The generation of bending sequences in a CAPP system for sheet-metal components

An important process-planning task in sheet-metal manufacturing is the determination of bending sequences for individual components. Computer-aided generation of these sequences, as part of a computer-aided process-planning (CAPP) system, can relieve the workload of process-planning departments, this being especially important in small batch manufacturing environments. This paper discusses the functions that have to be performed during the determination of bending sequences, focusing on accuracy aspects. The generation of bending sequences is also put into the broader perspective of an integrated CAPP system such as PART-S, which is under development presently in the author's laboratory

Process planning for small batch manufacturing of sheet metal parts

The paper describes process planning for order-based small batch sheet metal part manufacturing. In this domain, general purpose CNC machinery and standard tools are being used. An example of a process planning system is given and some areas of special interest are discussed in more detail. Process planning for sheet bending and tolerance reasoning are important and intricate tasks within process planning, whereas abstractions in design and nesting are important due to their relations with other manufacturing functions. In general, manufacturing functions tend to become increasingly intertwined and traditional boundaries become blurred. Sheet metal industries, customers and suppliers alike, can benefit from this

A Probabilistic Multimedia Retrieval Model and its Evaluation

We present a probabilistic model for the retrieval of multimodal documents. The model is based on Bayesian decision theory and combines models for text-based search with models for visual search. The textual model is based on the language modelling approach to text retrieval, and the visual information is modelled as a mixture of Gaussian densities. Both models have proved successful on various standard retrieval tasks. We evaluate the multimodal model on the search task of TREC′s video track. We found that the disclosure of video material based on visual information only is still too difficult. Even with purely visual information needs, text-based retrieval still outperforms visual approaches. The probabilistic model is useful for text, visual, and multimedia retrieval. Unfortunately, simplifying assumptions that reduce its computational complexity degrade retrieval effectiveness. Regarding the question whether the model can effectively combine information from different modalities, we conclude that whenever both modalities yield reasonable scores, a combined run outperforms the individual runs

Overzichtsrapport van een driejarig onderzoek naar het gebruik en niet-gebruik van openluchtrecreatieprojecten

Van september 1989 tot en met augustus 1992 zijn op de openluchtrecreatieprojecten Ermerzand (zwem-/surfplas), Geestmerambacht (grootschalige land- en waterrecreatie) en Wilhelminapark (stadspark) objectinterviews en verkeerstellingen gehouden. Verderzijn in de omgeving van de projecten bezoekers en niet-bezoekers thuis geonterviewd. De belangrijkste resultaten zijn: de profielschets van de bezoekers, het werkelijke gebruik, de omvang van het bezoek en de verkeersstromen, en kritiekpunten en wensen van de bezoekers. Ook wordt ingegaan op de achtergronden van het niet-bezoeken van dergelijke projecten. Het rapport besluit met (beleids)aanbevelingen voor grootschalige openluchtrecreatieprojecten

Enzootic geophagia of calves and lambs in Northern Cape and Northwest and the possible role of chronic manganese poisoning

(South African J of Animal Science, 2000, 30, Supplement 1: 105-106