• 제목/요약/키워드: Repair Type

검색결과 835건 처리시간 0.031초

A decision support system for diagnosis of distress cause and repair in marine concrete structures

  • Champiri, Masoud Dehghani;Mousavizadegan, S.Hossein;Moodi, Faramarz
    • Computers and Concrete
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    • 제9권2호
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    • pp.99-118
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    • 2012
  • Marine Structures are very costly and need a continuous inspection and maintenance routine. The most effective way to control the structural health is the application of an expert system that can evaluate the importance of any distress on the structure and provide a maintenance program. An extensive literature review, interviews with expert supervisors and a national survey are used to build a decision support system for concrete structures in sea environment. Decision trees are the main rules in this system. The system input is inspection information and the system output is the main cause(s) of distress(es) and the best repair method(s). Economic condition, severity of distress, distress situation, and new technologies and the most repeated classical methods are considered to choose the best repair method. A case study demonstrates the application of the developed decision support system for a type of marine structure.

공동주택관리법 하자담보책임 종료 확인 절차의 문제점 및 개선방안 (On the problem and improvements about 'End of Confirmation for Defect Liliability' on the Management of Apartment Houses Decree)

  • 김진국;방홍순;김옥규
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2017년도 춘계 학술논문 발표대회
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    • pp.274-275
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    • 2017
  • Decree on the Management of Apartment Houses. Article 36 (Liability for warranty Repair Defects), Article 37 (About Repair Defect, etc), and its implementing ordinances, Article 36 (Term of warranty liability) Article 37 (Defect criteria), Article 38 (procedure of Repair defect), Article 39 (type of warranty liability), Enforcement Rule Article 17 (Certifiation of warranty liability). On the basis of the upper Decree, In spite of Standard and forms of 'Completion of Repair Defect' was exist, it was hard to receive 'End of Confirmation' in practice. The purpose of this study is to propose basics in order that Practitioners can apply problems and improvements about Decree on the Management of Apartment Houses.

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Ni Plating Technology for PWR Reactor Vessel Cladding Repair

  • Hwang, Seong Sik;Kim, Dong Jin
    • Corrosion Science and Technology
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    • 제18권5호
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    • pp.190-195
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    • 2019
  • SA508 low-alloy steel for a reactor vessel was exposed to primary water in a pressurized water reactor (PWR) plant because the cladding layer of type 309 stainless steel for the RPV was removed, due to an accident in which the detachment of the thermal sleeve occurred. The major advantage of the electrochemical deposition (ECD) Ni plating technique is that the reactor pressure vessel can be repaired without significant thermal effects, and Ni has solid corrosion resistance that can withstand boric acid. The corrosion rate assessment of the damaged part was performed, and its trend was analyzed. Essential variables of the Ni plating for repair of the damaged part were derived. These conditions are applicable variables for the repair plating device, and have been carefully adjusted using the repair plating device. The process for establishing ASME technical standards called Code Case N-840 is described. The process of developing Ni-plating devices, and the electroplating procedure specification (EPS) are described.

균열보수용 폴리머 시멘트 복합체의 폴리머 종류에 따른 점도와 충전성에 관한 연구 (A Study on the Viscosity and Compaction of Polymer-Cement Composites According to Types of Polymer for Crack Repair)

  • 박동엽;권우찬;조영국
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2022년도 가을 학술논문 발표대회
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    • pp.161-162
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    • 2022
  • The purpose of this study is to determine the viscosity of the polymer-cement composites(PCCs) for crack repair of RC structures and to investigate its compaction. According to the study on the viscosity and compaction property of PCCs for crack repair, the viscosity of PCCs varies greatly depending on the polymer type and polymer cement ratio, and by mixing silica fume into PCCs, appropriate viscosity and excellent flow can be controlled without separation of cement and water. As a result of this study, basic data on the viscosity, fluidity, and compaction properties of PCCs for crack repair of RC structure can be obtained.

