재활용 절삭칩으로 제조된 AC2B 합금의 용체화 열처리에 따른 미세조직 및 기계적특성 변화

김동혁,윤종천,최창영,최시근,홍명표,신상윤,예병준,Kim, Dong-Hyuk,Yoon, Jong-Cheon,Choi, Chang-Young,Choi, Si-Geun,Hong, Myoung-Pyo,Shin, Sang-Yoon,Ye, Byung-Joon 한국주조공학회 2018 한국주조공학회지 Vol.38 No.2

Changes in the microstructures and mechanical properties of an AC2B alloy through solution heat treatment were investigated using recycled AC2B cutting chips as raw material. The as-cast microstructure of the AC2B alloy comprised ${\alpha}$-Al, $Al_2Cu$, and coarse needle-shaped phases considered to be eutectic Si and an Al-Fe-Si based intermetallic compound. After solution heat treatments at $505^{\circ}C$ for 1 h and 6 h, the samples showed complete dissolution of $Al_2Cu$ and relatively fine distribution of intermetallic compounds. Hardness test results showed that the hardness rapidly increased after the solution heat treatment for 1 h by solid solution hardening, and the increase of hardness exhibited a plateau from 1 h to 6 h. The results of the hardness and tensile tests showed that there was no visible difference in the effect of 1 h and 6 h solid solution treatment.

Nonlinear Aspects of the Frequency Response of a Gas-filled Bubble Oscillator

김동혁,김정태,이용봉,Kim, Dong-Hyuk,Kim, Jeung-Tae,Lee, Yong-Bong The Acoustical Society of Korea 1991 韓國音響學會誌 Vol.10 No.1

기포 진동 시스템에 대한 수치해석이 수행되었다. 수학적 모델은 기포역학에 대해서는 Keller의 식을, 기포내부 해석을 위해서는 Prosperetti의 식을 채택하였다. Prosperetti는 기포내부 해석을 위해 에너지 방정식을 도입하였으며 매우 정확한 해석을 가능케 하였다. 수치해석결과 기포진동의 주파수 응답곡선에 있어 전형적인 비선형 현상들을 볼 수 있었다. 이러한 비선형 현상들에는 점프현상(jump phenomena), 공진주파수의 변화, 그리고 superharmonic 공진점의 발생등이 있다. 비선형 주파수 응답은 기포진동 시스템의 초기조건에 따라 달라지는데 이에 의해 어느 가진 주파수 대역에서는 두개 이상의 해가 존재할 수 있게 된다. 기포진동 시스템에서 비선형 진동현상은 Duffing 방정식과 비교가 되는데 두 시스템은 비슷한 비선형 현상들을 가지고 있다고 볼 수 있다. A numerical analysis is carried out for the nonlinear phenomena of the bubble oscillator. The model is based on the Keller's formulation for the bubble dynamics. Interpretation of the bubble interior is based on the formulation by Prosperetti. His formulation adopts the energy equation for the analysis of the bubble interior. The numerical simulation Shows typical nonlinear phenomena in its frequency response. Among such nonlinear aspects are the jump phenomenon, the shift of natural frequency of the system, and the appearance of superharmonic resonances. It is deduced that the nonlinear frequency response is dependent upon the initial condition of the bubble oscillator and some multi-valued frequency region can appear in the response curve. Nonlinear phenomena appeared in the bubble oscillator is compared with those of the Duffing equation and it may be said that the bubble dynamic equation has similar nonlinear aspects to the Duffing equation.

웹을 기반으로 한 자기 주도적 MITS -초등 수학 수와 연산 영역 중심-

김동혁,고병오,최의인,Kim, Dong-Hyuk,Goh, Byung-Oh,Choi, Eui-In 한국정보교육학회 2004 정보교육학회논문지 Vol.8 No.3

Recently, there is change the environment of education due to development of Science Technology Specially, As education information on web increased by internet, using education web data by mean of medium that aids learning by computer. Also It studied method that used the Computer as learning medium through the CAI(Computer Assisted Instruction), ICAI(Intelligent CAI), and ITS(Intelligent Tutoring System). But legacy system are not support efficient method that learns to vary learner suitable learning method by individual level. Specially It is not suitable the education course to direct current course of education, and not consider different of student capability, aptitude, need, interesting, not maximized the individual growable power and effect of education. To solve the this problem, our paper suggest the web-based self-directed MITS(Multimedia ITS) that supply the needed the information on web, make the environment that can self-directed learning. To maximized effect of individual learning, our paper structured coursed, characterized, related learning contents in region of numeral at mathematics of primary school. And then integrated contents and class, design and implement the web-based MITS that consist of 4 module to escape from limitation of learner grade, learning time, learning place.

