Stella Gatziu Grivas

University of Applied Sciences and Arts Northwestern Switzerland | FHNW · Department of Business Administration

Digital technologies enable new forms of value creation, value proposition, and value capturing for all kinds of organizations in all kinds of industries. Often, companies strive to digital transform and obtain consultancy services due to missing expert knowledge on how to approach the transformation. Interestingly, research shows that the consulti...

This paper introduces a novel approach for organizational error management based on a model combining a positive mistakes-making culture with the use of collective intelligence. The model allows to identify mistakes and problems in everyday work in organizations along predefined key performance indicators (KPIs), such as they are represented by the...

Digital technologies enable new forms of value creation, value proposition, and value capturing for all kinds of organizations in all kinds of industries. Often, companies strive to digital transform and obtain consultancy services due to missing expert knowledge on how to approach the transformation. Interestingly, research shows that the consulti...

The digital age poses manifold challenges and difficult conditions for all sizes of organizations in all industries. Organizations need to adapt to complex challenges and difficult conditions and to plan and execute their digital transformation strategies. More and more organizations need support by strategic business consulting companies which mus...

The goal of this paper is to demonstrate the feasibility of combining visualization and reasoning for business model design by combining the machine-interpretability of ontologies with a further development of the widely accepted business modeling tool, the Business Model Canvas (BMC). Since ontologies are a machine-interpretable representation of...

Digitale Technologien verändern die Art und Weise, wie Menschen miteinander arbeiten, wie sie konsumieren, leben und interagieren. Es handelt sich dabei um einen kontinuierlichen Wandel, der Unternehmen sowohl vor großen Herausforderungen stellt, als ihnen auch zahlreiche Chancen bietet. Die Transformation der Unternehmung in das digitale Zeitalter...

The goal of this paper is to demonstrate the need for a structured method to identify skills and competencies that are required for a holistic digital transformation for a certain company in its particular environment. A framework called Transformation Compass, which includes all relevant business areas of an enterprise and where technology is seen...

Emerging technologies compel small and medium sized enterprises (SMEs) to advance their digital transformation. However, a conclusive and applicable overview on influencing factors for the evaluation and adoption of new technologies, on a sensitizing level, is nonexistent. Previous work has focused on adoption frameworks on an implementation level,...

The goal of this paper is to demonstrate the need for a structured framework and instrument to support SME in adjusting their organizational strategy to environmental changes in the digital age. Since SME in particular face many challenges transforming their business, a structured and easy to use approach that takes into account the challenges and...

Existing cloud maturity models define the level of maturity according to the number of cloud solutions implemented or the duration of deployment. However, this does not include the motivation regarding why cloud solutions are used in an enterprise. Likewise, there has been no investigated into what changes the deployment of cloud services entails,...

This research paper describes the specifics of an industry ecosystem and its definition as well as the challenges occurring while transforming the ecosystem. The goal is to demonstrate the need for further research towards creating a systematic approach to solve these challenges. A framework of an industry ecosystem and its transformation towards d...

Service platforms require a transparent and if possible systematic overview of the industry they are placed in. Currently, no modelling method for specifying industry ecosystems is available. However, the paper describes the specif-ics of a developed industry ecosystem modelling method. It consists of an actor-relation layer, to illustrate the type...

Die Digitale Transformation hat Hochkonjunktur: Seit etwa 2014/2015 gehört dieses Schlagwort zum Handwerk aller Mitarbeitenden in Beratungsfirmen und auf Geschäftsleitungs-, Abteilungs- und Projektleitungsebenen. Die Treiber der Digitalen Transformation sind unzählige neue Datenquellen, neue Technologien sowie Anforderungen vom Markt und von Gesch...

Large scale telecommunications networks need to be continuously monitored to detect problems and react accordingly to ensure the networks stability. Current monitoring systems are well capable to monitor such large scale installations for simple situations like failing routers, links or abnormal link utilization. However, current systems fail to pr...

