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2011 IEEE International Conference on Internet of Things, iThings 2011 and 4th IEEE International Conference on Cyber, Physical and Social Computing, CPSCom 2011

作者： Hahm, Oliver Gunes, Mesut Juraschek, Felix Blywis, Bastian Schmittberger, Nicolai Institute of Computer Science Computer Systems and Telematics Distributed Embedded Systems Freie Universitat Berlin Germany

ISBN: (纸本)9780769545806

Next to traditional communication systems like servers or routers at the backbone and personal computers or laptops acting as clients, the Future Internet will additionally comprise many so-called smart objects. Most of everyday devices like coffee machines, fridges, or light switches will participate in this Internet of Things (IoT). Small-sized computers will connect these devices to the network by establishing low power wireless links. To achieve this vision various kinds of wireless multihop networks (WMHNs) play an important role. During the last years, it has become clear that testbed-based research is mandatory in order to develop suitable protocol implementations and metrics for these networks. In this article, we review network configurations for wireless networks for the IoT. We describe the DESTestbed at the Freie Universität Berlin as an experimental facility to study these network configurations. In addition to the infrastructure and software provided by the testbed, we introduce μkleos as a microkernel based operating system for embedded devices. We designed μkleos with a special focus on Wireless Sensor Networks (WSNs) to complement our approach to study WMHNs. μkleos provides an implementation of 6LoWPAN to interconnect WSNs to IP-based networks. © 2011 IEEE.

关键词： Wireless sensor networks

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Deep learning enhanced prediction of microwave dielectric constant of spinel ceramics eliminating manual feature engineering

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Materials Today Physics 2025年 54卷

作者： Liu, Xiaobin Huang, Qiuxia Su, Chang Shao, Ning Zhang, Lei Tian, Yapeng Zhou, Huanfu College of Physics and Electronic Information Engineering Guilin University of Technology Guilin514004 China College of Computer Science and Engineering Guilin University of Technology Guilin514004 China Guangxi Key Laboratory of Embedded Technology and Intelligent Systems Guilin University of Technology Guilin514004 China Henan Institute of Advanced Technology College of Materials Science and Engineering Zhengzhou University Zhengzhou450003 China School of Materials Science and Engineering Guilin University of Technology Guilin514004 China

Machine learning (ML) has demonstrated considerable promise and superiority in the prediction of microwave dielectric ceramic (MWDC) properties. Nonetheless, applying traditional ML models often requires processing numerous features, making their implementation complex and unwieldy. In this work, a deep learning (DL) model named CRANCNN-M2V that predicts the dielectric constant of spinel-MWDCs eliminating manual feature engineering has been constructed. The model can identify essential features directly from chemical compositions using the data embedding method. Our model further improved the network based on a Compositionally Restricted Attention-based Neural Network (CrabNet) and showed the enhanced prediction performance in the dielectric constant of spinel-MWDCs, achieving an RMSE of 1.52, an MAE of 0.938, and an R2 of 0.954, and it also outperformed commonly used traditional ML models (e.g., XGBoost, Random Forest (RF), Decision Tree (DT), etc.). Furthermore, the contribution of different elements in the dielectric constant of spinel MWDCs has been analyzed via our CRANCNN-M2V model. Highly accurate and efficient prediction of our model will effectively promote the design and development of spinel-MWDCs applied for wireless communication. © 2025 Elsevier Ltd

关键词： Prediction models

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Characterizing and optimizing Java-based HPC applications on Intel many-core architecture

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science China(Information sciences) 2017年第12期60卷 207-223页

作者： Yang YU Tianyang LEI Haibo CHEN Binyu ZANG School of Computer Science Fudan University Institute of Parallel and Distributed Systems Shanghai Jiao Tong University

