• Journal of the Korea Convergence Society
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• v.9 no.6
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• pp.251-259
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• 2018

The purpose of this study is to investigate the moderating effect of burnout on the relationship between emotional labor and turnover intention of nursery teachers. For this study, 296 teachers in nursery centers were surveyed. The data were analyzed by moderated regression analysis using SPSS V22.0 program using mean centering method. The results of the study are as follows. First, expressive emotional labor affects turnover intention and internal emotional labor did not affect turnover intention. Second, the factors that have the greatest influence on turnover intention were identified as burnout. Third, the interaction effect between burnout and deep emotional labor showed a similar moderation effect on turnover intention. Based on these results, the policy and practical measures to alleviate the burnout of the nursery teachers were suggested, and the ways of managing turnover intention by utilizing the interaction effect of the teacher burnout and deep emotional labor were suggested.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.3
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• pp.39-49
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• 2010

Ad hoc network is infrastructureless network, that the network topology is configured by each node. Each node capacity device function namely, accomplishes a network control and a function of management because not being Network device of the exclusively. Ad hoc networks what kind of node join or leave the network topology to facilitate the expansion of arbitrary topology, to the case which is the distance whose traffic is distant the place must overtake through the route of intermediate nodes, like these facts give an effect to performance fluctuation. Consequently, each node in order to maintain traffic of oneself stably there is a necessity which will consider traffic and congestion control from the node which traffic of a condition and oneself of traffic of the circumference and the route which compose the network will overtake through. This paper assumes the path of the band with a finite resource, and path traffic to occupy the competition and its impact on transmission performance of these competing arguments to configure the model factor to analyse the performance impact on the results presented. Like this result with the fact that from the study, it will contribute in network management policy and the technique.

• Korean Journal of Construction Engineering and Management
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• v.12 no.3
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• pp.11-21
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• 2011

The most critical issue in free-form buildings is how to construct the free-formed exterior facade panels. Their geometric complexity delivers many cons and problems in fabricating and constructing their shapes. To construct a free-form building, first of all, its skin has to be chopped into small pieces, which is called panelization. After panelization, the panels go through an optimization process to construct them economically. The panel's geometries are modified or regenerated through this optimization process. In this study, the panel optimization process of free-form buildings are performed through a case study. The panel shapes of the case study are modeled with Digital Project. To test the constructability of the various panels, 8 mock-up panels are made and laser scanning technology is applied to measure the preciseness of the panels manufactured in comparison with their original design.

• Proceedings of the Korea Water Resources Association Conference
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• 1998.05a
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• pp.62-67
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• 1998

낙동강 수계 다목적댐 하류 지역에 대한 홍수조절 의사결정 능력을 향상시키고자 강우- 유출 모형으로 선정된 저류함수법으로 낙동강 수계 다목적댐 하류부의 유역유출 체계를 먼저 구 성하였다. 저류함수법에 의한 낙동강 수계 유역유출 체계도는 유역의 물리적 특성을 감안하여 소 유역은 41개, 하동망은 28개로 구성하였다. 또한 수문학적 하도추적 기법이 갖는 결점을 보완하기 위하여 낙동강 본류 및 상류에 댐이 있는 금호강, 황강, 남강, 밀양강 등 1 지류 이상의 홍수추적 을 수리학적 모형으로 보완하여 유역유출 체계를 이원화하여 두시스템을 상호·연계할 수 있도록 하였다. 상기 두 시스템을 '93년 8월 홍수(8, 7~8, 15)에 시험 적용하였다. 모형수행 경과 홍수기 댐운영시 저류함수모형에 의한 강우 유출 모형과 수리학적 하도추적 모형을 통합한 시스템을 동시에 적용하여 상호 보완 과정을 통해 운영한다면 다목적댐의 홍수조절 의사결정능력을 향상시킬 수 있다고 판단된다. 본 연구에서는 사용자가 해석적 방법으로 유역에서 수문자료를 이용하여 매개변수를 대화식으로 산정할 수 있는 GUI 시스템을 EXCEL97 환경에서 개발하여 신뢰성 있는 Rating curve가 확보 상·하류에 위치한 12개 수위관측소에서 89개 홍수사상을 대상으로 유역의 매개변수를 산정하였다. 또한, 미계측 유역의 저류함수 관련 매개변수 확장을 위하여 12개 소유역 에 대한 매개변수의 평균값과 유역면적, 하도연장 및 경사, 유역의 사면경사 등의 지형인자들을 조합하여 지역화분석을 수행하여 미계측 유역의 매개변수 산정식으로 제안하였다. 본 회귀식으로 산정된 소유역별 매개변수를 '93년 8월 홍수(8, 7~8, 15)에 적용한 결과, 낙동강 수계 본류상 주요 수위관측소별 홍수량예측이 이근천공식 보다 양호한 결과를 주어 본 연구에서 제시한 유역의 매 개변수 회귀식은 미계측 유역의 매개변수 산정시 충분한 활용성을 입증하였다. 저류함수법에 의 한 낙동강 수계 다목적댐 하류부의 유역유출 체계도는 수리학적 하도추적 모형과의 연계와 유역 의 물리적 특성을 감안하여 현재의 홍수통제소에서 운영하는 홍수예경보 시스템의 유출체계도와 우리공사 물관리 상황실의 저수관리 모형의 유출체계도를 기준으로 재구성하여 다목적댐 하류부의 소유역은 41개, 하도망은 28개로 결정하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.14 no.6
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• pp.254-262
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• 2010

In order to evaluate vibration serviceability by means of non-contact vibration meter, serviceability of existing bridge were experimentally evaluated by using laser vibration meter. Test results were analyzed and compared with evaluation results acquired by using accelerometer and LVDT. To testify accuracy of laser vibration meter measured natural frequency were compared with that acquired by using accelerometer. According to test and comparison results it is showed that serviceability can be evaluated properly enough from the tolerance curve of Reiher-Meister for the estimated acceleration that can be calculated by the numerical differentiation of measured velocity. But because of cumulative numerical error occurred during integration of measured velocity in the time domain serviceability grade could be different from the result acquired by LVDT.

