Humboldt-Universitat zu Berlin

Displaying 1-31 of 31 results

  • White Papers // Mar 2013

    Parallelization in Scientific Workflow Management Systems

    Over the last two decades, the scientific community witnessed the establishment of computation as an integral part of research beside the traditional paradigms of theory and experiment. Over the last two decades, Scientific Workflow Management Systems (SWfMS) have emerged as a means to facilitate the design, execution, and monitoring of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2012

    Performance Optimization for Distributed Intra-Node-Parallel Streaming Systems

    The performance of intra-node parallel dataflow programs in the context of streaming systems depends mainly on two parameters: the degree of parallelism for each node of the dataflow program as well as the batching size for each node. In the state-of-the-art systems the user has to specify those values manually....

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2012

    On Dynamics in Selfish Network Creation

    The authors consider the dynamic behavior of several variants of the Network Creation Game, introduced by Fabrikant et al. [PODC'03]. For this, they treat these games as sequential-move games and analyze whether selfish play eventually leads to an equilibrium state of the game. They show that fast convergence is guaranteed...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2012

    Peeking into the Optimization of Data Flow Programs with MapReduce-Style UDFs

    Data flows are a popular abstraction to define data-intensive processing tasks. In order to support a wide range of use cases, many data processing systems feature MapReduce-style User-Defined Functions (UDFs). In contrast to UDFs as known from relational DBMS, MapReduce-style UDFs have less strict templates. These templates do not alone...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Nov 2012

    Aeolus: An Optimizer for Distributed Intra-Node-Parallel Streaming Systems

    Aeolus is a prototype implementation of a topology optimizer on top of the distributed streaming system Storm. Aeolus extends Storm with a batching layer which can increase the topology's throughput by more than one order of magnitude. Furthermore, Aeolus implements an optimization algorithm that computes the optimal batch size and...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Nov 2012

    An Empirical Investigation on the Design of Process Architectures

    Large-scale enterprises struggle with an effective alignment of business processes and IT services with business strategy. While process models play an important role for bridging between strategy and IT, there is a need to systematically organize the huge number of models. Process architecture defines an overarching structure for the organization...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // May 2012

    Realizing Benefits from Enterprise Architecture: A Measurement Model

    Enterprise Architecture (EA) management has become an intensively discussed approach to manage enterprise transformations. Despite the popularity and potential of EA, both researchers and practitioners lament a lack of knowledge about the realization of benefits from EA. To determine the benefits from EA, the authors explore the various dimensions of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2012

    Probabilistic Optimization of Semantic Process Model Matching

    Business Process Models are increasingly used by companies, often yielding repositories of several thousand models. These models are of great value for business analysis such as service identification or process standardization. A problem is though that many of these analyses require the pairwise comparison of process models, which is hardly...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Feb 2012

    Generating Natural Language Texts from Business Process Models

    Process Modeling is a widely used concept for understanding, documenting and also redesigning the operations of organizations. The validation and usage of process models is however affected by the fact that only business analysts fully understand them in detail. This is in particular a problem because they are typically not...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jan 2012

    Collaboration Features in Current BPM Tools

    In cross-organizational, distributed environments, Business Process Management requires collaborative technologies to facilitate the process of discovering, modeling, and improving business processes across geographical and organizational boundaries. This paper provides a comprehensive understanding of collaborative business process modeling that is based on a review of literature and a case study of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jan 2012

    Automatic Derivation of Service Candidates from Business Process Model Repositories

    Although several approaches for service identification have been defined in research and practice, there is a notable lack of automatic analysis techniques. In this paper, the authors take the integrated approach by Kohlborn et al. as a starting point, and combine different analysis techniques in a novel way. Their contribution...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2011

    On the Refactoring of Activity Labels in Business Process Models

    Large corporations increasingly utilize business process models for documenting and redesigning their operations. The extent of such modeling initiatives with several hundred models and dozens of often hardly trained modelers calls for automated quality assurance. While formal properties of control flow can easily be checked by existing tools, there is...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Sep 2011

