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.

청간소요산으로 호전된 설통 환자 3례

김연진,양승보,김정화,이상화,조승연,박성욱,박정미,고창남,Kim, Yeon-jin,Yang, Seung-bo,Kim, Jeong-hwa,Lee, Sang-hwa,Cho, Seung-yeon,Park, Seong-uk,Park, Jung-mi,Ko, Chang-nam 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.4

Objectives: This clinical study reports the effects of Cheonggansoyo-san (CSS) on three patients with glossodynia. Methods: Three patients with glossodynia were treated with CSS (i.e., an herbal medicine) and acupuncture. Numeric rating scales (NRSs) for glossodynia and dry mouth and hwa-byung questionnaire scores were evaluated, and the results from heart rate variability (HRV) evaluations were analyzed. Results: After treatment with CSS, three patients' glossodynia symptoms, such as burning sensations, tingling, and numbness of the tongue, were improved. NRS ratings for glossodynia and dry mouth and the hwa-byung questionnaire scores also improved, and HRV parameters were closer to the normal range. Conclusion: Cheonggansoyo-san could be used to treat glossodynia.

데이터 글러브를 이용한 손 제스처 기반 3차원 게임 구현

유다연,권차욱,곽지민,백화현,김이조,차경애 대구대학교 정보통신연구소 2010 情報通信硏究 Vol.7 No.1

데이터 글러브(Data Glove)는 손 제스처를 정의하여 시스템을 제어하는 입력장치로 가상현실기술 및 교육, 의료, 산업분야에서 많이 사용되고 있다. 이는 가상현실 속에 존재하는 사물을 현실에서 제어하게 함으로써 사용자에게 마치 현실 세계의 사물을 제어하는 느낌을 주는 장점을 가지고 있다. 이에 본 논문에서는 이러한 데이터 글러브의 장점을 이용하여 3차원 게임에 적용시키는 방법을 제안한다. 먼저 데이터 글러브로 제스처를 정의하고, 트래커(Tracker)와 연동하여 시스템을 구현한다. 구현된 시스템을 실험하기 위해서 OpenGL로 인형 뽑기 게임을 구현하고 사용자가 데이터 글러브를 착용 후 정의된 제스처를 통해 게임을 제어하도록 한다. 본 논문에서 제안한 방법은 사용자들에게 좀 더 높은 몰입감을 제공하며, 향후 게임 산업 발전에도 많은 영향을 줄 것으로 기대한다.

抗癌丹을 投與한 胃癌 患者 105例에 對한 臨床報告

유화승,최우진,이용연,서상훈,조정효,이연월,손창규,조종관 대전대학교 한방병원 2000 惠和醫學 Vol.9 No.2

Clinical studies were carried out 105 cases of patients with stomach cancer treated by Hangamdan(抗癌丹) from January 1th 1998 to September 30th 2000. The results were summarized as follows; 1. Distribution of those attached by stomach cancer, by sex, showed that Male is more then Female, by age, showed that the number of forties, fifties, sixties are majority. 2. Distribution of diagnostic stage, in descending order; stage Ⅲ(45.1%, top), stage Ⅳ(40.2%). 3. The effects of maintenance and improvement in the symptoms with traditional oriental therapy(77.8%) and combined treatment of western and oriental therapy(92.3%) were observed. The effects of the symptoms were as follows; abdominal pain (16.3%), general body weakness(10.5%), nausea&vomiting (8.6%), diarrhea(6.7%) and etc, in orders. 4. Analysis of hematology attached by stomach cancer, maintenance and increasing of WBC(89.4%), RBC(63.6%), Hgb(62.3%), Platelet(95.6%) were observed. After taken Hangamdan, the safety of the liver and kidney were as follows; maintenance and decreasing of AST(85.3%), ALT(91.6%), BUN(84.8%), Creatinine(92.4%) were observed. 5. Analysis of IL-12 and IFN-γ attached by stomach cancer, increasing of IL-12(39.1%), IFN-γ(69.6%) were observed. 6. Analysis of QOL attached by stomach cancer, maintenance and improvement of combined treatment of western and oriental therapy(91%), traditional oriental therapy(85.2%) were observed. 7. Analysis of survival in patients with Ⅳ stage of stomach cancer, above 6 months(17.1%), 12 months(85.2%) were observed. 8. Analysis of antitumor effects, maintenance of traditional oriental therapy(81.5%) and maintenance and improvement of combined treatment of western and oriental therapy(89.7%) were observed. Analysis of tumor marker attached by stomach cancer, maintenance of CEA(85.7%) were observed. 9. Analysis of curative valuation, maintenance and improvement of traditional oriental therapy(77.7%), combined treatment of western and oriental therapy(82.1%) were observed. From the above results, it is suggested that Hangamdan has significant effects of antitumor and immune activity, also could be usefully applied for stomach cancer patients by combination with western therapy or alone.

