• Title/Summary/Keyword: U-Product

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Mechanistic Investigation of Redox Process of 2-Amino-1-cyclopentene-1-dithiocarboxylate derivatives (2-Amino-1-cyclopentene-1-dithiocarboxylate 유도체들의 전극 반응메카니즘)

  • Kim, Yeong Sin;Kim, U Seong;Sim, Yun Bo;Choe, Seong Rak
    • Journal of the Korean Chemical Society
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    • v.34 no.3
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    • pp.260-266
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    • 1990
  • The electrochemical behavior of N-methyl-2-amino-l-cyclopentene-l-dithiocarboxylic acid $(N-CH_3 acdc) and 2-amino-l-cyclopentene-l-dithiomethyl ester (S-CH_3 acdc) in DMF have been investigated by the use of polarography, cyclic voltammetry and coulometry. The dimer of N-CH_3 acdc is further oxidized at +0.98 V via 2-electron process to produce free sulfur atom and cyclization product. The ring formation between two dithio group occurs along with the elimination of one sulfur atom. The elimination of sulfur atom occurs via two electron oxidation process at + 0.98 V vs. Ag/AgCl electrode. However, the cyclization does not occur in the S-CH_3$ acdc.

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BEHAVIORS OF MOLYBDENUM IN UO2 FUEL MATRIX

  • Ha, Yeong-Keong;Kim, Jong-Goo;Park, Yang-Soon;Park, Soon-Dal;Song, Kyu-Seok
    • Nuclear Engineering and Technology
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    • v.43 no.3
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    • pp.309-316
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    • 2011
  • Molybdenum is the most abundant fission product since its fission yield is equivalent to that of xenon, and it has a very special role in the chemistry of nuclear fuel because it influences the oxygen potential of $UO_2$ fuel. In this study, the distribution of molybdenum in spent $UO_2$ fuel specimens with 33.3, 41.0 and 57.6 GWd/tU burnup was measured by a LA-ICP-MS system and the reproducibility of the measured data was obtained. The Mo distribution was almost constant along the radius of a fuel except an increase at the periphery of the fuel. It showed a drop in reproducibility with relatively high deviation of measured values for the highest burnup fuel. To explain this, the state of molybdenum in a $UO_2$ matrix and its effect on the oxidation behavior of $UO_2$ were investigated. The low reproducibility was explained by the segregation of molybdenum, and the inhibition of oxidation by the molybdenum was also observed.

Promotion strategies for consumption of the fairly traded products (공정무역 상품의 소비를 활성화하기 위한 방안 연구)

  • Seo, Jeong-Hee
    • Korean Journal of Human Ecology
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    • v.20 no.6
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    • pp.1121-1133
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    • 2011
  • Fair trade has received increasing attention from ethical consumers in the North Trans-Atlantic world. It is a movement establishing alternative trading organizations to ensure minimal returns, safe working conditions, and to provide continuity in the trading relationship for disadvantaged producers, especially women and indigenous people in the South. Despite of the growing fair trade movement in the U.S. and Europe, it is still in the introductory stage in Korea. Although fair trade has gained some attention because of the efforts of activists, most Korean consumers are still unaware of it. This paper is divided into four sections including an introduction and conclusions. In section two, I analysed sales of the fairly traded products and the websites of the fairly traded products sellers. In section three, I proposed two effective recommendations for the better marketing and promotion strategies of fairly traded products. One proposal is for providing consumer information, like fair trade certificates, consumer campaigns, and consumer information of the fair trade sellers' websites analyses. The other is for establishing the infrastructure to promote the consumption of fairly traded products such as consumer education, corporate social responsibility, social enterprise, fair trade town and school, and networking. This study is relavant to academics, non-profit fair trade organizations, manufacturers, retailers and governments.

