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5th International Conference on Learning Representations, ICLR 2017

作者： Kim, Jin-Hwa On, Kyoung-Woon Lim, Woosang Kim, Jeonghee Ha, Jung-Woo Zhang, Byoung-Tak Interdisciplinary Program in Cognitive Science Seoul National University Seoul08826 Korea Republic of School of Computer Science and Engineering Seoul National University Seoul08826 Korea Republic of School of Computing KAIST Daejeon34141 Korea Republic of NAVER LABS Corp. NAVER Corp Gyeonggi-do13561 Korea Republic of School of Computer Science and Engineering Interdisciplinary Program in Cognitive Science Seoul National University and Surromind Robotics Seoul08826 Korea Republic of

Bilinear models provide rich representations compared with linear models. They have been applied in various visual tasks, such as object recognition, segmentation, and visual question-answering, to get state-of-the-art performances taking advantage of the expanded representations. However, bilinear representations tend to be high-dimensional, limiting the applicability to computationally complex tasks. We propose low-rank bilinear pooling using Hadamard product for an efficient attention mechanism of multimodal learning. We show that our model outperforms compact bilinear pooling in visual question-answering tasks with the state-of-the-art results on the VQA dataset, having a better parsimonious property. © ICLR 2019 - Conference Track Proceedings. All rights reserved.

关键词： Object recognition

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A study for estimating reaction force of robot arm by using PDSPO

A study for estimating reaction force of robot arm by using ...

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International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

作者： Hyun Hee Kim Sun Oh Park Jin Ho Kyung Hyun Min Do Min Cheol Lee Interdisciplinary Program in Robotics Pusan National University Busan Korea School of Mechanical Engineering Pusan National University Busan Korea Department of Robotics and Mechatronics Korea Institute of Machinery and Materials Daejeon Korea

In the industrial field, assembling parts using robot arm requires force information. Some robot arms with torque sensors are commercially available, but they are difficult to use for industrial applications due to durability problems. In addition, mounting a torque sensor on the robot arm increases manufacturing costs and complicates the structure. In this study, we apply Sliding Perturbation Observer (SPO) to 7-axis robot manipulator and estimate reaction force without using torque sensor in simulation. From the estimated perturbation, it can be determined whether the end effector of the robot manipulator will crash part of the assembly.

关键词： Manipulators Service robots Robot sensing systems Collision avoidance Observers Force

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A study on robust control method of underwater vehicle using SMCSPO

A study on robust control method of underwater vehicle using...

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Asian Control Conference

作者： Hyun Hee Kim Jong Seob Won Hyeon Jin Cho Jun Ho Hwang Min Cheol Lee Interdisciplinary Program in Robotics Pusan National University Geumjeong-gu Busan Korea Department of Mechanical and Automotive Engineering Jeonju University Wansan-gu Jeonju-si Jeollabuk-do Korea Agency for Defense Development Korea School of Mechanical Engineering Pusan National University Geumjeong-gu Busan Korea

ISBN: (纸本)9781509015740;9781509015733

The application of robust control method is required for the design of the automatic control system of the unmanned underwater vehicle which is operated in underwater environment under great disturbance. Sliding Perturbation Observer (SPO) was developed to overcome the chattering phenomenon which is a weak point of the sliding mode control. This control method can be applied to the control of underwater vehicle operating in strong environmental disturbances because it has the advantage of estimating and compensating for nonlinear components, modeling uncertainties and environmental disturbances of the system. In this study, the sliding mode control with sliding perturbation observer (SMCSPO) is simulated in an underwater vehicle to evaluate the disturbance compensation performance and compare it with a PID controller.

