• 시스템엔지니어링학술지
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• 제12권2호
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• pp.101-114
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• 2016

A model-based systems engineering (MBSE) approach to implementing hardware-based network cybersecurity controls for APR1400 non-safety data network is presented in this work. The proposed design was developed by implementing packet filtering and deep packet inspection functions to control the unauthorized traffic and malicious contents. Denial-of-Service (DoS) attack was considered as a potential cybersecurity issue that may threaten the data availability and integrity of DCS gateway servers. Logical design architecture was developed to simulate the behavior of functions flow. HDL-based physical architecture was modelled and simulated using Xilinx ISE software to verify the design functionality. For effective modelling process, enhanced function flow block diagrams (EFFBDs) and schematic design based on FPGA technology were together developed and simulated to verify the performance and functional requirements of network security controls. Both logical and physical design architectures verified that hardware-based cybersecurity controls are capable to maintain the data availability and integrity. Further works focus on implementing the schematic design to an FPGA platform to accomplish the design verification and validation processes.

• The Journal of Asian Finance, Economics and Business
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• 제7권12호
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• pp.969-976
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• 2020

The role of customers has changed from that of passive users to value co-creators. Therefore, it is important to understand how customer learning takes place and how it affects customer experiences with services and products. However, while past studies insist on the importance of the issues in designing customer experiences, they do not empirically address these issues. This study investigates the support processes for customer learning, and their impact on customer learning, which in turn influences customer experience. To test the hypotheses, we employed the survey method. Target informants were the actual users of Apple iPods. A total of 200 survey questionnaires were distributed and 146 were collected. Among these, seven erroneous responses were excluded, leaving 139 usable ones. The proposed model was empirically analyzed using the Covariance-based SEM (Structural Equation Modelling) technique. The findings of this study suggest that, among the three support processes in customer learning, learning-by-doing support and learning-by-investment support positively affect customer learning, which influences customer experience. This study contributes to the literature by identifying different types of support for different kinds of customer learning processes and by empirically testing the impact of the support for the process on customer learning, and in turn, its impact on customer experience.

• 한국경영과학회지
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• 제36권2호
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• pp.15-32
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• 2011

The research for exchange relationship in customer's perspective is meaningful especially in service, considering distinctive characteristics of service operations such as customer participation in the process whereas most of the recent related researches have been focused on employee's interaction with organization, leader, team and customer. In this study for beauty art service, the exchange party's characteristic is defined with beauty salon's reputation, staff's professionalism and customer's self-esteem. Also the exchange relation perception is classified into symbolism and interaction, Then the directional relations on customer's perspective are empirically investigated in the sequential order of the exchange party's characteristics, the exchange relation perception, the relationship quality and behavioral intention. In addition, the study examined the meditation effect via relationship quality between the exchange relation perception and the behavioral intention. Followings are confirmed from the statistical test with structural equation modelling：Symbolism is significantly caused by all of professionalism, reputation and self-esteem in the descending order of effect size whereas interaction is significantly influenced by only professionalism. The exchange relation perception has significant effect on the relationship quality, in turn which significantly affects behavioral intention. The exchange relation perception shows the significant indirect effect meditated by relationship quality and the insignificant direct effect on behavioral intention. This paper concludes with contribution of this study, managerial implication of the research findings and further research issues.

• 한국구조물진단유지관리공학회 논문집
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• 제14권2호
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• pp.89-96
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• 2010

