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1st International Workshop on Mobile Services and Personalized Environments, MSPE 2006

作者： Kuhn, Michael Wattenhofer, Roger Computer Engineering Networks Laboratory ETH Zurich Zurich8092 Switzerland

ISBN: (纸本)9783885791966

Community related applications such as dating platforms, instant messengers, or file-sharing tools enjoy a great popularity in the Internet. Motivated by this success, community-awareness also has become a hot topic in the mobile world. Despite considerable efforts, however, mobile solutions still cannot compete with their Internet counterparts. A key feature of community-aware applications is profile matching. To a large extent, the missing popularity of mobile approaches can be explained with the problems traditional one-to-one keyword matching causes in a purely decentralized environment: Expressive keywords are unlikely to match because of a lack in user density, and a superficial keyword classification misses the application needs. Hence, we face the challenge to compare characteristic topics in purely mobile applications. To address this challenge, this paper presents a fundamentally new matching scheme based on a combination of topology analysis and distance labeling. Proof-of-concept experiments demonstrate that the proposed scheme has indeed the potential to facilitate the comparison of highly specialized keywords in mobile environments. © 2006 Gesellschaft fur Informatik (GI). All rights reserved.

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Thermal-aware task assignment for real-time applications on multi-core systems

Thermal-aware task assignment for real-time applications on ...

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10th International Symposium on Formal Methods for Components and Objects, FMCO 2011

作者： Schor, Lars Yang, Hoeseok Bacivarov, Iuliana Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9783642358869

The reduced feature size of electronic systems and the demand for high performance lead to increased power densities and high chip temperatures, which in turn reduce the system reliability. Thermal-aware task allocation and scheduling algorithms are promising approaches to reduce the peak temperature of multi-core systems with real-time constraints. However, as long as the worst-case chip temperature is not incorporated into system analysis, no guarantees on the performance can be given. This paper explores thermal-aware task assignment strategies for real-time applications with non-deterministic workload that are running on a multi-core system. In particular, tasks are assigned to the multi-core system so that the worst-case chip temperature is minimized and all real-time deadlines are met. Each core has its own clock domain and the static assigned frequency corresponds to the minimum operation frequency such that no real-time deadline is missed. Finally, we show that the proposed temperature minimization problem can efficiently be solved by metaheuristics. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Thermoanalysis

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On the scheduling of fault-tolerant mixed-criticality systems 14

On the scheduling of fault-tolerant mixed-criticality system...

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51st Annual Design Automation Conference, DAC 2014

作者： Huang, Pengcheng Yang, Hoeseok Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781479930173

We consider in this paper fault-tolerant mixed-criticality scheduling, where heterogeneous safety guarantees must be provided to functionalities (tasks) of varying criticalities (im-portances). We model explicitly the safety requirements for tasks of different criticalities according to safety standards, assuming hardware transient faults. We further provide analysis techniques to bound the effects of task killing and service degradation on the system safety and schedulability. Based on our model and analysis, we show that our problem can be converted to a conventional mixed-criticality schedul-ing problem. Thus, we broaden the scope of applicability of the conventional mixed-criticality scheduling techniques. Our proposed techniques are validated with a realistic flight management system application and extensive simulations. Copyright 2014 ACM.

关键词： Scheduling

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On the topologies formed by selfish peers

On the topologies formed by selfish peers

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25th Annual ACM Symposium on Principles of Distributed Computing 2006

作者： Moscibroda, Thomas Schmid, Stefan Wattenhofer, Roger Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)1595933840

Current peer-to-peer (P2P) systems often suffer from a large fraction of freeriders not contributing any resources to the network. Various mechanisms have been designed to overcome this problem. However, the selfish behavior of peers has aspects which go beyond resource sharing. This paper studies the effects on the topology of a P2P network if peers selfishly select the peers to connect to. In our model, a peer exploits locality properties in order to minimixe the latency (or response times) of its lookup operations. At the same time, the peer aims at not having to maintain links to too many other peers in the system. By giving tight hounds on the price of anarchy, we show that the resulting topologies can be much worse than if peers collaborated. Moreover, the network may never stabilize, even in the absence of churn. Finally, we establish the complexity of Nash equilibria in our game theoretic model of P2P networks. Specifically, we prove thai it is NP-hard to decide whether our game has a Nash equilibrium and can stabilize. Copyright 2006 ACM.

