Improved algorithms for ranking and unranking (k, m)-ary trees in B-order

Journal of Combinatorial Optimization - Du and Liu (Eur J Comb 28:1312–1321, 2007) introduced (k, m)-ary trees as a generalization of k-ary trees. In a (k, m)-ary tree,...     

Tight bound for matching

Let M be the number of edges in a maximum matching in graphs with m edges, maximum vertex degree k and shortest simple odd-length cycle length L. We show that

Government spending on research and development and industrial production in Singapore

The role of government policies in the economic growth of Singapore has been well documented. The governments actions, such as the provision of appropriate infrastructure, have resulted in massive inflow of foreign capital to Singapore. Government sponsorship of selected industries and foreign investment helped domestic firms to gain access to advanced technologies. During the 1990s there was a significant increase in government spending on research and development (R&D) that can be attributed to the development of advanced technologies by Singaporean firms. This paper examines the impact of government-funded R&D in fostering the development of Singapores industrial production in the 1990s. The study explicitly considers the performance of three industries within the manufacturing sector: the machinery and equipment industry, the electrical machinery industry, and the transport equipment industry. It is shown that the fluctuations in real government spending on R&D had a significant positive impact on the performance of the selected manufacturing industries.     

Metabolism of Public Research Organizations: How Do Laboratories Consume State Subsidies?

Public Organization Review - The goal of this study is to suggest a new approach, called metabolism of research organizations, which analyzes how labs consume public funding to manage...     

Correction to: Why perceived organizational and supervisory family support is important for organizations? Evidence from the field

Review of Managerial Science - Under Table 1, the explanation regarding the dummy variables that represent gender is reverse coded.     

Independent domination in subcubic graphs

Journal of Combinatorial Optimization - A set S of vertices in a graph G is a dominating set if every vertex not in S is adjacent to a vertex in S. If, in addition, S is an independent...     

The Opportunities and Constraints to Collaboration in Public Sector Management

Public Organization Review - This article synthesizes current insights about the opportunities and constraints to collaborative public management. Despite the swath of research on...     

Steiner tree in k-star caterpillar convex bipartite graphs: a dichotomy

Journal of Combinatorial Optimization - A bipartite graph G(X, Y) whose vertex set is partitioned into X and Y is a convex bipartite graph, if there is an ordering of $$X=(x_1,\ldots...     

Heuristics for cross-docking scheduling of truck arrivals,truck departures and shop-floor operations

Journal of Combinatorial Optimization - This work studies the problem of cross-docking truck scheduling introduced by (Int J Prod Econ 194:102–112, Serrano et al. 2017), where...     

Guess who’s coming to dinner: the case of IC reporting in Italy

Journal of Management and Governance - In the last 2 decades, intellectual capital (IC) reporting has been promoted with the idea that it can lead to internal (managerial) and external...     

Operationalizing public value in higher education: the use of narratives as an alternative for performance indicators

Journal of Management and Governance - More than 25 years after Moore’s first introduction of the public value concept in 1995, the concept is now widely used, but its...     

The effect of board size on shareholder value: Evidence from bank mergers and acquisitions

This study examines the effect of board size on the economic impact of bank mergers and acquisitions (M&A) in the US. Using a hand-collected dataset of 508 M&A between 2012 and 2018, we find that board size is negatively related to acquirer excess returns. In an additional analysis, we show that large boards have positive value implications for banks that combine the CEO and chairman roles as well as for large banks. Our findings indicate that a “one-size-fits-all” approach to board size is not necessarily in the interests of shareholders; instead, a more flexible and proactive formulation is needed.     

On the total {k}-domination number of Cartesian products of graphs

Let γ _t ^{k}(G) denote the total {k}-domination number of graph G, and let denote the Cartesian product of graphs G and H. In this paper, we show that for any graphs G and H without isolated vertices, . As a corollary of this result, we have for all graphs G and H without isolated vertices, which is given by Pak Tung Ho (Util. Math., 2008, to appear) and first appeared as a conjecture proposed by Henning and Rall (Graph. Comb. 21:63–69, 2005). The work was supported by NNSF of China (No. 10701068 and No. 10671191).     

On total and edge coloring some Kneser graphs

Journal of Combinatorial Optimization - In this work, we investigate the total and edge colorings of the Kneser graphs K(n, s). We prove that the sparse case of Kneser graphs, the odd...     

Retail consolidation in synchronized supply chains

Summary  In this paper, we describe a basic model to analyze a mixed consolidation strategy with direct and indirect shipments through stockless consolidation centers. This model can help to approximate the potential savings in a retail distribution network. Based on our transport consolidation model, we show that Supply Chain Synchronization considerably increases the use of direct shipments and lowers the costs of handling and transport. This theory was applied in a practical case situation at a retailer in the Netherlands, with remarkable results. On the transportation budget for dry grocery alone, potential savings already exceeded 5 million Euro per annum. Further research will try to extend the model to accommodate delays at the consolidation centers, since these delays can increase the available load at consolidation centers, needed for an efficient hub operation.

