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Kim, Bori,Park, Youn Duk,Min, Kyoungho,Lee, Jin Hong,Hwang, Seung Sang,Hong, Soon Man,Kim, Bong Hoon,Kim, Sang Ouk,Koo, Chong Min WILEY‐VCH Verlag 2011 Advanced Functional Materials Vol.21 No.17
<P>Without any contact with electrodes, nanostructured elastomers can electrically actuate, as reported by Sang Ouk Kim, Chong Min Koo, and co‐workers on page 3242. The cover image illustrates the electric actuation of nanostructured materials, dominated by a true electrostriction mechanism. The degree of surface polarization on the interface between mismatched dielectrics is expressed by the surface color of the dispersion phases. </P>
Kim, Bori,Park, Younduk,Kim, Jungahn,Hong, Soon Man,Koo, Chong Min Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science. Part B, Polymer physic Vol.48 No.22
<P>The true electric actuation thickness strain of poly (styrene-b-ethylbutylene-b-styrene) (SEBS) gel was measured using an in situ synchrotron SAXS. The thermoplastic elastomer SEBS gel was microphase-separated to form a disordered styrene micelle nanostructure in an oil-swollen ethylbutylene matrix. The SEBS gel showed reversible cyclic load–unload compression behavior without permanent residual strain. The electromechanical strain of the SEBS gel with carbon paste electrodes could be evaluated by means of a nanostructure dimensional change traced by using the in situ synchrotron SAXS during actuation. The strain measured with SAXS was compared with the strain measured using conventional laser displacement sensor systems. The optical laser sensor method was likely to overestimate the thickness strain due to the bending movement of the dielectric elastomer. To our knowledge, the thickness strain value measured by the synchrotron SAXS is the closest to the true strain ever measured in the field of dielectric elastomer studies, because the nanostructure dimensional change depends on the thickness dimension change, not on the translational movement like the bending motion. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2010</P>
Analysis of Blood Flow-dependent Blood Nitric Oxide Level and Half-life of Nitric Oxide in Vivo
Kim Cuk-Seong,Kim Hyo-Shin,Lee Young-Jun,Park Jin Bory,Ryoo Sung-Woo,Chang Seok-Jang,Jeon Byeong-Hwa Biomedical Engineering Society for Circulation 2003 International Journal of Vascular Biomedical Engin Vol.1 No.2
Endothelial release of nitric oxide (NO) contributes to the regulation of vascular tone by inducing vascular relaxation. To estimate the blood flow-dependent nitric oxide level and half-life (T1/2) of nitric oxide in vivo state, we investigated the change of aortic NO currents during the change of aortic blood flow rate using NO-selective electrode system and electromagnetic flowmeter in the aorta of anesthetized rats. Resting mean aortic blood flow rate was $49.6{\pm}5.6ml/min$ in the anesthetized rats. NO currents in the aorta were increased by the elevation of blood pressure and/or blood flow rate. When the aortic blood flow was occluded by the clamping, aortic NO currents were decreased. The difference of NO concentration between resting state and occluded state was $1.34{\pm}0.26{\mu}M$ (n=7). This NO concentration was estimated as blood flow-dependent nitric oxide concentration in the rats. Also, while the aortic blood flow was occluded, NO currents were decreased with exponential pattern with $12.84{\pm}2.15$ seconds of time constant and $7.70{\pm}1.07$ seconds of half-life. To summarize, this study suggested that blood flow-dependent NO concentration and half-life of nitric oxide were about $1.3{\mu}M$ and 7.7 seconds, respectively, in the aorta of anesthetized rats. The nitric oxide-selective electrode system is useful for the direct and continuous measurement of NO in vivo state.
추상적 인터페이스를 활용한 카메라-스크린 사이의 인터랙션 방법론
김지연(Jiyun Kim),김호남(Honam Kim),차보리(Bori Cha),이현진(Hyun Jean Lee) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
박물관, 과학관, 미술관 등에서 실시간 카메라와 스크린을 매개로 체험자와 스크린 사이의 인터랙션 방법론을 활용하는 체험형 콘텐츠가 다양하게 등장하고 있다. 이러한 콘텐츠에서 체험자 역시 스크린 위에 움직이고 반응하는 대상물로서 등장하는 경우가 많으며, 체험자는 스크린 위의 자신의 모습을 보며 보다 적극적으로 상호작용적 작업에 참여하게 된다. 하지만 때때로 체험자가 자신의 모습에 지나치게 몰입하는 경우, 콘텐츠의 상호작용적 의미를 미처 파악하지 못하고 단순한 체험만으로 작품에 개입하는 한계점을 지닐 수도 있다. 본 연구는 체험자의 능동적 참여를 유도하되, 지나친 나르시시즘적 몰입을 극복할 수 있는 추상적 인터페이스로 접근한 인터랙션 방법론을 제안하고자 한다. 이는 스크린을 매개로 한 인터랙티브 수 · 과학 게임 콘텐츠 프로토타입인 〈Move Us〉를 통해 제안된다.〈Move Us〉에 적용된 추상적 인터페이스는 추상적 레벨을 심화시켜 새로운 인터페이스로서의 가능성을 제시할 뿐만 아니라, 재미와 몰입을 유도하는 동시에 학습 정보에 대한 이해도를 높여주는데 역할 한다.
