• 전기학회논문지
• /
• 제65권5호
• /
• pp.836-842
• /
• 2016

When an accident occurs in the nuclear power plant, the faulted information might mislead to the high possibility of aggravating the accident. At the Fukushima accident, the operators misunderstood that there was no core exposure despite in the processing of core damage, because the instrument information of the reactor water level was provided to the operators optimistically other than the actual situation. Thus, this misunderstanding actually caused to much confusions on the rapid countermeasure on the accident, and then resulted in multiplying the accident propagation. It is necessary to be equipped with the function that informs operators the status of instrument integrity in real time. If plant operators verify that the instruments are working properly during accident conditions, they are able to make a decision more safely. In this study, we have performed various tests for the fault detection sensitivity of an data-driven empirical model to review the usability of the model in the accident conditions. The test was performed by using simulation data from the compact nuclear simulator that is numerically simulated to PWR type nuclear power plant. As a result of the test, the proposed model has shown good performance for detecting the specified instrument faults during normal plant conditions. Although the instrument fault detection sensitivity during plant accident conditions is lower than that during normal condition, the data-drive empirical model can be detected an instrument fault during early stage of plant accidents.

• 산경연구논집
• /
• 제11권4호
• /
• pp.19-30
• /
• 2020

Purpose: The purpose of this study examines the mediating effect of clan leadership in the relationship between hierarchy culture and organizational commitment. Most previous research focused on the relationship between organizational culture and organizational performance or organizational culture and job satisfaction. There are few empirical studies that focus on organizational commitment data because it is difficult to collect in many cases of export-driven small and medium sized enterprises. However, this research measures affective commitment, continuance commitment, and normative commitment differently than previous research, which is mostly focused on the hierarchy culture, clan leadership, and organizational commitment measurements. Research design, data, methodology: Conceptual research model is based on the studies of Cameron and Quinn (2011), and Gungor and Sahin (2018). The model is designed with three constructs such as hierarchy culture, organizational commitment, and clan leadership. The monitor culture and coordinator culture are as proxy for the hierarchy culture. The affective commitment, continuance commitment, and normative commitment are as proxy for the organizational commitment. And also the facilitator leadership and mentor leadership are as proxy for the clan leadership. Based on three hundred cases such as export-driven small and medium sized enterprises (SMEs), this study verify the hypothesis. Hypothesis was analyzed with the structural equation modeling. Results: In case of export-driven small and medium sized enterprises (SMEs), clan leadership acts as a mediator in the relationship between hierarchy culture and organizational commitment. In case of export-driven small and medium sized enterprises (SMEs) with high organizational commitment, clan leadership acts as a mediator in the relationship between hierarchy culture and organizational commitment. In case of export-driven small and medium sized enterprises (SMEs) with low organizational commitment, clan leadership did not act as a mediator in the relationship between hierarchy culture and organizational commitment. Conclusions: By controlling for the mediating effect of clan culture, this study have improved the academic contributions as well as policy and practical implications through empirical study of clan leadership that affect organizational commitment in the fields of hierarchy culture. In addition, this study means that the mediating effects on the variables of clan leadership were examined.

• 산업경영시스템학회지
• /
• 제41권3호
• /
• pp.90-96
• /
• 2018

This paper proposed data driven techniques to forecast the time point of water management of the water reservoir without measuring manganese concentration with the empirical data as Juam Dam of years of 2015 and 2016. When the manganese concentration near the surface of water goes over the criteria of 0.3mg/l, the water management should be taken. But, it is economically inefficient to measure manganese concentration frequently and regularly. The water turnover by the difference of water temperature make manganese on the floor of water reservoir rise up to surface and increase the manganese concentration near the surface. Manganese concentration and water temperature from the surface to depth of 20m by 5m have been time plotted and exploratory analyzed to show that the water turnover could be used instead of measuring manganese concentration to know the time point of water management. Two models for forecasting the time point of water turnover were proposed and compared as follow: The regression model of CR20, the consistency ratio of water temperature, between the surface and the depth of 20m on the lagged variables of CR20 and the first lag variable of max temperature. And, the Box-Jenkins model of CR20 as ARIMA (2, 1, 2).

