11차 청소년건강행태온라인 조사(2015)에 참여한청소년 68,043명을 대상으로 학교스포츠클럽 참여 여부에 따른 청소년의 주관적 건강과 심리적 웰빙의 관련성을 분석하기 위하여 로지스틱 회귀분석을 실시하여 오즈비(OR; odds ratio)와 95% 신뢰구간(CI; confidence interval)값을 산출하였다. 분석 결과, 청소년의 50.6%(34,430명)가 학교스포츠클럽에 한팀 이상 참여하는 것으로 나타났다. 학교스포츠클럽에 참여하는 학생은 참여하지 않는 학생보다 자신 스스로 건강하다고 느낄 확률이 1.58배(OR=1.58, 95% confidence interval, 95% CI: 1.43-1.69), 행복하다고 느낄

Background: The purpose of the current study was to investigate the association between the level of obesity and physical fitness (PF) during adolescence and the risk factors of metabolic disorders during adulthood. Methods: In the current analysis, 3,993 Korean adults (mean age, 38.70 ± 1.69 years) were recruited. The level of body index (BI) and PF were examined during adolescence through high school record, and their health examination data, including systolic blood pressure (SBP), diastolic