Bioproduction and Anticancer Activity of Biosurfactant Produced by the Dematiaceous Fungus Exophiala dermatitidis SK80

  • Chiewpattanakul, Paramaporn;Phonnok, Sirinet;Durand, Alain;Marie, Emmanuelle;Thanomsub, Benjamas Wongsatayanon
    • Journal of Microbiology and Biotechnology
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    • v.20 no.12
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    • pp.1664-1671
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    • 2010
  • A new biosurfactant producer was isolated from palm-oil-contaminated soil and later identified through morphology and DNA sequencing as the yeast-like fungus Exophiala dermatitidis. Biosurfactant production was catalyzed by vegetable oil, supplemented with a basal medium. The culture conditions that provided the biosurfactant with the highest surface activity were found to be 5% palm oil with 0.08% $NH_4NO_3$, at a pH of 5.3, with shaking at 200 rpm, and a temperature of $30^{\circ}C$ for a 14-day period of incubation. The biosurfactant was purified, in accordance with surfactant properties, by solvent fractionation using silica gel column chromatography. The chemical structure of the strongest surface-active compound was elucidated through the use of NMR and mass spectroscopy, and noted to be monoolein, which then went on to demonstrate antiproliferative activity against cervical cancer (HeLa) and leukemia (U937) cell lines in a dose-dependent manner. Interestingly, no cytotoxicity was observed with normal cells even when high concentrations were used. Cell and DNA morphological changes, in both cancer cell lines, were observed to be cell shrinkage, membrane blebbling, and DNA fragmentation.

An empirical study on RFID application to providing innovative service of steel product information (철강 제품정보 제공 서비스 체계 혁신을 위한 RFID 실증에 관한 연구)

  • Lee, Duk-Hee;Hwang, Kyung-A;Ahan, Sun-Il;Shim, Hyun-Seok;Kang, Jae-Goo;Kim, Eui-Jae;Kim, Jin-Soo;Kim, Myung-Sik
    • 한국IT서비스학회:학술대회논문집
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    • 2008.11a
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    • pp.237-241
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    • 2008
  • 철강산업은 생산 및 판매가 점차 글로벌화 되어가고 세계화 및 시장 개방의 가속화에 따라 국내외적으로 제품에 대한 가시성 및 추적성 확보의 중요성이 높아지고 있다. 이와 같은 경쟁 상황에서 살아남기 위해 지속적인 물류비용 최소화와 고객 제품정보 제공 서비스수준 혁신을 시도하고 있다. 각 공장단위 업무 및 장비의 자동화, 고속화, 지능화를 추구하는 등 실시간 기업환경의 u-Manufacturing을 실현의 필요성이 대두되고 있다. 본 논문에서는 철강 제품정보 제공 서비스 체계 혁신을 위해 무선인식기술(RFID) 요소 기술 개발과 개발된 기술을 실제 현장에 적용 실증 테스트를 수행하고 그 결과를 분석하여 최적의 적용 방안을 제시함에 있다.

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A Study on a Digital Amplifier.Controller for Proportional Control Valve (비례제어밸브용 디지털 앰프.컨트롤러에 대한 연구)

  • Lee, J.C.;Koh, J.U.;Kwon, T.H.;Shin, H.B.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.8 no.1
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    • pp.19-25
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    • 2011
  • This study presents the design of digital amplifier.controller for a proportional control valve and the development of PID discrete control scheme by using RCP(Rapid Controller Prototyping) system. RCP system is the device to embed the control code developed in PC into the microcontroller on-site. Ramp input test using the digital amplifier.controller developed in this study was carried out for the proportional control valve of domestic production and Bosch Rexroth respectively. The instability problem occurred around maximum displacement of localized valve spool at ramp input test was solved by supplementing offset current to the duty ratio of PWM(Pulse Width Modulation) driving signal to the solenoid. The comparison of test results between localized proportional control valve and Bosch Rexroth's product shows that the characteristics obtained by ramp input test and static flow gains are alike each other. Two valves are about the same in dead bands and hysteresis characteristics.

The content based standard data search technology under CALS integrated data environment (국방 CALS 통합 데이터 환경을 위한 내용 기반의 표준 데이터 검색 기술 개발)

  • Jeong, Seung-Uk;U, Hun-Sik
    • Journal of National Security and Military Science
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    • s.2
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    • pp.261-283
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    • 2004
  • To build up the military strength based on information oriented armed forces, the Korean ministry of national defense (MND) promotes the defense CALS (Continuous Acquisition and Life cycle Support) initiative for the reductions of acquisition times, improvements of system qualities, and reductions of costs. These defense CALS activities are the major component of the underlying mid and long term defense digitization program and the ultimate goal of program is to bring a quick victory by providing real-time battlefield intelligence and the economical operations of the military. The concept of defense CALS is to automate the acquisition and disposition of defense systems throughout their life cycle. For implementing defense CALS, the technology for exchange and sharing CALS standard data that is created once and used many times should be considered. In order to develop an efficient CALS information exchange and sharing system, it is required to integrate distributed and heterogeneous data sources and provide systematic search tools for those data. In this study, we developed a content based search engine technology which is essential for the construction of integrated data environments. The developed technology provides the environment of sharing the CALS standard data such as SGML(Standard Generalized Markup Language) and STEP(Standard for The Exchange of Product model data). Utilizing this technology, users can find and access distributed and heterogeneous data sources without knowing its actual location.

