• Title, Summary, Keyword: Defect

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Mura Defect Enhancement based on Saliency Map in TFT-LCD Image (TFT-LCD 영상에서 Saliency Map 기반의 얼룩성 결함 강조)

  • Lee, Eun Young;Park, Kil Houm
    • Journal of Korea Multimedia Society
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    • v.19 no.3
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    • pp.626-632
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    • 2016
  • In this paper, we propose the defect emphasis in TFT-LCD panel image. The defect emphasis image consist of S(Shape) map and B(Brightness) map. S map based on DoG(difference of gaussian) is made with the mura defect shape characteristic. And B map use defect intensity property that defect intensity is higher than background. The experiments were conducted to evaluate the performance of the proposed defect emphasis method. The results of experiments show the validity of the defect emphasis using the proposed method.

A study on management and judgement of defect-repair in private housing construction company (민간 주택건설회사의 하자보수에 대한 인식 및 실태에 관한 연구)

  • 윤정숙
    • Journal of the Korean Home Economics Association
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    • v.33 no.5
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    • pp.143-151
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    • 1995
  • The purpose of this study is to suggest a defect-repair management and judgement of apartment housing for the private housing construction company. The objectives are : 1) to investigate how the defect-repair were managed and 2) to suggest the range, period of defect-repair and the proper managial size of housing company. Data were collected by the interviews from the heads of management departments of housing construction companies. Twenty-one companies selected were divided into three groups according to the amount of housing supply. Major result were as follows : 1) departments of defect-repair in housing construction company are divided into sub-system according to the size of housing supply. 2) the judgement of the range and period of defect-repair are extracted. They are, according to the order of their importance, constructional defect, functional defect, aesthetical defect and the defect in use.

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A Study on the Artificial Defect Sensitivity of Fatigue Limit in Austempered Ductile Iron (오스템퍼링처리한 구상흑연주철에서 인공결함에 대한 피로한도 민감도에 관한 연구)

  • Kim, M.G.;Kim, J.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.12 no.3
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    • pp.215-220
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    • 1999
  • Rotary bending fatigue tests were carried out to investigate the artificial defect sensitivity of fatigue limit in annealed and austempered ductile irons. Artificial defect(hole, diameter${\leq}0.4mm$) machined on specimen surface did not bring about an obvious reduction of fatigue limit in austempered ductile iron as compared with annealed. As a result of investigation on $\sqrt{area}$ c which is the critical artificial defect size. $\sqrt{area}$ c of austempered ductile iron is larger than that of annealed. This means that the crack initiation at artificial defect in austempered ductile iron is more difficult in comparison with annealed. In case that the $\sqrt{area}$ c of artificial defect and graphite nodule are same, the rate of crack initiation for graphite nodule is higher than that of artificial defect.

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Trigger design to software defect analysis (소프트웨어 결함 분석을 위한 트리거 설계)

  • Lee, Eun-Seo;Lee, Kyung-Whan
    • The KIPS Transactions:PartD
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    • v.10D no.4
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    • pp.709-718
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    • 2003
  • This research introduces defect and its causes that happen on software development. Based on defect cause analysis, we understand associated relation between defects and them design defect trigger. So, when we achieve similar project, we can forecast defect and prepare to solve defect by using defect trigger.

The effect of the surface defect from micro-hole for fatigue strength (피로강도에 대한 표면미소 결함의 영향)

  • 오환섭
    • Journal of the korean Society of Automotive Engineers
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    • v.11 no.1
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    • pp.51-56
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    • 1989
  • This study was performed to investigate the effect of defect on fatigue strength under the stress of rotary bending. The specimens were made of low carbon steel having artificial microholes, namely, single micro-hole and two adjacent micro-holes as natural defects, and the effects of the diameter of hole and the distance between the holes on fatigue strength have been investigated. The obtained result can be summarized as follows: 1, The critical defect means the largest size of defect that does not affect fatigue limit, and correspondes to the size of defect leading to final fracture under fatigue limit of smooth specimen. The size of defect which has an effect on fatigue limit is larger than that of critical defect. 2, The defect larger than the critical defect affects fatigue strength for as a kind of size effect, and the physical meaning of size effect of defect is considered same as the one of notch effect.

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Analysis of Consulting Reports on Defect Disputes in Apartment Building

  • Seo, Deok-Seok;Park, Jun-Mo
    • Journal of the Korea Institute of Building Construction
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    • v.13 no.5
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    • pp.498-505
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    • 2013
  • The main processes involved in a defect dispute are consulting, reviewing, and finally judging as an arbiter. This process of defect consulting produces a defect consulting report, but business practices and standards of judgment will differ among consultants, and have many problems. This study reviews the structure of a defect consulting report and considers the structure's problem, which is that it is not standardized. To achieve this, data of sixteen defect consulting report were collected involving defect lawsuit cases before or after 2010. The structure and index of the defect consulting reports were then reviewed, and the results are as follows. As for a structure based on fourteen index, there are suitable that judge a outline, a cost estimate data and a consulting work item by a consulting standard. Furthermore, analysis by each common parts and private parts is considered as appropriate about consulting items and estimate by standard. However, consulting item in construction progress and responsibility period for security that related on a cause and a responsibility of defect need to complement. Meanwhile, the first thing of issues are connected a defect consulting is urgent a standardization for a defect type.

