• Journal of Computing Science and Engineering
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• 제7권2호
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• pp.122-131
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• 2013

The MPI CyberMotion Simulator provides a unique motion platform, as it features an anthropomorphic robot with a large workspace, combined with an actuated cabin and a linear track for lateral movement. This paper introduces the simulator as a tool for studying human perception, and compares its characteristics to conventional Stewart platforms. Furthermore, an experimental evaluation is presented in which multimodal human control behavior is studied by identifying the visual and vestibular responses of participants in a roll-lateral helicopter hover task. The results show that the simulator motion allows participants to increase tracking performance by changing their control strategy, shifting from reliance on visual error perception to reliance on simulator motion cues. The MPI CyberMotion Simulator has proven to be a state-of-the-art motion simulator for psychophysical research to study humans with various experimental paradigms, ranging from passive perception experiments to active control tasks, such as driving a car or flying a helicopter.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.321-323
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• 2015

Monitoring crane motion in real time is the first step to identifying and mitigating crane-related hazards on construction sites. However, no accurate and reliable crane motion capturing technique is available to serve this purpose. The objective of this research is to explore a method for real-time crane motion capturing and investigate an approach for assisting hazard detection. To achieve this goal, this research employed various techniques including: 1) a sensor-based method that accurately, reliably, and comprehensively captures crane motions in real-time; 2) computationally efficient algorithms for fusing and processing sensing data (e.g., distance, angle, acceleration) from different types of sensors; 3) an approach that integrates crane motion data with known as-is environment data to detect hazards associated with lifting tasks; and 4) a strategy that effectively presents crane operator with crane motion information and warn them with potential hazards. A prototype system was developed and tested on a real crane in a field environment. The results show that the system is able to continuously and accurately monitor crane motion in real-time.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.449-450
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• 2011

• 소음진동
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• 제4권1호
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• pp.83-88
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• 1994

물체를 한 위치에서 타 위치로 잔류 진동없이 움직이려 하는 경우가 많다. 본 논문에서는 한 질량이 다른 질량과 스프링에 의해 움직이는 경우와 진자가 지지 점의 운동에 의해 움직이는 경우에 관해 논하였다. 각 경우에 있어서 시스템은 정지 상태에서 출발한 후 최종위치에서 다시 멈추는 것으로 간주하였다. 본 논문에 주어진 운동방식에 대한 기본 전략은 엔진 캠-구동자 형태의 설계시 단순화된 모형으로부터 도출되었다. 이와 같은 형태로 시스템을 움직이는데 필요한 힘과 최대힘 및 그때 소요되는 시간이 계산되었다.

• 한국산업융합학회 논문집
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• 제17권4호
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• pp.211-216
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• 2014

In general, gantry robot is very useful handling of heavy objects. But rope-driven yard cranes must have a little of sway and skew motion because ropes are passive mechanical device. So many researches have been concentrated on anti-sway algorithm controlling trolley speed. These approaches require sway angle. But it is very difficult to know sway angle and its derivative. Therefore control algorithm of trolley speed is not practical in general. On the contrary, control strategy using auxiliary rope is very useful to sway control of yard crane because rope length is shorter than quay-side container cranes. In this paper, we derive equations of motion of trolley system which have anti-sway controller to use auxiliary rope. And we propose the control strategy and analyse the behavior of the proposed system.

• 대한의용생체공학회:의공학회지
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• 제30권5호
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• pp.381-392
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• 2009

Due to the aging effect, older people have relatively weaker muscular performance, less range of motion in the joint articulation, and the lower sense of equilibrium than younger people. These factors attribute to their slow and clumsy ingress/egress motion. In order to analyze ingress/egress motion strategy of the elderly, healthy thirty 65 or more years old volunteers were recruited. The health condition of the each volunteer was verified by the medical checkup and also their physical capabilities were quantified by six fitness tests. Through the video analysis, older driver's ingress/egress motion strategies were classified and statistically investigated. For a comparison purpose, another thirty young volunteers also participated in the same test protocol and their ingress/egress motion strategies were also included in the statistical analysis.

