• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.59-64
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• 2008

In this paper, stability and transparency analysis for client/server haptic-based networked virtual environment (NVE) is introduced. From this analysis the appropriate communication structure for the more stable and transparent haptic interactions can be derived. Also, it is possible to expect and compensate the quality deterioration of haptic interactions according to certain network conditions In order to verify the usefulness of the analysis, simple haptic-based NVE application is implemented. For the stability verification, the vibration or strange movement of haptic interface and virtual object are measured under various network states. In addition, the usefulness of the proposed transparency analysis and network delay compensation scheme is verified by comparing distorted and compensated force feedbacks with real force feedback.

• 한국HCI학회:학술대회논문집
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• 2007.02b
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• pp.118-123
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• 2007

본 논문에서는 증강현실 기반 제품 디자인 시, 논문 [1]에서 제안된 몰입감 향상 기법들에 대한 사용성 평가를 통해, 사용자에게 다차원 피드백(multimodal feedback)을 제공하는 것이 몰입감 향상에 어떠한 영향을 미치는가에 대해 알아본다. 우선 기존의 데스크톱 기반의 디자인 환경과 다차원 피드백을 가능하게 하는 증강현실 기반 디자인 환경과의 비교 후, 시각 피드백에 대한 사용성 평가로써 증강된 가상객체에 의해 가려진 손을 다시 보이게 함으로 얻게 되는 실재감 향상 정도와 사용자의 입력에 따른 컨텐츠의 시각적 맵핑의 적절성을 평가한다. 또한 청각 피드백에 대한 평가 기준으로써 시나리오 상의 상황에 따른 배경음/효과음 맵핑의 몰입감과 적절성을 평가한다. 마지막으로 촉각 피드백에 대한 평가로써, 물리적인 감각형 객체에 가상객체를 정합함으로써 얻게 되는 촉감과 시나리오 상의 이벤트에 따라 제시되는 진동-촉각 피드백에 의한 몰입감 향상 정도를 평가한다. 제시된 사용성 평가의 결과는 기존의 증강현실 기반 디자인 시스템의 몰입감을 향상 시키기 위한 구현에 있어, 고려될 수 있는 사항으로써 의미가 있다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.3
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• pp.413-418
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• 2013

As haptic devices become increasingly important in various product fields, it becomes essential to design effective vibration patterns for better tactile sensitivities. Despite this trend, standardization in the design of vibration patterns has not been well established, which causes developers to neglect the effects of haptics while programming or developing products. To provide better tactile sensitivity, the present study introduces a vibration pattern design system and proposes guidelines for designing vibration patterns. This system consists of two modules: (1) a graphical pattern design and evaluation program and (2) a vibro-tactile display device for prototyping the designed vibration patterns.

• Journal of Internet Computing and Services
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• v.25 no.1
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• pp.9-15
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• 2024

As virtual reality technology became popular, a high demand emerged for natural and efficient interaction with the virtual environment. Mid-air manipulation is one of the solutions to such needs, letting a user manipulate a virtual object in a 3D virtual space. In this paper, we focus on manipulating a remote virtual object while visually displaying the object and providing tactile information on the object's weight. We developed two types of wearable interfaces that can provide cutaneous or vibrotactile feedback on the virtual object weight to the user's fingertips. Human perception of the remote virtual object weight during manipulation was evaluated by conducting a psychophysics experiment. The results indicate a significant effect of haptic feedback on the perceived weight of the virtual object during manipulation.

• Smart Media Journal
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• v.1 no.4
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• pp.8-17
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• 2012

In this paper, we introduce the appoaches that aim to improve user experience in mobile device by the use of multiple vibration signal feedback, conducted by Haptics and Virtual Reality laboratory at POSTECH. We introduce current progresses of our 'Vibrotactile flow using multiple vibration actuators' and 'Real-time dual-channel haptic music player.' The 'Vibrotactile flow using multiple vibration actuators' produces vibrotactile flow sensations by using multiple actuators and that improves the information transfer on mobile devices. The 'Real-time dual-channel haptic music player' generates vibrotactile sensation by transforming auditory signal, which improves the user experience of mobile devices. These approaches can be good examples to fulfill the demands of better information transfer capability and user experience on mobile devices.

