Lv 4+ 자율주행 테스트 시나리오 개발을 위한 자율주행차량 위험 사례 분석 : 인지 음영을 중심으로

오승민,최재희,장기태,윤진원 한국ITS학회 2024 한국ITS학회논문지 Vol.23 No.2

자율주행차량(AV)의 기술 발전으로 실도로 내 자율주행이 가능해졌지만, 주변 요소로 AV 의 인지 범위 또는 능력이 제한되는 인지 음영으로 완전한 자율주행에 어려움이 있다. 오늘날 Lv 4+ 자율주행 테스트 시나리오를 개발하기 위해서는 실제 도로에서 발생할 수 있는 다양한 인지 음영 상황을 파악하고 대비 전략을 구상하는 것이 중요하다. 따라서, 본 연구는 미국 캘리 포니아 차량관리국(DMV)의 AV 사고 데이터를 통해 자율주행 모드 활성화 여부에 따라 AV와 일반차량의 사고 형태와 특성을 비교하고, AV 제어권 전환 데이터를 단계적으로 분류하여 인 지 음영으로 인한 제어권 전환의 유형과 실제 사례를 도출하였다. 분석 결과, AV의 안전 운전 기동으로 일반 차량과 다른 사고 유형이 나타났으며, 3가지 유형의 인지 음영 사례를 파악하였 다. 본 연구 결과는 Lv 4+ 자율주행 테스트 시나리오 개발의 중요한 기초자료가 될 것이며, 다양한 인지 음영이 고려된 테스트 시나리오를 통해 상황별 인지 음영을 해소하는 효율적인 전략을 마련할 수 있다. 이를 통해 실제 도로에서의 AV 주행 안전성을 효과적으로 평가하고 향상할 수 있을 것으로 기대된다. With the advancement of autonomous vehicle (AV) technology, autonomous driving on real roads has become feasible. However, there are challenges in achieving complete autonomy due to perceptual blind areas, which occur when the AV’s sensory range or capabilities are limited or impaired by surrounding objects or environmental factors. This study aims to analyze AV accident patterns and safety issues of perceptual blind area that may occur in urban areas, with the goal of developing test scenarios for Level 4+ autonomous driving. It utilized AV accident data from the California Department of Motor Vehicles (DMV) to compare accident patterns and characteristics between AVs and conventional vehicles based on activation status of autonomous mode. It also categorized AV disengagement data to identify types and real-world cases of disengagements caused by perceptual blind areas. The analysis revealed that AVs exhibit different accident types due to their safe driving maneuvers, and three types of perceptual blind area scenarios were identified. The findings of this study serve as crucial foundational data for developing Level 4+ autonomous driving test scenarios, enabling the design of efficient strategies to mitigate perceptual blind areas in various scenarios. This, in turn, is expected to contribute to the effective evaluation and enhancement of AV driving safety on real roads.

Long-term Contact Angle Variation of Various Liquids by Interconnected Reentrant Structures