This paper presents a four-phase cloud service lifecycle to support small and medium-sized enterprises (SMEs) in helping them make the best possible decisions about migrating their IT services to a cloud and perform that migration smoothly.

Cloud Service Brokerage systems are still in an early stage and mostly do not satisfy the existing demand of Cloud Consumers and Cloud Providers. An important aspect of Cloud Service Brokerage (CSB) Systems is to locate services as per the requirements of a Cloud Consumer. In the wide and varied world of Cloud Services, every single service varies...

Cloud Computing is still at the top of the agenda of almost every company. The market for cloud services grew consistently over the last year and is expected to continue to rise over the next few years. To justify the investment, companies need to carefully evaluate the costs, benefits and risks of cloud services and create a compelling business ca...

Cloud computing is an emerging technology that offers opportunities for organisations to hire precisely those ICT services they need (SaaS/PaaS/IaaS). Small and medium sized enterprises (SMEs) can benefit a lot from software services that are managed in a professional way. Cloud computing enables them to overcome restrictions from low budgets and l...

Location-based services (LBS) in general allow information processing with respect to three dimensions: space, time and semantics/content. Social me-dia allows using people's social network for information processing. The wide use of both techniques motivates to merge them into new application domains. In this paper we present our first experiences...

With the advent of Cloud Computing and the advantages it brings to businesses, there is a keen interest by businesses to adopt these technologies from a strategic advantage viewpoint. This growing interest throws up a challenge to businesses to identify solutions and providers that fits their requirements. It becomes difficult for them to locate an...

The Smart Grid will largely increase the amount of measurement data that needs to be processed on distribution grid level in order to fulfill the promised smart behavior. Many modern information systems are capable of handling the produced data amounts quite well. However they are usually highly specialized systems that are costly to change or limi...

We propose an Activity Service as a component in cloud computing. As a particular novelty we base this Activity Service on the well-defined and proven semantics of Active Database Management Systems (ADBMS) to overcome the challenges of developing portable cloud based event processing applications. As contribution of this paper we provide the first...

OSGi is a popular Java-based platform, which has its roots in the area of embedded systems. However, nowadays it is used more and more in enterprise systems. To fit this new application area, OSGi has recently been extended with the Remote Services specification. This specification enables distribution, which OSGi was previously lacking. However, t...

This paper is about the current state of security in cloud computing. It shows some of the key benefits and the major drawbacks that come around with swapping out services and infrastructure to a public cloud. Based on these benefits and drawbacks, K.O. (knock-out) criteria will be identified, which can be seen as the minimum basis for secure cloud...

Recently a number of approaches to combining Semantic Web technologies such as RDF(S) and OWL with complex event processing have been proposed. This paper examines these approaches, by emphasizing their advantages and challenges.

This paper discusses the foundations for the implementation of an event processing framework for cloud ecosystems. The idea is to provide standard functionalities which allow users to build cloud solutions capable to respond autonomously to upcoming events, altered environmental conditions or changing needs. Therefore we propose an event-driven-ser...

This paper describes two approaches to scaling in cloud environments - semi-automatic (also called by request) and automatic (also called on demand) - and explains why the latter is to prefer. Semi-automatic scaling is illustrated with an example of Amazon Elastic Compute Cloud, whereas automatic scaling is illustrated with an example of Amazon Web...

The viability of cloud computing for information-intensive tasks arising in real-time opinion mining and sentiment analysis of large online text streams is described. We show how a smart distributed architecture enables an efficient and scalable design for opinion mining on internet-based content that answers key challenges, such as integrating het...

The paper presents the OM4SPACE project, which aims to provide an integration of active functionality into cloud environments to enable applications to further benefit from the agility of this new environment. In particular, we propose an activity service that incorporates well defined interfaces and the clear semantic of Active Database Management...

Today there is a need in on-line shops to support the visitors of a web page appropriately by analyzing their current situation. In this paper we introduce a model which supports the identification of the content the user is interested in and the shopping strategy of the current session. We use context information extracted from enterprise data, co...

