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XSNP: 고성능 SoC 버스를 위한 확장된 SoC 네트워크 프로토콜
이찬호(Chanho Lee),이상헌(Sanghun Lee),김응섭(Eung-Sup Kim),이혁재(Hyuk-Jae Lee) 한국정보과학회 2006 정보과학회논문지 : 시스템 및 이론 Vol.33 No.8
최근, SoC 설계연구가 활발히 진행되고 있으며, 하나의 시스템에 보다 많은 수의 IP가 포함되고 있다. 많은 IP간의 효율적인 통신과 재사용율을 높이기 위해 다양한 프로토콜과 버스 구조들이 연구되고 있다. 기존의 공유 버스 구조의 문제점을 해결하기 위해 제안된 SNP(SoC Network Protocol)와 SNA(SoC Network Architecture)는 각각 peer-to-peer 방식의 프로토콜과 버스 구조이다. 한편 AMBA AHB는 대규모 SoC 시스템에 다소 부적절한 구조를 가짐에도 불구하고 산업 표준으로 자리매김 해왔다. 따라서 기존의 많은 IP들이 AMBA 인터페이스를 가지고 있으나 SNP와는 프로토콜과 완벽하게 호환되지 않는 문제점을 가지고 있다. 기존의 IP들의 인터페이스를 SNP로 바꾸기 전까지는 새로 제안된 버스 구조에서도 AMBA AHB와의 호환성을 완전히 배제할 수가 없다. 본 논문에서는 기존의 SNP가 확장된 XSNP(extended SNP) 스펙과 SNA 기반 시스템에서 이를 지원하는 SNA 컴포넌트를 제안한다. AMBA AHB와 SNP 사이의 프로토콜 변환을 지원하기 위해서 기존 SNP의 페이즈를 1 비트 확장하여 새로운 8개의 페이즈를 추가하였다. 따라서 AMBA 호환 가능한 IP는 SNP를 통해 성능 감쇠 없이 AHB-to-XSNP 변환기를 통해 통신할 수 있다. 또한 이러한 확장 방법은 AMBA AHB 뿐 아니라 SNP와 다른 버스 프로토콜 사이의 신호 변환에도 이용하여 SNP의 유연성과 성능을 향상시킬 수 있다. 제안된 구조의 검증/평가를 위해 다양한 시뮬레이션을 수행하였으며, AMBA AHB와의 호환성에 있어 문제가 없다는 것을 검증하였다. In recent years, as SoC design research is actively conducted, a large number of IPs are included in a system. Various bus protocols and bus architectures are designed to increase IP reusability. Among them, the AMBA AHB became a de facto standard although it is somewhat inadequate for a large scale SoC. We proposed SNP and SNA, high performance on-chip-bus protocol and architecture, respectively, to solve the problem of the conventional shared buses. However, it seems to be imperative that the new on-chip-bus system support AMBA-compatible IPs for a while since there are a lot of IPs with AMBA interface. In this paper, we propose an extended SNP specification and a corresponding SNA component to support ABMA-compatible IPs used in SNA-based system. We extend the phase of the SNP by 1 bit to add new 8 phases to support communication based on AMBA protocol without penalty of elongated cycle latency. The AHB-to-XSNP converter translates the protocol between AHB and SNP to attach AMBA-compatible IPs to SNA based system. We show that AMBA IPs can communicate through SNP without any degradation of performance using the extended SNP and AHB-to-XSNP converter.
Lee,Chanho 崇實大學校 生産技術硏究所 1995 論文集 Vol.25 No.1
Sb δ-doped Si and Ge layers were grown by si MBE(Molecular Beam Epitaxy) system using substrate temperature modulation technique. The Si substrate temperatures were modulated between 350℃ and 600℃. The doping profile was as narrow as 41Åand the doping concentration of up to 3.5×10? cm? was obtained. The film quality was as good as bulk material as verified by RHEED(Reflected High Energy Electron Diffraction), SRP(Spreading Resistance Profiling) and Hall measurement. Since the film quality is not degraded after the growth a Sb δ-doped Si layer, the δ-doped layers can be repeated as many times as we want. The doping technique is useful for many Si devices including small scale devices and those which utilize quantum mechanical effects.
ChanHo Lee,ByounGgil Yoon,HongBeom Ahn,YongSeok Kim 국제문화기술진흥원 2022 International Journal of Advanced Culture Technolo Vol.10 No.4
CPR in High-rise building is one of the challenging tasks to 119 paramedics, evacuating patient from the narrow and vertical area. This study was built to compare the method of mechanical CPR and manual CPR is to maximizing on-scene treatment time, and minimizing the hand-off time in cardiac arrest, transporting patient as fast as possible. The electronic data research (Science, Pubmed, Medline, Medline and 55 academic DB interworking) was conducted, and five articles were included by reviewing and excluding through the Covidence program and Review Manager version 5.4(Cochrane Collaboration). OHCA occurring on the higher floor indicates lower in survival. A total studies uniformly reported mechanical CPR is more effective during the high-rise building evacuation, than manual CPR in rate, depth, and hands-on time of chest compression. Use of mechanical CPR device is more suitable in case of High-rise building OHCA to improve the survival rate which is affected by high-quality CPR.
