In this study, we identify promising, currently vacant technologies for a Truck on Flatcar or Truck on Freight Train (TFTFT) system by analyzing the relevant patent information. We then apply network analysis from macro- and microperspectives to establish technology development strategies. We first researched the patent database from the United States Patent and Trademark Office (USPTO) by extracting relevant keywords for the TFTFT system. We then preprocessed the patent data to develop a patent-International Patent Classification (IPC) matrix and a patent-keyword matrix. Next, we developed a generative topographic mapping (GTM)-based patent map using the patent-IPC matrix and detected any patent vacuums. Then, in order to confirm the promising patent vacuums, we technically examined criticality and trend analyses. Finally, we designed an IPC-based network and a keyword network with promising patent vacuums to derive a technology development strategy from a macro- and microperspective for the TFTFT system. As a result, we confirmed two promising patent vacuums. The patent vacuums found were defined as the technical field of rail vehicles suitable for TFTFT systems and the technical field of equipment and systems for freight transfer to rail vehicles. The proposed procedure and analysis method provide useful insights for developing a research and development (R&D) strategy and technology development strategy for a TFTFT system.

To enhance the control performance of tilting ride comfort, the predictive tilting control techniques has been developed based on GPS database, accelerometer and gyroscope on board train. An existing tilting control has been used a data base which was put line information into the control system manually linked to the ground marker for detecting of train position. For ease of maintenance, the automatic data base connected to GPS was used on the tilting control no need to make any change in line information. In this paper, in order to evaluated the riding comfort of this method, the trial run test was performed in the Gyeongbu line(between Seoul and Susan), which is considered for tilting train commercial service. Tilting train express(TTX) was tested to run at design speed 200 km/h and at service speed 180 km/h. We analyzed the riding comfort of tilting control on curves to get the potential of a speed up. In this approach, we obtained very clear results that made standard of riding comfort satisfied.

Han SH. Korean J Orthod. 2014 Nov;44(6):279-280. http://dx.doi.org/10.4041/kjod.2014.44.6.279