• The Journal of Korean Academy of Prosthodontics
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• v.58 no.2
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• pp.77-85
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• 2020

Purpose: The aim of the present study was to investigate the effects of N-acetyl cysteine (NAC) loading on the bone formation surrounding sandblasted, large-grit and acid-etched (SLA) implants. Materials and methods: Implantation of NAC loaded SLA implants (NSI group) and SLA implants (SI group) was performed bilaterally in the mandible of 4 adult beagle dogs (each group, n = 8). The animals were sacrificed after a healing period of 3 and 6 weeks, respectively (n = 2 animal each). Dissected blocks were processed for histomorphometrical analysis. Bone to implant contact percentage (BIC%) and bone volume (BV%) were assessed histomorphometrically. Results: BIC% of NAC loaded SLA implants were about 50% higher than that of SLA implants at 3 weeks of bone healing, but not significantly (51.79 vs 35.43%; P=.185). BV% of NAC loaded SLA implants were significantly higher than that of SLA implants at 3 weeks of bone healing (45.09 vs 37.57 %; P=.044). At 6 weeks of bone healing, BIC% and BV% of two experimental groups were similar (P>.05). Conclusion: Within the limits of the present study, NAC loading have a positive effects on the early bone formation surrounding SLA implants. So, it might be concluded that NAC loading enhance the osseointegration and shorten the healing time after implantation of the SLA implants.

• The korean journal of orthodontics
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• v.36 no.5
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• pp.324-330
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• 2006

Objective: The purposes of this study were to evaluate the differences between sand blasted, large grit and acid-etched (SLA) treated mini-implants and smooth surface orthodontic mini-implants in relation to the removal torque as well as the histologic analysis. Methods: Custom-made, screw-shaped, titanium implants with a length of 9.5 mm and an outer diameter of 1.8 mm were divided into 2 groups; the SLA group (20 SLA treated orthodontic mini-implants) and the smooth surface group (20 smooth surface mini-implants), and placed In the tibia metaphysis of 10 rabbits. Each rabbit had 4 mini-implants placed, 2 in each tibia. The right tibia were implanted with the SLA group mini-implants and the left tibia had the smooth group mini-implants placed. Each mini-implant group were immediately applied with a continuous traction force of 150 g using a Ni-Ti coil spring. The rabbits were sacrificed 6 weeks post-surgically. Subsequently, the legs were stabilized, the Ni-Ti coil springs were removed and the mini-implants were removed under reverse torque rotation with a digital torque gauge. Results: 6 weeks after placement, the SIA group presented a higher mean removal torque value (8.29 Ncm) than the smooth group (3.34 Ncm) and histologic analysis revealed a higher new bone formation aspect along the screw in the SLA group. Conclusion: Results of this study indicates that SLA treated mini-implants may endure higher orthodontic forces without loosening.

• Korean Chemical Engineering Research
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• v.62 no.1
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• pp.105-111
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• 2024

The SLA (Stereolithography Apparatus) method is a type of 3D printing technique predicated on the transformation of liquid photocurable resin into a solid form through UV laser exposure, and its application is increasing in various fields. In this study, we conducted research to enhance the hydrophobicity and transparency of SLA 3D printing surfaces for microfluidic system production. The enhancement of surface hydrophobicity in SLA outputs was attainable through the application of hydrophobic coating methods, but the coating durability under different conditions varied depending on the type of hydrophobic coating. Additionally, to simultaneously achieve the required transparency and hydrophobic properties for the fabrication of microfluidic systems, we applied hydrophobic coatings to the proposed transparency enhancement method from prior research and compared the changes in contact angles. Teflon coating was proposed as a suitable hydrophobic coating method for the fabrication of microfluidic systems, given its excellent transparency and high coating durability in various environmental conditions, in comparison to titanium dioxide coating. Finally, we produced an Electrophoresis of Charged Droplet (ECD) chip, one of the digital microfluidics systems, using SLA 3D printing with the proposed Teflon coating method (Fluoropel 800). Droplet manipulation was successfully demonstrated with the fabricated chip, confirming the potential application of SLA 3D printing technology in the production of microfluidic systems.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.553-555
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• 2005

SLA는 네트워크 서비스 사업자와 가입자 사이에 서비스 품질을 정의하는 협약으로서, 일정 수준의 서비스 제공을 위해 SLA 관리 시스템(SLM)의 필요성이 대두되었다. 본 논문에서는 SLA에 대한 데이터 분석을 통해 네트워크 사업자에게 신속하고 효율적인 의사결정 지원정보를 제공할 수 있는 SLA 데이터 분석 시스템을 제안한다. 본 논문의 시스템은 SLM의 일반정보, 위반정보, 과금정보 등을 바탕으로, 각각 추이분석과 통계현황 기능을 수행한다. 분석 결과는 테이블, 그래프 등의 다양한 형태로 제공되며, 분석 결과에 대해서는 각각의 분석 모형에 대한 개요 및 기준치 등을 제시함으로써 시스템에 대한 신뢰성을 높일 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1431-1434
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• 2001

E-Business 성공은 기존의 제품 마케팅 차원을 넘어서 전자상거래를 비롯한 기반 IP 기술의 지원과 관리에 있다. 새로운 e-Business를 시작하는 대부분의 중소형사업자는 e-Business Outsourcing Value Chain을 이용하여 서비스를 제공하고 있으며, 그중 가장 중요한 카운터 파트너로서 Web HSP를 들고 있다. 본 논문에서는 Web HSP와 사용자사이에서 제공되는 웹서비스의 새로운 패러다임에서 SLA 구조와 컴포넌트를 Network, Hosting, Application, Management 관점에서 정의하고, 이를 관리하기 위한 SLA Management 구조를 제시하였다. 본 논문의 결과로 고객은 자신의 사업에 적합한 SLA 파라미터를 제시하는 Web HSP를 찾게 될 것이며, Web HSP는 고객에게 필요한 SLA의 컴포넌트 제공과 효율적인 관리 기능을 수행함으로 서비스의 경쟁력을 얻게 될 것이다.

