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The paper recommends an approach to estimate effectively the probability of buffer overflow in high-speed communication networks, capable of carrying diverse traffic, including self-similar teletraffic, and supporting diverse levels of quality of service. Simulations with stochastic, long-range dependent self-similar traffic source models are conducted. A new efficient algorithm, based on a variant of the RESTART/LRE method, is developed and applied to accelerate the buffer overflow simulation in a finite buffer single server model under long-range dependent self-similar traffic load with different buffer sizes. Numerical examples and simulation results are shown
In a recent paper it has been shown that the effective nonlinear constant which is used in a P-Matrix approach to describe third-order intermodulation (IMD3) in surface acoustic wave (SAW) devices can be obtained from finite element (FEM) calculations of a periodic cell using nonlinear tensor data [1]. In this paper we extend this FEM calculation and show that the IMD3 of an infinite periodic array of electrodes on a piezoelectric substrate can be directly simulated in the sagittal plane. This direct approach opens the way for a FEM based simulation of nonlinearities for finite and generalized structures avoiding the simplifications of phenomenological approaches.
Additive manufacturing (AM), or 3D printing (3DP), has increasingly become more wide-spread and applied to a great degree over the past years. Along with that, the necessity for training courses which impart the required knowledge for product development with 3D printing rises. This article will introduce a “Rapid Prototyping” workshop which should convey to students the technical and creative knowledge for product development in using additive manufacturing. In this workshop, various 3D printers are initially installed and put into operation for the construction of self-assembly kits during the introduced training course. Afterwards, the students use databanks to select and download suitable components for the 3D print on the basis of criteria. Lastly, the students develop several assembly kits independently and establish design guidelines based on their experience. The students likewise learn to estimate and evaluate economic boundaries such as, e.g. costs and delivery times. For a start, it is a new approach to be using various assembly kits. These are up to date with current technology and dispose of features such as, e.g., additional nozzles for support material and heated building platforms. Moreover, a comprehensive evaluation of the training success will be conducted. The students’ level of knowledge in various areas will also be determined and compared with surveys taken before and after the conducting of the workshops. Additionally, cost and delivery time estimates and knowledge of databanks will be determined through concrete questioning.
A number of design rules must be adhered to in the development and manufacturing of unmanned aerial vehicles. In this, additive manufacturing, particularly in the implementation of requirements with respect to light-weight construction and sustainability, offers several advantages compared to conventional manufacturing methods. Therefore, this article will primarily introduce and compare current concepts for sustainable design using additive manufacturing. These will, above all, consist of the production of complete fuselages and wings by means of rapid prototyping or also rapid tooling. In addition, a new concept will be introduced in which a UAV using AM can be implemented through the combination of very light components and a preferably resource-saving manufacturing method. In this process, a three-dimensional spaceframe is used in combination with a covering in the construction of the wing. Hereby, the development process for sustainable design using additive manufacturing will be analyzed and the results will be explained by means of concrete case studies. In conclusion, the results of these case studies will be compared to the latest technology regarding wing span load.
All business is local
(2016)
This paper presents the results of the idea generation experiment that repeats the study originally conducted at RMIT. In order to establish the influence that the experimental treatments make on the number and the breadth of solution ideas proposed by problem solvers with different knowledge levels, students from different years of study were recruited. Ninety students from the Offenburg University of Applied Sciences, Germany were divided into three groups. All students were asked to generate ideas on cleaning lime deposits from the inside of a water pipe and were given 16 minutes to record their individual ideas. Students of two experimental groups were shown some words for two minuted each. The Su-Field group was exposed to the eight fields of MATCEMIB. The Random Word group was shown eight random words every two minutes. The Su-Field group outperformed both the Control group and the Random Word group in the number of ideas generated. It was also found that the students from the Su-Field group proposed significantly broader solutions than the students from the Control and Random Word groups. The overall results of the experiment support the conclusions made by the RMIT researchers that simple ideation techniques can significantly improve idea generation and that the systematised Substance-Field Analysis is a suitable heuristic for engineering students.
To successfully support private sector development in Africa by the use of trade and export promotion instruments, a comprehensive policy framework is crucial. Different institutional setups for development support show different levels of resilience and effectiveness in coping with the economic conditions they are exposed to. However, there is strong evidence that managing the interplay of three fundamental building blocks – public policy, focus areas, strategic objectives and critical success factors as well as institutions, is the key to crafting sustainable and responsive economies. Export plays a significant role in the national economy, and innovative and integrated government financing instruments have to successfully support the competitiveness of national companies in the global economy. Financing and supporting foreign trade with private businesses in Africa occupies a pivotal role, impacting from new product development and job creation in developed countries through economic growth and human development in African countries.