다양한 금속 기판재료에 따른 그래핀의 유도결합 플라즈마 화학기상 성장 특성

김동옥,트란남충,김의태,Kim, Dong-Ok,Trung, Tran Nam,Kim, Eui-Tae 한국재료학회 2014 한국재료학회지 Vol.24 No.12

We report the chemical vapor deposition growth characteristics of graphene on various catalytic metal substrates such as Ni, Fe, Ag, Au, and Pt. 50-nm-thick metal films were deposited on $SiO_2/Si$ substrates using dc magnetron sputtering. Graphene was synthesized on the metal/$SiO_2$/Si substrates with $CH_4$ gas (1 SCCM) diluted in mixed gases of 10% $H_2$ and 90 % Ar (99 SCCM) using inductively-coupled plasma chemical vapor deposition (ICP-CVD). The highest quality of graphene film was achieved on Ni and Fe substrates at $900^{\circ}C$ and 500 W of ICP power. Ni substrate seemed to be the best catalytic material among the tested materials for graphene growth because it required the lowest growth temperature ($600^{\circ}C$) as well as showing a low ICP power of 200W. Graphene films were successfully grown on Ag, Au, and Pt substrates as well. Graphene was formed on Pt substrate within 2 sec, while graphene film was achieved on Ni substrate over a period of 5 min of growth. These results can be understood as showing the direct CVD growth of graphene with a highly efficient catalytic reaction on the Pt surface.

반음절쌍과 변형된 연쇄 상태 분할을 이용한 연속 숫자음 인식의 성능 향상

김동옥,박노진,Kim Dong-Ok,Park No-Jin 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.8

본 논문에서는 언어모델과 음향모델을 개선함으로써 단위 숫자음의 인식성능 최적화에 대해 설명한다. 언어모델은 한국어 단위 숫자음 문장의 문법적 특징을 분석하고, FSN 노드를 두음절로 구성하여 오 인식률을 감소시켰다. 음향모델은 단음절로 구성되어 발성기간이 짧고 조음이 많이 생기는 불명확한 음소, 음절의 분할로 연한 오 인식을 줄이기 위해 인식단위를 반음절쌍으로 하였다. 인식단위의 특징을 효과적으로 모델링하기 위해 특징레벨에서 K-means 알고리즘(4)으로 클러스터링 하여 상태를 분할하는 변형된 연쇄 상태 분할방법을 이용하였다. 실험 결과 제안된 언어모델의 적용 후 동일 문백종속 음소모델에서 $10.5\%$, 음향모델에서 인식단위를 반음절쌍으로 하였을 경우 문백종속 음소모델에 비해 $12.5\%$, 변형된 연쇄 상태분할을 하였을 경우 $1.5\%$의 인식률을 향상시킬 수 있었다. This paper describes an optimization of a language model and an acoustic model that improve the ability of speech recognition with Korean nit digit. Recognition errors of the language model are decreasing by analysis of the grammatical feature of korean unit digits, and then is made up of fsn-node with a disyllable. Acoustic model make use of demi-syllable pair to decrease recognition errors by inaccuracy division of a phone, a syllable because of a monosyllable, a short pronunciation and an articulation. we have used the k-means clustering algorithm with the transformed successive state splining in feature level for the efficient modelling of the feature of recognition unit . As a result of experimentations, $10.5\%$ recognition rate is raised in the case of the proposed language model. The demi-syllable pair with an acoustic model increased $12.5\%$ recognition rate and $1.5\%$ recognition rate is improved in transformed successive state splitting.

