@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} } @inproceedings{OpazoBasaezGhulamAriasArandaetal.2014, author = {Opazo Basaez, Marco and Ghulam, Sarfaraz and Arias Aranda, Daniel and Stantchev, Vladimir}, title = {Smart healthcare services: a patient oriented cloud computing solution}, pages = {18}, year = {2014}, abstract = {Objectives/rationale: Healthcare systems all over the world are facing difficult challenges that have a direct impact and influence the delivery of healthcare services. As a response healthcare institutions are relying in the implementation of Information and communication technologies (ICTs) to overcome difficulties and satisfy patients' demands in a cost-effective way adopting new technologies capable to innovate, extend, and redefine the way healthcare has been delivered for decades. New technological innovations such as Internet of things (IoT), Smart item technology, and cloud computing can improve the traditional e-healthcare system and extend service provision beyond the hospital facilities by using wireless sensor networks (WSN) and radio frequency identification devices (RFID), providing a new type of services advertised as "smart." This type of services, enable doctors to treat patients remotely and allows people to do their normal daily routines, occupations, and activities while receiving appropriate, timely, and high-quality ubiquitous healthcare services. Methods: An exploratory study is performed to review the route towards smart healthcare services, emphasizing the use of information and communication technologies (ICTs) and smart item technology as enhancers for smart healthcare services provision. Results/findings: A new technological infrastructure promises to transform medical practice and disease prevention by empowering healthcare institutions with smart items for remote patient monitoring eliminating time-wasting procedures, reducing health costs, improving quality of service and patients satisfaction. Implications/conclusions: Traditional e-healthcare system is transitioning into an interconnected smart-healthcare system potentiated by new technological advances capable to extend healthcare service provision and offer smart healthcare services.}, language = {en} } @article{PrietoGonzalezStantchevColomoPalacios2014, author = {Prieto-Gonz{\´a}lez, Lisardo and Stantchev, Vladimir and Colomo-Palacios, Ricardo}, title = {Applications of ontologies in knowledge representation of human perception}, series = {International Journal of Metadata, Semantics and Ontologies}, journal = {International Journal of Metadata, Semantics and Ontologies}, pages = {74 -- 80}, year = {2014}, abstract = {Information overload is becoming bigger as internet grows. This entails several problems such as difficulty in finding information and redundancy of knowledge. In this paper, a solution of these problems is presented as a global representation of knowledge based on human perception, and modelled by means of ontologies. In this study we present the approach with several advantages as well as some drawbacks related to state of the art technologies.}, 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{StantchevHoangSchulzetal.2008, author = {Stantchev, Vladimir and Hoang, Trung Dang and Schulz, Tino and Ratchinski, Ilja}, title = {Optimizing Clinical Processes with Position-Sensing}, series = {IT Professional}, volume = {10}, journal = {IT Professional}, number = {2}, pages = {31 -- 37}, year = {2008}, abstract = {The authors propose an optimization of clinical processes with position- sensing technologies and evaluate existing solutions and their applicability.}, 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{AlvarezRodriguezColomoPalaciosStantchev2015, author = {{\´A}lvarez-Rodr{\´i}guez, Jose Mar{\´i}a and Colomo-Palacios, Ricardo and Stantchev, Vladimir}, title = {Skillrank: towards a Hybrid Method to Assess Quality and Confidence of Professional Skills in Social Networks}, series = {Scientific Programming}, journal = {Scientific Programming}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-7264}, pages = {14}, year = {2015}, abstract = {The present paper introduces a hybrid technique to measure the expertise of users by analyzing their profiles and activities in social networks. Currently, both job seekers and talent hunters are looking for new and innovative techniques to filter jobs and candidates where candidates are trying to improve and make their profiles more attractive. In this sense, the Skillrank approach is based on the conjunction of existing and well-known information and expertise retrieval techniques that perfectly fit the existing web and social media environment to deliver an intelligent component to integrate the user context in the analysis of skills confidence. A major outcome of this approach is that it actually takes advantage of existing data and information available on the web to perform both a ranked list of experts in a field and a confidence value for every professional skill. Thus, expertise and experts can be detected, verified, and ranked using a suited trust metric. An experiment to validate the Skillrank technique based on precision and recall metrics is also presented using two different datasets: (1) ad hoc created using real data from a professional social network and (2) real data extracted from the LinkedIn API.}, 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} } @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} } @article{PrietoGonzalezStantchevColomoPalacios2014, author = {Prieto-Gonz{\´a}lez, Lisardo and Stantchev, Vladimir and Colomo-Palacios, Ricardo}, title = {Applications of ontologies in knowledge representation of human perception}, series = {International Journal of Metadata, Semantics and Ontologie}, volume = {9}, journal = {International Journal of Metadata, Semantics and Ontologie}, number = {1}, pages = {74 -- 80}, year = {2014}, abstract = {Information overload is becoming bigger as internet grows. This entails several problems such as difficulty in finding information and redundancy of knowledge. In this paper, a solution of these problems is presented as a global representation of knowledge based on human perception, and modelled by means of ontologies. In this study we present the approach with several advantages as well as some drawbacks related to state of the art technologies.}, language = {en} } @article{DzombetaStantchevColomoPalaciosetal.2014, author = {Dzombeta, Srdan and Stantchev, Vladimir and Colomo-Palacios, Ricardo and Brandis, Knud and Haufe, Knut}, title = {Governance of Cloud Computing Services for the Life Sciences}, series = {IT Professional}, volume = {16}, journal = {IT Professional}, number = {4}, url = {http://nbn-resolving.de/urn:nbn:de:0298-opus4-5908}, pages = {2 -- 9}, year = {2014}, abstract = {This analysis of the legal regulations for cloud computing in healthcare is based on the authors' expertise in cloud-based data processing for healthcare and life sciences organizations. The proposed implementation roadmap should help organizations govern health data processing and storage.}, language = {en} } @article{StantchevColomoPalaciosSotoAcostaetal.2014, author = {Stantchev, Vladimir and Colomo-Palacios, Ricardo and Soto Acosta, Pedro and Misra, Sanjay}, title = {Learning management systems and cloud file hosting services: a study on students' acceptance}, series = {Computers in Human Behavior}, volume = {31}, journal = {Computers in Human Behavior}, pages = {612 -- 619}, year = {2014}, abstract = {The aim of this paper is to investigate the motivations that lead higher education students to replace several Learning Management Systems (LMS) services with cloud file hosting services for information sharing and collaboration among them. The research approach is based on the Technology Acceptance Model (TAM). More specifically, the model is devoted to identifying barriers and enablers to the acceptance of these technologies. A questionnaire comprising three factors (Attitude toward using technology, Perceived ease of use and Perceived usefulness) was applied to a sample consisting of 121 higher education students. Results show that the perceived ease of use of cloud file hosting services is above that of LMS tools and services and that cloud file hosting services presented higher levels of perceived usefulness than standard learning management tools. In addition, attitude toward using cloud file hosting services is well above that of using LMS tools.}, language = {en} } @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} }