• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(I)
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• pp.27-43
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• 2003

Reliability Lifecycle from Concept to In-Service Operation and Maintenance. Reliability management must consider - SAFETY - SERVICE REQUIREMENTS. Reliability targets/objectives can be specified at feasibility stage. Reliability analysis to support design process. Reliability assessment to support reliability growth or contractual demonstration. Maintenance optimisation to improve reliability during lifetime of operation. Lessons learnt incorporated into next generation of trains.

• International Journal of Advanced Culture Technology
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• 제7권1호
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• pp.49-57
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• 2019

The main purpose of the research is to examine impact of organizational justice and perceived organizational support on effectiveness of crime control in police organizations. This research employs a survey questionnaire to measure organizational justice, perceived organizational support, and effectiveness of crime control. The number of subject of the study is 285 police officers working in Daegu metropolitan city and some cities of Gyeongsangbuk-do province. The study employs regression analysis to analyze the effect of organizational justice and perceived organizational support on police performance. As the result of analysis, the effect of organizational justice on effectiveness of crime control is statistically significant at the level 0.01, perceived organizational support at the level 0.05. The key finding of this study is that in the performance-based management system, the reciprocal relationships between managers and individual officers with organizational justice and perceived organizational support play an important role in building a sustainable growth system in the police.

• 한국응용과학기술학회지
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• 제39권6호
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• pp.802-811
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• 2022

본 연구의 목적은 코로나19 시대 간호대학 신입생의 성장마인드셋, 교수지지, 학교생활적응의 관계를 확인하고, 학교생활적응에 영향을 미치는 요인을 파악하기 위한 서술적 연구이다. 연구 대상자는 G 광역시 소재 간호대학 신입생 248명으로 자료수집은 2022년 10월 4일에서 10월 31일까지 진행되었다. 수집된 자료는 SPSS/WIN 28.0 프로그램을 이용하여 기술통계, t-test, ANOVA, Pearson 상관계수, 다중회귀분석으로 분석하였다. 연구결과, 학교생활적응은 성장마인드셋(r=.51, p<.000), 교수지지(r=.54, p<.000)와 유의한 양의 상관관계가 있었다. 간호대학 신입생의 학교생활적응에 영향을 미치는 요인은 교수지지(β=.38, p<.001), 전공만족도에서 매우 만족이라고 답한 대상자(β=.31, p<.001), 성장마인드셋(β=.26, p<.001), 전공만족도에서 만족이라고 답한 대상자(β=.16, p=.015), 여학생(β=.14, p=.005) 순으로 나타났으며, 이들 요인은 학교생활적응을 44.0% 설명하였다. 이러한 연구결과는 간호대학 신입생의 학교생활적응을 증진시키는 전략을 개발하는데 유용하게 활용될 것이다. 향후 대상자를 확대하여 간호대학 신입생의 학교생활적응을 설명할 수 있는 후속 연구를 제언한다.

• 한국사회복지학
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• 제61권2호
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• pp.325-348
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• 2009

암은 우리나라의 사망원인 1위로, 환자뿐 아니라 가족의 삶에도 큰 영향을 미친다. 특히, 돌봄책임을 맡고 있는 가족원의 삶의 질은 사회적 지지, 돌봄 부담에 대한 평가, 재평가에 의해 영향을 받는다. 암환자 가족의 삶의 질을 향상시키기 위해서는 이들 요인들 간의 유기적인 관계를 밝혀 사회복지 실천 방법을 발전시킬 필요가 있다. 본 연구에서는 국립암센터를 이용하는 암환자 가족 295명의 사회적 지지, 돌봄 부담감, 내적 성장, 삶의 질을 파악하고, 이들 변수간의 관계를 구조방정식모형을 통해 검증하였다. 연구결과 첫째, 연구모형의 적합성을 검증하였을 때 적합도 지수가 CFI(.951), TLI(.940), RMSEA(.062)으로 좋은 적합도를 보였다. 둘째, 직접효과에 대한 검증결과 사회적 지지의 돌봄 부담감, 내적 성장에 대한 직접효과, 돌봄 부담감의 내적 성장, 삶의 질에 대한 직접효과, 내적 성장의 정신적 삶의 질에 대한 직접효과가 통계적으로 유의하였다. 셋째, 돌봄 부담감, 내적 성장의 매개효과에 대한 검증 결과, 사회적 지지가 삶의 질에 미치는 영향에 대한 돌봄 부담감의 매개효과, 사회적 지지와 돌봄 부담감이 정신적 삶의 질에 미치는 영향에 대한 내적 성장의 매개효과가 통계적으로 유의하였다. 이러한 결과에 따라 암환자 가족의 삶의 질에 영향을 미치는 사회적 지지, 돌봄부담, 내적성장간의 관계에 대하여 논의하고 사회복지 실천 및 연구를 위한 함의를 제언하였다.

• Carbon letters
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• 제14권4호
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• pp.228-233
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• 2013

In this work, we report in-situ observations of changes in catalyst morphology, and of growth termination of individual carbon nanotubes (CNTs), by complete loss of the catalyst particle attached to it. The observations strongly support the growth-termination mechanism of CNT forests or carpets by dynamic morphological evolution of catalyst particles induced by Ostwald ripening, and sub-surface diffusion. We show that in the tip-growth mode, as well as in the base-growth mode, the growth termination of CNT by dissolution of catalyst particles is plausible. This may allow the growth termination mechanism by evolution of catalyst morphology to be applicable to not only CNT forest growth, but also to other growth methods (for example, floating-catalyst chemical vapor deposition), which do not use any supporting layer or substrate beneath a catalyst layer.

