• Journal of the Korean BIBLIA Society for library and Information Science
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• v.33 no.1
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• pp.321-343
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• 2022

This study presents the direction of services and policies for digital file management in universities by identifying undergraduate students' digital file management behavior. The research defined the Life Cycle of Digital Objects. In addition, This research collected data from 154 undergraduate students using an online survey on their file Creation, Storing, Naming, Organizing, and Backup based on the Digital File Management Workflow. Also, an in-depth interview was conducted for 8 students, two for each major in engineering, arts, social science, and humanities. The result showed that students mostly used personal computers as storage media and USB drive as backup media and had their own file Naming and Organizing methods. Furthermore, students' satisfaction with digital file management was high when universities supported software and cloud storage. Therefore, this study suggests that universities need to provide services reflecting the students' digital file management behavior.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.5
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• pp.1014-1035
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• 2013

With recent advances in wireless communication and low-power miniaturized biomedical sensor and semiconductor technologies, wireless body area networks (WBAN) has become an integral part of the disaster aid system. Wearable vital sign sensors can track patients' status and location, thus enhancing disaster rescue efficiency. In the past few years, most of the literatures in the area of disaster aid system based on WBAN have focused on issues concerning wireless sensor design, sensor miniaturization, energy efficiency and communication protocols. In this paper, we will give an overview of disaster aid, discuss about the types of network communication as well as outline related issues. We will emphasize on analyzing six key issues in employing the disaster aid system. Finally, we will also highlight some of the challenges that still need to be addressed in the future in order to help the disaster aid system be truly and widely accepted by the public.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.2
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• pp.786-799
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• 2018

Recently, NFV has attracted attention as a next-generation network virtualization technology for hardware -independent and efficient utilization of resources. NFV is a technology that not only virtualize computing, server, storage, network resources based on cloud computing but also connect Multi-Tenant of VNFs, a software network function. Therefore, it is possible to reduce the cost for constructing a physical network and to construct a logical network quickly by using NFV. However, in NFV, when a new VNF is added to a running Tenant, authentication between VNFs is not performed. Because of this problem, it is impossible to identify the presence of Fake-VNF in the tenant. Such a problem can cause an access from malicious attacker to one of VNFs in tenant as well as other VNFs in the tenant, disabling the NFV environment. In this paper, we propose Auto-configurable Security Mechanism in NFV including authentication between tenant-internal VNFs, and enforcement mechanism of security policy for traffic control between VNFs. This proposal not only authenticate identification of VNF when the VNF is registered, but also apply the security policy automatically to prevent malicious behavior in the tenant. Therefore, we can establish an independent communication channel for VNFs and guarantee a secure NFV environment.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.266-269
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• 2017

최근, 기업 및 사용자들은 클라우드 서비스의 필요성에 대한 인식이 확산되고 있다. 반면에 클라우드 보안 기술에 대한 관심의 부재는 클라우드 서비스를 도입하는데 어려움으로 작용하고 있다. 클라우드 컴퓨팅 환경에서는 기존의 컴퓨터 네트워크 환경과 다르게 서버 가상화, 네트워크 가상화, 스토리지 가상화와 같은 부분들이 가상화되어 서비스 및 자원을 공유하여 활용한다. 따라서 가상화 기반 취약점이 발생할 수 있으며 기존 보안장비의 한계점으로 인한 새로운 보안위협이 발생하고 있다. 특히, 방대한 양의 데이터를 클라우드 컴퓨팅 중 하나인 클라우드 스토리지를 통해 저장을 하게 되고 이러한 데이터를 겨냥한 공격이 이루어질 경우, 데이터 손실 및 유출 등 심각한 위험이 발생할 수 있다. 본 논문에서는 클라우드 스토리지 환경에서 문제점들에 대한 대응을 위해 ISO/IEC에서 제시한 스토리지 보안위협과 ITU-T, ENISA, CSA에서 제시한 클라우드 컴퓨팅 보안위협을 이용하여 클라우드 스토리지 관련 보안위협 유형 분석을 수행하고 이에 대응하는 보안 아키텍처를 설계하며 이에 대한 안전성 분석을 수행한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.10
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• pp.5100-5119
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• 2018

