@article{StantchevTammUllrich2011, author = {Stantchev, Vladimir and Tamm, Gerrit and Ullrich, Sebastian}, title = {Marktpl{\"a}tze in der Cloud: Application Stores f{\"u}r mobile und webbasierte Dienste}, series = {ISIS Cloud und SaaS Report 2011}, journal = {ISIS Cloud und SaaS Report 2011}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-689}, pages = {99 -- 101}, year = {2011}, abstract = {Cloud-Computing, insbesondere „Software as a Service (SaaS)" und „Platform as a Service (PaaS)" ist zugleich Herausforderung und Chance f{\"u}r IT-Anwender. Marktplatz-Ans{\"a}tze aus der Welt der mobilen Applikationen (App Stores) k{\"o}nnen eine Grundlage f{\"u}r die Vermarktung von Software-Diensten darstellen. Ihre Konzepte lassen sich jedoch nur durch eine erweiterte Betrachtung von funktionalen und nicht-funktionalen Aspekten der webbasierten Dienste in die Welt des Cloud Computing {\"u}bertragen. Application Stores und Marktpl{\"a}tze f{\"u}r webbasierte Dienste (z.B. Asperado, Cloud-Portal, Software-Marktplatz) helfen bei Identifizierung und Bewertung der Angebote und bei der Kommunikation mit potentiellen Kunden.}, language = {de} } @inproceedings{BrueningZapotoczkyIbachetal.2007, author = {Br{\"u}ning, Stefan and Zapotoczky, Johannes and Ibach, Peter and Stantchev, Vladimir}, title = {Cooperative Positioning with MagicMap}, series = {Workshop on Positioning, Navigation and Communication 2007 (WPNC'07)}, booktitle = {Workshop on Positioning, Navigation and Communication 2007 (WPNC'07)}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-695}, pages = {6}, year = {2007}, abstract = {We present MagicMap, a cooperative, hybrid positioning system developed at the Humboldt-University in Berlin. While most other positioning systems are limited to specific scenarios and technologies our system provides means to incorporate any available wireless networking technology. Currently, MagicMap supports WLAN, RFID, and ZigBee as wireless technologies for positioning and Linux, Windows, and Windows CE as platforms. Position calculation and exchange is based on a cooperative approach allowing an open internet community to share the required data.}, language = {en} } @inproceedings{PriceTammStantchev2012, author = {Price, Michael and Tamm, Gerrit and Stantchev, Vladimir}, title = {SaaS Marketplaces - visions from theory and experience from practice}, series = {Proceedings of the 19th Biennial Conference of the International Telecommunications Society (ITS2012), Bangkok}, booktitle = {Proceedings of the 19th Biennial Conference of the International Telecommunications Society (ITS2012), Bangkok}, pages = {24}, year = {2012}, abstract = {Cloud computing, especially Software-as-a-Service (SaaS), changes the IT processes of companies for application deployment, access, usage, maintenance, governance and management. In an age of Bring-Your-Own-Device, small businesses through to globally operating companies increasingly support their employees and customers with SaaS-applications that allow access to internal and external business information. Whether employees are in the office, at a client facility, at home or on the road, they need fast, easy access to business applications with any type of device. SaaS offers companies an interesting alternative to classical on-premise IT solutions. Cloud computing provides innovative applications, high connectivity and performance, cost reduction, flexibility and fast time to market with a minimum of effort. Cloud computing is a special form of outsourcing that has its roots in the fifties. Ten years ago similar concepts to cloud computing e.g. Application Service Providing (ASP) appeared and failed. But it seems that the willingness to use cloud computing is now much higher and the cost pressure effects of the financial crisis also motivate decision makers in companies to focus on cloud computing. This contribution presents the results of actual scientific literature investigations alongside interviews with owners of Software-as-a-Service Marketplaces. It describes several types of SaaS marketplaces using different business models to bring together customers and providers. It shows that SaaS marketplaces are two-sided and demonstrates how platforms are emerging that bundle features into significant value propositions for both sides. This work is relevant to firms who seek business solution recommendations beyond the focus of their on-premise-focussed advisors. It is also relevant for owners and potential owners of SaaS marketplaces and SaaS providers exploring alternatives in their distribution mix.