• 사물인터넷융복합논문지
• /
• 제6권3호
• /
• pp.39-44
• /
• 2020

본 논문은 SDN 기반 네트워크에서 fog computing 서비스의 이동성을 제안하고자 한다. Fog computing 아키텍처는 컴퓨팅 및 배터리 자원의 제약이 있는 IoT(Internet of Things) 기기들에게 테스크 오프로딩을 가능하게 함으로써 IoT의 저지연/고성능 서비스를 위한 방안으로 연구되고 있다. 하지만 fog computing 아키텍처에서는 고정된 IoT 기기 뿐만 아니라 이동하는 IoT 기기도 서비스 대상 단말로 고려되어야 하기 때문에 이러한 기기의 이동성을 고려한 오프로딩 방안이 필요하다. 특히 저지연 응답 시간을 요구하는 IoT 서비스의 경우, 오프로딩 이후 단말이 이동했을 때 새로운 fog computing 노드와의 새로운 통신 연결 및 테스크 오프로딩 과정을 다시 수행해야 하기 때문에 지연시간이 발생하여 사용자의 QoS(Quality of Service) 저하가 발생할 수 있다. 그러므로 본 연구에서는 단말의 이동성을 고려하여 테스크 또는 테스크의 결과를 이동 후의 fog computing 노드로 미리 migration 시키고 데이터 전송을 위한 rule 또한 미리 배치시킴으로써 통신 지연 및 서비스 복구 지연 시간을 줄일 수 있는 방안을 제시하고자 한다.

• 디지털콘텐츠학회 논문지
• /
• 제12권3호
• /
• pp.319-327
• /
• 2011

클라우드 컴퓨팅은 인터넷상에 기업이나 소비자들에게 IT서비스를 제공하기 위한 유연하고 비용 효과적인 검증된 전송 플랫폼으로, 계산이나 데이터가 데스크탑이나 포터블 PC로부터 대규모 데이터센터로 이동하는 계기가 되었다. 이와 같은 클라우드 컴퓨팅 서비스의 활성화를 위해서는 현재 제공되거나 향후 제공될 서비스가 현재와 미래의 고객을 만족시키기 위해 개선되어야 할 서비스 품질요건에 대한 분석이 필수적이다. 본 연구는 클라우드 서비스 환경에서 서비스품질 규명을 위한 연구의 일환으로서, 탐색적 방법을 사용하여 기존 다양한 문헌을 분석하였으며, 이로부터 7가지의 클라우드 컴퓨팅의 서비스 특성과 세부속성들을 정의하였다.

• 경영과학
• /
• 제28권1호
• /
• pp.11-24
• /
• 2011

In this paper, we develop a new conceptual framework for finding new business opportunities in the cloud computing environment. We propose a service model framework for cloud computing business. In the service concept of the proposed business model, we categorize customer needs and service offering value, while we analyze customer behavior for developing revenue model. In addition, we analyze cloud computing market drivers for finding an evolution path of the proposed business model. Finally, we develop cloud computing business strategies for Korean IT service industry.

• 한국IT서비스학회지
• /
• 제11권2호
• /
• pp.107-118
• /
• 2012

Recently, as the clouding computing begins to receive a great attention from people all over the world, it became the most popular buzz word in recent IT magazines or journal and heard it in many different services or different fields. However, a notion of the cloud service is defined vaguely compared to increasing attentions from others. Generally the cloud service could be understood as a specific service model base on the clouding computing, but the cloud, the cloud computing, the cloud computing service and cloud service, these four all terms are often used without any distinction of its notions and characteristics so that it's difficult to define the exact nature of the cloud service. To explore and analyze the cloud service systematically, an accurate conception and scope have to be preceded. Therefore this study is to firstly clarify its definition by Delpi method using expert group and then tries to provide the foundation needed to enable relative research such as establishing business model or value chain and policies for its activation to set off. For the Delpi, 16 experts participated in several surveys from different fields such industry, academy and research sector. As a result of the research, Characteristics of the Cloud Service are followings : Pay per use, Scalability, Internet centric Virtualization. And the scope as defined including Grid Computing, Utility Computing, Server Based Computing, Network Computing.

