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한국 성인의 소득수준에 따른 치아우식, 깊은 치주낭, 다수 치아 상실의 불평등 추이: 국민건강영양조사 자료를 이용한 구강건강 불평등 추이 분석(2)
정세환 대한예방치과·구강보건학회 2022 大韓口腔保健學會誌 Vol.46 No.2
Objectives: The purpose of this study is to analyze the trend of inequality in dental caries, deep periodontal pockets, and severe tooth loss according to the income level of adults using data from the Korea National Health and Nutrition Examination Survey (KNHANES). Methods: The raw data from the 4th wave (2007-2009) to the 7th wave (2016-2018) were downloaded from the KNHANES website. The analytical subjects were 19 years of age or older who completed oral examinations and were classified differently according to the prevalence characteristics of each clinical indicator. The prevalence of permanent tooth caries (19 years +), deep periodontal pockets (30 years +), total tooth loss (50 years +), and 20 teeth and over (70 years +) were estimated according to the guidebook for data users. The absolute difference (AD) between thelowest and highest income levels and the prevalence ratio (PR) were calculated. All statistical analyses were performed with STATA version 13. Results: The prevalence of permanent tooth caries decreased by 6.7%, but the AD increased by 3.4% and the PR was statistically significant. The prevalence of deep periodontal pockets was 6-10%, but the AD increased by 1.7%, and the PR of 7th wave rapidly increased. The prevalence of total tooth loss decreased by 1.5%, but in the 7th wave, the AD and the PR rapidly increased. The prevalence of 20 teeth and over increased by 10.9%, but the AD increased by ―4.3%, and the PR was statistically significant in the first and second quantiles of all waves. Conclusions: In Korean adults, overall oral health status has improved over the past decade, but oral health inequality according to income level has generally worsened. Therefore, policy development including intervention in social determinants is needed to reduce the oral health inequality identified in this study.
Reverse Bending을 통한 CTOD 시험 예비균열 형상균일화에 관한 연구
정세환,박동환,김현수,신상범,박태종,Jeong, Sehwan,Park, Dong-Hwan,Kim, Hyeon-Su,Shin, Sang-Beom,Park, Tae-Jong 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
This study investigates the appropriate range of reverse bending load for the CTOD test of thick weld by observing improvement of pre-crack shape and determination of the limit applicable load. In order to do it, the effect of the amount of the reverse bending load on the maximum deviation of the pre-crack length was investigated by the extensive tests, and the variation of plastic zone size in way of the crack tip under reverse bending load were evaluated by FEA. With the results obtained by the experiments and FEA, the proper range of reverse bending load was suggested. The effectiveness of the reverse bending method was verified by examining the pre-crack straightness after CTOD tests of thick weld specimens with various thickness and strength.
朝鮮語學習書 韓語通 の言語學的一考察 -動詞についての記述を中心に-
정세환 한국일본근대학회 2010 일본근대학연구 Vol.0 No.27
本硏究は日本人向けの朝鮮語學習書である前間恭作著『韓語通』のうち、特に動詞に關する記述について言語學的觀点から考察することを目的としたものである。『韓語通』では動詞の內部構造を「語根+語尾」とし、全體的に動詞の活用、特に語尾の變化を中心として論じている。論述にあたっては、朝鮮語動詞の意味·用法を日本語學の槪念を用いて說明しているところが目立つ。文法事項に關する定義などが省略されている場合が多く、基本的に日本語學に關する知識を持っている人を對象としていると考えられ、文型や例を示す場合にも、日本語の表現を中心としてそれに對應させる形で朝鮮語の文型や例を示している。また、當時のことばだけではなく古語にも言及しているが、古語そのものの意味·用法のみならず、古語と當時の朝鮮語との間の對照關係や、古語の影響を受けた方言にも言及している上、話し言葉としての口語にも言及している。日本語學を土台にしつつも、朝鮮語動詞の特徵を體系的にまとめようとした試みは評價されるべきであろう。