원자력발전소 안전해석연구 품질보증 적용방안

하지훈,이영건,오연우,박찬국 한국산업경영시스템학회 2008 한국산업경영시스템학회 학술대회 Vol.2008 No.추계

In the nuclear industry, the quality assurance system has played an important role to obtain reliability and safety culture, since nuclear power quality assurance standards were issued and applied. This paper is designed to suggest an applicable QA system for safety analysis project related to nuclear plant by graded application of nuclear quality assurance code. This QA system can be used as a guideline on implementation of the QA system for similar nuclear projects .

Storytelling을 통한 영어지도에 관한 연구

하지훈 The English Linguistic Science Association of Kore 2000 English Linguistic Science Vol.4 No.-

아날로그 응용을 위한 DWFG MOSFET의 매크로 모델 및 연산증폭기 설계

하지훈,백기주,이대환,나기열,김영석,Ha, Ji-Hoon,Baek, Ki-Ju,Lee, Dae-Hwan,Na, Kee-Yeol,Kim, Yeong-Seuk 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.8

In this paper, a simple macro model of n-channel MOSFET with dual workfunction gate (DWFG) structure is proposed. The DWFG MOSFET has higher transconductance and lower drain conductance than conventional MOSFET. Thus analog circuit design using the DWFG MOSFET can improve circuit characteristics. Currently, device models of the DWFG MOSFET are insufficient, so simple series connected two MOSFET model is proposed. In addition, a two stage operational amplifier using the proposed DWFG MOSFET macro model is designed to verify the model.

원자력 연구개발과제 품질보증 수립과 적용사례 연구

하지훈,이영건,박찬국 한국산업경영시스템학회 2009 한국산업경영시스템학회 학술대회 Vol.2009 No.춘계

A institute developed Quality Assurance(QA) program for nuclear R&D projects to meet the demands of its customers' requirements for recognized quality standards and nuclear industry accepted practices. It was implemented by project quality assurance plan as a new process. This paper is designed to introduce the process of establishment and execution of nuclear quality assurance programs for R&D as a case study. This QA program can be used as a reference to other organization on implementation of QA for R&D projects.

Synthesis, Antioxidative and Whitening Effects of Novel Cysteine Derivatives

하지훈,김경미,정윤주,박영민,이재영,박진오,박수남 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.1

Recently, development of biocompatibility functional cosmetic agents as antioxidant or whitening agent has increased. In this study, synthetic cysteine derivatives (DBLS-21, -24, and -33) were developed containing syringic acid and cysteine moieties (l-cysteine ethyl ester, N-acetyl cysteine methyl ester, and N-acetyl cysteine ethyl ester), and their antioxidative and whitening activities were evaluated. The cellular protective effect (τ50) of DBLS-21 was 51.1 min at 50 μM on1O2 -induced hemolysis of erythrocytes. This activity was slightly higher than that of α-tocopherol (43.6 min) as a lipophilic antioxidant. In the melanogenesis inhibitory effect, DBLS-21, -24, and -33 was 1.6-, 1.8-, and 2.5-fold higher than arbutin, respectively. In particular, DBLS-21 and -33 was 112.8- and 6.1-fold higher than arbutin, respectively (293.4 μM) on tyrosinase inhibition activity (IC50 ). But DBLS-24 had no tyrosinase inhibitory activity. These results suggest that cysteine derivatives possess potential for use as an antioxidant agent (DBLS-21) and whitening agents (all derivatives) in cosmetics.

2015 개정 교육과정 과학과 교과역량에 대한 초등교사의 인식과 적용 실태 분석

하지훈,신영준,곽영순 한국초등과학교육학회 2020 초등과학교육 Vol.39 No.2

The purpose of this study was to analyze field application of science subject competences of the 2015 revised curriculum for the second year of application. For this purpose, a survey with 133 elementary school teachers, and in-depth interviews with 10 teachers were conducted. According to the results, elementary school teachers had a positive awareness toward the science subject competence, which is a characteristic of the 2015 revised science curriculum, and teachers were applying the science subject competence to their own classes. This tendency was stronger in teachers in science-leading schools than in teachers in regular schools. Teachers wanted support for applying science subject competencies to their classes. To support this, it is necessary to provide the curriculum materials focused on science subject competencies, reinforce teacher training on competence-related curriculum, and activate the professional teacher community.

