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781.
Christian Lackner 《Gruppendynamik und Organisationsberatung》2001,32(3):281-290
Communication, in intercultural contexts, is not only confronted with different customs dealing with the time concept of various countries of origin. Considerable time is needed when communication breaks down in groups when coping with language and other cultural problems. When people have subject specific things in common, they are more able to overcome cultural differences and, to a certain extent increase understanding between each other. Intercultural groups seem to communicate quicker in this case than those who lack compatibility because they are not subject to the respective culture-bound ways of working in cross-cultural groups which hinder communication. 相似文献
782.
We consider the non homogeneous gamma process as a degradation model. The hitting time of a deterministic or random level is studied here. We provide its distribution (both cdf and pdf) explicitly in the first case and in the second case when the threshold is exponentially or gamma distributed. The general case for a random threshold can be approximated by considering mixtures of Erlang distributions. Aging properties are also discussed in this article. 相似文献
783.
The unique copula of a continuous random pair \((X,Y)\) is said to be radially symmetric if and only if it is also the copula of the pair \((-X,-Y)\) . This paper revisits the recently considered issue of testing for radial symmetry. Three rank-based statistics are proposed to this end which are asymptotically equivalent but simpler to compute than those of Bouzebda and Cherfi (J Stat Plan Inference 142:1262–1271, 2012). Their limiting null distribution and its approximation using the multiplier bootstrap are discussed. The finite-sample properties of the resulting tests are assessed via simulations. The asymptotic distribution of one of the test statistics is also computed under an arbitrary alternative, thereby correcting an error in the recent work of Dehgani et al. (Stat Pap 54:271–286, 2013). 相似文献
784.
This article combines Social Choice Theory with Discrete Optimization. We assume that individuals have preferences over edges
of a graph that need to be aggregated. The goal is to find a socially “best” spanning tree in the graph. As ranking all spanning
trees is becoming infeasible even for small numbers of vertices and/or edges of a graph, our interest lies in finding algorithms
that determine a socially “best” spanning tree in a simple manner. This problem is closely related to the minimum (or maximum)
spanning tree problem in Discrete Optimization. Our main result shows that for the various underlying ranking rules on the
set of spanning trees discussed in this article, the sets of “best” spanning trees coincide. Moreover, a greedy algorithm
based on a transitive group ranking on the set of edges will always provide such a “best” spanning tree. 相似文献
785.
786.
Erfassung betriebswirtschaftlich relevanter Zeitschriften in den ISI-Datenbanken sowie der Scopus-Datenbank 总被引:1,自引:1,他引:0
Zusammenfassung Publikations- und Zitationsindizes k?nnen insbesondere zur Quellenerschlie?ung und Forschungsevaluation genutzt werden. Die
Eignung entsprechender Indizes zur ad?quaten Erfüllung dieser Funktionen h?ngt ma?geblich von der Auswahl der indexierten
Publikationen ab. In diesem Beitrag wird die Publikationsauswahl des Social Sciences Citation Index (SSCI), des Science Citation
Index-Expanded (SCI-X) und der Datenbank Scopus aus Sicht der deutschsprachigen Betriebswirtschaftslehre analysiert. Als Basis
für die Untersuchung dienen die Ergebnisse des VHB-JOURQUAL. Neben einem Gesamtüberblick zur Erfassung betriebswirtschaftlich
relevanter Zeitschriften in den Datenbanken wird auch die Abdeckung einzelner betriebswirtschaftlicher Forschungsfelder untersucht.
Da die Nutzung der Indizes mit einigen Kosten für den Erwerb entsprechender Lizenzen verbunden ist, erfolgt darüber hinaus
eine vergleichende Analyse von SSCI, SCI-X und Scopus hinsichtlich der Zeitschriftenabdeckung. Aufgrund der internationalen
Ausrichtung der betrachteten Zitationsindizes wird die Untersuchung zus?tzlich auf ein internationales Zeitschriftenranking
ausgedehnt.
