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설문조사에 근거한 전자파 발생원 주변 주민과 비주변 주민의 건강수준 평가
전형진,김윤신,윤정호,조남욱,손승우,Jeon, Hyung Jin,Kim, Yoon Shin,Yoon, Jeong Ho,Cho, Nam Wook,Son, Seoung Woo 한국환경보건학회 2014 한국환경보건학회지 Vol.40 No.5
Objective: The purpose of this study is to compare the health status of residents who were exposed to sources of extremely low frequency electromagnetic fields (ELF-EMFs) in the living environment and those who were not exposed to such a source of ELF-EMFs through a survey designed to appraise the residents' health levels. Method: Aimed at 251 residents exposed to a source of ELF-EMFs and 278 residents not exposed to a source, the survey was conducted to investigate the health status of the residents on the basis of questionnaire SF-36. Result: The health status scores of residents exposed to ELF-EMFs turned out to be lower than those of their counterparts. In terms of self-reported symptoms related to health and sleep quality, residents exposed to ELF-EMFs were found to have a higher complaint rate of self-reported symptoms such as dizziness, depression, and fatigue. Regarding sleep disorders, residents exposed to ELF-EMFs appeared to have a slightly higher complaint rate of sleep disorders compared to non-exposed residents. Conclusion: If a region is to be exposed to a source of ELF-EMFs, a more proactive policy for reducing such exposure is advised. In addition, it is necessary to better understand problems of residents by emplacing an ELF-EMFs risk information delivery system and building an efficient communication system for voluntary participation during the construction phase.
Production of Fuel Bioethanol Using 2-Step Pressure Swing Absorption Process
전형진(Jeon, Hyungjin),고경모(Go, Kyung-Mo),정준성(Jeong, Jun-Seong),최기욱(Choi, Gi-Wook) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
Recently, comsumption of fossil fuel is causing many problems(oilflation, global warming, environmental pollution). For this reason Renewable energy is now becoming the center of interest as a solution to these problems. Bioethanol, especially, is able to substitute petroleum as fuel; making it a viable and promising renewable energy. In order to production of fuel bioethanol, Dehydration process is essential. Azeotropic distillation, extractive and pressure swing absorption(PSA) process are some of possible dehydration process, out of which, PSA process is attractive since it required less energy and lower setup cost. In this study, we produced fuel bioethanol using 2-step PSA(3 bed + 2 bed) process for more efficient and economical process. Through this study, we produced fuel bioethanol using 2-step PSA process and concentration of fuel bioethanol was 99.54wt%(feed ethanol: 92.4wt%). We expected that because of efficient use of absorbents(zeolite), 2 step PSA process contribute to economical operation.
마이크로 유체 원심분리기의 입구 조건과 챔버 크기에 따른 회전 유동 성능 평가
전형진(Hyeong Jin Jeon),권봉현(Bong Hyun Kwon),김대일(Dae Il Kim),김형훈(Hyung Hoon Kim),고정상(Jeung Sang Go) 한국가시화정보학회 2014 한국가시화정보학회지 Vol.12 No.1
This paper describes the measurement of performance evaluation of rotational flow varying chamber size and Reynolds number. Through the experimental visualization of the flow rotation, the number and position of flow rotation in the 2x2 microfluidic centrifuge were examined. At a chamber width of 250 ㎛, single flow rotation was obtained over at a Reynolds number of 300, while at a chamber width of 500 ㎛, single flow rotation did not appear. For performance evaluation, the intensity in microchamber was measured during 20 sec. At a chamber width of 250 ㎛, performance of rotational flow increased as Reynolds number increased. However, the variation of intensity in microchamber remained unchanged at a chamber width of 500 ㎛. The numerical analysis showed that the threshold centrifugal acceleration to obtain rotational flow for ejected particles was 200g.
실험적으로 구한 MR 댐퍼의 개선된 Bouc-Wen 모델을 이용한 자동차 서스펜션 제어
전형진(Hyeong Jin Jeon),정슬(Seul Jung) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.2
This paper presents the modelling of an MR damper system through extensive experimental studies. The hysteresis of the MR damper is modelled by using the improved Bouc-wen model. A test bed for experimental studies of measuring parameters of the MR damper is designed and implemented. Based on the experimental data, the Bouc-Wen Model is modified for the MR damper system. To check the modelling property, a vehicle suspension system is controlled using a PID controller for the verification of the MR damper model.
