• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.712-719
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• 2013

This paper studies the security module for the reliable transmission of the meter reading and the control data between the remote terminals and the upper server-side in smart water grid. The proposed security module was implemented to make it attachable to the remote terminal without security function. In particular, unlike the smart grid of electric field, the low power is considered due to the use of battery power in the smart water grid, and the ARIA-GCM-128 symmetric key method is adopted taking into the account that the damp and constrictive environments by the installed meter location in the underground occur a communication obstacle on building of the large-scale network system. The encryption module of this paper was devised to ensure the safety between the reading data on the terminal and the control data from the upper server, and secure the stability of the remote meter reading system by taking protection against an arbitrary alteration or modification.

• Journal of the Korean Association of Geographic Information Studies
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• v.18 no.1
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• pp.13-24
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• 2015

Busan Metropolitan City lacks leisure-oriented spaces for children compared to other cities. Furthermore, it is difficult to maintain the amusement facilities for children scattered around the city due to the fact that they were worn out. To set up a leisure-oriented park for children on the site for children amusement facilities, the present study is concerned about planning children amusement facilities for public use compatible with the new trend for children amusement facilities. For this purpose, a number of case studies, carried out domestic and abroad on developing children amusement facilities, were examined to choose appropriate facilities and feasible project plans were drawn up. Major findings of the study are as follows. First, it is strongly suggested that this project should be promoted because it is a leading pilot project for building children theme parks for each zone in Busan Metropolitan City. Second, it is suggested that field study programs should be run in connection with Busan Metropolitan City Office of Education.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.5
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• pp.529-536
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• 2019

Recently, various efforts have been tried in the construction industry to improve productivity by applying the fourth industrial revolution technology. Among the various technologies, researches for the automation and digitization of earthworks are being carried out steadily. As the interest in the benefits of digitalization of the earthwork field has increased, there have been more cases of technology development and application for digitalization of the earthwork field. However, there is not enough case study to present the analysis results of application cases. The purpose of this study is to verify the feasibility of applying the digitization technology of the earthwork in actual worksite. In order to digitize the worksite terrain, it is required the process of field measurement, measurement data registration, earthwork information input, and analysis cell generation. Particularly, it is possible to achieve information-enabled digitization rather than digitalizing only the shape through the input of the earthwork information and the analysis cell generation. By using the digital information of the earthwork field, it is possible to visually recognize the change of the earthwork field, so that it is expected to enhance the worker 's understanding and to be highly applicable to the management work. It is expected that the digital technology of earthwork site will be able to know the precise amount of volume change of the earthwork numerically, and it will be highly applicable to construction management.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.32 no.5
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• pp.305-311
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• 2019

In this study, we examined the proper spacing between the expansion joints according to the temperature load of the inter-modal terminal platform infrastructure to implement a new inter-modal automated freight transport system, which we intend to introduce in Korea. To review the proper expansion joint spacing of the terminal platforms, we set the maximum expansion joint spacing according to the regional temperature changes using the equation proposed by the Federal Construction Council (FCC) of the United States. Then, the maximum displacement value, which was calculated through the structural analysis program, and the limit of the horizontal displacement of the building structure were compared. The proper expansion joint spacing was selected as the slab length at which the maximum displacement of the structure, due to temperature changes, was below the horizontal displacement limit. Based on the application of maximum expansion joint spacing for each region calculated through the FCC's suggestion, the maximum displacement that could occur within the limit of the lateral displacement of the structure was determined.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.39 no.5
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• pp.647-656
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• 2019

This paper aims to analyze the priority of elements in building management system surveying owners living in Small-scale Apartment, and to suggest basic data for establishing effective management alternatives. To achieve the goal, this paper extracted the elements from a guideline supported by the Ministry of Land, Infrastructure and Transport in Korea, and tried to analyze their priority. The result as follows. First, the analysis of the first level suggested that people give priority to facility management, moving management, security management and administrative for management. Second, on the analysis of the second level, settlement of budget was the most important for the administrative, cleaning for facility management, parking management for security management and advertisement of the administrative for moving management. By suggesting the result, this paper concludes that it would be very important to establish a regional management corporation to manage the Small-scale Apartment.

