• 대한기계학회논문집A
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• 제29권11호
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• pp.1509-1517
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• 2005

This paper presents the two degree-of-freedom(DOF) planar parallel mechanism called 2R$\underline{P}$R-RP manipulator, whose degree-of freedom is dependent on a passive constraining leg connecting the base and the platform. First, the kinematic analysis of the mechanism is performed analytically: the inverse and forward kinematic problems are solved in the closed font the practical workspace is systematically derived, and all of the singular configurations are examined. Then, in order to determine the geometric parameters and the operating limits of the actuators, the optimization of the mechanism is performed considering its dexterity and stiffness. Finally, the kinematic performances of the optimized mechanism are evaluated through comparing to the 5-bar parallel manipulator.

• 제어로봇시스템학회논문지
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• 제12권5호
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• pp.464-472
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• 2006

This paper presents the two degree-of-freedom (DOF) planar parallel mechanism, called the $2{\underline{R}}RR-RP$ manipulator, whose degree-of-freedom is dependent on an additional passive constraining leg connecting the base and the platform. First, the kinematic analysis of the mechanism is performed: the inverse and forward kinematic problems are analytically solved, the workspace is systematically derived, and all of the singular configurations are examined. Then, in order to determine the geometric parameters the optimization of the mechanism is performed considering its dexterity, stiffness, and space utilization. Finally, the kinematic performances of the optimized mechanism are evaluated through the comparison study to the conventional 5-bar parallel manipulator.

• 대한기계학회논문집A
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• 제28권5호
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• pp.495-502
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• 2004

In this paper, kinematic structure of parallel manipulator having 6-DOF is determined to follow the specific trajectory represented by several curves expressed by the parametric variable functions. In addition, the parallel manipulator is designed to have a high dexterity by considering a kinematic isotropy which can stabilize the motion of the moving platform in the restricted workspace.

• 산업경영시스템학회지
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• 제17권30호
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• pp.25-34
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• 1994

Mental workload has a improtant place in modern work environment such as human-computer interaction. Designing man-machine system requires knowledge and evaluation of the human cognitive process which controls information flow during our works. Many studies estimate reaction time as a index of menatal workload. This paper investigates what reflacts the workload of human information handling when the informations grow its degree. Experiment result introuce the memory time that explain the information-load more sensitive than react time. And react time shows learning effect but memory time does'nt show that effect So it can be concluded that cognitive learning or work schema needs more time to achieve dexterity than motor skill.

• 제어로봇시스템학회논문지
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• 제13권6호
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• pp.560-567
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• 2007

The objective of this research is to optimize the designing parameters of the parallel manipulator with large orientation workspace at the boundary position of the constant orientation workspace (COW). The method uses a simple genetic algorithm(SGA) while considering three different kinematic performance indices: COW and the global conditioning index(GCI) to evaluate the mechanism's dexterity for translational motion of an end-effector, and orientation workspace of two angle of Euler angles to obtain the large rotation angle of an end-effector at the boundary position of COW. Total fifteen cases divided according to the combination of the sphere radius of COW and rotation angle of orientation workspace are studied, and to decide the best model in the total optimized cases, the fuzzy inference system is used for each case's results. An optimized model is selected as a best model, which shows better kinematic performances compared to the basis of the pre-existing model.

• Journal of Mechanical Science and Technology
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• 제20권10호
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• pp.1614-1625
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• 2006

This paper presents the kinematics and workspace optimization of the two different 2-DOF (Degrees-of-Freedom) planar parallel mechanisms: one (called 2-RPR mechanism) with translational actuators and the other (called 2-RRR mechanism) with rotational ones. First of all, the inverse kinematics and Jacobian matrix for each mechanism are derived analytically. Then, the workspace including the output-space and the joint-space is systematically analyzed in order to determine the geometric parameters and the operating range of the actuators. Finally, the kinematic optimization of the mechanisms is performed in consideration of their dexterity and rigidity. It is expected that the optimization results can be effectively used as a basic material for the applications of the presented mechanisms to more industrial fields.

