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Activity-Based Congestion Management (ABC)

Congestion occurs in packet-based communication networks when more traffic temporarily enters a network than can be forwarded. Congestion management detects congestion in a communication network and drops or marks packets to mitigate congestion. Still, a few heavy users can monopolize the bandwidth of a bottleneck link, e.g., by opening many flows or using non-responsive transport protocols to send at large data rate. A challenge is to drop or mark the right packets if fair capacity sharing and low delay are desired in a network. We propose activity-based congestion management (ABC), with which users can share a network’s capacity fairly within an ABC domain while keeping packet delays low. To that end, activity meters and markers equip user traffic with activity information that reflects a user’s traffic rate. In case of congestion, traffic with high activity is preferentially dropped on bottleneck links. Thereby, users can achieve a fair share of the network’s transmission capacity. Low delay is achieved by leveraging active queue management (AQM) in routers or switches that start dropping traffic in case of congestion to avoid extensive, permanent packet queueing. ABC-AQM is a modification of a normal AQM that increases drop probabilities for high-activity traffic and decreases them for low-activity traffic. The mechanism is easily adaptable to various AQMs. 01.07.2016 | nachricht Read more

BaBeDa - Battery-free acceleration data logger

BaBeDa is a passive energy self-sufficient data logger for detection and documentation of shock events. A piezoelectric element is used as an acceleration sensor, since it - depending on the magnitude of the acceleration - produces electrical signals during a shock. These electrical signals are used both as a measurement signal and as power source for the circuit, which stores the data concerning the shock event. BaBeDa can be used in particular for shock detection in shipping. In the packing stations and logistics centers each BaBeDa chip can be read out to determine whether a packet was transported properly or not. For this purpose BaBeDa can already be integrated into a packing during its production. Multiple usage is possible. Since BaBeDa is energy self-sufficient, there are no restrictions on the use of time. Because of the simple technique BaBeDa is compact, suitable for mass production and therefore also very cost effective. A German patent application has been filed at the DPMA. On behalf of the University of Applied Sciences Bielefeld, we offer the opportunity of licensing and further development of the technology to interested companies. 29.06.2016 | nachricht Read more

Battery electrodes made of silicon layers with optimized porosity and microstructure

The use of silicon as anode material promises high theoretical energy density in lithium-ion batteries. However, the volume of a silicon-based anode may increase substantially during lithiation. In order to solve this problem, scientists at the Institute of Photovoltaics (ipv), University of Stuttgart, now succeeded in developing a method for producing micro-stabilized and porous silicon anodes by means of laser irradiation. The battery electrodes related to this invention offer a high potential for lithiation and at the same time improved mechanical stability. Due to a large active surface they provide high energy density. They can be used for the production of mechanically flexible batteries. 23.06.2016 | nachricht Read more

Light weight thermal-insulator material with robust compressive load and flame retardant properties

Scientists of the University of Duisburg-Essen developed in cooperation with the German Aerospace Center (DLR) a full inorganic insulation material with high performance qualities. The material exhibits extraordinary heat-insulating and load-carrying properties. It combines the benefits of conventional inorganic building material like compressive strength and the ability to be poured into all kind of durable moulds with the advantage of being heat-insulating. The latter makes it perfect with regards to energy saving aspects. The designated properties are dependent on the ratio of matrix-to insulation-material. It’s very low weight in combination with its compression strength and its flame-retardant properties makes it a potential construction material even for applications with high demands. The superlight and superinsulating material could be used in cars, trains and any other kind of vehicles. Even aerospace applications are imaginable. By its heat resistance, the material enables the passive isolation of load bearing areas in buildings as well as passive insulation in areas where high temperatures occur like exhaust systems or furnaces. In addition, the material isolates not only thermally but also acoustically. High efficient heat pumps, new kinds of filters for clean air inside cars, trains and airplanes are just some examples of applications. 22.06.2016 | nachricht Read more

