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  • 2701.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Li, Yuhong
    Kanter, Theo
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Edge-based interoperable service-driven information distribution for intelligent pervasive services2017In: Pervasive and Mobile Computing, ISSN 1574-1192, E-ISSN 1873-1589, Vol. 40, p. 359-381Article in journal (Refereed)
    Abstract [en]

    Internet of Things (IoT)-based Intelligent Pervasive Service (IPS) systems face increasing pressure from the massive amounts of heterogeneous data generated; the heterogeneity hinders interoperability between data resources and IPSs, making data sharing inefficient and making it difficult to satisfy the needs and fulfill requirements of the IPSs. In response, this article proposes a method of interoperable service-driven information distribution on the edge side to enhance the service-level interoperability with feature-level interoperability by self-adapting data sharing according to the service needs, which will also help to release incremental data pressure and provide better data privacy by conducting service-driven and relevance-based data sharing.

  • 2702.
    Xiao, Bin
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Zeeshan Asghar, Muhammad
    university of Oulu, faculty of science , department of information processing science .
    Jämsä, Tapani
    university of Oulu , faculty of science , department of information processing science.
    Pulli, Petri
    university of Oulu, faculty of science , department of information processing science.
    “Canderoid”: A mobile system to remotely monitor travelling status of the elderly with dementia2013In: International Joint Conference on Awareness Science and Technology and Ubi-Media Computing (iCAST-UMEDIA), 2013, IEEE Press , 2013, p. 648-654Conference paper (Refereed)
    Abstract [en]

    The number of elderly people increases quickly in many countries, under the global population aging situation. It is an upsetting fact that many elderly people are suffering from the dementia, which seriously obstructs their independent living and travel. It is a pervasive problem that the demented elderly individuals are easy to get lost or go into danger during alone travel in daily life. Therefore we propose a novel mobile system named “Canderoid” to monitor independent outdoor travel of the elderly individuals remotely, with aid from the caretaker. The system is composed mainly of an android terminal (Wanderoid), an MQTT broker, and a platform on caretaker side. In the system, an android terminal named “Wanderoid” is implemented on a smartphone to capture the travelling status, using built-in smartphone sensors (i.e. camera with an adhesive fish-eye lens, compass and GPS). The terminal device is a normal smartphone, with a fish-eye lens attached on the camera. The sensor data are transferred to the platform of caretaker after capturing. The data transmission work relies on a message pushing architecture, which deals with mobile IP address changing and enables remote manipulation of the smartphone terminal, by introducing the MQTT broker. Then the caretaker platform can interpret sensor data and real-timely present the travelling status using snapshot taken by the fish-eye camera, street view and map. A reliability test, energy dissipation test and usability test are carried out on the prototype to verify that the system is effective, easy-to-use, reliable and energy-saving, from the viewpoints of both technology and human factors.

  • 2703. Xiao, Jun
    et al.
    Xu, Zhen
    Yu, Ye
    Cai, Shuo
    Hansen, Preben
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    The Design of Augmented Reality-Based Learning System Applied in U-Learning Environment2016In: E-Learning and Games: 10th International Conference, Edutainment 2016, Hangzhou, China, April 14-16, 2016, Revised Selected Papers / [ed] Abdennour El Rhalibi, Feng Tian, Zhigeng Pan, Baoquan Liu, Springer, 2016, p. 27-36Conference paper (Refereed)
    Abstract [en]

    The easy and widely accessibility of Internet resources makes it possible to support learning almost anywhere at any time through powerful mobile technologies, and facilitate ubiquitous learning (u-learning) to grow in use and popularity. Augmented Reality (AR) can be recognized as a key technology that can be used in the U-learning environment to increase learning effect and improve learning experience. This paper designs an integrated model of U-learning, based on which we have also developed an augmented reality technology based learning system named as “Starry Sky Exploration—Eight Planets of Solar System”; an analysis on its implementation is reported and the AR learning system applicable for U-learning environment is found effective and practical.

