Cristian Duran-Faundez

University of Bío-Bío | UBB · Department of Electrical and Electronics Engineering

Nowadays, people can access a wide range of applications and services for mobile device users. Among them, location-based services (LBS), where the application needs the user’s position to provide the service. Some examples of these applications are Uber and Waze. Nevertheless, the repetitive use of an LBS can reveal confidential user information;...

This paper proposes an internet of things application with intelligent data processing, which can be applied in several industrial sectors. The designed application allows the data collection, storage and visualisation. An IoT gateway is implemented on a Raspberry Pi and functions as a local server. The IoT gateway allows access to the information...

Large cities are increasingly investing in efficient mobility and sustainable transportation as an alternative to expensive and pollutant traditional vehicles. In parallel, people are also seeking cleaner and healthier options for short and last-mile distances. In order to cope with this trend, which has boosted the adoption of bikes in urban areas...

In some important berry-producing countries, such as Chile, the fruit is harvested manually. The markets for these products are generally very distant, and any damage caused to the fruit during harvesting will be expressed in its shelf life. The first step to understanding the harvesting process is to identify what happens to the harvest baskets in...

With the increasing availability of affordable open-source embedded hardware platforms, the development of low-cost programmable devices for uncountable tasks has accelerated in recent years. In this sense, the large development community that is being created around popular platforms is also contributing to the construction of Internet of Things a...

In the present work, a control system based in Networked Control Systems is proposed, in order to provide a suitable solution to the vehicle following problem. This problem presents the two main obstacles: the first been the difficulty in the identification process (leading to uncertain numerical models) and the second one is the data communication...

This paper proposes a new communication protocol for output-feedback control through multi-hop Wireless Sensor Network (WSN). The protocol is based on a Hop-by-Hop transport scheme and is especially devised to simultaneously fulfill two conflicting criteria: the network energy consumption and the stability/performance (in terms of H ∞ norm) of the...

Location-based services (LBSs) assume that users are willing to release trustworthy and useful details about their whereabouts. However, many location privacy concerns have arisen. For location privacy protection, several algorithms build a cloaking region to hide a user’s location. However, many applications may not operate adequately on cloaked l...

Modern cities are subject to periodic or unexpected critical events, which may bring economic losses or even put people in danger. When some monitoring systems based on wireless sensor networks are deployed, sensing and transmission configurations of sensor nodes may be adjusted exploiting the relevance of the considered events, but efficient detec...

In this paper, we propose a control model based on NCS theory to solve the vehicle-following problem, which presents both issues: the difficulty in the identification process and a lossy network. To deal with network losses, we use a mode dependent Markov jump linear filter coupled with a statefeedback controller. To handle parameter uncertainty, a...

Wireless technologies have attracted the attention of the industrial sector, due to their multiple advantages such as ease of installation, flexibility and mobility. However, the application of wireless in industry is most limited to non-critical sensing applications, making the communication of critical instruments and control systems almost exclu...

We work on the optimization of high complexity networked systems. In this work we discuss three high complexity problems we have engaged in different projects: the first one is related to optimal interleaving of images for image communication, which can be used to enhance error robustness in unreliable networks, the second one is about optimal depl...

Image interleaving has proven to be an effective solution to provide the robustness of image communication systems when resource limitations make reliable protocols unsuitable (e.g., in wireless camera sensor networks); however, the search for optimal interleaving patterns is scarcely tackled in the literature. In 2008, Rombaut et al. presented an...

Wireless camera sensor networks have been employed for different types of visual monitoring applications, promoting innovative services for Internet of Things scenarios and smart cities. In this context, in order to better support the validation procedures of visual sensor networks, we implement various simulation cases aimed at resource consumptio...

The advance of technologies in several areas has allowed the development of smart city applications, which can improve the way of life in modern cities. When employing visual sensors in that scenario, still images and video streams may be retrieved from monitored areas, potentially providing valuable data for many applications. Actually, visual sen...

For many visual monitoring scenarios, it may be desired to accurately compute the segment of an object's perimeter that is being viewed by a particular camera, e.g. supporting applications for pattern recognition systems and coverage optimization. As objects may have different formats, generic polygon-based approaches may bring inaccurate results,...

Availability in wireless visual sensor networks is a major design issue that is directly related to applications monitoring quality. For targets monitoring, visual sensors may be deployed to cover most or all of targets, and monitoring quality may be focused on how well a set of targets are being covered. However, targets may have different dimensi...

In wireless visual sensor networks comprised of multiple camera-enabled sensors, source prioritization can be exploited to soften the impact of congestion, packet loss and energy depletion when higher relevant packets are processed. However, for such optimizations, source nodes have to be properly prioritized according to some effective metric. Whe...

Distributed approaches for controlling Flexible Manufacturing Systems (FMS) need specific tools and protocols to achieve global system's objectives. Object-Oriented (OO) and Agent-Oriented (AO) approaches have been adopted to implement FMS control as a heterarchy. In this paper, we present our last efforts in modeling and implementing FMS in distri...

