This paper addresses issues in realizing a whole-body tactile display system. Individual wiring for each actuator requires many wires and presents a dilemma of durability and flexibility. Wireless transmission can eliminate these wires; however, practical wireless power supply to drive actuators is not currently available. Two-dimensional (2-D) communications on conductive textiles enable DC supply and data transfer while suppressing interference with other radio communications. Previously, a concept of multi-carrier frequency modulation (FM)-based vibrotactile waveform transmission on conductive textiles has been presented. However, practical implementations, in particular how to implement realtime multi-carrier FM, have not been clarified. In this paper, we propose a software-defined radio (SDR)-based multi-carrier FM transmitter capable of transmitting non-preprogrammed arbitrary waveforms of vibrotactile sensation.

This paper proposes a novel environmental monitoring strategy, incremental environmental monitoring, that enables scientists to reveal the ecology of wild animals in the field. We applied this strategy to the habitat of endangered freshwater fish. Specifically, we designed and implemented a network-based system using distributed sensors to continuously monitor and record the habitat of endangered fish. Moreover, we developed a set of analytical tools to exploit a variety of sensor data, including environmental time-series data such as amount of dissolved oxygen, as well as underwater video capturing the interaction of fish and their environment. We also describe the current state of monitoring the behavior and habitat of endangered fish and discuss solutions for making such environmental monitoring more efficient in the field.