关键词： computer networks

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Expandable process networks to efficiently specify and explore task, data, and pipeline parallelism

Expandable process networks to efficiently specify and explo...

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2013 International Conference on Compilers, Architecture and Synthesis for Embedded Systems, CASES 2013

作者： Schor, Lars Yang, Hoeseok Bacivarov, Luliana Thiele, Lothar Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781479914005

Running each application of a many-core system on an isolated (virtual) guest machine is a widely considered solution for performance and reliability issues. When a new application is started, the guest machine is assigned with an amount of computing resources that depends on the overall workload of the system and is not known to the designer at specification time. For instance, the computing resources might consist of many slow or a few fast processing elements. If the application is statically specified, as, for example, with Kahn process networks, the number of processing elements usable by an application is upper bounded by its number of processes. Similarly, the inter-process communication overhead might limit the maximum performance if the number of processing elements is significantly smaller than the number of processes. In this paper, we propose a formal extension for streaming programming models called expandable process networks (EPNs) that tackles this challenge by abstracting several possible granularities in a single specification. This enables the automatic exploration of task, data, and pipeline parallelism by two basic design transformation techniques, namely replication and unfolding. Then, the EPN semantics facilitates the synthesis of multiple design implementations that are all derived from one high-level specification. At runtime, the best fitting implementation for the given computing resources is selected to maximize the performance. Finally, we demonstrate the effectiveness of the proposed model on Intel's 48-core SCC processor. © 2013 IEEE.

关键词： Specifications

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SaFT: Reliable transpart in mobile networks

SaFT: Reliable transpart in mobile networks

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2006 IEEE International Conference on Mobile Ad Hoc and Sensor Sysetems, MASS

作者： Heimlicher, Simon Baumann, Rainer May, Martin Plattner, Bernhard Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)1424405076

End-to-end transport protocols perform poorly in mobile environments, primarily due to the frequent route breaks induced by node mobility. We present a framework for hop-by-hop transport protocols and propose a new reliable transport protocol: SaFT (Store-and-Forward Transport). We evaluate its performance in mobile ad hoc networks vis-a-vis TCP. Overall, SaFT achieves up to 3 times faster delivery of messages in such networks. We conclude that store-and-forward protocols are suited well to provide reliable communication in mobile ad hoc networks. © 2006 IEEE.

关键词： Network protocols

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Multiobjectivization for parameter estimation: A case-study on the segment polarity network of Drosophila

Multiobjectivization for parameter estimation: A case-study ...

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11th Annual Genetic and Evolutionary Computation Conference, GECCO-2009

作者： Hohm, Tim Zitzler, Eckart Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781605583259

Mathematical modeling for gene regulative networks (GRNs) provides an effective tool for hypothesis testing in biology. A necessary step in setting up such models is the estimation of model parameters, i.e., an optimization process during which the difference between model output and given experimental data is minimized. This parameter estimation step is often difficult, especially for larger systems due to often incomplete quantitative data, the large size of the parameter space, and non-linearities in system behavior. Addressing the task of parameter estimation, we investigate the influence multiobjectivization can have on the optimization process. On the example of an established model for the segment polarity GRN in Drosophila, we test different multiobjectivization scenarios compared to a singleobjective function proposed earlier for the parameter optimization of the segment polarity network model. Since, instead of a single optimal parameter setting, a set of optimal parameter settings exists for this GRN, the comparison of the different optimization scenarios focuses on the capabilities of the different scenarios to identify optimal parameter settings showing good diversity in the parameter space. By embedding the objective functions in an evolutionary algorithm (EA), we show the superiority of the multiobjective approaches in exploring the model's parameter space. Copyright 2009 ACM.

