• Korean Security Journal
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• no.16
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• pp.47-64
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• 2008

The purpose of this study is to develop the measurement of security needs satisfaction from users of electronic security system, to verify its validity and reliability, and by applying them, to examine the effects between the communities using this system. In 2008, the users of electronic security system in big cities in Seoul(Yong-San, Jong-Lo) and Gyung-Gi Do(Su-Won) for their convenience stores, jewelry shops, communication services, banks, government and public offices, etc. were arranged for a population and 262 of them were used for the final analysis by purposive sampling. This study yields following results. First, the validity of security need satisfaction from users of electronic security system is very high, which means the explanatory adequacy of environmental security need is the highest. Second, the reliability of security need satisfaction from users of electronic security system is very high, in which the reliability value(Cronbach's $\alpha$) of internal consistency is over .765. Third, the security need of electronic security system has the most effects on the group of bank workers. That is, through a close cooperative system between the bank and the service of electronic security system, the more keeping satisfied the environmental, bodily, physical security needs are, the less the in security of this group has. Informational security need has the most effects on convenient store group. It means the service companies of electronic security system offer more services at dawn time and make or supply all sorts of visual information system, which reduces insecurity of the convenient store group.

• Journal of Convergence for Information Technology
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• v.11 no.12
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• pp.148-157
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• 2021

This research aims to adapt and evaluate the validity and reliability of the Korean version of the Interdisciplinary Education Perception Scale (K-IEPS). The original IEPS was translated into Korean according to the World Health Organization's guidelines. A total of 302 questionnaires were collected from healthcare professional students at 4 universities in South Korea. The validity and reliability of the scale were measured using Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), Cronbach's alpha, and Intraclass Correlation Coefficient (ICC). As a result of the factor analysis, a ten-item scale with two factors (Competency & Autonomy and Perception of Actual Cooperation) was achieved. Additionally, the Cronbach's alpha coefficient was found to be .87, and test-retest reliability was .83. Our study results show that the Korean version of the IEPS is a valid and reliable instrument. Therefore, the K-IEPS can be used in measuring interdisciplinary perceptions of healthcare professional students between different occupational groups.

• Korean Journal of Culture and Social Issue
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• v.24 no.3
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• pp.385-410
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• 2018

Materialistic values can be a important variable to understand Koreans' psychological well-being and mental health. This study aimed to validate the Korean version of the Material Values Scale (K-MVS)(Richins & Dawson, 1992). In study 1, we performed confirmatory factor analysis(CFA) to ascertain the three factor model of the original MVS using 417 Korean undergraduate student data(sample 1). The CFA confirmed the three-factor model of the MVS. Yet, three items that yielded low factor loadings in this study as well as in other MVS validation studies were excluded from the final model. In study 2, content, construct, and concurrent validity of the K-MVS were examined with 650 undergraduate student data(Sample 2). We also tested measurement invariance across two groups(i.e., college student group of Sample 2 and employee group of Sample 3). The result revealed that the three-factor model of the K-MVS hold true across the two groups. Lastly test-retest reliability was calculated with 408 female college student data(Sample 4) that filled out K-MVS twice within 6 months. These findings suggest that the K-MVS is a reliable and valid measure for assessing materialistic values in Korea.

• Journal of IKEEE
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• v.19 no.3
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• pp.431-439
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• 2015

This paper introduces analysis technique and test procedure for verifying the reliability of the multi-function radar software. Also the process of software development and reliability test method for reducing the development period are described. Test results show that the verified software has reduced errors and improved reliability compared to the unverified software.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.608-611
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• 2012

소셜 사건이 일어나면 그 사건과 관련된 트윗이 폭발적으로 증가하는데 트윗 일부 내용을 살펴보면 스팸, 광고와 같은 트윗이 많이 포함되어 있다. 수 많은 트위터 데이터에서 사용자가 사건과 직접 관련된 신뢰성 높은 트윗을 찾아 읽는데 시간이 많이 걸릴 수 있다. 이러한 문제를 해결하기 위해 본 논문에서 트위터의 리트윗 정보, 사용자 신뢰도 측정 및 활동 분석, 팔로잉과 팔로워간의 정보 등 사용자의 행동 분석을 이용하여 소셜 사건과 직접 관련된 신뢰성 높은 사용자의 트윗을 추출하는 방법을 제안한다. 제안 방법의 유효성을 검증하기 위해 소셜 이슈 4 개에 대한 트윗 데이터에서의 실험을 통하여 상위 100 개의 결과에서의 정확률(P@100) 76.6%의 성능을 보였다. 실험을 통해 제안 방법이 신뢰성 높은 사용자의 트윗을 추출하는데 효과적인 방법임을 알 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.273-276
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• 2021

