• 인터넷정보학회논문지
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• 제23권5호
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• pp.17-23
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• 2022

Network slicing is a promising paradigm and significant evolution for adjusting the heterogeneous services based on different requirements by placing dynamic virtual network functions (VNF) forwarding graph (VNFFG) and orchestrating service function chaining (SFC) based on criticalities of Quality of Service (QoS) classes. In system architecture, software-defined networks (SDN), network functions virtualization (NFV), and edge computing are used to provide resourceful data view, configurable virtual resources, and control interfaces for developing the modified deep reinforcement learning agent (MDRL-A). In this paper, task requests, tolerable delays, and required resources are differentiated for input state observations to identify the non-critical/critical classes, since each user equipment can execute different QoS application services. We design intelligent slicing for handing the cross-domain resource with MDRL-A in solving network problems and eliminating resource usage. The agent interacts with controllers and orchestrators to manage the flow rule installation and physical resource allocation in NFV infrastructure (NFVI) with the proposed formulation of completion time and criticality criteria. Simulation is conducted in SDN/NFV environment and capturing the QoS performances between conventional and MDRL-A approaches.

• 한국산학기술학회논문지
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• 제8권1호
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• pp.82-95
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• 2007

본 논문은 소프트웨어의 아키텍처 설계에서 많이 활용될 수 있는 아키텍처 패턴들을 분류하고 명세화하는 방법을 주제로 한다. 이를 위해 먼저 아키텍처 패턴의 활용과 관련한 개선된 아키텍처 개발방법론을 제시하고, 이러한 방법론을 지원하기 위한 패턴의 분류와 정의방법을 제안한다. 패턴은 추상화 레벨이나 응용 도메인에 따라 매우 다양하기 때문에, 여러 가지 각도에서의 분류체계를 제시하여 향후 분류 및 저장된 아키텍처 패턴을 쉽게 검색하고 활용할 수 있도록 고려하였다. 또한 패턴의 표현이 다양하여 패턴의 이해가 용이하지 못한 점을 고려하여 패턴의 추상화 개념을 도입하고, 패턴간의 관계를 정의하는 방법을 제시하여 패턴들의 핵심적인 구조와 역할에 대한 이해를 돕고자 하였다 아울러, 아키텍처 패턴을 선정할 때의 중요한 고려사항이 되는 품질속성도 기존의 범용적인 개념에서 아키텍처 지향적인 개념으로 확장이 가능하도록 하여 각각의 아키텍처 패턴을 정의할 때 보다 명확한 아키텍처의 품질에 대한 명세가 함께 설명되도록 하였다.

• 전자공학회논문지SC
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• 제46권5호
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• pp.15-21
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• 2009

LED와 같은 소형 제품의 불량검색은 제품의 질을 향상 시키는 것만 아니라 생산성 향상에서 중요한 역할을 한다. 본 연구에서는 LED에 발생하는 여러 가지 불량을 자동으로 검사하는 시스템을 구성하였다. LABVIEW Builder를 사용하여 그래픽 인터페이스 상에서 LED의 불량을 검출을 자동판단하며, 사용자가 쉽게 사용 가능하도록 설계하였다. 1394 카메라를 통해 영상을 획득하고 Vision Builder의 각 영상처리 요소를 적용하였다. 에지탐색, 기하학 위치 설정, 거리측정 등의 영상처리 알고리즘을 조합하여 색과 크기가 다른 다양한 LED의 불량을 검출하는 알고리즘을 설계하였다.

• Nuclear Engineering and Technology
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• 제38권3호
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• pp.259-276
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• 2006

As the use of digital systems becomes more prevalent, adequate techniques for software specification and analysis have become increasingly important in nuclear power plant (NPP) safety-critical systems. Additionally, the importance of software verification and validation (V&V) based on adequate specification has received greater emphasis in view of improving software quality. For thorough V&V of safety-critical systems, V&V should be performed throughout the software lifecycle. However, systematic V&V is difficult as it involves many manual-oriented tasks. Tool support is needed in order to more conveniently perform software V&V. In response, we developed four kinds of computer aided software engineering (CASE) tools to support system specification for a formal-based analysis according to the software lifecycle. In this work, we achieved optimized integration of each tool. The toolset, NuSEE, is an integrated environment for software specification and V&V for PLC based safety-critical systems. In accordance with the software lifecycle, NuSEE consists of NuSISRT for the concept phase, NuSRS for the requirements phase, NuSDS for the design phase and NuSCM for configuration management. It is believed that after further development our integrated environment will be a unique and promising software specification and analysis toolset that will support the entire software lifecycle for the development of PLC based NPP safety-critical systems.

• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.1928-1934
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• 2014

Induction motors are widely used due to their rugged, robust and easy to care features. Since they are heavily used in industry, testing of three phase induction motors have play a vital role. In order to determine motor equivalent circuit parameters, efficiency of motor, squirrel caged laboratory sized an induction motor test setup is prepared. It is suitable for the induction motor with the frame size of 100 and 112. A virtual Instrumentation typed engineering workbench (called as LabVIEW) software packet, is utilized as a graphical user interface program. Motor input power is measured by measuring the input voltage, current and power factor with the help of hall effect typed voltage and current transformers. Also, the output power is measured by measuring the speed and torque with the help of an encoder and torque sensor. All outputs of the voltage and current transformer, encoder and temperature, torque sensors are given to the Data Acquisition Card (DAQ) which acquires the data for processing and then the equivalent circuit parameters, efficiency, performance and loading characteristics are found out, using LabVIEW based user interface. It is suggested to use this test rig for the quality control of produced motors in industry, and an educational experiment setup in the school laboratories.

