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무인 항공기의 자동 착륙 접근 알고리즘 설계 및 비행시험
정민정(Minjeong Jeong),류한석(Han-seok Ryu),박상혁(Sanghyuk Park) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.6
본 논문에서는 무인 항공기의 활주로 자동 접근 알고리즘에 대해 기술하였다. 본 연구에서 자동 접근의 주요 목적은 야간에 항공기의 안전한 착륙을 돕기 위함이다. 자동 접근 기능을 사용하게 되면 항공기가 어느 위치에 있던 초기 위치를 기준으로 경로 명령이 생성된다. 경로 명령은 최단거리를 가지는 원호-직선-원호로 구성되어있다. 경로 명령을 통해 생성된 경로를 따라 이동한 다음 활주로에 접근하도록 알고리즘을 설계하였다. 항공기의 다양한 초기 위치에 대한 경로 생성 알고리즘의 시뮬레이션을 통해 1차 검증을 하였으며 이를 기반으로 실제 비행시험을 수행하여 본 연구에서 제안한 알고리즘의 타당성을 실증적으로 검증하였다. This paper presents an algorithm for autonomous landing approach of a unmanned aerial vehicle. The main purpose of the autonomous landing approach in this study is to help a safe landing at night. From any initial position of the aircraft when this function is engaged, a flight path command is generated from the initial position. The shortest combination of an initial circular arc, a straight line segment, and a final circular arc is chosen for the flight path that will lead the aircraft to one end of runway for a landing. The algorithm is initially validated through numerous simulations with various initial conditions of aircraft. Then it is successfully validated through a number of flight tests.
김민정(Minjeong Kim),권진호(Jinho Kwon),김병오(Byungo kim),박근령(Geunryung Park),양지연(Jiyeon Yang),이영현(Younghyun Lee),정주환(Juhwan Jeong),정형식(Hyungsik Jeong),한유리(Yuri Han),강세식(Sesik Kang) 한국방사선학회 2015 한국방사선학회 학술대회 논문집 Vol.2015 No.추계
본 논문에서는 일반적인 전후방향 검사가 힘든 경우 대체 할 수 있는 후전방향 검사의 임상적 유용성을 알아보고자 한 다. 설문조사 실험은 부산지역 P병원 에 내원하거나 방문한 환자 중 2015년 3월 5일부터 한 달간 복부 검사를 시행한 환자를 대상으로 각각 전후방향, 후전방향 두 가지 검사와 거리 100 cm, 180 cm의 4가지의 자료를 수집하였다. 설문조사는 5년 이상 근무한 방사선사 18명, 영상의학과 의사 2명에게 영상의 화질평가, 환자의 안정성 및 촬영 효율성을 기준 으로 총 17문항으로 영상평가를 의뢰하였다. 입사표면선량 측정 실험은 복부팬텀과 측정기를 사용하여 전후방향, 후전방 향 두 가지 검사 각각 거리 100 cm, 180 cm로 실험의 재현성을 위해 다섯 번씩 검사하였다. 각 검사법의 설문조사 결과 로 100 cm 전후방향검사와 180 cm 후전방향검사를 비교하면 영상화질 0.7점, 환자 안정성 측면 1점 차이로 180 cm 후전방향검사가 더 높은 평가를 받았다. 거리에 따른 입사 표면 선량 측정 시 100 cm 전후방향검사의 선량에 비해 180cm 전후방향검사는 0.2708 mGy, 180 cm 후전방향검사는 0.2718 mGy의 차이로 두 검사 모두 거리가 100 cm에서보다 180 cm일 때 입사표면선량이 감소하였다. 일반적인 검사법인 전후방향 검사가 힘든 응급환자나 선자세가 불편한 환자의 경우에 후전방향 검사를 이용하여 환자의 낙상사고를 줄이고 거리를 증가시켜 환자의 피폭선량을 줄이고 방사선사의 업무효율을 증진시킬 수 있을 것으로 사료된다. This paper is going to look into clinical usefulness of PA Position tests, which may be substituted in cases of the AP Position test is unable. For about a month starting from March 5, 2015, a survey experiment of people hospitalized or visitors in 'P' hospital in Busan collected four kinds of information about tests of AP Position and PA Position and distances of 100 cm and 180 cm. The survey, which included a total of 17 questions, was evaluated by 18 radiological technologists with at least 5 years of work experience and 2 doctors from Department of Diagnostic Radiology. The standards were sharpness of the picture, safety of the patients, and efficiency of the shooting process. Abdominal Phantom and a measuring instrument was used for AP Position and PA Position in distances of 100 cm and 180 cm to measure ESD. For reproducibility, the tests were conducted five times each. Comparing the 100 cm AP Position image and 180 cm PA Position image, the 180 cm PA Position method showed a better result in higher definition of the image by 0.7 points and safety of the patients by 1 point. During the measurement of ESD by distance, the 100cm AP Position method indicated a 0.2708 mGy decrease compared to the 180cm AP Position method and a 0.2718 mGy decrease compared to the 180cm PA Position tests. For patients with difficulty of examination by the common AP Position method such as emergency patients or patients who are unable to stand properly, it can be considered that using the PA Position testing can prevent falling accidents, increasing the distance can reduce radiation exposure, and enhance work efficiency of radiological technologists.
