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  • 2851.
    Zacarias, Orlando P.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Eduardo Mondlane University (UEM).
    Mining Mozambique Health Data: The Case of Malaria: From Bayesian Incidence Risk to Incidence Case Predictions2015Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The health sector in Mozambique is piled with data, holding records of major public health diseases, such as malaria, cholera, etc. The process of scrutinizing such a mass of health data for useful information is challenging but essential for the health authorities and professionals. Statistical learning and inferential approaches can be used to provide health decision makers with appropriate tools for disease diagnosis and assessment, where the analysis is performed using Bayesian predictive techniques and data mining. The purpose of this thesis is to investigate how predictive data mining and Bayesian regression methods can be used effectively, so as to extract useful knowledge from reported malaria health data to support decision making and management. 

    In summary, effective Bayesian predictive methods based on spatial and space-time reported cases of malaria have been derived, allowing the extraction of the main risk factors for malaria. Predictive models that combine consecutive temporal connections within the analysis of the space-time variations of the disease have been found to be relevant when the explicit modeling of seasonality is not required or is even unfeasible.

    Investigation of the most effective ways to derive numerical predictive models was performed using several regression predictive methods. The conclusions are that effective numerical prediction of new cases of the disease can be achieved by training support vector machines using a time-window approach for the choice of different training sets based on a number of years and reducing the time towards the test set. The best performance is obtained for a smaller time-window. Another contribution of this thesis is the determining of the importance of predictors in the prediction of the incidence of malaria, performed by adopting the permutation accuracy strategy (from the random forests method) using the test set. Also, an additional contribution relates to a significant reduction in the predictive error, which has been obtained by the employment of a sample correction bias strategy, while testing the predictive models in different regions, other than where they were initially developed.

  • 2852.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Eduardo Mondlane University, Moçambique.
    Andersson, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Matematiska institutionen.
    Mapping malaria incidence distribution that accounts for environmental factors in Maputo Province - Mozambique2010Ingår i: Malaria Journal, ISSN 1475-2875, E-ISSN 1475-2875, Vol. 9, 79Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: The objective was to study if an association exists between the incidence of malaria and some weather parameters in tropical Maputo province, Mozambique. Methods: A Bayesian hierarchical model to malaria count data aggregated at district level over a two years period is formulated. This model made it possible to account for spatial area variations. The model was extended to include environmental covariates temperature and rainfall. Study period was then divided into two climate conditions: rainy and dry seasons. The incidences of malaria between the two seasons were compared. Parameter estimation and inference were carried out using MCMC simulation techniques based on Poisson variation. Model comparisons are made using DIC. Results: For winter season, in 2001 the temperature covariate with estimated value of -8.88 shows no association to malaria incidence. In year 2002, the parameter estimation of the same covariate resulted in 5.498 of positive level of association. In both years rainfall covariate determines no dependency to malaria incidence. Malaria transmission is higher in wet season with both covariates positively related to malaria with posterior means 1.99 and 2.83 in year 2001. For 2002 only temperature is associated to malaria incidence with estimated value 2.23. Conclusions: The incidence of malaria in year 2001, presents an independent spatial pattern for temperature in summer and for rainfall in winter seasons respectively. In year 2002 temperature determines the spatial pattern of malaria incidence in the region. Temperature influences the model in cases where both covariates are introduced in winter and summer season. Its influence is extended to the summer model with temperature covariate only. It is reasonable to state that with the occurrence of high temperatures, malaria incidence had certainly escalated in this year.

  • 2853.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Eduardo Mondlane University, Mozambique.
    Andersson, Mikael
    Stockholms universitet, Naturvetenskapliga fakulteten, Matematiska institutionen.
    Spatial and temporal patterns of malaria incidence in Mozambique2011Ingår i: Malaria Journal, ISSN 1475-2875, E-ISSN 1475-2875, Vol. 10, 189Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: The objective of this study is to analyze the spatial and temporal patterns of malaria incidence as to determine the means by which climatic factors such as temperature, rainfall and humidity affect its distribution in Maputo province, Mozambique. Methods: This study presents a model of malaria that evolves in space and time in Maputo province-Mozambique, over a ten years period (1999-2008). The model incorporates malaria cases and their relation to environmental variables. Due to incompleteness of climatic data, a multiple imputation technique is employed. Additionally, the whole province is interpolated through a Gaussian process. This method overcomes the misalignment problem of environmental variables (available at meteorological stations points) and malaria cases (available as aggregates for every district - area). Markov Chain Monte Carlo (MCMC) methods are used to obtain posterior inference and Deviance Information Criteria (DIC) to perform model comparison. Results: A Bayesian model with interaction terms was found to be the best fitted model. Malaria incidence was associated to humidity and maximum temperature. Malaria risk increased with maximum temperature over 28 degrees C (relative risk (RR) of 0.0060 and 95% Bayesian credible interval (CI) of 0.00033-0.0095) and humidity (relative risk (RR) of 0.00741 and 95% Bayesian CI 0.005141-0.0093). The results would suggest that additional non-climatic factors including socio-economic status, elevation, etc. also influence malaria transmission in Mozambique. Conclusions: These results demonstrate the potential of climate predictors particularly, humidity and maximum temperature in explaining malaria incidence risk for the studied period in Maputo province. Smoothed maps obtained as monthly average of malaria incidence allowed to visualize months of initial and peak transmission. They also illustrate a variation on malaria incidence risk that might not be related to climatic factors. However, these factors are still determinant for malaria transmission and intensity in the region.

