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Graphene oxide MgFe2O4 nanocomposites for Cr(VI) remediation: a comparative modeling study

Nanotechnology for Environmental Engineering 2018年第1期3卷 1-11页

作者： Hosseini, Seyed Ali Talebipour, Sahar Neyestani, Mahmoud reza ranjan, Shivendu dasgupta, Nandita Department of Applied Chemistry Faculty of Chemistry Urmia University Urmia Iran Department of Chemistry Faculty of Science Zanjan University Zanjan Iran R&D and Technology Development E-Spin Nanotech Pvt Ltd SIDBI Incubation Center IIT Kanpur KanpurUttar Pradesh208016 India Nano-food Research Group School of Bio Sciences and Technology VIT University VelloreTamil Nadu India

The article describes the synthesis and application of magnesium ferrite nanoparticles (MgFe2O4 NPs) and engineered MgFe2O4 nanocomposites (NCs) by graphene oxide as green and easy separable magnetic adsorbents in removal of Cr(VI) from environmental pollutant. The statistical study of the adsorption process and optimization was accomplished with central composite design method of response surface methodology (rSM) approach. The optimum conditions, predicted by rSM, were achieved at pH, contact time, initial Cr(VI) concentration and adsorbent dosage of 2, 60 min, 40 mg L−1 and 0.15 g, respectively. The removal of Cr(VI) under optimum situations was 97%, and the achieved result in practice was found to be 99%. Pareto analysis suggests the importance relative order of the factors as: pH > concentration of Cr(VI) > time > adsorbent dosage under optimized situations. The engineered nanocomposite was further analyzed for real groundwater samples, and 92% Cr(VI) remediation was resulted. The study is the first study for efficient Cr(VI) remediation from real groundwater sample using novel engineered nanocomposites and has potential to have societal as well as industrial impact in the form of process or product development. © 2018, Springer International Publishing AG, part of Springer Nature.

关键词： Nanocomposites

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An aptamer-based shear horizontal surface acoustic wave biosensor with a CVd-grown single- layered graphene film for high-sensitivity detection of a label-free endotoxin

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Microsystems & Nanoengineering 2020年第1期6卷 1247-1257页

作者： Junwang Ji Yiquan Pang dongxiao Li Zheng Huang Zuwei Zhang Ning Xue Yi Xu Xiaojing Mu Key Laboratory of Optoelectronic Technology&Systems Ministry of EducationInternational R&D Center of Micro-nano Systems and New Materials TechnologyChongqing University400044 ChongqingChina School of Chemistry and Chemical Engineering Chongqing University400030 ChongqingChina Department of Applied Physics Chongqing University401331 ChongqingChina Chongqing Acoustic-Optic-Electric Corporation China Electronic Technology Group Corporation400060 ChongqingChina Institute of Electronics Chinese Academy of Sciences100190 BeijingChina

The thickness of the sensitive layer has an important influence on the sensitivity of a shear horizontal surface acoustic wave(SH-SAW)biosensor with a delay-line structure and lower layer numbers of graphene produce better sensitivity for biological ***,a label-free and highly sensitive SH-SAW biosensor with chemical vapor deposition(CVd-)-grown single-layered graphene(SLG)for endotoxin detection was developed in this *** this methodology,SH-SAW biosensors were fabricated on a 36°Y-90°X quartz substrate with a base frequency of 246.2MHz,and an effective detection cell was fabricated using acrylic *** increase the surface hydrophilicity,chitosan was applied to the surface of the SLG ***,the aptamer was immobilized on the surface of the SLG film by cross-linking with ***,the sensitivity was verified by endotoxin detection with a linear detection ranging from 0 to 100 ng/mL,and the detection limit(LOd)was as low as 3.53 ng/*** addition,the stability of this type of SH-SAW biosensor from the air phase to the liquid phase proved to be excellent and the specificity was tested and verified by detecting the endotoxin obtained from Escherichia coli(***),the endotoxin obtained from Pseudomonas aeruginosa(***),and ***,this type of SH-SAW biosensor with a CVd-grown SLG film may offer a promising approach to endotoxin detection,and it may have great potential in clinical applications.

