• 한국소음진동공학회논문집
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• 제21권5호
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• pp.437-446
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• 2011

Performance of array sonars towed underwater is limited due to the self-noise induced mainly by the strumming vibration of the towing cable and also turbulent flow around the acoustic sensor module. The vibration of the towing cable generates axisymmetric waves that propagate along the acoustic module of the array sonar and produce self-noise. The present study aims to investigate the characteristics of the self-noise induced by the axisymmetric vibrations of the acoustic module. The waves of interest are the bulge and extensional waves propagating along the fluid-filled elastic hose. Dispersion relations of these waves are predicted by means of the numerical simulation to evaluate the wave speeds. The self-noise induced by the axisymmetric waves are formulated taking into account the damping of the elastic hose and the effect of the damping is investigated.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.403-406
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• 2002

Molecular self-assembled of surfactant viologen are of recent interest because they can from functional electroeds as well as micellar assemblies. which can be profitably utilized for display devices. photoelectrochemical studies and electrocatalysis as electron acceptor or electron mediator[1-3]. Fromherz et al studied the se1f-assembly of thiol and disulfide derivatives of viologens bearing long n-alkyl chains on Au electrode surface[4]. In this study, the electrochemical behavior of self-assembled viologen monolayer has been investigated with QCM, which has been known as nano-gram order mass detector. The self-assembly process of viologen was monitored using resonant frequency$({\Delta}F)$ and resonant resistance(R). The redox process of viologen was observed with resonant frequency$({\Delta}F)$.

• 대한치과교정학회지
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• 제36권6호
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• pp.474-482
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• 2006

자가 결찰 브라켓은 결찰용 와이어나 고무링 대신 특별한 hinge를 이용하기 때문에, 결찰 시 발생하는 마찰력의 감소로 효율적인 치아이동이 가능하여 전체 치료기간의 단축 효과가 있다. 이런 장점으로 최근 자가 결찰 브라켓에 대한 관심이 급증하고 있다. 그러나, 자가 결찰 브라켓만의 장점을 최대한 이용하기 위해서는 장치에 대한 충분한 이해가 필요하다. 이에 몇 가지 임상적 고려사항에 대해 소개하고자 한다.

• 대한가정학회지
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• 제34권5호
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• pp.131-144
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• 1996

The purpose of this study was to identify the effect of psychological characteristics-adolescence egocentrism, self-consciousness, body cathexis, and demographic variables on clothing behavior of adolescence. Adolescence egocentrism was measured by Kim's Imaginary Audience scale, and body cathexis, by selected questionnaires of Secord Jourard's Body Cathexis Scale. Buss's self-consciousness scae was slightly modified to assess public and Private self-consciousness, and five aspects of clothing behavior were assessed with the questionnaires from the previous studies dealing with clothing interest, psychological dependence, conformity, exhibition, dressing for others. The questionnaire were administered to 498 middle and high school boys and girls living in Seoul and the data were analyzed by Frquency, Factor Analysis, Pearson's Product Moment Correlation, ANOVA, Multiple Regression Analysis and Duncan test. The results of this study were as follows: 1) There were significant positive correlation between clothing behavior and adolescence egocentrism, self-consciousness whereas body cathexis generally were negatively related to clothing behavior. 2) Public self-consciousness and sex were the most influencial variables to clothing behavior among psychological characteristics and demographic variables. Also adolescence egocentrism was proved to be one of influencing factors on adolescence clothing behavior.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 센서 박막재료 반도체 세라믹
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• pp.23-27
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• 2003

Molecular self-assembled of surfactant viologen are of recent interest because they can from functional electrodes as well as micellar assemblies, which can be profitably utilized for display devices, photoelectrochemical studies and electrocatalysis as electron acceptor or electron mediator. Fromherz et al studied the self-assembly of thiol and disulfide derivatives of viologens bearing long n-alkyl chains on Au electrode surface. The electrochemical behavior of self-assembled viologen monolayer has been investigated with QCM, which has been known as nano-gram order mass detector. The self-assembly process of viologen was monitored using resonant frequency$({\Delta}F)$ and resonant resistance(R). The redox process of viologen was observed with resonant frequency $({\Delta}F)$.

• The Journal of Asian Finance, Economics and Business
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• 제6권2호
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• pp.123-133
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• 2019

The study aims to investigate the nexus of between role identity, self-efficacy, feeling of energy, and employee creativity in the hotel industry of Korea. The employees' innovative behaviors like creativity have been many researchers' interest for decades in the hotel industry. The hypotheses depicting the relationship among the variables have been proposed based on a review of existing literature. The number of 215 cases was used for final analysis and the results were explained through structural equation modeling. The results indicate the hotel employees' role identity and creative self-efficacy positively influenced their feeling of energy. Further, both role identity and creative self-efficacy make significant impact on employee creativity. Feeling of energy also makes a positively significant impact on employee creativity. Feeling of energy partially mediates the relationship between the two independent variables and employee creativity. As a result, creative role identity, self-efficacy, and feeling of energy explain the variance of the hotel employees' creativity. The results present that hotel practitioners need to regard their employees' creative roles and build organizational culture to support creative activities so as to enhance employee creativity. Finally, theoretical and practical implications for the hotel industry and future studies have been discussed.