김유정 소설의 노장적 사유 연구 -"금"을 중심으로

김동혁 ( Dong Hyuk Kim ) 단국대학교 한국문화기술연구소 2011 한국문화기술 Vol.11 No.-

Kim Yoojung is a writer of the poverty. And the poverty is the only one theme which encompasses his own reality and the world of his works. His ephemeral life was poor. Only two years of his work career was also focused on imagining lives of the poor. However, there was always hope on his works. He didn`t humiliate poor and incompetent urban intellectuals who were cooped up in a dark cellar and make fun of them. And also he didn`t put dirtiness on gruesome reality of the rural communities that had degenerated into groups adrift living on prostitution. He ended twenty-nine years of short life and left about thirty short stories. People living with disability due to conflicting times appear in all his books. Kim Yoojung described the lives of these people as if they were the episodes in Jangja. Then, we could read his stories in a way of deep rational faculty of the mind shown in Noja. He talked about the reality of marginalized peasants in a wave of modernization as Obsession, deep rational faculty of the mind. The obsession of Kim Yoojung s novels emerge as Gold in reality. The author narrates us the farmers who had been growing beans with their head down and looks doomed by opening their eyes on gold, the symbol of temptation. In the process of its destruction the value and distribution between right and wrong was dissolved just as it was. We got to know the breakup of the thing which is right or wrong was the way of harmonizing with the nature and got to think about rational faculty of the mind with the eyes and the stomach in the way of adaptation told by Noja.

방기 전탕액의 비만세포 매개성 아나필락시반응 및 종양괴사인자알파 생성 억제효과

김동혁(Dong-Hyuk Kim),송봉근(Bong-Keun Song),이언정(Eon-Jeong Lee),김형균(Hyeong-Kyun Kim) 대한한의학회 2000 대한한의학회지 Vol.21 No.2

1965년 소련 경제개혁: 이론적 배경과 추진과정(1962-1966)

김동혁(Kim, Dong-hyuk) 한국외국어대학교 역사문화연구소 2015 역사문화연구 Vol.54 No.-

경제 관리 체계의 전반적인 개선에 대한 논쟁이 심화된 것은 1962년 리베르만의 〈계획, 이윤, 상여금〉이라는 《프라브다》 기고문이 발표되면서부터였다. 이를 기점으로 학계뿐만 아니라 전국의 계획 기관들과 하부 단위 기업들에서 리베르만 논쟁과 관련한 수많은 의견들이 중앙에 건의되었다. 게다가 1962-63년이 되면 1957년 개혁의 문제점에서부터 당시 소련의 전반적인 경제 실적 저하 경향에 대한 학계와 관리 기구 내에서의 문제제기가 본격화되었다. 특히 이 작업은 학술원, 과학적경제조사연구소 및 중앙통계국 등 경제 연구 기관들이 주도했고, 경제 관리 기관 내부의 계획 실무자들도 대거 참여했다. 이 과정에서 상층 관리자들의 상황 인식에 경제연구자들, 특히 수리경제학적 조류와 연관을 가지고 있던 학자들이 매우 직접적으로 영향을 주게 되었고, 이는 1963년 조직 재편에서부터 1965년까지의 일련의 경제관리 개선 노력으로 이어졌다. 경제학자들과 관리자들은 경제 관리 체계의 대대적인 재조직이 일어나지 않으면 안 된다는 결론에 이르게 되었고, 1964년부터 새로 제시된 경제관리 기법, 특히 물적 유인 체계 개선을 통한 수익성 극대화 방식을 도입하는 실험을 진행하게 되었다. 그리고 그 실험이 시작된 지 1년 후 소련 각료회의 의장 코시긴이 소련의 경제관리 전반에 대한 개혁을 선포했다. 이 개혁은 1950년대 후반부터 진행된 경제 논쟁에서 나온 많은 제안들을 절충적인 방식으로 수용했다. 가장 중요한 것은 기업과 노동자들의 생산 효율성을 높이고 수익성을 극대화하기 위해서 물적 유인 체계를 개선하고 기업의 자율권을 강화하는 내용이었다. 이를 위해 강제 할당되는 목표 지표들의 수가 대폭 줄어들었고, 이윤이 기업의 유인을 제공하는 가장 중요한 지표로 설정되었다. 또한 경제 관리 체계 전반에서 가장 중요한 가격체계가 대대적으로 조정되었다. The 1965 economic reform was launched after the long debates and was based on these theoretical transformations. The economic debates regarding the 1965 reform were performed by the major economic laboratories including newly organized mathematical economic labs. After the publication of Liberman’s article, ‘Plan, Profit, Bonus’ in Pravda, these debates were intensified. In the course of the debates, many economists and economic institutions affected the upper cadres of the soviet economic management system. Especially, the economists influenced by the new mathematical economics directly affected the soviet planners and cadres. As a result, many influential economists and upper cadres recognized the necessity of the overall economic reform in the Soviet Union. The economic experiments were begun from the 1964 following the newly proposed economic management, such as the improvement of profitability by means of the adoption of new incentive system. One year later, A. Kosygin, the prime minister of the Council of Ministers declared the 1965 economic reform. And the new wholesale prices were applied in 1966.

