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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.

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        Comparative Metabolite Profiling and Hormone Analysis of Perennial and Annual Rice

        Xiuqin Zhao,Ting Zhang,Liyu Huang,Huimin Wu,Fengyi Hu,Fan Zhang,Linghua Zhu,Binying Fu 한국식물학회 2012 Journal of Plant Biology Vol.55 No.1

        Perenniality is one of the important topics in rice breeding which is generally accompanied by complex physiobiochemical processes. To understand the metabolic characteristics of perennial rice, in the present study, gas chromatography–mass spectrometry and enzyme-linked immunosorbent assays were used to profile the distribution patterns of 33 primary metabolites and hormones [indole-3-acetic acid (IAA) and zeatin riboside (ZR)] of annual (RD23) and perennial (Oryza longistaminata and the line AA with RD23 genetic background) rice genotypes. Results showed that both metabolites and hormones have distinct genotype and organ distribution patterns, and considerable variations were observed between the metabolites in stem bases of perennial and annual rice. Most of the metabolites,including sugars, organic acids, and amino acids, significantly accumulated in the stem bases of perennial rice by decreasing the level in roots and leaves. Fifteen metabolites consistently accumulated significantly in the stem bases of both perennial genotypes. Additionally, the organ-level IAA content and IAA/ZR ratio in the two perennials were considerably higher than those in RD23. The present study indicated that the significant accumulation of the metabolites at stem base and the higher IAA/ZR ratio are involved

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