표준연계프레임워크 기반 정보연계모델에 관한 연구

김동옥,최종근,정회경,Kim, Dong-Ok,Choi, Jong-Kun,Jung, Hoe-Kyung 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.4

The scale of national research and development work is expanded gradually and grows bigger, so necessity of building system rises to guarantee more objective and fairer selection of business and clarity of budget administration according to active progress of convergence between study territories. In the study, standard frame work is suggested for information connection between dissimilarities, and based on this work; the study considers the system for information connection of digital budget accounting system handling budget and accounting of national finance and national science technology knowledge information system that is in charge of result administration and result evaluation of national research and development work, so suggests application plan of standard frame work connected with information solving current state and problems for connection. 국가 연구개발 사업은 그 규모가 점차 확대되고, 대형화되어가고 있어 연구 영역간의 융복합화 등이 활발하게 진행됨에 따라, 보다 객관적이고 공정한 사업선정과 예산관리의 투명성이 담보될 수 있는 시스템구축의 필요성이 대두되고 있다. 본 연구에서는 이기종간의 정보연계를 위한 표준 프레임워크를 제안하고, 이를 기반으로 국가 재정의 예산과 회계를 총괄하는 디지털예산회계시스템과 국가 연구개발 성과관리 및 성과평가를 담당하는 국가과학기술지식정보시스템의 정보연계를 위한 시스템을 고찰하여 연계를 위한 현황과 문제점을 해결하는 표준 정보연계 프레임워크의 활용방안을 제시하고자 한다.

애니메이션 스토리 컨텐츠의 전환

김동옥,Kim, Dong-Ok 한국만화애니메이션학회 2002 만화애니메이션연구 Vol.- No.6

This study is for making new story contents in animation fields through recent theater's animation trends. It is the Anti-Disney which is totally different from the attribute of Disney animation. It has three results as following. The first, Anti-Disneymation reveals the realistic America's problems such as violence, adolescent's loneliness, the slums of black people, etc. Next, animation's main target changed from just for child to for adults using various story themes. Also, the main characters are no longer beautiful and charming one like Disney animation's one and it makes we look at the matter woman another angle and makes totally different story telling. By the results above, we might to making an effort in creating Korean style animation with lyrical expression and cultural assets.

DMB 시스템에서 UWB 전파가 서비스에 미치는 영향에 관한 연구

김동옥,Kim, Dong-Ok 한국정보통신설비학회 2005 정보통신설비학회논문지 Vol.4 No.2

본 논문에서는 UWB 시스템이 근처의 단일 장비 또는 집단 장비와의 간섭영향이 DMB 서비스에 미치는 영향에 관한 연구를 하였다. 이를 위해 UWB 시스템에서 방사되는 불요 방사 레벨에 따른 신호의 간섭을 비롯한 전파 간섭 특성이 인접 대역인 2.6425GHz SDMB(Satellite Digital Multimedia Broadcasting)와, In-band 대역인 3.4125GHz 방송 중계망과 서비스에 미치는 간섭 영향의 정도를 비교 분석하였으며, 방송 중계망과 간섭 측정 장비의 변조방식은 Impulse 방식과 OFDM 방식을 사용하였다. SDMB 시스템에서 Impulse 방식은 2m 지점에서부터 간섭 영향이 발생하여 1.4m 지점에서 방송 신호 수신이 가능한 $BER=1{\times}10^4$ 이었으며, OFDM 방식은 0.8m 지점에서부터 간섭 영향을 받아 0.5m 지점에서 방송 신호 수신이 가능한 $BER=1{\times}10^4$ 이었다. 또한 Gap-Filler 중심 주파수에 대해서는 0.01m 이상 이격 시는 간섭영향이 없었다. 따라서 소출력인 UWB 시스템의 전파가 DMB 서비스에 간섭 영향 없이 시스템에 적용하기 위해서는 Impulse 방식의 UWB 시스템보다 OFDM 방식의 UWB 시스템이 간섭 영향이 적다는 것을 확인하였다. In this paper, n system did research about effect that interference effect with neighborhood single equipment or group equipment gets in DMB service. For this, 2.6425 GHz SDMB(Satellite Digital Multimedia Broadcasting) that a special of electric wave interference is near frequency-band including interference of signal by unnecessary radiation level that is radiated in UWB system, and degree of 3.4125GHz broadcasting relay net that is In-band frequency-band and interference effect that get in service analyzed comparison ud, modulation of broadcasting relay net and interference measurement equipment used Impulse and OFDM methods. Impulse method was $BER=1{\times}10^4$ that broadcasting signal receiption is possible at 1.4m point because interference effect happens from 2m point in SDMB system, and it was $BER=1^{\times}10-4$ that OFDM method receives interference effect from 0.8m point and broadcasting signal receiption is possible at 0.5m point. Also, about gap-filler center frequency, in case of space interval more than 0.01m, there was no interference effect. Therefore, for the electric wave of W system that is small output applies to system without interference effect in DMB service, confirmed that UWB system of OFDM method is less interference effect than UWB system of impulse method.

