Dayou Li

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Papers by Dayou Li

Study of morphological and mechanical features of multinuclear and mononuclear SW480 cells by atomic force microscopy

Microscopy Research and Technique, Oct 9, 2017

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Study of morphological and mechanical features of multinuclear and mononuclear SW480 cells by atomic force microscopy

Zenodo (CERN European Organization for Nuclear Research), Apr 17, 2019

This article studies the morphological and mechanical features of multinuclear and mononuclear SW... more This article studies the morphological and mechanical features of multinuclear and mononuclear SW480 colon cancer cells by atomic force microscopy to understand their drug-resistance. The SW480 cells were incubated with the fullerenol concentrations of 1 mg/ml and 2 mg/ml. Morphological and mechanical features including the height, length, width, roughness, adhesion force and Young's modulus of three multinuclear cell groups and three mononuclear cell groups were imaged and analyzed. It was observed that the features of multinuclear cancer cells and mononuclear cancer cells were significantly different after the treatment with fullerenol. The experiment results indicated that the mononuclear SW480 cells were more sensitive to fullerenol than the multinuclear SW480 cells, and the multinuclear SW480 cells exhibited a stronger drug-resistance than the mononuclear SW480 cells. This work provides a guideline for the treatments of multinuclear and mononuclear cancer cells with drugs.

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Fuzzy logic based intention recognition in STS processes

2016 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), 2016

This paper represents a fuzzy logic based classifier that is able to recognise human users' inten... more This paper represents a fuzzy logic based classifier that is able to recognise human users' intention of standing up from their behaviours in terms of the force they apply to the ground. The research reported focused on the selection of meaningful input data to the classifier and on the determination of fuzzy sets that best represent the intention information hidden in the force data. The classifier is a component of a robot chair which provide the users with assistance to stand up based on the recognised intention by the classifier. I.

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Sit-to-Stand Intention Recognition

Sit-to-stand (STS) difficulties are common among elderly because of the decline of their cognitiv... more Sit-to-stand (STS) difficulties are common among elderly because of the decline of their cognitive capabilities and motor functions. The way to help is to encourage them to practice their own functions and to assist only at the point where they need during STS processes. The provision of such support requires the elderly’s intention of standing up to be recognised and the amount of support as well as the moment when the support would be needed to be predicted. The research presented in this paper focuses on intention recognition as it is difficult due to uncertainties existing in STS processes and differences in individual’s biomechanical features. This paper presents fuzzy logic based self-adaptive approach to the recognition of standing up intention from sensor signals that contain the uncertainties.

Study of morphological and mechanical features of multinuclear and mononuclear SW480 cells by atomic force microscopy

Microscopy research and technique, Jan 9, 2017

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Antireflection silicon structures with hydrophobic property fabricated by three-beam laser interference

Applied Surface Science, 2015

Highlights • A three-beam laser interference system was set up to generate periodic structures. •... more Highlights • A three-beam laser interference system was set up to generate periodic structures. • Silicon surfaces were directly modified by nanosecond laser interference. • The hexagonally-distributed hole structures can have considerably low reflectance. • The resulting structures have a large contact angle and self-cleaning capability. • The modulation phenomenon is not evident in three-beam laser interference.

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Compensation of the magnetic force imaging by scanning directions

Micron, 2017

It was found that the results of magnetic force microscope (MFM) imaging were different with the ... more It was found that the results of magnetic force microscope (MFM) imaging were different with the probe scanning directions, and the images were often distorted. This paper studied the effect of scanning directions on the MFM imaging, and a method for the distortion compensation was proposed to reduce the errors. In the study, three different scanning directions with the angles of 0°, 45° and 90°, were used to measure the magnetic force distribution of a magnetic sample with a regular structure. The theoretical and experimental results have shown that the scanning direction parallel to the magnetic structure will cause a minimum phase shift difference and lead to a structure distortion. With the proposed compensation method, the distortion structures were corrected and the effect of scanning directions on the MFM imaging was significantly reduced. This work provides a way to obtain the correct images of magnetic structures using an MFM and to improve the imaging quality in a wide range of MFM applications.

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Effects of laser fluence on silicon modification by four-beam laser interference

Journal of Applied Physics, 2015

This paper discusses the effects of laser fluence on silicon modification by four-beam laser inte... more This paper discusses the effects of laser fluence on silicon modification by four-beam laser interference. In this work, four-beam laser interference was used to pattern single crystal silicon wafers for the fabrication of surface structures, and the number of laser pulses was applied to the process in air. By controlling the parameters of laser irradiation, different shapes of silicon structures were fabricated. The results were obtained with the single laser fluence of 354 mJ/cm 2 , 495 mJ/cm 2 , and 637 mJ/cm 2 , the pulse repetition rate of 10 Hz, the laser exposure pulses of 30, 100, and 300, the laser wavelength of 1064 nm, and the pulse duration of 7-9 ns. The effects of the heat transfer and the radiation of laser interference plasma on silicon wafer surfaces were investigated. The equations of heat flow and radiation effects of laser plasma of interfering patterns in a four-beam laser interference distribution were proposed to describe their impacts on silicon wafer surfaces. The experimental results have shown that the laser fluence has to be properly selected for the fabrication of well-defined surface structures in a four-beam laser interference process. Laser interference patterns can directly fabricate different shape structures for their corresponding applications.

