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Development of Integrated Chassis Control Algorithms to Improve Vehicle Dynamics
Taehun Hwang(황태훈),Kihong Park(박기홍),Seung-Jin Heo(허승진),Ji Yoel Joeng(정지열),Sangho Lee(이상호),Unkoo Lee(이언구),Kyu Hoon Lee(이규훈),Seung Guan Kee(기승관),Kangwon Lee(이강원) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most electronic chassis control systems so far have been designed for optimization of its own performance. This, sometimes, has resulted in performance degradation when two or more control modules were operating together. Recently. great R&D effort is being given to judicious integration of individual chassis control systems in an effort to further enhance the overall vehicle performance. In this paper, two integrated control logics - one that integrates the brake and suspension control systems and the other that integrates the brake and steering control systems - have been developed. The main control target of both logics is vehicle dynamics control under critical situations. The two logics were tested under various driving conditions in a reliable simulation environment and their synergetic effects were investigated. The results indicate that the proposed logics can yield better vehicle performance than the cases when the individual chassis control modules work without any integration scheme.
CarSim과 퍼지제어기를 이용한 차량 동력학 제어기 설계
황태훈(Taehun Hwang),박기홍(Kihong Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The research of the vehicle stability is actively processing together car electronics in recent years. A commonly used active safety systems are ABS(Antilock Brake System) and TCS(Traction Control System). The VDC(Vehicle Dynamics Control, also known as ESP) system is safety system that can control effectively the lateral direction of vehicle unlike these. When the vehicle is unstable(oversteer or understeer status) during the cornering, it is safety system that can maintain the vehicle stability applying the braking or driving force. This research proposes a co-simulation method. In order to develop the co-simulation environment, the full vehicle model of CarSim and control logic consisting of MATLAB/Simulink are used. Proposed Fuzzy controller calculates an adequate brake torque and Vehicle dynamics controller determines one wheel depending on vehicle status for control. The verification of this VDC system is performed under various simulation conditions like J-turn, lane change, sinusoidal steering test.
황태훈(Taehun Hwang),이형명(Hyungmyung Lee),유은영(Eunyoung You),정태영(Taeyoung Chung),신광근(Kwangkeun Joseph Shin) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Various types of intelligent tire sensors, which measures tire forces directly, are developed by tire manufacturers and their consortiums for chassis control system application. If a tire sensor can offers forces between tire contact patch and road surface, chassis control systems can be improved with respect to vehicle dynamics aspects. In conventional chassis system, most of vehicle dynamics related variables and parameters are estimated by using chassis sensors, like wheel speed, yaw rate, lateral acceleration and etc. In this paper, we studied a feasibility of wheel force measurements based chassis control logic by using real-time tire force measurements.
황태훈(Taehun Hwang),정태영(Taeyoung Chung),이규훈(Kyu Hoon Lee),유은영(Eun Young You),여태정(Tae-Jung Yeo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Due to the vehicle electronic and development of communication technologies, Besides the basic functions supporting the weight to the vehicle and mitigating the road impact, Tire is adding the additional function such as the TPMS(Tire Pressure Monitoring System). In addition, recently research of the intelligent tire system capable of measuring the tire force have been actively. Yet only the leading technology in the development stage, however, launching of the prototype is expected in the near future according to leading companies and excellent domestic and international research institutions . In this paper, Vehicle dynamic controller is designed using tire force information that occurred between the tire and road surface. The proposed controller is verified using CarSim simulation.
황태훈(Taehun Hwang),이시형(Sihyoung Lee),박기홍(Kihong Park) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
본 논문에서는 각 바퀴의 독립구동이 가능한 4륜 독립구동 차량의 스키드조향 알고리즘과 슬립제어기에 대해 언급하고자 한다. 스키드조향이란 좌우 바퀴의 구동력 차이를 이용하여 전륜의 조향 없이도 차량의 선회가 가능하도록 하는 조향 방식을 말한다. 이를 위해 2자유도 기준차량모델로부터 목표 요레이트를 계산하고 실제 요레이트 값의 차이를 비교, 보정하여 차량 선회가 가능하도록 하는 새로운 스키드조향 알고리즘을 제안한다. 또한 직진 가속 및 제동시에 발생할 수 있는 과도한 슬립을 방지하여 주행안정성을 확보하고자 하는 슬립제어기를 제안하였다. 제안된 로직 검증을 위해 차량 동력학 해석프로그램(CarSim)과 MATLAB/Simulink 기반으로 구현된 제어로직을 연동하여 스키드조향 알고리즘과 슬립제어기의 타당성을 분석하였다.
