• Title, Summary, Keyword: Defect

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A directional defect detection in texture image using mathematical morphology (수리 형태론을 이용한 texture 영상의 방향성 결함검출)

  • 김한균;윤정민;오주환;최태영
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.4
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    • pp.141-147
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    • 1996
  • In this paper an improved morphological algorithm for directional defect detection is proposed, where the defect is parallel to the texture image. The algorithm is based on obtaining the background image while removing the defect by comparing every directional morphological result with max or min except that of defect. The defect can of defect and the background image. For a computer simulation, it is shown that the proposed method has better performance than the conventional algorithm.

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Case Study for Developing of Standard Process about Defect Consulting Work in Apartment Building (공동주택 하자감정업무 표준절차개발을 위한 사례분석)

  • Park, Jun-Mo;Seo, Deok-Seok
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.158-159
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    • 2014
  • There is urgent for defect consulting work to standardize the investigated method, repaired and reinforced method, and estimated cost about defect in increasing a defect lawsuit of apartment building. For the purpose of developing the standard process of defect consulting work, the review that a used process in law and institution should take precedence. There is not prepared the national standard for defect consulting but is dependent on an experience and a practice of consultants. This study analyzes defect consulting case, defines main steps for developing the standard process, and draws phased work factors. As systemizing this, it is expected to apply to basic structure for developing the standard process of defect consulting work for the next.

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Cast Defect Quantify on the Simulation for Large Steel Ingots and Its Application (대형잉곳 전산모사 결함 정량화 및 활용연구)

  • NamKung, J.;Kim, Y.C.;Kim, M.C.;Yoon, J.M.;Chae, Y.W.;Lee, D.H.;Oho, S.H.;Kim, N.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.94-97
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    • 2009
  • Cast defect in large steel ingots are estimated in quality and compared each other cast conditions on simulation results by now. The cast defects, micro-crack, shrinkage, pin hole which are predictable in simulation with a reasonable accuracy. In this study, 15 ton steel ingot casting was simulated for solidification model and cast defect prediction. And the real cast was carried out in a foundry for the compeer to the simulation results, the cast defect prediction. Also, the quantity of predicted defect was tried to measuring with the defect mach counting for the various simulated cast conditions. The defect quantity work was used to find the optimized cast condition in DOE(design of experiment) procedure.

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Design of Software Opportunity Tree and Its Algorithm Design to Defect Management (소프트웨어 결함 처리를 위한 Opportunity Tree 및 알고리즘 설계)

  • Lee, Eun-Ser;Lee, Kyung-Whan
    • The KIPS Transactions:PartD
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    • v.11D no.4
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    • pp.873-884
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    • 2004
  • This research provides the solution of defect problem and detection of defect and its causes that happen on software development. For developing a reliable software, a key factor is to find and manage defects that are during software development. Based on defect items analysis, we understand associated relation between defects and design defect opportunity tree. Developing the similar project, we can estimate defect and prepare to solve defect by using defect management opportunity tree.

Analysis of Defect Repair Cost by Work Type based on Defect Inspection of Apartments (공동주택의 하자진단에 기초한 공종별 하자보수비용의 분석)

  • Lee, Jin-Eung;Kim, Byung-Yun;Jeong, Byung-Joo
    • Journal of the Korea Institute of Building Construction
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    • v.15 no.5
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    • pp.491-500
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    • 2015
  • This study investigated defect status by work type, based on the report data of defect inspection results, acquired by consumers' request to safety inspection agencies, before the expiration of legal defect repair warranty period. In fact, the data was not acquired by centering on suppliers, namely, construction companies in relation with the defects becoming causes to increase construction cost of apartments. This study aims to provide objective and basic data for quality improvement at construction stage and for solution to defect disputes. The study results are presented below: (1) The number of defect cases occurring from architectural work among total work types were 1,986, defect occurrence rate was 62.5%, and defect repair cost was KRW $25,851/m^2$, which stood at 78.2% of the total work types. This means the defect occurrence rate and defect repair cost in architectural work are bigger than those of other work types. (2) Major defects in architectural work were revealed in the following order: cracks from frame work, inferior interior finishing work, inferior finishing work of plaster/masonry works, water leak/damage from waterproof work and withering/omission from landscape work. The total repair cost of the major selected defects was KRW $12,220/m^2$, and was analyzed to take up 37% of the total defect repair cost.

Assessment of Defect Risks in Apartment Projects based on the Defect Classification Framework (공동주택 하자분류체계 기반 하자위험 평가)

  • Jang, Ho-Myun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.3
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    • pp.61-68
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    • 2018
  • In general, defects cause a lot of maintenance costs and serious damage to various stakeholders, such as the owners, contractors or occupants of apartments. For this reason, a systematic and efficient defect management method is needed to minimize defect disputes. This paper derives a defect classification framework and proposes a defect risk assessment model for different types of defects. For this purpose, 6,000 defect items are allocated to the defect classification framework; these items are associated with 34 apartment projects over ten years old. As a result of this analysis, it was confirmed that the defect risks are concentrated in the areas of RC and finishing work. Based on these results, it is necessary to prevent the major risks of defects according to their priority. Based on this research, it is judged that further research to develop a method of managing the risks of defects may be necessary.

