Using a queuing approach to describe a shared memory parallel computer system, it can be considered as a parallel computer system with a shared single ready queue. This can depict a single queue parallel server queuing model. Some models that are based on probability density function have been used to model the performance of the queuing system. This paper uses recursive models to evaluate the ...

ActiveCube is a bi-directional user interface that supports a person's creative work through constructing and interacting with 3-D virtual objects by using actual physical cubes. With this flexible interface, the user can easily construct various 3-D structures in a virtual environment by simply combining the cubes. All of the faces of the cubes are the same and can be connected to any face of ...

Virtual reality is a technology which is often regarded as a natural extension to 3D computer graphics with advanced input and output devices. This technology has only recently matured enough to warrant serious engineering applications. The integration of this new technology with software systems for engineering, design, and manufacturing will provide a new boost to the field of computer-aided ...

Technology aimed at making life easier for game developers is an issue of controversy among security experts. Objections arise out of concerns of stability of a gamefriendly platform. However, this kind of programming interfaces can be used to promote security as well. We use Microsoft’s DirectX platform to access input and output devices directly. Thereby we enable applications to distinguish ...

This paper presents the software infrastructure design for a virtual environment testbed that provides vibrotactile feedback. The process involved identifying system requirements and constraints from an experimental design, the selection of system components, and the development of software modules. The infrastructure interfaces with hardware input and output devices, produces sound and three-d...

Virtual reality offers a new frontier for human interaction with simulation models. A virtual environment, such as that created with a CAVE, imposes either real-time or quasi-real-time performance on the simulation model. Beyond that general requirement, what others can be identified for simulation programs that drive a virtual reality or virtual environment interface? Based on experience with ...

The virtual scissors using virtual hands we propose enable users can cut virtual paper with their own hands. One purpose of our proposal is to facilitate implementing different tools simply by changing software parameters. Another is to make a general-purpose system with small-scale input and output devices for general applications, e.g., only using thin haptic information and force feedback. W...

There are many situations in daily life when a queue is formed. Queuing theory is the mathematical study of waiting lines and it is very useful for analyzing the procedure of queuing of daily life of human being. Queuing theory applies not only in day to day life but also in sequence of computer programming, networks, medical field, banking sectors etc. In this paper, we analyze the basic featu...

in this paper, analysis and simulation of media gateway controller (megaco) based cops (common open policy server) which is a protocol defined in ietf (internet engineering task force) to transport configuration requests and deliver the policies is presented. for this scenario, three queuing models include m/m/1, m/m/c and m/d/c were applied . then, some of the key performance benchmarks look l...