Representation of drawings in CAD systems can cause problems during design collaboration. The notion of re-representation is proposed as one way of addressing these problems. Furthermore, re-representation is one way of allowing emergence to occur; emergence is an important aspect of collaborative computer-mediated design. Based on the concept of re-representation a model for collaborative CAD ...

■ Abstract The transition from the Middle Paleolithic to the Upper Paleolithic is considered one of the major revolutions in the prehistory of humankind. Explanations of the observable archaeological phenomena in Eurasia, or the lack of such evidence in other regions, include biological arguments (the role of Cro-Magnons and the demise of the Neanderthals), as well as cultural-technological, an...

we can improve the performance of distributed systems by load sharing (i.e., distribute load from heavily loaded nodes to lightly loaded ones). Adaptive load sharing policies take system state into account in making job distribution decisions. We can maintain the state information in one of two basic ways: distributed or centralized. This paper discuss on distributed systems which rely on eithe...