• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.5
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• pp.1211-1221
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• 2016

In IoT environment, making sure of trust of IoT devices is the most important one than others. The security threats of nowadays almost stay at exposure or tampering of information. However, if human life is strongly connected to the Internet by IoT devices, the security threats will probably target human directly. In case of devices, authentication is verified using the device-known private key. However, if attacker can modify the device physically, knowing the private key cannot be the evidence of trust any more. Thus, we need stronger verification method like code attestation. In this paper, we use software-based code attestation for efficiency. We also suggest secure code attestation method against copy of original code and implement it on embedded device and analyze its performance.

• The Journal of the Acoustical Society of Korea
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• v.28 no.3
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• pp.279-284
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• 2009

Speaker verification determines whether the claimed speaker is accepted based on the score of the test utterance. In recent years, methods based on Gaussian mixture models and universal background model have been the dominant approaches for text-independent speaker verification. These speaker verification systems based on these methods provide very good performance under laboratory conditions. However, in real situations, the performance of speaker verification system is degraded dramatically. For overcoming this performance degradation, the feature recombination method was proposed, but this method had a drawback that whole sub-band feature vectors are used to compute the likelihood scores. To deal with this drawback, a modified feature recombination method which can use each sub-band likelihood score independently was proposed in our previous research. In this paper, we propose a sub-band weighting method based on sub-band signal-to-noise ratio which is combined with previously proposed modified feature recombination. This proposed method reduces errors by 28% compared with the conventional feature recombination method.

• Proceedings of the KIEE Conference
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• 2001.07a
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• pp.318-322
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• 2001

본 논문은 뉴로-퍼지 모델의 구조 학습을 이용한 단기 전력 수요 예측시스템에서 예측치별로 신뢰도를 계산하는 체계적인 방법을 제안한다. 예측시스템의 신뢰도를 추정하는 작업은 특히 신경회로망과 같은 경험적 모델을 실제 활용하기 위해서 필수적인 연구로 인식되고 있다. 본 논문에서 제안하는 출력별 신뢰 구간 계산 방법은 지역 표현하는 뉴로-퍼지 모델의 특성을 활용하여 학습된 퍼지 규칙 각각에 대해 신뢰도를 추정하는 Local reliability measure 기법을 사용한다. 제안된 신뢰도 계산이 가능한 단기 전력 수요 예측시스템은 먼저 결정 트리를 이용하여 초기 구조를 생성하고, 이를 초기 구조 뱅크에 저장한다. 저장된 초기 구조 뱅크를 이용하여 뉴로-퍼지 모델을 학습하고, 학습된 퍼지 규칙의 신뢰도를 추정한다. 제안된 시스템의 실효성을 검증하기 위해서 한국 전력에서 수집한 1996년과 1997년의 실제 전력 수요 데이터를 이용하여 한 시간 앞의 수요를 예측하는 모의 실험을 수행하고 실험 결과를 비교 분석한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.3
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• pp.61-66
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• 2002

Electric power distribution networks are prime examples of systems where a very high degree of reliability is expected. Reliability is the probability of a device or system performing its function adequately for the period of time intended and intented operating conditions intented. This paper shows that a better meshed distribution configuration over the case study of radial configuration distribution system was selected by comparing the indices obtained from EDSA\`s reliability worth assessment of distribution systems program.

• Journal of the Korean School Mathematics Society
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• v.9 no.3
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• pp.405-424
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• 2006

The purpose of this study was to develop the instruments which can measure behavior characteristics as a component of Mathematically Giftedness with in middle school period. This study prescribed the variable factors of measurement after classify the characteristics of Mathematically Giftedness through literature studies. And it produced instruments those are finally composed of 51 items through the preliminary test. The participants for the study were 424 Korean middle school students. Statistical analyses were carried out to verify the validities and reliability. Reliability(Cronbach $\alpha$) was in behavior characteristics, .95. Content validity was found to be satisfactory by internal validity evaluation on the test items. Internal validity were analyzed by BIGSTEPTS based on Rasch's 1-parameter item-response model. Construct validity was also found to be satisfactory through factor analysis which showed the four factors which the identification instruments were intended to measure such as, General mathematical mental ability, Mathematical Ability, Processing and Obtaining mathematical information Anility and Mathematical Disposition Ability. In conclusion, the instruments about behavior characteristics of Mathematically Giftedness during middle school period developed by this study are highly reliable on its reliability and validity.

