Low temperature cofiring ceramic (LTCC) combines hybrid technology, biocompatibility, chemical resistance and ease of fabrication to serve as a construction material for microfluidics. Due to the lack of CAD tools for...
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Low temperature cofiring ceramic (LTCC) combines hybrid technology, biocompatibility, chemical resistance and ease of fabrication to serve as a construction material for microfluidics. Due to the lack of CAD tools for MEMS this paper applies a model for the description of stationary flow in LTCC channels of non circular cross sections. Sample devices for validation are fabricated by laser structuring and standard LTCC process. The substrates consist of 130 mum thick layers and are connected horizontally to a tubing system. Characteristic length scales range between 131 mum and 159 mum. Deviations stay within the assumed uncertainty and confirm the theory. Results show that applying solutions of geometry description in accepted fluid mechanics models gives an appropriate tool for flow description. Implementing the model as a network description in the describing language MOSILAB can allow dimensioning and optimization under functional restrictions, e.g. pressure drop or geometry as well as communication with other modeling tools
Code generators are increasingly used in an industrial context to translate graphical models into executable code. Since the code is often deployed in safety-related environments, the quality of the code generators is...
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Early parallel architectures where shared memory systems (UMA, NUMA), which had the disadvantage of the shared memory bottleneck that limited the scalability of the system. In contrast, distributed memory architecture...
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Early parallel architectures where shared memory systems (UMA, NUMA), which had the disadvantage of the shared memory bottleneck that limited the scalability of the system. In contrast, distributed memory architectures with message passing (NORMAs) provided any desired scalability; however, at the cost of a substantial communication latency. The latency could be reduced by custom communication hardware (examples: SUPRENUM, MANNA) yet since there was still a software routine involved, the remaining latency was in the order of microseconds. Therefore, and because of the simpler programming model of shared memory, it became the trend of the nineties to return to UMAs and NUMAs, employing powerful communication hardware to minimize the remote memory access time.
From the Publisher: Every book out there so far describes how to build Web Services, with some explanation on the creation of the clients. The Web Service design should mean that the client developer need never know t...
ISBN:
(纸本)9781861007025
From the Publisher: Every book out there so far describes how to build Web Services, with some explanation on the creation of the clients. The Web Service design should mean that the client developer need never know theinsides of the application. This book expains how to build Web Faceplates for these services.
Janus is a conceptual framework and C++ template library that provides a flexible and extensible collection of efficient data structures and algorithms for a broad class of data-parallel applications. In particular, f...
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Janus is a conceptual framework and C++ template library that provides a flexible and extensible collection of efficient data structures and algorithms for a broad class of data-parallel applications. In particular, finite difference methods, (adaptive) finite element methods, and data-parallel graph algorithms are supported. An outstanding advantage of providing a generic C++ framework is that it provides application-oriented abstractions that achieve high performance without relying on language extension or non-standard compiler technology. The C++ template mechanism allows to plug user-defined types into the Janus data structures and algorithms. Moreover, Janus components can easily be combined with standard software packages of this field.
作者：
Hannebauer, MarkusPlanning and Optimization Laboratory
Research Institute for Computer Architecture and Software Technology (FIRST) GMD — German National Research Center for Information Technology eMail: hannebau@first.gmd.de
Several interesting practical problems in process control, planning and scheduling can be expressed and solved using the model of constraint satisfaction problems. At least four drawbacks of this classical model direc...
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Several interesting practical problems in process control, planning and scheduling can be expressed and solved using the model of constraint satisfaction problems. At least four drawbacks of this classical model directly relate to areas of distribution: complexity, scalability, privacy and robustness. Hence, research on distributed constraint satisfaction problems is a new direction in the area of multi-agent systems. A typical engineering task in distributed constraint satisfaction is the design of the distribution itself. A careful look at this task reveals that the design of distribution is critical to the quality and efficiency of the problem solving process and is itself an optimization problem. In this article we formalize different variants of this configuration problem and prove them to be all at least N P-complete. For solving these problems, we present two local operators, agent melting and agent splitting, that can be combined to allow for an autonomous and dynamic reconfiguration of the organizational structure of the problem-solving agents. We prove sequences of these operators to be sufficient for solving any given configuration problem. We also briefly describe what practical steps are necessary to exploit the rather theoretical result of the proof in realistic applications.
Handling the procedure interface in an HPF compiler is complex due to the many possible combinations of Fortran 90/HPF properties of an actual array argument and its associated dummy argument. This paper describes an ...
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This paper presents a modeling approach based on deterministic and stochastic Petri nets (DSPN) for analyzing the performance of node architectures for MIMD multiprocessor systems with distributed memory. DSPN are a n...
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This paper presents a modeling approach based on deterministic and stochastic Petri nets (DSPN) for analyzing the performance of node architectures for MIMD multiprocessor systems with distributed memory. DSPN are a numerically solvable modeling formalism with a graphical representation. The modeling approach supports design decisions for node architectures by providing quantitative results concerning processor and memory utilization for several design alternatives. To illustrate the proposed approach, DSPN of two node architectures are presented and employed for a comparative performance study.
Recent investigations have shown that vehicular traffic is the main source for emissions leading to summer smog. A study of the impact of traffic emission on urban air quality requires a complex air-pollution simulati...
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Recent investigations have shown that vehicular traffic is the main source for emissions leading to summer smog. A study of the impact of traffic emission on urban air quality requires a complex air-pollution simulation system. This paper presents results of the development and application of an air-pollution simulation system at GMD first which aims at supporting users in government administration and industry with forecasting and operative decision-making as well as short- to long-term regional planning. The components of the simulation system are parallelly implemented simulation models for meteorology, transport and air chemistry, data bases for model input and simulation results, as well as a graphic user interface for spatial data visualization. In order to study the influence of traffic emissions, a traffic-flow and a traffic-emission model have been added to the simulation system. Results presented are from two recent applications in the regions of Berlin/Brandenburg and Munich (Germany). Further applications are in preparation.
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