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RISS 인기검색어
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- 저자 : Kevin K. Yang (검색결과 3 건)
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Shear Adhesion of Tapered Nanopillar Arrays
Cho, Younghyun,Minsky, Helen K.,Jiang, Yijie,Yin, Kaiyang,Turner, Kevin T.,Yang, Shu American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.13
<P>Tapered nanopillars with various cross sections, including cone-shaped, stepwise, and pencil-like structures (300 nm in diameter at the base of the pillars and 1.1 μm in height), are prepared from epoxy resin templated by nanoporous anodic aluminum oxide (AAO) membranes. The effect of pillar geometry on the shear adhesion behavior of these nanopillar arrays is investigated via sliding experiments in a nanoindentation system. In a previous study of arrays with the same geometry, it was shown that cone-shaped nanopillars exhibit the highest adhesion under normal loading while stepwise and pencil-like nanopillars exhibit lower normal adhesion strength due to significant deformation of the pillars that occurs with increasing indentation depth. Contrary to the previous studies, here, we show that pencil-like nanopillars exhibit the highest shear adhesion strength at all indentation depths among three types of nanopillar arrays and that the shear adhesion increases with greater indentation depth due to the higher bending stiffness and closer packing of the pencil-like nanopillar array. Finite element simulations are used to elucidate the deformation of the pillars during the sliding experiments and agree with the nanoindentation-based sliding measurements. The experiments and finite element simulations together demonstrate that the shape of the nanopillars plays a key role in shear adhesion and that the mechanism is quite different from that of adhesion under normal loading.</P> [FIG OMISSION]</BR>
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Robot-assisted distal ureteral reconstruction for benign pathology: Current state
Aeen M. Asghar,Randall A. Lee,Kevin K. Yang,Michael Metro,Daniel D. Eun 대한비뇨의학회 2020 Investigative and Clinical Urology Vol.61 No.-
Distal ureteral reconstruction for benign pathologies such as stricture disease or iatrogenic injury has posed a challenge for urologist as endoscopic procedures have poor long-term outcomes, requiring definitive open reconstruction. Over the past decade, there has been an increasing shift towards robot-assisted laparoscopy (RAL) with multiple institutions reporting their outcomes. In this article, we reviewed the current literature on RAL distal ureteral reconstruction, focusing on benign pathologies only. We present peri-operative data and outcomes on the most common technique, ureteral reimplantation, as well as adjunct procedures such as psoas hitch and Boari flap. Additionally, we present alternative techniques reported in the literature with some technical considerations. Lastly, we describe the outcomes of the comparative studies between open, laparoscopy, and RAL. Although the body of literature in this field is limited, RAL reconstruction of the distal ureter appears to be safe, feasible, and with some advantages over the traditional open approach.
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아이젠의 계획행동이론과 쿠더의 수정계획행동모형 비교분석
장지영(Ji Young Jang),최양호(Yang Ho Choi),변케빈(Kevin K Byon),미디어로마도나(Romadona),김정현(Jung Hyun Kim) 한국광고홍보학회 2013 한국광고홍보학보 Vol.15 No.1
한국의 경우 대부분의 대학생들이 대학 생활에 대한 기대 및 선후배, 친구들과의 관계유지를 위하여 상당히 심한 음주 압력을 받아 지나친 음주 행위를 하게 될 위험에 처해있다. 이에 이 연구는 Ajzen의 계획행동이론과 Kuther의 수정계획행동모형을 비교 분석하여 대학생들의 음주 행위를 설명해 보고자 했다. 연구 결과 두 모델 모두의 경우 지각된 행위 통제(perceived behavioral control) 요인이 음주 행동을 가장 잘 예측해 주는 요인으로 나타났다. 그러나 계획행동이론의 경우 주관적 규범이 음주 의도 및 실제 음주 행위에 영향을 미치지 못한 반면, 수정계획행동모형에서는 부모/동료 규범과 음주 행동이 직·간접적으로 음주 행위에 유의미한 영향을 미치는 것으로 나타났다. 특히, 대학생들의 음주 행위를 설명하는 데 수정계획행동모형은 주관적 규범을 부모와 동료 규범으로, 그리고 일반적 태도를 구체적 태도로 구체화하여 계획행동모형을 보완해 줄 수 있는 모형이라고 할 수 있다. In Korea, college students` expectations of student life and need to be part of society and alumni networks have considerable influence on their alcohol consumption. Thus, they may be at risk of excessive and sustained drinking behaviors. This study employs the theory of planned behavior(TPB) and Kuther`s revised TPB to examine alcohol consumption of college students in Korea. The results indicate that perceived behavioral control(PBC) is an important factor in the prediction of drinking behavior for the TPB and the revised TPB. For Ajzen`s TPB, subjective norms had no effects on drinking intentions and actual drinking behavior, whereas for Kuther`s revised TPB, parental/peer norms and behaviors had significant effects on drinking behavior both directly and indirectly. For Kuther`s revised TPB, negative expectancies had significant effects on drinking behavior through PBC. In conclusion, Kuther`s revised TPB model could complement TPB by collapsing its subjective norms into peers and family members and specifying attitude construct in the context of alcohol consumption behavior among college students in Korea.
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