• 대한토목학회논문집
• /
• 제31권5B호
• /
• pp.415-429
• /
• 2011

현재 국내에서 주로 사용되고 있는 홍수기 다목적댐의 홍수조절효과에 대한 정량적인 평가지표로는 유량조절률, 저수지 방류율, 저수지 저류율, 저수지 이용률 등이 있다. 이러한 평가지표들은 유입량, 방류량, 저류량 등의 자료를 단순 비교하는 방법을 사용하고 있는데, 홍수조절효과 평가지표 산정식에 사용되는 자료들이 가지는 불확실성이 평가에 고려되지 못하고 있으며, 저수지에서 얻을 수 있는 자료만을 사용하기 때문에 저수지 하류 지점에서의 홍수조절효과를 적절히 평가하지 못하고 있다. 또한 이러한 지표들은 수자원 시스템의 설계에 있어서 허용 가능한 부분적인 실패를 고려하지 못하는 등의 문제점이 존재하므로, 홍수조절효과를 정량화 할 수 있는 새로운 지표의 개발이 요구된다. 본 연구에서는 각종 변수들이 가지는 불확실성, 댐 하류지점에서의 홍수조절효과, 수자원 시스템에서 허용 가능한 부분적 실패를 고려하기 위하여 홍수조절효과 정량화 지표 개발에 fuzzy 집합이론을 적용하였다. 본 연구를 통해 개발한 홍수조절효과 정량화 지표를 이용하여 다목적댐의 홍수조절효과를 평가하였다. 연구 대상 유역으로는 충주댐 유역을 선정하였고, 대상 홍수 사상으로는 2006년 7월의 홍수사상을 적용하였다. 개발한 홍수조절효과 정량화 지표를 이용하여 홍수조절효과를 평가하기 위해 관련 인자들을 퍼지화하고 시스템의 상태로부터 허용 가능한 부분적인 실패 영역을 구분하여 홍수조절효과 정량화 지표를 산정하였다. 적용결과, 본 연구를 통하여 개발된 통합 신뢰도-취약도 지수는 저수지의 홍수조절효과를 기존의 지표보다 구체적이고 객관화하여 나타낼 수 있었다.

• 가정과삶의질연구
• /
• 제29권3호
• /
• pp.59-69
• /
• 2011

The purpose of this study was to investigate the structural relationships among adolescents' internet addiction, self-esteem, self-control, and aggression. The participants were 300 students in their first year of middle school. The questionnaire consisted of measures of internet addiction, self-esteem, self-control, and aggression. The major findings were as follows: 1) self-control had a direct effect on aggression; 2) internet addiction had a direct effect on self-esteem and self-control; 3) self-esteem had a direct effect on self-control; 4) internet addiction had an indirect effect on aggression and self-control; and self-esteem had an indirect effect on aggression. This study implied that self-related variables could mediate the relationship between the possibility of internet addiction and adolescents' aggression. This study also suggested that research on various mediator variables could reduce adolescents' psychosocial problems.

• 아동학회지
• /
• 제35권4호
• /
• pp.145-165
• /
• 2014

The main purpose of this study was to examine the relationships between marital conflict, parental control and children's depression. The participants were composed of 243 elementary school 5th and 6th graders (of which 121 were boys and 122 were girls) from Gyeonggi-do province. They completed questionnaires on marital conflict, parental control and children's depression. The data were analyzed by means of Pearson's correlation coefficients and multiple regression analysis. It was observed that marital conflict (content) had an effect on children's depression. Parental psychological control was also found to have an effect on children's depression. However, parental behavioral control did not appear to have an effect on children's depression. In addition marital conflict (frequency/content) had an effect on parental psychological control. Additionally, marital conflict (resolution) had an effect on parental behavioral control. It was further found that paternal psychological control and maternal psychological control partially mediated the relationship between marital conflict and children's depression. These results clearly indicate that parental psychological control plays an important role in marital conflict and children's depression.

• International journal of advanced smart convergence
• /
• 제10권2호
• /
• pp.31-36
• /
• 2021

This study aims to provide basic data on establishing online learning by identifying the effects of self-efficacy as a medium on factors affecting self-control according to self-determination motivation through contactless online learning due to Covid-19. The research method used SPSS 25 and Sobel test to examine the causal relationship between the spokesmen and 196 middle and high school students in W-city, Gangwon-do. Self-determination motivation has had a significant effect on self-efficacy and self-control, and self-efficacy has been shown to have a significant effect on self-control. Also, Self-efficacy had a partial mediating effect on self-determination motivation affecting self-control. Based on this, fundamental and continuous development of online education programs to promote self-control of online learners is required, and efforts should be made to support learners' capabilities through psychological counseling.

• 농업과학연구
• /
• 제37권3호
• /
• pp.361-365
• /
• 2010

For the development of more effective insecticides for aphids, including the cotton aphid, Aphis gossypii Glover, control released insecticides were developed and tested as new type of formulation for the cotton aphid. Etofenprox is a target-of-control-released formulation that is toxic to insects with piercing-sucking type mouths including aphids and hoppers. The insecticidal effect of etofenprox is distinguished among others; however, continuance period of the effect of insecticide is shorter than other insecticides. In addition, the control effect of control released etofenprox on the cotton aphid was examined. The results show that control released etofenprox induced no control effects to the cotton aphid within 5 days of treatment. The cotton aphid's population was increased, and their reproduction rate was also high. However, control effect was shown to have very low levels 7 days after treatment, and it increased to higher effect. It is supposed that it is possible to control the cotton aphid using the type of control released etofenprox with a kitosan carrier. It is necessary to develop a more effective carrier type to release more of the insecticidal ingredient on the leaf after spraying.