Acquisition of economic journals in the ISI-databases and in Scopus
Summary Publication- and citation-indices are especially used for searching literature and evaluating research performance. Their suitability strongly depends on the publications taken into account. In this paper we analyse the selection of publications in Social Sciences Citation Index (SSCI), Science Citation Index-Expanded (SCI-X) and Scopus for G erman speaking researchers of business economics. Therewith, the VHB-JOURQUAL provides a basis for our analysis. In addition to an overview of economic relevant journals in the indices we analyse the coverage of special fields of business economics. Due to the fact that using such indices is very expensive, we compare SSCI, SCI-X and Scopus concerning their coverage of journals. As the indices are of international orientation, we enlarge the analysis onto an international ranking of publications.
相似文献
787.
Aftermarket sales and profits are becoming an increasingly important part of an original equipment manufacturer's (OEM) business model. Because replacement parts often do not require further manufacturing, OEMs act as intermediaries in the aftermarket. As with any intermediary, the OEM must concern itself with suppliers disintermediating its supply chain selling replacement parts directly to the OEM's customers. We frame supply chain disintermediation (SCD) as a principal–agent contracting problem between an OEM buyer and a supplier. Hypotheses relate contract conditions, goal incongruence, supplier capabilities and contract enforcement to SCD. The data are collected from the aerospace industry using a multimethod study, combining an Internet‐based survey with archival data. Causal modeling with structural equation modeling (SEM) shows general support for the hypotheses. Particularly, SCD is positively related to buyer–supplier goal incongruence. The agency model offers insights that differ from previous transaction‐cost‐based models of buyer–supplier relationships. OEM buyers with a lucrative aftermarket should consider aligning goals through incentives rather than relying entirely on economic hostages associated with specific assets. 相似文献
788.
789.
Sequence alignment is a central problem in bioinformatics. The classical dynamic programming algorithm aligns two sequences
by optimizing over possible insertions, deletions and substitutions. However, other evolutionary events can be observed, such
as inversions, tandem duplications or moves (transpositions). It has been established that the extension of the problem to
move operations is NP-complete. Previous work has shown that an extension restricted to non-overlapping inversions can be
solved in O(n
3) with a restricted scoring scheme. In this paper, we show that the alignment problem extended to non-overlapping moves can
be solved in O(n
5) for general scoring schemes, O(n
4log n) for concave scoring schemes and O(n
4) for restricted scoring schemes. Furthermore, we show that the alignment problem extended to non-overlapping moves, inversions
and tandem duplications can be solved with the same time complexities. Finally, an example of an alignment with non-overlapping
moves is provided.
A preliminary version of this paper appeared in the Proceedings of COCOON 2007, LNCS, vol. 4598, pp. 151–164. 相似文献
790.
Most methods for survival prediction from high-dimensional genomic data combine the Cox proportional hazards model with some
technique of dimension reduction, such as partial least squares regression (PLS). Applying PLS to the Cox model is not entirely
straightforward, and multiple approaches have been proposed. The method of Park et al. (Bioinformatics 18(Suppl. 1):S120–S127,
2002) uses a reformulation of the Cox likelihood to a Poisson type likelihood, thereby enabling estimation by iteratively
reweighted partial least squares for generalized linear models. We propose a modification of the method of park et al. (2002)
such that estimates of the baseline hazard and the gene effects are obtained in separate steps. The resulting method has several
advantages over the method of park et al. (2002) and other existing Cox PLS approaches, as it allows for estimation of survival
probabilities for new patients, enables a less memory-demanding estimation procedure, and allows for incorporation of lower-dimensional
non-genomic variables like disease grade and tumor thickness. We also propose to combine our Cox PLS method with an initial
gene selection step in which genes are ordered by their Cox score and only the highest-ranking k% of the genes are retained, obtaining a so-called supervised partial least squares regression method. In simulations, both
the unsupervised and the supervised version outperform other Cox PLS methods. 相似文献