• 제목, 요약, 키워드: Defect

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TFT-LCD영상에서 결함 가능성에 따른 순차적 결함영역 분할 (Sequential Defect Region Segmentation according to Defect Possibility in TFT-LCD Image)

  • 장충환;이승민;박길흠
    • 한국멀티미디어학회논문지
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    • v.23 no.5
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    • pp.633-640
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    • 2020
  • Defect region segmentation of TFT-LCD images is performed by combining defect pixels detected by a defect detection method into defect region, or by using morphological operations to segment defect region. Therefore, the result of segmentation of the defect region is highly dependent on the defect detection result. In this paper, we propose a method which segments defect regions sequentially according to the possibility of being included in defect regions in TFT-LCD images. The proposed method repeats the process of detecting a seed using the median value and the median absolute deviation of the image, and segments the defect region using the seeded region growing method. We confirmed the superiority of the proposed method to segment defect regions using pseudo-images and real TFT-LCD images.

공동주택 하자감정을 위한 하자조사단계의 현장조사 업무 모델링 (Field Investigation Work Modeling on Defect Inspecting Step of Defect Consulting in Apartment Building of Korea)

  • 박준모;서덕석
    • 한국건축시공학회:학술대회논문집
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    • pp.87-88
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    • 2015
  • A defect dispute surrounding an apartment building is in constant trouble, a defect consulting is necessary that objective and impartial for solving a defect. The defect dispute about a defect lawsuit is conducted in the order that filling of lawsuit, consulting order, defect inspecting, estimating a repairing cost, writing a consulting report, submitting a consulting report, and decision by court. Of these, a step of defect inspecting is extensively investigated an occurred defect that each defect index and type from each part and place. At this time, it is collected of many data and created many information. For this, it need to organize and manage. The study is a modeling of field investigation work process that second phase of defect inspecting step. A literature study is defined a work until level 2. This study is defined the work until level 3 to 4. In addition, the modeling can do for using a job name, a place to job, a job to do, and a person concerned about defect consulting case. The modeling is expected a contribution of improving a defect consulting process and systematizing a judgment standard.

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원소재의 미소 표면결함이 인발공정에 미치는 영향 (Effect of Small Surface Defects in the Starting Material on Product Quality after Drawing)

  • 남찬희;이익균;이중규;전만수
    • 소성가공
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    • v.23 no.3
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    • pp.159-163
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    • 2014
  • In the current study, the effect of small surface defects in the starting material including roughness, indentations, or scratches, which are perpendicular to the direction of drawing, on the product quality is investigated using the finite element method. An axisymmetric defect is assumed. Such defects are defined by a cylindrical defect area and two tapered regions connecting the defect area to the non-defective area of the material. Various conditions for these initial surface defects are considered, including defect depth, defect slope and defect length. To describe the plastic deformation of the defect in detail during the simulation, local remeshing is applied. Based on the finite element results, defect disappearance maps were generated. It was found that defect disappearance is significantly dependent on the defect depth and the defect length coupled with the defect slope.

BPMN 모델링 방식을 활용한 공동주택 하자진단 업무프로세스 모델 (The Defect Diagnosis Process Model Utilizing BPMN Modeling Method in the Apartment Housing)

  • 정려원;김경환;이정석;김재준
    • 한국주거학회논문집
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    • v.26 no.2
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    • pp.67-79
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    • 2015
  • As the Korean construction market in the apartment housing has changed to a housing consumer focused market, interest and importance on efficient use and management on existing buildings has increased rather than demand for new buildings. Interest of housing consumers on apartment house quality has increased in this market paradigm, and this spontaneously is connected to quality flaw related defect disputes and lawsuits that the importance of defect diagnosis has continuously increased. This defect diagnosis is directly connected to maintenance charges in defect dispute and lawsuit processes that rather objective and highly credible progress of duty is required. However, most defect diagnosis firms today that progress defect diagnosis are using different diagnosis methods and depend on the experience of experienced professionals that there is no standardized defect diagnosis process. Therefore, the purpose of this study is to provide common defect diagnosis process model for defect diagnosis firms utilizing the BPMN (Business Process Modeling Notation) modeling method. It is expected that this will contribute to professional and reliable task performances of concerned defect diagnosis workers. Furthermore, it is expected that design lawsuit damage will be substantially reduced by standardizing defect diagnosis processes.

4~10년차 실적자료에 근거한 공동주택 하자보수 보증금의 사용실태 분석연구 (Analytic study of 4~10 years Defect Deposite Use State based on Actual Data after moving in apartment complex)

  • 서덕석;전명수;이은희
    • 한국건축시공학회:학술대회논문집
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    • pp.153-154
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    • 2011
  • In Korea, the apartment supplier should satisfy the apartment residents' demand on the defect repair found in apartment housing by the law of Management of Apartment Complexs. But in the cost of defect repair, not only the actual defect repair cost, but also the cost of residents' complains are contained. So in this analytic study, the actual use state of defect deposite during 4~10 years after moving in are analysed base on actual data of 15 apartment complexes. In this study, about 66% of defect repair deposites are used to actual defect repair and only 34% of defect repair cost are spent to satisfy the demand of apartment residents'.

