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저전력 모바일 장치를 위한 완전 프로그램 가능형 쉐이더 프로세서
정형기,이주석,박태룡,이광엽,Jeong, Hyung-Ki,Lee, Joo-Sock,Park, Tae-Ryong,Lee, Kwang-Yeob 한국전기전자학회 2009 전기전자학회논문지 Vol.13 No.2
본 논문에서는 전용하드웨어를 사용하지 않는 새로운 구조의 범용 그래픽 쉐이더 프로세서를 제안한다. 최근 모바일 기기에서는 고성능을 유지하면서 저전력의 작은 크기를 가지는 그래픽 프로세서를 요구한다. 제안하는 쉐이더 프로세서는 OpenGL ES 2.0 그래픽 파이프라인 전체를 쉐이더 명령어로 실행할 수 있는 GP-GPU 구조를 갖는다. 프로그램을 구현하여 하나의 프로세서로 모든 그래픽 파이프라인 처리가 가능하기 때문에 Rasterization Unit과 같은 별도의 전용 하드웨어를 필요로 하지 않는다. 따라서 쉐이더 프로세서 하나로 Fully Programmable 3D Graphics Engine 구현이 가능하며 기존 쉐이더 프로세서에 비해 하드웨어 크기를 60% 줄였다. In this paper, we propose a novel architecture of a general graphics shader processor without a dedicated hardware. Recently, mobile devices require the high performance graphics processor as well as the small size, low power. The proposed shader processor is a GP-GPU(General-Purpose computing on Graphics Processing Units) to execute the whole OpenGL ES 2.0 graphics pipeline by using shader instructions. It does not require the separate dedicate H/W such as rasterization on this fully programmable capability. The fully programmable 3D graphics shader processor can reduce much of the graphics hardware. The chip size of the designed shader processor is reduced 60% less than the sizes of previous processors.
3D Programmable Shader 검증을 위한 소프트웨어 시스템 구성
정형기(Hyung-Ki Jeong),김상연(Sang-Yeon Kim),이광엽(Kwang-Yeob Lee),유현준(Hyun-June Yoo),허현민(Hyun-Min Hur) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
In the case to verify 3D Graphics HDL design model, we know the best way of a verification that is making the verification system on embedded SoC platform. But it’s too difficult to design & verify the IPs for SoC components. In this paper, we present more easy way to verify not only 3D shader, but also the other complex HDL design. This verification method will be given highly improvement in reliability & design time cost.
듀얼 페이즈 명령어 파이프라인구조의 쉐이더 프로세서 설계
정형기(Jeong, Hyung-Ki),남기훈(Nam, Ki-Hun),이광엽(Lee, Gwang-Yeob) 한국전기전자학회 2008 전기전자학회논문지 Vol.12 No.4
본 논문에서는 멀티 스레드와 듀얼 페이즈 명령어 파이프라인을 가진 4way SIMD 프로세서를 설계하였다. 8개의 스레드가 round-robin 방식으로 실행되어, 해저드를 발생시키지 않는다. 또한 듀얼 페이즈 기능은 1개의 코어가 2개의 프로세서처럼 동작하도록 명령어를 최대 4개를 입력 받아 처리한다. 이 가변 명령어 구조는 1차와 2차 페이즈로 나뉘어 명령어를 수식할 수 있으며, 이 기능을 통해 분기명령이나 어드레싱 명령을 단일 클럭에 수행할 수 있도록 한다. 이 프로세서는 명령어 수행 시간을 일반적인 SIMD 구조에 비하여 50% 이하로 단축시킬 수 있으며, 최대 2배의 성능향상을 보이고 25%까지 코드 크기를 줄일 수 있다.. This paper represents a design of a 4 way SIMD processor with multi-thread and dual phase instruction pipeline. 8 threads can be performing in round-robin order, so any hazards can’t occur. The dual phase pipeline makes a pipeline operate as two pipelines, and it can fetch maximum 4 unit instructions at once. This variable length instruction set divide into first phase and second phase instructions, and with this function, complex branch and addressing can be executed at one clock cycle. This processor reduces the code size to quarter, pull out the doubled performance improvement than normal SIMD architecture.