  • 2704. Xue, Haoyue
    et al.
    Li, Yuhong
    Rahmani, Rahim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kanter, Theo G.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Xue, Haoyue
    A Mechanism for Mitigating DoS attack in Information-Centric Networks2017In: Proceedings of the 1st International Conference on Internet of Things and Machine Learning, Association for Computing Machinery (ACM), 2017, article id 26Conference paper (Refereed)
    Abstract [en]

    Information-Centric Networking (ICN) 1 is a significant networking paradigm for the Internet of Things, which is an information-centric network in essence. The ICN paradigm owns inherently some security features, but also brings several new vulnerabilities. The most significant one among them is Interest flooding, which is a new type of Denial of Service (DoS) attack, and has even more serious effects to the whole network in the ICN paradigm than in the traditional IP paradigm. In this paper, we suggest a new mechanism to mitigate Interest flooding attack. The detection of Interest flooding and the corresponding mitigation measures are implemented on the edge routers, which are directly connected with the attackers. By using statistics of Interest satisfaction rate on the incoming interface of some edge routers, malicious name-prefixes or interfaces can be discovered, and then dropped or slowed down accordingly. With the help of the network information, the detected malicious name-prefixes and interfaces can also be distributed to the whole network quickly, and the attack can be mitigated quickly. The simulation results show that the suggested mechanism can reduce the influence of the Interest flooding quickly, and the network performance can recover automatically to the normal state without hurting the legitimate users.

  • 2705. Xylia, Maria
    et al.
    Ibrahim, Osama
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Silveira, Semida
    Fossil-free Public Transport: Prescriptive Policy Analysis for the Swedish Bus Fleets2016In: 2016 13th International Conference on the European Energy Market (EEM), IEEE Computer Society, 2016Conference paper (Refereed)
    Abstract [en]

    Elicitation and processing of the relevant information is the core of any policy decision-making process. This study presents a prescriptive policy analysis for the “fossil-free fuel deployment for public transport buses at the national level in Sweden”, using a policy-oriented modelling and simulation tool, Sense4us , that supports systems analysis for policy involving:: (i) Structuring of policy problems using the labelled causal mapping method [11], (ii) Ex ante Impact assessment using scenario-based dynamic simulation modelling and (iii) Ex-ante evaluation of the considered policy options based on the simulation results and using a set of standard criteria for evaluation of EU policy interventions. The results are most of all useful for designing a policy pathway for public bus transport that is both environmentally sustainable and economically feasible. Moreover, the process allows involvement of the key stakeholders to reflect various priorities and preferences.

  • 2706. Yang, Sheng-Chun
    et al.
    Lu, Zhong-Yuan
    Qian, Hu-Jun
    Wang, Yong-Lei
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Han, Jie-Ping
    A hybrid parallel architecture for electrostatic interactions in the simulation of dissipative particle dynamics2017In: Computer Physics Communications, ISSN 0010-4655, E-ISSN 1879-2944, Vol. 220, p. 376-389Article in journal (Refereed)
    Abstract [en]

