Data-Driven Haptic Modeling and Rendering of Viscoelastic and Frictional Responses of Deformable Objects

Yim, Sunghoon,Jeon, Seokhee,Choi, Seungmoon IEEE 2016 IEEE transactions on haptics Vol.9 No.4

<P>In this paper, we present an extended data-driven haptic rendering method capable of reproducing force responses during pushing and sliding interaction on a large surface area. The main part of the approach is a novel input variable set for the training of an interpolation model, which incorporates the position of a proxy - an imaginary contact point on the undeformed surface. This allows us to estimate friction in both sliding and sticking states in a unified framework. Estimating the proxy position is done in real-time based on simulation using a sliding yield surface - a surface defining a border between the sliding and sticking regions in the external force space. During modeling, the sliding yield surface is first identified via an automated palpation procedure. Then, through manual palpation on a target surface, input data and resultant force data are acquired. The data are used to build a radial basis interpolation model. During rendering, this input-output mapping interpolation model is used to estimate force responses in real-time in accordance with the interaction input. Physical performance evaluation demonstrates that our approach achieves reasonably high estimation accuracy. A user study also shows plausible perceptual realism under diverse and extensive exploration.</P>

Topography Compensation for Haptization of a Mesh Object and Its Stiffness Distribution

Sunghoon Yim,Seokhee Jeon,Seungmoon Choi IEEE 2015 IEEE transactions on haptics Vol.8 No.1

<P>This work was motivated by the need for perceptualizing nano-scale scientific data, e.g., those acquired by a scanning probe microscope, where collocated topography and stiffness distribution of a surface can be measured. Previous research showed that when the topography of a surface with spatially varying stiffness is rendered using the conventional penalty-based haptic rendering method, the topography perceived by the user could be significantly distorted from its original model. In the worst case, a higher region with a smaller stiffness value can be perceived to be lower than a lower region with a larger stiffness value. This problem was explained by the theory of force constancy: the user tends to maintain an invariant contact force when s/he strokes the surface to perceive its topography. In this paper, we present a haptization algorithm that can render the shape of a mesh surface and its stiffness distribution with high perceptual accuracy. Our algorithm adaptively changes the surface topography on the basis of the force constancy theory to deliver adequate shape information to the user while preserving the stiffness perception. We also evaluated the performance of the proposed haptization algorithm in comparison to the constraint-based algorithm by examining relevant proximal stimuli and carrying out a user experiment. Results demonstrated that our algorithm could improve the perceptual accuracy of shape and reduce the exploration time, thereby leading to more accurate and efficient haptization.</P>

모바일 장치에서의 이미지 브라우징을 위한 동작 추적 기반 인터페이스의 설계 및 평가

임성훈(Sunghoon Yim),최승문(Seungmoon Choi) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2

이 논문에서, 모바일 장치에서의 이미지 브라우징을 위한 모션 기반 상호 작용 방식의 가능성을 평가하였다. 이를 위해 모션을 기반으로 한 인터페이스와 상호작용 방법을 디자인 하였다. 디자인된 인터페이스를 평가하기 위해 이를 현재 모바일 장치에서 사용 가능한, 가속도계와 비전을 이용한 하드웨어와 고성능의 트랙커를 이용한 하드웨어로 구현하여 버튼 인터페이스와 비교 실험을 하였다. 그 결과 모션 인터페이스들의 경우 버튼 인터페이스에 비해, 사용자의 흥미를 유발할 수 있었고, 충분한 훈련을 거치면 사용성 및 사용자 성능의 증대효과도 컸지만 버튼 인터페이스의 성능에는 미치지 못하였다. In this paper, we evaluate the feasibility of a motion-based interaction for image browsing in the mobile device. We present the design of a motion-based interface and a navigation scheme. A designed interaction scheme was evaluated in a usability experiment alongside the conventional button-based interaction for image browsing. After enough training of user, the usability and the user task performance of the motion based interaction were significantly increased, approaching those of the button based interaction.

햅틱 인터페이스와 힘 센서를 이용한 연성 실제 물체의 형태 모델링

임성훈(Sunghoon Yim),최승문(Seungmoon Choi) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1

본 논문은 힘 센서가 설치된 일반적인 힘 반영 햅틱인터페이스를 이용하여 연성의 실제물체의 형태 모델을 만들어 내는 방법을 제시한다. 사용자가 실제 물체의 표면을 두드려서 표면의 접촉 점을 얻어낸 뒤 이 점들을 기존의 표면 재구성 알고리즘을 이용하여 물체표면으로 변환한다. 이를 위해 충돌을 확인하고 정확한 충돌 지점을 찾아내는 알고리즘을 개발하였다. We introduce a shape modeling system for soft, deformable real objects, which uses a force-feedback haptic interface and a force sensor. The user taps on the surface of an object to collect contact points and the collected points are used for surface reconstruction. We propose a contact detection method and an algorithm to estimate the contact point.

