Manuel Lösch (M.Sc.)
Manuel Lösch studierte Informatik und Wirtschaftsinformatik. Den Master erwarb er an der Universität Mannheim, wo er Wirtschaftsinformatik mit Spezialisierung "Systemdesign und -entwicklung" studierte. Seinen Bachelor in Informatik erhielt er von der Hochschule Furtwangen, an der er als jahrgangsbester Absolvent abschloss. Während seines Studiums studierte er für je ein Semester in den USA sowie in der Republik China und sammelte Praxiserfahrung im Bereich der Softwareentwicklung bei der IBM Research & Development GmbH. Seine Bachelor- sowie Masterarbeit schrieb er in Zusammenarbeit mit SAP Research. Erstere beschäftigt sich mit Fahrzeugkommunikation über Mobilfunknetze und zweitere bewegt sich im Bereich von Servicegarantien für Cloud Computing.
Seit 2013 ist Manuel Lösch als wissenschaftlicher Mitarbeiter am FZI tätig. Dort arbeitet er als Informatiker an Softwarelösungen und Algorithmen für das Energiesystem der Zukunft.
Zeitungs- oder Zeitschriftenartikel (2)
- Locations for Performance Ensuring Admission Control in Load Balanced Multi-Tenant SystemsInfoDetails
Manuel Loesch, Rouven Krebs, 2014
In the context of Software as a Service offerings, multi-tenant applications (MTAs) allow to increase the efficiency by sharing one application instance among several customers. Due to the tight coupling and sharing of resources on all layers up to the application layer, customers may influence each other with regards to the performance they observe. Existing research on performance isolation of MTAs focuses on methods and concrete algorithms. In this paper, we present concerns that are raised when serving a high amount of users in a load balancing cluster with multiple MTA instances. We identified potential positions in such an architecture where performance isolation can be enforced based on request admission control. Considering various approaches for request-to-instance allocation, our discussion shows that different positions come along with specific pros and cons that have influence on the ability to performance-isolate tenants.
- Vehicle-to-Business Communication: Enabling Web Services for High-Scalable Communication Infrastructures in Mobile Bandwidth-Limited NetworksInfoDetails
Manuel Loesch, Markus Miche, Friedbert Kaspar, Marc Brogle, Thomas Michael Bohnert, 2010
This paper shows how we realized a prototypical platform for interconnecting vehicles and business systems based on mobile cellular networks and Web service standards. However, Web services have been originally designed for broadband networks like the conventional, non-mobile Internet. Because of the incomplete coverage of 3G cellular networks, especially the bandwidth limitation of 2G cellular networks has to be seen as bottleneck. Thus, we surveyed different approaches for improving the SOAP layer in order to achieve efficient and scalable Web service communication. The impact of compression and usage of binary XML on the message size, transmission time, and scalability is evaluated based on realistic application scenarios and various bandwidth classes. We come to the conclusion that existing technologies can be used to achieve significant improvements in bandwidth-limited networks. However, we further show that such a SOAP layer optimization does not come along with noticeable benefits in broadband networks.
- Qualitätssicherung in der Hochschullehre mit dem Inverted-Classroom-Ansatz. Selbst-Assessment als formatives Prüfungsverfahren und Evaluationsinstrument am Beispiel des Projekts MoQiKInfoDetails
Irina Fuchs, Manuel Lösch, Ingo Mauser, Roland Küstermann, Dietmar Ratz, 2016
Usually, formative self-assessments help to control the students' learning progress in inverted classroom model-based lectures at universities. This article elucidates how self-assessments may also be used evaluatively as an integrative component of quality-improving measures in university apprenticeship. The evaluation results help to adapt and improve the teaching contents – lecture material and videos – during the course as shown by the example of the 'Introduction to Web Programming' which is part of the Business Information Technology studies at the Baden-Wuerttemberg Cooperative State University in Karlsruhe.
- Simulation Study of a Heuristic Predictive Optimization Scheme for Grid-reactive Heat Pump OperationInfoDetails
Tillman Fassnacht, Manuel Loesch, Andreas Wagner, 2015
A heuristic predictive optimization scheme for grid-reactive heat pump operation is introduced in this paper. It is based on thermal demand predictions (domestic hot water, heating demand) and does not require any numerical optimization which makes it easy to implement on real hardware. It follows the idea to use the heat pump to overheat the existing hot water storage in times of cheap electrical energy (oversupply). This way, converting electrical into thermal energy allows to economically shift electrical loads and hence to react to grid needs. The proposed optimization scheme is evaluated in a simulation study based on the simulation platform TRNSYS. A detailed evaluation of the algorithm in different application scenarios has been conducted by using a comprehensive system model of the investigated solar heat pump system. The evaluation presents the impact of different characteristics of the incentivizing price signal as well as prediction errors onto the load shifting and cost saving potential.