• Journal of Information Technology Services
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• v.8 no.4
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• pp.141-150
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• 2009

There are no objective standards for selection and improvement of SLA evaluation metrics for IT service. In this study, we analyze the current IT maturity models for selection and improvement of the metrics and then we derive them according to the maturity levels and propose the redesigned maturity model. To verify whether the model is applicable, we execute a case study based on the D company. We apply the proposed evaluation metrics of the maturity models to the D company and evaluate the metrics. We select a proper level of the D company and an improvement line after measuring evaluation metrics in the maturity level 2. We propose improvement guidelines of evaluation metrics which score is less than the improvement line's and derive SLA evaluation metrics. By using the SLA evaluation metrics for a year, we prove that the way of selection and improvement is useful.

• Transactions of Materials Processing
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• v.4 no.4
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• pp.335-344
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• 1995

In this paper, an experimental study of a hot forging process is carried out using plasticine and the die set manufactured with the aid of rapid prototyping. In order to manufacture the die set, Stereolithography Apparatus(SLA) which is most widely used rapid prototyping system is introduced. Turbine blade forging is performed using palsticine and the SLA prototype die set. Through the experiment, it has been shown that SLA prototype is suitable to the die set for the plasticine workpiece, and the formability and the forming load of turbine blade forging are predicted.

• Journal of Korean Institute of Industrial Engineers
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• v.18 no.1
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• pp.63-80
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• 1992

The concept of rapid prototyping intended for a significant reduction in cost and lead time becomes even more practical with the recent development of various equipments to make the concept concrete. For the purpose of real application of commercially available SLA(stereolithography apparatus), this paper is intended to develop the standard conversion procedure from CAD data to the input data for SLA. While the procedure presented in this paper is based on CAD system "CATIA" and SLA of 3D systems, Inc., which are being used in authors' company DAEWOO Motor Co., Ltd., the basic concept of this paper can be applied to any other CAD systems and machines of using stereolithography process. The algorithm presented in this paper is classified into two stages-node sampling and triangulation. First of all, point data are sampled through the node sampling procedure, and then these are triangulated so that the input data for SLA operation is finally generated. The suggested method is devised in a way to meet the input requirements of SLA and more importantly consume less computation time and generate less number of input data for SLA.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.279-282
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• 2011

최근 기업들이 SOA, 웹 서비스, 유틸리티 컴퓨팅, 클라우드 컴퓨팅 등과 같은 서비스 지향적인 컴퓨팅 환경에 관심을 가지면서 SLA(Service Level Agreement) 기반의 자동화된 계약관리의 수요가 증가하고 있다. 일반적으로 기업에서는 종이에 자연언어로 표현된 SLA를 사용하고 있다. 이를 SLM(Service Level Management) 시스템에서 이해하고 계약조항을 직접 실행시키는 한 방법으로서 본 논문에서는 ASLA(Active SLA) 도입을 제안하였다. ASLA에서는 계약조항이 내용이 Prolog로 표현 된다.사람이 계약조항을 분석하여 Prolog로 표현할 때는 사람에 따라 변환 결과가 달라질 수 있을 뿐만 아니라 작업시간이 많이 소요된다는 단점이 있다. 본 논문에서는 제한된 자연어로 작성된 SLA를 APE(Attempto Parsing Engine)를 사용하여 ASLA를 얻는 방법을 제안한다. 그 방법의 핵심은 SLA ${\rightarrow}$ [APE Parser] ${\rightarrow}$ DRS(Discource Representation Structure) ${\rightarrow}$[drs2prolog] ${\rightarrow}$ Prolog 프로그램 ${\rightarrow}$ [prolog2xml] ${\rightarrow}$ ASLA로 요약할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.335-338
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• 2008

IT아웃소싱은 기업이 핵심 분야와 비 핵심 분야를 나눈뒤 전략적으로 비 핵심분야에 대한 기능을 서비스 제공자에게 위탁하여 특정 기능을 수행하도록 하는 경영기법으로 비용절감, 조직의 슬림화등 여러 가지 목적으로 실행된다. 그리고 최근에 들어 국내에서도 정보시스템을 서비스 제공자에게 아웃소싱 하는 일이 활성화 되고 있는 상황이다. 그리고 IT아웃소싱 계약서에는 서비스 수준이나 가치, 성과에 대한 보상 및 패널티를 부과하는 도구인 SLA를 도입하고 있고 그 측정 결과를 통해 제공받는 서비스의 품질을 확인하고 있다. 그러나 측정된 SLA지표를 통해서 확인되는 데이터는 하드웨어적인 측정치에 한정되어 아웃소싱을 통한 IT서비스의 수준 향상을 확인하기 어려우며 효과적인 SLA 기준 지표 선정이 쉽지 않아 실제적인 고객만족도를 확인하기 어려운 실정이다. 이에 본 연구에서는 ITIL에 기반 한 SLA측정 결과와 사용자 만족도를 측정하여 제시하였다.