    The Relation Between Dynamic Business Models and Business Cases

    The agility of companies can be increased when implementing merged or changed business models in the organization and when using business cases to determine if it is time to change the business model. This paper clarifies the relation between business models, as an implementation of a company's strategy, and business...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2011

    CRRA Utility Maximization Under Risk Constraints

    This paper studies the problem of optimal investment with CRRA (Constant, Relative Risk Aversion) preferences, subject to dynamic risk constraints on trading strategies. The market model considered is continuous in time and incomplete; furthermore, financial assets are modeled by It o processes. The dynamic risk constraints (time, state dependent) are...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2011

    A Main Memory Index Structure to Query Linked Data

    A possible approach to query Linked Data combines the actual evaluation of a query with the traversal of data links in order to discover and retrieve potentially relevant data. An implementation of this idea requires approaches that support an efficient and flexible management of temporary, ad hoc data collections that...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Feb 2011

    Monetary Policy, Trend Inflation And Inflation Persistence

    This paper presents a new mechanism through which monetary policy rules affect inflation persistence. When assuming that price reset hazard functions are not constant, backward-looking dynamics emerge in the NKPC. This new mechanism makes the traditional demand channel of monetary transmission have a long-lasting effect on inflation dynamics. The Calvo...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2010

    Peeling Away Layers of an RFID Security System

    The Legic Prime system uses proprietary RFIDs to secure building access and micropayment applications. The employed algorithms rely on obscurity and consequently did not withstand scrutiny. This paper details how the algorithms were found from opening silicon chips as well as interacting with tags and readers. The security of the...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Oct 2010

    Object-Sensitive Action Patterns in Process Model Repositories

    Organizations maintain large repositories of business process models. While maintenance and management of these repositories are challenging, they also offer opportunities when used as a knowledge base systematically. For instance, repositories can be leveraged to provide modeling support and, therefore, help to assure the consistency of newly created models with...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Aug 2010

    The System Architecture of the Open European Nephrology Science Centre

    The amount and heterogeneity of data in biomedical research, notably in interdisciplinary research, requires new methods for the collection, presentation and analysis of information. Important data from laboratory experiments as well as patient trials are available but come out of distributed resources. The Charite Medical School in Berlin has established...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2010

    Prediction of Business Process Model Quality based on Structural Metrics

    The quality of Business Process Models is an increasing concern as enterprise-wide modeling initiatives have to rely heavily on non-expert modelers. Quality in this paper can be directly related to the actual usage of these process models, in particular to their understandability and modifiability. Since these attributes of a model...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // May 2010

    Efficient Consistency Measurement based on Behavioural Profiles of Process Models

    Engineering of process driven business applications can be supported by process modeling efforts in order to bridge the gap between business requirements and system specifications. However, diverging purposes of business process modeling initiatives have led to significant problems of aligning related models at different abstract levels and different perspectives. Checking...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // May 2010

    Can The New Keynesian Phillips Curve Explain Inflation Gap Persistence?

    Whelan (2007) found that the generalized Calvo-sticky-price model fails to replicate a typical feature of the empirical reduced-form Phillips curve - the positive dependence of inflation on its own lags. In this paper, the author shows that it is the 4-period-Taylor-contract hazard function he chose that gives rise to this...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Apr 2010

    Refactoring of Process Model Activity Labels

    Recently many companies have expanded their Business Process Modeling projects such that thousands of process models are designed and maintained. Activity labels of these models are related to different styles according to their grammatical structure. There are several guidelines that suggest using a verb-object labeling style. Meanwhile, real-world process models...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2009

    On Labeling Quality in Business Process Models

    Quality assurance is a serious issue for large-scale process modeling initiatives. While formal control flow analysis has been extensively studied in prior research, there is a little work on how the textual content of a process model and its activity labels can be systematically analyzed. It is a major challenge...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Oct 2009

    Discussion Of "Measuring Organizational Capital"

    Ludewig and Sadowski (2009) empirically examine the economic value of organizational capital. They use a comprehensive panel data set from the Institute for Employment Research (IAB) that provides standard information about inputs and outputs of the production process of German corporate establishments. This data set also includes organizational dimensions of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jul 2009