이산화탄소에 의해 열화된 콘크리트 구조물의 보수 후 잔존수명을 평가할 때 보수재의 효과를 고려하기 위해 본 연구에서는 탄산화에 의해 열화를 받은 콘크리트 부재의 보수 후 재열화과정을 Fick's 확산(diffusion) 제1법칙을 이용하여 모델링함으로써 단면복구재에 의해 보수된 콘크리트 부재의 독특한 상황을 고려한 합리적인 예측식을 제시하였다. 연구결과는 보수재의 이산화탄소 확산 프로파일과 기존 구체콘크리트의 탄산화된 부분의 이산화탄소 확산 프로파일을 효과적으로 모델링할 수 있음을 보여줬다. 제시된 평가모델식에 대한 검증예제를 통해 보수재의 이산화탄소 확산지연효과를 확인할 수 있었으며 보수된 콘크리트 구조물의 보수 후 잔존수명을 객관적이고 수치계산적인 방법으로 평가할 수 있었다.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2005년도 춘계 종합학술대회 논문집
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• pp.422-428
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• 2005

본 논문에서는 멀티미디어 콘텐츠의 프리젠테이션 품질을 유지하기 위해 멀티미디어 콘텐츠를 처리할 때 발생하는 여러 사건들을 이벤트(event)로 정의하고, 각각의 특징에 따라 여러개의 클래스로 분류하였다. 그리고 이벤트의 처리와 관리에 의해 프리젠테이션 동기화를 처리할 수 있는 모델을 제안하였다. 또한, 쇼(show) 진행에 관련된 실행모듈, 스레드(thread) 등이 이벤트를 이용하여 상호 통신함으로써 프리젠테이션 서비스를 유지하는 방안에 대해 제안하였다. 특히, 제안된 모델에서는 사용자 인터페이스를 통해 사용자가 프리젠테이션 수행에 직접적으로 개입할 수 있을 뿐만 아니라 서비스 과정에서 발생하는 예측 불가능한 상태 변화에 대하여 능동적으로 대처함으로써 멀티미디어 문서의 프리젠테이션 품질을 유지할 수 있도록 하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권1호
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• pp.35-57
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• 2014

Multi-criteria decision making (MCDM) algorithms play an important role in ensuring quality of service in an integrated HetNets (Heterogeneous Networks). The primary objective of this paper is to develop a multi-criteria vertical handoff decision algorithm (VHDA) for best access network selection in an integrated Wireless Local Area Network (WLAN)/Universal Mobile Telecommunications System (UMTS)/Worldwide Interoperability for Microwave Access (WiMAX) system. The proposed design consists of two parts, the first part is the evaluation of an Analytic Hierarchy Process (AHP) to decide the relative weights of handoff decision criteria and the second part computes the final score of the weights to rank network alternatives using Simple Additive Weighting (SAW). SAW ranks the network alternatives in a faster and simpler manner than AHP. The AHP-SAW mathematical model has been designed, evaluated and simulated for streaming video type of traffic. For other traffic type, such as conversational, background and interactive, only simulation results have been discussed and presented in brief. Simulation results reveal that the hierarchical modelling and computing provides optimum solution for access network selection in an integrated environment as obtained results prove to be an acceptable solution to what could be expected in real life scenarios.

• Journal of Information Science Theory and Practice
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• 제11권3호
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• pp.1-15
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• 2023

The present study examines the impact of value co-creation on satisfaction and intention to adopt of e-resources among users. Four components of the DART model have been adopted to describe value co-creation. These components are dialogue, access, risk-assessment, and transparency. Ph.D. scholars and faculty members from National Capital Region, India, were requested to respond on a five-point Likert scale. A total of 220 responses were collected with the help of a structured questionnaire from respondents of the top 50 business schools according to National Institute Ranking Framework. These responses have been analysed by means of structured equation modelling on Adanco 2.2 software. Findings of the study reported the insignificant impact of access and risk-assessment, and positive impact of dialogue and transparency on satisfaction. Further, satisfaction has been identified, creating significant impact on adoption of e-resources. Such findings reflect the real picture of customer experience with respect to their role in co-creation of e-resources. Respondents have conveyed their dissatisfaction with the co-creation process of e-resources, as companies do not provide all the information and access to their customers beforehand. Consequently, customers fail to make informed decisions and also find themselves unable to show trust in the service providers of e-resources.

