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무인항공기시스템의 실험분류 특별감항증명 제도에 관한 고찰
최미진,Choi, Mijin 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.4
Special airworthiness certificates can be issued if the aircraft does not meet the airworthiness standards, but it is deemed that it can be operated safely by partially limiting the scope of operation and flight performance. Currently, Korea is subject to experimental special certification for UAS(Unmanned Aircraft Systems) exceeding 150 kg of its own weight, but detailed guidelines need to be prepared on how to prove that they can be operated safely in a limited range. Recently, Korea Airworthiness Standard(KAS) Part 21 has been revised to reflect this, but it needs to be supplemented. In this study, through an understanding and analysis of the FAA's procedure of expeirmental special airworthiness certifications for UAS, we would like to suggest what we should consider when developing relevant guidelines in our country.
교란성분 모델링이 IMMU기반 자세추정 정확성에 미치는 영향
최미진,이정근,Choi, Mi Jin,Lee, Jung Keun 대한기계학회 2017 大韓機械學會論文集A Vol.24 No.2
9축 IMMU기반의 3차원 자세추정에 있어 대표적인 정확성 저하요인은 가속도계 신호를 교란시키는 외부가속도와 지자기센서 신호와 관련된 자기교란이라는 두 가지 교란성분이다. 교란성분에 의한 영향을 최소화하기 위해 모델링기반 기법과 스위칭 기법이 제안되어 왔고, 이를 비교한 연구도 진행된 바 있다. 그러나 모델링기반 기법에서 모델링의 차이가 자세추정 성능에 미치는 영향에 대한 연구는 현재까지 발표된 바 없다. 본 논문은 교란성분 모델링이 IMMU기반 자세추정 정확성에 미치는 영향을 확인하기 위해, 모델링에 차이가 있는 최근 발표된 두 알고리즘을 다양한 시험조건에서 비교하였다. 이를 통해 교란성분 모델링의 차이는 진행잡음 공분산 행렬에 차이를 발생시키며, 이로 인해 자세추정 성능에 영향을 끼칠 수 있음을 확인할 수 있었다. 시험결과 두 알고리즘은 평균제곱근오차에서 롤 피치 요평균 $1.35^{\circ}$ 및 요성분 $3.63^{\circ}$의 차이를 발생시켰다. In terms of 3D orientation estimation based on nine-axis IMMU(inertial and magnetic measurement unit), there are two disturbance components decreasing estimation accuracy: one is external acceleration disturbing accelerometer's signals and the other is magnetic disturbance related to magnetometer's signals. In order to minimize effects by these two disturbances, two approaches including switching approach and model-based approach have been suggested and further research comparing these two has also been conducted. Nevertheless, effect of disturbance modeling differences on orientation estimation accuracy in model-based approach has not been studied before. This paper compares the recently reported two orientation estimation algorithms that have difference in disturbance models, in order to investigate the effect of disturbance models on accuracy of IMMU-based orientation estimation under various operating conditions. This research shows that the difference in disturbance models leads to difference in process noise covariance matrix. Consequently, this affected the orientation estimation, i.e., the estimation differences between the algorithms were root mean square errors of $1.35^{\circ}$ in average and $3.63^{\circ}$ in yaw estimation.
우리나라 성인 흡연자 중 만성질환자의 금연의지 관련 요인: 국민건강영양조사 제7기 자료를 중심으로
최미진,최선주,정은영,유은영,Choi, Mi-Jin,Choi, Sun-Ju,Jung, Eun-Young,Yu, Eun-Young 한국디지털정책학회 2021 디지털융복합연구 Vol.19 No.7
본 연구는 만성질환을 앓은 성인 흡연자에서 금연 의지와의 연관성을 확인하고자 하며, 연구 방법은 국민건강영양조사 제7기(2016~2018) 자료를 활용하여 분석하였다. 대상자는 19세 이상 만성질환자 960명을 대상으로 빈도 분석, Chi-square test, 로지스틱 회귀분석을 실시하였으며 이는 SPSS 26.0 Program을 이용하여 분석하였다. 연구 결과 교육 수준에 따라 고등학교 졸업(OR=1.328, 95% CI=1.004-1.757), 대학교 졸업 이상(OR=1.556, 95% CI=1.167-2.075), 스트레스는 많을수록(OR=1.602, 95% CI=1.217-2.109), 금연 시도가 있었던 경우가(OR=5.263, 95% CI=4.287-6.462) 금연 의지와 연관이 있었다. 금연 의지가 높은 집단을 대상으로 적극적인 금연 프로그램 참여를 통해 흡연율을 감소시키며 적절한 스트레스를 해소할 방안을 마련하여 만성질환을 예방할 필요가 있다. This study aims to confirm the association with the willingness to quit smoking in adult smokers with chronic diseases, and the research method was analyzed using data from the 7th National Health and Nutrition Survey (2016-2018). The subjects were frequency analysis, chi-square test, and logistic regression analysis of 960 chronically ill patients aged 19 years or older, which were analyzed using the SPSS 26.0 Program. As a result of the study, depending on the level of education, high school graduation (OR=1.328, 95%CI=1.004-1.757), college graduation or higher (OR=1.556, 95%CI=1.167-2.075), the more stressed you are (OR=1.602, 95%CI) =1.217-2.109), there was an attempt to quit smoking (OR=5.263, 95% CI=4.287-6.462), which was associated with the willingness to quit smoking. It is necessary to prevent chronic diseases by reducing the smoking rate through active participation in smoking cessation programs targeting groups with high willingness to quit smoking, and by preparing measures to relieve appropriate stress.
