• Journal of Ship and Ocean Technology
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• 제11권2호
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• pp.26-33
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• 2007

For the assessment of the retardation of fatigue crack propagation behavior due to overload, new FE analysis algorithms considering compressive residual stress redistribution near crack tip was proposed in this paper. The size of plastic zone near crack tip was obtained by elasto-plastic analysis and it was compared with Irwin's equation. The amount of residual stress redistribution was assessed by subsequent elasto-plastic analysis, and the difference of residual stress distributions between constant amplitude load and overload was obtained. In the analysis of fatigue crack propagation, the applied SIF range was evaluated by ASTM E647, and the effect of residual stresses on crack propagation was considered using the effective SIF concept. The test results of crack propagations were compared with the predicted data obtained by the analysis.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.829-832
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• 1997

It is difficult to explain the effects of complex variable loading experienced by the machine and the structure only with the studies of the single-overload itself. Hence, it is thought that the variation of overload-holding time are required to explain the effects more clearly. The effects of the overload were analyzed by means of the crack retardation, and the fractography on retardation zone. A characteristic of the fractography on retardation zone was that striation distribution did not appear due to decreased crack driving force. Rotary bending fatigue tests were performed with the circular shaft which has two hole defects.

• 전기학회논문지
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• 제59권3호
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• pp.506-514
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• 2010

Defense systems are needed to prevent catastrophic failures of a power grid due to cascaded events. Cascaded events can be occurred by power flow overload. Especially, it is the most dangerous problem that overload line is outage, because it can make the power system face danger of cascaded. In this paper, vulnerability evaluation for monitoring wide are outage is proposed using by configuration information of transmission systems. This method of vulnerability evaluation is considered direct effect and indirect effect of power flow, especially overload. What is more, it can be used when the configuration of power system changes, as simple fault occurs or maintenance of facility. In the case studies, the estimation and simulation network have been testified and analysed in PSSE and C programming.

• Journal of Information Technology Applications and Management
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• 제28권5호
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• pp.61-70
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• 2021

With the proliferation of smartphones and 5G networks, mobile social network service (SNS) has become an indispensable part of people's daily lives. However, with the use of SNS, fatigue and withdrawal behavior gradually emerged. Based on The Transactional Theory of Stress and Coping (TTSC), we explored the mechanism of SNS overload on users' discontinuous intention under the framework of "stressor-strain-outcome". And we also investigated the moderating effects of gender in this process. We hope that through our research, we can help SNS users to reduce unnecessary fatigue, and provide better suggestions for platform designers to adjust product design to improve user experience.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2002년도 추계학술대회 논문집
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• pp.73-78
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• 2002

Ships and ocean structures are generally under random loading. Various type of variable-amplitude loading affects fatigue crack growth and fatigue life. However interaction effects due to irregularity of loading including random loading have not explained exactly and it is difficult to examined fatigue crack growth behaviour and fatigue life for this reason. Therefore in this paper crack growth tests with constant-amplitude loading including a single overload were conducted to measure plastic zone size near crack tip of DENT specimen. And the observed plastic zone sized were discussed in terms of crack growth rate. As a result of this the effect the plastic rue size due to the overload is examined on the effect on crack growth rate and, consequently, fatigue life.

• 한국의류산업학회지
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• 제21권2호
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• pp.141-150
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• 2019

Online recommendation services help people search for an appropriate product among a huge assortment in stores that also minimize consumers' choice overload. People with a need for uniqueness are likely to prefer this online recommendation service based on individual needs and tastes. This study verifies the effect of consumers' choice overload and similarity avoidance in consumers' evaluation towards an online recommendation service with a focus on innovativeness and use comparability. Two-hundred consumers participated in this study and data were collected through an online survey firm. A mock retailer's webpage was created and showed six types of sneakers, which was presented as a result of product recommendation based on consumers' personal information. Data was analyzed using confirmatory factor analysis (CFA), analysis of variance (ANOVA), and regression analysis. The results show that people with a high similarity avoidance perceive an online recommendation service as an innovative and compatible service. They also perceive a high level of use compatibility for an online recommendation service, especially when it is difficult to choose a product under choice overload. Innovativeness and use compatibility of an online recommendation service increase behavioral intention. The results of this study can contribute to strategies to start online recommendation services from online retailers' websites that identify circumstances in which consumers can adopt innovative services in a positive manner.

• 한국정보시스템학회지:정보시스템연구
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• 제24권2호
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• pp.53-72
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• 2015

Purpose The purpose of this study was to investigate the factors affecting the users' stress and using reluctant intention to use social network service(SNS). This study especially focused on stress of SNSs' user. Because SNS has led to negative effects such as invasion of privacy, addiction and social overload recently. In addition, adverse effects of SNS had caused SNSs' user to feel stress and fatigue. Design/methodology/approach This study developed hypotheses to empirically examine the factors that affect SNS users' stress and using reluctant intention. In order to verify research hypotheses, this study collected data from 362 users who currently use the SNS in Korea. Further, we used the smartPLS analysis. Findings The results of this study are as follows; First, reputation perception, unwanted relation burden, privacy concern, information overload and interaction overload had a significant positive effect on SNS users' stress. But international influence had no significant positive effect on SNS users' stress. Second, SNS users' stress had a significant positive effect on using reluctant intention. The results of this study provides theoretical foundations on the research for dark side of SNS and implies that SNS providers are in need of exerting an effort to minimize the negative aspects.

