• Journal of the Korean Society of Safety
• /
• v.27 no.6
• /
• pp.109-114
• /
• 2012

This study is the things to experiment and evaluate the performance of self-healing water-proofing on the concrete to be using the crystal growth composite waterproofing admixture. The cylinder to be making on the concrete by ${\varnothing}150{\times}300$ mm for evaluating the performance of self-healing water-proofing was aging 90 days and cut on a 50 mm. So, it prompted the crack and applied. After it measured the quantity of water to be flow the water throughout the crack part of the cylinder, it applied the basic formular of Darcy's law and calculated the coefficient of water permeability. So, it verified the performance of self-healing water-proofing on the basis of the changing shape of the water permeability. This experiment is the thing to be applied the general evaluation of the structure to demand the real watertightness on doing for the evaluating of performance of the quantity of water leak and self-healing water-proofing about the various penetration crack.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.04a
• /
• pp.247-248
• /
• 2022

3D printer-based self-healing capsules have been proposed to heal cracks by enabling various structural designs, repeatable fabrication, and strength analysis of the capsules. The Fusion Deposition Modeling (FDM) method was used to design, analyze, and produce new self-healing capsules that are widely used at low cost. However, PLA extruded from FDM has low interlayer adhesion energy, and thus strength varies depending on the angle of load applied to the laminated layer and the concrete structure, thereby degrading the performance of the self-healing capsule. Therefore, in this paper, the structure of the capsule manufactured by the FDM PLA method has isotropic strength was designed. In addition, the fracture strength in the x, y, and z directions of the load applied through the compression test was analyzed. As a result, it was confirmed that the newly proposed capsule design has an isotropic fracture strength of 1400% in all directions compared to the existing spherical thin-film capsule.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2008.11a
• /
• pp.9-12
• /
• 2008

근래에 들어와 시스템의 복잡성에 대한 문제가 제기되고 있다. 그 해결책으로 대두되고 있는 자가치유 시스템이란 자율 컴퓨팅의 개념 중 하나로 사람의 개입 없이 시스템의 이상상태을 인식하고 정상상태로 복귀 가능한 시스템을 의미한다. 이를 달성하기 위해서는 가장 먼저 필요한 것은 시스템의 어떤 부분에서 어떤 이상이 일어났는지 파악하는 것이다. 그래서 내외부적으로 여러 가지 접근을 통한 시스템에서의 이상여부를 파악하기 위한 모니터링 기법들이 연구되고 있다. 그렇지만, 기존의 여러 모니터링 기법에서는 부분에 초점을 두어 전체적인 시스템의 감시를 위한 다른 방법이 필요하다. 본 논문에서는 이를 해결하기 위하여 현재 부곽되고 있는 AOP(Aspect Oriented Programming)기법을 적용하여 각 기능의 수행범위 / 제약사항을 조절하며 기능적인 작은 이상을 파악한다. 또한, 모듈-기능 관계리스트를 사용하여 이상이 발생하였을 경우 어떤 요구사항이 위반되었는지 파악하고, 해당 기능들에 근거한 State-diagram을 사용함으로 시스템의 전체 흐름 상의 이상 발생을 감시하는 구조를 제안한다. 그리고 Case Study를 통해 실제 이 방법을 적용한 시스템의 감시가 가능하다는 것을 증명했다.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.27 no.4
• /
• pp.564-572
• /
• 2000

We decided among extraction, orthodontic traction and autotransplantation such as direction and position of unerupted tooth, degree of developing root apex, eruption space, being of supernumerary tooth or odontoma or cyst when tooth impacted. Autotransplantation is considered when orthodontic traction is unrealistic or when tooth movement can absorb root of neighbor tooth. The prognosis for successful autotransplantation is dependent on a number of factors such as root development, surgical technique, patient's age, endodontic treatment, time and type of splinting, preservation of periodontal ligament and storage medium. Especially when severe osseous defect is being, bone graft considered for reducing of mobility and for assisting recovery. In all cases, chief complaint is unerupted tooth and various causing factors were supernumerary, odontoma, ectopia and so on. Before autotransplantation, space regaining was done if needed and demineralized freezed dried bone and autogenous bone graft was done when there is severe osseous defect by extraction of supernumerary tooth or odontoma. Splinting was removed after 2-3weeks At 3-4weeks after autotransplantation, endodontic treatment was decided. At follow up check, normal recovery was done and there was no inflammatory or replacement root resorption in periapical radiograph.

