• 대한물리치료과학회지
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• 제29권1호
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• pp.64-72
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• 2022

Background: The purpose of this study is to investigate the effect of wall squat exercise according to the difference in the support surface on the thickness change of external oblique, internal oblique and transverse abdominalis of the trunk muscles and the change in distance of center of pressure when the eyes are opened and closed. Design: Randomized controlled trial. Methods: The subjects were 26 healthy adults, 18 males and 8 females. The composition of each group using the single-blind method was 13 people in the unstable side wall squat exercise group and 13 people in the stable side wall squat exercise group. Experimental measurements were divided into before, 3 weeks, and 6 weeks after the experiment, and changes in muscle thickness and balance were confirmed. Muscle thickness was measured using ultrasinic, and static balance change was measured using Bio-rescue. Results: There were significant differences in the thickness changes of external oblique, internal oblique and transverse abdominalis according to the wall squat exercise method by period and in the interaction between the period and the group (p<0.05). As a result of the post-hoc analysis, there was a significant difference in the change between the two groups in external oblique muscle after 6 weeks. And there was a significant difference in the distance of the pressure center between eyes open and closed eyes (p<0.05). Conclusion: In terms of instability, wall squat exercise was positive for changes in trunk muscle thickness. It suggests the possibility of using it for trunk muscle strengthening training in the future.

• 한국정보통신학회논문지
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• 제25권11호
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• pp.1655-1662
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• 2021

본 연구의 목적은 코로나-19로 인한 비대면 상황가운데 프로그래밍 과목을 프로젝트법으로 운영한 교수자의 교육과정 운영에 대한 사례연구를 통하여 시사점을 도출하는 데에 있다. 1학년 신입생 학생들을 대상으로 프로젝트 실시 전에 학생들의 학습상태를 판단하고자 설문을 실시하였다. 설문결과를 바탕으로 개인별 면담을 진행하여 교육에 대한 니즈를 파악 후, 프로젝트 구성을 위한 기본 문법과 프로젝트의 각 단계를 분절하는 강의를 구성하였다. 주간 퀴즈를 통한 반복학습을 유도하였으며 프로젝트 마감까지 시간을 미리 부여하여 피드백을 주었다. 23명(전체 학생 40명)은 프로젝트에 대한 수행을 완료하였고, 17명은 시험은 응시하였으나 프로젝트는 미완성하였다. 본 연구의 목적은 코로나-19로 인한 비대면 상황가운데 공대 실기과목을 프로젝트법으로 운영하면서 수업설계와 실행, 상호작용을 거쳐서 프로젝트를 수행할 수 있는가를 연구하였다는 점에서 의의가 있다.

• Animal Bioscience
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• 제35권7호
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• pp.1039-1047
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• 2022

Objective: The purpose of this study is to determine the optimal time of transportation of floor-feed and scatter-feed broilers. Methods: Eighty healthy Arbor Acres (AA) broilers (21-day-old, 624.4 g, male, standard error = 6.65) were selected and randomly divided into two experimental groups (floor-feed and scatter-feed), then fed for three weeks. The experiment comprised a 2×4 factorial design with 2 feed patterns (floor-feed and scatter-feed) and 4 transport periods (2, 3, 4, and 5 h), and 4 replicates of 5 broilers (54-day-old, 2243 g, standard error = 46.65) was used to compare weight loss, meat quality and behavior index of different groups. Results: It appeared that drip loss, meat color and resting behavior of experimental broilers changed as length of transportation (p<0.05), however, weight loss and pH were not significantly transformed (p>0.05). Compared with floor-feed group, broilers in scatter-feed group had lower pH at 24 hours (3 h) and different behavioral indicators (p<0.05). Especially indicators after 3 h transportation, there were obvious differences between the two feeding modes in the behavior reaction of stress events before slaughter with different transport duration (p<0.05). The fluctuation of data on resting behavior with scatter-feed was significantly higher than that of floor-feed broilers. There was no interaction between transport time and different feeding methods for index tested of our experiment (p>0.05). Conclusion: Comprehensive analysis showed that the maximum transport duration of floor-feed and scatter-feed broilers should not exceed 3 h, and scatter-feed broilers were more likely prone to fear.

