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Responsibility for the Virginia Tech Shooting
Jaesik Ha,Uche Onyebadi,Dong-Hee Shin 한국정보사회학회 2017 정보사회와 미디어 Vol.18 No.2
This study investigates how the U.S. and South Korean newspapers framed the Virginia Tech Shooting incident in 2007 in different ways. The findings demonstrate that South Korean newspapers tended to use the “individual responsibility” frame, emphasizing that the incident was a highly individualized affair. In contrast, the U.S. newspapers highlighted a perspective presenting the problem as one for society at large. In addition, the U.S. newspapers viewed the issue from the broader national perspective of college shootings in general. In contrast, South Korean newspapers put the blame on the killer. Overall, this study shows how localized socio-cultural perspectives can affect the framing of the same reality across nations.
Configuration of a Monopulse Antenna Assembly for Small Diameter Flight Vehicle Applications
Jaesik Kim 한국전자파학회JEES 2021 Journal of Electromagnetic Engineering and Science Vol.21 No.3
In this letter, configuration of a monopulse direction-finding (DF) antenna assembly is presented which can be applied for small diameter flight vehicle applications. The assembly consists of five antennas which consist of four radome mounted antennas and a slot fed cavity antenna. All antennas are located inside of a tangent ogive radome of 1.52 λc inner radius where λc corresponds to the wavelength of the center frequency. To verify the DF performance of the antenna assembly, sum (Σ) and delta (Δ)-patterns are measured and its Δ/Σ monopulse curves are presented.
Robust Multiview Photometric Stereo Using Planar Mesh Parameterization
Jaesik Park,Sinha, Sudipta N.,Matsushita, Yasuyuki,Yu-Wing Tai,In So Kweon IEEE 2017 IEEE transactions on pattern analysis and machine Vol.39 No.8
<P>We propose a robust uncalibrated multiview photometric stereo method for high quality 3D shape reconstruction. In our method, a coarse initial 3D mesh obtained using a multiview stereo method is projected onto a 2D planar domain using a planar mesh parameterization technique. We describe methods for surface normal estimation that work in the parameterized 2D space that jointly incorporates all geometric and photometric cues from multiple viewpoints. Using an estimated surface normal map, a refined 3D mesh is then recovered by computing an optimal displacement map in the same 2D planar domain. Our method avoids the need of merging view-dependent surface normal maps that is often required in conventional methods. We conduct evaluation on various real-world objects containing surfaces with specular reflections, multiple albedos, and complex topologies in both controlled and uncontrolled settings and demonstrate that accurate 3D meshes with fine geometric details can be recovered by our method.</P>
High-Quality Depth Map Upsampling and Completion for RGB-D Cameras
Jaesik Park,Hyeongwoo Kim,Yu-Wing Tai,Brown, Michael S.,In So Kweon IEEE 2014 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.23 No.12
<P>This paper describes an application framework to perform high-quality upsampling and completion on noisy depth maps. Our framework targets a complementary system setup, which consists of a depth camera coupled with an RGB camera. Inspired by a recent work that uses a nonlocal structure regularization, we regularize depth maps in order to maintain fine details and structures. We extend this regularization by combining the additional high-resolution RGB input when upsampling a low-resolution depth map together with a weighting scheme that favors structure details. Our technique is also able to repair large holes in a depth map with consideration of structures and discontinuities utilizing edge information from the RGB input. Quantitative and qualitative results show that our method outperforms existing approaches for depth map upsampling and completion. We describe the complete process for this system, including device calibration, scene warping for input alignment, and even how our framework can be extended for video depth-map completion with the consideration of temporal coherence.</P>
Seasonal Variation of Cosmic Ray Intensity Observed by the Oulu Neutron Monitor
Jaesik Jeong,Suyeon Oh 한국우주과학회 2020 Journal of Astronomy and Space Sciences Vol.37 No.3
Muons and neutrons are representative secondary particles that are generated by interactions between primary cosmic ray particles (mostly protons) and the nuclei of atmospheric gas compounds. Previous studies reported that muons experience seasonal variations because of the meteorological effects of temperature. The intensity of neutrons has a typical modulation with various periods and reasons, such as diurnal and solar variation or transient events. This paper reports that cosmic ray particles, which were observed by neutron monitors, have seasonal variations using the daily data at the Oulu neutron monitor. To eliminate the effects of solar activity across time, the daily data were normalized by two different transformations: transformations with respect to the grand mean and yearly mean. The data after transformation with respect to the yearly mean showed more statistical stability and clear seasonal variations. On the other hand, it is difficult to determine if the seasonal variation results from terrestrial effects, such as meteorological factors, or extraterrestrial effects, such as the position of the Earth in its orbit of revolution.
Jointless Pancake Coil Winding for Minimizing Electrical Loss in HTS SMES for Wind Power
Jaesik Kang,Tae Kuk Ko,Al-Ammar, Essam A.,Kyeon Hur Institute of Electrical and Electronics Engineers 2015 IEEE transactions on applied superconductivity Vol.25 No.3
<P>Many different applications of superconducting devices have been designed using a modular pancake arrangement. It has been reported that this modular pancake structure provides excellent mechanical holding, effective cooling, and high magnetic flux density for stability of the superconducting coil. However, soldering for interconnecting each double pancake causes current decay, cryogenic coolant loss, and thermal stress. Thus, this paper investigates an improved double pancake winding, named the “jointless double pancake coil winding” and demonstrates the efficacy for minimizing the electrical loss of the high-temperature superconducting (HTS) coil, assembled in the modular double pancake types. It presents a winding method that avoids soldering between the pancake connections and thus removes the primary cause of the electrical loss generated in the existing design. This proposed winding method can effectively achieve zero electrical loss. This paper particularly presents the application of the proposed winding for the HTS-SMES and demonstrates the feasibility and improved functional benefits with reference to the conventional coil. This paper should maximize the operational benefits of using the SMES coil employing the proposed winding method in charge and discharge operations and should increase the effectiveness and efficiency in cryogenic systems.</P>