Wireless Sensor and Actuator Networks for Lighting Energy ...

commercial system was randomized for the second test. If the research system was
presented to the participant first, the test session would start with the first test by letting
the participant choose the sensor locations, and then the second test on the research
system followed without interruption. During the intermission after the test on the
research system and before the test on the commercial system, the investigator would
finish the data gathering part of the sensor placement test while the participant took a
10-minute break outside the office. Likewise, if the commercial system was tested first,
the sensor placement test would be executed after the 10-minute intermission. When the
participant had determined the locations of the sensors, the test on the research system
began right away. The investigator only took sensor and meter measurements to
complete the sensor placement test after the subject had done the test and left. For the
sake of clarity, the two tests are divided and discussed in separate sections in Chapter
8.3 and 8.4. The complete protocol narrative and a list of all the materials used in this
human subject test are attached in Appendix B.
8.2 System Setup
Figure 8-1 shows the physical layout of the office space implemented with the
lighting systems. The office is approximately 10-by-14, with a 142 ceiling. It
contains various sizes of bookshelves, file cabinets and file holders. Two desks are
placed against the walls so that the office fits two occupants sitting back to back. There
is a single 6-by-3 window covered with a blind, as indicated on the right-most wall
in Figure 8-1. The walls are painted ivory with decorations of picture frames. The
ceiling is also ivory and the floor is covered with beige tiles, which are a bit darker in
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