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Measurement of Illusion Effect When Putting with Eyes Foveating on the Hole vs. Ball
심재호(Jaeho Shim),정혁(Hyuk Chung) 한국체육측정평가학회 2014 한국체육측정평가학회지 Vol.16 No.3
Goodale & Milner(1992)의 연구에 따르면 골프 퍼팅과 같이 느린 자조과제(self-paced task)에서도 빠른 공을 가로챌 때 요구되는 것과 동일한 캡슐화 시각운동성 시스템(encapsulated visuomotor systems)이 사용된다. 성공적인골프 퍼팅을 위해서는 정확한 방향과 거리 판단이 선행되어야 하는데 이때 수행자는 착시의 영향을 받는 것으로 알려져 있다. 이 연구의 목적은 퍼팅 수행이 입력된 감각정보를 다르게 변형시키는 피질 경로를 통해 이뤄지는지 알아보는것이었다. 실험 1에서는 퍼팅 과제 수행 시 숙련자와 초급자 모두 Muller-Lyer 착시효과의 영향을 받는 것으로 나타났다. 실험 2에서는 퍼팅 수행 시 시선을 공 대신 홀컵에 고정시키도록 하였다. 초급자 집단은 착시의 영향을 받은 것으로 나타난 반면 숙련자 집단은 익숙하지 않은 시선 고정 위치에도 불구하고 착시의 영향을 받지 않았다. 수행을 하는 데 있어서 시선이 고정되는 위치는 매우 중요하다. 표적(홀컵)이 주변시야에 위치하면 숙련자이더라도 퍼팅 시 착시를 유도하는 환경중심적인 맥락의존 정보(context-dependent information)에 의존하는 점에 대해 논의하였다. Goodale and Milner (1992) proposed that the same encapsulated visuomotor systems required in interceptinga fast ball will be used in slower, self-paced tasks such as putting. The purpose of the study was todetermine if putting is mediated by distinct cortical pathways that transform sensory inputs differently. InExperiment 1, both expert and novice players were unable to resist Muller-Lyer illusion when putting. InExperiment 2, when expert and novice players foveated their eyes on the hole instead, only experts resistedillusion despite the unfamiliarity and awkwardness of gazing on the hole rather than the usual ball. We argue that foveal vision plays a critical role in action and that when the target is observed in peripheralvision, regardless of expertise, the putting relies on allocentric, context-dependent information that leadsto illusion.
Active Linear Actuator와 Filter-XLMS알고리즘을 이용한 차량의 능동진동제어
곽문규(Moon K. Kwak),이한동(Handong Lee),김정훈(Jeonghoon Kim),송윤철(Yoonchul Song),심재호(Jaeho Shim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper deals with the Filtered-X Least Mean Square algorithm for a active vibration control in vehicle vibration reduction. The real-time implementation of FxLMS algorithm is discussed in detail. Before applying the proposed FxLMS algorithm to automobile, the performance of the ALA and FxLMS algorithm is tested using cantilever beam and accelerometer. The disadvantage of the FxLMS algorithm is that the plant model should be incorporated into the computation path. In this paper, the system identification was carried out based on the measurement result. The control algorithm is then realized using dSpace DS1104 controller board. Experimental results shown that the proposed control algorithm can reduce vibration level in a short period of time.
휴대성과 안전을 고려한 개인 이동 수단용 접이식 헬멧 개발
이인수(In Su Lee),김두언(Dueon Kim),이상운(Sangwoon Lee),홍하은(Ha Eun Hong),심재호(Jaeho Shim),박상인(Sang-in Park) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The rapid expansion of Personal Mobility (PM) devices, such as electric scooters, bicycles, and segways, has led to a concerning trend of non-compliance with helmet usage among riders. To address this issue, we present a noble foldable helmet design that encourages users to wear helmets, providing enhanced convenience. To develop the design, we focus on three technical and aesthetic features: cellular material, foldability, and manufacturability. Cellular material, such as lattice structures and triply periodic minimal surface (TPMS) structures shows exceptional shock absorbing capability. Thus, it provides structural functionality for PM helmets. Moreover, it significantly reduces the helmet’s weight while simultaneously enhancing airflow, thereby greatly improving comfort during wear. Foldability ensures portability, allowing users to carry the helmet without any effort when not in active use. The additive manufacturing (AM) enables to fabricate complex shapes, such as TPMS-based inner cushion in the proposed design. This paper provides a comprehensive overview of the entire design process, including material selection, modeling procedure and manufacturing technique. We employed the finite element analysis to validate safety of the proposed design. We also present communication methodology through the design process among mechanical engineers and industrial designers.