( Minjeong Kim ),( Haengdueng Jeong ),( Buhyun Lee ),( Yejin Cho ),( Won Kee Yoon ),( Ahreum Cho ),( Guideock Kwon ),( Ki Taek Nam ),( Hunjoo Ha ),( Kyung-min Lim ) 한국응용약물학회 2019 Biomolecules & Therapeutics(구 응용약물학회지) Vol.27 No.5
Patients with diabetes mellitus (DM) often suffer from diverse skin disorders, which might be attributable to skin barrier dysfunction. To explore the role of lipid alterations in the epidermis in DM skin disorders, we quantitated 49 lipids (34 ceramides, 14 free fatty acids (FFAs), and cholesterol) in the skin epidermis, liver, and kidneys of db/db mice, a Type 2 DM model, using UPLC-MS/MS. The expression of genes involved in lipid synthesis was also evaluated. With the full establishment of hyperglycemia at the age of 20 weeks, remarkable lipid enrichment was noted in the skin of the db/db mice, especially at the epidermis and subcutaneous fat bed. Prominent increases in the ceramides and FFAs (>3 fold) with short or medium chains (<C26) occurred in the skin epidermis (16NS, 18NS, 24NS, 16NDS, 18NDS, 20NDS, 22NDS, 24NDS, C16:1FA, C18:2FA, and C18:1FA) and the liver (16NS, 18NS, 20NS, 24:1NS, 18NDS, 20NDS, 22NDS, C16:1FA, C18:2FA, C18:1FA), whereas those with very long chains were not affected. In the kidney, only slight increases (<3 fold) were observed for 16NS, 18NS, 20NS, 26NDS, C26FA, and C22:1FA. Consistently, LXRα/β and PPARγ, nuclear receptors promoting lipid synthesis, lipid synthesis enzymes such as elongases 1, 4, and 6, and fatty acid synthase and stearoyl-CoA desaturase were highly expressed in the skin and livers of the db/db mice. Collectively, our study demonstrates an extensive alteration in the skin and systemic lipid profiles of db/db mice, which could contribute to the development of skin disorders in DM.
Minjeong Jung,So Young Bu,Ka-Hee Tak,Jeong-Eun Park,Eunjung Kim 한국영양학회 2013 Nutrition Research and Practice Vol.7 No.6
It has been shown that dysregulation of IGF-1 signaling is associated with tumor incidence and progression, whereas blockade of the signaling can effectively inhibit carcinogenesis. Although several mechanisms of anticancer activity of quercetin were proposed, molecular targets of quercetin have not been identified yet. Hence, we assessed the effect of quercetin on IGF-1 signaling inhibition in BK5.IGF-1 transgenic (Tg) mice, which over-expresses IGF-1 in the skin epidermis. A quercetin diet (0.02% wt/wt) for 20 weeks remarkably delayed the incidence of skin tumor by 2 weeks and reduced tumor multiplicity by 35% in a 7,12-dimethylbenz(a)anthracene (DMBA)-tetradecanoyl phorbol-13-acetate (TPA) two stage mouse skin carcinogenesis protocol. Moreover, skin hyperplasia in Tg mice was significantly inhibited by a quercetin supplementation. Further analysis of the MT1/2 skin papilloma cell line showed that a quercetin treatment dose dependently suppressed IGF-1 induced phosphorylation of the IGF-1 receptor (IGF-1R), insulin receptor substrate (IRS)-1, Akt and S6K; however, had no effect on the phosphorylation of PTEN. Additionally, the quercetin treatment inhibited IGF-1 stimulated cell proliferation in a dose dependent manner. Taken together, these data suggest that quercetin has a potent anticancer activity through the inhibition of IGF-1 signaling.
( Minjeong Kim ),( Ji Seong Jeong ),( Hyunji Kim ),( Seungwoo Hwang ),( Il-hyun Park ),( Byung-chul Lee ),( Sung Il Yoon ),( Sun Ha Jee ),( Ki Taek Nam ),( Kyung-min Lim ) 한국응용약물학회 2018 Biomolecules & Therapeutics(구 응용약물학회지) Vol.26 No.5
Phthalates widely used in the manufacture of plastics have deeply penetrated into our everyday lives. Recently, a concern over the toxicity of phthalates on thyroid, has been raised but in most of cases, the doses employed were unrealistically high. To investigate the effects of phthalates on thyroid, we investigated the effects of the repeated oral exposure to low to high doses (0.3, 3, 30 and 150 mg/kg) di-2-ethylhexylphthalate (DEHP) from weaning to maturity for 90 days in juvenile rats on the thyroid. The histological examination revealed that DEHP significantly induced hyperplasia in the thyroid from the doses of 30 mg/kg, which was confirmed with Ki67 staining. In line with this finding, increased mRNA expression of thyrotropin releasing hormone (Trh) was observed in the thyroid of female at 0.3 mg/kg and 150 mg/kg as determined by RNAseq analysis. Moreover, significantly increased expression of parathyroid hormone (Pth) in the female at 0.3 mg/kg, and thyroglobulin (Tg) and thyroid hormone responsive (Thrsp) in the male at 0.3 mg/kg were noted in the blood, of which changes were substantially attenuated at 150 m/kg, alluding the meaningful effects of low dose DEHP on the thyroid hormone regulation. Urinary excretion of mono-2-ethylhexyl-phthalate (MEHP), a major metabolite of DEHP was determined to be 4.10 and 12.26 ppb in male, 6.65 and 324 ppb in female at 0.3 and 30 mg/kg DEHP, respectively, which fell within reported human urine levels. Collectively, these results suggest a potential adverse effects of low dose phthalates on the thyroid.