@inproceedings{PittkeLeopoldMendlingetal.2012, author = {Pittke, Fabian and Leopold, Henrik and Mendling, Jan and Tamm, Gerrit}, title = {Enabling Reuse of Process Models through the Detection of Similar Process Parts}, series = {Business Process Management Workshops}, booktitle = {Business Process Management Workshops}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-36284-2}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-40}, pages = {586 -- 597}, year = {2012}, abstract = {Many companies use business process modeling to support various improvements initiatives leading to an increasing number of process models. Typically, these models are stored in a collection containing several hundreds of process models. In many cases, process models are overlapping, although parts could be easily reused saving costs and efforts. Different labeling styles and evolving process models complicate the detec- tion of reusable model parts. In this paper, we propose a novel approach for the detection of equivalent and similar process model parts that ex- ploits semantic comparison of activity labels and behavioral comparison of control flow. We evaluate our approach on the SAP Reference Model, a collection with 604 process models. The evaluation reveals insights for the thresholds of semantic and behavioral similarity of process models as well as their influence for similar process part detection. Hence, we identify five candidate groups with specific similarity properties that contain reoccurring process parts.}, language = {en} } @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{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} } @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} } @inproceedings{MejiaGlasbergTammetal.2011, author = {Mejia, F. and Glasberg, Ronald and Tamm, Gerrit and Lopez, Gabriel J.}, title = {Readiness Level to adopt Smart Grid Technologies: Study for the City of Medellin}, isbn = {978-1-4577-1802-1}, year = {2011}, abstract = {The smart grid development in Latin America shows a big gap in the amount of research and development when compared with the USA and EU where the topic has been active for almost 10 years. In this context two different models and expert surveys are used in this study to evaluate the readiness level of the city of Medellin to adopt smart grid technologies. The results of this study show that the City has the utilities, the knowledge, the universities and the human resource to become a role model in the region. But an effort to integrate all the actors and impulse a common agenda is required. The utility companies need to lead this development, but regulators, academia and industry must back up this endeavor and enable Medellin to lead the power grid development of the next years in the region.}, 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{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{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{BochenekTamm2009, author = {Bochenek, Adam and Tamm, Gerrit}, title = {Social Media Marketing Services for Mobile Applications}, series = {Wireless Communication and Information: Radio Engineering and Multimedia Applications}, booktitle = {Wireless Communication and Information: Radio Engineering and Multimedia Applications}, editor = {Sieck, J{\"u}rgen}, publisher = {Verlag Werner H{\"u}lsbusch}, address = {Boizenburg}, publisher = {SRH Berlin University of Applied Sciences}, pages = {185 -- 202}, year = {2009}, abstract = {Keine Angabe No details}, language = {en} } @book{UlrichTamm2008, author = {Ulrich, Peter and Tamm, Gerrit}, title = {Corporate- und Webinterface Design f{\"u}r ein Online-Unternehmen: Analyse, Konzeption und Realisierung am Beispiel des Online-Jobportals absolvent.de}, publisher = {VDM Verlag Dr. M{\"u}ller}, address = {Saarbr{\"u}cken}, isbn = {978-3-639-04088-3}, publisher = {SRH Berlin University of Applied Sciences}, pages = {105}, year = {2008}, abstract = {Absolvent.de ist ein seit 1998 bestehendes Online-Jobportal, welches sich auf die Vermittlung von Jobs und Praktika f{\"u}r Hochschulabsolventen spezialisiert hat. Im Zuge eines bevorstehenden Relaunchs sollen neben den Funktionalit{\"a}ten und eingesetzten Technologien auch das Corporate Design und das Webinterface Design erneuert werden. Die Entwicklung von Corporate Design und Webinterface Design f{\"u}r absolvent.de ist Gegenstand dieser Arbeit. Dazu werden im theoretischen Teil der Arbeit objektive Anforderungen und Funktionen des Corporate Designs und des Webinterface Designs genannt und erl{\"a}utert. Im praktischen Teil werden am Beispiel des Online-Jobportals absolvent.de systematische Methoden f{\"u}r die Entwicklung eines den Anforderungen entsprechenden Corporate- und Webinterface Designs aufgezeigt und angewendet. Anhand des systematischen Vorgehens bei der Designentwicklung wird die schrittweise Verringerung der Komplexit{\"a}t der Aufgabenstellung deutlich und die entwickelten Ergebnisse werden plausibel und nachvollziehbar. Das Buch dient als Leitfaden bei der Entwicklung von Corporate Design und Webinterface Design und richtet sich somit an Grafik-, Web- und Interfacedesigner.}, language = {de} } @book{HebigTamm2008, author = {Hebig, Michael and Tamm, Gerrit}, title = {Web Mining: mit Kundenorientierung zum Gesch{\"a}ftserfolg}, publisher = {VDM Verlag Dr. M{\"u}ller}, address = {Saarbr{\"u}cken}, isbn = {978-3-639-07933-3}, publisher = {SRH Berlin University of Applied Sciences}, pages = {VII, 123, XV}, year = {2008}, abstract = {Das Buch „Web Mining - mit Kundenorientierung zum Gesch{\"a}ftserfolg" verschafft dem Leser einen Einblick in die Welt des Web Mining. In einem ersten Teil werden die Herkunft, der Prozess sowie die Grenzen des Web Mining detailiert erl{\"a}utert. Anhand eines praktischen Beispiels kommen nachfolgend Web Mining Tools zum Einsatz. So wird aufgezeigt, wie mit Hilfe von Auswertungen der Nutzerdaten Optimierungspotentiale entdeckt und wie daraus Handlungsempfehlungen abgeleitet werden k{\"o}nnen. Durch Anpassen der Websites an die zuvor gewonnenen Nutzerbed{\"u}rfnisse l{\"a}sst sich der Erfolg der Internetpr{\"a}senz erh{\"o}hen. Es wird also veranschaulicht dargestellt, welche M{\"o}glichkeiten z.B. Online-Shop-Betreiber besitzen, um den Umsatz des Unternehmens zu steigern.