오승민,김석,조영태 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.5

웨이트트레이닝에 의한 체지방 감소가 개인적인 특성과 피부두겹 변화에 미치는 영향

오승민 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.11

This study proposes an efficient weight training strategy to reduce body fat, by identifying the effects of weight training on body fat reductions based on individual characteristics and changes in skinfold thickness. We analyzed the effects of 12-weeks weight training on changes in skinfold thickness and the resulting body fat reductions by considering individual traits of the subject. Our results indicate that individual characteristics have no statistically significant effects on changes in skinfold thickness, but were statistically significant for changes in the amount of body fat. Second, changes in skinfold thickness showed statistically significant effects on changes in body fat. Third, weight training induced changes in skinfold thickness were more significant in men than in women. Men also exhibited greater changes in body fat than women after weight training. Taken together, these findings confirm that changes in skinfold thickness and body fat observed through the 12-week weight training had variations depending on individual characteristics, and changes in skinfold thickness significantly affect the changes in body fat. The weight training program proposed by this study considers incorporation of individual characteristics, rather than accomplishing the same outcome with uniform methods and amounts of training. Furthermore, this program induces changes in skinfold thickness before implementing random efforts for reducing body fat. 본 연구는 12주간 웨이트트레이닝에 의한 체지방 감소가 개인적인 특성과 피부두겹의 변화 등에 어떠한 영향을 미치고 있는지를 분석하여 보다 효과적인 웨이트트레이닝 전략을 제안한 연구이다. 분석결과 첫째 개인특성이 피부두겹의 변화에 유의한 영향을 미치지 않았으나 체지방 변화에는 높은 수준의 영향을 미치는 것으로 나타났다. 둘째, 피부두겹의 변화는 체지방 변화에 통계적으로 유의한 영향을 주었다. 셋째, 웨이트트레이닝에 의한 피부두겹의 변화는 남성이 여성에 비해 상대적으로 높은 변화수준을 보였다. 체지방 변화에 있어서도 남성이 여성에 비해 높은 변화를 보이는 것으로 나타났다. 본 결과를 종합하면 12주간의 웨이트트레이닝을 통해 나타난 피부두겹과 체지방의 변화는 개인특성에 의해 수준의 차이가 존재하고 있으며, 피부두겹의 변화는 체지방 변화에 높은 수준의 영향을 미치고 있음을 확인할 수 있다. 이는 본 연구의 웨이트트레이닝 프로그램은 획일적인 방법과 양으로 같은 성과를 나타내려는 노력보다는 개인특성에 맞는 웨이트트레이닝의 시간, 양, 수준을 고려한 규칙적인 웨이트트레이닝 프로그램을 실시한다면 현대인의 비만 문제를 해결하고, 건강관련 체력을 향상시키는데 보다 긍정적인 영향을 미칠 것으로 생각된다.

한강 상류지역 고랭지밭 흙탕물 발생 관리, 강원지역 「비점오염관리 연구·지원센터」가 앞장선다!

오승민,김동진 한국농공학회 2021 韓國農工學會誌 : 전원과 자원 Vol.63 No.1

코로나19에서의 대학생활 적응에 대한 신입생의 인식유형 연구: B대학 사회복지학과 신입생을 중심으로

오승민 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.12

Objectives The purpose of this study was to investigate the freshmen experiences and perceptions on college life while adjusting to the COVID-19 pandemic. Methods The P-sample consisted of 33 full-time freshmen enrolled in the department of social welfare. Using Q-methodology, these students categorized 34 Q-sample statements from October 1 to 20. Results Analyzing the scores from the 34 statements using Q factor analysis through QUANL-PC program, freshmen perceptions on college life adjustment were classified into three types: (a) showing approval of online learning but preferring for face to face learning and having low academic achievement, (b) showing adaptive online learning but pursuing face to face learning and having moderate academic achievement, (c) showing adaptive online learning and having high academic achievement. Conclusions Result of this study suggests that actual online learning is needed to better evaluate the benefits, challenges and useful strategies of successful students and to revised in order to help freshmen to successfully adjust to college life, improve academic performance and develop employee competencies. 목적 본 연구는 Q방법론을 적용하여 코로나19의 팬데믹에서 B대학 신입생이 인식하는 대학생활 적응에 대한 유형을 분류하고 각유형별 특성과 차이점을 분석하였다. 방법 문헌분석과 B대학 사회복지학과 신입생을 대상으로 2차례 표적집단인터뷰와 반구조화 질문지를 통한 설문조사를 실시하여총 185개의 진술문을 추출하였다. 이후 전문가 협의 및 토의를 통해 34개의 Q표본을 선정하였다. B대학의 사회복지학과 신입생33명의 P표본에게 2021년 9월 1일부터 9월 20일까지 Q분류를 하게 하였고 이를 QUANL-PC 프로그램을 이용하여 요인분석을실시하였다. 결과 코로나19의 팬데믹에서 B대학 신입생이 인식하는 대학생활 적응에 대한 유형은 3가지로 추출되었다. 유형 1은 ‘부적응형’으로 비대면 학습 환경에는 수용적이나 대학생활 전반에 대한 아쉬움이 있고 학업성취에 어려움이 있는 것으로 나타났다. 유형 2는‘대면 선호 적응형’으로 대면 학습환경에 대한 아쉬움이 크고 비대면 학습 환경에서의 학습관리에 다소 어려움이 있으나 학업 전반에걸쳐 적응적인 모습을 보였다. 유형 3은 ‘적응형’으로 비대면 학습 환경에 적응적이고 학습관리를 잘하며 학업성취도가 높고 취업에매우 적응적인 모습을 보이는 것으로 나타났다. 결론 연구결과를 바탕으로 위드코로나의 시대에 신입생의 대학생활 적응을 도울 수 있는 학습자 중심의 학습환경 구축을 통한 원활한 학업성취와 취업역량 증진에 대한 실제적인 방안에 대해 논의하였다.