- Building Energy Management in the FZI House of Living LabsInfoDetails
Birger Becker, Fabian Kern, Manuel Loesch, Ingo Mauser, Hartmut Schmeck, Springer, 2015
The FZI House of Living Labs is a research and demonstration environment that facilitates interdisciplinary research, development, and evaluation in real-life scenarios. It consists of various Living Labs addressing different research topics. In the Living Lab smartEnergy, solutions for the energy system of the future are investigated. For this reason, the whole FZI House of Living Labs has been equipped with building automation, distributed generation, thermal and electrical storage, and technologies that enable the flexibilization of energy supply and demand. The equipment, among others, includes a photovoltaic and battery storage system, a micro combined heat and power plant, and an adsorption chiller. A building energy management system was developed that integrates various communication technologies, and hence enables monitoring, data recording, visualization, and the integrated optimization of the devices and systems. This way, flexibilities can be utilized with regard to different optimization goals such as an increased self-consumption, or the provisioning of grid-supporting services.
- Comparison of Request Admission Based Performance Isolation Approaches in Multi-Tenant SaaS ApplicationsInfoDetails
Rouven Krebs, Manuel Loesch, 2014
In the Software-as-a-Service model one single application instance is usually shared between different tenants to decrease operational costs. However, sharing at this level may lead to undesired influence from one tenant onto the performance observed by the others. Intentionally, the application does not manage hardware resources and the responsible OS is not aware of application level entities like tenants. Consequently, it is difficult to control the performance of individual tenants to make sure they are isolated. In this paper we present an overview and classification of methods to ensure performance isolation based on request admission control. Further, informational requirements of these methods are discussed.
- Demand Side Management in Smart Buildings by Intelligent Scheduling of Heat PumpsInfoDetails
Manuel Loesch, Dominik Hufnagel, Sebastian Steuer, Tillman Faßnacht, Hartmut Schmeck, 2014
A major component of the future Smart Grid is an adaptive demand side that allows to handle the fluctuating power supply based on renewable energies. In this paper, we present an evolutionary algorithm that allows for shifting electrical loads generated by heat pumps. Our approach is based on overheating the hot water storage in order to get a higher degree of freedom for scheduling. In our scenario, we assume time-variable price and load limitation signals as well as a prediction for local power generation from photovoltaic panels to incentivize the load shifting. Using these signals, we consider the future thermal demand to schedule the heat pump such that electricity costs are decreased. Our simulations show that heat pumps and hot water storages bear potential to shift loads over a time span of up to multiple hours, thus providing economical storage capacity. In doing so and based on electricity prices from the stock exchange, we were able to significantly decrease electricity costs for operating the heat pump.
- Platform-as-a-Service Architecture to Provide Performance Isolated Multi-Tenant ApplicationsInfoDetails
Rouven Krebs, Manuel Loesch, Samuel Kounev, 2014
Software-as-a-Service (SaaS) often shares one single application instance among different tenants to reduce costs. However, sharing potentially leads to undesired influence from one tenant onto the performance observed by the others. This is a significant problem as performance is one of the major obstacles for cloud customers. The application does intentionally not manage hardware resources, and the operating system is not aware of application level entities like tenants which makes the performance control a challenge. In case the SaaS is hosted on a Platform-as-a-Service (PaaS), the SaaS developer usually wants to control performance-related issues according to individual needs, and available information is even more limited. Thus, it is difficult to control the performance of different tenants to keep them isolated. Existing work focuses on concrete methods to provide performance isolation in systems where the whole stack is under control. In this paper we present a concrete PaaS enhancement which enables application developers to realize isolation methods for their hosted SaaS application. In a case study we evaluated the applicability and effectiveness of the enhancement in different environments.
- Conceptual Approach for Performance Isolation in Multi-Tenant SystemsInfoDetails
Manuel Loesch, Rouven Krebs, 2013
Multi-tenant applications (MTAs) share one application instance among several customers to increase the efficiency. Due to the tight coupling, customers may influence each other with regards to the performance they observe. Existing research focuses on methods and concrete algorithms to performance-isolate the tenants. In this paper, we present conceptual concerns raised when serving a high amount of users. Based on a load balancing cluster of multiple MTAs, we identified potential positions in an architecture where performance isolation can be enforced based on request admission control. Our discussion shows that different positions come along with specific pros and cons that have influence on the ability to performance-isolate tenants.
- TRNSYS-Java Coupler: A TRNSYS type that allows for a bi-directional communication with JavaInfoDetails
Manuel Loesch, 2014
TRNSYS is a software environment used to simulate the behavior of transient systems, providing many components commonly found in thermal and electrical energy systems. This TRNSYS type allows for a bi-directional communication between TRNSYS and Java. After specifying the number of inputs and outputs of the type within the TRNSYS enviornment, respective links to other components can be established. In every simulation step, the type consumes a certain amount of inputs and sends the values to Java. Based on this, a certain amount of outputs is generated in Java, send back to TRNSYS and used as the type's output for the current simulation step. The communication between the TRNSYS type and the Java class is based on the Java Native Interface (JNI).
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- Locations for Performance Ensuring Admission Control in Load Balanced Multi-Tenant SystemsInfoDetails