FDTD Modeling for the Accurate Electromagnetic Wave Analysis of Graphene

Yeon‑Hwa Kim,Hongjin Choi,Jeahoon Cho,Kyung‑Young Jung 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

We develop a fnite-diference time-domain (FDTD) method suitable for the electromagnetic (EM) analysis of graphene. In this work, we employ the modifed Lorentz model for dispersion modeling, the two-dimensional (2-D) sheet model for geometrical modeling, and the complex-frequency-shifted (CFS)-perfectly matched layer (PML) for the absorbing boundary condition. In specifc, the accurate complex-conjugate pole-residue (CCPR) dispersion model is frst adapted for the electrical modeling of graphene by using the robust vector ftting. Next, the CCPR parameters are converted to the modifed Lorentz parameters and then the modifed Lorentz-based dispersive FDTD formulation is used to enhance the computational efciency. In FDTD cell modeling, the 2-D sheet cells are allocated for graphene rather than the conventional FDTD cell-based modeling. Finally, CFS-PML are employed for terminating the computational domain to avoid the late-time instability. The presented FDTD approach is validated in numerical examples for graphene-based parallel plate waveguides.

비만을 동반한 위암 환자에서 두 병을 같이 수술 치료한 경험(증례)

최경현,윤기영,문형환,신연명,서경원,안수미,송윤미,석정희,정경연,이은하 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.3

Obesity is growing problem in Korea. We had a case of bariatric surgery during gastric cancer operation. Patient was 29 year old Korean lady with early gastric cancer located in the lesser curvature side of the middle 1/3 of the stomach. Her body weight was 89 kg, height 163 cm, and thus body mass index was 33.5 kg/m2. Preoperative blood pressure was 130/90 mmHg, hemoglobin 12.9 g/dL, total lymphocyte count 3,280/mL, serum albumin 4.3 g/dL, CEA 1.1 ng/mL, CA 19-9 9.1 ng/mL, and alpha fetoprotein 2 ng/mL. Another associated disease was right thyroid follicular neoplasm. The chest X-ray was normal. After IM injection of 2,500 units of heparin 30 minutes before the induction of general anesthesia, she received curative subtotal gastrectomy and Roux en Y gastrojejunostomy when a malabsorption loop of 120 cm jejunum was incorporated between the Treitz ligament and the end to side jejuno-jejunostmy site at May 29th 2006. Her postoperative course was uneventful except a minor wound seroma and the elevations of serum amylase(up to 4 folds) and lipase(up to 2 folds). She lost her body weight 9 kg in 5th, 21 kg in 7th, and 27 kg in 10th postoperative months to became 61.5 kg. On follow up exams in July 2008, she gained 4 kg to overcome her weakness and fatigue. From the above result, the incorporation of a malabsorption loop during reconstruction phase of gastric cancer operation was a good option for obese gastric cancer patients especially in cases of early gastric cancer.

문학,문화 : 디지털 시대 도시의 생태학적 전망

이경래 ( Kyung Lae Lee ),박규현 ( Kyou Hyun Park ),조연정 ( Yeon Jung Cho ) 경희대학교 비교문화연구소 2012 비교문화연구 Vol.26 No.-

City`s Ecological Landscape in the Digital Age Lee Kyung-Lae, Park Kyou-Hyun, Cho Yeon-Jung We all know how beautiful our wild and it`s importance to our living planet Earth. But did you realise the speed at which man himself is damaging it`s unique natural habitat. We are well on our way to destroy our forests, plants, wetlands. We are polluting our oceans and seas. This way, we`re driving numerous animal species, plant species and many others into extinction. Everyone should be aware of the importance of our natural environment. We live in the period of echocide. Why we need nature to survive and how we can deal with the environmental problems we face. This paper has the purpose to reform city`s environment. Because, Metropolis and megalopolis are the principal cause of environmental disruption. To reform the city is needed to consider digital technology in our age. In the face of economic and cultural globalization, many have argued that we live an increasingly placeless world. However, as a growing number of cities participate and compete in key marketplaces of advanced capitalism, the spectacle of the city is more than ever a significant medium of communication in its own right. In doing so, this work is focused specifically on the dimension of city`s media environment. To that end, the paper examined U-City and U-Eco city. In this study, we will introduce the study on model of U-Eco City as one way for the eco-freindly future city.

