• Title, Summary, Keyword: APM

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Development of Adsorptive Permeation Membrane (APM) and Process for Separation of $CO_2$ from gas mixtures (이산화탄소 분리를 위한 흡착투과막 및 공정 개발)

  • Yeom, Choong Kyun;Ahn, Hyo Sung;Kang, Kyeong Rok;Kim, Joo Yul;Han, Jin-Soo;Kwon, Keun-Oh
    • Membrane Journal
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    • v.23 no.6
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    • pp.409-417
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    • 2013
  • Adsorptive permeation hollow fiber membrane (APM) has been developed for effectively separating $CO_2$ from gas mixture. Inside the APM, zeolite 13X particles were uniformly dispersed without covering their surfaces by a symmetric porous structure of polypropylene lattice. In this study, $CO_2/N_2$ mixture was used as a simulated gas mixture. Separation was achieved by adsorbing $CO_2$ on the zeolite particles in the APM and then permeating $N_2$ into permeate side in passing all the feed gas through the APM. Adsorptive permeation tests were carried out with a set of APM modules, and the adsorptive permeation performances of the modules were analyzed from the test results. After saturation of the adsorbent with $CO_2$, the APM was regenerated by desorption of $CO_2$ from it through vacuuming both inside of outside of the APM hollow fiber, and the regeneration process of the APM by vacuuming was discussed in terms of regeneration efficiency and energy consumption.

한국증권시장(韓國證券市場)에서 다변량검증(多變量檢證)에 근거한 CAPM과 APM의 실증적(實證的) 검증(檢證)

  • Gu, Bon-Yeol
    • The Korean Journal of Financial Studies
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    • v.5 no.1
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    • pp.135-164
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    • 1999
  • 본(本) 연구(硏究)는 Jobson(1982)의 주식(株式)의 수익율(收益率)이 정규분포(正規分布)를 할 경우에 다변량(多變量)의 통계학(統計學)을 이용하여 CAPM과 APM을 검증(檢證)하는 방법(方法)을 유도하였다. 이에따라 회귀분석(回歸分析)에 의한 검증방법(檢證方法)과 다변량(多變量)의 검증방법(檢證方法)을 제시하고 현실적으로 CAPM과 APM이 한국증권시장(韓國證券市場)에서 적용가능(適用可能)한가에 대한 실증적(實證的) 검증(檢證)을 실시하였다. 실증적(實證的) 검증(檢證)을 위하여 먼저 우리나라의 주식수익율자료(株式收益率資料)를 1980년 1월부터 1997년 6월까지의 월별자료(月別資料)에 의하여 11개 산업별(産業別) 분류작업을 통하여 산업별(産業別)포트폴리오를 구성하였다. 특히 APM의 경우에는 요인(要因)의 증가에 따라 APM이 한국증권시장에서 적용가능한가를 검증(檢證)하기 위하여 요인(要因)을 2개, 6개 그리고 10개까지 증가시켜 모형(模型)의 적합성(適合性)을 검증(檢證)하였다. 검증결과(檢證結果), CAPM과 APM모두 한국증권시장(韓國證券市場)에서 적용가능(適用可能)한 것으로 나타났다. 특히 APM의 경우에는 요인(要因)이 2개, 6개와 10개로 증가시 어떤 경우에도 적용가능한 것으로 나타났다. 이는 기대수익율(期待收益率)의 설명력을 높이기 위하여 몇 개의 가격화(價格化) 요인(要因)이 APM에 영향을 미치는 가를 연구하는 전통적인 검증방법(檢證方法)은 큰 의미가 없는 것으로 나타났다.

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Evaluation of Polyvoltine Hybrids Based on Silk Productivity in Silkworm, Bombyx mori L.

