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Kyung-Min Lim

Bio: Kyung-Min Lim is an academic researcher from Samsung. The author has contributed to research in topics: Image processing & Laser scanning. The author has an hindex of 5, co-authored 10 publications receiving 51 citations.

Papers
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Journal ArticleDOI
Kyung-Min Lim1, Lee Jaesung1, Won Kwang-Hyun1, Nupur Kala, Tammy Lee1 
TL;DR: The optimal FOV range was determined by experimentally validating a minimum FOV that can effectively reduce VR sickness with almost negligible loss in presence, and simulation results show a significant decrease compared to full FOV viewing.
Abstract: In this paper, we proposed a novel method for virtual reality (VR) sickness reduction based on dynamic field of view (FOV) processing. Dynamic FOV processing is performed based on the estimated VR sickness for each video frame. The level of sickness is estimated using VR sickness model, which is obtained by defining the relationship between the motion information and the measured VR sickness. For motion information analysis, subregion-based correspondence points tracking is used to efficiently remove outliers and prevent prediction error propagation. Amount of head dispersion is used as a quantitative VR sickness measure, which can be calculated from inertial measurement unit sensor in VR devices. The optimal FOV range was determined by experimentally validating a minimum FOV that can effectively reduce VR sickness with almost negligible loss in presence. The simulation results show a significant decrease of 37% compared to full FOV viewing, when FOV is dynamically varied between full and 60°.

16 citations

Patent
Kyung-Min Lim1
15 Feb 2007
TL;DR: In this article, a laser scanning apparatus capable of preventing a secondary contamination of light transmitting windows and an image forming device having the same include a light emitting unit to emit light, a cover connected to a laser scanner body, and having at least one light transmitting window through which light passes, a cleaning member reciprocally disposed on the cover to clean the light transmission window when on a cleaning path, and a guide unit to guide a movement of the cleaning member.
Abstract: A laser scanning apparatus capable of preventing a secondary contamination of light transmitting windows and an image forming device having the same include a light emitting unit to emit light, a cover connected to a laser scanning apparatus body, and having at least one light transmitting window through which light passes, a cleaning member reciprocally disposed on the cover to clean the light transmitting window when on a cleaning path, and a guide unit to guide a movement of the cleaning member, so that the cleaning path is other than a returning path of the cleaning member and have different up and down periods from each other.

12 citations

Patent
Kyung-Min Lim1
14 Jan 2008
TL;DR: In this paper, a light scanning module mounted to a main body, including a cleaning shutter part, is coupled to the main body to move between an opening position and a closing position to close the light scanning window.
Abstract: A light scanning module mounted to a main body, the module including a light scanning unit including a light scanning window to scan a light onto a photosensitive body of the main body, a cleaning shutter part including a cleaning part to clean the light scanning window and is coupled to the main body to move between an opening position to open the light scanning window and a closing position to close the light scanning window, and the cleaning shutter part, including a cleaning part accommodating part to accommodate at least one area of the cleaning part to pivotally rotate, and a rotation regulating part provided on one side of the cleaning part and is contact-supported on an internal wall of the cleaning part accommodating part to block the pivotal rotation of the cleaning part if the cleaning shutter part moves from the closing position to the opening position, and is separated from the internal wall of the cleaning part accommodating part to permit the pivotal rotation of the cleaning part if the cleaning shutter part moves from the opening position to the closing position.

9 citations

Patent
Kyung-Min Lim1
18 Jan 2007
TL;DR: In this article, a polygon mirror deflects and scans the light emitted from the light source, and a driving motor drives and rotates the polygon mirrors. But the authors did not consider the effect of the driving motor on the heat dissipation characteristic of heating dissipation components.
Abstract: A laser scanning unit scans a light beam onto a photoconductor to form a latent image. The laser scanning unit includes a light source that generates and radiates a light. A polygon mirror deflects and scans the light emitted from the light source. A driving motor drives and rotates the polygon mirror. A circuit substrate has a first surface on which the polygon mirror and the driving motor are coaxially mounted. A housing, to which the circuit substrate is coupled, includes an opening through which the polygon mirror is introduced in the inner space. A second surface of the circuit substrate to the opposite side of the polygon mirror is entirely exposed to the outside to function as a heat radiation surface. Thus, the heat dissipation characteristic of heating dissipation components, including a driving motor, is improved and the inner sealing of the laser scanning unit is secured.

