Gruppenarbeit in der Automobilindustrie

Der vorliegende Beitrag behandelt die neueren Auseinandersetzungen um die Ausrichtung der Gruppenarbeit in der Produktion am Beispiel der Automobilindustrie. Anhand von zwei Fallbeispielen aus den Aggregatemontagen sowie der Mechanischen Fertigung wird dafür plädiert, differenzierende Gruppenarbeitskonzepte anzuwenden, die sowohl den unterschiedlichen Produktionserfordernissen wie auch den Belangen der Mitarbeiter Rechnung tragen. Dabei wird berücksichtigt und empirisch nachvollzogen, dass der arbeitsorganisatorische Wandel in der Aggregatefertigung in mehreren Etappen sich vollzogen hat. Es ist unübersehbar, dass die Gruppenarbeitskonzepte sich sukzessive den Leistungserfordernissen der Unternehmen angeglichen haben. In der Rede stehen dabei der teilautonome Gruppenarbeitsansatz, der vor allem Anwendung in der Mechanischen Fertigung findet, sowie der Ansatz standardisierter Gruppenarbeit, der vermehrt in den Montagen der Autofabriken umgesetzt wird.This article deals with the newest debate on team concepts in the production of the automotive industry. By means of two practicle examples of part production and the assembly of automotive gears the author emphasizes the opportunity of various approaches to teamwork in the production. In fact it depends on structure of production what kind of team concept we are able to implement. Looking back on the change of work organization in the last ten years we can show the adaption of team concept to requirements of production. We actually see two approaches of team concept: first more partially autonomous team concepts implemented in part production areas and second team concepts based on standardized work in the assemblies

A Paradox of Plenty? Rent Distribution and Political Stability in Oil States

Resource curse theory claims that resource abundance encourages violent conflict. A study of 37 oil-producing developing countries, however, reveals that oil states with very high levels of oil revenue are remarkably stable. An analysis of the ways in which governments spend oil revenues identifies two distinct types of rentier systems – the large-scale distributive state and the patronage-based system – which are strongly linked to instability or its absence. However, some deviant cases, such as Equatorial Guinea and Gabon, illustrate the need for further research. Apparently, the notion of a “paradox of plenty” has neglected rentier mechanisms that avoid conflict.Resource Curse, Paradox of Plenty, Oil, Rentier State, Violent Conflict, Political Stability, Developing World

A Paradox of Plenty? Rent Distribution and Political Stability in Oil States

Resource curse theory claims that resource abundance encourages violent conflict. A study of 37 oil-producing developing countries, however, reveals that oil states with very high levels of oil revenue are remarkably stable. An analysis of the ways in which governments spend oil revenues identifies two distinct types of rentier systems - the large-scale distributive state and the patronage-based system - which are strongly linked to instability or its absence. However, some deviant cases, such as Equatorial Guinea and Gabon, illustrate the need for further research. Apparently, the notion of a 'paradox of plenty' has neglected rentier mechanisms that avoid conflict.Die Theorie des Ressourcenfluchs behauptet, dass Ressourcenreichtum gewaltsame Konflikte begünstigt. Eine Untersuchung von 37 ölproduzierenden Entwicklungsländern zeigt hingegen, dass Länder mit sehr hohen Ölerlösen bemerkenswert stabil sind. Die Analyse der Art und Weise wie Ölstaaten Ressourcenerlöse verwenden, führt zur Bildung zweier distinkter Typen von Rentierstaaten - dem Distributionstyp gegenüber dem Patronage-Typ -, die eine starke Korrelation mit politischer Instabilität oder deren Abwesenheit aufweisen. Einige abweichende Fälle, wie anhand der Fallstudien Äquatorial-Guinea und Gabun gezeigt werden kann, weisen aber auf die Notwendigkeit zukünftiger Forschung hin. Offenbar hat die Forschung zum 'Paradox of Plenty' und 'Ressourcenfluch' Rentiermechanismen vernachlässigt, die gewaltsame Konflikte verhindern können

Nonrigid reconstruction of 3D breast surfaces with a low-cost RGBD camera for surgical planning and aesthetic evaluation

Accounting for 26% of all new cancer cases worldwide, breast cancer remains the most common form of cancer in women. Although early breast cancer has a favourable long-term prognosis, roughly a third of patients suffer from a suboptimal aesthetic outcome despite breast conserving cancer treatment. Clinical-quality 3D modelling of the breast surface therefore assumes an increasingly important role in advancing treatment planning, prediction and evaluation of breast cosmesis. Yet, existing 3D torso scanners are expensive and either infrastructure-heavy or subject to motion artefacts. In this paper we employ a single consumer-grade RGBD camera with an ICP-based registration approach to jointly align all points from a sequence of depth images non-rigidly. Subtle body deformation due to postural sway and respiration is successfully mitigated leading to a higher geometric accuracy through regularised locally affine transformations. We present results from 6 clinical cases where our method compares well with the gold standard and outperforms a previous approach. We show that our method produces better reconstructions qualitatively by visual assessment and quantitatively by consistently obtaining lower landmark error scores and yielding more accurate breast volume estimates

