• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.173-174
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• 2006

Understanding chondrocyte behavior inside complex, three-dimensional environments with controlled patterning of geometrical factors would provide significant insights into the basic biology of tissue regenerations. One of the fundamental limitations in studying such behavior has been the inability to fabricate controlled 3D structures. To overcome this problem, we have developed a three-dimensional microfabrication system. This system allows fabrication of predesigned internal architectures and pore size by stacking up the photopolymerized materials. Photopolymer SL5180 was used as the material for 3D scaffolds. The results demonstrate that controllable and reproducible inner-architecture can be fabricated. Chondrocytes harvested from human nasal septum were cultured in two kinds of 3D scaffolds to observe cell adhesion behavior. Such 3D scaffolds might provide effective key factors to study cell behavior in complex environments and could eventually lead to optimum design of scaffolds in various tissue regenerations such as cartilage, bone, etc. in a near future.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.28 no.1
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• pp.22-33
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• 2020

Due to recent increased air traffic,, air traffic controllers in charge of en-route and approach control have faced huge increase in both workload and its intensity. The purpose of this paper is to analyze how much safety culture of air traffic controllers has effect on their complexity mitigation strategies during their duties. It could be expected complexity mitigation improve air traffic flow resulting in enhancing safety eventually. According to empirical analysis against air traffic controllers in civil aviation and air force in South Korea, it was proven safety culture had a statistically positive effect on complex mitigation strategies through safety behavior. In safety culture among air traffic controllers, intrinsic culture had a positive effect on extrinsic value of safety culture. Intrinsic value of safety culture led to air traffic controllers' safety behavior which created work complexity mitigation strategies. Among work complexity mitigation strategies, communication and cooperation was proven to be the most important factor effected by safety culture and behavior. It was implied that enhancing the intrinsic values of safety culture would cause to improve extrinsic safety culture and air traffic controller's work efficiency.

• Structural Engineering and Mechanics
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• v.31 no.5
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• pp.545-566
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• 2009

Bridge columns are subjected to combined actions of axial force, shear force and bending moment during earthquakes, caused by spatially-complex earthquake motions, features of structural configurations and the interaction between input and response characteristics. Combined actions can have significant effects on the force and deformation capacity of RC columns, resulting in unexpected large deformations and extensive damage that in turn influences the performance of bridges as vital components of transportation systems. This paper evaluates the seismic response of three prototype reinforced concrete bridges using comprehensive numerical models that are capable of simulating the complex soil-structural interaction effects and nonlinear behavior of columns. An analytical approach that can capture the shear-flexural interacting behavior is developed to model the realistic nonlinear behavior of RC columns, including the pinching behavior, strength deterioration and stiffness softening due to combined actions of shear force, axial force and bending moment. Seismic response analyses were conducted on the prototype bridges under suites of ground motions. Response quantities of bridges (e.g., drift, acceleration, section force and section moment etc.) are compared and evaluated to identify the effects of vertical motion, structural characteristics and the shear-flexural interaction on seismic demand of bridges.

• Journal of Korean society of Dental Hygiene
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• v.21 no.5
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• pp.595-600
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• 2021

Objectives: For postmenopausal women who participated in the 2019 National Health and Nutrition Examination Survey, we aimed to provide basic data for oral health management interventions and oral policies for each life cycle of postmenopausal women by identifying the relationship between physical activity and depression on oral health behavior and awareness symptoms. Methods: The participants of this study were 1,628 menopausal women, and their general characteristics, physical activity, depression, and oral health behavior and awareness symptoms were investigated. This study used the complex sample frequency analysis, complex sample 𝞆² test, and logistic regression analysis method, which is a sample design of the National Health and Nutrition Examination Survey. Results: The factors influencing physical activity were the use of oral hygiene device and chewing difficulty. and the influencing factors of depression experience were pain and chewing difficulty. Conclusions: As a result, physical activity and depression experience should be utilized by developing and oral health program for the promotion of oral health in postmenopausal women.

• Journal of Distribution Science
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• v.19 no.7
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• pp.61-73
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• 2021

Purpose: This study offers suggestions to e-commerce companies for increasing shoppers' repurchase intention by considering the effect of distribution information in online shopping. It applies complexity theory to incorporate habitual information search behavior and shopper characteristics into the Stimulus-Organism-Response model and indicates how these complex factors work together in online shopping. Research design, data, and methodology: This study used an interview survey of 158 Vietnamese consumers with an experience of online shopping. A fuzzy-set Qualitative Comparative Analysis (fsQCA) was used to examine the relationship between antecedents and outcomes depending on complex conditions in the given contexts. Results: The results (1) indicate the importance of observing information search patterns and investigating their influence on online distribution, and (2) clarify what kind of configurations, under what conditions, predict a high or low outcome; this provides evidence and hints for the development of frameworks for future studies. Conclusions: The findings suggest that shoppers' unconscious, habitual behavior can work with conscious attitude factors, such as satisfaction, to increase their repurchase intention. Hence, e-commerce companies should consider how to present useful distribution information and create functions that allow shoppers to engage with a variety of information while increasing their repurchase intention on the site.

• Proceedings of the KWS Conference
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• 1996.10a
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• pp.114-116
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• 1996

• Bulletin of the Korean Chemical Society
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• v.24 no.7
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• pp.1035-1037
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• 2003

• Bulletin of the Korean Chemical Society
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• v.20 no.7
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• pp.835-837
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• 1999

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.1
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• pp.485-492
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• 2016

This study examined the relationships among dementia knowledge, attitude, and preventive behavior of an urban-rural complex city. In this study, 483 subjects using welfare and health centers were selected from one urban-rural complex city. The data were collected using the questionnaires for dementia knowledge, attitude and preventive behavior. Data analysis was performed by descriptive statistics, t-test and ANOVA using SPSS 19 software. In both urban and rural areas, elderly more than 70 years of age, no spouse, less educated, and lower income had higher scores of dementia attitude. In addition, the dementia attitude scores were higher when they were thinking more of their bad health. In conclusion, there is a need to strengthen the training and programs for dementia's knowledge, attitudes and prevention activities by a spouse or family member in early elderly period.

• Journal of the Korean Home Economics Association
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• v.35 no.5
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• pp.195-211
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• 1997

This thesis is conducted a survey of consumer problems and dissatisfaction and their complaining behavior. It analyzes the complex and varied consumer problems and dissatisfactions, then minimizes them and motivates active response. Also, this thesis is intended to provide fundamental study that may be used for the formulation of consumer protection polices. For this purpose, questionary survey method was used and the sample was taken from 603 housewives lives in Seoul. The major results of the study are summarized as follows; 1) Quality of product was the most frequent problem among consumer problems and dissatisfaction. 2) The level of consumer complaining behavior was 50.69/100 which is a little above median point. Non-complaining behavior was the most frequent, and followed by private/public behavior, public behavior and private behavior. 3) Path analysis of the variables affecting complaining behavior showed total causal effect to be biggest for degree of information search. The experience of consumer problems and dissatisfaction of consumers caused positive effect though causal relation.