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, 1994), it is likely that such learners would perform most poorly when interacting with the Internet Therefore, factors such as redundancy, extraneous material, and placement of information may not only influence learning for viewers of multimedia but also for viewers of websites However, until researchers directly examine the impact of these factors when learners with limited domain knowledge use the Internet, we cannot be certain whether the negative learning outcomes are generally true of this resource..

Misting will occur when the surface temperature of the transparency falls below the dew point of the surrounding air. Misting typically occurs when an aircraft which has been cruising at an altitude where air is cold and relatively dry. When the aircraft descends into a warmer and more humid atmosphere, misting will occur on the surfaces which have not had enough time to warm up to a temperature above the dew point of the air. An anti-misting system can be provided to keep the surface temperature of the transparency above the dew point and thus prevent misting. A system of nozzles blowing air at about 100 C over the canopy from its base can be used, or alternatively an electrically heated gold or metal oxide lm can be deposited on the transparency surface or placed between laminations. A transparency de-mist system can be provided to clear the transparency of mist should misting occur suddenly, or if the anti-mist system fails. This is particularly important on landing for aircraft where the pilot is tightly strapped into his seat and cannot clear the screen with his hand. The de-mist system consists of nozzles blowing environmental control system air at high ow rates across the transparency.

An example of a poorly designed multimedia presentation is one that includes redundant information. Mayer, Heiser, and Lonn (2001), for instance, 258

Aircraft icing is an extremely important factor in the world of aviation and despite the best efforts of the industry there are still continuing accidents resulting from inadequate protection against the impact of icing on aircraft controllability. Icing is caused either by the freezing on to aircraft surfaces of some from of precipitation, this usually occurs on the ground; or by supercooled liquid water droplets found in clouds or rain solidifying on impact with aircraft structure, which is at a suf ciently low temperature, during ight. This accretion occurs on areas of the airframe where the air ow is near to stagnation, i.e. close to a rest, such as wing or tailplane leading edges, engine intakes or helicopter rotor blade leading edges. The factors determining rate of accretion are complex but include the temperature of the surface, its radius and sweep, the size and

Domain Knowledge and the Internet investigated whether the performance of college students with low domain knowledge would be negatively impacted when multimedia contained redundant information. Novices were exposed to one of two 140-second multimedia presentations. One group was shown how lightning works by using animation and narration only. The remainder of the participants viewed the same presentation but with the inclusion of on-screen text, a duplication of the narration. Performance on both recall and problem-solving transfer tests were superior when the on-screen text was not included. This same pattern of results was found when the multimedia presentation s length was increased twofold (Moreno & Mayer, 2002). As knowledge increases, however, performance differences due to formatting tend to disappear (Kalyuga, Chandler, & Sweller, 2000). Specifically, trade apprentices performed the same on recognition tests regardless of whether they were exposed to the material using illustration-text-and-narration, illustration-and-text, illustration-and-narration, or illustration only (Kalyuga et al., 2000). When knowledge becomes high, however, experts tend to do better when provided with the illustration only in comparison to the illustration-and-narration. Kalyuga and colleagues (2000) claim that for experts the narration provides the same information as the illustration and thus is classified as redundant information. In effect, the narration, if attended to, increases the cognitive load for these learners. Mayer et al. (2001) suggested that the detrimental effects associated with redundant information is attributable to the allocation of cognitive resources to processing both the narration and the on-screen text as separate sections of information. This may require more cognitive resources than is available; learners, therefore, especially novices, may quickly experience cognitive overload. Highly knowledgeable learners, on the other hand, may be able to recognize and ignore repetitive information, allowing them to efficiently process the material.

By de nition, an access pattern will be skip-sequential if a set of noncontiguous rows are scanned in one direction. The I/O time per row will thus be automatically shorter than with random access; the shorter the skips, the greater the bene t. This would occur, for example, when table rows are being read via a clustering index and index screening takes place, as we will see in due course. This bene t can be enhanced in two ways: 1. The disk server may notice that access to a drive is taking place sequentially, or almost sequentially, and starts to read several pages ahead. 2. The DBMS may notice that a SELECT statement is accessing the pages of an index or table sequentially, or almost sequentially, and starts to read several pages ahead; this is called dynamic prefetch in DB2 for z/OS.