• Journal of applied mathematics & informatics
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• v.4 no.1
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• pp.1-16
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• 1997

In this paper we study efficient parallel implementation for hybrid iterative methods BICGSTAB and BICGSTAB $(\ell)$ with ${Well}=2$ on the CRAY C90 and the efficiency of their parallel performance is evaluated. numerical experiments suggest that on the CRAY C90 a parallel inner product algorithm called PDOTB be used for the par-allelization of hybrid iterative methods containing sensitive values of inner products. Lastly it is shown that the number of iterations in which parallel hybrid iterative methods satisfy a certain convergence criterion depends on the number of processors to be used.

• Korea-Australia Rheology Journal
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• v.16 no.4
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• pp.219-226
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• 2004

In this study the deformation of liquid-air interface of Newtonian or Boger fluids filled between two par­allel-plates geometry was investigated when two surfaces were separated at a constant speed. The interface between the fluid and air showed either stable or unstable deformation depending on experimental con­ditions. Repeated experiments for a wide range of experimental conditions revealed that the deformation mode could be classified into three types: 'stable region', 'fingering' and 'cavitation'. The experimental condition for the mode of deformation was plotted in a capillary number vs. Deborah number phase plane. It has been found that the elasticity of Boger fluids destabilize the interface deformation. On the other hand, the elasticity suppresses the formation and growth of cavities.

• Korea-Australia Rheology Journal
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• v.16 no.4
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• pp.213-218
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• 2004

Linear high-density polyethylene (PE) was controlled to induce strain-hardening behavior by introducing a small amount of second component with an anisotropic structure. In order to form an anisotropic structure in the PE matrix, the polymer was extruded through a twin-screw extruder, and the structure was controlled by varying the extrusion conditions. Depending on conditions, the second component formed a film, thread and droplet structure. If the second component was kept rigid, the morphology evolution could be delayed and the second component could maintain its film or thread structure without further relaxation. In par­ticular, the second component of the thread structure made a physical network and gave rise to remarkable strain hardening behavior under high extension. This study suggests a new method that induces strain hard­ening behavior by introducing a physically networked second component into the linear polymer melt. This result is anticipated to improve the processibility of linear polymers especially when extensional flow is dominant, and to contribute to our understanding of strain hardening behavior.

• Proceedings of the Korean Society of Veterinary Pathology Conference
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• 2000.09a
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• pp.22-22
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• 2000

A case of renal candidiasis is reported in a 4-year-old male Masked Palm civet (Paguma larvata). On necropsy, the kidneys were bilaterally swollen, pale and had numerous 1 to 3 mm diameter white foci throughout the parenchyma on cut section. The urinary bladder was filled with opaque and milky exudate. Histologically, severe infiltration of neutrophils and macrophages and necrosis were noted in the interstitial areas of both cortex and medulla and in the lumens of renal tubules and collecting duct often resulting in cystic dilation of the tubules. (omitted)

• Korean Journal of Microbiology
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• v.3 no.2
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• pp.22-26
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• 1965

In order to investigate the host range of the mosaic disease of black locust in the Chunchon area, the sap of the mosaic-diseased leaves of black locust itself and the cowpea leaves infected with the above mentioned sap, were inoculated to 53 species of plants belong to 12 families. As to the result, no difference in infection was found as related to the virus sources, and the infection was recognized in 4 species of the family Chenopodiaceae and 8 species of the family Leguminosae. The plants recognized as hosts are as follows: the plants which showed local infection are Chenopodium album, Ch. ambrosioides, Ch. quinoa; the plants which showed systemic infection are Chenopodium amaranticolor, Phaseolus vulgaris, Robinia pseudo-acacia, Vigna sinensis; and Astragalus sinicus, Melilotus indicus, Phaseolus angularis, Pisum sativum and Vicia faba were recognized as carriers. Through investigating its host ranges and symptoms, this mosaic virus of black locust seems not to be regarded as the group of the black locust mosaic virus in southeastern Europe reported by Milinko et al (1961). And, too, it is thought hardly to exist in combination with the cowpea mosaic virus. It appears, therefore, that this mosaic virus was confined to that of black locust.