  • 2854.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Eduardo Mondlane University, Mozambique.
    Boström, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Comparing Support Vector Regression and Random Forests for Predicting Malaria Incidence in Mozambique2013Ingår i: 2013 International Conference on Advances in ICT for Emerging Regions (ICTer), IEEE Computer Society, 2013, 217-221 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Accurate prediction of malaria incidence is essentialfor the management of several activities in the ministry of health in Mozambique. This study investigates the comparison ofsupport vector machines (SVMs) and random forests (RFs) forthis purpose. A dataset with records of malaria cases covering theperiod 1999-2008 was used to evaluate predictive models on thelast year when developed from one up to nine years of historicaldata. Mean squared error (MSE) was used as performancemetric. The scheme for estimating variable importance commonlyemployed for RFs was also adopted for SVMs. SVMs developedfrom two year of historical data obtained the best predictionaccuracy. Hence, if we are interested in predicting the actualnumber of malaria cases the support vector machines modelshould be chosen. In the analysis of variable importance, IndoorResidual Spray (IRS), the districts of Manhiça and Matola andmonth of January turned out to be the most important predictorsin both the SVM and RF models.

  • 2855.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Eduardo Mondlane University, Mozambique .
    Boström, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Generalization of Malaria Incidence Prediction Models by Correcting Sample Selection Bias2013Ingår i: Advanced Data Mining and Applications: Proceedings, Part II / [ed] Hiroshi Motoda et al., Springer Berlin/Heidelberg, 2013, 189-200 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Performance measurements obtained from dividing a single sample into training and test sets, e.g. by employing cross-validation, may not give an accurate picture of the performance of any model developed from the sample, on the set of examples to which the model will be applied. Such measurements, which are due to that training and test samples are drawn according to different distributions may hence be misleading. In this study, two support vector machine models for predicting malaria incidence developed from certain regions and time periods in Mozambique are evaluated on data from novel regions and time periods, and the use of selection bias correction is investigated. It is observed that significant reductions in the predicted error can be obtained using the latter approach, strongly suggesting that techniques of this kind should be employed if test data can be expected to be drawn from some other distribution than what is the origin of the training data.

  • 2856.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Boström, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Predicting the Incidence of Malaria Cases in Mozambique Using Regression Trees and Forests2013Ingår i: International Journal of Computer Science and Electronics Engineering (IJCSEE), ISSN 2320-401X, Vol. 1, nr 1, 50-54 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Malaria remains a significant public health concern in Mozambique with disease cases reported in almost every province. This study investigates the prediction models of the number of malaria cases in districts of Maputo province. Used data include administrative districts, malaria cases, indoor residual spray and climatic variables temperature, rainfall and humidity. Regression trees and random forest models were developed using the statistical tool R, and applied to predict the number of malaria cases during one year, based on observations from preceding years. Models were compared with respect to the mean squared error (MSE) and correlation coefficient. Indoor Residual Spray (IRS), month of January, minimal temperature and rainfall variables were found to be the most important factors when predicting the number of malaria cases, with some districts showing high malaria incidence. Additionally, by reducing the time window for what historical data to take into account, predictive performance can be increased substantially.

  • 2857.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Boström, Henrik
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Strengthening the Health Information System in Mozambique through Malaria Incidence Prediction2013Ingår i: IST-Africa 2013 Conference Proceedings / [ed] Paul Cunningham, Miriam Cunningham, IEEE Computer Society, 2013, 1-7 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Malaria is one of the principal health problems in Mozambique, affecting mostly children. The prediction of accurate future incidence cases is crucial for the implementation of appropriate policies of intervention and disease control in order to strengthen the health system. We propose a model based on support vector machines (SVM) for predicting yearly malaria incidence cases for children 0-4 years of age in the Maputo province, Mozambique. The predictive model is trained on two years of historical malaria data in combination with climatic and malaria control factors. A grid optimization parameter tuning procedure was firstly employed to detect the best parameters and select the kernel. In order to determine the most influential factors, variable importance was calculated through estimating the impact of permuting feature values on the predictive performance. The most important malaria incidence predictors turned out to be temperature variation, followed by Matutuine (district), April (month) and Namaacha (district).

  • 2858.
    Zacarias, Orlando P.
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Eduardo Mondlane University, Mozambique .
    Majlender, Peter
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Comparison of infant malaria incidence in districts of Maputo province, Mozambique2011Ingår i: Malaria Journal, ISSN 1475-2875, E-ISSN 1475-2875, Vol. 10, 93Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Malaria is one of the principal health problems in Mozambique, representing 48% of total external consultations and 63% of paediatric hospital admissions in rural and general hospitals with 26.7% of total mortality. Plasmodium falciparum is responsible for 90% of all infections being also the species associated with most severe cases. The aim of this study was to identify zones of high malaria risk, showing their spatially and temporal pattern. Methods: Space and time Poison model for the analysis of malaria data is proposed. This model allows for the inclusion of environmental factors: rainfall, temperature and humidity as predictor variables. Modelling and inference use the fully Bayesian approach via Markov Chain Monte Carlo (MCMC) simulation techniques. The methodology is applied to analyse paediatric data arising from districts of Maputo province, Mozambique, between 2007 and 2008. Results: Malaria incidence risk is greater for children in districts of Manhica, Matola and Magude. Rainfall and humidity are significant predictors of malaria incidence. The risk increased with rainfall (relative risk - RR: .006761, 95% interval: .001874, .01304), and humidity (RR: .049, 95% interval: .03048, .06531). Malaria incidence was found to be independent of temperature. Conclusions: The model revealed a spatial and temporal pattern of malaria incidence. These patterns were found to exhibit a stable malaria transmission in most non-coastal districts. The findings may be useful for malaria control, planning and management.