    In this work, we upgraded the electrostatic interaction method of CU-ENUF (Yang, et al., 2016) which first applied CUNFFT (nonequispaced Fourier transforms based on CUDA) to the reciprocal-space electrostatic computation and made the computation of electrostatic interaction done thoroughly in GPU. The upgraded edition of CU-ENUF runs concurrently in a hybrid parallel way that enables the computation parallelizing on multiple computer nodes firstly, then further on the installed GPU in each computer. By this parallel strategy, the size of simulation system will be never restricted to the throughput of a single CPU or GPU. The most critical technical problem is how to parallelize a CUNFFT in the parallel strategy, which is conquered effectively by deep-seated research of basic principles and some algorithm skills. Furthermore, the upgraded method is capable of computing electrostatic interactions for both the atomistic molecular dynamics (MD) and the dissipative particle dynamics (DPD). Finally, the benchmarks conducted for validation and performance indicate that the upgraded method is able to not only present a good precision when setting suitable parameters, but also give an efficient way to compute electrostatic interactions for huge simulation systems. Program summary Program title: HP-ENUF Program Files doi: http://dx.doLorg/10.17632/zncf24thpv.1 Licensing provisions: GNU General Public License 3 (GPL) Programming language: C, C++, and CUDA C Supplementary material: The program is designed for effective electrostatic interactions of large-scale simulation systems, which runs on particular computers equipped with NVIDIA CPUs. It has been tested on (a) single computer node with Intel(R) Core(TM) i7-3770@ 3.40 GHz (CPU) and GTX 980 Ti (GPU), and (b) MPI parallel computer nodes with the same configurations. Nature of problem: For molecular dynamics simulation, the electrostatic interaction is the most time-consuming computation because of its long-range feature and slow convergence in simulation space, which approximately take up most of the total simulation time. Although the parallel method CU-ENUF (Yang et al., 2016) based on GPU has achieved a qualitative leap compared with previous methods in electrostatic interactions computation, the computation capability is limited to the throughput capacity of a single GPU for super scale simulation system. Therefore, we should look for an effective method to handle the calculation of electrostatic interactions efficiently for a simulation system with super-scale size. Solution method: We constructed a hybrid parallel architecture, in which CPU and GPU are combined to accelerate the electrostatic computation effectively. Firstly, the simulation system is divided into many subtasks via domain-decomposition method. Then MPI (Message Passing Interface) is used to implement the CPU parallel computation with each computer node corresponding to a particular subtask, and furthermore each subtask in one computer node will be executed in GPU in parallel efficiently. In this hybrid parallel method, the most critical technical problem is how to parallelize a CUNFFT (nonequispaced fast Fourier transform based on CUDA) in the parallel strategy, which is conquered effectively by deep-seated research of basic principles and some algorithm skills. Restrictions: The HP-ENUF is mainly oriented to super-scale system simulations, in which the performance superiority is shown adequately. However, for a small simulation system containing less than 106 particles, the mode of multiple computer nodes has no apparent efficiency advantage or even lower efficiency due to the serious network delay among computer nodes, than the mode of single computer node. References: (1) S.-C. Yang, H.J. Qian, Z.-Y. Lu, Appl. Comput. Harmon. Anal. 2016, http://dx.doLorg/10.1016/j.acha. 2016.04.009. (2) S.-C. Yang, Y.-L. Wang, G.-S. Jiao, H.J. Qian, Z.-Y. Lu, J. Comput. Chem. 37 (2016) 378. (3) S.-C. Yang, Y.-L. Zhu, H.-J. Qian, Z.-Y. Lu, Appl. Chem. Res. Chin. Univ., 2017, http://dx.doi.org/10.1007/ s40242-016-6354-5. (4) Y.-L. Zhu, H. Liu, Z.-W. Li, H.J. Qian, G. Milano, Z.-Y. Lu, J. Comput. Chem. 34 (2013) 2197.

  • 2707. Yazdi, Samira
    et al.
    Stein, Matthias
    Elinder, Fredrik
    Andersson, Magnus
    Lindahl, Erik
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics. Stockholm University, Science for Life Laboratory (SciLifeLab). KTH Royal Institute of Technology, Sweden.
    The Molecular Basis of Polyunsaturated Fatty Acid Interactions with the Shaker Voltage-Gated Potassium Channel2016In: PloS Computational Biology, ISSN 1553-734X, E-ISSN 1553-7358, Vol. 12, no 1, article id e1004704Article in journal (Refereed)
    Abstract [en]

    Voltage-gated potassium (K-V) channels are membrane proteins that respond to changes in membrane potential by enabling K+ ion flux across the membrane. Polyunsaturated fatty acids (PUFAs) induce channel opening by modulating the voltage-sensitivity, which can provide effective treatment against refractory epilepsy by means of a ketogenic diet. While PUFAs have been reported to influence the gating mechanism by electrostatic interactions to the voltage-sensor domain (VSD), the exact PUFA-protein interactions are still elusive. In this study, we report on the interactions between the Shaker K-V channel in open and closed states and a PUFA-enriched lipid bilayer using microsecond molecular dynamics simulations. We determined a putative PUFA binding site in the open state of the channel located at the protein-lipid interface in the vicinity of the extracellular halves of the S3 and S4 helices of the VSD. In particular, the lipophilic PUFA tail covered a wide range of non-specific hydrophobic interactions in the hydrophobic central core of the protein-lipid interface, while the carboxylic head group displayed more specific interactions to polar/charged residues at the extracellular regions of the S3 and S4 helices, encompassing the S3-S4 linker. Moreover, by studying the interactions between saturated fatty acids (SFA) and the Shaker K-V channel, our study confirmed an increased conformational flexibility in the polyunsaturated carbon tails compared to saturated carbon chains, which may explain the specificity of PUFA action on channel proteins.