( Chanho Lee ),( Young Sam Kim ) 대한결핵 및 호흡기학회 2014 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.118 No.-
Background: Chronic obstructive pulmonary disease(COPD) has been one of the major diseases and prevalence and mortality is still increasing worldwide. Methods: Korean National Health and Nutrition Examination Survey(KNHANES) is a nationwide cross-sectional survey of the Korean population and 50,405 subjects performed health and nutritional survey during fourth and fifth KNHANES. Among them, 25,812 subjects aged over 40 years old performed spirometry and a trained interviewer administered a questionnaire on respiratory diseases and various health-related information, including educational level, residential pattern, income, smoking, and other risk factors of COPD. The educational level was classified into four groups and household income was stratified into 4 quartiles. The statistical analyses were carried out using SAS 9.3 (SAS Institute Inc.). T-test, Chi-square test and logistic regression analysis were done. Results: Data from 15,971 adults who performed spirometry adequately were used for this analysis. Of all subjects, 6,871 (43.0%) were male and 9,100 (57.0%) were female. The mean age was 56.7 for men and 57.1 for women. Prevalence of COPD, defined as FEV₁/ FVC<0.7, was 13.6% (22.7% male; 6.7% female). COPD is more prevalent in older age group, male gender, heavy smoker and lower income and educational level population. Multivariate analysis showed that older age, male gender, smoking status, and lower educational level were significant independent risk factors for COPD. The prevalence of smoker is higher and duration of smoking is longer in lower educational level group and total amount of smoking expressed as pack-year is bigger. Conclusions: Low educational level may considered as an independent risk factor of COPD in Korean adult population and further study is needed.
Smart Bus Arbiter for QoS control in H.264 decoders
Chanho Lee 대한전자공학회 2011 Journal of semiconductor technology and science Vol.11 No.1
H.264 decoders usually have pipeline architecture by a macroblock or a 4 × 4 sub-block. The period of the pipeline is usually fixed to guarantee the operation in the worst case which results in many idle cycles and higher data bandwidth. Adaptive pipeline architecture for H.264 decoders has been proposed for efficient decoding and lower the requirement of the bandwidth for the memory bus. However, it requires a controller for the adaptive priority control to utilize the advantage. We propose a smart bus arbiter that replaces the controller. It is introduced to adjust the priority adaptively the QoS (Quality of Service) control of the decoding process. The smart arbiter can be integrated the arbiter of bus systems and it works when certain conditions are met so that it does not affect the original functions of the arbiter. An H.264 decoder using the proposed architecture is designed and implemented to verify the operation using an FPGA.
Lee, Seungmin,Lee, Jiyeon,Kim, Wonhee,Kim, Hyeong-Jin,Pak, Chanho,Lee, Jung Tae,Eom, KwangSup Elsevier 2018 Journal of Power Sources Vol.408 No.-
<P><B>Abstract</B></P> <P>A selenium/carbon (Se/C) composite has been suggested as an excellent substitute cathode material due to its high theoretical volumetric capacity. However, it exhibits severe capacity decay, which is caused by the dissolution of active materials as well as s<I>huttle effect</I>. One effective strategy to alleviate this dissolution is to confine the Se within porous carbon frameworks. Here, we report the effects of carbon structure and dopant on the electrochemical performances of Se infiltrated carbon composites with three types carbons; (i) nitrogen-doped ordered mesoporous carbon (NOMC), (ii) sulfur-doped ordered mesoporous carbon (SOMC), and (iii) macroporous spherical carbon, which have different porosities and dopants. The Se/C cathodes are prepared by meting selenium-sulfur compound and then evaporating sulfur from the compound, providing nanoscale space for efficient electrolyte access to the reaction site. Among the three composite cathodes, the Se/NOMC exhibits the highest rate-capability and cyclic stability due to an abundance of cylindrical mesopores (4–5 nm pore diameter) that can provide enough electrolyte diffusion path and effectively impede the dissolution of selenium. As a result, the Se/NOMC has a high volumetric capacity of 1605 mAh cm<SUP>−3</SUP> and excellent capacity retention of 100% during 500 cycles at 0.648 A h cm<SUP>−3</SUP> (C-rate of C/2.5).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Three-types of selenium/carbon (Se/C) cathodes for LiSe battery are prepared. </LI> <LI> They have three carbon frameworks with different structure and dopant. </LI> <LI> The ordered mesoporous carbon (OMC) improves rate-capability of Se/C cathode. </LI> <LI> The Se/C cathode with N-doped OMC delivers the excellent cyclic stability. </LI> <LI> The lithiated Si/Gr– Se/NOMC full-cell demonstrates promising cyclic stability. </LI> </UL> </P>