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Jun Hong,Baotong Li,Yubao Chen,Huei Peng 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.10
The engine cylinder head is one of the most critical components in an automotive powertrain system. Yet, it has the most complicated mechanical structure coupled with a sophisticated combustion process. This study attempts to develop a concrete and practical procedure for the optimal design of the engine cylinder head. First, a simplified topological model composed of beam, shell and membrane elements is developed to simulate the real cylinder head. With this model, the finite element method can be easily and economically employed to study the load-bearing mechanism of the cylinder head under actual engine operation conditions. After characterizing the stress/strain behavior of all the key components through parametric analysis, a new optimization criterion is developed based on Lagrange conditions. This criterion provides an opportunity to represent the ideal ‘balanced point’ among the main design parameters of the cylinder head in terms of weight distribution of the key components. Finally, the optimization of the cylinder head structure is implemented successfully based on these findings. Compared to the optimization results from commercial software, the proposed approach is able to produce a much better solution in respect to both the convergence speed and the final value of the objective function.
김주희(Juhui Gim),안창선(Changsun Ahn),Huei Peng 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Precise vehicle localization in urban canyons is difficult due to the GPS signal blocking caused by buildings. An observer can guess the current position by observing relative positions to the landmarks of which global positions are known. A vehicle can accurately observe its surroundings using a LiDAR. This paper proposes a landmark-based local positioning system using LiDAR as an alternative to GPS. First, the positioning system detects pole-like landmarks from the LiDAR point clouds using prior knowledge of pole-like objects. Then, the global positions of the detected landmarks are identified using information consisting of the geometric characteristics of the landmark itself and distances from other landmarks. Finally, vehicle position is reconstructed using the weighted average based on the number of LiDAR points observed landmarks. The proposed algorithm is validated in Mcity to show the potential of the landmark-based localization as an alternative to GPS/RTK, about a 3 cm-level accuracy.
Chi-Huang Chang,Chung-Yin Chen,Jueen-Ya Chiou,Robert Y. Peng,Chiung-Huei Peng 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.3
Astaxanthine (ASTx) is a novel carotenoid nutraceutical occurring in many crustaceans and red yeasts. It has potent antioxidant, photoprotective, hepatodetoxicant, and anti-inflammatory activities. Documented effect of ASTx on treatment of neurodegenerative disease is still lacking. We used the β-amyloid peptide (Aβ) 25–35-treated PC12 model to investigate the neuron-protective effect of ASTx. The parameters examined included cell viability, caspase activation, and various apoptotic biomarkers that play their critical roles in the transduction pathways independently or synergistically. Results indicated that Aβ25–35 at 30μM suppressed cell viability by 55%, whereas ASTx was totally nontoxic below a dose of 5.00μM. ASTx at 0.1μM protected PC12 cells from damaging effects of Aβ25–35 in several ways: (1) by securing the cell viability; (2) by partially down-regulating the activation of caspase 3; (3) by inhibiting the expression of Bax; (4) by completely eliminating the elevation of interleukin-1β and tumor necrosis factor-α; (5) by inhibiting the nuclear translocation of nuclear factor κB; (6) by completely suppressing the phosphorylation of p38 mitogen-activated protein kinase; (7) by completely abolishing the calcium ion influx to effectively maintain calcium homeostasis; and (8) by suppressing the majority (about 75%) of reactive oxygen species production. Conclusively, ASTx may have merit to be used as a very potential neuron protectant and an anti–early-stage Alzheimer's disease adjuvant therapy.
Chien-Ning Huang,Chi-Li Lin,Hsin-Hua Li,Sing-Hua Tsou,Chiung-Huei Peng 한국식품영양과학회 2023 Journal of medicinal food Vol.26 No.7
Abelmoschus esculentus (Okra) Prevents Insulin Resistance and RestoresNeuron Autophagy by Regulating Dipeptidyl Peptidase-4and Thus Improving Hippocampal Function
The simple and easy way to manufacture counter electrode for dye-sensitized solar cells
Jo-Lin Lan,Yung-Yun Wang,Chi-Chao Wan,Tzu-Chien Wei,Hsien-Ping Feng,Chao Peng,Hai-Peng Cheng,Ya-Huei Chang,Wen-Chi Hsu 한국물리학회 2010 Current Applied Physics Vol.10 No.2
We previously developed poly-N-vinyl-2-pyrrolidone (PVP)-capped Pt nanoclusters on ITO glass via a simple ‘‘2-step dip coating process” as counter electrode for DSSC. This new counter electrode was examined by transmission electron microscopy (TEM), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and current–voltage curve (I–V curve). The TEM results revealed that PVP-capped Pt nanoclusters’ size is about 3 nm, and the amount of Pt deposited on ITO glass is about 5 ㎍/㎠. Comparing with sputtered Pt and Solaronix thermal cluster Pt-catalyst T/SP, the PVP-capped Pt counter electrode has lower amount of Pt deposited on TCO glass,more positive potential of tri-iodide reduction, and better performance for the charge-transfer resistance (RCT) and the cell efficiency (g).