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.

목운동에 따른 상반신 체표면 변화에 관한 연구

정화연,서미아 漢陽大學校 韓國生活科學硏究所 2002 韓國 生活 科學 硏究 Vol.- No.20

The purpose of this study was to investigate the changes in upper body surface lines caused by the neck movements. Experimental research was performed by gypsum method and the neck movements were consisted of 5 types (upright posture, bending down, bending backward, leaning a head to the right side, and leaning a head to the left side). The results were as follows; 1) As a result of investigating into the rate of the expansion and contraction of horizontal body surface lines, front shoulder line was moved to be inside and back shoulder line was moved to be upside. There was a negative correlation between c3∼d1 and d1∼d2. Generally, the most of front body surface lines were contracted and back lines were mostly expanded. In particular, the rate of changes in shoulder area was higher than other areas. 2) The result of the analysis of the vertical body surface lines, the length of the center back line was increased except the movement of bending backward and the length of the renter front line was decreased in the movement of bending down. 3) According to the variation rates of the body surfaces in length of standard lines, the rate of increase of the length was higher in the front than in the back. 4) According to comparative drawing of the shape of the neck, the shape of the neck in the movement of bending backward and leaning a head to the right side was hollowed than that of the movement of upright posture. But the movement of bending down and leaning a head to the left sloe was more flat. As has been observed, upper body parts whose measurements of body surface lines were differed significantly in the neck movements. Accordingly, the task of designing garments with good neck fitness should be achieved by taking the widen amount caused by the neck movements.

일부 사업장 건강증진사업 실태조사 및 요인분석

이경화,이원철,이강숙,홍현숙,송연이 가톨릭대학교 산업의학센터 2000 韓國의 産業醫學 Vol.39 No.2

For the purpose of access the health promotion activities in 138 worksite which had more than 50 workers, we surveyed the questionnaire on May and September 1998. The results of survey were as follows: 1.59 companies(45.1%) were conducting the health promotion activities. Most of them were manufacturing and located Kyung-sang province and had nurses as a health manager. 2.Companies operating the health promotion activities had significant higher degree of satisfaction and usage of welfare facilities than non-operating companies. 3.The level of knowledge for regulations, professional skills, and performance related health promotion was low in all companies. Top manager's interest and will for investment to health promotion was significant lower in non-operating companies. 4.The reasons why the health promotion program was not operated, were low budget, top manager's indifference, lack of information, work overloading, no human resource, an insufficient governmental support in order. 5.The most necessary items for program were education and promotion, budget, and governmental support. Needed personnel were nurses, fitness trainner, and necessary program were health management, exercise, nutrition, and stress counselling. For comparing before and after IMF, amount of budget was decreased. In conclusion, this study suggested that major barriers to conduct health promotion activities were lack of budget, lower interest of top managers, and insufficient professional information, therefore detail health promotion program would be developed and supported by government.

하악 비대칭의 방사선학적 연구

정연화,조봉혜 大韓口腔顎顔面 放射線學會 1998 Imaging Science in Dentistry Vol.28 No.1

The purpose of this study was to perform the radiographic measurements and temporomandibular joint evaluation in mandibular asymmetry. For this study, thirty-two patients who have mandibular asymmetry were selected and submentovertex, panoramic and lateral corrected tomographic radiographs were taken. Horizontal and vertical analysis using various landmarks on these radiographs were performed. Also radiographic and clinical evaluation of temporomandibular joint were obtained. The results were as follows; 1. On the submentovertex radiograph, the mean distance of Pogonion to midline was 5.0±3.8mm. 2. The mean distance of Pogonion to Gonion was 100.6±9.2mm in deviated side and 104.3±9.1mm in contra-lateral side, and there was a significant difference between the deviated and the contra-lateral side(p<0.001). 3. The distance difference of Pogonion to Gonion between the deviated and the contra-lateral side was significantly related to the degree of asymmetry(p<0.001). 4. On panoramic radiograph, the condylar height of the contra-lateral side was significantly longer than the one of the deviated side(p<0.001). 5. On lateral corrected tomogram, bony changes of temporomandibular joint were observed in 11 condyles of the deviated side and 9 condyles of the contra-lateral side. Erosion and osteophyte were the most common changes in both the deviated and the contra-lateral sides.

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.

두경부 림프관종의 증례보고

정연화,조봉혜,나경수 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.1

Lymphangiomas are uncommon benign congenital tumors. Most occur in the head and neck and most lesions present by the age of 2 years. We present our experience with four patients who have iymphangiomas of the head and neck with tongue involvement. First case is a 7-year-old male who has the cystic iymphangioma of left submandibular area. Second a 22-year-old female has a lesion involving the border outright tongue. Third case is the iymphangioma which occurs in the right upper lip of a 6-year old male. The last patient is a 28-year old male who fell down and whose right face was swollen up. He had undergone an operation and been treated with steroid before. The characteristic appearances of imaging methods were described and all lesions best depicted on T2-weighted images. Our experience indicates that MRI is useful in the diagnosis and treatment planning of iymphangioma. (Korean J Oral Maxillofac Radiol 2000; 30: 87-91)

효과적인 영어교육에 대한 고찰

이화연 명지대학교 인문과학연구소 1998 인문과학연구논총 Vol.17 No.-

동북아 지역의 외래어 수용 양상에 대한 연구

이화연,강윤옥,이미숙 이화여자대학교 영미학연구소 2005 영어학 연구 Vol.- No.10

The primary aim of this study is to examine the different patterns of accepting foreign cultures through a cross-linguistic analysis of loan words in Korean, Chinese, and Japanese. Based on the data collected from 2000 to 2002, the investigator analysed the loan words of Korean, Chinese, and Japanese in terms of five different categories: IT(Information Technology), high-technology, computer, internet, and multi-media broadcasting. This study also investigated the characteristics of individual loan words, their transcribed patterns, and their specific features of word formation. The results of the study showed the similarities and differences of patterns in formulating loan words among the three East-Asian countries.