• Title, Summary, Keyword: GI transition

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GI transition and disintegration test of enteric coated capsules using radiopaque material in rabbits (토끼에서 조영제를 이용한 장용성 capsule의 GI transition과 disintegration에 관한 검사)

  • Kim, Myung-cheol;Kim, Nam-joong
    • Korean Journal of Veterinary Research
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    • v.35 no.2
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    • pp.391-398
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    • 1995
  • This study was carried to investigate the usefulness of the radiopaque material as the GI transition and disintegration test of enteric coated capsules radiologically. The obtained results were as follows; 1. The GI transition times that the enteric coated capsules pass through the pylorus were that the time of the first capsule was 210 minutes and the time of the last capsules was more than 300 minutes. Therefore, the GI transition times largely differ from each animal and each enteric coated capsule. 2. The disintegration times of enteric coated capsules were similar in vitro test and in vivo test. 3. The GI transition and disintegration test of enteric coated capsules using barium sulfate, radiopaque material for the gastrointestinal track, was useful to investigate the times that the capsules passed through the pylorus and disintegrated in intestinal track.

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A Geometric Structure for Uniform Bend Transition in a pi cell

  • Kim, Tae-Jin;Lee, Seo-Hern;Park, Kyoung-Ho;Gwang, Jin-Seog;Lee, Gi-Dong;Yoon, Tae-Hoon;Kim, Jae-Chang
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.551-554
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    • 2003
  • A novel geometric solution for uniform bend transition in a pi cell has proposed. In order to obtain the uniform bend transition, we applied hybrid domain structure to the edge of a LC cell by using ion-beam alignment method. As a result, we confirmed that the uniform bend transition has arisen from the edge to the center. From the proposed structure, we expect that the reliable and uniform bend transition can be achieved in the pi cell.

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Oxygen Deficiency, Hydrogen Doping, and Stress Effects on Metal-Insulator Transition in Single-Crystalline Vanadium Dioxide Nanobeams

  • Hong, Ung-Gi;Jang, Seong-Jin;Park, Jong-Bae;Bae, Tae-Seong
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.424.1-424.1
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    • 2014
  • Vanadium dioxide (VO2) is a strongly correlated oxide exhibiting a first-order metal-insulator transition (MIT) that is accompanied by a structural phase transition from a low temperature monoclinic phase to a high-temperature rutile phase. VO2 has attracted significant attention because of a variety of possible applications based on its ultrafast MIT. Interestingly, the transition nature of VO2 is significantly affected by stress due to doping and/or interaction with a substrate and/or surface tension as well as defects. Accordingly, there have been considerable efforts to understand the influences of such factors on the phase transition and the fundamental mechanisms behind the MIT behavior. Here, we present the influences of oxygen deficiency, hydrogen doping, and substrate-induced stress on MIT phenomena in single-crystalline VO2 nanobeams. Specifically, the work function and the electrical resistance of the VO2 nanobeams change with the compositional variation due to the oxygen-deficiency-related defects. In addition, the VO2 nanobeams during exposure to hydrogen gas exhibit the reduction of transition temperature and the complex phase inhomogenieties arising from both substrate-induced stress and the formation of the hydrogen doping-induced metallic rutile phase.

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Control System of 600kW EBOP for Molten Carbonate Fuel Cell Generation System (600kW급 용융탄산염 연료전지 발전시스템용 EBOP 제어시스템)

  • Hwang, Tai-Sik;Joung, Woo-Taek;Yang, Byung-Hoon;Kim, Kwang-Seob;Kwon, Byung-Ki;Choi, Chang-Ho
    • Proceedings of the KIPE Conference
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    • pp.18-20
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    • 2008
  • An electrical balance of plant(EBOP) of a 600kW molten carbonate fuelcell (MCFC) has to transit from grid-connected(GC) mode to grid-independent(GI) mode when a grid is in a fault conditions. A minimum transition time is limited by four cycle for a 600kW MCFC to ride through a grid fault. In this paper, we propose a control algorithm of a 600kW EBOP for a MCFC system. The EBOP has three operation modes, i.e., GC mode, GI mode, and grid-synchronized(GS) mode. The EBOP controls output currents in a GC mode and regulates output voltages in GI or GS mode. GS mode is defined as an interface between GC mode and GI mode to make a mode transition smooth, i.e., limitation of inrush currents, regulation of output voltages within ANSI standard. Simulations and experiments carried out to verify the effectiveness of the proposed control algorithm.

