Mobile computers often beneet from software which adapts to its location. For example, a computer might be backed up when at the ooce, or the default printer might always be a nearby one. In many existing systems, location-triggered actions are only possible for speciic applications or with special infrastructure. This paper describes lcron, a system which supports user-conngurable actions trig...

The problem of fault location has been studied deeply for transmission lines due its importance in the power system. Nowadays the problem of fault location on distribution systems is receiving special attention mainly because of the power quality regulations. This paper presents some of the most relevant methods for fault location in radial power systems. Additionally here is presented an hybri...

In this article we focus on approximation algorithms for facility location problems with subadditive costs. As examples of such problems, we present two facility location problems with stochastic demand and exponential servers, respectively inventory. We present a (1 + , 1)-reduction of the facility location problem with subadditive costs to a soft capacitated facility location problem, which i...

A special class of applications, which connects spatial database and mobile computing, requires query processing whose results depend on the geographic location of the mobile unit. Dealing with these location-dependent queries is the focus of this work. This paper presents a spatial query processing model based on location-dependent semantic cache. In addition, this paper proposes a solution fo...

Bus network design is an important problem in public transportation. A main step to this design is determining the number of required terminals and their locations. This is a special type of facility location problem, which is a time-consuming, large scale, combinatorial problem. In a previous attempt by the authors, this problem had been solved by GAMS, based on a branch and bound algorithm.&...

Fault location has been studied deeply for transmission lines due to its importance in power systems. Nowadays the problem of fault location on distribution systems is receiving special attention mainly because of the power quality regulations. In this context, this paper analyses the influence of the capacitance of cables and compensation capacitor banks when impedance-based algorithms are use...

Modeling of location information is an interesting and important topic, which influences essentially the quality of developed location-aware computer systems. In this paper the author takes a look at the means of representing spatial information. Different model types and some of their extensions are presented and compared. Then following onto the discussion on some special features of location...

Hubs are special facilities that serve as switching, transshipment and sorting points in many-to-many distribution systems. The hub location problem is concerned with locating hub facilities and allocating demand nodes to hubs in order to route the traffic between origin–destination pairs. In this paper we classify and survey network hub location models. We also include some recent trends on hu...