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Yield shear stress and disaggregating shear stress of human blood
Jung, Jinmu,Lee, Byoung-Kwon,Shin, Sehyun 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.2
This review presents two distinct rheological parameters of blood that have the potential to indicate blood circulation adequacy: yield shear stress (YSS) and disaggregating shear stress (DSS). YSS and DSS reflect the strength of red blood cell (RBC) aggregation in suspension under static and dynamic conditions, respectively. YSS, defined as the critical stress to disperse RBC aggregates under static conditions, was found to be dependent upon hematocrit, fibrinogen, and red cell deformability, but not temperature. DSS, defined as the minimum shear stress to disperse RBC aggregates under dynamic conditions, is dependent upon fibrinogen, red cell deformability, and temperature but not hematocrit. Owing to recent advances in measurement technology, these two parameters can be easily measured, and thus, their clinical significance in blood circulation can be verified.
정민영 ( Minyoung Jung ),김덕진 ( Duk-jin Kim ),손홍규 ( Hong-gyoo Sohn ),최진무 ( Jinmu Choi ),임정호 ( Jungho Im ) 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.5
대규모 피해를 유발하는 재난의 발생 횟수가 증가하면서 효과적인 재난 대응 체계를 수립하여 국민의 안전 사회를 구현하기 위한 노력이 지속되고 있다. 재난에 의한 피해는 다양한 양상으로 발전할 수 있으므로 신속하고 정확한 대응 방안을 마련해야 하며, 이를 지원할 수 있는 유용한 기술로 원격탐사 기술과 GIS (Geographic Information System) 분석 기술에 관한 다양한 연구가 수행되고 있다. 본 특별호에서는 우주-항공-지상을 아우르는 다양한 시공간 도메인을 가진 원격탐사 센서를 이용한 재난 예측 및 감시 연구와 이로부터 취득된 정보와 기존의 공간정보를 융합한 GIS 재난관리에 관한 연구성과를 기술하였다. 소개된 기술은 풍수해, 산불 등 다양한 유형의 재난관리 기술로, 각 기술 간 연계를 통해 최근 필요성이 대두되고 있는 종합적 재난상황관리체계 구축이 가능할 것으로 기대된다. The need for an effective disaster management system has grown these days to protect public safety as the number of disasters causing massive damage increases. Since disaster-induced damage can develop in various ways, rapid and accurate countermeasures must be prepared soon after disasters occur. Numerous studies have continuously developed remote sensing and GIS (Geographic Information System)-based techniques for disaster monitoring and damage analysis. This special issue presents the research results on disaster prediction and monitoring based on various remote sensors on different platforms from ground to space and disaster management using GIS techniques. The developed techniques help manage various disasters such as storms, floods, and forest fires and can be combined to achieve an integrated and effective disaster management system.
Free-Standing Polyimide Nanotips on Substrates for Preparation of Hollow TiO2 Nanotips.
Jeon, Gumhye,Jung, Jinmu,Lee, Seunghyun,Seong, Keum-Yong,Hwang, Dae Youn,Kwon, Hyeog Soong,Kim, Byoung Chul,Kim, Joo Man,Kim, Jin Kon,Yang, Seung Yun American Scientific Publishers 2015 Journal of nanoscience and nanotechnology Vol.15 No.7
<P>We report a facile method to fabricate free-standing polyimide (PI) nanotips on substrates by using plasma treatment with oxygen gas. The PI nanotips were prepared from the self-organization of unetchable materials deposited on a PI film during the plasma treatment. This approach provides a single-step process for the preparation of polymer nanotips in a large area (>inch scale). Furthermore, a selective patterning of the PI nanotips in a specific area was achieved by using a shadow mask. Due to excellent thermal resistance of PI, the PI nanotips maintained structural integrity at high temperature (~ 300 °C). To demonstrate potential application of PI nanotips as a template for hollow nanostructures, hollow TiO2 nanotips were prepared after atomic layer deposition of TiO2 followed by the burning of PI layer.</P>
격자망(30cm * 30cm) 경로 제작을 통한 설계도면 데이터의 3차원 대피경로 분석
함정수(Ham, Jung Soo),최진무(Choi, Jinmu) 한국측량학회 2021 한국측량학회 학술대회자료집 Vol.2021 No.11
실내공간 경로의 모델링 및 분석은 다양한 분야에서 활용된다. 하지만 3차원 모델링 작업에는 많은 시간과 비용이 소요되기 때문에 모든 건물에 3차원 모델링을 적용하는 것은 한계가 있다. 따라서 본 연구는 시간과 비용의 절약을 위해 설계도면 데이터(.dwg)를 이용하여 격자망(30cm * 30cm)을 기반으로 건물 내부 대피경로를 정보를 구축하는 방법을 제시하고자 하였다. 연구에 사용된 데이터는 킨텍스 제1전시장이며, 연구방법은 각 층별 격자망을 생성, 계단으로 속성을 연결하였으며, 최근린 시설 분석을 이용해 네트워크 분석을 진행하였다. 연구내용으로 통행가능속성과 통행불가능 속성을 추출하였고, 킨텍스 중회의실 308호에서 화재가 발생함을 가정하여 분석을 진행하였다. 연구결과, 입력자의 위치부터 출입구까지의 대피경로가 분석되었으며, 총 경로의 길이는 225m, 분석시간은 1분 미만이었다. 본 연구를 통해 간단한 방법으로 3차원 네트워크를 구축할 수 있으며, 신속하고 효율적인 대피경로의 분석이 가능함을 확인하였다.
