• Information and Communications Magazine
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• v.30 no.4
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• pp.23-28
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• 2013

개념적으로 존재하던 클라우드 컴퓨팅의 사용이 본격적으로 심화되면서 기업들의 클라우드 컴퓨팅에 대한 개념과 생각에도 많은 변화가 생기게 되었다. 클라우드 컴퓨팅 구축이 더욱 가속화되는 가운데, 그로 인한 비용절감이나 투자수익 창출 효과에 대한 검증이 활발해질 것으로 예측됐다. 시대를 뒤바꾸는 혁신적인 기술도 잇달아 등장할 것이란 기대도 높다. 2013년은 클라우드 컴퓨팅의 발전에 또 한번의 변곡점이 될 것으로 전망된다. 본 고에서는 2013년 클라우드 컴퓨팅에 관한 예측 몇 가지를 살펴보고자 한다. 첫째, 중소기업에서의 클라우드 컴퓨팅 사용 및 정착이 가속화될 것으로 보인다. 대기업의 경우에는 기존에 구축되어 있는 IT 시스템에 대한 거버넌스 체계를 완성해 나가고 있는 상황 속에서 중앙집중형과 사용자 편의성이 강화된 클라우드 컴퓨팅을 도입하기 위해서는 아직 추구 해야 할 과제가 많다. 하지만 중소기업은 예산을 문제로 대기업과 같은 수준의 IT 인프라를 갖추지 못하고 있기 때문에 클라우드 컴퓨팅 도입으로 비용대비 고효율의 IT 인프라를 갖출 수 있다. 둘째, CSP, CSB와 통합허브가 성장할 것이다. 플랫폼 전쟁이 시장 점유율 '횡령' 싸움임을 CSP들이 깨닫게 됨에 따라 이러한 가격 경쟁들은 더 잦아질 것으로 전망된다. 그리고 2013년 클라우드 벤더들은 클라우드 가격 책정이 비용-수익 관리(costyield management)의 연장선에 있음도 알게 될 것이다. 핵심은 효율적 설계와 저비용 운영, 그리고 무엇보다 높은 사용률에 있다. 또한 기업들이 점점 많은 애플리케이션을 소프트웨어 형태로 구매하고 있기 때문에 애플리케이션 자체를 통합하는 문제, 애플리케이션에 대한 보안과 감사 프로세스개발 등의 문제가 제기되고 있다. 시스템 통합 서비스와 통합 허브는 이런 문제를 해결하기 위해 노력하게 될 것이다 셋째, 2013년은 하이브리드 클라우드 컴퓨팅이 급부상할 것으로 전망된다. 앞으로는 클라우드 컴퓨팅 시장에서 공급업체끼리 경쟁하는 것은 의미가 없으며 기업들은 절대 한 가지 클라우드 기술이나 공급자에 안주하지 않을 것이다. 이것은 곧 2013년에는 하이브리드 및 이종 클라우드 컴퓨팅이 각광 받을 것을 의미한다. 이러한 하이브리드 클라우드 컴퓨팅을 도입하기 위해서는 클라우드 컴퓨팅의 단점과 문제 해결을 위해 하나의 목적을 가지고 다양한 산업체들이 모여 경쟁업체이면서도 협력관계를 이루는 것이 중요하다. 넷째, 멀티 디바이스를 이용한 클라우드 사용이 폭발적으로 증가될 것으로 보인다. 1인당 여러 대의 단말 보유, 이동성 향상 요구, 4G 확산 등 모바일 시장을 중심으로 한 환경 변화로 인해 이전보다 한층 진화된 클라우드 기반의 서비스가 다양하게 등장할 것으로 예상된다. 또한 4G 시대가 본격적으로 개막되면서 데이터 및 앱을 저장하는 것뿐만 아니라 앱을 실행하는 프로세싱까지도 모두 인터넷 상의 서버에서 이루어지는 방식인 클라우드 스트리밍(Cloud Streaming)이라는 신기술이 상용화될 것으로 기대된다. 다섯째, 2013년에는 'XaaS(Everything as a Service)' 개념이 보다 확장될 것이다. 클라우드 컴퓨팅의 사용이 확산됨에 따라 하드웨어의 도입, 소프트웨어 및 데이터베이스 개발과 구축, IT 서비스 등 IT 인프라 스트럭처의 토대에 많은 변화가 생겼다. 인프라스트럭처는 더 이상 고정불변의 자산으로서가 아니라 유연성과 확장성을 강조하는 서비스로서의 특징으로 점점 부각되고 있다. 따라서 모든 IT 인프라스트럭처가 Ondemand화 서비스로 제공되는 비즈니스 모델들이 부상하고 있으며 플랫폼, 하드웨어 데이터베이스 등 모든 IT 요소를 서비스 형태로 제공하는 XaaS가 2013년 새로운 개념으로 떠오를 것으로 기대된다. 여섯번째로 스토리지를 둘러싼 가격 경쟁이 더욱 심화될 것으로 보인다. 업체들의 가격 인하는 앞으로도 계속될 것이며 사용자들에게도 큰 혜택으로 돌아갈 것이지만 사람들은 가격만으로 서비스를 선택하지 않을 것이기 때문에 가격보다는 차별화된 기능 및 서비스 전략이 필요할 것이다.