이미지처리를 통한 선박평형수 내 유해수중생물 개체수 측정

하지훈,임효혁,김용혁 사단법인 인문사회과학기술융합학회 2016 예술인문사회융합멀티미디어논문지 Vol.6 No.3

선박평형수란, 선박의 균형을 유지하기 위해서 배에 채우는 바닷물을 말한다. 선박평형수를 통한 외래종 유입은 생태계 교란의 주된 원인이다. 이를 방지하기 위해 IMO(International Maritime Organization)에서는 2004년 선박평형수와 침전물 관리협약을 채택하였다. 협약이 발효될 경우 각국 항만 당국에서는 선박평형수가 협약의 성능 기준에 맞게 배출되는지 확인이 필요하다. 본 논문에서는 이미지처리를 통한 선박평형수 내 유해수중생물 개체수 측정 방법을 제안한다. 부산 신항에서 채취한 선박평형수로부터 3개의 샘플을 추출하였으며, 각 샘플당 서로 다른3개의 grey-scale 이미지를 만들어 실험자료로 사용하였다. 이미지처리를 이용한 자동 세포계수 프로그램인 CellProfiler를 이용하여 본 논문에서 제안하는 방법과 비교하였다. CellProfiler에서 사용한 설정은 사람이 직접 세포계수를 한 결과에 맞춰 경험적으로 결정하였다. 각 이미지에서 CellProfiler와 가장 유사한 결과를 보이는 최적의 임계값을 찾은 뒤 그 평균을 최종 임계값으로 사용하였다. 실험결과에서 제안한 방법은 CellProfiler와 비슷한 세포 계수 결과를 보이면서도 약 10배 정도 빠른 처리 속도를 보였다. Ballast water provides stability and manoeuvrability to a ship. Foreign harmful aquatic organisms, which were transferred by ballast water, cause disturbing ecosystem. In order to minimize transference of foreign harmful aquatic organisms, IMO(International Maritime Organization) adopted the International Convention for the Control and Management of Ship’s Ballast Water and Sediments in 2004. If the convention take effect, a port authority might need to check that ballast water is properly disposed of. In this paper, we propose a method of counting harmful aquatic organisms in ballast water thorough image processing. We extracted three samples from the ballast water that had been collected at Busan port in Korea. Then we made three grey-scale images from each sample as experimental data. We made a comparison between the proposed method and CellProfiler which is a well known cell-counting program based on image processing. Setting of CellProfiler is empirically chosen from the result of cell count by an expert. After finding a proper threshold for each image at which the result is similar to that of CellProfiler, we used the average value as the final threshold. Our experimental results showed that the proposed method is simple but about ten times faster than CellProfiler without loss of the output quality.

청소년 환경단체 활동 참여 경험이 기후 시민성 형성에 미치는 영향 : 생애사 연구를 바탕으로

하지훈,윤순진 한국구술사학회 2022 구술사연구 Vol.13 No.1

이 연구에서는 청소년 환경단체 활동에 참여한 청소년들이 성인이 된 이후에도 기 후변화에 대한 문제의식을 유지하고, 사회 제도와 정책 변화를 이끌어내기 위해 행동 하는 ‘기후 시민’으로 성장하기 위해서 청소년 환경단체가 어떠한 역할을 해야 하는지 제시하고자 하였다. 이를 위하여 기후변화 문제를 해결하기 위하여 능동적이고, 적극 적으로 행동하는 사람들을 이해하는 데 가장 근접한 개념인 ‘기후 시민성’을 분석틀로 활용하였으며, 청소년 환경단체 활동에 참여한 경험이 있는 성인 4명을 연구대상으로 선정하였다. 또한 내러티브를 활용한 생애사 연구 방법을 채택하여 청소년 환경단체 활동 참여 경험이 삶 전반에 걸쳐 기후 시민성 형성에 어떠한 영향을 미쳤는지를 분 석하였다. 연구 결과 능동적이고, 체험적인 활동이 이루어지면서 또래들과 관계를 형 성하고, 의사결정 과정에 참여하는 등 당시의 활동 참여는 ‘의미 있는 경험’이라 할 수 있었다. 하지만 성인이 된 현재는 기후 시민성 특징을 고루 갖춘 연구 참여자는 발견하지 못하였다. 청소년 환경단체는 청소년들의 관심과 흥미를 끄는 데까지는 성공했지만, 이들이 성인이 된 이후에 기후 시민으로 성장하도록 견인하는 역할은 해내 지 못하였다. 따라서 이 연구에서는 연구 결과를 종합하여 청소년 환경단체 활동 참여 경험의 영향이 청소년 시기에 머무르지 않고, 성인이 된 이후에도 영향을 미칠 수 있도록 하기 위한 개선방안으로 청소년 회원들을 대상으로 한 보다 체계적이고 전문적 인 환경교육과 전 국민 대상 평생 환경교육, 환경단체 운영방식 개선을 통한 사회적 신뢰 확보, 다양하고 균형잡힌 정보 제공과 토론 중심의 교육 방식, 전국 단위의 청소년 환경기후 모임 활성화 등을 제안하였다. This study attempts to suggest what role youth environmental organizations should play to grow into 'climate citizens' who consistently maintain awareness of climate change and act to bring about changes of social systems and policies even after they become adults. To this end, 'climate citizenship,' the closest concept to understanding people who actively solve the climate change problem, was adopted as an analysis framework. For the study, four adult subjects with experience in youth environmental organization activities were chosen. Then, by adopting a life history research method using narratives, it was analyzed how the experience of participating in youth environmental organization activities affected the formation of climate citizenship throughout their life. As a result of the study, participants could acquire 'meaningful experiences' such as forming relationships with peers and participating in decision-making through various hands-on activities. However, as an adult, no research participants had climate citizenship characteristics. Youth environmental organizations were successful in attracting youth attention and interest but did not play a significant role in laying the foundation for youth members to grow into climate citizens after they become adults. Therefore, this study synthesized the research results and suggested five improvements to ensure that the influence of youth environmental organization participation experience stays in the youth period and continues throughout adulthood. It proposes the improvement plans of more systematic and professional environmental education for the youth members, nationwide lifelong environmental education, operational improvement of environmental organizations to secure social trust, provision of various and balanced information and discussion-oriented education methods, and activation of national youth gathering.