The Design & Manufacture and Characteristic Analysis of Eddy Current Sensor for Bolt Hole Defect Evaluation (볼트 홀 결함 평가용 와전류 센서 설계제작 및 특성분석)

  • Ahn, Y.S.;Gil, D.S.;Park, S.G.
    • Journal of Power System Engineering
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    • v.15 no.4
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    • pp.37-41
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    • 2011
  • This paper introduces the special eddy current sensor and its characteristic for bolt hole defect evaluation in gas turbine rotor. In the past, Fluorescent penetration inspection method was used for qualitative defect evaluation in gas turbine rotor bolt hole. This method can defect the bolt hole defect but can not evaluate the defect size. Nowadays, eddy current method is used quantitative defect evaluation due to advanced sensor design technology. And eddy current method is more time and cost saving than the old method. We developed bolt shape eddy current sensor for the rotor bolt hole defect detection and evaluation. The eddy current sensor moves to the bolt hole guided by screw nut and detects the defect on the bolt hole. The bolt hole mock-up and artificial defects were made and used for the signal detection & resolution analysis of eddy current sensor. The results show that signal detection capability is enough to detect 0.2 mm depth defect. And the resolution capability is enough to differentiate 02, 0.5, 1.0 and 2.0 mm depth defect.

Ventricular Septal Defect with Aortic Insufficiency: A Report of 7 Cases (대동맥판막 폐쇄부전증을 동반한 심실중격결손증 -7례 보고-)

  • 조대윤
    • Journal of Chest Surgery
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    • v.12 no.1
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    • pp.50-55
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    • 1979
  • The development of aortic insufficiency radically alters the physical findings which are generally associated with ventricular septal defect that was not hemodynamically significant, and the combination of the two lesions produces a typical clinical picture, that may be serious and life-threatening when it is left untreated. Therefore, the selection of patients, type and timing of surgical treatment is considered to be important. Among 114 cases of ventricular septal defect treated surgically utilizing cardiopulmonary bypass in the Department of Thoracic Surgery, Seoul National University Hospital, 7 cases were associated with aortic insufficiency. 1. Five cases were male, and 2 cases were female. Ages were from 4 years to 24 years, and mean age was 11.9 years. 2. In all cases, ventricular septal defect was closed with Teflon patch. In a case, a aortic valvuloplasty and in another, a aortic valve replacement with Hancock valve 23 mm., 5 months after the closure of ventricular septal defect were done. 3. Four cases were type I ventricular septal defect by Kirklin`s classification, 3 cases were type II ventricular septal defect, and diameters of ventricular septal defect were from 3.5 cm. to 0.7 cm. A PDA. was combined to a type I ventricular septal defect. 4. In 5 cases, herniation of the aortic cusp through the ventricular septal defect and in a case, annulus dilatation on the aortic valve was noted. 5. Two cases with type I ventricular septal defect and severe pulmonary hypertension expired. A re-opened case with type II ventricular septal defect expired. 6. Four cases were alive, and all of them show decrease of pulse pressure and aortic insufficiency.

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Defect Cell Extraction for TFT-LCD Auto-Repair System (TFT-LCD 자동 수선시스템에서 결함이 있는 셀을 자동으로 추출하는 방법)

  • Cho, Jae-Soo;Ha, Gwang-Sung;Lee, Jin-Wook;Kim, Dong-Hyun;Jeon, Edward
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.5
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    • pp.432-437
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    • 2008
  • This paper proposes a defect cell extraction algorithm for TFT-LCD auto-repair system. Auto defect search algorithm and automatic defect cell extraction method are very important for TFT-LCD auto repair system. In the previous literature[1], we proposed an automatic visual inspection algorithm of TFT-LCD. Based on the inspected information(defect size and defect axis, if defect exists) by the automatic search algorithm, defect cells should be extracted from the input image for the auto repair system. For automatic extraction of defect cells, we used a novel block matching algorithm and a simple filtering process in order to find a given reference point in the LCD cell. The proposed defect cell extraction algorithm can be used in all kinds of TFT-LCD devices by changing a stored template which includes a given reference point. Various experimental results show the effectiveness of the proposed method.

Growth and Dissolve of Defects in Boron Nitride Nanotube

  • Lee, Jun-Ha;Lee, Hoong-Joo
    • Journal of the Semiconductor & Display Technology
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    • v.3 no.3
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    • pp.23-25
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    • 2004
  • The defect formation energy of boron nitride (BN) nanotubes is investigated using molecular-dynamics simulation. Although the defect with tetragon-octagon pairs (4-88-4) is favored in the flat cap of BN nanotubes, BN clusters, and the growth of BN nanotubes, the formation energy of the 4-88-4 defect is significantly higher than that of the pentagon-heptagon pairs (5-77-5) defect in BN nanotubes. The 5-77-5 defect reduces the effect of the structural distortion caused by the 4-88-4 defect, in spite of homoelemental bonds.

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