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.

일부 지역 노인의 건강증진 생활양식에 관한 연구

최연희,김연화 韓國保健敎育.健康增進學會 2001 보건교육건강증진학회지 Vol.18 No.3

This study was done describe health promoting lifestyle and to determine affecting factors in elderly based on the health promoting behaviors. The specific purpose of this study was to examine the relationships of life satisfaction, self-esteem and the demographic characteristics to health promoting lifestyle and to determine causal factors affecting the elderly. The subjects were a volunteer sample of 200 elderly in Kyungsan city. The instruments for this study were Health Promoting Lifestyle Profile(47 items), Life Satisfaction Scale(20 items) and Self-Esteem Scale(10 items). Frequency, percentage, t-test, ANOVA, Pearson's correlation coefficient and stepwise multiple regression technique with SAS program were used to analyze the data. The results of the study are as follows; 1)The average item score for the health promoting lifestyle was 3.3; the highest score on the subscale was self-actualization(M=3.5) with the lowest being exercise(M=2.9) 2)Health promoting lifestyle was significantly different according to marital status and religion. 3)All of the subscales on health promoting lifestyle were positively related to life satisfaction(r=0.534, p<0.001) and self-esteem(r=0.608, p<0.001). The life satisfaction was positively related to self-esteem(r=0.593, p<0.001). 4)Life satisfaction, self-esteem and marital status explained 28.04% of the variance for the total health promoting lifestyle. The results of this study show that life satisfaction, self-esteem and marital status predicted the health promoting lifestyle of the elderly. So health promoting programs that Increase life satisfaction and self-esteem should be developed to promote a healthy lifestyle of the elderly.

冬蟲夏草의 抗轉移와 免疫增進에 關한 硏究

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

This experimental study was carried out to evaluate the effects of Cordiceps sinensis on the antimetastasis and immune activity. In order to investigate the effect of Cordiceps sinensis, the followings were performed; Cytotoxicity, inhibition of MMP-2 & MMP-9 gene expression, fraction of CD4+, CD8+, CD19+ in splenic cell, the moprphological change of splenic cells, gene expression of IL-12(p35), IL-12(p40), IFN-?? and splenic cell proliferation by CS-E. The results were obtained as follows. 1. CS-E did not present cytotoxic effect on L+14, B16-F10 melanoma cells and HMCB. 2. CS-E inhibited MMP-2 and MMP-9 gene expression more effectively compared with control group. 3. CS-E inhibited invasion of B16-F10 melanoma cells more effectively compared with control group. 4. CS-E helped CD4+, CD8+, CD19+ expression more effectively compared with control group. 5. CS-E activated phagocytic cells in spleen more effectively compared with control group. 6. CS-E helped IL-12(p35), IL-12(p40), IFN-?? gene expression in splenic cell more effectively compared with control group. 7. CS-E activated splenic cell proliferation more effectively compared with control group. From above findings, it is suggested that CS-E is able to inhibit metastasis of cancer and activate immune response system.

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)

전주시의 상수처리에서 하천수와 호소수의 비교분석에 관한 연구

안연준,최정화 대불대학교 1997 論文集 Vol.3 No.1

The study on the water treatment plant of Jikok, Sangkwan, and Daeseong for one year showed that items, such as hydrogen ion concentration, Dissolved Oxygen, Suspended Solid and nitrate, etc., varied respectively, but all items coincide with the standard values. But in Jikok water treatment plant, coliform bacteria increased rapidly, and the value of BOD also increased. The study on treated water seemed that all items except nitrate and sulfonate properly treated and agreed to the standard values. In case of chlorine residues, they were found much during winter, so it needs shortening the input during winter season.

