Papers by Karlheinz Kellner
Online Monitoring of Posture for Preventive Medicine Using Low-Cost Inertial Sensors
People in many professions suffer from low back pain (LBP) due to wrong movements. Although this ... more People in many professions suffer from low back pain (LBP) due to wrong movements. Although this is anticipated by occupational medicine, the quality of evidence is low, since little objective measurements about the spine position in daily-use exist. The paper presents an ultra-flat posture monitoring system based on low-cost acceleration sensors, which can be very efficiently be used to measure the posture of the spine. First experiments (lab-based and in daily-use) showed a deviation of approximately 1° with a low standard deviation. Innovation is the suitability for daily-use by sensors having a height of 2,5 mm that allow a seamless usage even during positions applying pressure to the back such a leaned sitting on a chair.
Electronics
Powerline communication (PLC) is a versatile method that uses existing infrastructure such as pow... more Powerline communication (PLC) is a versatile method that uses existing infrastructure such as power cables for data transmission. This makes PLC an alternative and cost-effective technology for the transmission of sensor and actuator data by making dual use of the power line and avoiding the need for other communication solutions; such as wireless radio frequency communication. A PLC modem using DSSS (direct sequence spread spectrum) for reliable LIN-bus based data transmission has been developed for automotive applications. Due to the almost complete system implementation in a low power microcontroller; the component cost could be radically reduced which is a necessary requirement for automotive applications. For performance evaluation the DSSS modem was compared to two commercial PLC systems. The DSSS and one of the commercial PLC systems were designed as a direct conversion receiver; the other commercial module uses a superheterodyne architecture. The performance of the systems w...
8-hydroxyquinoline-glucuronide Sodium Salt Used as Electroactive Substrate for a Sensitive Voltammetric Detection of Escherichia Coli in Water Samples
Procedia Engineering
A Fluorescence Based Sensor System for Automated Detection of E. Coli in Water
Procedia Engineering
An automated, Robotic Biosensor for the Electrochemical Detection of E. Coli in Water
Procedia Engineering
Proceedings
Self-Mixing (SM) is a promising technique for sensing vibration, distance, velocity etc. To retri... more Self-Mixing (SM) is a promising technique for sensing vibration, distance, velocity etc. To retrieve accurate metric measurements from an acquired SM signal, it is necessary to correctly detect all interferometric fringes. Traditionally, SM fringes are detected by a derivative based threshold (DBT) scheme. However, such a scheme gives correct results only for SM signals with high signalto-noise ratio (SNR) and moderate optical feedback regime. So, in this paper, a better fringe detection method, based on Matched Filter (MF), is proposed which has provided correct SM fringe detection even in case of low SNR and weak optical feedback regime. The proposed approach has resulted in fringe detection accuracy of 100% for a low SNR SM signal belonging to the weak feedback regime.
Spread Spectrum based RFID Position Estimation for Sensor Applications
Procedia Engineering, 2016
A prediction and simulation model for target-oriented regional citrate-calcium anticoagulation in extracorporeal blood purification
The International journal of artificial organs, Jan 29, 2016
Regional citrate-calcium anticoagulation is becoming more and more attractive for extracorporeal ... more Regional citrate-calcium anticoagulation is becoming more and more attractive for extracorporeal treatments in the clinical routine. A prediction and simulation tool for the safe application of RCA during extracorporeal treatments was introduced. The model predicts the course of the ionized calcium level in the patient and the current anticoagulation status in the extracorporeal circuit based on the actual settings of the dialysis machine. The simulation tool delivers areas in which the blood and dialysate flow can be adjusted to reach the desired target values for RCA and predicts the time course of several parameters during treatment.
Development of an Automated Biosensor for Rapid Detection and Quantification of E. coli in Water
Procedia Engineering, 2015
A New, Low-cost Potentiostat for Environmental Measurements with an Easy-to-use PC Interface
Procedia Engineering, 2015
Evaluation of Adaptive Interference Cancellation in Chirp Spread Spectrum-based Communication Systems
An Integrated Optical Measurement System for Water Quality Monitoring
Procedia Engineering, 2014
ABSTRACT The Spectral Absorption Coefficient (SAC) is an easy detectable sum parameter, giving in... more ABSTRACT The Spectral Absorption Coefficient (SAC) is an easy detectable sum parameter, giving information about the organic load in wastewater. The SAC 254 measurement is done at 254 nm, implying parameters like COD (chemical oxygen demand), BOD (biochemical oxygen demand) and TOC (total organic carbon).
