• 한국멀티미디어학회논문지
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• 제24권1호
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• pp.75-94
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• 2021

The 4th industrial revolution needs a fusion of artificial intelligence, robotics, the Internet of Things (IoT), edge computing, and other technologies. For the fusion of technologies, cloud computing technology can provide flexible and high-performance computing resources so that cloud computing can be the foundation technology of new emerging services. The emerging services become a global-scale, and require much higher performance, availability, and reliability. Public cloud providers already provide global-scale services. However, their services, costs, performance, and policies are different. Enterprises/ developers to come out with a new inter-operable service are experiencing vendor lock-in problems. Therefore, multi-cloud technology that federatively resolves the limitations of single cloud providers is required. We propose a software platform, denoted as Cloud-Barista. Cloud-Barista is a multi-cloud service common platform for federating multiple clouds. It makes multiple cloud services as a single service. We explain the functional architecture of the proposed platform that consists of several frameworks, and then discuss the main design and implementation issues of each framework. To verify the feasibility of our proposal, we show a demonstration which is to create 18 virtual machines on several cloud providers, combine them as a single resource, and manage it.

• 한국멀티미디어학회논문지
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• 제23권2호
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• pp.328-342
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• 2020

As the cloud-based ICT(Information & Communication Technology) infrastructure matures, the existing monolithic software development method is evolving into a micro-service structure based on cloud native computing. To develop and operate the services efficiently under the cloud native environment, DevOps-based application development plans through MSA(Micro Service Architecture) design based are essential. A cloud native environment is an approach to developing and running applications that take advantage of cloud computing models such as automation of source distribution, container-based virtualization, application scalability, resource efficiency, and flexible maintenance through object independence. To implement this approach, the utilization of key elements such as DevOps, continuous delivery, micro service, and containers is essential, but there are not enough previous studies on case analyses or application methods of these key elements. Therefore, in this paper, we analyze the cases of application development in cloud native environment and propose the optimized application development process and development method through small and medium-sized SI projects.

• Journal of Biosystems Engineering
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• 제43권4호
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• pp.440-444
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• 2018

Purpose: Cloud-computing technology has several advantages, including maintenance, management, accessibility, and computing power. A greenhouse-control system utilizing these advantages was developed using a private cloud-computing system. Methods: A private cloud needs a collection of servers and a suite of software tools to monitor and control cloud-computing resources. In this study, a server farm, operated by OpenStack as a cloud platform, was constructed using servers, and other network devices. Results: The greenhouse-control system was developed according to the fundamental cloud service models: infrastructure as a service, platform as a service, and software as a service. This system has four additional advantages - security, control function, public data use, and data exchange. There are several considerations that must be addressed, such as service level agreement, data ownership, security, and the differences between users. Conclusions: When the advantages are utilized and the considerations are addressed, cloud-computing technology will be beneficial for agricultural use.

• International Journal of Computer Science & Network Security
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• 제24권7호
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• pp.123-127
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• 2024

Cloud computing services has gained increasing popularity in recent years for supporting various on demand and scalable services for IT consumers where there is a need of less investment towards infrastructure. While storage architecture of cloud enjoys a more robust and fault-tolerant cloud computing network, such architecture also poses a number of security challenges especially when applied in applications related to social networks, Financial transactions, etc. First, as data are stored and maintained by individual virtual machines so Cloud resources are prone to hijacked. Such attacks allow attackers to create, modify and delete machine images, and change administrative passwords and settings successfully. hence, it is significantly harder to ensure data security. Second, Due to dynamic and shared nature of the Cloud, data may be compromised in many ways. Last but not least, Service hijacking may lead to redirect client to an illegitimate website. User accounts and service instances could in turn make a new base for attackers. To address the above challenges, we propose in this paper a distributed data access control scheme that is able to fulfil fine-grained access control over cloud data and is resilient against strong attacks such as compromise and user colluding. The proposed framework exploits a novel cryptographic primitive called attribute-based encryption (ABE), tailors, and adapts it for cloud computing with respect to security requirements

• 한국산학기술학회논문지
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• 제17권1호
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• pp.367-373
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• 2016

