• 한국소음진동공학회논문집
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• 제16권3호
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• pp.226-232
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• 2006

This paper presents the dynamic analysis of an impulsively forced rotating cantilever beam with rigid body motion. The transient response induced by the impulsive force and the rigid body motion of the beam are calculated using hybrid deformation variable modeling with the Rayleigh-Ritz assumed mode methods. The stiffness variation effect due to the rigid body motion of the beam is considered in this study Also, the effects of the impulsive force position and the angular velocity on the transient responses of the beam are investigated through numerical works.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.943-947
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• 2008

Dynamic response characteristics of a beam undergoing impulsive force are investigated using the wavelet transform method in this study. When an impulse is applied to an arbitrary position of a beam, it will generate a structural deformation wave. The characteristics of the wave are changing in the domain of time and space. The maximum amplitude of each natural frequency mode and the time to reach the maximum amplitude are obtained in this study. The effects of the location of impulse on the variations of the dynamic characteristics is also investigated.

• 복식문화연구
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• 제24권2호
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• pp.119-131
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• 2016

With the increasing popularity of nonprofit thrift shopping, new marketing strategies are needed to respond to accelerated competition in the secondhand market. To help guide the development of marketing strategies for nonprofit thrift stores, this study aims to identify factors impacting consumers' buying behavior for secondhand fashion items sold in nonprofit thrift stores. Specifically, this study investigated 1) the effects of secondhand fashion selection criteria (i.e., design, brand name, lower price) and personal factors (i.e., gender, household income, beliefs about environment) on the secondhand fashion consumption experience in nonprofit thrift stores and 2) the moderating effects of point of purchase (POP) messages (i.e., "50% Off Sale," "New Arrivals," "Helping Others") on the relationships between purchase intention and impulsive buying in nonprofit thrift stores. An online survey was used to collect the data, and a total of 197 usable responses were received. The results showed that 1) gender, household income, beliefs about environment, and brand name affected the secondhand fashion consumption experience and 2) the POP message "Helping Others" negatively moderated the relationship between purchase intention and impulsive buying in nonprofit thrift stores. These results can help nonprofit thrift stores' managers to develop effective marketing strategies to increase their profits, which can be used to accomplish their mission of addressing social issues.

• 복식문화연구
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• 제28권3호
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• pp.313-329
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• 2020

Social Network Services (SNS) have become a vital means of shopping, significantly influencing consumers' purchases of fashion products. The aim of this study was to identify bandwagon consumption among fashion consumers and to analyze the effects of bandwagon consumption on negative emotions, purchase discontinuation, and switching intention. A survey questionnaire was developed, and data were obtained from 285 female consumers in Korea aged in their 20s and 30s who had experienced guilt, regret, or disappointment after purchasing fashion products using SNS during the previous six months. The survey results indicated four different types of band- wagon consumption: intentional, impulsive, unintentional, and planned. The presence of negative emotions such as guilt, disappointment, and regret were affected by different types of bandwagon consumption. Intentional bandwagon consumption only affected guilt, while unintentional bandwagon consumption affected both guilt and disappointment. Impulsive bandwagon consumption affected guilt and regret; however, planned bandwagon consumption only affected regret. Furthermore, negative emotions affected purchase discontinuation and switching intention. Planned bandwagon con- sumption had an effect on both purchase discontinuation and switching intention, while both impulsive and unintentional bandwagon consumption influenced switching intention only. Intentional bandwagon consumption had no effect on either purchase discontinuation or switching intention. The results of this study indicate that SNS consumers' bandwagon consumption causes different negative emotions, purchase discontinuation, and switching intention.

• Human Ecology Research
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• 제51권4호
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• pp.413-424
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• 2013

The purpose of this study is to examine the influence of social face sensitivity on vanity and consumption behavior. Questionnaires were administered to 461 college students living in Deagu Metropolitan City and Kyungbook province. Frequency, factor analysis, reliability analysis, regression analysis, and t-test were used for data analysis. Social face sensitivity was categorized into consciousness of being embarrassed, social formality, other consciousness and prestigiousness. Vanity factors were found as physical price, achievement concern, achievement price, and physical concern. Consumption behavior were categorized into 5 factors such as ostentatious consumption, impulsive buying, external information search, brand trust, utilization of internet information and material-oriented. Consciousness of being embarrassed, social formality, and other consciousness, the sub-variables of social face sensitivity had significant effects on achievement concerns and physical concerns. Other consciousness of social face sensitivity had significant effects on all factors of consumption behaviors. There was significant differences in the prestige of social face sensitivity and physical concerns of vanity and ostentatious consumption, impulsive buying, and also in external information search and utilization of internet information of consumer behavior. This indicates that women showed high physical concerns for vanity and ostentatious consumption, impulsive buying, external information search and utilization of internet information of consumption behavior while men care more about prestigiousness of social face sensitivity.

