• Nuclear Engineering and Technology
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• 제53권7호
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• pp.2387-2395
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• 2021

Seismic qualifications of electrical equipment, such as cabinet systems, have been emerging as the key area of nuclear power plants in Korea since the 2016 Gyeongju earthquake, including the high-frequency domain. In addition, electrical equipment was sensitive to the high-frequency ground motions during the past earthquake. Therefore, this paper presents the rocking behavior of the electrical cabinet system subjected to Reg. 1.60 and UHS. The high fidelity finite element (FE) model of the cabinet related to the shaking table test data was developed. In particular, the first two global modes of the cabinet from the experimental test were 16 Hz and 24 Hz, respectively. In addition, 30.05 Hz and 37.5 Hz were determined to be the first two local modes in the cabinet. The high fidelity FE model of the cabinet using the ABAQUS platform was extremely reconciled with shaking table tests. As a result, the dynamic properties of the cabinet were sensitive to electrical instruments, such as relays and switchboards, during the shaking table test. In addition, the amplification with respect to the vibration transfer function of the cabinet was observed on the third floor in the cabinet due to localized impact corresponding to the rocking phenomenon of the cabinet under Reg.1.60 and UHS. Overall, the rocking of the cabinet system can be caused by the low-frequency oscillations and higher peak horizontal acceleration.

• 전기전자학회논문지
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• 제18권4호
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• pp.636-644
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• 2014

본 논문에서는 스마트 홈 환경 내에서 웰니스 로봇의 이동을 위한 로봇의 사물인터넷 기반 지능형 자기위치인식 및 자세제어 방법을 제안한다. 먼저, 자기위치인식 방법은 스마트 홈, 홈 환경 내 위치하고 있는 물체, 홈 웰니스 로봇 간의 사물인터넷을 기반으로 하는 방법을 제안한다. 스마트 홈에 RF태그를 설치하고 환경 내 물체에 RF 리더를 내장하여 환경 내 물체의 절대좌표 정보를 획득하고, 물체와 홈 웰니스 로봇간 블루투스 통신을 이용하여 물체의 절대좌표 정보를 홈 웰니스 로봇에 제공한 후, 홈 웰니스 로봇에 장착되어 있는 스테레오 카메라를 통해서 물체를 기준으로 한 홈 웰니스 로봇의 상대 좌표를 알아내어 로봇의 스마트 홈 환경에서의 자기위치인식을 한다. 둘째로, 홈 웰니스 로봇의 물체 접근을 위한 비전센서 기반의 퍼지 자세 제어 방법을 제안한다. 홈 웰니스 로봇의 정면에 장착된 스테레오 카메라를 기준으로 물체까지의 깊이 정보를 추출하고 영상의 중앙을 기준으로 틀어진 각을 계산하여 물체와 홈 웰니스 로봇 정면과의 각도차를 알아낸다. 얻은 정보를 퍼지 순람표(Look-Up table)로 작성하여 물체에 접근하기 위한 홈 웰니스 로봇의 자세제어를 하도록 한다. 이렇게 제안한 각각의 자기위치인식 및 자세제어 방법의 성능은 실제 구축한 스마트 홈 환경과 웰니스 로봇을 가지고 실험하여 확인한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.1201-1204
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• 2005

Whereas conveniences deriving from the development of information and telecommunication technology increase, information outflow and illegal data use are also rapidly on the rise. Consequently, many studies to prevent illegal information outflow are currently under way, and the use of Smart Card is in steep jump. Recently, Java Card is diffused fast as an alternative to complement the technical problems of the Smart Card. This paper designed and materialized the system for multi-users authentication and file access control by user through designing a Java Card applet that is used for information protection and in various application fields. For allowing a file access competence, each user's file access competence is processed via drawing up the access condition table in the applet. Therefore, illegal correction, exposure and destruction of information, which become the concerns when multi-users have an access, can be prevented. In addition, its application becomes possible in the system requiring multi-users certifications.

• 전기전자학회논문지
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• 제22권1호
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• pp.93-97
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• 2018

본 논문에서는 자동화 시스템을 이용하여 지속적으로 녹조를 제거하고 워터펌프를 이용하여 산소를 물속에 주입하여 녹조 생성이 잘 이루어지지 않도록 하는 시스템을 개발하였다. 제안한 녹조제거 자동화 시스템은 기계에 부착된 MCU(micro processor unit)를 이용하여 GPS와 초음파센서, 카메라등을 제어함으로 자동조정운행을 할 수 있고, 컨베이어 벨트, 워터 펌프등을 이용하여 녹조를 자동으로 제거할 수 있다. 또한 스마트폰의 어플리케이션과 연동하여 녹조제거 자동화 시스템의 위치를 추적하고 상황에 따라 사용자가 시스템을 직접 운영 할 수 있도록 하였다.

• IEIE Transactions on Smart Processing and Computing
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• 제3권1호
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• pp.1-9
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• 2014

This paper proposes a low-latency Sample Adaptive Offset filter (SAO) architecture and its Single Instruction Multiple Data (SIMD) optimization scheme to achieve fast High Efficiency Video Coding (HEVC) decoding in a multi-core environment. According to the HEVC standard and its Test Model (HM), SAO operation is performed only at the picture level. Most realtime decoders, however, execute their sub-modules on a Coding Tree Unit (CTU) basis to reduce the latency and memory bandwidth. The proposed low-latency SAO architecture has the following advantages over picture-based SAO: 1) significantly less memory requirements, and 2) low-latency property enabling efficient pipelined multi-core decoding. In addition, SIMD optimization of SAO filtering can reduce the SAO filtering time significantly. The simulation results showed that the proposed low-latency SAO architecture with significantly less memory usage, produces a similar decoding time as a picture-based SAO in single-core decoding. Furthermore, the SIMD optimization scheme reduces the SAO filtering time by approximately 509% and increases the total decoding speed by approximately 7% compared to the existing look-up table approach of HM.