    The Impact of Secondary Notation on Process Model Understanding

    Models of business processes are usually created and presented using some visual notation. In this way, one can express important activities, milestones, and actors of a process using interconnected graphical symbols. While it has been established for other types of models that their graphical layout is a factor in making...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2009

    A Machine Learning Approach to Foreign Key Discovery

    The authors study the problem of automatically discovering semantic associations between schema elements, namely foreign keys. This problem is important in all applications where data sets need to be integrated that are structured in tables but without explicit foreign key constraints. If such constraints could be recovered automatically, querying and...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2009

    Instantaneous Soundness Checking of Industrial Business Process Models

    The authors report on a case study on control-flow analysis of Business Process Models. They checked 735 industrial Business Process Models from financial services, telecommunications and other domains. They investigated these models for soundness (absence of deadlock and lack of synchronization) using three different approaches: the business process verification tool...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Apr 2009

    Storing Data on RFID Tags: A Standards-Based Approach

    The potential of Radio Frequency Identification (RFID) for increasing supply chain efficiency has been repeatedly stressed by practitioners and researchers alike. The cross-company usage of RFID applications can only work if the collaborating companies agree on the syntax and semantic used. EPCglobal, an international industry consortium, has specified a stack...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2009

    Vertical Alignment of Process Models - How can we get there?

    There is a wide variety of drivers for business process modeling initiatives, reaching from business evolution and process optimization over compliance checking and process certification to process enactment. That, in turn, results in models that differ in content due to serving different purposes. In particular, processes are modeled on different...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2006

    Core Labour Standards And FDI: Friends Or Foes? The Case Of Child Labour

    The authors test the often-cited hypothesis that high levels of child labor attract foreign investors. Using panel data, they show the overall effect, which child labor has on Foreign Direct Investment (FDI), to be a (small) negative one. They find strong evidence for the theoretical prediction that child labor deters...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // May 2010

    Can The New Keynesian Phillips Curve Explain Inflation Gap Persistence?

    Whelan (2007) found that the generalized Calvo-sticky-price model fails to replicate a typical feature of the empirical reduced-form Phillips curve - the positive dependence of inflation on its own lags. In this paper, the author shows that it is the 4-period-Taylor-contract hazard function he chose that gives rise to this...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2006

    Core Labour Standards And FDI: Friends Or Foes? The Case Of Child Labour

    The authors test the often-cited hypothesis that high levels of child labor attract foreign investors. Using panel data, they show the overall effect, which child labor has on Foreign Direct Investment (FDI), to be a (small) negative one. They find strong evidence for the theoretical prediction that child labor deters...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Oct 2009

    Discussion Of "Measuring Organizational Capital"

    Ludewig and Sadowski (2009) empirically examine the economic value of organizational capital. They use a comprehensive panel data set from the Institute for Employment Research (IAB) that provides standard information about inputs and outputs of the production process of German corporate establishments. This data set also includes organizational dimensions of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2010

    Peeling Away Layers of an RFID Security System

    The Legic Prime system uses proprietary RFIDs to secure building access and micropayment applications. The employed algorithms rely on obscurity and consequently did not withstand scrutiny. This paper details how the algorithms were found from opening silicon chips as well as interacting with tags and readers. The security of the...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2012

    On Dynamics in Selfish Network Creation

    The authors consider the dynamic behavior of several variants of the Network Creation Game, introduced by Fabrikant et al. [PODC'03]. For this, they treat these games as sequential-move games and analyze whether selfish play eventually leads to an equilibrium state of the game. They show that fast convergence is guaranteed...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2012

    Performance Optimization for Distributed Intra-Node-Parallel Streaming Systems

    The performance of intra-node parallel dataflow programs in the context of streaming systems depends mainly on two parameters: the degree of parallelism for each node of the dataflow program as well as the batching size for each node. In the state-of-the-art systems the user has to specify those values manually....

