• Journal of the Earthquake Engineering Society of Korea
• /
• v.8 no.4
• /
• pp.51-62
• /
• 2004

Fuzzy supervisory control technique for the seismic response control of cable-stayed bridges subject to earthquakes is studied. The proposed technique is a hybrid control method, which adopts a hierarchical structure consisting of several sub-controllers and a fuzzy supervisor. Sub-controllers are independently designed to reduced the responses to be controlled of a cable-stayed bridge, and a fuzzy supervisor achieves improved seismic control performance by tuning the pre-designed sub-controllers. It is realized by converting static gains of the sub-controllers into time-varying dynamic gains through the fuzzy inference mechanism. To evaluate the feasibility of the proposed technique, the benchmark control problem of cable-stayed bridge proposed by Dyke et al. is adopted. The control variables for the seismic response control of the cable-stayed bridge are determined to be t도 shear forces and bending moments at the base of the towers, the longitudinal displacements at the top of the towers, the relative displacements between the deck and the tower, and the tensions in the stay cables. Comparative results between the fuzzy supervisory controller and LQG controller demonstrate the effectiveness of the proposed control technique.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.44 no.11
• /
• pp.74-81
• /
• 2007

In this paper, CMOS analog-to-digital converter (ADC) with a 6-bit 1GSPS at 1.8V is described. The architecture of the proposed ADC is based on a folding type ADC using resistive interpolation technique for low power consumption. To reduce the power consumption, a folder reduction technique to decrease the number of folding blocks (NFB) by half of the conventional ones is proposed. further, a novel layout technique is introduced for compact area. With the clock speed of 1GSPS, the ADC achieves an effective resolution bandwidth (ERBW) of 500MHz, while consuming only 60mW of power. The measured INL and DNL were within $\pm$0.5 LSB, $\pm$0.7 LSB, respectively. The measured SNR was 34.1dB, when the Fin=100MHz at Fs=300MHz. The active chip occupies an area of 0.27$mm^2$ in 0.18um CMOS technology.

• Korean Journal of Childcare and Education
• /
• v.11 no.4
• /
• pp.1-17
• /
• 2015

The purpose of this study is to investigate the relationship between peer interaction, self-regulation and leadership of young children, and examine the mediating effect of self-regulation ability in the effect of peer interaction on the leadership of young children. The subjects of the study were 211 children aged 4 to 5 who attended in child education institutes in the Seoul-Incheon area. A survey was conducted on teachers who worked in kindergartens and day care centers with questionnaires, and the collected data were analyzed. For data analysis, SPSS WIN 21 program was used to calculate mean, standard deviation, skewness, and kurtosis, and correlation analysis was conducted. Also, the structural equation model was validated using Amos 21, and the following results were obtained. First, the positive peer interaction, self-regulation and leadership of children were positively associated. Second, the peer interaction did not have a significant effect on the leadership of young children, and the self-regulation of young children had a positive effect on the leadership of young children. It was found that peer interaction had a positive effect on the self-regulation of young children, and in the relationship of effects on the leadership of young children, the self-regulation was found to play a role of significant mediating effect. Such results are remarkable elements in leadership education for young children, implying the importance of peer interaction and self-regulation of young children.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.9
• /
• pp.395-402
• /
• 2017

This study examinedthe adaptive flexibility of North Korean adolescent defectors in order to examine how they should see themselves and cope with various situations, and analyzedthe effect of their resilience on their self-esteem and social problem-solving ability. The study subjects were 223 North Korean adolescents (10 - 25 year olds) living in South Korea. Data analysis was conducted using SPSS 23.0 and AMOS 23.0 statistical programs. The study results showed that the resilience of North Korean adolescents had a statistically significant effect on their self-esteem and social problem-solving ability. In particular, resilience had a high correlation with self-esteem, and self-esteem had a high correlation with social problem solving ability. In addition, self-esteem was the mediating factor between resilience and social problem-solving ability. The self-esteem of North Korean adolescent defectors played a particularly important role. Therefore, professional protection and support should be provided with the help of related experts such as youth leaders and counselors who would be able to enhance the self-esteem of North Korean adolescent defectors.

• The Journal of the Korea Contents Association
• /
• v.16 no.8
• /
• pp.448-461
• /
• 2016

The purpose of this study was to investigate the mediating effects of problem-drinking and self-esteem on the relationship between coping strategies of family conflict and family violence. The subjects were conflicted by family among baby boomers were selected in the 9th KoWePS. and are analyzed with the statistical program AMOS 21.0 as a calling structural equation modeling and also with aroian test for mediating effect. The major findings were as follows: 1st, positive coping strategies of family conflict was negative related to problem-drinking. 2nd, positive coping strategies of family conflict was positive related to self-esteem. 3rd, positive coping strategies of family conflict was negative related to family violence. 4th, mitigated problem-drinking was insignificantly related to family violence. 5th, reinforced self-esteem were negative related to family violence. Finally, on the base of this results, the practical and political implications of this study were discussed to recover family conflict and to reduce and protect family violence. and the limitations of this study and the suggestions for future studies were also presented.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.7
• /
• pp.4960-4968
• /
• 2015

