• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권1호
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• pp.340-367
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• 2018

Storage services integration can be done for achieving high availability, improving data access performance and scalability while preventing vendor lock-in. However, multiple services environment management and interoperability have become a critical issue as a result of service architectures and communication interfaces heterogeneity. Storage federation model provides the integration of multiple heterogeneous and self-sufficient storage systems with a single control point and automated decision making about data distribution. In order to integrate diverse heterogeneous storage services into a single storage pool, we are proposing a storage service federation framework named BoxBroker. Moreover, an automated decision model based on a policy-driven data distribution algorithm and a service evaluation method is proposed enabling BoxBroker to make optimal decisions. Finally, a demonstration of our proposal capabilities is presented and discussed.

• International journal of advanced smart convergence
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• 제9권3호
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• pp.183-191
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• 2020

Today, taking photos using smartphones has become an essential element of modern people. According to these social changes, modern people need a larger storage capacity, and the number of unnecessary photos has increased. To support the storage, cloud-based photo storage services from various platforms have appeared, and many people are using the services. As the number of photos increases, it is difficult for users to find the photos they want, and it takes a lot of time to organize. In this paper, we propose a cloud-based photo management service that facilitates photo management by classifying photos and recommending unnecessary photos using deep learning. The service provides the function of tagging photos by identifying what the subject is, the function of checking for wrongly taken photos, and the function of recommending similar photos. By using the proposed service, users can easily manage photos and use storage capacity efficiently.

• 한국식품조리과학회지
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• 제23권4호통권100호
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• pp.502-510
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• 2007

This study investigated the utilization of turmeric (Curcuma aromatica Salab.) for tofu manufacture and its effects on the quality characteristics and shelf-life. Various concentration (0.000%, 0.005%, 0.010%, and 0.015%) of turmeric were used to evaluate the shelf-life during tofu storage for 12 days at $10^{\circ}C$. The pH decreased with an increasing storage period, but the 0.010% and 0.015% tofu showed lower pH value than the 0.000% tofu, the acidity decreased with an increasing storage period. The water content of the turmeric tofu decreased with an increasing storage period. The turbidity gradually increased until 6 days of storage, and then rapidly increased at 12 days of storage. The microbial count of the 0.015% tofu was lowest during the storage period. In measuring the turmeric tofu color, the L- and a--values decreased during the storage period, while the b--value increased. In the texture analysis, hardness, gumminess, and brittleness of the turmeric tofu decreased 12 days of storage. Cohesiveness and springiness increased with an increasing storage period. In the sensory evaluation, Smoothness, after taste, and overall taste were highest for the 0.010% tofu. For the overall acceptability, the 0.010% tofu (with 0.45% mixed coagulant) attained the highest score.

• 품질경영학회지
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• 제41권3호
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• pp.381-394
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• 2013

Purpose: Nowadays, Mobile Cloud Storage services are used widely. For sustainable use of this service, we need to determine what factors affect satisfaction. Therefore, the purpose of this study is to identify the factors that influence satisfaction. Methods: To analyze factors that influence satisfaction, this study sets the factors into three dimensions such as service quality, perceived risk, and individual characteristics and analyze the causal relationship between influence factors and satisfaction through Structural Equation Model. Results: The results of this study are as follows; among service quality, user interface and reliability influenced satisfaction, but adaptability did not have any influence. Perceived risk of illegal access had a negative influence on satisfaction, while perceived risk of privacy leakage did not have significant influence on satisfaction in perceived risk. At last, self-efficacy had a significant influence on satisfaction. Conclusion: We identified the influence factors that influence satisfaction. Our findings will be necessary for Mobile Cloud Storage service providers to strengthen their service.

• 기술혁신연구
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• 제23권1호
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• pp.1-36
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• 2015

본 논문에서는 Daum클라우드, 네이버 N드라이브, 구글드라이브, 드롭박스, 마이크로소프트 SkyDrive, 애플 iCloud와 같은 클라우드 스토리지 서비스 기술혁신에 있어서의 각 속성에 대한 개인 사용자의 선호요인을 컨조인트 방법론으로 분석하였다. 기존 연구 문헌을 통해서 클라우드 스토리지 서비스를 구성하는 주요한 속성으로 무료저장용량, 인지된 비용, 파일공유 기능을 통한 협업성 여부, 모바일 접근성, 사회적 영향력, 신뢰성을 기반으로 한 인지된 보안의 6가지를 요소를 추출하였다. 또한 컨조인트 분석 결과 6가지 속성 모두 클라우드 스토리지 서비스 선호에 통계적으로 유의함을 확인할 수 있었다. 컨조인트 분석결과 가장 중요한 속성은 접근성 이었으며, 그 다음으로 중요한 속성은 무료저장용량과 협업성 이었다. 그 결과로부터 더 진일보된 기술 혁신을 위한 클라우드 스토리지 서비스 생태계 조성을 위해 각 회사의 서비스 간 상호호환성에 기반한 통합적인 클라우드 스토리지 서비스 제공이 중요할 것이라는 함의를 찾을 수 있었다. 본 논문의 방법론에서 접근성과 협업성을 경제적 카테고리로 묶고, 저장용량과 인지된 비용을 기술적 카테고리로, 사회적 영향력과 인지된 보안을 환경적 카테고리로 분류하였을때, 기술적인 부분이 가장 중요하게, 그 다음으로 경제적인 부분이, 그리고 그 뒤로 환경적인 요인이 중요하다는 결과가 나왔다. 시사점에서는 연구 결과를 바탕으로 현재의 클라우드 스토리지 서비스를 더욱 개선, 발전시킬 수 있는 사항들을 제안해 보았다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.89-92
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• 1996