关键词： Underwater vehicles Perturbation methods Vehicle dynamics Observers Mathematical model Sliding mode control PI control

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SMCSPO based reaction force estimation for 7 DOF robot arm

SMCSPO based reaction force estimation for 7 DOF robot arm

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Hyun Hee Kim Wang Jie Karam Dad Kallu Min Cheol Lee Interdisciplinary Program in Robotics Pusan National University Busan Korea School of Mechanical Engineering Pusan National University Busan Korea

ISBN: (纸本)9781467390583

The high degree-of-freedom robot arms need the end-effector's assembly force information for precision and accuracy works. But attaching a force sensor on the end-effector of robot is difficult because of cost, weight and structural problems. In this paper, we will apply SMCSPO(Sliding Mode Control with Sliding Perturbation Observer) robust control algorithm to a 7 degree-of-freedom robot arm to estimate assembly force without force sensor in robotics Lab simulation. From estimated perturbation, we can decide whether the end-effector of robot arm crashes the assembly part of not. If the absolute value of perturbation of most axes is sharply increasing case, it can be assumed that the end-effector of robot manipulator and assembling parts collide into each other.

关键词： Manipulators Robot sensing systems Force Service robots Collision avoidance Observers

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The development of flying touch hot rolling control method based on SMCSPO

The development of flying touch hot rolling control method b...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Hyun-Hee Kim Sung-Jin Kim Min Cheol Lee Interdisciplinary Program in Robotics Pusan National University Busan Republic of Korea Department of Mechanical Engineering Pusan National University Busan Republic of Korea

ISBN: (纸本)9781509020669

To produce good quality of steel plates, scratches on steel plate should be minimized in hot rolling process. The new method, flying touch algorithm is introduced to control the gap between upper and lower roller for reducing scratches. In the flying touch method, the uniformity of coil can be debased due to variation of reaction force between rollers and steel plate. Therefore, the robust control algorithm and force estimation method is needed to apply flying touch method to hot rolling process. This paper introduces sliding mode control with sliding perturbation observer (SMCSPO) in flying touch hot rolling process. This paper also survey the effect of improved smoothen curve trajectory for realizing the flying touch and velocity synchronization on rolling mills' roller to reduce a scratch due to a friction force caused by the velocity desynchronization.

关键词： Steel Force Friction Mathematical model Rubber Torque Belts

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Dynamic object tracking of a quad-rotor with image processing and an extended Kalman filter

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Journal of Institute of Control, robotics and Systems 2015年第7期21卷 641-647页

作者： Kim, Ki-jung Yu, Ho-Yun Lee, Jangmyung Department Interdisciplinary Program in Robotics Pusan National University Korea Republic of Depart of Electrical Engineering Pusan National University Korea Republic of

This paper proposes a new strategy for a quad-rotor to track a moving object efficiently by using image processing and an extended Kalman filter. The goal of path planning for the quad-rotor is to design an optimal path from the start point to the destination point. To lengthen the freight time of the quad-rotor, an optimal path is required to reduce the energy consumption. To track a moving object, the mark signed on the moving object has been detected by a camera mounted first on the quad-rotor. The center coordinates of the mark and its area are calculated through the blob analysis which is one type of image processing. The mark coordinates are utilized to obtain information on the motion direction and the area of the mark is utilized to recognize whether the object moves backward or forward from the camera on the quad-rotor. In addition, an extended Kalman filter has been applied to predict the direction and speed of the dynamically moving object. Through these schemes, it is aimed that the quad-rotor can track the dynamic object efficiently in terms of flight distance and time. Through the two different route freights of the quad-rotor, the performance of the proposed system has been demonstrated. © ICROS 2015.

关键词： Extended Kalman filters

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The evaluation of scratch reduction in Flying Touch method by using SMCSPO

The evaluation of scratch reduction in Flying Touch method b...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Sung jin Kim Hyun Hee Sung min Yoon Min Cheol Lee School of Interdisciplinary Program in Robotics Pusan National University Busan SouthKorea School of Mechanical Engineering Pusan National University Busan SouthKorea

Scratch defects is occur due to impact drop and friction between the roller and slab in the conventional hot rolling method. The Flying Touch method is one of the proposed methods to improve the scratch defects. Flying Touch method is available to soft touch between the rollers and the slab. Because roller is unfixed and flexible. And Flying Touch method is proposed synchronization of the rollers' angular velocity and the slab's surface velocity. In this paper, a simulator was designed to apply and verify the Flying Touch method. After, the actual implementation was velocity synchronization of Flying Touch method in the designed simulator. Performance of scratch reduction evaluated comparative experiment to velocity de-synchronization and velocity synchronization of Flying Touch method.