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탄소섬유 분사형 복합재 유지보수 로봇의 보수성능평가 (Performance Evaluation for Repair of Composite Maintenance Robot Using Carbon Fiber Spray Method)

  • 송근수;천대한;이재열;신광복
    • Composites Research
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    • 제37권2호
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    • pp.76-85
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    • 2024
  • 본 논문에서는 보수를 위해 생성된 혼합물을 손상부위에 자동으로 분사하여 보수하는 탄소섬유 분사형 복합재 유지보수 로봇을 개발하였다. 로봇 개발을 위해 불연속 탄소섬유와 에폭시 수지(Epoxy resin) 및 경화제가 혼합된 보수용 혼합물을 손상부위에 분사한 뒤 경화시키는 보수공정을 개발하였다. 이후, 개발된 보수공정의 자동화를 위해 협동로봇(Collaborative robot)을 기반으로 보수용 혼합물을 손상부위에 자동으로 흡입 및 분사하는 말단장치(End of arm tool, EOAT)를 개발하였다. 개발된 로봇의 보수성능평가를 위해 복합재 인장시험 규정 ASTM D3039에 의거하여 0° 및 90°일방향 시편 제작 및 시험을 수행하였다. 시험은 손상되지 않은 시편, 손상된 시편, 그리고 손상 후 로봇에 의해 자동으로 보수된 시편에 대해 수행되었다. 시험 결과, 0와 90° 시편에 대해 각각 보수 후 약 10%와 90%의 인장강도 회복율이 확인되어 개발된 탄소섬유 분사형 복합재 보수 로봇의 보수성능을 검증하였다.

결정성장형 자기치유 고상캡슐을 혼합한 보수 모르타르의 품질 및 균열 치유 특성에 관한 실험적 연구 (An Experimental Study on the Quality and Crack Healing Characteristics of Repair Mortar Containing Self-Healing Solid Capsules of Crystal Growth Type)

  • 오성록;김철규;남은준;최연왕
    • 한국구조물진단유지관리공학회 논문집
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    • 제24권1호
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    • pp.59-66
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    • 2020
  • 본 연구에서는 보수 모르타르와 직접 혼합 가능한 결정성장형 자기치유 고상캡슐을 제조하였으며, 자기치유 고상캡슐이 혼합된 보수 모르타르의 품질 및 균열 치유 성능 특성을 평가하였다. 자기치유 고상캡슐을 혼합한 보수 모르타르의 테이블 플로우 및 공기량 평가 결과 혼합율에 관계없이 테이블 플로우 및 공기량은 큰 영향이 없는 것으로 나타났다. 압축강도는 캡슐 혼합율이 증가할수록 강도가 감소하는 경향이 나타났다. 정수위 투수시험에 따른 균열 치유 특성 평가 결과 초기 투수량이 감소하는 결과가 나타났으며, 시간 경과에 따라 반응 생성물 발생하여 균열이 치유되는 것을 확인 할 수 있었다.

비 운동선수에 있어 단독 제 2형 SLAP 병변의 관절경적 봉합수술의 임상적 결과 (The Clinical Outcomes of Arthroscopic Repair of Isolated type II SLAP Lesion in Non-athletes)

  • 유재철;안진환;고경환;김승연
    • 대한관절경학회지
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    • 제12권3호
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    • pp.185-190
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    • 2008
  • 목적: 비 운동선수에 있어 제 2형 SLAP 병변의 관절경적 봉합수술의 결과를 알아보고 단독 제2형SLAP 병변이 있는 군과 봉합이 필요치 않은 극상건의 부분층 파열을 동반한 군간의 임상적 결과를 비교해보고자 하였다. 대상 및 방법: 2005년 7월부터 2007년 1월까지 제 2형 SLAP 병변에 대해 관절경적 봉합수술을 시행 받은 총 142예의 환자 중 50세 미만 비 운동선수를 대상으로 하였으며 이 중 같은 부위에 수술, 골절, 반복적인 탈구의 병력이 있거나, 봉합을 요하는 회전근개 전층 또는 50% 이상의 부분층 파열을 동반한 경우, 감염, 관절염, 염증성 질환을 동반한 경우는 제외하여 총 19예의 환자를 대상으로 하였다. 이 중 13예는 봉합이 필요치 않은 극상건의 부분층 파열을 동반하고 있었고(그룹 I), 6예는 단독 제 2형 SLAP 병변을 가지고 있었다(그룹 II). 평균 연령은 36.7세(29-49세)였으며 평균 증상 기간은 39.1개월(3-216개월)이었고 평균 추시 기간은 19.0개월(12-27개월)이었다. 외상의 병력은 그룹 I에서 9명, 그룹 II에서 5명 있었다. 모든 환자에서 술 전후로 관절운동범위, 통증 및 기능 VAS, Constant 점수 및 UCLA 점수를 측정하였다. 결과: 그룹 I에서 견관절의 외회전은 최종 추시시 의미있게 감소하였으며(p=0.003) 그 밖의 관절운동 범위는 그룹에 관계없이 모두 술전 상태로 회복되었고(p>0.05), 그룹간에도 차이가 없었다(p>0.05). 최종 추시에서 모든 평가 점수(Constant 점수, UCLA 점수, 통증 VAS, 기능 VAS)는 술 전에 비해 통계적으로 유의하게 향상되었다(p<0.05) : UCLA 점수는 $22.8{\pm}5.2$에서 $32.8{\pm}2.1$; Constant 점수는 $79.4{\pm}8.6$에서 $94.9{\pm}4.3$; 통증 VAS는 $5.4{\pm}2.7$에서 $1.1{\pm}1.4$; 기능 VAS는 $63.2{\pm}15.3$에서 $93.4{\pm}7.3$으로 향상되었다. 하지만 평균 UCLA 점수 및 Constant 점수의 그룹간 비교에서 두 그룹간 통계적으로 유의한 차이는 보이지 않았다. 결론: 비 운동선수에 있어 제 2형 SLAP 병변의 관절경적 봉합술은 임상적으로 좋은 결과를 보였으며 동반된 극상건의 부분층 파열은 1년 추시에선 최종결과에 영향을 미치지 않았다.

