• Title/Summary/Keyword: 이차분석

Search Result 1,500, Processing Time 0.025 seconds

Isolation and Optimal Culture Conditions of Prodigiosin-like Pigment Produced by Zooshikella sp. JE-34 (Zooshikella sp. JE-34가 생산하는 Prodigiosin계 색소의 분리 및 최적 배양조건)

  • Kim, Ju-Sang;Kim, Man-Chul;Lee, Kyeong-Jun;Heo, Moon-Soo
    • Microbiology and Biotechnology Letters
    • /
    • v.37 no.3
    • /
    • pp.219-225
    • /
    • 2009
  • A bacterial strain, JE-34, producing a high concentration of red pigment was isolated from a sediment in East China Sea. It was identified as Zooshikella sp. JE-34 based on the 16S rRNA gene sequence analysis. The red pigment was purified by solvent extraction and HPLC was identified as prodigiosin-like compound. Nutritional and cultural conditions were optimized for the production of prodigiosin-like pigment in the flask level. Optimal culture conditions were at initial medium pH $6.0{\sim}7.0$, $30^{\circ}C$ and 4 days incubation. For carbon and, nitrogen sources were soluble starch and malt extract.

A Minimun-diameter Spanning Tree with Bounded Degrees (제한된 분지수를 가지는 최소지름 신장트리)

  • 안희갑;신찬수
    • Journal of KIISE:Computer Systems and Theory
    • /
    • v.31 no.1_2
    • /
    • pp.78-85
    • /
    • 2004
  • Given a set S of n points in the plane, a minimum-diameter spanning tree(MDST) for the set might have a degree up to n-1. This might cause the degradation of the network performance because the node with high degree should handle much more requests than others relatively. Thus it is important to construct a spanning tree network with small degree and diameter. This paper presents an algorithm to construct a spanning tree for S satisfying the following four conditions: (1) the degree is controled as an input, (2) the tree diameter is no more than constant times the diameter of MDST, (3) the tree is monotone (even if arbitrary point is fixed as a root of the tree) in the sense that the Euclidean distance from the root to any node on the path to any leaf node is not decreasing, and (4) there are no crossings between edges of the tree. The monotone property will play a role as an aesthetic criterion in visualizing the tree in the plane.

Pulse Position Determination using Adaptive Threshold Detector (Adaptive Threshold Detector를 이용한 펄스 위치 계산)

  • Chagn, Jae-won;Lee, Sang Jeong
    • Journal of Advanced Navigation Technology
    • /
    • v.21 no.2
    • /
    • pp.163-170
    • /
    • 2017
  • MLAT which is an independent cooperative surveillance system is applied to increase the positon resoultin of secondary survelliance radar. MLAT uses the hyperboic or hyperboloid position mesurement algorithm. Central processing unit of MLAT calculates target position using time difference of arrival (TDOA) which can be solved from time of arrival (TOA) information of each receivers (at least 4 receivers). To increase position resolution of MLAT which use TDOA, TOA which is transfer time from tranmitter to receiver shold be calculated with precision time resolution in receiver. This paper explained the MLAT system briefly and explained ATD which is one of means of calcuating pulse position. ATD is applied to solve the deviation of pulse position due to different amplitude of signals in mulitiple receivers. In this paper, to analysis the performance of ATD, the simulation result of LAS and CDS was compared with the simulation result of basic threshold method.

Review of Rehabilitation Programs for Cancer survivors (암생존자의 재활을 위한 국내 프로그램 고찰)

  • Han, Jong Hee
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.17 no.12
    • /
    • pp.307-315
    • /
    • 2016
  • With advances in health care, the cancer survival rate has significantly increased. Even though cancer treatment has finished, cancer survivors may continuously suffer from physical and psychosocial problems. In order to investigate the problems cancer survivors have experienced, a comprehensive rehabilitation program must be developed. This study sought to determine the content and structure of rehabilitation programs for cancer survivors, analyze the effectiveness of such programs, and develop a basis for future comprehensive rehabilitation program development. Through this review, thirteen programs were selected and classified according to exercise, psychosocial, and integrated or comprehensive aspects. Exercise programs improve physical function, fatigue, and hormone-related cancer effects. Psychosocial programs improve quality of life, mood changes such as depression, anxiety, and post traumatic factors. Comprehensive programs improve both physical and psychosocial aspects.

