การพัฒนาระบบสารสนเทศเพื่อการประเมินต้นทุนการผลิตชิ้นงานพลาสติกภายในรถยนต์ / พันธ์นิดา เริงฤทธิ์ = Development of information system for production cost estimation of decorative plastic auto parts / Pannida Rerngrit
Estimating production cost of decorative plastic auto parts could be significant to price determining before proposing to customer and usually performed using intuitive method. Tolerated cost estimation and delay problems could be resulted. The objective of this study was to develop information system and database for production cost estimation. Product and cost structures of auto part were studied data based and computing program were performed using Visual Studio .NET and Microsoft SQL Server 2005 program. The production cost estimated by existed and improving methods were compared. The study had developed the program for production cost calculation consisting (1) input data classifying to cost structure such as, direct material, direct labor, factory overhead, packing, tooling and transportation. (2) Database systems which were raw material, labor, production data, factory overhead, Tooling and production cost report. The production cost estimated using the new method gave higher than the existing one because (1) the direct material cost had taken into account of the loss and reject rate for each process between injection and dipping process. (2) direct labor cost had considered the wage followed by the skill levels of workers, whereas the existing method using the average and including of factory overhead cost.
