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김기민(Kimin Kim),김재일(Jaeil Kim),김석열(Seokyeol Kim),박진아(Jinah Park) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2
본 연구에서는 다양한 형태의 쌍방향 인터페이스를 이용한 체감형 인체 구조 학습 시스템에 대해 논의하고 이를 구현하기 위한 프레임워크를 제안한다. 기존에 제시된 인체 구조 학습 시스템은 주로 시각적 정보에 의지한 한정적인 범위의 단방향 학습 시스템이었다. 우리는 실제 인체로부터 획득한 3차원 장기 모델을 활용하여 학습자에게 보다 사실적인 시각적 정보를 전달하고, 햅틱 기술과 증강 현실 기술을 결합함으로써 기존의 제한적인 인터페이스로는 실현할 수 없었던 다양한 상호 작용들을 가능케 하는 데 목표를 두고 있다. 이를 통해 기존 과학 학습 보조 자료들이 가지는 한계를 극복하고 나아가 현실과 가상 교육 환경 간의 유기적인 융합 방안을 모색한다. This research suggests the framework for human body learning system using various forms of bidirectional interfaces. The existing systems mostly use the limited and unidirectional methods which are merely focused on the visual information. Our system provides more realistic visual information using 3D organ models from the real human body. Also we combine the haptic and augmented reality techniques into our system for wider range of interaction means. Through this research, we aim to overcome the limitation of existing science education systems and explore the effective scheme to fuse the real and virtual educational environment into one.
Volume-based Haptic Model for Bone-drilling
Kimin Kim,Ye-Seul Park,Jinah Park 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
For bone surgery haptic simulation, we need to consider both volume cutting deformation and stable force feedback. In this paper, we propose a volume-based haptic model where both bone and a tool are represented by voxel-based models so that we can handle shape deformation of bone efficiently. For fast and stable haptic rendering, we propose that the tool is represented by a signed-distance field and the bone surface is tracked by a set of points, called a point shell. In order to handle shape deformation of bone while drilling, fast reconstruction of point shell points are performed locally based on the voxel properties of bone and the tool.
Kim, Kimin,Choe, W.,In, Y.,Ko, W.H.,Choi, M.J.,Bak, J.G.,Kim, H.S.,Jeon, Y.M.,Kwak, J.G.,Yoon, S.W.,Oh, Y.K.,Park, J.-K. International Atomic Energy Agency 2017 Nuclear fusion Vol.57 No.12
<P>Toroidal rotation braking by neoclassical toroidal viscosity driven by non-axisymmetric (3D) magnetic fields, called magnetic braking, has great potential to control rotation profile, and thereby modify tokamak stability and performance. In order to characterize magnetic braking in the various 3D field configurations, dedicated experiments have been carried out in KSTAR, applying a variety of static <img ALIGN='MIDDLE' ALT='$n=1$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn003.gif'/>, 3D fields of different phasing of <img ALIGN='MIDDLE' ALT='$-90$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn004.gif'/>, 0, and <img ALIGN='MIDDLE' ALT='$+90$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn005.gif'/>. Resonant-type magnetic braking was achieved by <img ALIGN='MIDDLE' ALT='$-90$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn006.gif'/> phasing fields, accompanied by strong density pump-out and confinement degradation, and explained by excitation of kink response captured by ideal plasma response calculation. Strong resonant plasma response was also observed under <img ALIGN='MIDDLE' ALT='$+90$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn007.gif'/> phasing at <img ALIGN='MIDDLE' ALT='$q_{95} \sim 6$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn008.gif'/>, leading to severe confinement degradation and eventual disruption by locked modes. Such a strong resonant transport was substantially modified to non-resonant-type transport at higher <img ALIGN='MIDDLE' ALT='$q_{95} \sim 7.2$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn009.gif'/>, as the resonant particle transport was significantly reduced and the rotation braking was pushed to plasma edge. This is well explained by ideal perturbed equilibrium calculations indicating the strong kink coupling at lower <img ALIGN='MIDDLE' ALT='$q_{95}$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn010.gif'/> is reduced at higher <img ALIGN='MIDDLE' ALT='$q_{95}$ ' SRC='http://ej.iop.org/images/0029-5515/57/12/126035/nfaa8382ieqn011.gif'/> discharge. The 0 phasing fields achieved quiescent magnetic braking without density pump-out and confinement degradation, which is consistent with vacuum and ideal plasma response analysis predicting deeply penetrating 3D fields without an excitation of strong kink response.</P>
