Existing cognitively based computational models for wayfinding focus primarily on the exploration of mental representations rather than the information needs for wayfinding. It is important to consider information needs because people trying to find their ways in unfamiliar environments do not have a previously acquired mental representation but depend on external information. The fundamental t...

The purpose of this paper is to attempt to clarify the concept of affordances, as introduced by Maier and Fadel, to relate affordances to function, to try to reduce confusion about both of these terms by providing a detailed model, and to expose some of the existing research on function to a wider audience. The paper starts by constructing a model of function that relates devices to an environm...

It provides an object-relational mapping approach that lets you declaratively define how to map Java objects to Generate a Java Model from an XML schema. In this research, we propose a new technique to convert the relational database contents and schema into XML schema (XSDXML Schema Definition),. We currently use.NET DataSet.ReadXmlSchema() function to convert a XML schema into a relational st...

Group signatures, introduced by Chaum and van Heijst, allow members of a group to sign messages anonymously on behalf of the group. In this paper we show, how any digital signature scheme can be converted into a group signature scheme. This solves an open problem posed by Chaum and van Heijst. To obtain this result, the encrypted identity of the signer is signed together with the message. The c...

Pneumatic instrument systems powered by high-pressure natural gas are often used across the natural gas and petroleum industries for process control. Typical process control applications include pressure, temperature, liquid level, and flow rate regulation. The constant bleed of natural gas from these controllers is collectively one of the largest sources of methane emissions in the natural gas...