• Journal of Information Technology Applications and Management
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• 제20권1호
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• pp.67-85
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• 2013

The emergence of RFID markets and development of various RFID-embedded mobile devices has brought fundamental changes to our lives. As the availability of RFID readers and tags that are implanted in smart phones and table PCs increases, information on RFID-affixed objects can be tracked wirelessly and this had open possibilities for B2B businesses to be run like B2C businesses. However, given the popularity of the RFID markets, there is limited research in this area. This paper serves to develop an extended technology acceptance model by Mobile RFID characteristics (perceived cost, security, instant connectivity, context awareness, and result demonstrability) examines the determinant factors that cause the acceptance of mobile RFID. To do so, the study conducted a survey targeting smart phone users and used the PLS path modeling, one of the structural equation models to verify the significance of research hypothesis. As a result, perceived cost, instant connectivity, context awareness, and result demonstrability turned out to have a real effect on intention to use mobile RFID by means of perceived usefulness and perceived ease of use. Security turned out to have a partial effect on intention to use mobile RFID by means of perceived usefulness or perceived ease of Use.

• 디지털산업정보학회논문지
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• 제12권1호
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• pp.81-87
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• 2016

Cloud computing technologies are utilized and merged in various domains. Cloud computing technology-based personal cloud service technologies provide mobility and free access by using user centered storages and smart devices such like smart phones and table PCs. Therefore, we should overcome limits on the storage by solving the capacity problems of devices to provide security services in the personal cloud environments It can be addressable to provide the convenience of various security technologies. However, there are some security threats inherited from existing cloud environments and the possibilities of information leakage when devices are lost or stolen. Therefore, we designed a framework for providing secure cloud services by adding objects, such as user authorization, access tokens, set permissions by key generation, and key management assignments, for user management in personal cloud environments. We analyzed the stability of the proposed framework in terms of irreverent use and abuse, access to insiders, and data loss or leakage. And we evaluated the proposed framework in terms of the security with access control requirements in personal cloud environments.

• 유통과학연구
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• 제17권3호
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• pp.41-47
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• 2019

Purpose - Based on the analysis of Kazakhstan's experience of digital transformation, this study suggests a concept for digital solution to optimize organizational process, create trust networking between the center of state scholarships programs and recipients. In addition, the authors contribute to the current discussions of an effective digital transformation of state services. Research design, data, and methodology - Policy analysis is based on the combination of both primary and secondary materials collected during a Policy Research Project conducted in Kazakhstan in 2017. It involved semi-structured interviews with the state scholarship' recipients, ICT experts and findings from academic articles. Results - Findings are represented via Policy Development Matrix - a table with three options (status quo, partial change, total change) to deal with policy challenges. Authors suggest a concept for digital solution following the Customer Relationship Management (CRM) principles for optimizing core business processes, communication and networking strategies of the state scholarships program. Conclusions - At the time when digitalization becomes trending for states, the transformation of the state education policy is inevitable. The rapid development of digital technologies creates new opportunities for a single integration platform with key principles of Smart Remote Management in the state scholarships programs.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2011년도 추계학술대회
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• pp.862-865
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• 2011

WebGL은 OpenGL ES 2.0기반의 로우레벨(low-level) 3차원 그래픽스 API를 위한 크로스 플랫폼 웹 표준으로써, 웹 브라우저에서 별도의 플러그인을 설치하지 않고도 3차원 그래픽을 표현할 수 있도록 해준다. WebGL이 더욱 관심을 끌고 있는 이유는 PC 뿐만 아니라 스마트폰, 태블릿, 스마트 TV 등 다양한 디바이스를 위한 차세대 RIA(Rich Internet Application) 플랫폼으로 각광을 받고 있는 HTML5의 표준 안에 포함되기 때문이다. 본 연구에서는 WebGL 기반의 콘텐츠에서 복잡한 상호작용과 3차원 객체의 행위 모델을 쉽고 빠르게 저작하기 위한 행위 엔진을 제안하고 개발하고자 한다.

• 한국콘텐츠학회논문지
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• 제13권2호
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• pp.44-51
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• 2013

인터넷에서 초고속 서비스의 제공을 위해서, 라우터는 신속하게 IP 주소 검색을 수행해야 한다. 본 논문에서는 4 단계의 파이프라인으로 구성된 하이브리드 방식의 병렬 IP 주소 검색 구조를 제안한다. 단계 2의 다중 SRAM과 단계 3의 분할 TCAM을 사용하여 저렴한 비용으로 병렬화를 이루고, 파이프라이닝을 통해 처리율을 향상시켰다. 단계 1에서 스마트 분배기는 선행된 IP 주소와 동일한 주소를 다음 단계로 진입시키지 않고 선행의 검색 결과를 그대로 활용하게 한다. 이에 따라, 캐싱 효과에 의해 검색 처리율을 더욱 향상시키고, 단계 3인 TCAM bank로의 접근 충돌도 완화시킬 수 있다. 마지막 단계의 재정렬 버퍼는 처리된 IP 주소 순서를 입력 순서에 맞도록 재조정하는 기능을 수행한다. 또한, 실제 사용되는 라우팅 테이블과 Zipf 법칙에 따라 생성된 트래픽 분포를 사용하여, 병렬 파이프라인 IP 검색 구조의 성능을 기존의 하이브리드 구조와 비교하여 평가한다.