Prof. Dr. André Ludwig

Publications

Associate Professor of Computer Science in Logistics

Publications

Journal Articles (Peer-Reviewed)

Copy reference link   DOI: 10.5381/jot.2015.14.1.a2.

Abstract: In the past, logistics used to be a core function of production and trading companies but many of them started to outsource at least parts of their logistics functions to specialized logistics service providers in terms of logistics contracts. With this, sophisticated business models such as value added logistics service providers evolved which focus on tasks of planning, coordination and monitoring of entire supply chains involving multiple logistics providers. Challenges remain though, for instance how a complex logistics contract can be planned and how it can be assured that the providers comply with the planned process. In this article, we present a conceptual as well as technical solution to the monitoring of logistics services and show how to reuse this information in a model for the integrated planning of logistics contracts. A simulation model thereby ensures validity of the overall planning. An approach for integrating different models helps to overcome the problem of utilizing multiple models. Finally, an example scenario shows how each part contributes to a successful planning process for logistics contracts.

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Copy reference link   DOI: 10.3233/MGS-2007-3303

Abstract: Service compositions enable users to realize their complex needs as a single request. Despite intensive research, especially in the area of business processes, web services and grids, an open and valid question is still how to manage service compositions in order to satisfy both functional and non-functional requirements as well as adapt to dynamic changes. This article describes an approach towards adaptive management of QoS aware service compositions. This approach integrates well known concepts and techniques and proposes various execution strategies based on dynamic selection and negotiation of services included in a service composition, contracting based on service level agreements, service enactment with flexible support for exception handling, monitoring of service level objectives, and profiling of execution data. An important element of the approach is an open architecture for adaptive service composition management. Its first prototypical implementation has been developed within an EU-funded Adaptive Service Grid project.

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Journal Articles (Professional)

Copy reference link   DOI: 10.1007/s35764-016-0082-y

Abstract: Nach wie vor ist das Thema Datenschutz eine der größten Herausforderungen bei der Nutzung von Cloud-Systemen. Eine Möglichkeit zur Sicherstellung des Datenschutzes besteht in der Dezentralisierung der Datenhaltung und Datenzugriffssteuerung. In diesem Artikel stellen wir eine Systemarchitektur für dezentrale Datenhaltung und Datenschutz auf Basis von Storage Clouds vor. Dabei werden die Datenbestände dezentral in Private-Cloud-Systemen durch Nutzer selbst verwaltet. Eine unabhängige Administrationskomponente regelt die Zugriffs- und Verteilungsrechte auf diese Daten. Ein von uns entwickelter Prototyp zeigt die Umsetzung am Beispiel eines sozialen Netzwerks.

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Books

Conference Proceedings

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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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Copy reference link   DOI: 10.5220/0005377801660176

Abstract: The objective of tactical planning in logistics is the engineering and evaluation of processes within a given set of possible alternatives. Due to outsourcing and a division of labor, a high number of participants, available services and thus possible process alternatives arises within logistics networks. The additional wide range of service description and annotation methods result in a complex planning process. In order to support planning, a semi-automated approach is presented in this paper that is based on a combined catalog and construction system (for engineering) and a generic simulation approach (for evaluation) that are able to handle the variety of description and annotation methods. The basic concepts are presented and afterward associated by a model-driven approach in order to connect them and make them compatible to work with each other. Finally, a method is developed to foster a semi-automated engineering and evaluation of process alternatives.

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Copy reference link   DOI: 10.1007/978-3-319-19027-3_23

Abstract: Global demands and emerging markets resulted in a rise of complexity in logistics over the last years. Furthermore, producing companies outsourced their logistics for reasons of flexibility. Hence, clients consult solution specialists for customer-focused end-to-end processes. The 4th party logistics business model offers an overall service management throughout an entire logistics chain by planning and controlling inherent processes. But because physical provisioning is outsourced to 3rd party providers, performance measurement is essential in order to meet service levels. Measuring sub providers poses difficulties because of different process definitions and communication standards. A relief is the growing amount of information during the process lifecycle. In this paper we present an integrated, strategically aligned provider rating model, applicable throughout the entire logistics process and capable of summing up operational information into ratios that are further aggregated into key performance indicators. Thereafter, we prove its applicability through a prototypical implementation.

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Copy reference link   DOI: 10.1007/978-3-319-06695-0_16

Abstract: With the principle of division of labor in logistics, an integrator can focus on planning and monitoring within a network, while subsidiary logistics service providers (LSPs) are responsible for the actual physical manipulation of goods. Because of heterogeneous service descriptions, processes and IT-systems, the integrator requires a platform that provides the ability to interact with LSPs and to plan, execute and monitor contracts for integrator’s customers. Such an integration platform is currently developed in the research project Logistics Service Engineering & Management. Crucial to such a platform is the ability to maintain a complete catalog and to efficiently identify and choose appropriate services. In this paper a metamodel-based approach is presented facing these requirements.

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Copy reference link   DOI: 10.1007/978-3-319-06695-0_22

Abstract: Driven by rising competitive constraints companies began to outsource at least parts of their internal activities to specialized external logistics providers in terms of contracts. Thereby, new business models like the fourth party logistics evolved, which acts like coordinator of the emerging logistics networks. The main task of the provider is the planning, monitoring and measurement of the different networks of its customers. Based on a method to integrate process modeling and their simulation, complex event processing to gather real-time information about process executions and service profiles to measure subsequent service providers’ quality – a closed loop approach for improving the quality of service provisioning is presented.

