A flux compression unit (FCPU) is being power developed to generate tailored millisecond current pulses for ETC gun applications. A propellant mixture is used to accelerate a conducting piston into the magnetic field ...
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A flux compression unit (FCPU) is being power developed to generate tailored millisecond current pulses for ETC gun applications. A propellant mixture is used to accelerate a conducting piston into the magnetic field region within a helical coil. Repetitive operation may be obtained by using the compressed magnetic field to stop the piston at the end of the useful compression stroke and return it to the starting position. FCPU point of departure design parameters for a proof-of-principle experiment include: 120-mm bore diameter, 75-cm coil length, 80 turns/m, 15-kA seed current (7.2-kJ initial energy), 3.5-kg piston initially accelerated to 300 m/s. Simulations predict a FCPU current multiplication of 40x, 95 kJ delivered to a fixed resistance load, and the stopping of the piston. Scaling analyses and initial experiments using solid propellants to accelerate the piston are reported. Details of the design, construction and check-out tests of the FCPU have been previously reported.
Feature interactions occur when the composition of two processes produces unexpected or unwanted behaviors. the problem of detecting interactions can be formalized, but the resolution of such interactions remains almo...
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Financial analysis is based on complex concepts and rules;its goal is to propose problem-adapted solutions. the evaluation of a particular financial situation has to consider human factors like savers risk tolerance a...
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ISBN:
(纸本)3540660763
Financial analysis is based on complex concepts and rules;its goal is to propose problem-adapted solutions. the evaluation of a particular financial situation has to consider human factors like savers risk tolerance and consumers behaviour. It also has to consider political factors like interest rates variations and currency policy. the financial planner has to analyze the client's financial situation to elaborate a financial portfolio adapted to his or her needs. On the grounds of the nature and the diversity of the parameters describing a client's financial profile, we need toolsthat will memorize and reuse this information in different situations. In order to provide training and evaluation tools for financial analysts, we propose a system called FIPS (Financial Planification System) using Case-Based Reasoning. In FIPS, case-based reasoning is used in the case retrieval process, and also in a reflexive way during the adaptation stage. FIPS proposes to the learner the client's data like financial goals, acceptable risk, income etc., and expects a balanced financial portfolio suggested by the student. It uses old cases already treated and memorized, to propose an adapted solution that is compared to the learner's solution. the learner's evaluation is based on the distance between the solution provided by the system and the solution suggested by the learner.
Model checking is emerging as a practical tool for automated debugging of complex reactive systems such as embedded controllers and network protocols (see [20] for a survey). In model checking, a high-level descriptio...
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this paper presents a strategy to handle incomplete knowledge during acquisition process. the goal of this research is to develop formal toolsthat benefit the law of semantic balance. the assumption is used that a si...
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the i-protocol, an optimized sliding-window protocol for GNU UUCP, came to our attention two years ago when we used the Con-currency Factory’s local model checker to detect, locate, and correct a non-trivial livelock...
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the European Laboratory for Particle Physics (CERN) is constructing the Large Hadron Collider (LHC). Two counter-rotating proton beams will be injected into the LHC at an energy of 450 GeV by two kicker magnet systems...
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the European Laboratory for Particle Physics (CERN) is constructing the Large Hadron Collider (LHC). Two counter-rotating proton beams will be injected into the LHC at an energy of 450 GeV by two kicker magnet systems, producing magnetic field pulses of approximately 900 ns rise time and 6.6 /spl mu/s flat top duration with a ripple of less than /spl plusmn/0.5%. Both injection systems are composed of 4 travelling wave kicker magnets of 2.17 m length each, powered by pulse forming networks (PFNs). To achieve the high-required kick strength of 1.2 Tm, for a compact and cost efficient design, a characteristic impedance of 5 Ohms has been chosen. the design strategy for the magnets and generators has been defined after detailed analysis of existing systems. the electrical circuit has been optimised using the circuit analysis software PSpice. Most known parasitics have been modelled. A prototype PFN has been constructed at CERN and successfully tested at 60 kV. A calibration procedure has been developed and utilised for obtaining correction data for a high voltage probe and oscilloscope amplifier. Measurements carried out with a precision of approximately /spl plusmn/0.1% show that the prototype PFN conforms to the specifications and the PSpice predictions.
We present an automated abstract verification method for infinite-state systems specified by logic programs (which are a uniform and intermediate layer to which diverse formalisms such as transition systems, pushdown ...
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ISBN:
(纸本)3540643567
We present an automated abstract verification method for infinite-state systems specified by logic programs (which are a uniform and intermediate layer to which diverse formalisms such as transition systems, pushdown processes and while programs can be mapped). We establish connections between: logic program semantics and CTL properties, set-based program analysis and pushdown processes, and also between model checking and constraint;solving, via. theorem, proving. We show that set-based analysis can be used to compute supersets of the values of program variables in the states that satisfy a given CTL property.
In this paper we present the multi process verification of SDL systems at the Siemens mobile phone department. the formal verification is efficiently performed by the model checker tool SVE that is developed at Siemen...
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ISBN:
(纸本)3540643567
In this paper we present the multi process verification of SDL systems at the Siemens mobile phone department. the formal verification is efficiently performed by the model checker tool SVE that is developed at Siemens, too. Several case studies in the area of telecommunication protocols show that model checking techniques have reached a state where they can profitably be integrated in the industrial software development process.
the latest ITU-T standard syntax of Message Sequence Charts (MSCs) [16] offers several operators to compose MSCs in a hierarchical, iterating, and nondeterministic way. However, current tools operate on MSCs that desc...
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ISBN:
(纸本)3540643567
the latest ITU-T standard syntax of Message Sequence Charts (MSCs) [16] offers several operators to compose MSCs in a hierarchical, iterating, and nondeterministic way. However, current tools operate on MSCs that describe finite, deterministic behavior. ln this paper, we describe the architecture and the partial implementation of Mesa, an MSC-based tool that supports early phases of the software development cycle. the main functionalities of MESA are: an environment for the composition of system models through MSCs, syntactic and model-based analysis of an MSC model, and resolution of resource related underspecifications in an MSC model.
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