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Synthesis of Multi-component Olivine by a Novel Mixed Transition Metal Oxalate Coprecipitation Method and Electrochemical Characterization

  • Park, Yeong-Uk;Kim, Jong-Sun;Gwon, Hyeok-Jo;Seo, Dong-Hwa;Kim, Seong-Uk;Hong, Ji-Hyeon;Gang, Gi-Seok
    • Proceedings of the Materials Research Society of Korea Conference
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    • pp.37.1-37.1
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    • 2010
  • The multi-component olivine cathode material, $LiMn_{1/3}Fe_{1/3}Co_{1/3}PO_4$, was prepared via a novel coprecipitation method of the mixed transition metal oxalate, $Mn_{1/3}Fe_{1/3}Co_{1/3}(C_2O_4){\cdot}2H_2O$. The stoichiometric ratio and distribution of transition metals in the oxalate, therefore, in the olivine product, was affected sensitively by the environments in the coprecipitation process, while they are the important factors in determining the electrochemical property of electrode materials with multiple transition metals. The effect of the pH, atmosphere, temperature, and aging time was investigated thoroughly with respect to the atomic ratio of transition metals, phase purity, and morphology of the mixed transition metal oxalate. The electrochemical activity of each transition metal in the olivine synthesized through this method clearly was enhanced as indicated in the cyclic voltammetry (CV) and galvanostatic charge/discharge measurement. Three distinctive contributions from Mn, Fe, and Co redox couples were detected reversibly in multiple charge and discharge processes. The first discharge capacity at the C/5 rate was $140.5\;mAh\;g^{-1}$ with good cycle retention. The rate capability test showed that the high capacity still is retained even at the 4C and 6C rates with 102 and $81\;mAh\;g^{-1}$, respectively.

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Consecutive Vowel Segmentation of Korean Speech Signal using Phonetic-Acoustic Transition Pattern (음소 음향학적 변화 패턴을 이용한 한국어 음성신호의 연속 모음 분할)

  • Park, Chang-Mok;Wang, Gi-Nam
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.801-804
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    • 2001
  • This article is concerned with automatic segmentation of two adjacent vowels for speech signals. All kinds of transition case of adjacent vowels can be characterized by spectrogram. Firstly the voiced-speech is extracted by the histogram analysis of vowel indicator which consists of wavelet low pass components. Secondly given phonetic transcription and transition pattern spectrogram, the voiced-speech portion which has consecutive vowels automatically segmented by the template matching. The cross-correlation function is adapted as a template matching method and the modified correlation coefficient is calculated for all frames. The largest value on the modified correlation coefficient series indicates the boundary of two consecutive vowel sounds. The experiment is performed for 154 vowel transition sets. The 154 spectrogram templates are gathered from 154 words(PRW Speech DB) and the 161 test words(PBW Speech DB) which are uttered by 5 speakers were tested. The experimental result shows the validity of the method.

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Effects of Tool Rotation and Transition Speed during Friction Stir Welding of Al 7075-T651 Alloy (Al 7075-T651의 마찰교반 용접에 대한 회전속도와 이송속도의 영향)

  • Han, Min-Su;Jeon, Jeong-Il;Jang, Seok-Gi
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.4
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    • pp.532-539
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    • 2007
  • The 7075-T651 Al alloy was welded by friction stir welding. Microstructure, macro behaviors and fracture type in the nugget, thermo-mechanically affected zone(TMAZ) and heat affected zone(HAZ) of the welded part were compared to base metal. The microsturctures of nugget zone were compared with tool rotation speeds and various tool transition speed. When the rotation speeds were decreased and transition speeds were increased, the hardness of nugget zone were decreased. Also, the optimal microstructure was observed at the low rotation speed of 800rpm and the high transition speed of 124mm/min. The transgranular dimple and quasi-cleavage at fractured part of nugget zone were investigated.

A Study of the Direction on Wordless Comics Inflection as The Transition (장면전환으로서 '글 없는 만화연출'의 활용 연구)

  • Lee, Won-Seok;Yoon, Gi-Hyuen
    • Cartoon and Animation Studies
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    • pp.13-26
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    • 2007
  • The wordless comics means comics without word and only the image. The study treats the research and the analysis on the wordless comics as the transition. The degree of study are the wordless comics is used as transition with material and scene, with subject and narrative and so on. These practical use of the wordless comics influence how much dramatic effect with comics rather than text comics.

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Impact Analysis of Transition in Electricity Generation System on a National Economy and Environmental Level in Korea: a Recursive CGE Modeling Approach (발전수단 전환이 우리나라 경제와 환경에 미치는 영향분석)

  • Lee, Min-Gi;Kim, Hong-Bae
    • Journal of the Korea Planners Association
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    • v.53 no.7
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    • pp.67-86
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    • 2018
  • This paper attempted to analyze impacts of transition in electricity generation system on a national economy and environmental level in Korea using a recursive computable general equilibrium(CGE) model. In particular, the paper presented a hybrid model combining the top-down CGE model with the bottom-up model which describes the structure of electricity production in detail. The impacts were analyzed by two policy scenarios base on the basic plan for electricity supply and demand proposed by the Korean government. As a result, the paper specifically showed that there exists a trade-off relationship in the policy-making between economic efficiency and environmental level. The paper also suggested that the transition in electricity generation system should be done more gradually and carefully.