}, language = {de} } @phdthesis{Tamm2003, author = {Tamm, Gerrit}, title = {Netzbasierte Dienste: Angebot, Nachfrage und Matching}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-6398}, school = {SRH Berlin University of Applied Sciences}, pages = {323}, year = {2003}, abstract = {Die vorliegende Dissertation pr{\"a}sentiert eine umfassende Analyse und Strukturierung des Marktes f{\"u}r netzbasierte Dienste. Basierend auf einer detaillierten Untersuchung des ASP-Angebotes und der ASP-Nachfrage in Europa werden geeignete Institutionen und Informationssubstitute f{\"u}r die Anpassung (Matching) des ASP-Angebotes und der ASP-Nachfrage identifiziert und getestet. Die Strukturierung der Angebotsseite umfasst neben der Bewertung der Marktlage die Entwicklung der ASP-Wertsch{\"o}pfungskette, die Einordnung in die Systematik der digitalen G{\"u}ter, die Beschreibung der ASP-Technologien und -Gesch{\"a}ftsmodelle und den Vergleich des ASP-Gesch{\"a}ftsmodells mit der klassischen Softwarenutzung und dem Konzept der virtuellen Organisationen. Die Ergebnisse der Untersuchungen zeigen vorhandene Defizite in der Informations- und Kommunikationspolitik der ASP-Angebotsseite auf. F{\"u}r die Strukturierung der Nachfrageseite f{\"u}r netzbasierte Dienste werden die Theorien der Auslagerung (Outsourcing) von Informationstechnologien, die Methoden und Instrumente der Kosten- und Nutzenmessung und die Theorie der Transaktionsphasen der Auslagerung angewendet. Kern der wissenschaftlichen Untersuchung bildet die empirische Untersuchung des ASP-Nachfragemarktes in Deutschland und anderen europ{\"a}ischen L{\"a}ndern. Die Erkenntnisse der Analyse des ASP-Angebotes und der ASP-Nachfrage werden gegen{\"u}bergestellt und Methoden zur Abstimmung von ASP-Angebot und Nachfrage mit Hilfe der Transaktionskostentheorie und den Theorien der Informations- und Institutionen{\"o}konomie abgeleitet. Barrieren, Intransparenzen und Informationsasymmetrien werden auf beiden Seiten aufgezeigt und darauf aufbauend Informationssubstitute f{\"u}r netzbasierte Dienste identifiziert. Erfahrungs- und Vertrauenseigenschaften werden mit Hilfe von Informationssubstituten in einem Onlinebefragungsexperiment hinsichtlich der Wahrnehmung, Wirkung und m{\"o}glicher Zahlungsbereitschaften {\"u}berpr{\"u}ft. Aus den Ergebnissen des Onlinebefragungsexperimentes werden Anforderungen an die Informations- und Kommunikationspolitik und Strategien zur Reduzierung der Informationsasymmetrie f{\"u}r netzbasierte Dienste entwickelt. Das Ergebnis der Arbeit ist die Ableitung relevanter Kriterien f{\"u}r die Darstellung und Bewertung der Leistungsb{\"u}ndel netzbasierter Dienste und die Entwicklung von Strategien zur Reduzierung der Transaktionsunsicherheit durch die Identifizierung und Integration von Informationssubstituten f{\"u}r netzbasierte Dienste.}, language = {de} } @incollection{TammUllrich2012, author = {Tamm, Gerrit and Ullrich, Sebastian}, title = {Agile Software Architecture for Interactive Media Facades}, series = {Urban media cultures}, booktitle = {Urban media cultures}, editor = {Pop, Susa}, publisher = {avedition}, address = {Ludwigsburg}, publisher = {SRH Berlin University of Applied Sciences}, pages = {176 -- 179}, year = {2012}, abstract = {Keine Angabe No details}, language = {en} } @incollection{GerkePetruchTamm2010, author = {Gerke, Kerstin and Petruch, Konstantin and Tamm, Gerrit}, title = {Continual Process Improvement Based on ITIL and Process Mining}, series = {Quality Management for IT-Services}, booktitle = {Quality Management for IT-Services}, editor = {Praeg, Claus-Peter}, publisher = {IGI Global}, address = {Hershey}, publisher = {SRH Berlin University of Applied Sciences}, pages = {145 -- 167}, year = {2010}, abstract = {The inherent quality of business processes and their support through information technology (IT) increasingly plays a significant role in the economic success of an organization. More and more business processes are supported through IT services. In order to provide IT services with the required quality and at minimum costs, the importance of effective and efficient IT service management (ITSM) processes is crucial.}, 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} } @incollection{WinklerSchoendienstTamm2009, author = {Winkler, Till J. and Sch{\"o}ndienst, Valentin and Tamm, Gerrit}, title = {Wireless City Berlin: solutions for a Smarter City}, series = {Wireless Communication and Information}, booktitle = {Wireless Communication and Information}, editor = {Sieck, J{\"u}rgen}, publisher = {Verlag Werner H{\"u}lsbusch}, address = {Boizenburg}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-6441}, publisher = {SRH Berlin University of Applied Sciences}, pages = {207 -- 220}, year = {2009}, abstract = {Cities in Europe face the challenge of combining competitiveness and sustainable urban development. Technology such as wireless communication and ubiquitous computing is playing an increasingly important role in this context, helping to co-create solutions which can make the urban space „smarter‟. The city of Berlin is launching the project „Wireless City Berlin‟ (WCB) to demonstrate the potential of such technologies in multiple application scenarios. This paper analyses the terms „smart‟ and „wireless‟ with respect to urban development and introduces a typology of wireless city initiatives. Further, it presents the main work areas of the WCB project and relates it to other wireless city initiatives in Europe.}, language = {en} } @incollection{IbachMalekTamm2006, author = {Ibach, Peter K. and Malek, Miroslaw and Tamm, Gerrit}, title = {Towards a Global Real-Time Enterprise}, series = {Emerging Spatial Information Systems and Applications}, booktitle = {Emerging Spatial Information Systems and Applications}, editor = {Hilton, Brian N.}, publisher = {Idea Group Publishing}, address = {Hershey}, publisher = {SRH Berlin University of Applied Sciences}, pages = {271 -- 309}, year = {2006}, abstract = {Frictionless interoperation of business processes even across enterprise boundaries, complete up-to-date view of the overall status, and full remote control over the business parameters for individuals in charge - this is the holy grail of a "global real-time enterprise". Yet a vision, a number of enabling technologies brought us closer to accomplishing the challenges: Sensing the position of mobile objects and processes status, distributing the status information with "zero latency", discovering it according to specific demands across organisation boundaries, providing and securing uniform service-oriented access to all kinds of entities ranging from smart items to business processes, and aggregating the overwhelming variety of elementary services to form high-value composite services. In this chapter, we overview the enabling technologies that drive the development and further discuss market factors, security and privacy concerns, and standardization processes that have to be considered. Then we propose our SEMALON approach - the SEMAntic LOcation Network - intended as a basic infrastructure for discovery and composition of location based services. Finally we describe our experiences from a case study implementation - the NOMADS Campus - which is a distributed spatial information system for our campus at Humboldt University Berlin.}, language = {en} } @incollection{GuentherTamm2000, author = {G{\"u}nther, Oliver and Tamm, Gerrit}, title = {A Framework for ASP-Marketplaces}, series = {Cooperative Information Systems}, booktitle = {Cooperative Information Systems}, editor = {Scheuermann, Peter}, publisher = {Springer}, address = {Berlin}, publisher = {SRH Berlin University of Applied Sciences}, pages = {114 -- 119}, year = {2000}, abstract = {For organizations that plan to use online software applications via Internet one of the most important questions is, "How do you choose the right ASP for the companies corporate needs?". ASP marketplaces offer a plurality of pricing models and different levels of service. From whole system and whole service to single applications and methods, every digital product and service can be provided through an ASP marketplace. There is a need for ASP marketplaces, which gives the user a transparent insight into the ASP market. In this paper we define Application Service Providing in the context of Outsourcing. Then we analyze relevant software classes for ASP marketplaces. Finally we will set criteria to compare different levels of service of ASP marketplace. This paper gives an overview of key characteristics ASP marketplace provider must take into account by preparing the business process in order to successfully deliver application services.