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Optimization problems arise in science, engineering, economy, etc. and we need to find the best solutions for each reality. The methods used to solve these problems depend on several factors, including the amount and type of accessible information, the available algorithms for solving them, and, obviously, the intrinsic characteristics of the problem. There are many kinds of optimization problems...
Companies that are present at multiple online locations may have difficulty staffing them adequately in terms of helpdesk services with efficient use of human resources. In this paper a technological architecture is presented that allows a team of people to staff several online locations simultaneously, providing to customers/users the indication of human presence to attend them. We also present details...
The filter method is a technique for solving nonlinear programming problems. The filter algorithm has two phases in each iteration. The first one reduces a measure of infeasibility, while in the second the objective function value is reduced. In real optimization problems, usually the objective function is not differentiable or its derivatives are unknown. In these cases it becomes essential to use...
Sensor networks have been referred to as part of the background infrastructure required to achieve ubiquitous computing. This has recently promoted a considerable amount of attention from the research community that concluded that existing protocols and techniques for service discovery, such as JINI or UPnP are not suitable for the case of resource poor, battery-powered sensor nodes. We do not really...
Ad-hoc networks present new challenges due to its mobility, lack of infrastructure and resource limited devices. This means that service discovery (and usage) protocols targeted for traditional networks are not suitable for ad-hoc networks because they usually rely on the fixed and high availability characteristics of nodes to run important services. Ad-hoc networks need service discovery protocols...
Wireless Sensor networks (WSNs) have been referred to as one part of the background infrastructure required to achieve ubiquitous computing, where smart spaces are included. For instance, WSNs could be especially useful to compute the user context or even `context' of mobile resources in general. To serve this purpose, wireless sensor network must expose some sort of service discovery and usage capability...
Based on cyclic physiologic animal bioimpedance and body temperature a new method is being evaluated to predict estrus in dairy cattle with the aim of improving artificial insemination efficiency. Preceding in-vivo tests are being performed with a dedicated system based on the impedance converter AD5933, and a two-electrode configuration bioimplantable capsule. Acquired results will allow the optimal...
Organizations with a presence in the Second Lifereg world typically only provide direct user interaction with staff at specific schedules, or not at all. We present a system that provides organizations with a simple way to enable constant interaction with users of the Second Life world, by simulating staff presence using automated avatars as communication channels to real-life staff by means of instant...
Modern distributed systems are built with numerous different computing platforms, which can be based on different hardware and operating systems. In this context, the development of multi-platform device drivers may contribute for a better scalability of dynamic distributed systems. A Java-based device driver for a controller area network card was implemented, and it is intended for utilization on...
This work describes the development and implementation of a grid of self-powered multi-functional probes (MFPz) for small-scale measurements of different soil properties, as being part of a wireless sensor network. The measurement principle is based on the heat-pulse method for soil moisture and water flux measurements and in a Wenner array for soil electrical conductivity. To promote the deployment...
In the last few years, various middleware solutions have been proposed for bridging the gap between the complexity of the applications and the low hardware abstraction in order to program and manage the sensor nodes of the wireless sensor networks. The proposed middleware range from market and data- centric approaches to message oriented middleware. This survey discusses the representative state-of-the-...
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