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A steering model for on-line locomotion synthesis
Kwon, Taesoo,Shin, Sung Yong John Wiley Sons, Ltd. 2007 Computer Animation and Virtual Worlds (Print) Vol.18 No.4-5
<P>For applications such as video games and virtual walk-throughs, on-line locomotion control is an important issue. In general, the user prescribes a sequence of motions one by one while providing an input trajectory. Since the input trajectory lacks in human characteristics, one may not synthesize quality motions by blindly following it. In this paper, we present a novel data-driven scheme for transforming a user-prescribed trajectory to a human trajectory in an on-line manner. As preprocessing, we analyze example motion data to extract human steering behavior. At run-time, the input trajectory is refined to reflect the steering behavior. Together with an existing on-line motion synthesis system, our scheme forms a feedback loop, in which the user effectively specifies an intended human trajectory. Copyright © 2007 John Wiley & Sons, Ltd.</P>
Spatial Performance Analysis and Design Principles for Wireless Peer Discovery
Taesoo Kwon,Ji-Woong Choi IEEE 2014 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.13 No.8
<P>In wireless peer-to-peer networks that serve various proximity-based applications, peer discovery is the key to identifying other peers with which a peer can communicate and an understanding of its performance is fundamental to the design of an efficient discovery operation. This paper analyzes the performance of wireless peer discovery through comprehensively considering the wireless channel, spatial distribution of peers, and discovery operation parameters. The average numbers of successfully discovered peers are expressed in closed forms for two widely used channel models, i.e, the interference limited Nakagami-m fading model and the Rayleigh fading model with nonzero noise, when peers are spatially distributed according to a homogeneous Poisson point process. These insightful expressions lead to the design principles for the key operation parameters including the transmission probability, required amount of wireless resources, level of modulation and coding scheme (MCS), and transmit power. Furthermore, the impact of shadowing on the spatial performance and suggested design principles is evaluated using mathematical analysis and simulations.</P>
Multi-Group Random Access Resource Allocation for M2M Devices in Multicell Systems
Taesoo Kwon,Ji-Woong Choi IEEE 2012 IEEE communications letters Vol.16 No.6
<P>The efficient service of a tremendous number of machine-type devices with heterogeneous traffic types may consider simple random access as a solution. For more rigorous analysis of system performance in multicell environments, it is required to consider not only the packet collisions within the same cell but also the interference from other cells. This letter analyzes signal-to-interference-ratio distributions and derives efficient resource allocation schemes for spatial multi-group random access in multicell systems, using the Poisson point process model.</P>
Hybrid Duplex Wireless Peer Discovery With Imperfect Self-Interference Cancellation
Kwon, Taesoo,Lee, Hyeonwoo IEEE 2018 IEEE communications letters Vol.22 No.3
<P>This letter investigates the hybrid duplex wireless peer discovery (Hyb-WPD) that increases the average number of discovered peers (ADP), through arbitrating between half duplex and full duplex (FD) operations. FD allowing simultaneous tranceiving inherently introduces residual self-interference (RSI) due to non-ideal implementation; thus, this impairment yields a new design issue for transmission probability, which determines whether a peer receives or tranceives. This letter proposes the design principles for the Hyb-WPD depending on RSI through mathematically analyzing the ADP, and the numerical results demonstrate their performance.</P>
Broadcast Range Performances for Random Access-Based Wireless Mutual Broadcast
Kwon, Taesoo,Lee, HyeonWoo IEEE 2018 IEEE communications letters Vol.22 No.10
<P>The wireless mutual broadcast (WMB) sharing informative data among proximal nodes has been recently spotlighted as a key enabler for smarter and safer society. These WMB applications may require different intended broadcast coverage (BC) depending on their attributes, and this coverage is profoundly affected by mutual interference among nodes. In this regard, this letter investigates the BC in terms of the proximity between nodes [so called the broadcast range (BR)] under a stochastic geometry framework. Furthermore, it proposes the design principles to improve the performances for an intended BR.</P>
Two-Character Motion Analysis and Synthesis
Taesoo Kwon,Young-Sang Cho,Sang Il Park,Sung Yong Shin IEEE 2008 IEEE transactions on visualization and computer gr Vol.14 No.3
<P>In this paper, we deal with the problem of synthesizing novel motions of standing-up martial arts such as kickboxing, karate, and taekwondo performed by a pair of humanlike characters while reflecting their interactions. Adopting an example-based paradigm, we address three nontrivial issues embedded in this problem: motion modeling, interaction modeling, and motion synthesis. For the first issue, we present a semiautomatic motion-labeling scheme based on force-based motion segmentation and learning-based action classification. We also construct a pair of motion transition graphs, each of which represents an individual motion stream. For the second issue, we propose a scheme for capturing the interactions between two players. A dynamic Bayesian network is adopted to build a motion transition model on top of the coupled motion transition graph that is constructed from an example motion stream. For the last issue, we provide a scheme for synthesizing a novel sequence of coupled motions, guided by the motion transition model. Although the focus of the present work is on martial arts, we believe that the framework of the proposed approach can be conveyed to other two-player motions as well.</P>
Taesoo Kwon,Dong-Ho Cho IEEE 2009 IEEE Transactions on Vehicular Technology VT Vol.58 No.6
<P>In general, link-adaptive schemes, such as adaptive modulation and coding (AMC) and hybrid automatic repeat request (HARQ), enhance system capacity in time-varying wireless channels. For these link-adaptive schemes to be applied, resources have to be adaptively and dynamically allocated every frame. Thus, the system needs control messages to send information to users about dynamic resource allocation. Such information includes user ID, resource position, level of modulation, and coding and automatic repeat request (ARQ) information. However, the transmission of these resource-allocation messages causes control overhead. In this paper, we introduce a scheme that applies AMC to the transmission of resource-allocation messages and analyze its performance in systems that support truncated ARQ, such as link-layer ARQ and HARQ. In addition, we show that using AMC to transmit control messages is a good way to reduce control overhead; in particular, it is very effective when the number of users per frame is large, as in voice over Internet Protocol (VoIP) services.</P>
AMC-Based Transmission of Resource Allocation Messages for Short-Sized Packet Services
Taesoo Kwon,Dong-Ho Cho IEEE 2007 IEEE COMMUNICATIONS LETTERS Vol.11 No.7
<P>We introduce a scheme that applies adaptive modulation and coding (AMC) to the transmission of resource allocation messages, and show that the AMC transmission of control messages reduces control overhead and is particularly effective for services with small-sized packets, such as VoIP.</P>