To elaborate, the reality we evolved for was hunter-gatherer culture. This implies certain powerful abilities, but they may not be manifest in an arbitrarily selected current real task. Manually controlling a glass and steel box moving in a crowd of similar boxes at 70 mph without getting killed is a remarkable skill that most of us can perform pretty well, But this does not mean that it is "na...

We present a new compressed representation of free trajectories of moving objects. It combines a partial-sums-based structure that retrieves in constant time the position of the object at any instant, with a hierarchical minimum-bounding-boxes representation that allows determining if the object is seen in a certain rectangular area during a time period. Combined with spatial snapshots at regul...

We present recent X-ray and radio observations of pulsar wind nebulae discovered in EGRET error boxes. Two XMM-Newton observations show the X-ray extent of the rapidly moving PWN associated with the variable γ-ray source 3EG J1809−2328, and a trail coming from the new millisecond pulsar PSR J1614−2230 at high Galactic z. We also briefly discuss three PWN that are HESS TeV sources including a ne...

When composing systems from components we have to deal with involved aspects like synchronization or non-functional properties like performance. It is nearly impossible to clearly specify such aspects in interfaces. Looking behind the interfaces (into grey boxes) does not solve the problem because of lost substitutability. In this paper we explain on the example of synchronization, first, how p...

The non-structure theorems we have discussed in Chapter III rests usually on some freedom on finite sequences and on a kind of order. When our freedom is related to infinite sequences, and to trees, our work is sometimes harder. In particular, we may consider, for λ ≥ χ, χ regular, and φ = φ(x̄0, . . . , x̄α, . . .)α<χ in a vocabulary τ : (∗) For any I ⊆ λ we have a τ–modelMI and sequences āη (fo...

Covid-19 krævede i 2020 og 2021 en omstilling til online undervisning på universiteterne. Denne artikel udforsker, hvordan gruppe studerende undervisere kurset IKT, interaktion organisation Informationsvidenskab, Aalborg Universitet København har brugt oplevelserne fra den digitale omstilling, som grundlag for at gentænke de etablerede didaktiske designs gennem med anvendelse af teknologi. De f...