}, 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} } @inproceedings{TammWuensche2003, author = {Tamm, Gerrit and W{\"u}nsche, Maria}, title = {Strategies to reduce information asymmetry in Web Service Market}, series = {Proceedings of the Eleventh European Conference on Information Systems}, booktitle = {Proceedings of the Eleventh European Conference on Information Systems}, editor = {Ciborra, C. U. and Mercurio, R. and de Marco, M. and Martinez, M. and Carignani, A.}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-7034}, pages = {1898 -- 1912}, year = {2003}, abstract = {The web service model provides fundamental advantages compared to the classical software usage model. But transactions in the web service market have by far not reached the expected level. A reason for the tendency of market failure is the verifiable information asymmetry and uncertainty in the web service market. Besides deficiencies on the supply side, regarding configuration, display and communication of web service bundles, the limited web service knowledge of potential buyers are constitutional causes to the modest development and enforcement of the web service model. By the help of strategies derived from information economics the present study elaborates measures to take in order to prevent the market for web based services from failing. The conclusions of an online-based questioning experiment offer strategic recommendations to reduce buyer's uncertainty in outsourcing decision. Results of the experiment point out the significant positive impact to reduce information asymmetry and transaction uncertainty in the web service market by integrating information substitutes in the web service bundle in order to transform experience and credence qualities into search qualities. It can be verified that web service customers have a higher willingness to pay when information substitutes are integrated into the web service bundle.}, language = {en} } @inproceedings{TammGuenther2000, author = {Tamm, Gerrit and G{\"u}nther, Oliver}, title = {Business Models for ASP Marketplaces}, series = {Proceedings of the Eighth European Conference on Information Systems}, booktitle = {Proceedings of the Eighth European Conference on Information Systems}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-7046}, pages = {968 -- 975}, year = {2000}, abstract = {Abstract: ASP (Application Server Provider) marketplaces provide a fundamental alternative to the classical business model of software licensing. At this point, it is still unclear why and when customers prefer the ASP model over more traditional approaches. To make ASP more attractive, more knowledge about possible pricing and product strategies is needed. In this paper we describe different business models for ASP marketplaces. We first compare the cost structures of the classical licensing model with the new server-based approach. Then we illustrate how price and product differentiation may improve overall market efficiency. In particular, we show that by selling different software versions for different prices, ASP marketplaces may obtain near-optimal revenues with products that are relatively inexpensive, disaggregated, and customizable. Consumers can thus choose between a wide variety of product lines to fit their differing budgets and requirements.}, language = {en} } @article{PrietoGonzalezColomoPalaciosPuertaetal.2014, author = {Prieto-Gonz{\´a}lez, Lisardo and Colomo-Palacios, Ricardo and Puerta, Beatriz and Tamm, Gerrit}, title = {ModEAS: towards A Modular Enterprise App Store}, series = {International Journal of Human Capital and Information Technology Professionals}, volume = {5}, journal = {International Journal of Human Capital and Information Technology Professionals}, number = {2}, pages = {52 -- 61}, year = {2014}, abstract = {Mobile technologies and more precisely apps have disrupted technology scenario. Bring your own application (BYOA) is a new trend that has emerged after the "bring your own device" (BYOD) vogue. However, and in spite of its intrinsic benefits, the trend presents also several caveats and Enterprise app stores are seen as a way to tackle these risks. In this paper, authors present ModEAS, a system designed to serve as a modular and scalable architecture when developing a middle scale or personal Enterprise app store.}, language = {en} } @article{StantchevBarnawiGhulametal.2014, author = {Stantchev, Vladimir and Barnawi, Ahmed and Ghulam, Sarfaraz and Schubert, Johannes and Tamm, Gerrit}, title = {Smart Items, Fog and Cloud Computing as Enablers of Servitization in Healthcare}, series = {Sensors \& Transducers}, volume = {185}, journal = {Sensors \& Transducers}, number = {2}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-7184}, pages = {121 -- 128}, year = {2014}, abstract = {In this article we argue that smart items and cloud computing can be powerful enablers of servitization as business trend. This is exemplified by an application scenario in healthcare that was developed in the context of the OpSIT-Project in Germany. We present a three-level architecture for a smart healthcare infrastructure. The approach is based on a service-oriented architecture and extends established architectural approaches developed previously at our group. More specifically, it integrates a role model, a layered cloud computing architecture, as well as a fog-computing-informed paradigm in order to provide a viable architecture for healthcare and elderly-care applications. The integration of established paradigms is beneficial with respect to providing adequate quality of service and governance (e.g., data privacy and compliance). It has been verified by expert interviews with healthcare specialists and IT professionals. To further demonstrate the validity of this architectural model, we provide an example use-case as a template for any kind of smart sensor-based healthcare infrastructure.}, language = {en} } @article{StantchevPrietoGonzalezTamm2014, author = {Stantchev, Vladimir and Prieto Gonz{\´a}lez, Lisardo and Tamm, Gerrit}, title = {Cloud computing service for knowledge assessment and studies recommendation in crowdsourcing and collaborative learning environments based on social network analysis}, series = {Computers in Human Behavior}, volume = {51}, journal = {Computers in Human Behavior}, pages = {762 -- 770}, year = {2014}, abstract = {Interactions among people have substantially changed since the emergence of social networks, the expansion of the Internet and the proliferation of connected mobile devices, and so have the possibilities of collaborative learning, with the inclusion of new e-learning platforms. From this point, assessing human knowledge in these virtual environments is not a trivial task. This work presents a novel cloud-computing-based service which relies on advanced artificial intelligence mechanisms to infer knowledge and interest from users considering the aggregated data presented from/to these users in different social networks. This way it is possible to assess with a certain degree of confidence the user knowledge level in different topics as well as recommend additional specific education related to his/her former studies in order to get a better/desired job.