• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.949-952
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• 2005

We propose the hardwired distributed arithmetic which is applied to multiple constant multiplications and the fixed data path in the inner product of fixed coefficient as a result of variable radix-2 multi-bit coding. Variable radix-2 multi-bit coding is to reduce the partial product in constant multiplication and minimize the number of addition and shifts. At results, this procedure reduces the number of partial products that the required multiplication timing is shortened, whereas the area reduced relative to the DA architecture. Also, this architecture shows the best performance for DCT/IDCT and DWT architecture in the point of area reduction up to 20% from reducing the partial products up to 40% maximally.

• 소성∙가공
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• 제3권1호
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• pp.38-50
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• 1994

Fundamental deformation mechanism and plastic behavior of AISI304 austenitic stainless steel were investigated to evaluate press formability. Local and uniform deformation capacity of AISI304 steel were compared to those of ferritic AISI430 steel and Al killed low carbon steel. Nine kinds of austenitic stainless steels having different austenite stabilities were made in laboratory scale to examine the transformation behavior in various deformation mode and variation of mechanical properties. Deformation path and strain distributions along edge corner of commercial sink die were illustrated and effect of austenite stability on press forming of sink die was clarified with experiments using square cup drawing tools.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.671-674
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• 2000

In this paper, we present a robust global registration algorithm for multi-frame image mosaics. When we perform a pair-wise registration recovering a projective transformation between two consecutive frames, severe mis-registration among multiple frames, which are not consecutive, can be detected. It is because the concatenation of those pair-wise transformations leads to global alignment errors. To overcome those mis-registrations, we propose a new algorithm using multiple frames for constructing image mosaics. We use a graph to represent the temporal and spatial connectivity and show that global registration can be obtained through the search for an optimal path in the constructed graph. The definition of an adequate objective function characterizing the global registration provides a direct manipulation of the graph. In the presence of moving objects, especially large ones compared with low texture backgrounds, by using the likelihood ratio as the objective function, we can deal with some of the most challenging videos like basketball or soccer Moreover, the algorithm can be parallelized so it can be more efficiently implemented. Finally, we give some experimental results from real videos.

• 한국지능시스템학회논문지
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• 제10권5호
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• pp.478-486
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• 2000

본 논문에서는 CMOS 디지털 회로상의 플립플롭의 위치를 이동시키는 리타이밍 변환에 유전자 알고리즘을 적용하여 회로의 최적 동작 속도를 유지하면서 전력의 소모를 줄일 수 있는 설계 방법을 제안한다. 제안된 설계 방법은 최적 속도를 구현하는 리타이밍 단계와 유전자 알고리즘이 적용되는 저전력 리타이밍의 두 단계로 이루어진다. 제안된 저전력 리타이밍 설계 도구를 예제 회로의 설계에 적용하고 설계된 회로의 성능을 Synopsys시의 Design Analyzer로 평가한 결과, 임계 경로 지연은 약 30~50% 가량 감소하였으며 동적 전력 소모는 약 1.4~18.4% 가량 감소함을 관찰하였다.

• 전자공학회논문지A
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• 제33A권2호
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• pp.122-130
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• 1996

In an effort to learn more about the reaction mechanisms which lead to the compound nucleation at the interface of cobalt and silicon, electrical noise properties has been investigated for cobalt thin films deposited on silicon substrates by the electron beam evaporation and rf sputtering techniques. Microstructural variations at the Co/Si interfaces have been observed by transmission electronmicroscopy. Amorphous structures are observed at the Co/Si interfaces for samples whose cobalt thicknesses are less than 4nm and a polycrystalline compound nucleation has been occurred for thicker films. 1/f noise power same samples, and the spetral density has been normalized. The amplitude of 1/f noise power spectral density shows a gradual increase as the cobalt thickness is increased, and the amplitude has dropped abruptly after the compound nucleation. The variations of the noise parameters areassumed to be an indiction of the phase transformation along the nucleation reaction path, and amplitude has been interpreted as instabilities of the Co/Si interfacial structures.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 춘계학술대회 논문집
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• pp.127-132
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• 1992

