Leander Hörmann

Linz Center of Mechatronics GmbH · Sensors and Communication

In modern industrial applications, machines and facilities, more and more sensors are used to control and optimise the processes. To be flexible and reduce cost, wireless sensors can be used in a broad range of applications. To prevent regular battery replacement, there is the possibility to supply wireless sensors by energy harvesting. In this cha...

Monitoring the condition of components and machines enables new business opportunities in many application fields. In the field of rotating elements, such as motors, gear boxes, or bearings, sensor data can help to determine their current conditions, and thus e.g., identify the potential need for maintenance. Overheated rolling bearings may cause m...

A continually growing number of sensors is required for monitoring industrial processes and for continuous data acquisition from industrial plants and devices. The cabling of sensors represent a considerable effort and potential source of error, which can be avoided by using wireless sensor nodes. These wireless sensor nodes form a wireless sensor...

Zusammenfassung Zur Überwachung von industriellen Prozessen und zur laufenden Messdatenerfassungen von Indust-rieanlagen und-Geräten werden immer mehr und mehr Sensoren benötigt. Diese Entwicklung wird vor allem durch industrielle Internet-of-Things (IoT) Anwendungen gleichzeitig ermöglicht und voran-getrieben. Die Verkabelung stellt einen erheblic...

Wireless Sensor Networks (WSNs) are at the verge of a broad acceptance in demanding industrial applications. Nodes must fulfill key requirements like reliability and deterministic communication, but also energy autarky in order to allow maintenance-free systems. In this paper a system combining low power, robust communication with appropriate metho...

Wireless sensor networks (WSNs) are typically used to measure physical quantities of their environment at locations characterized by poor accessibility and lacking of wired infrastructure. To extend the operational time, energy harvesting systems (EHSs) support the power supply by transforming environmental energy into electrical energy. In the bes...

Cyber-physical systems often include small wireless devices to measure physical quantities or control a technical process. These devices need a self-sufficient power supply because no wired infrastructure is available. Their operational time can be enhanced by energy harvesting systems. However, the convertible power is often limited and discontinu...

Wireless sensor networks (WSNs) are typically used as interface between the real and digital world. Autonomous sensor nodes of WSNs are placed directly on location to measure physical quantities. Such locations are often characterized by a poor accessibility and no wired infrastructure. These facts cause the need of a dedicated energy supply and so...

Wireless sensor networks are often deployed in harsh environments where they are exposed to extreme conditions. The influences and faults resulting from these conditions are often overlooked. As there are many possibilities for the occurrence of faults, dependability considerations are of high importance. In this work we present an approach for cho...

Slope monitoring in inner-alpine regions is important for early warning systems to detect potential landslides. Such slopes are often located at areas without wired infrastructure. Thus, wireless sensor networks (WSNs) can be used as measurement and communication system. Each sensor node is equipped with a GPS receiver and is placed in the monitore...

Teaching wireless sensor networks (WSNs) only theoretically is not sufficient to understand the complex interaction of these networks. WSNs consist of sensor nodes which measure physical quantities of their environment, preprocess the measured data, and transmit it towards a base station in a multi-hop manner. WSNs are typically used in application...

Strong need for a sophisticated landslide monitoring and alerting system has grown especially in mountainous regions. Traditionally, monitoring is performed using time-domain reflectometry by geodesists. Since a few years the Global Positioning System (GPS) dual-frequency Real-Time Kinematic (RTK) approach is widely used for monitoring landslides....

Wireless sensor networks (WSNs) consist of wirelessly communicating nodes with an autarkic power supply for each node. Typically, the consumable energy of these nodes is very limited. Energy harvesting systems (EHSs) can be used to extend the lifetime or even enable perpetual operation of the sensor nodes. Applicable energy-aware WSN protocols and...

Wireless sensor networks (WSNs) are typically used in application areas without wired infrastructure. WSNs must be energy efficient, because they are powered by batteries or energy harvesting systems. Teaching of practical aspects of energy harvesting enhanced WSNs can be improved by integration of performance-centered tasks. This work presents an...

This contribution reports on a new European project, Remote-labs Access in Internet-based Performance-Centered Learning Environment for Curriculum Support (RIPLECS), in which an official inter-institutional European master degree program in Information and Communication System (ICS) is created. The program is conducted online across five European i...

Wireless sensor networks (WSNs) are power critical systems, because they are used in application areas without wired infrastructure. Each sensor node needs a dedicated power supply. Today's protocols and applications for WSNs are often power-aware. However, the state-of-charge (SoC) estimation of the energy storage component (e.g. rechargeable batt...

Wireless sensor networks (WSNs) suffer from the lack of wired infrastructure. Each node needs its own power supply, e.g. batteries or energy harvesting systems (EHSs). Typically, EHSs can extend the lifetime of a sensor node or even enable perpetual operation. Due to the high variation of harvestable energy of the environment, the design of the EHS...

In this work, we show how to use a leaky bucket counter (LBC) as a sophisticated threshold mechanism for detecting events in wireless sensor networks. After introducing the LBC and elaborating on various special cases for different possibilities of event detection, we present a case study. Using varying parameters, we compare the performance of the...

Wireless sensor networks (WSNs) are power critical systems, because they are used in application areas without wired infrastructure. Each sensor node needs a dedicated power supply. Today's protocols and applications for WSNs are often power-aware. However, the state-of-charge (SoC) estimation of the energy storage component (e.g. rechargeable batt...

