检索结果-内蒙古大学图书馆

4th ACM International Conference on Distributed Event-Based Systems, DEBS 2010

作者： Schröter, Arnd Mühl, Gero Kounev, Samuel Parzyjegla, Helge Richling, Jan Communication and Operating Systems Group Berlin University of Technology Germany Architecture of Application Systems University of Rostock Germany Institute for Program Structures and Data Organization Karlsruhe Institute of Technology Germany

ISBN: (纸本)9781605589275

Publish/subscribe systems are used increasingly often as a communication mechanism in loosely-coupled distributed applications. With their gradual adoption in mission critical areas, it is essential that systems are subjected to a rigorous performance analysis before they are put into production. However, existing approaches to performance modeling and analysis of publish/subscribe systems suffer from many limitations that seriously constrain their practical applicability. In this paper, we present a set of generalized and comprehensive analytical models of publish/subscribe systems employing different peer-to-peer and hierarchical routing schemes. The proposed analytical models address the major limitations underlying existing work in this area and are the first to consider all major performance-relevant system metrics including the expected broker and link utilization, the expected notification delay, the expected time required for new subscriptions to become fully active, as well as the expected routing table sizes and message rates. To illustrate our approach and demonstrate its effectiveness and practicality, we present a case study showing how our models can be exploited for capacity planning and performance prediction in a realistic scenario. © 2010 ACM.

关键词： Analytical models

来源：评论

学校读者我要写书评

暂无评论

Secure Business Processes in Service-Oriented Architectures -- A Requirements Analysis

Secure Business Processes in Service-Oriented Architectures ...

引用

European Conference on Web Services (ECOWS)

作者： Jens Muller Jutta Mulle Silvia von Stackelberg Klemens Bohm Institute of Program Structures and Data Organization Karlsruhe Institute of Technology Karlsruhe Germany

Business-process-management systems are increasingly used in service-oriented architectures (SOA), coordinating activities of loosely coupled information systems, of web services, and of human actors. This often requires exchanging and processing sensitive, personally-identifiable information, e.g., in e-employability and e-health applications. Supporting security in such a service-oriented environment is challenging. Existing approaches focus on security in service-oriented architectures but neglect business-process specific characteristics. Motivated by a real-world business process from the e-employability domain, in this paper we collect security requirements, exploiting the specific properties and semantics of business processes. We evaluate the requirements with respect to the state of the art of suitable security mechanisms and identify possible solutions as well as remaining gaps. We see this article as an important prerequisite for the design and implementation of advanced security mechanisms for business processes.

关键词： Business Access control Service oriented architecture Authentication Humans

来源：评论

学校读者我要写书评

暂无评论

Strategic Provider Selection in a Policy-Based Helping Scenario

Strategic Provider Selection in a Policy-Based Helping Scena...

引用

IEEE International Conference on E-Commerce technology Workshops

作者： Christian Hutter Jing Zhi Yue Christian von der Weth Klemens Bohm Institute of Program Structures and Data Organization Karlsruhe Institute of Technology Germany

In service-oriented computing, software agents interact by requesting and providing services. Since providing a service incurs cost, uncooperative behavior dominates in the absence of an incentive mechanism. An economic model that describes interactions between individuals is the Helping Game. There, pairs of requester and provider are randomly matched. In various real-world applications in turn, several providers offer similar services, and requesters have a choice of providers. The rationale behind strategic provider selection is to choose the provider that is most likely to perform the task as desired. The results from existing studies of the Helping Game are not directly applicable to settings with provider selection. To analyze how strategic provider selection affects the efficiency of enterprise systems, we have designed and carried out an experimental study. Our results show that cooperative participants receive significantly more requests than uncooperative ones, making cooperation expensive. We conclude that system designers must incentivize requesters to balance their tasks between providers.

关键词： Games Economics Biological system modeling Manuals Software agents Analytical models Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Parallelizing an index generator for desktop search 10

Parallelizing an index generator for desktop search

引用

Proceedings of the 2010 international conference on Computer Architecture

作者： David J. Meder Walter F. Tichy Institute for Program Structures and Data Organization (IPD) University of Karlsruhe Karlsruhe Germany

ISBN: (纸本)9783642243219

Experience with the parallelization of an index generator for desktop search is presented. Several configurations of the index generator are compared on three different Intel platforms with 4, 8, and 32 cores. The optimal configurations for these platforms are not intuitive and are markedly different for the three platforms. For finding the optimal configuration, detailed measurements and experimentation were necessary. Several recommendations for parallel software design are derived from this study.

关键词： multicore parallelization parallel software design index generator

来源：评论

学校读者我要写书评

暂无评论

SONAR: Towards User-centric Social Network Analysis and Visualization

SONAR: Towards User-centric Social Network Analysis and Visu...

引用

IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Christian Hütter Björn-Oliver Hartmann Klemens Böhm Till Heistermann Kevin-Simon Kohlmeyer Reno Reckling Martin Reiche David Soria Parra Institute for Program Structures and Data Organization Karlsruhe Institute of Technology Germany MAYFLOWER GmbH München Germany

Social network analysis (SNA) has attracted a lot of attention over the past years. Existing tools for SNA do not allow a user-centric analysis of the social neighborhood, i.e., the subgraph of the user's friends and friends of a friend. In this paper, we introduce SONAR, an open source Web application for user-centric SNA. Its extensible architecture and flexible data model allows developers to embed SONAR directly into social networking websites. A performance evaluation shows that our application scales well with the number of users and adds only minimal overhead to the SNA algorithms.

