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문상미(Sangmi Moon),김보라(Bora Kim),사란쉬 말리크(Saransh Malik),김지형(Jihyung Kim),이문식(Moon-Sik Lee),김대진(Daejin Kim),황인태(Intae Hwang) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.8
최근 폭증하는 모바일 데이터 트래픽을 수용하기 위하여 밀리미터파 (mmWave)가 큰 관심을 받고 있으며, 4 세대 LTE-A (Long Term Evolution-Advanced) 표준을 기반으로 MMB (Millimeter Mobile Broadband) 시스템의 필요성이 대두되고 있다. 현재 mmWave 통신 채널에 대한 많은 연구가 이루어지고 있으며, MMB 채널 환경에 대한 성능 분석 또한 관심의 대상이다. 본 논문에서는 5세대 이동통신을 위한 MMB 시스템을 설계하고 mmWave의 전파 특성 분석을 통한 채널 모델을 제안한다. 또한 MMB 시스템의 28 GHz 대역에서 MMB 채널 환경에 대한 성능을 비교 분석한다. Millimeter wave (mmWave) has attracted great interest recently and the necessity of Millimeter Mobile Broadband (MMB) system has appeared based on the 4 Generation Long Term Evolution-Advanced (LTE-A) Specification. Currently, there are many studies about the mmWave communication channel. And it is subject of interest to analyze the performance in MMB channel environments. In this paper, we design the MMB system for 5th Generation mobile communication and propose channel models through the analysis of the mmWave propagation characteristics. Also, we have analyzed the performance of the MMB system of 28 GHz band in MMB channel environments.
An HLA-Based Distributed Cosimulation Framework in Mixed-Signal System-on-Chip Design
Seok, Moon Gi,Kim, Tag Gon,Choi, Chang Beom,Park, Daejin IEEE 2017 IEEE transactions on very large scale integration Vol.25 No.2
<P>In mixed-signal system-on-chip (SoC) design, distributed cosimulation is one of the practical approaches for unifying various abstracted hardware models using different description languages. Conventional ad hoc distributed cosimulation solutions do not have formal theoretical backgrounds of simulator integration into their solutions. In this brief, we propose a general cosimulation framework based on the high-level architecture (HLA) and newly defined programming language interface for interoperation (PLI-I) as a formal simulator interface. Based on the PLI-I and HLA, we propose formal integration and interoperation procedures. To reduce integration costs, the procedures have been developed into a common library and then merged with modeldependent signal-event converter to handle differently abstracted in/out signals. During the interoperation, to resolve the different time-advance mechanisms of the digital and analog simulators, the adapter executes an advanced HLA-based synchronization based on the presimulation concepts. The case study shows the reduced design effort in integrating and validating the heterogeneous models and simulators using the proposed framework in mixed-signal SoC design.</P>
An HLA-Based Formal Co-Simulation Approach for Rapid Prototyping of Heterogeneous Mixed-Signal SoCs
SEOK, Moon Gi,KIM, Tag Gon,PARK, Daejin 'Institute of Electronics, Information and Communi 2017 IEICE transactions on fundamentals of electronics, Vol.ea100 No.7
<P>The rapid prototyping of a mixed-signal system-on-chip (SoC) has been enabled by reusing predesigned intellectual properties (IPs) and by integrating newly designed IP into the top design of SoC. The IPs have been designed on various hardware description levels, which leads to challenges in simulations that evaluate the prototyping. One traditional solution is to convert these heterogeneous IP models into equivalent models, that are described in a single description language. This conversion approach often requires manual rewriting of existing IPs, and this results in description loss during the model projection due to the absence of automatic conversion tools. The other solutions are co-simulation/emulation approaches that are based on the coupling of multiple simulators/emulators through connection modules. The conventional methods do not have formal theoretical backgrounds and an explicit interface for integrating the simulator into their solutions. In this paper, we propose a general co-simulation approach based on the high-level architecture (HLA) and a newly-defined programming language interface for interoperation (PLI-I) between heterogeneous IPs as a formal simulator interface. Based on the proposed PLI-I and HLA, we introduce formal procedures of integration and interoperation. To reduce integration costs, we split these procedures into two parts: a reusable common library and an additional model-dependent signal-to event (SE) converter to handle differently abstracted in/out signals between the coupled IPs. During the interoperation, to resolve the different time advance mechanisms and increase computation concurrency between digital and analog simulators, the proposed co-simulation approach performs an advanced HLA-based synchronization using the pre-simulation concepts. The case study shows the validation of interoperation behaviors between the heterogeneous IPs in mixed-signal SoC design, the reduced design effort in integrating, and the synchronization speedup using the proposed approach. key words: system-level verification, system-on-chip design, mixed-signal design, simulator interoperation, HLA/RTI</P>
Switching the Charge State of Individual Surface Atoms at Si(111)-√3 × √3:B Surfaces
Eom, Daejin,Moon, Chang-Youn,Koo, Ja-Yong American Chemical Society 2015 NANO LETTERS Vol.15 No.1
<P>We show that each surface atom of heavily boron-doped, (111)-oriented silicon with a √3 × √3 reconstruction has electrically switchable two charge states due to the strong electron–lattice coupling at this surface. The structural and electronic properties of the two charge states as well as their energetics are uncovered by employing scanning tunneling microscopy measurements and density functional theory calculations, which reveals that one of the two is a two-electron bound state or surface bipolaron. We also execute the single-atom bit operations on individual surface atoms by controlling their charge states while demonstrating implementation of the atomic scale memory at a silicon surface with an unprecedented recording density.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-1/nl503724x/production/images/medium/nl-2014-03724x_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl503724x'>ACS Electronic Supporting Info</A></P>