• Journal of Microbiology and Biotechnology
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• v.25 no.4
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• pp.554-558
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• 2015

Drug delivery systems (DDSs) incorporating bacterial minicells have been evaluated as a very powerful tool in view of biocompatibility. However, limited studies have been carried out on these systems, mainly using minicells from Salmonella sp. and Escherichia coli. Thus, we generated a new minicell-producing strain from an endotoxin-free Corynebacterium glutamicum by the inactivation of genes related to cell division. The two knockout strains, ${\Delta}parA$ and ${\Delta}ncgl1366$, showed distinct abilities to produce minicells. The resulting minicells were purified via sequential antibiotic treatments and centrifugations, which resulted in reproducible yields.

• Animal cells and systems
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• v.6 no.4
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• pp.323-326
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• 2002

One hundred and three random complementary DNA clones representing rainbow trout intestine were par1i811y sequenced as an approach to analyze the transcribed sequences of its genome. Of the sequences generated, 60.0% of the ESTs were represented by 40 known genes. Thirty-five clones of unknown gene products potentially represented 34 novel genes. The most Bbundantly represented messages were the 28S ribosomal protein (6.5%) and beta actin (5.8%). The genes involved in ribosome formation (18%) accounted for the major gene expression. Development of EST panels representing the genes expressed in a particular tissue will be useful in determining the role of these genes in normal function and in response to developmental, hormonal, environmental and physiological changes.

• Journal of the Korean Ceramic Society
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• v.20 no.1
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• pp.49-54
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• 1983

The main object of this study is to investigate the effect of Al powder as an additive on the sintering of calcined alumina comparing with that of calcined alumina alone. The degree of Al oxidation is calculated by measuring the weight increase during the firing Water absorption bulk density and compressive strength of the $Al_2O_3+Al$ system at each temperature are compared with those of $Al_2O_4$ alone. The $Al_2O_3+Al$ system shows better physical propeties than Al2O3 alone and it seems by the SEM observation that the fine oxidized Al particles(fine $Al_2O_3$ particles submicron unit) fill the interstices of the original $Al_2O_3$ par-ticles and thus result in the well-close-packed arrangement of the particles.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1998.05a
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• pp.400-404
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• 1998

본 논문에서는 도심지 이동 통신에서 SINR 성능을 향상시키기 위해 기존의 배열 안테나에 최소 평균 자승(LMS) 알고리즘을 적용하여 실제 배열 출력과 이상적 출력간의 최소 평균 오차(MSE)를 최소화하고 안테나의 배열로부터 가중치를 결합한 신호에 의해 방향성을 적절히 제어하여 간섭신호를 효과적으로 제거한다. 배열 출력 신호 대 간섭에 추가된 잡음비(SINR) 성능 분석에 적합한 삼차원적 분석을 사용하여 적응 배열 원소를 사용한 성능과 모노폴 안테나 원소에서 배열의 성능을 비교한다. 또한, SINR 패턴 각 비(PAR)를 사용하여 적응 배열 원소 방위, 내부 원소간의 간격들 그리고 입사 신호 방향들과 같은 다른 배열 매개 변수들에서 배열 성능을 계산하고 SINR 패턴의 양적 평가를 한다. 결과로서, 적응 배열 원소가 가정된 신호 환경에 있어 4상파형(quarterwave) 모노폴(monopole) 안테나 배열보다 더 바람직하다.

• Journal of Information Processing Systems
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• v.15 no.4
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• pp.748-764
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• 2019

In order to deal with the filtering delay problem of least mean square adaptive filter noise reduction algorithm and music noise problem of spectral subtraction algorithm during the speech signal processing, we combine these two algorithms and propose one novel noise reduction method, showing a strong performance on par or even better than state of the art methods. We first use the least mean square algorithm to reduce the average intensity of noise, and then add spectral subtraction algorithm to reduce remaining noise again. Experiments prove that using the spectral subtraction again after the least mean square adaptive filter algorithm overcomes shortcomings which come from the former two algorithms. Also the novel method increases the signal-to-noise ratio of original speech data and improves the final noise reduction performance.