85 research outputs found
janbrumm/inbodychannel: Version v1.0.0
No full text<p>The provided data contains the modeling parameters and a Python script to generate random transfer functions for ultra wideband in-body communication as described in</p>
<p>[BSB19] J.-C. Brumm, H. Strohm and G. Bauch, “A Stochastic Channel Model for UWB In-Body Communication,” in <em>41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC'2019)</em>. Berlin, Germany, 2019.</p>
<p>The software can also be found in our GitLab repository https://collaborating.tuhh.de/int/in-body/inbodychannel.</p>
Modeling Parameters from the Paper "A Stochastic Channel Model for Ultra Wideband In-Body Communication"
No full textThe provided data contains the modeling parameters and a Python script to generate random transfer functions for ultra wideband in-body communication as described in
[BSB19] J.-C. Brumm, H. Strohm and G. Bauch, “A Stochastic Channel Model for UWB In-Body Communication,” in 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC'2019). Berlin, Germany, 2019.
More information can be found in our GitLab repository https://collaborating.tuhh.de/int/in-body/inbodychannel.
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Oxygen demand of bean bruchids (Acanthoscelides obtectus Say)
No full textThe common bean (Phaseolus vulgaris L) is an important crop in many countries and its safe storage is crucial in maintaining a sufficient and high quality food supply for the community. A non-chemical storage technique, hermetic storage, is being used to control the bean bruchid (Acanthoscelides obtectus Say), a beetle which can cause large losses to stored beans. Experiments were carried out using hermetically sealed containers of known gas volume at different temperatures (10 and 27°C) and bean moistures (8 and 16% wet basis) to quantify the oxygen requirement of bruchids. Bruchids use between 0.0074 and 0.1043 cm3 bruchid-1day-1, depending on bean temperature and bean moisture content. Days to 100% adult bruchid mortality in hermetic storage, as a function of infestation level, storage volume, temperature and bean moisture content, can be estimated by using these oxygen requirement results. These estimates can be used to design hermetic storage systems to protect beans from damage by bruchids.This article is published as Jeffrey, Askey, Bern Carl, Brumm Thomas, and Coats Joel. "Oxygen demand of bean bruchids (Acanthoscelides obtectus Say)." Journal of Stored Products and Postharvest Research 11, no. 2 (2020): 8-14. doi: http://www.academicjournals.org/JSPPR. Copyright ©2020 Author(s). This is an open access article under the terms of the Creative Commons Attribution. http://creativecommons.org/licenses/by/4.0/deed.en_US
Hermetic storage of maize grain in repurposed food oil containers to control maize weevils
No full textInsect-related grain loss is a significant problem in Uganda and other countries in sub Saharan Africa. The maize weevil (Sitophilus zeamais Motschulsky) is one of the major insect pests that infests stored maize grain (Zea mays Linneaus). This study demonstrates the feasibility of hermetic or “air-tight” storage for protecting maize from maize weevil damage using low-cost repurposed food oil containers. Maize infested with weevils was obtained from a local market in Kamuli, Uganda. Quality characteristics determined before storage included live weevil numbers, moisture content, and kernel damage. Storage treatments, each done in triplicate in 10-L containers, included (1) hermetically sealed and (2) non-hermetically sealed maize grain. After 30 days of storage, 100% mortality of maize weevils was achieved in treatment (1), while the number of weevils increased by nearly a factor of three in treatment (2). Although, there were no significant differences between treatments in final moisture content, test weight, and damage, broken corn and foreign material was significantly higher in treatment (2) versus (1). This 30-day study using an experimental design with up to three replicated treatments demonstrated that repurposed food oil containers can be effectively used for hermetic storage of maize.This article is published as Brumm, Thomas J., Carl J. Bern, and David F. Webber. "Hermetic storage of maize grain in repurposed food oil containers to control maize weevils." Journal of Stored Products and Postharvest Research 12, no. 2 (2021): 42-46. doi: http://www.academicjournals.org/JSPPR. Copyright ©2021 Author(s). This is an open access article under the terms of the Creative Commons Attribution. http://creativecommons.org/licenses/by/4.0/deed.en_US