关键词： Parameter estimation

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Integrating decision space diversity into hypervolume-based multiobjective search 10

Integrating decision space diversity into hypervolume-based ...

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12th Annual Genetic and Evolutionary Computation Conference, GECCO-2010

作者： Ulrich, Tamara Bader, Johannes Zitzler, Eckart Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781450300728

Multiobjective optimization in general aims at learning about the problem at hand. Usually the focus lies on objective space properties such as the front shape and the distribution of optimal solutions. However, structural characteristics in the decision space can also provide valuable insights. In certain applications, it may even be more important to find a structurally diverse set of close-to-optimal solutions than to identify a set of optimal but structurally similar solutions. Accordingly, multiobjective optimizers are required that are capable of considering both the objective space quality of a Pareto-set approximation and its diversity in the decision space. Although NSGA, one of the first multiobjective evolutionary algorithms, explicitly considered decision space diversity, only a few other studies address that issue. It therefore is an open research question how modern multiobjective evolutionary algorithms can be adapted to search for structurally diverse high-quality Pareto-set approximations. To this end we propose an approach to integrate decision space diversity into hypervolume-based multiobjective search. We present a modified hypervolume indicator and integrate it into an evolutionary algorithm. The proof-of-principle results show the potential of the approach and indicate further research directions for structure-oriented multiobjective search. Copyright 2010 ACM.

关键词： Multiobjective optimization

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Thermal-aware system analysis and software synthesis for embedded multi-processors 11

Thermal-aware system analysis and software synthesis for emb...

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Proceedings of the 48th Design Automation Conference

作者： Thiele, Lothar Schor, Lars Yang, Hoeseok Bacivarov, Iuliana Computer Engineering and Networks Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781450306362

Nowadays, the reliability and performance of modern embedded multi-processor systems is threaten by the everincreasing power densities in integrated circuits, and a new additional goal of software synthesis is to reduce the peak temperature of the system. However, in order to perform thermal-aware mapping optimization, the timing and thermal characteristics of every candidate mapping have to be analyzed. While the task of analyzing timing characteristics of design alternatives has been extensively investigated in recent years, there is still a lack of methods for accurate and fast thermal analysis. In order to obtain desired evaluation times, the system has to be simulated at a high ab]ion level. This often results in a loss of accuracy, mainly due to missing knowledge of system's characteristics. This paper addresses this challenge and presents methods to automatically calibrate high-level thermal evaluation methods. Furthermore, the viability of the methods for automated model calibration is illustrated by means of a novel high-level thermal evaluation method. © 2011 ACM.

关键词： Thermoanalysis

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A design method for high fabrication tolerance integrated optical mode multiplexer

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Science China(Information Sciences) 2020年第6期63卷 184-194页

作者： Bitao SHEN Haowen SHU Linjie ZHOU Xingjun WANG State Key Laboratory on Advanced Optical Communication Systems and Networks Department of ElectronicsSchool of Electronics Engineering and Computer Science Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Nano-optoelectronics Frontier Center of Ministry of Education Peking University

The tapered asymmetric directional coupler has the potential to realize high fabrication tolerance and high transmission efficiency on-chip mode multiplexer. However, the geometry parameter selection of tapered structure remains empirical. In this paper, we propose a design method for the tapered structure based on genetic algorithm. Combined with the adjusted coupling equations and interpolation method, lowtime-cost optimization can be realized. Three mode multiplexers(TE0&TE1, TE0&TE2 and TE0&TE5)are designed by our method. According to simulation results, the insertion loss of the designed devices is lower than 1.8 dB and the crosstalk is lower than-15 dB when the fabrication error is within required range(±10 nm for TE0&TE2 and TE0&TE5, and ±20 nm for TE0&TE1) in the bandwidth of 1.5–1.6 μm. In addition, the entire optimization process takes only 2 h for each device, which is around the time cost of a single 3 D simulation.

关键词： mode multiplexer directional coupler taper structure coupled-mode theory genetic algorithm

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