• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.836-839
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• 2007

At the present, all resources on ubiquitous are smart and networking. it deduces the environment that any service could be provided without any restriction of time and space and maximizes life quality and creation of people and industry productivity. especially, it converses and integrates all fields in the city based on Ubiquitous computing, IT. Furthermore, the study on the technology concerned with Ubiquitous is actively conducted. In this paper, we would like to look onto the types of necessary system and technology when the Ubiquitous system is applied to buildings. Besides, as analyzing necessity and expecting effect of ubiquitous system, we suggest the method to establish ubiquitous system in multi-complex buildings.

• 한국IT서비스학회:학술대회논문집
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• 2008.11a
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• pp.559-562
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• 2008

IT와 건설 산업간 융합의 대표적 사례로서 유비쿼터스 도시의 개념이 도입된 이후 현재 여러 지자체에서 u-City 구축이 확산되고 있다. 한편, u-City에 구축된 첨단 인프라의 활용성을 극대화하여야 한다는 부담감이 다양한 u-서비스에 대한 고민으로 이어 졌으며, 이로부터 u-디바이스간 협업의 개념이 파생되었다. u-디바이스간협업의 예로는 공공장소에서의 개인 미디어 재생과 같은 응용이 자주 거론되고 있다. 그러나 음향 미디어의 재생에 있어서는 그 재생의 품질이 서비스의 만족도에 중요한 역할을 할 것이다. 이에 본고에서는 하이파이 재생 시스템의 모델로부터 고충실도 음향 재생을 위한 기능요소를 추출하고, 이를 기반으로 하이파이 응용을 위한 u-서비스 제공 구조를 제시하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.5
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• pp.113-120
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• 2020

Safety accidents, called industrial accidents in construction work, are causing a lot of casualties, property damage and social controversy in the event of an accident, causing the construction to lose public confidence. The risk of safety accidents at construction sites may continue to increase as the construction of high-rise, large-scale, and multi-purpose complex buildings has increased in recent years. In particular, the most frequently constructed apartment construction among reinforced concrete buildings is designed and constructed with a wall-like structure with no beams for each floor, while the lower floors are made of lamen with columns and beams. As a result, the transfer beam or transfer slab to withstand the upper load is installed on the upper part of the Ramen structure, so the system Dongbari, which is installed as a temporary material during concrete laying construction, may collapse at any time during plowing and curing. The purpose of this study is to apply IT convergence technology to prevent the collapse of the system Dongbari during concrete installation, and to apply many of the variables that may occur during construction on a case-by-case basis to check the stability of the system Dongbari and to propose a model of the anti-conducting prediction system.

• Journal of the Korean Society of Industry Convergence
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• v.25 no.5
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• pp.773-782
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• 2022

Estimation of cable tension through proper measurements is one of the essential tasks in evaluating the safety of cable structures. In this paper, a study on cable tension estimation using the built-in accelerometer and camera in a smartphone was conducted. For the experimental study, visual displacement measurement using a smartphone camera and acceleration measurement using a built-in accelerometer were performed in the cable-stayed bridge model. The estimated natural frequencies and transformed tensions from these measurements were compared with the theoretical values and results from the normal visual displacement method. Through comparison, it can be seen that the error between the method using the smartphone and the normal visual displacement is sufficiently small to be acceptable. It has also been shown that those errors are much smaller than the difference between the values calculated by the theoretical model. These results show that the deviation according to the type of measurement method is not large and it is rather important to use an appropriate mathematical model. In conclusion, in the case of cable tension estimation, it can be said that the visual displacement measurement and acceleration using a smartphone can be a sufficiently applicable method, just like the normal visual displacement method. It is also noteworthy that the smartphone accelerometer has a larger magnitude error and has more limitations such as high-frequency sampling instability compared to the visual displacement method, but shows almost the same performance as the visual displacement method in this cable tension estimation.

• Convergence Security Journal
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• v.13 no.2
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• pp.15-24
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• 2013

In the 1960s, economic growth served to step up industrialization and urbanization, which was concurrent with th e urban concentration of population, and this phenomenon led to an increase in crime, and there was a rapid increase in demand for security at the same time. So the law enforcement authorities instituted the security service act in a move to secure quasi-police force. The enactment of the security service act has been put in force up to now, fueling the growth of security business. Mean while, the security industry has attained a splendid growth as one of growth industries, and it's required to look back on the past to determine new directions for the industry to make a new leap forward. Thus, the 1970s was a period to lay the groundwork for Korean private security, and the purpose of this study was to examine the social environments of the 1970s related to private security and what accelerated the development of private security.

• Journal of Korea Society of Digital Industry and Information Management
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• v.15 no.3
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• pp.207-223
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• 2019

This study aims to explore the casual relation between construction company employees' Self-Leadership and two variables: Organization Citizenship Behaviour and Organizational Trust through Psychology Empowerment. To explain in details, this study examines how the independent variable, Self Leadership, with its behavior-focused, natural reward and constructive thought pattern strategies, affects the dependent variable, Organization Citizenship Behavior and Organizational Trust through the intervening variable, Psychology Empowerment. A survey was conducted on current employees of construction companies in metropolitan areas to empirically examine the research model. The result of study hypothesis on Self-Leadership is as follows; first, Self-Leadership showed a positive effect on Psychology Empowerment, Organization Citizenship Behaviour and Organizational Trust. Second, Psychology Empowerment showed a positive effect on Organization Citizenship Behaviour. Third, Psychology Empowerment showed a positive effect on Organizational Trust. The capacity of individuals is critical when it comes to competitiveness of construction companies. When employees willingly participate in building trust within the company, the work place will become more and more constructive; based on trust, efficiency will increase because people from different processes can work together and performance will also improve even when project managers are absent because others could help their role instead, thus driving more efficient human resource management to the company. To conclude, a company's vision can be spread wide and far when their employees engage themselves in Learning Organization with Self Leadership. They will also be satisfied with their work through improving interpersonal relationship at work.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.35 no.12
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• pp.127-136
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• 2019

