Hee-Chan Song

Korea University

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Real-time Beam Exposure Time Control of Holographic Data Storage

Transactions of the Society of Information Storage Systems (2010)

Cho-Lok Han Nak-Yeong Kim Hee-Chan Song Sung-Yong Lim No‐Cheol Park

Holographic data storage system is one of next generation high density optical memories. Thereby storing multiple data pages using multiplexing method in one spot, we can achieve high store density and fast access time. However, for uniform writing, we must control exposure time properly by the change of writing material characteristics. Many studies have been investigated about exposure time scheduling. However, once it is decided, we cannot change the scheduled time. Therefore, it is hard to obtain uniform data intensity. In this study, we propose exposure time control method using additional red beam as the monitoring signal. Through reconstructed red beam intensity in real time, we can adjust exposure time by the writing condition change. We construct compensation method mathematically and verify the feasibility of proposed method through the experiments.

Holographic Data Storage

Source

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USB assembly strategy based on visual servoing and impedance control

Hee-Chan Song Mincheol Kim Jae-Bok Song

In this paper, we propose an assembly strategy for the insertion of an USB cable, which is one of the well-known connector cables, into a corresponding USB port. This strategy is required to automate the inspection process of USB ports. In the proposed method, we use the information from the camera and a force/torque sensor to minimize position uncertainties. The features of a USB port are detected by the vision system and the end-effector of the robot quickly moves to the front of the USB port through visual servoing. After that, an impedance controller is adopted to achieve a compliant contact motion and to overcome any existing translational/angular errors. The performance of the proposed USB assembly strategy was evaluated by a series of experiments using a 6 DOF industrial robot equipped with a force/torque sensor.

Visual Servoing

Impedance Control

Port (circuit theory)

Host controller interface

Robot end effector

10.1109/urai.2015.7358873

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Citations (8)

Force control based jigless assembly strategy of a unit box using dual-arm and friction

Young-Loul Kim Hee-Chan Song Jae-Bok Song

There can be many issues when automating a cell manufacturing process using a robot, and the use of a jig is one of them. The last step of a manufacturing process is closing the lid of a product, and it is desirable to perform such a task without using a jig to improve the manufacturing efficiency. In this study, we propose a novel algorithm which uses a dual-arm robot or the friction of the box to compensate for the initial position and orientation errors between the box and the lid. Then, force control can be used to combine the proposed algorithm with an assembly algorithm, enabling a robot to close the lid of a box without a jig regardless of its initial position and orientation errors. The performance of the proposed algorithm was verified through experiments.

Position (finance)

Grippers

10.1109/isr.2013.6695701

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Citations (3)

Tool path generation based on matching between teaching points and CAD model for robotic deburring

2022 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM) (2012)

Hee-Chan Song Byeong-Sang Kim Jae-Bok Song

Deburring is a machining process which involves much noise, vibration and dust, so it can be harmful to workers. Therefore, much research has been done to use a manipulator to perform deburring instead of human workers. The precise tracking of the contour of an arbitrary-shaped part is of major concern in robotic deburring. In this study, a tool path generation method based on the CAD model and the direct teaching method is proposed to minimize the position and orientation errors of the workpieces. Without knowledge of the position and orientation of the workpiece, which is often hard to obtain, the optimal deburring trajectory can be generated by matching the extracted tool path from the CAD model to the teaching points. Furthermore, impedance control is used to avoid applying excessive contact force. From a series of experiments on robotic deburring, the performance of the proposed algorithm is verified.

Position (finance)

Impedance Control

Machine tool

Tracking (education)

10.1109/aim.2012.6265921

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Citations (17)

Tracking servo method using reflective optical filter for holographic data storage system

Microsystem Technologies (2011)

Hee-Chan Song Na-Kyeong Kim Do‐Hyung Kim Sung-Yong Lim Jang Hyun Cho

Optical disc

Tracking (education)

Tracking system

Tracking error

Servomechanism

Holographic Data Storage

10.1007/s00542-011-1293-z

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Citations (4)

P-OPT-05 EVALUATION OF SERVO METHOD DESIGNED FOR THE HOLOGRAPHIC DATA STORAGE SYSTEM(Optical Storage/Optical Devices for Storage,Technical Program of Poster Session)

Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment IIP/ISPS joint MIPE (2009)

Sang-Hoon Kim Hee-Chan Song Sung Yong Lim Hyunseok Yang Joo-Youn Park

Servo control system developed for holographic data storage system(HDSS) can be said as two types. The first type uses servo layer on the media and red laser for tracking and focusing servo control similar to conventional ODD, and the other type uses analyzed data of captured image. CISD(Center for Information Storage Device) in Yonsei University studied about servo control system of HDSS and developed another type of servo method using servo beam servo track writing method. In this paper, optical and mechanical characteristics of servo system developed by CISD are analyzed, and feasibility of the servo system is evaluated.

Servomechanism

Optical disc

Optical storage

10.1299/jsmemipe.2009.439

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