• Title/Summary/Keyword: Moderator

Search Result 572, Processing Time 0.028 seconds

Impact of Fourth Industrial Revolution on Airport Management System: Moderator Effect of Convergence and Leadership (4차 산업혁명이 공항경영시스템에 미치는 영향 : 융합 및 리더십의 조절효과)

  • Lee, Yung-Kil;Baek, Jeong-Sun;Park, Sung-Sik
    • Journal of Advanced Navigation Technology
    • /
    • v.26 no.5
    • /
    • pp.289-303
    • /
    • 2022

  • The purpose of this study verify to influence the effect of the 4th industrial revolution recognized by airport operators on the airport management system and the moderator effects of convergence and leadership between these influence relationships. Data collected through a survey of airport operators using simple random sampling at six international airports in Korea. Data analysis performed using Structural Equation Modeling. The research results found that the 4th industrial revolution had a positive effect on the airport management system. Also, moderator effects of convergence and leadership found significant statistically. In this paper, we asserts that it should be reconstructed the airport management system as a system suitable for the era of the 4th industrial revolution. This paper provide theoretical data and directions for empirical research to airport researchers, and implications for airport enterprise managers and airport policy planners. The findings of this study are particularly helpful for international airports that have adopted the technologies of the Fourth Industrial Revolution.

  • https://doi.org/10.12673/jant.2022.26.5.289 인용 PDF KSCI HTML

Preliminary Thermal-Hydraulic Analysis of the CANDU Reactor Moderator Tank using the CUPID Code (CUPID 코드를 이용한 CANDU 원자로 칼란드리아 탱크 내부유동 열수력 예비 해석)

  • Choi, Su Ryong;Lee, Jae Ryong;Kim, Hyoung Tae;Yoon, Han Young;Jeong, Jae Jun
    • Journal of Energy Engineering
    • /
    • v.23 no.4
    • /
    • pp.95-105
    • /
    • 2014

  • The CUPID code has been developed for a transient, three-dimensional, two-phase flow analysis at a component scale. It has been validated against a wide range of two-phase flow experiments. Especially, to assess its applicability to single- and two-phase flow analyses in the Calandria vessel of a CANDU nuclear reactor, it was validated using the experimental data of the 1/4-scaled facility of a Calandria vessel at the STERN laboratory. In this study, a preliminary thermal-hydraulic analysis of the CANDU reactor moderator tank using the CUPID code is carried out, which is based on the results of the previous studies. The complicated internal structure of the Calandria vessel and the inlet nozzle was modeled in a simplified manner by using a porous media approach. One of the most important factors in the analysis was found to be the modeling of the tank inlet nozzle. A calculation with a simple inlet nozzle modeling resulted in thermal stratification by buoyance, leading to a boiling from the top of the Calandria tank. This is not realistic at all and may occur due to the lack of inlet flow momentum. To improve this, a new nozzle modeling was used, which can preserve both mass flow and momentum flow at the inlet nozzle. This resulted in a realistic temperature distribution in the tank. In conclusion, it was shown that the CUPID code is applicable to thermal-hydraulic analysis of the CANDU reactor moderator tank using the cost-effective porous media approach and that the inlet nozzle modeling is very important for the flow analysis in the tank.

  • https://doi.org/10.5855/ENERGY.2014.23.4.095 인용 PDF KSCI