Strip 형 유리치은 이식술이 부착지은 형성에 미치는 영향

이동열,권영혁,박준봉,허익,정종혁,Lee, Dong-Yeol,Kwon, Young-Hyuk,Park, Joon-Bong,Herr, Yeek,Chung, Jong-Hyuk 대한치주과학회 2006 Journal of Periodontal & Implant Science Vol.36 No.2

This study was performed to evaluate the effect on the formation of keratinized attached gingiva when free gingival graft with strip technique was used. After the partial thickness flap was prepared, it was positioned apically more than 7mm using mucoperiosteal suture. At the donor site, strip was achieved with 2mm width, less than 1mm thickness, (mesiodistal teeth length + 6)$^{\ast}$2 mm length. Then, it was divided into 2 same pieces and located at the recipient bed apico-coronally with more or less 3mm interval. Follow-up check was made at 1,2,4,8,12 weeks after the operation. The results of this study were as follows : 1. The inter-strip space was mostly filled with keratinized attached gingiva. 2. The contraction of the graft was nigligible, and 92% of planned area was filled with keratinized attached gingiva. 3. The inconvenience of the patients at donor site was minimal. 4. The width of the strip was widened. In conclusion, free gingival graft using strip technique is useful to achieve the keratinized attached gingiva maximally with free gingival graft minimally and to minimize the inconvenience of donor palatal site of the patients.

수소/공기/희석제 혼합기의 점화지연과 화학반응 특성연구

이동열,이의주,Lee, Dong Youl,Lee, Eui Ju 한국안전학회 2021 한국안전학회지 Vol.36 No.3

Hydrogen is considered a cleaner energy source than fossil fuels. As a result, the use of hydrogen in daily life and economic industries is expected to increase. However, the use of hydrogen energy is currently limited because of safety issues. The rate of combustion of the hydrogen mixture is about seven times higher than that of hydrocarbon fuels. The hydrogen mixture is highly flammable and has a low minimum ignition energy. Therefore, it presents considerable risks for fire and explosions in all areas of hydrogen manufacturing, transportation, storage, and use. In this study, the auto-ignition characteristics of hydrogen were investigated numerically for diluted hydrogen mixtures. Auto-ignition temperature, a critical property predicting the fire and explosion risk in hydrogen combustion, was determined in well-stirred reactors. When N₂ and CO₂ were used to dilute the hydrogen/air mixture, the ignition delay time increased with increasing dilution ratios in both cases. The CO₂-diluted mixtures exhibited a longer ignition delay than the N₂-diluted mixtures. We also confirmed that lower initial ignition temperatures increased the ignition delay times at 950 K and above. Overall, the auto-ignition characteristics, such as the concentrations of participating species and ignition delay times, were primarily affected by the initial temperature of the mixture.

3D 게임영상 작성법에 관한 연구

이동열,Lee Dong-Lyeor 한국콘텐츠학회 2005 게임&엔터테인먼트논문지 Vol.1 No.1

게임개발에 사용되어지는 여러 가지 공정 중 게임제작의 정확한 흐름. 그리고 제작에 대한 이해가 보다 정확한 게임을 제작하리라 여긴다. 게임의 원인제공이 되는 영상제작에 있어 정확한 공정이해와 3D게임영상제작이해에 중심을 둔다. 실제 게임제품에 있어서는 게임을 기동했을 때에 표시되는 오프닝 무비, 이벤트 때에 삽입되는 Cut Scene등의 영상이 이 방법으로 생성되고 있다. 게임과는 다르지만 극장 영화에 있어서 특수효과 영상에서 3D게임영상이 이용되는 것이 게임 제작 시 고려되어야 할 그래픽이다. 게임플레이어가 보다 정확한 원인제공으로 그 게임에 몰입 할 수 있는 원인을 제공하리라 여겨진다. Correct flow of various game manufacture among the justice which is used at the game development. and The understanding about the manufacture regards we making rather correct game. We justice understanding which we are correct in the image manufacture to become the reason air control of the game and We put the center in a 3B game image manufacture understanding. we are marked in maneuvered the game in actual game good. The image of the back of Cut Scene which is inserted at an opeuning incomparableness event time, we have been produced in this method. The thing which a 3D game image is utilized in a special effectiveness image though it is different from the game in the theater movie, we are the graphic which a game manufacture o'clock must be considered. The reason air control which the game player Is rather correct, we are regarded we offer the reason to immerse with his game.