• Journal of Korea Trade
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• 제25권7호
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• pp.75-91
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• 2021

Purpose - Social commerce (SC) is the growth of social media highlighting the e-commerce transactions and currently, the greatest challenges of e-commerce have attracted the influence of trust in social commerce intention (SCI). Based on the challenge, the study's purpose is to discover the effect of social support (informational and emotional support) on the SCI. The study also explores the mediation effect of trust and the moderation impact of culture between the USA and Korea. Design/methodology - This study used a sample of 482 surveys filled out by online shoppers from the US and Korea, two countries with divergent cultural values. Structural equation modelling (SEM) is used to analyze the hypothetical paths. In addition, bootstrapping and multi-group analysis are perform to view mediation and moderation effects respectively. Findings - The results of our study shows that both informational and emotional support significantly influences trust and SCI. Our results also supports the mediating effect of trust in social support and the moderating effect of culture in forming SCI. Originality/value - Our empirical results provide important information to businesses formulating cross-cultural SC strategies. This will help SC companies to analyze the aspects of customer trust through social support, which in turn will increase SCI and thereby established a competitive position for SCs. Our results will also be holistic directions for SC vendors in cross-cultural settings, which will offer important social and economic contributions to the sustainable growth of SC's business.

• 대한수학회보
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• 제36권3호
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• pp.483-493
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• 1999

We extend the Paley-Wiener-Schwartz theorem to the space of ultradistributions with respect to ultradifferentiable singular support and obtain its real version. That is, we obtain the growth condition in some tubular neighborhood of n of the Fourier transform of ultradistributions of Roumieu (or Beurling) type with ultradifferentiable singular support contained in a ball centered at the origin, and its real version.

• 가족자원경영과 정책
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• 제18권1호
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• pp.69-91
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• 2014

This study aims to examine the patterns of middle-aged parents' intergenerational support exchange with their adult children and its effects on the happiness of the parents. The sample consisted of 765 middle-aged parents selected from the National Survey of Korean Families by the Ministry of Equality and Family in 2010. The results were as follows. First, intergenerational support exchange between parents and their adult children was categorized into four groups depending on the provider of support: parents who exchanged no support with their children, parents who only received support from their children, parents who only provided support to their children, and parents who exchanged support with their children. Second, parents who exchanged no support with their children were high in instrumental support and those who both provided and received support were high in emotional support. Third, consciousness of their children significantly affected the satisfaction level of their relationship with their children. The more the parents emphasize on the growth of their children, the more they were satisfied. Parents in the support exchange group were more satisfied when they received economic support from their children. With regard to instrumental and emotional support, parents were more satisfied when they provided support to or mutually exchanged support with their children. Forth, subjective health conditions, consciousness of their children, and household's income more significantly affected the happiness of middle-aged parents than the patterns of intergenerational support exchange. With regard to economic support, parents who only received support from their children were less happy than the other groups. With regard to instrumental support, parents who exchanged no support with their children were happier than the other groups. With regard to emotional support, parents who provided support to their children were happier than the other groups.

• 한국결정성장학회지
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• 제23권6호
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• pp.265-271
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• 2013

Czochralski(CZ) 성장공정은 LED 기판용 고품질의 사파이어 단결정을 성장시키기 위한 중요한 기술 중 하나이다. 본 연구에서는 300 mm 길이의 사파이어 단결정 위한 유도 가열방식의 CZ 성장공정을 FEM으로 수치적 해석하였다. 또한 도가니의 형상 및 상부 단열재 보강 등 hot zone 구조를 변경하고, 결정의 온도 변화를 분석하였다. 본 연구의 결과, 고-액 계면의 높이는 성장 속도의 균형이 이루어져 초기에 80 mm 부터 중기 이후 40 mm 정도까지 감소하였다. 또한 CZ 성장로의 최적 입력 전력은 도가니 형상 변경 및 상부 단열재 보강에 의한 보상효과로 기존 300 mm 용 CZ 성장로 조건과 유사하다. 그리고 Hot zone 구조를 변경한 CZ 성장로를 이용해 성장시킨 결정의 온도는 기존 보다 약 10 K 정도 상승 되는 것으로 분석되었다. 본 연구에서 도출된 결과를 CZ 성장공정에 적용하여 300 mm 길이를 갖는 c-축 사파이어 단결정을 성공적으로 성장시킬 수 있었고, 단결정 성장공정에 대한 시뮬레이션 분석기법의 타당성 및 유용성을 확인하였다.

• 한국군사과학기술학회지
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• 제16권5호
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• pp.675-682
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• 2013

Reliability analysis and prediction of next failure time is critical to sustain weapon systems, concerning scheduled maintenance, spare parts replacement and maintenance interventions, etc. Since 1981, many methodology derived from various probabilistic and statistical theories has been suggested to do that activity. Nowadays, many A.I. tools have been used to support these predictions. Support Vector Regression(SVR) is a nonlinear regression technique extended from support vector machine. SVR can fit data flexibly and it has a wide variety of applications. This paper utilizes SVM and SVR with combining time series to predict the next failure time based on historical failure data. A numerical case using failure data from the military equipment is presented to demonstrate the performance of the proposed approach. Finally, the proposed approach is proved meaningful to predict next failure point and to estimate instantaneous failure rate and MTBF.