• Korean Journal of Construction Engineering and Management
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• v.10 no.3
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• pp.102-110
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• 2009

Although several research efforts have been directed to fast-tracking to reduce the total delivery time, few researches have been studied on concurrent engineering in construction projects. The focus of fast-tracking is primarily on overlapping independent activity pairs. In comparison, the focus of concurrent engineering is on overlapping dependent activity pairs. Dependent activities are much harder to overlap successfully. This paper presents a simulation-based Concurrent Engineering methodology to optimize the overall duration of a set of design activities in a project by modelling key factors that determine the duration of individual activities and overlap between dependent activities. This methodology involves determining how much to overlap activities, how to decide which activities to overlap and the corresponding cost and time tradeoffs using a discrete event model solution. This simulation model, therefore, can be used as a reference on decision-making to define optimum point between time and cost.

• The Korean Journal of Financial Management
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• v.26 no.3
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• pp.227-246
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• 2009

This study examines the dynamic hedging performances of the Black-Scholes model and Heston model when stock prices drift with stochastic volatilities. Using Monte Carlo simulations, stock prices consistent with Heston's(1993) stochastic volatility option pricing model are generated. In this circumstance, option traders are assumed to use the Black- Scholes model and Heston model to implement dynamic hedging strategies for the options written. The results of simulation indicate that the hedging performance of a mis-specified Black-Scholes model is almost as good as that of a fully specified Heston model. The implication of these results is that the efficacy of the dynamic hedging performances on evaluating the specifications of alternative option models can be limited.

• Korean Journal of Construction Engineering and Management
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• v.13 no.5
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• pp.125-134
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• 2012

In the construction industry, "Green" is emerging as a keyword of new growth engine. Since green construction competitiveness is essential for contractors' survival and growth, it is important to understand what constitutes green construction competitiveness. The objective of the study is to identify elements of green construction competitiveness and to discuss relationships between their importance and current level based on the Gap analysis. A better understanding of the elements of green construction competitiveness assists contractors in formulating green strategies. It also provides insight into what motivates contractors in establishing related policies and regulations. The study identifies that in general there exists a gap between the importance and current level of green construction competitiveness. It also demonstrates that CEO' competence shows a less gap between the importance and current level but firms' competence is an area of weakness. Finally a substantial gap is observed in the field of green R&D strategies and sub-contracting partners.

• The Korean Journal of Financial Management
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• v.21 no.2
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• pp.153-181
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• 2004

This study is to explore whether the relationship among financial markets changed according to financial development. For this study, data analysis was conducted through analytic methods incorporated structural breaks such as Zivot and Andrews'(1992) unit root test Gregory and Hansen's(1996a,b) cointegration test, etc. In study results, it was found that dynamic relationship between stock price and interest rate was changed from negative to positive after the structural break(Oct 1999). It may be resulted from the fact that asset substitutability between stock and bond was increased since stock investment became popularized The negative relationship between stock price and exchange rate was reinforced after the structural break(the foreign currency crisis). Also, the negative relationship between interest rate and exchange rate was strengthened after the structural break(Oct. 1999).

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.408-408
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• 2017

기후변화에 따른 극한 기후의 시 공간적 변동성과 패턴의 이상변화가 가속화되고 있으며, 이에 따른 물 순환 특성의 변화는 이수, 치수, 환경 그리고 친수 등 다양한 분야에서도 예측할 수 없는 결과를 초래하고 있다. 특히, 치수 및 이수 등 국내 수자원 관리의 대부분을 담당하고 있는 다목적댐 운영에서도 기후변화에 따른 유입량의 불확실성 증가로 안정적인 용수공급에 대한 어려움이 점차 증가하고 있는 추세이다. 유역 내의 수문학적 반응은 기상 및 지표 수문 인자의 물리적 상호메카니즘에 의해 발생하게 된다. 특히, 강우, 기온, 습도, 바람 등 기상학적 인자들은 유역 내의 수문 변동성에 직 간접적으로 영향을 주는 대표적인 인자이며, 이들 기상인자의 변동 특성을 반영하기 위한 기후지수(Climate Index, CI)는 지표수문인자인 유출과의 상관관계 분석에 유용하게 활용될 수 있다. 본 연구에서는 낙동강 유역 다목적댐을 대상으로 AR5 RCP 시나리오 기반의 기상인자에 대한 기후지수(CI)를 산정하고 다목적댐 유입량과의 상관성을 분석하였다. 대상유역의 기상 및 유입량 관측자료(1976-2005)는 기상청과 국가수자원관리종합정보시스템(WAMIS)를 이용하였으며, AR5 RCP 시나리오 기반의 유입량 자료(2005-2099)는 통계적 기법(QDM)으로 상세화된 기상자료를 입력인자로 수문모형(PRMS)을 통해 산정하였다. 또한, 기후지수(CI)와 유출지수(Standardized Streamflow Index, SSI)의 상관성 분석을 위해 Pearson 적률상관 분석방법을 적용하였으며, 통계적 유의성 검증은 Student t 검정방법을 적용하였다. 본 연구의 방법론과 결과는 기후변화에 따른 다목적댐 안정적인 용수공급을 위한 다양한 기술개발 시 기초자료로 활용될 수 있을 것으로 기대된다.