국가공간정보체계(NSDI)는 국가 공공기관의 공간정보를 통합 연계하여 공동 활용하기 위한 목적으로 2008년부터 추진되어 2012년 그 사업을 완료하였다. NSDI의 존재에도 불구하고 각 기관의 공간정보와 NSDI의 공간정보가 동시에 갱신되지 않는 방식을 사용하기 때문에 최신성 확보에 어려움이 있다. 공공기관의 공간정보를 활용한 서비스 사용현황을 살펴보면, 재활용이 가능한 비슷한 서비스가 중복 구축 및 운영되고 있으며 이에 따라 국가 예산이 낭비되고 있다. 이러한 이슈들은 전산자원을 공유하기 위한 목적의 클라우드 시스템을 NSDI에 적용함으로써 해결될 수 있다. 본 논문에서는 서비스 클라우드 기반의 NSDI 확대발전 방안을 다룬다. 제안되는 NSDI의 확대 발전 방안은 공간정보 서비스 클라우드 시스템 구축방안과 거버넌스 체계 수립방안을 포함한다. 시스템 구축방안에서는 서비스 시나리오, 목표 시스템의 개념도, 그리고 서비스 기능이 도출된다. 서비스 기능에서는 제안된 두 가지 모듈에 대한 단위 기능과 세부 기능을 도출한다. 거버넌스 체계 수립방안에서는 서비스 클라우드 기반의 NSDI 운영을 위한 서비스 라이프사이클 단계별 조직의 필요역할을 정의하고 업무 프로세스를 도출한다. 제안된 시스템 구축방안을 기반으로 상세 시스템을 설계하고 조직을 구성함으로써 서비스 클라우드 기반의 NSDI 체계가 구축될 수 있을 것으로 기대된다.

• 한국컴퓨터정보학회논문지
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• 제22권12호
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• pp.179-186
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• 2017

Managing students' data is a high prioritized duty of the university administration since most of the school affairs are proceed based on that database. Universities have invested in IT assets such as servers, storage, database, and networks. However, continuing investment in IT infrastructure is impossible due to limited budget and rapid changes in the educational environment. As cloud computing diffuse, universities are trying to reduce costs and improve efficiency by increasing server utilization, unlike when physically investing. We designed a hypothetical academic information management system based on cloud computing by utilizing the advanced server virtualization technology. This administrative cloud system allows universities to improve the availability of the system with low cost. The system demonstrates its flexibility of using data resources and immediacy of resumption.

• 디지털산업정보학회논문지
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• 제10권3호
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• pp.181-196
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• 2014

Cloud computer technology currently provides diverse services based on a comprehensive environment ranging from hardware to solution, network and service. While the target of services has been extended from institutions and corporations to personal infrastructure and issues were made about security problems involved with protection of private information, measures on additional security demands for such service characteristics are insufficient. This paper proposes a multi-session authentication technique based on the characteristics of SaaS (Software as a Service) among cloud services. With no reliable authentication authority, the proposed technique reinforced communication sessions by performing key agreement protocol safe against key exposure and multi-channel session authentication, providing high efficiency of performance through key renewal using optimzied key table. Each formed sessions have resistance against deprivation of individual confirmation and service authority. Suggested confirmation technique that uses these features is expected to provide safe computing service in clouding environment.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.235-238
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• 2016

With the vision of Internet of Things (IoT), physical world itself is becoming a connected information system on the Internet and cyber world is computing as a physical act to sense and respond to real-world events collaboratively. The systems that tightly interlink the cyber and physical worlds are often referred to as Smart Systems or Cyber-Physical Systems. Smart IoT Clouds aim to provide a cyber-physical infrastructure for utility (pay-as-you-go) computing to easily and rapidly build, modify and provision auto-scale smart systems that continuously monitor and collect data about real-world events and automatically control their environment. Developing specifications for service interoperability is critical to enable to achieve this vision. In this paper, we bring an issue to extend Open Cloud Computing Interface for uniform, interoperable interfaces for Smart IoT Cloud Services to access services and build a smart system through orchestrating the cloud services.

• 산업경영시스템학회지
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• 제38권2호
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• pp.91-100
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• 2015

In this study, we propose an efficient two-phase heuristic policy, called an acceptance tolerance control policy, for Infrastructure as a Service (IaaS) cloud services that considers both the service provider and customer in terms of profit and satisfaction, respectively. Each time an IaaS cloud service is requested, this policy determines whether the service is accepted or rejected by calculating the potential for realizing the two performance objectives. Moreover, it uses acceptance tolerance to identify the possibility for error with the chosen decision while compensating for both future fluctuations in customer demand and error possibilities based on past decisions. We conducted a numerical experiment to verify the performance of the proposed policy using several actual IaaS cloud service specifications and comparing it with other heuristics.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2014년도 추계학술발표대회
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• pp.26-29
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• 2014

가상 데스크탑 서비스 사용자는 데스크탑이나 다양한 모바일 기기를 이용해 할당 받은 계정으로 인증하고 로그인하면 언제 어디서든 인터넷용 가상화 PC 또는 업무용 가상화 PC 를 자신만의 가상 데스크탑처럼 사용할 수 있다. 이러한 가상 데스크탑 서비스가 대중화됨에 따라 라이선스 및 구축 비용, 서비스의 최적화와 같은 사항을 만족시키는 대규모 플랫폼 가상화 기술이 요구된다. 본 논문에서는 클라우드 인프라 상에서 가상 플랫폼을 대규모의 모바일 및 경량 단말 사용자에게 네트워크를 통해 끊김없이 전송하는 빅 가상 플랫폼 인프라 시스템을 설계 및 구현한다.