스테가노그래피 소프트웨어 분석 연구 - 성능 비교 중심으로

이효주,박용석,Lee, Hyo-joo,Park, Yongsuk 한국정보통신학회 2021 한국정보통신학회논문지 Vol.25 No.10

스테가노그래피는 데이터 안에 데이터를 은폐하는 기술로, 전달 매체의 존재가 발각되지 않도록 하는 것이 주요목적이다. 현재 스테가노그래피 관련 연구는 알고리즘을 기반으로 정립된 은닉 기법, 검출 기법들에 관련해서 다양하게 연구되고 있지만, 소프트웨어 성능을 분석하기 위한 실험 중심의 연구는 상대적으로 부족하다. 본 논문은 서로 다른 알고리즘으로 데이터를 은폐하는 다섯 개의 스테가노그래피 소프트웨어의 특징을 파악하고, 평가하는 데 목적을 두었다. 스테가노그래피 소프트웨어의 성능 조사를 위하여 시각 평가 척도로 사용되는 PSNR(Peak Signal to Noise Ratio), SSIM(Structural SIMilarity)을 이용하였다. 스테가노그래피 소프트웨어를 통하여 임베딩한 스테고 이 미지들의 PSNR, SSIM을 도출하여 정량적 성능 비교 분석한다. 평가 척도에 따라 우수한 스테가노그래피 소프트웨어를 소개하여 포렌식에 기여 하고자 한다. Steganography is a science of embedding secret data into innocent data and its goal is to conceal the existence of a carrier data. Many research on Steganography has been proposed by various hiding and detection techniques that are based on different algorithms. On the other hand, very few studies have been conducted to analyze the performance of each Steganography software. This paper describes five different Steganography software, each having its own algorithms, and analyzes the difference of each inherent feature. Image quality metrics of Peak Signal to Noise Ratio (PSNR) and Structural SIMilarity (SSIM) are used to define its performance of each Steganography software. We extracted PSNR and SSIM results of a quantitative amount of embedded output images for those five Steganography software. The results will show the optimal steganography software based on the evaluation metrics and ultimately contribute to forensics.

만 5세 유아의 로봇 놀이 경험의 의미연구: 자유놀이와 구조적 집단활동을 중심으로

이효주,남기원,Lee, Hyo Ju,Nam, Ki Won 국제문화기술진흥원 2022 The Journal of the Convergence on Culture Technolo Vol.8 No.6

The purpose of this study is to compare the meaning of the experience of robot play in the free play time of 5-year-old children in daycare centers with the experience of 5-year-old children in the structural group activities of teachers. To this end, a total of 32 children (15 in the experimental group and 17 in the comparative group) aged 5 were conducted for 1 hour three times a week for 10 weeks. Robots were supported as toys in the classroom of the experimental group, and children in the comparative group freely experienced robot exploration and play during free play time, and children in the comparative group learned the robot's functions and performed structural group activities based on the 2019 Revised Nuri Curriculum national-level curriculum. As a result of analyzing the difference between pre-test and post-test, the use of robots in free play showed a significant effect in creativity and fluency of children, and a significant effect in expression of pleasure in playability. These results suggest that robots are meaningful as play materials in early childhood education, which aims for infant-led free play, and that it is worth studying the robot experiences of children in these free situations in the future.

전기화학적 수소 장입에 따른 Ti 합금의 미세조직 및 기계적 특성 분석 연구

이효주(H. J. Lee),아나만 샘(Sam Yaw Anaman),최정묵(J. M. Choi),박이주(L. J. Park),이근호(K. H. Lee),김재국(J. K. Kim),이종숙(J. S. Lee),조훈휘(H. H. Cho) 한국소성가공학회 2022 한국소성가공학회 학술대회 논문집 Vol.2022 No.12

전복사고 운전자를 대상으로 자동차 안전장치에 대한 행동특성 분석

이효주(Lee, Hyo-Ju),김호중(Kim, Ho-Jung),이강현(Lee, Kang-Hyun),이명렬(Lee, Myung-Lyeol),최효정(Choi, Hyo-Jueng) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.11