  • 2859. Zangouei, Farnaz
    et al.
    Babazadeh Gashti, Mohammad Ali
    Höök, Kristina
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Tijs, Tim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    de Vries, Gert-Jan
    Westerink, Joyce
    How to Stay in the Emotional Rollercoaster: Lessons Learnt from Designing EmRoll2010Ingår i: NordiCHI, ACM Press , 2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    Bodily expressions can be used to involve players in intense experiences with games. By physically moving, breathing, or increasing your pulse, you may start emotional processes that help create for a stronger experience of the narrative in the game. We have designed a system named EmRoll that poses riddles to pairs of players. The riddles can only be solved if the players are, or at least pretend to be, moving according to different emotional states: dancing happily, relaxed breathing and being scared. The system measures movement, breathing and sweat reactions from the two players. Lessons learnt were: playing in pairs is an impor- tant aspect as the two players influenced one-another, pull- ing each other into stronger experiences; getting excited through intense movement when involving your whole body worked well, as did relaxing through deep breathing; using the sweat response as an input mechanism worked less well; and finally, putting a Wizard (a human operator) into the loop can help bootstrap difficulty balancing and thereby increase emotional involvement.
  • 2860.
    Zarmpou, Theodora
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Dalianis, Hercules
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Vlachopoulou, Maro
    Data Migration Between Web Content Management Systems2009Ingår i: 4th Mediterranean Conference on Information Systems, MCIS 2009, 2009Konferensbidrag (Refereegranskat)
  • 2861. Zary, Nabil
    et al.
    Johnsson, Gunillla
    Fors, Uno G. H.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Impact of the virtual patient introduction on the clinical reasoning process in dental education2012Ingår i: Bio-Algorithms and Med-Systems, ISSN 1895-9091, Vol. 8Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background In the Virtual patient system Web-SP, the case authoring is entirely delegated to faculty. An analysis of the virtual patients (VPs) authored by faculty showed that the most common practice chosen by the case authors was to provide an introductory clinical vignette including rich anamnestic data. To evaluate the influence of the vignette, a controlled trial was conducted to determine if the absence of vignette would influence the students' therapeutic decisions and their clinical reasoning. Methods This double blind controlled trial randomized 57 fourth year dentistry students into two groups. Two virtual patient cases were created with the same content in both groups, but the VPs encountered by the intervention group lacked the introductory vignette. The therapy decisions and the history taking activity were scored and analysed by the course director. A stratified analysis was undertaken, stratifying by day. Results There were no statistically significant differences between the two groups with respect to their therapeutic decision scores (p=.16). Participants in both groups were equivalent with respect to the number of relevant medical history questions asked (p=.33) and the number of irrelevant questions asked (p=.20) Conclusions This study indicates that vignettes did not have an impact on students' clinical reasoning process. The use of detailed vignettes or case introductions might not be needed. A possible reason includes students' prior exposure for a full semester to other VPs for course work and clinical reasoning. Perhaps the intervention was too subtle to impact on learners at this stage of development. Clinical vignettes might have more impact at earlier stages of student learning such as early in the semester but not as preparation for final exam. The limited number of participants may have concealed differences between the groups. We also need to investigate if the one-hour limit given the students might influence the therapeutic decisions.

  • 2862.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ilayperuma, Tharaka
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A Model-driven Approach for Designing E-Services Using Business Ontological Frameworks2010Ingår i: Fourteenth IEEE International EDOC Conference (EDOC 2010), IEEE Computer Society , 2010, nr 2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    A constant goal of enterprises of all sizes is to align their business with IT. The major concern is to design the technology to support the desired performance goals and business values. In e-business collaborations, services are becoming the cornerstones for modeling the offerings of the involved parties. However, business concepts, like value offerings, typically cannot be linked to technology levels, such as SOA and Web services. Business value models, formulated in terms of economic values, have been recognized as the basis for eliciting the actors in a business scenario and their relationships. Recently, several business ontological frameworks have been proposed to facilitate the design of business value models. Aiming towards an MDA-aligned approach, in our study we consider business value models for creating a service-centric Computational Independent Model (CIM). By utilizing well-defined mappings, the model is further transformed into a UML-based system model at the Platform Independent Model (PIM) level, capturing both the static and behavioral specifications of elicited e-services.
  • 2863.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ilayperuma, Tharaka
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Exploring REA and Open-edi Business Frameworks for Service Modeling2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    Contemporary business collaborations foster enterprises to make their offerings available to partners and consumers as e-services. In this setting, high-level enterprise models, such as business models, provide an economically aware perspective for elicitation of business services, and thereby, e-services. Recently, REA and Open-edi business frameworks have been jointly considered to provide the Open-edi Business Transaction Ontology (OeBTO) for exploring concepts, relationships and actors involved in business collaborations. In this study, we use these frameworks and supporting architectures to propose a service-centric business model. From a model-based development perspective, the model that we propose is intended to be transformed to a system-centric service model, and further to Web service specifications and coordinations. The purpose of this study is primarily aimed toward an explorative and business-founded identification of services. An example from the insurance business sector is used to argument the way we ground and apply our proposed method.
  • 2864.
    Zdravkovic, Jelena
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Concepts of Flexibility for Efficient Integration of B2B Processes2004Ingår i: Proceedings of the International Workshop on Modelling Inter-Organizational Systems (MIOS’04), with CooPIS04, 2004, Vol. 3292, nr 2004Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    Business-to-Business (B2B) e-commerce is emerging as trading parties are attempting to integrate electronically, to automate exchange of their services. To be able to collaborate, enterprise processes must expose compatible public behavior. It is a common need for a company to collaborate a business with many partners. A problem is that, even agreeing on information to be exchanged, the partners usually expose different requirements for protocol and logic of interactions. Therefore, it becomes necessary for companies to redesign process models to accommodate to a new partner. As the result, the company must engage considerable resources for designing and verifying new process specifications, as well as for maintaining them. In this paper, we propose a framework for flexible modeling of enterprise processes, to support a larger scale of B2B integrations. The proposal is based on a set of concepts of flexibility that enable partial process specifications, depicting thus a wider scope of business scenarios that a company is willing to conform in a B2B context. The complete process specification is made after B2B parties agree on a strict public protocol and enforced by runtime transformations. The proposed framework for flexible process modeling is aimed to speed up integration of partner processes as it increases ability for process matching without requiring changes in their design.
  • 2865.
    Zdravkovic, Jelena
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Service-based Processes2004Rapport (Övrigt vetenskapligt)
  • 2866.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Giannoulis, Constantinos
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Svee, Eric-Oluf
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Using i* to Capture Consumer Preferences as Requirements for Software Product Lines2013Ingår i: iStar 20136th International i* Workshop: Proceedings of the 6th International i* Workshop 2013 / [ed] Jaelson Castro, Jennifer Horkoff, Neil Maiden, Eric Yu, 2013, 97-102 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    The need for software to fit to diversity of numerous consumers has become a norm. Furthermore, technology innovations stimulate the growth of such software, thus making it even more available and appealing to consumers. Although how economic values relate and influence IT systems is an area that has been addressed, it is not clear whether and how consumer values do so. To address this challenge, this study aims to using i* establish a link between preferences of consumers and system requirements for Software Product Line (SPL) as a seamless way for systematically realizing variations. The presented results are grounded in an empirical study related to the development of a system for Online Education.

