• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.2
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• pp.173-178
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• 2007

Improvement of welding property of seat fiame is necessary for safety because seat frame is a unique connecting structural part between the rider and vehicle. Generally the robot and jig system for own use is used for welding of seat frame and unwelded zone can be inspected because of the geometrical interference between robot and jig system. In this study the unwelded zone of the conventional welding jig system is analysed and the 3D modeling and design change to solve the problem is discussed. As a result the weldability of system is improved and the manual welding jig is unnecessary because of the optimal jig system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.104-109
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• 2018

Generally, the durability of the parking lock gear is evaluated through an endurance test for the entire transmission but no test standard exists for the durability test of one part of a parking lock gear. Therefore, in this study, the durability test standards of the parking lock gear were determined autonomously, and the durability performance test was conducted. A static fracture test was carried out to determine the yield strength of the parking lock gear, and a durability test condition was set to 60 % of the yield strength. The durability test of 1,000,000 times was conducted under the given conditions using a dedicated test jig manufactured for the test. Because the jig fractured during the static fracture test, finite element analysis for the jig was carried out and the jig was re-designed. The modified jig was manufactured and the durability test was carried out based on the test standard of autonomously. The basic data on the performance and endurance limit of the parking lock gear were obtained using these tests and analyses, and the basic data will be used as fundamental materials for the design and the development of the parking lock gear.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.839-840
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• 2012

본 논문에서는 3 축 기계장비의 공간오차를 예측하기 위한 사전 단계로 각 축에 대하여 레일형상오차를 측정하였다. 전용 측정지그를 설계/제작하여 이 지그가 이동함에 따라 혼합축차이점법을 이용하여 레일형상오차를 측정하였다. 레일형상오차로부터 테이블 운동오차를 예측하고, 이와 더불어 각 축 사이의 직각도 오차를 측정한 후 이로부터 최종적으로 3 축 장비에 대한 공간오차를 평가할 예정이다. 예측된 공간오차는 실제 레이저를 이용한 공간오차 측정방법을 이용하여 검증할 예정이다.

• Review of KIISC
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• v.20 no.5
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• pp.56-64
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• 2010

AMI는 스마트 그리드 구축을 위한 핵심 기술로, 현재의 단방향 폐쇄적 에너지 공급에서 양방향 에너지 종합관리시스템 구축을 위한 기반 기술이다. 스마트 미터 및 AMI 구축을 통하여 전기요금에 대응하여 에너지를 절약하는 가전 기기 보급 및 부하 관리가 실현되고, 최대 전력의 감소를 통하여 추가적인 발전소 건설비용이 절약되게 된다. Zigbee는 AMI 통신 구현을 위한 표준 기술로 개발되고 있다. 본 논문에서는 Zigbee 기반 AMI 시스템에서 AMI 시스템의 보안 특성 및 보안 요구사항에 대한 분석 결과를 제시하고자 한다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.06a
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• pp.207-207
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.59-64
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• 2002

Recently the applications of high speed machining are increasing due to the need for high performance and high accuracy machining and machining for difficult-to-cut material. However, the high speed machining also accompanies some problems: the product quality can be degraded due to the tool wear and the product cast can go up due to frequent tool replacements. Therefore, it is necessary to develop a technique of quantitative tool wear measurement to determine the precise timing for tool replacement. In this respect, this study suggests a reliable technique far the reduction of error components by developing a system using a CCD camera and an exclusive jig to be able to precisely measure the size of tool wear in flat end mill for high speed machining.

• Korean Journal of Computational Design and Engineering
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• v.8 no.3
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• pp.189-200
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• 2003

This paper introduces the development of a three-dimensional jig design system for automotive body welding assembly. Recently, three-dimensional CAD systems have been introduced in the jig design area, because they reduce errors in design process and the design result can be used readily for virtual manufacturing simulation. However, to facilitate three-dimensional jig design, it is essential to customize three-dimensional CAD system for this specific design area. To accomplish this object, we first standardized the parts and units in a jig assembly, and then built the standard part library. We also developed the dedicated 3D design capabilities of jig units and a jig base. By using this system, design can be performed more intuitively, and verification and simulation of design results can be done more easily. The proposed system has been implemented using the UG/Open API of the Unigraphics system.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.144-144
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• 2017

쌈 채소 생산 및 유통의 효율성, 생산성 개선으로 경쟁력 향상을 위해 IoT 기반 스마트 저울과 쌈 채소전용 포장용 가이드를 개발 융합하여 안전하고 빠른 포장, 이동성 개선, 포장과 무게측정 동시 진행 및 출하량 자동측정으로 작업공정개선을 통해 최종적으로 생산성을 향상시킬 수 있는 제품을 개발하고자 한다. 1) 쌈 채소 포장용 가이드를 포함한 실시간 포장 무게 측정 장치 개발 ${\circ}$ 포장 박스와 관계없이 용이하게 사용할 수 있는 쌈 채소 포장용 가이드 개발 ${\circ}$ 실시간 포장 무게를 측정하여 출하 무게에 도달하였을 때 생산담당자에게 부저를 통해 신호전달 2) 생산패턴 분석을 통한 생산관리 애플리케이션 개발 ${\circ}$ 생산 패턴을 파악하여 실시간 생산량을 BLE 통신을 통해 관리자 스마트 폰으로 통지 ${\circ}$ 포장용 지그, 스마트 스케일, 이동체 1식으로 구성하여 용이하게 하우스 이동 3) 센서 디바이스 개발 ${\circ}$ 각종 센서(온도, 습도, 조도 등)의 디바이스를 활용하여 주위환경 데이터 수집 ${\circ}$ 스마트 폰 등을 활용한 콘텐츠 개발 및 노동복지 환경조성(작업환경 개선)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.2
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• pp.270-275
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• 2008

The straight bevel gear for automobile part has been manufactured by the cold forging instead of the gear machining tool for the mass production. The application to CAD/CAM system has been necessary in order to develop the precision product quickly by forging through the minimization of trial and error and confirm the reproducibility. In the study, the straight bevel gear with the crown teeth has been modelled by the CAD/CAM system. The master gear after the gearing test has been machined after the modelling, NC data generation and verification. The die for forging and the jig for machining has been manufactured using the master gear.

• The Journal of Korean Academy of Prosthodontics
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• v.55 no.3
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• pp.264-271
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• 2017

Purpose: The purpose of this study is to investigate the differences in bond strength of four different indirect composites to the gold alloy and Ni-Cr alloy according to type of metal surface treatment after water storage. Materials and methods: Type IV gold alloy and Ni-Cr alloy were used for casting alloy while four types of indirect composite resins (Gradia, Tescera Sinfony and in;joy) were used in this study. Metal specimens were produced by casting and total of 240 specimens (60 specimens per one indirect composite group) were prepared. After bonding indirect composite resin and undergoing 24 hours of polymerization, customized jig was attached to the metal specimen and shear bond strength were measured using universal testing machine. Also, differences in shear bond strength before and after water storage for 240 hours were also measured. Results: In the measurement of shear bond strength according to the metal surface treatments, bead group showed high strength followed by loop and flatting group (P<.05). After being stored in water bath for 240 hours, Gradia showed statistically significant high bond strength compared to other indirect composite resins in all groups (P<.05). Conclusion: Shearbond strength was found to be different according to type of metal surface treatment and type of metal used after storage in water. Further studies need to be developed for clinical practices as three are still problems of microleakage, stain or wear.