초고속 통신망에서 비디오의 주관적 품질 평가에 관한 연구

강명화,강진석,최연성,김장형 제주대학교 산업기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.1

According to information communication business faces with competitions in a various spheres with the development of multimedia and information communication, the time when we have to make an effort to improve a quality comes from an era when we devote ourselves to quantitative expansion. we will try to perform quality assessments of real-time interactive multimedia service, and so on - in this research and present criteria of new subjective quality assessments which is fit on Korea by analyzing examples of ITU-T and foreign countries and Korea.

유아기 자녀를 둔 아버지의 역할 인식과 수행에 관한 조사 연구 : 경기(포천, 의정부) 지역을 중심으로

유연화,최경애 경복대학 1997 京福論叢 Vol.1 No.-

유아의 성장 발달에 있어 아버지 역할의 중요성이 지적되고 있으나 어머니에 비해 아버지의 역할 인식과 수행에 관한 연구는 미흡한 편이다. 본 연구에서는 유아기 자녀를 둔 아버지 자신의 역할에 대한 인식과 역할 수행 정도를 알아보고자 경기(포천, 의정부)지역의 아버지를 대상으로 조사 연구하였다. 본 연구의 이론적 배경으로 아버지 역할에 대한 개념 및 인식의 변화를 살펴보고 그에 관한 선행 연구를 고찰한 후 그 결과를 분석하였다. 본 연구를 통해 나타난 결과를 요약하면 다음과 같다. 첫째, 유아기 자녀를 둔 아버지의 역할에 대해 가장 중요하게 생각하는 것은 「가족간의 사랑과 화합을 위해 노력하는 역할」로 나타났다. 둘째, 아버지의 역할 수행 정도를 알아 본 결과 「자녀에 대한 애정을 직접 표현한다」의 항목이 가장 높게 나타났다. 셋째, 유아기 자녀를 둔 아버지의 역할 인식과 수행 정도간 상관은 r=.43으로 나타났다. 즉 제시된 문항에 대해 중요하다고 인식한 점수의 합이 높은 아버지일수록 실제 역할 수행을 더 많이 하는 것으로 나타났다. A Study on Recognition and Practice of Paternal roles. The importance of the father's role as a vital factor in early childhood development has been pointed out constantly. But few studies has been carried out in this area than in the role recognition and practice of mothers'. For the study a survey on a father's role recognition and practice, the fathers with children attending kindergarten in Pocheon and Euijongbu area were selected. As for the theoretical background of the study, the concept of the father's role and change of recognition were reviewed through preceeded studies, and then the findings were analyed. 1. 'Building love and harmony in a family' was thought to be the most important role carried by a father. 2. To perform the above role as a father, the surveyed samples answerd that they express love to their children directly most often. 3. The survey shows that there is a corelations between the recognition and role practice as of r=.43.

西歐 代替醫學의 癌 治療에 關한 硏究

兪和承,李容淵,徐祥熏,崔宇鎭,曺政孝,李淵月,孫彰奎,趙鍾寬 대한한방종양학회 2000 대한한방종양학회지 Vol.6 No.1

At here, we investigated the historical background, current stage, and concrete therapies of altematives in cancer therapy. We obatined the conclusion below. 1. Alternative medicine(AM) is a unothodoxial medical physiology, medical practice or intervension that overcome the side effects. faults, limits of coventional medicine. 2. Recentely, as emerging New-age movement, collgpse of Decarte's mecanical cosmology, and emphasis on patient rights, the interest of AM is increased, and foreign & domestic use rates of AM are risen. 3. After coventional medicine in cancer therapies tha depends on poerations, radiations, and chemotherapy is bounded, Altematives in cancer therapy are rapidly developed, and the majority of users are often considered satisfactory. 4. Alternatives in cancer therapy are classified six boundaries; Diet and Nutrition, MInd-body Technique, Integrated System, Pharmacologic and Biologictreatments, Immuno Enhanced Therapy, Immuno Enthaced Therapy, Natural and herbal medicine. 5. Looking at contents of Alternatives in cancer therapy, we get to know most of them are similar to the treatment of oriental medicine in holistic method, therapy, philosophy. If we synthesize the alternative medicine's treatment mentioned above and investigate it with oriental medical viewpoint, that may help us approach the conquest of cancer and improve the rate of cure. that may help us approach the conquest of cancer and improve the rate of cure. 6. It is certain that foreign AM will be imported reversely, and we must prepare for rebuilding of Korean traditional AM systemically, investing for activity positively, making national policy for medical system.

