• Title, Summary, Keyword: Synthesis

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Design Space Exploration of Many-Core Architecture for Sound Synthesis of Guitar on Portable Device (휴대 장치용 기타 음 합성을 위한 매니코어 아키텍처의 디자인 공간 탐색)

  • Kang, Myeongsu;Kim, Jong-Myon
    • Proceedings of the Korean Society of Computer Information Conference
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    • pp.1-4
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    • 2014
  • Although physical modeling synthesis is becoming more and more efficient in rich and natural high-quality sound synthesis, its high computational complexity limits its use in portable devices. This constraint motivated research of single-instruction multiple-data many-core architectures that support the tremendous amount of computations by exploiting massive parallelism inherent in physical modeling synthesis. Since no general consensus has been reached which grain sizes of many-core processors and memories provide the most efficient operation for sound synthesis, design space exploration is conducted for seven processing element (PE) configurations. To find an optimal PE configuration, each PE configuration is evaluated in terms of execution time, area and energy efficiencies. Experimental results show that all PE configurations are satisfied with the system requirements to be implemented in portable devices.

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Mechanism synthesis of Planar Four-bar Linkage for rigid body guidance by bushing elements (부싱 요소를 이용한 평면 4 절 기구의 강체 유도 기구 합성)

  • Yoo, Hong Hee;Hong, Jung Ryeol
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.464-466
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    • 2014
  • The mechanism synthesis methods, graphical, analytical and computer-aided technique have been proposed for selecting and scaling mechanical system. According to developing computation tools, mechanism could be synthesized much faster and more correct than previous analytical ways by improved techniques. In this paper, the improved synthesis method is proposed to solve body guidance synthesis problem. To perform the mechanism synthesis for body guidance, a planar linkage is modeled as a set of free three bushings located in design space. The values of bushing stiffness and x, y position of bushings yielding a desired functional requirement related to input motion are found by using an optimization technique.

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A New Paradigm Shift for the Green Synthesis of Antibacterial Silver Nanoparticles Utilizing Plant Extracts

  • Park, Youmie
    • Toxicological Research
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    • v.30 no.3
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    • pp.169-178
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    • 2014
  • This review covers general information regarding the green synthesis of antibacterial silver nanoparticles. Owing to their antibacterial properties, silver nanoparticles are widely used in many areas, especially biomedical applications. In green synthesis practices, the chemical reducing agents are eliminated, and biological entities are utilized to convert silver ions to silver nanoparticles. Among the various biological entities, natural plant extracts have emerged as green reducing agents, providing eco-friendly routes for the preparation of silver nanomaterials. The most obvious merits of green synthesis are the increased biocompatibility of the resulting silver nanoparticles and the ease with which the reaction can be carried out. This review summarizes some of the plant extracts that are used to produce antibacterial silver nanoparticles. Additionally, background information regarding the green synthesis and antibacterial activity of silver nanoparticles is provided. Finally, the toxicological aspects of silver nanoparticles are briefly mentioned.

Carbon Nanotube Synthesis with High Purity by Introducing of NH3 Etching Gas (암모니아 식각 가스 도입에 의한 고순도 탄소나노튜브의 합성)

  • Lee, Sunwoo;Lee, Boong-Joo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.6
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    • pp.782-785
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    • 2013
  • Multi-walled carbon nanotubes were synthesized on Ni catalyst using thermal chemical vapor deposition. By introducing ammonia gas during the CNT synthesis process, clean and vertically aligned CNTs without impurities could be prepared. As the ammonia gas increased a partial pressure of hydrogen in the mixed gas during the CNT synthesis process, we could control the CNT synthesis rate appropriately. As the ammonia gas has an etching ability, amorphous carbon species covering the catalyst particles were effectively removed. Therefore catalyst particles could maintain their catalytic state actively during the synthesis process. Finally, we could obtain clean and vertically aligned CNTs by introducing $NH_3$ gas during the CNT synthesis process.

Short-Cut Pathway to Synthesize Cellulose of Encysting Acanthamoeba

  • Moon, Eun-Kyung;Kong, Hyun-Hee
    • The Korean Journal of Parasitology
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    • v.50 no.4
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    • pp.361-364
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    • 2012
  • The mature cyst of Acanthamoeba is highly resistant to various antibiotics and therapeutic agents. Cyst wall of Acanthamoeba are composed of cellulose, acid-resistant proteins, lipids, and unidentified materials. Because cellulose is one of the primary components of the inner cyst wall, cellulose synthesis is essential to the process of cyst formation in Acanthamoeba. In this study, we hypothesized the key and short-step process in synthesis of cellulose from glycogen in encysting Acanthamoeba castellanii, and confirmed it by comparing the expression pattern of enzymes involving glycogenolysis and cellulose synthesis. The genes of 3 enzymes, glycogen phosphorylase, UDP-glucose pyrophosphorylase, and cellulose synthase, which are involved in the cellulose synthesis, were expressed high at the 1st and 2nd day of encystation. However, the phosphoglucomutase that facilitates the interconversion of glucose 1-phosphate and glucose 6-phosphate expressed low during encystation. This report identified the short-cut pathway of cellulose synthesis required for construction of the cyst wall during the encystation process in Acanthamoeba. This study provides important information to understand cyst wall formation in encysting Acanthamoeba.