• 대한기계학회논문집A
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• 제30권12호
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• pp.1564-1572
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• 2006

This paper presents the kinematics and workspace optimization of the two different 2-DOF (Degrees-of-Freedom) planar parallel mechanisms: one (called 2-RPR mechanism) with translational actuators and the other (called 2-RRR mechanism) with rotational ones. First of all, the inverse kinematics and Jacobian matrix of each mechanism are derived analytically. Then, the workspace including the output-space and the joint-space is systematically analyzed in order to determine the geometric parameters and the operating range of the actuators. .Finally, the kinematic optimization of the mechanisms is performed with regards to their dexterity, stiffness and space utilization. It is expected that the optimization results can be effectively used as a basic material for the applications of the presented mechanisms to more industrial fields.

• 한국군사과학기술학회지
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• 제15권2호
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• pp.193-200
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• 2012

The selection factors of the protective clothing against the NBC agents are the protection(chemical, biological, TIMs), duration, weight/comfort, dexterity/mobility, size, visibility, cleaning and unit cost, etc. To develop the NBC protective clothing, we should need to review about the design concepts of the protective materials(shell and liner fabric) and form. This paper identify an important factors for the protective materials and form, and presents design strategies for important factors based on the evaluation results of the materials and the form.

• Archives of Plastic Surgery
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• 제50권1호
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• pp.96-100
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• 2023

The microsurgical anastomosis is integral to the success of autologous-free tissue transfer. Successful performance of this procedure relies strongly on operator dexterity, which can be made more challenging when blood and edematous fluids obscure the field of view. Workflow is impeded by intermittent irrigation and suctioning, necessitating presence of an assistant, with risk of arterial thrombosis, from vessels being drawn into suction drains. To negate these current disadvantages and minimize the barrier of entry to microvascular operations, we designed, manufactured, and patented a novel three-dimensional printed microsurgical background device with microfluidic capabilities that allow continuous suction and irrigation as well as provide platforms that enable multiangle retraction to facilitate operator autonomy. This was validated in an ex vivo model, with the device found to be superior to the current standard. We believe that this will have major applicability to the improvement of microsurgeon

• 한국콘텐츠학회논문지
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• 제15권4호
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• pp.519-529
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• 2015

이 연구에서는 성공적인 성인기 준비를 위한 진로 및 직업교육 프로그램 개발의 기초자료를 제공하기 위해, 신체능력, 작업능력, 정서 행동 영역, 기능적 적응 행동 요인을 중심으로 직업훈련 프로그램에 참여한 청년기 지적장애인들의 고용 유지 결정 요인을 알아보았다. 이를 위해 직업훈련 프로그램에 참여한 64명의 청년기 지적장애인을 대상으로 평가를 실시하고, 프로그램 수료 이후 6개월 시점에의 추적 조사를 통해 고용 유지 여부를 알아보았다. 이분형 로지스틱 회귀분석을 통해 고용 유지 결정 요인을 알아본 결과, 신체능력 중 양손 기민성(OR = 2.175), 작업 능력 중 소도구 사용 손기민성(OR = 1.123), 정서 행동 영역 중 불안(OR = .733)과 사회화 영역(OR = .429), 기능적 적응행동 영역 중 학습기술(OR = 1.077)과 직업기술 영역(OR = 1.542)이 고용 유지 결정 요인으로 나타났다. 이 연구를 통해 드러난 고용 유지 결정요인은 선행연구들에서 제시한 고용 유지에 영향을 미치는 요인들과 일치하는 것으로 나타났다. 고용 유지에 효과적인 진로 및 직업교육 프로그램 구성을 위해서는 고용 유지에 유의한 영향을 미치는 요인들에 대한 고려가 필요할 것으로 생각된다.