Cyclicality of Inter-Industry Wage Gaps and Segmented Labor Market Hypotheses (산업간 임금격차의 경기변동상 변화 패턴과 분단노동시장 가설)

  • Shin, Donggyun
    • Journal of Labour Economics
    • /
    • v.26 no.3
    • /
    • pp.77-114
    • /
    • 2003
  • Analyses of the special data sets constructed from the National Longitudinal Survey of Youth and the Panel Study of Income Dynamics reveal that, compared with an annual wage measure, survey week wages are significantly counter-cyclically biased due to selecting workers with strong labor market attachment. We also find that survey week wages are more counter-cyclically biased in high-wage industries than in low-wage industries, that is, inter-industry gaps of survey week wages are counter-cyclically biased. Unlike existing longitudinal studies, the current study concludes that real wages are much more procyclical in high-wage industries than in low-wage industries, which is attributed to our adoption of annual wages that is less subject to the selectivity bias. Our finding is consistent with the empirical regularity that real wages are much more procyclical for men than for women, as men are overrepresented in industries with greater real wage procyclicalities. Overall, current results do not support the predictions of segmented labor market theories for the cyclicality of real wages.

  • PDF

A Study on Flow Characteristics according to Meandering Low Flow Channel Shape in the Compound Cross Section Typed Straight Channel (복단면인 직선수로 내 사행 저수로의 형태에 따른 흐름특성 연구)

  • Kim, Seonghwan;Choi, Gyewoon
    • Journal of Wetlands Research
    • /
    • v.19 no.4
    • /
    • pp.484-490
    • /
    • 2017
  • In order to examine flow characteristics according to the shape of the meandering low flow channel in the compound cross section typed straight channel, we assumed the representative channel type in Korea and confirmed the validity of the 3D numerical simulation by carrying out the hydraulic model. Based on this study, numerical simulations were also conducted on other types of river channel. As a result of the numerical model test (using the velocity value measured by the water depth observation from the hydraulic model test), it was confirmed that the numerical simulation results are in good agreement with the numerical simulation results. As a result of analyzing the flow field according to the changes in the shape of the low flow channel, it was confirmed that the secondary flow examined in the previous studies occurred. Also, it was confirmed that the maximum flow velocity point moves according to the expansion cross sectional area of flow in high flow plain. Ultimately, it is thought that it is necessary to understand the position of the water impingement (which is an important factor in river design) and the extent of the impact because the change of the channel width affects the flow.

Effect of medium pH on the extracellular production of red pigments using Monascus purpureus (Monascus purpureus 에 의한 세포외 적색색소 생산성 증가에 대한 배지내 pH 조절의 영향)

  • Park, No-Hwan;O, Yeong-Suk;Jeong, Uk-Jin
    • 한국생물공학회:학술대회논문집
    • /
    • 2000.11a
    • /
    • pp.321-324
    • /
    • 2000
  • The Effect of pH red pigment production by Monascus purpureus ATCC 16365 has been studied in pH-controlled batch fermenter culture. A maximum of yellow and red pigments were detected using UV-Vis spectrophotometer at 385nm and 495nm, respectively. Fungal growth and pigment production were favoured at low pH(pH 4.0-5.5). Especially extracellular formation rate of orange to yellow pigment was decreased compared with that of orange to red pigment at pH 7.0. In addition, the enhancement of ratio of extracellular to intracellular pigment and the red pigment production in pH 7.0-controlled batch fermenter was observed. However, the pH 7.0-controlled batch cultures depressed the total production of pigments. The pH change from 4.0 to 7.0 during batch fermenter cultivations sharply increased both red pigment production and the extracellular composition.