• KIPS Transactions on Computer and Communication Systems
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• v.7 no.2
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• pp.33-40
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• 2018

In an environment with a large network bandwidth, maximizing bandwidth utilization is an important issue to increase transmission efficiency. End-to-end transfer efficiency is significantly influenced by factors such as network, data transfer nodes, and intranet network security policies. Science DMZ is an innovative network architecture that maximizes transfer performance through optimal solution of these complex components. Among these, the data transfer node is a key factor that greatly affects the transfer performance depending on storage, network interface, operating system, and transfer application tool. However, tuning parameters constituting a data transfer node must be performed to provide high transfer efficiency. In this paper, we propose a method to enhance performance through tuning parameters of 100Gbps data transfer node. With experiment result, we confirmed that the transmission efficiency can be improved greatly in 100Gbps network environment through the tuning of Jumbo frame and CPU governor. The network performance test through Iperf showed improvement of 300% compared to the default state and NVMe SSD showed 140% performance improvement compared to hard disk.

• The KIPS Transactions:PartB
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• v.9B no.6
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• pp.853-862
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• 2002

Face Detection can be defined as follows : Given a digitalized arbitrary or image sequence, the goal of face detection is to determine whether or not there is any human face in the image, and if present, return its location, direction, size, and so on. This technique is based on many applications such face recognition facial expression, head gesture and so on, and is one of important qualify factors. But face in an given image is considerably difficult because facial expression, pose, facial size, light conditions and so on change the overall appearance of faces, thereby making it difficult to detect them rapidly and exactly. Therefore, this paper proposes fast and exact face detection which overcomes some restrictions by using neural network. The proposed system can be face detection irrelevant to facial expression, background and pose rapidily. For this. face detection is performed by neural network and detection response time is shortened by reducing search region and decreasing calculation time of neural network. Reduced search region is accomplished by using skin color segment and frame difference. And neural network calculation time is decreased by reducing input vector sire of neural network. Principle Component Analysis (PCA) can reduce the dimension of data. Also, pose estimates in extracted facial image and eye region is located. This result enables to us more informations about face. The experiment measured success rate and process time using the Squared Mahalanobis distance. Both of still images and sequence images was experimented and in case of skin color segment, the result shows different success rate whether or not camera setting. Pose estimation experiments was carried out under same conditions and existence or nonexistence glasses shows different result in eye region detection. The experiment results show satisfactory detection rate and process time for real time system.

• Journal of KIISE:Databases
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• v.34 no.1
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• pp.1-17
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• 2007

As XML is becoming a de facto standard for distribution and sharing of information, the need for an efficient yet secure access of XML data has become very important. To enforce the fine-level granularity requirement, authorization models for regulating access to XML documents use XPath which is a standard for specifying parts of XML data and a suitable language for both query processing. An access control environment for XML documents and some techniques to deal with authorization priorities and conflict resolution issues are proposed. Despite this, relatively little work has been done to enforce access controls particularly for XML databases in the case of query access. Developing an efficient mechanism for XML databases to control query-based access is therefore the central theme of this paper. This work is a proposal for an efficient yet secure XML access control system. The basic idea utilized is that a user query interaction with only necessary access control rules is modified to an alternative form which is guaranteed to have no access violations using tree-aware metadata of XML schemes and set operators supported by XPath 2.0. The scheme can be applied to any XML database management system and has several advantages over other suggested schemes. These include implementation easiness, small execution time overhead, fine-grained controls, and safe and correct query modification. The experimental results clearly demonstrate the efficiency of the approach.

• Journal of Broadcast Engineering
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• v.17 no.2
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• pp.374-387
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• 2012

In this paper, we implement a new hardware for finding the significant coefficients of a digital hologram and ciphering them using discrete wavelet packet transform (DWPT). Discrete wavelet transform (DWT) and packetization of subbands is used, and the adopted ciphering technique can encrypt the subbands with various robustness based on the level of the wavelet transform and the threshold of subband energy. The hologram encryption consists of two parts; the first is to process DWPT, and the second is to encrypt the coefficients. We propose a lifting based hardware architecture for fast DWPT and block ciphering system with multi-mode for the various types of encryption. The unit cell which calculates the repeated arithmetic with the same structure is proposed and then it is expanded to the lifting kernel hardware. The block ciphering system is configured with three block cipher, AES, SEED and 3DES and encrypt and decrypt data with minimal latency time(minimum 128 clocks, maximum 256 clock) in real time. The information of a digital hologram can be hided by encrypting 0.032% data of all. The implemented hardware used about 200K gates in $0.25{\mu}m$ CMOS library and was stably operated with 165MHz clock frequency in timing simulation.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.4
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• pp.308-315
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• 2012

