• 제목/요약/키워드: GB25

검색결과 196건 처리시간 0.028초

단방향 경로 스위칭 링을 위한 경로 제어 스위치 소자 (A Path Control Switch Chip for an Unidirectional Path Swithced Ring)

  • 이상훈
    • 한국통신학회논문지
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    • 제24권8A호
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    • pp.1245-1251
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    • 1999
  • 1.25Gb/s 처리용량의 디지털 신호들의 경로를 제어하는 스위치 소자가 COMPASS 툴로 설계되었고 0.8$\mu\textrm{m}$ CMOS 게이트 어레이로 LG 반도체에서 제작되었다. 이 소자는 초고속국가망의 전송노드 역할을 하는 SDH 전송 시스템에서 디지털 종속신호들의 자기복구동작을 가능하게 한다. 본 논문에서 제안한 경로 제어 스위치 소자는 SDH 선형 전송망과 단방향 링과 같은 환형 전송망에도 적용 가능한 구조로 설계되었다. 경로 제어 스위치 소자의 자기복구동작은 스위치내의 데이터 레지스터에 저장된 설정 데이터들을 변경시킴으로 이루어진다. SDH 전송시스템에의 적용시험 결과, 이 소자는 임의의 광선로 장애 시 즉시 복구가 가능함을 보여 주었으며 BER 10-11~10-12 정도로 양호하게 동작됨이 검증되었다. 2개의 동일한 혹은 그 이상의 스위치를 병렬구조로 구성하면 2.5Gb/s 혹은 그 이상의 처리용량도 얻을 수 있다.

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800Gb/s ATM 스위칭 MCM의 성능분석 (Performance Analysis of 800Gb/s ATM Switching MCM)

  • 정운석;김훈;박광채
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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    • pp.155-158
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    • 2001
  • A 640Gb/s high-speed ATM switching system that is based on the technologies of advanced MCM, 0.25um CMOS and optical WDM interconnection is fabricated for future N-ISDN services. A 40 layer, 160mm$\times$114mm ceramic MCM realizes the basic ATM switch module with 80Gbps throughput. The basic unit ATM switch module with 80Gb/s throughput. The basic unit ATM switch MCM consists of in 8 chip advanced 0.25um CMOS VLSI and 32 chip I/O Bipolar VLSIs. The MCM employs an 40 layer, very thin layer ceramic MCM and a uniquely structured closed loop type liquid colling system is adopted to cope with the MCM's high-power dissipation of 230w. The MCM is Mounted on a 32cm$\times$50cm mother board. A three stage ATM switch is realized by optical WDM interconnection between the high-performance MCM.

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Electroabsorption modulator-integrated distributed Bragg reflector laser diode for C-band WDM-based networks

  • Oh-Kee Kwon;Chul-Wook Lee;Ki-Soo Kim
    • ETRI Journal
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    • 제45권1호
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    • pp.163-170
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    • 2023
  • We report an electroabsorption modulator (EAM)-integrated distributed Bragg reflector laser diode (DBR-LD) capable of supporting a high data rate and a wide wavelength tuning. The DBR-LD contains two tuning elements, plasma and heater tunings, both of which are implemented in the DBR section, which have blue-shift and red-shift in the Bragg wavelength through a current injection, respectively. The light created from the DBR-LD is intensity-modulated through the EAM voltage, which is integrated monolithically with the DBRLD using a butt-joint coupling method. The fabricated chip shows a threshold current of approximately 8 mA, tuning range of greater than 30 nm, and static extinction ratio of higher than 20 dB while maintaining a side mode suppression ratio of greater than 40 dB under a window of 1550 nm. To evaluate its modulation properties, the chip was bonded onto a mount including a radiofrequency line and a load resistor showing clear eye openings at data rates of 25 Gb/s nonreturn-to-zero and 50 Gb/s pulse amplitude modulation 4-level, respectively.