노년여성의 귀환과 탈가부장제의 징후들

김경연 ( Kim Kyung-yeon ) 민족어문학회 2018 어문논집 Vol.- No.82

이 글은 청년을 인간의 표준으로 결정하고 미개인, 광인, 여성과 더불어 노인을 비인간으로 축출한 근대 휴머니즘의 폭력적 메커니즘에 주목하면서, 젠더적 관점에서 노년을 재독하고자 했다. 젠더·인종·계층/계급에 따라 노년을 살아가는 경험은 다르며, 때문에 이러한 차이를 간과한 노년 연구란 부분적이며 추상적일 수밖에 없다. 노년을 젠더의 관점에서 읽어야 하는 이유도 여기에 있다. 가부장적 자본주의 체제를 살아온/가는 노년여성들의 삶이 남성노년들과 같을 수 없으며, 중산층 여성노인과 가난한 박카스 할머니의 현실이, 혹은 칠십의 나이에 일본군 위안부였다는 사실을 증언한 김학순이나 밀양 송전탑 투쟁의 최전선에 서는 여든 일곱 김말해의 노년이 침묵하는 노년여성들의 삶과 같을 수는 없다. 이 같은 복수의 노년여성들의 실존을 상기하면서 본고는 노년의 여성들을 재현하는 여성서사에 주목했다. 남성중심적인 문학의 주변부에서 거대/주류 서사가 누락하거나 은폐한 여성/타자들의 삶을 미시적으로 천착한/하고자한 것이 여성문학이라면, 노년여성의 억압, 침묵, 분투를 가시화한 여성서사를 통해 가부장적 자본주의 체제를 이반하는 노년여성의 재현 가능성을 탐사해 보는 일은 유의미할 것이다. 이를 위해 먼저 노년여성들의 삶을 기록/재현한 서사물의 계보들, 특히 청년의 시대였던 근대의 여성문학 속에서 여성노인들이 재현되는 양상에 주목하였다 전통적인 가부장제와 대결하면서. 새로운 집의 발명을 열망했던 근대 청년여자들의 서사는 근대가 배제하거나 누락한 노년여성의 삶을 가시화하는 한편, 전근대 가부장들이 상상한 ‘헌신적인 어머니’와 근대 청년들이 매도한 ‘혐오스러운 노파’와는 변별되는 이질적인 어머니/할머니들을 조형했다. 그러나 이 차별화된 재현에도 불구하고, 문학을 통한 근대적 가치의 전파가 신여성 작가들의 욕망이자 사명인 이상 노년여성들의 삶을 부조한 경우는 드물었으며, 더구나 어머니/할머니라는 젠더 역할을 국한되지 않는 개별적 욕구를 지닌 인간으로서 노년여성의 삶을 천착한 경우는 거의 부재했다. 그렇다면 근대의 황혼이 도래하고 전지구적 노후의 시간을 살고 있는 지금 이곳의 여성작가들은 다시 노년과 젠더의 문제를 어떻게 사유하고 있을까. 이 글은 근대 청년여자의 서사에 이어 신경숙, 김숨, 권여선 등 87년 이후 집의 혁명을 추동하고 자본주의 가부장제의전복을 열망했던 이른바386세대 계보의 여성작가들의 소설 속에서 노년여성의 삶이 재현되는 양상을 살폈다. 그들이 다시 쓰는 늙은 여자들의 이야기 속에서 가부장제가 발명한 숭고한 어머니/할머니는 더 이상 매끄럽게 관철되지 않는다. 어머니/할머니가 아닌 단지 ‘이모’로 늙어가는 「이모」 (권여선)의 ‘윤경호’는 물론이고, 어머니/할머니라는 젠더호명에 복종하며 살아왔던 『엄마를 부탁해』 (신경숙)의 ‘박소녀『’나 여인들과 진화하는 적들』 (김숨)의 ‘정순자’ 역시 더 이상 “길들여진 좌절의 협조자”로 남지 않는다. 실종을 빌어 가부장의 집으로부터 탈주하고(박소녀), 자기를 멸함으로써 모성으로부터 해방되고자 하며(정순자), 가족/세상과 절연하고 고유한 ‘나’로 말년을 살아가는(윤경호) 그들은 세상과 화해하기보다 불화하며 가부장제가 가공한 사랑과 행복의 집에 은폐되었던 폭력과 슬픔을 적발하는 불길하고 불온한 모성/여성이 된다. 집/친밀성의 오랜 수호자였던 이들 늙어가는 여자들을 통해서 아이러니하게도 친밀성의 판타지는 내파되는 것이다. This paper aimed to reperuse the elderly life from gender perspective, while paying attention to the violent mechanism of modern humanism that defined youth as the human standard and inhumanely ousted the elderly in the same way as barbarians, madmen and women. The experience of the elderly life varies among different genders, ethnicities and social classes. For this reason, studies on the elderly life that overlook such differences are partial and abstract. This is the very reason why the elderly life must be interpreted from gender perspective. Lives of elderly women who lived or are living in patriarchal capitalism cannot be identical to lives of elderly men. The reality of an elderly middle class woman cannot be the same as the reality faced by a poor elderly prostitute. Recalling the existence of such diverse lives of elderly women, this paper focused on the female narratives reproducing elderly women. If women’s literature attempted to inquire microscopic lives of women or the others either omitted or concealed by the major or mainstream narratives in the peripherals of the male-centered literary