关键词： Sonar Servers data models Tin Social network services data visualization Computer architecture

来源：评论

学校读者我要写书评

暂无评论

Tackling Compliance Deficits of data-Protection Law with User Collaboration - A Feasibility Demonstration with Human Participants

Tackling Compliance Deficits of Data-Protection Law with Use...

引用

IEEE International Conference on E-Commerce technology Workshops

作者： Thorben Burghardt Erik Buchmann Klemens Böhm Jürgen Kühling Simon Bohnen Anastasios Sivridis Institute for Program Structures and Data Organization Karlsruhe Institute of Technology (KIT) Karlsruhe Germany Chair for Public Law and Real Estate Law University of Regensburg Regensburg Germany

In the recent past, there have been frequent reports on privacy violations by service providers on the Web. The providers are overstrained with the legal implications of processing personal data. data-protection authorities in turn are overburdened with the enforcement of the regulations. Users themselves typically cannot identify those violations, due to missing expertise in data-protection law. In this paper we propose and evaluate CAPE (Collaborative Access to Privacy Enhancement), an approach that makes data-protection law accessible to all parties involved in the processing of personal information. To this end, we transform legal expertise on data protection into intuitive questions that anyone can answer. CAPE is 'Web 2.0', in the sense that individuals answer the questions they can, and they benefit from the answers of others. To identify violations, we compare the answers to answer patterns defined apriori that indicate a violation. The main innovation is the combination of Web 2.0 functionality with the structured approach (sequences of closed questions in particular) lawyers use to identify violations. In extensive user studies, we show that users can identify 81% of those violations legal experts find. Further, individuals answer our questions with a high degree of agreement, independent from their background knowledge.

关键词： Law Privacy Taxonomy Communities Internet data privacy

来源：评论

学校读者我要写书评

暂无评论

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

引用

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2010年 6092 LNCS卷 VI页

作者： Grunske, Lars Reussner, Ralf Swinburne University of Technology Faculty of ICT John Street Melbourne VIC 3122 Australia Institute for Program Structures and Data Organization Am Fasanengarten 5 76131 Karlsruhe Germany

来源：评论

学校读者我要写书评

暂无评论

Automatic checklist generation for the assessment of UML models

Automatic checklist generation for the assessment of UML mod...

引用

Models in Software Engineering, MODELS 2008

作者： Gelhausen, Tom Landhauber, Mathias Korner, Sven Institute for Program Structures and Data Organization University of Karlsruhe 76131 Karlsruhe Germany

ISBN: (纸本)9783642016479

Assessing numerous models from students in written exams or homework is an exhausting *** present an approach for a fair and transparent assessment of the completeness of models according to a natural language domain description. The assessment is based on checklists generated by the tool Sumo. Sumo directly works on an annotated version of the original exam text, so no 'gold standard' is needed.

关键词： Unified Modeling Language

来源：评论

学校读者我要写书评

暂无评论

Reducing search space of auto-tuners using parallel patterns

Reducing search space of auto-tuners using parallel patterns

引用

ICSE Workshop on Multicore Software Engineering, IWMSE

作者： Christoph A. Schaefer Institute of Program Structures and Data Organization University of Karlsruhe Karlsruhe Germany

ISBN: (纸本)9781424437184

Auto-tuning is indispensable to achieve best performance of parallel applications, as manual tuning is extremely labor intensive and error-prone. Search-based auto-tuners offer a systematic way to find performance optimums, and existing approaches provide promising results. However, they suffer from large search spaces. In this paper we propose the idea to reduce the search space using parameterized parallel patterns. We introduce an approach to exploit context information from Master/Worker and Pipeline patterns before applying common search algorithms. The approach enables a more efficient search and is suitable for parallel applications in general. In addition, we present an implementation concept and a corresponding prototype for pattern-based tuning. The approach and the prototype have been successfully evaluated in two large case studies. Due to the significantly reduced search space a common hill climbing algorithm and a random sampling strategy require on average 54% less tuning iterations, while even achieving a better accuracy in most cases.

关键词： Pipelines Prototypes Sampling methods Testing Yarn Tuners Libraries Performance gain Performance evaluation Predictive models

来源：评论

学校读者我要写书评

暂无评论

Indirect Reciprocity in Policy-Based Helping Experiments

Indirect Reciprocity in Policy-Based Helping Experiments

引用

European Conference on Web Services (ECOWS)

作者： Christian von der Weth Klemens Böhm Thorben Burghardt Christian Hütter Jing Zhi Yue Institute for Program Structures and Data Organization Universität Karlsruhe (TH) Karlsruhe Germany

In service-oriented architectures, participants keep interacting by exchanging tasks, in order to increase their benefit. Since carrying out a task incurs costs, and participants often interact with unknown partners, uncooperative behavior dominates in the absence of a mechanism. A well-known economic model describing this situation is the Helping Game. In previous helping experiments, participants decide 'by hand' before each interaction whether to carry out the task or not. In online environments however, such manual decisions are infeasible. This paper focuses on policy-based helping experiments, i.e., participants formulate policies stating when exactly they accept a task. This approach gives way to many questions, e.g., what kinds of policies are formulated, how do the policies affect the outcome of the experiments, is the outcome different from the ones of previous helping experiments, how does it depend on the language used to formulate policies, etc. In an extensive study, we address these and related questions. As a result, most participants behave strategically and make use of information on the previous behavior of others. The results indicate that participants perceive that cooperative behavior pays off. Further, despite the infinite policy space, we could discover eight meaningful categories to classify all formulated policies.

关键词： Service oriented architecture Grid computing Web services Costs Environmental economics Cultural differences Global communication Semiconductor optical amplifiers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：