  • 2708. Yilmaz, Natalie
    et al.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Factors Influencing Productization of Enterprise Modeling: A Qualitative Inquiry into the Scandinavian Strand of Methods and Tools2015In: The Practice of Enterprise Modeling, 8th IFIP WG 8.1. Working Conference, PoEM 2015, Valencia, Spain, November 10–12, 2015, Springer , 2015Conference paper (Refereed)
    Abstract [en]

    Enterprise Modeling (EM) methods and tools have been developed and successfully used for more than two decades yet their adoption in organizations is mostly ad hoc. Only a few EM methods and tools have become successful products despite being theoretically sound and having certain success in application in practice. This grounded theory inquiry ponders on what factors influence the successful productization of EM methods and tools. Among the factors discussed are EM maturity gap, method and tool development process, application context, marketing and sales aspects, as well as product aspects.

  • 2709.
    Yngström, Louise
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Abbas, Haider
    Hemani, Ahmed
    Magnusson, Christer
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    A Structured approach for Internalizing Externalities Caused by IT Security Mechanisms2010In: 2nd Int. Workshop on Education Technology and Computer Science, 2010Conference paper (Refereed)
  • 2710.
    Yngström, Louise
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kowalski, Stewart
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Barabanov, Rostyslav
    Stockholm University, Social Sciences, DSV.
    Information Security Metrics: Research Directions2011Other (Other (popular science, discussion, etc.))
    Abstract [en]

    This paper is largely based on a state of the art report covering the information security (IS) metrics area produced as part of the Controlled Information Security (COINS) research project funded by the Swedish Civil Contingencies Agency (MSB) and the comprehensive literature review conducted while compiling the report. The report's findings are summarized and some of the key issues discovered in the course of the literature review are reflected upon. Additionally, the paper describes a conceptual systemic scheme/model for the research process, while explaining its relevance to the subject area, that may help with resolution of the outlined issues in future research in the area. The paper is written principally with a management/governance (rather than engineering) perspective in mind.

  • 2711. You, Fang
    et al.
    Wang, Yujia
    Wang, Jianmin
    Zhu, Xichan
    Hansen, Preben
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Take-Over Requests Analysis in Conditional Automated Driving and Driver Visual Research Under Encountering Road Hazard of Highway2017In: Advances in Human Factors and Systems Interaction: Proceedings of the AHFE 2017 International Conference on Human Factors and Systems Interaction / [ed] Isabel L. Nunes, Springer, 2017, p. 230-240Conference paper (Refereed)
    Abstract [en]

    In conditional automated driving, vehicles monitor the driving environment. Simultaneously, driver can also attend to a secondary task, but also need regain driving control when vehicle requests to intervene. The collaboration of vehicle and human driver support the driving experience in this situation. From automated driving to manual driving while in highway scenario, many researchers focus on secondary task engagement, take-over time and requests. This paper evaluates human performance while regaining driving control in conditional automated driving, research investigates take-over requests under highway hazard scenario through visual scanning analysis in lane changing situation. Different obstacles cause driver visual attention mode changes and adaptations. Results show that all participants can take-over in 6 s for voice chat tasks, while in electronic reading condition, not all participants complete can take-over even in 8 s.

  • 2712.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Eduardo Mondlane University, Moçambique.
    Andersson, Mikael
    Stockholm University, Faculty of Science, Department of Mathematics.
    Mapping malaria incidence distribution that accounts for environmental factors in Maputo Province - Mozambique2010In: Malaria Journal, ISSN 1475-2875, E-ISSN 1475-2875, Vol. 9, article id 79Article in journal (Refereed)
    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.

  • 2713.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Eduardo Mondlane University, Mozambique.
    Andersson, Mikael
    Stockholm University, Faculty of Science, Department of Mathematics.
    Spatial and temporal patterns of malaria incidence in Mozambique2011In: Malaria Journal, ISSN 1475-2875, E-ISSN 1475-2875, Vol. 10, article id 189Article in journal (Refereed)
    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.

