• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.5-5
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• 2019

상수관망시스템은 정수장으로부터 각 수요처에 음용수를 공급하기 위한 사회기반시설물이며, 광범위한 지역에 걸쳐 주로 지하에 시설물이 매설되어 있다. 상수관망시스템을 설계하고 운영함에 있어 노후화로 인한 유수율 저하, 갑작스런 수요량의 증가, 관로 파손 등 비정상상황에의 용수공급을 항상 대비하여야 하며, 이를 통한 지속적인 관리와 개량이 필요하다. 상수관망시스템에서 발생할 수 있는 다양한 비정상상황들 중 상수관망시스템 내 관로가 파손될 경우, 파손 관로의 보수 혹은 교체를 위해서는 해당 관로의 용수흐름을 일시적으로 차단할 필요가 있다. 이 과정에서 파손관로와 인접한 밸브를 차폐하게 되며, 이로 인해 용수공급이 중단되는 단수구역이 발생하게 된다. 단수구역은 파손 관로를 차폐함으로써 파손 관로와 함께 용수공급이 차단되는 직접고립지역과 직접고립지역으로 인해 의도치 않게 수원으로부터 물 공급이 차단되는 간접고립지역으로 구분할 수 있다. 따라서, 관 파손에 의한 단수용량을 정확히 산정하기 위해서는 시스템 내 설치된 밸브의 개수와 위치에 따른 직, 간접고립지역(단수구역)을 정확하게 산정할 필요가 있다. Jun and Loganathan(2007)은 단수구역을 직접고립지역과 간접고립지역으로 구분하여 정의하고 각각을 탐색하는 알고리즘을 제시한 바 있다. 본 연구에서는 기존 연구에서 제시한 간접고립지역 탐색 방법의 문제점을 파악하고, 이를 개선한 새로운 알고리즘을 제안 및 검증하였다. 또한, 개선된 알고리즘을 이용하여 상수관망시스템 내 최적 밸브위치를 결정하기 위해 단수용량과 밸브설치비용을 동시에 최소화하는 다목적 최적화 모형을 개발하였으며, 예시 관망을 이용하여 모의를 수행하고 결과를 분석하였다.

• Journal of the Korean Society for information Management
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• v.38 no.1
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• pp.243-262
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• 2021

The present study aims to identify the factors that affect the continuous use and discontinuance of the hospital information seeking applications(hospital apps thereafter) by employing the post acceptance model. The surveys were conducted with people who used the hospital apps from October 11 to 18, 2019. Researchers collected 125 valid data and analyzed them by using the structural equation model. The study found that the satisfaction and confirmation of expectation for the hospital apps users had significant effects on intention for continuous use and perceived usefulness, respectively. However, the perceived usefulness did not have a significant effect on the intention for continue use. The present study has identified the variables that influence the continuous use of these innovative technologies. The findings of the study confirmed the post acceptance model by observing the adoption and use of the hospital apps and extended the literature of the post acceptance model by discussing the unique characteristics of the hospital apps that satisfy the urgent help-seekers under emergency situations or the information needs emphasizing promptness. In addition, based on the benefits and limitations of hospital apps reported by consumers, the study provided practical implications for designing more user-friendly apps to hospital app developers or managers.

• Korean Journal of Construction Engineering and Management
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• v.13 no.1
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• pp.87-94
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• 2012

The apartment reconstruction projects have the proper functions such as residential environment improvement and the new housing allocation system; however, intention of the projects are distorted by the combination of factors, like failure of relocation of the original occupants and income redistribution, speculation in real estate, sharp rise in housing price, disputation between various interested parties, inadequate system and etc and it makes the projects unable to go well. Disputations and litigations are due to spread of the small conflict. As a result of the problems, it could not going smoothly and that lead to increase or stop the period and cost. This study is to estimate the period and cost using the conflict index so as to prevent and solve the problem which is among the conflict in the reverse functions. The conflict index has estimated focus on the conflict impact and the period and cost has been estimated using an variable independent including the conflict index. Also, estimated the conflict index and estimate of the period and cost are able to succeed with a minimum of disputation and money.

• Information Systems Review
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• v.20 no.4
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• pp.1-23
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• 2018

A smart phone has been widely spread around world and makes people enjoy online shopping in any time and any place. Recently it also changes the distribution environment. O2O (Online-to-Offline) service becomes new normal due to its convenience of ease shopping of product and services. O2O service market shows steady and steep growth, It is reported that, however, 80% of the businesses has been discontinued within the first year because of unstable business models, customer dissatisfaction and distrust of service. Therefore, it is very important research issue to find out influential factors promoting continuous usage intention of O2O service. Previous study shows that it only considers online characteristics and lack of analysis about offline characteristics and social impact factors. The purpose of this paper is to find out continuous usage intention factors of O2O services by literature review, case analysis, and empirical test. A comprehensive research model and related hypothesis are developed and tested by using a structural equation, Survey was carried out among users who have used O2O service including payment service for at least once. Finally 611 samples are selected out of total 813 surveys. The result shows that the model is theoretically proved and 12 out of 17 hypotheses are accepted. The contribution of this paper is that it provides a new theoretical research model about continuous usage intention factors as well as practical guidelines about promoting continuous usage and growth strategies of O2O service.

• Information Systems Review
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• v.25 no.3
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• pp.1-26
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• 2023

A theoretical model of information overload (Jackson and Farzaneh, 2012) with its three influential components (i.e., time, technology, and social networks) was empirically tested in the context of news consumption behavior considered as a communicative outcome. Using a national sample of South Korean adults (N = 1166), data analyses identified perceived information overload and large/diverse social networks positively associated with active and passive news consumption. Findings may imply the existence of individually varying cognitive threshold (i.e., tipping point), if crossed individuals cannot process information any further. News consumers may keep searching and receiving information to verify factuality of news even when they feel overloaded.