To relize the future intelligent robot the development of a special-purpose processor for a coordinate transformation is evidently challenging task. In this case the complexity of a hardware architecture strongly depends on the adopted algorithm. In this paper we have used an inverse kinemetics algorithm based on incremental unit computation method. This method considers the 3-axis articulated robot as the combination of two types of a 2-axis robot: polar robot and 2-axis planar articulated one. For each robot incremental units in the joint and Cartesian spaces are defined. With this approach the calculation of the inverse Jacobian matrix can be realized through a simple combinational logic gate. Futhermore, the incremental computation of the DDA integrator can be used to solve the direct kinematics. We have also designed a hardware architecture to implement the proposed algorithm. The architecture consists of serveral simple unitsl. The operative unit comprises several basic operators and simple data path with a small bit-length. The hardware architecture is realized byusing the EPLD. For the straight-line motion of the KAIST arm we have obtained maximum end effector's speed of 12.6 m/sec by adopting system clock of 8 MHz.

• 한국연초학회지
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• 제21권2호
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• pp.152-159
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• 1999

A CAB cDNA clone(pKGCAB) encoding the light harvesting chlorophyll a/b binding protein of the semi-shade plant, Korean ginseng(Panax ginseng C. A. Meyer) was isolated by the one-way path random sequencing of ginseng cDNA library clones and transgenic tobacco plants(Nicotiana tabacum NC82) were produced by the transformation of this ginseng CAB gene in use of Agrobacterium tumefaciens LBA4404. The CAB gene showed type 1 structure of LHCP-II, 84% similarity in nucleotide sequence and 92% in amino acid sequence to that of Nicotiana tabacum CAB40, respectively. Seed germination and initial growth of the transgenic tobacco plants transformed with the cDNA fragment were accelerated under low light intensity compared with those of normal tobacco plant, that may result from the higher light sensitivity of the transgenic plants than that of the normal.

• 전자공학회논문지A
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• 제31A권4호
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• pp.127-135
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• 1994

In this paper we propose an EWLD(Enhanced Weighted Levenshtein Distance) algorithm to organize code-string pattern matching linear array processor based on the mappting to an one-dimensional array from a two-dimensional matching matrix, and design a processing element(PE) of the processor, N PEs are required instead of NS02T in the processor because of the mapping. Data input and output between PEs and all internal operations of each PE are performed in bit-serial fashion. The bit-serial operation consists of the computing of word distance (WD) by comparison and the selection of optimal code transformation path, and takes 22 clocks as a cycle. The layout of a PE is designed based on the double metal $1.5\mu$m CMOS rule. About 1,800 transistors consistute a processing element and 2 PEs are integrated on a 3mm$\times$3mm sized chip.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.367-372
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• 2000

Accuracy of a machined component is determined by the relative motion between the cutting tool and the workpiece. One of the important factors which affects the accuracy of this relative motion is the geometric error of machine tools. In this study, geometric error is modeled using form shaping motion of machine tool, where a form shaping function is derived from the homogeneous transformation matrix. Geometric errors are measured by laser interferometer. After that, the local positioning error can be estimated from the form shaping model and geometric error data base. From this information, we can remodel the part by shifting the design surface to the amount of positional error. By generating tool path to the redesigned surface, we can reduce the machining error.

• 대한한의학원전학회지
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• 제23권1호
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• pp.47-58
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• 2010

"Sanghanron(傷寒論)" can be approached through the understanding of the formulas. It is very important to correlate the efficacy of drugs and pathogenesis of syndrome. In this sense, the author examines the Paeoniae Radix Alba's efficacy. The Paeoniae Radix Alba[芍藥] used in Gyejitang(桂枝湯), Galgeuntang(葛根湯), Sogeonjungtang (小建中湯), Jagyakgamchotang(芍藥甘草湯) all have a similar effect. The Paeoniae Radix Alba supplies the tendon and blood meridian with bodily fluids, so it treats the stiffness and pain of the head and neck[頭項强痛], stiffness of the neck and back[項背强几几] and acute pain in the abdomen[腹中急痛] etc. Meanwhile, the Paeoniae Radix Alba treats difficulty in urination. It moistens the path to the excretion of urine included among drugs which increase digestion and transformation.