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박승현(Seung-hyun Park),이정태(Jung-Tae Lee),한치문(Chi-moon Han) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.1
ATM망은 정보를 일정 셀 단위로 취급하는 고속의 패킷 통신망이므로 전송된 셀 간에는 지연시간의 편차가 발생한다. 그러나 ATM망이 음성과 같은 동시성 트래픽을 수용하기 위해서는 지연시간 편차로 인해 생긴 손실된 셀을 보상해 주어야 한다. 본 논문에서는 기존의 CDV 보상방법을 살펴보고, 셀이 지연되어 도착될 경우에도 셀의 일부분을 이용하여 복원하는 부분셀 보상방법을 제안하고 그 성능을 분석하였다. CDV 보상방법들의 성능은 시뮬레이터를 제작하여 측정하였다. 본 논문에서 제안한 부분셀 보상방법은 기존의 셀단위 보상방법보다 성능이 우수하였고 지연시간 편차가 큰 경우에 더욱 우수한 성능을 나타내었다.
마이크로 볼로미터 초점면 배열에서 전기-열적 피드백 현상이 신호에 미치는 영향
박승만(Seung-man Park),한승오(Seungoh Han) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
In this paper, the analytical models for the electrothermal feedback of a μ-bolometer focal plane array(FPA) are proposed and applied to the conceptually designed FPA to investigate the electrothermal feedback effect on bolometer FPA signal. The temperature and resistance change of the μ-bolometer by the electrothermal feedback(ETF) model are increased upto 20 and 35.7 % of those of no feedback case, respectively, while those by the effective thermal conductance(ETC) model increased 8.5 and 15.1 %. The integration current and output voltage of a CTIA used as an column amplifier of FPA are also increased upto 41.6 and 32.4 % by the ETF model, while increased upto 17.2 and 13.5 % by the ETC model. The proposed models give more accurate temperature change, accordingly larger signal than no feedback considering case. Electrothermal feedback effect should be considered to design a high performance and high density μ-bolometer FPA. The proposed models are very useful to investigate the transient thermal analysis, also considered to be useful to predict the responsivity and dynamic range of μ-bolometer FPAs.
대량의 태아-모체간 출혈이 동반된 Anti-Mia에 의한신생아 동종 면역성 용혈성 질환 1례
박승원 ( Seung Won Park ),박재한 ( Jae Han Park ),김령 ( Young Kim ),유주희 ( Ju Hee You ),조형민 ( Hyeong Min Cho ),김은영 ( Eun Young Kim ),김경심 ( Kyoung Sim Kim ),김용욱 ( Yong Wook Kim ) 대한주산의학회 2013 Perinatology Vol.24 No.4
Authors experienced a newborn treated with severe anemia transferred to our hospital due to pulselessness and apnea shortly after birth. Laboratory analysis of the blood on admission revealed hemoglobin 3.1 g/dL, reticulocyte 11.0%. Kleihauer-Betke test for fetal hemoglobin from maternal blood was seen Hgb F 7%, then we suggested almost 180 ml fetomaternal hemorrhage. But, anemia was not improved despite repeated packed RBC transfusion. So, we evaluated the other cause of intractable anemia. The results were as follows; the Coombs` test was positive. The antibody identification test using mother`s serum revealed anti-Mia antibody. The patient improved with supportive treatment, but got hypoxic brain injury due to massive fetomaternal hemorrhage. At day 29, the infant was doing well and was discharged. We report a case of neonatal isoimmune hemolytic disease due to anti-Mia with massive fetomaternal hemorrhage with a brief review of the related literatures.
