• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1057-1060
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• 2003

네트워크 사용자들의 다양한 요구를 수용하고 신뢰성이 있는 서비스를 제공하기 위하여 많은 통신 사업자들은 SLA(Service Level Agreement)를 제공하고자 하고 있다. 통신 사업자들은 다양한 네트워크 서비스를 제공하고 있으며 각 네트워크 서비스에 대한 SLA 를 제공하기 위한 SLA 시스템은 유연한 구조를 가져야 한다. SLA 서비스는 계속적인 상황 감시를 통해 서비스 이용자와 계약 상황이 지켜질 수 있도록 해야 한다. 이를 위해서는 SLA 시스템 운용자의 부재시에 운용자에게 긴급 상황을 알려 주는 SMS(Short Message Service) 제공이 필요하다. SLA 시스템 운용자는 여러 등급이 존재하며 관리해야 하는 사항과 서비스도 다양하다. 이런 경우를 고려하여 효과적인 SMS 기능을 SLA 시스템 운용자에게 제공하는 SMS 기능을 본 논문에서 설계하고 구현하였다.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.47-52
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• 2005

In this paper we describe SLA metrics and software architecture for newly upcoming IP TV service. Firstly we show the general description for IP TV. This consists of brief description of IP TV, the general figure of configuration and elements of IP TV network and communication protocol stack of IP TV data transmission for deriving communication quality parameter. And we propose SLA metrics depending on quality measurement point. According to the measurement point the measurable SLA metrics are different. The total view of the IP TV SLA measurement and management architecture is shown. When the quality measurement point is the routers that consist of internet node, the IP media NMS is the quality collection system. And when the quality measurement point is the IP TV STB(Set-Top Box), the IP media collector and Quality Collection Server are the quality collection system. And we show the software block diagram of IP TV SLA processing system and the other related network management systems.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.225-226
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• 2006

A service level agreement (SLA) is a formal contract between a service provider and a subscriber that contains detailed technical specifications called service level specifications (SLSs). In this paper, we propose SLA data analysis system which provides an effective decision-making information to network service provider. The SLA data analysis system executes trend analysis and statistics analysis using SLA violation and refund information. The analysis results are presented in many ways such as tables, graphs.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.6
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• pp.237-249
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• 2010

If one analyzes recent cyber incidents including personal information infringement cases, it seems like actual attack is targeting Internet service providers but actually they are targeting Internet service users. For many users, all the services were not provided to them as they have signed for in the contract or personal informations, which users have provided to service providers when signing contracts, were disclosed to public without users' consent causing aftereffect. As a result, importance of S-SLA indexes, which is to be included in the SLA to be signed between a user and a service provider, is ever more increasing. Especially, if there is a S-SLA indexes for anti-virus services, service providers have to provide a high quality of service as they have signed in the SLA. However, there wasn't any researches in the S-SLA area domestically and there are only limited SLA indexes related to system or service maintenances at the moment. Therefore, this paper analyses security functions in anti-virus services and proposes S-SLA indexes for different security level.

• Journal of Information Technology Applications and Management
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• v.11 no.1
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• pp.101-115
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• 2004

The goal of this research is to improve SLA index that measures service performance level as a result of outsourcing Information system, and also to identify the best application method. This research identifies SLA applied cases and improving points based on the evidence collected from three major financial institutions that utilized outsourcing. First this study analyzes SLA applied cases of two different companies and discusses SLA application improvement possibilities. It then introduces a successful case of a third company that adopted SLA index.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.302-308
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• 2013

Internet is becoming more common with increasing cloud services have been spreading rapidly. A SLA is agreements between service providers and customers of service providers is how to ensure quality of service. SLA in cloud computing environments from the perspective of the IT service providers to customer satisfaction increase for service quality, it will need to differentiate between competing carriers QoS guarantees with SLA is a very important factor. However, the study of SLA in the cloud is staying in its infancy. In this paper, SLA indices for cloud services defining and use them SLA Management System for QoS guarantee has been implemented. The proposed system using monitoring-based migration policy an open source-based cloud computing platform which Cluster Nodes load distribution of virtual machines assigned to their availability, response time, throughput analysis of what affects and is compared with existing cloud.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.4
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• pp.229-237
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• 2013

