Jönköping University Foundation is a Swedish university located in the city Jönköping in the southern part of Sweden. The university is characterized by internationalization, an entrepreneurial spirit and collaboration with surrounding society. Jönköping University is a member of the European University Association, EUA. Wikipedia.
Stromberg N.,Jonkoping University College
Structural and Multidisciplinary Optimization | Year: 2010
In this paper the concept of extended optimality, or hyperoptimality, is adopted. By following this idea, a new compliance-volume product is suggested as objective. The volume appearing in the product is also raised to the power of a new design parameter which can be set to different values. In such manner design concepts with different volume fractions can be generated by using the approach of extended optimality. Both manufacturing constraints and unilateral contact constraints are included in the proposed method. The manufacturing constraints are implemented by adjusting the move limits such that the draw directions are satisfied. Both one draw direction as well as split draw constraints are considered. The contact conditions are modeled by the augmented Lagrangian approach such that the Jacobian in the Newton algorithm as well as in the adjoint equation becomes symmetric. The design parametrization is done by the SIMP model and Sigmund's filter is utilized when the sensitivities are calculated. The proposed method is very robust and efficient. This is demonstrated by solving problems in both 2D and 3D. The numerical results are also compared to solutions obtained by performing compliance optimization with a constraint on the volume fraction.
Thorn C.,Jonkoping University College
Information and Software Technology | Year: 2010
Context: More and more, small and medium-sized enterprises (SMEs) are using software to augment the functionality of their products and offerings. Variability management of software is becoming an interesting topic for SMEs with expanding portfolios and increasingly complex product structures. While the use of software product lines to resolve high variability is well known in larger organizations, there is less known about the practices in SMEs. Objective: This paper presents results from a survey of software developing SMEs. The purpose of the paper is to provide a snapshot of the current awareness and practices of variability modeling in organizations that are developing software with the constraints present in SMEs. Method: A survey with questions regarding the variability practices was distributed to software developing organizations in a region of Sweden that has many SMEs. The response rate was 13% and 25 responses are used in this analysis. Results: We find that, although there are SMEs that develop implicit software product lines and have relatively sophisticated variability structures for their solution space, the structures of the problem space and the product space have room for improvement. Conclusions: The answers in the survey indicate that SMEs are in situations where they can benefit from more structured variability management, but the awareness need to be raised. Even though the problem space similarity is high, there is little reuse and traceability activities performed. The existence of SMEs with qualified variability management and product line practices indicates that small organizations are capable to apply such practices. © 2009 Elsevier B.V. All rights reserved.
Samuelsson U.,Jonkoping University College
Learning, Media and Technology | Year: 2010
Swedish children have grown up in a digital culture, but have internalized information and communication technology (ICT) in different ways and gained most of their knowledge by peer-based learning. The aim of this study is to give an empirical understanding of patterns of ICT use among Swedish children. The data are collected through a survey including all 13-year-old children in a municipality (N = 256). The results show that all children have access to ICT but they use it in various ways. The children's use of ICT differs in both qualitative and quantitative ways, but there is a lack in basic computer skills as well as seriousness about ICT use as a tool for education and learning. These findings should be seen in relation to Sweden's ranking as a mature e-society, and at the same time, the Swedish National Agency for Education asking for more explicit national strategies and guidelines for ICT use in the educational system. © 2010 Taylor & Francis.
Hilletofth P.,Jonkoping University College
Industrial Management and Data Systems | Year: 2012
Purpose - The purpose of this paper is to develop a framework for differentiation focused supply chain design (SCD). Design/methodology/approach - This research uses a literature review and case study approach to develop a framework for differentiation focused SCD. The proposed framework has been developed based on the literature review and evaluated against the case study. The case study describes SCD at two Swedish companies; one from the appliance industry and the other from the furniture industry, both having a significant international presence. Empirical data have been collected, mainly from in-depth and semi-structured interviews with key persons representing senior and middle management in the case companies. Findings - This research suggests that differentiation-focused SCD can be organized into a five-stage process. It is essential that this process is aligned with new product development (NPD), so they exchange information, and operate based on the same segmentation model. The main benefits of a differentiated supply chain are enhanced competitiveness, as supply chain management (SCM) changes from being a cost center to being a value generating function, and increased profitability, by allowing differentiated customer needs to be satisfied cost-efficiently. To succeed with developing a differentiated supply chain, logisticians must be extensively involved with both the NPD process and the strategic marketing process. Research limitations/implications - Current models of SCD are simplistic and not well developed. By combining theory with practical applications, this research provides researchers and decision makers with detailed tools for developing a differentiation-focused SCD process. The research is explorative in nature therefore empirical data from similar and other research settings should be gathered to reinforce the validity of the findings. Practical implications - This research provides knowledge and insights on how a differentiated supply chain may be developed. The main implication is that SCD needs to be closely aligned with NPD and marketing in order to gain competitive advantage. Companies may also be able to employ labor closer to the consumption market by focusing on supply chain differentiation. Originality/value - This research contributes by developing a process for differentiation-focused SCD, and by demonstrating the main benefits and requirements of a differentiated supply chain. © Emerald Group Publishing Limited.
Klarbring A.,Linkoping University |
Stromberg N.,Jonkoping University College
Structural and Multidisciplinary Optimization | Year: 2013
Stiffness topology optimization is usually based on a state problem of linear elasticity, and there seems to be little discussion on what is the limit for such a small rotation-displacement assumption. We show that even for gross rotations that are in all practical aspects small (<3 deg), topology optimization based on a large deformation theory might generate different design concepts compared to what is obtained when small displacement linear elasticity is used. Furthermore, in large rotations, the choice of stiffness objective (potential energy or compliance), can be crucial for the optimal design concept. The paper considers topology optimization of hyperelastic bodies subjected simultaneously to external forces and prescribed non-zero displacements. In that respect it generalizes a recent contribution of ours to large deformations, but we note that the objectives of potential energy and compliance are no longer equivalent in the non-linear case. We use seven different hyperelastic strain energy functions and find that the numerical performance of the Kirchhoff-St.Venant model is in general significantly worse than the performance of the other six models, which are all modifications of this classical law that are equivalent in the limit of infinitesimal strains, but do not contain the well-known collapse in compression. Numerical results are presented for two different problem settings. © 2012 Springer-Verlag.