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Minimally Invasive Mitral Valve Repair in a Woman with Marfan Syndrome and Type B Dissection

  • Lim, Mi Hee;Je, Hyung Gon;Lee, Sang Kwon
    • Journal of Chest Surgery
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    • 제51권1호
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    • pp.61-63
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    • 2018
  • We report the case of a patient with mitral regurgitation complicated by type B dissection and Marfan syndrome (MFS) who was managed successfully with minimally invasive mitral valve repair. Without type A aortic dissection or aortic root dilation, MFS patients may develop mitral valve regurgitation, as in this case, and need valve surgery to improve their symptoms and long-term survival. However, it is not clear that a full sternotomy and prophylactic aortic surgery are necessary. Although retrograde perfusion to the dissected aorta is controversial, our approach minimizes the risk of future anticipated aortic surgery in MFS patients.

농촌주택 유형분석을 통한 재생우선순위 도출 (Selection of Priority for Revitalization by Analyzing Rural House Type)

  • 박길범;박준모;김옥규;방세라
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2014년도 춘계 학술논문 발표대회
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    • pp.174-175
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    • 2014
  • A Rural house in Chungcheong area have been variety of matters, rapid deterioration of house and incomplete of maintenance control, that is represented lack of durability heating from lack of heat insulation property, health worsening form use of toxic substance and so on. For farmers who did not know where to repair and how to repair, they are urgently needed measures of standard and basis that is to realize a condition of rural house. Accordingly, this study drew major matters and priority for revitalization through analysis of type of rural house from research on the actual condition in order to develope of diagnostic criteria of rural house.

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Advantages of Scorpion Suture Passer and 70 Degrees Arthroscope in Arthroscopic Bankart Repair: Usefulness for Inferior Labral Repair

  • Hyun, Yoon-Suk;Shin, Woo-Jin
    • Clinics in Shoulder and Elbow
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    • 제20권4호
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    • pp.201-207
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    • 2017
  • Background: The blunted tip of a reusable with multiple uses can cause problems with the passing procedure in arthroscopic Bankart repair. This study assessed the advantage of Scorpion with a $70^{\circ}$ arthroscope in arthroscopic Bankart repair compared to hook typed suture passer. Methods: Scorpion in 19 patients, the hook type suture passer (conventional group) in 18 patients were used. All patients underwent the same procedure except for the type of suture passer used. Another different point of the procedure were telescopes and the number of portals used; three arthroscopic portals (posterior, anterorsuperiorlateral, and mid-anterior) and a $30^{\circ}$ arthroscope in the conventional group, but two portals and a $70^{\circ}$ arthroscope as well as the $30^{\circ}$ one in the Scorpion group. The surgery time and the surgical complications including an iatrogenic axillary nerve injury were recorded. Results: The Scorpion group showed a significant decrease in surgery time compared to the conventional group. In contrast to the conventional group, Scorpion provided an easy estimation of the exit of suture passing, no iatrogenic labral injury during the passing procedure with straight movement and the sharp tip of the knife installed. Iatrogenic supraspinatus injuries could be avoided when making an accessory anteosuperiorlateral portal due to the $70^{\circ}$ arthroscope. Conclusions: In arthroscopic Bankart repair, the use of the Scorpion suture passer and a $70^{\circ}$ arthroscope can reduce the surgery time, avoid unnecessary supraspinatus injury, and avoid iatrogenic axillary nerve damage through the relatively easy and precise suture passing and saving of the anterosuperior portal.