In this study to improve the chloride durability of the shotcrete structure depending on types and contents of mineral admixture chloride resistance was evaluated by NT BUILD 492 of european test standards. It was also evaluated with the mechanical properties such as static strength and chloride penetration resistance. For shotcrete mixed crushed stone aggregate of the maximum size 10mm of coarse aggregates was produced. Based on 28days compression strength the variable mixed with 15% silica fume showed the highest strength in 67.55MPa. As the content of fly ash and blast furnace slag increased, the strength lowered. In the chloride penetration resistance test, OPC showed "high grade" and In the case of admixture, the penetration resistance tended to increase in all variables except the fly ash. In order to evaluate the service life, the accelerated chloride penetration test was conducted by the standards of KCL, ACI, FIB. Test results were obtained with the lowest spreading factor in a variable mixed with silica fume of 15%. At the KCI standards, It was found to have a service life of about 65 years and at the FIB standards, It was found to have a service life of 131 years. Among standards, the service life of KCI standard in all of the variables was evaluated as the lowest.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.6
• /
• pp.166-172
• /
• 2016

This paper deals with the seismic qualification of the reflective metal insulation for thermal shielding that is installed on the outer surfaces of the main equipment of the primary coolant system of a nuclear power plant. A small-scale model of the reactor pressure vessel, which has equivalent dynamic characteristics, was designed to be tested in domestic seismic testing facilities in the future. In this study, seismic analysis of the small-scale model installed with metal insulation was performed using equivalent static analysis and response spectrum analysis. The required Response Spectrum for main equipment of the primary coolant system of APR-1400 plant were considered to establish the enveloping response spectrum, which was applied to the seismic analysis model. The results from two seismic analysis methods were compared to show the structural adequacy of the metal insulator design against a safe shutdown earthquake. This study will form the basis for the seismic testing to support the seismic qualification of the reflective metal insulator.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.38 no.4
• /
• pp.567-578
• /
• 2018

In this study, to investigate the effect of the stress reduction of group piles by dynamic loading, a dynamic p-y curve was established and the dynamic p-multiplier was calculated. Dynamic numerical analysis was performed by input sinusoidal waves to the bottom of the pile - ground system for $2{\times}2$ group pile, single pile and $5{\times}5$ group pile, single pile in dry sandy soil, and the pile spacing was changed to 2.5 and 5.0 times of the pile diameter. By establishing and comparing the dynamic p-y curves of the single pile and group piles, the dynamic group pile effect of the piles according to the pile center spacing and row position of the group pile piles is analyzed. $5{\times}5$ showed symmetry of the dynamic P-multiplier value around the pile origin coordinate. The dynamic p-multiplier value at the single pile, $5{\times}5$ pile (pile spacing: 2.5D) is 0.26 ~ 0.30 at the pile number 3, pile number 23, 0.14 pile number 13, and 0.14 ~ 0.38 at the pile number 5, pile number 18. These values differed from the static p-multiplier, especially due to the different loading conditions. The dynamic p-multiplier ($P_{dm}$) estimation through various types of input dynamic loads is expected to be used for dynamic design and analysis of group pile-ground systems of civil foundation structures.

• Korean Journal of Psychosomatic Medicine
• /
• v.11 no.1
• /
• pp.60-68
• /
• 2003

Objectives: The purpose of this study was to develop a Korean version of the Levels of Emotional Awareness Scale(LEAS-K) and to examine its validity and reliability. Methods: LEAS-K was developed from translating original LEAS into Korean. The subjects were 476 Korean medical students(322 males and 154 females). The internal consistency was evaluated with the Cronbach's alpha coefficients and 40 protocols were independently scored by two raters to confirm interrater reliability. Additionally, a Korean version of 20-item Toronto Alexithymia Scale(TAS-20K), Korean versions of the Openness to Experience Inventory(OE), the Marlowe-Crowne Scale (MCS), the Bendig short form of the Taylor Manifest Anxiety Scale(TMAS) and the Emotional Expressivity Scale(EES) were rated to evaluate concurrent validity. Results: The internal consistency measured by Cronbach's alpha was 0.81 and interrater reliability was high{r(40)=0.99}. Correlation coefficients for concurrent validity were nonsignificant with TMAS and EES. LEAS-K correlated significantly with TAS-20K{r(476)=-0.10, p<0.05}, OE {r(476)=0.10, p<0.05} and MCS {r(476)=0.10, p<0.05}. Conclusion: LEAS-K was demonstrated to have high reliability and validity.

• The Journal of the Korea Contents Association
• /
• v.11 no.7
• /
• pp.406-417
• /
• 2011

The purpose of this paper is to examine the effects of computer/internet game play on depression and life satisfaction via perceived self-control among older adults in Korea. Data were collected from a survey of 237 community-dwelling older adults (age${\geq}$65) who reported internet users. A path analysis was used to examine the causal relationship among the main constructs. Results showed that the computer/internet game play had positive effects on perceived self-control. Perceived self-control was found to decrease depression and improve life satisfaction among older adults. Additional analysis indicated that the computer/internet game play in older adults did not directly affect mental health (depression and life satisfaction) but indirectly affected it via perceived self-control. Furthermore, perceived self-control had greater effects on depression than on life satisfaction. These findings have crucial implications in that perceived sense of self-control needs to be seriously considered when we develop mental health games for older adults.