A comparative study of breast surface reconstruction for aesthetic outcome assessment

Breast cancer is the most prevalent cancer type in women, and while its survival rate is generally high the aesthetic outcome is an increasingly important factor when evaluating different treatment alternatives. 3D scanning and reconstruction techniques offer a flexible tool for building detailed and accurate 3D breast models that can be used both pre-operatively for surgical planning and post-operatively for aesthetic evaluation. This paper aims at comparing the accuracy of low-cost 3D scanning technologies with the significantly more expensive state-of-the-art 3D commercial scanners in the context of breast 3D reconstruction. We present results from 28 synthetic and clinical RGBD sequences, including 12 unique patients and an anthropomorphic phantom demonstrating the applicability of low-cost RGBD sensors to real clinical cases. Body deformation and homogeneous skin texture pose challenges to the studied reconstruction systems. Although these should be addressed appropriately if higher model quality is warranted, we observe that low-cost sensors are able to obtain valuable reconstructions comparable to the state-of-the-art within an error margin of 3 mm.Comment: This paper has been accepted to MICCAI201

Universal properties of knotted polymer rings

By performing Monte Carlo sampling of $N$-steps self-avoiding polygons embedded on different Bravais lattices we explore the robustness of universality in the entropic, metric and geometrical properties of knotted polymer rings. In particular, by simulating polygons with $N$ up to $10^5$ we furnish a sharp estimate of the asymptotic values of the knot probability ratios and show their independence on the lattice type. This universal feature was previously suggested although with different estimates of the asymptotic values. In addition we show that the scaling behavior of the mean squared radius of gyration of polygons depends on their knot type only through its correction to scaling. Finally, as a measure of the geometrical self-entanglement of the SAPs we consider the standard deviation of the writhe distribution and estimate its power-law behavior in the large $N$ limit. The estimates of the power exponent do depend neither on the lattice nor on the knot type, strongly supporting an extension of the universality property to some features of the geometrical entanglement.Comment: submitted to Phys.Rev.

Phase transitions in a gas of anyons

We continue our numerical Monte Carlo simulation of a gas of closed loops on a 3 dimensional lattice, however now in the presence of a topological term added to the action corresponding to the total linking number between the loops. We compute the linking number using certain notions from knot theory. Adding the topological term converts the particles into anyons. Using the correspondence that the model is an effective theory that describes the 2+1-dimensional Abelian Higgs model in the asymptotic strong coupling regime, the topological linking number simply corresponds to the addition to the action of the Chern-Simons term. We find the following new results. The system continues to exhibit a phase transition as a function of the anyon mass as it becomes small \cite{mnp}, although the phases do not change the manifestation of the symmetry. The Chern-Simons term has no effect on the Wilson loop, but it does affect the {\rm '}t Hooft loop. For a given configuration it adds the linking number of the 't Hooft loop with all of the dynamical vortex loops to the action. We find that both the Wilson loop and the 't Hooft loop exhibit a perimeter law even though there are no massless particles in the theory, which is unexpected.Comment: 6 pages, 5 figure

Pilus distribution among lineages of group b <i>streptococcus</i>: an evolutionary and clinical perspective

&lt;b&gt;Background&lt;/b&gt;&lt;p&gt;&lt;/p&gt; Group B Streptococcus (GBS) is an opportunistic pathogen in both humans and bovines. Epidemiological and phylogenetic analyses have found strains belonging to certain phylogenetic lineages to be more frequently associated with invasive newborn disease, asymptomatic maternal colonization, and subclinical bovine mastitis. Pilus structures in GBS facilitate colonization and invasion of host tissues and play a role in biofilm formation, though few large-scale studies have estimated the frequency and diversity of the three pilus islands (PIs) across diverse genotypes. Here, we examined the distribution of pilus islands (PI) 1, 2a and 2b among 295 GBS strains representing 73 multilocus sequence types (STs) belonging to eight clonal complexes. PCR-based RFLP was also used to evaluate variation in the genes encoding pilus backbone proteins of PI-2a and PI-2b.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Results&lt;/b&gt;&lt;p&gt;&lt;/p&gt; All 295 strains harbored one of the PI-2 variants and most human-derived strains contained PI-1. Bovine-derived strains lacked PI-1 and possessed a unique PI-2b backbone protein allele. Neonatal strains more frequently had PI-1 and a PI-2 variant than maternal colonizing strains, and most CC-17 strains had PI-1 and PI-2b with a distinct backbone protein allele. Furthermore, we present evidence for the frequent gain and loss of genes encoding certain pilus types.&lt;p&gt;&lt;/p&gt; &lt;b&gt;Conclusions&lt;/b&gt;&lt;p&gt;&lt;/p&gt; These data suggest that pilus combinations impact host specificity and disease presentation and that diversification often involves the loss or acquisition of PIs. Such findings have implications for the development of GBS vaccines that target the three pilus islands