• 한국산학기술학회논문지
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• 제11권7호
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• pp.2579-2585
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• 2010

본 논문은 단안 카메라로부터 입력된 영상에서 모션 기반의 검색을 사용한 동적인 사람 자세 추적 방법을 제안한다. 제안된 방법은 3차원 공간에서 하나의 사람 자세 후보를 생성하고, 생성된 자세 후보를 2차원 이미지 공간으로 투영하여, 투영된 사람 자세 후보와 입력 이미지와의 특징 값 유사성을 비교한다. 이 과정을 정해진 조건을 만족 할 때까지 반복하여 이미지와의 유사성과, 신체 부분간 연결성이 가장 좋은 3차원 자세를 추정한다. 제안된 방법에서는 입력 이미지에 적합한 3차원 자세를 검색할 때, 2차원 영상에서 추정된 신체 각 부분들의 모션 정보를 사용해 검색 공간을 정하고 정해진 검색 공간에서 탐색하여 사람의 자세를 추정한다. 2차원 이미지 모션은 비교적 높은 제약이 있어서 검색 공간을 의미있게 줄일 수 있다. 이 방법은 모션 추정이 검색 공간을 효율적으로 할당 해주고, 자세 추적이 여러 가지 다양한 모션에 적응할 수 있다는 장점을 가진다

• The Journal of Advanced Prosthodontics
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• 제14권2호
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• pp.88-95
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• 2022

PURPOSE. This study investigated the accuracy of full-arch intraoral scans obtained by various scan strategies with the segmental scan and merge methods. MATERIALS AND METHODS. Seventy intraoral scans (seven scans per group) were performed using 10 scan strategies that differed in the segmental scan (1, 2, or 3 segments) and the scanning motion (straight, zigzag, or combined). The three-dimensional (3D) geometric accuracy of scan images was evaluated by comparison with a reference image in an image analysis software program, in terms of the arch shape discrepancies. Measurement parameters were the intermolar distance, interpremolar distance, anteroposterior distance, and global surface deviation. One-way analysis of variance and Tukey honestly significance difference post hoc tests were carried out to compare differences among the scan strategy groups (α = .05). RESULTS. The linear discrepancy values of intraoral scans were not different among scan strategies performed with the single scan and segmental scan methods. In general, differences in the scan motion did not show different accuracies, except for the intermolar distance measured under the scan conditions of a 3-segmental scan and zigzag motion. The global surface deviations were not different among all scan strategies. CONCLUSION. The segmental scan and merge methods using two scan parts appear to be reliable as an alternative to the single scan method for full-arch intraoral scans. When three segmental scans are involved, the accuracy of complete arch scan can be negatively affected.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.383-387
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• 1996

This paper presents a steering control strategy applicable to vehicle path following problems. This control strategy is based on realistic nonlinear equations of motion of multibody systems described in terms of relative joint coordinates. The acceleration of the steering angle is selected as a control input of the system. This input is obtained by considering position and slope errors at current and at advance times. This steering control strategy is tested in circular and lane change maneuvers with a nonlinear vehicle model.

• 과학교육연구지
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• 제39권3호
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• pp.333-342
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• 2015

이 연구는 단계적 상황 교수자료를 개발하고 대학 물리학 수업에 적용하여 물리 학습에 대한 효과를 조사하는 데 있다. 연구대상은 지방 소재 대학의 사범대학 자연계열 1학년 대학생 총 35명으로 했다. 단계적 상황 교수자료는 상황 이상화하기, 상황 확장하기, 상황 비교하기 단계로 개발하고, 일차원 운동, 이차원 운동, 뉴턴의 운동 법칙 등 6차시 물리 수업에 적용했다. 물리 학습에 대한 효과는 힘 개념 검사지(FCI)와 물리 학습에 대한 신념(MPEX) 설문지를 사용하여 조사했다. 연구결과 단계적 상황 교수자료는 대학생의 힘 개념 변화에는 효과가 있었지만, 물리 학습에 대한 신념에는 유의미한 변화가 없었다. 결론적으로 단계적 상황 교수 학습 전략으로 개발된 교수자료는 학생에게 과학개념을 다양한 상황에 적용하는 기회를 주어 물리 개념 변화를 돕는 데 효과가 있다. 끝으로 연구 결과들을 통해 단계적 상황 물리 수업에 대한 교육적 시사점을 논의했다.