• 한국도서관정보학회지
• /
• 제43권1호
• /
• pp.241-259
• /
• 2012

본 연구의 목적은 최근 다양한 산업분야에서 도입되고 있는 클라우드 컴퓨팅서비스의 관련 문헌을 조사하여 개념과 유형, 적용 사례를 포괄적으로 분석한 후, 도서관 사서들을 대상으로 클라우드 컴퓨팅서비스에 대한 인식을 설문조사하여 그 결과를 기반으로 도서관에서 클라우드 컴퓨팅서비스를 적용할 때의 장점과 문제점, 적용에 적합한 도서관 업무 분야를 사서들의 설문 내용에 근거하여 도출하고, 클라우드 컴퓨팅서비스의 도서관 적용에서 핵심적으로 고려할 사항들을 제안하였다.

• 한국IT서비스학회지
• /
• 제11권3호
• /
• pp.129-159
• /
• 2012

Cloud-computing is in the limelight with expectation for cost reduction, because it alleviates the burden of initial investment and maintenance cost and based on pay-as-you-use billing policy. However, many suppliers of Cloud-computing service are suggesting diverse and complicated billing policies without consideration for setting reasonable service billing policy and definite criteria of properties to determine service billing system. So companies willing to use Cloud-computing service are hard to understand the billing system and often spend more expensive cost than necessary. Therefore, this study invested billing system properties of four representative suppliers. Based on these properties of billing system, this study found priorities using AHP survey which conducted to experts who are able to make decisions for adopting Cloud-computing in the company using or willing to use Cloud-computing service. We expect that this study can suggest basic guideline for comparing and analyzing properties of Cloud-computing service with standardized and objective method.

• 대한인간공학회지
• /
• 제24권1호
• /
• pp.43-46
• /
• 2005

The future information technologies and service paradigm will move from PC, the general purpose desktop computing environment, to the next-generation PC that provides information any where, any time, and any device. The next-generation PC such as wearable computers are specialized to the human-centric functionalities and always-on connected services. In this study, service infrastructure of wearable computing with WBAN(Wearable Body Area Network) was suggested for the ubiquitous computing environment.

• 한국IT서비스학회지
• /
• 제9권3호
• /
• pp.163-178
• /
• 2010

A service composition has received much interest to provide users with the ad-hoc, seamless, and context-sensitive services dynamically composed from various networked services in context-aware computing environments. In this paper, with the purpose of guiding trends in the researches for dynamic service composition technologies, we investigate and analyze the major related works. For this, we separate semantic based composition from syntax based composition and then establish the comparison criteria by dividing the service composition processes into 3 steps：definition, construction, and execution.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제17권11호
• /
• pp.3030-3049
• /
• 2023

With the development and wide application of hybrid network computing modes like cloud computing, edge computing and fog computing, the customer service requests and the collaborative optimization of various computing resources face huge challenges. Considering the characteristics of network environment resources, the optimized deployment of service resources is a feasible solution. So, in this paper, the optimal goals for deploying service resources are customer experience and service cost. The focus is on the system impact of deploying services on load, fault tolerance, service cost, and quality of service (QoS). Therefore, the alternate node filtering algorithm (ANF) and the adjustment factor of cost matrix are proposed in this paper to enhance the system service performance without changing the minimum total service cost, and corresponding theoretical proof has been provided. In addition, for improving the fault tolerance of system, the alternate node preference factor and algorithm (ANP) are presented, which can effectively reduce the probability of data copy loss, based on which an improved cost-efficient replica deployment strategy named ICERD is given. Finally, by simulating the random occurrence of cloud node failures in the experiments and comparing the ICERD strategy with representative strategies, it has been validated that the ICERD strategy proposed in this paper not only effectively reduces customer access latency, meets customers' QoS requests, and improves system service quality, but also maintains the load balancing of the entire system, reduces service cost, enhances system fault tolerance, which further confirm the effectiveness and reliability of the ICERD strategy.

• 한국IT서비스학회지
• /
• 제11권1호
• /
• pp.173-196
• /
• 2012

Cloud computing is provided on demand service via the internet, allowing users to pay for the service they actually use. Since cloud computing is emerging stage in industry, many companies and government consider adopting the cloud computing. Actually a variety of factors may influence on the adopting decision making of cloud computing. The objective of this study is to explore the significant factors affecting the adoption decision of enterprise cloud computing. A research model has been suggested based on TOE framework and outsourcing decision framework. Based on 302 data collected from managers in various industries, the major findings are following. First, the benefit factors of cloud computing service such as agility and cost reduction have direct and positive effects on adoption of the service. Second, lock-in as a risk factor of cloud computing service has a negative effect while security has not. Third, both internal and external environment factors have positive effects on adoption of the service.