world, it would be a meaningful effort to explore the reproducibility of elderly women deserting from the patriarchal capitalism through the female narratives that visualize the oppression, silence and struggle of elderly women. As a part of such effort, the author of this study examined the genealogy of narrative works that recorded or reproduced lives of elderly women, especially the ways in which elderly women were reproduced in modern women’s literature from the era of youth. Narratives of young modern women who longed for new finding of home and confronted the traditional patriarchy visualized lives of elderly women either excluded or omitted by the modern world, while on the other hand shaping new mothers and grandmothers who are differentiated from ‘devoted mothers’ imagined by the pre-modern patriarchs and ‘hateful old women’ denounced by modern youths. Despite such differentiated reproduction, it was rare to find works that depicted lives of elderly women because the desire and mission of modern female authors were to spread modern values through literature. Furthermore, there was almost complete absence of works that viewed lives of elderly women as human beings with their own needs instead of constraining them to the gender role of a mother or grandmother. As the entire world is welcoming the dusk of the modern era with global aging, how are female authors of the contemporary world dealing with the elderly and gender issues? This paper examined the ways in which lives of elderly women were reproduced in novels written by female authors of the so-called 386 generation who drove household revolution and wished for overturn of the patriarchal capitalism since 1987, such as Kyung-sook Shin, Soom Kim and Yeo-sun Kwon. In the midst of their stories about old women, the noble mothers and grandmothers invented by patriarchy are no longer found to be a matter of course. ‘Gyeong-ho Yoon’ in “Aunt” (Yeo-sun Kwon) simply grows old as an aunt instead of a mother or grandmother. ‘So-nyeo Park’ in “Please Look After Mon” (Kyung-sook Shin) yields to the gender-bound nicknames like mother and grandmother. ‘Soon-ja Jeong’ in “Women and Their Evolving Enemies” (Soom Kim) no longer remains to be a tamed helper of frustration. She runs away from patriarchal home as if she has gone missing (So-nyeo Park), she tries to be freed from maternity by destroying her existence (Soon-ja Jeong) and she lives an independent elderly life isolated from her family and the world (Gyeong-ho Yoon). These figures become unfortunate and rebellious mothers or women who confront the world instead of reconciling with it, revealing the violence and sorrow concealed underneath fake love and happiness created by patriarchy. The fantasy of intimacy is ironically imploded by these aging women, who have long been the guardians of their home and intimacy.