• Journal of Periodontal and Implant Science
• /
• v.36 no.4
• /
• pp.913-923
• /
• 2006

목적 : 최근 발치 후 즉시 임플란트 식립은 널리 사용되는 수술 방식이다. 이 연구의 목적은 임플란트 주위 골결손시 Ca-P으로 표면 처리된 이종골을 사용하여 골재생을 평가하기 위함이다. 재료와 방법 : 두 마리의 개 모델에서 하악 소구치와 제일 대구치를 발치하였다. 발치 6주 후 trephine bur를 이용하여 7.5 mm 지름과 5 mm 깊이를 가진 결손부를 형성하였다. 이 후 이 결손부의 중앙에 3.5 mm 지름과 15mm 길이의 fixture(GS II)를 식립하였다. 결과적으로 임플란트와 주변을 둘러싸고 있는 골 사이에는 2.0 mm정도의 gap이 만들어진다. 준비된 결손부 내로 자기골 또는 $Biocera^{(R)}$를 채웠다. 각각 4주, 8주 후 조직 절편을 제작하였다. 조직학적 평가를 위해 Block biopsy를 시행하였다. 결과 : 두 집단 모두 임상적으로 골이 완전히 채워졌다. 자가골이 이식된 부위(control)의 평균 골-임플란트 접촉(BIC)은 각각 4주째 $28.2{\pm}19%$였고, 8주째 $44.9{\pm}9%$였다. $Biocera^{(R)}$가 이식된 부위(test)의 평균 BIC는 각각 4주째 $34.6{\pm}27%$였고, 8주째 $27.6{\pm}23%$였다. 자가골이 이식된 부위(control)의 평균 골밀도는 각각 4주째 $32.7{\pm}25%$, 8주째 $37.4{\pm}17%$였다. 골-임플란트 접촉(BIC)과 골밀도의 평균 비율(%)은 비슷하였다. 조직학적으로 자가골과 이종골 이식 부위 모두 주변골과 잘 조화를 이루었고 유사한 치유 양상이 관찰되었다. 자가골과 이종골 이식 부위간 유의한 차이는 없었다.(P>0.05) 결론 : 임플란트 주위 2 mm의 골 결손부위에 자가골 또는 이종골로 채운 경우 유사한 결과를 얻었다. 이 결과 임플란트 fixture 주위의 골 결손부 해소를 위해 자가골을 대체할 수 있는 재료로 $Biocera^{(R)}$를 사용할 수 있음을 보여준다.

• The Journal of the Korean bone and joint tumor society
• /
• v.9 no.1
• /
• pp.24-30
• /
• 2003

Purpose: To clarify the results of simple bone cyst (SBC) treatment in children by percutaneous autologous bone marrow grafting and xenografting. Materials and Methods: We studied seven cases (4 males, 3 females) of SBC, which were treated by percutaneous autologous marrow and heterograft bone grafting from January 1996 to February 1999. Their mean age at surgery was 10 years (6 to 15), and the mean follow-up period was 35.6 months (20 to 52). Three cases were located in the proximal and middle humerus; three cases were in the proximal femur; and one case occurred in the ilium. Mean volume was 14.7 $cm^2$ (10 to 23). Six cases were active, and one was inactive. Five patients had a history of receiving a mean of 3.2 steroid injections. The mean quantity of bone marrow used in treatment was 14.3 ml (10 to 20), and the mean amount of $Lubboc^{(R)}$ heterograft bone (Transphyto S.A. Clermont Ferrand, France) used was 6.4 blocks (5 to 10). Results were analyzed using the modified Neer classification. Results: Five cases completely healed with obliteration of the cyst cavity (Grade IV). Two cases demonstrated sclerosis around a partially visible cyst (Grade III). All treatment results were satisfactory and without intraoperative or postoperative complications. Conclusione: Percutaneous autologous marrow and heterograft bone grafting is recommended as an effective treatment method for simple bone cyst. It offers ease of operative technique, a high rate of healing, a low recurrence rate, low morbidity, a low incidence of postoperative complications, and free from bone graft donor site problems.