KI-180과 KI-188 칼슘조성물이 어린쥐의 성장발육에 미치는 영향
박승만(Seung-Man Park),성기승(Ki-Seung Seong),이종석(Jong-Seok Lee),이옥환(Ok-Hwan Lee),한찬규(Chan-Kyu Han) 한국식품과학회 2014 한국식품과학회지 Vol.46 No.3
본 연구에서는 KI-188 칼슘과 KI-180 조성물이 성장발육에 미치는 효과를 조사하였다. 시험기간중 KI-188 칼슘과 KI-180 식이군이 대조군 보다 성장률과 평균 식이섭취량은 증가하였다. 체장은 KI-188 칼슘과 KI-180 식이군이 대조군에 비해 평균 3.55 mm 더 길었고, 등뼈길이는 KI-180 식이군이 대조군 보다 통계적인 차이는 없었지만 0.5 mm 더 길었다. 대퇴골 무게는 KI-188 칼슘과 KI-180 식이군이 대조군에 비해 통계적으로 무거웠으며, 대퇴골길이는 대조군에 비해 각각 평균 0.89, 1.09 mm 더 길었다. 혈당, 총콜레스테롤 및 중성지방 농도는 차이가 없었고, 칼슘농도는 KI-188 칼슘과 KI-180 식이군 보다 대조군이 유의하게 높았다. 백혈구와 혈소판수는 차이가 없었고, 적혈구, 혈색소 및 헤마토크릿치는 대조군이 KI-188 칼슘과 KI-180 식이군 보다 통계적으로 높았다. ALP활성은 KI-180 식이군이 대조군 보다 통계적으로 높았고, osteocalcin농도는 KI-188 칼슘과 KI-180 식이군이 대조군에 비해 통계적으로 유의하게 높았다. 혈청 testosterone 농도는 KI-188 칼슘과 KI-180 식이군과 대조군 간에 차이가 없었다. IGF-1과 IGFBP-3 농도는 KI-180 조성물이 대조군 보다 각각 20%, 11% 정도 유의하게 더 높았다. 이상의 결과를 검토할 때 KI-188 칼슘과 KI-180 조성물은 어린쥐의 성장과 골격의 발달을 촉진시키고, 성장호르몬의 분비능을 양적으로 유도하여 전반적인 성장발육에 유효한 작용이 있는 것으로 사료된다. Herbs have active components that promote the growth rate of both animals and human. The KI-180 and KI-188 calcium food formulae contain Acanthopanacis cortex, Bombysis corpus and hoelen, seaweed calcium, chlorella extract, spirulina, colostrum powder, and other natural and functional components. We evaluated the growth-promoting effects of these formulae by analyzing the weight, femur and backbone, alkaline phosphatase, osteocalcin, testosterone, insulin-like growth factor (IGF)-1, and IGF binding protein-3 (IGFBP-3) of growing rats. Growing rats administered with KI-180 and KI-188 calcium showed the increase of body weight, body length, and femur weight and length of growing rats. In addition, administration of KI-180 and KI-188 calcium increased the alkaline phosphatase activity, the levels of osteocalcin and the growth hormones IGF-1 and IGFBP-3 of growing rats. The impact of KI-180 and KI-188 calcium on the physical development of growing rats suggests that the incorporation of these food formulae in the diets of growing children may promote the physical development.
VDT 사용자의 Pelvic Tilt와 Lumbar Lordosis의 간접 측정 방법론
박승원(Seung Won Park),곽은정(Eun Jung Kwak),김동현(Dong Hyun Kim),김한성(Han Sung Kim) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.5
Objective: The aim of this study is to develop and verify an indirect method for estimating sitting posture by observing pelvic tilt and lumbar lordosis of visual display terminal (VDT) users. Background: Depending on the wrong sitting posture, musculosketal disorders (MSDs) such as low back pain may occur. In the case of the general public, it is impossible to observe the sitting posture quantitatively. Therefore, we developed a system that can estimate the user’s sitting posture through two IMUs. Method: Five participants were conducted test. Participants conducted paperwork for each one hour through a computer. When participants are working, we took video (Kinect V2, USA), measuring body pressure distribution by pressure mat (X3 LX100, Canada) and lumbar angle by two IMUs every fifteen minutes. Results: Results showed that lumbar lordosis and pelvic tilt of the subject could be indirectly estimated with only two IMUs. We could identify posterior pelvic tilt in user’s sitting posture as time goes on. Conclusion: This result can be alternative method of observing and evaluating the sitting posture of a person using VDT for a long time. Application: The results can evaluate the sitting posture of the VDT users, and can lead to sitting in a good posture.
박승만(Seung-Man Park),한승오(Seungoh Han) 대한전기학회 2016 전기학회논문지 Vol.65 No.7
Since a flash light produces enormous amount of photon energy in short time, not only electro-optic and infrared(EO/IR) systems utilized for Intelligence Surveillance Target Acquisition and reconnaissance(ISTAR) activities but also the people of a combat field can be severely influenced by a high flash light bursting in front of them. The people who bumped into a flash could not escape such enormous amount of photon energy, resulting in being blind temporarily or even permanently. In order to investigate the effect of a high flash source on a human eye, it is essential to know how much photon energy be incident into an eye from the flash source. In this paper, the model of irradiated photon energy to individuals from some flashes is proposed. The proposed irradiated photon energy per unit area of retina is based on taking the situation to be modeled as a simple EO system in front of a flash light. The validity of proposed model was proved by the application of the model to human on the surface of the earth with the well known light source, the Sun. The model of this study can be utilized to simulate the retinal intensity and energy of a flash for various conditions such as the illumination levels, the distance from a flash busting site, luminous intensity and time of a flash.