초등학생의 발달단계에 따른 창의적 능력과 창의적 성격 및 영역 창의성 분석

이경화(Lee Kyung hwa),최병연(Choi Byung yeon) 한국영재교육학회 2006 영재와 영재교육 Vol.5 No.2

본 연구는 우리나라 초등학생의 창의성, 즉 창의적 능력과 창의적 성격의 관계 및 발달단계에 따른 차이를 분석함으로써 초등학생들의 창의성의 발달적 특성을 이해하여 창의성 계발을 위한 교육에 시사점을 제공하고자 하는데 목적이 있다. 이를 위하여 개별창의성검사를 사용하여, 1학년부터 6학년까지 초등학생 825명의 창의성을 측정하고 그 결과를 분석하였다. 그 결과 독창성을 제외하고 모든 창의성의 요인들이 학년과 상관관계가 있음을 알 수 있었다. 창의적 능력은 하위 요인 중 독창성과 가장 높은 상관이 있는 것으로 나타났으며, 창의적 성격은 하위 요인 중 민감성과 높은 상관이 있는 것으로 나타났다. 창의적 능력과 창의적 성격을 학년에 따라 분석한 결과, 초등학생들의 창의성 발달은 비연속적인 특성을 나타낸다는 것이 확인되었다. 반면에 초등학생들의 창의적 성격은 학년이 증가함에 따라 점점 더 발달해 가는 것으로 나타났다. 한편 영역 창의성의 발달 단계별 차이를 확인한 결과, 언어와 조작 창의성은 학년의 증가에 따라 높은 반면에, 도형 창의성은 3학년 까지 상승하다가 4학년 때 하강하여 다시 상승하는 것으로 나타났다. This study analyzes the developmental characteristics for creative ability, creative personality and domain creativity of Korean elementary school children. The Korean Individual Creativity Test (KICT), developed by Kyung-Hwa Lee, was used to measure creativity. KICT consists of three domains, three creative abilities and three types of creative personalities. The three domains involve language, drawing, and manual operation. The three creative abilities involve fluency, flexibility and originality. The three personality types involve curiosity, sensitivity, and task commitment Approximately 825 participants were selected in the 18 regions of Korea according to the ratio of schools. The results of this study was that creative abilities had high correlation with originality factor and creative personalities had high correlation with sensitivity factor. Also, primary school children"s creative abilities peaked at grade 3 and fell down sharply at grade 4. Whereas, children"s creative personalities developed as the children"s grade increased. Finally, language and manual operation increased with children"s grade, but drawing operation showed same trend as that of creative abilities. These results imply that, when we assess the creativity development of primary school children, we would do well to analyze their developmental creativity characteristics in terms of the implications for the future development of creative teaching and learning programs.

전산화 단층촬영과 생체 전기저항 분석법으로 측정한 내장지방과 비만관련 지표의 연관성

임제연 ( Je Yeon Lim ),송윤경 ( Yun Kyung Song ),임형호 ( Hyung Ho Lim ) 한방재활의학과학회 2011 한방재활의학과학회지 Vol.21 No.4

Objectives: In this study, we used both visceral fat area(VFA)/subcutaneous fat area(SFA) ratio(V/S ratio) and bioelectrical impedence analysis(BIA) for a comparative study between VFA measured from several abdominal computed tomography(CT) images and obesity indexes, such as body mass index(BMI), waist circumference(WC), and waist-hip ratio(WHR). Methods: A group of 63 test subjects were gathered in the oriental medical hospital of Kyung-Won university. BIA for body composition and body size for obesity indexes were estimated to evaluate the obesity indexes. Pearson correlation coefficients and regression analysis were used to select useful obesity index. Results: The VFA-CT was significantly related to BMI, SFA, WC, hip circumference(HC), body fat mass(BFM), basal metabolic rate(BMR), and VFA-BIA. Especially, we found that the VFA-BIA and BMI were significantly correlated to VFA-CT. Conclusions: VFA-BIA index is an optimized index for diagnosis and evaluation of obesity. Finally, we found that the BMI is optimized to represent VFA.