  • Rao, C.G.P.;Chandrashekaraiah;Ramesh, C.;Basha, K.Ibrahim;Seshagiri, S.V.;Nagaraju, H.
    • International Journal of Industrial Entomology
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    • v.8 no.2
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    • pp.181-187
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    • 2004
  • Polyvoltine silkworm breeds/hybrids play an important role in tropical sericulture. In the process of synthesizing more potential polyvoltine hybrids(polyvoltine${\times}$bivoltine) of superior quantity and quality, the Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI) has developed 8 promising polyvoltine breeding lines (SDMG2, APM16, APM15, APM14, APM5, RM2, APM3, APM13). In order to study their hybrid vigour and performance, these breeds were crossed with 4 potential bivoltine testers (SDD1, SDD2, SDD3, APS8), and 32 different hybrid combinations were prepared and evaluated for their mid parent heterosis (MPH) and better parent heterosis (BPH) of silk productivity. Since silk is the ultimate product required for commercial purpose, based on silk productivity and its heterosis, three superior polyvoltine hybrid combinations namely RM2${\times}$APS8 (24.3%), APM3${\times}$APS8 (12.4%) and APM15${\times}$SDD2 (10.8%) were adjudicated as potential heterotic hybrid combinations of superior silk yield and hence recommended for further large scale field trails and commercial exploitation.

Pulse Compression of an Additive-Pulse Mode-Locked CW Nd:YLF Laser by Using an Optical Fiber and a Grating Pair (광섬유와 회절격자쌍을 이용한 Additive-Pulse Mode-Locking된 CW Nd:YLF 레이저의 광펄스 압축)

  • 안승준
    • Korean Journal of Optics and Photonics
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    • v.4 no.1
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    • pp.66-72
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    • 1993
  • Additive-pulse mode-locking (APM) was performed in a $1.053{\mu}m$ cw Nd:YLF laser by coupling a nonlinear external external cavity to the main cavity. The APM pulsewidth was 4.5 ps and the average output power was 1.5 W. This APM pulse was compressed by an optical fiber and a grating pair to be as short as 210 fs with a peak power of 17 kW.

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CORRELATION FUNCTIONS OF THE APM CLUSTERS OF GALAXIES

  • PARK CHANGBOM;LEE SUNGHO
    • Journal of The Korean Astronomical Society
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    • v.31 no.2
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    • pp.105-108
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    • 1998
  • We have found that the two-point correlation function of the APM clusters of galaxies has an amplitude much higher than that claimed by the APM group. As the richness limit increases from R = 53 to 80, the correlation length increases from 17.5 to 28.9 $h^{-1}Mpc$. This indicates that the richness dependence of the APM cluster correlation function is also much stronger than what the APM group has reported. The richness dependence can be represented by a fitting formula ro = 0.53dc + 0.01, which is consistent with the Bahcall's formula ro = 0.4dc. We have tried to find the possible reason for discrepancies. However, our estimates for the APM cluster correlation function are found to be robust against variation of the method of calculation and of sample definition.

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Synthetic Method of Aspartame via Oxidative Deformylation of N-Formyl Aspartame (N-포밀 아스파르테임의 산화 탈포밀 반응에 의한 아스파르테임의 제조 방법)

  • Park, Dong-Hyun;Lee, Yoon-Sik
    • Applied Chemistry for Engineering
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    • v.1 no.1
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    • pp.91-99
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    • 1990
  • For-${\alpha}$-APM was efficiently prepared by the reaction of For-Asp anhydride and Phe-OMe in methylethylketone, $CH_3CN$, and in water. The selective recovery of For-${\alpha}$-APM from the resulting For-${\alpha}$-APM and For-${\beta}$-APM mixture was possible via repetitive extraction at constant pH of 4.00. The oxidative deformylation was successfully performed by using several oxidants including $H_2_O2$/THF, sodium percarbonate, and $H_2_O2$/HCl/MeOH giving APM in high yields. The efficiency of the oxidative deformylation was raised in acidic condition for all the deformylation reactions.

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The Differences in APM, Perfectionism, and Stress Between the Scientifically Gifted and the Regular Students (과학영재와 일반학생의 지능, 완벽주의 성향 및 스트레스)

  • Kim, So-Ah;Park, Sang-Woo
    • Journal of Gifted/Talented Education
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    • v.17 no.1
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    • pp.173-191
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    • 2007
  • The purpose of this study is to find the difference in APM. perfectionistic tendencies, and stress between the scientifically gifted and the regular students. As a result, The scientifically gifted students showed higher in APM score. The scientifically gifted students showed higher in perfectionistic tendencies but no significant differences was found. On the contrary, the regular students showed significantly higher in stress. This research analyzed the hypothesis that the gifted students would receive higher score in perfectionism and the stress.