• 한국콘텐츠학회논문지
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• 제22권7호
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• pp.370-383
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• 2022

본 연구는 경증치매노인과 배우자의 삶의 질과 긍정적 상호작용을 향상시키기 위한 실제 현장에서 적용 가능한 예술치유 프로그램을 제안하는데 목적이 있다. 이에 선행연구를 고찰한 후 이론적 담론에 근거하여 조사-분석-설계-구안-실행 및 평가의 5단계로 예술치유 프로그램을 구성하였다. 또한 Y치매안심센터를 이용하는 경증치매노인 및 배우자들에게 시범 적용하여, 예술치유 프로그램이 내적 긍정자원 마련, 부부간 상호 호혜적 자원 강화, 지역사회 이웃과의 관계 경험으로 삶의 만족도 및 행복감 증진에 효과적임을 확인하였다. 본 연구는 초고령화 사회로의 진입을 앞두고 치매 환자와 가족을 함께 지원하는 예술치유지원책을 제안하였다는 점에 의의가 있다.

• Advances in Computational Design
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• 제7권3호
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• pp.229-251
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• 2022

In 2017, an intraplate earthquake of Mw 7.1 occurred 120 km from Mexico City (CDMX). Most collapsed structural buildings stroked by the earthquake were flat slab systems joined to reinforced concrete (RC) columns, unreinforced masonry, confined masonry, and dual systems. This article presents the simulated response of an actual six-story RC frame building with masonry infill walls that did not collapse during the 2017 earthquake. It has a structural system similar to that of many of the collapsed buildings and is located in a high seismic amplification zone. Five 3D numerical models were used in the study to model the seismic response of the building. The building dynamic properties were identified using an ambient vibration test (AVT), enabling validation of the building's finite element models. Several assumptions were made to calibrate the numerical model to the properties identified from the AVT, such as the presence of adjacent buildings, variations in masonry properties, soil-foundation-structure interaction, and the contribution of non-structural elements. The results showed that the infill masonry wall would act as a compression strut and crack along the transverse direction because the shear stresses in the original model (0.85 MPa) exceeded the shear strength (0.38 MPa). In compression, the strut presents lower stresses (3.42 MPa) well below its capacity (6.8 MPa). Although the non-structural elements were not considered to be part of the lateral resistant system, the results showed that these elements could contribute by resisting part of the base shear force, reaching a force of 82 kN.

• 유통과학연구
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• 제20권5호
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• pp.65-74
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• 2022

Purpose: This paper evaluates which characteristics of marketing communication content distributed on social networks impact electronic word-of-mouth (e-WOM). Research design, data, and methodology: Quantitative research was carried out on 637 Vietnamese people aged from 18, who were exposed to marketing communication programs of fashion brands. Preliminary data were analyzed by the reliability of the scale, multivariate regression analysis, and analysis of variance. Results: The research findings have identified the four characteristics of social media content that positively impact e-WOM, including entertainment, interaction, trendiness, and customization. Participants aged 30 and under have a higher appreciation for media content and e-WOM than those from 31 and over. Conclusion: To promote e-WOM, marketing communication content distributed on social networks should focus on the following characteristics: (1) The entertainment of marketing communication content should involve positive emotions, fun, and enjoyment; (2) With interactive content, focus should be placed on discussion and exchange content, content that encourages sharing, and two-way interactive content; (3) For trending marketing communication content, marketers consider communicating brand-related latest information, up-to-date information, and hot discussion topics; and (4) When creating customized content, brands should be interesting, customized (information, product, price), and unique.

• Journal of Korea Trade
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• 제25권2호
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• pp.95-110
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• 2021

Purpose - This paper intends to conduct theoretical analysis and empirical test on the action mechanism of South Korea-China trade and South Korea's FDI to China on green total factor productivity, so as to provide a new perspective and ideas for the improvement of China's green total factor productivity and promote the high-quality development of China's economy Design/methodology - This paper uses the data of 30 provinces, autonomous regions and municipalities in China from 2004 to 2017 as the research sample, adopts the GML index method of SBM Directional Distance Function to measure GTFP, and analyzes the influence of South Korea-China trade and FDI from South Korea on China's GTFP. Findings - Trade is conducive to promoting technological progress, which has a significant promotion effect on China's green total factor productivity. While FDI has a significant inhibitory effect on China's green total factor productivity, which verifies the "pollution haven" hypothesis. In addition, such influence has certain regional overall heterogeneity. Trade has a more significant promoting effect on GTFP in eastern coastal areas, while FDI has a more significant inhibitory effect on GTFP in central and western inland areas. The interaction between trade and FDI is conducive to the improvement of green total factor productivity, indicating that the benign mechanism of trade and FDI has been formed. Urbanization, industrial structure, human resource level and investment in science and technology are all conducive to the improvement of GTFP. Originality/value - Through theoretical analysis and empirical test on the action mechanism of South Korea-China trade and South Korea's FDI on green total factor productivity, this paper provides a solid theoretical foundation for the further development of China-South Korea economic and trade cooperation in the future.

