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78th ARFTG Microwave Measurement Conference: High Power RF Measurement Techniques, ARFTG 2011

作者： Hillebrand, Jürgen Kieß, Steffen Wróblewski, Marek Simon, Sven University of Stuttgart Institute of Parallel and Distributed Systems D-70569 Stuttgart Germany

ISBN: (纸本)9781467302814

This paper presents a method for S-parameter extraction of passive sub-circuits embedded in complex microwave circuits. We employed computed tomography (CT) scans and measured substrate material parameters. The principle is based on the automatic reconstruction of CAD models from CT image data. Such CAD models represent the geometry of the actual manufactured passive microwave circuits and are suited for 3D electromagnetic field simulation to extract the S-parameters of these devices non-destructively. It is shown that by supplementing the simulation model with measured material parameters the agreement between the simulated S-parameters and the measured S-parameters can be improved. The proposed method has been applied to a passive 90° hybrid coupler, which is embedded in a hybrid power amplifier circuit. © 2011 IEEE.

关键词： Timing circuits

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Automatic topology completion of TOSCA-based cloud applications 44

Automatic topology completion of TOSCA-based cloud applicati...

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44. Jahrestagung der Gesellschaft fur Informatik INFORMATIK 2014 - Big Data - Komplexitat meistern - Big Data - Mastering Complexity: 44th Annual Meeting of the Society for Computer Science, INFORMATICS 2014

作者： Hirmer, Pascal Breitenbücher, Uwe Binz, Tobias Leymann, Frank Institute for Parallel and Distributed Systems University of Stuttgart Germany Institute of Architecture of Application Systems University of Stuttgart Germany

ISBN: (纸本)9783885796268

Automation of application provisioning is one of the key aspects of Cloud Computing. Standards such as the Topology and Orchestration Specification for Cloud Applications (TOSCA) provide a means to model application topologies which can be provisioned fully automatically. Many automated provisioning engines require that these topologies are complete in the sense of specifying all application, platform, and infrastructure components. However, modeling complete models is a complex, timeconsuming, and error-prone task that typically requires a lot of technical expertise. In this paper, we present an approach that enables users to model incomplete TOSCA application topologies that are completed automatically to deployable, complete models. This enables users to focus on the business-relevant application components and simplifies the creation process tremendously by minimizing the required effort and know-how. We prove the technical feasibility of the presented approach by a prototypical implementation based on the open source modeling tool Winery. In addition, we evaluate the approach by standards-compliance and performance.

关键词： Cloud platforms

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Vinothek - A self-service portal for TOSCA 6

Vinothek - A self-service portal for TOSCA

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6th Central European Workshop on Services and their Composition, ZEUS 2014

作者： Breitenbücher, Uwe Binz, Tobias Kopp, Oliver Leymann, Frank Institute of Architecture of Application Systems University of Stuttgart Germany Institute for Parallel and Distributed Systems University of Stuttgart Germany

The TOSCA standard provides a means to describe Cloud applications and their management in a portable way. TOSCA-based applications can be deployed on various standard-compliant TOSCA Runtimes. Vinothek is a Web-based Self-Service Portal that hides the technical details of TOSCA Runtimes and provides end users a simple graphical interface to provision Cloud applications on demand. This demonstration shows how Vinothek supports automated provisioning of applications and how it facilitates integrating TOSCA Runtimes.

关键词： Portals

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Simpl – A framework for accessing external data in simulation workflows

Simpl – A framework for accessing external data in simulati...

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2011 Datenbanksysteme fur Business, Technologie und Web, BTW 2011 - 14. Fachtagung des GI-Fachbereichs "Datenbanken und Informationssysteme", DBIS 2011 - Database systems for Business, Technology and Web, BTW 2011 - 14th Conference of the GI Department "Databases and Information systems", DBIS 2011

作者： Reimann, Peter Reiter, Michael Schwarz, Holger Karastoyanova, Dimka Leymann, Frank Institute of Architecture of Application Systems University of Stuttgart Germany Institute of Parallel and Distributed Systems University of Stuttgart Germany

