• Journal of the Korean Data and Information Science Society
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• 제24권4호
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• pp.919-929
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• 2013

We compared two basic methods, combine-accumulate method and accumulate-combine method, using the past quality information in multivariate quality control procedure for monitoring mean vector of multivariate normal process. When small or moderate shifts have occurred, accumulate-combine method yields smaller average run length (ARL) and average time to signal (ATS) than combine-accumulate method. On the other hand, we have found from our numerical results that combine-accumulate method has better performances in terms of switching behavior than accumulate-combine method. In industry, a quality engineer could select one of the two method under the comprehensive consideration about the required time to signal, switching behavior, and other physical factors in the production process.

• 한국해양공학회지
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• 제15권2호
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• pp.33-38
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• 2001

The subsidence characteristics of artificial reef (AFR) in the unsteady flow such as tidal flow were investigated. The scour and subsidence characteristics were confirmed in the steady flow field. In a main study, the interaction of "Flow - Sediment Movement - Structure Behavior" and scou $r_sidence mechanism were discussed int he unsteady flow field. AFR subsidence characteristics was discussed with Reynolds number(Re*), Shields number(Sn*), dimensionless acceleration of flow (af/g) and dimensionless time (t/T). Most of all, the continuous AFR subsidence from the scour was occurred by periodic behavior of AFR. This behavior is result from the asymmetric ground, and is influenced by maximum velocity, duration time and direction of flow.ow.

• 한국해양공학회지
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• 제14권1호
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• pp.60-66
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• 2000

In order to study for corrosion behavior of reinforcing steel with oxidation layer. Experiments were done with various NaCl concentrations and with immersion time in simulated concrete pore solution(SPS) the characteristics of corrosion behavior were measured by polarization resistance method and cyclic potentiodynamic method. reinforcements were coated by epoxy except corrosion without oxidation layer and it also showed two anodic-nose. by the result of potention dynamic test the potential curve shift to low with time and anodic-nose was appeared with 3% NaCl solution after 15 days. By result of cyclic Potentiodynamic test the type of corrosion was different accoding to concentration.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.33-36
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• 2006

The purpose of this paper is to investigate the structural behavior of fire damaged high-strength SRC columns with polypropylene fiber. When high-strength concrete is exposed to high temperature, spalling is occurred then it leads to decrease the capacity of members. Polypropylene fiber is used to reduce the spalling of the specimens and the distinction in the behavior after fire is observed. High-strength concrete specimens were exposed to high temperatures by the ISO 834 curve. Main experimental parameters were the ratio of the contained polypropylene fiver, heating time and type of loading. Reduction rate in residual strength and stiffness is observed for the mixing of PP fiber, the heating time and eccentricity of loading.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 추계 학술발표회 제16권2호
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• pp.643-646
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• 2004

The posttensioning system of nuclear containment have to be verified its structural integrity by the periodic inspection because the structural behavior of the containment is changed by the variation of the physical property of concrete and tendon as time passes. In this study a program 'SAPONC-CANDU' which is able to monitor and analysis the micro structural behavior of the domestic CANDU type containment at all times was developed. The readings of vibrating-wire strain gauges embedded into the concrete of containment were used as input data for operating the program. This program provides the long-term prediction values and bands of the concrete strain due to the time dependent factors of the concrete and tendon of the domestic CANDU type containment.

• 한국전자통신학회논문지
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• 제11권6호
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• pp.645-652
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• 2016

본 논문은 몸과 마음으로 표시할 수 있는 기본적인 몸과 마음의 방정식을 로미오와 줄리엣에 기반한 사랑 모델을 적용하고 외력은 인가한 상태에서 심신일여의 체육사상의 타당성을 검증하기 위하여 몸과 마음이 하나인 심신일원론과 몸과 마음이 나누어지는 심신이원론의 비선형 거동에 대하여 시계열과 위상 공간으로 나타내고, 이들 사이의 차이점을 확인한다.

• Earthquakes and Structures
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• 제3권3_4호
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• pp.249-270
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• 2012

This paper investigates the effectiveness of widely used identification methods to identify the response of seismically isolated structures supported on bearings with bilinear behavior. The paper shows that while both time domain and frequency domain methods predict with high accuracy the modal characteristics of structures isolated by linear isolation system, their performance degrades appreciably when the isolation system exhibits bilinear behavior even when its strength assumes moderate values (say 5% of the weight). The paper also shows that the natural period of isolated structure that results from bilinear isolation systems can be satisfactorily predicted with wavelet analysis.