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Identifying Mubasher software products through sentiment analysis of Arabic tweets

2016 International Conference on Industrial Informatics and Computer Systems (CIICS), 2016

Social media has recently become a rich resource in mining user sentiments. In this paper, Twitte... more Social media has recently become a rich resource in mining user sentiments. In this paper, Twitter has been chosen as a platform for opinion mining in trading strategy with Mubasher products, which is a leading stock analysis software provider in the Gulf region. This experiment proposes a model for sentiment analysis of Saudi Arabic (standard and Arabian Gulf dialect) tweets to extract feedback from Mubasher products. A hybrid of natural language processing and machine learning approaches on building models are used to classify tweets according to their sentiment polarity into one of the classes positive, negative and neutral. Firstly, document's Pre-processing are explored on the dataset. Secondly, Naive Bayes and Support Vector Machines (SVMs) are applied with different feature selection schemes like TF-IDF (Term Frequency-Inverse Document Frequency) and BTO (Binary-Term Occurrence). Thirdly, the proposed model for sentiment analysis is expanded to obtain the results for N-Grams term of tokens. Finally, human has labelled the data and this may involve some mistakes in the labelling process. At this moment, neutral class with generalisation of our classification will take results to different classification accuracy.

Automated ontology framework for service robots

2015 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2015

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The Development of a Semi-Autonomous Framework for Personal Assistant Robots - SRS Project

International Journal of Intelligent Mechatronics and Robotics, 2013

SRS is a European research project for building robust personal assistant robots using ROS (Robot... more SRS is a European research project for building robust personal assistant robots using ROS (Robotic Operating System) and Care-O-bot (COB) 3 as the demonstration platform. A semi-autonomous framework has been developed in the project. It consists of an autonomous control structure and user interfaces that support the semi-autonomous operation. The control structure is divided into two parts. First, it has an automatic task planner, which initialises actions on the symbolic level. The planner produces proactive robotic behaviours based on updated semantic knowledge. Second, it has an action executive for coordination actions at the level of sensing and actuation. The executive produces reactive behaviours in well-defined domains. The two parts are integrated by fuzzy logic based symbolic grounding. As a whole, they represent the framework for autonomous control. Based on the framework, SRS user interfaces are integrated on top of COB's existing capabilities to enable robust fetch...

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An Evolutionary-Based Approach to Learning Multiple Decision Models from Underrepresented Data

2008 Fourth International Conference on Natural Computation, 2008

The use of multiple Decision Models (DMs) enables to enhance the accuracy in decisions and at the... more The use of multiple Decision Models (DMs) enables to enhance the accuracy in decisions and at the same time allows users to evaluate the confidence in decision making. In this paper we explore the ability of multiple DMs to learn from a small amount of verified data. This becomes important when data samples are difficult to collect and verify. We propose an evolutionary-based approach to solving this problem. The proposed technique is examined on a few clinical problems presented by a small amount of data.

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A survey on assistive chair and related integrated sensing techniques

2013 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 2013

ABSTRACT This paper presents a survey of the current approaches of sit-to-stand assistive chairs.... more ABSTRACT This paper presents a survey of the current approaches of sit-to-stand assistive chairs. Sitting in a chair and standing up from a seated position are common activities performed by humans on a daily basis. However, older people often encounter difficulties with these activities. The difficulties may cause substantial decreasing of the elderly mobility, leading to inactive participation in society and increasing the risk of chronic diseases that may cause premature death. Therefore, assisting older people to overcome these difficulties has significance for their independent living and active ageing. The assistive devices can be allocated in terms of market available ones and experimental prototypes. Both classes of these devices are discussed in this survey. We also discuss sensing techniques that are currently used with experimental prototypes in addition to those that could be used and build a high level taxonomy of sensing techniques. Following from this survey, a chair capable of delivering assistance-as-needed is proposed.

Direct laser interference technology and potential applications

2014 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), 2014

ABSTRACT Development of direct laser interference technology (DLIT) is reviewed in this paper. Wi... more ABSTRACT Development of direct laser interference technology (DLIT) is reviewed in this paper. With the merits of being independent on the pretreatment, mask and pattern transfer processes, DLIT is demonstrated a facile and efficient method of producing sub-micro structures on various material surfaces. From a representative perspective, a number of past achievements, containing theoretical and practice aspects, attained by the nanosecond, picosecond, and femtosecond laser interference techniques are introduced. Advantages and limitations in comparison to one another are also addressed. With the progress of the emerging subwavelength structures (e.g. metasurfaces, plasmonic structures) offering the fascinating possibility of controlling the behaviour of light in an unprecedented way, the perspectives of potential applications benefited from DLIT are finally given. Keywords — Direct laser interference technology, Nanosecond, picosecond and femtosecond interference.