• 한국전기전자재료학회논문지
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• 제21권11호
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• pp.987-994
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• 2008

The optimal structure of the Tonpilz transducer was designed. First, the FE model of the transducer was constructed, that included all the details of the transducer which used practical environment. The validity of the FE model was verified through the impedance analysis of the transducer. Second, the resonance frequency, the sound pressure, the bandwidth, and the impulsive shock pressure of the transducer in relation to its structural variables were analyzed. Third, the design method of $2^n$ experiments was employed to reduce the number of analysis cases, and through statistical multiple regression analysis of the results, the functional forms of the transducer performances that could consider the cross-coupled effects of the structural variables were derived. Based on the all results, the optimal geometry of the Tonpilz transducer that had the highest sound pressure level at the desired working environment was determined through the optimization with the SQP-PD method of a target function composed of the transducer performance. Furthermore, for the convenience of a user, the automatic process program making the optimal structure of the acoustic transducer automatically at a given target and a desired working environment was made. The developed method can reflect all the cross-coupled effects of multiple structural variables, and can be extended to the design of general acoustic transducers.

• Coupled systems mechanics
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• 제5권3호
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• pp.223-234
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• 2016

The main purpose of current study is to find the soil effects on natural period of elevated tank. The coupled analytical method is used to assess in this study. The current study presented models which are capable to consider the soil dynamic stiffness changes and fluid- structure interaction effects on natural period of elevated tanks. The basic of mentioned models is extracted from elastic beam and lumped mass theory. The finite element is used to verify the results. It is observed that, external excitation can change the natural period of elevated tanks. Considering the increase of excitation frequency, the natural period will be decreased. The concluded values of natural period in case of soft and very soft soil are more affected from excitation frequency values. The high range of excitation frequency may reduce the natural period values. In addition it is observed that the excitation frequency has no significant effect on convective period compare with impulsive period.

• 한국전자파학회논문지
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• 제7권3호
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• pp.230-238
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• 1996

본 논문에서는 임펄스 잡음이 존재하는 레일리 페이딩 환경에서 다이버시티 기법에 의한 BFSK신호의 성능 개선치를 구하였으며 이를 가우스잡음의 경우와 비교하였다. Rayleigh 페이딩 환경하에서는 CNR 값이 클수록 임펄스 잡음의 영향에 관계없이 일정한 선호 성능에 수렴한 다는 것을 알았다. 또한 다이버시티 기법은 가우스 잡음뿐만 아니라 임펄스 잡음과 페이딩이 혼재하는 통신 환경 에서도 선호의 성능을 개선시킬 수 있음을 알았다. 또한 레일리 페이딩과 임펄스 잡음이 혼재하는 통신로 환경에 서 다이버시티 기법과 부호화 기법을 같이 사용하면 부호화 기법만을 사용한 경우에 비해 신호의 오율성능이 약 11[dB] 정도 개선 됨을 알았다.

• 아동학회지
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• 제29권6호
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• pp.87-103
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• 2008

The purpose of this study was to develop an intervention program for decreasing inattentive and impulsive behaviors of children with Attention-Deficit/Hyperactive Disorder (ADHD) by combining cognitive training and cognitive-behavioral therapy. Subjects were 22 children who were classified as ADHD. Eleven children among the 22 were placed randomly in the experimental group; the remaining 11 children were placed in the control group. The effectiveness of the program was analyzed by ANCOVA after controlling for effects of pre-tests on criterion variables. Results of the present study showed that the cognitive intervention program was significantly effective for improving attention span and decreasing impulsivity of children with ADHD.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제24권2호
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• pp.229-242
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• 2020

Functional fractional differential inclusions with impulse effects in general Banach spaces are studied. We discuss the situation when the semigroup generated by the linear part is equicontinuous and the multifunction is Caratheodory. First, we define the PC-mild solutions for functional fractional semilinear impulsive differential inclusions. We then prove the existence of PC-mild solutions for such inclusions by using the fixed point theorem, multivalued properties and applications of NCHM (noncompactness Hausdorff measure). Eventually, we enhance the acquired results by giving an example.