Lee, Ui Yun,Jung, Jinmu,Kwak, Hyo Sung,Lee, Dong Hwan,Chung, Gyung Ho,Park, Jung Soo,Koh, Eun Jeong The Korean Neurosurgical Society 2019 Journal of Korean neurosurgical society Vol.62 No.2
Objective : The objective of this study was to analyze patient-specific blood flow in ruptured aneurysms using obtained non-Newtonian viscosity and to observe associated hemodynamic features and morphological effects. Methods : Five patients with acute subarachnoid hemorrhage caused by ruptured posterior communicating artery aneurysms were included in the study. Patients' blood samples were measured immediately after enrollment. Computational fluid dynamics (CFD) was conducted to evaluate viscosity distributions and wall shear stress (WSS) distributions using a patient-specific geometric model and shear-thinning viscosity properties. Results : Substantial viscosity change was found at the dome of the aneurysms studied when applying non-Newtonian blood viscosity measured at peak-systole and end-diastole. The maximal WSS of the non-Newtonian model on an aneurysm at peak-systole was approximately 16% lower compared to Newtonian fluid, and most of the hemodynamic features of Newtonian flow at the aneurysms were higher, except for minimal WSS value. However, the differences between the Newtonian and non-Newtonian flow were not statistically significant. Rupture point of an aneurysm showed low WSS regardless of Newtonian or non-Newtonian CFD analyses. Conclusion : By using measured non-Newtonian viscosity and geometry on patient-specific CFD analysis, morphologic differences in hemodynamic features, such as changes in whole blood viscosity and WSS, were observed. Therefore, measured non-Newtonian viscosity might be possibly useful to obtain patient-specific hemodynamic and morphologic result.
Lee, Ui Yun,Jung, Jinmu,Kwak, Hyo Sung,Lee, Dong Hwan,Chung, Gyung Ho,Park, Jung Soo,Koh, Eun Jeong The Korean Neurosurgical Society 2018 Journal of Korean neurosurgical society Vol.61 No.6
Objective : The goal of this study was to compare several parameters, including wall shear stress (WSS) and flow pattern, between unruptured and ruptured anterior communicating artery (ACoA) aneurysms using patient-specific aneurysm geometry. Methods : In total, 18 unruptured and 24 ruptured aneurysms were analyzed using computational fluid dynamics (CFD) models. Minimal, average, and maximal wall shear stress were calculated based on CFD simulations. Aneurysm height, ostium diameter, aspect ratio, and area of aneurysm were measured. Aneurysms were classified according to flow complexity (simple or complex) and inflow jet (concentrated or diffused). Statistical analyses were performed to ascertain differences between the aneurysm groups. Results : Average wall shear stress of the ruptured group was greater than that of the unruptured group (9.42% for aneurysm and 10.38% for ostium). The average area of ruptured aneurysms was 31.22% larger than unruptured aneurysms. Simple flow was observed in 14 of 18 (78%) unruptured aneurysms, while all ruptured aneurysms had complex flow (p<0.001). Ruptured aneurysms were more likely to have a concentrated inflow jet (63%), while unruptured aneurysms predominantly had a diffused inflow jet (83%, p=0.004). Conclusion : Ruptured aneurysms tended to have a larger geometric size and greater WSS compared to unruptured aneurysms, but the difference was not statistically significant. Flow complexity and inflow jet were significantly different between unruptured and ruptured ACoA aneurysms.