전형진(Hyoung-Jin Jeon),어명근(Myong-Keun Eor),남민지(Min-JI Nam),이동필 한국농촌경제연구원 2011 한국농촌경제연구원 기본연구보고서 Vol.- No.-
Agricultural trade between Korea and China shows a clear one-way trade from China to Korea and consists mainly of inter-industry trade. The products available to intra-industry trade are rare with the exception of several processed foods. This overwhelmingly unbalanced trade structure makes it difficult for the two countries to avoid severe competition and build a mutually beneficial cooperative relationship in agricultural sector, and is not expected to change in the near future. Since the establishment of diplomatic relations between Korea and China in 1992, the share of grain in their bilateral agricultural trade has decreased, but the shares of vegetables and processed foods have increased. The pattern will set in because grain trade is quite restrictive to the supply and demand in the Chinese domestic market and most of fruits, vegetables, and livestock products trade are not allowed to trade because of inspection and quarantine barriers, which is not expected to be completely removed in the near future. The implications from our analyses on relevant issues in the agricultural trade structure between Korea and China are summarized as follows: First, Chinese agriculture is now on the stage of labor productivity-led growth and changes its production structure to the one relying on intermediate inputs gradually. Hence, the rises of input prices including agricultural wage and land rent are likely to threaten the price competitiveness of Chinese agricultural export. Second, China is a young market economy and the economy is not yet sophisticated enough due to the government"s frequent interventionist economic policies. Most of all, China still clings to the socialist system in politics. Thus, resource allocation in Chinese agricultural sector would be distorted by other factors rather than market principles. In this case, the prospect that the structural change in Chinese agriculture will follow a stylized path, through which developed countries already passed, will lead to a mistaken prediction of its change and then fail to properly act in the light of Korean agricultural sector. Third, the two countries have a similar production structure and a development course of agriculture, but also have distinctive resource endowments and growth stages, which led to the current overwhelming one-way trade that is expected to leave not much room for a complementary relation in the near future. It is necessary to find constructive cooperation plans between the trading partners towards co-prosperity under a more liberalized trade in the future, focusing on the establishment of a specialization system reflecting their comparative advantages in agricultural production.
수송기술에 관한 창의적 문제해결 능력을 함양하는 하이퍼루프 주제기반의 문제의 구조화 수준별 문제해결 체험활동 중심 수업 설계
전형진(Hyung-jin JEON),이상봉(Sang-bong YI) 대한공업교육학회 2022 대한공업교육학회지 Vol.47 No.2
이 연구의 목적은 수송기술에 관한 창의적 문제해결 능력을 함양하는 하이퍼루프 주제기반의 문제의 구조화 수준별 문제해결 체험활동 중심 수업의 설계를 위한 것으로 타일러의 수업 설계 4단계를 적용하여 수업을 설계하였으며, 각 단계를 통해 이루어진 수업 설계는 다음과 같다. 학습 목표의 설정 단계에서는 문헌 고찰을 통하여 학습자 요구, 환경요인, 문제의 구조화 수준, 수송기술 문제해결 체험활동 등을 분석하여 최종 주제로 ‘하이퍼루프’를 선정하고 학습 목표를 도출하였다. 학습경험의 선정 단계에서는 학습자의 수준을 고려하고 학습 목적을 달성하기 위한 과제를 선정하여 과제의 구조화 수준, 구조화 수준별 세부 목표 등을 설정하였으며, 학습경험의 조직 단계에서는 구조화 수준별 활동 내용 조직, 지도 방법, 수업 활동 및 유의사항, 수업단계와 절차, 단계별 시간 배정, 그리고 교수자료와 학습자료 등을 설계하였다. 학습 성과의 평가 단계에서는 평가도구를 개발하였다. 설계된 수업은 신뢰도와 타당도를 검증하기 위해 기술 교육 분야 전문가와 하이퍼루프 분야 현장 전문가 자문을 통해 수정·보완하여 총 10차시로 수업을 설계하였다. The purpose of this study is to design a class focused on problem-solving experiential activities by level of structuring of hyperloop topic-based problems that cultivate creative problem-solving skills related to transportation technology. The lesson design made through each stage is as follows. In the learning goal setting stage, through literature review, learner needs, environmental factors, problem structuring level, transportation technology problem solving experience activities, etc. were analyzed to select "hyperloop" as the final topic and derive learning goals. In the learning experience selection stage, the level of structuring of the task and detailed goals for each structuring level were set by considering the learner"s level and selecting tasks to achieve the learning purpose. , class activities and notes, class steps and procedures, time allocation for each step, and teaching materials and learning materials were designed. In the evaluation stage of learning outcomes, evaluation tools were developed. In order to verify the reliability and validity of the designed class, a total of 10 classes were designed by modifying and supplementing them with advice from experts in the field of technical education and field experts in the field of hyperloop.