}, language = {en} } @article{SchermulyDraheimGlasbergetal.2015, author = {Schermuly, Carsten C. and Draheim, Michael and Glasberg, Ronald and Stantchev, Vladimir and Tamm, Gerrit and Hartmann, Michael and Hessel, Franz}, title = {Human resource crises in German hospitals: an explorative study}, series = {Human Resources for Health}, volume = {40}, journal = {Human Resources for Health}, number = {13}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-7288}, pages = {10}, year = {2015}, abstract = {The complexity of providing medical care in a high-tech environment with a highly specialized, limited labour force makes hospitals more crisis-prone than other industries. An effective defence against crises is only possible if the organizational resilience and the capacity to handle crises become part of the hospitals' organizational culture. To become more resilient to crises, a raised awareness — especially in the area of human resource (HR) — is necessary. The aim of this paper is to contribute to the process robustness against crises through the identification and evaluation of relevant HR crises and their causations in hospitals. Qualitative and quantitative methods were combined to identify and evaluate crises in hospitals in the HR sector. A structured workshop with experts was conducted to identify HR crises and their descriptions, as well as causes and consequences for patients and hospitals. To evaluate the findings, an online survey was carried out to rate the occurrence (past, future) and dangerousness of each crisis. Six HR crises were identified in this study: staff shortages, acute loss of personnel following a pandemic, damage to reputation, insufficient communication during restructuring, bullying, and misuse of drugs. The highest occurrence probability in the future was seen in staff shortages, followed by acute loss of personnel following a pandemic. Staff shortages, damage to reputation, and acute loss of personnel following a pandemic were seen as the most dangerous crises. The study concludes that coping with HR crises in hospitals is existential for hospitals and requires increased awareness. The six HR crises identified occurred regularly in German hospitals in the past, and their occurrence probability for the future was rated as high.}, language = {en} } @article{GerkeTamm2009, author = {Gerke, Kerstin and Tamm, Gerrit}, title = {Qualit{\"a}tsmanagement zur Steuerung von IT-Prozessen auf der Basis von Referenzmodellen und Process Mining}, series = {HMD Praxis der Wirtschaftsinformatik}, volume = {46}, journal = {HMD Praxis der Wirtschaftsinformatik}, number = {2}, pages = {43 -- 51}, year = {2009}, abstract = {Die Qualit{\"a}t von Gesch{\"a}ftsprozessen entscheidet zunehmend {\"u}ber den wirtschaftlichen Erfolg eines Unternehmens. Die Gesch{\"a}ftsprozesse werden immer st{\"a}rker durch IT-Prozesse unterst{\"u}tzt. Der Beitrag zeigt, wie die IT-Prozesse auf der Grundlage des Referenzmodells IT Infrastructure Library (ITIL) optimiert und mithilfe von Kennzahlen und Process Mining gesteuert werden k{\"o}nnen. Hierf{\"u}r werden auf Basis der Referenzprozesse Sollprozesse bestimmt und Sollkennzahlen festgelegt. Die Istprozesse und deren Kennzahlen werden mithilfe von Process Mining ausgewertet und anschließend mit den Sollprozessen verglichen. Insgesamt k{\"o}nnen Verbesserungspotenziale identifiziert und Handlungsempfehlungen abgeleitet werden. Die Gestaltung und Steuerung ITIL-basierter Customer-Support-Prozesse werden anhand eines Praxisfalles aus einem Customer-Relationship-Management-System erprobt. Vorgehensmodell und Ergebnisse werden in diesem Beitrag vorgestellt.}, language = {de} } @article{GerkeTamm2008, author = {Gerke, Kerstin and Tamm, Gerrit}, title = {Process mining and data aggregation strategies for business collaboration networks}, series = {Journal Communications of Arab Computer Society}, volume = {1}, journal = {Journal Communications of Arab Computer Society}, number = {1}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-6490}, pages = {10}, year = {2008}, abstract = {Business collaboration and information sharing becomes more and more important for companies, mainly driven by economics of scale and the strategic value of network knowledge. In this paper we will describe how process mining results will increase the willingness of cross company data aggregation and the usage of shared business collaboration infrastructures. The results of our contributions are based on process and data analyses in the customer relation management of a leading German passenger airline. As information sharing is considered a central challenge among supply chain partners, we describe the role of data aggregation as a requirement for process mining in collaborative infrastructures. Aggregating data on the one hand can preserve companies from compromising their local data. On the other hand valuable network information may get lost. We use process mining to derive collaborative business process models. Therefore, we evaluate the impact of data aggregation on the significance of process mining results.}, language = {en} } @article{TammPetruchBennemann2008, author = {Tamm, Gerrit and Petruch, Konstantin and Bennemann, Michael}, title = {SaaS - Software as a Service: Herausforderungen f{\"u}r IT-Abteilungen}, series = {Journal IM Information Management}, volume = {23}, journal = {Journal IM Information Management}, number = {4}, pages = {12 -- 18}, year = {2008}, abstract = {Das SaaS-Gesch{\"a}ftsmodell stellt IT-Abteilungen vor neue Herausforderungen und M{\"o}glichkeiten. IT-Abteilungen sind gefordert SaaS-Angebote in bestehende IT-Landschaften zu integrieren. Zudem k{\"o}nnen IT-Abteilungen selbst SaaS-Angebot bereitstellen und sich damit einen neuen Markt unternehmensintern und unternehmens{\"u}bergreifend erschließen. GobiT und ITIL k{\"o}nnen f{\"u}r die Steuerung des SaaS-Lieferanten- und Kundenbeziehungsmanagement und f{\"u}r die SaaS-Produktion sinnvoll eingesetzt werden.}, language = {de} } @article{GuentherTammLeymann2007, author = {G{\"u}nther, Oliver and Tamm, Gerrit and Leymann, Frank}, title = {Pricing web services}, series = {International Journal of Business Process Integration and Management (IJBPIM)}, volume = {2}, journal = {International Journal of Business Process Integration and Management (IJBPIM)}, number = {2}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-6511}, pages = {132 -- 140}, year = {2007}, abstract = {This paper focuses on the challenges associated with composing and pricing web services. We present the results of an online experiment, where subjects were confronted with a variety of choices and decisions relating to web service markets and service composition. Our analysis shows that people expect the price of a composite web service to be lower than the sum of the prices of the elementary services, that is, users are not willing to pay for aggregation by a third party. To obtain a viable business model for composite web services, non-standard pricing mechanisms, such as auctions and negotiations, possibly supported by electronic agents, have to be taken into consideration. Usage-based pricing schemes, combined with an option to switch to a flat subscription, seem most appropriate to penetrate the developing market for web services.