In this study, we designed and implemented a protection application utilizing baby play mat. Proposed application can be configured contents to educate and play a crossword puzzle. While parents and children are away for a while, it is possible to observe play behavior of children and control contents with a smart-phone leveraging the Internet of Things(IoT) technology. The mat is designed to play the play-based education contents or the game for children(aged 0-3). The computing environment of the smart play mat was building by utilizing RFID, Arduino and sensors. This study is expected to be used in various places that require protection of children such as the child-care center, nursery and preschool.

We propose a technique to implement multi-user game environment based on Android platform using Unity™ without relying on conventional Unity network plug-ins, which are often on a commercial basis. Since our proposed method utilize own native Android™ codes based on the Android SDK to facilitate network communication among game players, the proposed technique provides with higher flexibility and more transparency than general Unity network plug-ins, which are almost impossible to customize. One of our main ideas for implementation is to deploy the Unity binary code and the native Android network implementation as a layer respectively on the Android platform. Based on our method, we have implemented a mobile multi-user game on Android devices. Also, we discuss our technique according to the Unity’s design philosophy, “one code for multi-platforms.”