도재전장주조관의 순측 치경부 변연 적합도에 관한 주사전자현미경적 연구

김영한,이선형,Kim, Young-Han,Lee, Sun-Hyung 대한치과보철학회 1985 대한치과보철학회지 Vol.23 No.1

The purpose of this study was to evaluate the marginal fitness of collarless metal-ceramic crown formed with direct lift technique using wax compared with metal-ceramic crown with metal butt margin. Twenty crowns, ten were collarless metal-ceramic crowns and ten were metal-ceramic crowns with metal butt margins, were made and cemented on epoxy resin dies, and their marginal openings were measured on scanning electron microphotographic prints at x200 magnification. The results were as follows; 1. In the case of collarless metal-ceramic crowns, the mean marginal opeining was $43.78{\pm}17.67{\mu}m$, the mean maximum marginal opening was $52.81{\pm}19.81{\mu}m$, and the mean minimum marginal opening was $34.99{\pm}16.58{\mu}m$. 2. In the case of metal-ceramic crowns with metal butt margins, the mean marginal opening was $47.62{\pm}25.55{\mu}m$, the mean maximum marginal opening was $61.90{\pm}24.39{\mu}m$, and the mean minimum marginal opening was $34.86{\pm}24.92{\mu}m$. 3. There was no significant difference between two types of crowns at the 99% confidence level. 4. The marginal fitness of collarless metal-ceramic crown formed with direct lift technique using wax was clinically acceptable.

LCFQ ( Linear Clock Fair Queueing ) 알고리즘의 설계와 성능 분석

김영한,이재용,Kim, Young-Han,Lee, Jae-Yong 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.1

종합 서비스망에서, 트랙픽을 발생시키는 각각의 플로우에 대하여 QoS(Quality of Service)를 적절하게 제공하기위해서는 호스트와 라우터에 자원 예약뿐만 아니라 효율적인 트랙픽 스케쥴링이 채택되어야 한다. 본 논문에서는 가상시간이 선형적으로 증가하는 새로운 페어 큐잉 알고리즘에 제안한다. 본 논문에서 제안된 알고리즘은 각 플로우에 대하여 기존의 SCFQ(Self-Clocked Fair Queneing) 알고리즘과 유사한 구현 복잡성을 갖으면서 더 감소된 최대 지연와 평균 지연시간을 제공하고 공평성 측면에서도 개선됨을 보여준다. 또한 자신에게 할당된 대역폭보다 더 많은 트랙픽을 발생시키는 플로우에 의해 다른 플로우는 영향을 받지 않도록하는 독립성 특성 또한 SCFQ보다 더 좋은 성능을 보인다. 본 논문에서는 제안된 알고리즘에 대한 공평성을 증명했고, 최대지연과 평균지연시간에 대한 시뮬레이션 결과를 나타냈다. In order to provide appropriate Quality of Service(QoS) guarantee to each traffic flow in intergrated service networks, an efficient traffic scheduling algorithm as well as resource reservation must be adopted in host and transit routers. In this paper, a new efficient fair queueing algorithm which adopts a linearly increasing virtual time is presented. The proposed algorithm is fair and the maximum and mean delay guaranteed of each flow are less than those of the SCFQ(self clocked fair queueing) algorithm which is one of the most promising traffic scheduling algorithm, while providing low implementation complexity as the SCFQ scheme. And, it has the better isolation provided than SCFQ, which means that each flow is much less influenced by the violating traffic flows provided its allocated bandwidth gurantee. The fairness of the proposed algorithm is proved and simulation results of maximum and mean delay presented.

주강계 저열팽창 주조합금의 열팽창 계수와 경도에 미치는 Mo , V 첨가의 영향

김영한,윤의박,문병문,홍영명 ( Young Han Kim,Eui Park Yoon,Byoung Moon Moon,Young Myung Hong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.5

N/A For enhancing the mechanical properties of LTE (low thermal expansion) cast steel, systematic researches have been carried out. The effects of alloying elements such as vanadium, molybdenum and carbon on the hardness and linear thermal expansion coefficient were investigated. In the range of 0.5∼2.3 wt% carbon, addition of 1.73 wt% carbon caused hardness increase due to the formation of eutectic carbide having high hardness but over the range of 1.73 wt% carbon, hardness was decreased. Thermal expansion coefficient increases with carbon contents. In the LTE cast steel containing 0.6 wt% carbon, hardness increased up to 1.96 wt% vanadium addition. But over the range of 1.96 wt% vanadium hardness was decreased by coarse eutectic carbide. Thermal expansion coefficient of LTE cast steel containing 0.6 wt%carbon moderately increased with increasing vanadium contents. There was no significant variation of hardness and thermal expansion coefficient according to molybdenum content in LTE cast steel. (Received June 29, 1998)