• 디지털융복합연구
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• 제19권7호
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• pp.51-56
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• 2021

교양 SW교육은 전공 SW교육과는 다르게 다양한 전공의 학생들이 동일학습과정에 참여하므로 교수자가 문제 설계에 어려움이 많다. 본 논문은 교육의 문제 해결 향상을 위하여 PBL로 수업 운영에 있어 다양한 전공의 학생들에게 전공의 특성에 맞게 문제를 설계 구현할 수 있도록 VPBL(Various Problem-based Learning) 모델을 연구하고 수업에 적용 및 결과를 분석하였다. VPBL은 프로그래밍 언어에 대한 제약조건을 교수자가 제시하고 학습자는 제약조건을 적용하여 전공의 특성을 반영한 문제를 설계 운영한다. 교수자는 설계된 문제를 해결하는 과정에서 mini_class를 실시한 후 전체에 공유한다. VPBL 모델 적용 결과 전통적인 수업 방식의 비교 분석결과 전통적 교수법은 3.34점 VPBL 모델 적용은 4.42점으로 "상호작용, 학습 내용 이해, 교과 관련 지식 습득" 등이 향상된 것으로 나타났다. VPBL의 경우 다양한 문제 해결을 기반으로 하고 있어 해결 과정에서 학습 범위를 확장하는 장점을 보였다. 향후 다양한 SW 교양 교과에 확대 적용 및 활용에 대한 연구가 요구된다.

• Journal of Korea Trade
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• 제25권1호
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• pp.34-46
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• 2021

Purpose - This paper aims to analyze the impact of the terms of trade, export price, and import price on the Korean economy (that is, real GDP, CPI, money market rate, and real effective exchange rate), and vice versa in the simple vector autoregression. Design/methodology - We impose two assumptions, i.e., diagonality and bloc exogeneity, to correctly identify the impact of a factor to the others in the structural equation. With two contemporaneous assumptions in the structural VAR, this paper investigates the impacts of the terms of trade on the Korean economy and vice versa. Findings - Impulse responses to the shocks in the terms of trade and Korean economy show that 1) an impact of the terms of trade on the economy is different in export prices and in import prices. A higher export price is beneficial to the economy while a higher import price hurts the economy, and 2) an increase in real effective exchange rate and in interest rate constrains domestic production and lowers consumer prices. Originality/value - Unlike the conventional perception that a depreciation of a currency would promote exports and domestic production at the price of inflation, our result shows the opposite, and 3) real GDP and consumer prices are positively correlated. That is, an increase in real GDP does not only cause inflation, but an increase in consumer prices also promote domestic production. Yet, the only difference is that export prices and import prices end up higher with an increase in real GDP, but lower with inflation.

• Advances in nano research
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• 제11권6호
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• pp.581-593
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• 2021

This model is proposed to describe the buckling behavior of Carbon Nanotubes (CNTs) embedded in an elastic medium taking into account the combined effects of the magnetic field, the temperature, the nonlocal parameter, the number of walls. Using Eringen's nonlocal elasticity theory, thin cylindrical shell theory and Van der Waal force (VdW) interactions, we develop a system of partial differential equations governing the buckling response of CNTs embedded on Winkler, Pasternak, and Kerr foundations in a thermal-magnetic environment. The pre-buckling stresses are obtained by applying airy's stress function and an adjacent equilibrium criterion. To estimate the nonlocal critical buckling load of CNTs under the simultaneous effects of the magnetic field, the temperature change, and the number of walls, an optimization technique is proposed. Furthermore, analytical formulas are developed to obtain the buckling behavior of SWCNTs embedded in an elastic medium without taking into account the effects of the nonlocal parameter. These formulas take into account VdW interactions between adjacent tubes and the effect of terms involving differences in tube radii generally neglected in the derived expressions of the critical buckling load published in the literature. Most scientific research on modeling the effects of magnetic fields is based on beam theories, this motivation pushes me to develop a cylindrical shell model for studying the effect of the magnetic field on the static behavior of CNTs. The results show that the magnetic field has significant effects on the static behavior of CNTs and can lead to slow buckling. On the other hand, thermal effects reduce the critical buckling load. The findings in this work can help us design of CNTs for various applications (e.g. structural, electrical, mechanical and biological applications) in a thermal and magnetic environment.