• Journal of Korea Port Economic Association
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• v.23 no.2
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• pp.63-86
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• 2007

Historically, government has facilitated logistics by building the airports, the seaports, the rail and transit lines, subsidized their operations where necessary, and established the basic laws and regulations pursuant to which the industry serves the public. In the late 1990s and early 2000s, Korean government began to prepare the basic laws of logistics and nowadays it has tried to refine national logistics laws to reflect contemporary industry conditions and evolving ideological attitudes. The policy objectives governing logistics regulation have changed significantly since 2000. This article traces the current status of the Korean logistics laws which regulate one of the nation's most important industries and suggests certain amendment of current laws.

• Journal of Korean Association for Spatial Structures
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• v.18 no.4
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• pp.113-121
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• 2018

U-flanged truss beam is composed of u-shaped upper steel flange, lower steel plate of 8mm or more thickness, and connecting lattice bars. Upper flange and lower plate are connected by the diagonal lattice bars welded on the upper and lower sides. In this study the structural experiments on the U-flanged truss beams with various shapes of upper flange were performed, and the flexural and shear capacities of U-flanged truss beam in the construction stage were evaluated. The principal test parameters were the shape of upper flange and the alignment space of diagonal lattice bars. In all the test specimens, the peak loads were determined by the buckling of lattice bar regardless of the upper flange shape. The test results have shown that the buckling of lattice bar is very important design factor and there is no need to reinforce the basic u-shaped upper flange. However, the early lattice buckling occurred in the truss beam with upper steel bars because of the insufficient strength and stiffness of upper chord, and the reinforcement in the upper chord is necessary. The formulae of Eurocode 3 (2005) have presented more exact evaluations of lattice buckling load than those of KBC 2016.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.6
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• pp.99-105
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• 2018

This paper proposes multiple access method for smart doorlock system using VLC(Visible Light Communication) with color grid modulation method. The proposed method is to connect multiple visible light signals using color grid modulation method in order to recognize and authenticate multiple users accessing doorlock. In order to enable visible light multiple access with existing infrastructure, the symbol energy interval of signal should be maximized. Thus, performance of system in VLC channel is measured by modulating symbols based on the proposed method. We confirm the actual channel test results of the modulated signal to implement doorlock system that recognizes the number of multiple access users.

• Fire Science and Engineering
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• v.33 no.2
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• pp.56-62
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• 2019

A sprinkler is a fire extinguishing equipment installed in a protected area where a detector or head detects a fire and automatically puts out the fire. However, the Ministry of Land, Infrastructure and Transport's "Regulations on Building Evacuation and Fire Protection Standards, etc." stipulate that fire compartment area should be reduced to three times by installing sprinkler facilities in the case of factories and warehouses. In this study, fire hazard was analyzed for a real PCB factory which mitigated the fire protection zone by sprinkler installation, and the head opening characteristics of sprinkler facilities through computer simulation, installation standards of sprinkler facilities, thermal performance, operating range, and the amount of water sprayed to identify the problems of operation of sprinkler facilities in case of fire, and to suggest the grounds such as required sprinkling flow rate for system improvement.

• Journal of Korea Port Economic Association
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• v.35 no.1
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• pp.19-38
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• 2019

The Seosan-Daesan Port is closest to the major ports of China; hence, it is recognized as the ideal port for trade with China. Well-developed industrial infrastructure in its hinterland, including petrochemical, automotive, and electronic component complexes and recent developments of port facilities that aim to strengthen its function as a commercial port clearly highlight the necessity to develop it as a comprehensive port by building a marine industrial cluster. In this study, prerequisites for marine industrial cluster development in Seosan-Daesan Port are identified; they include the following. First, the conditions to be met for being designated a marine industrial cluster should be amended; Second, the central government should delegate authority to local governments to ensure the development of marine industries; Third, changes related to marine industrial cluster development in the governance structure of local governments (Seosan City and Chungnam Province) are required; and Last, a consultative body should be established to facilitate discussions on developing a marine industrial cluster in Seosan-Daesan Port and build public consensus.