It is generally recognized that Video On Demand (VOD) service will become a promising interactive service in B-ISDN. We consider a hierarchical two level network architecture for VOD service. The first level consists of connected Local Video Servers(LVSs) in which a limited number of high vision programs are stored. The second level has one Central Video Server(CVS) containing all the programs served in the network. The purpose of this paper is to analyze the network traffic and to propose the storage policy for LVSs. For this purpose, we present an analysis of program storage amount in each LVS, transmission traffic volume between LVSs, and link traffic volume between CVS and LVSs, according to changing the related factors such as demand, the number of LVSs is also presented on the basis of the tradeoffs among program storage cost, link traffic cost, and transmission cost.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권3호
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• pp.1523-1545
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• 2019

Cloud computing is now a widespread and economical option when data owners need to outsource or share their data. Designing secure and efficient data access control mechanism is one of the most challenging issues in cloud storage service. Anonymous broadcast encryption is a promising solution for its advantages in the respects of computation cost and communication overload. We bring forward an efficient anonymous identity-based broadcast encryption construction combined its application to the data access control mechanism in cloud storage service. The lengths for public parameters, user private key and ciphertext in the proposed scheme are all constant. Compared with the existing schemes, in terms of encrypting and decrypting computation cost, the construction of our scheme is more efficient. Furthermore, the proposed scheme is proved to achieve adaptive security against chosen-ciphertext attack adversaries in the standard model. Therefore, the proposed scheme is feasible for the system of data access control in cloud storage service.

• 대한산업공학회지
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• 제18권2호
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• pp.23-29
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• 1992

To compute the expected travel time of storage and retrieval (S/R) machine in automated warehousing systems most of the previous studies assumed that equal number of rack openings are required regardless of the nature of storage assignment rules. It is known that randomized storage assignment rule usually needs less storage to space than needed for full turnover-based assignment rule. The objective of this paper is compute the expected travel time of each assignment rule more equitably by taking into account the storage space required for each rule. First, the rack storage space is determined which satisfies a given service level. Then based on the standard Economic Ordering Quantity model, trade-off analysis is carried out which relates the storage space to the expected travel time of the S/R machine. Finally, example problems are solved to compare the performance of each assignment rule under varying conditions of demand pattern and service level.

• 인터넷정보학회논문지
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• 제17권2호
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• pp.1-9
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• 2016

클라우드 컴퓨팅 환경에서 사용자는 중앙처리장치, 메모리, 네트워크, 저장 장치 등과 같은 인프라를 IaaS(Infrastructure as a Service) 서비스로 제공받을 수 있다. 저장 장치의 경우 서비스 제공자가 제공하는 물리적인 자원들의 인스턴스가 제공하는 저장 용량이 제한되어 있으므로, SQL 서버가 사용할 수 있는 최대 저장 용량을 지원할 수 없다. 본 논문에서는 한정된 용량을 가진 인스턴스들의 네트워크 디스크를 공유하여 SQL 서버에서 사용할 수 있는 대용량의 저장소를 확보하기 위한 방법을 제안한다. 실험을 통해 아마존 EC2 윈도우즈 환경에서 아마존 EBS 볼륨을 사용하는 하나의 인스턴스가 사용할 수 있는 최대 저장 용량을 초과하는 대용량 저장 공간을 확보할 수 있으며, SQL Server를 운영하는 아마존 클라우드 환경에서 디스크 용량 및 성능을 증가시켜 전체적인 SQL Server의 성능을 향상시킬 수 있음을 확인하였다.

• 한국전자거래학회지
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• 제19권1호
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• pp.15-42
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• 2014

클라우드 스토리지 서비스는 미래 모바일 및 인터넷 서비스의 핵심적인 인프라 서비스가 될 가능성이 높다. 클라우드 스토리지 서비스와 관련된 많은 기업들은 지속적인 투자를 하고 있으며, 가입자 확보를 위해 노력하고 있다. 이러한 서비스를 제공하는 기업들이 신규 가입자를 확보하고 기존 가입자를 유지하기 위해 사용자들의 서비스 사용의도가 무엇인지 확인할 필요가 있다. 따라서 본 연구에서는 클라우드 스토리지 서비스의 지속적 사용의도에 대한 실증적 연구 수행을 위해 외생 변수를 추가한 확장된 TAM 모형을 기반으로 사용자 수용의도와의 관계를 규명하고자 한다. 연구 결과, 개인의 혁신성, 자기효능감, 기능적 속성, 심리적 전환 비용과 같은 요인이 클라우드 스토리지 서비스의 지속적 사용의도에 영향을 주는 것으로 검증되었으며, 향후 클라우드 스토리지 서비스를 제공하는 기업들의 전략 수립을 위한 방향성을 제공해 줄 수 있을 것으로 기대한다.