  • 2867.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Henkel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Flexible Integration of Business and Technology Using Service-Based Processes2005Ingår i: Proceedings of the 6th BPMDS Workshop. CAiSE’05, 2005, Vol. 1, nr 2005Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    When designing executable enterprise processes the assumption of a transparent integration with existing systems is unrealistic. These systems, represented by software services, may impose various constraints. Using a process description framework, in this paper we examine how the design of executable business processes is affected by technical issues. Furthermore, we examine rules to which system designers should adhere to when designing services, to enable a larger scope of “as-is” realizations of business processes.
  • 2868.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Henkel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Flexible Realizations of Business Processes Using Existing Services2006Ingår i: The 8th International Conference on Enterprise Information Systems (ICEIS'06), Paphos, Cyprus, 2006Konferensbidrag (Refereegranskat)
  • 2869.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Henkel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Moving from Business to Technology using Service-based Processes2005Ingår i: IEEE Internet Computing, ISSN 1089-7801, E-ISSN 1941-0131, Vol. 9, nr 3, 73-81 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In most organizations, business process realizations must be aligned with existing systems, which can impose specific requirements. Currently, however, there is no way to track the alignment between business processes and corresponding technical implementations. The authors' proposed framework offers a systematic way to classify and assess technical realizations of business processes.

  • 2870.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ilayperuma, Tharaka
    Designing consumer-aligned services using business value modelling2012Ingår i: International Journal of Organisational Design and Engineering (IJODE), ISSN 1758-9797, Vol. 2, nr 3, 317-342 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Given the dominance of service industries in today's economy, service improvement and innovation have become major concerns of many enterprises. To address these challenges, the service design should start at the business level at which services can be identified to provide values in an economically viable way by satisfying consumers' preferences for quality aspects. However, high-level business concepts, like value offerings, are hardly linked to technology levels, such as SOA and web services. Relying on the model driven development (MDD) and ontology paradigms, the paper proposes a method that uses business value models to elicit and structure business services from a consumer-centric quality perspective and transforming the business service model further to a web service model. To facilitate major MDD aspects, such as semantic-level descriptions and automated transformations, these models are designed as ontologies. A case study from the Swedish eye-care health sector is used to ground the presented method.

  • 2871.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ilayperuma, Tharaka
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Exploring value business models for e-service design2010Ingår i: Model-driven domain analysis and software development: architectures and functions / [ed] Janis Osis and Erika Asnina, Hershey: IGI Global, 2010, nr 2009, 232-253 s.Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    Contemporary enterprises face strong pressures to increase competitiveness by engaging in alliances of several kinds. In a rapidly increasing degree, traditional organizational structures evolve towards online business using modern ICT – such as the Internet, semantic standards, process- and service-oriented architectures. For efficient applications of inter-organizational information systems, the alignment between business and ICT is a key factor. At the ICT level, Web services are used as the cornerstones for modeling the interaction points of Web applications. So far, development of Web services has focused on a technical perspective, such as the development of standards for message exchanges and service coordination. Thereby, business concepts, such as economic values exchanged among the cooperating actors, cannot be traced in Web service specifications. As a consequence, business and ICT models become difficult to keep aligned. To address this issue, we propose a MDA-based approach for design of software services which may be implemented using Web services and Web service coordinations. The proposal focuses on a value-explorative analysis and modeling of business services at the CIM level, and model transformations using UML 2 to the PIM level, by utilizing well-defined mappings.