}, language = {en} } @inproceedings{StantchevTamm2010, author = {Stantchev, Vladimir and Tamm, Gerrit}, title = {Towards Ambient Intelligence and the Internet of Services in Healthcare}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-727}, pages = {6}, year = {2010}, abstract = {The emergence of the Internet of Services and the Internet of Devices opens new possibilities for societal computung scenarios. Ambient Intelligence (AmI) is a vision of an environment that puts the needs of the user in the center of the technological design process. An AmI environment consists of ubiquitous distributed devices such as sensors, displays, data memories which are embedded in everyday objects like walls, clothes, tables or the pavement. These devices are interconnected and seamlessly deliver applications and services to the user. AmI emphasizes the intelligence of the environments interfaces and the intelligence that can be achieved by correlating context information from different data sources. In this work we present an approach to transfer the AmI vision to the public services sector using the paradigm of service orientation and Cloud Computing. Based on scenarios in the healthcare sector the benefits and challenges of such transfer are presented.}, language = {en} } @article{IbachMilanovichRichlingetal.2005, author = {Ibach, Peter and Milanovich, Nikola and Richling, Jan and Stantchev, Vladimir and Wiesner, Andre and Malek, Miroslaw}, title = {CERO: CE RObots Community}, series = {IEE Proceedings Software}, volume = {152}, journal = {IEE Proceedings Software}, number = {5}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-733}, pages = {210 -- 214}, year = {2005}, abstract = {We describe our experience creating a robots community using standard hardware and software - the Windows CE operating system, XScale development boards, and LEGO Mindstorm actuators. We focus on an open and extendable distributed robotics system, which in contrast to most existing proprietary robotics systems, supports cost-effective integration and assembly of components while providing dependable communication and coordination. To demonstrate feasibility we have developed the CERO Framework for ad hoc cooperation in robots communities employing a service-oriented architecture with the main building blocks: ad hoc networking for different wireless technologies (e.g., Bluetooth, WLAN, or 433 MHz radio communication), a protocol for interconnecting development board and actuators, and a CE.NET based software framework supporting complex movements, consensus protocols, cooperation, and positioning. It offers high-level interfaces for programming complex tasks in cooperative robotics. We also present an overview of intended applications.}, language = {en} } @inproceedings{WernerRichlingMilanovicetal.2003, author = {Werner, Matthias and Richling, Jan and Milanovic, Nikola and Stantchev, Vladimir}, title = {Composability Concept for Dependable Embedded Systems}, series = {Proceedings of the International Workshop on Dependable Embedded Systems at the 22nd Symposium on Reliable Distributed Systems (SRDS 2003)}, booktitle = {Proceedings of the International Workshop on Dependable Embedded Systems at the 22nd Symposium on Reliable Distributed Systems (SRDS 2003)}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-747}, pages = {5}, year = {2003}, abstract = {Composability is a sought after property. However, whereas there is usually an intuitive understanding of this concept, a clear definition has been frequently missing. In this paper, we refine our concept of composability given in. We see composability as a property of an architecture not of systems. In addition, we do not want to reduce composability to the functional specification; rather, we are focusing on how composability effects the nonfunctional properties, especially the composed system's real-time behavior, its reliability, its security, etc. We see the advantage of our approach in having a wide application domain. It works for functional and non-functional properties, it may consider both, hardware and software, and it allows for a description of composition anomalies. In this paper, we show how to apply our concept to an embedded hardware-software co-designed architecture and to composition and decomposition of dependable services in embedded environments.