Wireless sensor networks (WSNs) are typically used in application areas without wired infrastructure or mobility. Therefore, each sensor node needs its own energy supply unit. Sustainable WSNs are powered by energy harvesting systems (EHSs). These systems harvest and buffer the energy from the environment into rechargeable batteries or double layer...

Energy harvesting systems (EHSs) are the key to perpetual operation of electronic devices in application areas with bad infrastructure or mobility. Wireless sensor networks (WSNs) are often used in such areas. Normal WSN nodes are powered by batteries. Therefore, the lifetime is limited and the batteries have to be replaced manually after a certain...

Wireless sensor networks (WSN) continuously enhance processing capabilities and miniaturization. However, there exists a design gap to energy and bandwidth availability. Especially battery technology cannot keep pace with demands of novel versatile services. A common approach for conserving channel capacity and energy is optimizing power-aware rout...

Energy efficiency is very important for mobile devices and wireless sensor networks (WSNs), because the consumable energy is limited. Therefore, the operating time of such devices depends mainly on the capacity of the energy storage component and on the average power consumption of the device. The power consumption depends on the supply voltage and...

Large scale deployments of small, wireless, networked, embedded systems demand for cost reduction in development and maintenance. Most often, this translates into the need for reliable methods for energy conservation as it is the case for wireless sensor networks (WSNs). Our work considers energy harvesting system (EHS)enhanced WSN technology which...

Wireless sensor network (WSN) motes are resource constrained devices. Especially, bandwidth and energy are scarce resources. Therefore, lots of effort is put into the optimization of low-power networking protocols. While network control overhead is an issue for many to most of such protocols, we present an approach that is virtually overheadfree. W...

Wireless sensor network (WSN) motes are resource constrained devices. This is due to optimizations tailoring them towards application-specific and cost-efficient scenarios and setups. Many to most of these optimizations are built upon power aware aspects and dependability measures due to the fact that battery technology still evolves quite slowly a...

Wireless sensor networks (WSNs) are resource-constrained devices. Especially energy is scarce. Recent advances with energy harvesting system (EHS) technology now offer new opportunities for long-lived WSNs. Several prototypes of EHS-enhanced WSN platforms have recently been designed in a low-power and power-efficient way. While the field starts to...

Wireless sensor networks (WSNs) are resourceconstrained devices. Especially energy is scarce. Recent advances with energy harvesting system (EHS) technology now offer new opportunities for long-lived WSNs. Several prototypes of EHS-enhanced WSN platforms have recently been designed in a low-power and power-efficient way. While the field starts to m...

Wireless sensor networks (WSNs) are typically used in application areas without wired infrastructure or mobility. Therefore, each sensor node needs its own energy supply unit. Sustainable WSNs are powered by energy harvesting systems (EHSs). These systems harvest and buffer the energy from the environment into rechargeable batteries or double layer...

Wireless sensor networks (WSNs) are very com- plex systems. They are often used in application areas with poor infrastructure and mobility, so each sensor node of a WSN needs its own power supply. Energy harvesting systems (EHSs) can be used to extend the operational lifetime of sensor nodes or even enable perpetual operation. However, the efficien...

Energy efficiency is very important for wireless sensor networks (WSNs), because the consumable energy is limited. Each WSN node has its own power supply. The lifetime of the WSN node depends basically on its average power consumption. Therefore, an efficient supply of the WSN node can enhance the lifetime of it. Typically, the various components o...

Wireless sensor networks (WSNs) are very complex systems. They are often used in application areas with poor infrastructure and mobility, so each sensor node of a WSN needs its own power supply. Energy harvesting systems (EHSs) can be used to extend the operational lifetime of sensor nodes or even enable perpetual operation. However, the efficiency...

Wireless sensor network (WSN) motes are typically small and networked embedded systems. They are of limited computational power and suffer severe resource constraints - especially energy is scarce. With the advent of energy harvesting system (EHS) technology new opportunities open up for long-lived WSNs. Several prototypes of EHS-enhanced WSN platf...

Large scale deployments of small, wireless, networked, embedded systems demand for cost reduction in development and maintenance. Most often, this translates into the need for reliable methods for energy conservation as it is the case for wireless sensor networks (WSNs). Our work considers energy harvesting system (EHS)-enhanced WSN technology whic...

Wireless sensor network (WSN) motes are resource constrained devices. Especially, bandwidth and energy are scarce resources. Therefore, lots of effort is put into the optimization of low-power networking protocols. While network control overhead is an issue for many to most of such protocols, we present an approach that is virtually overhead-free....

Wireless sensor network (WSN) nodes have to cope with severe power supply constraints. Energy harvesting system (EHS) technology is used for prolonging network lifetime. Robust operation of such systems heavily relies on accurate models of EHS efficiency and node power dissipation for calculating sustainable operation modes. A node's energy balance...

A microcontroller is the most important component of a wireless sensor node, also called mote. It has to perform the measurements using the integrated peripherals, to post process the measured data as well as to coordinate the data transport of the wireless sensor network (WSN). The lowest possible power consumption is also a key requirement. The M...

A microcontroller is the most important component of a wireless sensor node, also called mote. It has to perform the measurements using the integrated peripherals, to post process the measured data as well as to coordinate the data transport of the wireless sensor network (WSN). The lowest possible power consumption is also a key requirement. The M...