간조직 검사에서 호산구성 혈관염 증명으로 진단된 churg-strauss 증후군 1예
김형상 ( Hyoung Sang Kim ),정형기 ( Hyung Ki Jeong ),김동현 ( Dong Hyun Kim ),유지은 ( Jieun Yu ),김영 ( Young Kim ),고영일 ( Young Il Koh ) 대한소아알레르기호흡기학회(구 대한소아알레르기 및 호흡기학회) 1991 소아알레르기 및 호흡기학회지 Vol.1 No.2
Purpose: Churg-Strauss syndrome (CSS) is a rare disease characterized by pulmonary and systemic small vessel necrotizing vasculitis and peripheral blood eosinophilia occurring in asthmatics. Cases of CSS with hepatic involvement have been rarely reported. Here, we reported a case of CSS involving liver, in which liver biopsy revealed eosinophilic vasculitis. Methods: A 75-year-old man complained of dyspnea and hemoptysis. He had severe blood eosinophilia (white blood cell 28,320/μL, eosinophils 79%). Computed tomography of chest and abdomen showed infiltrations in lungs and multifocal infiltrations in both hepatic lobes. Methacholine PC20 was 2.89 mg/mL, which was in asthmatic range. Results: Ultrasonography-guided liver biopsy was performed, showing eosinophilic vasculitis and portal granulomas. CSS can be diagnosed based on evidence of asthma, blood eosinophilia, pulmonary infiltration and vasculitis on biopsy. Conclusion: Taken together, in a suspected case of CSS presenting as hepatic involvement, liver biopsy may be useful to demonstrate the presence of vasculitis. (Allergy Asthma Respir Dis 2013;1:164-167)
간조직 검사에서 호산구성 혈관염 증명으로 진단된 churg-strauss 증후군
김형상 ( Hyoung Sang Kim ),정형기 ( Hyung Ki Jeong ),김동현 ( Dong Hyun Kim ),유지은 ( Ji Eun Yu ),김영 ( Young Kim ),고영일 ( Young Il Koh ) 대한천식알레르기학회 2013 Allergy Asthma & Respiratory Disease Vol.1 No.2
Purpose: Churg-Strauss syndrome (CSS) is a rare disease characterized by pulmonary and systemic small vessel necrotizing vasculitis and peripheral blood eosinophilia occurring in asthmatics. Cases of CSS with hepatic involvement have been rarely reported. Here, we reported a case of CSS involving liver, in which liver biopsy revealed eosinophilic vasculitis. Methods: A 75-year-old man complained of dyspnea and hemoptysis. He had severe blood eosinophilia (white blood cell 28,320/μL, eosinophils 79%). Computed tomography of chest and abdomen showed infiltrations in lungs and multifocal infiltrations in both hepatic lobes. Methacholine PC20 was 2.89 mg/mL, which was in asthmatic range. Results: Ultrasonography-guided liver biopsy was performed, showing eosinophilic vasculitis and portal granulomas. CSS can be diagnosed based on evidence of asthma, blood eosinophilia, pulmonary infiltration and vasculitis on biopsy. Conclusion: Taken together, in a suspected case of CSS presenting as hepatic involvement, liver biopsy may be useful to demonstrate the presence of vasculitis. (Allergy Asthma Respir Dis 2013;1:164-167)Allergy Asthma Respir Dis 2013;1:164-167)
심방세동 환자에서 주요 항부정맥제의 전기생리 작용의 차이
장수영 ( Su Young Jang ),조정관 ( Jeong Gwan Cho ),정형기 ( Hyung Ki Jung ),기원주 ( Won Ju Ki ),이경진 ( Kyoung Jin Lee ),고점석 ( Jum Suk Ko ),이민구 ( Min Goo Lee ),박근호 ( Keun Ho Park ),심두선 ( Doo Sun Sim ),윤남식 ( Nam Si 대한내과학회 2011 대한내과학회지 Vol.80 No.6
