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

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.

온열질환 응급처치 대비를 위한 물품 조사

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).

보육교사의 회복탄력성과 직무만족에 관한 연구

최효정(Choi, Hyo-Jung),석은조(Seok, Eun-Jo) 한국영유아보육학회 2013 한국영유아보육학 Vol.0 No.75

본 연구에서는 보육교사의 개인적 특성에 따른 회복탄력성과 직무만족도의 전반적인 양상을 알아보고, 보육교사의 회복탄력성에 대한 직무만족도의 설명력이 어떠한지를 알아 보고자 한다. 연구대상은 경북지역에 소재한 어린이집에 근무하는 보육교사 204명을 대상으로 회복탄력성과 직무만족도를 설문조사하였으며 수집된 자료는 보육교사의 개인적 특성에 따른 회복탄력성과 직무만족도의 차이를 알아보기 위하여 독립표본 t 검증과 F 검증을 실시하였고, 사후검증을 위해 Scheffe 검증을 실시하였다. 보육교사의 회복탄력성에 대한 직무만족도의 설명력을 알아보기 위하여 단계적 중다회귀분석(stepwise multiple regression analysis)을 실시하여 분석하였다. 연구결과 첫째, 회복탄력성은 보육교사의 개인특성 중 직급과 연령에 따라 자기조절능력과 긍정성, 대인관계 모두에서 통계적으로 유의하게 높게 나타났다. 둘째, 보육교사의 개인적 특성에 따른 직무만족도는 보육경력, 최종학력, 직급, 연령에 따라 차이가 있는 것으로 나타났다. 보육경력이 높을수록, 연령이 높을수록, 직급은 원감이 직무만족도가 높게 나타났다. 셋째, 보육교사의 회복탄력성 중 긍정성 요인이 직무만족도를 설명하는 가장 중요한 요인인 것으로 나타났다. The purpose of this study was to investigate care day teachers" job satisfaction and resilience according to their personal variables. The subjects of this study were 204 teachers working in daycare center, Gyeongbuk. KRQT(Korean Resilience Quotient Test) developed by Kim(2011) and Job satisfaction Questionnaire by Shin(2004) were utilized in this study. Statistic analysis was performed using independent t-test, F-test and Stepwise Multiple Regression Analysis. The results are as follows. First, the differences of teachers" job satisfaction were appeared according to teaching careers education level, their position and their age. Teachers" job satisfaction is higher, when they are in high teaching career group, in the position of assistant principal and in the age of 30-34. Second, according to their position and age, resilience mean score(each of the subordinate factors) of child care teachers were higher than other groups. Third, the resilience, explained about the variance of the child care teachers" jobsatisfaction scores, especially "optimistic attitude" was very important variable in improving job satisfaction. Finally researchers suggested a few direction of resilience-related study and for developing pre- and in service teacher training programs.

유치원 만 5세 유아들의 또래와의 놀이 거부에 관한 사례 연구

최효정(Hyo Jung Choi),홍용희(Yong Hee Hong) 이화여자대학교 교육과학연구소 2020 교육과학연구 Vol.51 No.4

본 연구는 하늘유치원 만 5세 바다반 유아들이 또래와의 함께 놀이를 거부하는 이유와 거부를 당한 유아들의 대응 양상, 갈등 해결을 위한 교사의 지도 방법에 관한 탐구를 통해 놀이 거부 상황 전반을 이해하는 데 목적이 있다. 연구 대상은 하늘유치원 만 5세 바다반 유아 22명과 교사 1명이고, 자료 수집은 2017년 3월 13일부터 2017년 12월 31일까지 이루어졌으며, 참여 관찰, 교사면담, 문서 수집과 동영상 촬영, 오디오 녹음, 현장 약기 등의 방법을 사용했다. 수집된 자료는 전사본을 만들고 범주화해나가며 분석했다. 연구결과는 다음과 같다. 첫째, 만 5세 바다반 유아들이 또래와의 함께 놀이를 거부하는 이유는 특정 놀이 구성원과의 놀이 고수를 위해, 자신의 놀잇감 점유권 및 놀이의 주도권 주장을 위해, 흥미영역 사용 규칙 준수를 위해, 자신의 놀이 아이디어 소유권 보호를 위해서였다. 둘째, 만 5세 바다반의 놀이 거부를 당한 유아들의 대응 양상은 놀이 거부아에게 끼워주기를 계속 요구하기, 놀이 거부아에게 문제 제기하기, 놀이 거부아를 설득하기, 놀이 거부아를 비난하기, 함께 놀이를 포기하고 대안을 찾기, 교사에게 도움 청하기로 나타났다. 셋째, 교사의 지도 방법은 놀이 거부 이유 파악하여 중재하기, 놀이 거부로 인한 갈등 해결방안 제안하기, 유아들이 문제를 주도적으로 해결하도록 지원하기로 나타났다. 본 연구의 결과를 통해 놀이 거부 상황에 있는 각 입장 유아들에 대한 이해를 돕고, 교육현장에서 놀이 거부 상황을 유아들의 사회인지 발달을 지원할 수 있는 환경으로써 인식하고 접근하기를 기대한다. This study aimed to understand conflicts among children due to the rejection of play. To do so, this study focused on exploring the reasons why kindergarten children reject playing with peers by analyzing the teacher’s instruction and the responses of the children who rejected playing together. This study was conducted with 22 five-year-old children and one teacher in the Sea Class of Sky Kindergarten located in Seoul, Korea. The research data were collected from March 13, 2017 through December 31, 2017. The methods used to collect data included participatory observation, teacher interview, document collection, video recording, audio recording, and field jotting. The collected materials were analyzed by making transcripts and categorizing them. The results of this study are as follows: First, children rejected playing with their peers because they wanted to play only with certain children, possess certain toys or assert their will to play certain games, enforce self-made rules governing their defined spaces, and defend their claims to such spaces. Second, children who were rejected by their classmates continued to ask those who rejected them to play together, bringing up a problem with the child who rejected playing together, trying to persuade children who rejected them, criticizing the children who rejected them, looking for alternatives, giving up entirely on playing together, and asking the teacher for help. Third, the teacher’s instruction affecting the resolution of the conflicts included intervention by understanding the reasons why children rejected playing together, proposing a resolution to conflict caused by rejection, and encouraging the children to take the lead to execute the resolution. Results of this study could help us understand how children in each position in a situation of rejection could recognize and approach the situation in an environment that supports children’s social development.

