• Journal of the Korean Operations Research and Management Science Society
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• v.24 no.3
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• pp.93-107
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• 1999

We consider the development of an integer programming model and algorithm for the ATM switching node location problem. There are two kinds of facilities, hub facilities and remote facilities, with different capacities and installation costs. Each customer needs to be connected to one or more hub facilities via remote facilities, where the hub(remote) facilities need to be installed at the same candidate installation site of hub(remote) facility. We are given a set of customers with each demand requirements, a set of candidate installation sites of facilities, and connection costs between facilities, We need to determine the locations to place facilities, the number of facilities for each selected location, the set of customers who are connected to each installed hub facilities via installed remote facilities with minimum costs, while satisfying demand requirements of each customer. We formulate this problem as a general integer programming problem and solve it to optimality. In this paper, we develop a branch-and-cut algorithm with path variables. In the algorithm, we consider the integer knapsack polytope and derive valid inequalities. Computational experiments show that the algorithm works well in the real world situation. The results of this research can be used to develop optimization algorithms to solve capacitated facility location problems.

• Journal of Korean Society on Water Environment
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• v.34 no.2
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• pp.226-233
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• 2018

Small-scale wastewater discharge facilities account for 98% of all workplaces, but in the generation and emission of major pollutants, they account for 27.5 % and 23.5 %, respectively. Since the proportion of the emission load of the small-scale workplace is not large, the national environmental policy has been established mainly around large-scale wastewater discharge facilities. However, in the case of specific hazardous substances in water, the amount of the discharge load of the small-scale wastewater discharge facility was 2.4 times higher than that of the generation load. Certain types of specific hazardous substances in water, which have a higher discharge load than large-scale wastewater discharge facilities, account for 24 ~ 32 %. There are also cases in which the discharge load from a small-scale discharge facility is more than four times higher, depending on the specific kind of water pollutant. As a result of inspections, the violation rate of the small-scale wastewater discharge facility among the total violations by facilities is 93.9 ~ 97.5 %. As a result, the ecotoxicity value of small-scale wastewater discharge facilities was high in most industries, and there was a fluctuation in the measured value. This indicates that the ecological integrity of the water system can be largely influenced by small-scale wastewater discharge facilities. Therefore, it is necessary to expand the environmental management of small-scale wastewater discharge facilities, and in some cases, the effect of the improvement in quality may be more significant than in the management of large-scale wastewater discharge facilities.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.269-270
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• 2023

As facilities in apartment unit by age, residents feel uncomfortable in their lives, but maintenance and management are not carried out properly. For the systematic maintenance of facilities, the derivation of facilities that require maintenance shall be preceded. This study aims to derive items that require intensive management among exclusive facilities. The purpose of this study is to analyze the history of repairing facilities through complaints about the exclusive use of public rental housing to identify the cause and to derive items that require intensive management of the exclusive use of apartment houses.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.411-413
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• 2010

The purpose of this research is to study use method of mobile system for effective field management for urban facilities. GIS database could be standardized commonly useful for the site management of city facilities through standard list, standard items and standard specification appropriate for the mobile system, and this is effective to manage the city facilities on the site in real time.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.315-316
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• 2010

This study refer to make a selection of a location using multi-dimension spatial information for University's facilities management. Structures and new construction plane of the building for the simulation through the use of space to maximize the optimal location decisions. As a result, making a rational decision of facilities plan and management can be maximized.

• Journal of Industrial Convergence
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• v.12 no.1
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• pp.38-58
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• 2014

The purpose of this study is to seek ways for more efficient and successful Management strategy by examining the environmental changes and risk factors of child care centers, and preparing the measures for improvement, aiming at more effective operation of childcare facilities. This study analyzed through literature and case studies how the environment has changed in child care centers and which safety accidents and cases occur in those facilities, and searched the ways for Managemeut strategy to effectively operate those facilities.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2000.04a
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• pp.458-467
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• 2000

The standard of performance-based seismic design accepted by Ministry of Construction and Transport requires to install and manage earthquake instruments for the facilities of seismic category I and to acquire earthquake response data of these facilities at earthquake events. So detailed standard and guideline for installation and management of earthquake instruments for each facilities according to the seismic design standard are getting ready. This paper presents the part of installation locations of sensors in that detaile standard and guideline.

• Proceedings of the Safety Management and Science Conference
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• 2003.05a
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• pp.1-5
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• 2003

We purpose a decision model to select the optimal facilities for the Decision Making problems with multiple characteristics(nominal-is-best characteristics, larger-is -better characteristics, smaller- is -better characteristics). Using this model, concept of the loss function is used in this comprehensive method of for select the optimal preferred facilities. To solve the issue on the optimal preferred facilities for multiple characteristics, this study propose the loss function with cross-product terms among the characteristics and derived range of the coefficients of the terms.

• Journal of the Korean Institute of Educational Facilities
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• v.15 no.4
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• pp.89-90
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• 2008

• Spatial Information Research
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• v.16 no.4
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• pp.421-439
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• 2008

The objective of this project is to construct the intelligent underground facility management system based on UFSN (Underground Facility Sensor Network). Total project duration is 6-year. And first two years' project has been finished. First two years' project focused on water supply and sewage facilities among 7 underground facilities and investigated the fundamental construction technology for the underground facilities management system. To contribute the development of systematic and scientific management of underground facilities, KRIHS implemented 3 researches for 'Underground facilities management system for an intelligent city' like followings: (1) to investigate an integration plan for current water supply and sewage management systems, (2) to derivate of water supply and sewage monitoring items for the monitoring technology development, and (3) to implement a basic research for sensor installation plans on different types of current and new underground facility systems. This research paper contains the first two years' outcome of researches from KRIHS (Korea Research Institute for Human Settlements).