• Human Ecology Research
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• 제58권1호
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• pp.61-74
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• 2020

This study examined the effects of moral disengagement (cognitive restructuring and blaming the victim) and self-control on cyberbullying perpetration and investigated if self-control moderated the relationship between moral disengagement (cognitive restructuring and blaming the victim) and cyberbullying perpetration. Participants in the study consisted of 551 middle school students (273 boys and 278 girls) from five middle schools in Seoul and Gyeonggi-do. Cyberbullying perpetration, moral disengagement and self-control were measured using the Bullying/Victimization Questionnaire, the Mechanisms of Moral Disengagement Scale, and the Self-Control Scale for children and adolescents. Data were analyzed by means of descriptive statistics and a hierarchical regression analysis. The moderating effect of self-control was analyzed using procedures proposed by Baron and Kenny (1986). The results indicated that both levels of cognitive restructuring and blaming the victim increased cyberbullying perpetration whereas the level of self-control decreased cyberbullying perpetration. In addition, self-control moderated the effect of cognitive restructuring on cyberbullying perpetration. The influence of cognitive restructuring on cyberbullying perpetration was greater when the level of self-control was low, compared to when it was high.

• 한국콘텐츠학회논문지
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• 제16권4호
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• pp.132-143
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• 2016

이 연구의 목적은 청소년의 자기통제력이 교사애착에 미치는 영향을 분석하는 것이며, 이때 청소년의 자아존중감과 자기신뢰감이 매개효과를 갖는지를 검증하는 것이다. 이를 위해 2010년도 한국청소년패널조사 중학교 2학년 6차년도 자료 중 설문에 응답한 2,854명의 자료를 구조방정식 모형으로 분석하였다. 주요 연구결과는 다음과 같다. 첫째, 청소년의 자기통제력은 교사애착에 정(+)의 유의한 영향을 미치는 것으로 나타났다. 이 때 청소년의 자기통제력은 간접효과와 직접효과, 총효과 모두 유의한 것으로 나타났다. 둘째, 청소년의 자아존중감과 자기신뢰감은, 청소년의 자기통제력이 교사애착에 정(+)의 유의한 영향을 미치는 과정에서 정(+)의 매개효과를 갖는 것으로 나타났다. 이러한 연구결과를 토대로 청소년의 자기통제력 훈련의 중요성을 제안하였다.

• 한국산학기술학회논문지
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• 제15권5호
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• pp.3069-3073
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• 2014

인터넷이 발달해가며 u-Health의 도입단계시기에 인터넷 건강정보의 가장 민감한 세대인 대학생들을 대상으로 인터넷 건강정보 이용효과에 관한 연구가 필요하다고 판단되어 대학생 300명을 대상으로 내 외적 건강컨트롤 소재에 따른 인터넷 건강정보 이용효과를 분석하였다. 그 결과 인터넷 건강정보의 이용효과가 건강에 대한 투자비용의 비율이 높을수록 B=.004로 증가, 내적 건강컨트롤이 높을수록 B=-.027로 감소, 외적 건강컨트롤이 높을수록 B=.037로 증가하였다. 건강에 대한 신념이 높은 내적 건강컨트롤이 높은 대학생일수록 인터넷 건강정보 이용효과가 감소하였고, 건강에 대해 외부 의존성향이 강한 외적 건강컨트롤이 높은 대학생일수록 인터넷 건강정보 이용효과가 증가하였다. 그러므로 인터넷 건강정보에 대한 신뢰성과 정확성 및 접근성을 높일 필요가 있다.

• 융합정보논문지
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• 제9권10호
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• pp.122-132
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• 2019

본 연구의 목적은 어머니의 양육행동이 유아의 공격성에 미치는 영향과 그 과정에서 유아의 자기통제력의 매개효과를 검증하는데 있다. 이를 위해 한국아동패널 7차년도 자료를 활용하여 만 5세 아동을 대상으로 본 연구에 부합하는 1,524명을 표본으로 추출하였다. 연구분석은 위계적 회귀분석 방법과 Sobel test를 활용하였으며, 다음과 같은 연구결과가 도출되었다. 첫째, 어머니의 온정적 양육행동은 유아의 공격성을 감소시키는 것으로 나타났지만, 어머니의 통제적 양육행동은 공격성에 영향을 미치지 않는 것으로 나타났다. 둘째. 유아의 자기통제력은 공격성에 부적인 영향을 미치는 것으로 나타났다. 셋째, 어머니의 온정적 양육행동과 유아의 공격성의 관계에서 자기통제력의 부분매개효과가 나타났다. 이러한 연구결과를 토대로 유아의 공격성을 낮추기 위한 다양한 프로그램의 개발과 보육현장에서의 실천적 대안을 제시하였다.

• Human Ecology Research
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• 제57권3호
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• pp.431-444
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• 2019

This study explored the longitudinal developmental paths of preschooler's external problem behaviors from infancy. Subjects consisted of 205 preschoolers (106 boys, 99 girls aged 4) and their mothers recruited for the 2009 in-depth Panel Study on Korean Children. Data were analyzed by descriptive statistics, correlations, and structural equation modeling using SPSS 18.0 (SPSS Co., Chicago, IL, USA), Amos 18.0 (SPSS Co., Chicago, IL, USA). The results were as follows: Maternal depression at preschooler's age 0 had a direct effect on maternal social parenting style at preschooler's age 0. Maternal social parenting style at preschooler's age 0 had a direct effect on preschooler's effortful control at age 1. Preschooler's effortful control at age 1 had a direct effect on preschooler's external problem behaviors at age 4. Marital conflict at preschooler's age 0 did not have a direct effect on preschooler's effortful control at age 1. The direct effects of maternal depression at preschooler's age 0 on preschooler's effortful control at age 1, and on preschooler's external problem behaviors at age 4 were not significant. In addition, direct effect of maternal social parenting style at preschooler's age 0 on preschooler's external problem behaviors at age 4 was not significant. This study showed that maternal psychological characteristics, marital conflict, maternal social parenting style and preschooler's effortful control in infancy should be considered simultaneously to explain the effect on preschooler's external problem behaviors.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
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• pp.140-143
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• 2000