양릉천(陽陵泉) 우슬(牛膝) 약침이 흰쥐의 고지혈증에 미치는 영향 (The Effect of Achyranthis Radix Herbal-acupuncture on Hyperlipidemia in Rats)

  • 최준수;임윤경;이병렬;양기영;김재규
    • Korean Journal of Acupuncture
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    • 제27권3호
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    • pp.25-46
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    • 2010
  • Objective & Methods : The purpose of this study is to observe the effects of herbal- acupuncture with Achyranthis Radix(AR-HA) at GB34(Yangleungchean) on hyperlipidemia in rats. The author performed several experimental items to analyze the levels of various components and enzymes in serum and liver, as well as the histological changes of liver and aorta. Results : 1. Achyranthis Radix herbal acupuncture solution increased DPPH radical scavenging activity and HMG-CoA reductase inhibition rate in rat liver cells. 2. AR-HA at GB34 decreased the level of serum total cholesterol, and increased the ratios of HDL-cholesterol to total cholesterol, phospholipid to total cholesterol in hyperlipidemic rat. 3. AR-HA at GB34 decreased the hepatic HMG-CoA reductase activity in hyperlipidemic rat. 4. AR-HA at GB34 increased the hepatic GSH level in hyperlipidemic rat. Conclusion : From the above results, it is suggested that AR-HA at GB34 has a therapeutic effect on hyperlipidemia.

기가비트 이더넷용 CMOS 전치증폭기 설계 (CMOS Transimpedance Amplifiers for Gigabit Ethernet Applications)

  • 박성민
    • 대한전자공학회논문지SD
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    • 제43권4호
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    • pp.16-22
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    • 2006
  • 본 논문에서는 CMOS 공정을 사용하여 기가비트 이더넷 응용을 위한 전치증폭기 회로를 구현하였다 대역폭 확장 및 노이즈 성능개선을 위해, regulated cascade 설계기법을 사용하였고 이로써, 광다이오드 및 TIA 입력단의 큰 기생 캐패시턴스를 대역폭 결정으로부터 효과적으로 차단하였다. 0.6um CMOS공정을 사용하여 구현한 1.25Gb/s 전치증폭기의 칩 측정 결과 58dBohm의 트랜스 임피던스 이득, 0.5pF 기생 광다이오드 캐패시턴스에 대해 950MHz의 대역폭과 6.3pA/sqrt(Hz)의 평균 노이즈 전류 스펙트럼 밀도, 5V 단일 전원전압으로부터 85mW의 전력소모를 보였다. 또한, 0.18um CMOS 공정을 사용하여 설계한 10Gb/s 전치증폭기는 RGC 기법과 인덕티브 피킹기술을 동시에 사용함으로써, 59.4dBohm의 트랜스 임피던스 이득, 0.25pF 기생 캐패시턴스에 대해 8GHz의 대역폭, 20pA/sqrt(Hz)의 노이즈 전류 스펙트럼 밀도, 1.8V 단일전압에 대해 14mW의 전력소모를 보였다.

골절에 침 치료를 적용한 2013년 이후 증례보고 문헌고찰 (A Review of Case Reports on the Application of Acupuncture as a Treatment for Fracture since 2013)

  • 백승원;남경호;최승관;이정한;한윤희
    • 한방재활의학과학회지
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    • 제31권4호
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    • pp.49-63
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    • 2021
  • Objectives This study aimed to investigate the trend in treating fracture with acupuncture and to evaluate the quality of case reports. Methods All case reports of fractures treated with acupuncture were extracted from four Korean web databases. We classified these studies by five fracture sites and investigated frequently used meridian and acupoint, outcome measurements, treatment period. And we assessed the quality of the case reports by the STandards for Reporting Interventions in Clinical Trials of Acupuncture (STRICTA) guidelines. Results A total of 33 case reports were included. The outcome measurements were divided into six categories, and the outcome measurements used in more than three studies showed improvement in patient symptoms. The mainly used meridians for each fracture site were as follows: chest and abdomen (GB, LR, CV), back (BL, GB), upper limb (LI, TE), lower Limb (GB, ST, BL, SP). The most commonly used acupoints for each fracture site were as follows: chest and abdomen (Ashi points, GB24, GB25, GB26, LR13, LR14, CV16, CV17, CV18, CV19), back (BL23, BL24, BL25, BL26, BL40, BL51, BL52, BL60, GB34), upper limb (LI4, LI10, LI11, TE3), lower limb (GB34, GB40). According to the STRICTA guidelines, more than 54.54% of the reports were found to be 'not reported' or 'not sufficient' in the following categories: 'response sought', 'description of participating acupuncturist', and 'number of needle insertions per subject per session'. Conclusions The meridians and acupuncture points frequently used for acupuncture treatment of fractures were near the fracture site. Future clinical studies involving acupuncture must be reported in accordance with the STRICTA guidelines to improve transparency and uniformity.