경구기관삽관법과 경비기관삽관법의 심혈관계 영향에 대한 비교

김동옥,최영규,Kim, Dong-Ok,Choi, Young-Kyoo 대한치과마취과학회 2001 Journal of Dental Anesthesia and Pain Medicine Vol.1 No.1

Background: This prospective study was designed to compare the cardiovascular response to endotracheal insertion of either an orotracheal tube or a nasotracheal tube Methods: 120 ASA physical status I and II surgical patients requiring general anesthesia and tracheal intubation were studied and assigned to two groups: orotracheal intubation group (n = 60) and nasotracheal intubation group (n = 60). Patients were premedicated with midazolam 0.05 mg/kg and glycopyrrolate 0.005 mg/kg intramuscularly and anesthesia was induced with thiopental sodium 5 mg/kg and succinylcholine 0.1 mg/kg intravenously. Systolic blood pressure (SBP), diastolic blood pressure (DBP). mean arterial pressure (MAP) and heart rate (HR) were assessed noninvasively before induction of anesthesia and immediately after intubation, 1 min, 2 min, 3 min, and 5 min after intubation. Results: Cardiovascular responses such as SBP, DBP, MAP and HR were similar for both techniques and no significant differences between two groups were observed until 5 min after intubation. Conclusions: In healthy ASA I and II patients with normal blood pressure, induction doses of thiopental sodium 5 mg/kg and succinylcholine 0.1 mg/kg didn't attenuated the cardiovascular response to laryngoscopy and tracheal intubation. Insertion of an endotracheal tube may be the most invasive stimulus during intubation procedures. (JKDSA 2001; 1: 10-15)

제너러티브 아트(Generative Art)의 시각적 속성이 반영된 패션디자인 분석

김동옥,최정화,Kim, Dong Ok,Choi, Jung Hwa 한국의류학회 2017 한국의류학회지 Vol.41 No.5

Generative Art (also called as the art of the algorithm) creates unexpected results, moving autonomously according to rules or algorithms. The evolution of digital media in art, which tries to seek novelty, increases the possibility of new artistic fields; subsequently, this study establishes the basis for new design approaches by analyzing visual cases of Generative Art that have emerged since the 20th century and characteristics expressed on fashion. For the methodology, the study analyzes fashion designs that have emerged since 2000, based on theoretical research that includes literature and research papers relating to Generative Art. According to the study, expression characteristics shown in fashion, based on visual properties of Generative Art, are as follows. First, abstract randomness is expressed with unexpected coincidental forms using movements of a creator and properties of materials as variables in accordance to rules or algorithms. Second, endlessly repeated pattern imitation expresses an emergent shape by endless repetition created by a modular system using rules or 3D printing using a computer algorithm. Third, the systematic variability expresses constantly changing images with a combination of system and digital media by a wearing method. It is expected that design by algorithm becomes a significant method in producing other creative ideas and expressions in modern fashion.

주조용 Matchplate Pattern 제조기술

김동옥,여인동,Kim, Dong-Ok,Yeo, In-Dong 한국기계연구원 1985 기계연구원소보 Vol.14 No.-

동해백토(주) 벤토나이트(BS)에 대한 생형용 점결제로서의 특성조사

김동옥,홍영명 ( D . O . Kim,Y . M . Hong ) 한국주조공학회 1982 한국주조공학회지 Vol.2 No.4

국제동향 - 국제전문간호사회의를 통해 본 전문간호의 국제적 동향

김동옥,Kim, Dong-Ok 대한간호협회 2000 대한간호 Vol.39 No.4