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Effects of Mesh Planes on Signal Integrity in Glass Ceramic Packages for High-Performance Servers
Choi, Jinwoo,Altabella Lazzi, Dulce M.,Becker, Wiren D. The Korean Institute of Electromagnetic Engineerin 2013 전자파기술 Vol.24 No.2
This paper discusses effects of mesh planes on signal integrity in high-speed glass ceramic packages. One of serious signal integrity issues in high-speed glass ceramic packages is high far-end (FE) noise coupling between signal interconnects. Based on signal integrity analysis, a methodology is presented for reducing far-end noise coupling between signal interconnects in high-speed glass ceramic modules. This methodology employing power/ground mesh planes with alternating spacing and a via-connected coplanar-type shield (VCS) structure is suggested to minimize far-end noise coupling between signal lines in high-speed glass ceramic packages. Optimized interconnect structure based on this methodology has demonstrated that the saturated far-end noise coupling of a typical interconnect structure in glass ceramic modules could be reduced significantly by 73.3 %.
Jinwoo Choi,서영수,Wan-Gyu Lee,정종완 한국물리학회 2013 Current Applied Physics Vol.13 No.7
The high contact resistance of organic thin film transistors (OTFTs), due to the work function difference between metal electrode and organic channel, seriously decreases the electrical properties. Graphene electrode could reduce the contact resistance and improve the electrical performance of OTFTs. However,the high chemical vapor deposition (CVD) temperature (900e1000 C) limits the available OTFT substrate in the case of direct graphene growth on S/D metal electrodes. Furthermore, the application of a transferred graphene electrode induces significant problems due to the transfer process. In this work,thin graphite sheet was directly grown on a metal electrode by the inductively coupled plasma-chemical vapor deposition (ICP-CVD) method at as low temperature as 400, 500 C. We show that OFETs with thin graphite sheet/metal, grown at 400, 500 C, exhibit much lower contact resistance than OFETs with metal-only electrode.
Jinwoo Choi,Seongam Moon 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.1
Although the Rare event has a very wide application range, it has limitations in that it requires mathematical knowledge and the calculation process is complicated for the Bayesian approach, which was mainly used in previous studies. Therefore, rare events need to be easily analyzed. In this study, the critical failures of the ROK Naval ship were analyzed. Bayesian inference was not applied. The long-term trend (B-spline) and short-term probability (phase-type distribution) were fitted and combined. Phase-type distribution is a useful technique that can estimate the probability distribution of a desired shape with one parameter. This study is meaningful in that only an easy methodology was used, Phase-type distribution was applied to the analysis of rare events, and only a very small number of data were analyzed.
Jinwoo Choi,Dong Gun Kam,Daehyun Chung,Srinivasan, K.,Govind, V.,Joungho Kim,Swaminathan, M. Institute of Electrical and Electronics Engineers 2007 IEEE transactions on advanced packaging Vol.30 No.2
<P>This paper presents near-field (NF) and far-field (FF) analysis of alternating impedance electromagnetic bandgap (AI-EBG) structure in packages and boards. Three test vehicles have been designed and fabricated for NF and FF measurements. Simulation results using a full-wave solver (SONNET) have been compared with measurement results. This paper investigates the radiation due to return current on different reference planes. The analysis results from simulations and measurements provide important guidelines for design of the AI-EBG structure based power distribution network for noise isolation and suppression in mixed-signal systems</P>
Choi, Boreum,Lee, Inseong,Choi, Dongseong,Kim, Jinwoo Mary Ann Liebert 2007 Cyber Psychology & Behavior Vol.10 No.4
<P>Today millions of players interact with one another in online games, especially massively multiplayer online role-playing games (MMORPGs). These games promote interaction among players by offering interdependency features, but to date few studies have asked what interdependency design factors of MMORPGs make them fun for players, produce experiences of flow, or enhance player performance. In this study, we focused on two game design features: task and reward interdependency. We conducted a controlled experiment that compared the interaction effects of low and high task-interdependency conditions and low and high reward-interdependency conditions on three dependent variables: fun, flow, and performance. We found that in a low task-interdependency condition, players had more fun, experienced higher levels of flow, and perceived better performance when a low reward-interdependency condition also obtained. In contrast, in a high task-interdependency condition, all of these measures were higher when a high reward-interdependency condition also obtained.</P>
Development of Centering Method for Automatic Generation of a Quadrilateral Mesh
Choi, Jinwoo Society for Computational Design and Engineering 2011 International Journal of CAD/CAM Vol.11 No.1
A new method has been developed in this paper for automatic quadrilateral mesh generation for a two-dimensional domain. The method is named 'centering method' because it centers a point at the domain and then divides it into sub-domains using cutting lines from the center point. Each of the cutting lines is selected based on the criterion using the angles between the boundary of the domain and the cutting line. The decomposition of the domain into sub-domains is repeated until every subdomain has four or six nodes. Pre-defined splitters are used to divide six-node domains into quadrilateral elements depending on their configuration and presence on the boundary of the initial domain. Arbitrary domains are meshed as examples to verify the robustness of the new method.