Dynamic Policies for Optimal LEO Satellite Launches

Low‐earth orbit satellite (LEO) systems continue to provide mobile communication services. The issue of cost containment in system maintenance is a critical factor for continued operation. Satellite finite life‐times follow a stochastic process, and since satellite replenishment cost is the most significant on‐going cost of operation, finding optimal launch policies is of paramount importance. This paper formulates the satellite launch problem as a Markovian decision model that can be solved using dynamic programming. The policy space of the system is enormous and traditional action space dominance rules do not apply. In order to solve the dynamic program for realistic problem sizes, a novel procedure for limiting the state space considered in the dynamic program is developed. The viability of the proposed solution procedure is demonstrated in example problems using realistic system data. The policies derived by the proposed solution procedure are superior to those currently considered by LEO system operators, and result in substantial annual cost savings.     

Interorganizational Trust: Origins,Dysfunctions and Regulation of Rigidities

This conceptual paper extends research on the downsides of developing trust to partners in interorganizational relationships. The idea developed captures that, although interorganizational trust generates benefits, a parallel process also produces undesired rigidities. Firms' flexibility in meeting a changing environment may thus be hampered rather than enabled by the created interorganizational relationship. First, we theorize on the micro‐processes of how and why such rigidities develop already at low levels of trust and accumulate in parallel to the positive trust effects as trust builds stronger over time. Second, we propose that the trust dysfunctions can be distinguished and moderated separately from trust benefits. In doing so, we identify and discuss the moderating potential of a set of handling tactics when trust develops rigidities in the relationship: competing, accommodating, avoiding, collaborating and compromising tactics. We discuss implications in relation to research on trust, inertia and interorganizational governance.     

Managing competence acquisition and financial performance: An empirical study of how small firms use competence acquisition strategies

Past research has neglected how small firms manage competence acquisition. Based on transaction cost literature, this article identifies competence acquisition management strategies and their implications for performance. We explore this issue using survey data from 842 small, knowledge-intensive firms. The results outline four aspects of competence acquisition management: (1) competence absorbers, (2) social acquirers, (3) market acquirers, and (4) nonacquirers. Furthermore, we hypothesized and found that market acquirers score higher in terms of financial performance than firms following the other strategies. The market acquirer strategy proved particularly effective under conditions of high dynamism.     

Learning to listen and look: the shift from the monitorial system of education to teacher-led lessons

ABSTRACT

This article discusses the relationship between the senses, power and educational change. A case study of a significant shift in instruction methods will be used to show how educational change is related to both the senses and to power. The monitorial system of education, as developed by Bell and Lancaster in the early 19th century, was a system that facilitated the instruction of large numbers of pupils by just one teacher. Most of the instruction was conducted by pupils, older and/or more experienced children, whereas the teacher had an overarching responsibility for overlooking the “machinery” without teaching much himself. In the second half of the 19th century the method was replaced by a new method in public elementary schools. From now on teacher-led lessons came to be the norm for what mass education should look like. This momentous change meant, among other things, that the relationship between pupils and teacher was transformed as the teacher increasingly was supposed to hold lessons, whereas the pupil to a greater extent became associated with listening to and closely observing a lesson.     

Public pension institutions and old‐age mortality in a comparative perspective

Norström T, Palme J. Public pension institutions and old‐age mortality in a comparative perspective Int J Soc Welfare 2010: ??: ??–??© 2010 The Author(s), Journal compilation © 2010 Blackwell Publishing Ltd and International Journal of Social Welfare. The aim of the study was to estimate the impact of changes in pension rights on old‐age mortality. We made a distinction between two dimensions of pension benefits, one of providing basic security (BASIC), and the other of providing income security (INCOME). Analyses were based on data for 18 OECD countries during the post‐war period. The outcome comprised old‐age excess mortality, defined as the ratio of the mortality rate 65+ to the mortality rate in the age group 30–59 years. The latter was regarded as a proxy for unobserved factors potentially related to old‐age mortality as well as pension rights. The pooled cross‐sectional time series data were analysed through fixed effects modelling. The results suggest that BASIC (but not INCOME) has a beneficial impact on old‐age excess mortality, which was statistically significant. We interpret the results in terms of the poverty‐reducing effects of pension entitlements with a basic security orientation.     

Decoupling thinking in service operations: a case in healthcare delivery system design

The notion of decoupling thinking has been well established in the manufacturing operations and supply chain management literature. This paper explores how this decoupling thinking can be applied in service operations and in particular in health care. It first reviews the relevant literature on decoupling fundamentals, the front- and back-office distinction, and new emerging decoupling thinking in service operations. Subsequently, a flow-based framework including content and process is developed for decoupling thinking in service operations. The framework provides an integrated perspective on customer contact, flow driver and flow differentiation (level of customisation). The framework hence, through flow differentiation, introduces the concept of standardisation versus customisation in a service context. This is followed by a health care case example to illustrate how the framework can be applied. The managerial implications are primarily in terms of a modularised approach to system design and management. The framework offers potential for benchmarking with other service systems as well as with manufacturing systems based on the shared foundation in decoupling thinking. Finally, suggestions are provided for further research opportunities derived from this research.     

Production planning and control tools

There are numerous tools available to be used for production planning and control purposes. The number of tools is ever increasing, and so are the levels of sophistication as well as complexity. For the specific manufacturing firm, the task of selecting the most appropriate set of tools is not trivial. However, in recent years, the understanding of the relationship between tools and manufacturing environments for which they are suitable has increased. The purpose of this paper is to provide an overview of production planning and control tools available today, as well as new trends, issues and ideas.     

Fiscal stringency and fiscal sustainability: Panel evidence from the American state and local governments

Most state (and local) governments in the U.S. operate under formal fiscal rules which limit their ability to run budget deficits and resort to debt financing. A priori, one would expect to find evidence in favor of an intertemporally balanced budget, or fiscal sustainability, for these states, especially those characterized by a relatively high degree of fiscal stringency. We test this hypothesis for a panel of 47 state–local government units (1961–2006) using four budget balance definitions and several subsamples defined based on regional classifications, or presence of certain balanced budget requirements (BBRs). Our results, obtained from panel estimation techniques that allow for general forms of serial and cross-sectional dependence, suggest that a sufficient condition for “strong” sustainability is consistently satisfied for the full sample and all subsamples in relation to balances that include special funds and/or federal grants. However, we find evidence consistent with the “weak” version of sustainability for the full sample and some regional subsamples (particularly Far West dominated by California) in at least one of the two balances that exclude these items. Finally, the BBRs seem to matter only in relation to the sustainability of the more narrowly defined balances. We discuss the implications of these findings for the role of fiscal rules and federal grant policies.     

The Fiscal Cost of Refugee Immigration: The Example of Sweden

The world currently has more refugees and internally displaced persons than it has had since World War II. Yet the readiness of many wealthy countries to provide asylum to these refugees is waning, and a major reason for this is the fiscal burden that would result from larger refugee intakes. To evaluate the size of this fiscal burden, this study estimates the net fiscal redistribution to the total refugee population in Sweden, the country with the largest per capita refugee immigration rate in the Western world since the early 1980s. The total redistribution in 2007 corresponds to 1.0 percent of Swedish GDP in that year. Four‐fifths of the redistribution is due to lower public per capita revenues from refugees compared with the total population, and one‐fifth to higher per capita public costs.