• Korean Journal of Social Welfare
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• v.62 no.4
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• pp.193-222
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• 2010

This questionnaire study examined the processes linking complexity of self-construal to self-positivity conceptualized as taking multiple perspectives, self-acceptance and self-regulation that, in turn, affect psychological well-being among people with an experience of life-crisis during adulthood due to physical disability or divorce. Data were drawn from 359 adult Koreans residing in Seoul metropolitan area, including the physically disabled, the divorced, and their counterparts without a life-crisis experience during adulthood for comparison. On average, the life-crisis experience group(LEG) had a higher independent selfconstrual and a lower interdependent self-construal than the comparison group(CG). As predicted, complexity of self-construal contributed to taking multiple perspectives that helps searching for meaning, and this, in turn, was found to foster self-acceptance and self-regulation. Through these variables except self-regulation, complex self-construal contributed to psychological well-being as manifested by a higher level of positive emotion and a lower level of depression. As expected, while taking multiple perspectives fostered positive emotion both directly and indirectly through self-acceptance among LEG and CG, only in LEG it directly reduced depression. The comparative approach employed in this study enabled to discern that taking multiple perspectives promotes psychological well-being in LEG by contributing to both meaning making and positive attitude, whereas it promotes psychological well-being in CG primarily by fostering positive attitude. Finally implications for this study were discussed and directions for future research were suggested.

• Proceedings of the KSMRM Conference
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• 2001.11a
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• pp.73-83
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• 2001

영상의 좋고 나쁨을 나타낼 때는 대조도, 해상도, 잡음 그리고 Artifact 등을 정량적으로 측정하거나 기준이 되는 영상과 정성적으로 비교하게 된다. 이 중에서 Artifact는 영상의 해부학적 진단에 오류를 범하게 하여 엉뚱한 병리학적 해석을 내리게 하거나 해석이 불가능하게 하기도 하므로 적절한 규명을 하여 그 원인을 제거하는 등, 응당한 조치를 취해 최상의 화질을 유지하기 위한 노력을 기울여야한다. MR 영상에서 Artifact는 기하학적 늘림(stretch), 주름(wrinkle), 왜곡(distortion), 허상(ghost), 줄(line), 눈잡음(snow noise), 신호의 증감 등과 같은 다양한 현상으로 나타나며 이들은 영상을 해석할 때 오류를 범하는 원인이 된다. Artifact의 발생원인으로는 MR 장치의 기능장애, 부적절한 영상기법의 구사, 또는 MR 영상의 고유한 성질에 기인하기도 한다. MR Artifacts의 근본적인 이해를 위해서는 MRI의 물리적 원리와 장비에 관한 이해가 필요하다. 이렇게 MR Artifact는 여러 가지 인자들이 복합적인 관계를 가지고 나타나기 때문에 분류하기가 쉽지 않지만 전형적인 양상과 원인 그리고 그에 대한 여러 가지 대책을 살펴보고자 한다.

• Journal of Digital Convergence
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• v.16 no.4
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• pp.137-147
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• 2018

The purpose of this study was to examine the influence of variables of TAM, user characteristics variables, and perceived risk variables on the intention to use mobile payment. Through the combination of characteristics of mobile payment, this study also investigated the effect of various independent variables on the intention to use mobile payment including the moderating effect of self-construal. To verify hypotheses of this study, the hierarchical regression analysis based on responses from 188 undergraduate and graduate students was conducted. The significant findings of this study were as follows: TAM variables, user characteristics variables and perceived risk variables had positive influence on the intention to use mobile payment. Self-construal was found to moderate the effect of the perceived usefulness, perceived ease of use and subjective norm. This study may provide important implications for both academicians and practitioners.

• Journal of Digital Convergence
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• v.16 no.3
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• pp.261-273
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• 2018

The purpose of this study is to find out how the online brand community characteristics affect customer behavior according to self-construal level and gender difference. The characteristics of online community are divided into interaction, objectivity, information provision, and activity reward. First, interactivity and activity compensation among the characteristics of online community have a positive effect on brand community commitment. On the other hand, the effect of purpose and information provision is insufficient. Second, the greater the commitment to the brand community, the higher the WOM effect is. Finally, this study shows that customers with dependent self-construal tendencies have more brand community support than customers with independent self-construal tendencies, and females show more brand community support than males. This study suggests an efficient marketing approach to companies through a brand community commitment by understanding the intrinsic motivation of consumers' self-construal level.

• Journal of Digital Convergence
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• v.17 no.7
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• pp.317-329
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• 2019

Instagram, a photo and image centered social networking service, has received increasing attention these days, from scholars and practitioners. However, little is known about the social and psychological factors that lead consumers to use this service. To provide a baseline understanding on Instagram users, the current study was conducted to discover perfectionistic self-presentation tendency expressed by the Instagram users and explore the relationships between identified perfectionistic self-presentation and intention to use Instagram variables with 250 participants. In addition, this study tried to determine the moderator effect of self-efficacy and self-construal. A comprehensive survey was directed and a total of 380 participants were recruited to verify anticipated hypotheses and research questions. The research results suggest that perfectionistic self-presentation has five sub factors: others conscious self-presentation, subjective self-presentation, environmental adaptation self-presentation, self-expansion self-presentation, and social self-presentation. The implications of this research findings are discussed.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.3
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• pp.471-476
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• 2021

Soft magnetic composite (SMC) materials based on powder metallurgy have a number of advantages over the conventional electrical steel sheets commonly used in electric machines. Thus, technologies related to these materials have shown significant improvement in recent years. In general, SMCs are magnetically isotropic owing to the shape of the powder, which makes them suitable for the construction of electric machines with three-dimensional flux and complex structures. However, the materials with isotropic magnetic properties (such as SMCs) have complex vector hysteresis; thus, it is very difficult to predict accurate loss properties. Therefore, we manufactured ring-type specimens of electrical steel sheets and SMC, which analyzed their magnetic properties according to the specimen size, and performed the electromagnetic field analysis of a high-speed permanent magnet (PM) motor driven at 800 Hz or higher using the measured magnetic information to compare the core loss of the motor. The reliability of this paper has been verified by measuring the efficiency after manufacturing the motor.