• 한국수소및신에너지학회논문집
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• 제32권5호
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• pp.340-346
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• 2021

The initial electrochemical performance of ceramic fuel cell with thin-film electrolyte fabricated by plasma-enhanced atomic layer deposition method was evaluated in terms of peak power density ratio, open circuit voltage ratio, and activation/ohmic resistance ratios at 500℃. Hydrogen and air were used as anode fuel and cathode fuel, respectively. The peak power density ratio reduced as ~52% for 30 min, which continually decreased as time increased but degradation rate gradually decreased. The open circuit voltage ratio decreased with respect time; however, its behavior was evidently different from the reduction behavior of the peak power density. The activation resistance ratio increased as ~127% for 30 min, which was almost similar with the reduction behavior of the peak power density ratio.

• 유통과학연구
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• 제16권6호
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• pp.65-75
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• 2018

Purpose - The exhibition is one of the critical distribution channels that leads to mass sales of products. Servicescape is considered as an effective means facilitating consumers' purchasing behavior. The objective of this research is to examine the effects of servicescape of the exhibition on consumer's purchasing behavior measured by time spent, the number of consultations, the number of items purchased, and amount of money spent. Research design, data, and methodology - Servicescape was divided into four main components: 'spatial layout/functionality', 'ambient condition', 'design/artifacts', and 'human factor'. Based on previous studies, this study hypothesized that servicescape dimensions first influence consumer's shopping duration and the number of consultations which in turn, affects consumer's actual purchase. A total of 407 samples were collected from attendees in Baby Expo taken place in Kyunggido, South Korea. The data were used to assess overall fit of the proposed model and test hypotheses using structural equation modeling. All the constructs had acceptable levels of composite reliability and convergent and discriminant validity. Results - The results showed that except for 'spatial layout/functionality', all components of servicescape had a significant influence on consumer's shopping duration in the exhibition. Except for 'design/artifacts', other factors of servicescape did not show a significant effect on 'the number of consultations'. Interestingly, 'design/artifacts' exerted a significant negative effect on 'the number of consultations'. As expected, 'time spent' and 'number of consultations' showed significant effects on both 'the number of items purchased' and 'amount of money spent'. Conclusions - The results offer some insights into the effect of servicescape on facilitating consumers' purchasing behavior in the context of the exhibition. Theoretically, this study provides a new type of conceptual framework that verifies the relationships between not only servicescape and purchasing behavior, but also purchasing behavior-related variables. In addition, this study supports the concept of a dark side of servicescape. With regards to practical implications, this study suggests that exhibition organizers should put more efforts in facilitating consumer's desire to stay. More importantly, organizers need to keep in mind that excessive emphasis on 'design/artifacts' to increase consumers' shopping duration can cause a side effect that reduces opportunities for interactions with customers.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제25권4호
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• pp.217-223
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• 2014

Objectives : This study was conducted in order to investigate the influence of sexual trauma on the psychopathology and quality of life of children and adolescents in Korea. Methods : Twenty-seven children and adolescents and their caretakers who visited the Kangwon Sunflower Center participated in a cross-sectional study. Participants completed the Korean version of Kiddie-Schedule for Affective Disorders and Schizophrenia-Present and Lifetime Version, Child Behavior Checklist (CBCL), and Child Health Questionnaire-Parent Form-50 (CHQ-PF-50). Their scores were compared with those of a age and sex-matched control group of 27 healthy children and adolescents. Results : Victims of sexual violence showed higher t score in Withdrawn, Social problems, Delinquent behavior, Externalizing problems, and Total problems in CBCL, compared with control group. In CHQ-PF-50, there were lower scores on Bodily pain/discomfort, Behavior, Mental health, Time impact in parents, and Family activities subscales in victims of sexual violence. While Behavior and Family activities subscale showed negative correlations with Delinquent behavior, Externalizing problems, and Total problems in CBCL. Mental health subscale showed negative correlations with Social problems, Delinquent behavior, Externalizing problems, and Total problems. In addition, Time impact on parent subscale showed a negative association with Delinquent behavior in CBCL. Conclusion : The current study provided evidence suggesting that victims of sexual violence had a higher level of psychopathology and lower level of quality of life.