FIRE-MAKING USING A STONE `STRIKE-A-LIGHT' IN THE SOA BASIN OF FLORES, INDONESIA
No full textDuring recent archaeological fieldwork on the island of Flores in eastern Indonesia, the author observed a firemaking technique involving the use of a stone `strike-alight' (see Skertchly 1879). The strike-a-light used was a chalcedony flake scavenged from a prehistoric site; hence the fire-making technique has archaeological and in particular, taphonomic, significance
On the placement of on-body antennas for ultra wideband capsule endoscopy
No full textUltra wideband communication is proposed as an alternative to increase the data rate for in-body to on-body communication compared with existing narrowband standards. However, up to now, it is unknown, which maximum data rates can be achieved in this environment. The channel capacity is a theoretic tool that allows quantifying this limit. In a frequency-dependent environment like the human body, it is necessary to know the frequency dependence of the communication channel to calculate the channel capacity. As there are no reproducible models available in literature that enable the calculation of the channel capacity, we propose a new channel modeling technique based on a plane wave propagating through a multi-layered dielectric. From this simplified model, the frequency-dependent path loss for various in- and on-body locations can be calculated analytically. Thus, the channel capacity can be determined. In addition, this approach offers the possibility to determine the optimum position of multiple receive antennas on the abdominal surface. Results show that a single receive antenna gives nearly no improvement compared to existing standards. However, if the number of antennas is increased to 5, the 10%-outage capacity can be improved by several orders of magnitude.Deutsche Forschungsgemeinschaft (DFG
On the shadowing distribution for ultra wideband in-body communication path loss modeling
No full textCurrent path loss models for ultra wideband inbody communication are usually based on finite-difference timedomain simulations. Due to the computational complexity they include only a limited number of transmitter-receiver pairs. We propose a new channel modeling approach based on a plane wave propagating through a multi-layered dielectric. With this approach it is possible to calculate the path loss of many more transmitter-receiver pairs. Hence, the statistical distribution of the path loss can be evaluated better. Our results show that the standard deviation of the path loss increases in fact drastically with distance between transmitter and receiver. For distances of more than 100mm it gets much larger than the standard deviation proposed in literature. That means the variation in path loss might in reality be much higher than current models indicate
Channel modeling and performance analysis of ultra wideband in-body communication
No full textWireless capsule endoscopes are a proven method for the diagnosis of gastrointestinal diseases. In this thesis, ultra wideband communication is investigated as an alternative to common narrowband transmission to increase the video quality. A reproducible and flexible channel model for ultra wideband in-body communication is derived. Based on this, fundamental limits for the communication performance are investigated by computing the channel capacity. The influence of different human body models, the receive antenna placement, and the dielectric properties of human tissue on the channel capacity are analyzed. Furthermore, an exemplary ultra wideband communication system is designed and its bit error probability is evaluated.Drahtlose Kapselendoskopie ist ein erprobtes Verfahren für die Diagnose von Darmerkrankungen. In dieser Arbeit wird die Verwendung von Ultrabreitband Kommunikation anstatt herkömmlicher Schmalband-Übertragung untersucht, um die Video-Qualität zu erhöhen. Dazu wird ein reproduzierbares und flexibles Kanalmodell entwickelt. Dieses Modell wird genutzt um fundamentale Grenzen für die Datenübertragung mit Hilfe der Kanalkapzität zu untersuchen. Dabei wird der Einfluss des Körperbaus, der Platzierung der Empfangsantennen, sowie der dielektrischen Eigenschaften des Gewebes auf die Kanalkapazität analysiert. Außerdem wird ein beispielhaftes Übertragungsverfahren entworfen und seine Bitfehlerwahrscheinlichkeit evaluiert
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