국내외 ‘영아’ 관련 연구물의 최근 동향 분석 : 2000년~2013년 발간 논문을 대상으로

이승연,권수현,권연정,김언경,나영이,유주연,최정아 이화여자대학교 교육과학연구소 2015 교육과학연구 Vol.46 No.3

The purpose of this study was to examine research trends in infant research published from 2000 to 2013, in order to understand overall aspects in research topics, methods, and subjects in infant research and to suggest directions for future infant research. A total of 2916 journal articles and theses/dissertations, both domestic and foreign, were selected for the analysis. The findings of this study were as follows: First, for the 14 year period, 737 domestic articles, 634 domestic theses/ dissertations, 1242 foreign articles, and 303 foreign dissertations on infant research were published, and there was a steady increase in the number of articles and theses/dissertations over the years. Second, in terms of research topics, different patterns were found between the domestic ones and the foreign ones; the topic of “education and teachers” in the domestic ones and “development” in the foreign ones occurred most frequently. Third, in terms of research methods, the domestic ones employed “survey” the most, and the foreign ones employed “experiment” the most among quantitative research methods; when analyzing the relation between methods and topics, the foreign ones showed clear matches between topics and research methods, while the domestic ones preferred “survey” regardless of the topics. Fourth, in terms of subjects/participants, “infants” were the most researched in both the domestic ones and the foreign ones, followed by “parent” and “teachers.” Among the infants, the domestic ones focused on 25~36-month olds the most, while the foreign ones focused most on 0~12-month olds. In addition, in all types of infant research, there were more single subject studies than multiple subject ones.

초등학생의 학교건강검사 결과와 만족도

박경민(Park, Kyung Min),배연숙(Bae, Yeon Suk) 계명대학교 간호과학연구소 2010 계명간호과학 Vol.14 No.1

Purpose: The purpose of this descriptive study was conducted to investigate the health condition and satisfaction for health examination of students in elementary school. Method: The subjects for this study were 113 students, from an elementary school in W, Kyung-Buk Province. The health condition and satisfaction Questionnaire made by Kyung-Buk Education Office(2007) and modified by authors of this study were used to measure health condition and satisfaction. The data were collected from Dec. 21 to Dec. 13, 2009 using questionnaire with self reported and records of the school health. Data was analysed by x 2-test, independent t-test and ANOVA with SPSS WIN 17.0. Result: There were no statistically significant differences in the reported satisfaction scores of elementary school children regarding health examinations either by gender (male: 40.13 ± 3.90, female: 39.95 ± 4.50)or economic conditions (low: 41.00 ± 2.3, upper: 40.53 ± 4.9, middle: 39.66 ± 4.1). Conclusion: The findings in this study did not support differences in satisfaction scores either by gender or level of income relative to health examination. Future research may utilize a qualitative approach to explore differences among school.

The Influence of AH-26 and Zinc Oxide-Eugenol Root Canal Sealer on the Shear Bond Strength of Composite Resin to Dentin

Cho, Ju-Yeon,Jin, Myoung-Uk,Kim, Young-Kyung,Kim, Sung Kyo 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.3

AH-26 근관실러가 상아질에 대한 복합레진의 전단결합강도에 미치는 영향을 평가하기 위하여 144개의 발거된 대구치를 실린더형의 몰드에 매식한 다음 치관부의 상아질 표면을 노출시킨 후 편평하게 연마하고 AH-26을 도포한 군, ZOE paste를 도포한 군 및 실러를 도포하지 않은 대조군으로 나누어 One-step 상아질 접착제를 처리한 후에 Charisma (Heraeus Kulzer, Germany) 복합레진을 적용하고 광중합시켰다. 시편을 분리하여 37℃ 항온조에 24시간 보관후 Instron test machine (Model 4202, Instron Corp., USA)을 이용하여 시편의 전단 결합 강도를 측정하고 one-way ANOVA 및 Tukey's studentized rank test로 통계 분석하였다. AH-26 근관실러로 처리한 군과 대조군은 ZOE 근관실러 처리군에 비해 유의하게 놓은 접착강도를 나타내었다 (p<0.05). AH-26 근관실러 처리군과 아무 처리하지 않은 대조군 사이에는 결합강도에 있어 유의한 차이를 나타내지 않았다 (p>0.05). 본 연구의 조건에서는 ZOE 근관실러는 상아질에 대한 복합레진의 전단결합강도를 저하시키는 반면 AH-26 근관실러는 유의한 영향을 미치지는 않는 것으로 보인다. 따라서 임상에서 근관실러로 AH-26을 사용한 근관충전 후에는 즉시 복합레진 코어를 해 주어도 결합력에 저해가 없을 것으로 여겨진다. The purpose of this study was to evaluate the influence of the AH-26 root canal sealer on the shear bond strength of composite resin to dentin. One hundred and forty four (144) extracted, sound human molars were used. After embedding in a cylindrical mold, the occlusal part of the anatomical crown was cut away and trimmed in order to create a flat dentin surface. The teeth were randomly divided into three groups; the AH-26 sealer was applied to the AH-26 group, and zinc-oxide eugenol (ZOE) paste was applied to the ZOE group. The dentin surface of the control group did not receive any sealer. A mount jig was placed against the surface of the teeth and the One-step dentin bonding agent was applied after acid etching. Charisma composite resin was packed into the mold and light cured. After polymerization, the alignment tube and mold were removed and the specimens were placed in distilled water at 37℃ for twenty four hours. The shear bond strength was measured by an Instron testing machine. The data for each group were subjected to one-way ANOVA and Tukey's studentized rank test so as to make comparisons between the groups. The AH-26 group and the control group showed significantly higher shear bond strength than the ZOE group (p<0.05). There were no significant differences between the AH-26 group and the control one (p>0.05). Under the conditions of this study, the AH-26 root canal sealer did not seem to affect the shear bond strength of the composite resin to dentin while the ZOE sealer did. Therefore, there may be no decrease in bond strength when the composite resin core is built up immediately after a canal filling with AH-26 as a root canal sealer.

