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국내 평가 가이드 라인 제시를 위한 전동식 부항기의 특성 조사에 관한 연구
이승호,김은정,신경훈,남동우,강중원,이승덕,이혜정,이재동,김갑성,Yi, Seung-Ho,Kim, Eun-Jung,Shin, Kyung-Hoon,Nam, Dong-Woo,Kang, Jung-Won,Lee, Seung-Deok,Lee, Hye-Jung,Lee, Jae-Dong,Kim, Kap-Sung 대한침구의학회 2010 대한침구의학회지 Vol.27 No.1
Objectives : The mechanical properties of Korean electric cupping systems are studied via experimental measurements. The study aimed at establishing the fundamentals of industrialization and systemization of oriental medicine device industry, as well as improving the quality of life for many Koreans. Methods : We reviewed the studies on traditional cupping as well as modern one to fine necessary factors for electric cupping systems. To characterize the mechanical properties of Korean electric cupping systems, we measured the pressure characteristics of commercially available electric cupping system by using an automatic pressure acquisition system and a standard cup. The pumping capability was checked at 40 seconds, and the stability of the suction cup was checked at 600 seconds. We also acquired the noise level of each system in clinical setting. To check the portability of each system, we also measured its physical dimensions. We scrutinized system manuals provided by the system manufacturers. Results : It took less than 5 second to reach the pressure if the connection between the air hose and the vacuum valve of the cupping system was secure. Pressure diminished to no more than 10% for 600s for all systems. Noise levels were 55~70 dB. Increase in pressure was too fast to control for a designated vacuum level except for one product. Conclusions : The Pumping ability of the systems is impressive and reliable. Pressure retention ability of each cup is quite reliable and reproducible. Therefore, their mechanical performances were worthy of recommendation. Some of them had noise level higher than 60 dB and they were bothersome. It was also suggested that the control for low to middle pressure needed to be accomplished by the cupping system.
누드마우스에서 골 형성에 대한 BMP와 PDGF 복합사용의 효과
이승호,최병호,주석강,허진영,정재형,김병용,Lee, Seoung-Ho,Choi, Byung-Ho,Zhu, Shi-Jiang,Huh, Jin-Young,Jung, Jae-Hyung,Kim, Byung-Yong 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.2
Bone morphogenetic protein(BMP) and platelet-derived growth factor(PDGF) have been demonstrated tostimulate bone formation when applied locally in vivo. To explore whether or not the combined use of BMP and PDGF could have promotive effect and synergic interaction on bone formation in vivo, bone marrow mesenchymal stem cells were treated with BMP-2, PDGF-BB, or BMP-2 plus PDGF-BB, and then these cells were injected into the subcutaneous space on the dorsum of nude mice. The bone formation was evaluated after 12 weeks. Histomorphometric analysis demonstrated that the subcutaneous nodules formed in nude mice contained 25.3% newly formed bone in the BMP-2 treated cells, 14.4% newly formed bone in the PDGF-BB treated cells, and 8.9% newly formed bone in the RMP-2 plus PDGF-BB treated cells. The results showed that the combination of BMP-2 and PDGF-BB had neither a promotive effect nor synergic interact on bone formation in vivo.
이승호,이준영,박정주,Lee, Seoung-Ho,Lee, Jun-Young,Park, Jung-Ju 대한치과마취과학회 2004 Journal of Dental Anesthesia and Pain Medicine Vol.4 No.1
Chronic periodontitis is one of the most common disease in clinical dentistry, which needs various surgical interventions to treat the moderate to severe destruction of supporting periodontium. Most patients have fear and anxiety to these surgical procedures and some dentists also have problems to deal with these patients. Applying the conscious sedation technique in outpatient units, periodontists have become to manage their patients successfully without any fear and anxiety and increased the level of patients' satisfaction. Particularly, periodontal treatments require relative long chair-time and patients are usually reluctant to the periodontal instruments used in the oral cavity. This study is focused on the sedation procedure with intravenous midazolam infusioon performed in Department of Periodontology, Ewha Womans University Hospital. The whole procedure of intravenous midazolam sedation is briefly reviewed from patient selection to patient discharge.
이승호,박희영,이상근,용성권,음철훈,Lee, Seung Ho,Park, Hui Yeong,Lee, Sang Geun,Yong, Seong Gwon,Eum, Cheol Hun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.6
Split-flow thin (SPLITT) cell Fractionation(SF) is a technique that allows separation of particulates and macromolecules into two fractions. A gravitational SF(GSF) system is constructed and tested for its applicability for separation of dust and ground water particulates. When tested with polystyrene latex particles, experimental data were in good agreements with theory. The 9.8 and 21.4㎛ polystyrene particles were successuflly separated in a continuous mode, where the mixture is continuously fed into the GSF channel allowing separation in a large sacle. The GSF system is successfully applied to continuous separation of dust and ground water particels based on the sedimentation coefficient, which is closely related to the particle size. The separations were confirmed by microscopy and energy-dispersive X-ray (EDX) analysos.