Hebei Spirit Oil Spill that happened in 2007 had prompted the need of revisiting the coastal safety. In response to this, Korea had made an effort to implement VTS in every coastline in the country. There are a lot of theoretical studies on VTS function nowadays, but coastal VTS are less frequently studied. In this paper, performance analysis results and accident prevention activities of Jindo Coastal VTS center were summarized and the Coastal VTS function are investigated. Jindo Coastal VTS covers relatively wide area and various places with various maritime traffic characteristics are the major navigation vessels, which means that it is important to control these vessels. Since the probability of accidents due to human error is relatively high in coastal area due to negligence tendency of crews during coastal area navigation, coastal VTS has to provide sufficient assistance to navigating vessels. Like most harbour VTS, Coastal VTS provides not only main information service, navigational assistance and traffic organization services but also various services related with advanced search-and-rescue assistance, marine national security, maritime crime prevention, oil spill response, traffic services for non-service vessel, and safety supervision for water leisure boats.

• The Journal of the Korea Contents Association
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• v.18 no.8
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• pp.536-543
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• 2018

In 2003, the local police system was adopted, and the personnel and installation of local police agencies were subsequently changed. According to the "Police Law", local police station shall be established under the control of chief of police department, and the criteria for the installation of local police stations were to take into consideration of population, administrative districts, area, geographical characteristics, traffic and other conditions. The chief of local police has the authority to install district police station according to the "National Police Agency and its Organization". However, it is hard to say they were applied. Futhermore, it is inappropriate to apply the laws and regulations equally across the nation. Also, it has been criticized for its difficulties of patrolling, the weakened relationship with local residents, and poor quality of security services in rural areas. Therefore, this study suggests that the criteria for the installation of the police station should be made through a comprehensive analysis of the characteristics of the areas and security needs.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.5
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• pp.1000-1008
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• 2009

It also increases the competitive power of the nation. With all these merits of electronic documents, there exist threats to the security such as illegal outflow, destroying, loss, distortion, etc. Currently, the techniques to protect the electronic documents against illegal forgery, alteration or removal are not enough. Until now, various security technologies have been developed for electronic documents. However, most of them are limited to prevention of forgery or repudiation. Cryptography for electronic documents is quite heavy that direct cryptography is not in progress. Additionally, key management for encryption/decryption has many difficulties that security has many weak points. Security has inversely proportional to efficiency. It is strongly requested to adopt various cryptography technologies into the electronic document system to offer more efficient and safer services. Therefore, this paper presents some problems in cryptography technologies currently used in the existing electronic document systems, and offer efficient methods to adopt cryptography algorithms to improve and secure the electronic document systems. To validate performance of proposed method compare with the existing cryptographies, critical elements have been compared, and it has been proved that the proposed method gives better results both in security and efficiency.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.6
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• pp.2729-2738
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• 2012

The purpose of this study is, to analyze the recent trend of studies on SaaS(Software as a Service) in Korea and to suggest a direction for the future research. For this purpose, the relevant literatures published in Korea Citation Index and literatures presented in conferences were gathered. Among these literatures, total of 39 samples were selected and used in the systematic literature review. The result shows that the application of SaaS in actual operations of industries are widely proliferated. However, the studies on SaaS generally lacks in its number and types. For example, studies so far are only on field of engineering and technology. Considering the fact that SaaS is moving towards the service orientation, studies on SaaS should develop in the fields of policy, business, individual and society sides of studies. In addition, the existing studies uses different concepts of relations between SaaS and ASP(Application Service Provider), as well as, different definitions of SaaS. Lastly, our research analyzed the problems of utilization of SaaS and found that, the quality, performance and security are presented as the core of the problems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.322-331
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• 2016

This study examines the effects of social commerce service quality and the service provider's physical environment on customer loyalty based on trust and satisfaction. Study results are as follows: First, correlation analysis results for social commerce service quality and social commerce trust find that informativity and interactivity exert statistically significant effects on social commerce trust. Second, service provider's physical environment and service provider satisfaction correlation analysis results demonstrate cleanliness, ambience, and interactivity exert statistically significant effects on service provider satisfaction. Lastly, the correlation between social commerce trust, service provider satisfaction, and social commerce loyalty, was statistically significant. Results of this study are expected to provide general understanding of group purchase decisions in social commerce and to provide value input in strategy development for social commerce with respect to group purchase and service provider.