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Recent advances in two‑dimensional inorganic nanosheet‑based supercapacitor electrodes
오승미,Seong‑Ju Hwang 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.2
Exfoliated two-dimensional (2D) nanosheets of inorganic solids exhibit various unique characteristics such as unusually high morphological and structural anisotropy, great diversity in composition and structure, and tunable physicochemical properties. The large 2D surface area and high electrochemical activity of inorganic nanosheets render them as potential materials for supercapacitor electrodes. The electrode performance of these nanosheets can be further improved by their hybridization with highly conductive and/or electrochemically active species. This review focuses on the application of 2D inorganic nanosheets as supercapacitor electrodes and versatile building blocks for synthesizing novel hybrid electrode materials. The crucial roles of 2D inorganic nanosheets in high-performance electrode materials for supercapacitors are discussed and several intriguing examples of 2D inorganic nanosheet-based electrode materials have also been provided. The perspective for future research in this field is discussed along with various strategies to optimize the electrode performance of 2D inorganic nanosheet-based hybrid materials.
오승미,김현리 한국학교보건학회 2010 韓國學校保健學會誌 Vol.23 No.2
Purpose: This research was conducted to compare sex-related knowledge and attitude of 6th-grade elementary school students who participated in the field based learning and those with cooperative learning methods. Methods: The data were collected from June to July in 2009. The subjects of the study were recruited from the classes of the 6th grade conveniently assigned from the D elementary school located in Daejeon metro city. Total of 60 students were assigned either to the field based learning group, and the other 60 students to the cooperative learning group. The field based learning group received sex education at the Daejean Youth Sexuality Culture Center for 3 hours. And the cooperative learning group received sex education by cooperative learning method at the classroom for 40 minutes per session, once a week, for 3 weeks. The sex-related knowledge and attitude scales developed by Lee (2004) were used. The data were analyzed by -test, Fisher's exact test, and t-test using the SPSS/WIN V. 12.0 program. Results: The results were as follows. 1. Sex-related knowledge was not significantly different between the cooperative learning and the field based learning group. 2. Sex-related attitude was not significantly different between the cooperative learning and the field based learning group. Conclusion: In this study, sex-related knowledge and sex-related attitude of the cooperative learning group and the field based learning group were different from the lecture method groups in the earlier study. It is worthy of notice that the cooperative learning group and the field based learning group took relatively less time to improve their knowlede and attitude than the earlier lecture based group did.
전자선 경화를 이용한 모자형 구조 탄소섬유강화복합재료의 제조
오승미,김현빈 한국방사선산업학회 2022 방사선산업학회지 Vol.16 No.2
The difference in electron beam absorption occurred by the bending angle on carbon fiberreinforcedplastic (CFRP) composite was investigated via Monte Carlo simulation and experimentalmethod. The simulation results show that high bending angle results unevenly cured composite becausethe beam penetration depth is limited. The bending effects become weaker as the thickness of thecomposite is getting thinner. The bent material with 5 mm thickness shows ununiformed absorptionfrom 75° bending degree, which is comparable to the result with 10 mm thickness from 85°. For theexperimental validation, the hat-type composite was fabricated using prepreg consisted with carbonfiber and epoxy acrylate resin. The absorbed dose was measured along hat shape using B3 film andalanine pellet. 8 ply and 16 ply stack were prepared and cured. The experimental results also show thatthe absorbed does depend the position on the slope. The composite with thin thickness is more evenlycured compared than the thick one, as expected. The present study suggests that the proper adjustmentof the bending angle and the thickness is required for the electron beam irradiation on the complicatedlystructured composite.
