http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Development Vehicle Localization Fail Safe for Reliability Improvement of Lv3 Autonomous Driving
Kyungil Seo,Jaehoon Lee,Jaeyoung Lee,Ilki Moon 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
In this paper, vehicle localization fail safe algorithm is proposed for improving localization accuracy and for securing reliability for level 3 autonomous driving. This logic is not necessary an additional and expensive sensors configuration using sensor fusion with practical usage and high density map. And the proposed algorithm suggests three-step safety mechanism. The first step is to detect and to monitor about in-vehicle sensors. The second step is a DR(Dead Reckoning) fail monitoring model-based fail monitoring. The last process is a map-matching fail safe to detect and recover abnormal position of map-matching result. The fail detection and monitoring algorithm was validated by real vehicle level over a hundred thousand kilometer driving. The performance of DR fail monitoring logic was evaluated by vehicle-simulation with real sensor measurements. It is also verified that the proposed logic shows its reliability of detection and recovery to the abnormal case by the simulation.
Multi-CPU를 이용한 통합샤시 제어로직 구현 및 성능검증
서경일(Kyungil Seo),조완기(Wanki Cho),허현동(Hyundong Heo),이경수(Kyongsu Yi) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper describes the design and evaluation procedure of a Unified Chassis Control (UCC) Algorithm for implementation on a Field Programmable Gate Array (FPGA) assisting multi-core processes. The UCC algorithm consists of three parts ? the Supervisor, the Main Controller and the Fault Detection, and Isolation (FDI)/ Fault Tolerance Control (FTC). The architecture supports a distributed control with analytical and physical redundancy capabilities. The Supervisor comprises estimation, monitoring and decision logic components based on a Rollover Index (RI). The Main Controller is made up of Rollover Mitigation Control (RMC), Active Front Steering (AFS) control and Electronic Stability Control (ESC) elements. The FDI/FTC is composed of subsystems for handling sensor and brake actuator faults. The aims of the multi-core ECU platforms proposed by this paper are to reduce the operating load and to maximize reliability in order to maintain improvements of the vehicle’s dynamics performance. A Vehicle Simulator and Brake Hardware-In-the-Loop Simulator (HILS) are used to evaluate the proposed algorithm. The test results show that the UCC algorithm improves the performance of lateral stability, and that is able to recover from sensor and actuator fault conditions. In addition to these, the multi-core processor structure enhances reliability, and reduces the execution time.
Kyungil Park,Jong-Sung Park,Young-Rak Cho,Tae Ho Park,Moo-Hyun Kim,Tae-Hyun Yang,Doo-IL Kim,Jung-Hwan Kim,Yong-Hwan Lee,Dong-Won Lee,Jeongkee Seo,Geun-Young Lee,Young-Dae Kim 대한심장학회 2020 Korean Circulation Journal Vol.50 No.8
Background and Objectives: In acute ST-segment elevation myocardial infarction (STEMI), on-site transmission of electrocardiogram (ECG) has been shown to reduce systemic time delay to reperfusion and improve outcomes. However, it has not been adopted in community-based emergency transport system in Korea. Methods: Busan Regional Cardio-cerebrovascular Center and Busan Metropolitan City Fire and Safety Headquarters (BMFSH) jointly developed and conducted a pre-hospital ECG transmission program. Seven tertiary hospitals and 22 safety stations of BMFSH participated. Systemic time delay to reperfusion of STEMI patients in the program was compared with that of 95 patients transported by 119 emergency medical system (EMS) before the program was implemented. Results: During the study period, 289 ECG transmissions were made by 119 EMS personnel, executed within 5 minutes in 88.1% of cases. Of these, 42 ECGs were interpreted as ST-segment elevation. Final diagnosis of STEMI was made in 20 patients who underwent primary percutaneous coronary intervention. With the program, systemic time delay to reperfusion was significantly reduced (median [interquartile range; IQR], 76.0 [62.2–98.7] vs. 90.0 [75.0–112.0], p<0.01). Significant reduction of door-to-balloon time was also observed (median [IQR], 45.0 [34.0–69.5] vs. 58.0 [51.0–68.0], p=0.03). The proportion of patients with systemic time delay shorter than 90 minutes rose (51.6% vs. 75.0%, p=0.08) with pre-hospital ECG transmission. Conclusions: We developed and implemented a community-based pre-hospital ECG transmission program for expeditious triage of STEMI patients. Significant reductions of systemic time delay and door-to-balloon time were observed. The expanded use of pre-hospital ECG transmission should be encouraged to realize the full potential of this program.
금속/폴리머 샌드위치 복합재의 기계적 특성 및 범퍼 응용 연구
공경일(Kyungil Kong),박형욱(Hyung Wook Park),경규형(Gyouhyoung Kyung),이규세(Gyuse Lee),서종덕(Seo Jong Duk) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.10-2
Recently, the reduction of the vehicle weight is the critical factor to enhancing the fuel efficiency of the passenger cars. Therefore, the lightweight materials have been adopted to the automotive components. However, although the vehicle weight reduces, the overall stiffness should be equal to the steel based automotive components due to the safety of drivers and passengers. One of the good candidates for the lightweight materials satisfy both requirements is the metal/poylmer sandwich. In this study, the static stiffness of this metal/polymer sandwich was experimentally observed with comparison with various steels. Its ratio of impact energy absorption has also been investigated and compared with that of the steels. In addition, the finite element analysis of the front bumper based on the metal/polymer composite has been performed to identify variation of its static stiffness
Soft-Lithographic Fabrication of Ni Nanodots Using Self-Assembled Surface Micelles
Young-Soo Seo,Jungsoo Lee,Kyungil Lee,Taewan Kim 한국자기학회 2008 Journal of Magnetics Vol.13 No.2
This study proposes a simple nano-patterning process for the fabrication of magnetic nanodot arrays on a large area substrate. Ni nanodots were fabricated on a large area (4 inches in diameter) Si substrate using the soft lithographic technique using self-assembled surface micelles of Polystyrene-block-Poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer formed at the air/water interface as a mask. The hexagonal array of micelles was successfully transferred to a Ni thin film on a Si substrate using the Langmuir-Blodgett technique. After ion-mill dry etching, a magnetic Ni nanodot array with a regular hexagon array structure was obtained. The Ni nanodot array showed in-plane easy axis magnetization and typical soft magnetic properties.
함준호(JunHo Ham),문일기(IlKi Moon),서경일(KyungIl Seo),차종조(ChongJo Cha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The fusion sensing methodology of longitudinal velocity and acceleration sensors is proposed in this work. Additionally an accelerometer has gravity and initial bias, which is detrimental to control performance. The proposed estimator also can reduce effects of these biases. Many estimators, which use longitudinal velocity and acceleration sensors, was developed and used. The proposed estimator shows better performance than others. Because of more tight fusion method is applied. This paper will be shown that the proposed fusion filtering has better performance than others with simulation and vehicle test.