• Geotechnical Engineering
• /
• v.12 no.5
• /
• pp.79-88
• /
• 1996

In this study, prediction of soil behavior under vacuum preloading with vertical drain is explored on the basis of numerical models and toe results were compared with field measurements. Reasonable prediction of the time rate of settlements and pore pressure dissipation under vacuum preloading is the maj or concern. The conventional method for vatsuum preloading is based on modeling vacuum preloading as surcharge loading for the consolidation analysis. However, this modeling may violate the real behavior of soils under vacuum loading since the total stress in the analysis varies due to the modeled surcharge loading whereas in'.situ total stress of soils under vacuum loading is constant. In this study a new method is suggested. Instead of modeling vacuum loading as surcharge loading, negative hydraulic head is applied at the surface drain boundary to simulate the vacuum preloading. Comparisons of predictions and field measurements of soil behavior under vatsuum preloading are presented and the usefulness of the new modeling technique is demonstrated.

• Proceedings of the KSR Conference
• /
• 2009.05a
• /
• pp.560-564
• /
• 2009

절도시설과 같은 광역지역 공사 현장에서는 다양한 요인을 갖는 공종별 위험요소가 존재하고 있으나, 현장에서 이를 효율적으로 관리할 수 있는 방안의 수립이 미흡한 실정이다. 따라서 본 연구에서는 철도 관련 실무자들을 대강으로 설문조사를 실시하여 공종별 위험 요인을 도출한다. 이를 통해 RBS(Risk Breakdown Structure)를 구축하고 제시된 RBS에 의한 위험도를 산정한 후 이를 기반으로 VR시스템과의 연동 및 위험관리 체계 구축 방법론을 제시하고 있다. 따라서 현장에서의 주요 공종별 Risk 위험도를 가상환경에서 구현이 가능하므로 위험요인에 따른 시설의 직관적 파악이 가능하다. 또한 시공자들은 나타난 시각화 정보에 의한 Risk에 대비해 효율적인 공사 관리를 이행할 수 있을 것으로 기대된다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2023.07a
• /
• pp.295-296
• /
• 2023

VR 헬스장은 시간적 부담과 이동이 힘든 사람들이 운동을 편안하고 정확한 자세로 할 수 있도록 온라인 헬스와 VR 기기를 접목한 가상현실 기반의 헬스케어 시스템이다. tof 센서가 장착되어 있는 카메라를 통해 주변 지형지물과 실제 몸의 움직이는 모션 정보를 정확하게 전달하여 원하는 장소에서 정확한 자세로 PT를 받을 수 있도록 한다. 원하는 시간과 장소에서 하고 싶은 운동을 할 수 있게 제공하여 시공간에 제약받는 사람도 꾸준한 운동을 통해 건강관리가 가능하여 운동하는 사람이 증가하는 것에 의의가 있다.

• Journal of Digital Contents Society
• /
• v.12 no.4
• /
• pp.519-530
• /
• 2011

This study purposed to interpret subjectivity, which centers on the concept of virtuality embedded in the process of virtualizing contextual awareness and mixing the boundary between realities and virtual realities for renewing the feeling of time and space represented by augmented realities in daily spaces, from the viewpoint of traditional media. By explaining how the reflection of reality is exposed focusing on immediacy and hypermediacy from the viewpoint of media remediation, we found that, different from conventional media, augmented reality enables the screen to function as a part of subject and play a role and, by doing so, converts it to the complete subject of digital media comprehending observers and operators.