关键词： Synchronization Slabs Control systems Frequency modulation

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Reaction force estimation of hydraulic servo system using sliding perturbation observer

Reaction force estimation of hydraulic servo system using sl...

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IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM 2015

作者： Cha, Keum-Gang Yoon, Sung-Min Kim, Hyun-Hee Gim, Ki-Yeon Lee, Min-Cheol Department of Mechanical Engineering Pusan National University BusanKS102 Korea Republic of Interdisciplinary Program in Robotics Pusan National University BusanKS102 Korea Republic of School of Mechanical Engineering Pusan National University BusanKS102 Korea Republic of

ISBN: (纸本)9781467391078

In this paper, the estimation method of reaction force for electro-hydraulic servo system for movement is discussed. This reaction force estimation method is based on sliding perturbation observer that is robust observer technique. Before estimating reaction force, the modeling of electro-hydraulic servo system is processed. Before the fine modeling parameters of electro-hydraulic servo system, modeling equation is obtained through cylinder equation using expansion and shrinkage stroke process. After finding modeling equation, the obtaining accurate modeling parameter is carried out from signal compression method. After defining modeling parameter, reaction force estimation is operated by sliding perturbation observer. The analysis result of estimation for reaction force will be used for bilateral control with master-slave structure. © 2015 IEEE.

关键词： Estimation

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Predictive control of an efficient human following robot using Kinect sensor

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Journal of Institute of Control, robotics and Systems 2014年第9期20卷 957-963页

作者： Heo, Shin-Nyeong Lee, Jang-Myung Department of Interdisciplinary Program in Robotics Pusan National University Korea Republic of Department of Electrical Engineering Pusan National University Korea Republic of

This paper proposes a predictive control for an efficient human following robot using Kinect sensor. Especially, this research is focused on detecting of foot-end-point and foot-vector instead of human body which can be occluded easily by the obstacles. Recognition of the foot-end-point by the Kinect sensor is reliable since the two feet images can be utilized, which increases the detection possibility of the human motion. Depth image features and a decision tree have been utilized to estimate the foot endpoint precisely. A tracking point average algorithm is also adopted in this research to estimate the location of foot accurately. Using the continuous locations of foot, the human motion trajectory is estimated to guide the mobile robot along a smooth path to the human. It is verified through the experiments that detecting foot-end-point is more reliable and efficient than detecting the human body. Finally, the tracking performance of the mobile robot is demonstrated with a human motion along an 'L' shape course. © ICROS 2014.

关键词： Mobile robots

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Outdoor localization for a quad-rotor using extended Kalman filter and path planning

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Journal of Institute of Control, robotics and Systems 2014年第11期20卷 1175-1180页

作者： Kim, Ki-Jung Lee, Dong-ju Kim, Yoon-Ki Lee, Jang-Myung Department Interdisciplinary Program in Robotics Pusan National University Korea Republic of Depart of Electrical Engineering Pusan National University Korea Republic of

This paper proposes a new technique that produces improved local information using a low-cost GPS/INS system combined with Extended Kalman Filter and Path Planning when a Quad-rotor flies. In the research, a low-cost GPS is combined with INS by Extended Kalman Filter to improve local information. However, this system has disadvantages in that estimation accuracy is getting worsens when the Quad-rotor flies through the air in a curve and precision of location information is influenced by performance of the used GPS. An algorithm based on Path Planning is adopted to deal with these weaknesses. When the Quad-rotor flies outdoors, a short moving path can be predicted because all short moving paths of quad-rotor can be assumed to be straight. Path planning is used to make the short moving path and determine the closest local information of data of the GPS/INS system to location determined by path planning. Through the foregoing process, improved local data is obtained when the quad-rotor flies, and the performance of the proposed system is verified from various outdoor experiments. © ICROS 2014.

关键词： Extended Kalman filters

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