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- 저자 : Tiejun Hu (검색결과 3 건)
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Modeling and Multivariable Control of a Novel Multi-Dimensional Levitated Stage with High Precision
Tiejun Hu,Won-jong Kim 대한전기학회 2006 International Journal of Control, Automation, and Vol.4 No.1
This paper presents the modeling and multivariable feedback control of a novel high-precision multi-dimensional positioning stage. This integrated 6-degree-of-freedom (DOF) motion stage is levitated by three aerostatic bearings and actuated by 3 three-phase synchronous permanent-magnet planar motors (SPMPMs). It can generate all 6-DOF motions with only a single moving part. With the DQ decomposition theory, this positioning stage is modeled as a multi-input multi-output (MIMO) electromechanical system with six inputs (currents) and six outputs (displacements). To achieve high-precision positioning capability, discrete-time integrator-augmented linear-quadratic-regulator (LQR) and reduced-order linear-quadratic-Gaussian (LQG) control methodologies are applied. Digital multivariable controllers are designed and implemented on the positioning system, and experimental results are also presented in this paper to demonstrate the stage's dynamic performance.
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Hu Jiaqi,Qiao Zhaopeng,Fan Lunhe,Tang Yongqiang,Cao Liangzhi,Zu Tiejun,He Qingming,Li Zhifeng,Wang Sheng 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4
MgF2 as a moderator material has been extensively used in the beam shaping assembly (BSA) that plays an important role in the boron neutron capture therapy (BNCT). Regarded as important for applications, the thermal neutron scattering data of MgF2 were calculated, based on the phonon expansion model. The structural properties of MgF2 were researched by the VASP code based on the ab-initio methods. The PHONOPY code was employed to calculate the phonon density of states. Furthermore, the NJOY code was used to calculate the thermal neutron scattering data of MgF2. The calculated inelastic cross sections plus absorption cross sections are in agreement with the available experimental data. The neutron transport in the BSA has been simulated by using a hybrid Monte-Carlo-Deterministic code NECP-MCX. The results indicated that compared with the calculation of the free gas model, the thermal neutron flux and epithermal neutron flux at the BSA exit port calculated by using the thermal neutron scattering data of MgF2 were reduced by 27.7% and 8.2%, respectively.
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Isolation and characterisation of collagen from elk antler velvet
Lee, Do Hun,Hong, Heeok,Lodhi, Gaurav,Cheong, Sun Hee,Park, Pyo Jam,Hu, Tiejun,Sangwoo, Kim,Moon, Sang Ho,Jeon, Byong Tae CSIRO Publishing 2014 Animal Production Science Vol.54 No.8
<P> Collagen was extracted from the antler velvet of elk (Cervus elaphus). Two types of collagen were prepared namely, acetic acid-soluble collagen and pepsin-soluble collagen. The electrophoretic patterns of both of the collagens showed that they were heterotrimeric, i.e. they consisted of α1α2α3. The total yield of the collagen obtained from the elk antler velvet was 12.1%. Amino acid analysis of the collagen by high-performance liquid chromatography showed that imino acid content such as that of proline and hydroxyproline was high, which might contribute to better visco-elastic properties. The peptide mapping of the collagens showed their similarity with porcine Type I collagen, thereby suggesting that the primary structure of both collagens is identical to that of porcine skin Type I collagen. The thermal denaturation temperature was 37°C, which is comparable to porcine Type I collagen and may also be as a result of high imino acid content. </P>
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