• Journal of KIISE
• /
• v.42 no.5
• /
• pp.591-600
• /
• 2015

SLA (Service Level Agreement) is an essential factor that must be guaranteed to provide a reliable and consistent service to user in cloud computing environment. Especially, a contract between user and service provider with SLA is important in an environment using a cloud service brokerage. The cloud computing is classified into IaaS, PaaS, and SaaS according to IT resources of the various cloud service. The existing SLA is difficult to reflect the quality factors of service, because it only considers factors about the physical Network environment and have no methodological approach. In this paper, we suggested a method to specify the quality characteristics of software and proposed a mechanism and structure that can exchange SLA specification between the service provider and consumer. We defined a meta-model for the SLA specification in the SaaS level, and quality requirements of the SaaS were described by the proposed specification language. Through case studies, we verified proposed specification language that can present a variety of software quality factors. By using the UDDI-based mediation process and architecture to interchange this specification, it is stored in the repository of quality specifications and exchanged during service binding time.

• Journal of Astronomy and Space Sciences
• /
• v.18 no.3
• /
• pp.209-218
• /
• 2001

Global exposure time distribution through all-sky survey, one of main science missions of KAISTSAT-1, has been simulated. Exposure time distribution has its minimum on the celestial equator and increases with moving to polar regions according to the present mission operation scenario. SAA (South Atlantic Anomaly) and the moon can make further decreases of exposure time around the celestial equator Effects of SAA on all-sky survey exposure time can be compensated with a simple observational scheduling, orbit exchange between orbits allocated to all-sky survey passing through the SAA region and ones allocated to upper atmosphere observations not affected by SAA. It, however, seems that present exposure time distribution is not adequate for the concrete study of the evolution of interstellar medium. A scheme for active time allocation is needed for redistribution of exposure times weighted around the celestial poles, and additional studies on the advanced mission operation and the observational scheduling are also needed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.05a
• /
• pp.799-800
• /
• 2015

정보시스템의 복잡성과 컴퓨팅 환경의 변화에 따라 시스템 성능 및 용량 산정의 중요성이 점점 부각되고 있다. 특히, 클라우드 컴퓨팅은 막대한 서버자원이 필요하기 때문에 보다 체계적이고 정확하게 HW 용량을 산정하는 것은 중요한 요소이다. 클라우드 컴퓨팅은 이제 도입기를 지나 성숙기를 향해 빠르게 진보하고 있는 상황이다. 지금까지 클라우드는 IaaS, PaaS, SaaS 등으로 발전해왔다. 특히, 국내 다수의 IT 서비스 기업들은 클라우드 인프라가 구축된 기업들과 MOU를 맺고 SaaS를 제공하고 있다. 따라서, 클라우드 서비스의 기본이 되는 SaaS를 위한 하드웨어 용량 산정 기법에 관한 연구는 향후 클라우드 내에서 다양한 사업으로 확장하는데 필요한 기반 연구이다. 이에, 본 연구에서는 SaaS 기반의 하드웨어 용량산정에 대한 방법과 기준을 제시하였다. 본 연구의 결과는 클라우드 컴퓨팅 환경구축 시 HW용량산정에 대한 가이드라인으로 활용 가능하다.

• Journal of the Korean Ceramic Society
• /
• v.29 no.7
• /
• pp.517-524
• /
• 1992

For the present study two alumina bodies were prepared. The sinter-aid alumina body(SAA) was made by conventional sinter-process using sintering additives of TiO2 & MgO/CaO and the reaction-bonded alumina (RBA) made from Al-Al2O3 mixed powder. A comparison was made between those two bodies and this investigation seeks to evaluate their microstructure, physical properties and material's reliability as well as their fracture behaviour. In spite of its considerable microstructural densification accompanied by sintering shrinkage, SAA is largely inferior to RBA in fracture strength. However, SAA shows a somewhat higher m-value than RBA in respect to the material's reliability, the Weibull modulus(m). RBA, which has high fracture strength, shows much longer lifetime under static loading than SAA. Though, as with m of fracture strength, the reliability(mt) of lifetime prediction in RBA is less high than of SAA.

• New & Renewable Energy
• /
• v.16 no.1
• /
• pp.25-30
• /
• 2020

In this study, an SW for the analysis of the wind-turbine vibration characteristics was developed as an application of SaaS cloud infrastructure. A measurement system for power-performance, mechanical load, and gearbox vibration as type-test class was installed at a target MW-class wind turbine, and structural meta and raw data were then acquired into the cloud. Data processing algorithms were developed to provide cloud data to the SW. To operate the SW continuously, raw data was downloaded consistently based on the algorithms. During the SW test, an intermittent long time-delay occurred due to the communication load associated with frequent access to the cloud. To solve this, a compression service for the target raw data was developed in the cloud and more stable data processing was confirmed. Using the compression service, stable big data processing of wind turbines, including gearbox vibration analysis, is expected.