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2012

    Peeking into the Optimization of Data Flow Programs with MapReduce-Style UDFs

    Data flows are a popular abstraction to define data-intensive processing tasks. In order to support a wide range of use cases, many data processing systems feature MapReduce-style User-Defined Functions (UDFs). In contrast to UDFs as known from relational DBMS, MapReduce-style UDFs have less strict templates. These templates do not alone...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Nov 2012

    Aeolus: An Optimizer for Distributed Intra-Node-Parallel Streaming Systems

    Aeolus is a prototype implementation of a topology optimizer on top of the distributed streaming system Storm. Aeolus extends Storm with a batching layer which can increase the topology's throughput by more than one order of magnitude. Furthermore, Aeolus implements an optimization algorithm that computes the optimal batch size and...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2013

    Parallelization in Scientific Workflow Management Systems

    Over the last two decades, the scientific community witnessed the establishment of computation as an integral part of research beside the traditional paradigms of theory and experiment. Over the last two decades, Scientific Workflow Management Systems (SWfMS) have emerged as a means to facilitate the design, execution, and monitoring of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2011

    On the Refactoring of Activity Labels in Business Process Models

    Large corporations increasingly utilize business process models for documenting and redesigning their operations. The extent of such modeling initiatives with several hundred models and dozens of often hardly trained modelers calls for automated quality assurance. While formal properties of control flow can easily be checked by existing tools, there is...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // May 2010

    Efficient Consistency Measurement based on Behavioural Profiles of Process Models

    Engineering of process driven business applications can be supported by process modeling efforts in order to bridge the gap between business requirements and system specifications. However, diverging purposes of business process modeling initiatives have led to significant problems of aligning related models at different abstract levels and different perspectives. Checking...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jul 2009

    The Impact of Secondary Notation on Process Model Understanding

    Models of business processes are usually created and presented using some visual notation. In this way, one can express important activities, milestones, and actors of a process using interconnected graphical symbols. While it has been established for other types of models that their graphical layout is a factor in making...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2009

    Vertical Alignment of Process Models - How can we get there?

    There is a wide variety of drivers for business process modeling initiatives, reaching from business evolution and process optimization over compliance checking and process certification to process enactment. That, in turn, results in models that differ in content due to serving different purposes. In particular, processes are modeled on different...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2009

    Instantaneous Soundness Checking of Industrial Business Process Models

    The authors report on a case study on control-flow analysis of Business Process Models. They checked 735 industrial Business Process Models from financial services, telecommunications and other domains. They investigated these models for soundness (absence of deadlock and lack of synchronization) using three different approaches: the business process verification tool...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Sep 2011

    The Relation Between Dynamic Business Models and Business Cases

    The agility of companies can be increased when implementing merged or changed business models in the organization and when using business cases to determine if it is time to change the business model. This paper clarifies the relation between business models, as an implementation of a company's strategy, and business...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2011

    A Main Memory Index Structure to Query Linked Data

    A possible approach to query Linked Data combines the actual evaluation of a query with the traversal of data links in order to discover and retrieve potentially relevant data. An implementation of this idea requires approaches that support an efficient and flexible management of temporary, ad hoc data collections that...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Apr 2009

    Storing Data on RFID Tags: A Standards-Based Approach

    The potential of Radio Frequency Identification (RFID) for increasing supply chain efficiency has been repeatedly stressed by practitioners and researchers alike. The cross-company usage of RFID applications can only work if the collaborating companies agree on the syntax and semantic used. EPCglobal, an international industry consortium, has specified a stack...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Aug 2010

    The System Architecture of the Open European Nephrology Science Centre

    The amount and heterogeneity of data in biomedical research, notably in interdisciplinary research, requires new methods for the collection, presentation and analysis of information. Important data from laboratory experiments as well as patient trials are available but come out of distributed resources. The Charite Medical School in Berlin has established...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2009

    A Machine Learning Approach to Foreign Key Discovery

    The authors study the problem of automatically discovering semantic associations between schema elements, namely foreign keys. This problem is important in all applications where data sets need to be integrated that are structured in tables but without explicit foreign key constraints. If such constraints could be recovered automatically, querying and...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2011