본 연구는 전복에서 사고의 특성과 운전자의 행동특성을 분석하기 위한 연구이다. 연구기간은 2011년 1월에서 2014 년 5월까지이며 연구대상은 전복사고로 응급의료센터에 내원한 운전자 102명이었다. 연구도구는 교통안전공단 인체상해 데 이터를 이용하였으며 여기에는 자동차의 손상정도와 환자의 데이터를 수집하여 정리된 내용으로 차량의 기본정보와 환자정 보, 손상의 역학적 원인과 사진 상의 손상정보, 환자의 임상적 손상정보를 모두 포함하고 있다. 자료분석은 SPSS 18.0을 이용 하여 기술통계, ANOVA, Chi-square test 분석을 시행하였다. 분석 결과 차량종류에 따른 손상정도계수(Injury Severity Score) 평균 점수는 작은 차량에서 6.00점, 높은 차량에서 11.78점, 그 외 차량에서 14.70점을 보였고 세 집단 간 유의한 차이는 보이 지 않았다(P=.267). 안전벨트 착용 여부에서 남자가 여자에 비해 안전벨트를 유의하게 착용하지 않는 것을 볼 수 있었으며 (P=.007), 차량 종류나 날씨 등이 안전벨트 착용 여부와 상관관계를 보이지는 않았다(P=.755, P=.793). 하지만 차량의 크기가 작을수록 운전자들이 안전벨트를 차용하지 않는 경향을 보였고, 날씨가 맑은 날 오히려 안전벨트를 좀 더 착용하는 경향을 볼 수 있었다. 마지막으로 전복 사고에서도 다른 사고 유형에서와 마찬가지로 안전벨트 착용 여부가 손상에 큰 영향을 미치 는 것을 확인할 수 있었다. This is to analyze of driver behavioral and the accident characteristics in rollover. The study period was January 2011 to May 2014 and the subject of study was 102 person who were drivers visited the emergency room. Research tool includes a damage information of the vehicle, accident mechanism, damage to the patient clinical information with the injury data from the ROAD Traffic Authority. For data analysis, SPSS 18.0 was used for t-test, ANOVA and Chi-square test. Injury Severity Score average score according to the vehicle type is 6.00 points in the smaller vehicle, at high vehicle 11.78 points, from the other vehicle that showed 14.70 points. Significant differences between the three groups did not show (P=.267). Men did not use a seat belt significantly compared to women(P=.007). Vehicle type and weather, this was no correlation with whether or not use the seat belt(P=.755, P=.793). But showed a tendency to smaller size vehicles drivers do not use a seat belt, the weather could see a little more inclined to use a seat belt rather than a sunny day. Finally, in rollover accidents as in other types of accident it was confirmed that the seat belt has a great influence on the damage.

기혼 여성근로자의 삶의 질에 관한 비교 연구: 여가 및 직장생활 수준의 매개효과 분석을 중심으로

이효주(Lee, Hyo-Joo),오수연(Oh, Su-Yeon),박성민(Park, Sung-Min) 한국정부학회 2020 한국행정논집 Vol.32 No.3

개인의 행복이 과거 어느 때 보다 중요해진 대한민국에서 직장생활과 가사, 육아를 병행하는 ‘워킹맘’은 지속적으로 증가하고 있다. 정부는 일·가정 양립을 위한 친가족 정책 확대, 주 52시간제 도입 등 노동생산성, 삶의 질 제고를 위한 정책적 노력을 강구하고 있다. 이러한 현실을 반영하여, 본 연구는 대한민국 기혼여성 근로자들의 직장생활, 여가생활, 삶의 질을 결정하는 요인을 살펴보았다. 구조방정식 모형 분석을 통해 개인(학력, 가구 총소득, 고용 안정성, 미성년 자녀), 배우자(도구적·정서적 지지), 직장 요인(성차별, 친가족 정책)이 여가생활과 직장생활의 질에 미치는 영향과 이를 매개하여 삶의 질에 미치는 영향 관계를 규명하였다. 또한, 이러한 영향 관계와 여가생활의 질, 직장생활의 질, 삶의 질 인식 수준에 있어 공공·민간부문 근로자 간의 유의미한 차이를 검증하기 위해 조절효과 분석과 독립표본 t-test 검정을 실시하였다. 분석결과, 미성년 자녀의 수가 작을수록, 배우자의 정서적 지지와 성차별 인식이 높을수록 여가생활의 질이 높은 것으로 나타났다. 가구 총소득, 고용안정성, 배우자의 도구적·정서적 지지, 친가족 정책 제공수준이 높을수록, 성차별 인식이 낮을수록 직장생활의 질이 높으며, 직장생활의 질은 삶의 질에 긍정적 영향을 미치는 것으로 나타났다. 한편, 이러한 영향관계에 있어 공사부문 간의 유의미한 차이는 없는 것으로 나타났다. 본 연구는 시의적절한 연구주제를 이론적으로 조망할 뿐 아니라, 분석 결과를 바탕으로 공공·민간부문 인사관리 담당자들에게 정책적·실무적 함의를 제공할 것이다. Apparently, the Korean government is currently making enormous efforts to enhance the level of labor productivity and quality of life (QOL) by expanding family-friendly policies and introducing a 52-hour weekly system to balance work-family/life in a effective way. Reflecting these important societal and policy-driven issues, this study examined the factors that determine the quality of life, work life (QWL), and leisure life (QLL)of married female workers in Korea. First, through structural equation model analysis, the effects of individuals (educational level, gross household income, employment stability, minor children), spouses (instrumental and emotional support), and workplace factors (gender discrimination, family policy) on the QLL and QWL. In addition, the effects of these two mediating variables on QOL were investigated. Second, In order to verify the significant differences between public and private sector employees in terms of QLL, QWL, and QOL, a moderation effect analysis and an independent sample t-test were conducted. The empirical findings reveal that, the smaller the number of underaged children, and the higher the emotional support and gender discrimination awareness of the spouse, the higher QLL. The higher the level of household gross income, employment security, the instrumental and emotional support of the spouse, and the provision of family-friendly policies, the lower the perception of gender discrimination, the higher QWL. It also appears that the QWL has a positive effect on the QOL. We are assured that this study will not only provide in-depth theoretical lenses of timely research topics, but also provide a lot of policy and practical implications to HR experts and managers in the public and private sectors based on the aforementioned results.