}, language = {en} } @inproceedings{Stantchev2008, author = {Stantchev, Vladimir}, title = {Service-based Systems in Clinical Environments}, series = {Information Service Design Symposium 2008}, booktitle = {Information Service Design Symposium 2008}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-759}, pages = {19}, year = {2008}, abstract = {In this report we present an architectural approach to add quality-of-service (QoS) assurance and location awareness to service-based systems within existing clinical infrastructures. To address typical design requirements of such systems (e.g., cooperating services, performance and availability) the work proposes a service-oriented architecture (SOA) as architectural concept and architectural translucency to provide stable QoS. We evaluate position sensing systems, QoS assurance approaches and present design principles for service-based health care applications. Furthermore, we present a clinical application scenario and an architectural approach to integrate existing infrastructure into a human centric assistance system.}, language = {en} } @inproceedings{SchubertMautschStantchevetal.2013, author = {Schubert, Johannes and Mautsch, Erik and Stantchev, Vladimir and Tamm, Gerrit}, title = {Rechtliche Rahmenbedingungen f{\"u}r die Datenerhebung durch AAL-Infrastruktur bei der Pflege}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-2607}, pages = {5}, year = {2013}, abstract = {Bei der Datenerhebung und -verarbeitung durch AAL-Infrastruktur im Pflegesektor sind rechtliche Rahmenbedingungen zu pr{\"u}fen, die die Nutzung der Messdaten juristisch zul{\"a}ssig machen. Hierzu wurden die in der praxisnahen Pflegeliteratur dargestellten Rechtsnormen zusammengefasst und kategorisiert. Somit ließ sich ermitteln, welche Daten als sch{\"u}tzenswert zu definieren und mit welchen Sicherungsmaßnahmen zu versehen sind. Auf dieser Basis kann ein Ansatz pr{\"a}sentiert werden, der eine rechtlich unbedenkliche Absicherung aller technischen Elemente bei der Implementierung einer AAL-Infrastruktur in der Pflege erm{\"o}glicht.}, language = {de} } @article{Stantchev2009, author = {Stantchev, Vladimir}, title = {Wissen und Technologieaffinit{\"a}t: Herausforderungen bei der Realisierung eines ambienten Ver- und Entsorgungssystems f{\"u}r die Immobilien des Landes Berlin}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-2645}, pages = {335 -- 338}, year = {2009}, abstract = {Berlin ist eine der großen europ{\"a}ischen Hauptst{\"a}dte mit einem breiten Angebot an {\"o}ffentlichen Dienstleistungen (Public Services). 2003 hat der Berliner Senat den „Landesbetrieb f{\"u}r Geb{\"a}udebewirtschaftung" (LfG) gegr{\"u}ndet, der die Facility Management Aktivit{\"a}ten des Landes b{\"u}ndelt. Seit 2005 wird zusammen mit der TU Berlin der Einsatz innovativer Informations-technologien (IT) in diesem Bereich konsequent erweitert. Die Kombination aus einer unauff{\"a}lligen (unobtrusiven) IT-Infrastruktur und einer fl{\"a}chendeckenden und kontextbezogenen Einsetzbarkeit wird oft als ambient bezeichnet und stellt sehr spezifische Anforderungen an die Gestaltung der Mensch-Maschine-Interaktionen. In diesem Beitrag wird die Gestaltung eines Systems f{\"u}r die Ver- und Entsorgung als Teil der Facility Management Aufgaben beschrieben. Ausgehend von der Beschreibung unseres Vorgehensmodells zur Erhebung der Ist-Prozesse und Usability Evaluation, werden in einem zweiten Schritt Nutzerprofile erstellt und die Ist-Prozesse um diese erweitert. Die zweite H{\"a}lfte des Beitrags beschreibt das eingef{\"u}hrte, ambiente Ver- und Entsorgungssystem, zusammen mit einigen Interaktionsszenarien. Abschließend erfolgt eine Evaluierung der Wirtschaftlichkeit und der Usability des Systems.}, language = {de} } @incollection{StantchevStantcheva2012, author = {Stantchev, Vladimir and Stantcheva, Lubomira}, title = {Applying IT-Governance Frameworks for SOA and Cloud Governance}, series = {Communications in Computer and Information Science}, booktitle = {Communications in Computer and Information Science}, publisher = {SRH Berlin University of Applied Sciences}, pages = {398 -- 407}, year = {2012}, abstract = {Service-oriented architecture (SOA) in the enterprise was one of the key enablers for cloud computing. Therefore, it can serve as a natural fit for bringing traditional IT governance approaches forward to the challenges of cloud governance. In this work we present an approach for mapping IT governance mindsets to the aspects of SOA governance. It allows an IT organisation the adaptation and the continuous usage of already established governance models during the adoption of cloud computing solutions. We also present an application case study where we demonstrate the feasibility of the approach in real-life scenarios in the context of an international telecommunication provider.