이승호,허신,Lee, Seung-Ho,Heu, Shin 한국정보처리학회 1997 정보처리학회논문지 Vol.5 No.1
본 논문은 SRT 시스템에서 고정 우선순위 정책을 사용하는 쓰레드가 기존보다 더 빠른 응답시간과 반환시간을 갖도록 하기 위한 개선된 스케쥴링 모델과 알고리즘을 제시하였다. 보조 실행 큐를 첨가하여 고정 우선순위 정책을 사용하는 쓰레드의 빠른 실행 및 에이징(aging)에 사용하였다. 시뮬레이션을 통하여 기존의 방식과 비교하였 으며 그 결과, 새로 제안된 모델의 경우, 고정 우선순위 쓰레드의 반응시간과 반환시 간이 기존보다 향상되었다. This paper proposes an improved scheduling model and algorithm which threads in the fixed-priority policy have faster response time and turnaround time than existing ones in SRT system. Sub run queue is added into the system and is used for the quick execution and aging of threads in the fixed-priority policy. Using simulation two method are compared. The results shows that the new scheduling model gets threads in the fixed-priority policy to run faster than existing ones.
수소화처리가 다결정 $\textrm{Si}_{1-x}\textrm{Ge}_{x}$박막의 전기적특성 및 표면거칠기에 미치는 영향
이승호,이규용,소명기,김교선,Lee, Seung-Ho,Lee, Gyu-Yong,So, Myeong-Gi,Kim, Gyo-Seon 한국재료학회 1998 한국재료학회지 Vol.8 No.1
RTCVD법으로 증착된 다결정 Si$_{1-x}$Ge$_{x}$박막에서 Ge조성 증가에 따른 결정립크기변화가 표면거칠기 및 cluster크기에 미치는 영향에 대해 알아본결과, Ge조성 증가에 따라 결정립크기가 증가했으며 증가된 결정립에 의해 Cluster 크기와 표면거칠기값(RMS)들이 증가함을 알 수 있었다. 또한 증착된 다결정 Si$_{1-x}$Ge$_{x}$박막을 RF power와 온도변화에 따라 Ar/H$_{2}$플라즈마를 이용한 수소화처리를 행하여, 수소화 효과와 표면거칠기값 그리고 비저항값 변화에 대해 조사하였다. 수소화처리 후 cluster크기와 표면거칠기값은 기판온도와 RF power 증가에따라 감소함을 알 수 있었으며 특히 기판온도 30$0^{\circ}C$에서는 비저항값이 상당히 증가하였다.
이승호,정정화,Lee, Seung-Ho,Chong, Jong-Wha 대한전자공학회 1990 전자공학회논문지 Vol. No.
본 논문에서는 채널의 배선 밀도 뿐만 아니라 셀 영역 내의 배선 밀도도 효과적으로 감소시키는 새로운 over-the-cell배선 시스템을 제안한다. over-the-cell 배선 시스템은, 일반적으로 셀 영역에서의 배선 과정, 채널에서 배선될 터미널의 선택 과정, 그리고 채널 배선 과정으로 구성된다. 본 논문에서는 셀 영역에서 배선할 신호선을 효율적으로 선택하기 위하여 intersection graph 상에 채널의 배선 밀도와 다른 신호선과 교차 관계를 고려한 웨이트를 부여한다. 선택된 신호선이 feedthrough나 셀 내부 로직을 형성하는 메탈층과 교차할 경우, maze 알고리듬을 사용하여 셀 영역에 배선한다. 또한 minimum weight spanning tree를 이용하여 채널에 배선할 터미널들을 효율적으로 선택하여 채널 밀도를 감소시킨다. 채널 배선은 HAN-LACADMG의 채널 배선기를 사용한다. Benchma가 데이타를 사용한 실험과 게이트 어레이 레이아웃 시스템에 적용함으로써 본 over-the-cell 배선 시스템의 효용성을 보인다. A new over-the-cell routing system is proposed in this paper. The proposed system efficiently reduces not only the channel density but also the routing density in cell region. Generally, the over-the-cell system consists of three phases. Namely, over-the-cell routing, terminal selection and channel routing. In this paper, to select the nets to be routed over the cells, weights are assigned on the intersection graph considering both the channel density and the intersection relations among other nets. When selected nets are blocked by feedthroughs or metal layers for internal logic, they are routed by maze algorithm. Also, in order to reduce channel density, the terminals to be routed in a channel are selected using the minimum weight spanning tree. Channel routing is carried out with a channel router of HAN-LACAD_G. The effectiveness of the over-the-cell routing system is shown by the experiments with benchmark data and its application to the gate array layout system.