https://pubs.kist.re.kr/handle/123456789/75385 Sat, 18 Apr 2026 21:52:16 GMT 2026-04-18T21:52:16Z https://pubs.kist.re.kr/handle/201004/116755 Title: Color region tracking against brightness changes Authors: Jeong, Mun-Ho; You, Bum-Jae; Lee, Wang-Heon Abstract: This pater describes a new method for real-time and robust object tracking using a Gaussian-cylindroid color model and an adaptive mean shift. Color information has been widely used for characterizing an object from others. However, sensitiveness to illumination changes limits their flexibility and applicability under various illuminating conditions. We present a robust color model against irregular illumination changes where chrominance is fitted with respect to intensity using B-spline. A target for tracking is expressed by the joint probabilistic density function of the proposed color model and 2-D positional information in image lattice. And tracking is performed using the mean-shift algorithm incorporating the joint probabilistic density function where the bandwidth selection is essential to tracking performance. We present a simple and effective method to find the optimal bandwidth that maximizes the lower bound of the log-likelihood of the target represented by the joint probabilistic density function. The robustness and capability of the presented method are demonstrated for several image sequences. Sun, 01 Jan 2006 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/116755 2006-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/116756 Title: An evaluation of an augmented reality multimodal interface using speech and paddle gestures Authors: Irawati, Sylvia; Green, Scott; Billinghurst, Mark; Duenser, Andreas; Ko, Heedong Abstract: This paper discusses an evaluation of an augmented reality (AR) multimodal interface that uses combined speech and paddle gestures for interaction with virtual objects in the real world. We briefly describe our AR multimodal interface architecture and multimodal fusion strategies that are based on the combination of time-based and domain semantics. Then, we present the results from a user study comparing using multimodal input to using gesture input alone. The results show that a combination of speech and paddle gestures improves the efficiency of user interaction. Finally, we describe some design recommendations for developing other multimodal AR interfaces. Sun, 01 Jan 2006 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/116756 2006-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/116754 Title: Direct electrical characteristics of GaN nanowire field effect transistor (FET) without assistance of E-beam lithography (EBL) Authors: Lee, Sang-Kwon; Seong, Han-Kyu; Choi, Ki-Chul; Cho, Narn-Kyu; Choi, Heon-Jin; Suh, Eun-Kyung; Nahm, Kee-Suk Abstract: We report on simple techniques for extracting the electrical properties of 1-dimensional semiconductor nanowires using standard ultraviolet (UV) photo-lithography instead of e-beam lithography (EBL), which is a commonly used technique for the fabrication of nanoscale electrical devices. For electrical transport measurement the gallium nitride nanowires (GaN NWs) were prepared by a horizontal hot-wall chemical vapor deposition (CVD) with metallic Ga and NH3 gas for Ga and N sources, and GaN nanowire field effect transistor (FET) structures on a 8 x 8 mm(2) silicon wafer were fabricated by ordinary 2-mask photo-lithography processes. The estimated carrier mobility from the gate-modulation characteristics is on the order of 60 similar to 70 cm(2)/(VS)-S-.. We found that our approach is a powerful and simple technique to extract the electrical properties of semiconductor nanowires. The material characteristics of GaN nanowires are also discussed. Sun, 01 Jan 2006 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/116754 2006-01-01T00:00:00Z https://pubs.kist.re.kr/handle/201004/116753 Title: A life assessment for steam turbine rotor subjected to thermo-mechanical loading using inelastic analysis Authors: Choi, W. S.; Fleury, E.; Song, G. W.; Hyun, J. S. Abstract: An important characteristic of a steam power plant is its ability to maintain reliability and safety of the plant against frequent start-ups and load changes. Transient regimes arising during start-ups, shut-downs and load changes give rise to unsteady temperature distribution with time in steam turbine rotor(HP/IP), which results in non-uniform strain and stress distribution. The rapid increase of temperature and rotational speed during starts-ups, especially, makes conditions more severe and causes main components' damage and reduction of life span for steam turbine. Thus accurate knowledge of thermal and centrifugal stresses are required for the integrity and lifetime assessment for the turbine rotor. So far, only elastic calculations are currently performed for simplicity. However, it is well known that the materials of steam turbine rotor deform inelastically at high temperature. Existing models proposed to describe the viscoplastic(rate-dependent) behavior are rather elaborate and difficult to incorporate with computer simulations in the case of complex structures. In this paper, the life assessment for steam turbine rotor was established by combining the inelastic behavior and the finite element method. The inelastic analysis was particularly focused on viscoplastic behavior that is simple enough to be used effectively in computer simulation and matches the essential features of the time-dependent inelastic behavior of materials reasonably well for cyclic loading under non-isothermal conditions. Using this study, life consumption of steam turbine rotor can be obtained. Sun, 01 Jan 2006 00:00:00 GMT https://pubs.kist.re.kr/handle/201004/116753 2006-01-01T00:00:00Z