• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.324-327
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• 2013

Recently, due to evolving cloud computing technology, we can easily and transparently utilize both local computing resource and remote computing resource in real life. Especially, enhancing smart device technologies and network infrastructures promote an increase of needs to share files between local smart devices and cloud storages. However, since smart devices have a limited storage space, storing files on cloud storage causes a starvation problem of local storage. It means that users can face a storage-lack problem even a cloud storage service provide a huge file storing space. In this research, we propose a method to manage files between smart devices and cloud storages. Our approach calculate file usage pattern based on recently used date, and then this approach determines local files being migrated. As a result, our approach is sufficient for handling data synchronization between big data storage farm and local thin client which contains limited storage space.

• Journal of Korean Society of Archives and Records Management
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• v.19 no.3
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• pp.271-292
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• 2019

Recently, the central administrative agency changed its business management system to cloud-based On-nara 2.0. To transfer and manage the records of the cloud business management system, the National Archives Service has developed and distributed a cloud-based records management system. It serves as an opportunity to maximize the benefits of cloud computing and redesign the records management to be more effective and efficient. The process and method of electronic record management can be transformed through digital technologies. First, we can change the transfer method for electronic records. When the business and the records management systems share the same cloud storage, it is possible to transfer the content files between the two systems without moving the contents files physically, thus copying only the metadata and reducing the cost and the risk of integrity damage. Second, the strategy for allocating storage space for contents can be conceived. Assuming that the cloud storage is shared by the business and the record management systems, it is advantageous to distinguish the storage location based on the retention period of the content files. Third, systems that access content files, such as records creation, records management, and information disclosure systems, can share the cloud storage and minimize the duplication of content files.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.195-196
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• 2020

본 논문에서는 클라우드 저장소의 민감한 데이터를 보호하기 위해 제시된 암호화 알고리즘을 이용하여 텍스트 데이터를 암호화하고 처리 속도에 대한 성능을 측정하여 기존의 방식과 비교·분석하였다. 클라우드 데이터는 사용자 로그인 정보 탈취나 SSL Strip 공격에 취약하기 때문에 이러한 보안 사고의 피해를 최소화하기 위해 데이터 암호화를 통한 데이터의 보안이 요구된다. 본 논문에서는 클라우드 전송을 위해 구글 드라이브 API를 연동했으며, 암호화 알고리즘을 텍스트에 적용하기 위해 Python 언어를 이용하여 데이터를 암호화하고 구글 드라이브에 전송하는 테스트 프로그램을 제작하여 프로젝트를 진행하였다.

• Journal of Korean Society of Archives and Records Management
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• v.19 no.2
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• pp.1-24
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• 2019

In this study, we propose a logical transfer method of records using cloud storage to solve the integrity problem of digital component, which is generated when electronic records are transferred from the electronic record production system to the record management system. This method, which produces electronic records using cloud storage from the production stage and transfers them to the archives, has the following advantages. First, as a record management method, it can be effectively applied in public institutions by utilizing cloud computing technology, which has been the trend recently. Second, unlike the existing method of copying and physically transferring electronic records, the proposed method can reduce various risk factors that may occur in the transfer of electronic records by logically transferring the storage. Third, the method can prevent errors of the digital component according to the physical transfer of the electronic record; hence, the integrity of the electronic record can be guaranteed. Fourth, administrative power and cost that are wasted because of the electronic transfer of electronic records can be reduced.

• The Journal of the Korea Contents Association
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• v.13 no.8
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• pp.28-35
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• 2013

Recently, cloud data management has been actively studied along with the development of a cloud computing technology that can process large amounts of data at a lower cost. However, the existing cloud computing platforms do not guarantee interoperability according to the construction environments of users because they do not provide technical and political openness. In other words, in order for users to receive the related services, they use services provided by only one vendor. In this paper, we design and implement a storage interface that supports the international standard CDMI in order to retrieve, update, and delete data in could environments. These interfaces provide the functionality required for developers who want to build and use the cloud storage without special restrictions. In addition, we verify the operability and usability of CDMI international standard through the implementation of the proposed system.