}, language = {en} } @article{GuentherTammHansenetal.2001, author = {G{\"u}nther, Oliver and Tamm, Gerrit and Hansen, Lars and Meseg, Thomas}, title = {Application Service Providers: Angebot, Nachfrage und langfristige Perspektiven}, series = {Fachzeitschrift Wirtschaftsinformatik}, volume = {43}, journal = {Fachzeitschrift Wirtschaftsinformatik}, number = {6}, pages = {555 -- 567}, year = {2001}, abstract = {Netzbasierte Dienste, im englischen Sprachraum als Web-based Services oder Hosted Services bekannt, gewinnen zunehmend an Popularit{\"a}t. Zahlreiche Softwareanbieter pr{\"a}sentieren sich am Markt als Application Service Provider (ASP), d.h. als Anbieter netzbasierter Anwendungsdienste. Hierbei kann das ASP-Modell den einzigen Vertriebskanal darstellen (reiner ASP) oder aber als Erg{\"a}nzung neben das klassische Lizenzmodell treten. W{\"a}hrend junge Firmen (wie z. B. Salesforce.com) ihr Gl{\"u}ck als reiner ASP versuchen, w{\"a}hlen etablierte Anbieter im Regelfall die zuletzt genannte Option SAP mit seinem ASP-Produkt mySAP.com ist hierf{\"u}r eines der bekannteren Beispiele.}, language = {de} } @inproceedings{GerkePetruchTamm2010, author = {Gerke, Kerstin and Petruch, Konstantin and Tamm, Gerrit}, title = {Optimization of Service Delivery through Continual Process Improvement: a Case Study}, series = {40. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI), Leipzig}, booktitle = {40. Jahrestagung der Gesellschaft f{\"u}r Informatik e.V. (GI), Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-6537}, year = {2010}, abstract = {In order to deliver services of high quality in a cost-effective manner, processes and their support through information technology (IT) play an increasingly significant role. We present an approach, which allows optimizing the service delivery through continual process improvement. This approach combines the 7-step improvement process recommended by ITIL with process mining. On the basis of suggestions derived from process mining, performance indicators of different services are determined and subsequently compared as part of an internal benchmark. The approach, which will be trialed in practice, enables the optimization of service delivery certainly, but it is also concerned with the most effective utilization of limited resources in terms of people and tools.}, language = {en} } @inproceedings{StantchevTamm2010, author = {Stantchev, Vladimir and Tamm, Gerrit}, title = {SOA Governance for the Internet of Services}, series = {18th Biennial Conference of the International Telecommunications Society, Tokio}, booktitle = {18th Biennial Conference of the International Telecommunications Society, Tokio}, year = {2010}, abstract = {Keine Angabe No details}, language = {en} } @inproceedings{GerkeTamm2009, author = {Gerke, Kerstin and Tamm, Gerrit}, title = {Continuous Quality Improvement of IT Processes based on Reference Models and Process Mining}, series = {15th Americas Conference on Information Systems (AMCIS'09), San Francisco}, booktitle = {15th Americas Conference on Information Systems (AMCIS'09), San Francisco}, year = {2009}, abstract = {The inherent quality of business processes increasingly plays a significant role in the economic success of an organization. More and more business processes are supported through IT processes. In this contribution, we present a new approach which allows the continuous quality improvement of IT processes by the interconnection of IT Infrastructure Library (ITIL) reference model and process mining. On the basis of the reference model, to-be processes are set and key indicators are determined. As-is processes and their key indicators derived by process mining are subsequently compared to the to-be processes. This new approach enables the design and control of ITIL based customer support processes which will be trialed in a practice case of a customer relationship management (CRM) system. The procedural models, as well as its results, are introduced in this publication.}, language = {en} } @inproceedings{SchlegelTamm2009, author = {Schlegel, Martin and Tamm, Gerrit}, title = {Online Service Quality of Web-based E-Mail-Services: an Empirical Study for The German Market}, series = {42th Hawaii International Conference on System Science (HICSS-42), Hawaii}, booktitle = {42th Hawaii International Conference on System Science (HICSS-42), Hawaii}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-6566}, pages = {1 -- 10}, year = {2009}, abstract = {E-mail services represent an essential part of the IT landscape of enterprises. Besides in-house hosting, every company can make use of offers from specialized Application Service Providers (ASPs). Former research has shown a lack of transparency in the market for web-based services. This paper summarizes the results of a study on professional web-based e-mail services catering to the German-speaking market. This research mainly addresses following questions: What are the similarities and differences between the various services in the market? To which extent do the offered services meet a corporation's requirements? What kind of methodology can be used to analyze and to compare web-based services? And, with that in mind, do web-based e-mail-services represent a serious alternative to in-house hosting of e-mail-services? To answer these questions we compared information of selected service providers on the basis of a multi-scenario utility analysis.}, language = {en} } @inproceedings{WinklerKorolevaTamm2009, author = {Winkler, Till J. and Koroleva, Ksenia and Tamm, Gerrit}, title = {Wireless City Initiatives in Europe: towards a Service-Oriented Approach}, series = {2009 Conference on Techniques and Applications for Mobile Commerce, M{\´e}rida (Spain)}, booktitle = {2009 Conference on Techniques and Applications for Mobile Commerce, M{\´e}rida (Spain)}, pages = {36 -- 47}, year = {2009}, abstract = {The application of wireless technologies in urban areas is at the beginning of a transformation. While municipalities worldwide have invested in deploying wireless access infrastructures, the services which build up on these and add value for individuals and organizations are still at their early stage. Especially for European municipalities there is still a looming potential. This paper explores the current status of municipal wireless adoption in Europe based on the analysis of 25 initiatives in European metropolitan areas and derives a setup approach for wireless city initiatives which focuses on the definition and evaluation of innovative services. The approach includes overall design requirements, a generic stakeholder analysis as well as clusters for innovative wireless services and is illustrated by a case example of an ongoing wireless city project in Germany.