Neonatal Onset Isovaleric Acidemia with Novel Mutation

김영한,배은주,박형두,이홍진,Kim, Young Han,Bae, Eun Ju,Park, Hyung-Doo,Lee, Hong Jin The Korean Society of Inherited Metabolic Disease 2016 대한유전성대사질환학회지 Vol.16 No.1

Isovaleric acidemia is autosomal-recessively inherited and an inborn error of metabolism caused by abnormal leucine metabolism due to the genetic defect of IVD (Isovaleryl-CoA dehydrogenase). IVD corresponds to mitochondrial matrix enzyme that acts on converting isovaleryl-CoA into 3-methylcrotonyl-CoA in the leucine catabolism. The IVD gene is located at Chromosome 15q14-q15, particularly between base pair 40,405,485 and base pair 40,435,948. It consists of 12 exons and has been reported to cause over 50 diseases so far. We conducted IVD gene test on the patient with acute isovaleric acidemia and confirmed a new type of mutation for the first time. As a result of analyzing the IVD gene sequence, we found out that c.129T>G(p.Asn43Lys) and c.1033A>G(p.Asn345Asp) mutations exist as heterozygosity at Exon 1 and Exon 10 respectively, novel mutation.

열처리에 의한 도재용 Ni-Cr합금 표면의 변화에 관한 연구

김영한,이선형,양재호,정헌영,Kim, Young-Han,Lee, Sun-Hyung,Yang, Jae-Ho,Jung, Heon-Young 대한치과보철학회 1989 대한치과보철학회지 Vol.27 No.2

The purposes of this study were to analyze the microstructural and compositional changes of metal surfaces following different conditions of preoxidizing heat treatment, to investigate the composition of metal oxides, and to evaluate the effect of preoxidation and removal of surface oxides on microstructure and diffusion profiles. The techniques of EDAX (energy-dispersive analysis of x-ray), ESCA (electron spectroscopy for chemical analysis), and EPMA (electron probe micro analysis) were used, along with SEM (scanning electron microscopy). The obtained results were as follows : 1. A surface of the specimen became rough and the amount of the metal oxides increased with increasing the heat treatment time and temperature and the partial pressure of oxygen. 2. At an air pressure of 28' vacuum, the higher the temperature and the longer the time of preoxidation, the higher Ni concentration was detected. 3. Cr concentration in the specimen heat treated with air was higher than that of with vacuum. 4. The oxides in the specimens were mainly composed of Ni and Cr oxides. On the globular growth particles, significant rises in Al concentration of Rexillium III and Ti concentration of Verabond were noted. 5. Atomic diffusion occurred at the ceramic-metal interface, furthermore the amount of the flux was increased with preoxidation heat treatment.

사립체 질환: 새로운 위대한 모방자가 될 것인가?

김영한,안석민,서영준,윤종형,배은주,이홍진,Kim, Young Han,Ahn, Seok Min,Seo, Young Jun,Yoon, Jong Hyung,Bae, Eun Ju,Lee, Hong Jin 대한유전성대사질환학회 2016 대한유전성대사질환학회지 Vol.16 No.3

Mitochondrial disease is a group of disorders caused by dysfunctional mitochondria, the organelles that generate energy for the cell. Diagnosis of mitochondrial disease is difficult, subtle, and has many problems. It is more likely to miss the diagnosis of mitochondrial disease, especially in borderline cases where the symptoms of the disease are not severe. In this regard, urine organic acid analysis is noninvasive and can increase the sensitivity and specificity through repeated load test with few changes according to the specimen. And, It is considered to be suitable as a screening test for mitochondrial diseases because it has a great advantage of distinguishing from organic aciduria, urea cycle disorder and fatty acid oxidation disorder which may have similar symptoms. The purpose of this study was to investigate the clinical features and age distribution of mitochondrial diseases diagnosed by organic acid analysis and to establish the policy of diagnosis and treatment based on this study.