Handling changes of business processes, and making sure systems are up and running after a change in the business process with minimum downtime is something which has been of interest to researchers for long and there have been several approaches proposed for it. With Cloud computing becoming increasingly popular businesses require a strong system...

Cloud computing has emerged as a strong factor driving companies to remarkable business success. Far from just being an IT level support solution cloud computing is triggering changes in their core business models by making them more efficient and cost-effective. This has generated an interest for a lot of companies to try and adopt cloud computing...

We propose an activity service as a component in cloud computing with the particular novelty that we base this service on the well-defined and proven semantics of Active Database Management Systems (Active DBMS). In addition, we utilize well-known principles of service oriented architectures. Furthermore we aim to provide an integration with a clou...

Active object-oriented database management systems incorporate object-oriented database technology and active mechanisms such as event-condition-action rules (ECA-rules). SAMOS has been among the first representatives of this class of systems. During the development of SAMOS, numerous then open research questions have been addressed. In this paper,...

this report, we review the presentations given at the DMDW workshop and present some open problems which we believe should be addressed by future research and whose solution could contribute to make data warehouse research more relevant to the practice.

Data warehouse refreshment is often viewed as a problem of maintaining materialized views over operational sources. In this paper, we show that the data warehouse refreshment process is a complex process comprising several tasks, e.g., monitoring, extracting, transforming, integrating and cleaning operational data, deriving new data, building histo...

The topic of data warehousing [2,4] comprises architectures, algorithms, models, tools, organizational and management issues for integrating data from several operational systems in order to provide information for decision support, e.g., using data mining techniques or OLAP (on-line analytical processing) tools. Thus, in contrast to operational sy...

The construction system FRAMBOISE is intended to provide active database mechanisms by bundling them together out of existing, prefabricated components realizing specic active database tasks. The systems built by means of FRAMBOISE are built according to a common architecture. This reference architecture not only serves as a blueprint to assemble s...

Data warehouse refreshment is often viewed as a problem of maintaining materialized views over operational sources. In this paper, we show that the data warehouse refreshment process is a complex process comprising several tasks, e.g., monitoring, extracting, transforming, integrating and cleaning operational data, deriving new data, building histo...

Data warehouse refresh incorporates issues on how to capture and propagate updates occurring in operational systems into the warehouse in order to keep the data warehouse up-to-date. In this paper, we propose an object-oriented approach for the incremental refresh of data warehouses which considers the special nature of warehouse data, e.g., its te...

In the last years, data warehousing has become very popular in organizations. The size of the data warehouse market is expected to be at least $8 billion at the end of 1998, and more than 900 vendors provide various kinds of hardware, software, and services for data warehousing. The research community noticed this trend as well and determined data...

This chapter gives a brief overview of the SAMOS project which has been underway since 1991 at the Database Technology Research Group at the University of Zurich, the main goal of which is the development of an active object-oriented database system supporting advanced active functionality. The first implementation of the SAMOS prototype (release...

New application areas or new technical innovations expect from database management systems more and more new functionality. However, adding functions to the DBMS as an integral part of them, tends to create monoliths that are difficult to design, implement, validate, maintain and adapt. Such monoliths can be avoided if one configures DBMS according...

In this paper we investigate the definition, detection, and management of events in the active object-oriented database system SAMOS. First, we present various event specification facilities based on simple but nevertheless powerful constructs which support the modelling of time aspects as well. Second we show how events can be detected in an effic...

x events. This allows a high expressive power for the specification of active behavior, but at the same time aggravates the problems mentioned above. The concepts underlying these tools are discussed in [4] and are an extension of classical approaches [1] that also considers rules including complex events. The context of the demonstration is a smal...

The powerful functionality that active mechanisms add to database management systems presents, besides many advantages, a number of problems related to the control of their behavior. This paper deals with one of these problems: the termination of rule execution. We explain the termination aspect and the aim of termination analysis. Then, we present...