}, language = {en} } @inproceedings{HamannTammKaempfer2013, author = {Hamann, Lisa and Tamm, Gerrit and K{\"a}mpfer, Sascha}, title = {Analysis and comparison of existing maturity models for business processes}, series = {IADIS e-Society 2013 Conference, Lisbon}, booktitle = {IADIS e-Society 2013 Conference, Lisbon}, year = {2013}, abstract = {The continuous optimization of business processes is becoming an increasingly important factor for a company's long-term success. Maturity models for business processes aim at maintaining a distinct quality of processes and help to determine the maturity level of the processes and the company's maturity. Previous research has shown the lack of transparency and standardization for maturity models. In particular, existing maturity models were not scientifically compared and evaluated among themselves. Uncertainty and unawareness in selection and application of adequate maturity models can be observed in applied science and practice. The aim of the scientific work was to evaluate existing business process maturity models in terms of strengths and weaknesses in order to provide a comprehensive and reliable knowledge-based on specific evaluation criteria setting. The conclusions have been used to take advantage of one of the pre-chosen models to measure the maturity of a business process. The examined models were CMMI, BPMM-OMG, PEMM and EDEN. The applied methodology consists of literature research, empirical findings and practical application. The empirical findings comprise a purpose-made questionnaire and an outcome weighted in terms of importance and / or appliance. A particular challenge of the research was to compare the different maturity models based on their criteria, scales and general scope.}, language = {en} } @book{TammTribowski2010, author = {Tamm, Gerrit and Tribowski, Christoph}, title = {RFID}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-11459-5}, publisher = {SRH Berlin University of Applied Sciences}, pages = {XV, 144}, year = {2010}, abstract = {RFID bietet Unternehmen eine Vielzahl von Vorteilen im Bereich der Automatisierung und Prozesstransparenz. Gleichzeitig stellt die Technologie die Unternehmen vor technische, organisatorische, {\"o}konomische, rechtliche und sozio{\"o}konomische Herausforderungen. In diesem Buch werden die grundlegenden Funktionen der RFID-Technologie und L{\"o}sungskonzepte zur Integration in die betrieblichen Informationssysteme vorgestellt. Insbesondere die Standards des Internet der Dinge' werden maßgeblich den Erfolg der RFID-Technologie beeinflussen. F{\"u}r die RFID-Einf{\"u}hrung in Unternehmen wird in diesem Buch ein methodisch fundiertes Vorgehensmodell pr{\"a}sentiert. Die w{\"a}hrend des Vorgehensmodells eingesetzten Entscheidungsmethoden zur Potential- und Wirtschaftlichkeitsanalyse werden ausf{\"u}hrlich beschrieben und es wird auf unterst{\"u}tzende Softwarewerkzeuge verwiesen.}, language = {de} } @book{TammGuenther2005, author = {Tamm, Gerrit and G{\"u}nther, Oliver}, title = {Webbasierte Dienste: Technologien, M{\"a}rkte und Gesch{\"a}ftsmodelle}, publisher = {Physica-Verlag}, address = {Heidelberg}, isbn = {3-7908-1566-7}, publisher = {SRH Berlin University of Applied Sciences}, pages = {XVII, 258}, year = {2005}, abstract = {Dienstbasierte Architekturen bilden zunehmend eine attraktive Erg{\"a}nzung zu den klassischen Gesch{\"a}ftsmodellen der Softwarenutzung. Das Buch erl{\"a}utert die f{\"u}r webbasierte Dienste relevanten technischen und {\"o}konomischen Konzepte. Anschließend werden unter Zuhilfenahme von empirischen Analysen und Experimenten aktuelle Markttrends und Marktprozesse beschrieben. Dabei gehen die Autoren auch auf die aus dem Konsumg{\"u}terbereich bekannten Vertrauensprobleme und Informationsasymmetrien ein und er{\"o}rtern deren Konsequenzen f{\"u}r den Entwurf von erfolgreichen Gesch{\"a}ftsmodellen und M{\"a}rkten. Einschl{\"a}gige Fallstudien erg{\"a}nzen die Darstellung.}, language = {de} } @book{Tamm2003, author = {Tamm, Gerrit}, title = {Konzepte in eCommerce-Anwendungen}, publisher = {SPC TEIA Lehrbuch-Verlag}, address = {Berlin}, isbn = {3-935539-66-5}, publisher = {SRH Berlin University of Applied Sciences}, pages = {551}, year = {2003}, abstract = {Mit diesem Buch erhalten Sie ein umfassendes Grundlagenwissen zum Thema eCommerce-Anwendungen. Nachdem ein detaillierter {\"U}berblick {\"u}ber die Gesch{\"a}ftsmodelle des E-Shop-Marktes, die wesentlichen Aspekte zum Kaufverhalten im Internet und die daraus resultierenden Anforderungen an die Gestaltung eines E-Shops gegeben wird, werden die Entscheidungskriterien f{\"u}r die Auswahl eines geeigneten Shopsystems erarbeitet. Dieses Lehrbuch vermittelt die hierf{\"u}r notwendigen Kenntnisse {\"u}ber das World Wide Web, E-Shopsysteme und deren technische Anforderungen, liefert eine Einf{\"u}hrung zum Online-Marketing und zur Kundenbindung und informiert {\"u}ber wichtige Aspekte zum Thema Sicherheit im elektronischen Gesch{\"a}ftsverkehr sowie des Internet-Rechts. Es soll den Leser bef{\"a}higen, Kriterien f{\"u}r die Eignung eines Shopsystems f{\"u}r einen bestimmten Anwendungszweck zu erarbeiten, diese exemplarisch auf ausgew{\"a}hlte E-Shop-Modelle anzuwenden und den Aufbau eines E-Shops konzeptionell zu planen.}, language = {de} } @book{Tamm2003, author = {Tamm, Gerrit}, title = {Mittelstands-Shop-Systeme: OPENSTORE \& GS ShopBuilder Pro}, publisher = {SPC-TEIA-Lehrbuch-Verlag}, address = {Berlin}, isbn = {3-935539-71-1}, publisher = {SRH Berlin University of Applied Sciences}, pages = {553}, year = {2003}, abstract = {Das Internet spielt als Beschaffungs- und Informationsmedium eine immer gr{\"o}ßere Rolle. Vor allem konsumorientierte Unternehmen kommen an der virtuellen Dependance kaum noch vorbei. Das universit{\"a}re Lehrbuch Mittelstands-Shopsysteme: OPENSTORE Shopbuilder Pro begleitet mittelst{\"a}ndische Unternehmen bei der Webshoper{\"o}ffnung. Schwerpunkt des Lehrbuchs ist die technische Umsetzung vorhandener Webshopkonzepte. Zun{\"a}chst analysiert Autor Gerrit Tamm die g{\"a}ngigen Prozesse eines Webshopsystems. Die Umsetzung der Abl{\"a}ufe wird anschließend am Beispiel der Mittelstandsl{\"o}sungen OPENSTORE und Shopbuilder Pro erl{\"a}utert. Ausf{\"u}hrliche Anleitungen beschreiben wichtige Aspekte wie Serverinstallation, die Integration von Datenbanken und Warenwirtschaftssystemen oder die Abbildung von Bezahl- und Sicherheitsverfahren. Von hohem Stellenwert sind dabei vor allem spezielle Funktionen wie Warenk{\"o}rbe, Produktsuche oder standardisierte Webformulare. Details zu Seitengestaltung oder der Einrichtung automatischer E-Mail-Antworten erm{\"o}glichen eine individuelle Ausrichtung der Internetfiliale. Eine besondere Rolle spielt der laufende Betrieb. Zahlreiche Tipps und Tricks zeigen, wie sich bei Synchronisation, Upload oder Datensicherung Zeit und Geld sparen l{\"a}sst. Nach Lekt{\"u}re des Lehrbuchs ist der geneigte Leser in der Lage, Rahmenbedingungen zu analysieren, Anforderungen an den Webshop zu definieren, die richtige Software auszuw{\"a}hlen und das Projekt letztlich umzusetzen. {\"U}bungsaufgaben am Ende jedes Kapitels vertiefen das erlernte Wissen. Zusammenfassungen und zahlreiche Querverweise erm{\"o}glichen eine intuitive Einarbeitung in den Lehrstoff.}, language = {de} } @inproceedings{IbachTammHorbank2005, author = {Ibach, Peter and Tamm, Gerrit and Horbank, Matthias}, title = {Dynamic Value Webs in Mobile Environments Using Adaptive Location-Based Services}, series = {38th Hawaii International Conference on System Sciences (HICSS-38 2005), Hawaii}, booktitle = {38th Hawaii International Conference on System Sciences (HICSS-38 2005), Hawaii}, year = {2005}, abstract = {Web Services appear promising to facilitate interoperability and enable Dynamic Value Webs - the on-demand aggregation of services even across enterprise boundaries. However, past experiences have shown interoperability limitations in practice mainly due to information asymmetries on the Web Services markets. This Paper describes a service-oriented architecture for building Dynamic Value Webs in mobile environments using adaptive Location-Based Services. Our concept addresses the following three predominant difficulties: (1) service adaptivity to changing conditions in mobile environments, (2) interoperability including higher levels of semantics, and (3) assuring trustworthiness to all affected parties.