의과대학생의 멘토링 프로그램 필요 요구 및 희망 진로와의 연관성

오승민,신홍임,전우택,양은배,Oh, Seung-Min,Shin, Hong-Im,Jeon, Woo-Taek,Yang, Eun-Bae 연세대학교 의과대학 2008 의학교육논단 Vol.10 No.2

Purpose & Method : To describe medical students' need on the mentoring program and relationship with career choice, 186/251 (74.1%) of first-and second-year medical students at Yonsei University College of Medicine. Seoul. Korea were surveyed. Result : 66.1% of medical students replied that he/she would volunteer as a mentee in mentoring program. Medical students' need area in mentoring program was specialty choice (62.9%). research development(18.8%), adapting to school life (13.9%) and effective learning skill (2.7%). 47.2% of medical students replied that his/her wishful career and working place is university faculty. Medical students who replied that he/she would volunteer as a mentee showed more needs on the research mentoring program(P=0.0112) and faculty career(P=0.0185) than those who replied that he/she would not volunteer as a mentee. Conclusion For successful implementation of mentoring program. this analysis on medical students' need should be considered.

Identification of Estrogenic and Antiestrogenic Activities ofRespirable Diesel Exhaust Particles by Bioassay-directed Fractionation

오승민,Byung Taek Ryu,정규혁 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.1

Bioassay-directed fractionation was performed to identify causative chemical groups of DEPs with estrogenic and antiestrogenic activities. Bioassay-directed fractionation consists of a cell bioassay (E-SCREEN) in conjunction with acid-base partitioning (F1 and F2) and silica gel column fractionation of neutral fractions (F3-F7). Crude extract (CE) of DEPs in dichloromethane (DCM) exhibited both estrogenic and antiestrogenic activity. Estrogenic activity of CE and some fractions (F1, F2, F3, F5 and F6) was induced through estrogen receptor (ER)-mediated pathways. In particular, the acid polar fraction (F2) of DEPs, which contains phenols, induced high levels of estrogenic activity compared to other fractions. The estrogenic activity of F2 (610.80 pg-bio-EEQ/g-DEPs) was higher than that of the total estrogenic activity of CE (222.22 pg-bio-EEQ/g-DEPs). This result indicates that the estrogenic activity induced by causative estrogenic fraction (F2) may be antagonized by unidentified chemicals in DEPs. On the other hand, non-polar fractions (F3 and F4) of DEPs include aliphatic and chlorinated hydrocarbon, polyaromatic hydrocarbons, and their alkyl derivatives, which play an important role in the antiestrogenic activity of DEPs. In particular, F4, which contains PAH and its derivatives, showed the highest antiestrogenic activity. Since in our previous study, dibenzo(a, h)anthracene and chrysene were identified in F4, and these chemicals have antiestrogenic activity, we assume that these chemicals are the major causative chemicals with antiestrogenic activity in DEPs. In contrast to the estrogenic activity of DEPs, antiestrogenic activity of CE was stronger than that of antiestrogenic fractions (F3 and F4) at non-cytotoxic concentrations, indicating that additive or synergistic effects by unidentified chemicals contained in DEPs occurred

