Location awareness is a key feature of mobile information systems. Typically, location is determined by interpreting a set of measured positions. Various approaches for position determination do exist. They vary greatly in their precision, applicability, and energy requirements. As mobile devices are battery-driven, energy is one of the most limiting factors for the system’s uptime. Locations h...

Subscribers in future personal communications system (PCS) networks will be assigned portable personal numbers, or non-geographic phone numbers (NGPNs), which will not indicate the service provider and home location register (HLR) database which serves the subscribers. A location management scheme for future PCSs based on a three-level hierarchical database architecture, which consists of a dir...

Agent based micro-mobility protocols such as Hierarchical Mobile IPv6 deploy special IPv6 nodes called Mobility Agents that act as an anchor point between the Mobile Node and the Home Agent providing localized mobility support. The location and the number of MAs deployed within the network can affect the performance of the protocol. This paper deals with the problem of Mobility Agent (MA) locat...

Despite an extensive literature on the determinants of the foreign location choices by multinational companies, researchers have only recently begun to systematically examine how these companies form their location consideration sets. When considering new foreign locations, do firms evaluate the attributes of the alternatives at the national level, the sub-national regional level, at some other...

Many mobile applications require some knowledge about the current geographic locations of the mobile objects involved. Therefore, services exist that can store and retrieve the position of mobile objects in an efficient and scalable way. More advanced location-aware applications, however, require additional functionality, like determining all mobile objects inside a certain geographic area (ran...

The objective of the present paper is to review my personal contributions in the field of uncapacitated facility location problems. These contributions took place throughout my academic career, from the time I was a Ph.D. student at Imperial College to the present day. They cover approximately 30 years, from 1973 to 2003; they address: algorithms developed for the p-median problem and for a gen...

Location models require a well-defined representation of spatial connectivity and hierarchical relationship between different spatial concepts; and are fundamental for location navigation, location based services and contextual query responses. Current location models rely on a priori knowledge of surrounding environment and mostly the semantics of relationships are over-looked. In this paper w...

Distributed intrusion detection systems are especially vulnerable to attacks because the components reside at a static location and are connected together into a hierarchical structure. An attacker can disable such a system by taking out a node high in the hierarchy, thus amputating a portion of the distributed system. One solution to this problem is to cast the internal nodes in the system hie...

abstract purpose of this paper: the objectives of this paper are two folds: (1) utilizing hierarchical fuzzy technique for order preference by similarity to ideal solution (topsis) approach to evaluate the most suitable rfid-based systems decision, and (2) to highlight key risks and benefits of radio frequency identification technology in healthcare industry. design/methodology/approach: resear...

Determining user geolocation from social media data is essential in various location-based applications — improved transportation/supply management, through providing personalized services and targeted marketing, to better overall experiences. Previous methods rely on the similarity of posting content neighboring nodes for geolocation, which suffer problems of: (1) position-agnostic network rep...