Most of existing privacy-preserving multi-authorities attribute-based encryption schemes (PP-MA-ABE) only considers the privacy of the user identity (ID). However, in many occasions information leakage is caused by the disclosing of his/her some sensitive attributes. In this paper, we propose a collusion-resisting ciphertext-policy PP-MA-ABE (CRPP-MACP-ABE) scheme with hiding both user's ID and attributes in the cloud storage system. We present a method to depict anonymous users and introduce a managerial role denoted by IDM for the management of user's anonymous identity certificate ($AID_{Cred}$). The scheme uses $AID_{Cred}$ to realize privacy-preserving of the user, namely, by verifying which attribute authorities (AAs) obtain the blinded public attribute keys, pseudonyms involved in the $AID_{Cred}$ and then distributes corresponding private keys for the user. We use different pseudonyms of the user to resist the collusion attack launched by viciousAAs. In addition, we utilize IDM to cooperate with multiple authorities in producing consistent private key for the user to avoid the collusion attack launched by vicious users. The proposed CRPP-MACP-ABE scheme is proved secure. Some computation and communication costs in our scheme are finished in preparation phase (i.e. user registration). Compared with the existing schemes, our scheme is more efficient.

• KIPS Transactions on Computer and Communication Systems
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• v.4 no.7
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• pp.227-234
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• 2015

USN-based real-time monitoring systems, which receive raw data from sensor nodes and store the processed information in traditional servers, recently get to be replaced by IoT(Internet of Things)/WoT(Web of Things)-based ones. Especially, Social Web of Things(SWoT) paradigm can make use of cloud storage over Social Network Service(SNS) and enable the possibility of integrated access, management and sharing. This paper proposes an improved SWoT-based real-time monitoring system which makes up for weak points of existing systems, and implements monitoring service integrating a legacy sensor network and commercial SNS without requiring additional servers. Especially, the proposed system can reduce emergency propagation time by employing PUSH messages.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.11
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• pp.5271-5289
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• 2016

On large-scale data analysis platforms deployed on cloud infrastructures over the Internet, the instability of the data transfer time and the dynamics of the processing rate require a more sophisticated data distribution scheme which maximizes parallel efficiency by achieving the balanced load among participated computing elements and by eliminating the idle time of each computing element. In particular, under the constraints that have the real-time and limited data buffer (in-memory storage) are given, it needs more controllable mechanism to prevent both the overflow and the underflow of the finite buffer. In this paper, we propose an auto regulated data provisioning model based on receiver-driven data pull model. On this model, we provide a synchronized data replenishment mechanism that implicitly avoids the data buffer overflow as well as explicitly regulates the data buffer underflow by adequately adjusting the buffer resilience. To estimate the optimal size of buffer resilience, we exploits an adaptive buffer resilience control scheme that minimizes both data buffer space and idle time of the processing elements based on directly measured sample path analysis. The simulation results show that the proposed scheme provides allowable approximation compared to the numerical results. Also, it is suitably efficient to apply for such a dynamic environment that cannot postulate the stochastic characteristic for the data transfer time, the data processing rate, or even an environment where the fluctuation of the both is presented.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.11
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• pp.5243-5263
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• 2017

Data center networks provide critical bandwidth for the continuous growth of cloud computing, multimedia storage, data analysis and other businesses. The problem of low link bandwidth utilization in data center network is gradually addressed in more hot fields. However, the current scheduling strategies applied in data center network do not adapt to the real-time dynamic change of the traffic in the network. Thus, they fail to distribute resources due to the lack of intelligent management. In this paper, we present an improved adaptive traffic scheduling strategy utilizing the simulated annealing genetic algorithm (SAGA). Inspired by the idea of software defined network, when a flow arrives, our strategy changes the bandwidth demand dynamically to filter out the flow. Then, SAGA distributes the path for the flow by considering the scheduling of the different pods as well as the same pod. It is implemented through software defined network technology. Simulation results show that the bisection bandwidth of our strategy is higher than state-of-the-art mechanisms.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.2
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• pp.1420-1425
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• 2015

Lately, information and communications environmentis in accordance with the smartphone release is changing the paradigm of working environments setting a high value on mobility and efficiency as well as the ecosystem of information and communication technologies. In this paper, we proposed smart work-based IT system modeling suitable for SMEs in order to transform the paradigm of working environments, strengthen the competitiveness of SMEs, and to establish a foundation on which SMEs could leap to the global economy, by fostering the acceleration of information service implementation and smart work foundation. We conducted a survey of the change in awareness and creation of smart work environment targeting companies with less than thirty workers and proved it. will also contribute to smart work diffusion in SMEs by drawing a positive result of more than 75%.

• 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.