As demand for IT services increase, which are based on SOA and cloud computing, service level agreements (SLAs) have received more attention in the parties concerned. An SLA is usually a paper contract written in natural language. SLA management tools which are commercially available, implement SLAs implicitly in the application with a procedural language. This makes automation of SLA management difficult. It is also laborious to maintain contract management systems because changes in a contract give rise to extensive modifications in the source code. We see the source of the trouble is the existence of documentary SLAs (paper contracts) and corresponding executable SLAs (contracts coded in the procedural language). In this paper, to resolve the current SLA management problems we propose an active SLM (Active Service Level Management) system, which is based on the active SLA (Active Service Level Agreement). In the proposed system, the separated management and processing of dual SLAs can be unified into a single process with the introduction of active SLAs (ASLAs).

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.245-248
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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 계약관리를 원하고 있다. 일반적으로 SLA는 종이에 자연언어로 표현되어 있어서 SLA 관리나 SLA 기반의 정보처리의 자동화가 제한된다. 이에 본 논문에서는 문서형 SLA를 실행가능한 언어로 표현하는 방법을 제안한다. 그 방법의 핵심은 SLA 문장을 단문, 중문, 또는 복문 형식으로 재구성하고 각 문장을 술어논리로 표현한 뒤, 이를 Prolog 기반 프로그램으로 변환하여 실행가능한 SLA(Active SLA)를 얻는다는 것이다. 이와 함께 ASLA를 활용한 SLA 기반의 계약관리 업무의 자동화에 대한 구체적인 예도 볼 것이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.329-332
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• 2011

최근 클라우드 컴퓨팅 기반의 IT 서비스가 증가하면서 기업들 사이에 SLA가 중요한 화두로 대두되고 있다. 상업용 SLA 관리 툴들은 어플리케이션 또는 데이터베이스 계층에 계약관련 로직을 내장하고 있다. SLA 규칙들이 구현 로직 내에 암시적으로 표현되어 있어서 유지보수가 어렵고 계약사항을 공유하는 데 많은 어려움이 따른다. 따라서 오늘날과 같은 서비스 지향 아키텍처, 온 디맨드, 유틸리티컴퓨팅, 클라우드 컴퓨팅 환경에서는 전체 서비스를 자동 관리할 수 있는 기술에 대한 연구가 반드시 필요하다. 본 논문에서는 능동문서기반의 ASLM(Active Service Level Management)과 유럽에서 진행 중인 SLA@SOI 프로젝트의 계약서 작성 및 실행에 대한 구현 방법을 비교하였다. 비교결과 유지보수성과 자동화 측면을 고려할 때 계약 규칙 로직을 어플리케이션 로직과 분리한 ASLM의 구현방법이 SLA@SOI 보다 SLA 계약처리 업무에 적합함을 알 수 있었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.5
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• pp.434-439
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• 2013

It is very difficult to monitor the blind spots that are not recognized by traditional surveillance camera (CCTV) systems, and the surveillance efficiencies are very low though many accidents/events can be solved by the systems. In this paper, the fuzzy logic based sound source localization system using sound strength in the underground parking lot is suggested and the performance of the system is analyzed in order to enhance the stabilization and the accuracy of the localization algorithm in the suggested system. It is confirmed that the localization stabilization of the localization algorithm (SLA_fuzzy) using the fuzzy logic in the suggested system is 4 times higher than that of the conventional localization algorithm (SLA). In addition to this, the localization accuracy of the SLA_fuzzy in the suggested system is 29% higher than that of the SLA.