일부 노인의 우울과 생활 만족도에 관한 연구

金蓮花 영남이공대학 1997 論文集 Vol.26 No.-

This study was conducted to submit a basic material to help the efficient nursing intervention which reducing depression and improving life satisfaction of the elderly in community. The period of data collection was from August, 4, 1997 to August, 23, 1997 and a total 162 woman aged over 65 were studied who were registered in "house for the aged" in 4 low-income areas located at Taegu. Korea. Analysis of the data was done by use of percentage, t-test, ANOVA and Pearson Correlation Coefficient For the post hoc of the ANOVA, Scheffe test is used. The results of study are summarized as follows; 1. According to whether they have mate or not(P = .019), perceived level of family relationship(P = .000), perceived level of health(P = .000) and perceived economic status(P .000), the level of depression showed difference statistically. But, each age group of the elderly, whether they have religion or not, educational background, family living together concreteness, pocket money and whether they participating in social activities or not, the level of depression did not show any difference statistically. 2. According to each age group of the elderly(P = .021), whether they have religion or not(P = .013), perceived level of family relationship(P = .000), perceived level of health(P = .000) and perceived economic status(P = .000), the level of life satisfaction showed difference statistically. But, educational background, whether they have mate or not, family living together concretness, pocket money and whether they participating in social activities or not, the level of life satisfaction did not show any difference statistically. 3. The significant negative correlation between depression and life satisfaction of the elderly observed(r = -.669, P = .000). Therefore, for the successful aging of the elderly in the community, we should develop and provide nursing care which control the variables affecting to depression and life satisfaction of the elderly.

침적 모형에 의한 습성침적 플럭스 수치모의

이화운,문난경,임주연 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12

The purpose of this study is to estimate wet deposition flux and to investigate wet deposition characteristics by using the ADOM model. Wet deposition flux of high reactive SO_2 is estimated by applying observed meteorological parameters and concentrations of chemical species to the ADOM model. Wet deposition is largely dependent on large scale precipitation and cloud thickness. Wet deposition flux of sulfate increases, but wet deposition flux of SO_2 is small. On the whole, the pattern of sulfate flux agrees with the typical pattern of sulfate wet deposition that is high in the summer(July) and low in the winter(January)

유치원 교육 실습 내용 및 현황 연구

유연화 경복대학 2001 京福論叢 Vol.5 No.-

본 연구는 유치원에서의 교육실습 현황 및 내용을 분석하여 체계적이고 효율적인 교육실습 방안을 모색하는 기초자료를 제공하고자 하였다. K대학 유아교육과 학생 123명을 대상으로 교육실습 후 실습형태, 실습내용, 지도교사의 실습지도 현황, 실습 만족도에 대해 설문 조사하였다. 연구결과는 다음과 같다. 첫째, 실습교사는 일일평균 9.88시간(토요일 2.79시간)을 유치원에서 실습하였으며 둘째, 실습교육활동은 자유선택활동(총 199회)에 비해 집단활동(총 313회)이 많이 이루어졌다. 셋째, 실습생들은 일부 지도교사가 활동실행이나 평가를 제대로 하지 않고 방치한다고 응답하였으며, 실습에 대한 만족도는 34.1%로 나타났다. This study was conducted to analyse student teachers' practicum contents and to provide the basic data for systematical and effective teaching practicum process in kindergarten. A questionaire was administered to 123 student teachers after practicum in order to gain information about practicum contents, attitudes of supervising teachers, and practicum satisfactions. The findings of this study were as follows: First, student teachers took practicum average 9.88 hours a day (Saturday 2.79 hours) during their practicum. Second, student teachers had group activities(total 313) more than free play activities(total 199). Third, student teachers thought that some of supervising teacher can't do well activity practices and evaluation. And the practicum satisfactions of student teachers were 34.1%.

