The KLU faculty, post-docs, and PhD candidates regularly publish the results of their research in scientific journals. You will find a complete overview of all KLU publications below (e.g. articles in peer-reviewed journals, professional journals, books, working papers, and conference proceedings). Search for relevant terms and keywords, or filter the list by name, year of publication or type of publication. The references include DOIs and abstracts where available, and you can download them to your own reference database or platform. We regularly update the database with new publications.

Books

Conference Proceedings

Copy reference link   DOI: 10.5220/0005918500390047

Abstract: Utility, defined as the perceived satisfaction with a service, provides the ideal means for decision making on the level of individual entities and collectives participating in a large-scale dynamic system. Previous works have already introduced the concept into the area of collective adaptive systems, and have discussed what is the necessary infrastructure to support the realization of the involved theoretical concepts into actual decision making. In this work we focus on two aspects. First, we provide a concrete utility model for a case study that is part of a larger research project. Second, we incorporate this model into our implementation of the proposed architecture. More importantly, we design and execute an experiment that aims to empirically evaluate the use of utility for decision making by comparing it against simpler decision making mechanisms.

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Abstract: With an ongoing division of labor and concentration on core competencies in logistics, the flexibility and quality in logistics services can be increased in terms of contracting specialists for each step in a supply chain. In order to participate in such an environment and act successfully on the market, it is essential for logistics service providers to follow a service oriented paradigm and modularize their service portfolio from static end-to-end solutions to a flexible set of modular services. One of the main challenges is to find a ’suitable’ level of granularity for the modularization of existing logistics services. In this paper a conceptual framework of service granularity levels is developed. A systematic literature review is conducted in order to find existing concepts of service granularity. Findings are analyzed and finally synthesized towards their suitability for logistics services. Domain specific composition is supported by the logistics service map concept that contains catalog and construction kit for modular services. The paper’s contribution is a Service Granularity Framework dedicated to specialized scholars of service science and practitioners of logistics.

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Abstract: ObjectivesThe significance of Logistics Service Providers (LSPs) has risen steadily during the last decades due to trends like logistics outsourcing or the structural change in the types of goods transported. From the freight transport modeller's point of view, integrating LSPs into freight transport models is essential to be capable of describing possible future developments. Especially important is the knowledge of the spatial distribution patterns of LSP locations e.g. to represent network routing of mixed cargo shipments more accurately. Moreover, attributes characterizing the LSP locations are helpful to relate them to traffic generation. Therefore, the objective of this paper is to present intermediate results of empirical work on LSP locations in Germany and their multiple attributes. Drawing on these findings we generate LTL freight for Germany.Data and methodologyFirstly, to identify spatial patterns of LSP locations, a secondary data analysis on the German LSP´s sites was conducted. Data on LSPs and their logistics locations including attributes like geolocation, employment, operations area, infrastructure access, or market segments served was collected. The resulting database was further combined with publicly accessible data e.g. to compute distances to highways. In this paper, the results of statistical analyses on the sample are presented. The sample´s representativeness and completeness of the database are discussed as well. Secondly we generate the LTL freight of LSPs based on generation rates and the location database. The model results are verified in two different ways.Expected resultsThe findings of this paper shed some light on the locations of the German LSP sector and the freight transport it generates. These insights especially include spatial configuration and are highly relevant for freight transport and land use planning policies. In addition, we show a new freight demand generation model based on data of logistics locations or, if we find a way to generate them synthetically, based on more available statistical data.

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Copy reference link   DOI: 10.5220/0005342000280036

Abstract: The concept of reuse in process models is extensively studied in the literature. Sub-processes, process templates,process variants, and process reference models are employed as reusable elements for process modeling.Additionally, the notion of process fragments has been introduced to capture parts of a process model and store them for later reuse. In contrast, concepts for reuse of processes that cross the boundaries of organizations, i.e., choreographies, have not yet been studied in the appropriate level of detail. In this paper, we introduce the concept of choreography fragments as reusable elements for choreography modeling. Choreography fragments can be extracted from choreography models, adapted, stored, and inserted into new models. We provide a formal model for choreography fragments and identify a set of patterns constituting frequently occurring meaningful choreography fragments.

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Copy reference link   DOI: doi:10.1007/978-3-319-26148-5_22

Abstract: Scientists that use the workflow paradigm for the enactment of scientific experiments need support for trial-and-error modeling, as well as flexibility mechanisms that enable the ad hoc repetition of workflow logic for the convergence of results or error handling. Towards this goal, in this paper we introduce the facilities to repeat partially or completely running choreographies on demand. Choreographies are interesting for the scientific workflow community because so-called multi-scale/field (multi-*) experiments can be modeled and enacted as choreographies of scientific workflows. A prerequisite for choreography repetition is the rewinding of the involved participant instances to a previous state. For this purpose, we define a formal model representing choreography models and their instances as well as a concept to repeat choreography logic. Furthermore, we provide an algorithm for determining the rewinding points in each involved participant instance.

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Abstract: The success of the Cloud computing paradigm, together with the increase of Cloud providers and optimized Infrastructure-as-a-Service (IaaS) offerings have contributed to a raise in the number of research and industry communities that are strong supporters of migrating and running their applications in the Cloud. Focusing on eScience simulation-based applications, scientific workflows have been widely adopted in the last years, and the scientific workflow management systems have become strong candidates for being migrated to the Cloud. In this research work we aim at empirically evaluating multiple Cloud providers and their corresponding optimized and non-optimized IaaS offerings with respect to their offered performance, and its impact on the incurred monetary costs when migrating and executing a workflow-based simulation environment. The experiments show significant performance improvements and reduced monetary costs when executing the simulation environment in off-premise Clouds.

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