• Journal of the Korean Institute of Telematics and Electronics C
• /
• v.34C no.10
• /
• pp.27-35
• /
• 1997

In this paper, we propose a new scheme for the generation of partial products for VLSI fast parallel multiplier. It adopts a new encoding method which halves the number of partial products using 2x2 submultipliers and rearrangement of primitive partial products. The true 4-input CSA can be achieved with appropriate rearrangement of primitive partial products out of 2x2 submultipliers using the newly proposed theorem on binary number system. A 16bit x 16bit multiplier has been desinged using the proposed method and simulated to prove that the method has comparable speed and area compared to booth's encoding method. Much smaller and faster multiplier could be obtained with far optimization. The proposed scheme can be easily extended to multipliers with inputs of higher resolutions.

• Journal of the Korean Chemical Society
• /
• v.6 no.2
• /
• pp.162-170
• /
• 1962

The rearrangement reaction of azoxybenzenes into hydroxyazobenzenes in strongly acidic solution has been studied by an U. V. spectrophotometric method and by isolation of the rearranged compound. In all cases under investigation, it appeared that the oxygen atom in the azoxy group migrated to the unsubstituted ring, depending neither on the substituent already present in the other ring, nor on the distance between the oxygen atom and the eligible position; whereas, the position in the open ring, ortho or para, to which the oxygen migrates depends on the substituent already present in the other ring. In all compounds besides ${\alpha}$-and ${\beta}$-4-methyl azoxybenzene, the oxygen atom migrates to the para position. In the case of ${\alpha}$ and ${\beta}$-4-methylazoxybenzene, the oxygen atom migrates to the ortho position of the unsubstituted ring.

• Journal of the Korean Chemical Society
• /
• v.58 no.6
• /
• pp.569-574
• /
• 2014

The synthesis of O-desmethylangolensin (O-DMA) analogues from methoxy-substituted benzoic acids was described. Treatment of methoxy-substituted benzoic acids with 2 equiv of ethyllithium afforded methoxypropiophenones, which were subsequently transformed to ethyl 2-(methoxyphenyl)propionates via 1,2-rearrangement of the methoxyphenyl group using $Pb(OAc)_4/HClO_4$ in triethyl orthoformate. After hydrolysis with KOH, the 2-(methoxyphenyl)propionic acids were reacted with di-2-pyridyl carbonate to afford 2-pyridyl 2-(methoxyphenyl)propionates, which were acylated with methoxy-substituted phenylmagnesium bromides to give methoxy-${\alpha}$-methyldesoxybenzoins. The methoxy groups of these compounds were selectively or fully demethylated using boron tribromide to give diverse O-DMA analogues in high yields.

• Microbiology and Biotechnology Letters
• /
• v.18 no.4
• /
• pp.433-436
• /
• 1990

The TOL plasmid, pWWO, conjugally transferred from Pseudomonas putida mt-2 was dissociated into TOL* and TOL $\Delta$A in P. putidu PpGl carrying CAM plasmid. The TOL* was integrated into the CAM plasmid, and the resulting plasmid was designated as CAM::TOL*. The introduction of NAH plasmid, belonging to Inc P9 incompatibility group, into P. putida CSTBA carrying CAM::TOLt plasmid and TOL A plasmid did not affect m-toluate catabolism, but resulted in expelling the TOL $\Delta$ plasmid.

• Proceedings of the Korean Society of Agricultural Engineers Conference
• /
• 2005.10a
• /
• pp.515-520
• /
• 2005

The objective of the study is to assess the water quality improvement resulted from the rearrangement of the irrigation water supply systems at Mankyeong River and Ansung Chun basin. There is a mixed type of watershed composed of urban and rural areas in the region. From the water quality analysis, showed high T-N, T-P concentration in Ansung chun and Mankyeong river caused by paddies separated widely around Ansung chun and Mankyeong river and by runoff of the pollution from the Ansung and Jeonju city. but the upstream of the river showed clean water quality, so if we use the upstream water as river maintenance water for water quality improvement, it is expected to be positive effect for rural environmental aspect.

• Proceedings of the KIEE Conference
• /
• 2002.07d
• /
• pp.2454-2456
• /
• 2002

Since articuratory synthesis models the human vocal organs as precise as possible, it is potentially the most desirable method to produce various words and languages. This paper proposes a new type of an articulatory synthesizer using Mermelstein vocal tract model and Kelly-Lochbaum digital filter. Previous researches have assumed that the length of the vocal tract or the number of its cross sections dose not vary while uttering. However, the continuous utterance can not be easily implemented under this assumption. The limitation is overcomed by "Buffer Rearrangement" for dynamic vocal tract in this paper.

• Journal of the Korean Ceramic Society
• /
• v.36 no.11
• /
• pp.1243-1251
• /
• 1999

Densification behavior and microstructural evolution during the liquid-phase sintering of alumina-anorhite system were investigated as a function of MgO addition. When MgO component was added in either alumina or anorthite glass powder the aspect ratio of alumina grains decreased and concurrently the are of flat interface which was formed as a result of contact solid alumina gains rather increased. Consequently addition of MgO component in the Al2O3-amorthite system brought about suppression of the rearrangement of solid grains during the liquid phase sintering and then densification of specimens was also retarded.

• Macromolecular Research
• /
• v.17 no.9
• /
• pp.697-702
• /
• 2009

Mesoporous ethanesilica thin film was prepared using PEO-PLGA-PEO triblock copolymers as structure-directing agents and (1,2-bis(triethoxysilyl) ethane BTESE; bridged organosilicates) as inorganic precursors via one-step sol-gel condensation of ethanesilica precursors. The mesostructure of ethanesilica films is critically dependent on the processing experimental parameters after the hydrolyzed silica sol mixture was spin-cast. This study examined the effects of the block copolymer template/organosilica precursor ratio in the casting solution and aging period before calcination of the mesostructure. It was further demonstrated that mesoscopic ordering of organosilicate thin films is induced by the rearrangement of block copolymer template/organosilica hybrid during thermal decomposition of the PEO-PLGA-PEO triblock copolymer. The mesoporous structure and morphology were characterized by SAXS, TEM and solid-state NMR measurement.

• Proceedings of the KSR Conference
• /
• 2009.05a
• /
• pp.1279-1307
• /
• 2009

The development of station districts is mainly categorized into 4 types. The first one is the composite development of the railroad station-areas. The second is the re-development of the direct station districts. The third is the rearrangement of the indirect station districts. And the fourth is the development of the new station districts for newly constructed railroad routes. Among these, this study aims to focus on the problems and methods of improvement in the development of the railroad station-areas, since there is not much problem with the implementation of the city development project, housing site development project or city rearrangement project for the direct or indirect station districts.

• YAKHAK HOEJI
• /
• v.53 no.6
• /
• pp.377-381
• /
• 2009

Isowogonin, 5,8-dihydroxy-7-methoxyflavone, is a flavonoid isolated from the root of Scutellaria baicalensis Georgi, a medicinal plant traditionally used since the ancient time. It was thought to possess a variety of biological activities, such as antioxidation, anti-inflammation and hepatoprotective effect. But a quantity of isowogonin obtained from Scutellaria baicalensis Georgi is not that enough for in vivo test. There have been no appropriate approaches available for a facile synthesis of isowogonin. So we describe a concise and efficient scheme for synthesis of isowogonin from a commercial available 2,4,6-trimethoxyphenol, which includes the Fries rearrangement and selective demethylation as key steps.