The Experts below are selected from a list of 1629 Experts worldwide ranked by ideXlab platform

Marit Kjøsnes Natvig - One of the best experts on this subject based on the ideXlab platform.

  • A Feasibility Study of an Agile and Data-Centric Method for Prototyping Services Based on Open Transport Data
    Communications in Computer and Information Science, 2020
    Co-Authors: Nicolas Ferry, Aida Omerovic, Marit Kjøsnes Natvig
    Abstract:

    Data under open licenses and in reusable formats, often referred to as “open data”, is increasingly being made accessible by both public and private actors. Government institutions, municipalities, private companies and entrepreneurs are among the stakeholders either having visions of new open data-based Services, or just looking for new ideas on potential innovations based on open data. It is, however, in both cases, often unclear to the Service Developers how the open data actually can be utilized. A main reason is that the data needs to be retrieved from multiple sources, understood, quality checked and processed. While gaining insights on possible Services that can be created on the top of open data, a Service Developer has to undergo an iterative “trying and failing” exercise of Service prototyping. In order to be practically feasible, such a process needs to be agile and efficient. Open data from the transport sector is in this study particularly focused on and used as a case. The open transport data are characterized by many challenges common for open data in general, but also a few specific ones. One of those challenges is the need for combining (often real-time) data from rather many sources in order to create a new Service. This paper is an extension of our earlier research, which introduced a novel data-centric and agile approach to early Service prototyping based on open transport data. In particular, we present a refinement of the initial approach and its evaluation in a significantly extended trial and discussion about the lessons learned from it.

  • CLOSER - Towards Early Prototyping of Services based on Open Transport Data: A Feasibility Study
    Proceedings of the 9th International Conference on Cloud Computing and Services Science, 2019
    Co-Authors: Nicolas Ferry, Aida Omerovic, Marit Kjøsnes Natvig
    Abstract:

    Data under open licenses and in reusable formats, often referred to as ”open data”, is increasingly being made accessible by both public and private actors. Government institutions, municipalities, private companies and entrepreneurs are among the stakeholders either having visions of new open data-based Services, or just looking for new ideas on potential innovations based on open data. It is, however, in both cases, often unclear to the Service Developers how the open data actually can be utilized. A main reason is that the data needs to be retrieved from multiple sources, understood, quality checked and processed. While gaining insights on possible Services that can be created on the top of open data, a Service Developer has to undergo an iterative ”trying and failing” exercise of Service prototyping. In order to be practically feasible, such a process needs to be agile and efficient. Open data from the transport sector is used as a case. The open transport data are characterized by many challenges common for open data in general, but also a few specific ones. One of those challenges is the need for combining (often real-time) data from rather many sources in order to create a new Service. In this paper we propose an agile approach to early Service prototyping and we try out the approach on an open transport data Service. Finally, we propose the priorities for future work towards a comprehensive approach for agile prototyping of open transport data-based Services.

  • towards early prototyping of Services based on open transport data a feasibility study
    International Conference on Cloud Computing and Services Science, 2019
    Co-Authors: Nicolas Ferry, Aida Omerovic, Marit Kjøsnes Natvig
    Abstract:

    Data under open licenses and in reusable formats, often referred to as ”open data”, is increasingly being made accessible by both public and private actors. Government institutions, municipalities, private companies and entrepreneurs are among the stakeholders either having visions of new open data-based Services, or just looking for new ideas on potential innovations based on open data. It is, however, in both cases, often unclear to the Service Developers how the open data actually can be utilized. A main reason is that the data needs to be retrieved from multiple sources, understood, quality checked and processed. While gaining insights on possible Services that can be created on the top of open data, a Service Developer has to undergo an iterative ”trying and failing” exercise of Service prototyping. In order to be practically feasible, such a process needs to be agile and efficient. Open data from the transport sector is used as a case. The open transport data are characterized by many challenges common for open data in general, but also a few specific ones. One of those challenges is the need for combining (often real-time) data from rather many sources in order to create a new Service. In this paper we propose an agile approach to early Service prototyping and we try out the approach on an open transport data Service. Finally, we propose the priorities for future work towards a comprehensive approach for agile prototyping of open transport data-based Services.

B. Freisleben - One of the best experts on this subject based on the ideXlab platform.

  • COMPSAC - WS-TemporalPolicy: A WS-Policy Extension for Describing Service Properties with Time Constraints
    2008 32nd Annual IEEE International Computer Software and Applications Conference, 2008
    Co-Authors: Markus Mathes, Steffen Heinzl, B. Freisleben
    Abstract:

    A Web Service has several functional properties (e.g. its operations) and non-functional properties (e.g. quality of Service and security parameters). Functional properties are usually static, whereas non-functional properties are often dynamic and thus vary over time. To describe properties with time constraints, the paper introduces WS-TemporalPolicy. WS-TemporalPolicy empowers a Service Developer to attach a validity period to the properties described in a WS-policy. The generation, validation, storage and retrieval, and deployment process of temporal policies is supported by the Temporal Policy Runtime Environment. Implementation issues and two use cases are presented to illustrate the use of temporal policies.