E-PON의 상향 대역전송 성능 향상을 위한 동적대역할당 메커니즘 연구

이동열,오승엽,Lee, Dong-Yeal,Oh, Seung-Hyeub 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.8b

IEEE는 E-PON에 대한 구현 표준으로 IEEE802.3ah을 제정하였으나 구체적인 상향대역할당 메커니즘에 대해서는 별도로 규정하지 않고 제조업체의 몫으로 남겨 두었다. 이에 관련 전문가들은 E-PON에서의 상향 전송에 대한 성능 개선 및 다양한 서비스 수용을 위해서 여러 방식의 상향대역할당 기법들을 연구하였다. 본 논문에서는 상향 트래픽 전송 성능을 개선하는 동적대역할당 메커니즘을 제안한다. 이 메커니즘은 ONU의 상향전송 큐별로 최소보장 상향대역을 다양하게 설정할 수 있도록 하였으며, 큐에 대기 중인 패킷을 전송하기 위하여 큐별로 가중치를 부여한 DRR(Deficit Round Robin) 기법을 적용하였다. 시뮬레이션에 의해 상향대역 이용률이 기존방식 대비 10% 이상 개선됨을 보여 주었다. IEEE ratified IEEE802.3ah as the standard of E-PON, while it leaved the specific method of upstream bandwidth allocation as a role of implementation vendors. Many experts have researched the method of enhancing upstream bandwidth throughput and released related papers. This paper presents another novel mechanism to enhance upstream throughput. This mechanism performs the management of upstream queues by giving the minimum bandwidth of different level to each queue. In order to process packets on each queue we adopted a modified weighted DRR technology. By doing so, the transmission throughput of upstream packets can be largely enhanced. The experimental simulation of this mechanism showed an enhancement of bandwidth utilization more than 10% in comparison to legacy method.

급성기 요통의 치료에서 경판의 유용성 평가

이동열,이수길,류헌식,Lee, Dong-Yeul,Lee, Soo-Keel,Ryu, Heon-Sik 대한한의정보학회 2005 大韓韓醫情報學會誌 Vol.11 No.2

Objectives The aim of this study is to evaluate effects of hard board applied to acute low back pain patient by using Visual Analogue Scale(VAS) and Pain Rating Score(PRS). Methods From March. 2005 to October. 2005, 20 cases of acute low back pain were divided into 2 groups in sequence. Control group took a rest on the bed(marble-sponge mattress) and sample group took a rest on the hard board. Visual Analogue Scale(VAS) and Pain Rating Score(PRS) were used to assess the change of pain. VAS and PRS were checked 3 times before the treatment, after 3day treatment and 6day treatment. Results 1. After 3day and 6day treatment, there was statistical significance between control and sample group by VAS. 2. After 3day and 6day treatment, there was statistical significance between control and sample group by PRS. Conclusions On treating acute low back pain, it is more effective taking a rest on the hard board than taking a rest on the bed. Further study is needed about effects of hard board applied to acute low back pain patient.

채널 결합 기반 대용량 방송서비스를 위한 유효 대역폭 추정 알고리즘에 대한 연구

용기택(Kitak Yong),신현철(Hyunchul shin),이동열(Dongyul Lee),유웅식(Woongsik You),최동준(Dongjoon Choi),이채우(Chaewoo Lee) 大韓電子工學會 2012 電子工學會論文誌-TC (Telecommunications) Vol.49 No.3

현재 HFC(Hybrid Fiber Coaxial) 망에서 UHD(Ultra High Definition) 콘텐츠와 같은 대용량 방송콘텐츠 전송을 위한 대표적인 전송기술로, 다수의 채널을 결합시켜 논리적인 하나의 광대역 채널로 변경하여 데이터를 병렬 전송하는 방법이 대두되고있다. 하지만 채널 결합을 통해 콘텐츠를 전송하는 시스템의 경우 하나의 콘텐츠 전송을 위해서 다수의 채널을 결합하기 때문에 채널 자원의 부족이 예상된다. 따라서 결합된 채널을 효율적으로 사용할 수 있는 기술이 필요하다. 본 논문에서는 결합된 채널의 효율적인 대역폭 사용을 위하여 세 가지 방식의 VBR(Variable Bit Rate) 대역폭 추정 알고리즘을 분석하였다. 세 가지의 유효 대역폭 추정 방식은 Guerin이 제안한 가우시안 근사를 통한 유효 대역폭 추정, Lee가 제안한 비디오 프레임 특성을 기반으로 한 유효 대역폭 추정과 Nagarajan이 제안한 가우시안 트래픽을 기반으로 한 유효 대역폭 추정 알고리즘이다. 또한, 이들을 분석하여 대용량 방송 시스템으로의 적용가능성을 평가하였다. 성능 분석을 위한 시뮬레이션은 OPNET 시뮬레이터를 사용하였고, 성능 분석의 정확성을 위해 실제 HD 방송 트래픽을 분석하여 대용량 방송 트래픽을 생성하였다. A parallel transmitting system with channel bonding method have been proposed to transmit mass content such as UHD(Ultra High Definition) in HFC(Hybrid Fiber Coaxial) networks. However, this system may lead to channel resource problem because the system needs many channels to transmit mass content. In this paper, we analyze three effective bandwidth approximation algorithms to use the bonding channel efficiently. These algorithms are the effective bandwidth of Gaussian approximation method algorithm proposed by Guerin, the effective bandwidth based on statistics of video frames proposed by Lee and the effective bandwidth based on Gaussian traffic proposed by Nagarajan. We also evaluate compatibility of algorithms to the mass broadcasting service. OPNET simulator is used to evaluate the performance of the algorithms. For accuracy of simulation, we make mass source from real HD broadcasting stream.