}, language = {en} } @incollection{StantchevTammPetruch2012, author = {Stantchev, Vladimir and Tamm, Gerrit and Petruch, Konstantin}, title = {Simulation-Based IT Process Governance}, series = {Communications in Computer and Information Science}, volume = {278}, booktitle = {Communications in Computer and Information Science}, editor = {Lytras, Miltiadis D.}, publisher = {Springer}, address = {Berlin}, publisher = {SRH Berlin University of Applied Sciences}, pages = {206 -- 215}, year = {2012}, abstract = {IT departments within enterprises often utilize incident management and ticketing systems. While performance data from such systems is often stored in logfiles it is rarely evaluated extensively. In this work we assess the applicability of an approach for extended evaluation of logged data from such systems. Our evaluation is focused on Key Performance Indicators (KPIs) and aims to discover more in-depth insights as compared to typical data visualization and dashboard techniques. We also present a practical case study where we demonstrate the feasibility of the approach using real-life logfiles from an international telecommunication provider. Our modeling methodology is based on the approach of System Dynamics.}, language = {en} } @article{StantchevTammPetruch2012, author = {Stantchev, Vladimir and Tamm, Gerrit and Petruch, Konstantin}, title = {Assessing and governing IT-staff behavior by performance-based simulation}, series = {Computers in Human Behavior}, volume = {29}, journal = {Computers in Human Behavior}, number = {2}, pages = {473 -- 485}, year = {2012}, abstract = {When optimizing IT operations organizations typically aim to optimize resource usage. In general, there are two kinds of IT resources - IT infrastructures and IT staff. An optimized utilization of these resources requires both quantitative and qualitative analysis. While IT infrastructures can offer raw data for such analyses, data about IT staff often requires additional preparation and augmentation. One source for IT staff-related data can be provided by incident management and ticketing systems. While performance data from such systems is often stored in logfiles it is rarely evaluated extensively. In this article we propose the usage of such data sources for IT staff behavior evaluation and also present the relevant augmentation techniques. We claim that our approach is able to provide more in-depth insights as compared to typical data visualization and dashboard techniques. Our modeling methodology is based on the approach of system dynamics. We also provide formal models and simulation results where we demonstrate the feasibility of the approach using real-life logfiles from an international telecommunication provider.}, language = {en} } @article{StantchevTamm2012, author = {Stantchev, Vladimir and Tamm, Gerrit}, title = {Reducing Information Asymmetry in Cloud Marketplaces}, series = {International Journal of Human Capital and Information Technology Professionals (IJHCITP)}, volume = {3}, journal = {International Journal of Human Capital and Information Technology Professionals (IJHCITP)}, number = {4}, pages = {1 -- 10}, year = {2012}, abstract = {Cloud Computing is emerging as a predominant paradigm for obtaining and providing computing functionality in the enterprise. Organizations that are planning to use cloud computing offerings struggle with the question "How do I choose the right offering?" Cloud offerings exhibit a variety of pricing models and different levels of service and functionality. In this article the authors define first Cloud Computing in the context of IT Governance. Then they set criteria to compare different offerings at the level of Software-as-a-Service (SaaS). This is an important precondition for the reduction of the verifiable information asymmetry and uncertainty in the cloud market. Besides deficiencies on the supply side, regarding configuration, display and communication of service bundles, the limited knowledge of potential buyers is main reason for the modest adoption. The authors apply strategies derived from information economics to reduce this asymmetry by integrating information substitutes in the service marketplace description, thereby transforming experience and credence qualities into search qualities.