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Model-Based Load Characteristics Analysis of the Multi-Dimensional Force Sensor
Liyue Fu,Aiguo Song 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
As an important component of force feedback device, multi-dimensional force sensor has been widely used in haptic device, prosthetic hand and other devices. In a given application, the multi-dimensional force sensor is always coupled with a load by the screw thread, which may result in a totally different dynamic behavior from a bare force sensor. It is the key data for deeply understanding the dynamic performance to have information about the structural distribution of stiffness and mass of the multi-dimensional force sensor. To address this need, the approach of model-based load characteristic analysis of the multi-dimensional force sensor is presented in this paper. Dynamic behavior of the force sensor in a given load is described by a lumped mass model consists of spring-mass-damper elements and characterized by the model parameters that describe the dynamic correlation distribution of mass, stiffness, and damping. The main purpose of the proposed approach is the description of the load characteristics of the multi-dimensional force sensor, independent of the given mechanical environment, which provides a certain theoretical reference for the calculation of the load capacity of the force sensor.
OPTIMAL CONTROL FOR SHIFTING COMMAND OF TWO-SPEED ELECTRIC VEHICLES CONSIDERING SHIFTING LOSS
Yang Liyue,박도현,Lyu Shaowen,Zheng Chunhua,김남욱 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.4
The energy efficiency of battery electric vehicles (BEVs) remains to be improved, and a two-speed transmission can be regarded as a prominent technology for BEVs because the two-speed transmission can improve acceleration and powertrain efficiency. However, the transmission device requires a well-designed control strategy because the performance of the vehicle can deteriorate if the controller selects an inefficient gear step. Herein, a gear shifting control concept based on dynamic programming is proposed to maximize the system efficiency, where the shifting loss caused by shifting actuators is considered in the control problem. The performance of the proposed control concept is compared to that of a controller utilizing a shifting map obtained via quasi-static optimization. It is shown that the proposed concept improves the efficiency by 0.01 ~ 0.4 % compared with the shifting map applied to different hysteresis gaps, and around 13 % shifting frequency reduction has been experienced while the best energy hysteresis gap is selected. In addition to improving efficiency, the control concept can be extremely beneficial to engineers who wish to design the best control strategy without calibrating the control parameters when the actuator loss is considered in the control problem.
곽주영,Liyue Zhang,Hyunjoo Min 한국외국어대학교 국제지역연구센터 2011 International Area Studies Review Vol.14 No.2
Although the sales of the motion-picture industry in China have grown incomparably to any other country during the past decade, most research related to it has focused on discourse of the political or social contexts. Using the resource-based view, our study empirically examines the determinants that encourage the audience to pay for a movie at China’s box offices. The resource-based view posits that a firm or product’s competitiveness arises from valuable resources that appeal to consumers. In line with this, we have hypothesized that box-office performance is affected by marketing-related resources and by a certain set of the strategic variables embedded in individual films. We have constructed our dataset based on the foreign films imported to and released in China from 2007 to 2009, and have conducted a regression analysis. The statistical results have suggested that actor reputation, China-related contents, and Chinese crew participation in the movie production, and release timing are significantly related to the box-office performance of foreign firms in China. We have presented an interpretation of our statistical results, linking to the characteristics of the current Chinese audience as a consumer for foreign films.
Yan Gao,Ding Yuan,Liyue Gai,Xuelian Wu,Yue Shi,Yumin He,Chaoqi Liu,Changcheng Zhang,Gang Zhou,Chengfu Yuan 고려인삼학회 2021 Journal of Ginseng Research Vol.45 No.3
Background: The decreased renal function is known to be associated with biological aging, of which the main pathological features are chronic inflammation and renal interstitial fibrosis. In previous studies, we reported that total saponins from Panax japonicus (SPJs) can availably protect acute myocardial ischemia. We proposed that SPJs might have similar protective effects for aging-associated renal interstitial fibrosis. Thus, in the present study, we evaluated the overall effect of SPJs on renal fibrosis. Methods: Sprague-Dawley (SD) aging rats were given SPJs by gavage beginning from 18 months old, at 10 ㎎/㎏/d and 60 ㎎/㎏/d, up to 24 months old. After the experiment, changes in morphology, function and fibrosis of their kidneys were detected. The levels of serum uric acid (UA), β2-microglobulin (β2-MG) and cystatin C (Cys C) were assayed with ELISA kits. The levels of extracellular matrix (ECM), matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), inflammatory factors and changes of oxidative stress parameters were examined. Results: After SPJs treatment, SD rats showed significantly histopathological changes in kidneys accompanied by decreased renal fibrosis and increased renal function; As compared with those in 3-month group, the levels of serum UA, Cys C and β2-MG in 24-month group were significantly increased (p < 0.05). Compared with those in the 24-month group, the levels of serum UA, Cys C and β2-MG in the SPJ-H group were significantly decreased. While ECM was reduced and the levels of MMP-2 and MMP-9 were increased, the levels of TIMP-1, TIMP-2 and transforming growth factor-β1 (TGF-β1)/Smad signaling were decreased; the expression level of phosphorylated nuclear factor kappa-B (NF-κB) was down-regulated with reduced inflammatory factors; meanwhile, the expression of nuclear factor erythroid 2-related factor 2-antioxidant response element (Nrf2-ARE) signaling was aggrandized. Conclusion: These results suggest that SPJs treatment can improve age-associated renal fibrosis by inhibiting TGF-β1/Smad, NFκB signaling pathways and activating Nrf2-ARE signaling pathways and that SPJs can be a potentially valuable anti-renal fibrosis drug.