ISBN: (纸本)9783885792741

Adequate data management and data provisioning are among the most important topics to cope with the information explosion intrinsically associated with simulation applications. Today, data exchange with and between simulation applications is mainly accomplished in a file-style manner. These files show proprietary formats and have to be transformed according to the specific needs of simulation applications. Lots of effort has to be spent to find appropriate data sources and to specify and implement data transformations. In this paper, we present SIMPL – an extensible framework that provides a generic and consolidated abstraction for data management and data provisioning in simulation workflows. We introduce extensions to workflow languages and show how they are used to model the data provisioning for simulation workflows based on data management patterns. Furthermore, we show how the framework supports a uniform access to arbitrary external data in such workflows. This removes the burden from engineers and scientists to specify low-level details of data management for their simulation applications and thus boosts their productivity. © 2011 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Information management

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Unified Enclave Abstraction and Secure Enclave Migration on Heterogeneous Security Architectures

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Journal of Computer Science & Technology 2022年第2期37卷 468-486页

作者： Jin-Yu Gu Hao Li Yu-Bin Xia Hai-Bo Chen Cheng-Gang Qin Zheng-Yu He Engineering Research Center for Domain-Specific Operating Systems Ministry of EducationShanghai 200240China Institute of Parallel and Distributed Systems Shanghai Jiao Tong UniversityShanghai 200240China Ant Group Hangzhou 310099China

ion and secure enclave migration on heterogeneous security architectures.

关键词： heterogeneous trusted execution environment(TEE) enclave abstraction enclave migration

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FNotify: A Low-Latency and Scalable Publish/Subscribe System using RDMA 24

FNotify: A Low-Latency and Scalable Publish/Subscribe System...

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24th IEEE International Conference on High Performance Computing and Communications, 8th IEEE International Conference on Data Science and systems, 20th IEEE International Conference on Smart City and 8th IEEE International Conference on Dependability in Sensor, Cloud and Big Data systems and Application, HPCC/DSS/SmartCity/DependSys 2022

作者： Xu, Yusen Shen, Sijie Han, Mingcong Chen, Rong Institute of Parallel and Distributed Systems Seiee Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9798350319934

Publish/subscribe systems are widely used as messaging middleware in various scenarios, such as online business, financial trading, and social media. However, the network overhead intro-duced by the pub/sub system can severely impact application performance. Especially in the latency-sensitive applications of the data center, optimizing the latency of publishing or delivering messages of the pub/sub system is particularly important. RDMA network has gained popularity in relevant applications due to its low latency, high bandwidth and ability to bypass the CPU. Never-theless, it is still challenging to design and optimize the pub/sub system using RDMA. Through an in-depth analysis of RDMA features, we design and implement FNotify, a high-performance RDMA-accelerated pub/sub system. FNotify optimizes latency and CPU load using in-memory message management and one-sided RDMA primitives for message collection. FNotify also proposes a topic-based partitioning scheme to achieve good scal-ability. We conducted a comprehensive evaluation and analysis on an 8-node RDMA cluster to verify the validity of our design by comparing the performance of FNotify with Apache Kafka (a state-of-the-art pub/sub system) in a typical pub/sub application scenario and various micro-benchmarks. Experimental results show that FNotify improves overall performance by 1.5× to 3.9× and reduces end-to-end latency by more than 20× compared to Apache Kafka. © 2022 IEEE.

关键词： Middleware

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Serialization/Deserialization-free State Transfer in Serverless Workflows 24

Serialization/Deserialization-free State Transfer in Serverl...

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19th European Conference on Computer systems, EuroSys 2024

作者： Lu, Fangming Wei, Xingda Huang, Zhuobin Chen, Rong Wu, Minyu Chen, Haibo Institute of Parallel and Distributed Systems Seiee Shanghai Jiao Tong University China Shanghai Artificial Intelligence Laboratory China University of Electronic Science and Technology of China China Institute of Parallel and Distributed Systems Germany

ISBN: (纸本)9798400704376

Serialization and deserialization play a dominant role in the state transfer time of serverless workflows, leading to substantial performance penalties during workflow execution. We identify the key reason as a lack of ability to efficiently access the (remote) memory of another function. We propose RMMap, an OS primitive for remote memory map. It allows a serverless function to directly access the memory of another function, even if it is located remotely. RMMap is the first to completely eliminates serialization and deserialization when transferring states between any pairs of functions in (unmodified) serverless workflows. To make remote memory map efficient and feasible, we co-design it with fast networking (RDMA), OS, language runtime, and serverless platform. Evaluations using real-world serverless workloads show that integrating RMMap with Knative reduces the serverless workflow execution time on Knative by up to 2.6 × and improves resource utilizations by 86.3%. © 2024 ACM.

