• 제목/요약/키워드: Defect Risk

검색결과 253건 처리시간 0.029초

공동주택 마감공사의 하자유형별 분석 및 위험성 평가 방법에 관한 연구 (An Examination of a Risk Assessment Method and Analysis of Defect Types of Apartment Finishing Works)

  • 손승현;이재현;손기영
    • 한국건축시공학회지
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    • 제24권2호
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    • pp.249-260
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    • 2024
  • 최근 공동주택의 주거 비율이 높아짐에 따라 이에 따른 하자분쟁이 증가하고 있는 추세이다. 이러한 하자들 중에서도 마감공사는 발생빈도가 가장 높으며 이를 보수하기 위한 막대한 비용이 발생한다. 그러므로 이러한 문제를 해결하기 위해 하자 발생빈도 및 보수비용을 활용한 하자위험도를 미리 도출하여 하자순위별로 사전에 예방할 수 있는 관리기법의 개발이 필요하다. 따라서 본 연구에서는 공동주택 마감공사의 하자유형별 분석 및 위험성 평가 방법을 도출하는 것을 목적으로 한다. 이를 위해, 최근 준공된 마감공사 하자사례를 조사하여 하자위험 우선순위를 도출하고 하자관리를 위한 위험성 평가방법을 제시하였다. 본 연구의 결과는 공동주택 마감공사의 품질향상을 위한 관리제도 개선의 근거자료로 활용될 것이다.

품질 기능 전개법과 위험 부담 관리법을 조합한 설계 최적화 기법의 용접 품질 감시 시스템 개발 응용 (Weld Quality Monitoring System Development Applying A design Optimization Approach Collaborating QFD and Risk Management Methods)

  • 손중수;박영원
    • 제어로봇시스템학회논문지
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    • 제6권2호
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    • pp.207-216
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    • 2000
  • This paper introduces an effective system design method to develop a customer oriented product using a design optimization process and to select a set of critical design paramenters,. The process results in the development of a successful product satisfying customer needs and reducing development risk. The proposed scheme adopted a five step QFD(Quality Function Deployment) in order to extract design parameters from customer needs and evaluated their priority using risk factors for extracted design parameters. In this process we determine critical design parameters and allocate them to subsystem designers. Subsequently design engineers develop and test the product based on these parameters. These design parameters capture the characteristics of customer needs in terms of performance cost and schedule in the process of QFD, The subsequent risk management task ensures the minimum risk approach in the presence of design parameter uncertainty. An application of this approach was demonstrated in the development of weld quality monitoring system. Dominant design parameters affect linearity characteristics of weld defect feature vectors. Therefore it simplifies the algorithm for adopting pattern classification of feature vectors and improves the accuracy of recognition rate of weld defect and the real time response of the defect detection in the performance. Additionally the development cost decreases by using DSP board for low speed because of reducing CPU's load adopting algorithm in classifying weld defects. It also reduces the cost by using the single sensor to measure weld defects. Furthermore the synergy effect derived from the critical design parameters improves the detection rate of weld defects by 15% when compared with the implementation using the non-critical design parameters. It also result in 30% saving in development cost./ The overall results are close to 95% customer level showing the effectiveness of the proposed development approach.

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Complete Repair of Coarctation of the Aorta and a Ventricular Septal Defect in a 1,480 g Low Birth Weight Neonate

  • Lee, Hong-Kyu;Cho, Joon-Yong;Kim, Gun-Jik
    • Journal of Chest Surgery
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    • 제44권2호
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    • pp.183-185
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    • 2011
  • Although outcomes of neonatal cardiac surgery have dramatically improved in the last two decades, low body weight still constitutes an important risk factor for morbidity and mortality. In particular, cardiac surgery in neonateswith very low birth weight (${\leq}$1.5 kg) is carried out with greater risk because most organ systems are immature. We report here on a successful case of early one-stage total repair of coarctation of the aorta and a ventricular septal defect in a 1,480 gram neonate.

