• 한국기계가공학회지
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• 제15권3호
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• pp.72-78
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• 2016

In this study, we analyzed the accidental hydrogen embrittlement affecting the track nut on a self-propelled howitzer. Tracks are key components to maintain a high degree of confidence in the operation of the self-propelled howitzer and the safety of the crew. This study analyzed the fractured surface using SEM to review accidental damage of the wedge nut. In addition, we conducted revival tests and analyzed the results to identify the cause of the wedge nut damage from hydrogen embrittlement. We should carry out factor analysis and continuous improvement of the manufacturing process to determine the accidental breakage mechanism for future enhancement of the self-propelled howitzer. This study will be the useful reference for enhancing process designs in similar products.

• 수산해양기술연구
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• 제44권4호
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• pp.345-352
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• 2008

A self-regulatory community fisheries management program in Korea is designed to enhance fisheries resources, to protect fishing grounds of self-regulatory communities, and to manage their fisheries resources by their own regulations and knowledge. This study explored an applicable ecosystem-based management plan based on the scientific investigation and analysis. This study suggested objectives, indicators and reference points of the ecosystem-based resource management system which are applicable to selfregulatory community fisheries. The objectives of the management system are to maintain sustainable fisheries production, to maintain optimum fishing intensity, to reduce by-catch, to conserve spawning ground and habitat, to maintain optimum habitat environment, to increase/maintain abundance of prey species, to increase/maintain stock biomass, and to conduct stock enhancement on the basis of scientific assessment. The improved methods for the assessment and management are introduced by demonstrating a self-regulatory fishery which targets on hen clam in Dong-li fishing village in Busan.

• Journal of Microbiology and Biotechnology
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• 제11권5호
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• pp.739-748
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• 2001

A self-organizing fuzzy logic controller using a genetic algorithm is described, which controlled the glucose concentration for the enhancement of flavonoid production in a fed-batch cultivation of Scutellaria baicalensis G. plant cells. The substrate feeding strategy in a fed-batch culture was to increase the flavonoid production by using the proposed kinetic model. For the two-stage culture, the substrate feeding strategy consisted of a first period with 28 g/I of glucose to promote cell growth, followed by a second period with 5 g/I of glucose to promote flavonoid production. A simple fuzzy logic controller and the self-organizing fuzzy logic controller using a genetic algorithm was constructed to control the glucose concentration in a fed-batch culture. The designed fuzzy logic controllers were applied to maintain the glucose concentration at given set-points of the two-stage culture in fed-batch cultivation. The experimental results showed that the self-organizing fuzzy logic controller improved the controller\`s performance, compared with that of the simple fuzzy logic controller. The specific production yield and productivity of flavonoids in the two-stage culture were higher than those in the batch culture.

• 아태비즈니스연구
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• 제13권2호
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• pp.51-61
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• 2022

Purpose - This paper investigates how consumers' feelings of guilt affect their preference for imported products. Choosing imported products over domestic products reveals that consumers' motivation is to improve themselves. This study also tries to examine whether choosing imported goods has a restorative effect on feelings of guilt. Design/methodology/approach - We ran two experiments to test our hypothesis. Participants were recruited in China and the data analysis software used in this study was SPSS 26.0 for analysis. Findings - The results show that consumers with guilt feelings are more likely to import products than to consume domestic products, the second result shows that choosing imported products has an effect on guilt. In addition, consumers with low self-efficacy in a guilty condition prefer imported products to domestic products. Research implications or Originality - Based on previous research that focused on how guilt activates consumers' self-improvement goals, this study shows that when consumers experience feelings of guilt, they prefer imported products to reduce their negative feelings. These findings are discussed in the light of their implications for research on consumer self-motivation and ways of coping with it.

• Structural Engineering and Mechanics
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• 제87권2호
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• pp.151-164
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• 2023

The latest earthquake's costly repairs and economic disruption were brought on by excessive residual drift. Self-centering systems are one of the most efficient ways in the current generation of seismic resistance system to get rid of and reduce residual drift. The mechanics and behavior of the self-centering system in response to seismic forces were impacted by a number of important factors. The amount of post-tensioning (PT) force, which is often employed for the standing posture after an earthquake, is the first important component. The energy dissipater element is another one that has a significant impact on how the self-centering system behaves. Using the damper as a replaceable and affordable tool and fuse in self-centering frames has been recommended to boost energy absorption and dampening of structural systems during earthquakes. In this research, the self-centering steel moment frame connections are equipped with cushion flexural dampers (CFDs) as an energy dissipator system to increase energy absorption, post-yielding stiffness, and ease replacement after an earthquake. Also, it has been carefully considered how to reduce permanent deformations in the self-centering steel moment frames exposed to seismic loads while maintaining adequate stiffness, strength, and ductility. After confirming the FE model's findings with an earlier experimental PT connection, the behavior of the self-centering connection using CFD has been surveyed in this study. The FE modeling takes into account strands preloading as well as geometric and material nonlinearities. In addition to contact and sliding phenomena, gap opening and closing actions are included in the models. According to the findings, self-centering moment-resisting frames (SF-MRF) combined with CFD enhance post-yielding stiffness and energy absorption with the least amount of permeant deformation in a certain CFD thickness. The obtained findings demonstrate that the effective energy dissipation ratio (β), is increased to 0.25% while also lowering the residual drift to less than 0.5%. Also, this enhancement in the self-centering connection with CFD's seismic performance was attained with a respectable moment capacity to beam plastic moment capacity ratio.