다중 정보의 햅틱화

임성훈(Sunghoon Yim),최승문(Seungmoon Choi) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2

햅틱화는 정보 가시화에 대응하는 햅틱스의 한 분야로, 주어진 정보를 사용자의 촉각을 통해, 효과적으로 전달하는 것을 주 목적으로 한다. 특히 다양한 정보를 동시에 제공할 경우, 햅틱화의 방법의 문제나, 사용자의 인지 능력의 문제로, 정보의 왜곡 및 전달 실패가 있을 수 있다. 이를 해결하기 위해서는, 정신 물리학적 방법론을 사용하여 사용자의 정보 인지방법에 대해 알아내고 이를 바탕으로 하여 다양한 정보가 영향을 미치거나 왜곡 시키지 않도록 하는 정보 전달 방법을 개발해야 한다. 우리는 기존의 물체의 형태/경도 렌더링을 정보 햅틱화를 적용할 때의 문제를 해결하기 위한 알고리즘을 개발하고, 현재, 이 알고리즘을 다양한 자료 구조에 적용하기 위한 연구를 진행하고 있다. 더 나아가 형태/경도 렌더링에 더하여, 제동/마찰 등의 더 다양한 햅틱 요소를 적용할 수 있도록 알고리즘을 확장하고자 한다. Haptization is delivering the properties of a data set to the user through the haptic sensory channels. When multidimensional information is imparted to the user, unexpected interactions between haptic attributes can cause the perceived information by the user to be distorted from what is contained in the original data set. Such possibility must be carefully considered in designing haptization methods. Previously, we developed a haptic rendering algorithm for the simultaneous presentation of object shape and stiffness for data haptization. In this research, we extend the algorithm to be applicable to several common data structures. We then shift our attention to the haptization of other haptic attributes including friction and damping.

모바일 장치를 위한 동작 추적형 이미지 브라우징 시스템

임성훈(Sunghoon Yim),황재인(Jane Hwang),최승문(Seungmoon Choi),김정현(Gerard Jounghyun Kim) 한국HCI학회 2007 한국HCI학회 학술대회 Vol.2007 No.2

Long Non-coding RNA <i>HOXA11</i> Antisense Promotes Cell Proliferation and Invasion and Predicts Patient Prognosis in Serous Ovarian Cancer

Yim, Ga Won,Kim, Hee Jung,Kim, Lee Kyung,Kim, Sang Wun,Kim, Sunghoon,Nam, Eun Ji,Kim, Young Tae Korean Cancer Association 2017 Cancer Research and Treatment Vol.49 No.3

<P><B>Purpose</B></P><P>The biological function of long non-coding RNAs (lncRNAs) is only partially understood; therefore, in this study, we investigated the expression of the novel <I>HOXA11</I> antisense (<I>HOXA11as</I>) lncRNA and its oncogenic role in serous ovarian cancer (SOC).</P><P><B>Materials and Methods</B></P><P><I>HOXA11as</I> expression was examined in 129 SOC tissue samples by real time reverse transcription polymerase chain reaction. Clinicopathological factors and patient survival were compared between the high (n=27) and low <I>HOXA11as</I> expression group (n=102). To investigate the role of <I>HOXA11as</I> in cell proliferation, invasion, and migration, <I>HOXA11as</I> expression in ovarian cancer cells was knocked down using RNA interference.</P><P><B>Results</B></P><P><I>HOXA11as</I> expression in cancer tissue was 77-fold higher than that of noncancerous tissue (p < 0.05). Higher <I>HOXA11as</I> expression was significantly correlated with histological grade (p=0.017) and preoperative cancer antigen 125 (p=0.048). <I>HOXA11as</I> overexpression in SOC cells led to increased cell proliferation, invasion, and migration. Moreover, <I>HOXA11as</I> was associated with the expression of genes involved in cell invasion, migration, and epithelial-mesenchymal transition (EMT), including vascular endothelial growth factor, matrix metalloproteinase 9 (MMP-9), B-catenin, E-cadherin, Snail, Twist, and vimentin. Multivariate analysis revealed that <I>HOXA11as</I> was a prognostic factor of progressive disease and mortality (hazard ratio [HR], 1.730; p=0.043 and HR, 2.170; p=0.033, respectively). Progression-free and overall survival were significantly shorter in patients with high <I>HOXA11as</I> expression.</P><P><B>Conclusion</B></P><P>These findings highlight the clinical significance of <I>HOXA11as</I> to predicting the prognosis of SOC patients and suggest its potential in promoting tumor aggressiveness via regulation of vascular endothelial growth factor (VEGF), MMP-9, and EMT-related mechanisms.</P>

테더를 포함한 에어백 모델 생성 프로그램 개발

양성훈(Sunghoon Yang),김은영(Eunyoung Kim),임종현(Jonghyun Yim),채수원(Soo-Won Chae) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11

다구찌 기법을 이용한 조수석 에어백 형상설계연구

양성훈(Sunghoon Yang),임종현(Jonghyun Yim),김승기(Seungki Kim),채수원(Soo-Won Chae) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11

Oligomerization of Dicyclopentadiene Over Nanoporous Al-KIT-6 Catalysts

Hong, Sunghoon,You, Yongin,Yim, Jin-Heong,Han, Jeongsik,Jeong, Byung-Hun,Jeon, Jong-Ki American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11

<P>The effect of Al incorporation over KIT-6 on the catalytic performance in dicyclopentadiene oligomerization reaction has been investigated. Al-KIT-6 was prepared through a post alumination method using KIT-6. The Al-KIT-6 prepared through Al grafting over KIT-6 was shown to have a well-arranged mesoporous structure, a large surface area, and a large pore size. Grafting of Al on KIT-6 generated Lewis acid sites with weak strength. The TCPD yield over the Al-KIT-6 catalysts was higher than that over KIT-6 during DCPD oligomerization and TCPD isomerization. It might be attributed to the higher number of acid sites in the Al-KIT-6 catalyst. In addition, higher endo-DCPD conversion and higher TCPD isomerization selectivity can be achieved by using Al-KIT-6 as compared with Al-MCM-41, likely due to the three-dimensional mesopores and larger pore diameters of the KIT-6 aluminosilicates.</P>