Integration of Symbolic Task Planning into Operations within an Unstructured Environment

International Journal of Intelligent Mechatronics and Robotics, 2012

To ensure a robot capable of robust task execution in unstructured environments, task planners ne... more To ensure a robot capable of robust task execution in unstructured environments, task planners need to have a high-level understanding of the nature of the world, reasoning for deliberate actions, and reacting to environment changes. Proposed is a practical task planning approach that seamlessly integrating deeper domain knowledge, real time perception and symbolic planning for robot operation. A higher degree of autonomy under unstructured environment will be endowed to the robot with the proposed approach.

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Error factors affecting the result of Laser Interference Lithography

2013 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 2013

ABSTRACT Laser Interference Lithography (LIL) techniques enable quantitative generation of period... more ABSTRACT Laser Interference Lithography (LIL) techniques enable quantitative generation of periodic structures such as array of holes, dots and lines, which are the intrinsic structure in some optical functional material. In this paper, the most common errors factors that could affect the result of laser interference lithography were presented. The methods to enhance the quality of patterns of LIL also have been introduced.

Oblique fringe measurement by pattern correlation

The 2010 IEEE International Conference on Information and Automation, 2010

ABSTRACT This paper introduces a method for the determination of the slope and period of oblique ... more ABSTRACT This paper introduces a method for the determination of the slope and period of oblique and equi-spaced fringes by pattern correlation. In the method, two pairs of image patches in two different regions of a fringe pattern are selected for pattern correlation calculations, and the phase shift between the two selected regions of the fringe pattern is obtained from the phase curves computed with the correlation function. The computer simulation and experiment have shown that this method is useful in interferometry and laser interference lithography for determining the slope and period of the oblique and equi-spaced fringe patterns with the advantage of high resistance to noise. It has potential applications for the measurement of the fringe pattern period, fringe angle, phase difference, displacement, and other relevant physical quantities. In practice, it can also be used for the orientation of interference patterns and alignment of laser interference lithography systems.

Phase-shift control in two-beam laser interference lithography

2011 IEEE International Conference on Mechatronics and Automation, 2011

ABSTRACT This paper presents a method of phase-shift control in two-beam laser interference litho... more ABSTRACT This paper presents a method of phase-shift control in two-beam laser interference lithography. In the method, a PZT actuator is used to push a mirror and introduce phase shifts in a He-Ne laser interference lithography simulation system. When different voltages are applied to the PZT actuator, fringe positions are changed accordingly, and the phase shifts are introduced. The phase shifts can be determined by fringe pattern correlation with subpixel accuracy. This method is useful in two- beam laser interference lithography for the control of phase shifts and fringe positions in interference patterns for multi- exposure patterning applications.

Integrated Sensing Techniques for Assistive Chairs

International Journal of Intelligent Mechatronics and Robotics, 2013

This paper presents a survey of the contemporary assistive chairs and on-chair sensing approaches... more This paper presents a survey of the contemporary assistive chairs and on-chair sensing approaches of capturing sit-to-stand (STS) movement. Sitting in a chair and standing up from a seated position are activities of daily living (ADLs) performed by humans. However, older people often encounter difficulties with these activities. These difficulties may cause substantial decreasing of the elderly mobility, leading to inactive participation in social activities and increasing the risk of chronic diseases that may cause premature death. Therefore, assisting older people to overcome these difficulties has significance for their independent living. At present, the assistive devices can be allocated in terms of market available ones and experimental prototypes, both of which are discussed here. Afterwards, the authors cast more light on integrated sensing techniques that are currently used with experimental prototypes and create a taxonomy of sensing techniques. Following from this survey,...

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Multi-dimensional fuzzy interpolation neural network

2009 IEEE International Conference on Automation and Logistics, 2009

ABSTRACT This paper presents a multi-dimensional fuzzy interpolation neural network (FINN) which ... more ABSTRACT This paper presents a multi-dimensional fuzzy interpolation neural network (FINN) which extends fuzzy interpolation that was developed to approximate single input single output functions to multi-dimensional space. The multidimensional fuzzy interpolation piecewise approximates multiple-input-single-output functions with small hyper-surfaces defined over fuzzy regions. The vertices of these fuzzy regions are represented by weighted multivariate fuzzy sets which are defined over the input space of a function. Optimally arranging the fuzzy sets in the input space can achieve arbitrary accurate approximations. The proposed FINN is able to establish the optimisation of the fuzzy sets. It was used to approximate the energy distribution of light for light chip and optical fibre alignment.

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