  • PDF

Synthesis and Electrochemical Characteristics of Silicon/Carbon Anode Composite with Binders and Additives (Silicon/Carbon 음극소재 제조 및 바인더와 첨가제에 따른 전기화학적 특성)

  • Park, Ji Yong;Lee, Jong Dae
    • Korean Chemical Engineering Research
    • /
    • v.56 no.3
    • /
    • pp.303-308
    • /
    • 2018
  • Silicon/Carbon (Si/C) composite as anode materials for lithium-ion batteries was synthesized to find the effect of binders and an electrolyte additive. Si/C composites were prepared by two step method, including magnesiothermic reduction of SBA-15 (Santa Barbara Amorphous material No. 15) and carbonization of phenol resin. The electrochemical performances of Si/C composites were investigated by charge/discharge, cyclic voltammetry and impedance tests. The anode electrode of Si/C composite with PAA binder appeared better capacity (1,899 mAh/g) and the capacity retention ratio (92%) than that of other composition coin cells during 40 cycles. Then, Vinylene carbonate (VC) was tested as an electrolyte additive. The influence of this additive on the behavior of Si/C anodes was very positive (3,049 mAh/g), since the VC additive is formed passivation films on Si/C surfaces and suppresses irreversible changes.

Electrochemical Performance of Graphite/Silicon/Carbon Composites as Anode Materials for Lithium-ion Batteries (리튬이온배터리 Graphite/Silicon/Carbon 복합 음극소재의 전기화학적 성능)

  • Jo, Yoon Ji;Lee, Jong Dae
    • Korean Chemical Engineering Research
    • /
    • v.56 no.3
    • /
    • pp.320-326
    • /
    • 2018
  • In this study, Graphite/Silicon/Carbon (G/Si/C) composites were synthesized to improve the electrochemical properties of Graphite as an anode material of lithium ion battery. The prepared G/Si/C composites were analyzed by XRD, TGA and SEM. Also the electrochemical performances of G/Si/C composites as the anode were performed by constant current charge/discharge, rate performance, cyclic voltammetry and impedance tests in the electrolyte of $LiPF_6$ dissolved inorganic solvents (EC:DMC:EMC=1:1:1 vol%). Lithium ion battery using G/Si/C electrode showed better characteristics than graphite electrode. It was confirmed that as the silicon content increased, the capacity increased but the capacity retention ratio decreased. Also, it was shown that both the capacity and the rate performances were improved when using the Silicon (${\leq}25{\mu}m$). It is found that in the case of 10 wt% of Silicon (${\leq}25{\mu}m$), G/Si/C composites have the initial discharge capacity of 495 mAh/g, the capacity retention ratio of 89% and the retention rate capability of 80% in 2 C/0.1 C.

A study on the Capacity Fading Mechanism of Sulfur Cathode Depending on Discharge Potential for Li Rechargeable Battery (Li 이차전지용 유황 양극의 방전 전위에 따른 퇴화거동에 관한 연구)

  • Kim, Hyun-Seok;Han, Sang-Cheol;Song, Min-Sang;Kim, Jin-Ho;Ahn, Hyo-Jun;Lee, Jai-Young
    • Journal of Hydrogen and New Energy
    • /
    • v.14 no.1
    • /
    • pp.46-52
    • /
    • 2003
  • 유황 양 전극과 액체 전해질, 리튬 금속을 음극으로 사용한 리튬 유황 전지를 제조하여 그 특성을 조사하였다. 유황 전극은 유황파우더와 carbon black 을 도전재로, 그리고 바인더로 PVdF를 사용하여 제조하였다. 이렇게 제조된 셀은 두개의 다른 전압 구간에서 충방전 실험을 행하였다. 첫 번째 셀은 $S_8+{\chi}Li{\leftrightarrow}Li_2S_x(X=4{\sim}12)$ 반응만을 일어나 게 하기 위하여 2.1V 와 2.5V 사이에서, 그리고 두 번째 셀은 $Li_2S_x+{\chi}Li{\leftrightarrow}Li_2S(x=2{\sim}4)$의 반응만을 일어나게 하기 위하여 1.5V 와 2.5V 에서 충방전 하였다. 그 결과 첫 번째 셀이 더 좋은 싸이클 특성을 가지는 것을 확인 탈 수 있었다. 각 전압구간에서 각 셀이 충방전 되는 동안, 전해질 내로 녹아난 유황의 양은 큰 차치가 없는 것을 확인하였다. 그리고, 전압에 따른 전극의 임피던스를 측정한 결과, 방전이 끝난 후 큰 저항성분이 새로 생긴 것을 확인 할 수 있었다. 이는 사이클이 진행된 후의 전극표면을 SEM 분석을 행한 결과로부터 사이클이 진행된 후 전극 표면에 최종 반응 산물인 $Li_2S$ 가 피막형태로 형성된것을 확인 할 수 있었다.