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A Link Layer Design for DisplayPort Interface
진현배,윤광희,김태호,장지훈,송병철,강진구 한국전기전자학회 2010 전기전자학회논문지 Vol.14 No.4
This paper presents a link layer design of DisplayPort interface with a state machine based on packet processing. The DisplayPort link layer provides isochronous video/audio transport service, link service, and device service. The merged video, audio main link, and AUX channel controller are implemented with 7,648 LUTs(Loop Up Tables), 6020 register, and 821,760 of block memory bits synthesized using a FPGA board and it operates at 203.32MHz.
진현배,문용환,장지훈,김태호,송병철,강진구,Jin, Hyun-Bae,Moon, Yong-Hwan,Jang, Ji-Hoon,Kim, Tae-Ho,Song, Byung-Cheol,Kang, Jin-Ku 한국전기전자학회 2011 전기전자학회논문지 Vol.15 No.2
본 논문은 디스플레이포트의 보조채널에서 고속 데이터 전송을 할 수 있는 고속 양방향 보조 채널을 구성하기 위한 새로운 송 수신기 구조를 제안하고 적용에 대해 서술하였다. 제안된 고속 보조 채널은 저속 전송에서 맨체스터 인코딩을 사용하여 1Mbps대역폭을, 고속 전송에서 8B/10B인코딩 방식을 사용하여 720Mbps의 대역폭을 지원한다. 맨체스터 전송을 사용하여 고속 보조채널 및 메인링크의 링크 서비스 및 디바이스 서비스를 위한 저속 보조채널 블록을 제안하고, 8B/10B인코딩 방식을 통하여 보조채널을 통한 고속 데이터 전송을 위한 블록을 제안한다. 또한 데이터 패킷 구조와 데이터 전송방식에 대하여 정의하였다. 설계된 시스템은 Verilog HDL로 설계 되었으며, 고속 보조채널 송 수신기는 Xilinx Vertex4 FPGA을 사용하여 합성한 결과 7,648개의 LUTs와 6,020개의 registers를 사용 하였으며, 최대 동작 속도는 203MHz의 성능을 확인 하였다. This paper presents the design of a fast auxiliary channel bus for DisplayPort 1.2 interface. The fast auxiliary channel supports Manchester transactions at 1Mbps and fast auxiliary transactions at 780Mbps. The Manchester transaction is used for managing the main link and auxiliary channel and the fast auxiliary transaction is for data transfer via the auxiliary channel. Simplified serial bus architecture is proposed to be implemented in fast auxiliary channel. The fast auxiliary channel transmitter and receiver are implemented with 7,648 LUTs and 6,020 slice register synthesized in Xilinx Vertex4 FPGA and can be operated at 72MHz to support 720Mbps.
버니어 지연단을 이용한 26ps, 8비트 게이티드 링 오실레이터 시간-디지털 변환기의 설계
진현배(Hyun-Bae Jin),박형민(Hyung-Min Park),김태호(Tae-Ho Kim),강진구(Jin-Ku Kang) 大韓電子工學會 2011 電子工學會論文誌-SD (Semiconductor and devices) Vol.48 No.2
본 논문에서는 디지털 위상고정루프(All-digital PLL)를 구성하는 핵심 블록인 시간-디지털 변환기(Time-to-Digital Converter)를 제안하고 구현하였다. 본 연구에서는 게이티드 링 오실레이터 시간-디지털 변환기(GRO-TDC)의 기본 구조에 버니어 지연단(VDL)을 이용하여 다중 위상을 얻음으로써 보다 높은 해상도를 얻을 수 있는 구조를 제안하였다. 게이티드 링 오실레이터(GRO)는 총 7개의 지연셀을 사용하였고, 버니어 지연단(VDL) 3단을 이용하여 총 21개의 다중 위상을 사용하여 시간-디지털 변환기(TDC)를 설계하였다. 제안한 회로는 0.13㎛ 1P-6M CMOS 공정을 사용하여 설계 및 구현하였다. 측정결과, 제안한 시간-디지털 변환기(TDC)의 최대 입력 주파수는 100㎒이고, 해상도는 26㎰로 측정되었으며, 출력은 8-비트이며, 검출이 가능한 최대 위상 차이는 5㎱의 위상 차이까지 검출이 가능하였다. 전력 소비는 측정된 Enable 신호의 크기에 따라 최소 8.4㎽에서 최대 12.7㎽로 측정되었다. This paper presents a Time-to-Digital Converter which is a key block of an All-Digital Phase Locked Loop. In this work, a Vernier Delay Line is added in a conventional Gated Ring Oscillator, so it could get multi-phases and a high resolution. The Gated Ring Oscillator uses 7 unit delay cell, the Vernier Delay Line is used each delay cell. So proposed Time-to-Digital Converter uses total 21 phases. This Time-to-Digital Converter circuit is designed and laid out in 0.13㎛ 1P-6M CMOS technology. The proposed Time-to-Digital Converter achieves 26㎰ resolution, maximum input signal frequency is 100㎒ and the digital output of proposed Time-to-Digital Converter are 8-bits. The proposed TDC detect 5㎱ phase difference between Start and Stop signal. A power consumption is 8.4∼12.7㎽ depending on Enable signal width.