}, language = {en} } @article{StantchevMalek2011, author = {Stantchev, Vladimir and Malek, Miroslaw}, title = {Addressing Dependability throughout the SOA Life Cycle}, series = {IEEE Transactions on Services Computing}, volume = {4}, journal = {IEEE Transactions on Services Computing}, number = {2}, pages = {85 -- 95}, year = {2011}, abstract = {Dependability should be considered throughout the phases of the SOA life cycle. This article proposes the application of a service level management approach to address dependability and presents dependability-related activities for every stage (Model, Assemble, Deploy, and Manage) of the SOA life cycle. Furthermore, we describe the concepts and the formalisms that are behind these activities. Following these activities service providers and aggregators can offer optimized levels of dependability from their existing services and thus better meet user requirements.}, language = {en} } @article{PetruchTammStantchev2012, author = {Petruch, Konstantin and Tamm, Gerrit and Stantchev, Vladimir}, title = {Deriving In-Depth Knowledge from IT-Performance Data Simulations}, series = {International Journal of Knowledge Society Research (IJKSR)}, volume = {3}, journal = {International Journal of Knowledge Society Research (IJKSR)}, number = {2}, pages = {13 -- 29}, year = {2012}, abstract = {Knowledge of behavioral patterns of a system can contribute to an optimized management and governance of the same system, or of similar systems. While human experience often manifests itself as intuition, intuition can be notoriously misleading, particularly in the case of quantitative data and subtle relations between different data sets. This article augments managerial intuition with knowledge derived from a specific byproduct of automated transaction processing performance and log data of the processing software. More specifically, the authors consider data generated by incident management and ticketing systems within IT support departments. The authors' approach utilizes a rigorous analysis methodology based on System Dynamics. This allows for identifying real causalities and hidden dependencies between different datasets. The authors can then use them to derive and assemble knowledge bases for improved management and governance in this context. This approach is able to provide more in depth insights as compared to typical data visualization and dashboard techniques. In the experimental results section, the authors demonstrate the feasibility of the approach. It is applied on real life datasets and log files from an international telecommunication provider and considered different improvements in management and governance that result from it.}, language = {en} } @article{StantchevStantcheva2012, author = {Stantchev, Vladimir and Stantcheva, Lubomira}, title = {Extending Traditional IT-Governance Knowledge Towards SOA and Cloud Governance}, series = {International Journal of Knowledge Society Research}, volume = {3}, journal = {International Journal of Knowledge Society Research}, number = {2}, pages = {30 -- 43}, year = {2012}, abstract = {Enterprises today often strive to keep up with the paces of technological development. A particular case in point is the IT function where traditional governance approaches are often questioned by technology trends. Examples for such trends in the last ten years are the service-oriented architecture (SOA) and cloud computing. The introduction of SOA in the enterprise was one of the key enablers for cloud computing. Therefore, it can serve as a natural fit for bringing traditional IT governance approaches forward to the challenges of cloud governance. This article presents an approach for extending IT governance mindsets to the areas of SOA and cloud governance. It allows an IT organisation the adaptation and the continuous usage of already established governance knowledge and models during the adoption of cloud computing solutions. The authors also present an application case study where they demonstrate the feasibility of the approach in real-life scenarios in the context of an international telecommunication provider.}, language = {en} } @article{PetruchStantchevTamm2011, author = {Petruch, Konstantin and Stantchev, Vladimir and Tamm, Gerrit}, title = {A Survey on IT-Governance Aspects of Cloud Computing}, series = {International Journal of Web and Grid Services}, volume = {7}, journal = {International Journal of Web and Grid Services}, number = {3}, pages = {268 -- 303}, year = {2011}, abstract = {The purpose of this work is to provide a representative survey of current trends in the perception, assessment and adoption of cloud computing within the enterprise. Cloud computing can be regarded as the general principle for using and providing web and grid services. First, we provide a meta-study, where we evaluate existing and published empirical studies. Furthermore, we conduct and evaluate an own empirical study with a representative group of European and International enterprises. Key findings of the work include the significantly higher importance of Business Drivers for the adoption of cloud computing, as compared to Technical Drivers.