  • 2872.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cooperation of Processes through Message Level Agreement2004Ingår i: Proceedings of the 16th International Conference on Advanced Information Systems Engineering (CAiSE’04), 2004, Vol. 3084, nr 2004Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    E-Business is constantly growing as organizations are trying to inte-grate electronically in order to automate exchange of information, goods and services. To construct inter-organizational processes, the involved enterprise processes have to be able to integrate their services directly, or by use of busi-ness-to-business interaction standards. A problem is that existing processes are so diverse in protocols, activity and message forms that it is impossible to start collaboration without comprehensive adaptations. In this paper, we propose a framework for interoperation of processes, which is based on requirements for equivalence of document exchanges. We argue that this level of equivalence is sufficient to enable existing enterprise processes to collaborate without internal redesign. The proposed framework is aimed to facilitate process collaboration by using a mediator layer to perform necessary adaptations, while minimizing requirements for process similarity.
  • 2873.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Henkel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Service-Based Processes: Design for Business and Technology2004Ingår i: In: the ACM Proceedings of the Second International Conference on Service Oriented Computing (ICSOC 2004), 2004, nr 2004Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    Composition of software services is a fundamental part in supporting enterprise business processes. Designed properly, executable processes can be used to closely support business processes by the integration of existing software services. In order to support business processes the design of the executable process must closely follow the business events and activities, as perceived by business actors. However, the design must also consider technical issues such as limitations in existing technology and systems. In this paper we examine how technical system constraints influence the realization of business processes. Based on this examination we present a set of realization types that describes the transformation from a business process into its realization as an executable process. We also propose design criteria that need to be adhered to in order to cater to both business and technical needs.
  • 2874.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kabilan, Vandana
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Using Multi-Tier Contract Ontology to deduce Contract Workflow Model for Enterprise Interoperability2005Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    Ontologies are being proposed as a medium for affecting enterprise application integration. Though it is widely accepted that ontologies can support inter- enterprise interoperability, the exact nature and extent to which ontology may be useful is uncertain. We promote the use of ontology in a two-fold way: first, as a knowledge base for fostering human-to-human shared understanding; second, as ‘Interlingua’ for promoting human-to-machine as well as semantics-to-execution specification. The proposed concept is described using a case scenario in the realm of legal business contracts, followed by their integration to the business domain, with an objective to model contract compliant business process models. With the case, we illustrate the use of Multi-Tier Contract Ontology (MTCO) to deduce a high level, partial business process model named the Contract Workflow Model (CWM). Such a model, from the business process perspective, may be used as a skeleton for designing internal business processes for each individual contracting party, or for mapping to existing processes.
  • 2875.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kabilan, Vandana
    Contract-based Exception Handling Process Patterns2008Ingår i: Proceedings of the 7th International Conference on Information Systems and its Applications (ISTA 2008), Springer , 2008, Vol. 5Konferensbidrag (Refereegranskat)
  • 2876.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kabilan, Vandana
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Enabling Business Process Interoperability Using Contract Workflow Models2005Ingår i: 13th International Conference on Cooperative Systems (CooPIS05), 2005, Vol. 3760Konferensbidrag (Refereegranskat)
  • 2877.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kirikova, MariteJohannesson, PaulStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Advanced Information Systems Engineering: 27th International Conference, CAiSE 2015, Stockholm, Sweden, June 8-12, 2015, Proceedings2015Samlingsverk (redaktörskap) (Refereegranskat)
    Abstract [en]

    This book constitutes the proceedings of the 27th International Conference on Advanced Information Systems Engineering, CAiSE 2015, held in Stockholm, Sweden, in June 2015.

    The 31 papers presented in this volume were carefully reviewed and selected from 236 submissions. They were organized in topical sections named: social and collaborative computing; business process modeling and languages; high volume and complex information management; requirements elicitation and management; enterprise data management; model conceptualisation and evolution; process mining, monitoring and predicting; intra- and inter-organizational process engineering; process compliance and alignment; enterprise IT integration and management; and service science and computing. The book also contains the abstracts of 3 keynote speeches and 5 tutorials, presented at the conference.

  • 2878.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kirikova, Marite
    Johannesson, Paul
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Preface to CAISE 20152016Ingår i: Information Systems, ISSN 0306-4379, E-ISSN 1873-6076, Vol. 62Artikel i tidskrift (Övrigt vetenskapligt)
  • 2879.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Pastor, Oscar
    Loucopoulos, Pericles
    On the Capability Notion in Business Informatics: [Opening]2014Ingår i: [Proceedings of] The 1st International Workshop on Capability-oriented Business Informatics (CoBI 2014) / [ed] Jelena Zdravkovic, Peri Loucopoulos, Oscar Pastor, 2014, 1-2 s.Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The business environments of today are changing rapidly, entailing complex anddynamic organizational constellations. Enterprises operating in these conditions needto have the capability to deliver their services in a variety of business contexts withsustainable quality and moreover to leverage them to competitive advantage. Latelythe notion of capability has gained a growing attention, due to a number of factors:the notion directs business investment focus, it can be used as a baseline for businessplanning, and it leads directly to service specification and design.

  • 2880.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rychkova, Irina
    Speckert, Thomas
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Requirements for IT Governance in Organizations Experiencing Decentralization2015Ingår i: Information Systems Engineering in Complex Environments: CAiSE Forum 2014, Thessaloniki, Greece, June 16-20, 2014, Selected Extended Papers / [ed] Selmin Nurkan, Elias Pimenidis, Springer, 2015, 269-285 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Decentralization of organizations and subsequent change of their management and operation styles requires changes in organization’s processes and heavily involves the IT. A case study in the Higher Education sector in Sweden has shown that Enterprise Architecture (EA) frameworks fit to primarily centralized organizational structures, and as such have shortcomings when used in decentralized organizations. Overcoming these deficiencies requires some new principles to be introduced and incorporated into the EA knowledge. In particular for IT governance, the case study showed that the peer-to-peer principles, such as peer production, can offer more suitable governance over current EA frameworks as they are able to better match the decentralized components of the university’s organizational structure.

  • 2881.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Grabis, Janis
    A Comparative Analysis of Using the Capability Notion for Congruent Business and Information Systems Engineering2017Ingår i: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, nr 10, 1-20 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The notion of capability has been gaining a growing attention in the business and information system (IS) engineering community due to a number of reasons: it facilitates focus on business investments, it can be used as a baseline for business planning, and it directly leads to service specification and design. It is not however widely known to what extent capability is considered in different modeling approaches, how it is defined, and what purpose it fulfills. This article analyzes how the notion of capability is included in the frameworks spanning from business-oriented such as Business Architecture and Business Value Modeling, to the alignment-oriented represented by Enterprise Architecture (EA), and Enterprise Modeling (EM). The results of the analysis have shown that capability has widespread presence in the frameworks and that its conceptual meaning is largely similar, while the intentions and the mechanisms of its use differ, which raises stimulating opportunities for new contributions and improvements in the field.