• KEPCO Journal on Electric Power and Energy
• /
• 제4권2호
• /
• pp.101-105
• /
• 2018

본 논문에서는 가스 터빈 축 진동 신호 비정상 상태 분석의 사례 연구를 위해 커널 회귀 모델을 적용한다. 원격으로 전송되는 발전소 가스터빈의 진동데이터에 커널 회귀 모델을 적용하여 설비를 실시간으로 감시 및 분석 외에도, 축진동 신호의 비정상 상태를 분석하기 위하여 활용될 수 있다. 정상운전 중에 측정한 가스터빈의 정상적인 축진동 데이터 기반의 훈련데이터를 사용하여 생성한 자동연관커널회귀의 경험적 모델을 생성하고 적용할 수 있다. 이 데이터 기반 모델의 예측치를 실시간 데이터와 비교하여 신호의 상태를 분석하고 잔차를 감시하여 이상상태에 대한 분석 정보를 제공할 수 있다. 이상상태에서 발생하는 잔차는 비정상적으로 변화됨으로서 비정상 상태를 분석 할 수 있다. 본 논문에서 커널회귀모델은 축진동 센서의 신호 이상의 원인 분석 사례에서 고장을 구분할 수 있는 정보를 제공한다.

• International Journal of Air-Conditioning and Refrigeration
• /
• 제9권1호
• /
• pp.11-19
• /
• 2001

To establish optimum cycle of the inverter-driven heat pump with a variation of frequency, the bypass orifice, which was a short tube haying a bypass hole in the middle, was designed and tested. Flow characteristics of the bypass orifice were measured as a function of orifice geometry and operating conditions. Flow trends with respect to frequency were compared with those of short tube orifices and capillary tubes. Generally, the bypass orifice showed the best flow trends among them. and it would enhance the seasonal energy efficiency ratio of an inverter heat pump system, Based on experimental data, a semi-empirical flow model was developed to predict mass flow rate through bypass orifices. The maximum difference between measured data and model`s prediction was within $\pm$5%.

• 설비공학논문집
• /
• 제11권1호
• /
• pp.109-116
• /
• 1999

To establish optimum cycle of the inverter-driven heat pump with a variation of frequency, the bypass orifice, which is a short tube having a bypass hole in the middle, was designed and tested. Flow characteristics of the bypass orifice were measured as a function of orifice geometry and operating conditions. Flow trends with respect to frequency were compared with those of short tube orifices and capillary tubes. Generally, the bypass orifice showed the best flow trends among them, that will enhance the seasonal energy efficiency ratio of an inverter heat pump system. Based on experimental data, the semi-empirical flow model was developed to predict mass flow rate through bypass orifices. The maximum difference between measured data and model's prediction was within ${\pm}5%$.

