국내ㆍ외 자동차 실내공기질 관련 연구 동향

이현우(Hyunwoo Lee),최영태(Youngtae Choi),이광범(Kwangbum Lee),이정기(Jeongki Lee),김광일(Kwangil Kim),이정화(Jeongwha Lee),임종순(Jongsoon Lim),신영복(Youngbok Sin) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

All across our nation, people live, work, and learn in indoor environments and especially, many people spend more time than ever before inside of cars. Recent years have been increasing attention focused on the air contamination inside auto-cabin. The sources of air contamination inside auto-cabin are roughly divided into internal sources(ex. chemical compounds from interior material) and external sources(ex. tail-pipe emission etc.). The Purpose of this research is to examine the status of worldwide auto-cabin air quality study, and to give the information when research is intended to develop methods to mitigate indoor air problem from auto-cabin.

A 5.8-GHz DSRC Transceiver With a 10-<tex> $\mu{\hbox {A}}$</tex> Interference-Aware Wake-Up Receiver for the Chinese ETCS

Jeongki Choi,In-Young Lee,Kanghyuk Lee,Seok-Oh Yun,Joomyoung Kim,Jinho Ko,Giwan Yoon,Sang-Gug Lee Professional Technical Group on Microwace Theory a 2014 IEEE Transactions on Microwave Theory and Techniqu Vol. No.

<P>This paper presents a fully integrated 5.8-GHz dedicated short-range communication transceiver with a 10- μA interference-aware wake-up receiver (WuRx) for Chinese electronic toll collection system terminals that can operate with a low standby and operating current consumption. To reduce the current consumption, a high-gain RF envelope detector using a voltage-boosting method is proposed for both the WuRx and receiver (Rx) while the proposed high-power ASK modulator extends output dynamic range in low power consumption. Additionally, a delay-based bandpass filter is adopted in the WuRx to filter out interference from automotive applications, thus increasing the battery lifetime by reducing the probability of a false wake-up. The proposed transceiver is fabricated using 0.13- μm CMOS technology with a chip size of 2.8 mm<SUP>2</SUP> for the target frequency range of 5.8 GHz. The measured results demonstrate sensitivities of -44 and -61 dBm for the WuRx and Rx, dissipating currents of 10 μA and 19 mA from 3.3-V supply voltage, respectively. The transmitter exhibits a normal output power of +5 dBm at an operating current of 46 mA.</P>

Fabrication of low-g MEMS acceleration switch using SOI-Glass bonding

Jeongki Hwang(황정기),Sukwon Jang(장석원),Sungryeol Lee(이성렬),Chumg-il Lee(이충일),Seung-Gyo Jang(장승교),Yong-Kweon Kim(김용권) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.11

Communication architecture design for reconfigurable multimedia SoC platform

Lee, Ganghee,Ahn, Yongjin,Lee, Seokhyun,Son, Jeongki,Yoon, Kiwook,Choi, Kiyoung Springer-Verlag 2010 Design automation for embedded systems Vol.14 No.1

Kinetic Analysis of the Dwigongjungdorachagi in Taekwondo

Jeongki Lee,Hyotaek Lee,Boseob Heo J-INSTITUTE 2022 International Journal of Martial Arts Vol.7 No.1

Purpose: The purpose of this study is to provide the basic data for technical performance by analyzing and presenting the differences in major kinematic factors in the jumping phase, flight phase, and finally striking phase for national team and non-national team male demonstration members. Method: As for the subjects of this study, 6 members of the national team and 6 members of the non-national team who had more than 3 years of demonstration experience were selected and tested. Before entering the ex-periment, a consent was secured from each subject, the experimental procedure was explained, and kinematic data were collected by using 14 high-speed digital cameras. For the statistical processing of this study, the mean and standard deviation (M±SD) were calculated by using Excel 2018, and the statistical program (SPSS 22.0, SPSS Inc., Chicago, IL, USA) was used to verify the difference in kinematic variables of dwigongjungdorachagi motion. The Shapiro-Wilk verification was conducted to confirm the normality of the collected data, and according to the results, an independent sample test (independent t-test), test (Mann-Whitney U-test), and the correlation analysis were performed. Results: There was a statistically significant difference in P3 (p<.05) of the required time phase. There was a statistically significant difference in E4 (p<.05) of the (Z) movement displacements. There was a statistically significant difference in the right E4 (p<.05) of the right ankle joint angle. The correlation coefficient between the body center’s displacement and flight time showed a high correlation and showed a statistically significant difference (r=.953, P=.001). The correlation coefficient between the angular velocity and the body center’s displacement showed a high correlation and showed a statistically significant difference (r=.809, p=.001). The correlation coefficient between the angular velocity and flight time showed a high correlation and a statistically significant differ-ence (r=.809, p=.001). Conclusion: As a result of the experiment, the swing speed of the arm and the angle of the knee joint before jumping during dwigongjungdorachagi provided a great force to project the human body into the air and also had the effect of increasing vertical ascent. Hence, it is apparent that the coordination of movements is a very important factor.