关键词： film surface layered

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Self-Supervised Button recognition for Indoor Mobile robots

Self-Supervised Button Recognition for Indoor Mobile Robots

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International Symposium on Soft Computing and Intelligent Systems (SCIS)

作者： Jeong-Won Pyo Kwang-Hee Lee Jung-San Cho Tae-Yong Kuc Electrical and Computer Engineering SungKyunKwan University Suwon Korea Robot R&D Group Korea Institute of Industrial Technology Ansan korea

In recent years, with the rapid advances in technology, the precision and accuracy of indoor autonomous driving have also improved remarkably. However, despite the development of these technologies, there are still many difficulties to perform services through real mobile robots. In this paper, we focused on the mobile robot that drives in multiple spaces in a multi-story building using an elevator. In order to operate the elevator, the mobile robot must be able to operate by pressing the elevator button itself. To solve this problem, in this paper, we propose self-supervised button recognition. We created fake buttons for self-supervised learning and placed these on random backgrounds to increase the diversity of the dataset. In addition, the generated realistic buttons are re-generated like real buttons through a GAN. In experiments, we presented that our self-supervised button recognition was performed in an actual environment without separate labeling.

关键词： Training Self-supervised learning Pressing Generative adversarial networks Elevators Mobile robots Labeling

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reinforcement Learning Based Position Control of 1-dOF rotational Hydraulic Actuator

Reinforcement Learning Based Position Control of 1-DOF Rotat...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Hokwon Kang Jin Tak Kim Sangsin Park Jungsan Cho Department of Robotics Engineering University of Science and Technology(UST) Daejeon Korea The Hydraulic Robot Laboratory Robot R&D Group Korea Institute of Industrial Technology(KITECH) Ansan South Korea

ISBN: (数字)9788993215380

ISBN: (纸本)9798331517939

In this study, we propose a reinforcement learning (rL) based position control method for a one-degree-of-freedom (1-dOF) rotational hydraulic actuator. Controlling hydraulic actuators is challenging due to their nonlinear characteristics and complex structure. reinforcement learning offers the advantage of enabling control through learning without requiring a detailed understanding of the model, using virtual environments. However, simulators do not perfectly replicate real-world conditions. To address this, we aim to enhance the fidelity of the simulation and improve the performance of reinforcement learning-based controllers by integrating real-world data into the simulation using deep neural networks (dNN). The reinforcement learning is trained using the Proximal Policy Optimization (PPO) algorithm, and it is validated through experiments with step and sine inputs.

关键词： Legged locomotion refining Hydraulic actuators Position control Virtual environments reinforcement learning Artificial neural networks Hydraulic systems Control systems Optimization

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Object removal and Inpainting from Image using Combined GANs

Object Removal and Inpainting from Image using Combined GANs

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Jeongwon Pyo Yuri Goncalves rocha Arpan Ghosh Kwanghee Lee Gungyo In Taeyoung Kuc College of Information and Communication Engineering Sungkyunkwan University Suwon Korea Robot R&D Group Korea Institute of Industrial Technology Ansan Korea

ISBN: (数字)9788993215205

ISBN: (纸本)9781728185620

As recent research on deep learning methods has been actively conducted, a number of deep learning methods have been proposed. In this paper, we propose a method of removing the desired object from an image using generative adversarial networks(GANs) structure. We composed the network in which two GANs are fused. The first GAN erases the target object from the input image, and the second GAN generates an image that fills the empty space with the background. Through this network, we can erase the desired object from the input image and get an image with the erased part filled with the background without any object detection method. We show that the removal of people and vehicles from images of roads using the CityScapes dataset.

关键词： Generators Generative adversarial networks Training Image segmentation deep learning Annotations Semantics

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Workspace Analysis of Cable-driven Continuum Manipulator Using Universal Joint

Workspace Analysis of Cable-Driven Continuum Manipulator Usi...

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International Conference on Ubiquitous robots (Ur)

作者： Myung-oh Kim dongwoon Choi duck-Yeon Lee dong-Wook Lee Department of Mechanical Engineering Hanynag University Seoul Korea Applied Robot R&D Department Korea Institute of Industrial Technology (KITECH) Ansan Korea

This paper presents a comprehensive study on the workspace of a continuum manipulator using a universal joint. The research focuses on analyzing the effect of different parameters such as joint angles and flexible link lengths on the workspace of the manipulator. A mathematical model is developed to determine the workspace and validate the results through simulations. The study also includes a discussion on the limitations and challenges of using a universal joint in continuum manipulators and ways to overcome them. The findings of this research contribute to the understanding of the workspace of continuum manipulators and can be used to design more effective and efficient manipulator systems.