실시간 시뮬레이션 환경 기반 AFS 제어기 설계 및 검증
황태훈(Taehun Hwang),윤경준(Kyoungjun Yoon),강민철(Minchul Kang),오나미(Nami Oh),전대석(Daeseok Jeon),박기홍(Kihong Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents construction of realtime simulation circumstances for designing chassis control system controller. One of various chassis control systems, The AFS(Active Front Steering) system is an active chassis control system that can improve driving stability by controlling yaw motion of vehicle with yaw rate sensor signal. The suggested controller was materialized by special ECU using RCP equipment. As realtime circumstances for controller design, CarSim-RT and RT-LAB were used to construct realtime simulation circumstances. CarSim vehicle model has 27 DOF, and it can reproduce relatively accurate vehicle driving. Besides, realtime-based controller verification ensured reliance. Experiments under the various driving environment were conducted to verify the suggested simulation circumstances and controller.
Taehun An,Iickho Song,Seungwon Lee,Hwang-Ki Min IEEE 2014 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.13 No.12
<P>We address detection schemes of spectrum sensing for cognitive radio with multiple receive antennas operating over a wideband channel composed of a multitude of subbands. By taking the observations in all subbands into consideration in the likelihood functions for sensing a subband, the test statistics of the proposed schemes are functions of the sample covariance matrix in the subband under consideration and that in the subband exhibiting the lowest power spectral density. The false alarm and detection probabilities of the proposed schemes are analyzed theoretically and confirmed via simulations when the numbers of observations are the same for all the subbands. It is shown through computer simulations that the proposed schemes can provide considerable performance gains over conventional schemes for wideband spectrum sensing when the observations are spatially correlated and temporally independent/dependent.</P>
Growth Pattern and Prognostic Factors of Untreated Nonfunctioning Pituitary Adenomas
Hwang, Kihwan,Kwon, Taehun,Park, Jay,Joo, Jin-Deok,Han, Jung Ho,Oh, Chang Wan,Kim, Chae-Yong The Korean Neurosurgical Society 2019 Journal of Korean neurosurgical society Vol.62 No.2
Objective : Pituitary adenomas (PAs) are often detected as incidental findings. However, the natural history remains unclear. The objective of this study was to evaluate the natural history and growth pattern of untreated PAs. Methods : Between 2003 and 2014, 59 PAs were managed with clinico-radiological follow up for longer than 12 months without any kind of therapeutic intervention. Tumor volumes were calculated at initial and last follow-up visit, and tumor growth during the observation period was determined. Data were analyzed according to clinical and imaging characteristics. Results : The mean initial and last tumor volume and diameter were $1.83{\pm}2.97mL$ and $13.77{\pm}6.45mm$, $2.85{\pm}4.47mL$ and $15.75{\pm}8.08mm$, respectively. The mean annual tumor growth rate was $0.33{\pm}0.68mL/year$ during a mean observation period of $46.8{\pm}32.1months$. Sixteen (27%) PAs showed tumor growth. The initial tumor size (HR, 1.140; 95% confidence interval, 1.003-1.295; p=0.045) was the independent predictive factor that determined the tumor growth. Six patients (11%) of 56 conservatively managed non-symptomatic PAs underwent resection for aggravating visual symptoms with mean interval of 34.5 months from diagnosis. By Cox regression analysis, PAs of last longest diameter over 21.75 mm were a significant prognostic factor for eventual treatment. Conclusion : The initial tumor size of PAs was independently associated with the tumor growth. Six patients (11%) of conservatively managed PAs were likely to be treated eventually. PAs of last follow-up longest diameter over 21.75 mm were a significant prognostic factor for treatment. Further studies with a large series are required to determine treatment strategy.