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박찬경(Chan-Kyeong Park),최면(Myeon Choe),주진순(Jin-Soon Ju) 한국식품영양과학회 1993 한국식품영양과학회지 Vol.21 No.6
위암은 모든 한국인에 있어서 발병율이 높은 성인병이며 또한 식이 중 Na 섭취와 관련이 있는 질병으로 알려져 있는바, 본 연구는 건강한 구성원만을 가진 정상 인군과 위암환자가 있는 가족의 구성원을 대상으로(환자 자신은 제외) Na 섭취패턴을 분석하여 비교하고자 하였다. 위암환자 가족의 고추장, 김치류, 국류, 육류반찬류중 Na함량이 정상인 가족에 비해 유의적으로 높고 기타 식품군내 Na 함량도 높아 위암환자 가족군의 Na 섭취량이 많음을 알 수 있었다. 그러나 소변내 Na 배설량은 위암환자 가족군이 오히려 낮은 경향을 보여 장기간의 Na 다량섭취가 인체내 Na 대사에 변화를 가져올 수 있을것으로 생각된다. Purpose of this study was to investigate intake pattern of sodium in the family members of normal and stomach cancer patients, excluding patients themselves. Every food samples that they consumed for 3 days, drinking water, hot pepper paste, soybean paste and soy sauce from the each family were collected for Na analysis. Three days of morning urine from the each subjects was collected for determination of urinary Na excretion. Sodium contents of hot pepper paste, pickles, soups and meats in stomach cancer families were significantly higher than those in normal families. However, urinary sodium excretion between the two groups was not different. This suggests that sodium metabolism in human may be altered with a long-term intake of sodium-rich foods.
박찬경(Park Chan-Kyeong),김상수(Kim Sang-Soo),김기환(Kim Ki-Hwan),김영국(Kim Young-Guk) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The resistance to motion is a basic characteristic used to model the running performance for a train and to plan the service operation of trains. It comprises of the rolling resistance, slip resistance and aerodynamic forces. Resistance to motion can be obtained by measuring the acceleration or deceleration of a train during a coasting test or by estimating the required tractive efforts to maintain constant speed. This paper have proposed the two methods to obtain the acceleration or deceleration of a train when a train is coasting and verified by comparing the actual test results for these method.
박찬경(Park Chan-Kyeong),김상수(Kim Sang-Soo),김기환(Kim Ki-Hwan),김영국(Kim Young-Guk) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The High speed electrical multiple train having a distributed electrical motor system has just been developing to aim the experimental maximum speed at 400㎞/h since August, 2007. This project comes in stage of critical design and so, it needs to take some review and analysis the characteristics of suspensions on the view of design. The vehicle model for dynamic analysis is upgraded from the basic design model with 12 linear dampers, 8 non-linear dampers, 8 bush and 12 shear springs. The non-linear dampers are the secondary yaw dampers and lateral dampers that generally have non-linear characters. The optimization technique is applied to search the proper range of non-linear characteristics for the damper elements to satisfy the curving stability performance at speed 110m/s (about 400km/h). The results shows there are some optimum points according to the variation of characteristics and it would be useful to make a decision to select the proper suspension elements in the precision design that will be done by the manufacturing company.
수소연료전지의 성능 향상을 위한 다공성 표면에서의 물 제거에 대한 연구
이경민(Kyeong-Min LEE),박찬경(Chan-Kyung Park),손도협(Do-Hyeop Son),강우성(Woo-Seong Kang),박상혁(Sang-Hyuk Park),현승혁(Seung-Hyuk Hyun),김한상(Han-Sang Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Polymer electrolyte membrane fuel cells (PEMFCs) have been considered as the power sources to replace internal combustion engines. Water is generated in the catalyst layer of PEMFC and excessive water can cause flooding. It is still an important task to remove water properly to prevent flooding. Hence, proper water management in PEMFCs is a core issue for improving performance and longevity. This study presents the experimental approach to understand the water removal behavior on porous gas diffusion layer (GDL) surfaces in the flow channel of PEMFC. To do this, a sample GDL/flow channel model was fabricated to investigate the water transport characteristics in a PEM fuel cell using direct ex-situ water visualization. Using a high-speed camera, the process from growth to detachment of water droplets is photographed for two types of GDL samples (with micro porous layer (MPL) and without MPL). The contact angle hysteresis (CAH) according to droplet aspect ratio (DAR) at water droplet detachment is mainly investigated is compared with the static contact angle (SCA) of the GDL surface. In addition, at detachment, the DAR and CAH according to air Reynolds number are compared with the SCA. These data show that the adhesion of the GDL surface has a dominant effect on water removal on porous surfaces. It is expected that the data from this study can contribute to the basic design of GDL structures with enhanced water removal characteristics.
