Along This paper deals with research on firearm barrel processing and aims to improve firearm performance, accuracy, and machinability. The barrel is one of the key parts of a firearm and has a direct impact on shaping the trajectory of ammunition. In particular, durability and reliability are required due to the enormous heat generated as the bullet passes through. In this study, experiments were conducted under the processing conditions used in barrel processing to identify and analyze the characteristics. Various technologies and methods were investigated and analyzed. To achieve this, the cutting force generated during conventional barrel processing was measured to determine the level of stress on the material. In addition, we determined the suitability of tools and cutting conditions used in metal processing to identify conditions that can maximize productivity. This paper is expected to contribute to improving firearm performance by suggesting a plan to optimize processing conditions to the firearms manufacturing industry. Additionally, it can be used as a reference for barrel processing by other researchers.

In military, empty cartridge recovery case of personal small arms is a device used to collect the empty cartridge after consumption of bullets. It has different shapes depending on the shape of small arms. However, It should be designed in a shape that wraps around the outlet for empty cartridge and it should be no restrictions to the movement of small arms. It has been used to spread military. but military is demanding design improvement due to frequent damage of empty cartridge recovery case. In this report, We improved the shape of the product in order to prevent damage to the product and verified through the FEM analysis and prototype test. According to the result of simulation, best modified modelling of this study has been reduced about 19% of the stress compared to initial modelling. In addition, modified products were confirmed durability, wearability and fixability through fire test.

목적: 본 연구의 목적은 사격 소총 선수 1명을 대상으로 긍정심리기법을 활용한 심리기술훈련이 심리변화와 경기력에 미치는 효과를 분석하는 것이다. 방법: 연구목적을 달성하기 위해 단일피험자 사례설계를 활용하였으며, 긍정심리자본, 스포츠수행전략, 심박변이도, 경기결과 분석, 심층면담을 통해 심리기술훈련의 효과를 확인하였다. 심리기술훈련 프로그램은 긍정심리기법, 목표설정, 루틴개발, 심상훈련, 이완훈련, 주의집중을 주제로 총 40주간 사전단계, 훈련단계, 사후단계로 구분하여 적용하였다. 결과: 긍정심리기법을 활용한 심리기술훈련 적용 결과 긍정 심리자본, 스포츠수행전략, 심박변이도는 물론 경기력이 긍정적으로 변화되었다. 결론: 연구대상자에게 적용된 긍정심리기법은 긍정적인 정서유발을 통해 부정적 정서와 사고를 효과적으로 대처하여 주 호소문제가 해결되었다고 사료된다. 현재 국내 선수경기력 향상을 위한 심리기술훈련 기법은 비교적 한정적인 관계로 다수의 종목 및 포지션에 따른 세심한 심리기술 적용이 제한되어 있다. 이에 후속연구에서는 긍정심리기법을 적용한 다양한 연구들이 시도되어야 한다.