Yoon, Sujung,Kim, Jieun E,Hwang, Jaeuk,Kang, Ilhyang,Jeon, Saerom,Im, Jooyeon J,Kim, Bori R,Lee, Sunho,Kim, Geon Ha,Rhim, Hyewhon,Lim, Soo Mee,Lyoo, In Kyoon American College of Neuropsychopharmacology 2017 Neuropsychopharmacology Vol.42 No.2
<P>The neural mechanisms underlying the development and maintenance of posttraumatic stress disorder (PTSD) have long been studied. However, little is known about the neural correlates of the recovery process from PTSD. A 5-year longitudinal study was conducted to investigate the trajectory of structural connectivities of the amygdala in disaster survivors with PTSD. Thirty disaster survivors, who were diagnosed with PTSD, and 29 healthy individuals, who were not exposed to trauma, underwent three waves of assessments including neuroimaging scanning over a 5-year period from the time of the disaster at approximately 1.3-year intervals. All disaster survivors showed significant improvements in PTSD symptoms over time. Using diffusion tensor imaging analysis, a 5-year trajectory of amygdalar structural connectivities with key brain regions was assessed. The amygdala insula connection was initially strengthened and then normalized during recovery, while the amygdala prefrontal cortex (PFC) connection was at first unaffected, then strengthened, and eventually normalized. The lower tract strength of the amygdala thalamus connection normalized during recovery, while that of amygdala hippocampus connection remained low. The greater amygdala PFC connectivity was associated with less PTSD symptom severity. The present longitudinal study revealed that recovery from PTSD parallels dynamic and sequential shifts in amygdalar connectivities with multiple brain regions, suggesting the expanded view of fear circuitry including the insula and-thalamus, beyond the traditional model which primarily involves the amygdala, PFC, and hippocampus.</P>
체외막형 산화기를 시행한 심장내과 중환자실 입원 환자의 경장영양 지원: 관찰 연구
김성혜 ( Sung Hye Kim ),신윤진 ( Yoonjin Shin ),라미용 ( Mi Yong Rha ),조영연 ( Young Yun Cho ),양정훈 ( Jeong Hoon Yang ),조양현 ( Yang-hyun Cho ),서지영 ( Ji Young Seo ),강보리 ( Bori Kang ),김양하 ( Yangha Kim ) 한국정맥경장영양학회 2016 한국정맥경장영양학회지 Vol.8 No.3
Purpose: Enteral feeding remains controversial in patients receiving extracorporeal membrane oxygenation (ECMO), particularly in those treated with a high-dose vasopressor. This study examined the safety and feasibility of enteral nutritional support for patients undergoing ECMO in a cardiac care unit (CCU). Methods: Adult patients admitted to the CCU undergoing ECMO from January 2014 to May 2015 were included. Patients with <48 hours of support, undergoing ECMO at another hospital, and inaccurate medical records were excluded. Results: Among the 14 patients undergoing ECMO in the CCU, 2 patients were diagnosed with malnutrition and the others were in the normal state in the initial assessment. On the other hand, they had the malnutrition risk factors (anorexia, weight loss, fluid retention, and hypermetabolic state). Thirteen patients received enteral nutrition and 1 patient had possible oral intake. The average initiation day of enteral nutrition was 2.0±1.6 days on ECMO. The mean duration of enteral nutrition was 5.2±4.9 days and the target goal was achieved within 3 days. There were no serious adverse effects for enteral nutrition but 3 patients had gastrointestinal problems (diarrhea and anorexia), and gastrointestinal bleeding occurred in 1 patient. In 1 case, enteral nutrition had to be stopped due to the prone position. Overall, 5 patients were cured, 3 patients recovered through heart transplantation, and 6 patients died. Conclusion: Most CCU patients receiving ECMO were well nourished but had the malnutrition risk factors in progress. These results suggest that enteral feeding might be safe and feasible in patients treated with ECMO but there were minor side effects.