Current active database management systems (ADBMS) are typically realized as monolithic, tightly integrated software systems. Separating the active database mechanisms from the DBMS, would open the opportunity to use them in a variety of ways and environments. In order to build the respective decoupled active database facilities, construction syste...

Summary form only given. Active database management systems (active DBMS) support the definition, management and execution of event/condition/action rules specifying reactive application behavior. Although the advantages of active mechanisms are nowadays well known, there is still no wide use in practice. One main problem is that especially for lar...

. Active database systems have been a hot research topic for quite some years now. However, while "active functionality" has been claimed for many systems, and notions such as "active objects" or "events" are used in many research areas (even beyond database technology), it is not yet clear which functionality a database management system must supp...

The architecture and the implementation of the active, object-oriented database management system SAMOS 2 are described. SAMOS is a research prototype extending a commercial object-oriented database management system with reactive behavior specified in the form of event-condition-action rules. This paper describes the various components of SAMOS fo...

The detection of events in an active database system turns out to be a difficult problem due to the expressive event specification languages proposed in the recent past which include, among others, complexly defined events (composite events). Therefore, a mechanism is required that is suitable to model the semantics of composite events and to imple...

Active database management systems (ADBMSs) support the specification of reactive behavior in the form of event-condition-action rules. The capability to modify the definition of reactive behavior is a crucial part of the ADBMS-functionality. Rulebase evolution is however a complex problem in systems that support composite events, particularly when...

We describe SAMOS, an active object-oriented database management system prototype. SAMOS offers a powerful rule definition language, including a small yet powerful set of event definition facilities. It is able to detect primitive and composite events automatically and efficiently. Upon event detection, SAMOS executes rules attached to the occurred...

This paper describes the active, object-oriented database system SAMOS being developed as a research prototype. Its main approach is the integration of rules in the sense of active database systems into a general object-oriented data model. Our effort is also focussed on integrating the rule system with transaction processing in a meaningful way. 1...

Active mechanisms based on event-condition-action rules will play an important role in next-generation database management systems. As an event, in its most general form, is essentially a point in time, it is obvious that an appropriate concept of time is needed for the specification of events. However, there are also other aspects related to time...

Active database systems have been a hot research topic for quite some years now. However, while "active functionality" has been claimed for many systems, and notions such as "active objects" or "events" are used in many research areas (even be- yond database technology), it is not yet clear which functionality a database manage- ment system must su...

ANSI SQL-92 [MS, ANSI] defines Isolation Levels in terms of phenomena: Dirty Reads, Non-Repeatable Reads, and Phantoms. This paper shows that these phenomena and the ANSI SQL definitions fail to properly characterize several popular isolation ...

A benchmark for active database management systems is described. We are particularly interested in performance tests that help to identify performant and inefficient components. Active functionality that is relevant with respect to perfor- mance is identified, and a series of tests is designed that measure the ef ficiency of the performance-critica...

The detection of events in an active database system turns out to be a difficult problem due to the expressive event specification languages proposed in the recent past which include, among others, complexly defined events (composite events). Therefore, a mechanism is required that is suitable to model the semantics of composite events and to imple...

Aktive Datenbanksysteme (aDBS) basieren auf Ereignis/Bedingung/Aktions-Regeln (ECA-Regeln), mit deren Hilfe dem System mitgeteilt wird, wie es bei Eintreten bestimmter modellierter Situationen reagieren soll. Besonders den für die Formulierung von Ereignissen angebotenen Konzepten kommt dabei hohe Bedeutung für die Leistungsfähigkeit des Systems zu...

events are not detected by SAMOS, but users/applications have to notify the system about their occurrence by issuing an explicit raise operation. 2.2 Composite events The kinds of primitive events described above correspond to elementary occurrences and are not adequate for handling events that occur when some combination of other events happens. T...

This paper describes the active, object-oriented database system SAMOS being developed as a research prototype. Its main approach is the integration of rules in the sense of active database systems into a general object-oriented data model. Our effort is also focussed on integrating the rule system with transaction processing in a meaningful way.