  • 2882.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Henkel, Martin
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Grabis, Janis
    Modelling Business Capabilities and Context Dependent Delivery by Cloud Service2013Ingår i: Advanced Information Systems Engineering: Proceedings / [ed] Camille Salinesi, Moira C. Norrie, Óscar Pastor, Springer Berlin/Heidelberg, 2013, 369-383 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Contemporary business environments are changing rapidly, organizations are global, and cloud-based services have become a norm. Enterprises operating in these conditions need to have the capability to deliver their business in a variety of business contexts. Capability delivery thus has to be monitored and adjusted. Current Enterprise Modeling approaches do not address context-dependent capability design and do not explicitly support runtime adjustments. To address this challenge, a capability-driven approach is proposed to model business capabilities by using EM techniques, and to use model-based patterns to describe how software applications can adhere to changes in the execution context. A meta-model for capability design and delivery is presented with the consideration to delivering solutions as cloud services. The proposal is illustrated with an example case from an energy efficiency project. A supporting architecture for the capability development and the delivery in the cloud is also presented.

  • 2883.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kirikova, Marite
    Karagiannis, Dimitri
    Winter, Robert
    Advanced Enterprise Modeling: Editorial2015Ingår i: Business & Information Systems Engineering, ISSN 1867-0202, Vol. 57, nr 1, 1-2 s.Artikel i tidskrift (Övrigt vetenskapligt)
  • 2884.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, JanisStockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.Kirikova, MariteKaragiannis, DimitrisWinter, Robert
    Advanced Enterprise Modeling2015Samlingsverk (redaktörskap) (Refereegranskat)
  • 2885.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kirikova, Marite
    Karagiannis, Dimitris
    Winter, Robert
    BISE – Call for Papers Issue 1/20152013Ingår i: Business & Information Systems Engineering, ISSN 1867-0202, Vol. 5, nr 5, 361-361 s.Artikel i tidskrift (Refereegranskat)
  • 2886.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Stirna, Janis
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kuhr, Jan-Christian
    Koç, Hasan
    Requirements Engineering for Capability Driven Development2014Ingår i: The Practice of Enterprise Modeling: 7th IFIP WG 8.1 Working Conference, PoEM 2014, Manchester, UK, November 12-13, 2014: proceedings / [ed] Ulrich Frank, Berlin: Springer, 2014, Vol. 197, 193-207 s.Konferensbidrag (Refereegranskat)
    Abstract [en]

    Lately, the notion of capability has emerged in IS engineering as an instrument to context dependent design and delivery of business services. Representing core business functionalities of an organization, capabilities, and capability driven IS development can be seen as both – a shift beyond and complement to the widely established service-oriented engineering paradigm where needs of customers form the leading modeling and design perspective. To ensure the needs of business stakeholders for variety of business contexts that an organization faces, and thus facilitate successful systems delivery, capability-driven development needs a well-defined method for requirements engineering, as well as its confirmation in practices. In this paper a process for specifying requirements capabilities and their designs is proposed. An application of the proposed approach to the area of Business Process Outsourcing (BPO) services. is carried out for the German company SIV.

  • 2887.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Svee, Eric-Oluf
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Giannoulis, Constantinos
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Capturing consumer preferences as requirements for software product lines2015Ingår i: Requirements Engineering, ISSN 0947-3602, E-ISSN 1432-010X, Vol. 20, nr 1, 71-90 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Delivering great consumer experiences in competitive market conditions requires software vendors to move away from traditional modes of thinking to an outside- in perspective, one that shifts their business to becoming consumer-centric. Requirements engineers operating in these conditions thus need new means to both capture real preferences of consumers and then relate them to requirements for software customized in different ways to fit anyone. Additionally, because system development models require inputs that are more concrete than abstract, the indistinct values of consumers need to be classified and formalized. To address this challenge, this study aims to establish a conceptual link between preferences of consumers and system requirements, using software product line (SPL) as a means for systematically accommodating the variations within the preferences. The novelty of this study is a conceptual model of consumer preference, which integrates generic value frameworks from both psychology and marketing, and a method for its transformation to requirements for SPL using a goal-oriented RE framework as the mediator. The presented artifacts are grounded in an empirical study related to the development of a system for online education.

  • 2888.
    Zdravkovic, Jelena
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Zikra, Iyad
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Ilayperuma, Tharaka
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    An MDA Method for Service Modeling by Formalizing REA and Open-edi Business Frameworks with SBVR2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    Business frameworks offer great opportunities of communication between people for working on the enterprise system engineering processes, as well as for eliciting services that the enterprise can offer in collaboration contexts. However, these kinds of frameworks, such as Resource-Event-Agent and Open-edi, recently unified in Open-edi Business Ontology (OeBTO), lack formal representations. This fact considerably limits their use in system development, particularly in model-driven development methods where the efficiency of transformations is of great importance. In this paper we suggest a formalization of OeBTO using OMG’s standard Semantics of Business Vocabulary and Business Rules (SBVR), as a method for creating a service-centric business model. This makes it possible to provide the necessary formal logic foundation to allow automatic processing of the business model and its transformation to a system-level service model. An example from the bank loan business sector is used to argument the application of the method.

