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Haptic Tumor Augmentation: Exploring Multi-Point Interaction
Seokhee Jeon,Harders, Matthias IEEE 2014 IEEE transactions on haptics Vol.7 No.4
<P>We currently explore the application of haptic augmentation in the context of palpation training systems. The key idea is to modify real touch sensations with computed haptic feedback. In earlier work, we have introduced an algorithmic framework for determining appropriate augmentation forces during interaction at one contact point. In this paper, we present an extension of the approach to deal with manipulations at more than one contact location. At the heart of our method is the data-driven estimation of Hunt-Crossley model parameters in a pre-computation step. Feeding the parameters into a contact dynamics model allows us to approximate the feedback behavior of various physical tissue mock-ups. Further, we combine the parameter estimation with the tracking of the position of a stiffer inclusion in the mock-up. These data are employed to create a model of movement due to external forces. The combination of these models then allows us to represent and render the mutual effects at multiple contact points. Several experiments have been carried out on a setup with two haptic devices. Comparisons of recorded with simulated interaction data demonstrate the performance and potential of our method.</P>
User-Adaptive Key Click Vibration on Virtual Keyboard
Jeon, Seokhee,Lee, Hongchae,Jung, Jiyoung,Kim, Jin Ryong Hindawi Limited 2018 Mobile information systems Vol.2018 No.-
<P>This study focuses on design of user-adaptive tactile keyboard on mobile device. We are particularly interested in its feasibility of user-adaptive keyboard in mobile environment. Study 1 investigates how tactile feedback intensity of the virtual keyboard in mobile devices affects typing speed and user preference. We report how different levels of feedback intensity affect user preferences in terms of typing speed and accuracy in different user groups with different typing performance. Study 2 investigates different tactile feedback modes (i.e., whether feedback intensity is linearly increased, linearly decreased, or constant from the centroid of the key, and whether tactile feedback is delivered when a key is pressed, released, or both pressed and released). We finally design and implement user-adaptive tactile keyboards on mobile device to explore the design space of our keyboards. We close by discussing the benefits of our design along with its future work.</P>
Haptic Rendering of Curved Surface by Bending an Encountered-Type Flexible Plate
'Institute of Electronics, Information and Communi 2016 IEICE transactions on information and systems Vol.99e.d No.7
<P>An encountered-type haptic interface generates touch sensation only when a user's hand 'encounters' virtual objects. This paper presents an effective encountered-type haptic interface that enables rendering of surfaces with variable curvature. The key idea is to systematically bend a thin elastic plate so as to create a curved surface with desired curvature, which becomes a contacting end effector that follows the user's finger and becomes an interface a user can touch when needed. The pose of the curvature is controlled in a way that it corresponds to the curved surfaces of virtual objects and user's finger position. The idea is realized by attaching two commercial haptic interfaces to both edges of a thin acryl plate and squeezing the plate. This setup allows us to generate a cylindrical object with curvature up to 0.035 mm(-1) and gives 3DOF position control and 1DOF rotational control of the curved surface. Achievable workspace and curvature range are analyzed, and the feasibility and physical performance are demonstrated through a visuo-haptic grabbing scenario. In addition, a psychophysical experiment shows perceptual competence of the proposed system.</P>
바이트 접근성을 가지는 비휘발성 메모리 소자를 이용한 낸드 플래시 파일시스템의 부팅시간 개선 기법
전병길(Byeonggil Jeon),김은기(Eunki Kim),신형종(Hyungjong Shin),한석희(Seokhee Han),원유집(Youjip Won) 한국정보과학회 2008 정보과학회 컴퓨팅의 실제 논문지 Vol.14 No.3
본 연구의 목표는 낸드 플래시 메모리용 파일시스템의 고질적인 문제점인 파일 시스템 마운트 지연시간을 개선하는 것이다. 이를 위하여 바이트 접근성을 가지는비휘발성 랜덤 억세스 메모리 소자와 낸드 플래시로 계층적 저장시스템을 구성하고, 바이트 접근성을 가지는 비휘발성 랜덤 억세스 메모리 소자 상에 파일 시스템 메타 데이타를 위치시키는 기법을 개발하였다. 데이타 무결성을 지원하고, 고속의 랜덤 읽기/쓰기가 가능한 비휘발성 랜덤 억세스 메모리 소자에 메타 데이타를 위치시킴으로써 낸드 플래시에 저장된 메타 데이타를 관리하기 위해 Spare 영역과 Object Header 영역에 구성된 항목가운데 불필요한 항목을 제거할 수 있었다. 또한, Object Header의 자료구조를 효율적으로 설계하여 이전 연구인 FRASH1.0에서 파일 생성/삭제 성능 저하를 초래한 Object Header를 스캔하는 단계를 제거하였다. 최적화된 비휘발성 랜덤 억세스 메모리 소자의 자료구조와 개발된 알고리즘을 실제 파일 시스템으로 구현한 FRASH1.5를 개발하였다. 이것을 채용한 FRASH1.5의 성능을 평가한 결과 마운트 동작 시간은 이전 연구인 FRASH1.0 대비 2배 이상 단축시킬 수 있었고, 파일 생성성능은 FRASH1.0 대비 3~8% 향상되었다. 특히, 파일 크기가 크고, 개수가 많을 경우는 기존 YAFFS 대비 성능저하 없이 마운트 시간을 8배 이상 감소시킬 수 있었다. This paper describes an improvement of mount-time delay in NAND Flash file systems. To improve file system mount performance, this work configures a hierarchical storage system with byte-addressable NVRAM and NAND Flash memory, and let the meta data of a file system allocated in the NVRAM. Since the meta data are stored in NVRAM supporting data integrity, some of the items, which are stored in Spare area and Object Header area of NAND Flash memory to control meta data of NAND Flash file system, could be eliminated. And also, this work eliminates the scanning operation of the Object Header area of previous work FRASH1.0. The scanning operation is definitely required to find out the empty Object Header address for storing the Object Header data and provokes a certain amount of performance loss in file generation and deletion. In this work, an implemented file system, so-called FRASH1.5, is demonstrated, featuring new data structures and new algorithms. The mount time of FRASH1.5 becomes twice as fast as that of the FRASH1.0. The performance in file generation gets improved by about 3~8%. In particular, for most large-size files, the FRASH1.5 has 8 times faster mount time than YAFFS, without any performance loss as seen in the file generation.