연소 유동장의 PIV 가시화 측정과 제반 문제들

김영한,윤영빈,정인석,Kim, Young-Han,Yoon, Young-Bin,Jeung, In-Seuk 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.4

PIV(Particle Image Velocimetry) is a recently developed technique for visualizing the fluid velocity fields. Because it has several advantages over the LDV(Laser Doppler Velocimetry), it became one of the most popular diagnostic tools in spite of its short history. However, its application to combustion is restricted by some problems such as flame illumination, scattered light refraction, particle density variation due to heat release, the combined effect of abrupt change in particle density and fluid velocity on flame contour, and thermophoresis which is particle lagging due to temperature gradient. These problems are expected to be originated from the non-continuous characteristics of flames and the limitations of particle dynamics. In the present study, these problems were considered for the visualization of the instantaneous coaxial hydrogen diffusion flame. And the instantaneous flame contour was detected using particle density difference. The visualized diffusion flame velocity field shows its turbulent and meandering nature. It was also observed that the flame is located inside the outer shear layer and flame geometry is largely influenced by the vorticity.

긍정적 행동지원이 뇌성마비아의 수업관련 행동에 미치는 영향

김영한 ( Kim Young-han ),권순우 ( Kwon Soon-woo ),박정민 ( Park Jung-min ),서영 ( Seo Young ),이진옥 ( Lee Jin-ok ),하은정 ( Ha Eun-jung ) 대구대학교 특수교육재활과학연구소 2016 특수교육재활과학연구 Vol.55 No.4

본 연구에서는 긍정적 행동지원이 뇌성마비아의 수업관련 행동을 구체적으로 파악하고자 한다. 이를 위하여 수업관련 행동의 어려움을 가지고 있어 유치원의 누리과정 적용 및 운영에 어려움이 있는 뇌성마비아 3명을 연구의 대상으로 선정하였다. 본 연구문제를 구체적으로 알아보기 위하여 동일한 상황 및 목표행동을 보이는 여러 명의 연구대상에게 유사한 행동변화에 대한 중재전략의 효과를 입증할 수 있는 대상자간 중다기초선설계를 적용하였다. 연구 결과, 긍정적 행동지원은 뇌성마비아의 수업참여행동인 주의집중하기와 지시따르기 등을 증가시키는데 효과적이였으며 안정적으로 유지되었다. 그리고 긍정적 행동지원은 뇌성마비아의 과제수행행동인 과제집중하기, 또래와 협력하기에 효과적이었으며 향상된 과제참여행동은 안정적으로 유지되었다. This study attempts to explore in detail the effects of positive behavior support upon class relative behavior of children with cerebral palsy. For this purpose, the subjects of this study selected were three children with cerebral palsy who had difficulty in implementation and operation of kindergarten Nuri education process due to their difficulty of class relative behavior. To examine research questions in detail, this study applied the multiple baseline design between the subjects which could prove the effect of mediating strategy about similar behavior change to multiple subjects showing identical situations and objective behavior. As a result, positive behavior support was found to be effective in increasing `attention concentration` and `instruction compliance` as class participation behavior of children with cerebral palsy, and to be kept stabilized. And positive behavior support was found to be effective in `assignment concentration` and `peer cooperation` as assignment performance behavior of children with cerebral palsy, and the increased assignment participation behavior was kept stabilized.

정수장 슬러지의 토지환원 가능성 연구

김영한(Young Han Kim),장기운(Ki Woon Chang) 한국수처리학회 1995 한국수처리학회지 Vol.3 No.2

Recently, needs for utilization of sludge from water treatment plants(alum sludge) have been increased with shortage of landfill sites and difficulties of the treatment and disposal processes. In this study, the properties of the alum sludge were investigated in the laboratory and field tests, and the feasibility studies for using of W.T.P.`s alum sludge with agricultural materials were also investigated. And composting alum sludge with sewage sludge and saw dust were investigated. The major components of alum sludge were SiO₂(15-55%), Al₂O₃(19-36%), Fe₂O₃(2-6%), and several elements like agricultural soils. The raw alum sludge and composted sludge were good for a growth of tested plants and roots of rice-strouts and for anti-insect effects. The interference in the growth of plants which got a little influence from aluminum ions existed in soil was not shown when 2-3㎏/㎡ of sludge were applied to the farm land, and no change in components was shown in the plants compared to the result of fertilization.

복합화학공정의 설계와 제어

김영한 (정) ( Young Han Kim ) 한국화학공학회 1993 추계학술발표논문집 Vol.- No.-