    CRRA Utility Maximization Under Risk Constraints

    This paper studies the problem of optimal investment with CRRA (Constant, Relative Risk Aversion) preferences, subject to dynamic risk constraints on trading strategies. The market model considered is continuous in time and incomplete; furthermore, financial assets are modeled by It o processes. The dynamic risk constraints (time, state dependent) are...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Feb 2011

    Monetary Policy, Trend Inflation And Inflation Persistence

    This paper presents a new mechanism through which monetary policy rules affect inflation persistence. When assuming that price reset hazard functions are not constant, backward-looking dynamics emerge in the NKPC. This new mechanism makes the traditional demand channel of monetary transmission have a long-lasting effect on inflation dynamics. The Calvo...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jan 2012

    Collaboration Features in Current BPM Tools

    In cross-organizational, distributed environments, Business Process Management requires collaborative technologies to facilitate the process of discovering, modeling, and improving business processes across geographical and organizational boundaries. This paper provides a comprehensive understanding of collaborative business process modeling that is based on a review of literature and a case study of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Nov 2012

    An Empirical Investigation on the Design of Process Architectures

    Large-scale enterprises struggle with an effective alignment of business processes and IT services with business strategy. While process models play an important role for bridging between strategy and IT, there is a need to systematically organize the huge number of models. Process architecture defines an overarching structure for the organization...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Mar 2012

    Probabilistic Optimization of Semantic Process Model Matching

    Business Process Models are increasingly used by companies, often yielding repositories of several thousand models. These models are of great value for business analysis such as service identification or process standardization. A problem is though that many of these analyses require the pairwise comparison of process models, which is hardly...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Feb 2012

    Generating Natural Language Texts from Business Process Models

    Process Modeling is a widely used concept for understanding, documenting and also redesigning the operations of organizations. The validation and usage of process models is however affected by the fact that only business analysts fully understand them in detail. This is in particular a problem because they are typically not...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // May 2012

    Realizing Benefits from Enterprise Architecture: A Measurement Model

    Enterprise Architecture (EA) management has become an intensively discussed approach to manage enterprise transformations. Despite the popularity and potential of EA, both researchers and practitioners lament a lack of knowledge about the realization of benefits from EA. To determine the benefits from EA, the authors explore the various dimensions of...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jan 2012

    Automatic Derivation of Service Candidates from Business Process Model Repositories

    Although several approaches for service identification have been defined in research and practice, there is a notable lack of automatic analysis techniques. In this paper, the authors take the integrated approach by Kohlborn et al. as a starting point, and combine different analysis techniques in a novel way. Their contribution...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Jun 2010

    Prediction of Business Process Model Quality based on Structural Metrics

    The quality of Business Process Models is an increasing concern as enterprise-wide modeling initiatives have to rely heavily on non-expert modelers. Quality in this paper can be directly related to the actual usage of these process models, in particular to their understandability and modifiability. Since these attributes of a model...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Oct 2010

    Object-Sensitive Action Patterns in Process Model Repositories

    Organizations maintain large repositories of business process models. While maintenance and management of these repositories are challenging, they also offer opportunities when used as a knowledge base systematically. For instance, repositories can be leveraged to provide modeling support and, therefore, help to assure the consistency of newly created models with...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Apr 2010

    Refactoring of Process Model Activity Labels

    Recently many companies have expanded their Business Process Modeling projects such that thousands of process models are designed and maintained. Activity labels of these models are related to different styles according to their grammatical structure. There are several guidelines that suggest using a verb-object labeling style. Meanwhile, real-world process models...

    Provided By Humboldt-Universitat zu Berlin

  • White Papers // Dec 2009

    On Labeling Quality in Business Process Models

    Quality assurance is a serious issue for large-scale process modeling initiatives. While formal control flow analysis has been extensively studied in prior research, there is a little work on how the textual content of a process model and its activity labels can be systematically analyzed. It is a major challenge...

    Provided By Humboldt-Universitat zu Berlin