• Journal of dental hygiene science
• /
• v.13 no.2
• /
• pp.158-164
• /
• 2013

The most frequently encountered problems at fixture-implantation sites are lack of adequate bone and proximity to anatomic structures. It is generally accepted that growth factors play an essential role in the healing process and tissue formation, and they have become the focus of grafting materials research. The granules in platelets contain high concentrations of various growth factors. In particular, platelet-rich fibrin (PRF) is a second-generation platelet concentrate that allows the production of fibrin membranes enriched with platelets and growth factors from an anticoagulant-free blood harvest. This study investigated the in vitro effects of PRF on osteoblasts, in terms of the key cellular functions, and especially the effects on two growth factors, the homodimer of platelet-derived growth factor subunit B (BPDGF-BB) and transforming growth factor (TGF)-${\beta}1$, which are associated with wound healing and regeneration (i.e., proliferation and differentiation). The following parameters were investigated: PDGF-BB and TGF-${\beta}1$ levels in PRF, cell viability, alkaline phosphatase (ALP) activity, type 1 collagen synthesis, and the expressions of osteoblast differentiation markers (ALP and runt-related transcription factor 2) and bone matrix proteins (type 1 collagen). The release of autologous growth factors from PRF was maintained for a reasonable period of time, and exerted positive effects on the proliferation and differentiation of osteoblasts. The use of PRF thus appears to be a promising method for enhancing bone healing and remodeling.

• Journal of Korean Ophthalmic Optics Society
• /
• v.13 no.4
• /
• pp.161-169
• /
• 2008

Purpose: To better understand the corneal regeneration after alkali burn regarding the initial clinical progression and the therapy, we investigated the changes of the multi factors following chemical injury in cornea. Methods: This study was performed to observation on the healing process of alkali burned cornea in aspect of immunohistochemistry by immunofluorescence or H-E staining and TUNEL assay. Results: The results showed that although a healing process occurred after alkali burn, apoptosis of epithelial, stromal and endothelial cells in the cornea was continuously observed. Neovascularization and expression of ${\alpha}$-smooth muscle actin (${\alpha}$-SMA) from limbus and from injured cornea, respectively, were observed after 3 days of alkali burn. Formation of collagen III in corneal stroma and increased expression of chondroitin sulfate are coincident with expression of ${\alpha}$-SMA and transforming growth factor-${\beta}$ (TGF-${\beta}$). Conclusions: These data suggest that medical treatment within 3 days of alkali burn will be effective to inhibit neovascularization and formation of collagen III and chondroitin sulfate. This study extends our immumohistochemical understanding of healing process in alkali burned cornea, and the results get in this study will be cornerstones in the development of therapeutic agent for accelerating renewal of chemical damaged cornea.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.5 no.1
• /
• pp.23-32
• /
• 2009

Although the web is becoming a widely accepted medium, it provides relatively poor performance and low availability. A cluster consists of a collection of interconnected stand-alone computers working together and provides a high-availability solution in application area such as web services or information systems. Web server clusters require a high-availability service with a proactive and practical fault management. However, as the system complexity grows, it is not easy to meet the requirement. Therefore, web server clusters must have self-fault management capability for meeting high-availability requirement. In this paper, we propose high availability web server clusters using self-healing technique with a minimal human intervention. Our experimental results show that a proposed method can be used to improve the availability of web server clusters.

• Proceedings of the KIEE Conference
• /
• 2006.10c
• /
• pp.130-132
• /
• 2006

디지털 경제로의 전환에 따른 디지털 부하의 출현과 고품질, 고신뢰도의 전력요구, 거대장치산업과 분산형 네트워크의 조화, 수요자의 역할 변화 등 전력산업의 패러다임이 변화되고 있다. 이러한 전력산업의 변화는 최종소비자의 디지털 부하에 기인하여, 기존의 단순 검침기능으로만 활용되던 전력량계가 소비자 서비스를 위한 게이트웨이로 변모되며, 소비자내 전력기기와 상호 연동되고, 분산된 신재생에너지와 연계된 배전망 및 자가 치유형 전력망으로의 변화를 가져올 것이다. 그러나 현재의 전력시스템은 과거 100여 년간 산업사회를 지향한 하부구조를 지니고 있어 디지털 사회의 요구에 부웅하기 위해서는 새로운 전력시스템이 요구되고 있다. 이를 위해 최신의 정보기술을 적용한 개방형 통합 전력시스템 구축에 대한 연구가 진행중이다. 본 논문은 개방형 통합 전력시스템의 기반이 되는 아키텍처 개발에 대한 연구동향과 아키텍처 개발 방법 및 네트워크 요구조건에 대하여 소개한다.