어머니의 언어적 상호작용과 유아의 어휘 사용과의 관계 연구

유연화,권세경 경복대학 1998 京福論叢 Vol.2 No.-

본 연구는 만 3세 유아를 대상으로 하여 자연스러운 가정상황에서의 어머니와 유아의 언어적 상호작용의 양 및 언어적 상호작용의 유형과 그에따른 유아의 어휘 사용관계에 대해 알아봄으로써, 유아의 어휘 발달에 영향을 미치는 어머니의 언어적 상호작용의 중요성에 대해 살펴보았다. 연구에서 나타난 결과를 통하여 어머니의 언어적 상호작용의 중요성을 재인식 할 수 있으며, 어머니의 언어적 상호작용의 양과 유형은 유아의 어휘사용과 밀접한 관계를 갖는다는 것을 알 수 있었다. The purpose of this study is to see the relationship of mother's language interaction & young children's vocaburary development. The subject in the study were 10 preschool children, the mean age being 54.7 months. The data for this study was collected at natural home setting that was audiotaped &transcribed for 180 minites. Through this study, it can be shown that the amounts & types of mother's language interaction affects the development of child's vocaburary. And also we recognized the impotance of mother's language interaction.

한국어에 나타난 여성언어의 특징에 관한 연구

이화연,홍영예 이화여자대학교 영미학연구소 2003 영어학 연구 Vol.- No.8

Language reflects and records social and cultural differences in a speech community. Among these differences, this study focuses on gender differences, for most societies differentiate between men and women in various marked ways. Thus, the primary aim of this study is to investigate the dynamic relationship between gender and language use, especially the characteristics of women's speech in Korean. Based on previous research on women's speech in English, this study attempts to examine five characteristics of women's language through oral interviews and questionnaires. The results of this analysis of women's language are as follows: 1) Fine color discrimination is more relevant for women than for men. 2) Women frequently use meaningless particles or weaker expletives, while the stronger expletives are reserved for men. 3) Women are apt to use some specific adjectives that are largely confined to them. 4) In expressing personal feelings or opinions, women's speech comes across as much more polite than men's. They tend to avoid confirmation and commitment. 5) Whereas men prefer colloquial speech, women use more grammatical vocabularies and sentences that conform to grammatical standards.

장구균의 동정에 대한 PCR 방법의 유용성

최연화,이영선,김홍빈,김치경,김봉수 대한감염학회 2001 감염 Vol.33 No.2

Background : Enterococci are important cause of nosocomial infections. Recently, vancomycin-resistant enterococci (VRE) has been increasingly reported as significant nosocomial pathogens. Therefore, accurate identification of enterococcal species is a prerequisite step for the appropriate antibiotic treatment and epidemiologic surveillance. We wanted to know the usefulness of PCR method compared with Vitek automatic identification system. Methods : Totally 105 isolates were identified on the species level by Vitek (GPI card and software version R06.1), methyl-α -D-glucopyranoside test, and PCR methods. Results : Among 105 enterococcal isolates, 59 were identified as E. faecium, 11 E. faecalis, 6 E. gallinarum by Vitek. But 29 isolates (28%) were unidentified. Subsequently all of these isolates were analyzed by PCR, the results of which were as follows : 17 E. faecium, 5 E. casseliflavus, 7 E. gallinarum. Two isolates identified as E. gallinarum by Vitek were reidentified as E. casseliflavus by PCR and other methods far phenotypic characterization. Conclusoin : PCR method was more accurate and sensitive than Vitek for the identification of enterococci species. (Korean J Infect Dis 33:123∼127, 2001)