Antiestrogenic Potentials of ortho-PCB Congeners by Single or Complex Exposure

오승민,Byung Taek Ryu,Sang Ki Lee,정규혁 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.2

Di-ortho PCB congeners 52, 138, 153 and 180, and the mono-ortho coplanar congener 118 have been detected as a complex mixture in human tissue in Korea. This study examined the antiestrogenic effects of samples exposed to single or combination treatment of the ortho-PCB congeners. In order to determined the combined toxicity, a sample mixture (M1, M2, M3, M4, and M5) was designed based on the ortho-PCB congeners found in Korean human tissue. With the exception of PCB 52, the ortho-PCB congeners (PCB 118, 138, 153, and 180) showed weak antiestrogenic activity. The antiestrogenic activity of di-ortho PCB congeners (PCB 138, 153, and 180) was induced by the depletion of endogenous E2 as well as through the ER-dependent pathway, whereas the antiestrogenic activity of mono-ortho PCB 118 was only induced through the depletion of endogenous E2. When the MCF7-BUS cells were treated with mixtures containing the no effective concentration (10-6 M) of the PCB congeners, M3 (PCB 118 + PCB 138 + PCB 180) and M4 (PCB 118 + PCB 138) had an antiestrogenic effect but the other mixtures (M1; PCB 52 + PCB 118 + PCB 138 + PCB 180, M2; PCB 118 + PCB 138 + PCB 153 + PCB 180, M5; PCB 118 + PCB 180) did not. Although the mechanism for the interaction between the PCB congeners is not completely understood, it was presumed that exposure to a mixture of the PCB congeners might have synergistic effects on their antiestrogenicity through the ER-independent pathway.

Effects of Ginkgo Biloba on In Vitro Osteoblast Cells and Ovariectomized Rat Osteoclast Cells

오승민,김하룡,정규혁 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.2

Ginkgo biloba extract (GBE) has a selective estrogen receptor modulator (SERM)-like biphasic effect on estrogen, and could be a potential alternative to hormone replacement therapy (HRT). Here, we investigated whether GBE can ameliorate estrogen-depleted osteoporosis in in vitro osteoblast cells and in estrogen-deprived ovariectomized (OVX) rats, a classical animal model for postmenopausal osteoporosis. GBE (50-150 μg/mL) significantly increased ALP (Alkaline phosphatase) activity of osteoblast cells, indicating that GBE promotes osteoblast mineralization. OVX rats exposed to GBE (100 and 200 mg/kg/day, oral treatment), raloxifene (3 mg/kg/day, oral treatment) or estradiol (E2, 10 μg/kg/day, subcutaneous injection) decreased osteoclast resorptive activity compared with OVX rats. GBE and raloxifene did not increase uterine weight compared with OVX rats, while E2 and Sham control did, suggesting that GBE has no uterotrophic activity, which is a disadvantage of estrogen therapy. In OVX rats, GBE did not restore severe bone density loss induced by OVX, indicating that GBE may be insufficient as therapeutic material for severe osteoporosis. However, despite its no effects on bone density loss in OVX rats, GBE did stimulate osteoblast differentiation and antiosteoclastic activity in vitro. Therefore, GBE may have preventive potential on osteoporosis as do other phytoestrogens.

세포배양 생화학적 기법에 의한 수환경오염 평가 ( Cell Culture Microbioassay for the Water Pollution Monitoring )

오승민,정규혁 한국독성학회 2000 Toxicological Research Vol.16 No.4