유아의 행복감과 관련변인들 간의 관계구조분석

최효정 ( Choi Hyo-jung ) 미래유아교육학회 2022 미래유아교육학회지 Vol.29 No.4

The purpose of this study was to establish the structural relationship among preschool children’s happiness and related variables such as self-esteem, preschool childrenteacher intimacy and peer competence and to examine the effect of such a relational structure of these variables on preschool children’s happiness. The participants included 470 3 to 5 years old preschool children enrolled in kindergartens and child care centers, located in Seoul and Gyeonggi-do. The data were analyzed with tested the statistical significance of the data at p=.05, .01, .001 by using AMOS 26.0. The findings were as follows: First, each of self-esteem, infant-teacher intimacy and peer competence had a direct effect on preschool children’s happiness. Second, both preschool childrenteacher intimacy and the peer competence, as mediating variables, had indirect effects on the effect of preschool children’s self-esteem on their happiness. The results of this study suggest that the formation of positive relationships with teachers and peers in early childhood educational institutions can help preschool children feel happy continuously as an environment that supports preschool children’s self-esteem.

『나띠야샤스뜨라』의 하스딱무드라에 나타난 인도무용의 특성

최효정 ( Hyo Jung Choi ),강인숙 ( In Sook Kang ) 대한무용학회 2012 대한무용학회논문집 Vol.70 No.5

India has the longest history and tradition in the Orient. Academic systematization in culture, arts, and philosophy was done as lots of data had enormously been increased. Interrelationships among lots of scriptures were identified based on Veda, the longest scripture, and other teaching and explanations were discussed from their own perspectives. there is 『NatyaSastra』, the longest literature on dance and play Among such a great deal of literature, Hastamudra was minutely recorded in chapter 9 of 『NatyaSastra』. This was clearly shown in the Indian traditional dance of these days and played an important role in understanding characteristics of Indian traditional dance for its typicality and objectivity. Therefore, Hastamudra of『NatyaSastra』serves as the basic text. In particular, In particular, Hastamudra『NatyaSastra』was one of the most noticeable characteristics of Indian traditional dance. Indian traditional dance was based on Hastamudra of 『NatyaSastra』and had very implicative and symbolical expression system. Results that Hastamudra movements of Indian traditional dance were analyzed based on Hastamudra of『NatyaSastra』were as follows. Hastamudra of『NatyaSastra』appears ineach gesture in Indian traditional dances such as ``Bharata Natyam``, ``Kathakali``, ``Odissi``, ``Kathak``, and ``Kutiyattam``.

전라북도 농업용수 수질 변동평가

최효정(Hyo-Jung Choi),안병구(Byung-Koo Ahn),고도영(Do-Young Ko),박나영(Na-Young Park),전형권(Hyong-Gwon Chon),김진호(Jin-Ho Kim) 한국토양비료학회 2020 한국토양비료학회 학술발표회 초록집 Vol.2020 No.10

왕우렁이의 논잡초 생물학적 방제 효과 및 벼수량 변화

최효정(Hyo-Jung Choi),서상영(Sang-Young Seo),최선우(Seon-Wu Choi),배세홍(Se-Hong Bae),김주희(Ju-Hee Kim) 한국토양비료학회 2023 한국토양비료학회 학술발표회 초록집 Vol.2023 No.10

Chemical speciation of Cu and Zn in mine soil as affected by organic chelating agents with different C/N ratio

Hyo-Jung Choi(최효정),Hee-Myong Ro(노회명),Seok-In Yun(윤석인) 한국토양비료학회 2008 한국토양비료학회 학술발표회 초록집 Vol.2008 No.9

아동의 지시적 불투명성 이해와 관련변인에 대한 연구

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.