In this paper we present a different view of user interaction with virtual worlds. We start from the question: how can we bring more natural object behavior into virtual environments? Currently, objects in VR applications often behave in a very un-natural way. Incorporation of physical laws in the virtual environment, together with monitoring natural user actions and behavior is desirable. We p...

The area on a horizontal working plane usable for direct manipulation or direct touch user interfaces is constrained within the space reachable by the users. This paper shows that existing models of reach in the literature are suitable for use in user interface design. While existing data was gathered for stationary individuals this paper examines the impact of freedom of motion on the maximum ...

Despite the widespread adoption of Internet banking there are no validated guidelines on the functionality the younger, techno-savvy Generation-Y customer segment (18-35 year age bracket) expect from Internet banking websites. This research investigated the functionality the Generation-Y customer segment require from South-African Internet banking websites. The User Centred Design (UCD) philoso...

Movie directors and designers of displays for process control have one thing in common: they must display the inner state of a complex system in an understandable way to a group of spectators/operators that do not have direct access to the interior of the system. The paper redefines the three basic filmic units, cut, scene and sequence, and presents five topics from film theory that may give in...

This review paper discusses power quality considerations for direct current (DC) electric power distribution systems, particularly DC microgrids. First, four selected sample DC architectures are discussed to provide motivation for the consideration of power quality in DC systems. Second, a brief overview of power quality challenges in conventional alternating current (AC) distribution systems i...

The perform ance and stability of a slotted direct-sequence spread-spectrum multiple-access (DSSSMA) packet radio network employing the type-II hybrid automatic-repeatrequest (ARQ) protocol with ® nite-length transm itter buffers are considered. The equilibrium point analysis (EPA) technique is employed to analyze the system stability and to approxim ately compute the system throughput, delay, ...

This paper addresses the designers’ activity and in particular the way designers express an object shape in 2D sketches through character lines. The tools currently available in commercial CAS/CAD systems to manipulate the digital models are still not sufficiently suited to support design. In this paper, we introduce the so-called Fully Free Form Deformation Features (δ-F), able to take into ac...

One of the major issues of mesh generation today is access to CAD geometry in an accurate and efficient manner. This paper will provide an overview the process of accessing CAD geometry for mesh generation and will review several of the issues associated with accessing CAD geometry for mesh generation. This paper will also evaluate alternative techniques for accessing CAD geometry and review ho...

Work psychologists have introduced a concept, in which dialog design is a part of task design. A set of criteria of user-oriented dialog design is presented here. These criteria are consistently integrated into a control concept. Empirical investigations on some of these criteria are then described. In an experiment to prove the criteria transparency , a desktop interface (high transparency) an...

This paper argues that delicate interpretation, illusion, and feedforward as three key concepts in designing future multimodal interaction. The human brain has its peculiar nature of integrating information coming through different sensory channels to construct a consistent model of the world. The notion of direct manipulation and feedback based on the truthful reflection of the physical world ...