입법부 공무원의 성과평가제도 수용성에 미치는 영향요인 연구

이효주(Lee, Hyo Joo),최은영(Choi, Eun Young),박성민(Park, Sung Min) 한국조직학회 2017 한국조직학회보 Vol.14 No.2

언어재활사의 몸짓언어중재 실태와 ‘표준 몸짓언어 체계’ 개발의 필요성 조사연구

이효주(Hyo Joo Lee),서창원(Chang Won Seo) 한국언어치료학회 2017 言語治療硏究 Vol.26 No.4

Purpose: The present study aimed to investigate body language intervention by speech language pathologists (SLP) and the necessity of developing a body language system. Methods: Three areas were measured via questionnaire: SLPs basic information and working information, the characteristics of intervention subjects, including the actual condition of language intervention using gestures (body language), and the necessity of developing a standardized body language system.Questionnaires were emailed to SLPs and 113 responses were collected. The frequency and percentage of the collected questionnaires were analyzed. Results: First, autistic spectrum disorder and intellectual disability were the most common disabilities of the subjects who had language intervention. The main problem with subjects was the problem of expressive and receptive language. In addition, 84.1% of SLPs had mediated subjects with limited use of spoken language. Second, gestures were the most frequently used complementary means of communication used for subjects with limited use of spoken language; when using gesture mediation, most SLPs used gesture intervention systems designed by themselves Third, the rate of SLPs who answered yes to the need for development of a standard gesture language system was 95.6%. Conclusions: The results of this study confirmed the actual condition of body language intervention in the clinical field. In the actual language rehabilitation field, the number of subjects with limited spoken ability requiring AAC was high and intervention using gestures was mainly conducted for these subjects. In addition, we suggested the development of a standard body language system which could be useful for SLPs, and the requirements for the development of such a system.

체결용 Ti 합금의 미세조직 특성 및 기계적/전기화학적 거동 분석 연구

이효주(H. J. Lee),Sam Yaw Anaman,최정묵(J. M. Choi),이근호(K. H. Lee),박이주(L. J. Park),조훈휘(H. H. Cho) 한국소성·가공학회 2022 소성가공 : 한국소성가공학회지 Vol.31 No.3

전기화학적 방법에 의해 수소 장입된 Ti 합금의 미세조직 및 기계적 거동 분석

이효주(H. J. Lee),Sam Yaw Anaman,최정묵(J. M. Choi),박이주(L. J. Park),이근호(K. H. Lee),박준식(J. S. Park),조훈휘(H. H. Cho) 한국소성·가공학회 2023 한국소성가공학회 학술대회 논문집 Vol.2023 No.5

장애인치과학 수업 전후의 치의학 전문대학원 학생들의 장애인에 대한 인식 변화 연구

이효주(Hyo Joo Lee),방재범(Jae-Beum Bang),이은영(Eun Young Lee),김광철(Kwang Chul Kim) Asia association of Disability and Oral health 2014 International Journal of Disability and Oral Healt Vol.10 No.1

Patients with disabilities are a significant segment of Korea population. However, they encounter more challenges when seeking dental care. So, dentists and students who are future dental providers should have a responsibility to provide oral care services for them. In this study, we hypothesize that the education of special care dentistry may influence positive attitudes of the disabled. The attitudes are influenced by demographic variables such as gender, religion, experience of volunteer activities and marital status. Therefore, the objective of this study was to explore the change of attitudes of students towards people with disabilities between before and after class of special care dentistry. 72 students enrolled at the Kyung Hee University were surveyed. All participants attended class of Special Care dentistry in the third grade. The survey was conducted two times, just before class and after class. The attitudes of students were assessed using the well-documented ATDP (Attitude Toward Disabled Person)-O(Original) scale and MAS (Multidimensional Attitudes Scales Toward Persons with Disabilities) scale through the methodology of questionnaires. The results indicated that gender, experience of volunteer activities and marital status did not affect their ATDP and MAS score. In religious affiliation, only, there were statistically significant difference in student attitudes between before and after class of Special care dentistry. It means that habitual religious activity may offer stronger effects on student’s attitude than short-term education. Therefore, long-term and specific educational experiences are needed to promote positive attitudes for people with disability.