• Journal of the Korean Society for Nondestructive Testing
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• v.28 no.5
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• pp.401-406
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• 2008

Recently, portable magnetic sensors with high sensitivity are strongly required for various applications such as biosensor, nondestructive testing and directional sensor. A novel magnetic sensor system was developed by utilizing giant magnetoimpedance(MI) effect of soft magnetic ribbons. The sensor system consists of sensing head of $Co_{66}Fe_{4}Si_{15}B_{15}$ ribbon having asymmetric MI characteristics through exchange coupling produced by field-annealing in open air and circuit for signal processing. The sensor system showed almost linear characteristics in dynamic range of $-1\;Oe\;{\sim}\;1\;Oe$ and sensitivity of 10.5 V/Oe. The sensor was applicable to nondestructive testing system to detect defects in wire ropes.

• Journal of the Korea Concrete Institute
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• v.14 no.2
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• pp.249-256
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• 2002

High performance concrete is prone to large autogenous shrinkage due to its low water to binder ratio (W/B). The autogenous shrinkage of concrete is caused by self-desiccation as a result of water consumption by the hydration of cement. In this study, the autogenous shrinkage of high performance concrete with and without fly ash was Investigated. The properties of fresh concrete, slump loss, air content, and flowability as well as the mechanical properties, compressive strength and modulus of elasticity, were also measured. Test results was shown that the autogenous shrinkage of concrete increased as the W/B decreased. For the same W/B, the autogenous shrinkage of high strength concrete with fly ash was considerably reduced although the development of its compressive strength was delayed at early ages. Furthermore, the autogenous shrinkage and compressive strength of high strength concrete were more rapidly developed than those of normal strength concrete. It was concluded that fly ash could improve the quality of high strength concrete with respect to the workability and autogenous shrinkage.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.01a
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• pp.135-138
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• 2012

본 연구는 다중참여역할수행게임(Massive Multiplayer Online Role Playing Game, 이하 MMORPG)이 자기주도 학습능력에 미치는 효과를 살펴보는데 목적이 있으며, 초등학교에 재학중인 4, 5, 6학년 3개 학급을 실험 대상으로 4주간 실험하였다. 실험집단은 방과 후 수업시간을 이용하여 일주일에 2시간 이상 MMORPG를 활용한 한자수업을 학습하도록 지도하였고, 통제집단은 교사의 수업 진행으로 학습하였다. 실험 전 두 집단 간의 자기주도 학습능력에 대한 동질성을 검증하기 위하여 자기주도 학습준비도 검사(Self-Directed Learning Readiness Scale, 이하 SDLRS)를 이용하여 자기주도 학습능력 사전검사를 실시하였고, 4주간 실험이 끝난 후 자기주도 학습능력 검사의 차이를 알아보았다. 더 나아가 하위요소인 효율적인 학습자라는 개념, 학습에 대한 솔선수범 및 독립성, 창의성, 자신의 학습에 대한 책임감, 기본학습 기능과 문제해결 기술, 미래 지향적인 자기이해 학습기회에 대한 개방성, 학습에 대한 애정과 열성을 다변량분산분석(MANOVA)를 실시하여 통계분석 하였다. 이러한 연구결과들을 바탕으로 다음과 같은 결론을 내릴 수 있다. 첫째, MMORPG를 활용한 한자학습과 일반교실 한자학습은 독립표본 t검정 결과 자기주도 학습능력에서 유의미한 차이가 나타났다. 즉, MMORPG를 활용한 한자학습이 일반교실수업에 의한 학습보다 높은 자기주도 학습능력 정도를 보여 주었다. 둘째, MMORPG를 활용한 한자학습이 하위요소 간에 어떠한 여향을 미치는가를 알아보기 위해 실시한 MANOVA 결과 효율적인 학습자라는 개념, 학습에 대한 솔선수범 및 독립성, 창의성, 자신의 학습에 대한 책임감, 기본학습 기능과 문제해결 기술, 미래 지향적인 자기이해에서는 유의미한 것으로 나왔지만 학습기회에 대한 개방성, 학습에 대한 애정과 열성에서는 유의미한 결과를 얻지 못하였다.

• Journal of the Korean Magnetics Society
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• v.17 no.6
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• pp.221-225
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• 2007

The effects of $Ga^+$ ion irradiation on the magnetic properties of the $Co_{73}Pt_{27}-TiO_2$ perpendicular magnetic recording media were investigated. As $Ga^+$ ion dose increased from $1\times10^{15}ions/cm^2\;to\;30\times10^{15}ions/cm^2$, the perpendicular magnetic anisotropy was degraded and no longer observed above $20\times10^{15}ions/cm^2$ dose. The deterioration of the perpendicular magnetic anisotropy and ferromagnetic properties can be attributed to the concentration profile change due to Ga+ ion implantation. The magnetic islands of $70\times70nm^2\;and\;100\times100nm^2$ size were successfully fabricated with $Ga^+$ ion irradiation.