The increasing demand for performance has stimulated the wide adoption of many-core accelerators like IntelR Xeon PhiTMCoprocessor, which is based on Intel’s Many Integrated Core architecture. While many HPC applications running in native mode have been tuned to run efficiently on Xeon Phi, it is still unclear how a managed runtime like JVM performs on such an architecture. In this paper, we present the first measurement study of a set of Java HPC applications on Xeon Phi under JVM. One key obstacle to the study is that there is currently little support of Java for Xeon Phi. This paper presents the result based on the first porting of Open JDK platform to Xeon Phi, in which the Hot Spot virtual machine acts as the kernel execution engine. The main difficulty includes the incompatibility between Xeon Phi ISA and the assembly library of Hotspot *** evaluating the multithreaded Java Grande benchmark suite and our ported Java Phoenix benchmarks, we quantitatively study the performance and scalability issues of JVM on Xeon Phi and draw several conclusions from the study. To fully utilize the vector computing capability and hide the significant memory access latency on the coprocessor, we present a semi-automatic vectorization scheme and software prefetching model in Hot *** with 60 physical cores and tuning, our optimized JVM achieves averagely 2.7 x and 3.5 x speedup compared to Xeon CPU processor by using vectorization and prefetching accordingly. Our study also indicates that it is viable and potentially performance-beneficial to run applications written for such a managed runtime like JVM on Xeon Phi.

关键词： many-core Java Xeon Phi HPC prefetching

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G-Mesh-Lab wireless multi-hop network testbed for the G-Lab

G-Mesh-Lab wireless multi-hop network testbed for the G-Lab

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6th International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, TRIDENTCOM 2010

作者： Güneş, Mesut Hahm, Oliver Schleiser, Kaspar Distributed Embedded Systems Computer Systems and Telematics Institute of Computer Science Freie Universität Berlin Germany

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MoNoTrac - A mobility trace generator based on OpenStreetMap geo-data

MoNoTrac - A mobility trace generator based on OpenStreetMap...

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2010 IEEE 7th International Conference on Mobile Adhoc and Sensor systems, MASS 2010

作者： Güneş, Mesut Juraschek, Felix Blywis, Bastian Graff, Christian Institute of Computer Science - Distributed Embedded Systems Freie Universität Berlin Germany

ISBN: (纸本)9781424474882

Simulations of mobile networks require the specification of the node movement. The movement is either computed based on mathematical models or given by previously recorded mobility traces. The Mobile Node Trace Generator (MoNoTrac) is a mobility trace generator based on OpenStreetMap data. The simulation area is selected from a real city map and the movement of nodes of different kinds, such as cars and pedestrians, is simulated on this geographical data. We adapt two popular mobility models in a way that they respect the geographical and structural constraints. MoNoTrac produces an XML-based metaformat which may be converted to formats required by popular network simulators such as ns-2/3 and OMNeT++. The goal of the MoNoTrac framework is to ease the development process of more realistic mobility models that are based on real geo data. ©2010 IEEE.

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DES-SERT: A framework for structured routing protocol implementation

DES-SERT: A framework for structured routing protocol implem...

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2009 2nd IFIP Wireless Days, WD 2009

作者： Blywis, Bastian Güneş, Mesut Juraschek, Felix Schmidt, Philipp Kumar, Pardeep Distributed Embedded Systems Institute of Computer Science Freie Universität Berlin Germany

ISBN: (纸本)9781424456604

Routing is a general task, yet the implementation of routing protocols requires specific operating system related knowledge. The developer has to deal with particular kernel internals that might have severe side effects. This is especially true for reactive and hybrid protocols where routing and forwarding are heavily intermixed. Furthermore, novel routing protocols require features that are not provided by current operating systems or have to be customized. Thus routing protocols for mobile ad-hoc networks and wireless mesh networks are often studied in simulation environments. However, simulations have limitations that can result in conclusions that do not hold in real networks. A framework for the implementation of routing protocols in operating systems is required to enable real world oriented research. We introduce the DES Simple and Extensible Routing-Framework for Testbeds (DES-SERT). The framework supports the implementation and evaluation of routing protocols in a testbed environment. A structured protocol implementation is advocated by transmitting data in extensions attached to packets and by its pipeline based architecture. Several steps are elaborated how to derive an implementation from a routing protocol specification. ©2009 IEEE.

关键词： Testbeds

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A testbed-based study of uni-and multi-path Dynamic Source Routing in a WMN

A testbed-based study of uni-and multi-path Dynamic Source R...