  • 2714.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Eduardo Mondlane University, Mozambique.
    Boström, Henrik
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Comparing Support Vector Regression and Random Forests for Predicting Malaria Incidence in Mozambique2013In: 2013 International Conference on Advances in ICT for Emerging Regions (ICTer), IEEE Computer Society, 2013, p. 217-221Conference paper (Refereed)
    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.

  • 2715.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Eduardo Mondlane University, Mozambique .
    Boström, Henrik
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Generalization of Malaria Incidence Prediction Models by Correcting Sample Selection Bias2013In: Advanced Data Mining and Applications: Proceedings, Part II / [ed] Hiroshi Motoda et al., Springer Berlin/Heidelberg, 2013, p. 189-200Conference paper (Refereed)
    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.

  • 2716.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Boström, Henrik
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Predicting the Incidence of Malaria Cases in Mozambique Using Regression Trees and Forests2013In: International Journal of Computer Science and Electronics Engineering (IJCSEE), ISSN 2320-401X, Vol. 1, no 1, p. 50-54Article in journal (Refereed)
    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.

  • 2717.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Boström, Henrik
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Strengthening the Health Information System in Mozambique through Malaria Incidence Prediction2013In: IST-Africa 2013 Conference Proceedings / [ed] Paul Cunningham, Miriam Cunningham, IEEE Computer Society, 2013, p. 1-7Conference paper (Refereed)
    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).

  • 2718.
    Zacarias, Orlando P.
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences. Eduardo Mondlane University, Mozambique .
    Majlender, Peter
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Comparison of infant malaria incidence in districts of Maputo province, Mozambique2011In: Malaria Journal, ISSN 1475-2875, E-ISSN 1475-2875, Vol. 10, article id 93Article in journal (Refereed)
    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.

  • 2719. Zangouei, Farnaz
    et al.
    Babazadeh Gashti, Mohammad Ali
    Höök, Kristina
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Tijs, Tim
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    de Vries, Gert-Jan
    Westerink, Joyce
    How to Stay in the Emotional Rollercoaster: Lessons Learnt from Designing EmRoll2010In: NordiCHI, ACM Press , 2010Conference paper (Other academic)
    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.
  • 2720. Zary, Nabil
    et al.
    Johnsson, Gunillla
    Fors, Uno G. H.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Impact of the virtual patient introduction on the clinical reasoning process in dental education2012In: Bio-Algorithms and Med-Systems, ISSN 1895-9091, Vol. 8Article in journal (Refereed)
    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.

  • 2721.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ilayperuma, Tharaka
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    A Model-driven Approach for Designing E-Services Using Business Ontological Frameworks2010In: Fourteenth IEEE International EDOC Conference (EDOC 2010), IEEE Computer Society , 2010, no 2010Conference paper (Other academic)
    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.
  • 2722.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ilayperuma, Tharaka
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Exploring REA and Open-edi Business Frameworks for Service Modeling2010Conference paper (Other academic)
    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.
  • 2723.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Giannoulis, Constantinos
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Svee, Eric-Oluf
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Using i* to Capture Consumer Preferences as Requirements for Software Product Lines2013In: iStar 20136th International i* Workshop: Proceedings of the 6th International i* Workshop 2013 / [ed] Jaelson Castro, Jennifer Horkoff, Neil Maiden, Eric Yu, 2013, p. 97-102Conference paper (Refereed)
    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.

  • 2724.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Henkel, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Johannesson, Paul
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Moving from Business to Technology using Service-based Processes2005In: IEEE Internet Computing, ISSN 1089-7801, E-ISSN 1941-0131, Vol. 9, no 3, p. 73-81Article in journal (Refereed)
    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.

  • 2725.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ilayperuma, Tharaka
    Designing consumer-aligned services using business value modelling2012In: International Journal of Organisational Design and Engineering (IJODE), ISSN 1758-9797, E-ISSN 1758-9800, Vol. 2, no 3, p. 317-342Article in journal (Refereed)
    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.

