## 6 Use Case Study: Smart Space  
Figure 9 presents the finalized form of the smart space case study in Section 5. This prototype has been developed as a miniature representation of a smart space scenario where multiple sensing devices are deployed to capture the contextual data and an actuating device is deployed to adjust the surroundings in the indoor environment. The prototype consists of the following sensing and actuating devices that are clearly labeled in Figure 9. The technical characteristics of all devices used are illustrated in Table 8. \begin{table}
\begin{tabular}{c c} \hline \hline
**Component** & **Characterization** \\ \hline Hardware & Intel Edison with Arduino Expansion Board \\ Operating System & Android \\ Memory & 1 GB \\ Server & CoAP Server \\ Resources & Fan \\ IDE & Eclipse Luna SR2(4.4.2) \\ Library and Framework & Californium CoAP \\ Programming Language & Java \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Development environment of IoT actuator node server. Figure 9: Experiment environment and use case deployment. The thermistor produced by Tinkerkit is a resistor whose resistance varies significantly (more than in standard resistors) with temperature. The output approaches to 5 V as the temperature rises while approaches to 0 V as the temperature falls down. This module also features a signal amplifier, a standard TinkerKit 3 pin connector, a green LED that indicates the power and a yellow LED whose brightness changes according to the temperature. The relative humidity sensor is the model HIH-4030. With a typical current draw of only 200 uA, it is often ideally suited for low drain, battery operated systems. In addition, the sensor's near linear voltage output makes it possible to direct input to a controller or other device. These two sensors are hung on the west wall of the lab. The GT-1 globe temperature sensor uses a thermistor inside a hollow block sphere, in order to measure mean radiant temperature. This sensor is hung on the north wall near the windowsill at a certain distance from other devices since the mean radiant temperature value can be affected by the presence of the subject or other artefacts. The DSB18B20, put on the windowsill outside the lab, is used to measure the temperature outside. This module provides a unique 64-bit serial code, which makes it easier to control multiple DS18B20s distributed over a large area by using one microprocessor and thus benefits HVAC environment controls and temperature monitoring systems inside or outside buildings. The SKU: SEN0170 is a three-cup wind speed sensor that is located on the desk. It is composed of a shell, the wind cup and the circuit module. Electronic components are all imported industrial chips, which creates extremely reliable electromagnetic interference resistance overall, and can ensure that the host can work normally in most environments. The L9110 fan module unit acts as part of the HVAC system in order to perform the control signals by setting the fan coil speed. It can control positive and negative going motion by setting the logic signals to two pins INA and INB while two other pins are supplied with 5 V and Gnd. The fan module is also put on the desk, used as the only unit for the entire indoor condition without making any modification of the structural configuration. The IoT hardware used to implement the smart prototype is the model Intel Edison, which is a small-sized computer with a processing unit, integrated Wi-Fi, storage and memory. Intel Edison boards have been used as they provide a large spectrum of I/O options for interfacing with physical devices. The proxy is an embedded server, which collects the measurements from other sensors to estimate the PMV index value and generates the control signal to the fan module, and this information is visible through the PC screen. The control system has been tested in a lab of the engineering building of Jeju National University, Korea throughout June in 2017.