Communication between moving vehicles is very important for safety. In this paper, a bidirectional antenna that can be installed inside a vehicle is proposed and tested in a real vehicular environment at 5.8 GHz. The forward link and backward link seated by two persons and three persons were compared in terms of received RF power and the peak-to-average power ratio (PAR). It was found that, even with three persons, the power link fulfilled the communication requirements using the proposed antenna.
While growth of domestic CM market has slowed down due to economic recession , it recently shows sign of scale as some public agencies are relocating their headquarters. Since the introduction of CM system, a number of client organizations have acquired construction project management capabilities, however, sufficient efforts are not made to estimate the size of construction project management organization. This study drew a method for estimating the size of the organization managing construction project by utilizing statics analysis and project costs per member based on 10 public construction projects and tried to review applicability through case studies. With this study, we would like to make a contribution to achieving smoother work performance and success of the construction project by estimating and allocating proper scale of management workforce.
High transfer additional-axis of robot plays important role in processes that require shorter transfer times, such as hot stamping press process. The intention of this study is to develop a robot additional-axis model which is smaller in size than existing high transfer robot additional-axis, and has the same or better durability and main performance. Dynamic analysis and structural analysis are carried out in the design stage to verify structure stability of drive mechanism according to material and shape.
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