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Copy reference link   DOI: 10.1007/978-3-642-38827-9_26

Abstract: The logistics service industry is characterized by a high level of collaboration between logistics customers and providers. In fact, sophisticated, knowledge-intense business models such as fourth party and lead logistics evolved in recent years that are responsible for planning, coordination, and monitoring entire supply chains across logistics companies. The Logistics Service Engineering and Management (LSEM) platform is a service-oriented infrastructure for the development and management of collaborative contract logistics enabling fourth party and lead logistics. The service modeling framework (SMF) is a central element of the LSEM-platform. It allows users of the platform to define, manage and combine logistics services from different providers and allows for an integrated view on complex services setups. In this paper, the Service Meta Modeling Editor is presented as an essential part of the SMF. It allows connecting and integrating various types of service models and avoids the need to define and maintain a complex, global service model. Instead a comprehensive service model is built bottom-up in that elements from different models are linked on a metamodel level.

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Abstract: Der Logistikdienstleistungssektor ist gekennzeichnet durch arbeitsteilige, kurz- und mittelfristige Zusammenarbeit von spezialisierten Logistikdienstleistern. Insbesondere sogenannte Fourth Party Logistics (4PL) Dienstleister stehen permanent vor der Aufgabe, unterschiedliche Logistikdienstleister und deren Informationssysteme ad hoc und ohne Medienbrüche in unternehmensübergreifende Informationsflüsse zu integrieren. Die Logistik Service Engineering & Management (LSEM) Plattform als Integrationsplattform für 4PL nimmt diese Anforderungen auf und stellt einen stufenweisen, modellgetriebenen Integrationsansatz bereit. In diesem Beitrag werden neben der LSEM Plattform selbst, die durch die Plattform unterstützen Integrationsarten vorgestellt. Näher beschrieben wird daneben ein Lösungsansatz zur modellgetriebenen Integration vonAnwendungssystemen in die LSEM Plattform.

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Abstract: The success of an enterprise is largely determined by its ability andflexibility to react to changes and its business process stability and safeness. Innovative technologies help to improve the execution and management of business processes and ensure that a competitive position can be achieved or enhanced. Radio frequency identification is such an innovative technology with a high potential of optimisation within business processes for example for reduction of processing time and failure rates. By means of a practical case study this paper gives recommendations and shows how RFID can improve business processes.

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Abstract: SSME and SOA are strongly connected perspectives. SOA modelingprocedures, SOA management methodologies, SOA role concepts, and many otherimportant aspects heavily depend and base on specific SOA service types defined in aservice taxonomy. However, currently we are far from a consistent taxonomicunderstanding which causes communication problems regarding nearly all SOA issueshampering research as well as implementation efforts in this field. This paper reflects thecurrent state of discussion by mapping several relevant proposals and presents a basicservice taxonomy aiming at stopping the proliferation of service types. This basictaxonomy can be used as a basis for domain- or project-specific taxonomic refinements.

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Abstract: Service oriented architecture (SOA) has emerged as a popular software paradigm for integrating distributed applications. Services are generally regarded as interoperable building blocks for constructing, integrating, and merging applications. However, existing SOA based solutions often focus on solving technical integration problems while neglecting business-level capabilities which are most important for organizations. In this paper, we introduce the notion of capabilities as an important concept for business management. We identify major shortcomings of the existing service based solutions and outline a novel approach for capability oriented configuration and management that can react to the dynamically changing nature of business integration environments.

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Copy reference link   DOI: 10.5220/0003982502590264

Abstract: A recurring task when managing logistics networks in which logistics companies jointly offer services is the comparison of logistics services based on their underlying processes. The comparison is necessary for the integration of processes, the selection of logistics providers and the evaluation of a company's performance. Due to a high diversity of logistics services and their properties as well as due to the high amount of services automated logistics service comparison is needed to support this task. This paper presents basic requirements and evaluates the state of the art with regard to these requirements. In addition, an initial solution approach providing a solid base for future work is outlined.

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Copy reference link   DOI: 10.1109/SRII.2012.22

Abstract: The logistics industry is characterized by a high level of collaboration between logistics customers and providers. In fact, sophisticated, knowledge-intense business models such as 4th party logistics providers that are responsible for planning, coordination, and monitoring entire supply chains across logistics companies can be observed. However, integrated approaches for engineering and management of fourth party logistics are rather in its infancy. The Logistics Engineering and Management platform is a service-oriented approach for the development and management of long and mid-term logistics contracts. It serves as a collaboration platform and integrates services from different logistics providers. In this paper a core feature of the platform is presented, a service repository as a single point of truth coping with the complexity of miscellaneous service descriptions and models. Central idea behind this repository is the integration of different specialized service models and the construction of a comprehensive model, which supports direct implementation of services as concrete logistics tasks. In this article we present preliminary results of the service repository's development and realization and an outlook for future research.

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Copy reference link   DOI: http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=6930627

Abstract: This paper introduces the concept of the Logistics Service Map, a modular service construction system with an inherent catalog function. Specialized service providers, so called logistics integrators are to use this concept to integrate subsidiary service providers into logistics networks. The main purpose of the Service Map is to enable and to foster the development of atomic as well as composite logistics services used by the integrator to fulfill customers' requirements. After a brief presentation of the applied research methodology, the current progress of research is outlined and a draft of future research activities and discussion points is given.

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