抗癌丹을 投與한 大腸癌 患者 83例에 대한 臨床報告

이용연,서상훈,유화승,최우진,조정효,이연월,손창규,조종관 대한한방종양학회 2000 대한한방종양학회지 Vol.6 No.1

Climical studies were carried out 83 cases of patients with colorectal cancer treated bv Hangamdan(抗癌丹) from January lth 1998 to September 30th 2000. The results were summarized as follows; 1. Distribution of those attached by colorectal cancer, by sex, showed that Male is more then Female, by age, showed that the numbber of fifties is majorith. 2. distribution of diagnostic stage, in descending order; stage Ⅲ(53%, top), stagew Ⅵ(45.8%). 3. The effects of maintenance and improvement in the symptoms with traditional oriental therapy(83.3%) and combined treatment of westem and oriental therapy(92.1%)were boserved. The effects of the symptoms were as folows: diarrhea(37.3%),abdominal pain (25.3%), general body weakness(22.9%), nausea(20.5%) and etc. in orders. 4. Analysis of hematology attached by colorectal cancer, maintenance and increasing of WBC(89.9%), RBC(74.7%), Hgb(81.1%), Platelet(92.4%) were Observed. After taken Hangamdan, the satety of the liver and kidney were as follows; maintenance and decreasting of AST(85.9%), ALT(94.8%) , GTP(87.5%), Creatinine(90.9%) were observed. 5. of IL-12 and IFN-λ attached by colorectal cancer, increasing of IL-12(53.3%), IFN-λ(80%) were observedl. 6. Analysis of QOL attached by colorectal cancer, maintenance and improvement of combined treatment of western and oniental therapy(89.6%), traditional oriental therapy(83.3%) were observed. 7. Analysis of survival in patients with Ⅳ stage of colorectal cancer, above 7 months(18.4%), 12 months(65.8%). 8. Analysis of antitumor effects, maintenance of traditional oriental therapy(83.3%) and maintenance and improvement of combined treatment of western and oriental therapy(80.5%) were observed. Analysis of tumor marker attached by colorectal cancer, maintenance and decreasing of CEA(78.8%) were boserved 9. Analysis of curative valuation, maintenance and improvement of traditional oriental therapy(83.3%), combined treatment of westem and oriental therapy(72.7%) were observed.

보육실습교사가 경험한 실습유형에 따른 보육실습실태

유연화,최경애,오애순 한국영유아보육학회 2004 한국영유아보육학 Vol.0 No.37

The purpose of this study is to analyze the practice areas and contents of student teaching program in child care centers, in which student teachers investigated the sort of practice activities according to have their experience during their practice period. This study was surveyed 324 under-graduate students who finished in child care center located in Seoul and Kyunggido. 349 questionsheets had distributed, and 324 respondents had answered it, that were analyzed with T-test, ANOVA, χ². The finding of this study were as follows: First, student teachers took practice average 9 hours and 58 minutes for a day, and they worked classroom for 80% of the practice time. Practicing Student teachers of 66.7% carried only in one classroom and others were rotated from a classroom to another. Second, student teachers had average 7.72% free play activities and 9.47% group activities. Private child care centers took more free play activities(arts, books, music area) and group activities(literature, music activities) than public. Third, almost student teachers assisted to children in snack and lunch every day or 3-4 times in routine practice. Forth, It was presented that student teachers were not coached by their instructor about charge of business practice. Fifth, It showed that student teachers used to participate classroomcleaning and teaching materials-arrangement from "participation degree of miscellaneous task" almost in everyday.