  • 2726.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ilayperuma, Tharaka
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Exploring value business models for e-service design2010In: Model-driven domain analysis and software development: architectures and functions / [ed] Janis Osis and Erika Asnina, Hershey: IGI Global, 2010, no 2009, p. 232-253Chapter in book (Other academic)
    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.

  • 2727.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kabilan, Vandana
    Contract-based Exception Handling Process Patterns2008In: Proceedings of the 7th International Conference on Information Systems and its Applications (ISTA 2008), Springer , 2008, Vol. 5Conference paper (Refereed)
  • 2728.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kampars, Janis
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Using Open Data to Support Organizational Capabilities in Dynamic Business Contexts2018In: Advanced Information Systems Engineering Workshops: CAiSE 2018: Proceedings / [ed] Raimundas Matulevičius, Remco Dijkman, Springer, 2018, p. 28-39Conference paper (Refereed)
    Abstract [en]

    In essence, Open Data (OD) is the information available in a machine-readable format and without restrictions on the permissions for using or distributing it. Open Data may include textual artifacts, or non-textual, such as images, maps, scientific formulas, and other. The data can be publicized and maintained by different entities, both public and private. The data are often federated, meaning that various data sources are aggregated in data sets at a single “online” location. Despite its power to distribute free knowledge, OD initiatives face some important challenges related to its growth. In this paper, we consider one of them, namely, the business and technical concerns of OD clients that would make them able to utilize Open Data in their enterprise information systems and thus benefit in terms of improvements of their service and products in continuous and sustainable ways. Formally, we describe these concerns by means of high-level requirements and guidelines for development and run-time monitoring of IT-supported business capabilities, which should be able to consume Open Data, as well as able to adjust when the data updates based on a situational change. We illustrated our theoretical proposal by applying it on the service concerning regional roads maintenance in Latvia.

  • 2729.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, MariteJohannesson, PaulStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Advanced Information Systems Engineering: 27th International Conference, CAiSE 2015, Stockholm, Sweden, June 8-12, 2015, Proceedings2015Conference proceedings (editor) (Refereed)
    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.

  • 2730.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, Marite
    Johannesson, Paul
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Preface to CAISE 20152016In: Information Systems, ISSN 0306-4379, E-ISSN 1873-6076, Vol. 62Article in journal (Other academic)
  • 2731.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Pastor, Oscar
    Loucopoulos, Peri
    Selected Topics on Advances in Capability-Oriented Information Systems Development: Editorial Introduction to Issue 10 of CSIMQ2017In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, no 10, p. 1-2Article in journal (Other academic)
    Abstract [en]

    Modern organizations need to be sustainable in the presence of dynamically changing business conditions, which require from Information Systems (IS) to address complex challenges for being able to support organizations acting in varying business conditions – changing customer demands, new legislations, new customers, and emerging alliances. From a technical perspective, the gap between business requirements and supporting IS is still present, mostly due to the fact that current IS development approaches operate with artifacts defined on a relatively low abstraction level. To go beyond the state of the art, IS development frameworks used by enterprises need to be structured for solving emerging problems, and enterprises need to have efficient methods for the use of these frameworks to deliver the right IS solutions just-in-time and just-enough. The notion of capability emerged in the beginning of the nineties in the context of competence-based management, military frameworks, and developing organization’s competitive advantage – linguistically, it means the ability or qualities necessary to do something.

  • 2732.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Pastor, Oscar
    Loucopoulos, Peri
    Selected Topics on Business Informatics: Editorial Introduction to Issue 13 of CSIMQ2017In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, no 13, p. 1-2Article in journal (Other academic)
    Abstract [en]

    Business Informatics is the scientific discipline targeting information processes and related phenomena in their socio-economical business context, including companies, organisations, administrations and society in general. As a field of study, it endeavours to take a systematic and analytic approach in adopting a multi-disciplinary orientation that draws theories and practices from the fields of management science, organisational science, computer science, systems engineering, information systems, information management, social science, and economics information science.