1962년 노보체르카스크(Новочеркасск) 노동자 봉기의 발생과 심화 원인에 대한 재고

김동혁(Kim, Dong-Hyuk) 효원사학회 2021 역사와 세계 Vol.- No.59

모세의 에티오피아 원정: 아르타파노스와 요세푸스 비교 연구

김동혁(Dong-Hyuk Kim) 한국구약학회 2021 구약논단 Vol.27 No.1

This article compares and contrasts two Hellenistic versions of the story of Moses’s Ethiopian campaign, the version of Artapanus (Praep. ev. 9.27.7-16) and that of Josephus (A.J. 2.238-257), so that it may investigate how the same motif was expressed differently in Hellenistic Egypt and in Eretz Israel and what roles each version played in its own setting. The study makes comparisons of each of the stages of the two stories. Then, it synthesizes the results and discusses the origin, purpose, and audience of Artapanus’s and Josephus’s versions of the story of Moses’s campaign against Ethiopia. Artapanus’s story is a “competitive historiography” originating from Hel lenistic Egypt. Since he wants his writing to be apologetic and polemic, Artapanus uses biblical and other sources freely. He portrays Moses as a national hero of Egypt and a founder of its culture so that he may correct contemporary anti-Jewish sentiments among non-Jews and enhance the self-esteem of Jews. Josephus’s story is not as polemic as Artapanus’s. He is not as free as Artapanus in adapting biblical sources, probably because his main purpose was to write a history as accurately as possible. Although Josephus must have wanted his writing to reach non-Jews, his attention seems to have been directed more toward Jews than non-Jews. This study helps take an in-depth look at the time, society, and people of each of the matrices where the same motif about a Jewish hero was made, developed, and circulated.

형사절차와 인권보장 ; 피해자 고소권의 법적 쟁점 -피해자의 고소적격을 중심으로-

김동혁 ( Dong Hyuk Kim ) 한국경찰법학회 2014 경찰법연구 Vol.12 No.2

Accused of a crime have the right to harm the victim party should of course say that the rights will be retained. In addition, victims of crime are generally social, legal, because it will often victims, which stands for the country`s citizens have a basic right to stand complaint should be addressed. Therefore, the concept of crime victims as a subject of complaint is not to be interpreted as limiting sense. 41) Thus, the ability of the civil action complaint by the ability of families without requiring that the de facto ability should see a doctor. Ability to conduct judicial recognition of the award, so it is widely recognized sense. We are also cases of adultery and obstruction of official business and legal interests, such as social and national legal interests complaint is recognized even if the infringement, and that victims are recognized based on the concept of complaint range “means a crime or act of the other party, including should be interpreted. Thus, the social and legal interests of national personal legal interests for the sinner. On the other hand, the concept of the victim must be a victim of the legal implications. For example, the lion victim of libel relatives or descendants of victims should be legal sense. complaint a legal concept, and therefore requires that the legal status because it should . The interpretation of the concept of the victims of these victims complaint zoom events and at the same time to ensure the legality of the exercise will help you efficiently.

중학생의 자기결정성과 체육수업만족 및 인성발달의 관계

김동혁(Kim, Dong-Hyuk),조선령(Cho, Sun-Lyoung) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.5

The purpose of this study is to identify empirically the relationship among self-determination, satisfaction of physical education class and character development, To this end, samples of middle school male and female students who live in ten different districts in Seoul, Gyeong-gi Province and In-cheon Metropolitan City were collected. The sample size of each district was 100 respectively. The final sample size used in convenience sampling, excluded insincere materials, was 962. Validity of the questionnaires was inspected by the experts’ conference, preliminary inspection and factor analysis. The reliability of the questionnaire shows =.695~ =.882. Statistical methods used in analysis are frequency analysis in order to identify internal consistency among questions, reliability verification, exploratory factor analysis and corelation analysis using SPSS 21.0 program. Moreover, confirmatory factor analysis and structural equation model using AMOS 20 program were used in order to identify research hypothesis. Through these research methods and procedures, the following conclusions were drawn. First, middle school student’s self-determination was a primary mechanism that had a positive effect on satisfaction of physical education class. Second, middle school student’s self-determination was a main mechanism that had a positive influence on character development. Third, middle school student’s satisfaction of physical education class was a key mechanism that had a positive influence on character development.