• The Journal of Society for e-Business Studies
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• v.24 no.2
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• pp.165-178
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• 2019

In an environment transformed by smart factories, measuring the current level of the manufacturing system, deriving improvement targets and tasks and increasing the level of manufacturing competitiveness become the basic activities of the company. However, research on the component analysis and maturity assessment to ensure the future competitiveness of the company is in progress and in the early stages. This study analyzed the existing research on various models, development process, and framework for manufacturing system. In addition, we designed a structural model by deriving the components of future manufacturing system through smart factory related maturity assessment studies. We designed a meta-model that includes an assesment model and a transformation model, and derived the framework development process to propose an integrated framework for the maturity assessment of the future manufacturing system. We verified it by applying it into an actual evaluation project of smart factory.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.569-572
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• 2008

최근 각광 받고 있는 서버 기반 컴퓨팅(SBC, Server-based Computing)은 많은 수의 서버가 필요하기 때문에 많은 수의 서버를 관리할 수 있는 관리자 시스템의 필요성이 대두되고 있다. 이에 관리자 네트워크를 필요에 따라, 코맨드 센터(CC, Command Center), 서버 에이전트(SA, Server Agent), 관리자 인터페이스(Manager Interface), 유저 에이전트(UA, User Agent)등 네 가지 모듈로 분리하여 필요한 시스템 기능을 구현하는 것만으로 저비용으로 신뢰성 있는 네트워크를 구축할 수 있는 네트워크 프레임워크를 개발하고, 그 성능을 측정하였다.

• Journal of Internet Computing and Services
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• v.14 no.4
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• pp.13-24
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• 2013

IEEE 802.15.4 network and WiFi network are installed to overlap each other and configured to use adjacent frequency bands in which case the communication service required by applications can not be guaranteed because of randomly increased frame transmission delay and frequent frame transmission failures at nodes in IEEE 802.15.4 network. In this paper, transmission delay model at IEEE 802.15.4 nodes and an experimental system to evaluate the interference from WiFi traffic are described, then elements for the evaluation of interference are measured with the analysis of their characteristics. A sequential method of using medium access layer and physical layer elements of IEEE 802.15.4 protocols is proposed to decide interference from WiFi network. With the proposed method, if an evaluation function having frame transmission failures and transmission delay as variables returns a value greater than a threshold, intensive measurements of wireless channel power are carried out subsequently and the final decision of interference is made by the calculated average channel power. Experimental results of the method show that the decision time is reduced with increased frequency of decision in comparison to an other similar method.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.265-268
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• 2008

유사 쉐이더 검색이란 그래픽 디자이너가 원하는 쉐이더와 유사한 쉐이더를 검색하는 것을 의미한다. 본 논문의 저자들은 유사 쉐이더 검색을 이용하여 쉐이더 생성 시 발생하는 시행착오와 시간을 크게 줄일 수 있는 쉐이더 스페이스 네비게이터를 제안한 바 있다. 유사 쉐이더 검색을 수행하기 위해서는 서로 다른 네트워크 구조를 가지는 쉐이더들로부터 동일한 특징들을 추출할 수 있는 방안이 요구된다. 본 논문에서는 이러한 문제를 해결하기 위하여 계층적 인지감 추출 프레임워크를 제안한다. 제안하는 프레임워크는 복잡한 네트워크를 가지는 쉐이더들을 분석하여 검색에 필요한 고정된 소수의 특성들만을 추출한다. 추출된 특성들은 서로 다른 네트워크 구조에서도 동일한 수와 형태를 갖기 때문에 다른 구조의 쉐이더들 간에도 유사도를 쉽게 측정할 수 있다. 다양한 실험을 수행함으로써 제안하는 프레임 워크를 이용하여 유사 쉐이더를 효과적으로 검색할 수 있음을 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.370-372
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• 2017

사이버 위협이 고도화, 지능화되면서 사이버보안 사고로 비롯한 유무형 손실이 점차 증가추세에 있으며, 이러한 피해를 최소화 하기 위해 사이버보안에 대한 필요성이 증대되고 있다. 기업에서는 각종 규제와 법률에 근거하여, 또는 신뢰할 수 있는 서비스를 고객에게 제공하기 위해서 보안 솔루션, 보안 서비스, 보안 컨설팅 등 다양한 방면에서 보안에 대한 투자를 늘리고 있다. 기업의 보안에 대해 투자는 비용과 효과를 분석하여야 효율적이고 효율적인 투자일 것이나, 아직은 이에 적합한 방안이 제시되지 않고 있다. 따라서 본 연구는 사이버보안 환경에 적합한 비용/효과 분석 방안으로 CMU SQUARE 팀의 비용효과분석 프레임워크를 선택하였고, SQUARE의 프레임워크를 기반으로 사이버보안 투자에 적합한 비용/효과 측정 방안을 제시하였다. 특히 기존의 금전적 효과에만 치중되어 연구가 부족했던 정성적 효과를 고려하여, 사이버보안 투자에서 발생되는 효과를 종합적으로 측정할 수 있도록 한다. 본 연구의 결과는 사이버보안과 관련된 투자의 비용/효과를 산출함으로써 기업의 보안 투자 방안 추진의 기준이 될 것이다.

