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  • 1
    Online Resource
    Online Resource
    IOP Publishing ; 2013
    In:  Japanese Journal of Applied Physics Vol. 52, No. 5R ( 2013-05-01), p. 055202-
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 52, No. 5R ( 2013-05-01), p. 055202-
    Abstract: The solution-refined method is developed to solve electrostatic fields of the electron-beam direct-write lithography system. The prediction of accurate electron trajectories and the geometry of the developed photoresist patterns rely on high-resolution electrostatic fields in the whole system. Considering fabrication errors, such electrostatic fields cannot be solved using a cylindrical symmetry. Thus, this problem is a multiscale problem that requires a huge computer memory to solve. In our cases, the minimum number of grids of 1 nm length are applied and the total memory required approaches 75 Gbyte. Since the proposed solution-refined technique has a tradeoff with computational time, fewer central processing units (CPUs) are needed to solve this system because each CPU that solves the problem exceeds its available storage memory. The proposed technique can be used to solve the electron-beam direct-write lithography system at higher resolution and the problems exceed the available storage memory.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    RVK:
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    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 2
    In: Precision Engineering, Elsevier BV, Vol. 68 ( 2021-03), p. 106-123
    Type of Medium: Online Resource
    ISSN: 0141-6359
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2000665-2
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  • 3
    Online Resource
    Online Resource
    SAGE Publications ; 2019
    In:  International Journal of Advanced Robotic Systems Vol. 16, No. 1 ( 2019-01-01), p. 172988141982810-
    In: International Journal of Advanced Robotic Systems, SAGE Publications, Vol. 16, No. 1 ( 2019-01-01), p. 172988141982810-
    Abstract: Human object detection, tracking, and recognition have applications in many areas, such as in the development of assistance robots and intelligent monitoring systems. The emergence of an RGB-D camera, namely the Kinect v2, has simplified the process of human object detection and tracking. Color space methods are dependent on lighting conditions. Because skeleton-tracking algorithms are based on depth images, they are light invariant relative to color space methods. However, skeleton information may sometimes be incorrect or become lost. An algorithm for human-target recognition is thus required. Therefore, this study proposes a human-target tracking and recognition system combining RGB images, depth images, body index, and skeleton information. The system first extracts the color information of five body parts (two upper arms, the torso, and two thighs) using color, depth, and skeleton information. The system then analyzes the color information using a mixed nine-dimensional histogram and single-color analysis method. The algorithm also includes overlap detection during the process of human-target tracking to prevent misidentification caused by occlusion. To test the proposed system, various scenarios were carefully designed to simulate the extremely complex environmental changes characteristic of the real world. Furthermore, the dynamic statistical method of event statistics was used to collect results. Experiments revealed that the proposed method is robust under varying lighting conditions and increases the success rate for individuals wearing similar clothing with monochrome colors.
    Type of Medium: Online Resource
    ISSN: 1729-8814 , 1729-8814
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 2202393-8
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  • 4
    Online Resource
    Online Resource
    Elsevier BV ; 2011
    In:  Renewable and Sustainable Energy Reviews Vol. 15, No. 6 ( 2011-8), p. 3029-3033
    In: Renewable and Sustainable Energy Reviews, Elsevier BV, Vol. 15, No. 6 ( 2011-8), p. 3029-3033
    Type of Medium: Online Resource
    ISSN: 1364-0321
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2011
    detail.hit.zdb_id: 2019940-5
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  • 5
    In: Machines, MDPI AG, Vol. 9, No. 10 ( 2021-09-22), p. 205-
    Abstract: This paper develops a decoupled multi-loop control for a two-wheeled inverted pendulum (TWIP) robot that can assist user’s with walking. The TWIP robot is equipped with two wheels driven by electrical motors. We derive the system’s transfer function and design a robust loop-shaping controller to balance the system. The simulation and experimental results show that the TWIP system can be balanced but might experience velocity drifts because its balancing point is affected by model variations and disturbances. Therefore, we propose a multi-loop control layout consisting of a velocity loop and a position loop for the TWIP robot. The velocity loop can adjust the balancing point in real-time and regulate the forward velocity, while the position loop can achieve position tracking. For walking assistance, we design a decoupled control structure that transfers the linear and rotational motions of the robot to the commands of two parallel motors. We implement the designed controllers for simulation and experiments and show that the TWIP system employing the proposed decoupled multi-loop control can provide satisfactory responses when assisting with walking.