• 정보교육학회논문지
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• 제5권2호
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• pp.288-301
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• 2001

교육 정보화의 핵심은 정보 교육을 위한 인프라 구축과 정보 통신 기술의 교육적 활용에 있으며, 활용의 측면에서는 수업의 정보화를 지원할 수 있는 양질의 교육용 소프트웨어 확보가 관건이다. 이는 교육용 SW 평가 방안의 탐구가 얼마나 중요한 과제인가를 시사해 준다. 본 연구는 이와 같은 문제 인식을 바탕으로 첫째, 수요자 측면에서 양질의 교육용 소프트웨어를 선정하고 활용을 조장할 수 있는 과학적인 정보를 제공하고, 둘째, 개발자 측면에서 객관적인 품질 평가의 준거를 제공함으로써, 양질의 교육용 소프트웨어를 개발할 수 있는 방향과 정보를 제공함으로써 교육 정보화의 기반을 다지기 위해 수행되었다. 이를 위해, 기존 교육용 SW 평가에 관련된 연구들을 분석하고, 소프트웨어 평가 준거를 교육적 차원, 운용적 차원, 기술적 차원의 세 영역으로 분류하고 세부 평가 준거를 도출하였다.

• 방송공학회논문지
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• 제13권3호
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• pp.328-338
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• 2008

H.264/AVC기반의 다시점 영상 부호화 기술은 시점간 상관성을 이용한 새로운 예측 방법을 이용하여 여러 대의 카메라로부터 촬영된 영상을 효율적으로 부호화하는 기술이다. 그러나 다시점 부호화 기술은 시점의 증가와 시점간 예측의 사용으로 인해 부호화 시간이 크게 증가한다. 본 논문은 부호화 시간을 줄이기 위해 다시점 영상에서 시점간에 대응하는 마크로블록 (Macroblock) 기반 영역 분할 정보와 시점간의 전역 변이 벡터를 이용한 고속 모드 결정 방법을 제안한다. 제안하는 방법은 다시점 영상 부호화 표준의 참조 소프트웨어인 joint multi-view video model (JMVM) 4.0에 비해 약 0.04dB의 화질 열화를 보이지만 전체 부호화 시간을 평균적으로 40% 단축할 수 있었다.

• Computers and Concrete
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• 제10권4호
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• pp.409-417
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• 2012

The quality of high performance concrete largely depends on water cement ratio, porosity, material composition and mix methods. The uniformity of color, texture and compressive strengths are quality indicators commonly used to assess the overall characteristics of concrete mixes. The homogeneity and share of coarse aggregates play a key role in concrete quality and must be analyzed in a microscopic point of view. This research studies the quality of high performance concrete by taking drilled cores in both horizontal and vertical directions from a 1.0 $m^3$ specimen. The coarse aggregate, expressed in digitized $100{\times}116$ dpi resolution images are processed based on brightness in colors through commercial software converted into text files. With the image converting to text format, the share of coarse aggregate is quantified leading to a satisfactory assessment of homogeneity - a quality index of high performance concrete. The compressive strengths of concrete and the shares of coarse aggregate of the samples are also compared in this research study to illustrate its correlation in concrete quality. It is concluded that a higher homogeneity of aggregate exists in the vertical plane than that of the horizontal planes of the high performance concrete. In addition, the concrete specimen showing denser particle packing has relatively higher compressive strengths. The research methodology provides an easy-to-use, direct measurement of high performance concrete when conducting quality assessment in the construction site.

• 유통과학연구
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• 제20권8호
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• pp.21-31
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• 2022

Purpose: This study aims to enrich the literature related on Patronage intention in the context of omnichannel in Tunisia. It reveals the determinants of Patronage intention in the fashion retailer context by examining the roles of omnichannel integration quality (IQ), omnichannel perceived value (PV), flexibility, operational logistics service quality (OLSQ) and customer satisfaction. Research design and methodology: A quantitative online survey with 400 customers of fashion retailers was executed. A structural equation modeling approach was applied to test the research hypotheses using AMOS 25 and SPSS 25 software. Results: The findings show that the omnichannel integration quality, omnichannel perceived value, and operational logistics service quality affect play crucial roles in customer satisfaction. A positive relationship between flexibility and operational logistics service quality was also highlighted. And it is also found that a higher omnichannel integration quality led to a higher omnichannel perceived value in the omnichannel retailing context. Furthermore, customer satisfaction within omnichannel retailing can enhance patronage intention. Conclusions: This research adds to the body of knowledge in omnichannel retailing and presents a comprehension of the omnichannel system from the customer's point of view. In addition, this study provides practical implications for omnichannel retailers to improve customer satisfaction and patronage intention.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1669-1679
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• 2010

Related to the on-going "Train Control System Project of Pilot Line Construction for Urban MAGLEV Train", activities by each phase shall be conducted to achieve SIL4 level and obtain safety certification from the Independent Safety Assessment(ISA), based on the IEC standards((IEC 62278/62279 and IEC 62425) for the first time in Korea. This thesis describes the introduction of IEC standards, system assurance activities (such as plan, analysis, test, verification and validation) in compliance with requirements management and project life-cycle and relations with the safety assessment activities; and certification activities (such as document reviews and audits) through system RAMS activities, software quality assurance activities and safety assessment, for the purpose of achieving a successful safety certification at the time of completing the project as system assurance activities including software and safety certification activities in order to acquire the safety certification for train control system which does not exist at all in domestic cases. It is believed that overall system safety assurance activities in this project will contribute to develop more upgraded products of the domestic train control system on the quality and safety point of view, find overseas markets and establish a bridgehead in the future.