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데이터 증강기법을 이용한 음성 위조 공격 탐지모형의 성능 향상에 대한 연구
최효정,곽일엽,Choi, Hyo-Jung,Kwak, Il-Youp 한국통계학회 2021 응용통계연구 Vol.34 No.3
본 논문에서는 음성위조공격탐지(Voice spoofing detection) 문제에 데이터 증강을 적용한다. ASVspoof 2017은 리플레이 공격 탐지에 대해 다루며 진짜 사람의 음성과 환경이나 녹음·재생 장치의 조건들을 다르게 하여 위조한 가짜 음성을 분류하는 것을 목적으로 한다. 지금까지 이미지 데이터에 대한 데이터 증강 연구가 활발히 이루어졌으며 음성에도 데이터 증강을 시도하는 여러 연구가 진행되어왔다. 하지만 음성 리플레이 공격에 대한 데이터 증강시도는 이루어지지 않아 본 논문에서는 데이터 증강기법을 통한 오디오 변형이 리플레이 공격 탐지에 어떠한 영향을 미치는지에 대해 탐구해본다. 총 7가지의 데이터 증강기법을 적용해보았으며 그 중 DVC, Pitch 음성 증강기법이 성능향상에 도움되었다. DVC와 Pitch는 기본 모델 EER의 약 8% 개선을 보여주었으며, 특히 DVC는 57개의 환경변수 중 일부 환경에서 눈에 띄는 정확도 향상이 있었다. 가장 큰 폭으로 증가한 RC53의 경우 DVC가 기본 모델 정확도의 약 45% 향상을 이끌어내며 기존에 탐지하기 어려웠던 고사양의 녹음·재생 장치를 잘 구분해냈다. 본 연구를 토대로 기존에 증강기법의 효과에 대한 연구가 이루어지지 않았던 음성 위조 탐지 문제에서 DVC, Pitch 데이터 증강기법이 성능 향상에 도움이 된다는 것을 알아내었다. ASVspoof 2017 deals with detection of replay attacks and aims to classify real human voices and fake voices. The spoofed voice refers to the voice that reproduces the original voice by different types of microphones and speakers. data augmentation research on image data has been actively conducted, and several studies have been conducted to attempt data augmentation on voice. However, there are not many attempts to augment data for voice replay attacks, so this paper explores how audio modification through data augmentation techniques affects the detection of replay attacks. A total of 7 data augmentation techniques were applied, and among them, dynamic value change (DVC) and pitch techniques helped improve performance. DVC and pitch showed an improvement of about 8% of the base model EER, and DVC in particular showed noticeable improvement in accuracy in some environments among 57 replay configurations. The greatest increase was achieved in RC53, and DVC led to an approximately 45% improvement in base model accuracy. The high-end recording and playback devices that were previously difficult to detect were well identified. Based on this study, we found that the DVC and pitch data augmentation techniques are helpful in improving performance in the voice spoofing detection problem.
ADHD 경향 초등학생의 영어 학습에 멀티미디어 활용 수업이 미치는 효과
최효정(Choi, Hyo-jung),임정완(Lim, Jeong-Wan) 한국영어어문교육학회 2011 영어어문교육 Vol.17 No.2
The purpose of this study is to investigate the effects of multimedia-assisted language learning on vocabulary learning and attention for elementary school students who are ADHD-prone. Among thirty-three students attending a private English academy in Daegu, four students who were prone to develop ADHD were chosen for this study. They were observed in a multimedia-assisted language learning class for four months and they were given a series of tests designed to measure their attention period and vocabulary ability. The results of the study are as follows. First, studying English by using multimedia was effective in improving the attention of those children prone to develop ADHD. Second, studying English through multimedia was effective in improving their vocabulary ability. Based on the findings, some pedagogical suggestions have been made for further study.
최효정 ( Hyo Jung Choi ),홍선아 ( Seon Ah Hong ),정정희 ( Chung Hee Chung ) 미래유아교육학회 2013 미래유아교육학회지 Vol.20 No.3
The Purpose of this study was to examine the differences of child`s referential opacity understanding based on age, and to explore the relationships among referential opacity understanding, reasoning ability, and working memory. This study was to investigate how 5-7 children develop conception of referential opacity understanding. The subject of this study were 118 children 5-to 7-year old children. Instruments were opacity task, K-Raven cpm (Korea-Raven coloured progressive matrices), digit-span subtests of the K-WISC-Ⅲ Test of Intelligence. The major results of this study were as follows. First, there were significant differences in child``s referential opacity understanding by age; older children understood the referential opacity better than younger children. Second, reasoning ability, and working memory had positive correlations with referential opacity understanding. In addition, reasoning ability and working memory taking had a significant effect on referential opacity understanding. Third, chi square test showed significant differences in referential opacity development-type according to age.
최효정(Hyo Jeong Choi),김호중(Ho Jung Kim),이효주(Hyo Ju Lee) 위기관리 이론과 실천 2020 Crisisonomy Vol.16 No.3
최근 폭염 위험성이 매년 갱신되고 있어, 각 국가마다 현실적 대안마련이 촉구되고 있다. 이에 실행가능한 해결방법을 간구하려는 노력이 계속 되고 있지만 실제로 온열질환에 대처하는 현장처치 도구가 부족하고 구체적인 처치 도구에 관련된 연구도 거의 없다. 따라서 저자들은 온열질환과 관련한연구들을 검토하여, 이에 대한 해결책을 구체적으로 알아보고자 하였다. 온열질환과 관련된 문헌을통해 신속한 처치가 가능한 방법을 5가지(열차단법, 의복 등 제거법, 체온감소법, 수분 섭취 및 흡수법, 기타)로 정의하여 효과를 분석하였다. 연구결과 열차단법에서 열 차단막이 설치된 곳의 지표온도가 평균 7.9℃가량 낮은 것으로 나타났고, 의복 등 제거술을 위한 방법에서 보조자가 없는 경우가위가 칼에 비해 제거속도가 빨랐다(Scissor 2.8±1.7 min, vs Knife 4.1±2.3 min., p<0.05). 수분 섭취만족도는 전체적으로 이온음료와 물이 소금물에 비해서 높게 나타났다(94±10 vs. 86±9 vs. 28±19, p<0.05). A growing risk of heat wave has forced the countries to come up with realistic and viable solutions. Despite a lack of on-site treatment tools to deal with heat-related diseases, few studies have examined this issue. We aim to examine the literature related to thermal damage to find out solutions to this problem. The literature related to heat-related diseases suggested five methods for rapid treatment and analyzed the effects of each treatment option. It is found that the average temperature of the surface of the terrain is about 7.9°C lower with heat shield. As for the method of clothing removal, the use of scissors was faster than the use of knives in the absence of a helper (scissor 2.8±1.7 min. vs. knife 4.1±2.3 min., p<0.05). Overall, ion drinks or water was found to provide a higher satisfaction than salt water according to the water intake satisfaction survey (94±10 vs. 86±9 vs. 28±19, p<0.05).