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Sung-Eun Yang(양성은),Yoon-Sun Yang(양윤선),Chul-Won Ha(하철원) 대한정형외과학회 2004 대한정형외과학회지 Vol.39 No.5
목적: 저자들은 인간 제대혈(umbilical cord blood)에서 간엽 줄기 세포를 분리 및 확인할 수 있었고, 이들 세포군에 대하여 골, 연골 및 지방세포로의 분화가 가능하였기에 이를 보고하고자 한다. 대상 및 방법: 제대혈(n=411)로부터 단핵세포군을 원심분리 방법을 이용하여 분리한 후 배양하였으며, 5-8회 개대배양 시에 1,000배 이상의 증식을 보인 세포군에 대하여 간엽줄기세포 및 타 세포계열 표면항원 검사를 시행하였다. 분리된 간엽줄기 세포군에 대하여 골, 연골 및 지방세포로의 분화를 시도하였다. 결과: 총 411개의 제대혈 중 95개(23.1%)에서 첫 배양 시 간엽 줄기 세포양 세포군(MSC-like cell population)이 확인되었으며, 5-8회 개대배양 시 1,000배 이상의 증식을 보인 세포군은 9개(2.2%)였다. 이들 세포군은 기존에 알려진 모든 간엽줄기세포 표면항원검사에 양성, 타 세포계열 표면항원 검사에는 모두 음성이었다. 분리된 간엽 줄기 세포군은 골, 연골 및 지방세포로의 분화가 가능하였다. 결론: 본 연구의 결과는 인간 제대혈이 서로 다른 세포 계열로 분화할 수 있는 간엽줄기세포를 포함하고 있다는 사실을 지지하는 것으로 판단된다. 인간 제대혈은 상대적으로 많은 양의 간엽줄기세포를 비교적 용이하게 얻을 수 있다는 장점이 있는 세포 공급원이 될 수 있을 것으로 사료되며, 향후 조직 공학 및 세포 치료를 위한 세포 공급원의 하나가 될 수 있을 것으로 기대한다. Purpose: Human umbilical cord blood (hUCB) is well known for a good source of hematopoietic stem cells (HSCs). However, the presence of mesenchymal stem cells (MSCs) in hUCB is still not well approved by many authors. We hereby report the isolation and characterization of MSCs from hUCB, as well as their differentiation into osteogenic, chondrogenic and adipogenic lineages. Materials and Methods: Mononuclear cells were isolated from each hUCB harvest (n=411) by density gradient centrifugation, and suspended in -minimum essential medium supplemented with 10% fetal bovine serum (FBS). The cell population was expanded by successive sub-cultivation under the same condition. The cell population that showed more than 1,000-fold expansion at fifth to eighth passage was inspected with known surface antigens of MSCs and other cell lineage. The isolated MSCs were cultured in osteogenic, chondrogenic, and adipogenic condition to identify their potential to differentiate into different mesenchymal cell lineage. Results: Ninety five out of 411 hUCB units (23.1%) generated the MSC-like cell population during initial cultivation. Nine cell populations (2.2%) showed more than 1,000-fold expansion capacity at fifth to eighth passage. These cells positively expressed all known MSC-related antigens. They did not express any of myeloid, endothelial, or histo-compatibility antigens. All of the MSCs isolated showed the potential to differentiate into osteogenic, chondrogenic, and adipogenic lineages. Conclusion: Our study supports that hUCB does contain MSCs, which can be differentiated into different cell lineages. We believe hUCB will be a good source of MSCs with the advantage of availability and relative abundance. We think hUCB should not be considered as a medical waste, and it will serve as a good source of cells for tissue engineering and cellular therapy in the future.
공감과 사회적 평가가 아동의 친사회적 행동에 미치는 영향
양성은(Sung Eun Yang),정문자(Moon Ja Chung) 한국아동학회 1995 아동학회지 Vol.16 No.2
The purpose of this study was to investigate the effect of selected internal and situational factors on children`s prosocial behaviors. While child`s sex and trait empathy were chosen as internal factors, state empathy and social evaluation were regarded as situational factors. The subjects were 72 bays and 72 girls chosen from 288 eleven-year-olds. This selection was based on their emplathic scores measured by the Bryant Empathy Scale (1982). Half of the 144 children belonged to the high-trait empathic group and the other half to the low-trait empathic group. Within each of the high-and the low-trait empathic groups, equal numbers of boys and girls were randomly assigned to one of the two state empathy conditions and two social evaluation conditions. The state empathy conditions were divided into the arousal condition and the disregarding condition. To control social evaluation, subjects were led to believe that the experimenter either would or would not evaluate their donation of colorful ball-point pens to handicapped children. The data was analyzed by 4-way ANOVA (sex(2)×trait empathy(2)×state empathy(2)×social evaluation(2)). The results were that (1) children`s prosocial behaviors were significantly different by sex, state empathy, and social evaluation, and (2) children`s prosocial behaviors were not significantly different by their trait empathy level.
룸 코너 콘 칼로리미터 시험(ISO 9705)과 비교를 통한 FDS 열분해 모델의 신뢰성 분석
양성진(Sung-Jin Yang),이창덕(Chang-Deok Lee),오지은(Ji-Eun Oh),강찬용(Chan-Yong Kang),김학범(Hag-Beom Kim),이덕희(Duck-Hee Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
Actual fire test under a laboratory and fire simulation by using computer are considered into main methodology in order to estimate and predict fire size of railway train. Even if practical fire size could be obtained from the full-model railway car test such as a large scale cone- calorimeter test, it is not always possible and realistic due to that expensive cost and attendant dangers could in no way be negligible. In this point of view, fire simulation analysis method based on the computational fluid dynamics could be proposed as an alternative and it seems to be also efficient and reasonable. However, simulation results have to be verified and validated in accordance with the proper procedure including comparing analysis with the actual fire test. In this paper, fire load and growth aspect was investigated through the room corner test (ISO 9705) for the mock-up model of the actual railway car. Then, it was compared with the output data derived from the simulation by using Pyrolysis Model of the FDS (Fire Dynamics Simulator, by NIST) for the exact same domain and condition corresponding with pre-performed room-corner test. This preliminary verified and validated fire modeling method could enhance the reliability of output data derived from the fire simulation under the similar domain and condition.