정확한 방위각 추정을 위한 차수 변환 방식 자기왜곡 보상 메커니즘
최미진(Mi Jin Choi),이정근(Jung Keun Lee) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.7
One of the most problematic factors in inertial/magnetic sensing-based tilt/azimuth estimation is magnetic distortion that can be added in magnetometer signals and may decrease the azimuth estimation accuracy. In this paper, we propose an orderswitching magnetic distortion compensation mechanism for accurate azimuth estimation. The proposed compensation mechanism switches between a first-order Gauss-Markov (GM) model and a second-order GM model of magnetic distortion. When the secondorder model is selected, the time-derivative of the magnetic distortion is additionally augmented in the states of the corresponding second-order azimuth Kalam filter. The proposed mechanism was experimentally validated in four different magnetically distorted conditions. The results show that the azimuth estimation error of the proposed method was less than 3° in all the tests and the proposed mechanism outperformed conventional approaches in the azimuth estimation.
한국 근대소설과 연애담론 - 1920년대 「동아일보」 연재소설을 중심으로
최미진(Choi Mi-Jin),임주탁(Yim Ju-Tak) 한국문학회 2006 韓國文學論叢 Vol.44 No.-
This paper aims at studying the characteristics of the discourse on love in the serial novels published in newspapers, including Na Do-hyang"s The Drama of Illusion, Lee Hui-cheol"s Eup-hyul-jo and Yeom Sang-seop"s What Did You Get?, in the mid-1920s, when the Dong-A Ilbo served as a venue for a public discourse. Taking a closer look at the discourse on women prevalent in the Dong-A Ilbo at the time revealed that the discourse on women"s education and the discourse on women"s liberation had been undergoing a series of conflicts. The discourse on love in the serial stories published in newspapers showed similar characteristics as well.<BR> First of all, one thing the three novels have in common was that both the subject and the object of love were modern intellectuals. Modern knowledge meant conditions for love and qualifications to enjoy a modern culture. This has something to do with the reality of the time when the modern intellectuals emerged as a new group in power. It was problematic, however, that the subjects of love in the three novels embraced the internal coloniality in the process of accepting the modern knowledge.<BR> Second, the three novels considered the modern love of the West to be a standard and idealized the western model. Here lies the conflicts between the western-style romantic love, described as a standard, and Ellen Key"s free love and Henrik Ibsen"s Noraism.<BR> Third, it was virginity that was emphasized as a prerequisite for the subject of love, women. The loss of virginity in itself represented a fallen love, so those women were excluded from the objects of love. The novels took women"s moral degradation for granted, based on the sole and absolute criteria of virginity. This might be a result of putting the reality of the time in context, when the goal of education for women was to nurture a "wise mother and good wife."<BR> Fourth, money-centric materialism served as a major variant in a love relationship. Along with the loss of women"s virginity, materialism was facing a critical discourse, because it ran counter to the innocence of love.<BR> Fifth, the subjects of discourse in three of the two novels, except for Eup-hyul-jo, were male characters representing the viewpoints of authors. This might be because of the fact that it was men who wrote those three novels, but also because the male-centered attitude had a big influence on a love relationship. The novels had a modern thinking system of the "modernity/traditions or Japan/Joseon" in action, which was used as a logic to justify a modern love and a love marriage. They also had risks, however, of being exposed to or assimilated into the coloniality of the Japanese colonial rule, in that Japan was described to have a comparative advantage.