해양 재해쓰레기 수거량 현황 및 발생원 분석

이정기(JeongKi LEE),박세완(Sewan PARK),하윤진(Yoon-Jin HA),오정환(Jeong-Hwan OH) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10

해양쓰레기 유입은 육상기인과 해상기인 쓰레기로 구분되며, 주로 육상기인 해양쓰레기는 강을 통해 유입되며 해상기인 해양쓰레기는 선박, 양식시설, 어장 등 해상활동 중에 버려지거나 유실되어 해상에 유입된다. 제3차 해양쓰레기 관리 기본계획수립을 위한 연구에 따르면, 매년 해양으로 유입되는 해양쓰레기는 홍수기 재해쓰레기 약 62천톤을 포함하여 육상기인 해양쓰레기 약 95천톤이 유입되며, 해상기인 약 50천톤으로 총 145천톤으로 추정하고 있다. 정부는 매년 수거사업을 통해 약 69천톤의 해양쓰레기를 수거하고 있으며, 특히 홍수 및 태풍 등 재해의 영향으로 발생한 항 및 해안가 재해쓰레기 약 4천톤을 수거하고 있다. 본 연구에서는 해양 재해쓰레기 수거량 정보(2009-2018)를 기반으로, 해양쓰레기의 기원을 파악하고자 한다. 지역별 해양 재해쓰레기 수거 누적량은 전남지역(56,026톤)이 가장 많았으며 경남, 충남, 경북 순으로 나타났다. 년도 별로는 6년(2010, 2011, 2012, 2016, 2017, 2018)에서 많은 수거량을 보였으며, 이는 2017년을 제외하고는 태풍이 발생한 년도와 잘 일치하는 것을 알 수 있다. 수거량이 가장 높은 2012년도에는 7~9월 동안 태풍이 3개가 발생하였으며, 전남, 경북, 경남, 충남 4개 해역에서 많은 해양 재해쓰레기가 수거되었으나, 3개의 태풍이 발생한 2010년 경남과 충남, 2018년도에는 전남과 충남 해역에서 많은 해양 재해쓰레기가 수거되었다. 또한, 태풍이 발생한 2013, 2014, 2015년도에 해양 재해쓰레기 수거량은 아주 적은 것으로 나타났다. 이는 태풍 경로와 크기 등 우리나라 해역에 직접적인 영향을 미치지 않은 것으로 판단된다. 특히, 2017년은 태풍이 발생하지 않았음에도 충남지역에서만 해양 재해쓰레기 수거량이 높게 나타났는데, 이는 해상기인 재해쓰레기 보다는 집중호우로 인한 육상기인 재해쓰레기 수거와 관련이 있다고 판단된다. 본 연구를 통해, 해양 재해쓰레기 발생은 태풍 및 홍수 발생과 밀접한 관계가 있음을 알 수 있다. 향후, 태풍 이동 경로 및 강도에 따른 양식설비의 분포와 영향으로 인한 해상기인 해양 재해쓰레기 발생량 추정과 육상기인 수거량 정보를 추가적으로 고려하여 해양 재해쓰레기 기원을 평가하고자 한다. The inflow of marine debris is divided into land-based and marine-based sources. Mainly land-based debris inflows through rivers, and marine-based debris is thrown into the sea or lost during maritime activities such as ships, aquaculture facilities, and fishing grounds. According to “A Study for the Establishment of the 3rd Marine Litter Management Basic Plan”, it is estimated that a total of 145 thousand tons of debris flows into the ocean every year with about 50 thousand tons of marine-based debris and about 95 thousand tons of land-absed debris including 62 thousand tons of disaster waste during the flood season. The government collects about 69 thousand tons of marine debris every year through the collection project, and in particular about 4 thousand tons of debris from disasters such as floods and typhoons in ports and coastal areas. In this study, the origin of marine debris is to be identified based on the amount of marine disaster debris collected (2009-2018). Jeonnam (56,026 tons) shows the largest amount of marine disaster debris collection by region, followed by Gyeongnam, Chungnam, and Gyeongbuk. By year, high amount of collection was seen in 6 years (2010, 2011, 2012, 2016, 2017, 2018) and it shows a good agreement with the year of typhoon except for 2017. In 2012, when the amount of collection was the highest, three typhoons occurred between July and September, and the amount was mainly collected from four regions in Jeonnam, Gyeongbuk, Gyeongnam, and Chungnam. However, high amount of marine disaster waste was mainly collected from the 2 regions of Gyeongnam and Chungnam in 2010 and from the 2 regions of Jeonnam and Chungnam in 2018 even though the same number of typhoon occurred in 2012. In addition, the amount of marine disaster debris collected in 2013, 2014, and 2015, when typhoons occurred, was found to be very low. It is caused the path and intensity of the typhoon did not directly affect the Korean waters. In particular, the amount of marine disaster debris collection was high only in the Chungnam region even though there was no typhoon in 2017. It is caused that this is related to the amount of marine disaster debris from land-based sources during the flood season rather than marine-based disaster debris. Through this study, it can be seen that the occurrence of marine disaster debris is closely related to the occurrence of typhoons and floods. In the future, It will be evaluated the origin of marine disaster waste by considering the estimation of the amount of marine disaster debris from marine-based sources due to the distribution and influence of aquaculture facilities according to the path and intensity of the typhoon and information on the amount collected from land-based sources.