• KIPS Transactions on Software and Data Engineering
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• v.12 no.6
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• pp.275-284
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• 2023

Virtual reality simulations are used for education and training in various fields, and are especially widely used in the medical field recently. The education/training simulator consists of tactile/force feedback generation and image/sound output hardware that provides a sense similar to a doctor's treatment of a real patient using real surgical tools, and software that produces realistic images and tactile feedback. Existing simulators are complicated and expensive because they have to use various types of hardware to simulate various surgical instruments used during surgery. In this paper, we propose a dental surgical simulation system using a force feedback device and a morphable haptic controller. Haptic hardware determines whether the surgical tool collides with the surgical site and provides a sense of resistance and vibration. In particular, haptic controllers that can be deformed, such as length changes and bending, can express various senses felt depending on the shape of various surgical tools. When the user manipulates the haptic feedback device, events such as movement of the haptic feedback device or button clicks are delivered to the simulation system, resulting in interaction between dental surgical tools and oral internal models, and thus haptic feedback is delivered to the haptic feedback device. Using these basic techniques, we provide a realistic training experience of impacted wisdom tooth extraction surgery, a representative dental surgery technique, in a virtual environment represented by sophisticated three-dimensional models.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.1175-1176
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• 2014

철강 공정에서는 조업자의 조업 역량이 제조 생산성에 결정짓는 중요한 요소이다. 그럼에도 불구하고 조업자의 훈련을 위한 기반 마련이 되어 있지 않은 실정이다. 이런 상황에서 언제 어디서나 사용할 수 있고, 생산성 저하와 안전사고 발생까지도 없는 가상현실 훈련시스템이 철강 공정 분야에서 주목받고 있다. 특히, 기존의 시각 피드백과 청각 피드백뿐만 아니라 촉감 피드백까지 제공하는 햅틱 조업 훈련시스템이 조업 훈련에 효과적일 것으로 기대된다. 본 논문에서는 철강 공정에서 햅틱 조업 훈련시스템이 갖는 의미와 더불어 햅틱 조업 훈련시스템의 구성과 교육 컨텐츠에 대해 설명한다.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.45-51
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• 2009

In this paper, a transparency analysis and network-adaptive transport scheme are proposed in order to improve transparency of EBA-based force-reflecting teleoperation. EBA guarantees stability of force-reflecting teleoperation over network delay and loss but has limitation that it cannot overcome transparency deterioration of haptic interactions. The proposed transparency analysis quantifies the force feedback distortion caused by network delay and loss. Based on the analysis, the proposed haptic data synchronization and transmission rate control schemes adapt synchronization delay and transmission rate to current network state for more transparent haptic interaction. Through Matlab/Simulink simulations, it is confirmed that the proposed analysis provides an acceptable quantification method about haptic interaction quality and that the proposed haptic data transport scheme effectively improves haptic interaction quality with respect to network delays and losses.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.661-663
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• 2022

이 논문에서는 변형 가능한 햅틱 컨트롤러와 포스 피드백 장치를 이용한 치과 수술 시뮬레이션 시스템을 제안한다. 이 시스템은 가상 환경에서 매복 사랑니 발치 수술을 수행하도록 설계되었다. 햅틱 하드웨어들은 신체와 수술도구의 상대적 위치를 계산하여 충돌여부를 파악하고 저항감과 진동감을 제공한다. 특히 길이 변화, 굽힘 발생과 같은 변형이 가능한 햅틱 컨트롤러는 사용하는 수술도구에 따라 느껴지는 촉감을 표현할 수 있다. 정교한 3 차원 모델로 구강내부와 치과용 수술도구를 표현한 후 햅틱 컨트롤러의 움직임과 버튼 클릭 등의 입력 값을 전달하는 모듈을 통해 가상 객체와 상호 작용하고 이에 대한 햅틱 피드백을 컨트롤러로 전달하여 사용자에게 현실적인 수술 경험을 제공한다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.44 no.2 s.314
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• pp.37-46
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• 2007

In this paper, we propose technologies for enhancing the immersive realization of virtual objects in AR-based product design. Generally, multimodal senses such as visual/auditory/tactile feedback are well known as a method for enhancing the immersion in case of interaction with virtual objects. By adapting tangible objects we can provide touch sensation to users. A 3D model of the same scale overlays the whole area of the tangible object so the marker area is invisible. This contributes to enhancing immersion. Also, the hand occlusion problem when the virtual objects overlay the user's hands is partially solved, providing more immersive and natural images to users. Finally, multimodal feedback also creates better immersion. In our work, both vibrotactile feedback through page motors, pneumatic tactile feedback, and sound feedback are considered. In our scenario, a game-phone model is selected, by way of proposed augmented vibrotactile feedback, hands occlusion-reduced visual effects and sound feedback are provided to users. These proposed methodologies will contribute to a better immersive realization of the conventional AR system.