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Germany received around 300,000 refugee newcomers ages 16–25 in 2015. Educational participation is a key process for the integration of these young people. This is especially true for the German vocational education and training (VET) system that provides opportunities for a fast and successful transition into the labor market. The few extant studies on migrant students in Germany have shown considerable problems in achieving educational equity. Based on the theoretical assumption that systemic discrimination creates important barriers to educational equity, we investigate how institutional and systemic factors infl uence the educational participation of refugee-background youth and how these youth cope with such barriers. Using a two-case study in the cities of Hamburg and Munich, we performed a meta-analysis of research reports, complemented by secondary analysis of primary data. Results show institutional barriers in both the education and asylum systems, and that youth cope with these barriers through high educational aspirations.
A surface recognition algorithm capable of determining contact surfaces types by means of tactile sensor fusion is proposed. The authors present a recognition processes for 3-dimensional deformations in a 2-dimensional parametric domain. Tactile information is extracted by physical contact with a grasped object through a sensing medium. Information is obtained directly at the interface between the object and the sensing device and relates to three-dimensional position and orientation of the object in the presence of noise. The technique called “eigenvalue trajectory analysis”, is introduced and adopted for specifying the margin of classification and classification thresholds. The authors demonstrate mathematically that this approach, which complements existing work, offers significant computational advantages when applied to challenging contact scenarios such as dynamic recognition of contact deformations.
This article takes stock of 99 journals dedicated to the field of entrepreneurship research and examines their evaluations and impact. It compares several journal quality assessments, the Australian ERA 2010, ABDC 2010 and UQ 2011 lists, with other international rankings and with highly regarded impact measurements. In a following section, the H-Index and the HC-Index for journals are introduced. The H-Indices are Google Scholar based impact measurements which can be easily executed by anyone. The results for the entrepreneurship journals H-Indices are compared with other impact factors and with journal rankings from Australia and elsewhere. Results reveal that rankings are incomplete in regard to entrepreneurship journals and that many rankings are inconsistent when compared to impact measurements. This holds true even for the ERA and the ABDC 2010 lists, even though these are among the most appropriate lists.
This work integrates two distinct research areas of parallel and distributed computing, (1) automatic loop parallelization, and (2) component-based Grid programming. The latter includes technologies developed within CoreGRID for simplifying Grid programming: the Grid ComponentModel (GCM) and Higher- Order Components (HOCs). Components support developing applications on the Grid without taking all the technical details of the particular platform type into account (network communication, heterogeneity, etc.). The GCMenables a hierarchical composition of programpieces and HOCs enable the reuse of component code in the development of new applications by specifying application-specific operations in a program via code parameters. When a programmer is provided, e. g., with a compute farm HOC, only the independent worker tasks must be described. But, once an application exhibits data or control dependences, the trivial farm is no longer sufficient. Here, the power of loop parallelization tools, like LooPo, comes into play: by embedding LooPo into a HOC, we show that these two technologies in combination facilitate the automatic transformation of a sequential loop nest with complex dependences (supplied by the user as a HOC parameter) into an ordered task graph, which can be processed on the Grid in parallel. This technique can significantly simplify GCM-based systems which combine multiple HOCs and other components. We use an equation system solver based on the successive overrelaxation method (SOR) as our motivating application example and for performance experiments.
Computational grids combine computers in the Internet for distributed data processing and are an attractive platform for the data-intensive applications of bioinformatics. We present an extensible genome processing software for the grid and evaluate its performance. Our software was able to discover previously unknown circular permutations (CP) in the ProDom database containing more than 70MB of protein data. A specific feature of our software is its design as a component: the Alignment HOC, a Higher-Order Component that makes use of the latest Globus toolkit as grid middleware. Besides genome data, the Alignment HOC accepts plugin code for processing this data as its input, and contains all the required configuration to run the component on top of Globus, thus, freeing the non-grid-expert user from dealing with grid middleware. Instead of writing data distribution procedures and configuring the middleware appropriately for every new algorithm, Alignment HOC users reuse the existing component and only write application-specific plugins. To maintain plugins persistently in a reusable manner, we built a web-accessible plugin database with a comfortable administration GUI. The flexible component-based implementation makes it easy to study CPs in other databases (e.g. UniProt/Swiss-Prot) or to use an alignment algorithm different than the standard Needleman-Wunsch. For the efficient distribution of workload, we developed a library of group communication operations for HOCs.
