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이호윤(Hoyoon Lee),이상윤(Sangyoon Lee),박용근(Yongkeun Park),신세현(Sehyun Shin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
It is commonly known that slight alteration of erythrocyte deformability lead to serious microcirculatory diseases such as retinopathy, nephropathy, etc. Various methods and technologies have been developed to diagnose such membrane properties of erythrocytes. In this study, we developed an innovative method to measure hemorheological characteristics of the erythrocyte membrane using a light scattering analysis. Light scattering intensity through multiple erythrocytes and its phasic information were obtained. The light scattering analyses were compared between healthy control and artificially hardened erythrocytes which were treated with glutaraldehyde. These results were further compared with conventional assays. We found that light scattering information would reflect the disturbance of membrane fluctuation in artificially damaged erythrocytes. Therefore, measuring viscoelasticity of erythrocyte membrane using light scattering signal could facilitate fast and precise diagnose of pathological state on erythrocyte as well as related complications.
조선 블록조립공장에서 용접 정보를 이용한 실적집계 및 모니터링 방안
안의국(Eui Koog Ahn),이호윤(HoYoon Lee),이대형(DaeHyung Lee),윤태혁(Tae Hyuck Yoon),강용우(Yong Woo Kang),왕지남(Gi Nam Wang),박상철(Sang Chul Park) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
During this time of global recession, the shipbuilding industry is exerting much effort to make profits, gradually intensifying the competition. In shipbuilding, however, the Engineering To Order (ETO) production method and production process are difficult and frequently changeless. Thus, the shipbuilding process must be actively reflected on the schedule plan rather than setting up a fixed plan once and sticking to it. For this purpose, a monitoring system must be developed, which obtains field performance data as accurately and quickly as possible. However performance data collection are difficult without a performance data collecting and monitoring system. In this paper, a method for identifying the progress of detailed processes for blocks by facilitating the data input into the block erection process, and for differentiating fitting and welding using the current values obtained from the welding machine, present. Furthermore, this paper propose a method of identifying the work progress of blocks through a correlation equation between the welding length and arc time of the block based on the acquired current data. Then the proposed method verify through experiments and suggest for progress management in block assembly shop of shipbuilding.
마이크로 스터러의 기하형상이 혈소판 활성화 및 응집에 미치는 영향
김계휴(Gyehyu Kim),이호윤(Hoyoon Lee),최세환(Seawhan Choi),신세현(Sehyun Shin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Platelets play a vital role in both hemostasis and thrombosis in blood circulatory systems. When platelets are exposed with high shear stress or with agonists, they are activated and aggregated. In our previous research, we had suggested that a new diagnostic method for platelet function assay using microfluidic system. In this study, we investigated effects of several micro-stirrers which had different contact areas to blood. The degree of platelet activation was estimated by calculating area of aggregated platelets in the microscope images. Shapes of stirrers vary from simple bar to rectangle. The experimental results yielded that platelet activation is strongly dependent on shearing time and contact area of stirrer. Time for full platelet activation decreased from 180sec to only 10sec with enlarged area of the stirrers. This dramatic decrease of the time for maximum activation of platelets could be useful for easy and rapid platelet function test.
최세환(Seawhan Choi),이호윤(Hoyoon Lee),김계휴(Gyehue Kim),신세현(Sehyun Shin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
A stirring microchip system had been introduced as a novel way to activate platelets in blood sample. The microchip system consists of a stirring bar, sample chamber and magnetic rotation mechanism. We hypothesized that red blood cell (RBC) aggregation was affected by applied shear stress, which might activate platelets. For experiments, both negative blood sample not including platelets and whole blood were prepared. After injecting 10μl volume of whole blood, or negative sample to a microchip (RSA-C01, RHEO Meditech), the intensity of the light being transmitted through the microchip was measured. To explore whether platelet activation affects RBC aggregation, we exposed blood samples to different magnitudes of shear stress with various shearing time. We set the rotational speed of the stirrer to be 1000rpm, 1800rpm, 2800rpm, and 3800rpm. Also, the stirring time was varied with 10sec, 30sec, 60sec, 120sec, and 180sec. While the rotational speed increased, we observed RBC aggregation index (AI) of whole blood to be increased up to 30% (p< 0.05). In contrast, negative blood sample excluding platelets did not show any obvious changes. We expect that the curve of intensity transmitted might be a new predictable indicator of RBC aggregation associated with shear-induced platelet aggregation.