Effect of rhBMP-2 on the healing of bone defect in the low calcium diet rat (rhBMP-2가 저칼슘식이 투여 백서의 골결손부 치유에 미치는 영향)

  • Choi Yong-Suk;Hwang Eui-Hwan;Lee Sang-Rae
    • Imaging Science in Dentistry
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    • v.34 no.1
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    • pp.35-48
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    • 2004
  • Purpose: To investigate the effect of rhBMP-2 on the healing of bone defect in the low calcium diet rat. Materials and Methods: To prepare the experimental model, control group was fed a normal diet and experimental group was fed a low calcium diet for 3 weeks. And then, 4 mm bicortical perforated bone defect was made on mandibular body of each rats. Experimental group was subdivided into two groups; experimental group 1 (rats given a low calcium diet before and after bone defect) and experimental group 2 (rats given a low calcium diet before and after bone defect with rhBMP-2 application). At 1, 3, 5 and 7 weeks after bone defect formation, the rats were terminated. The healing of bone defect was assessed by three-dimensional computerized tomography, soft x-ray radiography, and histopathological examination. Results : The wound healing of the bone defect for control group, experimental group 1, and experimental group 2 showed a increase from 3 weeks after bone defect formation. The experimental group 2 showed a more increase in healing amount than control group and experimental group 1 from 5 weeks after bone defect formation and the experimental group 2 showed a complete recovery of bone defect at 7 weeks after bone defect formation. Conclusion: The healing process of bone defect is accelerated by rhBMP-2 application in the low calcium diet rats.

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Long-term radiographic evaluation of infrabony defect treated by flap operation (치주판막술에 의해 치료된 골연하 결손부의 장기적 방사선학적 변화 양사의 관찰)

  • Bae, Sang-Ryul;Park, Jin-Woo;Suh, Jo-Young;Lee, Jae-Mok
    • Journal of Periodontal and Implant Science
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    • v.38 no.3
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    • pp.429-436
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    • 2008
  • Purpose: The goal of periodontal regenerative therapy is to replace bone, cementum, and periodontal ligament on a previously diseased root surface, which has suffered the loss of these supporting structures. To accomplish the regeneration, a number of surgical procedures have been advocated throughout the years. There seems to be a potential for some spontaneous periodontal tissue regeneration in the bottom of periodontal defect following open flap debridement alone. The aim of this study was to analyse the radiographic bone changes over 2-year after flap operation. Material and Methods: Patients attending the department of periodontics of Kyungpook National University Hospital were studied. Patients had clinical and radiographic evidence of infrabony defect(s). forty two sites of 33 patients aged 26 to 65 (mean age 45.5) were treated by flap operation with or without osseous surgery. Baseline and over 2-year follow-up radiographs were collected and evaluated for this study. Radiographic assessment includes a bone fill, bone crest change, defect resolution, and % of defect resolution. Pre- and post-treatment differences between variables (maxilla and mandible, gender, defect depth, defect angle) using the paired t-test were examined. Result: We observed 0.74 mm of bone fill, 0.66 mm of crestal resorption, 1.40 mm of defect resolution, and 27% of percentage of defect resolution. Mandible, women, deeper initial defect depth, narrower initial defect angle showed greater bone fill, defect resolution, and % of defect resolution. Conclusion: The results of this study suggest that the use of flap operation did enhance the outcome in terms of radiographically detectable bone fill. Both treatment resulted in some loss of crestal bone height.

Aortopulmonary septal defect with anomalous origin of the RPA from aorta and PDA (개방성 동맥관과 우폐동맥 이상기시를 동반한 대동맥 폐동맥 중격결손증 1례 보)

  • 남구현
    • Journal of Chest Surgery
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    • v.17 no.3
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    • pp.398-401
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    • 1984
  • Aortopulmonary septal defect is rare congenital heart disease. An 8-year-old girl was diagnosed as a ventricular septal defect with patent ductus arteriosus at Department of Thoracic and Cardiovascular Surgery of Chungnam National University Hospital. On operation, the defect was confirmed as an aortopulmonary septal defect [Type I], anomalous origin of right pulmonary artery from aorta [Type Ill] and patent ductus arteriosus. The defect was repaired anatomically with cardiopulmonary bypass. But she was not survived because of uncontrollable bleeding from aorta.

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Determination of Alpha Defect Center in the Nature Using EPR Spectroscopy

  • Cho, Young-Hwan;Hyun, Sung-Pil;Pilsoo Hahn
    • Journal of the Korean Magnetic Resonance Society
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    • v.5 no.1
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    • pp.13-18
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    • 2001
  • Natural alpha radiation produced a stable defect center to certain minerals. Electron Paramagnetic Resonance(EPR) spectroscopy is a powerful tool f3r quantifying this defect center. EPR method has been applied to trace alpha-radiation effect around the uranium ore deposit. The results show that EPR technique can be used to measure rapidly and nondestructively the defect center produced by natural alpha radiation. In general, a good correlation was achieved between defect center concentration and actinide elements(U, Th). These results imply that the concentration of defect center is dependent on the alpha radiation dose over long time scale.

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