Vertrauensunterstützung für sozio-technische ubiquitäre Systeme

Trust has been shown as a crucial factor for the adoption of new technologies. Surprisingly, trust literature offers very little guidance for systematically integrating the vast amount of behavioral trust results into the development of computing systems. The aim of this article is to develop a method for deriving trust supporting components for ubiquitous computing systems. The method is used to derive four trust supporting components for a ubiquitous restaurant recommendation system. Afterwards, the system is evaluated using a laboratory experiment with 166 undergraduate students. The results show that the users’ trust as well as their intention to use the system could be significantly increased. To the best of our knowledge, this is the first article developing and evaluating a method for systematically integrating the behavioral trust results into the development of a computing system and its value.     

GIFT EXCHANGE AND WORKERS' FAIRNESS CONCERNS: WHEN EQUALITY IS UNFAIR5

We study how different payment modes influence the effectiveness of gift exchange as a contract enforcement device. In particular, we analyze how horizontal fairness concerns affect performance and efficiency in an environment characterized by contractual incompleteness. In our experiment, one principal is matched with two agents. The principal pays equal wages in one treatment and can set individual wages in the other. We find that the use of equal wages elicits substantially lower efforts. This is not caused by monetary incentives per se because under both wage schemes it is profit‐maximizing for agents to exert high efforts. The treatment difference instead seems to be driven by the fact that the norm of equity is violated far more frequently in the equal wage treatment. After having suffered from violations of the equity principle, agents withdraw effort. These findings hold even after controlling for the role of intentions, as we show in a third treatment. Our results suggest that adherence to the norm of equity is a necessary prerequisite for successful establishment of gift‐exchange relations. (JEL: J33, D63, M52, C92, J41)     

谁能在科技实践和发展中承担责任

在科技和经济中的道德评价及伦理问题一般是责任的承担、归属和分配问题。责任本身是一个结构或关系多变的概念,有不同的种类和层次;在责任分配模型中,核心是标准化责任和描述责任分配以及集体责任简化为个人责任的问题,个人责任对于科技的实践和发展是至关重要的,集体责任和共同责任的问题也变得越来越有时代性。当专业伦理准则和责任发生冲突时,必须保持伦理规范的优先地位和决定标准,发展、改进并在实际中执行工程道德规范。     

Unfinished Imagined Communities: States, Social Movements, and Nationalism in Latin America

This article addresses two shortcomings in the literature on nationalism: the need to theorize transformations of nationalism, and the relative absence of comparative works on Latin America. We propose a state-focused theoretical framework, centered on conflicts between states elites and social movements, for explaining transformations of nationalism. Different configurations of four key factors — the mobilization of excluded elites and subordinate actors, state elites’ political control, the ideological capacities of states, and polarization around ethnoracial cleavages — shape how contrasting trajectories of nationalism unfold over time. A comparative analysis of early– and mid–twentieth century Mexico, Argentina, and Peru illustrates the explanatory power of our theoretical framework. José Itzigsohn is Associate Professor of Sociology and Ethnic Studies at Brown University. He is the author of Developing Poverty (Penn State University, 2000). His current research focuses on two main topics. The first is the formation of ethnic, racial, and national identities. The second is grassroots economies and workplace democracy. Matthias vom Hau is Ph.D. candidate in the Department of Sociology at Brown University. He is currently completing his dissertation, a comparative-historical analysis of nationalism in twentieth-century Argentina, Mexico, and Peru. His research interests involve the intersections among culture and identity, state power, and social movements.     

Assessments of Direct Human Exposure—The Approach of EU Risk Assessments Compared to Scenario-Based Risk Assessment

The awareness of potential risks emerging from the use of chemicals in all parts of daily life has increased the need for risk assessments that are able to cover a high number of exposure situations and thereby ensure the safety of workers and consumers. In the European Union (EU), the practice of risk assessments for chemicals is laid down in a Technical Guidance Document; it is designed to consider environmental and human occupational and residential exposure. Almost 70 EU risk assessment reports (RARs) have been finalized for high-production-volume chemicals during the last decade. In the present study, we analyze the assessment of occupational and consumer exposure to trichloroethylene and phthalates presented in six EU RARs. Exposure scenarios in these six RARs were compared to scenarios used in applications of the scenario-based risk assessment approach to the same set of chemicals. We find that scenarios used in the selected EU RARs to represent typical exposure situations in occupational or private use of chemicals and products do not necessarily represent worst-case conditions. This can be due to the use of outdated information on technical equipment and conditions in workplaces or omission of pathways that can cause consumer exposure. Considering the need for exposure and risk assessments under the new chemicals legislation of the EU, we suggest that a transparent process of collecting data on exposure situations and of generating representative exposure scenarios is implemented to improve the accuracy of risk assessments. Also, the data sets used to assess human exposure should be harmonized, summarized in a transparent fashion, and made accessible for all risk assessors and the public.     

Trust between individuals and groups: Groups are less trusting than individuals but just as trustworthy

We compare the behavior of groups and individuals in a two-person trust game. The first mover in this game, the sender, receives an endowment and can send any part of it to the responder; the amount sent is tripled, and the responder can then return to the sender any portion of the tripled sum. In a 2 × 2 design, the players in the roles of sender and responder are either individuals or groups of three players (who conduct face-to-face discussions to decide on a collective group strategy). We find that groups in the role of sender send smaller amounts than individuals, and expect lower returns. In particular, groups send nothing more often than individuals do (and are even more likely to do so when the responder is another group). Groups and individuals in the role of responder return on average the same fraction of the amount sent. Hence, we conclude that groups are less trusting than individuals, but just as trustworthy.     

Auswirkungen Der Familiengründung Auf Den Berufsverlauf Von Männern

In this article we use longitudinal data from the German socio-economic Panel to examine the relationship between parenthood and labour market outcomes for men. Both traditional sociological and economical perspectives predict a positive effect of fatherhood on wages, whereas the spreading idea of a modern fatherhood suggests that, at least, fathers of the younger generation tend to reduce their working hours and thus accept wage reductions. Our focus is on the effect of fatherhood on wage growth, hours worked and interfirm mobility. We find that fathers receive higher wages than married men without children, even when controlling for selection into fatherhood. The positive income effect of fatherhood results from greater on-the-job wage growth. However, fathers are not likely to increase their wage by working longer hours or leaving their current employer for a better paid position.