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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.
On a Logical Path Design for Optimizing Power-delay under a Fixed-delay Constraint
이승호,장종권,Lee, Seung-Ho,Chang, Jong-Kwon Korea Information Processing Society 2010 정보처리학회논문지 A Vol.17 No.1
Logical Effort의 기법은 회로의 지연 값을 간단한 필산으로 신속하게 측정할 수 있는 기술이다. 이 기법은 설계 공정 시간을 절약하는 장점도 있지만 고정 지연이라는 설계조건에서 회로의 면적이나 전력의 최소화를 도출할 수 있는 논리 경로를 설계하는데 약점도 있다. 이 논문에서는 균형 지연 모형을 제안하고 이 방법을 기반으로 논리경로에서 전력-지연 효율성을 최적화하는 기법을 제안하고자 한다. 본 논문의 기법을 사용하여 8-input AND 게이트의 3가지 서로 다른 설계 회로를 모의 시험한 결과 기존 Logical Effort의 기법보다 약 40%정도 전력 소비의 효율성이 향상되었다. Logical Effort is a simple hand-calculated method that measures quick delay estimation. It has the advantage of reducing the design cycle time. However, it has shortcomings in designing a path for minimum area or power under a fixed-delay constraint. In this paper, we propose an equal delay model and, based on this, a method of optimizing power-delay efficiency in a logical path. We simulate three designs of an eight-input AND gate using our technique. Our results show about 40% greater efficiency in power dissipation than those of Logical Effort method.
이승호,박민기,Lee, Seung-Ho,Park, Min-Kee 한국전기전자학회 2014 전기전자학회논문지 Vol.18 No.3
Proper operation of the battery powered systems depends on the accuracy of the battery SOC(State of Charge) estimation, therefore it is critical for those systems that SOC is accurately determined. The SOC of the battery is related to the battery aging and the SOC estimation methods without considering the aging of the battery are not accurate. In this paper, a new method that accurately estimate the SOC of the battery is proposed considering the aging of the battery. A mathematical model for the Battery SOC-OCV(Open Circuit Voltage) relationship is presented using Boltzmann equation and aging indicator is defined, and then the SOC is estimated combining the mathematical model and aging indicator. The proposed method takes the aging of the battery into consideration, which leads to an accurate estimation of the SOC. The simulations and experiments show the effectiveness of the proposed method for improving the accuracy of the SOC estimation. 배터리를 사용하고 있는 시스템에서 배터리의 잔존 용량에 대한 정보는 매우 중요하며, 따라서 정확한 SOC(State of Charge)의 추정이 필요하다. 배터리는 노화됨에 따라 전체 사용 가능 용량이 줄어들고 성능이 떨어지는데 이러한 노화의 영향을 고려하지 않는 배터리의 SOC 추정 방법은 추정의 정확도가 떨어지는 단점이 있다. 따라서 본 논문에서는 배터리의 노화 상태를 고려하여 배터리의 SOC를 추정하는 새로운 방법을 제안한다. 제안한 방법에서는 배터리의 전압-SOC 특성 곡선을 Boltzmann 방정식을 사용하여 모델링하고 노화 지표를 정의하며, 노화 지표를 Boltzmann 방정식 모델과 결합하여 SOC를 추정한다. 따라서 제안한 방법은 배터리의 노화 상태를 SOC 추정에 반영하여 노화된 배터리에 대한 정확한 SOC 추정이 가능하다. 또한 새 배터리와 1년 사용한 배터리에 대한 실험과 시뮬레이션을 통하여 제안한 방법의 유효성을 확인한다.
Evaluation of Selected Sediment Transport Formulas Giving an Equilibrium Sediment Discharge
이승호,Lee Sung-ho Korean National Committee on Irrigation and Draina 1994 한국관개배수논문집 Vol.1 No.2
여러가지의 유사이동 공식들은 각 저자들의 실험실이나 현장실측치를 바탕으로 발표되었다. 그리고 저자에 따라서 본인들의 공식의 적용한계를 명백히 명시한 것도 있지만 그렇지 않은 것도 많다. 동일한 수리학적 조건에서 이 공식들이 현장에서 적용될 때 이 공식에 의한 유사량은 공식에 따라서 유사한 것도 있고 차이가 많이 나는 것도 있다. 특히 St. Venant식(물의 연속 방정식과 물의 운동량 방정식)과 유사 연속방정식을 연립하여 컴퓨터 모의시험에 이용할 때