Incorporating preference information in interactive reference point methods for multiobjective optimization

In this paper, we introduce new ways of utilizing preference information specified by the decision maker in interactive reference point based methods. A reference point consists of desirable values for each objective function. The idea is to take the desires of the decision maker into account more closely when projecting the reference point onto the set of nondominated solutions. In this way we can support the decision maker in finding the most satisfactory solutions faster. In practice, we adjust the weights in the achievement scalarizing function that projects the reference point. We identify different cases depending on the amount of additional information available and demonstrate the cases with examples. Finally, we summarize results of extensive computational tests that give evidence of the efficiency of the ideas proposed.     

The riddle of things: Activity theory and actor‐network theory as approaches to studying innovations

This article compares cultural‐historical activity theory (AT) and actor‐network theory (ANT) as approaches to studying technical innovations. The concept of nature and society production in the ANT and the concept of activity in the AT have much in common as attempts to transcend the dualism between subject and object, nature and society. The symmetrical (ANT) and the dialectical (AT) interpretations of the concept of mediation are compared. It is suggested that the historically developed, artifact‐mediated structure of human activity is instrumental in studying interaction and coevolution of social and material entities. Three limitations of the concept of generalized symmetry, or symmetrical mediation, become evident when the concept is used in empirical studies of innovation: First, it does not supply any criteria for defining the nature and scope of actors in a heterogeneous network. Second, it leads to an asymmetrical, Machiavellian analysis of innovation in which the contribution of designers, users, and nonhuman entities remains marginal. Third, it does not provide any explanation for the intentionality and competence of humans. It is suggested that these problems can be solved if the innovation network is studied as a network of activity systems. Nonhuman entities are included in the analysis as historically developed arrays of tools and raw materials of the activity systems. This approach is elaborated by analyzing an unsuccessful innovation process, the production of ethanol from wood through the use of cellulose‐degrading enzymes. It is suggested that instead of applying the symmetrical semiotic language proposed by ANT in the analysis, a dialogue that utilizes the historically developed resources and languages of different thought communities is needed.     

Achieving styles of Bulgarian managers and politicians: a longitudinal perspective

We explore individual and organizational leadership behaviour in a transitional economy context. Through the instruments of the Achieving Styles/Connective Leadership model (AS/CL), we assess the goal-directed behaviour of Bulgarian managers and politicians who are members of the national Parliament. The study adopts a longitudinal approach since we analyse data collected in 2003 and 2005, and compare it with evidence collected in 1988. The quantitative results reveal that there are no significant differences in the ways Bulgarian politicians have accomplished their objectives in 1988 and in 2003, whereas Bulgarian managers reported a shift in four out of nine achieving styles in 2003 and 2005 compared to 1988. We have found a substantial fit between the individual and the organizational scores, which indicate that Bulgarian managers behave in ways rewarded by their organizations. The results are used to analyse the pace of organizational change within the setting of Bulgarian transitional economy.     

Child development in foster family care – what really counts?

Previous research has demonstrated that children who grow up in foster family care – along with other child welfare recipients – manage less well in adulthood compared to those children who do not. Given this challenge, this integrative literature review locates the critical factors that either positively or negatively affect a child’s development in foster family care. The articles were analysed using theory-driven content classification in relation to Bronfenbrenner’s bioecological framework on child development. The results of the review suggest that there is a wide range of factors that could impact on a child’s development in foster family care. Child­related factors such as the child’s age, gender, behavioural or mental health problems, etc. were mentioned most often in the data. Micro­environmental factors are also essential to a child’s development. Linkages taking place between two or more of the child’s circumstances, such as the relationship between the child’s birth and foster families and between the foster family and the social worker, were also identified as being influential. Service usage and political and legislative factors, as well as attitudes towards children in care, were also indicated to be strongly influential. It is suggested that the factors identified in this review should be carefully considered as important aspects of care for fostered children and care documentation.     

Expanding uses of building information modeling in life-cycle construction projects

BIM is targeted at providing information about the entire building and a complete set of design documents and data stored in an integrated database. In this paper, we study the use of BIM in two life-cycle construction projects in Kuopio, Finland during 2011. The analysis of uses of BIM and their main problems will constitute a foundation for an intervention. We will focus on the following questions: (1) How different partners use the composite BIM model? (2) What are the major contradictions or problems in the BIM use? The preliminary findings reported in this study show that BIM has been adopted quite generally to design use but the old ways of collaboration seem to prevail, especially between designers and between designers and building sites. BIM has provided new means and demands for collaboration but expansive uses of BIM for providing new interactive processes across professional fields have not much come true.     

Context and interpretation in laboratory experiments: The case of reciprocity

The existing literature acknowledges that a mismatch between the experimenter’s and the subjects’ models of an experimental task can adversely affect the interpretation of data from laboratory experiments. We primarily focus on experiments designed to test a hypothesis by comparing behavior across two or more games and highlight the drawbacks of using a between-subjects design or a within subjects design. An alternative design for laboratory experiments is proposed which may alleviate this concern especially in studies of social preferences. We argue that the proposed design does not introduce any conceptual problems in addition to those that are already present in the between and within subjects designs and may alleviate some of the problems inherent to these designs in certain cases. We also use the proposed design to answer some questions that have attracted continued attention in the literature on social preferences in general and reciprocity in particular.