• 디지털융복합연구
• /
• 제20권3호
• /
• pp.181-189
• /
• 2022

모바일 기기의 확산과 ICT 기술로 핀테크 혁신이 더욱 가속화 될 것으로 전망되는 가운데, 최근 금융의 화두는 '디지털 전환'이며, 여기에는 빅데이터의 활용이 주요 요소라 할 수 있다. 특히 오픈 뱅킹이라는 인프라가 마이데이터와 마이페이먼트 산업과 연계되어 금융정보의 이종결합, 자산 조회 및 이체 기능이 결합되는 오픈 파이낸스 시대가 도래고 있다. 마이데이터는 데이터 활용을 통한 가치 창출에 주목하여 나타난 개념으로, 데이터의 주체가 능동적인 자기결정권을 갖는데 의의가 있는데 현재 국내에서도 마이데이터가 시행 되며 전략적 활용방안을 모색되고 있다. 이에 본 연구는 마이데이터 관련 비즈니스 사례를 분석하여 향후 금융의 디지털 전환을 위한 전략적 활용방안을 제시하는 것을 목적으로 하였다. 해외 주요국가에서 마이데이터 개념을 적용한 PSD2 및 오픈뱅킹 정책을 적극 추진하고 있는 가운데 성공적인 비즈니스 모델(Mint, Information Bank, Strands)의 분석을 통해 데이터 기반 비즈니스의 타당성을 확인하고 공통점을 모색하기 위한 사례 연구를 수행하였다. 거래의 효율성과 다양성을 향상시키는 사업 모델을 제공한다는 관점에서 마이데이터는 기존의 사업 모델을 개선할 수 있는 잠재력이 있음을 확인할 수 있었다. 마이데이터는 본인 중심의 모든 데이터로부터 개별적인 데이터 생태계를 쉽게 구현하고 관리할 수 있어야 하는데 개인이 스스로 이를 관리, 통제, 활용하는 것은 현실적으로 어렵다. 따라서 마이데이터 오퍼레이터 또는 마이데이터 서비스 제공자 역할을 할 수 있는 비즈니스 모델이 적극적으로 모색될 필요가 있겠다.

• 물과 미래
• /
• 제26권3호
• /
• pp.47-61
• /
• 1993

수정 tank 모형의 입력, 구동, 출력 및 매개변수의 보정을 실시할 수 있는 쉘 프로그램 DSFS를 개발하고, 중소 유역의 일 유출량의 추정에 적용하도록 하였다. 수정 tank 모형은 유역의 일별 증발산 손실을 추정함으로써 유출량을 정의하도록 하였으며, 증발손실량은 배재 증발산량에 토양수분계수 및 토지 이용상태에 따른 월별 작물피복계수를 써서 조정하도록 하였다. 모형의 매개변수를 보정하고, 매개변수와 유역 특성인자와의 관계를 얻었다. 개발된 쉘 프로그램을 미계측유역에 적용하였으며, 일유출량 추정에서 최적화 결과와 유사한 값은 보였으나, 년 유출량은 10% 정도 큰 값은 보였다.

• Journal of Information Technology Applications and Management
• /
• 제12권4호
• /
• pp.105-121
• /
• 2005

Ubiquitous computing(UC) is an emerging paradigm. Its arrival as a mainstream is expected to trigger innovative UC-driven business models (UCBMs). Currently, there is no Parsimonious methodology to analyze and provide diagnostics for UCBMs. With this research, we propose a analytical architecture that enables the assessment of an UCBM in its structural strengths and weaknesses. With value logic as the cornerstone, the architecture is composed of value actors, value assets, value context, business value Propositions, customer value propositions, value creation logics, and value assumptions. Dimensional variables are initially Identified based on the review of business model literature. Then, their significance is empirically examined through 14 UCBM scenarios, and variables that are expected to Play an important role in the UCBM assessment are decided. Finally, by analyzing the scenarios in terms of the dimensional variables, we attempted to summarize general characteristics of emerging UCBMs.

• 품질경영학회지
• /
• 제47권4호
• /
• pp.861-873
• /
• 2019

Purpose: The purpose of this study is to investigate the effects of organizational culture, personality Traits, work addiction and workplace family conflict on the life satisfaction of Korean Air crew. Methods: The collected data through the survey were analyzed using structure equation model analysis The sample used for the empirical analysis is a total of 578 questionnaires. Results: Empirical analysis summarized next. Organizational culture and personality characteristics have some effects on work poisoning. However, the compulsion of work driven does not affect work-family conflict, Family-Work Conflict does not affect Life Satisfaction. Conclusion: This paper has a contribution in that it extends the range of the academic research concerning Workaholic. Also this paper provides implications on effective human resource management method suitable for airline industry.