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2010 IFIP Wireless Days, WD 2010

作者： Blywis, Bastian Günes, Mesut Gutzmann, David J.H. Juraschek, Felix Distributed Embedded Systems Institute of Computer Science Freie Universität Berlin Germany

ISBN: (纸本)9781424492299

Dynamic Source Routing (DSR) was one of the first proposed protocols for routing in Mobile Ad-hoc Networks and is among the few that were ratified by the IETF. Despite its source routing overhead, the protocol exhibits particular properties that make it an optimal choice for multi-path routing where multiple paths are discovered for each destination. The alternative paths can either be stored for error recovery situations or used in parallel to improve the throughput. In this paper we present a study of 10 uni- and multi-path DSR variants in a wireless mesh network testbed. A modified ETX metric is proposed for an improved link quality measurement. The experiments are evaluated considering the routing-overhead and packet delivery ratio with focus on the route discovery. © 2010 IEEE.

关键词： Testbeds

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A study of adaptive gossip routing in wireless mesh networks

A study of adaptive gossip routing in wireless mesh networks

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2nd International Conference on Ad Hoc Networks, ADHOCNETS 2010

作者： Blywis, Bastian Güneş, Mesut Hofmann, Sebastian Juraschek, Felix Institute of Computer Science Distributed Embedded Systems Freie Universität Berlin Germany

ISBN: (纸本)3642179932

Gossip routing is an approach to limit the overhead of flooding in wireless networks. Each node, that receives a packet that would normally be flooded, applies a probabilistic approach. The packet is either forwarded with probability p or dropped with 1 - p. This paper is a follow-up to our last study that evaluated the approaches by Haas et al. in the DES-Testbed, a wireless mesh network. Four different gossip routing variants were discussed which used static parameters to determine the value p. In this study, we compare the proposals by four other entities and discuss whether they show an overall improvement regarding the two most important metrics in this domain: reachability and redundancy. We also discuss the assumptions and parameters of the simulation studies in the context of our experiments in a real world deployment. © institute for computer sciences, Social Informatics and Telecommunications Engineering 2010.

关键词： Testbeds

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Computing infrastructure for big data processing

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Frontiers of computer science 2013年第2期7卷 165-170页

作者： Ling LIU Distributed Data Intensive Systems Lab School of Computer Science Georgia Institute of TechnologyUSA Atlanta 30332

With computing systems undergone a fundamen- tal transformation from single-processor devices at the turn of the century to the ubiquitous and networked devices and the warehouse-scale computing via the cloud, the parallelism has become ubiquitous at many levels. At micro level, par- allelisms are being explored from the underlying circuits, to pipelining and instruction level parallelism on multi-cores or many cores on a chip as well as in a machine. From macro level, parallelisms are being promoted from multiple ma- chines on a rack, many racks in a data center, to the glob- ally shared infrastructure of the Internet. With the push of big data, we are entering a new era of parallel computing driven by novel and ground breaking research innovation on elas- tic parallelism and scalability. In this paper, we will give an overview of computing infrastructure for big data processing, focusing on architectural, storage and networking challenges of supporting big data paper. We will briefly discuss emerging computing infrastructure and technologies that are promising for improving data parallelism, task parallelism and encour- aging vertical and horizontal computation parallelism.

关键词： big data cloud computing data analytics elas-tic scalability heterogeneous computing GPU PCM bigdata processing

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External interference-aware distributed channel assignment in wireless mesh networks

External interference-aware distributed channel assignment i...

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5th International Conference on Mobile Ubiquitous Computing, systems, Services and Technologies, UBICOMM 2011;3rd International Workshop on Pervasive Computing in embedded systems, PECES 2011

作者： Juraschek, Felix Güneş, Mesut Blywis, Bastian Distributed Embedded Systems - Institute of Computer Science Freie Universität Berlin Berlin Germany

ISBN: (纸本)9781612081717

Interference is one of the major causes for performance degradation in wireless networks. Channel assignment algorithms have been proven successful to decrease the networkwide interference by using non-overlapping channels for otherwise interfering links. However, external co-located networks and devices are usually not considered in the channel assignment procedure, since they are not under the control of the network operator and their activity is therefore hard to capture. In our work we fill this gap by additionally considering the interference resulting from external devices. The novelty of this approach is that not only co-located IEEE 802.11 networks are captured, but also other sources of interference that utilize the same frequency band. We present the spectrum sensing component DES-Sense, a software solution for 802.11a/b/g that detects congested channels and does not require any changes to the *** present a first algorithm for external interference-aware channel assignment and show proof-of-concept results from the DES-Testbed, a wireless mesh network with 120 multi-radio nodes.

关键词： Mesh generation

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