Impact Analysis of Construction Delay: The Case of Defects In the Top-down Construction Method

  • Suk, Janghwan;Kwon, Woobin;Soe, Jang-woo;Cho, Hunhee
    • 국제학술발표논문집
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    • The 9th International Conference on Construction Engineering and Project Management
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    • pp.213-221
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    • 2022
  • Defects are the risk factors in the construction process of buildings. They cause damage, delaying the construction duration. They especially cause adverse effects on the top-down construction method. This study analyzed the degree of construction delay induced by each work type, focusing on defects in the top-down method. Then, we derived construction delay induction coefficient from different work types in order by using the severity of construction delay per defect and the occurrence probability of defect; this assessment model measures the impact of defects on construction delay for each work type. Furthermore, by comparing each work type based on the defect frequency and the construction delay induction coefficient, we found work types that need to be administered attentively. We identified that plastering work was easy to overlook, requiring caution in defect management. This study provides an efficient defect management system suitable for the buildings that are built using the top-down construction method.

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심내막상 결손증에 대한 임상고 (Clinical study of endocardial cushion defect: 37 cases report)

  • 조재일;서경필
    • Journal of Chest Surgery
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    • 제17권4호
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    • pp.657-665
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    • 1984
  • Thirty-seven patients had undergone repair of a endocardial cushion defect between 1977 and Aug. 1983 in Seoul National University Hospital. Twenty eight had a partial defect, one intermediate defect and eight complete endocardial cushion defect. Tricuspid cleft was found in 4 cases and mitral cleft was in all p-ECD. Seven patients were of type C anatomy in c-ECD. Four patients had associated major anomalies, including three TOF in c-ECD, one coarctation in p- ECD. In p-ECD patients, the septal defect was closed with patch in all cases and the atrioventricular valvular insufficiency was corrected with MVR in 4 cases, TVR in 1 case and simple interrupted sutures in remainders. In c-ECD patients the septal defect was closed with single patch except one case. The atrioventricular valve was repaired with simple interrupted sutures except one MVR and TVR case. The operative mortality was 14.2% in p-ECD, 44.4% in c-ECD, but recent 3 years [1980-1983] mortality was 8.7% in p-ECD, 20% in c-ECD. More than grade III systolic regurgitant murmur was oted postoperatively in 4 cases of c-ECD and 3 cases of p-ECD. The operative risk factors were preoperative NYHA classification, cyanosis, Rp/Rs, systolic pressure of main pulmonary artery and the degree of regurgitation of atrioventricular valves. The causes of death were low cardiac output syndromes, pulmonary complications and arrhythmias.

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Large Atrial Septal Defect Closure in a Patient with Severe Pulmonary Arterial Hypertension

  • Supomo, Supomo;Hartopo, Anggoro Budi;Anggrahini, Dyah Wulan;Darmawan, Handy;Dinarti, Lucia Kris
    • Journal of Chest Surgery
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    • 제50권5호
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    • pp.378-381
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    • 2017
  • Patients with an atrial septal defect (ASD) and severe pulmonary arterial hypertension (PAH) are considered ineligible for defect closure surgery because of the risk of right ventricular decompensation and death after the operation. We report the case of a patient with large ASD and severe PAH who was able to undergo defect closure surgery successfully following long-term use of combined oral sildenafil and beraprost.

GIS에서 주파수 특성을 갖는 이중 대역법에 의한 UHF 부분방전 측정기술 (UHF Partial Discharge Measurement Technology using a Dual Bands Methods to have the Frequency Characteristics in GIS)

  • 이상화;선종호;강동식;김광화
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제55권3호
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    • pp.127-133
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    • 2006
  • This Paper describes a dual bands PD measurement method which has two different bandwidths. The one bandwidth is 0.5 - 2 GHz and the other is 1 - 2GHz. This method is used for GIS diagnosis. In the experiment, it shows that the ratios between two PD quantities in dual bands depend on the defect types and gas pressures. The variations of ratios in different pressures are more sensitive than ones in defect types. And These ratios increase with increasing SF6 gas pressures. As these ratios give us additive information of PD we can analyze the defect type as well as risk assessment for the GIS reliably. Therefore the above result shows that these ratios are one of parameters for diagnosing GIS.