• International Journal of Contents
• /
• v.12 no.4
• /
• pp.23-30
• /
• 2016

For a library to be able provide information services and fulfill its function as a knowledge convergence center capable of responding to various information demands, the development of next-generation information systems based on the latest information and communication technology is needed. The development of mobile information services using portable devices such smart phones and tablet PCs and information systems which incorporate the concepts of cloud computing, SaaS (Software as a Service), annotation and Library2.0 is also required. This paper describes a library information system that utilizes collective intelligence and cloud computing. The information system developed for this study adopts the SaaS-based cloud computing service concept to cope with the shift in the mobile service paradigm in libraries and the explosion of electronic data. The strengths of such a conceptual model include the sharing of resources, support of multi-tenants, and the configuration and support of metadata. The user services are provided in the form of software on-demand. To test the performance of the developed system, the efficiency analysis and TTA certification test were conducted. The results of performance tests, It is encouraging that, at least up to 100MB, the job time is approximately linear and with only a moderate overhead of less than one second. The system also passed the level-3 or higher criteria in the certification test, which includes the SaaS maturity, performance and application program functions.

• Proceedings of the Korean Information Science Society Conference
• /
• 2011.06c
• /
• pp.115-118
• /
• 2011

코호트 연구를 위한 식사조사 프로그램에 대한 수요는 나날이 증가하고 있는 반면 프로그램의 공급은 원활하지 않은 실정이다. 이 때문에 식사조사 프로그램을 SaaS 플랫폼을 기반으로 하는 연구가 활발해 지고 있다. 대부분의 SaaS 플랫폼 기반 소프트웨어는 멀티테넌시 기술을 지원한다. 하지만 멀티테넌시 기술을 지원하기 위해서는 데이터베이스에서 여러 테넌트를 지원해야 하기 때문에 구조의 변화가 불가피 하다. 멀티테넌시를 구현하기 위해서는 논리적인 스키마로부터 물리적인 스키마로의 매핑기술이 필요하다. 데이터베이스 스키마 매핑 기술에는 Pivot table, Chunk table 등이 있는데 이 기술을 이용하여 기존의 DB구조를 변경하여 여러 테넌트가 DB를 공유할 수 있고 결합될 수 있어야 한다. 이에 본 논문에서는 SaaS 기반 식사조사를 위한 pivot table과 chunk table을 보이고 실험을 통하여 chunk table구조가 좀 더 효율적이라는 사실을 보인다.

• The Journal of the Korea Contents Association
• /
• v.10 no.12
• /
• pp.77-83
• /
• 2010

Recently, IT-based environment is changing rapidly as changing in web services platform, evolution of cloud computing environments and expanding the base of a smart market. Accordingly, monitoring development of environment is changing quickly. So a customizable SaaS-based monitoring tool is required to provide monitoring services. It has to support a variety of environmental monitoring and a resource managers with requested information, and by an enhanced monitoring framework in clouding environment of management system. In this paper, the 3D viewer for the management of sensor node management system was designed and built. Through the 3D viewer by enhancing the accessibility and visibility, the sensor network will allow resources to be used efficiently.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2011.10a
• /
• pp.88-90
• /
• 2011

It is a very important to manage inventory quickly and accurately in Refrigerated commercial warehouses in which a lot of logistics are often shipping and receiving. Because most of systems for managing refrigerated warehouses consist of COBOL, it will be raised maintenance costs. There is no service for consignees who are consumer of refrigerated warehouses and they use only a fax or a phone for orders. In this paper, we design a web mobile middleware platform supporting legacy systems and based on SaaS which supports a variety of value-added services which are fit consignees, solving problem of outdated legacy systems and no services for consignees.

• Proceedings of the Korea Contents Association Conference
• /
• 2015.05a
• /
• pp.295-296
• /
• 2015

콘텐츠 관리 시스템을 SaaS로 제공 할 수 있는 플랫폼을 개발 하였다. 서비스 제공자는 본 플랫폼에서 제공하는 API와 기본 기능을 활용하여 다양한 콘텐츠 관리 시스템을 직접 개발 할 수 있으며, 개발 완료 후에 해당 시스템을 일반 사용자에게 SaaS 형태로 본 플랫폼을 통해 서비스 할 수 있다. 이를 통해 다양한 요구사항과 저렴한 비용으로 콘텐츠 관리 시스템을 사용하고자 하는 중소 규모의 기업 또는 단체를 대상으로 콘텐츠 관리 시스템 구축 및 서비스 제공 비즈니스를 실현 할 수 있다.