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.366-370
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• 2010

로봇 기술이 발달하면서 사람의 지령에 의해 수동적, 반복적인 작업을 수행하던 기존 전통적 로봇에서 벗어나, 스스로 외부환경을 인식하고, 상황을 판단하여 자율적으로 동작하는 지능형 로봇이 등장하였다. 이러한 로봇의 S/W개발은 편의성을 위해 범용 운영체제를 사용하여 개발하는 추세이다. 지능형 서비스의 QoS(Quality of Service)를 위해서는 로봇 미들웨어에 실시간성을 지원해야 하지만 범용 운영체제는 실시간성을 지원하지 않는 문제점이 있다. 본 논문에서는 범용 운영체제인 오픈솔라리스에 실시간성을 위한 논리적 정확성 및 시간 결정성을 보장하기 위하여 실시간 스케쥴러를 포함한 실시간 프레임 워크 RTL(Real-Time Layer)을 설계 및 구현한 내용을 기술한다. 또한 성능측정을 위해 쓰레드의 응답시간을 측정하였다.

• The Transactions of the Korea Information Processing Society
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• v.6 no.6
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• pp.1598-1608
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• 1999

Performance testing for ATM network deals with evaluation of maximal throughput of network by measuring and analyzing of various performance parameters. However, because of the absence of the methodology and framework for performance testing, the results of performance measurements for same implementation under test were much relied on tester. In this paper, the concept of ATM performance testing is described in both cell and frame level and a framework of ATM performance testing is suggested by describing of testing environment for performance measurement and requirements of performance evaluation. For this, we define performance measuring method and parameters for each case.

• Journal of Broadcast Engineering
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• v.13 no.5
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• pp.586-595
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• 2008

In this paper, we propose an adaptive multi-view video service framework suitable for mobile environments. The proposed framework generates intermediate views in near-realtime and overcomes the limitations of mobile services by adapting the multi-view video according to the processing capability of a mobile device as well as the user characteristics of a client. By implementing the most of adaptation processes at the server side, the load on a client can be reduced. H.264/AVC is adopted as a compression scheme. The framework could provide an interactive service with efficient video service to a mobile client. For this, we present a multi-view video DIA (Digital Item Adaptation) that adapts the multi-view video according to the MPEG-21 DIA multimedia framework. Experimental results show that our proposed system can support a frame rate of 13 fps for 320{\times}240 video and reduce the time of generating an intermediate view by 20 % compared with a conventional 3D projection method.

• Journal of KIISE:Information Networking
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• v.41 no.4
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• pp.151-166
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• 2014

The present method of measuring QoE (Quality of Experience) was to measure the whole block from the server that provides service to the terminal that the client gets the service. In this way, it was possible to simply determine whether the quality of QoE was good or not, and when the quality of QoE became bad, there was no way of presenting solutions. Also, as QoE metrics are numerous, there has been no strict regulation on how to use. This study analyzed QoE metrics in the viewpoints of network and clients, subdivided the whole service into three phases including one from the server providing the service to the router, another from the router to the terminal getting the service, and the third from the service router to the client router, and presented QoE metric frames appropriate for each phase. Through this, in the KOREN-CERNET environment, this study designed and embodied QoE network and demonstrated stability of QoE network, reduction in client complaint settlement time, and content adjustment effect according to the network change.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2744-2748
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• 2015

This paper analyzes the effect on productivity by measuring Function Point per MM(man-month) in a software development project and code inspection which performed in Agile methodology, and introduce the method of applying MDA/MDD technology in the e-government standard framework project. MDA/MDD which recently raising its head is technology that increase software development productivity through automatic transformation form abstract model into lower abstract model, or from model to code. but, many Lessons obtained through the case studies, the analysis suggests a limited effect measurements. In this study, efficient development methodology and utilizing a e-government framework to measure the effectiveness of the MDD to the new measures through a case study applied to real information system development process. In addition to, managing information modeling through integrated repository presents a traceability and visibility.