Spiral casing of a volute centrifugal pump- Effects of varying the cross-sectional area -
손창호,진현배,김명진,정의준 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
The impeller and the spiral casing are the key components of a centrifugal pump. Many studies have investigated the impeller, but further research of the spiral casing is needed to improve the performance of centrifugal pumps. The current study uses numerical analysis to investigate the effect of cross-sectional area on the performance of the spiral casing. The accuracy of the analysis is improved by conducting it for all operating points using complete geometry through transient analysis, which has the advantage of simulating realistic flow.
족무지 외반증에서 $60^{\circ}$ 원위부 갈매기형 절골술과 $40^{\circ}$ 원위부 갈매기형 절골술 간의 방사선학적 비교
라종득,박현수,임창석,장영수,전용수,진현배,김경훈,Rha, Jong-Deuk,Park, Hyun-Soo,Lim, Chang-Suk,Jang, Young-Soo,Jeon, Yong-Soo,Jin, Hyun-Bae,Kim, Kyung-Hun 대한족부족관절학회 2005 대한족부족관절학회지 Vol.9 No.2
Purpose: We made a radiological comparison between $60^{\circ}$ distal Chevron osteotomy with short armed two parts and $40^{\circ}$ distal Chevron osteotomy with long armed one part performing operation in cases of hallux valgus angle of less than $40^{\circ}$, intermetatarsal angle of less than $15^{\circ}$. Materials and Methods: 12 cases with $60^{\circ}$ distal Chevron osteotomy and 12 cases with $40^{\circ}$ distal Chevron osteotomy were selected from October 2000 to March 2005. We have analysed the hallux valgus angle, 1-2 intermetatarsal angle, metatarsal length, distal metartarsal articular angle and angulation at osteotomy site on lateral view in each radiological films taken at preoperative, postoperative and 3 months after operation presuming bone union. All cases were women, both sides were 9 cases and average age was 52.3 years old. Results: Data taken at preoperative, postoperative and 3 months follow up films in $60^{\circ}$ distal Chevron osteotomy were as follows; the hallux valgus angles were $32.1^{\circ}$, $10.9^{\circ}$, $13.8^{\circ}$, the 1-2 intermetatarsal angles were $13.6^{\circ}$, $8.5^{\circ}$, $8.4^{\circ}$, the metatarsal length were 60.6 mm, 58.8 mm, 58 mm, the distal metartarsal articular angles were $13^{\circ}$, $6^{\circ}$, $6.6^{\circ}$ and 3 cases were over $3^{\circ}$ angulation at lateral view. In $40^{\circ}$ distal Chevron osteotomy, the hallux valgus angles were $34.5^{\circ}$, $11.6^{\circ}$, $15.3^{\circ}$, the 1-2 intermetatarsal angles were $12.7^{\circ}$, $8.2^{\circ}$, $7.8^{\circ}$, the metatarsal length were 59.2 mm, 56.9 mm, 55.9 mm, the distal metartarsal articular angles were $12^{\circ}$, $7.3^{\circ}$, $7.3^{\circ}$ and there were no case with angulation over $3^{\circ}$ at lateral view. Conclusion: In comparison between $60^{\circ}$ distal Chevron osteotomy and $40^{\circ}$ distal Chevron osteotomy measuring at postoperative and follow up, most of all data were similar, but 3 cases over $3^{\circ}$ angulation at lateral view happened in $60^{\circ}$ Chevron osteotomy. This result showed that $40^{\circ}$ distal Chevron osteotomy fixing with screws through long armed one part may have benefit than $60^{\circ}$ distal Chevron osteotomy fixing with K-wires through short armed two parts in making rigid fixation, even though there is a personal difference of technigue.