• 한국공작기계학회논문집
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• 제14권4호
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• pp.22-31
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• 2005

The purpose of this study is to design a flexural structure that has a function of pan and tilt for an artificial eyeball. The artificial eyeball system has a function of image stabilization, which compensate panning and tilting vibration of the body on which the artificial eyeball is attached. The target closed loop control bandwidth is 50Hz, so the mechanical resonance frequency is required to be more than the control bandwidth, which is a tough design problem because of a big mass of camera and actuator. In this study, the design process including the selection of the principal parameters by numerical analysis with ANSYS will be described, as well as the design results and frequency response.

• 한국정밀공학회지
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• 제31권6호
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• pp.535-541
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• 2014

In this research, three degree-of-freedom parallel spherical robot is developed for an artificial eyeball. The proposed system is comprised of a moving and a base plate, three prismatic actuators, and a ball joint for an angular movement of the moving plate. The vector analysis is employed to investigate the relationship between positions of the actuators and a pose of the moving plate. The required ranges for every actuators are calculated using the derived inverse kinematics in regard to the combination of two different levels for the size of the system component. Then the size of every components is determined from the analyzed trend. PI controller is employed for the position control of the moving plate. Finally the proposed system is verified using an arbitrary path of the angular movement.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권5호
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• pp.222-227
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• 2002

Recently, the research on artificial retina for the blind is active. In this paper a new optical link method for the retinal prosthesis is proposed. Laser diode system was chosen to transfer image into the eye in this project and the new optical system was designed and evaluated. The use of laser diode array in artificial retina system makes system simple for lack of signal processing part inside of the eyeball. Designed optical system is enough to focus laser diode array on photodiode array in 20$\times$20 application.

• 방송공학회논문지
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• 제25권4호
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• pp.537-544
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• 2020

본 논문에서는 FACS(Facial Action Coding System)에 기반을 둔 안드로이드 로봇 헤드의 개발을 통한 감정표현 방법을 제안한다. 안드로이드 로봇은 인간과 가까운 외모를 가진 로봇을 말하며, 인공 피부, 인공 근육을 가지고 있다. 감정 표현을 로봇으로 구현하기 위해서는 인공 근육의 개수와 배치를 정하여야 하는데 이를 위해 인간의 얼굴 움직임을 해부학적으로 분석하였다. FACS는 해부학을 기반으로 하여 표정을 만들 때의 얼굴의 움직임을 분석한 시스템이다. FACS에서는 표정은 AU(Action Unit)의 조합으로 만들어지며, 이 AU를 기반으로 로봇의 인공 근육의 수와 위치를 정하게 된다. 개발된 안드로이드 헤드는 30개의 인공 근육에 해당되는 모터와 와이어를 가지고 있으며, 표정 구현을 위한 인공 피부를 가지고 있다. 제한된 머리 공간에 많은 모터를 탑재하기 위해 spherical joint와 스프링을 이용하여 초소형 안구 모듈이 개발되었고, 와이어 경로의 효율적인 설계를 기반으로 30개의 모터가 배치되었다. 제작된 안드로이드 헤드는 30 자유도를 가지고 13개의 기본 감정 표현을 구현 가능하였고, 전시회에서 일반 관람객들을 대상으로 인식률을 평가 받았다.

• 한국동물위생학회지
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• 제45권3호
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• pp.221-228
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• 2022

Cataracts occur commonly in older dogs, which can lead to partial or complete vision loss. In the present study, a 12-year-old male poodle presented for evaluation of ocular sinister (OS) cataract. This study was a clinical case report on the process of performing surgery using phacoemulsification (PHACO) and the problems that arise in patient diagnosed with OS cataract. In the oculus dexter (OD), the artificial eye was inserted because there was no electroretinography (ERG) response. In the OS, the ERG was 51.6 μV, so operation was performed because the visual pathway function remained. Slit-lamp biomicroscopy of the OS showed complete loss of vision as a hypermature cataract and that the lens was hardened. During the cataract surgery using PHACO, visco-elastic agents were used to maintain the shape of the eyeball, and the PHACO procedure took 3.13 minutes. The hardened lens and visco-elastic agents were removed from the eye through PHACO surgery, and the operation was completed by inserting an intraocular lens (IOL). As a result of managing IOP for 2 months after surgery, it remained stable at a maximum of 19 mmHg, and no postoperative ocular hypertension (POH) occurred. Currently, one year has passed since the operation, and the dog maintains its daily life with its left eye without any problems.