}, language = {en} } @incollection{StantchevTamm2011, author = {Stantchev, Vladimir and Tamm, Gerrit}, title = {Addressing Non-Functional Properties of Services in IT Service Management}, series = {Non-Functional Properties in Service Oriented Architecture: Requirements, Models and Methods}, booktitle = {Non-Functional Properties in Service Oriented Architecture: Requirements, Models and Methods}, publisher = {IGI Global}, address = {Hershey}, publisher = {SRH Berlin University of Applied Sciences}, pages = {324 -- 334}, year = {2011}, abstract = {A key point that remains to be addressed is the assurance of service levels for end-user applications that rely on these provider models. This chapter describes an approach for addressing non-functional properties (NFPs) of services in service-oriented architectures (SOA). The approach is based on reference models such as the IT Infrastructure Library (ITIL) and the SOA life cycle model. It has been applied in several industrial settings in the telecommunications sector.}, language = {en} } @incollection{StantchevTamm2010, author = {Stantchev, Vladimir and Tamm, Gerrit}, title = {Managing Research Portfolios in the Knowledge Enterprise: a University Spin-Out Case Study}, series = {Organizational, Business, and Technological Aspects of the Knowledge Society}, booktitle = {Organizational, Business, and Technological Aspects of the Knowledge Society}, editor = {Lytras, Miltiadis D.}, publisher = {Springer}, address = {Berlin}, publisher = {SRH Berlin University of Applied Sciences}, pages = {418 -- 423}, year = {2010}, abstract = {Purely knowledge-based activities are of an increasing importance for modern enterprises. Moreover, innovative companies are focusing entirely on such high-profile activities and outsourcing the supporting tasks. In this work we focus on university spin-outs as an example. Such companies often enjoy the provision of administrative infrastructure (e.g., accounting, facilities) within an "incubator" area and can focus exclusively on innovation. The transfer of research ideas to the marketplace typically involves selection and targeted prioritization of these ideas. Project Portfolio Management (PPM) can be a viable framework for this prioritization. The necessary structuring of project ideas can be provided by a standardized process with defined functions (data repository, project assessment, selection, reporting, and portfolio reevaluation). While PPM is generally regarded as beneficial for large organizations, we show that similar benefits can be expected within innovative SMEs. In this work we discuss such benefits and related knowledge and learning strategies.}, language = {en} } @article{StantchevTamm2012, author = {Stantchev, Vladimir and Tamm, Gerrit}, title = {Reducing Information Asymmetry in Cloud Marketplaces}, series = {International Journal of Human Capital and Information Technology Professionals}, volume = {3}, journal = {International Journal of Human Capital and Information Technology Professionals}, number = {4}, pages = {1 -- 11}, year = {2012}, abstract = {Cloud Computing is emerging as a predominant paradigm for obtaining and providing computing functionality in the enterprise. Organizations that are planning to use cloud computing offerings struggle with the question "How do I choose the right offering?" Cloud offerings exhibit a variety of pricing models and different levels of service and functionality. In this article the authors define first Cloud Computing in the context of IT Governance. Then they set criteria to compare different offerings at the level of Software-as-a-Service (SaaS). This is an important precondition for the reduction of the verifiable information asymmetry and uncertainty in the cloud market. Besides deficiencies on the supply side, regarding configuration, display and communication of service bundles, the limited knowledge of potential buyers is main reason for the modest adoption. The authors apply strategies derived from information economics to reduce this asymmetry by integrating information substitutes in the service marketplace description, thereby transforming experience and credence qualities into search qualities.}, language = {en} }