• Journal of Korean Library and Information Science Society
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• v.47 no.1
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• pp.149-173
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• 2016

As cloud computing becomes more and more popular and ubiquitous, many organizations are deciding to move their whole information infrastructure to the cloud. The healthcare industry is one of those that is beginning to utilize cloud-based solutions en masse. Cloud based computing and storage offers numerous benefits including scalability, cost efficiency, and accessibility, which in turn have the potential to streamline hospital operations. Despite the potential benefits of acquiring this system, considerations must still be given to the migration of the massive amounts of personal and highly protected data to a cloud-based solution. Health care organizations must consider all matters of security, reliability, and availability, to ensure that patients' data remains compliant to the Health Insurance Portability and Accountability Act (HIPAA) compliant. This paper will examine the benefits and challenges of such operation to determine the best practices for the utilization of Electronic Medical Record (EMR) cloud based networking and storage for small to mid-sized hospitals.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.1576-1579
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• 2013

클라우드 저장소 서비스는 특정한 장비나 저장 공간의 제약 사항 없이, 언제 어디서나 신뢰성 높은 서버를 활용하여 사용자들에게 다양한 편의를 제공함으로써 사용량이 급증하고 있다. 더불어, 저장 데이터 요청 빈도, 저장 데이터의 크기, 파일 구조 복잡도의 증가로 인해 오버헤드의 발생에 따른 성능 하락에 관한 이슈가 제기된다. 본 논문에서는 클라우드 백업 애플리케이션의 성능 향상을 위해 컴포지트 패턴 기반의 백업 데이터 관리 기법과 동적 자원 할당 기법으로 구성된 설계 모델을 제안한다. 또한, 실사례의 적용을 통해 본 논문에서 제안하는 설계 모델의 실효성을 검증한다.

• Journal of the Korea Society for Simulation
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• v.24 no.3
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• pp.77-87
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• 2015

Defense M&S (Modeling & Simulation) is utilized as a realistic method to analyze MOE (Measure of Effectiveness) of weapon systems by modeling weapons and their operational environment on the computer, and simulating them under various war scenarios. As weapon systems become complex in their structure and dynamics, model engineering are experiencing difficulties to construct simulation models on a computer. A model repository helps model developers to save model development time and cost by systematically storing predefined and already validated models. However, most repositories for Defense M&Shave not been successful partly due to limited accessability, vulnerability to security threats, and low level of dependability. In this paper, we propose W-Cloud (Weapon Cloud), a cloud model repository for reusing predefined weapon models. Clients can access W-Cloud on any platforms and various devices, yet security and confidentiality concerns are guaranteed by employing multi-tier information protection mechanism.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.297-298
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• 2013

클라우드 컴퓨팅 산업의 발달로 클라우드 데이터를 관리하기 위한 연구들이 활발하게 진행되고 있다. 그러나 현재 연구되고 있는 다양한 형태의 클라우드 컴퓨팅 플랫폼들은 기술적, 정책적으로 개방성을 띄지 않아 사용자의 구축 환경에 따른 상호 운용성을 보장하지 못한다. 본 논문에서는 클라우드 환경에서 데이터 생성, 검색, 갱신, 삭제하기 위해 CDMI 국제 표준을 준수하는 저장소 인터페이스를 설계하고 구현한다. 이러한 인터페이스는 특별한 제약없이 클라우드 저장소를 구축하거나 사용하려는 개발자에게 필요한 기능을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.984-986
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• 2012

디지털 정보량의 증가 추세에 맞추어 네트워크를 통해 자신의 데이터를 원격 저장소에 저장하고, 이를 다양한 디바이스를 통해 언제 어디서나 접근할 수 있는 클라우드스토리지 서비스가 등장하게 되었다. 이는 기존에 데이터를 휴대하기 위해 사용되던 이동식 저장매체와 달리 저장용량의 크기 제한이 없고, 저장매체를 소지해야 하는 문제점이 없어 많은 사용자로부터 사용되고 있다. 이러한 클라우드 스토리지에 여러 사용자의 데이터가 저장됨에 따라 클라우드 스토리지의 신뢰성 문제가 이슈화 되고 있다. 비윤리적인 관리자 및 공격자로부터 클라우드에 저장된 데이터를 안전하게 보호하기 위해 다양한 암호 기술을 클라우드 스토리지에 적용하려는 연구가 진행되고 있다. 하지만 기존의 검색가능 암호기술은 사용자가 저장하고자 하는 데이터를 직접 업로드하고, 해당 자료를 필요에 따라 공유 하고, 공유대상이 변화되는 클라우드 스토리지 환경에서 비효율성을 가지고 있어 실제 서비스에 적용하기 힘든 단점을 가지고 있다. 따라서 본 논문에서는 클라우드 컴퓨팅 환경을 고려하여 검색 가능한 암호화 색인 생성 및 이를 재암호화해 다른 사용자와 안전하게 공유할 수 있는 색인 관리 기법을 제안한다.