대학생들의 전공영역 플립러닝형 영어 전용강의 수강의도 결정요인 연구

이정기(Jeongki Lee) 동국대학교 영상문화콘텐츠연구원 2018 영상문화콘텐츠연구 Vol.15 No.-

이 연구는 이용과 충족 이론, 기술수용모델, 계획행동이론의 융합모델인 IMTBPT 모델을 활용하여 대학생들의 전공영역 플립러닝형 영어 전용강좌 수강의도 결정요인을 확인해 보고자 했다. 이를 통해 대학생들의 플립러닝형 영어 전용강좌 수강의도를 높이기 위한 대학, 교수 차원의 전략에 대한 함의를 제시하고자 한 것이다. 이 연구의 결과는 다음과 같다. 첫째, 이러닝 수강동기는 학습 자율성, 학습 용이성, 학습 콘텐츠 우수성 동기 등 3개로 나타났다. 둘째, 이러닝 수강동기 중 학습 자율성(-), 학습 콘텐츠 우수성(+) 동기는 플립러닝형 전공영역 영어 전용강의 수강의도에 영향을 미쳤다. 셋째, 플립러닝형 영어 전용강좌에 대한 인식 중 전공 능력에 대한 인식(+)과 영어 능력에 대한 인식(-)은 각각 플립러닝형 전공영역 영어 전용강의 수강에 대한 태도와 수강의도에 영향을 미쳤다. 넷째, 기술수용모델 변인 중 용이성은 유용성에 정적 영향을 미쳤고, 유용성과 용이성은 플립러닝형 전공영역 영어 전용강의 수강에 대한 태도에 정적 영향을 미쳤다. 유용성은 플립러닝형 전공영역 영어 전용강의 수강의도에 정적인 영향을 미쳤다. 다섯째, 계획행동이론을 구성하는 3가지 변인 모두 플립러닝형 전공영역 영어 전용강의 수강의도에 정적인 영향을 미쳤다. This study set out to identify the determinants of college students’ intention to take flipped learning-type EMI courses in their majors and to provide implications for the strategies of universities and professors to increase the intention to take such courses. The findings were as follows: First, college students had three motivations to take an e-learning course: autonomy of learning, ease of learning, and excellence of learning content. Second, of their motivations to take an e-learning course, autonomy of learning(-) and excellence of learning content(+) had effects on their intention to take a flipped learning-type EMI course in their major. Third, of their perceptions of flipped learning-type EMI courses, their perception of their major abilities(+) and their perception of their English skills(-) had impacts on their attitude and intention. Fourth, of the variables of the TAM, easiness had positive impacts on usefulness. In addition, usefulness and easiness had positive effects on the college students’ attitude. Usefulness also had positive effects on their intention to take such a course. Finally, all the variables of the Theory of Planned Behavior had positive influences on their intention.

표면 수화도에 따른 불포화토의 포아송비 변화

이정기(Lee, Jeongki),김윤태(Kim, Yun-Tae) 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

IEC TS 62600-102 : 제2장소 파력발전 발전성능평가

이정기(JeongKi Lee),김정석(Jeong Seok Kim),최종수(Jongsu Choi),김길원(Kilwon Kim),박지용(Ji Yong Park) 한국해양환경·에너지학회 2018 한국해양환경공학회 학술대회논문집 Vol.2018 No.5

언론인 해고 관련 판결의 특성과 판결에 나타난 법원의 ‘언론의 자유’ 인식, 한계에 관한 탐색적 연구

이정기(Jeongki Lee) 한국언론학회 2015 한국언론학보 Vol.59 No.4