• 문화기술의 융합
• /
• 제6권1호
• /
• pp.43-53
• /
• 2020

이 연구에서 우리는 아파트 세대 내에 화재발생 시 대피요령에 따른 화재의 불안요인을 낮추며 관리사무소의 관리역량이 안전의식 및 화재대응에 미치는 영향력에 대한 조절효과를 분석하였다. 연구결과는 첫째, 아파트 거주자의 안전의식 및 관리주체의 인식이 화재대응성과에 정(+)의 영향을 미치는 것으로 나타났다. 이는 아파트 거주자의 안전의식 및 관리주체의 인식수준이 높을수록 화재대응성과도 높아짐을 알 수 있다. 둘째, 관리사무소의 관리역량 수준이 높을수록 안전의식 및 관리주체의 인식이 화재대응성과에 정(+)의 영향을 미치는 것으로 나타났다. 이러한 결과는 관리사무소장의 리더십이 높을수록 아파트 거주자의 주거만족도도 높은 경향을 보이고 거주자와의 소통하는 자세가 높을수록 화재대응성과에도 긍정적인 영향이 있음을 의미한다. 마지막으로, 관리사무소 관리역량은 아파트거주자의 안전의식 및 관리주체의 인식수준이 화재대응성과에 미치는 영향을 조절하는 효과가 있는 것으로 분석되었다. 이러한 결과는 모형의 R² 값의 변화량이 1단계보다 2단계가 증가하였고 3단계에서는 조절변수의 상호작용 항을 추가함에 따라 단계적으로 증가하였다. 따라서 조절변수인 관리사무소 관리역량은 아파트거주자의 안전의식 및 관리주체의 인식수준이 화재대응성과에 미치는 영향을 조절하는 효과가 있는 것으로 분석되었다.

• 한국병원경영학회지
• /
• 제24권3호
• /
• pp.11-26
• /
• 2019

Objectives: The purpose of this study was to investigate the effect of the perception on the quality of nosocomial infection control on perceived risk, trust, and the intention to revisit among the medical consumers. Method: 361 patients and their guardians who were hospitalized in women's hospital, Gangnam-gu, Seoul, participated in this study. The data was analyzed using SPSS Statistics 21.0. Results: The perception on the quality of nosocomial infection control had a negative(-) effect on perceived risk, a positive(+) effect on trust, a positive(+) effect on the intention to revisit. The perceived risk had a negative(-) effect on trust, a negative(-) effect on the intention to revisit. The trust had a positive(+) effect on the intention to revisit. The perceived risk was partially mediated by the perception on the quality of nosocomial infection control and the intention to revisit, while the trust was fully mediated by the perception on the quality of nosocomial infection control and the intention to revisit. Thus, it indicated that the perceived risk and trust had dual mediated effects as well as full mediated effects in the relationship between the perception on the quality of nosocomial infection control and the intention to revisit. Conclusions: The nosocomial infection control can be an important factor to contribute to hospital management by attract the loyal medical customers, not just cost-expenditure. The nosocomial infection control can help hospital revenue and customer management strategy. Thus, it will contribute to the effective marketing strategy in the medical field.

• International Journal of Aeronautical and Space Sciences
• /
• 제15권3호
• /
• pp.293-301
• /
• 2014

We present a study of vertical dynamics control of an electrostatically levitated gyro-accelerometer considering the wobbling effect and propose a tilt stabilization method with newly introduced control electrodes. Typically, a rotor in a vacuum rotates at high velocity, which may create a drift rate and lead to displacement instability due to the tilt angle of the rotor. To analyze this, first we set up a vertical dynamic equation and determined simulation results regarding displacement control. After deriving an equation for drift dynamics, we analyzed the drift rate of the rotor and the wobbling effect for displacement control quantitatively. Then, we designed new sub-electrodes for moment control that will decrease the drift amplitude of wobbling dynamics. Finally, a simulation study demonstrated that the vertical displacement control with the wobbling compensation electrodes mitigated the rotor's drift rate, showing the effectiveness of the newly proposed control electrodes.

• Journal of Power Electronics
• /
• 제11권5호
• /
• pp.697-703
• /
• 2011

In this paper a control system with a high performance dynamic response for linear induction motors (LIMs) is proposed which takes into account the end-effect in both the machine model and the control system. Primary flux oriented control has two major drawbacks i.e. a lack of decoupling of the thrust and the flux and a possibility of system instability due to the end-effect. Both of these drawbacks have been dealt with in this paper. A flux estimation method is proposed to correct the flux orientation error caused by the end effect. Extensive motor performance evaluations under the proposed control system prove its superiority over conventional vector control.

• 대한물리의학회지
• /
• 제17권1호
• /
• pp.1-9
• /
• 2022

PURPOSE: This study examined the effects of ankle kinesio taping on the balanced control capabilities of normal adults, stroke patients, and musculoskeletal patients. METHODS: One thousand articles were searched, and 100 of them were selected as taping papers. Subsequently, 33 papers classified according to balance, muscle strength and pain were analyzed according to the effect size and age group. RESULTS: The effect of ankle kinesio taping on balance control was examined by dividing the effect size into three groups according to the type of disease. Studies with normal adults had a large effect size of 1.213, whereas the effect size of stroke studies was .377, which was small. Studies on musculoskeletal disorders had a large effect size of 1.429. All three groups did not include 0 in the 95% confidence interval, indicating a significant effect. CONCLUSION: The effect of kinesio taping on balance control was positive in all subjects, including normal adults, stroke patients, and musculoskeletal patients. On the other hand, in terms of the effect size of kinesio taping on balance control, musculoskeletal patients and normal adults had larger effect sizes than stroke patients.