• Composites Research
• /
• 제19권2호
• /
• pp.1-6
• /
• 2006

복합재료를 사용하여 우주항공 부품을 설계할 때 국내는 물론, 미국을 비롯한 우주항공선진국의 감항규정에서 민간과 군용 모두 통계적으로 산출된 값을 사용할 것을 요구하고 있다. 그러나 이 기준을 만족하기 위해서는 방대한 데이터베이스가 필요하여 시험 비용 및 시간이 큰 문제가 되어왔다. 최근 미국 NASA/FAA에서 시험 개수를 줄이면서 동시에 통계적 기준을 만족할 수 있는 새로운 설계허용값 산출방법을 AGATE 프로그램을 통해서 개발하였다. 특히 이미 인증된 재료를 다른 사업에 사용하기 위해서 사용할 수 있는 재료동등성 시험(Material Equivalency Test)은 국내의 사업에 직접 적용할 수 있는 중요한 개념이다. 본 논문에서는 국내에서 사용하고 있는 복합재료의 특성을 공유하여 비용을 절감하고 재료특성을 정확히 관리할 목적으로 재료 동등성 및 수락시험 절차를 설명하고, 예로서 국내에서 개발한 고온용 탄소복합재료의 설계허용값을 산출하였다.

• 디지털콘텐츠학회 논문지
• /
• 제10권4호
• /
• pp.501-507
• /
• 2009

인트라넷 네트워크상 에서의 응답시간 단축은 정보제공 효율성을 확보하는 기본요소이다. 그동안 네트워크상에서 응답시간 단축을 실현하기위해 많은 방법론들이 연구되고 제안 되었다. 이같은 연구의 목적은 응답시간 단축 메커니즘 구현을 통해 단축된 빠른 응답시간 내에서 신속성을 생명으로 하는 정보시스템 본래의 목표실현이 가능하기 때문이다. 네트워크를 활용하는 정보시스템에서 최종적인 목표는 요구되는 시간내에 목적하는 성능을 확보하는 것이다. 이를 위해서 정보시스템 네트워크 응답시간 측정방법을 연구개발 하므로서 단축된 응답시간 보증방법 개발이 가능해진다. 본 논문에서는 latency 테스트 결과를 참조하는 인프라시스템에서 응답시간 측정 방법론을 제안한다. 본 연구에서 제안한 방법론을 통해 체계적인 측정환경을 설계하여 응답시간 측정이 가능함이 입증되었고 응답시간측정 메카니즘을 통해서 개선된 네트워킹 기능과 정보시스템 기능을 위한 효율성제고 방법론 개발이 가능함을 보여주고 있다.

• Nuclear Engineering and Technology
• /
• 제49권5호
• /
• pp.989-995
• /
• 2017

Distributed Control System (DCS) communication networks, which use Fast Ethernet with redundant networks for the transmission of information, have been installed in digitalized nuclear power plants. Normally, failover tests are performed to verify the reliability of redundant networks during design and manufacturing phases; however, systematic integrity tests of DCS networks cannot be fully performed during these phases because all relevant equipment is not installed completely during these two phases. In additions, practical verification tests are insufficient, and there is a need to test the actual failover function of DCS redundant networks in the target environment. The purpose of this study is to verify that the failover functions works correctly in certain abnormal conditions during installation and commissioning phase and identify the influence of network failover on the entire DCS. To quantify the effects of network failover in the DCS, the packets (Protocol Data Units) must be collected and resource usage of the system has to be monitored and analyzed. This study introduces the use of a new methodology for verification of DCS network failover during the installation and commissioning phases. This study is expected to provide insight into verification methodology and the failover effects from DCS redundant networks. It also provides test results of network performance from DCS network failover in digitalized domestic nuclear power plants (NPPs).

• Asian Journal for Public Opinion Research
• /
• 제9권2호
• /
• pp.188-211
• /
• 2021

Decreasing response rates to traditional survey methods, like face-to-face and telephone interviews, have led survey practitioners around the world to seek new ways of conducting surveys in recent years." The COVID-19 pandemic exacerbated this problem because it made conducting face-to-face interviews even more difficult than before. For example, it made conducting face-to-face surveys infeasible in 2020 in South Korea, and so the Korean Academic Multimode Open Survey (KAMOS) was unable to conduct a planned face-to-face survey to recruit new panel members. The entire 8,514-member panel, established via two-stage probability-based sampling from 2016 to 2019, was invited to take three online/telephone surveys in 2020. Of these panel members, 1,352 responded to at least one survey in 2020. To test to what extent the panel remained representative of the adult South Korean population, we compared the two groups of panel members: those who responded to at least one survey in 2020 and those who did not. After weighting both groups on the basis of age, sex, and geographical area, we analyzed their responses to some of the questions that were asked during multiple rounds of the face-to-face panel-recruiting interviews. Using Cohen's d for survey items that could be analyzed numerically and Cramér's V for categorical items, we were able to conclude that the respondents to the 2020 surveys were equivalent to the non-respondents in terms of both demographics and in the answers they originally gave to substantive questions on a variety of topics related to social science or public opinion research, including questions about quality of life, societal issue, and politics (Cohen's d items <0.2, 95% CI; Cramér's V items <0.1, 95% CI). This analysis may provide a model for others who wish to test the continued representativeness of their panel or who would like to use a different survey mode or change some other aspect of their methodology and test whether it is equivalent to their former methodology. Our success in building a panel that retained its representativeness may be useful to those in other countries where face-to-face surveys had previously been the norm but are becoming increasingly difficult to conduct.