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Analysis of android robot lip-sync factors affecting communication 16

Analysis of android robot lip-sync factors affecting communi...

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ACM/IEEE International Conference on Human-robot Interaction (HrI)

作者： Hyun-Jun Hyung Byeong-Kyu Ahn Brian Cruz dong-Wook Lee Robot R&D Group Korea Institute of Industrial Technology Ansan South Korea Robotics and Virtual Engineering Korea University of Science & Technology Ansan South Korea

ISBN: (纸本)9781467383707

In this paper, we analyze lip-sync factors affecting communication of android robots. We have generated eight mouth shapes for single vowels based on the Hangul vowel triangle chart. We assume that the mouth shape and lip-sync timing are important factors for communication with android robots. An experiment was conducted in a noisy environment during an exhibition. A total of 120 people were surveyed about how well they understood and why. Unlike the hypothesis, sound is found to be an important factor that affects human understanding. Because experimental results can be affected by noise and whether subjects have seen a robot or not, we will plan to conduct further experiments in a quiet environment after explaining android robots to subjects sufficiently.

关键词： Mouth Shape Humanoid robots Smart phones Androids Timing

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Analytic Plane Covariances Construction for Precise Planarity-based Extrinsic Calibration of Camera and LidAr

Analytic Plane Covariances Construction for Precise Planarit...

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IEEE International Conference on robotics and Automation (ICrA)

作者： Gunhee Koo Jaehyeon Kang Bumchul Jang Nakju doh School of Electrical Engineering Korea University Seoul Republic of Korea Robot R&D Group Korea Institute of Industrial Technology Ansan Republic of Korea

ISBN: (数字)9781728173955

ISBN: (纸本)9781728173962

Planarity of checkerboards is a widely used feature for extrinsic calibration of camera and LidAr. In this study, we propose two analytically derived covariances of (i) plane parameters and (ii) plane measurement, for precise extrinsic calibration of camera and LidAr. These covariances allow the graded approach in planar feature correspondences by exploiting the uncertainty of a set of given features in calibration. To construct plane parameter covariance, we employ the error model of 3d corner points and the analytically formulated plane parameter errors. Next, plane measurement covariance is directly derived from planar regions of point clouds using the out-of-plane errors. In simulation validation, our method is compared to an existing uncertainty-excluding method using the different number of target poses and the different levels of noise. In field experiment, we validated the applicability of the proposed analytic plane covariances for precise calibration using the basic planarity-based method and the latest planarity-and-linearity-based method.

关键词： Three-dimensional displays Calibration Cameras Laser radar Linear programming Solid modeling Two dimensional displays

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An experimental evaluation for the precision assembly of rotational sensor according to the changes of fit tolerance

An experimental evaluation for the precision assembly of rot...

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International Conference on Ubiquitous robots and Ambient Intelligence (UrAI)

作者： Jaeyoul Lee Ingyu Park Kwangwoo Jeon Sanghun Lee Applied Technology division Korea Institute of Robot and Convergence Pohang Korea R&D Center/DE Drive Technology RS Automation Co. Ltd. Pyoeongtaek Korea

In this study explored how to conduct experimental evaluation according to fit tolerance of bearing housing applied for the precise assembly Jig developed to fabricate high precision rotational sensor, and to develop ... 详细信息

关键词： robot sensing systems Assembly Assembly systems rotation measurement displacement measurement Industries

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development of precision assembly JIG for rotational sensor having 21bit class resolution

Development of precision assembly JIG for rotational sensor ...

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International Conference on Ubiquitous robots and Ambient Intelligence (UrAI)

作者： Jaeyoul Lee Ingyu Park Yongchul Park Sanghun Lee Applied Technology division Korea Institute of Robot and Convergence Pohang Korea R&D Center/DE Drive Technology RS Automation Co. Ltd. Pyoeongtaek Korea

rotational sensor mounted on a motor to precisely control robot system is designed to obtain the rotation value and speed information in term of rotor. Precise rotational sensor is one of the critical components to constitute a precisely controlled robot system. In current, most of precise rotational sensor has not been developed with domestic technology but resorts to import from foreign countries. What is the most important in developing high precision sensor is to develop precision assembly JIG. This paper describes the order and how to assemble rotational sensor and possible problems in the course of assembly, as well as the development of assembly JIG for 21 bit precise rotational sensor.

关键词： Assembly robot sensing systems Integrated circuits Clamps Thumb

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