• 산업융합연구
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• 제20권4호
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• pp.85-93
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• 2022

본 연구는 부모의 양육효능감이 발달장애인 자녀의 자립생활에 미치는 영향으로 가족역량강화의 매개역할을 검증하기 위한 목적이 있다. 이를 위해 발달장애인 부모 146명을 대상으로 설문조사를 실시하였고, SPSS 22.0 프로그램을 활용한 자료분석을 실시하였다. 매개효과는 바론과 케니의 위계적 회귀분석과 sobel-test를 진행하였다. 연구결과 부모의 양육효능감이 발달장애인 자녀의 자립수준과 가족역량강화에 정(+)적인 영향을 검증하였다. 또한 부모의 양육효능감과 발달장애인 자녀의 자립수준 사이에서 가족역량강화의 정(+)적인 매개효과를 검증하였다. 연구결과 발달장애인 자녀의 자립지원을 위한 부모의 양육강화지원과 가족역량강화를 위한 제도와 실천이 중요함을 시사한다.

• 한국심리학회지 : 문화 및 사회문제
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• 제12권2호
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• pp.21-43
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• 2006

본 연구는 남녀 대학생을 대상으로 강자, 약자와의 관계에서 암묵적으로 경험하는 동일시, 고양과 비하, 진실과 거짓을 알아보기 위해, 3가지 IAT검사와 3가지 명시적인 검사(동일시 검사, RWA, RISC)를 실시하였다. 그 결과, 대학생들은 명시적, 암묵적으로 강자를 동일시하였으며, 강자와의 관계에 고양되며, 강자와의 관계에 진실을 연합하였다. 한편 남성보다는 여성들이 강자와의 관계에 고양과 진실을 암묵적으로 연합하는 반응이 빨랐고, RWA 고집단 남성과 RWA 저집단 여성은 강자 동일시 반응이 빨랐으며, RWA 저집단과 RISC 고집단은 강자와의 관계에 진실, 약자와의 관계에 거짓을 연합하는 반응이 빠르게 나타났다. 이러한 결과는 권위주의의 구조, Tesser의 SEM 이론, 그리고 약자보호 관점의 인간관계 특성과 관련하여 논의되었다.

• 대한간호학회지
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• 제38권5호
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• pp.685-693
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• 2008

Purpose: This study was to compare and analyze sleep patterns, satisfaction of sleep, and sleep enhancement behaviors between hospitalized and non-hospitalized elderly. Methods: Subjects were 201 older adults, who were hospitalized patients or living in U-city, Gyung-gi province. Data was collected from June 10 to August 25, 2007, and was analyzed by the SAS program. Results: 1) Non-hospitalized elderly had better sleep patterns than hospitalized elderly patients. 2) There was a strong positive correlation between sleep patterns and satisfaction of sleep in both groups. 3) In hospitalized elderly, there were significant differences in sleep patterns and satisfaction of sleep by month. 4) In non-hospitalized elderly, there was a significant difference in sleep patterns by presence or absence of spouses. There was a significant difference in satisfaction of sleep by those living with others. There were significant differences in sleep enhancement behaviors by age, religion, length of time, and sponsors. Conclusion: To relieve sleep disturbances of elderly, comprehension of sleep of the aged by nursing care givers should be obtained. Also, improving environments and elder's self-esteem with religious consideration and preparation of financial conditions are needed to promote the sleep of hospitalized and non-hospitalized elderly.

• 한국전산유체공학회지
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• 제11권3호
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• pp.46-51
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• 2006

This paper presents the numerical results of fluid flow and mixing in a microfluidic device for electro-osmotic flow (EOF) with an trapezoidal electrode array on the bottom wall (ETZEA). Differently from previous EOF in a channel which only transports fluid in colloidal system. ETZEA can also be utilized to mix a target liquid with a reagent. In this study we propose a method of controlling fluid flow and mixing enhancement. To obtain the flow and mixing characteristics, numerical computations are performed by using a commercial code, CFX-10, and a self-made code LBM-D. It was found that the flow near the trapezoidal electrode in the ETZEA is of 3-D complex flows due to the zeta potential difference between the trapezoidal electrode and channel walls, and as a consequence the hetrogeneous zeta potential on the electrodes plays an important role in mixing the liquid.

• 한국콘텐츠학회논문지
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• 제11권2호
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• pp.487-494
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• 2011

본 논문의 목적은 원격교육의 정신보건사회복지교과에서 자기점검적 학습방식인 '자기평가'를 학습초기에 실시하고 이를 통해 얻게 되는 학습효과를 확인하는 것이다. 여기서 자기평가란 학습초기에 자기점검 및 자기주도성을 강조하는 학습전략이고, 학습효과란 정신장애인에 대한 사회적 거리감 감소 및 긍정적 태도 변화를 의미한다. 이를 위해, 온라인 대학에서 정신보건사회복지론 교과목을 수강하는 학생 202명을 대상으로 조사하였고, 연구변인의 파악 및 검증을 위해 빈도분석, t-test, Paired t-test, 상관관계 분석을 실시하였다. 조사결과, 사회적 거리감에서는 학습초기 자기평가를 실시한 학습자들이 비실시 학습자들 보다 통계적으로 유의미한 수준에서 학습내용을 수용하는 정서적 변화를 보였다. 긍정적 태도변화에서는 자기평가를 실시한 집단과 비실시한 집단 모두 사전 사후 간의 유의미한 점수변화가 있었다. 상대적으로 자기평가의 실시집단이 비실시집단 보다 더 높은 수준의 변화를 보였으나 두 집단 간의 차이는 통계적으로는 유의미하지 않았다. 학습초기의 자기평가의 적용은 학습자들의 자기점검을 격려하여 학습효과를 증진시킬 수 있는 학습전략으로 제시되었다.