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양우열(WooYul Yang),이승열(Seung Yeol Lee),금영탁(YoungTag keum),황진영(JinYoung Hwang),윤치상(ChiSang Yoon),신철수(ChirlSoo Shin),조원석(WonSuk Cho) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In order to develope springback reduction technology for high-strength steel sheets, 3 studies have been conducted: dome stretching tests, stepped s-rail forming and springback measurement, and optimally shaped initial blank design. First, to find out the formability of TRIP60, dome stretching test was performed. Next, the stepped s-rail die, which was designed to form a channel type panel with large twist and wall curl, was manufactured and used to know the effect of controlling forming variables, such as blank holding force and flange amount on the springback. Furthermore, new measurement technology of the springback was introduced to define wall curl and twist in geometrically complex panels. Finally, the optimally shaped initial blank was employed to verify one of the best ways to reduce the springback in chanel type, high strength sheet panels.
서상원 ( Seo Sangwon ),허화만 ( Heo Hwaman ),장봉기 ( Jang Bongki ),황우열 ( Hwang Wooyull ),정일호 ( Jung Ilho ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.3
Purpose: Although the price reduction policy is established for military supplies, it is more focused on general military items. Therefore, it is hard to apply the current price reduction policy directly to the major weapon system. The purpose of this study is to develop an evaluation model which generates appropriate outputs for price reduction of military supplies. Methods: To improve the current policy, we first analyze the relevant policies of price reduction of similar organizations. We gather the opinions of related organization through survey including DAPA, Logistics Command, DTaQ and Defense industry companies. Then, we develop a price reduction model based on the analytic hierarchical process(AHP) method to find out important factors for price reduction. Results: The results of AHP analysis show that the important factors when applying price reduction of military supplies. From the analysis, the proposed method effectively generates the amounts of price reduction for the nonconformance items. Conclusion: The results of this research will be used as guidelines to improve military supplies policy of price reduction.