Acoustic measurements taken in a flow impedance tube are used to assess the relative accuracy of two waveguide methods for impedance eduction in the presence of grazing flow. The aeroacoustic environment is assumed to contain forward and backward-traveling acoustic waves, consisting of multiple modes, and uniform mean flow. Both methods require a measurement of the complex acoustic pressure pro...

We view match as an operator that takes two graph-like structures (e.g., XML schemas) and produces a mapping between the nodes of these graphs that correspond semantically to each other. Semantic schema matching is based on the two ideas: (i) we discover mappings by computing semantic relations (e.g., equivalence, more general); (ii) we determine semantic relations by analyzing the meaning (con...

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Please read: I will try to post here a few solutions (or answers). The new solutions will be added to this same file. They might come with no explanation, just the “answer”. If yours do not match mine, you can try to figure out again. (Also, read the disclaimer below!) You can come to office hours if you want explanations for the unexplained answers. Be careful that just because our “answers” w...

The field of special effects in post-production has undergone an exciting period of innovation in recent years. There has been a surge in demand for camera tracking or “matchmoving”. A number of companies have built manual matchmoving products, and more recently automatic matchmovers have come to market. We will discuss the nature of the problems that the industry requires solved, and the produ...

A perforated plate with stepwise apertures (PPSA) is proposed to improve sound absorption for low frequencies. In contrast an ordinary insufficient acoustic resistance and small mass, the stepped holes could match of air characteristic impedance also moderately increase mass especially at Prototypes made by 3D printing technology are tested in tube. The measured results agree well that predicti...

Recent techniques for multi-camera tracking have relied on either overlap between the fields of view of the cameras or on a visible ground plane. We show that if information about the dynamics of the target is available, we can estimate the trajectory of the target without visible ground planes or overlapping cameras.

Please read: I will try to post here a few solutions. The new solutions will be added to this same file. They might come with no explanation, just the “answer”. If yours do not match mine, you can try to figure out again. (Also, read the disclaimer below!) You can come to office hours if you want explanations for the unexplained answers. Be careful that just because our “answers” were the same,...

This article describes an investigation using automatic generation of heights over a typical Danish landscape. For this investigation the program Match-T has been used. The investigation is carried out over a test area of 3.5 x 4.0 km. The area represents more than 80 % of what could usually be termed typical Danish landscape. The test area is divided into five different landscape types. Over t...

Please read: I will try to post here a few solutions. The new solutions will be added to this same file. They might come with no explanation, just the “answer”. If yours do not match mine, you can try to figure out again. (Also, read the disclaimer below!) You can come to office hours if you want explanations for the unexplained answers. Be careful that just because our “answers” were the same,...