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장주석 대구보건대학 1991 대구보건대학 論文集 Vol.12 No.-
In this paper, designed and implemented the integral Central Control System which controls and analyze peripheral devices and machines by means of a personal computer system and micro computer systems. Overall design structure is based on the tightly coupled multi-processor system which communictes with other processor by way of common memory, and implementing system is consisted of a IBM PC/XT computer system and constructed micro computer systems which using Z-80 cpu. On the software, we adapted Separative Executive operating system mechanism which operate independantly at each unit, and in the actual system, used MS-DOS in the IBM PC/XT(MASTER) and developed monitor program in the micro-computer systems(SLAVE). A IBM PC/XT computer system(MASTER) controls all over the SLAVE units and micro-computer system(SLAVE) controls connected outer devices and machines and sends occurred data from outers to central system and receives commands from central system. The mutual exclusion which occurs in the muti-processor system when data are communicateed with each unit by means of the common memory is resolved by the use of Dekker's Algorithm. On the result of this multiprocessor Integral. Central control system, all outer devices and machines are directly controled by the SLAVE and statistical process is resolved by the MASTER, and so this system's function would be very excellent for the integral real time processing.
이상적인 디스크형 3차원 홀로그래픽 메모리에서의 면적 저장밀도
장주석,신동학 한국광학회 2000 한국광학회지 Vol.11 No.1
Assuming that the performance of holographic storage media is ideal, we estimate the area storage density of disk-type holographic memories, when the method of either angle multiplexing, or rotational multiplexing, or both are used. The area storage density is strongly dependent on the f numbers (ratio of focal length to diameter) of both the Fourier transform lens in the signal arm, denoted by $F/#_2$, and the angle range over which the reference beam is incident (or, the equivalent f number corresponding to the angle range denoted by $F/#_1$). The area storage density is largely independent of the pixel pitch of the spatial light modulator when the Fourier plane holograms are recorded, while it is sensitive to the pixel pitch when the image plane holograms are recorded. In general, to obtain high area storage density, the Fourier or at least near Fourier plane holograms rather than the image plane holograms should be recorded. In addition, when the thickness of the recording materials are less than approximately $500\mu\extrm{m}$, rotational multiplexing gives higher area storage densities than angle multiplexing does. To increase the storage density further, however, it is desirable to use both of the two multiplexing methods in combination.nation. 홀로그램 기록 매질의 성능이 이상적이라 가정할 때, 각다중이나 회전다중 또는 그 두 가지를 모두 사용하는 경우에 있어서, 디스크형 홀로그래픽 메모리에서의 면적 저장 밀도를 산출하여 비교하였다. 이때 면적 저장 밀도는 신호빔에 사용되는 Fourier 변환 렌즈의 f 수(초점거리/직경, $F/#_2$)와 각다중을 위한 기준빔의 입사각 범위(또는 이 각 범위에 대응하는 등가적인 f수, $F/#_1$)에 크게 의존된다. Fourier 면 홀로그램을 기록할 경우, 면적 저장밀도는 공간 광 변조기의 픽셀 크기에는 큰 영향을 받지 않지만, 영상면 홀로그램을 기록할 경우, 이 픽셀 크기에 직접적으로 영향을 받는다. 일반적으로 높은 면적 저장 밀도는 얻기 위해서는 영상면보다 Fourier 면(또는, 적어도 Fourier면 근처)에서 홀로그램을 기록하는 것이 유리하다. 또 저장 매질의 두께가 대략 $500\mu\ extrm{m}$이하일 때에는 각다중보다 회전다중 방식이 더 높은 면적 저장 밀도를 주었다. 그러나, 저장매질의 두께와 관계없이 면적 저장밀도를 더욱 높이기 위해서는, 각다중과 회전다중 방식을 복합적으로 사용할 필요가 있음을 알 수 있었다.
장주석,박진상,지창환,정신일 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.5
As a Basic study to implement a wide-band photonic switching sysetm, we proposed a scheme of free-space-division-multiplexed photonic switching based on a holographic interconnectio method and carried out simple experiments on it. First, we recorded holgraphic interconnection element array for nonblocking optical interconnections. Just a single stage of the array realizes full optical interconnections between NN${\times}$NN input prots and NN${\times}$NN output ports in 3-D space. Next, in reading of the array for optical internnections, we showed that the zeroth-order diffacted beam could be eliminated in the output port by introducing a right angle prism. The elimination of the zeroth-order diffracted beam reduces optical noise in the output ports and provides conveniences of interconnection control in our scheme. Finally, from the experiments on ON-OFF switching of the optical interconnection paths one by one using a spatial (display of the liquid crystal telecision), we showed the feasibility of photonic wsitching based on the holographic interconnection method. We also estimated approximately the maximum interconnectio scale that can be realized without difficulty with current optical devices.
장주석,김명원,임채덕,송윤선 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.1
Coloring기법을 이용한 향상된 5-셀 PNPSF 테스트 알고리즘
장주석,윤태진 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)
State-of-the-art memory chips are designed with spare rows and columns for reconfiguration purposes. After a memory chip is reconfigured, Physically adjacent cells may no longer have consecutive logical addresses. In this paper, we present new test algorithms to detect 5-cell Physical neighborhood pattern sensitive faults in dynamic RAMs, even if the logical and physical addresses are different and the physical-to-logical address mapping is not available. These algorithms have test length of O(N[log_2N][log_3N]^2) for N-bit RAMs, and also detect other faults such as stuck-at and coupling faults. The algorithms depend on the 3-coloring algorithm that trichromatically colors all the triplets among a group on n object in at most [log_3N]^2 coloring steps and 2-coloring algorithm that differently colors all the pairs among a group of n object in at most [log_2N] coloring step.