    Type of Medium: Online Resource
    ISSN: 2075-1702
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2704328-9
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  • 6
    Online Resource
    Online Resource
    ASME International ; 2018
    In:  Journal of Dynamic Systems, Measurement, and Control Vol. 140, No. 7 ( 2018-07-01)
    In: Journal of Dynamic Systems, Measurement, and Control, ASME International, Vol. 140, No. 7 ( 2018-07-01)
    Abstract: One very effective approach to suppress hysteresis from the piezoelectric actuator is to use the charge control across the associated capacitance. The charge driver often uses an additional capacitor connected to the piezo-actuator in series for the charge sense feedback control. When this charge sense is used with a voltage drive for the charge control, the applied voltage will include two parts. The one is the voltage drop across the useful electro-mechanical part and effectively converted to the driving force, whereas the other part indicates the equivalent voltage drop due to the hysteresis. In our research, we noticed that it is possible to use a simple estimator as the hysteresis voltage observer and use it to precompensate for the voltage drop. Comparing to the conventional hysteresis suppression achieved by the closed-loop positional control, we show significant improvement of the control performance. For dynamic applications, we also proposed a combination of the Preisach model with the hysteresis estimator to better suppress the nonlinear behavior. A series of experiments were conducted to demonstrate the performance improvement of the proposed compensator. A 10 nm and 25 nm maximum tracking error can be maintained while tracking a staircase reference and a 30 Hz sinusoidal signal, respectively.
    Type of Medium: Online Resource
    ISSN: 0022-0434 , 1528-9028
    Language: English
    Publisher: ASME International
    Publication Date: 2018
    detail.hit.zdb_id: 240760-7
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  • 7
    Online Resource
    Online Resource
    Institute of Electrical and Electronics Engineers (IEEE) ; 1999
    In:  IEEE Transactions on Automatic Control Vol. 44, No. 9 ( 1999-Sept.), p. 1742-1745
    In: IEEE Transactions on Automatic Control, Institute of Electrical and Electronics Engineers (IEEE), Vol. 44, No. 9 ( 1999-Sept.), p. 1742-1745
    Type of Medium: Online Resource
    ISSN: 0018-9286
    RVK:
    Language: Unknown
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 1999
    detail.hit.zdb_id: 241443-0
    detail.hit.zdb_id: 2033330-4
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  • 8
    Online Resource
    Online Resource
    Elsevier BV ; 2008
    In:  IFAC Proceedings Volumes Vol. 41, No. 2 ( 2008), p. 15624-15629
    In: IFAC Proceedings Volumes, Elsevier BV, Vol. 41, No. 2 ( 2008), p. 15624-15629
    Type of Medium: Online Resource
    ISSN: 1474-6670
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2008
    detail.hit.zdb_id: 2976778-7
    detail.hit.zdb_id: 2839185-8
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  • 9
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 1998
    In:  Journal of Mechanics Vol. 14, No. 1 ( 1998-03), p. 49-55
    In: Journal of Mechanics, Oxford University Press (OUP), Vol. 14, No. 1 ( 1998-03), p. 49-55
    Abstract: We propose a new path following control algorithm. The algorithm decomposes the trajectory errors into tangential and normal components. The normal component minimizes the tracking error, while the tangential component maintains the desired speed. Experimental results using an X-Y table indicate that the proposed method possesses satisfactory tracking characteristics. It resolves certain previously difficult to control problems.
    Type of Medium: Online Resource
    ISSN: 1727-7191 , 1811-8216
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1998
    detail.hit.zdb_id: 2219777-1
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  • 10
    Online Resource
    Online Resource
    MDPI AG ; 2022
    In:  Processes Vol. 10, No. 3 ( 2022-03-20), p. 605-
    In: Processes, MDPI AG, Vol. 10, No. 3 ( 2022-03-20), p. 605-
    Abstract: A strain gradient was created by punching a hole in the center of a stretched elastic polydimethylsiloxane membrane to determine the effect of different strains on cultured human keratocytes (HK). In this study, two stretching methods were used: continuous stretching and cyclic stretching. Continuous stretching is relatively static, while acyclic stretching is relatively dynamic. These methods, respectively, represented the effects of high intraocular pressure and rubbing of the eyes on corneal cells. Image processing codes were developed to observe the effects of stress concentration, shear stress, continuous stretching, and cyclic stretching on HKs. The results demonstrate that stretching and shear stress are not conducive to the proliferation of corneal cells and instead cause cell death. A 10% strain had greater inhibitory effects than a 3% strain on cell proliferation. Cell survival rates for continuous stretching (static) were higher than those for cyclic stretching (dynamic). The stretching experiment revealed that cyclic stretching has a greater inhibitory effect on the growth and proliferation of corneal cells than continuous stretching. Accordingly, it shows that cyclic loading is more harmful than high intraocular pressure (static loading) to corneal cells.
    Type of Medium: Online Resource
    ISSN: 2227-9717
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2720994-5
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