No abstract

A detailed magnetic survey has been carried out in the northern Tai wan area in order to determine the topographic surface of the magnetic basement. This survey covers an area of about 900 km2, and totally the observation point is 269. After geomagnetic corrections of the observed data, the magnetic anomaly map was obtained. For the purpose of resolving the deeper (relative to the shallow effects) magnetic basement, a low-pass filter was applied to the magnetic anomaly to obtain a smoothed magnetic anomaly. Thirteen profiles were designed to cross and cover evenly the smoothed geomagnetic anomaly in the study area. These geomagnetic anomaly profiles were inverted to obtain the magnetic basement profiles by trial and error method. Compiling these 1-D magnetic basement profiles, we outlined the 2-D magnetic basement relief. The pattern of the relief of the geomagnetic basement shows that the depth is ranged from 2.6 to 6 km. There exists a basement high under the Tatun volcano area. Compiling with the topographic relief, we can find that they correlate to each other well, except for a contravention in the mountainous area surrounding the Taipei basin. This converse can be explained by supposing that tectonic forces lifted the mountainous area after the basement was formed. In order to verify the "truth" of the solution, we calculated the theo retical geomagnetic anomaly using the model we have inverted. Compar ing the result with the observed geomagnetic anomaly map, we can find that they. are quite similar to each other, with only a small variance.

Somatosensory interaction is a kind of man-machine interfacing technique for information acquisition through human postures, which are widely used in digital art nowadays. To create opportunities for the visually impaired to enjoy digital art, two sound art systems named Dynamic Sound and Concrete Sound, which are based on somatosensory technology, were designed in this study for the visually impaired to appreciate with pleasure. The former system emphasizes resonances between humans and sound, allowing the visually impaired user to trigger different sounds by hand gestures which promote the user's physio-pleasure and ideo-pleasure. The latter system, also being controlled by hand gestures, combines sounds with three-state physical phenomena as feedbacks which are explained orally by an accompanying person to the visually impaired user, creating an inter-person communication that promotes the user's socio-pleasure. By public exhibitions, users' feedbacks were acquired via interviews, and evaluated to prove the effectiveness of the proposed systems with the following findings: 1) interactions by hand gestures offers the visually impaired with opportunities to enjoy digital art; 2) sound art provided by the systems allows the visually impaired to gain pleasure via man-machine interactions; 3) the systems innovatively integrate dynamic visual performances with auditory feedbacks in the interaction process; and 4) through the development of gesture operations, more performance techniques can be devised for sound art, allowing gesture motions to replace control interfaces in future designs.