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This paper looks at developments in the use of learning technologies in UK higher education, particularly in recent years. It examines the agenda items for learning and teaching associated with the use of new technologies that have emerged in the context of the current agenda for quality assessment and assurance. The paper considers the ways in which the two agendas work in a complementary manner, and the ways in which they create tensions. Finally, it considers the likely path of future developments and considers a way forward in which existing tensions may be reconciled.
This contribution presents a time-domain model of the skin depth effect in a lossy
transmission line. The model was developed and implemented in VHDL-AMS for a two wire
edge coupled line but it is general and can be used for other types of lossy
transmission line and high-frequency applications with skin depth effect. The salient
feature of the model is the use of signal variation rate instead of frequency in the signal dependent resistance that models the skin depth losses. VHDL-AMS simulation
experiments are presented to validate the model.
Acquisition of scene features such as depth information and surface orientation is one of the key problems in three dimensional (3D) vision. A common 3D sensing solution is that based upon triangulation, where surface position is perceived from the displacement of a projected point or stripe. To calculate the depth information for a complete scene requires a single projected element to be scanned across the scene. The scanning process makes such data acquisition unsuitable for dynamic scenes where surfaces may be moving.
Illuminating the whole scene with a single projected pattern removes the need for scanning and enables 3D data to be captured at video rate. Matching the imaged pattern elements with those projected is essential if triangulation is to be used to calculate surface position. Due to occlusions or surface discontinuities...
The standard way of visualising protocols using pictures with boxes and
arrows is insufficient to study the protocols in detail. The problem is
that the structuring of the protocols relies on elements not explicit
in the standard visual rendering. To solve the problem one should
visualise not only the operations and the messages but also the state
and the security. Using an object oriented data flow model makes it
possible to explicitly render the security and the state manipulations
of the protocols. The required combination of data flow, object
orientedness and visual programming is provided by the Prograph language.
This language has
been used to build a prototype of some of the protocols in the load
purse transaction of the CEN Inter-sector electronic purse draft
standard. The resulting conformant prototype provides abs...