In this article, we present the development of a simple multiagent-based system for the control of a flexible manufacturing system. We followed the stages of a methodology specially conceived for the development of agent-based system, which is an integration of the classical methodology for agent-oriented analysis and design Gaia, and AUML (Agent-U...

In this paper, we study the impact on a dynamical system and the network when using semi reliable communication in a control scheme in a Multi-hop network with the Hop by Hop transport scheme. Specifically, we propose a trade-off between the global number of transmissions and the H∞ norm by limiting the maximum number of retransmission per package....

Poster presented at the congress SBAI 2015: In this paper, we study the impact on a dynamical system and the network when using semi reliable communication in a control scheme in a Multi-hop network with the Hop by Hop transport scheme. Specifically, we propose a trade-off between the global number of transmissions and the H ∞ norm by limiting th...

In this paper, we design and evaluate a control system which, by using as input RSSI measures, allows anticipatory movements of robotic arms decreasing idle times at the CIMUBB Laboratory. Classical Log-Normal model, which relates the strength of a signal received by a node with the distance at which the sender of the signal is, was adopted. The hi...

Colloque avec actes et comité de lecture. internationale.

We study block interleaving techniques for enhancing robustness against packet loss on wireless vision sensor networks. We evaluate three techniques: DSJ-AL interleaving, Turner and Peterson (TP) technique, and Torus Automorphisms (TA). Results in terms of image quality, obtained trough extensive simulations over monochromatic images, show the impr...

In the context of multi-robot exploring, we work on the particular problem of maintaining communication links between an explorer robots and a base station using autonomous robot routers. In this paper, we propose and describe a kind of exploring application which considers a variable amount of robots over time. This problem opens various research...

In the context of multi-robot exploring, we work on the particular problem of maintaining communication links between an explorer robots and a base station using autonomous robot routers. In this paper, we propose and describe a kind of exploring application which considers a variable amount of robots over time. This problem opens various research...

In this paper we present Sim-LIT, a framework for the simulation of packet loss effects on the quality of non-coded or coded still images transported over wireless sensor networks. The tool is focused on image quality assessment and it can be used to evaluate error resilience during image communications. In this first version the evaluation of bloc...

This article presents a lightweight image compression algorithm explicitly designed for resource-constrained wireless camera sensors, called TiBS (tiny block-size image coding). TiBS operates on blocks of 2×2 pixels (this makes it easy for the end-user to conceal missing blocks due to packet losses) and is based on pixel removal. Furthermore, TiBS...

This paper presents Se˜ nor Maderita, a wheeled semi-omnidirectional steering robot for training, development and research applications. It was conceived as a modular proto- type consisting on two main parts: a module for mobilization and other for processing and sensing. The robot has 4 independently steerable wheels with eight servo motors (2 for...

The incorporation of autonomous wireless devices in monitoring and control supporting in industrial systems is an emerging issue which opens a wide spectrum of possibilities. Intelligent flexible manufacturing systems might require a knowledge of the time a pallet or any other approaching transport unit needs to get a flexible manufacturing cell (F...

Among the many potential applications of wireless sensor networks (WSNs), those using image sensors are valuable for object detection, recognition, localization, counting, and tracking. Small and low-power image sensors already exist but special challenges for energy-efficient, low-complexity image processing and communication in WSN must be addres...

Parmi les nombreuses applications potentielles des réseaux de capteurs sans fil, celles utilisant des capteurs d'image sont appréciables pour tout ce qui concerne la détection, la reconnaissance et la localisation d'objets par la vision. Des capteurs de petite taille, peu gourmands en énergie et dotés d'une caméra existent déjà au stade de prototyp...

New applications of wireless sensor networks require vision capabilities. Considering the high loss rates found in sensor networks, and the limited hardware resources of current sensor nodes, low-complexity robust image transmission must be implemented, avoiding as much as possible the need for retransmission or redundancy. In this paper we propose...

In this paper, we propose two image transmission schemes driven by energy efficiency considerations in order to be suitable for wireless sensor networks. The first one is an open-loop image transmission scheme while the second one is closed-loop. Both schemes are based on wavelet image transform and semi-reliable transmission to achieve energy cons...

We propose a self-adaptive image transmission scheme driven by energy efficiency considerations in order to be suitable for wireless sensor networks. It is based on wavelet image transform and semireliable transmission to achieve energy conservation. Wavelet image transform provides data decomposition in multiple levels of resolution, so the image...

This paper proposes and evaluates a simple energy-aware image transmission protocol suitable for wireless sensor networks. Energy savings is achieved through the use of a wavelet image transform and a semi-reliable transmission. Wavelet image transform provides data decomposition in multiple levels of resolution, so the image can be divided into pa...

Parmi les nombreuses applications potentielles des réseaux de capteurs sans fil, celles utilisant des capteurs d'image sont appréciables pour tout ce qui concerne la détection, la reconnaissance et la localisation d'objets par la vision. Des capteurs de petite taille, peu gourmands en énergie et dotés d'une caméra existent déjà au stade de prototyp...