• 한국심리학회지 : 문화 및 사회문제
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• 제23권2호
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• pp.97-129
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• 2017

본 연구는 테크노 스트레스의 유발요인 중 테크노 과중과 테크노 침해가 일로부터의 심리적 분리에 미치는 영향을 확인하고, 일로부터의 심리적 분리가 일-가정 갈등에 어떠한 영향을 미치는지 그 과정을 살펴보기 위해 이루어졌다. 또한 테크노 과중 및 테크노 침해와 일로부터의 심리적 분리의 관계에서 상사-부하 교환관계의 조절효과를 검증하고자 했다. 이를 위해 총 43문항으로 구성된 자기보고식 설문지를 이용하여 다양한 직종에서 근무하는 직장인들을 대상으로 설문조사를 실시하였으며, 총 306명의 자료가 분석에 사용되었다. 분석 결과, 테크노 침해를 높게 지각할수록 일로부터의 심리적 분리를 더 낮게 지각한다는 것을 확인할 수 있었으며, 테크노 침해가 일로부터의 심리적 분리를 매개로 하여 일-가정 갈등을 높인다는 것을 알 수 있었다. 또한, 상사-부하 교환관계의 질이 높을수록 테크노 침해와 일로부터의 심리적 분리 간의 관계가 완화되는 것을 확인할 수 있었다. 이러한 연구 결과를 바탕으로 연구의 의의 및 시사점, 그리고 연구가 갖는 한계점과 향후 연구를 위한 제언 등을 통합적으로 논의하였다.

• 디지털융복합연구
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• 제18권4호
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• pp.137-148
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• 2020

디지털 시대에 많아진 정보에 따른 소비자 선택의 다양성은 긍정적이지만 여러 문제도 나타나고 있다. 본 연구의 목적은 쇼핑몰을 구성하고 있는 요인들이 온라인소비자의 행동에 영향을 미치는 과정에서 정보과부하가 어떤 매개역할을 하는 가를 살펴보는 것이다. 쇼핑몰의 특성과 관련된 요인들로 쇼핑몰의 인지도, 쇼핑몰의 품질, 쇼핑몰의 구성, 그리고 구매 추천서비스 등을 설정하여, 정보과부하가 나타날 때 이러한 변수들이 온라인소비자의 행동에 어떤 변화를 나타내는지 분석하였다. 분석결과 쇼핑몰의 특성 요인들은 모두 온라인소비자의 행동에 일정하게 영향을 미치는 것으로 분석되고 있으며, 정보과부하도 쇼핑몰의 인지도와 쇼핑몰의 품질 및 구조, 구매 추천 서비스 구비 등의 요인에 대해 모두 일정한 매개효과를 갖는 것으로 분석되었다. 그리고 쇼핑몰의 특성 요인들은 정보과부하 상황에서도 온라인소비자의 행동에 긍정적 영향을 미치고 있는 것으로 나타나고 있다.

• 한국콘텐츠학회논문지
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• 제17권4호
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• pp.275-284
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• 2017

다양한 선택사항이 있는 모듈형 제품은 제품 구조나 배열 변경의 용이성을 장점으로 소비자들의 제품선택 폭을 확대해주고 맞춤형 제품의 구매기회를 제공해 준다. 또한 생산자로서의 소비자 역할을 수행케 함으로써 구매 후 부조화 감소와 제품 사용과정에서의 이용만족도도 높여 준다. 하지만 과도한 모듈화 또는 선택사항의 증가는 소비자들의 구매의사결정과정에서 정보량 과다에 따른 소비자의 과잉혼란을 유발하여 구매결정의 연기 및 포기하는 부정적 결과를 유발할 수도 있다. 이에 본 연구에서는 선택 사항 즉 옵션 수에 따라 달라질 수 있는 과잉혼란의 지각 정도가 소비자들의 심리적 성향인 조절초점, 제품친숙도, 자기효능감 등에 의해 어떤 영향을 받는지 살펴보고자 한다. 이를 위해 모듈형 제품의 옵션 수에 따른 과잉혼란 지각정도가 이들 세 가지 변수의 영향에 따라 달라질 수 있다는 3가지 조절효과 가설을 선행연구에 근거하여 도출하였다. 실험 결과 조절초점의 조절효과 검증에서는 향상초점 소비자에 비해 예방초점 소비자가 옵션 수 확장에 따른 과잉혼란을 더 크게 지각하는 것으로 나타났다. 또한 제품친숙도와 자기효능감의 조절효과 검증에서는 이들 두 변수 모두 그 정도가 낮은 그룹이 높은 그룹에 비해 옵션 수 확장에 따라 과잉혼란을 더 크게 지각하는 것으로 나타났다.