• 한국군사과학기술학회지
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• 제18권3호
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• pp.283-292
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• 2015

This paper presents the development of the automatic safety inspection technique for the ammunition fuzes using radiography images. The technique inspects 49-ammunition fuze by detecting the X-ray or neutron radiographic images to check whether the fuze is unintendedly armed or/and some major assembled parts are at right place. To execute the program, we loads the image(s) for under test. After reading images, the program conducts a series of pre-image processing, and then starts inspecting input images by using the detection algorithms which are designed distinctively for each fuze. After completing the detection process, the program displays the final result of the fuze status: "safety or danger." Through this program, we can cut off the fuzes which have any doubt about safety, and can only provide absolutely safe fuzes, compared with the current naked eye inspection method.

• 비파괴검사학회지
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• 제28권1호
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• pp.64-69
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• 2008

압력용기 및 구조물 용접부의 내부결함을 검출하기 위해서는 방사선투과시험과 초음파탐상시험을 시행한다. 그러나 방사선투과시험은 방사선 노출 위험성과 필름 현상처리 소요 등으로 결과의 확인에 상대적으로 긴 시간이 소요되어 제작 공정에 영향을 준다. 일반적인 수동 초음파탐상시험은 결과의 재현이 용이하지 않으며 검사자의 기량에 대한 의존도가 높다는 문제점을 가지고 있다. 이에 대한 대안으로 자동 초음파탐상시험 기법의 하나인 TOFD의 적용이 확산되고 있다. 본 연구는 결함을 포함한 시험편에 대하여 방사선투과 시험과 TOFD 기법을 적용하고 비교한 결과를 기술하였다. TOFD 기법은 초음파 시험기법의 객관적 신뢰도 향상에 기여하게 될 것으로 판단된다.

• Journal of Welding and Joining
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• 제20권2호
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• pp.65-70
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• 2002

This study was to evaluate GMA welding characteristics of the A15083-O aluminum alloy according to the shield gas mixing ratio and heat input change. The GMA welding of the base metal was carried out with flour different shield gas mixing ratios(Ar100%+He0%, Ar67%+He33%, Ar50%+He50%, and Ar33%+He67%). Regarding the if1uence on the bead shape of the shield gas mixing ratio and heat input, the bead width was greatest in Ar100%+He0% mixture. But the penetration depth and area were greatest in Ar33%+He67% mixture considering that the lower Ax gas ratio, the higher bead depth and area. Also, dilution was also best in the shield gas mixing ratio. The size and number of deflects were least in Ar33%+He67% mixture. Higher He gas ratio resulted in less deflects detected by the radiographic inspection.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2001년도 추계학술발표대회 개요집
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• pp.242-246
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• 2001

• 제어로봇시스템학회논문지
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• 제5권3호
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• pp.353-362
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• 1999

This paper presents a shape reconstruction method for automatic inspection of the solder joints on PCBs using X-ray. Shape reconstruction from X-ray radiographic image has been very important since X-ray equipment was used for improving the reliability of inspection result. For this purpose there have been lots of previous works using tomography, which reconstructs the correct shape, laminography or tomosynthesis, which are very fast algorithm. Latter two methods show outstanding performance in cross-sectional image reconstruction of lead type component, but they are also known to show some fatal limitations to some kinds of components such as BGA, because of shadow effect. Although conventional tomography does not have any shadow effect, the shape of PCB prohibits it from being applied to shape reconstruction of solder joints on PCB. This paper shows that tomography using Iterative Reconstruction Technique(IRT) can be applied to this difficult problem without any limitations. This makes conventional radiographic instrument used for shape reconstruction without shadow effect. This means that the new method makes cost down and shadow-free shape reconstruction. To verify the effectiveness of IRT, we develop three dimensional model of BGA solder ball, make projection model to obtain X-ray projection data. and perform a simulation study of shape reconstruction. To compare the performance of IRT with that of conventional laminography or tomosynthesis, reconstruction data are reorganized and error analysis between the original model are also performed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.1734-1735
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• 2011

In case of inspection on aluminum castings, traditional RT (Radiographic Testing) method have been utilized for its advantages in interpretation, cost and perpetual storage. But it has disadvantages like time consumption in film processing, low efficiency in storage and environmental pollution. In this thesis, a DRS (Digital Radiography System) utilizing X-Ray TDI Camera (Time Delay and Integration Camera) is developed. Inspections on aluminum castings are performed using the developed Digital Radiography System, DRS and reviewed if newly developed system can substitute for the traditional method.

