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정대용,이종태,Jeong, Dae-Yong,Lee, Jong-Tai 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
Combustion characteristics on diesel-water emulsion are analyzed in high pressure injection for several variables such as water content, injection pressure and injection timing. As a fact of well-known, maximum combustion pressure was decreased and ignition delay was elongated in accordance with increasing of water content. But these characteristics were enhanced with increase of injection pressure to high pressure. It was shown that combustion of neat diesel in case of injecting with 600bar is similar to that of 20 % diesel-water emulsion was injected at 1200 bar.
디젤분무의 한계압력 규명을 위한 극초고압 충돌분무특성 해석
정대용(Daeyong Jeong),이종태(Jongtai Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Impinging spray characteristics were investigated to find limit injection pressure by using ultra high pressure injection equipment. Spray radius and spray height were increased continuously with increase of injection pressure, but the rates of enhancement had a moderate increase ove<br/> 2,500bar injection pressure. Impinging spray characteristics were reversed as same tendency as free spray characteristics at 4, I 40bar. Spray radiuses and heightes of left and right side fro nozzle had little difference until 2000bar injection pressure, but remarkable difference caused by the effect of shock wave in ultra high pressure region. Above results show that the limit injection pressure of impinging spray exists around 4,OOObar.<br/>
정대용(Daeyong Jeong),이종태(Jongtai Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Ultra high pressure injection equipment was modified to estimate and analyze the spray characteristics in ultra high injection pressure. Spray patterns were visualized and investigated by method of schlieren in UHPIE. Spray penetration and spray thickness, angle and volume were increased with the increase of injection pressure. But over 2,800bar of injection pressure region the rate of increase shows almost same and finally spray penetration and volume were decreased.
고밀도 에너지 저장용 완화형 강유전체폴리머-세라믹 컴포지트
정대용 ( Dae Yong Jeong ),윤석진 ( Seok Jin Yoon ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 ELECTRONIC MATERIALS LETTERS Vol.2 No.3
Pulsed power systems such as electromagnetic and electrothermal guns, directed energy weapons, electromagnetic armor require high energy density capacitors. Energy density of capacitor is determined by the dielectric constant and dielectric breakdown strength. Both to increase the dielectric constant of polymer matrix and to increase the breakdown strength of ceramics, we investigated the relaxor ferroelectric polymer-ceramic composites for energy storage capacitors. Composites have larger dielectric constant than pure polymer. However, breakdown strength becomes lower than pure polymer. With the antiferroelectric ceramic-polymer composites, we can obtain the energy density 3.52 J/cc at a 100 V/um electric field.
여성 결혼이민자의 문해교육 경험이 자녀 교육에 미치는 영향
정대용(Jeong, Dae-Yong) 순천향대학교 특수아동교육연구소 2015 특수·영재교육저널 Vol.2 No.1
본 연구의 목적은 여성 결혼이민자들을 중심으로 그들이 한국에 정착하여 발생하는 다양한 문제들 중 자녀교육 문제와 관련하여 문해교육이 여성 결혼이민자들의 자녀교육에 미치는 영향과 의미는 무엇인지 심층적으로 살펴보고자 함에 있다. 연구 참여자는 동대문구 P교육센터의 문해교육에 참여하고 있는 여성 결혼이민자 6명으로 하였으며, 연구 방법으로는 질적 연구방법인 개방형(open-ended question) 질문을 통한 심층 면담과 참여 관찰 방법을 통해 연구하였다. 본 연구에서는 여성 결혼 이민자들의 참여 관찰 및 심층 면담을 통해 수집된 자료들을 범주의 틀에 맞추어 직접 해석하거나 비교 분석 하였다. 연구 결과 여성 결혼이민자들의 문해교육이 그들의 자녀교육에 주는 의미는 다음과 같다. 여성 결혼이민자 대상의 문해교육은 한글 교육을 받는 것에만 의미가 있는 것이 아니었다. 이들은 한글 교육을 받음으로써 사회에 참여할 수 있다는 ‘자신감’을 얻었다. 그리고 자녀 교육에 대한 관심을 가지게 되었을 뿐만 아니라 자녀들의 공부를 지도할 수 있게 된 연구 참여자도 있었다. 또한 자녀들과 대화 시간이 길어져 자녀를 이해하는 데 도움이 되고 있다고 하였다. 문해교육은 자녀의 언어 발달뿐 아니라 심리적인 안정과 긍정적인 관계형성에도 큰 도움을 주는 중요한 역할을 하였다. The purpose of this study is to examine the effect and meaning of literacy education on the education of married female immigrants' children in relation to the issue of children's education, which is one of the various problems these women are faced with while adjusting to their lives in Korea. The study participants were six married female immigrants who were also literacy education participants at P. Education Center in Dongdaemun-gu district, Seoul. Furthermore, the study method involved in-depth interviewsand participant observation through open-ended questions which are a form of qualitative research. The materials were collected through observing and in-depth interviewing married female immigrants; those materials were directly interpreted or comparatively analyzed within the categories. According to the study results, the effect of literacy education on married female immigrants is as follows: The effect of literacy education on married female immigrants did not merely involve the development of their Korean language skill. These women also obtained the 'confidence'to believe that they can participate socially as they received literacy education. One of the participants became not only interested in her own child's education, but even capable of teaching the child on her own. Moreover, literacy education helped the women to understand their children better through longer conversations with them. Literacy education played a vital role not only in developing their children's language skill, but also in enhancing their psychological stability and building positive relationships with others.
정대용(Dae Yong Jeong),김기범(Gibum Kim),이상진(Sangjin Lee) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.1
전자금융사기의 수법이 계속 진화하고 있다. 이에 대응하기 위해 다양한 연구와 대응방안이 제시되었으나 근절하기 어려운 상황이다. 본 연구는 MS社의 Threat Risk Modeling 기법을 통해 전자금융사기의 위험을 분석하고 그 대응방안을 제시하기 위한 목적으로 수행되었다. 분석 결과 인증수단의 차이에도 불구하고 파밍의 위험이 높으며 추가적인 인증수단이나 기기보안 혹은 사용자 인증 기반의 보안체계 만으로는 공격을 예방하기 어렵다는 것을 확인하였다. 이에 따라 보안수단별 거래 한도의 재조정, 계좌인증 등 예방수단 및 추가적인 물리적 보안수단의 도입, 전자금융사기 예방제도의 연계와 홍보 및 사용자 인식 개선을 통한 종합적인 전자금융사기 예방 정책의 수립 · 시행을 제안한다. The methods of electronic financial fraud continue to evolve. Various research and countermeasures have been proposed to counter this problem, but it is difficult to eradicate it. The purpose of this study is to analyze the risk of electronic financial fraud through MS Threat Risk Modeling and to propose the countermeasures against the electronic financial fraud. As a result of the analysis, it is confirmed that despite the difference of authentication methods, there is a high risk of pharming, and it is difficult to prevent attack by using only additional authentication means, device security or user authentication based security system. Therefore, this study suggests the introduction of preventive measures such as readjustment of transaction limit by security means, account authentication, and additional physical security measures. It also suggests the establishment and implementation of a comprehensive electronic financial fraud prevention policy through linkage of electronic fraud prevention system and improvement of public relations and user awareness.