초등학생의 창의성 발달 경향 분석

이경화(Lee, Kyung hwa),최병연(Choi, Byung yeon) 한국영재교육학회 2012 영재와 영재교육 Vol.11 No.2

본 연구의 목적은 우리나라 초등학생의 창의성 발달 경향을 분석하는데 있다. 창의성에 대한 기존 연구를 종합하여 창의성을 창의적 능력과 창의적 성격 영역으로 구분하고, 각 영역의 하위 요인들을 분석하고자 하였다. 이를 위하여 전국 시도별로 편의 표집을 통해 초등학생(1-6년) 2,248명의 창의성을 측정하고 학년별 차이를 분석하였다. 그 결과 창의적 능력 및 하위 요인(유창성, 융통성, 독창성, 상상력, 사고의 민감성, 정교성) 점수는 학년이 올라갈수록 높아지는 것으로 나타났지만 하위 요인에 따라 다른 발달 양상을 보였다. 반면, 창의적 성격 및 하위 요인(호기심, 민감성, 과제집착력, 유머, 독립/모험성, 문제해결 리더십) 점수는 학년이 올라갈수록 낮아지는 것으로 나타났으며, 요인에 따라 다른 발달 경향을 보이는 것으로 밝혔다. 마지막으로 창의적 능력과 창의적 성격 점수를 합한 창의성은 학년 간에 통계적으로 유의한 차이는 없었지만, 2학년 때 낮아지다가 상승한 다음, 다시 5학년 때 낮아졌다가 6학년 때 상 승하는 W자 형태의 발달 경향을 보이는 것으로 밝혀졌다. 본 연구의 결과는 창의·인성교육에 기초한 초등학생들의 창의성 발달 경향에 관한 연구는 물론 초등학교 각 학년 특성에 적합한 창의성 교육 프로그램을 개발하는데 기여할 것이다. This study analyzed the developmental characteristics for creative ability and creative personality of elementary school students. The Korean Individual Creativity Test, developed by Kyung-Hwa Lee, was used to measure creativity. This test consists of two domains, creative abilities (flexibility, fluency, originality, elaboration, sensitivity to thinking) and creative personalities (curiosity, sensitivity, task commitment, humor, challenge, leadership of problem solving). Approximately 2,248 participants were selected all over the Korea. Developmental trends by grades was analyzed. This study demonstrated that the scores of creative thinking ability increased from the first grade to the sixth grade. There was no fourth grade slump as proposed by Torrance (1968). Rather, this result supported the increment view in creative thinking with age. Older children are supposed to be higher in creativity as their social experience and education training become broader. However, the scores of creative personality decreased from the first grade the sixth grade steadily in this study. As children get into higher grades, they are more likely to compare and evaluate with their peers. Also, they are under more peer pressure to confirm. These negative climates block the creative personality of the older students.