Changes of Aspartame during the Fermentation of Kimchi (김치 발효중 Aspartame의 분해)

  • Yu, Ju-Hyun;Ryou, Hyo-Sang;Kim, Myeong-Hee;Yoo, Haeng-Jun;Moon, Dong-Sang;Hwang, Kyu-In
    • Korean Journal of Food Science and Technology
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    • v.21 no.1
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    • pp.45-51
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    • 1989
  • To examine the potenital of APM as the sweetner of Kimchi, the change of APM (0.1%) added to Kimchi was monitore during the fermentation of Kimchi as $25^{\circ}C$. The content of APM added to Kimchi was ecreased to the extent of 20% after 20hrs by being decomposed into aspartylphenylalaine and phenylalanine. The decomposition degree of APM during the fermentation was only below 10% caused by the joint effects of lactic acid bacteria and pH and was disclosed as mainly led the reaction of enzymes contained in the raw chines cabbage. The decomposition of APM was inhibited by increasing the concentration of NaCl.

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Development of Solvent System for Enzymatic Synthesis of N-Benzoylaspartame (N-Benzoylaspartame의 효소적 합성을 위한 용매계의 선정)

  • Han, Min-Su;Kim, Woo-Jung
    • Korean Journal of Food Science and Technology
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    • v.24 no.5
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    • pp.504-510
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    • 1992
  • Several single or mixed water-miscible organic solvent systems were investigated to develop the most effective solvent system for enzymatic synthesis of N-benzoylaspartame(BzAPM). The BzAPM was prepared by immobilized thermolysin with using N-benzoyl-L-aspartic acid(Bz-Asp) and L-phenylalanine methyl ester(PheOMe). The solubilities of BzAPM and L-phenylalanine were highest in 4.5% methanol(1.89 and 1.79%, respectively) among the solvents system investigated while a mixed solvent system of 25% dimethyl sulfoxide(DMSO) and 20% polyethylene glycol(PEG) 200 showed relatively high values. The synthetic activity of BzAPM as well as initial reaction rate were found to be high in 45% methanol, 45% DMSO and a mixed solvent of 25% DMSO and 20% PEM 200. The imobilized thermolysin was most stable in 25% DMSO and 20% PEG 200 during storage at $40^{\circ}C$ for 42 days. PheOMe in the same solvent system was also found fairly stable against non-enzymatic decomposition at $40^{\circ}C$. Based on the synthetic efficiency and stability, the solvent system containing 25% DMSO and 20% PEG 200 was selected to be appropriate for the enzymatic synthesis of BzAPM.

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Synthesis of an Aspartame Precursor Using Immobilized Thermolysin in an Organic Solvent

  • Ahn, Kyung-Seop;Lee, In-Young;Kim, Ik-Hwan;Park, Young-Hoon
    • Journal of Microbiology and Biotechnology
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    • v.4 no.3
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    • pp.204-209
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    • 1994
  • The synthesis of N-(benzyloxycarbonyl)-L-aspartyl-L-phenylalanine methylester (Z-APM), a precursor of aspartame, from N-(benzyloxycarbonyl)-L-aspartic acid (Z-Asp) and L-phenylalanine methylester hydrochlolide($L-PM\cdot HCI$) was investigated in a saturated-ethylacetate single phase system using immobilized thermolysin. Among the various supports tested, glyceryl-CPG was found to be most efficient for retaining enzyme activity. The enzyme immobilized onto glyceryl-CPG also showed the highest activity for Z-APM synthesis in saturated ethyl acetate. Z-APM conversion yield in saturated ethylacetate was half of that obtained in an ethyl acetate-buffer two-phase system under the same reaction conditions. However, as the mole ratio of $L-PM \cdot HCI$ to Z-Asp was increased to 4.0, the conversion yield reached 95 %. When continuous synthesis of Z-APM was canied out in a plug flow reactor (PFR) with 80 mM of L-PMㆍHCI and 20 mM of Z-Asp in saturated ethylacetate (pH 5.5), more than 95 % of Z-Asp was converted to Z-APM with a space velocity of 1.16 $hr^{-1} at 40^{\circ}C$. Although the operational stability in PFR was reduced rapidly, more than 80% of initial activity was maintained in CSTR even after a week of operation.

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