• Culinary science and hospitality research
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• v.19 no.5
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• pp.87-99
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• 2013

This research was intended to investigate the influence of relationship quality by servicescape of Korean restaurants on loyalty targeting Busan city area. For this, a research model was designed and hypotheses were drawn through literature investigation. 300 copies of the questionnaire for a survey were distributed from 6th to 24th of May, 2013, and then 288 copies were adopted for the empirical analysis. As for data processing, the data were analyzed by using SPSS win version 18.0 statistics package program and were verified through frequency analysis, reliability analysis, factor analysis, and regression analysis. The result of this empirical study was summarized as follows. First, as a result of verifying the influence of servicescape factors on relationship quality, cleanliness, comfortableness, and accessibility among the servicescape factors had significant effects on commitment among the quality factors. Second, the result from verifying how the servicescape factors affected trust showed that attractiveness, comfortableness, and accessibility had significant effects on trust. Third, commitment and trust among the relationship quality factors were found to have significant effects on loyalty.

• Education of Primary School Mathematics
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• v.21 no.4
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• pp.431-444
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• 2018

The purpose of this study was to develop and validate a mathematics anxiety scale for elementary students in South Korea. Based on the literature review, I developed two types of survey items measuring elementary students' mathematics anxiety. Teachers or students may use survey measurements selectively according to the students' participants in mathematics private institutions. In order to assess the reliability and validity of survey items, I conducted surveys with elementary students. The sample consisted of 300 elementary students in public elementary schools in Seoul. A total of 28 items were developed and examined for the internal consistence. The results showed that the proposed scale was appropriate to represent the mathematics anxiety of elementary students. The survey items of this study could be applied for assessing elementary students' mathematics anxiety regardless of their gender and age factors.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.4
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• pp.119-126
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• 2006

In order to improve voters' reliability in electronic voting system, voter verifiable receipt technique is being actively researched. Since the receipt should be verifiable not only inside but also outside a polling place, it satisfies the requirements, individual verifiability and receipt-freeness. In the previous researches, there are some problems that special paper and printer is necessary or frequent monitoring is needed to confirm the voting machine's trustworthiness. In this paper, we propose a new receipt issuing scheme. Our scheme does not require any special equipments such as special paper and printer or optical scanner. In addition to that it does not require voters to trust any devices in the polling station and there is no need of frequent observations to the voting machines.

• Journal of Korean Society of Archives and Records Management
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• v.22 no.4
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• pp.45-65
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• 2022

YouTube videos of public institutions are digital public records that need to be managed and preserved. As such, the video and the metadata describing the video should also be preserved. This study aims to select the key metadata elements necessary for archiving videos published on YouTube by public institutions. To this end, five high-level areas, namely the description, structure, management, preservation, and user participation, and the metadata elements of 10 subareas, were designed by referring to NAK 8, PREMIS, ISAD(G), and YouTube metadata. Afterward, the metadata elements designed by 14 experts were verified. Lastly, the validity and reliability of the evaluation results were verified. Of the 63 elements, 33 satisfied the validity and reliability criteria. Thus, these elements were selected as the core metadata for archiving YouTube videos in public institutions.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.3
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• pp.895-905
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• 2018

Public opinion polls have a strong influence on modern society as a means of examining the tendency of social groups on specific issues. As the influence of the polls increases, the problem of forgery and falsification of the results becomes an important issue. So, to guarantee the reliability of the results, our society needs novel mechanisms. As one of such mechanisms, the Ethereum blockchain is an environment for developing decentralized applications with the reliable blockchain technology. Ethereum decentralized applications can utilize smart contracts to provide services for users in transparent and reliable ways. In this paper, we propose a polling method that guarantees reliability using the blockchain technology, which is a distributed ledger technique that makes forgery or falsification actually impossible. The proposed method provides a robust verification function on the results of the associated polls for individual voters and verification organizations. Also, we present a distributed opinion polling application running on our private Ethereum blockchain network, showing the effectiveness of the proposed method.