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서기범,정정화,Seo, Gi-Beom,Jeong, Jeong-Hwa 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.3
본 논문에서는 MPEG-2 비디오 인코더의 프레임 인터페이스 모듈에 대한 효율적인 하드웨어 구조를 제안한다. 인코더 모듈과 SDRAM 사이의 메모리 버퍼 크기를 줄이기 위해, 한 매크로 블록에 필요한 메모리액세스 시간을 dual-bank 동작과 버스트 길이 변화를 사용하여 필요 클럭 수를 최소화 한다. 이 최소화된 메모리 액세스 방법으로 인해 남는 클럭 사이클을 랜덤 액세스 횟수로 할당함으로써, 내부버퍼 크기, 데이터버스의 폭과 제어논리회로의 크기를 줄일 수 있었다. 제안된 프레임 메모리 모듈은 54㎒의 주파수에서 동작하며 설계된 라이브러리는 VTI/sup тм/ 0.5㎛ CMOS TLM 표준셀공정을 사용하였다. 제안된 구조를 C-code하드웨어 모델에 의해 생성된 테스트 벡터와 합성된 회로의 모의실험 결과를 비교함으로써 검증하였다. 제안된 구조의 버퍼 면적은 기존 구조의 버퍼 면적의 40%로 줄일수 있었다. This paper presents an efficient hardware architecture of frame memory interface in MPEG-2 video encoder. To reduce the size of memory buffers between SDRAM and the frame memory module, the number of clocks needed for each memory access is minimized with dual bank operation and burst length change. By allocating the remaining cycles not used by SDRAM access, to the random access cycle, the internal buffer size, the data bus width, and the size of the control logic can be minimized. The proposed architecture is operated with 54MHz clock and designed with the VT $I^{тм}$ 0.5 ${\mu}{\textrm}{m}$ CMOS TLM standard cell library. It is verified by comparing the test vectors generated by the c-code model with the simulation results of the synthesized circuit. The buffer area of the proposed architecture is reduced to 40 % of the existing architecture.
LTE-R 기술을 적용한 입환진로표시기 무선제어시스템 연구
서기범,임철후,이광희,어성욱,정왕국,Suh, Ki-Bum,Im, Chul-Hoo,Lee, Kwang-Hee,Oa, Seong-Wook,Joeng, Wang-Kuk 대한전기학회 2017 전기학회논문지 Vol.66 No.1
The railway has recently been expanded with the phase of the future transportation. Accordingly, using the new technologies such as smart devices and LTE-R, the needs for reducing operational costs and improving passenger services have emerged. To realize these needs, the government is pushing to build the dedicated wireless network for the railway systems. In this paper, the shunting route indicator was selected for this study because it has the best effect for the wireless system removed lots of wired cables. And the wireless shunting route indicator applied with LTE-R technology was developed to replace the current wired control system. The functional goal(the wireless control function applied LTE-R), the performance goal(less than 300ms for transferring the control information), and the reliability goal(over the 100,000 hours for MTBF) were set, and these goals were achieved and demonstrated through the test and validation.
헬륨 - 네온 레이저 조사가 단층 ( monolayer ) 과 교원질 격자 ( Collagen lattice ) 에 배양한 인체 섬유모세포의 증식과 교원질 합성에 미치는 영향
서기범,윤소영,이우재,이증훈,박장규 (Ki Beom Suhr,So Young Yoon,Woo Jae Lee,Jeung Hoon Lee,Jang Kyu Park) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.2
Background: Recently it has been suggested that lasers can modulate the biological functions of cells in vitro. It has also been reported that a helium-neon(He-Ne) laser can stimulate wound healing in the absence of thermal effects. However, the results of more recent studies on the influence of He-Ne laser irradiation on the proliferation and collagen synthesis of human dermal fibroblasts have been inconclusive. And most experiments have not been performed in a three-dimensional collagen lattice that is the physiologic model for an in vitro experiment. Objective : In this study we have investigated the nature of the influence of He-Ne laser irradiation on the proliferatior and collagen synthesis of human dermal fibroblasts cultured in a monolayer and collagen lattice. Methods : We used a 10mW He-Ne laser emitting a beam of wavelength 632,8nm. The human dermal fibroblasts were subjected to laser treatment at various energy densities, and the treatment schedule included one daily exposure on three consecutive days. DNA replication was assessed by H-thymidine incorporation, and the collagen production was monitored by the synthesis of H-hydroxyproline following incubation of the culture with H-proline. Results : The results were as follows : In the control group, the proliferation and collagen synthesis of fibroblasts sultured in a collagen lattice on day 4 and 7 were significantly reduced compared with conventional manolayer cultures. Although the proliferation of human dermal fibroblasts was not remarkable in all experimental irradiation energy except 4 J/cm in a monolayer culture, a statistically significant stimulating effect on fibroblasts proliferation in collagen lattice were noted on days 4 and 7 with an energy density of 1.5J/cm. And we also found that a great er increase of collagen synthesis of human dermal fibroblasts occurred in a monolayer culture on days 4 and 7 in all irradiated energy densities than those in a collagen lattice culture. But statistically significant enhancement of collagen synthesis was showed only at the energy density of 1 J/cm in a collagen lattice culture on days 4. Conclusion : These data indicated that the influence of He-Ne laser irradiation on the proliferation and collagen synthesis of human dermal fibroblasts cultured in a collagen lattice was remark ably different from those in a monolayer culture. In the clinical application of the He-Ne laser, the control of the amount of irradiation of the He Ne laser may regulate the proliferative activity and collagen synthesis of human dermal fibroblasts in wound healing. (Kor J Dermatol 1996;34(2): 279-288)