• Computers and Concrete
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• 제20권4호
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• pp.409-418
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• 2017

Turkey owns a very important cultural and historical heritage that bears the traces of thousands of years of culture and civilization. It is an inevitable duty to carry these treasuries to the future generations. In this paper, structural safety assessment and strengthening stages of one of these important historical heritages namely Amasya Taşhan was investigated in details as a case study. For this purpose, the detailed architectural projects of the structure with the information of all load carrying and structural elements were prepared. Then, the structural dynamic analyses were performed by using SAP2000. The internal forces obtained from the dynamic analyses determined the weak regions. By obtaining the information from dynamic analyses, the method of state of the art technique of application of the structure that needs structural strengthening was selected. The last step is the application of these precautions to the whole structure. At the end of this study, this study not also contains several strengthening techniques that is used in one masonry structure together but also provides a useful reference to the practicing engineers.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2003년도 추계학술발표회초록집
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• pp.118-118
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• 2003

In a rolling wire probe, a key component of an inspection apparatus for PDP electrode patterns, the electric performance of it is known to be strongly dependent on the surface condition of a collet pin, a needle pin, and a wire. However, the collet and needle pins rotate very rapidly in contact with each other, which results in the degradation of the surface by the heat and friction and finally the formation of black wear marks on the surface after a several hundred hours test. Once the black wear marks appear on the surface, the electric resistance of the probe increases sharply and so the integrity of the probe is severely damaged. In this experiment, TiN coating, which has excellent electric conductances and good wear-resistance, has been applied on the surface of collect and needle pins for preventing the surface damages. In order to achieve the homogeneous coating with a good adhesion property, special coating substrate stages and jigs were designed and applied during coating. TiN has been deposited using 99.999% Titanium target by a DC reactive sputtering method. According to the components and jigs, processing parameters, such as DC power, RF bias and the flow rate ratio of Ar and N$_2$ used as reactive gases, has been controlled to obtain good TiN films. Detailed problems and solutions for applying the new substrate stages and jigs will be discussed.

• 한국산학기술학회논문지
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• 제10권7호
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• pp.1725-1728
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• 2009

본 연구개발에서는 정해진 환경에서 최대의 불량검출 능력을 발휘할 수 있도록 공정을 개선하기 위하여 전게이트 시각검사에 필수적인 FGV 패턴발생 장치와 공정제어 장치를 개발하였다. 본 연구개발을 통하여 접촉손실(Tact Loss)을 0에 근접 한 수준으로 유지할 뿐만 아니라 손실 및 에러 발생시 신속한 대처가 가능하여 모듈의 수율을 향상시킬 수 있을 것으로 기대된다. 또한 세부 동작 시퀀스를 제어하기 위한 H/W와 S/W 시스템을 생산라인에 실장하고 성능점검 및 인증을 수행한 결과 Tact에 의한 Pixel 불량의 경우는 98.1%, Line 불량의 경우는 99.1%의 검출율을 나타내었으며, Gate 및 Visual 레벨 테스트를 포함한 모듈공정 전체의 수율이 98.3%까지 증가하였다.

• 품질경영학회지
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• 제47권3호
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• pp.417-424
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• 2019

Purpose: In this study, the goal is to analyze this case to prevent the same accidents when using one-shot rifle. Methods: Detailed analysis of damaged parts must first be made in order to determine the cause of the abnormal explosion. The cause of abnormal operation can be determined by analyzing the information of damaged components and the firing mechanism of the weapon step by step. Also we can refer to a statement of shooter, witness and accident scene situation. Based on this theory, cause of abnormal firing can be narrow down. Results: Fracture of pin for fixing firing and latch is cause of abnormal operation of firing. Conclusion: It is deemed that periodic inspection and fundamental improvement of the structure are required to prevent the same accident as this.

• Earthquakes and Structures
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• 제10권3호
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• pp.645-667
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• 2016

The 750 m long "De Bosset" bridge in the Cephalonia Island of Western Greece, being the area with the highest seismicity in Europe, was constructed in 1830 by successive stone arches and stiff block-type piers. The bridge suffered extensive damages during past earthquakes, such as the strong M7.2 earthquake of 1953, followed by poorly-designed reconstruction schemes with reinforced concrete. In 2005, a multidisciplinary project for the seismic assessment and restoration of the "De Bosset" bridge was undertaken under the auspices of the Greek Ministry of Culture. The proposed retrofitting scheme combining soil improvement, structural strengthening and reconstruction of the deteriorated masonry sections was recently applied on site. Design of the rehabilitation measures and assessment of the pre- and post-interventions seismic response of the bridge were based on detailed in-situ and laboratory tests, providing foundation soil and structural material properties. In-situ inspection of the rehabilitated bridge following the strong M6.1 and M6.0 Cephalonia earthquakes of January 26th and February 3rd 2014, respectively, revealed no damages or visible defects. The efficiency of the bridge retrofitting is also proved by a preliminary performance analysis of the bridge under the recorded ground motion induced by the above earthquakes.

• 천문학회보
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• 제43권2호
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• pp.32.1-32.1
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• 2018

The galactic warp is almost ubiquitous among disk galaxies and suspected to be an imprint of recent interactions with other galaxies. The detailed evolutionary course, however, is still uncertain due to the lack of observational evidence. To address this issue, we construct a new extensive catalog of 412 conspicuously warped disks at z = 0.01 ~ 0.05, based on SDSS DR7. We classify the warp morphology through a visual inspection from the Zooniverse Project and our new automated scheme for the warp measurement. We find an interesting color difference between S-and U-shaped warps. The U-type warp galaxies exhibits considerable color offset towards blue compared to both the S-type warps and the control sample of un-warped galaxies. The effect is even more pronounced for galaxies (a) with the greater warp amplitude and (b) with lower luminosity. This is the first piece of observational evidence that the S- and U-shaped warps are on different evolutionary phases in terms of not only dynamics but stellar populations as well. We discuss the implications in the context of the warp evolution theory.

