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임재혁(Jaehyuk Lim),성현수(HyounSoo Sung),임세영(Seyoung Im) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A dynamic finite element analysis of a rig test model for truck chassis systems is conducted to establish an appropriate model designed to predict the fatigue life. A reference Belgian road input, which has been obtained from a field test, is imposed on the finite element model in the modal finite element analysis, and the resulting strain history is employed for the prediction of the fatigue life. This is compared with the prediction based upon the strain history measured in the field test. The two agree with each other within the limitation of the field data and the input data to the model. The high frequency responses over 50 ㎐ are confirmed to be negligible as far as their effect on the fatigue life is concerned.
고유황 경유가 자동차 배출가스 및 입자개수에 미치는 영향 연구
임재혁(Jaehyuk Lim),이민호(Minho Lee),김종렬(Jongryeol Kim) 한국자동차공학회 2022 한국자동차공학회 지부 학술대회 논문집 Vol.2022 No.5
As oil prices rise, cases of using marine diesel by mixing it with automobile diesel or directly using marine diesel are increasing in some coastal areas. Unlike vehicle diesel, marine diesel contains a significant amount of sulfur, which poisons the catalyst of the reduction device installed to reduce emission, increasing emission and causing malfunction. In this study, the effect of high sulfur diesel on the emission and particle number of old diesel vehicles and the latest regulated vehicles was studied. Compared to general diesel, NMHC emission gas concentration increased by 248.3%, CO 195.2%, NOx 33.0%, and PM 33.2% in old diesel vehicles to which high sulfur diesel was applied. In the case of emissions of the latest regulated vehicles, the level of gaseous emission increase was lower than that of old diesel vehicles, but in the case of PM and PN, they increased significantly by 335.5% and 511.4%, respectively. As such, it was confirmed that sulfur oxides(SOx) generated during combustion in the engine poisoned the catalyst in the reduction device and deteriorated the performance, thereby increasing the emission. In addition, when high sulfur diesel is used for a long period of time, it is judged that it will cause failure of expensive emission reduction devices such as DOC, DPF, and SCR, which will greatly affect parts damage and driver safety threats.
고정 신호원의 위치 추정을 위한 직접 위치 결정 기법의 정확도 향상 방법
임재혁(Jaehyuk Lim),이승진(Seungjin Lee),송종인(Jong-In Song),정원주(Wonzoo Chung),이재훈(Jaehoon Lee) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.11
본 논문에서는 신호원의 수신 신호 정보를 이용하여 직접 신호원 위치를 추정하는 DPD(Direct Position Determination) 기법을 기반으로 향상된 고정신호원 위치 추정 기법을 제안한다. 기존의 DPD 기법을 이용하여 위치 추정을 할 때, 기준 수신기와 다중 이동 수신기 쌍의 선택 방법에 따라 위치 추정 정확도 및 추정오차의 경향이 다르게 나타난다. 이러한 사실을 바탕으로, 각 수신기 쌍에서의 공분산행렬을 이용하여 신호원 위치 추정의 가중치를 얻었으며, DPD 기법에 적용 하였다. 마지막으로 제안된 DPD 기법을 이용하여 신호원 위치를 추정하였으며, 기존 DPD 기법과 비교하여 추정 정확도가 향상됨을 확인하였다. In this paper, an improved method of estimating static source location is proposed based on the direct position determination(DPD) method, which estimates a source position directly using received signals. When the source position is estimated using the conventional DPD method, the estimation accuracy and error depend on a pair of receivers: a reference receiver and one of the multiple moving receivers. Based on this, the weighting values of the estimating source location were obtained using the covariance matrix for the pair of receivers(S1, S2i) and applied to the DPD algorithm. Finally, the source position was estimated using the proposed DPD algorithm, and it was verified that the estimation accuracy improved, compared to the conventional DPD algorithm.