Seung Il Jin - One of the best experts on this subject based on the ideXlab platform.

  • ICCSA (3) - An effective XML-based sensor data stream processing middleware for ubiquitous Service
    Lecture Notes in Computer Science, 1
    Co-Authors: Hun Soon Lee, Seung Il Jin
    Abstract:

    As sensor-related technologies have improved, ubiquitous Services which give convenience to people using them are increasing more and more. It is necessary to make Service Developer's best endeavors to provide these Services. In this paper, we propose a novel XML-based sensor data stream processing middleware called UbiCore (Ubiquitous Core) which helps Service Developer to make ubiquitous Service easily. UbiCore manages scattered diverse sensors, collects data from sensors, processes collected sensor data, and automatically delivers the processed results to the related back-end applications. We can save the developing cost of ubiquitous Service by using the proposed middleware.

Jorn Altmann - One of the best experts on this subject based on the ideXlab platform.

  • value creation in software Service platforms
    Future Generation Computer Systems, 2016
    Co-Authors: Netsanet Haile, Jorn Altmann
    Abstract:

    In order to benefit from operating an IT Service platform (e.g., SaaS platform), platform providers need to find a way to keep their existing users and application Services active sources of value. However, the understanding of how to achieve that is limited due to the newness of this kind of business. This paper investigates whether all stakeholders of the platform ecosystem can generate sufficient value when participating in the platform. As stakeholders, we consider application Service users, Service Developers, and Service platform providers. We also analyse the interrelationship between these stakeholders. The analysis outcome is a value creation model that allows the calculation of the stakeholders' values. The model also helps inferring the relative impact of different factors on the evolution of values of the software Service platform stakeholders. Our simulation results confirm that all stakeholders of a Service platform mainly benefit from a growing installed base of application users. However, in a mature market, a large Service variety mainly benefits the Service platform provider, while the other stakeholders obtain a reduced increase in their benefits. In particular, the utility growth of application users becomes constrained as the benefit from new connections with other users decreases and the number of new Services used decreases. Similarly, the revenue of Service Developer decreases, making Service development less profitable. Therefore, we can state that not only a large fraction of the value creation goes to the platform provider but also that the software Service ecosystem can collapse, if no mutually beneficial pricing of Services is implemented. Design of a value creation model for software Service platforms.Simulation of three platform scenarios with the help of the value creation model.Discussion and implications of the value distribution within software Service ecosystems.

Maria-eleni Anagnostou - One of the best experts on this subject based on the ideXlab platform.

  • IS&N - Service Logic Deployment and Distribution Configuration
    Intelligence in Services and Networks Paving the Way for an Open Service Market, 1999
    Co-Authors: A.k. Kaltabani, P.p. Demestichas, E.c. Tzifa, Elsa Cardoso, António Rito Silva, Maria-eleni Anagnostou
    Abstract:

    The success of Service providers in the competitive communications market of the future will be determined by the efficiency with which Services are developed, and the quality levels at which Services are provided. A Service creation environment (SCE) should provide the Service Developer with solutions to these problems. In this paper we present two essential facilities that should be provided by an advanced SCE: a tool for the optimisation of the Service logic deployment scheme and a distribution configuration language supporting the deployment and configuration of component-based distributed applications.

  • ISCC - Advanced Service creation in distributed heterogeneous environments
    Proceedings Third IEEE Symposium on Computers and Communications. ISCC'98. (Cat. No.98EX166), 1998
    Co-Authors: N.i. Liossis, N.d. Polydorou, P.p. Demestichas, E.c. Tzifa, Maria-eleni Anagnostou
    Abstract:

    Important factors that will determine the success of Service providers in the competitive communications market of the future are the efficiency with which the Services will be developed, the "quality" of the Service deployment, and the quality levels at which the Services will be provided. A Service creation environment (SCE) should provide the Service Developer with solutions to these problems. In this paper we present an SCE focusing on some essential characteristics, namely, the Service creation practice underlying the operation of the SCE, and realisation in terms of existing software technologies and tools, the support of standardised Service architectures.

  • ICC - Issues in Service creation for future open distributed processing environments
    1999 IEEE International Conference on Communications (Cat. No. 99CH36311), 1
    Co-Authors: P.p. Demestichas, N.i. Liossis, N.d. Polydorou, E.c. Tzifa, A.k. Kaltabani, S.a. Kotrotsos, Maria-eleni Anagnostou
    Abstract:

    The success of Service providers in the competitive communications market of the future will be determined by the efficiency with which the Services will be developed, and the quality levels at which the Services will be provided. A Service creation environment (SCE) should provide the Service Developer with solutions to these problems. In this paper we present an SCE focusing on the Service creation practice, the software technologies applied for the development of the Service logic, the support of standardised Service architectures, through libraries of Service components, and the provision of QoS handling related facilities.