Time dynamic 3D data visualisation

The invention presented here relates to a procedure and device for the identification of borderlines of hypersurfaces from data matrices. 22.06.2016 | nachricht Read more

Intelligent glass ? smart windows

The innovation comprises a thin film system for glass, which regulates the warmth in a room without external control, within an invisible switching process. 16.06.2016 | nachricht Read more

Guaranteeing operational safety in power grids

Due to the fluctuating power production and periods of peak demand, node potentials and line currents in the power grid can reach critical values which may be inacceptable for grid infrastructure. The proposed hierarchical model- based predictive control proposes optimal consumption constraints to consumers at critical times in order to secure reliability and safety of the power grid. 13.06.2016 | nachricht Read more

Improved ex-vivo expansion of immune cells for use in cell therapy

<b>Abstract</b> Researchers from Goethe University Frankfurt am Main developed a new method to increase proliferation and viability of immune cells, e.g. natural killer (NK) cells, derived from patients or donors. The obtained NK cell preparations are currently tested preclinically for treatment of leukemia. 07.06.2016 | nachricht Read more

Pillow Plate-Heat Exchanger - With optimized flow configuration for increased efficiency

Currently, pillow-plate heat exchangers (PPHE) enjoy growing attention and become increasingly employed in various branches of industry. The ongoing expansion of the PPHE exploitation area generates a need for new structural requirements for this type of equipment. In this regard, the flow configuration in PPHE is crucial for key aspects like energy efficiency, operating costs and functionality. Whereas in conventional PPHE the flow can be redirected by baffles made of welding lines in the inner pillow-plate channels, there is no method to improve the flow configuration in the outer channels. For this reason, a new PPHE was developed in the group of Professor Kenig at the University of Paderborn, which enables the flow redirection also in the outer channels. A German patent application is pending, international applications are possible. On behalf of the University of Paderborn, PROvendis offer licenses to interested companies. 03.06.2016 | nachricht Read more

Optical Diode

Sensitive optical components such as semi-conductor laser diodes must be protected from back reflection. A conventional solution to this problem are Faraday optical diodes, which suffer verious problems. We offer a novel, performant optical diode exploiting spin-orbit coupling of light. 02.06.2016 | nachricht Read more
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Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Mainz-based physicists find missing link between glass formation and crystallization

Densified regions with drastically reduced internal motion either act as crystal precursors or cluster and frustrate all further dynamics

Glasses are neither fluids nor crystals. They are amorphous solids and one of the big puzzles in condensed matter physics. For decades, the question of how...

Im Focus: Thousands on one chip: New Method to study Proteins

Since the completion of the human genome an important goal has been to elucidate the function of the now known proteins: a new molecular method enables the investigation of the function for thousands of proteins in parallel. Applying this new method, an international team of researchers with leading participation of the Technical University of Munich (TUM) was able to identify hundreds of previously unknown interactions among proteins.

The human genome and those of most common crops have been decoded for many years. Soon it will be possible to sequence your personal genome for less than 1000...

Im Focus: Optical lenses, hardly larger than a human hair

3D printing enables the smalles complex micro-objectives

3D printing revolutionized the manufacturing of complex shapes in the last few years. Using additive depositing of materials, where individual dots or lines...

Im Focus: Flexible OLED applications arrive

R2D2, a joint project to analyze and development high-TRL processes and technologies for manufacture of flexible organic light-emitting diodes (OLEDs) funded by the German Federal Ministry of Education and Research (BMBF) has been successfully completed.

In contrast to point light sources like LEDs made of inorganic semiconductor crystals, organic light-emitting diodes (OLEDs) are light-emitting surfaces. Their...

Im Focus: Unexpected flexibility found in odorant molecules

High resolution rotational spectroscopy reveals an unprecedented number of conformations of an odorant molecule – a new world record!

In a recent publication in the journal Physical Chemistry Chemical Physics, researchers from the Max Planck Institute for the Structure and Dynamics of Matter...

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