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Effect of low frequency motion on the performance of a dynamic manual tracking task
Melissa D. Burton,Kenny C.S. Kwok,Peter A. Hitchcock 한국풍공학회 2011 Wind and Structures, An International Journal (WAS Vol.14 No.6
The assessment of wind-induced motion plays an important role in the development and design of the majority of today’s structures that push the limits of engineering knowledge. A vital part of the design is the prediction of wind-induced tall building motion and the assessment of its effects on occupant comfort. Little of the research that has led to the development of the various international standards for occupant comfort criteria have considered the effects of the low-frequency motion on task performance and interference with building occupants’ daily activities. It has only recently become more widely recognized that it is no longer reasonable to assume that the level of motion that a tall building undergoes in a windstorm will fall below an occupants’ level of perception and little is known about how this motion perception could also impact on task performance. Experimental research was conducted to evaluate the performance of individuals engaged in a manual tracking task while subjected to low level vibration in the frequency range of 0.125 Hz-0.50 Hz. The investigations were carried out under narrowband random vibration with accelerations ranging from 2 milli-g to 30 milli-g (where 1 milli-g = 0.0098 m/s^2) and included a control condition. The frequencies and accelerations simulated are representative of the level of motion expected to occur in a tall building (heights in the range of 100 m -350 m) once every few months to once every few years. Performance of the test subjects with and without vibration was determined for 15 separate test conditions and evaluated in terms of time taken to complete a task and accuracy per trial. Overall, the performance under the vibration conditions did not vary significantly from that of the control condition, nor was there a statistically significant degradation or improvement trend in performance ability as a function of increasing frequency or acceleration.
Smart body armor inspired by flow in bone
Melissa Louise Knothe Tate 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.7 No.3
An understanding of biomaterials’ smart properties and how biocomposite materials are manufactured by cells provides not only bio-inspiration for new classes of smart actuators and sensors but also foundational technology for smart materials and their manufacture. In this case study, I examine the unique smart properties of bone, which are evident at multiple length scales and how they provide inspiration for novel classes of mechanoactive materials. I then review potential approaches to engineer and manufacture bioinspired smart materials that can be applied to solve currently intractable problems such as the need for “smart” body armor or decor cum personal safety devices.
Melissa Rubio dos Santos 한국라틴아메리카학회 2020 라틴아메리카연구 Vol.33 No.1
This article aims to discuss teaching and learning process of Portuguese as an additional language, taught through project-based learning for Korean students in higher education. For this article I propose the presentation and discussion of project-based learning developed for the Portuguese Audio Visual, Portuguese Media and Conversation Portuguese Advanced II classes, which were targeted at an audience of students at the intermediate, upper intermediate and advanced levels in the Portuguese-Brazilian Studies Department, College of Foreign Languages, at Dankook University in 2018 and 2019. The teaching and learning experience reported in this article was carried out from teaching projects which were organized in didactic units with the main objective of promoting the literacy of South Korean students in Portuguese as additional language. For this discussion, the teaching projects carried out in the Portuguese classes had as theoretical support the study of language based on two guiding concepts: speech genres by Mikhail Bakhtin (2003) and literacy by Margarete Schlatter (2009).
A rare complication of capsule endoscopy, retained in diverticula: A report of two cases
Melissa Kyriakos Saad,Elias Fiani,Imad El Hajj,Elias Saikaly 소화기인터벤션의학회 2021 Gastrointestinal Intervention Vol.10 No.1
Capsule endoscopy is being widely used to identify the origin of an obscure gastrointestinal bleeding. Capsule retention is one of its complications. Herein, we present 2 cases of a retained capsule one in a gastric diverticula that was managed endoscopically, and one in jejunal diverticula managed by small bowel resection.
Altered potassium ATP channel signaling in mesenteric arteries of old high salt-fed rats
Melissa A Whidden,Bilgen Basgut,Nataliya Kirichenko,Benedek Erdos,Nihal Tumer 한국운동영양학회 2016 Physical Activity and Nutrition (Phys Act Nutr) Vol.20 No.2
Purpose: Both aging and the consumption of a high salt diet are associated with clear changes in the vascular system that can lead to the development of cardiovascular disease; however the mechanisms are not clearly understood. Therefore, we examined whether aging and the consumption of excess salt alters the function of potassium ATP-dependent channel signaling in mesenteric arteries. Methods: Young (7 months) and old (29 months) Fischer 344 x Brown Norway rats were fed a control or a high salt diet (8% NaCl) for 12 days and mesenteric arteries were utilized for vascular reactivity measurements. Results: Acetylcholine-induced endothelium relaxation was significantly reduced in old arteries (81 ± 4%) when compared with young arteries (92 ± 2%). Pretreatment with the potassium-ATP channel blocker glibenclamide reduced relaxation to acetylcholine in young arteries but did not alter dilation in old arteries. On a high salt diet, endothelium dilation to acetylcholine was significantly reduced in old salt arteries (60 ± 3%) when compared with old control arteries (81 ± 4%). Glibenclamide reduced acetylcholine-induced dilation in young salt arteries but had no effect on old salt arteries. Dilation to cromakalim, a potassium-ATP channel opener, was reduced in old salt arteries when compared with old control arteries. Conclusions: These findings demonstrate that aging impairs endothelium-dependent relaxation in mesenteric arteries. Furthermore, a high salt diet alters the function of potassium-ATP-dependent channel signaling in old isolated mesenteric arteries and affects the mediation of relaxation stimuli.
Melissa Rubio dos Santos 한국외국어대학교 중남미연구소 2020 중남미연구 Vol.39 No.1
This article aims to explore a case study about Korean Dramas in Korean-Brazil cross-cultural and intercontinental context. Focusing on Gender issues such as constructions and representations in contemporary narratives in cultural movement Hallyu (Korean Wave) this study intends to problematize gender departing from readings of female Latin American audience, specifically Brazilian female audience. In order to better understand perceptions about gender in Korean drama, this study will trace some driving questions: 1. What are power relations and how they permeate representations of women in Korea over centuries? 2. Considering subversion, recognition, and construction of gender equality by contemporary women in Korea how gender equality in South Korea has been developed? 3. How Hallyu media promotes a critical reading about gender in Latin America and Brazil? First, this study proposes mapping gender representations on K-dramas "Age of Youth (청춘시대)-seasons 1 and 2" (JTBC, 2016/2017) and "Hospital Ship (병원선) (MBC, 2017). Secondly, discuss the readings by female Brazilian audience about gender representation portrayed in Korean dramas. This research will be carried out from theoretical works of the, Social Sciences, Media Studies, Hallyu Studies and Gender Studies.