Background/Aims: Drug-eluting stents (DES) are superior to bare metal stents (BMS) in reducing restenosis rates across a wide range of patients and lesion subsets.This study compared the clinical outcomes of DES versus BMS in patients with large coronary Methods: The study compared 134 patients (59.9±10.6 years, 90 men, 44 women) who underwent single vessel angioplasty with DESimplantation in large vessels with 115 patients (60.3±8.9 years, 82 men, 33 women) who received BMS. The clinical outcomes at 12 months were compared between groups. The study end points were major adverse cardiac events (MACE), including cardiac death, nonfatal myocardial infarction, and the need for target vessel and target lesion revascularization. Results: The baseline clinical coronary angiography and procedural characteristics were similar in both groups. The duration of dual antiplatelet therapy was longer in the DES group than in the BMS group (240±2.7 vs. 348±1.7 days, p=0.042). During the 12-month clinical follow-up, MACE were observed in 13 patients (11.3%) with BMS and 12 patients (9.0%) with DES (p=0.486). Conclusions: For coronary stents implanted in large coronary arteries, DES seems to be more favorable, although no significant differences were observed in the clinical outcomes between DES and BMS during a 1-year clinical follow-up. (Korean J Med2011;80:664-671)
영구형 심박동기 삽입 후 유의한 삼첨판 역류증 발생의 예측인자
이경진 ( Kyoung Jin Lee ),김계훈 ( Kye Hun Kim ),임이랑 ( Yi Rang Yim ),박혁진 ( Hyuk Jin Park ),이승헌 ( Seung Hun Lee ),김지은 ( Ji Eun Kim ),정형기 ( Hyung Ki Jeong ),윤현주 ( Hyun Ju Yoon ),윤남식 ( Nam Sik Yoon ),홍영준 ( You 대한내과학회 2014 대한내과학회지 Vol.86 No.5
Background/Aims: We sought to identify predictors of significant tricuspid regurgitation (TR) after successful permanent pacemaker (PPM) implantation in Korean patients. Methods: Of 404 patients who underwent PPM implantation, 187 patients who had both baseline and follow-up echocardiographic examinations were assigned to one of two groups: no development or change in TR (Group I, n = 172, 65.5 ± 13.7 years) versus the development of significant TR (Group II, n = 15, 72.1 ± 8.3 years). Clinical, laboratory, and echocardiographic variables were compared between the two groups. Results: Overall, the grade of TR was significantly aggravated from 0.46 ± 0.73 to 0.81 ± 0.84 (p < 0.001) during 3.1 ± 1.8 years of follow-up (0.49 ± 0.75 to 0.69 ± 0.74 in Group I, p < 0.001; 0.13 ± 0.35 to 2.27 ± 0.46 in Group II, p < 0.001). The de novo development or aggravation of TR was observed in 66 patients (35.3%), and significant TR developed in 15 patients (8.0%). The presence of atrial fibrillation (AF) was significantly higher (53.3 vs. 18.6%, p = 0.002), and the implantation of a ventricle pacing, ventricle sensing, inhibited by ventricular event (VVI) type pacemaker was more frequent in Group II than in Group I (46.7 vs. 15.1%, p = 0.002). Other variables were not different between the groups. Conclusions: The development or aggravation of TR was not rare after successful PPM implantation, even though the development of significant TR was uncommon. The presence of AF and the implantation of a VVI type pacemaker were predictors of the development of significant TR. Together, the results of this study suggest that the development or aggravation of TR should be monitored carefully after PPM implantation. (Korean J Med 2014;86:577-584)