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A highly sensitive and stress-direction-recognizing asterisk-shaped carbon nanotube strain sensor
Choi, Giheon,Jang, Hayeong,Oh, Seungtaek,Cho, Hyewon,Yoo, Heemang,Kang, Hyun-Il,Choi, Yoonseuk,Kim, Se Hyun,Lee, Hwa Sung The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.31
<P>Flexible strain sensors are recognized as a key component of electronic-skin technology. One of the important features for strain sensors is that they should be able to sensitively recognize the direction of the external stress to accurately detect the various motions of humans or matter. Herein, we successfully developed a directionally responsive piezoresistive strain sensor with asterisk-shaped CNT sensing electrodes to recognize the direction of an applied external stress, thereby overcoming some of the shortcomings of established sensors. Under 5% strain, the change in relative resistance of the sensor developed here differed by up to a factor of 24.5 for different orientations of the sensor electrode relative to the source of the stress, <I>i.e.</I>, a high angular dependence of the sensing performance on the external stress direction was observed. In particular, the asterisk-shaped CNT strain sensors showed a super-linear relationship between response and strain for low strains of up to 5%, allowing them to provide a good sensing platform for recognizing micro-deformations. Finally, we demonstrated that our sensor could recognize the direction of the movement of an applied brush and the magnitude and direction of the tilt of a home-built joystick attached onto the sensor device.</P>
Clinical Characteristics of Community-Acquired Viridans Streptococcal Pneumonia
Choi, Sun Ha,Cha, Seung-Ick,Choi, Keum-Ju,Lim, Jae-Kwang,Seo, Hyewon,Yoo, Seung-Soo,Lee, Jaehee,Lee, Shin-Yup,Kim, Chang-Ho,Park, Jae-Yong The Korean Academy of Tuberculosis and Respiratory 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Background: Viridans streptococci (VS) are a large group of streptococcal bacteria that are causative agents of community-acquired respiratory tract infection. However, data regarding their clinical characteristics are limited. The purpose of the present study was to investigate the clinical and radiologic features of community-acquired pneumonia (CAP) with or without parapneumonic effusion caused by VS. Methods: Of 455 consecutive CAP patients with or without parapneumonic effusion, VS were isolated from the blood or pleural fluid in 27 (VS group, 5.9%) patients. Streptococcus pneumoniae was identified as a single etiologic agent in 70 (control group) patients. We compared various clinical parameters between the VS group and the control group. Results: In univariate analysis, the VS group was characterized by more frequent complicated parapneumonic effusion or empyema and bed-ridden status, lower incidences of productive cough, elevated procalcitonin (>0.5 ng/mL), lower age-adjusted Charlson comorbidity index score, and more frequent ground glass opacity (GGO) or consolidation on computed tomography (CT) scans. Multivariate analysis demonstrated that complicated parapneumonic effusion or empyema, productive cough, bed-ridden status, and GGO or consolidation on CT scans were independent predictors of community-acquired respiratory tract infection caused by VS. Conclusion: CAP caused by VS commonly presents as complicated parapneumonic effusion or empyema. It is characterized by less frequent productive cough, more frequent bed-ridden status, and less common CT pulmonary parenchymal lesions. However, its treatment outcome and clinical course are similar to those of pneumococcal pneumonia.
CONSUMER CHOICE BETWEEN BRAND-CAUSE FIT AND CONSUMER-CAUSE FIT IN CAUSE-RELATED MARKETING
Hyewon Choi,Junyong Kim 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7
As cause-related marketing (CRM) is becoming an increasingly integral part of corporate social responsibility activities and promotion plans, many researchers have studied what determines the effectiveness of cause-related marketing activities. One of the factors past research paid much attention to in this regard is the fit between the brand and cause. Previous studies have demonstrated that a high brand-cause fit generally improves consumer attitude toward company, increases purchase intent and brand loyalty. However, few recent studies show that a high brand-cause fit may backfire in some circumstances. This research aims to investigate when and why a high brand-cause fit backfires. In this regard, this research focuses on the role of important but understudied concept of consumer-cause fit. Based on a multi-dimensional perspective of self-concept (Sirgy,1982), this research defines and measures consumer-cause fit with respect to multiple dimensions of a consumer’s self-concept. Then, a series of experiments shows how the congruence between images of a cause, a consumer’s ideal and actual self-concept, and images of a brand will interact to moderate, in some cases even reverse, the relationship between brand-cause fit and consumer responses to a cause-related marketing campaign.