• Journal of the Korean Magnetics Society
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• v.16 no.2
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• pp.136-139
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• 2006

The tunneling magnetoresistance (TMR) ratios of magnetic tunnel junctions (MTJs), in general, decrease abruptly above 250$^{\circ}C$ due to Mn interdiffusion from an antiferromagnet IrMn layer to a ferromagnetic CoFe and/or a tunnel barrier. To improve thermal stability, we prepared MTJs with nano-oxide layers. Using a MTJ structure consisting of underlayer CoNbZr 4/bufferlayer CoFe 10/antiferromaget IrMn 7.5/pinned layer CoFe 3/tunnel barrier AlO/freelayer CoFe 3/capping CoNbZr 2 (nm), we placed a nano-oxide layer (NOL) into the underlayer or bufferlayer. Then, the thermal, structural and magneto-electric properties were measured. The TMR ratio, surface flatness, and thermal stability of the MTJs with NOLs were promoted.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.313-320
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• 2023

This study was to examine the effect of the hypertension self-management education program on hypertension specific self-efficacy in the aged. This study was conducted with one group pre-test and post-test design. A total 31 the aged participated in 4 weeks of intervention. Data were analyzed as SPSS ver. 21.0 using descriptive statistics and paired t-test. We have identified that hypertension specific self-efficacy(t= -3.46, p< 0.000^***) and disease awareness(t= -5.69, p<0.000^***) significantly increased. We found that 4-weeks is appropriate for hypertension self-management education program. We suggested that for over 80's, customized program should be provided.

• 한국노년학
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• v.29 no.4
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• pp.1629-1644
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• 2009

This study was to examine the relationship between self-differentiation and mental health of elderly couples. This study also tries to investigate the effect of self-differentiation on mental health. Data were collected using self-administered questionnaire method with 271 elderly couples over 55 years old who lived in Chollabuk-Do province. The results showed that first, there was no significant difference in the level of total self-differentiation between husbands and wives. While the level of mental health(depression, somatization) were higher for wives than for husbands. Second, both husbands' and wives' mental health were negatively correlated with self-differentiation. Finally, results of multiple regression analyses showed that both husbands' and wives' mental health were negatively influenced by self-differentiation. Specifically, the variable significant affecting the husbands' mental health was the emotional reactivity of self-differentiation and the variable significant wives' mental health was the emotional cut-off of self-differentiation. These findings confirmed the concept of self-differentiation in applying to mental health of elderly couples.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.2207-2216
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• 2014

The purposes of this study were to investigate self-assertiveness, self-esteem, depression and abnormal eating attitudes among female university students with weight control experience and to identify the factors that influence abnormal eating attitudes. Data were collected through self reported structured questionnaire form 170 Korean female university students by convenient sampling methods form May 1 to June 30, 2013. A multiple linear regression showed that depression(${\beta}$=0.20, p=.029) was identified as significant predictors of self control of eating and bulimic symptom. Self-esteem(${\beta}$=-0.22 p=.019) and depression(${\beta}$=0.18, p=.043) were identified as significant predictors of food preoccupation. Self-esteem(${\beta}$=-0.35, p<.001) was identified as significant predictors of preoccupation with being thinner. Self-assertiveness(${\beta}$=0.22, p=.008) and depression(${\beta}$=0.20, p=.034) were identified as significant predictors of preoccupation for dieting. Therefore, for implement the healthy weight control and reducing abnormal eating attitudes, as a strategy for improving self-esteem and self-expressiveness and controlling depression, psychological and mental nursing intervention will be needed.

• Industry Promotion Research
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• v.7 no.4
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• pp.45-52
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• 2022

Based on the Kohut's theory, this study carries out an investigation into the counselor's self object role in pathological narcissism. The theological understandings deal with narcissism, pathology, and self object. Narcissism and pathology can be seen as the failure of the formation of cohesive self. Early infant self, by feeling proper sympathy and love, usually forms integrated cohesive self. In other words, narcissistic personalities, when failing to receive sympathy and accommodation, can result in forming helpless and vulnerable self, which is filled with resentment. In addition, narcissistic characters are afraid of the world and maintain the grandiose image of self to protect themselves from feeling helplessness and emptiness. On the other hand, when they experience accommodation and admiration provided by self object, they can strengthen the image of grandiose self and demonstrate creative abilities as well. An infant remains as a fragmented self, when his or her relationship experience with self object is to be damaged. This study suggests the following conclusions: The counselor's self object role for pathological narcissism should be sympathetic self object so that the counselee will be able to form his or her own healthy cohesive self. Additionally, self object should play a kind role to guide infant desires for ideal models, which eventually help infants to pursue healthy ideas and maintain early states of narcissistic balances.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4489-4493
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• 2014

LED light driving device has problems in efficiency and heating at higher than 150W. In addition, there is inconvenience in replacing the lighting device to another when W is not the same as the previous one. In this paper, a multi-channel LED light driver, driver embedded driver circuit in a multi-channel structure with a power system in the driver-interlocking structure was designed. With the auto control converter structure with a power efficiency above 93% and power factor above 0.98, the weight of the high efficiency LED lighting-actuating device in driver-interlocking structure, a driver in self-calibrating self-optimization structure. In this paper, at below 10% THD, the existing converter contrast weight was reduced by 40% or more.