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S-parameter extraction of bond wires based on em field simulations of computed tomography-generated 3D CAD models

S-parameter extraction of bond wires based on em field simul...

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2012 IEEE 16th Workshop on Signal and Power Integrity, SPI 2012

作者： Hillebrand, Jurgen Kieß, Steffen Wróblewski, Marek Simon, Sven University of Stuttgart Institute of Parallel and Distributed Systems Universittsstrae 38 Stuttgart 70569 Germany

ISBN: (纸本)9781467315043

In this paper a method is proposed for extracting S-parameters of bond wires using computed tomography (CT) analysis techniques and 3D EM field simulations. The method is based on the generation of bond wire CAD models from CT image data. Such models represent the geometry of the actual manufactured devices and are suitable for use in 3D EM field simulation for non-destructive evaluation of the S-parameters of these devices. To demonstrate this approach two CAD models of bond wires-one of a BGA package and one of a test object-have been generated. The computed S-parameters obtained from EM field simulation using the model of the test object have been compared to a measurement with a vector network analyzer. The proposed method is especially suitable for evaluation and analysis of bond wires in microwave or high-speed digital IC packages. It can be combined with other extraction methods for an S-parameter extraction of a full IC packages. © 2012 IEEE.

关键词： Parameter extraction

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Experience using processes for pervasive applications

Experience using processes for pervasive applications

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36th Jahrestagung der Gesellschaft fur Informatik e.V. (GI): Informatik fur Menschen, INFORMATIK 2006

作者： Urbanski, Stephan Handte, Marcus Schiele, Gregor Rothermel, Kurt Distributed Systems Department Institute of Parallel and Distributed Systems Universität Stuttgart Universitätsstr. 38 70569 Stuttgart Germany

ISBN: (纸本)9783885791874

Pervasive Computing envisions seamless computing support for users while performing their everyday tasks. Many of these tasks are hard to capture by the notion of a single application as their requirements on computing support vary over time. To ease the development of applications for such tasks, we have designed an application model for process-oriented pervasive applications, called Sentient Processes, and a supporting middleware system implementing the flow control for processes. In this paper, we show the capabilities of the Sentient Process model to capture everyday user tasks by the example of a process supporting a student in managing his classes during a term.

关键词： Ubiquitous computing

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Enhancing Data Trustworthiness in Explorative Analysis: An Interactive Approach for Data Quality Monitoring

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SN Computer Science 2024年第5期5卷 465页

作者： Behringer, Michael Hirmer, Pascal Villanueva, Alejandro Rapp, Jannis Mitschang, Bernhard Institute for Parallel and Distributed Systems University of Stuttgart Universitätsstr. 38 Stuttgart 70569 Germany

The volume of data to be analyzed has increased tremendously in recent years. In order to extract knowledge from this data, domain experts gain new insights with the help of graphical analysis tools for explorative analyses. Here, the reliability and trustworthiness of an exploratory analysis is determined by the quality of the underlying data. Existing approaches require manual testing to ensure data quality which is often neglected. This research aims to introduce a novel interactive approach for seamlessly integrating data quality considerations into the process of explorative data analysis conducted by domain experts. We derive requirements, conduct an extensive literature review, and develop an approach that efficiently combines stakeholders’ strengths, allowing unobtrusive data quality integration in interactive analysis. Our approach enhances trustworthiness due to unobtrusive monitoring of data quality within the context of explorative data analysis. Domain experts gain insights more reliably, bridging the gap between technical requirements and domain expertise. In conclusion, our research presents a promising solution for improving the reliability and trustworthiness of explorative data analysis, especially for domain experts who may lack technical knowledge. By seamlessly integrating data quality into the analytical process, we empower domain experts to extract valuable insights from the ever-increasing volume of data, thereby advancing the field of data-driven decision-making. © The Author(s) 2024.

关键词： Data Quality Data Mashups Explorative Data Analysis Human-in-the-Loop

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