오승미(SeungMi Oh),신선희(SeonHee Shin),이건희(SeonHee Shin) 대한소아신경학회 2006 대한소아신경학회지 Vol.14 No.1
목 적 : 소아 청소년시기에 반복성 두통에는 일차 두통인 편두통, 긴장형두통, 소아 주기성 증후군 등이 있으며, 이차두통의 원인으로는 부비동염이 중요하지만 임상에서 각 질환의 진단은 쉽지않다. 현재 2004년도 국제두통질환 분류의 진단 기준에서는 두통시간, 횟수, 특징 및 동반 증상 등을 기초로 진단하고 있으나 가족력 사항은 제외되어 있다. 그러므로 환아의 임상 양상 및 국제 두통분류에 의한 최종 진단과 환아 가족의 두통 병력을 비교함으로써 진단에 도움이 되고자 한다. 방 법: 한림대학교 의료원 강남성심병원 소아과에 두통을 주소로 내원한 15세 이하 환자 217명을 대상으로 하였다. 환아의 두통은 두통설문지, 두통일기, 방사선 검사 등으로 진단하였고, 모계 및 부계 3대의 두통에 대한 가족력을 조사하였다. 대상환아 두통의 진단은 국제두통질환 분류에 의거하였다. 결 과: 편두통 환아의 경우 어머니에서 73.3%, 외할머니 44.8%, 어머니의 형제 24.8%, 외할아버지 8.6%로 모계 전체에서는 78.1%에서 두통의 병력이 있었다. 그러나 환아의 부계 전체에서 두통 병력의 빈도는 16.2%였다. 긴장형두통으로 진단된 환아의 가족력으로는 어머니 51.4%, 외할머니 18.9%, 어머니의 형제 24.3%로 모계 전체의 56.8%의 두통 병력이 있었다. Mantel-Haenszel 검정법으로어머니의 반복적인 두통 병력이 있을 경우 자식에게 편두통 발생 위험은 긴장형두통보다 2.94배 높았다. 또한 부모에서 반복적 두통 병력이 있는 경우는 자식에게 편두통 발생 위험은 긴장형두통보다 3.22배 높았으며, 어머니와 외할머니가 반복적인 두통 병력이 있을 때에는 3.75배로 높았다. 결 론: 소아 두통의 진단에 있어 소아두통의 발생빈도와 특징 및 동반증상을 자세히 이해하는 것이 중요하며 두통의 가족력이 있을 경우는 긴장형 두통보다는 일차적으로 소아 편두통을 고려해야 한다. 본 연구를 통해 반복성 소아 두통의 진단에 가족력이 중요함을 확인할 수 있으며 특히 편두통의 진단 기준에 가족력 항목을 참조함으로써 진단에 도움이 될 수 있기를 기대할 수 있다. Purpose : Headache is a common problem in children and adolescents, and they experience severe pain and disabilities from headache. But there had not been an appropriate system for the diagnosis and the classification for headache in children and adolescents before the international classification of headache disorders(ICHD-II) was developed. But family history was not included in this classification's criteria. So we evaluated the effects of family history on the diagnosis of children with recurrent headaches. Methods : 217 patients with recurrent headaches younger than fifteen years old were selected. To diagnose the patients' headache, we utilized headache questionnaires, headache diaries, and studied the family history of headache on the patients' maternal and paternal lines. Final diagnosis was based on the ICHD-II. Results : In the migrainous patients, 78.1% had positive family history of headache on the maternal lines, and 16.2% on the paternal lines. In the patients with tension-type headache, 56.8% had positive family history of headache on the maternal lines. When the mother of a patient suffered from recurrent headaches, migraine occurred 2.94 times as frequently as tension-type headache(Mantel-Haenszel odds ratio, 2.94; P<0.01; 95% confidence interval, 1.36-6.38). And if a patient had parents with recurrent headaches, migraine occurred 3.22 times as frequently as tension-type headache(odds ratio, 3.22; P<0.005; 95% confidence interval, 1.48-7.02). Conclusion : We can consider migraine rather than tension-type headache when a patient has family history of recurrent headaches. In our study, we were able to validate that positive family history of headache was important in diagnosing the headache of children.