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Zusammenfassung  In diesem Beitrag wird ein Grundmodell vorgestellt, mit dessen Hilfe eine gemischte Konsolidierungsstrategie untersucht werden kann, die aus direkten und indirekten Verladungen durch lagerlose Konsolidierungszentren besteht. Das Modell kann dazu genutzt werden, potentielle Einsparungen in einem Distributionsnetzwerk des Handels abzusch?tzen. Ausgehend von dem Konsolidierungsmodell der Transporte wird gezeigt, dass die Synchronisation der Lieferkette dazu führt, in erheblichem Ma?e st?rker direkte Verladungen einzusetzen, wobei gleichzeitig die Verwaltungs-und Transportkosten gesenkt werden. Der theoretische Ansatz ist auf ein Handelsunternehmen in den Niederlanden angewandt worden, wobei sich bemerkenswerte Ergebnisse einstellten. Allein im Transportbudget für Lebensmittel konnten bereits über 5 Mio. Euro pro Jahr eingespart werden. Weitere Forschungen werden darauf gerichtet sein, das Modell so zu erweitern, dass Versp?tungen in den Konsolidierungszentren mit behandelt werden k?nnen. Dies ist insofern von besonderem Interesse, da derartige Versp?tungen die Verladungen in den Konsolidierungszentren erh?hen k?nnen, die verfügbar sein müssen, um effiziente Hub-operationen durchzuführen.

     

Production planning and control within a CIM environment: some current developments and requirements for the future

Abstract. This paper considers the integration problems associated with incorporating production planning and control (PP&C) systems within CIM; these problems are typically not differentiated from functionally related problems, and have in the past received relatively little attention. The on-going emergence of a number of standards relevant to manufacturing software systems provides an opportunity to assess the current situation with regard to proprietary PP&C systems and to suggest ways forward towards ‘seamless’ integration of PP&C within the CIM environment. The problems arising from conventional integration approaches are briefly described, and the concept of a simplifying ‘integration platform’ is introduced; the three-schema information architecture is presented as part of this ‘integration simplification’ approach. Current and developing PP&C systems are assessed against a number of information system integration criteria, and the results of a small survey of proprietary packages are presented. The paper concludes that information must be regarded as an enterprise-wide asset, rather than belonging to individual software applications, and that the adoption of relevant standards will enable seamless integration within a three-schema architecture. An increasing number of proprietary packages are adopting standards and methodologies which ease the integration problem significantly.     

A comment on: A note on the EOQ-JIT relationship

In a recently published note in this journal the need for independent control of the production rate (R) and production time (L) was established in order to adapt the economic production quantity (EPQ) model in JIT settings. In this comment we aim to improve the relevance of EPQ in a JIT environment. We focus on two issues, namely, modelling the production rate as a decision variable and also deriving an expession for the optimal number of batches (n* ) for the raw materials and/or subcomponents needed.     

Optimal Strategies for Traditional versus Roth IRA/401(k) Consumption During Retirement

We establish an algorithm that produces an optimal strategy for retirees to withdraw funds between their tax‐deferred accounts (TDAs), like traditional IRA/401(k) accounts, and their Roth IRA/401(k) accounts, in the context of a financial model based on American tax law. This optimal strategy follows a geometrically simple, intuitive approach that can be used to maximize the size of a retiree's bequest to an heir or, alternatively, to maximize a retiree's portfolio longevity. We give examples where retirees following the approach currently implemented by major investment firms, like Fidelity and Vanguard, will reduce their bequests by approximately 10% or lose 18 months of portfolio longevity compared to our optimal approach. Further, our strategy and algorithm can be extended to many cases where the retiree has additional, known yearly sources of money, such as income from part‐time work, taxable investment accounts, and Social Security.      

Production planning and control in automated manufacturing systems

Automated manufacturing systems (AMSs) have the potential for providing a high level of manufacturing performance. Owing to the high cost of capital investment, a high utilization level of AMSs with the help of suitable production planning and control (PPC) is feature of AMSs. Realizing the potential of PPC in AMSs, an attempt has been made to review the available techniques/methods for solving the problems of production planning, control and scheduling in AMSs. The need for further research on PPC of AMSs is brought to the fore along with future research directions.     

Psychopathy and leadership effectiveness: Conceptualizing and testing three models of successful psychopathy

Research on the relationship between psychopathy and leadership effectiveness has adopted very different perspectives on psychopathy. To advance this field of research, the current paper introduces an overarching framework of “successful psychopathy” (Lilienfeld, Watts, & Smith, 2015) to the leadership domain, comprising three conceptual models (the differential-severity model, the moderated-expression model, and the differential-configuration model) and their “hybrid” forms, which are combinations of two or three models. We test the three alternative conceptual models and four hybrid models in two independent samples of leader-subordinate dyads (N₁ = 178 and N₂ = 668) whereby leaders’ self-reported psychopathy is related to a range of subordinate-rated effectiveness criteria, including three performance dimensions and charismatic leadership. A recurrent pattern of findings across both studies provides evidence for differential effects for the various psychopathy subdimensions, whereas little support was found for the models assuming curvilinear and/or moderated effects. Implications for research on leader psychopathy are discussed.