Motion control system using motor generally consists of 2 inertio system, motor inertio and load inertio linked with flexible coupling. In the case of direct drive motor control, the effect of coupling inertio decrease the precision performance. The study is about semiclosed control scheme of the system and experimental setup. To compensate the effect of coupling inertio, semiclosed control system by disturbance observer is employed. The simulation result is shown.

• 대한한방소아과학회지
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• 제19권2호
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• pp.215-228
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• 2005

Objective : The study was aimed to evaluate the anti-stress effect of KYT on the cold-stressed Mice. Methods: The experimental animals were stressed in cold room $(4{\pm}0.5^{\circ}C)$ for one hour in a day during two weeks, and administred 131mg/100g KYT extract for two weeks before stress. For two weeks, while the experiment was taking place, we conducted a research about the change of weight and content of norepinephrine, epinephrine, dopamine, cortisol and GOT, GPT in the mice serum. Results : KYT extract significantly inhibited the decrease of body weight induced by stress, compared with the control group. KYT extract had no significant decreasing effect on the change of content of the serum GOT but had significant decreasing effect on the change of content of the serum GPT compared with the control group. KYT extract had significant decreasing effect on the change of content of the serum cortisol compared with the control group. KYT extract had decreasing effect on the change of content of the serum dopamine compared with the control group. KYT extract had no decreasing effect on the change of content of the serum norepinephrine compared with the control group. KYT extract had significant decreasing effect on the change of content of the serum epinephrine compared with the control group. Conclusions : According to the above results, it is concluded that KYT will be useful as a preventive and remedy against stress disease.

• 한국환경보건학회지
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• 제35권5호
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• pp.417-425
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• 2009

The purpose of this study was to investigate the whitening effect of Angelicae dahuricae Radix water extract (ADWE) by its application on artificial tanning spots which were induced by 1,500 $mJ/cm^2$ of UVB radiation on the backs of brown guinea pigs weighing approximately 450~500 g. Thirty ${\mu}l$ of ADWE, at each application, were applied twice a day, 5 days a week, for 8 weeks to the guinea pigs. The artificial tanning spots were divided into 3 groups which were vehicle control group [propylene glycol: ethanol: water (5:3:2)], positive control group (2% hydroquinone) and experimental group (2% ADWE). The visible whitening effect and changes in melanin index were evaluated once a week. On completion of the experiment, the animals were sacrificed under anesthetization, and the artificial tanning spots were excised by biopsy punch and stained with Hematoxylin and Eosin (H&E) to observe histological change and also stained with Fontana-Masson's silver (F-M) and S-100 to observe melanin pigmentation and melanocytes. In the gross observation, the experimental group showed higher pigmentation than the positive control group but lower pigmentation than the vehicle control group. Histological observation confirmed that ADWE had a positive whitening effect by showing a lower distribution of melanin and melanocytes in the epidermis of experimental group than in the vehicle control group.

• 성인간호학회지
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• 제24권2호
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• pp.119-129
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• 2012

Purpose: The purpose of this study was to test hand hygiene behavior model of hospital nurses, based on theory of planned behavior. Methods: Data were collected from 253 nurses from four university hospitals for the period of December 2010 to January 2011. Data were analyzed using of SAS (ver.9.1). Fitness of the study model was identified with SAS PROC CALIS. Results: The overall fitness was $x^2$=57.81 (df=13, $p$ <.001), GFI=.99, AGFI=.99, CFI=.95, NFI=.93. The variance of actual implementation of hand hygiene by predictor variables was 11.0% and the variance of intention to hand hygiene was 53.5%. Variable that had a direct effect on hand hygiene behavior was intention. Perceived behavior control and attitude affected hand hygiene behavior indirectly. Control belief had a direct effect on perceived behavior control and had an indirect effect on intention and behavior. Behavioral belief had a direct effect on attitude and an indirect effect on intention and behavior. Conclusion: The study provides basic information for understanding nurses' hand hygiene behavior. Further testing of the model will indicate which variables can contribute to improved hand hygiene.

• International Journal of Naval Architecture and Ocean Engineering
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• 제11권1호
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• pp.606-623
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• 2019

The path following problem of a ship sailing in restricted waters under wind effect is investigated based on Robust $H_{\infty}$ Guaranteed Cost Control (RHGCC). To design the controller, the ship maneuvering motion is modeled as a linear uncertain system with norm-bounded time-varying parametric uncertainty. To counteract the bank and wind effects, the integral of path error is augmented to the original system. Based on the extended linear uncertain system, sufficient conditions for existence of the RHGCC are given. To obtain an optimal robust $H_{\infty}$ guaranteed cost control law, a convex optimization problem with Linear Matrix Inequality (LMI) constraints is formulated, which minimizes the guaranteed cost of the close-loop system and mitigates the effect of external disturbance on the performance output. Numerical simulations have confirmed the effectiveness and robustness of the proposed control strategy for the path following goal of a ship sailing in restricted waters under wind effect.