• 한국추진공학회지
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• 제11권1호
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• pp.34-42
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• 2007

초음파를 이용한 추진기관의 비파괴검사는 X-ray 검사에 비하여 경제성이 우수하고, X-ray 검사 시 취약한 미접착, 손상 등의 결함 검출이 우수한 편이다. 그리고 전용 시설 없이 현장에서 실시간으로 검사가 가능하며 방사선 작업에 비하여 안전한 방법이다. 본 논문에서는 고체 추진제에 대한 초음파 특성을 분석하고, 추진제/라이너 미접착에 대한 내측과 외측 검사 방법 및 추진제 손상에 의한 미세 크랙 검출에 대하여 실험 및 분석하였다. 실험 결과, 추진제/라이너 미접착에 대한 내.외측 검사에 있어서 검출 가능성을 보였으며, 그리고 손상에 의한 추진제 미세 크랙도 초음파의 감쇠특성을 이용하여 검출 가능함을 보였다.

• 비파괴검사학회지
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• 제30권3호
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• pp.271-281
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• 2010

Brazing fitting which is one of the aircraft hydraulic power system components is widely used for saving weight and achieving higher reliability. Any inherent defects or damage of fitting can cause system failure and/or physical damage of human body due to highly pressurized fluid. Radiographic testing(RT) technique and additional micro-structure investigation on cut-away surfaces have been accomplished to find out some defect-like-inhomogeneity in the fittings. The radiography results showed that some defect-like-inhomogeneity existed inside body. Additional micro-structure investigation on cut-away surface reveals that the inhomogeneity is due to internal voids. In this study, it can be is said that RT technique can be a useful tool for field acceptance test of hydraulic brazing fitting in short time.

• 비파괴검사학회지
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• 제31권4호
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• pp.391-397
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• 2011

용접부에 대한 품질 확보를 위하여 방사선투과시험을 실시하고 있으나 기존의 방사선투과시험은 필름을 사용한 아날로그 방법을 적용하고 있는데 비용과 시간이 많이 소요되고 시험 공정이 복잡하여 개선이 요구되고 있다. 본 연구에서는 용접부에 대한 디지털 방사선투과영상과 아날로그 방사선투과영상의 상질을 비교한 결과, 디지털 방사선투과영상은 디지털 영상 개선 과정으로 인하여 필름 영상에 비해 보다 세밀한 관찰을 할 수 있었다. 따라서 디지털 방사선투과시험이 개선이 요구되고 있는 기존 필름에 의한 방사선투과시험을 대체할 수 있을 것으로 평가된다.

• 한방안이비인후피부과학회지
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• 제28권2호
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• pp.66-74
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• 2015

Objectives : The purpose of this study is to evaluate the effect of oriental medical treatment on a sinusitis patient Methods : We treated a 56-years old man patient with sinusitis. His symptoms are Ozena, Postnasal drip, Cough, sputum, nasal obstruction, rhinorrhea and Headache. The patient was treated with herb-med(Kami-Hyunggyeyungyotang,加味荊芥連翹湯), acupuncture, aroma oil therapy. During about a month, the patient was treated only with oriental medical treatment and without any of western medicine including antibiotics. We confirmed the progress of treatment with subjective symptoms, physical examination and radiographic inspection(PNS image). Results & Conclusions : After one month, Combined application of the oriental treatment including Kami-Hyunggyeyungyotang showed remarkable effects on subjective symptoms, physical examination and radiographic inspection(PNS image). This study show that Kami-Hyunggyeyungyotang effects on sinusitis.