• Journal of Korea Trade
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• 제24권3호
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• pp.20-36
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• 2020

Purpose - As the global product network expands through both internationalization and diversification of the multimodal transportation system, corporate strategies have shifted to emphasize the importance of a high value-added international logistics system. To guide policies and strategies to attract relevant industries, this study aims to analyze the location competitiveness of regional logistics distribution center to serve Northeast Asia. Design/methodology - Multi-criteria techniques are considered to offer a promising framework for evaluating decision-making factors. This paper employed an analytic hierarchy process to analyze the hierarchal structure of determinants for selecting the location of a regional logistics distribution center. Adopting both qualitative and quantitative evaluations, this study suggest political implications for a regional logistics distribution center development, such as the direction of political support, service differentiation and infrastructure development. Findings - This study developed a location competitiveness evaluation model, based on the case study of the major port-cities in Northeast Asia. Evaluation model incorporates five factors underpinning 17 components extracted using factor analysis. The results revealed that the logistics factor is the most significant factor for evaluating the competitiveness of a regional logistics distribution center. The remaining factors were market, costs, and services environment. Comparing qualitative and quantitative evaluations, results provide useful insights for a regional logistics distribution center development in Northeast Asia. Originality/value - This study revealed differences between qualitative and quantitative evaluations. The finding implies that prior works on evaluation models of competitiveness has not successfully measured the gap between quantitative data and expert' evaluations. To overcome this limitation, this paper considered both actual data such as actual distance, cost, the number of companies located, and expert opinions.

• 한국해안·해양공학회논문집
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• 제27권4호
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• pp.246-257
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• 2015

피해 자료의 부족에 따른 불확실성 뿐만 아니라 시간의 진행에 따른 불확실성을 고려하기 위하여 추계학적 확률과정을 이용하여 시간에 따른 구조물의 피해 경로를 정량적으로 추적하였다. 누적피해도와 내구년수의 분포함수를 시간의 함수로 산정하여 추계학적 확률과정을 적용할 때 주의해야 하는 중요한 특성들을 제시하였다. 특히, 본 연구에서는 추계학적 확률과정을 경사제 피복재에 적용하여 시간에 따른 누적 피해도를 추적할 수 있는 방법을 제안하였다. 확률과정의 매개변수들을 추정하기 위하여 개발된 표본경로기법을 이용하여 경사제 피복재의 시간에 따른 누적 피해도가 포화거동을 따른다는 사실이 확인되었다. 또한 누적 피해도 산정시 중요한 역할을 하는 멱함수의 지수를 정량적으로 산정하여 경사제 피복재의 누적 피해도를 시간에 따라 추적하는 것이 가능했다. 마지막으로 한계수준을 다양하게 변화시키면서 파괴확률의 거동특성을 해석하였다.

• 한국재난관리표준학회지
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• 제2권2호
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• pp.63-68
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• 2009

신설된 교량의 경우 최근 개정된 도로교 설계기준에 의하여 내진설계를 수행하여 시공되고 있으나, 내진설계규정이 적용되기 이전에 시공되어 사용 중인 철근콘크리트 교각의 경우에는 지진에 의한 횡하중에 대해 취약할 수 있다. 따라서 본 연구에서는 교각의 내진보강을 위해 니켈-크롬 합금강바의 물리적 특성을 파악하고, 니켈-크롬 합금강바를 보강한 교각부의 지진에 의한 횡하중 작용시의 거동을 MIDAS프로그램을 통해 모델링하여 내진보강 전후의 교각 변위와 응력변화를 비교, 검토하였다. 이와 같은 연구를 통해 니켈-크롬 합금강바가 다른 보강재에 비해 경제적인 면과 기능적인 면을 모두 만족시킬 수가 있음을 알 수 있었고, MIDAS프로그램을 이용한 모델링을 통해 니켈-크롬 합금 강바의 내진보강 효과를 확인할 수가 있었다.