• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.33 no.5
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• pp.405-418
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• 2007

Mesenchymal stem cells(MSCs) have been though to be multipotent cells that can replicate that have the potential to differentiate into lineages of mesenchymal tissue including the bone, cartilage, fat, tendon, muscle, and marrow stroma. Especially, scaffolds to support cell-based tissue engineering are critical determinants of clinical efforts to regenerate and repair the body. Selection of a matrix carrier imvolves consideration of the matrix's role as a scaffold for physical support and host tissue integration as well as its ability to support of synergize the osteoinductive program of the implanted mesenchymal stem cell. The aim of this study is to evaluate the effect of autobone and Bio-$Oss^{(R)}$ to adherent mesenchymal stem cells as scaffolds on sinus augmentation with fibrin glue mixture in a rabbit model. 16 New Zealand White rabbits were divided randomly into 4 groups based on their time of sacrifice(1, 2, 4 and 8 weeks). First, mesenchymal stem cells were isolated from iliac crest marrow of rabbits and expanded in vitro. Cell culture was performed in accordance with the technique described by Tsutsumi et al. In the present study, the animals were sacrificed at 1, 2, 4 and 8 weeks after transplantation, and the bone formation ability of each sides was evaluated clinically, radiologically, histologically and histomorphologically. According to the histological observations, autobone scaffolds group showed integrated graft bone with host bone from sinus wall. At 2 and 4 weeks, it showed active newly formed bone and neovascularization. At 8 weeks, lamellae bone was observed in sinus graft material area. Radiologically, autobone with stem cell showed more radiopaque than Bio-$Oss^{(R)}$ scaffolds group. there were significant differences in bone volume between 4 and 8 weeks(p<0.05).

• 대한치과보철학회:학술대회논문집
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• 1994.05a
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• pp.30-30
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• 1994

• 대한치과보철학회:학술대회논문집
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• 1999.04a
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• pp.92.1-92.1
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• 1999

• Bulletin of the Korean Chemical Society
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• v.30 no.2
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• pp.499-501
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• 2009

• Bulletin of the Korean Chemical Society
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• v.30 no.3
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• pp.700-702
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• 2009

• The Journal of the Korean dental association
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• v.51 no.12
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• pp.643-649
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• 2013

The aim of this study was to achieve the healing of peri-implantitis defects and the hard tissue regeneration using the augmentation of a xenograft on defect site. Two patients were treated with the surgical approach. With a full muco-periosteal flap elevation, the implant surfaces were exposed and taken the debridement of granulation tissue around the abutment. Each surface of the abutments was prepared with the air-abrasive device (PerioFlow$^{(R)}$) for decontamination. Bovine-derived bone mineral (Bio-Oss collagen$^{(R)}$) was then used to fill the defects, and no membrane was placed on the grafting site. Radiographs and clinical photo was taken to compare from baseline status. Within the limits of the present case, this case shows the significance of the surgical treatment of peri-implantitis. And this also verifies the stability of bovine-derived bone mineral and effectiveness of Air-abrasive device (PerioFlow$^{(R)}$).

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.385-387
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• 2003

인터넷 이용자의 폭발적인 증가는 통신망 및 서비스 전반에 걸쳐 많은 변화를 야기하고 있다. 액세스계의 경우 음성전화 위주의 PSTN 시대에서는 동선을 기반으로 한 비교적 단순한 구조를 하고 있었으나 초고속 인터넷의 보급 확산에 따라 다양한 대안기술들이 등장하고 이에 따라 설비 등을 관리하기 위한 여러 종류의 시스템들이 개발 활용되고 있다. 또한 초고속망의 등장과 유무선 복합화의 추세에 따라 이용자의 Needs를 충족시키기 위한 다양한 서비스들이 출현함에 따라 고객서비스의 처리 등을 위한 관리 시스템들이 서비스에 종속적으로 개발 운용되고 있는 실정이다. 통신망 기술 및 서비스에 종속적인 형태로 개발 운용되는 기존의 OSS들로서는 현재와 같은 통신 사업자 자간의 극심한 경쟁과 서비스간의 carnivalism이 존재하는 사업환경에서는 지속적인 운용비용(Operating Expense ; OPEX)의 증가는 물론 상품/서비스의 적기 시장 출하에도 많은 지장을 초래하여 그 개선대책이 절실한 현실이다. 본고에서는 초고속인터넷 시대에서 기존의 운용관리 시스템들이 지닌 문제점을 고찰하고 이에 대한 개선 방안을 논한 후에 새로운 체계로 전환해 가기 위한 시스템의 구현시 선택 가능한 기술에 관하여 서술할 것이다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.2
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• pp.127-132
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• 2010

Recently, the importance of quality control on the online collaboration system is increasing, since it is realized that many participants do not guarantee the quality of online collaboration's output anymore. Hence in this paper, we propose the framework of quality control in order to assure the quality of output from online collaboration system. The proposed framework provides the solution strategies to overcome the challenges of current collaboration systems. To do that, first of all we define the basic process (create, initiate, discuss, complete) of the online collaboration system based on wiki-based system or open source project, and then we find the challenges in each online collaboration process, and propose the effective strategy to overcome these challenges with reference cases including Wikipedia, OSS project, etc.

• 대한치주과학회:학술대회논문집
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• 2002.11a
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• pp.111-111
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• 2002

• 대한치주과학회:학술대회논문집
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• 2001.12a
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• pp.83-83
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• 2001