광WDM 인터커넥션에서 AWG 라우터의 특성 연구 (A Study on Characteristic of AWG Router in Optical WDM Interconnections)

  • 김훈;최현호;박광채
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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    • pp.375-378
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    • 2001
  • A 640Gb/s very advanced ATM switching system using 0.25um CMOS VLSI, 40 layer ceramic MCM and 10Gb/s, 8 wavelength 8$\times$8 optical WDM interconnection has been fabricated. To break though the interconnection bottleneck, optical WDM interconnection is used. It has 20Gb/s 8 wavelength 8$\times$8 interconnection capability. It realizes 640Gb/s interconnections within a very small size. Preliminary tests show that 800b1s ATM switch MCM and optical WDM interconnection technologies can be applied to future high speed broadband networks

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3-Gb/s 60-GHz Link With SiGe BiCMOS Receiver Front-End and CMOS Mixed-Mode QPSK Demodulator

  • Ko, Min-Su;Kim, Du-Ho;Rucker, Holger;Choi, Woo-Young
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제11권4호
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    • pp.256-261
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    • 2011
  • We demonstrate 3-Gb/s wireless link using a 60-GHz receiver front-end fabricated in $0.25-{\mu}m$ SiGe:C bipolar complementary metal oxide semiconductor (BiCMOS) and a mixed-mode quadrature phase-shift keying (QPSK) demodulator fabricated in 60-nm CMOS. The 60-GHz receiver consists of a low-noise amplifier and a down-conversion mixer. It has the peak conversion gain of 16 dB at 62 GHz and the 3-dB intermediate-frequency bandwidth of 6 GHz. The demodulator using 1-bit sampling scheme can demodulate up to 4.8-Gb/s QPSK signals. We achieve successful transmission of 3-Gb/s data in 60 GHz through 2-m wireless link.

Clinical Application of Functional MRI : Motor Cortex Activities by Acupuncture

  • Choe, Bo-Young
    • 한국자기공명학회:학술대회논문집
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    • 한국자기공명학회 2002년도 International Symposium on Magnetic Resonance
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    • pp.21-25
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    • 2002
  • We report a preliminary fMRI evidence of modulation of somatomotor areas by acupuncture in GB34 acupoint. GB34, located in the back of the knee, is known to be effective in recovering motor function after stroke. Using 3T MR scanner, functional MR imaging was performed in five normal volunteers in two stimulation paradigms; acupuncture manipulation on GB34 and sham points. Group analysis from five individuals showed that bilateral sensorimotor areas (BA 3,4,6 and 7) showed stimulation related BOLD signal contrast of approximately 6% whereas very few areas were activated when sham stimulation is given. Our results suggest that acupuncture fMRI study can be safely conducted in 3T environment, and stimulation in GB34 modulate the cortical activities of the somatomotor area in human.

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10GbE 스위치간 링크 집합을 위한 프레임 분배방식 (Frame Distribution Methods for Link Aggregation between 10GbE Switches)

  • 이호영;이숭희;김연수;조현성
    • 한국정보과학회:학술대회논문집
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    • 한국정보과학회 2003년도 봄 학술발표논문집 Vol.30 No.1 (C)
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    • pp.25-27
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    • 2003
  • 본 논문은 10GbE로의 망 전개에 따라 구현될 l0Gb 스위치에 필요한 계층2 부가서비스들 중에서 여러개의 물리적인 링크를 하나의 논리적인 링크로 집합하여 대역폭의 증가를 가져오는 링크 집합(Link Aggregation) 기술에 필요한 프레임 분배방식에 대한 것이다. 링크 집합 기술은 분배 알고리즘의 설계에 따라 스위치에서 성능의 차이를 가져오므로 링크 집합의 장정을 살리려면 종은 성능을 가지는 분배 알고리즘이 필요하다. 우선 링크 집합의 간단한 구현 방법을 살펴보고 기존에 제시된 스위치와 스위치 사이에서의 프레임 분배방식인 정적/동적 프레임 분배 방식과 우리가 새로이 제안한 패딩을 이용한 분배방식을 비교한 후, 정적/동적 프레임 분배 방식과 패딩을 이용한 분배방식을 컴퓨터 시뮬레이션을 통해 성능을 비교하였다.

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