7 citations


Cited by
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Journal ArticleDOI
TL;DR: Light is shed on the effects of 5G on the Internet's core, i.e., on the internet interdomain traffic, and it is concluded that the traffic for the use case groups Video in 5G, Health, and Virtual & Augmented Reality will have the largest impact.

36 citations

Journal ArticleDOI
TL;DR: In this article , the authors present an integrated survey connecting the findings from previous review papers and the state of the art involving empirical studies and participants, focusing on the practical studies of different contributing factors, the pros and cons of measurements, profiles of cybersickness, and solutions to reduce this phenomenon.
Abstract: Abstract Cybersickness still poses a significant challenge to the widespread usage of virtual reality, leading to different levels of discomfort and potentially breaking the immersive experience. Researchers have attempted to discover the possible fundamental causes of cybersickness for years. Despite the longstanding interest in the research field, inconsistent results have been drawn on the contributing factors and solutions to combating cybersickness. Moreover, little attention has been paid to individual susceptibility. A consolidated explanation remains under development, requiring more empirical studies with robust and reproducible methodologies. This review presents an integrated survey connecting the findings from previous review papers and the state of the art involving empirical studies and participants. A literature review is then presented, focusing on the practical studies of different contributing factors, the pros and cons of measurements, profiles of cybersickness, and solutions to reduce this phenomenon. Our findings suggest a lack of considerations regarding user susceptibility and gender balance in between groups studies. In addition, incongruities among empirical findings raised concerns. We conclude by suggesting points of insights for future empirical investigations.

29 citations

Journal ArticleDOI
Kyung-Min Lim1, Lee Jaesung1, Won Kwang-Hyun1, Nupur Kala, Tammy Lee1 
TL;DR: The optimal FOV range was determined by experimentally validating a minimum FOV that can effectively reduce VR sickness with almost negligible loss in presence, and simulation results show a significant decrease compared to full FOV viewing.
Abstract: In this paper, we proposed a novel method for virtual reality (VR) sickness reduction based on dynamic field of view (FOV) processing. Dynamic FOV processing is performed based on the estimated VR sickness for each video frame. The level of sickness is estimated using VR sickness model, which is obtained by defining the relationship between the motion information and the measured VR sickness. For motion information analysis, subregion-based correspondence points tracking is used to efficiently remove outliers and prevent prediction error propagation. Amount of head dispersion is used as a quantitative VR sickness measure, which can be calculated from inertial measurement unit sensor in VR devices. The optimal FOV range was determined by experimentally validating a minimum FOV that can effectively reduce VR sickness with almost negligible loss in presence. The simulation results show a significant decrease of 37% compared to full FOV viewing, when FOV is dynamically varied between full and 60°.

16 citations

Proceedings ArticleDOI
01 Oct 2018
TL;DR: An exploratory study comparing and combining techniques (independent visual background and restricted field of view) in 360° video that provides constructive insights for VR designers, while also exploring how analytics of VR content and user experience can be used for VIMS prevention and evaluation.
Abstract: As head mounted displays (HMDs) become everyday consumer items, the potential of immersive Virtual Reality (VR) as a design space becomes ever more promising. However, their usage is impeded by human factors inherent to the technology itself, such as visually induced motion sickness (VIMS), caused by the disconnect between what is visually and physically perceived. Previous work on VIMS reduction has explored techniques targeting HMDs, while others explored techniques that target the multimedia content itself through visual optimization. The latter are often studied individually and cannot be applied to certain VR content such as 360° video. Consequently, this paper describes an exploratory study comparing and combining such techniques (independent visual background and restricted field of view) in 360° video. The work provides constructive insights for VR designers, while also exploring how analytics of VR content and user experience can be used for VIMS prevention and evaluation.

16 citations

Journal ArticleDOI
Se-Hoon Kim1, Seung-Heon Lee1, Nupur Kala1, Lee Jaesung1, Won-Hee Choe1 
TL;DR: Experimental result shows that the proposed method reduces VR sickness by 31.4%.

14 citations