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A Study on the Tool Wear and Surface Roughness in Cutting Processes for a Neural-Network-Based Remote Monitoring system (신경회로망을 이용한 원격모니터링을 위한 가공공정의 공구마모와 표면조도에 관한 연구)

  • Kwon, Jung-Hee;Jang, U-Il;Jeong, Seong-Hyun;Kim, Do-Un;Hong, Dae-Sun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.1
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    • pp.33-39
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    • 2012
  • The tool wear and failure in automatic production system directly influences the quality and productivity of a product, thus it is essential to monitor the tool state in real time. For such purpose, an ART2-based remote monitoring system has been developed to predict the appropriate tool change time in accordance with the tool wear, and this study aims to experimently find the relationship between the tool wear and the monitoring signals in cutting processes. Also, the roughness of workpiece according to the wool wear is examined. Here, the tool wear is indirectly monitored by signals from a vibration senor attached to a machining center. and the wear dimension is measured by a microscope at the start, midways and the end of a cutting process. A series of experiments are carried out with various feedrates and spindle speeds, and the results show that the sensor signal properly represents the degree of wear of a tool being used, and the roughnesses measured has direct relation with the tool wear dimension. Thus, it is concluded that the monitoring signals from the vibration sensor can be used as a useful measure for the tool wear monitoring.

Burned Area Detection After Wildfire Using Landsat 7 ETM+ SLC-off Images

  • Quoc, Khanh Le;Sy, Tan Nguyen;Nhat, Thanh Nguyen Thi;Thanh, Ha Le
    • IEIE Transactions on Smart Processing and Computing
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    • v.2 no.3
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    • pp.117-129
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    • 2013
  • The increasing demand for monitoring wildfires and their impact on the land surface have prompted studies of burned area extraction and analysis. To differentiate burned and unburned area, the earlier method of the Moderate Resolution Imaging Spectro-radiometer (MODIS) Burned Area Detection Algorithm was proposed to estimate the change in land surface based on the reflectance energy. The energy, whose wavelengths are sensitive to burning, was selected to calculate the change parameter $Z_{score}$. This method was applied using the MODIS images to produce a MODIS Burned Area product. The approach was to simplify this algorithm to make it compatible with the Landsat 7 ETM+ SLC-off images. To extract the refined version of burned regions, post-processing was carried out by applying a median filter, dilation morphology algorithm, and finally a gap filling method. The experimental results showed that the detailed burned areas extracted from the proposed method exhibited more spatial details than those of the MODIS Burned products in the large U.S areas. The results also revealed the discontinuous distribution of burned regions in Vietnam forests.

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X-Ray Crystal Structure Determination of Diazatricyclodione (디아자트리사이클로디온의 X선 결정구조 결정)

  • Kim, Sang-Su;An, Jong-Il;Han, Bo-Seop
    • Korean Journal of Crystallography
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    • v.1 no.2
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    • pp.84-90
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    • 1990
  • 1,3-Diazatricyclo (5.2.1.Os .to) decane-2,11-dione , C8H10N2O2. MW=166.15, Monoclinic, P2/n a= 6.585(7) , b=9.089(4), c=12.937(10)A, β=95.72(5)˚, V=770.4A3, Z=4, Dc=1.43(4) g/cm3, λ (Mo Ka)=0.7093A, r=1.Ocm-1, T=295˚K, final R=0.037 for 698 unique observed reflections. The compound is the product of the intramolecular (2+2) photocycloaddition of Nl-(w-butenyl)uracil and belongs to a (5.2.1.O5.10) tricyclic system. A pair of molecules related by the inversion symmetry are held together by the strong hydrogen bonding interactions between 02 and H3 of the uracil moiety.

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