Position Estimation of RFID Based Sensors Using Passive SAW Compressive Receivers
Procedia Engineering, 2014
ABSTRACT Localization of RFID devices are important tasks in numerous modern applications. The co... more ABSTRACT Localization of RFID devices are important tasks in numerous modern applications. The communication distance and therefore the ranging distance between base station and RFID sensor-tags is strongly limited by the maximum transmission power and the receiver sensitivity. A method based on passive SAW compressive receivers is presented to enhance the transmission distance for RFID tag ranging. The position estimation was done by active transmission of chirp pulses by the RFID sensor-tag and ToA and PoA measurements at the receivers.
Low-Cost Wireless Transponder System for Industrial and Biomedical Applications
2005 5th International Conference on Information Communications & Signal Processing, 2005
ABSTRACT
International Journal of Wireless Networks and Broadband Technologies, 2011
Wireless Sensor Networks (WSNs) are becoming more important in the medical and environmental fiel... more Wireless Sensor Networks (WSNs) are becoming more important in the medical and environmental field. The authors propose an on-demand routing protocol using sensor attractiveness-metric (Pa) gradients for data forwarding decisions within the network. Attractiveness-based routing provides an efficient concept for data-centric routing in wireless sensor networks. The protocol works on-demand, is source-initiated, has a flat hierarchy and has its origin in the idea of pheromone-based routing. The algorithm supports node-to-sink data traffic and is therefore a lightweight approach to generalized multihop routing algorithms in WSNs. The performance evaluation of the proposed protocol is done by extensive simulation using a multi-agent based simulation environment called NetLogo. The efficiency of the attractiveness-based routing algorithm is compared in simulations with the well known Dynamic Source Routing algorithm (DSR). The authors conclude that the Pabased routing algorithm is well s...
Wireless sensor networks have been a big promise during the last few years, but a lack of real ap... more Wireless sensor networks have been a big promise during the last few years, but a lack of real applications makes difficult the establishment of this technology. In this paper a real monitoring application in an instant coffee factory is presented. This application belongs to the group of environmental solutions based on wireless sensor networks, and it is focused on the impact of the instant coffee production processes in one of the largest instant coffee factories in Europe. The paper includes the entire application scenario, from the hardware of the WSN nodes to the software that will evaluate the impact and will close the loop.
Sensors and Actuators B: Chemical, 2013
Extracorporeal blood purification systems based on specific micro-adsorbents can be used for sele... more Extracorporeal blood purification systems based on specific micro-adsorbents can be used for selective elimination of toxic substances from the patient. A suspension of blood plasma with micro-adsorbents is recirculated in the extracorporeal detoxification circuit. A safety system detecting erythrocyte damage by hemoglobin release as well as measuring the bilirubin elimination rate in the adsorbent circuit was developed. The sensor principle is based on broadband illumination and reflectivity measurement in the tubing where the adsorbent-plasma suspension is recirculated. From the specific reflection spectrum the hemoglobin and bilirubin content is calculated. Further, the effects of cross-sensitivity of hemoglobin and bilirubin on the detection accuracy are studied.
An efficient source initiated on-demand data forwarding scheme for wireless sensor networks
International Conference on Information, Communications and Signal Processing, 2009
A novel approach for an on demand routing protocol using sensor attractiveness-metric (Pa) gradie... more A novel approach for an on demand routing protocol using sensor attractiveness-metric (Pa) gradients for the data forwarding decisions is proposed. Attractiveness based routing provides an efficient concept for a data-centric routing in wireless sensor networks. The protocol works on-demand, is source-initiated, has a flat hierarchy and has its origin in the idea of pheromone based routing. During development of
Simulation and Implementation of an Attractiveness based On-Demand Routing Algorithm for Wireless Sensor Networks
Procedia Engineering, 2012
ABSTRACT A sensor network with an on-demand data centric routing strategy is presented. The routi... more ABSTRACT A sensor network with an on-demand data centric routing strategy is presented. The routing between the sensor nodes and the data sink(s) (base station/s) is based on attractiveness-metric (P-a) gradients for the data forwarding decisions within the network. The performance of P-a based routing was simulated by the multi-agent simulation tool NetLogo and compared with the popular and widely used Dynamic Source Routing (DSR) algorithm. Additionally, to test the long term stability and the performance of the P-a based routing algorithm, several sensor nodes for local temperature and humidity measurement were placed in wine yards to monitor the risk of downy mildew infection. (C) 2012 Elsevier Ltd....Selection and/or peer-review under responsibility of the Symposium Cracoviense Sp. z.o.o.
Uploads
Papers by Karlheinz Kellner