우리나라 주요 발전 방식에 대한 초등학생 인식 분석

하지훈 에너지기후변화교육학회 2019 에너지기후변화교육 Vol.9 No.1

The purpose of this study is to analyze perceptions of elementary school students about Korean main generation systems. For this purpose, We set five standards about SDG7. Three subjects were selected for comparison: Thermal power generation, nuclear power generation, and renewable energy generation. The survey method was used to investigate students' perceptions by pair comparison methods. The results of this study are summarized as follows: It is confirmed that the renewable energy generation is recognized as the generation that best meets SDG7 in the frequency analysis. Nuclear power generation was recognized as the most modern energy in the Thurstone Scale analysis. According to the analysis by sex, boys have a positive perception of nuclear power generation compared to girls. The most important perceived factor among the energy standards that meet SDG7 was the reliability of energy.

인터넷을 활용한 초등영어문화지도 모형 개발

하지훈 The English Linguistic Science Association of Kore 2002 English Linguistic Science Vol.8 No.-

The purpose of this study is to design a model for the development of ‘English lesson plans’ focusing on improvement of cultural understanding in elementary English education utilizing the Internet. This study examined the use of the Internet as a teaching tool for English culture education. The reasons for devising new lesson plans utilizing the Internet are as follows. First, in this fast-paced information era, the Internet allows people to study beyond time and space. The Internet is a necessity in daily life and will play a more leading role in education in terms of content and will be instrumental in the future. It is necessary for the nation and individuals to use the Internet in order to effectively study English. The Internet not only allows for the sharing of information but also drastically changes education of English. Second, it is important that learners understand English culture. It is necessary for learners to learn the target culture as well as the language in order to get rid of false stereotypes or misunderstandings about the target culture, and successfully communicate with native speakers. Third, learners use the Internet as a main source of educational media. There are many ways to learn the target culture in the process of English learning, but these have a number of limitations. One of the solutions to this program is the learning through the Internet. It is a valuable tool for learning the target culture in English learning, and to introduce the Internet as an efficient too for learning the target culture. In order to achiever the main purpose, a background for using the Internet for English education and culture teaching must be established and an investigation of the actual conditions of elementary schoolchildren should be conducted. From a review of research findings that analyzed students’ actual conditions, and English lesson plan for elementary schoolchildren was designed. The basic principles of this leson plan were based on the 7th English curriculum for elementary schools. The lesson plan combined linguistic competences and culture, the objectives of the unit. In conclusion, the results of this study show that the Internet is the most suitable way to teach and learn English. The contents of lesson plans are made of basic Internet-based activities for learners to experience culture-based activities with interest and practice language functions naturally and effectively. This method can also be adjusted both for on-line classrooms and for traditional off-line classrooms. I expect that this study will help Korean media education fields to research new media including multimedia like that on the Internet and introduce new methods of their own.