최근의 기계 학습 (딥러닝)은 기존의 전통적인 통계 분석 방법들에 비해 효율성과 정확도가 높은 장점이 있지만, 처리과정이 블랙박스와 같아 결과 값의 중요한 원인 또는 근거 요인을 찾기 어렵다는 단점을 가지고 있다. 이를 해결하기 위한 최근의 XAI (eXplainable AI) 연구를 기반으로 하여, 본 논문에서는 의료기관에서 전정기관의 이상을 판별하기 위해 수작업으로 이루어지고 있는 HIT (head impulse test) 테스트 결과를 자동화하고, 설득력 있는 신뢰도 검정을 위해, XAI 기반 DoWhy 프레임 워크를 사용하였다. 전정기관 이상으로 의심되는 환자의 동공 움직임을 optical flow 로 추적하고, 정상인과의 Wasserstein metric 의 DoWhy 검증을 통해 전정기관 이상 여부의 신뢰도 구간을 검정한다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.190-192
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• 2005

PKI(Public Key Infrastructure)에서 인증서 상태 검증은 네트워크 환경에서의 거래에 신뢰성과 안전성 및 기밀성, 무결성 등의 서비스를 제공한다. 인증서 검증 방식은 CRL, OCSP, SCVP, DVCS 등이 있다. CRL은 시간이 지남에 따라 CRL의 크기가 증가하여 검증 시간이 지연되고 실시간 검증을 할 수 없는 단점을 가지고 있다. OCSP는 CRL을 이용하지 않고 거의 실시간에 가깝게 인증서를 검증하지만 서버의 부하 증가와 느린 검증 등의 단점을 가지고 있다. 분산 OCSP는 OCSP 서버를 분산시킨 후 CRL을 중복하여 보관하거나 분개하여 보관한 상태에서 검증하는 방식으로 대리검증에 따른 느린 검증과 CA의 부하부담 등의 단점을 가지고 있다. 본 논문에서는 제기된 단점들을 해결하여 빠른 검증과 부하 분산 효과를 얻을 수 있도록 분산된 OCSP 서버를 그룹으로 분류하고, 그룹 내의 각 서버에 인증서 폐지 정보를 중복 저장하여 부하분산, 빠른 검증, CRL을 Delta CRL 방식으로 OCSP 서버에 전송하여 네트워크 부하를 감소할 수 있도록 그룹 분산 OCSP 방식을 제안하고자 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.1
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• pp.59-67
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• 2003

PMI(Privilege Management Infrastructure) certificates as well as Public-Key certificates must be validated before being used. Validation for a PMI certificate requires PMI certificate path validation, and PKC(Public-Key Certificate) path validations for each entity in the PMI certificate path. This validation work is quite complex and burdened to PMI certificate verifiers. Therefore, this paper suggests a delegated PMI certificate validation that uses specialized validation server, and defines a validation protocol which is used between validation server and client.

• Journal of Korean Home Economics Education Association
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• v.29 no.1
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• pp.35-56
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• 2017

The purposes of this study were to develop an instrument to examine the latent domains to measure H-PCK and verify the reliability and validity of the instrument. To accomplish these purposes, instrument item development, content validity, pilot study, and main study were conducted. The results were as follows. First, based on a review of extant literature, 29 items for H-PCK were developed. Seven items were deleted from the original instrument after determining content validity by 10 in-service Home Economics teachers, which resulted in the 22 items of 3 domains(Knowledge of perspective on Home Economics Education(KP), Knowledge of Home Economics curriculum(KC), Knowledge of Home Economics instructional strategies(KI)). Second, data were collected from 137 Home Economics teachers via mail survey for pilot study to establish reliabilities for each individual domain and across the domains based on Cronbach's ${\alpha}$ and item-total correlation. The result showed good reliabilities in the cut-off value of .7 and .5 for Cronbach's ${\alpha}$ and for item-total correlation respectively. Third, the main study was performed with 220 Home Economics teachers via e-mail survey and the reliability and validity tests were conducted. The reliability test results showed good reliabilities. The model for confirmatory factor analysis(CFA) provided a good fit to the data (e.g., CFI=.92, RMSEA=.06, SRMR=.05) to evaluate construct validity. The three domains of KP, KC, and KI demonstrated the acceptable convergent and discriminant validities in each individual domain and over domains. Thus, the instrument in this study may be utilized to measure H-PCK. Finally, criterion-related validity was performed to examine the extent to which the three domains are related to teacher efficacy with Pearson correlation (${\rho}$). It was relatively highly correlated at ${\rho}=.7$. In addition, the higher H-PCK the Home Economics teachers had, the higher teacher efficacy they had. The final instrument consisting of 22 items from 3 domains were determined through the entire procedure.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.759-776
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• 2009

This paper aims at identifying trust factors to be managed in UCC environment, and how those trust factors impact on trust in UCC site. Also this paper examines the moderating effect of level of UCC participation(UCC retrieve, UCC production) on the relation between trust in UCC site and intention to use. For this purpose, we identified information, system, service, and site trust through intensive review of prior researches and some expert interviews. A total 338 surveys were used to analyze research hypothesis. The findings show that information, system, and service trust is positively and significantly related to site trust, and then site trust has impact on UCC usage. But, It is proven that there is no difference in effect of site trust on UCC usage according to level of UCC participation.