National Housing in Janghang was built intensively from the mid 1970s to the early 1980s, and has become a collective complex at Jangma-ro and Shinchangdong-ro. This Company House is a typical building for employee welfare, at the same time shows modern industrialization and urbanization. In general, it forms a housing complex and serves as industrial town. Reflecting the characteristics of Janghang, the housing complex is called National House based on the supply method and is also classified French Styled House in terms of housing style. Although Janghang was one of small local administrative units, it pursued urban style with mini-2-story. It has the typical characteristics as follows: division of the owner's living space and rental room, and independent layout of restrooms and washrooms. House is transformed to accommodate residents' lifestyles, so National Housing Complex of Janghang has undergone various changes such as the replacement of spatial structures and exterior materials for 40 years after construction. National Housing in Janghang is a symbol of local identity and an important spatial asset that shows the urban and architectural characteristics and changes.

• Journal of the Korean Society of Industry Convergence
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• v.21 no.6
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• pp.273-284
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• 2018

3D printing technology in the construction field is currently being developed and commercialized actively in foreign countries, but the development of material and equipment is underway as an initial research stage in Korea. It is necessary to implement commercialization through the introduction of 3D printing technology in the construction field as soon as possible in Korea, but there is no guideline for suitable equipment and materials in Korea at present. Therefore, in order to help prepare for commercialization, it is necessary to provide data such as equipment size and materials suitable for commercialization at the initial stage. This study investigates the types, specifications, and applications of equipment that are being used overseas to provide the equipment type and material cost required in the initial stage of commercialization in Korea. Using the surveyed data, it was possible to calculate the advantages and disadvantages of the equipment type and specification, and the cost of materials used. As a result of the analysis, Gantry type is suitable for the domestic commercialization, and the standard of the output area is $100m^2$ and the extrusion amount of $250m^3/sec$ is proposed, and the material cost of the commercial product is 20thousand won. The suggestions in this study will help to plan the construction of products and equipments to commercialize 3D printing technology in construction field in the future.

• Journal of the Korean Society of Industry Convergence
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• v.27 no.4_2
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• pp.833-840
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• 2024

According to recent data from the Korea Meteorological Administration(KMA), the frequency of typhoons around the Korea Peninsula is almost unchanged, but the intensity is on the rise due to climate change. A typhoon that has become so powerful can cause partial or complete damage to the traffic signal structures, limiting the operation of the vehicle and causing traffic congestion. If the traffic signal structure fails to function properly due to the influence of the typhoon, not only the v ehicle operation will be disrupted, but also direct damage to the traffic signal structure will occur. In addition, if the social overhead cost of traffic congestion is included, the recovery cost caused by the typhoon will increase to an extent that it is difficult to estimate. Therefore, in this study, a wind tunnel experiment was performed by producing a wind tunnel model of an existing fixed traffic signal structure and a traffic signal structure in which signs and traffic lights are hinged. Also, The fixed and hinge structures were modeled as 3D finite elements, and wind-resistant analysis was performed by wind speed, and, wind-resistant safety of traffic signal structures were analyzed and examined through wind-resistant analyses. From the comparative analysis of the results of experiment and FE analysis, it was known that the stress reduction rate of the hinge connection structure was at least 30% compared to that of the fixed connection structure from the results of the wind tunnel experiment and FE analysis. And As a result of finite element analysis for the maximum design wind speed of 50m/s, it was found that the maximum stress generated in the existing structure exceeded all the yield stress, but the maximum stress of the hinge connection structure was within the yield stress. Finally The hinge connection structure showed a relatively large stress reduction rate as the wind speed increased and the length of the lateral beam was shorter at the same wind speed.

• Journal of the Korean Society of Industry Convergence
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• v.27 no.5
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• pp.1069-1080
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• 2024

Recently, vision-based displacement(VBD) has been attracting attention as a convenient and economical method. VBD has the advantage of being easy to install and operate, but it also has the disadvantage of being difficult to obtain results that reflect high-frequency characteristics well. On the other hand, indirect displacement measurement through double integration of acceleration may in some cases result in distortion in the low-frequency region, making integration itself impossible. Therefore, neither can be a suitable method alone for measuring the dynamic displacement of bridges under moving loads. In this context, this paper studies how to obtain more accurate dynamic displacement responses of bridges over the entire frequency range by combining two methods, VBD and acceleration integration. The practical applicability was examined through simulation and model experiments. The simulation results show that both basic methods have fundamental limitations in each frequency range, while the combined method can be an good alternative to overcome these limitations. The applicability of the combination method through model experiments also showed relatively good results, but the results were inferior to those in the theoretical case. The reason is that errors in each basic measurement methods are transferred to the combined method. In other words, it is important that the basic measurement method also secures sufficient accuracy at least in each advantageous frequency band. In conclusion, combining the strengths of different methods to create a better alternative is always a good approach, and the method in this paper is meaningful in that it demonstrates one such alternative.