선천성 심질환에 대한 중재적 치료술의 최근 진전 (Recent advances in transcatheter treatment of congenital heart disease)

  • 최재영
    • Clinical and Experimental Pediatrics
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    • 제49권9호
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    • pp.917-929
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    • 2006
  • Over the last several decades there has been a remarkable change in the therapeutic strategy of congenital heart disease. Development of new tools and devices, accumulations of experience, technical refinement have positively affected the outcome of interventional treatment. Many procedures including atrial septostomy, balloon valvuloplasty, balloon dilation of stenotic vessel with or without stent implantation, transcatheter occlusion of abnormal vascular structure, transcatheter closure of patent arterial duct and atrial septal defect, are now performed as routine interventional procedures in many institutes. In diverse conditions, transcatheter techniques also provide complementary and additive role in combination with surgery. Intraoperative stent implantation on stenotic vessels, perventricular device insertion, and hybrid stage 1 palliative procedure for hypoplastic left heart syndrome have been employed in high risk patients for cardiac surgery with encouraging results. Transcatheter closure of ventricular septal defect has been performed safely showing comparable result with surgery. Investigational procedures such as percutaneous valve insertion and valve repair are expected to replace the role of surgery in certain group of patients in the near future. Continuous evolvement in this field will contribute to reduce the risk and suffering from congenital heart disease, while surgery will be still remained as a gold standard for significant portion of congenital heart disease.

Salvage of an exposed cranial prosthetic implant using a transposition flap with an indwelling antibiotic irrigation system

  • Hwang, Sung Oh;Chang, Lan Sook
    • 대한두개안면성형외과학회지
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    • 제21권1호
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    • pp.73-76
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    • 2020
  • Cranial implant removal is recommended if implants become exposed owing to scalp necrosis after cranioplasty. However, it carries the risk of extensive bleeding, and the resultant cranial defects can cause both aesthetic and functional problems. We present a case of a scalp defect exposing a cranial prosthetic implant that was reconstructed with a local flap and salvaged using an indwelling antibiotic irrigation system. A 73-year-old man presented with scalp necrosis after undergoing cranioplasty due to intracranial hemorrhage. The cranial implant was exposed through the scalp defect. Methicillin-resistant Staphylococcus aureus was detected in the culture from the open wound. After debridement of the necrotic tissue and burring of the superficial layer of the implant, a transposition flap was used to cover the defect and an indwelling antibiotic irrigation system was installed. Continuous irrigation with vancomycin was conducted for 5 days, and intravenous vancomycin was continued for 4 weeks. The flap was in good condition at 4 months postoperatively, with no infection. The convex contour of the scalp was well maintained. The patient's neurological status was stable. Exposed cranial implants can be salvaged with continuous antibiotic irrigation as an alternative to implant removal; thus, the risk of bleeding and possible disfigurement may be avoided.

Reconstruction of Large Bone and Soft Tissue Defect Combined with Infection in the Lower Extremity with Free Flap Followed by Ipsilateral Vascularized Fibular Transposition

  • Chung, Duke Whan;Han, Chung Soo;Lee, Jae Hoon;Kim, Eun Yeol;Park, Kwang Hee;Kim, Dong Kyoon
    • Archives of Reconstructive Microsurgery
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    • 제22권2호
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    • pp.57-62
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    • 2013
  • Purpose: The aim of this study is to report on the results and discuss the role of free flap followed by ipsilateral vascularized fibular transposition (IVFT) for reconstruction of large bone and soft tissue defect combined with infection by open tibia fracture. Materials and Methods: During the research period, lasting from December 2002 to June 2008 (Kyung Hee University Medical Center), data were collected from three patients who underwent IVFT after free flap. We analyzed the successiveness and persistency of the infection using free flapping, bone union, and hypertrophy between transposed fibula and tibia. Results: Regarding free flap, successive results were observed in all examples. In the final follow-up results, transposed fibulas all survived, having hypertrophy similar to that of adjacent tibia. Conclusion: Reconstruction of tibia defect with free flap followed by IVTF is a useful and safe method for avoidance of the potential risk of infection for patients with a large tibial bone defect and soft tissue defect associated with infection.

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