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Java Server Faces
(2004)
OBJECTIVES:
To generate a fast and robust 3-D visualization of the operation site during minimal invasive surgery.
METHODS:
Light fields are used to model and visualize the 3-D operation site during minimal invasive surgery. An endoscope positioning robot provides the position and orientation of the endoscope. The a priori un-known transformation from the endoscope plug to the endoscope tip (hand-eye transformation) can either be determined by a three-step algorithm, which includes measuring the endoscope length by hand or by using an automatic hand-eye calibration algorithm. Both methods are described in this paper and their respective computation times and accuracies are compared.
RESULTS:
Light fields were generated during real operations and in the laboratory. The comparison of the two methods to determine the unknown hand-eye transformation was done in the laboratory. The results which are being presented in this paper are: rendered images from the generated light fields, the calculated extrinsic camera parameters and their accuracies with respect to the applied hand-eye calibration method, and computation times.
CONCLUSION:
Using an endoscope positioning robot and knowing the hand-eye transformation, the fast and robust generation of light fields for minimal invasive surgery is possible.
The strong technical orientation of the previous multimedia evolution shows a lack of theoretical foundation. Both during the evolution and application of multimedia technology, well-founded theoretical concepts are missing. The intention of this paper is to show categories of different information representations and interaction types and their strengths in representing contents. A classification of multimedia information and interaction types is given also as an
overview of the problem fields of multimedia, especially in the field of learning theory. This classification is used to give some guidelines for using and combining multimedia contents in multimedia systems.
The assumptions relating to power flow as a function of position and number of fasteners between the gypsum board and RC's was examined. It was observed that studs had both a rotational and translation motion but the translation displacement coupled more strongly than rotation. It was also observed that if the rotation velocity was less than or equal to the translation velocity, then structure borne transmission due to the rotation component could be ignored for frequencies below 2500 Hz. The results show that there is little effect associated with either the location or the number of fasteners attaching the gypsum board to the RC's about 315 Hz.
The simplifications used while creating a model for structure borne transmission from a wood stud to a gypsum board mounted on RCs are discussed.
Above 400 Hz power transmission is determined by stud translation, is propotional to the number of RCs, and is independent of number and location of fasteners between gypsum board and RCs.
In this frequency range it is possible to use the mobility approach if RCs can be approximated by a series of idealised springs located at points of intersection between stud and RCs. The dynamic stiffness of each spring is equal to that of the RC at a stud.
The reexposure of a subset of learned material as a retrieval cue can impair recall of the remaining material. Like part-list relearning—the reexposure of learned material for additional learning—this part-list cuing is often assumed to be the result of output order biases at test, caused by the increased strength of the reexposed material. We directly compared the effects of cuing and relearning when controlling for output order biases. In addition, we compared the two forms of reexposure with the effect of part-list retrieval. Both part-list cuing and part-list retrieval reduced recall performance for the remaining material. By contrast, part-list relearning had no such detrimental effect. These results indicate that the effect of reexposure depends on whether material is reexposed as a cue or for relearning, suggesting that part-list cuing reflects an instructional effect. Evidence is provided that part-list cuing leads to instructed covert retrieval of cue items and causes retrieval inhibition of noncue items, similar to how overt retrieval inhibits nonretrieved items.
Process Modelling with ARIS®
(2004)
Dieser Beitrag beschreibt, wie Referenzarchitekturen die MDA nutzbar machen. Die Referenzarchitekturen liefern dabei die konzeptionelle Unterstützung für die Konstruktion und Implementierung von Software und die MDA bietet den Rahmen für eine Werkzeugunterstützung. Die praktische Umsetzbarkeit wird mit dem OpenSource Framework AndroMDA und einer Referenzarchitektur der Firma iteratec GmbH gezeigt.
Trockenbau-Atlas: Teil I
(2004)