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이용자 만족도에 영향을 미치는 수변형 생태공원 계획요소 규명 - 경인 아라뱃길 두물머리 생태공원을 대상으로 -
윤상훈(Yoon, Sanghoon),박재영(Park, Jaeyoung) 인천연구원 2015 도시연구 Vol.- No.9
본 연구는 경인 아라뱃길의 수변형 생태공원을 대상으로 이용자 만족도에 영향을 미칠 수 있는 계획요소를 규명하고자 하였다. 수변형 생태공원은 수변공간과 생태공원이 결합된 형태로 새롭게 연구되고 있는 공원의 형태이다. 분석방법으로는 계획요소가 많은 만큼 다중공선성에 대한 문제를 해결하기 위해 전통적인 다중회귀분석이 아닌 PLS회귀분석을 활용하였다. 분석결과, 수변형 생태공원의 이용만족도에 가장 큰 영향을 미치는 계획요소는 사람들간의 교류공간(커뮤니티 공간)(VIP값 : 1.242)인 것으로 나타났다. 또한, 생태공원으로의 접근편리성(1.138), 생태습지의 원래대로의 보전정도(1.108), 수변의 다양한 형태(1.051), 안내시설(1.036), 다양한 동식물 서식환경 제공·보호(1.025), 훼손된 생태계의 재생 및 복원(1.016), 생태공간들간의 접근성(1.007)순으로 VIP값이 1.0이상-1.2미만으로 중요하게 영향을 미치는 변수로 도출되었다. 본 연구의 결과, 향후 수변형 생태공원의 이용자 만족도를 높이기 위해서는 생태적 계획요소의 적절한 활용과 함께 이용자들의 교류 활성화 및 커뮤니티 의식 제고를 위한 공간조성이 중요하며, 생태공원으로의 접근편리성과 안내시설 등과 같은 기본적인 시설 및 정보도 제공되어야함을 시사해주고 있다. The main purpose of this research is to examine planning factors which can be influential to the satisfaction of visitors with a case study of Kyungin Arabetgil Dumulmeori waterfront eco-park. Waterfront ecological park is a new type of park where waterfront area and ecopark are combined. There are many planning factors that would cause multicollinearity. So the research method was selected PLS regression analysis instead of typical multiple regression analysis. According to the result, the most influential factor in the satisfaction of the service users of the waterfront eco-park is community spaces which visitors are able to communicate each other (VIP rate: 1.242). Other important influential variables are as follows: easy to access (1.138), natural integrity condition as an ecological wetland (1.108), various waterfronts (1.051), guide facilities and information boards (1.036), good inhabiting environment for animals and plantsㆍecosystem protection (1.025) regeneration and restoration of the damaged ecosystem (1.016), accessibility between ecological spaces (1.007). Therefore, it is essential to apply ecological planning factors for improving satisfaction of visitors. It is also important to create some spaces to raising community awareness and park users interaction. Moreover those results suggest that it has to provide well presented basic facilities with easy accessibility and good guide information.
Polymeric nano-shielded islets with heparin-polyethylene glycol in a non-human primate model
Park, Hyojun,Haque, Muhammad R.,Park, Jae Berm,Lee, Kyo Won,Lee, Sanghoon,Kwon, Yeongbeen,Lee, Han Sin,Kim, Geun-Soo,Shin, Du Yeon,Jin, Sang-Man,Kim, Jae Hyeon,Kang, Hee Jung,Byun, Youngro,Kim, Sung J Elsevier 2018 Biomaterials Vol.171 No.-
<P><B>Abstract</B></P> <P>Intraportal pancreatic islet transplantation incurs huge cell losses during its early stages due to instant blood-mediated inflammatory reactions (IBMIRs), which may also drive regulation of the adaptive immune system. Therefore, a method that evades IBMIR will improve clinical islet transplantation. We used a layer-by-layer approach to shield non-human primate (NHP) islets with polyethylene glycol (nano-shielded islets, NSIs) and polyethylene glycol plus heparin (heparin nano-shielded islets; HNSIs). Islets ranging from 10,000 to 20,000 IEQ/kg body weight were transplanted into 19 cynomolgus monkeys (n = 4, control; n = 5, NSI; and n = 10, HNSI). The mean C-peptide positive graft survival times were 68.5, 64 and 108 days for the control, NSI and HNSI groups, respectively (<I>P</I> = 0.012). HNSI also reduced the factors responsible for IBMIR <I>in vitro</I>. Based on these data, HNSIs in conjunction with clinically established immunosuppressive drug regimens will result in superior outcomes compared to those achieved with the current protocol for clinical islet transplantation.</P>
Development of a Multi-nozzle Bioprinting System for 3D Tissue Structure Fabrication
Sanghoon Park,Seongjun Kim,Jaesoon Choi 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The aim of this study was to develop a multi-nozzle based bioprinting system for fabrication of threedimensional (3D) biological structure. In this study, a thermoplastic biomaterial that has relatively high mechanical stability, polycaprolactone (PCL), was used to make the 3D structure. A multi-nozzle bioprinting system was designed to dispense thermoplastic biomaterial and hydrogel simultaneously. The system consists of three axes of x-y-z motion control stage and 1-axis actuator for change of nozzle. The controllability of the printed line width was tested as a representative performance index.
Effect of grain boundaries on electrical properties of polycrystalline graphene
Park, Sanghoon,Shehzad, Muhammad Arslan,Khan, Muhammad Farooq,Nazir, Ghazanfar,Eom, Jonghwa,Noh, Hwayong,Seo, Yongho Elsevier 2017 Carbon Vol.112 No.-
<P>Since it was discovered, synthesizing large area graphene sheets by chemical or epitaxial methods is the conventional method for the application of graphene's outstanding properties. Unfortunately, CVD grown graphene is polycrystalline in nature with grain boundaries (GBs) unlike exfoliated single crystal graphene flakes. These GBs are known as the main source of degrading mechanical, chemical and electrical properties of CVD graphene. Nematic liquid crystal was employed to visualize grains and boundaries and to calculate the atomic orientation of adjacent grains. Electrical performance of various GB devices was observed, and the role of grain boundaries on the ultimate electrical performance was investigated. The same work was carried out at low temperature (similar to 7 K) to minimize the perturbation of two-dimensional electron which originated from the graphene lattice vibration. Interestingly, it was observed that there was no significant effect of the grain boundaries on the overall electrical performance of devices even at low temperature. These results lead to the conclusion that the grain boundaries in polycrystalline graphene sheets are not the cause for degradation in the electrical performance, if the grains were stitched well at the boundary in the growth process. (C) 2016 Elsevier Ltd. All rights reserved.</P>