• 대한전자공학회논문지SP
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• 제41권5호
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• pp.99-109
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• 2004

본 논문에서는 웹 로봇과 핑거프린팅 기법을 이용하여 인터넷에 배포되어 있는 이미지 콘텐츠를 자동으로 수집하고 원구매자를 식별하는 기법을 소개한다. 핑거프린팅 기법은 워터마킹 기법의 확장 기술로 구매자의 정보를 콘텐츠에 삽입/추출하는 저작권보호 기법의 하나이다. 콘텐츠 내에 삽입된 핑거프린트는 콘텐츠를 식별하는 식별자의 역할을 할 뿐만 아니라 원 구매자의 정보도 가지고 있어서 콘텐츠의 저작권 보호에도 활용된다. 본 논문에서는 이미지 검색 엔진과 핑거프린팅 기법을 혼합한 능동적 콘텐츠 추적 시스템을 제안한다. 제안된 시스템은 콘텐츠가 배포되기 전에 원 구매자의 정보를 핑거프린트로 삽입하고 구매기록을 저장한다. 배포된 콘텐츠는 웹 로봇에 의해 자동으로 수집되고 동시에 핑거프린트 정보가 추출되어 서버에 저장된다. 콘텐츠의 식별은 추출된 핑거프린팅 정보와 배포 시점에 저장된 판매기록을 비교하여 이루어진다.

• 농업과학연구
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• 제23권2호
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• pp.227-232
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• 1996

육묘상자는 매우 유연하므로 인력에 의존하여 취급하는데는 많은 애로사항이 발생한다. 그러므로 본 연구에서는 육묘상자를 취급하기 위하여 수직축, 수평축를 갖춘 핑거의 로봇 핸드를 개발하였다. 수평축의 길이를 달리하여 육묘상자의 각 지점의 처짐량을 측정하였다 핑거의 수평길이가 250mm 일 때 $540{\times}270mm$의 육묘상자의 처짐량이 15mm이하로 되어 적당하다라고 판단된다. 본 연구에서 사용한 핑거의 움직임에는 LM시스템을 사용하였다. 개발한 로봇 핸드는 충남대학교 농업기계공학과에 기 보유하고 있는 직교좌표형 로봇 본체에 장착하여 성능실험을 실시한 결과 만족할 만한 결과를 얻었다. 앞으로 전용 로봇 본체를 개발하여 실용화 되기를 기대한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1613-1616
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• 1997

In order to develop a human hand mechanism, a 5-bar finger with redundant actuation is designed and implemented. an optimal set of acutator locations and link lengths for the case of one redundant actuator is obtained by employing a composite design index which simulataneously consider several performance indices such as workspace, isotropic index, and force transmission ratio. Each joing is driven by an compact actuator mechanism having ultrasonic motor and a gear set with poeneiometer an controlled by VME Bus-based control system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1060-1067
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• 2005

This paper attempts to derive and analyze the dynamic system of pinching a rigid object by means of two multi-degrees-of-freedom robot fingers with soft and deformable tips. It is shown firstly that a set of differential equation describing dynamics system of the manipulators and object together with geometric constraint of tight area-contacts is formulated by Lagrange's equation. It is shown secondly that the problems of controlling both the forces of pressing object and the rotation angle of the object under the geometric constraints are discussed. In this paper, the control method for dynamic stable grasping and enhancing dexterity in manipulating things is proposed. It is illustrated by computer simulation that the control system gives the performance improvement in the dynamic stable grasping of the dual fingers robot with soft tips.

• 대한기계학회논문집
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• 제18권8호
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• pp.2016-2025
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• 1994

A hierarchical planning strategy for dextrous manipulation of multifingered hands with soft finger contact model is proposed. Dextrous manipulation planning can be divided into a high-level stage which specifies the position/orientation trajectories of the fingertips on the object and a low-level stage which determines the contact forces and joint trajectories for the fingers. In the low-level stage, various nonlinear optimization problems are formulated according to the contact modes and integrated into a manipulation planning algorithm to find contact forces and joint velocities at each time step. Montana's contact equations are used for the high-level planning. Quasi-static simulation results are presented and illustrated by employing a three-fingered hand manipulating a sphere to demonstrate the validity of the proposed low-level planning strategy.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.670-673
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• 2000

This paper attempt analysis and computer simulation of dynamics of a set of dual multi-joint fingers with soft-deformable tips which are grasping. Firstly, a set of differential equation describing dynamics of the fingers and object together with geometric constraint of tight area-contacts is formulated by Euler-Lagrange's formalism. Secondly, problems of controlling both the internal force and the rotation angle of the grasped object under the constraints of area-contacts of tight area-contacts are discussed. The effect of geometric constraints of area-contacts on motion of the overall system is analyzed and a method of computer simulation for overall system of differential-algebraic equations is presented. Finally, simulation results are shown and the effects of geometric constraints of area-contact is discussed.

• 제어로봇시스템학회논문지
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• 제16권9호
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• pp.846-851
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• 2010

In this paper, we newly propose a novel control strategy of a three joints-robot finger for the purpose of artificial hands. The robot finger is specifically modeled by using a 3D CAD program (CATIA), considering human fingers, and then the proposed control method is verified through the dynamic simulation tool (Simulink and Recurdyn R2). Each slider is individually controlled to be located at the optimal positions where the maximal joint torque can be generated. To prove the effectiveness of the proposed control method, we devise two cases for the reference position of sliders. By comparing the control performance of two cases, the validity of the proposed control method will be verified.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1997년도 동계 학술대회 논문집
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• pp.88-98
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• 1997

This study was conducted to develope the gripper of a robotic transplanter for bedding plants. Specific objectives of this study were 1) to develope the gripper for plug tray seedlings and 2) to find the suitable finger type for transplanting. The performance of gripper was tested and compared by two different transplanting methods, which were to consider the leaf position of seedlings and not to consider. The results of this study are summarized as follows. (1) The gripper of a robotic transplanter was developed and tested with 4 different finger type. (2) The shovel type finger was suitable for transplanting with the least percent of damaged seedlings.

• 로봇학회논문지
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• 제3권4호
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• pp.315-322
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• 2008

A new soft finger mechanism using a spring as a backbone is proposed in this work. It is a 4 DOF mechanism that consists of a spring and 3 cylinders, which behave like joints with 3 up-and-down rotations and 1 left-and-right rotation. To control each joint, cylinders have small holes in their cross-sectional areas, and wires of different length are penetrated into these holes. We can control each joint by pulling the corresponding wire. The forward kinematics is solved by using the geometry of mechanism. And the relationship (Jacobian) between the linear velocity of the wires and the joint angular rate is obtained. A virtual simulator is developed to test the validity of the kinematic model. In the experiment, first, the position control is conducted by tracking a given trajectory. Second, to verify the flexibility and safety, we show that the soft finger deflects in a safe manner, in spite of the collision with environment.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1997년도 전력전자학술대회 논문집
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• pp.449-453
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• 1997

이 논문은 초음파모터를 이용한 직접구동방식의 전완로봇 개발에 관해서 논하였다. 기어 감속 없이 느린 동작하에서 큰 힘을 제공하기 위해 진행파형 초음파모터를 액츄에이터로 사용하였다. 이 시스템에서는 환경과의 상호작용력에 의한 힘 피드백 제어는 사용하지 않고, 위치 정보만을 사용하였다. 크랭크 회전같은 접촉작업과 핑거의 협력작업에 대한 실험을 고찰하였다.