    The objective of this thematic issue is to bring attention to actual research on Business Informatics, as being publicized on the 19th IEEE Conference on Business Informatics (CBI 2017), July 24-27, 2017, in Thessaloniki, Greece. The conference created a productive forum for researchers and practitioners from the fields that contribute to the construction, use and maintenance of information systems and the organisational context in which they are embedded. This issue of CSIMQ comprises extended version of four CBI papers and one external article.

  • 2733.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Pastor, Oscar
    Loucopoulos, Pericles
    On the Capability Notion in Business Informatics: [Opening]2014In: [Proceedings of] The 1st International Workshop on Capability-oriented Business Informatics (CoBI 2014) / [ed] Jelena Zdravkovic, Peri Loucopoulos, Oscar Pastor, 2014, p. 1-2Conference paper (Other academic)
    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.

  • 2734.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rychkova, Irina
    A Capability-Oriented Approach to IT Governance: The Case of Public Service Organizations2017In: Advanced Information Systems Engineering Workshops: Proceedings / [ed] Andreas Metzger, Anne Persson, Springer, 2017, p. 39-49Conference paper (Refereed)
    Abstract [en]

    Getting more value from IT is becoming a critical objective for today’s organizations. IT Governance is an important strategic instrument that should ensure organizations to succeed with this objective and therefore it needs to be efficiently planned, structured and executed. To respond to increasing service demands while preserving or even increasing the value provided by services, public organizations require resources and abilities that lay outside their boundaries - such as co-production, open innovation, as well as engagement of citizens and partner organizations. To respond to these challenges, public organizations need to employ new governance solutions to their IT to overcome the shortcomings of hierarchical structures and traditional centralized decision-making. In this study, we discuss a capability-oriented governance approach, which aligns envisioned public values with actors, processes and resources and accordingly compound different IT Governance capabilities. We illustrate our proposal on the student mobility case in the Higher Education public service.

  • 2735.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Rychkova, Irina
    Speckert, Thomas
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Requirements for IT Governance in Organizations Experiencing Decentralization2015In: 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, p. 269-285Conference paper (Refereed)
    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.

  • 2736.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Grabis, Janis
    A Comparative Analysis of Using the Capability Notion for Congruent Business and Information Systems Engineering2017In: Complex Systems Informatics and Modeling Quarterly, ISSN 2255-9922, no 10, p. 1-20Article in journal (Refereed)
    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.

  • 2737.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Henkel, Martin
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Grabis, Janis
    Modelling Business Capabilities and Context Dependent Delivery by Cloud Service2013In: Advanced Information Systems Engineering: Proceedings / [ed] Camille Salinesi, Moira C. Norrie, Óscar Pastor, Springer Berlin/Heidelberg, 2013, p. 369-383Conference paper (Refereed)
    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.

  • 2738.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, Marite
    Karagiannis, Dimitri
    Winter, Robert
    Advanced Enterprise Modeling: Editorial2015In: Business & Information Systems Engineering, ISSN 1867-0202, Vol. 57, no 1, p. 1-2Article in journal (Other academic)
  • 2739.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, JanisStockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.Kirikova, MariteKaragiannis, DimitrisWinter, Robert
    Advanced Enterprise Modeling2015Collection (editor) (Refereed)
  • 2740.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kirikova, Marite
    Karagiannis, Dimitris
    Winter, Robert
    BISE – Call for Papers Issue 1/20152013In: Business & Information Systems Engineering, ISSN 1867-0202, Vol. 5, no 5, p. 361-361Article in journal (Refereed)
  • 2741.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Stirna, Janis
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Kuhr, Jan-Christian
    Koç, Hasan
    Requirements Engineering for Capability Driven Development2014In: 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, p. 193-207Conference paper (Refereed)
    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.

  • 2742.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Svee, Eric-Oluf
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Giannoulis, Constantinos
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Capturing consumer preferences as requirements for software product lines2015In: Requirements Engineering, ISSN 0947-3602, E-ISSN 1432-010X, Vol. 20, no 1, p. 71-90Article in journal (Refereed)
    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.

  • 2743.
    Zdravkovic, Jelena
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Zikra, Iyad
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Ilayperuma, Tharaka
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    An MDA Method for Service Modeling by Formalizing REA and Open-edi Business Frameworks with SBVR2011Conference paper (Refereed)
    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.

