comparative study of the performance of pure and hybrid group technology manufacturing systems using computer simulation techniques C. L. ANG and P. C. T. WILLEytProblems of workload imbalance in Group Technology (OT) can be mitigated by transferring workloads from a congested machine centre in one cell to an alternative, less congested machine centre in another cell. Such inter-cell workload transfer results in a GT system which is a hybrid between pure GT (in which components are completely processed within a cell) and funotional layout (FL) (in which ('()lIlJHllwnts are router! from line depurt nu-nt of si III il
The effects of sintering process conditions on the size shrinkages of low-temperature co-fired ceramic (LTCC) substrate were investigated. The process variables investigated were thickness of the stacked raw tapes, lamination pressure, lamination-pressure holding time, pre-heating time, debinding time, sintering dwell time, and sintering temperature ramp. Results revealed that the size shrinkage percentage of the LTCC samples in the lateral directions was always smaller than that in the thickness direction. The lateral shrinkage deviations were less than 2.1% for all the experiments conducted in this study. Pre-heating time, lamination-pressure holding time, debinding time, sintering dwell time and sintering temperature ramp had almost no effects on the lateral size shrinkage of the LTCC samples, and the average of the lateral shrinkage values was 15.3%, with a standard deviation of 0.17%. Lamination pressure and stacked raw-tape thickness had effects on the lateral size shrinkage of the LTCC samples, and empirical equations for calculation of the size shrinkage values were obtained by curve fitting.
To completely describe a manufacturing system, several models are usually created, each from a different viewpoint Traditionally, these models are created independently using different methodologies and in different environments. This approach poses many problems, for example, time-consuming, inconsistency between models. difficulties in model maintenance, difficulties in ensuring a seamless transition in the system development life cycle, etc .. To overcome t11ese problems, a comprehensive methodology tenned IDEF* has been developed for the modelling of enterprise systems. The purpose of this paper is to introduce to the readers the features and concepts of t11e met11odology.
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