  • 2889.
    Zeynep, Ahmet
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Holmquist, Lars Erik
    Sharing mobile services - Beyond the app store model2010Ingår i: MobileHCI 2010, ACM Press , 2010Konferensbidrag (Övrigt vetenskapligt)
  • 2890.
    Zeynep, Ahmet
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Jonsson, Martin
    Holmquist, Lars Erik
    Sumon, Saiful Islam
    Supporting embodied exploration of physical concepts in mixed digital and physical interactive settings2011Ingår i: TEI 2011, ACM Press , 2011Konferensbidrag (Övrigt vetenskapligt)
  • 2891.
    Zeynep, Ahmet
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Cramer, Henriette
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Holmquist, Lars Erik
    SICS / Mobile Life, , .
    Rost, Mattias
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Gamification and location-sharing: Some emerging social conflicts2011Ingår i: CHI2011, Vancouver, Canada: ACM Press , 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Location-sharing services such as foursquare are a prominent example of commercial apps that use gamification to increase user engagement. These gamification elements however have to coexist with a plethora of usage motivations. We here present selected observations on emerging conflicts between gamification elements and other usage motivations for location-sharing. We argue gamification needs to take into account the social context in which services operate and that conflicts within this context can both be detrimental and add to playfulness.

  • 2892.
    Zeynep, Ahmet
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Väänänen-Vainio Mattila, Kaisa
    Tampere University of Technology, , .
    Face to face makes a difference: Recommendation Practices of Users of Mobile Services2011Ingår i: UbiComp2011, Beijing, China: ACM Press , 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The mobile app stores and markets provide companies, independent developers and researchers alike with possibilities to distribute innovative designs for mobile devices on a global scale. However, reaching a large numbers of users does not in itself ensure a large number of users adopting the mobile application or service. Large-scale adoption depends on additional factors such as novelty in service design, ease of use, enjoyable interaction, built-in mechanisms for further distribution of the mobile service as well as the practice of word-of-mouth recommendations. In this position paper we present the background and preliminary findings from a study aimed at investigating the motivations and practices by which users recommend mobile apps and services among their acquaintances. We discuss our perspective on distribution of mobile applications and services on a large scale and end this paper by suggesting questions for discussion and future research.

  • 2893. Zhang, Ji-hong
    et al.
    Chen, Xi
    Ding, Xiao-song
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Beijing Foreign Studies University, China.
    Degeneracy removal in cutting plane methods for disjoint bilinear programming2017Ingår i: Optimization Letters, ISSN 1862-4472, E-ISSN 1862-4480, Vol. 11, nr 3, 483-495 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Disjoint bilinear programming has appeared in miscellaneous practical applications. Although deterministic approaches such as cutting plane methods for solving it have been proposed, the frequently encountered computational problem regarding degeneracy still remains. This paper proposes a distance-following approach in order to generate a conservative hyperplane from a degenerate local star minimizer located by the augmented mountain climbing procedure, cut off it, and thus enable a cutting plane method to proceed without too much additional computational workload.

  • 2894. Zhang, Pengyi
    et al.
    Liu, Chang
    Hansen, Preben
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    I Need More Time!: The Influence of Native Language on Search Behavior and Experience2016Ingår i: Working Notes of CLEF 2016 - Conference and Labs of the Evaluation forum: CEUR Proceedings / [ed] Krisztian Balog, Linda Cappellato, Nicola Ferro, Craig Macdonald, 2016, 1166-1182 s.Konferensbidrag (Refereegranskat)
  • 2895.
    Zhang, Xiaoxi
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    An experiment with random stories in pervasive games2008Studentuppsats (Examensarbete)
    Abstract [en]
    In this thesis, we investigate a model for interactive story telling based on which stories are generated randomly. We discuss whether it is fun to read a story in random order and whether this can be used in a pervasive game. Moreover, in order to prove the theoretical discussions, we present a new game - Shards – which is a pervasive game based on random storytelling. Storytelling is a very traditional activity, as are games. Sometimes people connect the two together, making storytelling into a playful activity. Examples of playful storytelling include many formats, such as random writing or multi-author storytelling, interactive storytelling and adventure games. In this thesis, we discuss the playful possibilities offered by reading stories in random order, the different kinds of stories that fit this reading mode, the possible forms to play with it, and finally present an authoring tool for such stories. To illustrate this idea, we present a new game, Shards. Literally, “Shards” means pieces or fragments. Here, the name refers to the pieces of stories we play with. In this game, the player tries to complete one story line. Every time he or she comes close to another participant, a new shard can be retrieved, until the story is finished or the player stops playing the game. ‘Shards’ requires stories that are written to be read in random order. The first part of the thesis investigates which kinds of stories are best suited for shards. From a brainstorming session, we obtained four stories in the form of Shards. The four stories are very different and offer different reading experiences when read randomly. Based on the initial idea of this game, one story was chosen as a model story to develop the game and the authoring system for the game. One conclusion we can draw from the brainstorming session is that certain story themes are better suited for this game than others. For example, crime stories would fit well with the game structure. The second part of the thesis describes two authoring tools that support story writers in generating stories for shards. The tools were implemented using Ruby for basic reading tools and TCL/TK for more advanced functionality. Both are web-based tools and were used by the author to maintain the story database. The basic tools allow for CRED (create, read, edit, delete, a standard of database operation), and the more advanced tools allow for VADE (view, add, delete, edit, a standard) with “read” but without “delete” and “edit”. The basic tool, using Ruby, is intended for backend service management, and the more advanced tool, using TCL/TK, draws a graphic interface for the end user. The final part of the thesis describes a brief user evaluation of the game and evaluates the authoring tools. Four people participated in this evaluation. They found that Shards was a fun game with a well-designed story. This shows that it is possible to create a game out of random story reading, and also that the authoring tool is usable as a tool to create such stories. In all, this thesis is about the first trying of random story reading, random story writing and the early stage of the pervasive game Shards.
  • 2896.
    Zhang, Yanqing
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Constructing Swedish Fashion Identity Exhibition Review: Svenskt Mode (Swedish Fashion): 2000–2015, Sven-Harry’s Art Museum, Stockholm, May 23–August 31, 20142015Ingår i: Fashion theory, ISSN 1362-704X, E-ISSN 1751-7419Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This is an exhibition review article. It describes the goal, the curatorship, display and exhibited objects. The exhibition focuses on Swedish fashion design and treats fashion as something in relation to art. It analyzes the exhibition as part of institutionalization of Swedish fashion system. Understanding fashion as a system rather than material clothing is the key point here.