Due to a constantly growing interest in construction robots, guidance on the design and management for its development process is needed to employ the best practice know-how and accelerate efficient development and marketisation. The development of construction robots usually involves stakeholders from the construction sector, non-construction sectors, and investors. A systematic design management method can help to integrate the needs and aims of different stakeholders and team members during the development process. Therefore, a procedure model for the development of construction robots is proposed as an integrative guidance on how to systematically conceptualise engineer requirements and to design, develop, implement, evaluate, manage, and mature the designs of construction robots. Several recent projects have been used by the authors to test and verify parts of the proposed cyclic method. In addition, the authors explain how the proposed model has been composed of an adapted set of proven principles and methodologies from the systems engineering and management field and highlight the specific concepts for developing and testing the construction robots. The application of the procedure model revealed that the concept and method are feasible and, in principle, can provide a comprehensive and practical guide on the steps forward. A unique characteristic of the proposed procedure model is the core principle which allows the evolvement over time with each cycle of use. In addition, interchangeable elements can be inserted into the procedure model depending on the region, type of robot, and technical readiness level.
The growing complexity of the digital ecosystem in combination with increasing global risks has created the following dilemma. Overemphasizing cybersecurity may violate fundamental values
like equality, fairness, freedom, or privacy but neglecting cybersecurity could undermine citizens’ trust and confidence in the digital infrastructure as well as in policy makers and state authorities. In order to increase our understanding of this dilemma, this contribution aims to provide an overview on value conflicts in cybersecurity based on a systematic review on the ethical, legal and
technological literature on cybersecurity. It shall be emphasized that a focus on the opposition of cybersecurity vs. privacy is insufficient for understanding the ethical complexity of cybersecurity.
The tightening of the emission legislation and political and social demands for sustainable mobility are forcing the automotive industry to develop complex, high precision mechatronic drive systems. The increasing precision of mechatronic components generally leads to an increase in structural excitation and thus to a rise in noise. The so-called ticking of the fuel injection system has a rather low sound pressure level compared to the residual engine noise. Nevertheless, the impulsive and high frequency noise character leads to a decline concerning the perception of comfort and sound quality. In order to identify the sound quality of fuel injection systems as a frontloading measure, a system test bench has been developed which represents the structure-borne and airborne sound radiation of the stand-alone injection system in a close to series configuration. In this paper, measures for the acoustic optimization of injection systems and their effects on the robustness of the system are discussed. The focus is on engine idling, since at this operating point the ticking of the injectors and high-pressure pump can be perceived most clearly due to the low masking effects of other noise sources. For this purpose, the injection parameters were measured during full engine operation and transferred to the system test bench. By using a special development control unit, it was possible to modify the parameters, quantify their influence on the acoustic behavior and, based on this, define NVH optimized control strategies. For the robustness evaluation of the NVH optimized control strategies, key functions of the injection system were analyzed under varying boundary conditions in system operation on an injection rate test bench.
The paper deals with the investigation of magneto-sensitive elastomers(MSE) and their application in technical actuator systems. MSE consist of an elasticmatrix containing suspended magnetically soft and/or hard particles. Additionally,they can also contain silicone oil, graphite particles, thermoplastic components, etc.,in various concentrations in order to tune specific properties such as viscosity, con-ductivity and thermoelasticity, respectively. The focuses of investigations are thebeneficial properties of MSE in prototypes for locomotion and manipulation purposesthat possess an integrated sensor function. The research follows the principle of amodel-based design, i.e. the working steps are ideation, mathematical modelling,material characterization as well as building first functional models (prototypes). Thedeveloped apedal (without legs) and non-wheeled locomotion systems use the inter-play between material deformations and the mechanical motion in connection with theissues of control and stability. Non-linear friction phenomena lead to a monotonousforward motion of the systems. The aim of this study is the design of such mechanicalstructures, which reduce the control costs. The investigations deal with the movementand control of‘intelligent’mechanisms, for which the magnetically field-controlledparticle-matrix interactions provide an appropriate approach. The presented grippersenclose partially gripped objects, which is an advantage for handling sensitive objects.Form-fit grippers with adaptable contour at the contact area enable a uniform pressuredistribution on the surface of gripped objects. Furthermore, with the possibility ofactive shape adaptation, objects with significantly differing geometries can be gripped.To realise the desired active shape adaptation, the effect of field-induced plasticity ofMSE is used. The first developed prototypes mainly confirm the functional principles assuch without direct application. For this, besides the ability of locomotion andmanipulation itself, further technological possibilities have to be added to the systems.