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A Study on Proper Location of Welding Defect in Three Point Bend Testing with MDPE Pipe

  • Lai, Huan Sheng;Yoon, Kee Bong;Kil, Seong Hee
    • 에너지공학
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    • v.24 no.1
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    • pp.1-9
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    • 2015
  • Welding defects affect the performance of welded pipe joints. In this study, a three point bend test of welded steel and medium density polyethylene (MDPE) pipe joints with defects of various defect locations and defect materials was studied using the finite element method. The defect was assumed to be located at 12 o'clock, 3 o'clock or 6 o'clock direction. The results showed that pipes failed more easily on the compression side due to stress or local buckling. The air defect was more dangerous than the steel defect if the defect was located in the compression side; otherwise, the defect material effect on the integrity of pipes was ignorable. It is argued that the integrity of pipes with defects in the compression side is weaker than that in other regions, and the defect should be located in the compression side or the 12 o'clock position in the three point bend test to maximize the effect of defect existence on the pipe structural integrity.

순차적 결함 검출 방법에 기반한 TFT-LCD 결함 영역 검출 (TFT-LCD Defect Blob Detection based on Sequential Defect Detection Method)

  • 이은영;박길흠
    • 한국산업정보학회논문지
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    • v.20 no.2
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    • pp.73-83
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    • 2015
  • 본 논문에서는 순차적 결함 검출 방법을 이용하여 TFT-LCD의 결함 영역(Blob)을 효과적으로 검출하는 알고리즘을 제안한다. 먼저 결함과 배경 간의 휘도 차를 이용하여 영상의 각 화소들에 대한 결함 확률을 판단하고, 결함 확률에 따른 순차적 결함 검출 방법을 이용하여 결함 후보 화소를 검출한다. 여기서 결함 확률이란 결함 후보 화소가 검출된 단계에 따라 결함 영역에 포함될 가능성을 나타내다. 형태학 연산을 적용함으로써 검출된 후보 화소들을 후보 결함 영역으로 형성하고, 각 후보 결함 영역에 대한 결함 가능성을 계산하여 결함 영역을 검출한다. 모의 TFT-LCD 영상을 생성하여 제안 방법의 타당성을 검증하고, 실제 TFT-LCD 영상에 적용함으로서 제안 알고리즘의 우수한 결함 검출 성능을 확인하였다.

공동주택 하자감정서의 구성체계 분석 (Analysis on the Structure of Defect Consulting Report in Apartment Building)

  • 박준모;서덕석;김옥규;박길범
    • 한국건축시공학회:학술대회논문집
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    • pp.166-167
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    • 2013
  • There has been a defect dispute of apartment building in Korea. The defect dispute is complicated by main issues and details of dispute. It is yet to be solved. Meanwhile, a judge does not a inspection and analysis, but, related field expert who contracted professional engineer does. As a result, defect consulting report that an important judgment is used in a defect dispute. Therefore, this study does research on structure of defect consulting report. A defect consulting report has same items, irrespective of a defect consultant as a result that check 7 indexes about 10 cases. It has different structure's details depending on each defect consultants. And, it inserts new detail or deletes existing detail, does not show clear distinction.

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공동주택 하자소송에서의 조경하자유형 사례분석 (Case Study on Landscape Defect Type of Defect Lawsuit in Apartment Building)

  • 박준모;서덕석
    • 한국건축시공학회:학술대회논문집
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    • pp.263-264
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    • 2016
  • Since 2000s in Korea, apartment building tended to become goods or assets rather than houses. Therefore, conflicts between supplier and consumer were aggravated, and the defect dispute has been increased rapidly. This dispute enlarges to defect lawsuit and it is social and economical matter. The landscape work in apartment building is main work for a resident that appearance and convenient facility which lawn, tree, fountain, chair, playground, and etc. A number of defects surround landscape work are important issue in defect lawsuit, but, a related research is a minority, and a regulation is incomplete. Therefore, this study is basic study for standard of landscape defect type. As case study on defect lawsuit, draw a landscape defect type in apartment building.

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Defect Severity-based Defect Prediction Model using CL

  • Lee, Na-Young;Kwon, Ki-Tae
    • 한국컴퓨터정보학회논문지
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    • v.23 no.9
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    • pp.81-86
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    • 2018
  • Software defect severity is very important in projects with limited historical data or new projects. But general software defect prediction is very difficult to collect the label information of the training set and cross-project defect prediction must have a lot of data. In this paper, an unclassified data set with defect severity is clustered according to the distribution ratio. And defect severity-based prediction model is proposed by way of labeling. Proposed model is applied CLAMI in JM1, PC4 with the least ambiguity of defect severity-based NASA dataset. And it is evaluated the value of ACC compared to original data. In this study experiment result, proposed model is improved JM1 0.15 (15%), PC4 0.12(12%) than existing defect severity-based prediction models.