• 한국콘텐츠학회논문지
• /
• 제10권6호
• /
• pp.156-165
• /
• 2010

국내에선 ESM(Enterprise Security Management)이 보안관리를 대표하고 있고, 이를 더욱 고도화해야 한다는 요구가 증가하고 있다. 본 논문에서는 기업보안관리(ESM) 제품의 질적인 면을 평가하고 품질 수준을 파악하여 개선방향을 도출함으로써 품질향상을 지원할 수 있는 보안성 평가모델과 시험 방법론에 대해서 개발하였다. 그리고 제품의 보안성 품질을 측정하고 그 결과를 적절한 기준에 따라 판정하는 방법에 대해 연구를 수행하고자 성능시험사례를 제시하여 평가방법을 제시하였다. 도출된 품질평가 모델은 침입방지 시스템의 품질을 평가하고 향상시키는데 중요한 역할을 하게 될 것으로 기대한다.

• 디지털융복합연구
• /
• 제7권4호
• /
• pp.149-158
• /
• 2009

Although current RFID technologies can provide wide advantages in food industry area, most food companies do not consider willingly adopting this technology yet. This paper will present how the effective implementation of RFID systems in food industry could be realized. To Measure the importance of RFID systems, this study utilized the BMT(Bench Mark Test) methodology using RFID systems that were composed of tag and reader. After conducting this study, it suggests the effective tag attachment methods on the objects. The results are shown that the excellent tag product is a RFCamp and a fixed reader of Thingmagic Mercury 4 is the best product. Also, a portable reader of Motorola MC9090-RFID is recommend to the highest product. Therefore, this test is useful for selecting the best RFID systems to the food industry area. In addition, this study displays the effective tag attachment method to each bottle that was used to the experiments in food industry. Therefore, this study is contributed to the not only importance in the government IT areas as a growth engine but also the importance for consumer as a right for the knowledge about the food quality.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
• /
• 제7권4호
• /
• pp.288-298
• /
• 2001

소프트웨어 프로세스에 관한 표준을 각 프로젝트에서 이용하기 위해서 개발 도메인에 맞도록 테일러링하는 작업이 필요하다. 그러나 기존의 테일러링 작업은 체계적이지 않고, 개발 도메인과 방법론의 분석 없이는 불가능하며 유사한 다른 프로젝트로의 적용도 쉽지 않다. 본 논문에서는 "컴포넌트 기반 개발 개념을 활용한 테일러링 방안" 을 기반으로한 체계적인 테일러링 단계와 테스트 프로세스 생성 자동화 알고리즘을 제안하고, XML을 이용하여 구현한 “테일러링 방안의 자동화 도구, AutoTP”를 제안한다. AutoTP 사용자는 프로세스 표준이나 방법론과 도메인을 분석하는 등의 작업 없이도 특정 개발 도메인에 적합한 테스트 프로세스를 자동생성할 수 있다.

• Nuclear Engineering and Technology
• /
• 제53권10호
• /
• pp.3319-3326
• /
• 2021

As a form of industrial control systems (ICS), nuclear instrumentation and control (I&C) systems have been digitalized increasingly. This has raised in turn cyber security concerns. Cyber security for ICS is important because cyber-attacks against ICS can cause not only equipment damage and loss of production but also personal and public safety hazards unlike in general IT environments. Numerous risk analyses have been carried out to enhance the safety of ICS and recently, many studies related to the cyber security of ICS are being conducted. Many existing risk analyses and cyber security studies have considered safety and cyber security separately. However, both safety and cyber security perspectives should be considered when analyzing risks for complex and critical ICS facilities such as nuclear power plants (NPPs). In this paper, the STPA-SafeSec methodology is selected to consider both safety and security perspectives when performing a risk analysis for NPPs in order to assess impacts on the safety by cyber-attacks against the digital I&C systems. The STPA-SafeSec methodology was applied to a test-bed system that simulates a condensate water (CD) system in an NPP. The process of the application up to the development of mitigation strategies is described in detail.

• 식품과학과 산업
• /
• 제52권1호
• /
• pp.20-31
• /
• 2019

Sensory perception of food/beverage products is one of the most important quality factors to determine consumer acceptability and thus sensory discrimination methodology has been a vital tool for quality management. Signal detection theory(SDT) and Thurstonian modeling provide the most advanced psychometric approach to modeling various discrimination methods. In these theories, perceptual and cognitive decisional factors are considered so that, a fundamental measure of sensory difference (d') can be computed, independent of test methods used. In this paper, sensory discrimination analysis based on SDT and Thurstonian modeling is introduced for more accurate and systematic applications of sensory and hedonic quality management in industry. Ways to realize the statistical power and relative sensitivity of sensory discrimination methods theorized in SDT and Thurstonian modeling in practice, are also discussed by using a case study of the Nongshim quality management program for drinking water in which SDT A-Not A test methodology was further optimized.

• 한국컴퓨터정보학회논문지
• /
• 제27권3호
• /
• pp.127-135
• /
• 2022

이 연구의 목적은 중등체육교원 임용고사 육상실기평가에 대한 예비체육교사의 인식을 탐색하는데 있다. 이를 위해 인간 내면의 감정, 의견, 인식 등을 탐색할 수 있는 Q방법론을 활용하였다. 분석결과 3가지 유형이 탐색되었고, 각 유형은 전문시설지원요구형과 전문기술지도요구형 그리고 평가방법개선요구형으로 명명되었다. 결론으로, 중등체육교원 임용고사 육상실기평가를 준비하는데 있어 예비체육교사들은 전문시설의 지원과 전문기술을 지도받을 수 있는 기회의 제공 그리고 평가 방법과 절차에 대한 구체적인 사전 안내 등을 희망하는 것으로 해석되었다.