}, language = {en} } @inproceedings{HochsteinTammBrenner2005, author = {Hochstein, Axel and Tamm, Gerrit and Brenner, Walter}, title = {Service-oriented IT-Management: benefit, Cost and Success Factors}, series = {13th European Conference on Information Systems (ECIS 2005), Regensburg}, booktitle = {13th European Conference on Information Systems (ECIS 2005), Regensburg}, year = {2005}, abstract = {Due to an enhanced customer focus in the planning, development and delivery of IT services, service-oriented IT management has become increasingly important. This paper investigates to what effect service-oriented IT management has already been put into place in European companies. Benefit and cost categories of integrating service-oriented principles into IT management processes are analyzed. Additionally success factors for implementing serviceoriented IT management are investigated. For this purpose, six case studies were conducted. The situation of IT management before and after implementation was analyzed and comments are made on the corresponding transformation projects. Based on the case studies, this paper shows three typical benefit categories of service-oriented IT management. Eight cost categories for implementing and operating service-oriented IT management processes are discussed and six success factors of pertinent re-organization projects are identified. Findings can serve as guidelines for other IT organizations and can be used as enabler for getting informed decisions regarding the initiation of service-oriented IT management. Finally, the article highlights four current trends for service-oriented IT management and further research is outlined.}, language = {en} } @inproceedings{TammZarnekow2005, author = {Tamm, Gerrit and Zarnekow, R{\"u}diger}, title = {Umsetzung eines ITIL-konformen IT-Service-Support auf der Grundlage von Web-Services}, series = {7. Internationale Tagung Wirtschaftsinformatik, Bamberg}, booktitle = {7. Internationale Tagung Wirtschaftsinformatik, Bamberg}, year = {2005}, abstract = {Die Umsetzung von IT-Service-Support-Prozessen auf der Basis des Referenzmodells IT Infrastructure Library (ITIL) geschieht in vielen Unternehmen derzeit mit hoher Priorit{\"a}t. Obwohl zur Unterst{\"u}tzung der Support-Prozesse eine Vielzahl von Softwarel{\"o}sungen zur Verf{\"u}gung stehen, basieren diese heute nicht auf Service-orientierten-Architekturen. Die Vorteile einer Service-orientierten-Architektur werden daher im Rahmen des IT-Service-Supports nicht genutzt. Der Beitrag zeigt am Beispiel eines zentralen ITIL-Support-Prozesses, dem Incident-Management, wie dieser technisch auf der Basis von Web-Services umgesetzt werden kann. Die Grundlage bilden sechs Fallstudien, in denen die Gestaltung ITIL-basierter Support-Prozesse untersucht wurde. Aufbauend auf den Fallstudien wird ein generischer Incident-Management-Prozess definiert und mit Hilfe von Web-Services umgesetzt. Dabei kommen sowohl atomare als auch aggregierte Web-Services zum Einsatz. F{\"u}r ein konkretes Service-Anliegen wird der Prozessablauf grafisch beschrieben. Die Umsetzung erfolgt exemplarisch unter Zuhilfenahme der Web Services Description Language (WSDL).}, language = {de} } @article{TammBrennerGrueneich2005, author = {Tamm, Gerrit and Brenner, Walter and Gr{\"u}neich, Armin}, title = {Business-Service-Management: Kulturwandel in der IT-Branche}, series = {Thexis: Fachzeitschrift f{\"u}r Marketing}, volume = {22}, journal = {Thexis: Fachzeitschrift f{\"u}r Marketing}, number = {2}, pages = {35 -- 40}, year = {2005}, abstract = {Keine Angabe No details}, language = {de} } @inproceedings{GhulamSchubertTammetal.2014, author = {Ghulam, Sarfaraz and Schubert, Johannes and Tamm, Gerrit and Stantchev, Vladimir}, title = {Integrating Smart Items and Cloud Computing in Healthcare Scenarios}, pages = {7}, year = {2014}, abstract = {Use of cloud computing in healthcare is a promising trend, particularly in utilization of smart items. Access, affordability and quality to proper healthcare is a great challenge in world society. With the utilization of smart sensors, there are possibilities to improve the quality of healthcare services whenever needed. Hence, such smart items services lead to economic advantages for the whole healthcare system. Keeping in mind these opportunities as well as challenges such as security or legal issues, it is important to bring healthcare and IT together. As a result, healthcare business processes need to be modeled in order to provide IT solutions tailored for practice-oriented applications. In this paper, we present a three-level architecture for a smart healthcare infrastructure. Our approach is based on recent literature work and results from conducted expert interviews with healthcare specialists and IT professionals. To demonstrate the applicability of this architecture model, we provide an example use-case as a template for any kind of smart sensor-based healthcare infrastructure.}, language = {en} } @article{SchermulyDraheimFlessaetal.2014, author = {Schermuly, Carsten C. and Draheim, Michael and Flessa, Steffen and Glasberg, Ronald and Stantchev, Vladimir and Tamm, Gerrit and Hartmann, Michael and Hessel, Franz}, title = {Management of Crises and Risks in German Hospitals: Factors Influencing Medication Errors}, series = {Value in Health}, volume = {17}, journal = {Value in Health}, number = {7}, pages = {A426}, year = {2014}, abstract = {In German hospitals there is a need for optimized crisis- and risk management. About one third of all hospital-acquired patient damages are due to medication errors. The aim of our interdisciplinary project "Risk Management in Hospitals" is to analyze the behavior of the various key players in the fields of medical care, human resources, supply and IT-systems in the context of various simulated risk scenarios as well as to develop adequate risk management tools. In this abstract, the first Results on medication errors are presented.}, language = {en} } @article{StantchevPrietoGonzalezTamm2015, author = {Stantchev, Vladimir and Prieto-Gonz{\´a}lez, Lisardo and Tamm, Gerrit}, title = {Cloud computing service for knowledge assessment and studies recommendation in crowdsourcing and collaborative learning environments based on social network analysis}, series = {Computers in Human Behavior}, volume = {51}, journal = {Computers in Human Behavior}, number = {B}, pages = {762 -- 770}, year = {2015}, abstract = {Interactions among people have substantially changed since the emergence of social networks, the expansion of the Internet and the proliferation of connected mobile devices, and so have the possibilities of collaborative learning, with the inclusion of new e-learning platforms. From this point, assessing human knowledge in these virtual environments is not a trivial task. This work presents a novel cloud-computing-based service which relies on advanced artificial intelligence mechanisms to infer knowledge and interest from users considering the aggregated data presented from/to these users in different social networks. This way it is possible to assess with a certain degree of confidence the user knowledge level in different topics as well as recommend additional specific education related to his/her former studies in order to get a better/desired job.