Voxel-based Haptic Rendering using Adaptive Sampling of a Local Distance Map
Kimin Kim,Jinah Park 한국정보과학회 2019 Journal of Computing Science and Engineering Vol.13 No.2
Change of shape is an essential topic in research related to virtual reality-based sculpting, mechanical machining, and surgery training of tissue cutting. If the shape of an object in the virtual environment is modified at high temporal rates, it is very difficult to resolve contacts between objects due to the fact that the existing haptic rendering algorithm depends on expensive preprocessing strategies such as bounding volumes, bounding volume hierarchies, and distance fields. This paper investigates a haptic rendering algorithm in virtual environments with shape changes. We introduce a volumetric collision model and an on-the-fly contact normal computation method with a local distance map, which allow for shape changes of the volume model at time-critical haptic rendering. This approach significantly reduces the voxel readout, which allows the model to handle more than ten thousand voxels at haptic rates. The real-time tooth probing and cutting simulation results support the benefits of our approach.
Kim, Jeum-Jong,Choi, Hyunbong,Paek, Sanghyun,Kim, Chulwoo,Lim, Kimin,Ju, Myung-Jong,Kang, Hong Seok,Kang, Moon-Sung,Ko, Jaejung American Chemical Society 2011 Inorganic chemistry Vol.50 No.22
<P>A new class of cyclometalated ruthenium sensitizers incorporating a ĈN̂N ligand and conjugated 2,2′-bipyridine in the ancillary ligand have been designed and synthesized. The photovoltaic performance of <B>JK-206</B> using an electrolyte containing 0.6 M 1,2-dimethyl-3-propylimidazolium iodide, 0.05 M I<SUB>2</SUB>, 0.1 M LiI, and 0.5 M <I>tert</I>-butylpyridine in CH<SUB>3</SUB>CN gave a short-circuit photocurrent density of 19.63 mA cm<SUP>–2</SUP>, an open-circuit voltage of 0.74 V, and a fill factor of 0.72, affording an overall conversion efficiency of 10.39%. The efficiency is the highest one reported for dye-sensitized solar cells based on the cyclometalated ruthenium sensitizer of the type ĈN̂N. Moreover, the same device using a polymer gel electrolyte exhibited a remarkable stability under 1000 h of light soaking at 60 °C, retaining 91% of the initial efficiency of 7.14%.</P><P>A new class of cyclometalated ruthenium sensitizers incorporating a ĈN̂N ligand and conjugated 2,2′-bipyridine in the ancillary ligand have been designed and synthesized. The high efficiency and excellent stability may be attributed to the intrinsic stability of the cyclometalated ruthenium complex with a ĈN̂N ligand and the broad and red-shifted absorption property of the cyclometalated complex.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2011/inocaj.2011.50.issue-22/ic200872a/production/images/medium/ic-2011-00872a_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic200872a'>ACS Electronic Supporting Info</A></P>
Kim, Kimin,Yang, Sung-Byung The Korea Contents Association 2014 International Journal of Contents Vol.10 No.3
Participants in Open Source Software (OSS) development projects usually contribute voluntarily without expecting direct compensation for their work. One of the central puzzles raised by the success of OSS is the motivation of the participants; why top-notch programmers choose to write software that is released for no fee. In order to respond to this peculiarity employing a meta-research method, we first identify and review theoretical perspectives from diverse disciplines including economics, sociology, political science, anthropology, psychology, and management. Then, we suggest a comprehensive framework that provides a holistic understanding of the puzzle in question. Reviewing key empirical studies based on the suggested framework, we also suggest a future research agenda.