• Korean Journal of Construction Engineering and Management
• /
• v.10 no.4
• /
• pp.101-110
• /
• 2009

The current virtual reality(VR) simulation functions in construction project are focused on the construction phase. This study attempts to extend the application of VR functions to the design phase. This study suggests various VR functions such as earthwork simulation by road alignment, alternative route selection simulation, structure type selection simulation and underground structure visualization simulation. These functions can visualize road route and earthwork condition and select an optimal design route by simulating virtual placement of alternative route. This study configures systematic methodology for suggested VR simulation functions and develops VR system by the functions. Finally this study suggests an improved design process of road construction project by using the developed VR functions

• The Journal of Korean Association of Computer Education
• /
• v.4 no.2
• /
• pp.51-61
• /
• 2001

With the advance of computer and communication technologies, a lot of virtual schools provide web-based classes that provide learning environments out of temporal and spatial constraints and many research works on the web-based classes have been proposed. Various techniques are required to build the virtual schools efficiently. One of them is the scheme for transaction management. However, existing transaction management schemes have inappropriate features for supporting web-based classes. In this paper, we propose a new locking-based transaction processing protocol that satisfies the requirements after presenting the requirements for transaction management to support web-based classes. In the protocol, a new method, called mark, is adopted to satisfy the requirements. The proposed protocol also eliminates unnecessary delays or abortions and thus, the proposed protocol can improve the performance of database systems.

• Journal of Korea Multimedia Society
• /
• v.11 no.2
• /
• pp.228-236
• /
• 2008

Recently augmented reality technology has been researched to view the virtual shape of buildings before construction or cultural heritages under recovery. Those researches used special devices or markers that are not applicable in long distanced outdoor environment. Also the server had to compute a lot of transformations for the location changes of virtual objects. This paper proposed a mobile augmented reality system that uses GPS and accelerometer sensors in order to compute the virtual object's locations without using markers. The server determines the position and orientation by comparing the GPS data obtained from the client with the predefined 3D object informations in the server. If the server sends the virtual object informations such as the position, orientation and matching information, then the client matches the virtual object on the screen of mobile camera phone. In addition, the client computes the transformations of location change detected by the accelerometer derived from the user's movement without additional connection to the server.

• The Journal of the Korea Contents Association
• /
• v.21 no.11
• /
• pp.193-202
• /
• 2021

Barrier-free is defined as inclusive design of built environments such as building and its facilities that can be approached, entered and used by persons with disabilities. The purpose of this paper develops the content that can identify the physical barriers in the way of movement and provide information associated with barrier-free by using both Geospatial Information and Virtual Reality technology. For this, we conducted literature reviews to find the tackling barriers in terms of barrier-free access and extracted main functions to construct the content. Then, the prototype model which composed of VR engine and 3D geospatial data was implemented, and finally the utilization of the prototype was checked in accordance with barrier-free scenario. The developed prototype model of this study would be contributed to design the barrier-free of public places and access to public buildings for the mobility-disabled people.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2009.05b
• /
• pp.149-153
• /
• 2009

Today, the form of competition among companies quickly changes in new paradigm. In the past company activity was performed independently, but now dependently. With global age, that change is essential, the introduction of a system that integrates a series of courses is needed for the success of members. Nevertheless, those change are very slow in construction industry, that causes a lot of loss in project process. Construction industry produce structures with collaboration of other industries. There are difficulties that only one company make it, alone. In this trend, cooperation is essential. but the process of original brings a lot of loss From this perspective, this study will prove dependencies of construction industry. Draw out each factor from industrial cooperation, those analyze correlation with system dynamics. In conclusion, this study performs a basic research about 'Integrated Management System' of construction project.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2021.05a
• /
• pp.89-90
• /
• 2021

VE is one of the technologies that are essential to promote cost reduction and performance improvement in construction projects. In the VE process, there are very important steps in deciding whether to adopt VE ideas and alternatives or not. However, when examining the possibility of selecting and adopting alternatives, it is difficult to clarify the differences and characteristics of the existing and improved proposals due to lack of understanding of the owner and inadequate consideration of harmonization with the alternative surroundings. In order to overcome these problems, it is necessary to effectively exchange information related to alternatives among VE participants and to examine the applicability of VE alternatives more in-depth. Therefore, in this study, a process for reviewing the applicability of VE Alternatives using BIM based VR was proposed to review more appropriate VE alternatives.