  • 2897.
    Zhang, Yanqing
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Tech Fashion: Fashion Institutionalization in Digital Technology2016Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    This thesis explores aesthetization in general and fashion in particular in digital technology design and how we can design digital technology to account for the extended influences of fashion. The thesis applies a combination of methods to explore the new design space at the intersection of fashion and technology. First, it contributes to theoretical understandings of aesthetization and fashion institutionalization that influence digital technology design. We show that there is an unstable aesthetization in mobile design and the increased aesthetization is closely related to the fashion industry. Fashion emerged through shared institutional activities, which are usually in the form of action nets in the design of digital devices. “Tech Fashion” is proposed to interpret such dynamic action nets of institutional arrangements that make digital technology fashionable and desirable. Second, through associative design research, we have designed and developed two prototypes that account for institutionalized fashion values, such as the concept “outfit-centric accessory.” We call for a more extensive collaboration between fashion design and interaction design.

  • 2898.
    Zhang, Yanqing
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Juhlin, Oskar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Fashion as System or Action Net in ‘Fashion in All Things’: a Case in Color Design of Mobile Phones2012Ingår i: Fashion: Exploring Critical Issues / [ed] Barbara Brownie, Laura Petican, Johannes Reponen, Oxford: Inter-Disciplinary Press, 2012, nr 1, 263-270 s.Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    Contemporary fashion has permeated into all things in life beyond clothes. Recently, fashion theories take on interests in organization and system. Kawamura proposes a fashion system through which clothing is transformed into the idea of fashion. Can this fashion system be used to analyze other things in fashion? We present a study using mobile phone, one of the most intimate gadgets to people, as a way to approach ‘fashion in all things’. We chose the color as a way to study the fashion aspect in mobile design. Through the empirical study, we find that the decision making of color in mobile industry is a collective process. It is greatly influenced by technology, materials, consumer lifestyle and trend. The trendy colors in mobile design are not defined by certain cultural or social institutions, but formulated by actions conducted by various actors in certain social context. Our study shows that fashion can embrace more than Kawamura’s system, e.g. the action net of color design in mobile technology. Although mobile design shares some similarities with clothing fashion, the concept of fashion-ology is very Parisian and deals with only clothing. It is not fully applicable to mobile industry. If we want to use a fashion system that can apply to fashion in all things, we should revisit the theory to reveal the general characteristics of the fashion world or build smaller theory for each category.

  • 2899.
    Zhang, Yanqing
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Juhlin, Oskar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Fashion in Mobile Phone Design – The Emergence of Beautification, Desirability and Variation through Institutional Collaboration2016Ingår i: Fashion Practice: the journal of design, creative process & the fashion industry, ISSN 1756-9370, E-ISSN 1756-9389, Vol. 8, nr 1, 63-84 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We study if and how fashion values, such as beautification, desirability through symbolic interaction, and high variation, are increasingly visible in mobile phone design. We unpack such possible inter-linkages by interviewing eight representatives of both industries. Their comments allow us to discuss whether a process of fashionalization is underway and, if so, how it is taking place. Our findings indicate that fashion values are visible in the design of mobile phones and are accounted for in design. Fashionalization can thus be seen as emanating from institutions related to clothing that extend to and become shared with the mobile industry, such as a shared dependency on trend agencies for color selection and joint events. This interaction, ad hoc and heterogeneous, resists being modeled as a “system,” which has been suggested as a way to explain institutional work within clothing fashion. Drawing on Barbara Czarniawska’s institutional theory, we propose conceptualizing the emerging institutional work in terms of “action nets.” This concept makes visible flexible, situated, and ad hoc activities rather than stable and fixed organizational entities.

  • 2900.
    Zhang, Yanqing
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Juhlin, Oskar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    The “life and death” of great Finnish fashion phone: A periodization of changing styles in Nokia phone design between 1992 and 20132016Ingår i: Mobile Media & Communication, ISSN 2050-1579, Vol. 4, nr 3, 385-404 s.Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Visual aesthetics is an essential part of our experience of mobile devices, but the ways in which it is accounted for in design have largely been overlooked. We investigate whether an aesthetization of mobile design is taking place and, if so, how it is being pursued through institutional practices in organizations. We conduct a visual analysis of all Nokia phone releases between 1992 and 2013 complemented by an interview series with key actors. The study reveals a continuous increase in aesthetic variation between 1998 and 2008, which is visible in the variation of colors, forms and materials. The period between 2003 and 2008, which we term the Grand period, marks the peak of aesthetization of Nokia’s devices. It exhibits great variation, and is visibly similar to aesthetics in the fashion industry. With the introduction of the slate form, we see a decrease in visual variation between 2009 and 2013. The interviews reveal how the visual design was driven by organizational strategies, such as customer segmentation in general, and an orientation toward the fashion industry, e.g. in the creation of a fashion segment. The study reveals how aesthetic variation is weaved into a complex innovation system with sometimes conflicting demands deriving from e.g. technology and user interaction.

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