황금 추출물이 조골세포와 파골세포의 활성에 미치는 영향
신정민(Jeong Min Shin),박찬경(Chan Kyung Park),신은주(Eun Ju Shin),조태형(Tae Hyung Jo),황인경(In Kyeong Hwang) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.6
황금 추출물이 조골세포와 파골세포에 미치는 영향을 세포수준에서 관찰하고자 하였다. 조골세포에 미치는 영향을 관찰하기 위하여, mouse calvaria 유래의 MC3T3-E1 osteoblastic cells를 이용하여 세포 생존률, 염기성 인산분해효소 활성, 골석회화 형성능을 측정하였다. 또한 미분화된 파골세포 전구세포로부터 파골세포의 생성 및 활성에 미치는 영향을 관찰하기 위하여, murine macrophage 유래인 Raw 264.7 cells를 이용하여 M-CSF와 RANKL을 처리하여 파골세포의 분화를 유도하였고, TRAP에 양성인 다핵세포의 형성을 관찰하여 황금추출물이 파골세포의 형성에 미치는 영향을 알아보았다. 황금 추출물이 MC3T3-E1 세포의 증식에 미치는 영향을 MTT assay로 측정한 결과, MC3T3-E1 세포는 처리한 황금 추출물의 농도에 의존적으로 세포의 증식이 촉진되는 경향을 나타내었으며 특히 1 ㎍/mL 농도에서 130.4%의 증식 효과를 나타내었다. 또한 황금 추출물이 세포에 독성을 나타내지 않는 범위(0.01-1 ㎍/mL)에서 MC3T3-E1 세포의 ALP activity를 측정한 결과, 농도에 의존적으로 ALP activity가 증가하였으며 1 ㎍/mL 농도에서 152.0%의 ALP 활성 증가효과를 나타내었다. 황금 추출물의 최적 작용 농도 1 ㎍/mL에서 골석회화 형성능을 측정한 결과, 배양 시간에 따라 계속 증가하여 배양 20일째는 대조군에 비해 223.3%의 석회화 형성능을 나타내었다. 황금 추출물의 파골세포 분화억제 효과를 알아보기 위해 황금 추출물이 세포에 독성을 나타내지 않는 범위(0.01-10 ㎍/mL)에서 TRAP staining한 결과, 황금 추출물은 0.01 ㎍/mL 농도에서 대조군에 비해 파골세포 분화를 50% 이상 감소시켰으며 농도 의존적으로 TRAP 양성 세포가 감소함을 관찰하였다. 이상의 결과로 미루어 볼 때, 황금 추출물이 골다공증을 포함한 골질환 예방에 효과가 있을 것으로 사료된다. Scutellaria radix (SR) has been utilized as a traditional medicine for a variety of diseases including Rheumatoid arthritis and its major flavonoids - baicalein, baicalin, and wogonin - have been reported to exert beneficial health effects, including anti-bacterial, anti-viral, anti-inflammatory, and free-radical scavenging. However, the mechanisms underlying this effect remain poorly understood. The principal objective of this study was to determine the effect of SR on osteoblast and osteoclast cells. SR extract was prepared using 70% ethanol solvent. Osteoblastic MC3T3-E1 cells and osteoclast precursor Raw 264.7 macrophage cells were utilized. SR extract increased MC3T3-E1 cell proliferation and stimulated alkaline phosphatase activity dose-dependently, 152.0% of the control at concentration 1 ㎍/mL. Additionally, SR extract (1 ㎍/mL) stimulated Bone nodule formation activity in MC3T3-E1 cells, approximately 223.3% of the control, 20 days after the exposure. In addition, SR extract significantly reduced the number of tartrate-resistant acid phosphatase-positive (TRAP+) multinucleated cells from Raw 264.7 cells. In conclusion, SR extract stimulates the proliferation and bioactivities of boneforming osteoblasts, and inhibits the activities of bone-resorbing osteoclasts to a certain degree.