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A Pen-Pressure-Sensitive Capacitive Touch System Using Electrically Coupled Resonance Pen
Changbyung Park,Sungsoo Park,Ki-Duk Kim,Sanghui Park,Juwan Park,Byunghoon Kang,Yunhee Huh,Gyu-Hyeong Cho IEEE 2016 IEEE journal of solid-state circuits Vol.51 No.1
<P>A touch system sensing pen-pressure of the proposed electrically coupled resonance (ECR) pen is implemented, which can replace costly digitizer system containing electro magnetic resonance (EMR) and capacitive touch system. The proposed system detects the location of the ECR pen and finger using proposed position sensor, and senses pen-pressure of ECR pen using proposed pen-pressure sensor. For the position sensor, to detect even small variation of the mutual capacitance on touch screen panel (TSP) of the pen, a simultaneous driving scheme is proposed with modified Hadamard matrix, resulting in highly increased dynamic range and SNR. In the proposed pen-pressure sensor, the resonant frequency of the ECR pen is measured by a frequency to voltage converter based sensor. The measured SNR for the pen position is 49 dB with 1 mm phi metal pillar, and 6.5-bit resolution is achieved for pen-pressure sensor in 6 sigma criteria.</P>
Sungsoo Park,Joong-Min Park,Jin-Jo Kim,In-Seob Lee,Sang-Uk Han,Kyung Won Seo,Jin Won Kwon 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.3
Backgrounds/AimsThis multicenter study aims to evaluate the effect and feasibility of anti-reflux surgery compared with medical treatment forgastroesophageal reflux disease (GERD). MethodsPatients with GERD who were undergoing medical treatment with proton pump inhibitors for more than 8 weeks and those whowere scheduled to undergo anti-reflux surgery were enrolled. Efficacy of pre-operative medical treatment was evaluated retrospectivelyand effect of anti-reflux surgery was prospectively evaluated at 1 week and 3 months after surgery. Quality of life (QOL) was alsoinvestigated before and after surgery. ResultsBetween February and October 2018, 51 patients underwent laparoscopic Nissen fundoplication for treating GERD at 5 hospitalsin Korea. Thirty-four patients (66.7%) showed poor proton pump inhibitor response. At 3 months after surgery, heartburn wascompletely resolved in 87.9% patients and partially improved in 9.1%. Acid regurgitation was completely resolved in 82.9% andpartially improved in 11.4%. Atypical extraesophageal symptoms were completely controlled in 45.5% and partially controlled in36.4%. GERD-related QOL scores at 1 week after surgery significantly improved compared with pre-operative scores. There was nodifference in GERD-related QOL scores between 1 week and 3 months after surgery. General QOL measured with European QOL-5dimensions and health-related QOL instrument with 8 items significantly improved after anti-reflux surgery. Satisfaction with treatmentwas significantly higher after surgery than before surgery (72.5% vs 11.8%, P < 0.001). ConclusionAnti-reflux surgery improved GERD symptoms and QOL in patients. Anti-reflux surgery is an effective treatment option compared withmedical treatment for GERD patients selected for surgical treatment.
Sungsoo Park(박성수),Byoungdeog Choi(최병덕) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
High-k dielectric materials are popularly being used in devices such as gate insulators or cell capacitors. Dielectrics using high-k materials guarantee high permittivity, yet tend to get more leakage current and eventually be made up for laminated structures. This study investigates the differences in electrical characteristics of metal-insulator-metal (MIM) capacitors composed of ZrO₂-Al₂O₃-ZrO₂ (ZAZ) laminate dielectric under three varying bottom electrode-alumina distances (Db). Each ZAZ was laminated on a highly doped polycrystalline silicon substrate with extremely low resistivity, using atomic layer deposition (ALD). Lastly, aluminum electrodes with 300 μm diameter and 70 nm thickness are deposited by an electron-beam evaporator (E-beam) on the top of the laminates. For each of the three ZAZs, characteristics of capacitance, normalized capacitance, and leakage current density were measured. The capacitance shows a slight increment as Db enlarges. However, the changes in normalized capacitances are the smallest when the interlayer alumina is located in the center. From this investigation, it is identifiable that the leakage current density and capacitance increase as the alumina layer is stacked closer to the aluminum electrode. Nevertheless, more variance in the capacitance happened as the alumina layer gets closer to either side of the electrodes. These phenomena result from the trapped electron charges of the quantum well developed in the oxide interface. The interface electrons of the zirconia-alumina interface are induced through zirconia, by Thermionic-emission and Poole-Frenckel emission. This experiment is expected to be helpful to define an ideal laminate method for MIM capacitor dielectrics.
Integer Programming Approach to the Convergence Adjustment on Color Display Tube
Park, Sungsoo,Kang, Donghan,Lee, Hyohyung,Hong, Cheol-Kee Korean Institute of Industrial Engineers 2004 Industrial Engineeering & Management Systems Vol.3 No.1
In this paper, we consider the adjustment of convergence on Color Display Tube (CDT). Convergence is a measure of how well the red, green and blue beams are physically aligned with each other to strike the same area on the screen. When misconvergence (convergence error) occurs, one way of compensating it is to attach several ferrite sheets on the inner part of Deflection Yoke (DY). We suggest an optimization model of misconvergence compensation process and report test results for 81 DY samples. As a result, more than 90% of the samples could be made to satisfy the required convergence criteria.
Achievable Throughput of Energy Harvesting Cognitive Radio Networks
Sungsoo Park,Daesik Hong IEEE 2014 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.13 No.2
<P>We consider energy harvesting cognitive radio networks to improve both energy efficiency and spectral efficiency. The goal of this paper is to analyze the theoretically achievable throughput of the secondary transmitter, which harvests energy from ambient sources or wireless power transfer systems while opportunistically accessing the spectrum licensed to the primary network. By modeling the temporal correlation of the primary traffic according to a time-homogeneous discrete Markov process, we derive the upper bound on the achievable throughput as a function of the energy arrival rate, the temporal correlation of the primary traffic, and the detection threshold for a spectrum sensor. The optimal detection threshold is then derived to maximize the upper bound on the achievable throughput under an energy causality constraint and a collision constraint. The energy causality constraint mandates that the total consumed energy should not exceed the total harvested energy, while the collision constraint is required to protect the primary network from secondary transmission. Analytical results show the temporal correlation of the primary traffic to enable efficient usage of the harvested energy by preventing the secondary transmitter from accessing the spectrum that may be occupied by the primary network.</P>
Sungsoo Na,Jaeyong Park,Chul H. Park,Moon K. Kwak,Jae-Hong Shim 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.8
This paper addresses the analytical modeling and dynamic response of the advanced composite rotating blade modeled as thin-walled beams and incorporating viscoelastic material. The blade model incorporates non-classical features such as anisotropy, transverse shear, rotary inertia and includes the centrifugal and coriolis force fields. The dual technology including structural tailoring and passive damping technology is implemented in order to enhance the vibrational characteristics of the blade. Whereas structural tailoring methodology uses the directionality properties of advanced composite materials, the passive material technology exploits the damping capabilities of viscoelastic material (VEM) embedded into the host structure. The VEM layer damping treatment is modeled by using the Golla-Hughes-McTavish (GHM) method, which is employed to account for the frequency-dependent characteristics of the VEM. The case of VEM spread over the entire span of the structure is considered. The displayed numerical results provide a comprehensive picture of the synergistic implications of both techniques, namely, the tailoring and damping technology on the dynamic response of a rotating thin-walled beam exposed to external time-dependent excitations.