• Composites Research
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• v.14 no.3
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• pp.77-89
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• 2001

Since the critical whirling vibration frequency of high speed built-in type motor spindle systems is dependent on the rotor mass of the built-in motor and the spindle specific bending modulus, the rotor and the shaft were designed using magnetic powder containing epoxy and high modulus carbon fiber epoxy composite, respectively. In order to increase the amount of the magnetic flux of the composite squirrel cage rotor of an AC induction motor, a steel core was inserted into the composite rotor. From the magnetic analysis, the optimal configurations of steel core and conductor bars for the dynamic characteristics of the rotor system were determined and proposed. The temperature dependence of composite squirrel cage rotor materials was investigated by various experiments such as TMA, DMA and VSM.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.19 no.3 s.73
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• pp.233-238
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• 2006

In this paper, mixed mode magneto-rheological(MR) damper, which is applicable for vibration control of a small scale multi-story structure, is devised. First, the schematic configurations of the shear, flow, and mixed mode MR dampers are described with design constraints and then the analytical models to predict the field-dependent damping forces are derived for each type. Second, an appropriate size of the mixed mode MR damper is manufactured and its field-dependent damping characteristics are evaluated in time domain. Finally, the performance of the manufactured MR damper which is semi-actively applied to a small scale building excited by earthquake load, is numerically evaluated.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.97-97
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• 2012

반도체 및 디스플레이 공정등에서 고진공 및 급 배기 환경을 제공하기 위하여 사용되는 터보분자펌프 (Turbomolecular Pump, TMP)는 다층의 회전깃을 갖는 로터를 회전시켜 분자를 배출시키는 방식을 사용하는 진공펌프이다. 또한 최근에는 디스플레이 및 반도체 공정에서 높은 진공도뿐만 아니라, 높은 배기속도를 요구하는 추세에 따라, 터보 펌프와 드래그 펌프부분을 동시에 가지고 있어 상대적으로 작동 진공도 영역이 넓은 복합 분자펌프(Compound Turbomolecular Pump, CMP)의 활용도가 넓어지고 있다. 이러한 분자펌프가 장시간의 고속회전에 적합하고, 베어링에서의 오염을 없앨 수 있는 비접촉 방식인 자기부상 방식이 주로 적용된다. 자기베어링 시스템은 하드웨어와 소프트웨어로 나누어질 수 있는데, 하드웨어는 회전하게 되는 블레이드 로터 및 자기베어링 로터, 모터 로터 등이 포함된 축과 고정되어 있는 자기베어링 코어와 코일, 변위센서 등의 펌프 하우징 부분, 또한 이를 제어하기 위한 전력 증폭 시스템 등의 기전적인 요소들이 이루어져 있다. 소프트웨어라 할 수 있는 제어시스템에 있어서 자기 베어링이 불안정한 특성을 갖는 개루프계를 갖고 있으므로 안정화를 위한 능동제어 시스템이 필수적이며 진동제어 등의 기능을 갖도록 적용된다. 따라서 이러한 복합분자펌프의 성능은 이러한 시스템을 구성하는 개별 요소의 성능과 이를 통합한 제어시스템의 성능이 결정한다고 할 수 있다. 본 논문에서는 현재 개발중인 2,500 l/s급의 자기부상형 고진공 복합분자펌프의 시작품에 대하여 고속회전의 안정성에 대한 연구를 수행한 내용을 보고하고 있다. 디지털 제어시스템을 적용한 시작품의 최대 26,000 rpm까지의 고속회전시의 회전 응답 및 진동 특성을 측정 분석하였으며, 로터의 고유진동수 및 진동 모우드를 분석하였다. 또한 연속 작동시의 발열특성과 각 부분의 온도와 회전 안정성과의 관계를 평가하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1654-1658
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• 2008

하천에서는 최적 하도계획의 수립과 하천관리를 위하여 유량관측소가 설치 운영되고 있으며, 통상 자기기록계에 의해 수위를 계속적으로 기록하고 있다. 또한 하천의 흐름 해석시 부등류 및 부정류 해석을 통하여 수위를 계산하게 되는데 이때 조도계수는 매우 중요한 매개변수이다. 이러한 조도계수는 대상하도의 복합적 요소에 의하여 결정되어지며 특히 유량에 대한 가변성이 크다. 본 연구에서는 도시하천인 우이천 유역을 대상으로 과거 수위 및 유량관측 자료를 토대로 유속 및 경심을 산정한 후 Manning의 평균유속 공식에 의해 역산하여 조도계수를 산정하였다. 또한 고정조도계수모형과 멱함수형태의 역산조도 계수모형의 결과를 실측 홍수위와 비교 분석하였다. 실제로 관측 수위에 대한 검증결과 유량에 따른 조도계수의 가변적 특징을 확인할 수 있었으며, 역산 조도계수 방법에 의한 흐름해석의 결과가 관측홍수위에 민감하게 반응함을 확인하였다.