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In this paper, the tracking type floating PV energy generation system is studied and developed to improve the generation efficiency. First of all, to find suitable material for members of floating type PV energy generation system, suitability analysis for several materials such as a steel, aluminum, polyethylene (PE), and fiber reinforced polymer plastic (FRP) is conducted. Then the design for tracking type floating PV energy generation system is also conducted. The tracking type floating PV energy generation system is designed, fabricated, and installed at Hapcheon dam, Korea. Finally, to estimate the energy generation efficiency of tracking type floating PV energy generation system, comparison with land fixed type PV energy generation system is performed. As a result of the comparison, it is confirmed that if the period of operating PV energy generation system is longer, the economic efficiency of tracking type will be higher than that of land fixed type.

This paper addresses a method to transmit streaming data via rolling shutter camera-based optical camera communications (OCC). Since the amount of data that can be contained within one frame is limited, and the continuity of received data cannot be guaranteed due to OCC environmental variations, we introduce the concept of dividing the streaming data into several fragmented sets that are transmitted sequentially. We propose a superframe to contain sequential packets of fragmented data and corresponding indexes, so that sequential packets for streaming data can be continuously collected. When redundant frame transmission is considered, any packet lost due to OCC environmental conditions can be recovered. Experimental results show that the proposed method can be successfully used to transmit streaming data, with the number of redundant frames required to acquire all data packets based on image resolution. In addition, we describe how to identify missing packets from a network point of view to reduce the number of redundant frames needed to acquire all the data. This paper presents baseline results of communication performance when sending streaming data via a rolling shutter-based OCC.

The pultruded fiber reinforced polymer plastic (PFRP) is one of the most actively studied materials for structural member in construction industries. In this study, a buckling analysis of PFRP plate is conducted by two analysis methods. First, a buckling strength of PFRP plate is calculated by the exact orthotropic plate buckling analysis. Second, simplified buckling analysis for PFRP plate is conducted by using approximate orthotropic material properties. The approximate orthotropic material properties are geometric mean value of longitudinal and transverse material properties of original PFRP plate. As a result of buckling analysis, buckling strength of PFRP plate for each analysis method can be obtained. From the comparison between these results, advantages and disadvantages of each analysis method are discussed. In addition, it is also discussed whether the simplified buckling analysis method for PFRP plate is applicable for the design.