• Plant Breeding and Biotechnology
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• 제5권4호
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• pp.269-281
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• 2017

With the continual development of genetically modified (GM) crops, it has become necessary to develop detailed and effective molecular characterization methods to select candidate events from a large pool of transformation events. Relative to traditional molecular analysis methods such as the polymerase chain reaction (PCR) and Southern blot hybridization, next generation sequencing (NGS) technology for whole-genome sequencing of complex crop genomes had proven comparatively useful for in-depth molecular characterization. In this study, four transformation events, including one in Bacillus thuringiensis (Bt)-resistant rice, one in resveratrol-producing rice, and two in beta-carotene-enhanced soybeans, were selected for molecular characterization. To merge NGS analysis and Southern blot-hybridization results, we confirmed the transgene insertion sites, insertion construction, and insertion numbers of these four transformation events. In addition, the read-coverage depth assessed by NGS analysis for inserted genes might provide consistent results in terms of inserted T-DNA numbers in case of complex insertion structures and highly duplicated donor genomes; however, PCR-based methods can produce incorrect conclusions. Our combined method provides an effective and complete analytical approach for whole-genome visual inspection of transformation events that require biosafety assessment.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.4043-4064
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• 2021

Night-time image quality evaluation is an urgent requirement in visual inspection. The lighting environment of night-time results in low brightness, low contrast, loss of detailed information, and colour dissonance of image, which remains a daunting task of delicately evaluating the image quality at night. A new blind quality assessment metric is presented for realistic night-time scenario through a comprehensive consideration of contrast, texture, and colour in this article. To be specific, image blocks' color-gray-difference (CGD) histogram that represents contrast features is computed at first. Next, texture features that are measured by the mean subtracted contrast normalized (MSCN)-weighted local binary pattern (LBP) histogram are calculated. Then statistical features in Lαβ colour space are detected. Finally, the quality prediction model is conducted by the support vector regression (SVR) based on extracted contrast, texture, and colour features. Experiments conducted on NNID, CCRIQ, LIVE-CH, and CID2013 databases indicate that the proposed metric is superior to the compared BIQA metrics.

• 한국산림과학회지
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• 제102권1호
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• pp.90-96
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• 2013

이 연구는 '콘크리트 테스트 해머'를 이용하여 1990년대에 경기도와 강원도에서 시공된 사방댐 중 사방협회 에서 육안 점검한 사방댐 10기(양호 6기, 불량 4기)의 대수면, 방수로 및 반수면의 반발경도 측정을 통해 사방댐의 안정성을 파악하여 사방댐의 비파괴검사에 적합한 압축강도 추정식과 적정 판정범위를 정하는 것을 목적으로 진행하였다. 특히, 콘크리트 사방댐 본체의 안정성을 사전에 파악하게 되면 사방댐을 적시에 보수, 관리할 수 있고, 사방댐 본연의 기능인 토사유출방지기능을 최대화할 수 있다. 콘크리트 사방댐의 압축강도 조사한 결과, 현재 사방협회에서 진행 중인 안정점검 육안 점검 결과와 대부분 일치하였다. 또한, 안정점검시 압축강도는 일본건축학회에서 제시한 추정식을 적용하는 것이 적합할 것으로 판단되었으며, 판정 기준은 300 $kgf/cm^2$ 이상일 경우에는 '안정', 250~300 $kgf/cm^2$이 범위일 경우에는 '정밀검사 필요', $kgf/cm^2$ 미만일 경우에는 '불량' 판정을 내리는 것이 적합하다고 사료된다. 그리고 사방댐의 연대별 압축강도에 대한 자료를 충분히 축적하고, 이를 토대로 우리나라 사방댐에 적합한 안정기준과 압축강도 추정식이 필요하다고 사료된다. 앞으로는 육안 점검과 간이 안정성 검사를 통해 사방 구조물에 이상이 발견될 경우 정밀진단 검사를 실시하여 안정도를 파악하는 체계가 구축되어야 할 것이다.

• 한국구조물진단유지관리공학회 논문집
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• 제19권2호
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• pp.133-142
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• 2015

공공건축물의 예산은 앞으로 유지관리에 더 많이 투입될 것으로 예상되며 체계적인 유지관리와 충분한 예산확보가 중요하게 인식되고 있다. 국내 건축물 유지관리는 인력 부족과 전문성 결여, 유지관리 예산산정의 근거부족으로 인하여 체계적인 유지관리가 이루어지지 않고 있다. 호주에서는 자산관리를 통해 시설물의 유지관리를 최적화하고 있으나, 국내의 경우 규제중심의 수동적인 형태를 벗어나지 못하고 있는 실정이다. 국내 유지관리의 선진화를 위해서 체계적인 자산관리의 도입이 필요하다. 이 연구에서는 국내 외 사회기반시설물에 적용한 자산관리 프로세스를 분석하고, 공공건축물의 자산관리 프레임워크를 제시하였다. 자산관리 절차는 일상적인 자산관리 절차에 선택적으로 자산 가치를 평가 하도록 구성되어 있다. 본 연구에서 제시한 프레임워크는 공공건축물의 자산관리 업무수행에 초점을 맞추어 개발하였으며, 단계별 세부적인 내용을 제시하였다. 이 프레임워크를 실무에 적용한다면 건축물의 가치와 성능을 체계적으로 관리할 수 있으며, 유지관리 예산을 효과적으로 책정할 수 있을 것으로 기대된다.