• 대한통합의학회지
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• 제6권4호
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• pp.63-73
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• 2018

Purpose : This study aims to verify the effects of flipped learning on self-directed learning and class satisfaction in a class of college physical therapy students. Methods : The subjects were 97 students in College A who had registered for musculoskeletal examination and assessment and practice at the second semester of 2017. All subjects were measured with the self-directed learning questionnaire for college student proposed by Lee et al., and the class satisfaction questionnaire proposed by Lee et al., before and after intervention. The collected data were processed using a computerized statistical program SPSS Win version 21.0. Mean, standard deviation, paired t-test and Cronbach's alpha coefficient were calculated. Results : The results showed significant differences in goal setting, identify resources for learning, effort attributed to results, self-reflection of self-directed learning and problem solving excellence, class methods and contents attention and understanding(p<.05), class interest of class satisfaction(p<.05). Conclusion : These results suggest that flipped learning improves learning motivation and attitudes. Therefore, follow-up study is necessary to investigate further the application of flipped learning in various students and teaching methods.

• KEPCO Journal on Electric Power and Energy
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• 제7권2호
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• pp.295-299
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• 2021

Recently, interest in maintenance has been increasing due to the enlargement and aging of infra structures. Therefore, a new paradigm is required to secure and improve the durability of structures differentiated from the past. Accordingly, research on smart concrete incorporating the concept of self-healing into concrete is being actively conducted. In this study, the crack healing performance and durability performance of self-healing concrete applied with a hydrogel containing biomineral-forming microorganisms were evaluated. As a result of evaluating the dispersion of the hydrogel in concrete, it was confirmed that the hydrogel was well distributed in concrete matrix with a dispersion coefficient of 0.35 to 0.46. The crack healing performance evaluation was verified by a water permeability test, and showed a recovery rate of 95% or more at the age of 28 days, confirming the applicability of self-healing concrete. The durability performance of self-healing concrete was evaluated in terms of resistance to penetration of chloride ion and freezing and thawing. Regardless of the mixing of the hydrogel, the same level of durability performance was shown for various compressive strength level. Therefore, it was confirmed that the microbial admixture did not affect concrete durability. In the future, long-term crack healing performance and durability verification studies should be supplemented.

• 한국과학교육학회지
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• 제43권6호
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• pp.533-547
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• 2023

이 연구에서는 초등예비교사를 위한 과학 교수법 수업을 진행하는 교사교육자가 수업에서 마주하게 된 초등예비교사의 과학에 대한 낮은 흥미와 호기심 수준의 원인이 무엇인지 파악한 후 이를 해소하기 위한 실천 계획을 탐색하고 수업에 적용하고 성찰하였다. 이러한 실행연구를 통해 초등예비교사를 위한 과학 수업에서 교수 실천을 개선하고 초등예비교사의 과학에 대한 흥미와 호기심을 향상시킬 수 있는 방안을 제안하였다. 초등과학교재연구 물리영역 수업에 참여한 초등예비교사를 대상으로 총 3차에 걸쳐 실행과 성찰을 반복하는 나선형적 실행구조를 설계하였고, 수업 일지, 학생의 참여 데이터, 동료 및 자기 평가 결과, 초등예비교사의 강의평가 결과 등을 수집하고 분석하였다. 초등예비교사의 과학에 대한 호기심이 낮은 이유를 정보격차의 인식과 표현력 부족 및 정보격차의 해소 의지가 낮기 때문으로 보고, 정보격차의 표현 연습, 정보격차를 인식할 수 있도록 지식수준 높이기, 정보격차의 해결의지 가지기 전략을 수업에 도입하였다. 단위 수업의 개선으로 변화할 수 있는 범위 내에서 초등예비교사는 이러한 과정 속에서 과학에 대한 호기심을 가지고 이를 표현할 수 있게 되었다.

• 복식
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• 제51권8호
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• pp.93-110
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• 2001

The present study attempted to compare the behavioral patterns and attitudes of American and Korean female students toward apparel ads in magazines in relation to their physical self-concept. The study used a self-administered questionnaire. The sample consisted of 730 female students majoring in the fields related to clothing and textiles : 310 American students at six colleges and universities located in the west, northeast and southwest parts of the U.S., and 412 Korean students at four Seoul-based universities. Likert scales were used for most measures with 1=never or very unimportant and 5 =always or very important. Physical self-concept was measured on the basis of W. S. Jung's Standardized Self-concept Test and Tennessee Self-concept Scale. Surreys were back translated for validity. Percentage, t-test, Contingency Tables and Chi-square were used for the analysis of the data. Results are as follows : (1) Korean students read more magazines than U.S. students, however, Vogue was the most popular for both groups. (2) Those with a high sense of Physical self-concept read more magazines. for both countries. (3) American students'attitudes toward apparel ads in magazines were similar, regardless of whether their sense of physical self-concept was high or low. For Koreans, those with higher sense of physical self-concept showed greater interest in magazine ads, consulted magazines for fashion trends, found ads more useful, and more often expressed satisfaction with the ads, than the lower self-concept group. (4) Korean students cited a lack of information in ads while American students felt body types of models were unrealistic. Both Koreans and Americans in the higher self-concept group expressed a greater level of dissatisfaction with apparel ads in magazines. (5) Advertisers should attempt to again a deeper understanding of the socio-psychological characteristics of their readership as self-concept appears to be related to several magazine readership attitudes and behaviors. Magazines targeting Americans might consider the importance of coordination and merchandising. Apparel ads targeting Korean should consider the importance of company ads.