Soungho Chae

A Location System with RFID Technology in Building Construction Site

In this paper, the authors explained the overview of data sampling method for development of a location system for workers using RFID technology. Data is the RSSI (Receive Signal Strength Indication) from RFID tag attached to the worker installing a rolling shutter, and was obtained from antennas and RFID readers set around the construction site. Discriminant analysis was done using RSSI collected and the area where worker is performing a task, and a estimation model of the working area was prepared. The model had a range of the percentage of correctly classified from 3% to 30%. The authors suggested the method to make estimate by using integrated models prepared in respect of RFID readers, and showed the percentage of correctly classified of 43.2%. According to the result, the authors confirmed the possibility of the location system with RFID technology, and mentioned the factors necessary to develop for further practical use.

An Estimating Method of Worker's Task with 6-DOF Sensors

Recently construction workers tend to work alone and are getting older. In such working atmosphere, monitoring their works at the site is necessary for keeping task performance quality and accuracy. However, the management and evaluation of workers’ performance can only be done by supervisors’ physical observation. Understanding of their works will be easier if the data that shows what kind of task is performed can be estimated from their body positions and movement, and that enable monitoring by data obtained concurrently. Data for body positions and movements of workers was obtained and measured by using 6-DOF motion sensors, and the method to estimate the type of task by using neural network is described. Finally the authors developed the method to monitor the work at the site using the data obtained by 6-DOF motion sensors and systemized the estimation procedure.

A Study on the Application of VR Technique to Building Construction - Comparisons of Site Photo and VR Image in Construction Progress

Photo taking at an actual job site provides a very useful tool for the record of construction progress and the inspection of built-up members. The photos are also utilized as essential data to carry out the control of construction progress in virtual space. Besides, the situation of construction progress at an actual site might well encounter a conflict with the construction plan that was prepared before the beginning of construction. This invokes the importance of use of site photos in VCS(Virtual Reality Construction Site) that enable the real time construction control by comparing themselves to the images from virtual reality. In this study the comparison between the site photo taken at an actual job site and the virtual images corresponding to them was carried out to estimate validity of the proposed VCS. Particularly this paper demonstrates the possible troubles during development of a prototype system by acquisition of the site photos from an actual job site.

Development of an adaptable system for effective utilization of architectural space

In this paper, the authors referred to the development of the suitable modification technology of architectural space in alignment with change in circumstance surrounding lifestyle of residents as necessary. A design method of architectural space and building elements, and a handling method of structural objects of having used robotic technology are proposed as a proposal of adaptability of building. The development and design of a Floor Adaptable System (FAS), which can modify architectural space by moving up and down of floor units, was performed. The Floor Adaptable System installation and test operation was done in WABOT-HOUSE, and showed the operation process. According to the result, the authors confirmed the possibility of the Floor Adaptable System with hydraulic jacks, and mentioned the factors necessary to develop for further practical use.

A STUDY OF WIRELESS LAN BASED WORKING AREA ESTIMATION

A wireless LAN (local area network) was proposed as a means of determining location at a construction site. The high prevalence of equipment and facilities was offered as an advantage compared to existing methods. An experiment was performed to collect RSSI (radio signal strength indications). From the results, variations were shown in RSSI from radio signal transmission conditions, and the application of wireless LAN was discussed.