Abstract: The present invention relates to the creating of an aircrew flight scheduling pattern as a time series pattern, and aims at facilitating the effective crew flight scheduling pattern creation by applying a genetic algorithm. A plurality of flight strings are created based on link relations among flights regarded as elements for one day which is defined as a first time span. A genetic algorithm is executed for each flight string, and daily crew flight scheduling patterns are created based on the most suitable evaluation value flight strings. For one month which is defined as a second time span, a monthly crew flight scheduling pattern is created based on the most suitable evaluation value daily pattern strings in the same way by regarding the daily crew flight patterns for 30 days as elements.

Abstract: A method for amending a defective mask pattern of a photomask. A pattern component of a normal mask pattern having the same pattern layout as that of the defective mask pattern to be amended is irradiated by a spotlight. The shape of the spotlight is aligned with the shape of the pattern component which is the same pattern as the component of the defective mask pattern to be amended. At least one base mark is aligned with at least another pattern component near the irradiated portion. Then, the position of the base mark relative to the position of the irradiated portion is fixed. After that, the normal mask pattern is replaced by the defective mask pattern. The base mark is aligned with a pattern component near the defective pattern component in the same manner as the alignment of the normal mask pattern. After that, the spotlight irradiates the defective mask pattern, the luminous intensity of said spotlight being intensified so that it can amend the defective pattern component.