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Multi-User Virtual Environments For general involvement with Whyville activities, our students showed a shift towards the social rather than science activities with time. That is, repeated measures analyses results showed that students did not differ across time in terms of their involvement with general science activities, reading the Whyville Times, nor reading the bulletin boards. However, students indicated that they were significantly more involved with signing petitions or participating in polls on Whyville at Time 2 and Time 3 than earlier in the study. The social activities in Whyville became more prominent with time. That is, using Time 1 as the baseline, students reported significantly greater involvement with chatting, ymail, and hanging out at social places at Time 2 and Time 3. In addition, these students also indicated that shopping at Akbar s or picking your nose occurred with significantly greater frequency at Time 2 and Time 3 than at Time 1. Because much of Whyville involves communications through personalizable avatars, and personalization occurs at Akbar s and the picking your nose site, these last activities can be consider both personal and social motives.

For science games, students reported their rate of participation only at the beginning (Time 1) and end (Time 3) of the study. For each science game, students indicated whether they never tried it, tried it, done it, or felt like an expert. To measure science game experience, these responses were subsequently scored on a four-point scale, with higher scores indicating greater experience. Frequencies and means of science game participation are reported in Table 8.2. Results showed the majority of students at Time 1 responded that they either never tried or tried most of the science games. The high experience rate for the two Spin Lab games (Skater game and Spin game) and Hot Air Balloon race were caused by the teacher s initial classroom activity and discussion of Whyville. At Time 3, results showed that most students indicated that they tried it, done it, or felt like an expert on almost all of the science games. The one exception was the Solstice Safari game that required coordination from Whyville users and website designers to organize their occurrence. For this reason, experience in it was generally low. To analyze change in science game experience, paired sample t-tests were conducted for each game (see Table 8.3). Results showed that students rates of experience were significantly higher at Time 2 for most of the science games. The only non-significant time differences were for the Hot Air Balloon and Solstice Safari games.

Remote Terminal A to Remote Terminal B Transfer ~ 120 microseconds Bus Controller Remote Terminal A Remote Terminal B Transmit Command Receive Command Next

Table 8.2. Expertise in playing casual science games. Time Frequency ( ) Time Frequency ( ) Time Frequency ( ) Time Frequency ( )

more data words up to a maximum of 32 words. In the example shown in the upper part of Figure 12.12, transfer of one data word from the RT A to the BC will take approximately elapsed time of about 70 seconds. For the transfer of data from between RTs as shown from RT A to RT B, the BC sends a receive word to RT B followed by a transmit word to RT A. RT A will send a status word plus a data word (up to a maximum of 32 words) to RT B which responds by sending a status word to the BC, thereby concluding the transaction. In the simple RT to RT transaction shown in Figure 12.12 the total elapsed time is around 120 seconds for a single data word which appears to be rather expensive in overheads. However if the maximum of words had been transferred the overheads would be the same, though now representing a much lower percentage of the overall message time. For further reading on MIL-STD-1553B see reference [5].

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ARINC 629 (A629) like MIL-STD-1553B is a true data bus in that the bus operates as a Multiple-Source, Multiple Sink system (see Figure 12.13). That is, each terminal can transmit data to, and receive data from, every other terminal on the data bus. This allows much more freedom in the exchange of data between units in the avionics system than the Single-Source, Multiple Sink A429 topology. Furthermore the data rates are much higher than for A429 where the highest data rate is 100 kbits/sec. The A629 data bus operates at 2 Mbits/sec or 20 times that of A429. The true data bus topology is much more exible in that additional units can be fairly readily accepted physically on the

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Until recently the only practical means of supplying oxygen during ight has been from a cylinder or a liquid oxygen bottle. This has several disadvantages, particularly for military aircraft. It limits sortie duration (fuel may not be the limiting factor if in- ight refuelling is used), the equipment is heavy and the bottles need replenishing frequently.

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