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Cho, Jonghyun,Kim, Myunghoi The Korea Institute of Information and Commucation 2017 Journal of information and communication convergen Vol.15 No.4
This paper presents an analysis of the electromagnetic interference of a heterogeneous power bus where electromagnetic bandgap (EBG) cells are irregularly arranged. To mitigate electrical-noise coupling between high-speed circuits, the EBG structure is placed between parallel plate waveguide (PPW)-based power buses on which the noise source and victim circuits are mounted. We examine a noise suppression characteristic of the heterogeneous power bus in terms of scattering parameters. The characteristics of the dispersion and scattering parameters are compared in the sensitivity analysis of the EBG structure. Electric field distributions at significant frequencies are thoroughly examined using electromagnetic simulation based on a finite element method (FEM). The noise suppression characteristics of the heterogeneous power bus are demonstrated experimentally. The heterogeneous power bus achieves significant reduction of electrical-noise coupling compared to the homogeneous power buses that are adopted in conventional high-speed circuit design. In addition, the measurements show good agreement with the FEM simulation results.
Modeling and Analysis of Through-Silicon Via (TSV) Noise Coupling and Suppression Using a Guard Ring
Jonghyun Cho,Eakhwan Song,Kihyun Yoon,Jun So Pak,Joohee Kim,Woojin Lee,Taigon Song,Kiyeong Kim,Junho Lee,Hyungdong Lee,Kunwoo Park,Seungtaek Yang,Minsuk Suh,Kwangyoo Byun,Joungho Kim IEEE 2011 IEEE transactions on components, packaging, and ma Vol.1 No.2
<P>In three-dimensional integrated circuit (3D-IC) systems that use through-silicon via (TSV) technology, a significant design consideration is the coupling noise to or from a TSV. It is important to estimate the TSV noise transfer function and manage the noise-tolerance budget in the design of a reliable 3D-IC system. In this paper, a TSV noise coupling model is proposed based on a three-dimensional transmission line matrix method (3D-TLM). Using the proposed TSV noise coupling model, the noise transfer functions from TSV to TSV and TSV to the active circuit can be precisely estimated in complicated 3D structures, including TSVs, active circuits, and shielding structures such as guard rings. To validate the proposed model, a test vehicle was fabricated using the Hynix via-last TSV process. The proposed model was successfully verified by frequency- and time-domain measurements. Additionally, a noise isolation technique in 3D-IC using a guard ring structure is proposed. The proposed noise isolation technique was also experimentally demonstrated; it provided -17 dB and -10dB of noise isolation between the TSV and an active circuit at 100 MHz and 1 GHz, respectively.</P>
Suppression of Parallel Plate Modes Using Edge-Located EBG Structure in High-Speed Power Bus
Cho, Jonghyun,Kim, Myunghoi The Korea Institute of Information and Commucation 2016 Journal of information and communication convergen Vol.14 No.4
An edge-located electromagnetic bandgap (EL-EBG) structure using a defected ground structure (DGS) is proposed to suppress resonant modes induced by edge excitation in a two-dimensional planar parallel plate waveguide (PPW). The proposed EL-DGS-EBG PPW significantly mitigates multiple transverse-magnetic (TM) modes in a wideband frequency range corresponding to an EBG stopband. To verify the wideband suppression, test vehicles of a conventional PPW, a PPW with a mushroom-type EBG structure, and an EL-DGS-EBG PPW are fabricated using a commercial process involving printed circuit boards (PCBs). Measurements of the input impedances show that multiple resonant modes of the previous PPWs are significantly excited through an input port located at a PPW edge. In contrast, resonant modes in the EL-DGS-EBG PPW are substantially suppressed over the frequency range of 0.5 GHz to 2 GHz. In addition, we have experimentally demonstrated that the EL-DGS-EBG PPW reduces the radiated emission from -24 dB to -44 dB as compared to the conventional PPW.
Sloped Terrain Segmentation for Autonomous Drive Using Sparse 3D Point Cloud
Cho, Seoungjae,Kim, Jonghyun,Ikram, Warda,Cho, Kyungeun,Jeong, Young-Sik,Um, Kyhyun,Sim, Sungdae Hindawi Publishing Corporation 2014 The Scientific World Journal Vol.2014 No.-
<P>A ubiquitous environment for road travel that uses wireless networks requires the minimization of data exchange between vehicles. An algorithm that can segment the ground in real time is necessary to obtain location data between vehicles simultaneously executing autonomous drive. This paper proposes a framework for segmenting the ground in real time using a sparse three-dimensional (3D) point cloud acquired from undulating terrain. A sparse 3D point cloud can be acquired by scanning the geography using light detection and ranging (LiDAR) sensors. For efficient ground segmentation, 3D point clouds are quantized in units of volume pixels (voxels) and overlapping data is eliminated. We reduce nonoverlapping voxels to two dimensions by implementing a lowermost heightmap. The ground area is determined on the basis of the number of voxels in each voxel group. We execute ground segmentation in real time by proposing an approach to minimize the comparison between neighboring voxels. Furthermore, we experimentally verify that ground segmentation can be executed at about 19.31 ms per frame.</P>
( Jonghyun Choi ),( Yongwoo Jang ),( Haedong Kim ),( Jungwon Wee ),( Sinyoung Cho ),( Woo Sung Son ),( Sung Min Kim ),( Young Duk Yang ) 생화학분자생물학회(구 한국생화학분자생물학회) 2018 BMB Reports Vol.51 No.5
Anoctamin 1 (ANO1) is an anion channel that is activated by changes in cytosolic Ca<sup>2+</sup> concentration and noxious heat. Although the critical roles of ANO1 have been elucidated in various cell types, the control of its gating mechanisms by Ca<sup>2+</sup> and heat remain more elusive. To investigate critical amino acid residues for modulation of Ca<sup>2+</sup> and heat sensing, we constructed a randomized mutant library for ANO1. Among 695 random mutants, reduced Ca<sup>2+</sup> sensitivity was observed in two mutants (mutant 84 and 87). Consequently, the E143A mutant showed reduced sensitivity to Ca<sup>2+</sup> but not to high temperatures, whereas the E705V mutant exhibited reduced sensitivity to both Ca<sup>2+</sup> and noxious heat. These results suggest that the glutamic acids (E) at 143 and 705 residues in ANO1 are critical for modulation of Ca<sup>2+</sup> and/or heat responses. Furthermore, these findings help to provide a better understanding of the Ca<sup>2+</sup>-mediated activation and heat-sensing mechanism of ANO1. [BMB Reports 2018; 51(5): 236-241]
( Jonghyun Kim ),( Soyoung Jeong ),( Donghyu Cho ) 대한산부인과학회 2015 Obstetrics & Gynecology Science Vol.58 No.5
Congenital afibrinogenemia/hypofibrinogenemia is a rare inherited hematologic disorder in which a patient lacks or has insufficient level of fibrinogen, the blood coagulation factor I. The incidence of this uncommon disease is 1 to 2 per 1 million individuals. Hence, massive hemoperitoneum caused by ovulation in a woman with congenital afibrogenemia is also a very rare clinical condition. Massive hemoperitoneum usually presents as acute abdominal pain with potential findings of peritonitis including abdominal distention, hypotension and tachycardia with critical consequences. We performed emergent endoscopic surgery for hemoperitoneum caused by a ruptured corpus luteum cyst in a patient with congenital hypofibrinogenemia. To the best of our knowledge, this was the first case report of such treatment in Korea.