In wireless sensor networks (WSN) systems, various indoor environmental parameters can be monitored in real time by an RF wireless sensor module. A wireless sensor module with several sensors is developed for an indoor environment monitoring system. ZigBee is a wireless standard for personal area network (PAN) sensor monitoring and control, also known as IEEE 802.15.4. In this paper, we designed a wireless sensor module that had a ZigBee communication module and a sensor module for monitoring a room or an office environment using WSN. The sensor module has various enlargements for various types of sensors, for example, a humidity sensor, temperature sensor, and O 2 and CO 2 sensors. Using ZigBee technology of 2.4 GHz Industrial, Scientific, and Medical (ISM) band, we could monitor the information from terminal PC modules that are attached to the wall of an office or a room. A wireless sensor device was developed to circuit schematic using PowerPCB tool PADS and made it a printed circuit board (PCB). From the results of our tests, we confirmed that the designed wireless sensor module and room monitoring system can supply a comfortable environment for people by monitoring the indoor environment.

With current developments in virtual reality technology and advances in the marine industry, various virtual underwater simulation systems that help users to indirectly experience the marine environment via a variety of virtual contents are being developed. In general, underwater simulation systems that use virtual reality developed using three-dimensional graphics technology. Therefore, they are limited in terms of their ability to imbue users with a sense of immersion and presence. In addition, the expansion of the sensory range, with which users can actually experience various underwater environmental phenomena while they are in underwater simulations, is still insufficient. This paper proposes an immersive multisensory effect reproduction system that provides an improved sense of underwater reality for users. The results of comparative user evaluation tests conducted regarding the sense of reality imbued with our proposed system indicate that its sensory presence effect is superior to that of conventional systems.

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