Gamma-ray Induced DNA Repair Synthesis in Relation to Chromosome Exchanges in Mammalian Cells in Vitro (哺乳動物細胞에 있어 감마線에 의한 DNA 回復合成과 染色體交換과의 聯關性)

  • Park, Sang-Dai
    • The Korean Journal of Zoology
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    • v.18 no.1
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    • pp.41-49
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    • 1975
  • Dose response and time dependence of DNA repair synthesis were investigated to determine the possible relationship between DNA repair synthesis and chromosome exchanges in $\\gamma$-ray irradiated BHK-21 and KB cell lines. DNA repair synthesis induced by $\\gamma$-ray was dose dependent up to 5kR, then leveling off occurred until 50 kR was reached. Time dependence of DNA repair synthesis was continued for up to 1$\\sim$2 hours after irradiation although the initial dose responses were cell line specific. Chromosome exchanges induced by $\\gamma$-ray showed different radiosensitivities in these cell lines and did not show a correlation with the DNA repair synthesis.

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Qualitative comparison of chemical and green synthesized Fe3O4 nanoparticles

  • Gokila, V.;Perarasu, V.T.;Rufina, R. Delma Jones
    • Advances in nano research
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    • v.10 no.1
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    • pp.71-76
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    • 2021
  • Synthesis of nanoparticles using green technology using plants is gaining significant attention as it is an environmentally friendly substitute to conventional physical and chemical methods. The present study was focused on the chemical and green synthesis of Iron Oxide nanoparticles from ferric chloride. The green synthesis was achieved by utilizing the bio components of Hibiscus rosa-sinensis. The Fe3O4 nanoparticles with the size range of 87-400 nm were synthesized by wet chemical reduction technique which are unstable, prone to aggregation while in green synthesis the phytochemicals present in the leaf extract acts as the capping as well as the reducing agent thus the green synthesized iron (III) oxide nanoparticles were naturally stabilized, spherical shaped and are in the size range of 2-80 nm. The results of both the protocols are compared and presented briefly.

Operation Characteristics of Gasification/Melting Pilot Plants for Synthesis Gas Production using Coal and Waste (석탄 및 폐기물로부터 합성가스 제조를 위한 가스화용융 Pilot Plant 운전특성)

  • Chung, Seok-Woo;Yun, Yong-Seung;Yoo, Young-Don
    • 한국신재생에너지학회:학술대회논문집
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    • pp.561-564
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    • 2005
  • Gasification has been regarded as a very important technology to decrease environmental pollution and to obtain higher efficiency. The gasification process converts carbon containing feedstock into a synthesis gas, composed primarily of CO and $H_2$. And the synthesis gas can be used as a source for power generation or chemical material production. Through more than nine years, IAE developed and upgraded several gasification/melting pilot plant system, and obtained a good quality synthesis gas. This paper illustrates the gasification characteristics and operation results of two 3 ton/day synthesis gas production facilities. One is entrained-bed slagging type coal gasifier system which is normally operated in the temperature range of $1,400\~1,450^{\circ}C,\;8\~10$ bar pressure. And the other is fixed-bed type gasification/melting furnace system using MSW and industrial wastes as a feedstock.

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Kinetics on Direct Synthesis Dimethyl Ether (디메틸에테르의 직접반응 속도론)

  • Cho Wonihl;Choi Chang Woo;Baek YoungSoon;Row Kyung Ho
    • 한국가스학회:학술대회논문집
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    • pp.83-87
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    • 2005
  • The kinetics of the direct synthesis of DME was studied under different conditions over a temperature range of $220\~280^{\circ}C$, syngas ratio $1.2\~ 3.0$ All experiment were carried out over hybrid catalyst, composed to a methanol synthesis catalyst (Cu/ZnO/$Al_2O_3$) and a dehydration Catalyst ($\gamma$-Al_2O_3$) The observed reaction rate qualitatively follows a Langmiur-Hinshellwood type of reaction mechanism. Such a mechanism is considered with three reaction, methanol synthesis, methanol dehydration and water gas shift reaction. From a surface reaction with dissociative adsorption of hydrogen, methanol and water, individual reaction rate was determined

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UV Actions in Plant Photomorphogenesis -Induction and Amplification of Anthocyanin Synthesis in Broom Sorghum-

  • Shichijo, Chizuko;Yatsuhashi, Hiroko;Hashimoto, Tohru
    • Journal of Photoscience
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    • v.9 no.2
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    • pp.338-340
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    • 2002
  • In broom sorghum, Sorghum bicolor Moench, UV causes anthocyanin synthesis having action peaks in UVA and UVB regions. We previously reported that UV induces anthocyanin synthesis through UVB photoreceptor and phytochrome activated by UV. Furthermore, UVA and UVB amplify phytochrome-induced anthocyanin synthesis (PIAS). Our action- spectroscopic research indicated that a UV -receptor for amplification of PIAS is likely to be the same or same type of UVB photoreceptor for induction of anthocyanin synthesis. UVA-amplification of PIAS can be explained by the action of a cryptic red light signal (CRS), an amplification factor for PIAS produced by a distinct phytochrome-species activated by UVA. We suggest that UVA photoreceptors are not involved in anthocyanin synthesis in the broom sorghum.

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