  • 2744. Zdravković, Milan
    et al.
    Zdravković, Jelena
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Aubry, Alexis
    Moalla, Néjib
    Guedria, Wided
    Sarraipa, João
    Domain framework for implementation of open IoT ecosystems2018In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 56, no 7, p. 2552-2569Article in journal (Refereed)
    Abstract [en]

    The current Internet-of-things (IoT) hype, pushed by the unprecedented rate of the technological enablers’ innovation, is threatening to leave behind some major, not so obvious, unresolved issues. IoT platforms will extend existing enterprise information systems (EIS) infrastructures to encompass cross-domain sensing and actuating capabilities, thus introducing additional complexity and major risks to the implementation. Furthermore, IoT platforms are typically driven by models of the trivial complexity; they support very simple data structures and almost no business logic implementation. Finally, IoT systems are today managed centrally, which often means less openness, less flexibility and greater change management costs. In this article, we provide the overview of the scientific disciplines which could contribute to the resolution of the IoT implementation problem, namely requirements engineering, change management/continuous improvement, model-based systems engineering, system architecture design, interoperability and policy and regulatory aspects. Then, we identify the challenges of these contributions in the context of IoT and finally make an attempt to identify research directions which could have a significant impact. The discussion of the challenges and opportunities is illustrated by the proposed domain framework for implementation of open IoT ecosystems.

  • 2745.
    Zetali, Karwan
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Nouri, Jalal
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Learners left to their own devices. The challenges of student scaffolding in outdoors mobile learning activities2017In: EDULEARN17: Conference Proceedings, The International Academy of Technology, Education and Development, 2017, p. 3796-3802Conference paper (Refereed)
  • 2746.
    Zeynep, Ahmet
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Holmquist, Lars Erik
    Sharing mobile services - Beyond the app store model2010In: MobileHCI 2010, ACM Press , 2010Conference paper (Other academic)
  • 2747.
    Zeynep, Ahmet
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Jonsson, Martin
    Holmquist, Lars Erik
    Sumon, Saiful Islam
    Supporting embodied exploration of physical concepts in mixed digital and physical interactive settings2011In: TEI 2011, ACM Press , 2011Conference paper (Other academic)
  • 2748.
    Zeynep, Ahmet
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Cramer, Henriette
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Holmquist, Lars Erik
    SICS / Mobile Life, , .
    Rost, Mattias
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Gamification and location-sharing: Some emerging social conflicts2011In: CHI2011, Vancouver, Canada: ACM Press , 2011Conference paper (Other academic)
    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.

  • 2749.
    Zeynep, Ahmet
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
    Väänänen-Vainio Mattila, Kaisa
    Tampere University of Technology, , .
    Face to face makes a difference: Recommendation Practices of Users of Mobile Services2011In: UbiComp2011, Beijing, China: ACM Press , 2011Conference paper (Other academic)
    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.

  • 2750. Zhang, Baofeng
    et al.
    Wu, Desheng Dash
    Stockholm University, Faculty of Social Sciences, Stockholm Business School. University of Chinese Academy of Science, China.
    Liang, Liang
    Optimal Option Ordering and Pricing Decisions With Capital Constraint and Default Risk2017In: IEEE Systems Journal, ISSN 1932-8184, E-ISSN 1937-9234, Vol. 11, no 3, p. 1537-1547Article in journal (Refereed)
    Abstract [en]

    This paper examines a single-period supply chain system consisting of a manufacturer selling an option contract to a capital-constrained retailer who faces stochastic demand. Option contract can transfer partial risk from the retailer to the manufacturer. This paper extends the existing literature of game-theoretic and credit financing models by explicitly incorporating retailer's default risk into the pure option ordering and pricing decision problems. Stackelberg equilibriums under different scenarios, i.e., capital sufficient, capital constraint without credit, bank credit (BC), and trade credit (TC), are derived. The analytic model demonstrates that, under TC, the retailer can behave with and without bankruptcy risk, which depends on the retailer's initial capital. Both the mathematical model and computational experiments reveal that the decisions and profits under BC are independent of retailer's default risk, whereas default risk has a significant impact on the decisions and profits under TC. It shows that TC contract can partially coordinate the supply chain.

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