증례 : 순환기 ; 좌전하행지에서 기원하는 우관상동맥을 가진 환자에서 발생한 심근경색

이동열 ( Dong Yeol Lee ),이혜정 ( Hye Jung Lee ),강상현 ( Sang Hyeon Kang ),김은석 ( Eun Seok Kim ),이동현 ( Dong Hyun Lee ),박종성 ( Jong Sung Park ),강은주 ( Eun Ju Kang ) 대한내과학회 2014 대한내과학회지 Vol.86 No.5

단일 관상동맥 기형 중에서도 좌전하행지에서 우관상동맥이 시작되는 기형은 극히 드물며 임상적인 중요성도 분명히 밝혀져 있지 않다. 저자들은 좌전하행지에서 우관상동맥이 시작되는 단일 관상동맥 기형을 가진 환자에서 발생한 급성 심근경색증에 대해 관상동맥 중재시술을 시행하였다. 좌관상동맥 조영 검사로 좌회선지의 완전폐색을 확인하였으나 관상동맥 기형에 대한 이해 및 주의부족으로 우관상동맥이 좌전하행지로부터 시작되는 기형이 동반되었음을 인지하지 못하여 우관상동맥을 찾기 위해 불필요하게 시간을 허비 하였다. 좌회선지의 병변에 대한 중재시술 후 환자가 안정된 상태에서 좌관상동맥 조영 검사를 다시 시행하였으며 심장의 윤곽 안에서 비정상 우관상동맥의 위치 및 주행경로를 확인한 후 우관상동맥이 좌전하행지로부터 시작되는 혈관기형이 있는 것으로 진단하였다. 저자들은 좌전하행지에서 우관상 동맥이 시작되는 단일 관상동맥 기형에 대한 이해 부족으로 관상동맥 중재시술 중 겪어야 했던 시행착오와 해당 혈관기형의 임상적 의의를 문헌고찰과 함께 보고하는 바이다. A 55-year-old male underwent coronary artery intervention for an acute myocardial infarction of the inferior or lateral wall. The initial left coronary angiogram showed total occlusion of the proximal left circumflex artery (LCX). There was an abnormal coronary artery originating from the mid-portion of the left anterior descending artery (LAD) and running to the right ventricular side. However, we could not identify the anomalous right coronary artery (RCA). We tried to find the RCA in the right coronary cusp to confirm the infarction-related artery, but failed. A focused left coronary angiogram in the posteroanterior projection revealed the entire anatomy of the anomalous RCA. An anomalous origin of the RCA from the LAD is a rare coronary artery anomaly that might affect the physician`s decision during coronary intervention. We report an anomalous origin of the RCA from the mid-LAD and discuss the anatomy and clinical significance. (Korean J Med 2014;86:618-622)

자동차 차체조립 공차 해석을 위한 용접 변형과 용접 순서의 고려

이동열(Lee, D. Y.),이재열(Lee, J. Y.),김국생(Kim, K. S.),임현준(Yim, H. J.),지해성(Jee, H. S.),이규봉(Lee, G. B.) (사)한국CDE학회 2004 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2004 No.2

Pd/Cu/PVP 콜로이드를 이용한 고종횡비 실리콘 관통전극 내 구리씨앗층의 단차피복도 개선에 관한 연구

이동열(Dongryul Lee),이유진(Yugin Lee),김현종(Hyung-Jong Kim),이민형(Min Hyung Lee) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.2

The seed step-coverage enhancement process (SSEP) using Pd/Cu/PVP colloids was investigated for the filling of through silicon via (TSV) without void. TEM analysis showed that the Pd/Cu nano-particles were well dispersed in aqueous solution with the average diameter of 6.18 nm. This Pd/Cu nano-particles were uniformly deposited on the substrate of Si/SiO2/Ti wafer using electrophoresis with the high frequency Alternating Current (AC). After electroless Cu deposition on the substrate treated with Pd/Cu/PVP colloids, the adhesive property between deposited Cu layer and substrate was evaluated. The Cu deposit obtained by SSEP with Pd/Cu/PVP colloids showed superior adhesion property to that on Pd ion catalyst-treated substrate. Finally, by implementing the SSEP using Pd/Cu/PVP colloids, we achieved 700% improvement of step coverage of Cu seed layer compared to PVD process, resulting in void-free filling in high aspect ratio TSV.

인덕턴스 변위센서를 이용한 위치센싱 기법연구

이동열(Dong-Yeol Lee),이원두(Won-Doo Lee),이재용(Jae-yong Lee),이창민(Chang-min Lee),강동우(Dong-woo Kang) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.7