}, language = {en} } @article{GlasbergHartmannDraheimetal.2014, author = {Glasberg, Ronald and Hartmann, Michael and Draheim, Michael and Tamm, Gerrit and Hessel, Franz}, title = {Risks and Crises for Healthcare Providers: the Impact of Cloud Computing}, series = {The Scientific World Journal}, journal = {The Scientific World Journal}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-9695}, year = {2014}, abstract = {We analyze risks and crises for healthcare providers and discuss the impact of cloud computing in such scenarios. The analysis is conducted in a holistic way, taking into account organizational and human aspects, clinical, IT-related, and utilities-related risks as well as incorporating the view of the overall risk management.}, language = {en} } @inproceedings{TammZiekow2004, author = {Tamm, Gerrit and Ziekow, Holger}, title = {The utility of learning management systems for institutes of higher education}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-10503}, pages = {12}, year = {2004}, abstract = {Nowadays efficiency and quality of education is controversially discussed by politicians as well as by scientists. A number of important studies point out the necessity of improvements in the field of education. Using learning management systems might be a chance for institutes of higher education to face the demands of today. In this paper we evaluate the need of learning management systems for higher education organisations. A value chain for organisations of higher education has been developed to categorize and to describe generic task. By conducting an empirical analysis through the academic task carriers (professors, students and administration department) we could identify the need for supporting each task by learning management system. The paper aims to describe a generic evaluation method for learning management systems. A comprehensive description of the evaluation method and results of the empirical analysis are presented in detail.}, language = {en} } @inproceedings{GhulammMuhammadSalimiJaedickeetal.2015, author = {Ghulamm Muhammad, Sarfaraz and Salimi, Meysam and Jaedicke, Corvin and Stantchev, Vladimir and Prieto-Gonz{\´a}lez, Lisardo and Tamm, Gerrit}, title = {Cloud Computing: an Enabler in the Modern Labour Market}, series = {Labour in the 21st Century}, booktitle = {Labour in the 21st Century}, publisher = {Cambridge Scholars Publishing}, address = {Newcastle upon Tyne}, isbn = {978-1-4438-1707-3}, pages = {66 -- 77}, year = {2015}, abstract = {Modern day labour market is influenced by different factors, mainly by ambitious investment in latest machinery, office automation software systems and computer-based solutions. Utilization of computer has benefited the employment market on vast scale, depending on the requirements of a particular business, its size and financial capabilities, and the intention to use. Furthermore, unparalleled technologies, such as cloud computing and smart technologies has directly affected demand for modern day labour. Nowadays, the utility model of cloud computing made it more popular and a favourite choice for the institutes to free up their internal resources and also reduce the number of administrative staff needed to maintain it. With certain kinds of offerings, institutes operating at small scales are also benefitting, which was almost impossible only a decade ago. Given that, the successful utilization of cloud computing remains a topic of extra ordinary importance among the scholars, experts, interested groups and several other institutions, and is defined in different ways according to their particular understanding and usage. But cloud is best defined by National institutes of standard and technology.}, language = {en} } @inproceedings{PrietoGonzalezTammStantchev2016, author = {Prieto-Gonz{\´a}lez, Lisardo and Tamm, Gerrit and Stantchev, Vladimir}, title = {Towards a Software Engineering Approach for Cloud and IoT Services in Healthcare}, series = {Computational Science and Its Applications}, booktitle = {Computational Science and Its Applications}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-42089-9}, pages = {439 -- 452}, year = {2016}, abstract = {In this work a tailored approach for requirements engineering for risk management solutions is presented. The approach focuses on cross-disciplinary risk paradigms in inpatient healthcare and aims to provide a novel methodology that accounts for specific viewpoints of relevant expert groups. The presented results demonstrate the feasibility and usefulness of the approach in the context of the current evaluation within the German market.}, language = {en} } @article{PrietoGonzalezTammStantchev2015, author = {Prieto-Gonz{\´a}lez, Lisardo and Tamm, Gerrit and Stantchev, Vladimir}, title = {Governance of cloud computing: semantic aspects and cloud service brokers}, series = {International Journal of Web and Grid Services}, volume = {11}, journal = {International Journal of Web and Grid Services}, number = {4}, pages = {377 -- 389}, year = {2015}, abstract = {This paper provides an overview of cloud governance aspects based on a representative survey of trends in the perception, assessment and adoption of cloud computing within the enterprise. The survey was conducted through a twofold research approach and combined a meta-study of existing and published empirical studies with an own empirical study within a representative group of European and international enterprises. We consider governance through the prism of adoption drivers and focus on the role of cloud brokers and cloud marketplaces more specifically, as well as the inclusion of semantic based strategies oriented to enhance the quality of service offered by cloud service brokers.}, language = {en} } @book{EichhornHeinzeTammetal.2016, author = {Eichhorn, Bert and Heinze, Bj{\"o}rn and Tamm, Gerrit and Schuhmann, Ralph}, title = {Internetrecht im E-Commerce}, publisher = {Springer Vieweg}, address = {Berlin [u.a.]}, isbn = {978-3-662-45307-0}, publisher = {SRH Berlin University of Applied Sciences}, pages = {XVII, 216}, year = {2016}, abstract = {Den Schwerpunkt des Buches bildet das „Internet der Dienste", welches den E-Commerce pr{\"a}gt. Hier stehen Fragen des Vertragsschlusses im Internet, der Haftung f{\"u}r Inhalte unter Ber{\"u}cksichtigung domain- und markenrechtlicher Fragen sowie der Datenschutz, der Schutz von geistigem Eigentum und der faire Umgang im Wettbewerb im Mittelpunkt. Zunehmend verbindet sich das „Internet der Dienste" jedoch mit dem „Internet der Dinge". Auch die mit diesem „Internet der Zukunft" verbundenen rechtlichen Probleme - wie Big Data oder der Vertragsschluss Mensch-Maschine - werden aufgegriffen. Dieses Buch erschließt das Internet f{\"u}r den E-Commerce aus rechtlicher Sicht. Es zeigt Unternehmen wie Verbrauchern ihre diesbez{\"u}glichen Rechte, Pflichten und Verantwortlichkeiten auf. Zielgruppe sind Praktiker sowie Studierende aus allen Fachrichtungen. Anhand eines durchgehenden Beispielfalls und der aktuellen Rechtsprechung werden die verschiedenen Themen anschaulich dargestellt.}, language = {de} }