• Title/Summary/Keyword: 초기대수

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A 3D Magnetic Inversion Software Based on Algebraic Reconstruction Technique and Assemblage of the 2D Forward Modeling and Inversion (대수적 재구성법과 2차원 수치모델링 및 역산 집합에 기반한 3차원 자력역산 소프트웨어)

  • Ko, Kwang-Beom;Jung, Sang-Won;Han, Kyeong-Soo
    • Geophysics and Geophysical Exploration
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    • v.16 no.1
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    • pp.27-35
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    • 2013
  • In this study, we developed the trial product on 3D magnetic inversion tentatively named 'KMag3D'. Also, we briefly introduced its own function and graphic user interface on which especially focused through the development in the form of user manual. KMag3D is consisted of two fundamental frame for the 3D magnetic inversion. First, algebraic reconstruction technique was selected as a 3D inversion algorithm instead of least square method conventionally used in various magnetic inversion. By comparison, it was turned out that algebraic reconstruction algorithm was more effective and economic than that of least squares in aspect of both computation time and memory. Second, for the effective determination of the 3D initial and a-priori information model required in the execution of our algorithm, we proposed the practical technique based on the assemblage of 2D forward modeling and inversion results for individual user-selected 2D profiles. And in succession, initial and a-priori information model were constructed by appropriate interpolation along the strke direction. From this, we concluded that our technique is both suitable and very practical for the application of 3D magentic inversion problem.

과학기술위성 1호의 탑재 컴퓨터 운용 상황

  • 박홍영;류상문;강경인;김경희;김세일;신근수;이종주;오대수;임종태
    • Bulletin of the Korean Space Science Society
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    • 2004.04a
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    • pp.54-54
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    • 2004
  • 과학기술위성 1호는 2003년 9월에 발사 후 초기 운용 단계를 거쳐 현재 정상적인 임무수행 단계이다. 위성의 주 컴퓨터 시스템은 각 탑재체들이 임무를 원활히 수행하도록 위성의 건강 상태를 감시하고, 시나리오에 따라 각 탐재체들을 제어하고, 각종 위성 관측 자료를 수집하며, 위성의 임무 수행을 위한 명령을 송수신 한다. 본 발표에서는 지난 6개월간 위성의 운용을 위하여 지상으로부터 명령을 수신하고, 수신된 명령을 동작순서에 따라 각 서브시스템에 전달하는 위성의 주 컴퓨터 운용과 관련하여 운용현황을 살펴본다. (중략)

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병원성 비브리오균의 용혈독소와 단백분해효소에 관한 연구

  • 박미연;김현진;장동석
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2002.10a
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    • pp.177-178
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    • 2002
  • 병윈성 비브리오균의 병원인자에는 hemolysin, protease, phospholipase A2, siderophore 외에도 콜레라균 만이 생산하는 cholera toxin 등이 있다. 이 중에서도 대부분의 병원성 비브리오균에서 생성되는 대표적인 인자는 hemolysin과 protease로 알려져 있다. Hemolysin은 혈액을 분해하는 독소로서 병원성 비브리오균의 분리ㆍ동정에 널리 이용 되고 있다. Hemolysin은 균의 배양초기에서 부터 서서히 생성되기 시작하여 대수증식기 말에 최대의 활성을 나타내며 안정기에 접어들면서 활성이 급격히 감소되는 것으로 보고되고 있다 (Kim et al., 1997). (중략)

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TPH, $CO_2$ and VOCs Variation Characteristics of Diesel Contaminated Aquifer by In-situ Air Sparging (공기분사공정에 의한 유류오염대수층의 TPH, $CO_2$, VOCs 변화 특성)

  • Lee, Jun-Ho;Park, Kap-Song
    • Journal of Soil and Groundwater Environment
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    • v.11 no.6
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    • pp.18-27
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    • 2006
  • Air Sparging (IAS, AS) is a ground-water remediation technique, in which organic contaminants are volatilized into air as they rise from saturated to vadose soil zone. This study was conducted to investigate the variation characteristics of TPH, VOCs and $CO_2$ for air sparging of diesel contaminated saturated soil. Initial TPH concentration was 10,000 mg/kg for saturated soil phase and 1,001 mg/L for soil aquifer phase. After 36 days of air sparging, the equilibrium temperature of 2-Dimension experiment system was $24.9{\pm}1.5^{\circ}C$. The saturated soil TPH concentration (in the C10 port close to air diffuser) was reduced to 66.0% of the initial value. The mass amount of $CO_2$ was 3,800 mg and 3,200 mg in air space (C70 port) and in unsaturated soil zone (C50 port), respectively. The VOCs production kinetic parameter was 0.164/day in the air space (C70 port) and 0.182/day in the unsaturated soils (C50 port).

Unsteady Groundwater Flow in Aquifer (대수층의 부정류에 관한 연구)

  • 이정규
    • Water for future
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    • v.22 no.2
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    • pp.233-239
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    • 1989
  • The partial differential equation of the groundwater flow was reduced to an ordinary differential equation by the Boltzmann transformation. Its numerical solutions were obtained by the finite difference method and the new method to get the initial missing slope using the Richardson method and the finite difference equation was proposed. The solutions computed by the newly proposed method were compared with investigator's computations and they showed a satisfactory agreement and that the proposed method is easy and simple to get solutions.

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Research on Teaching Method for the Properties of Arithmetic Based on Analysis of Elementary School Mathematics Textbooks (교과서 분석에 기초한 연산법칙의 지도 방안 탐색)

  • Chang, Hyewon
    • Journal of Elementary Mathematics Education in Korea
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    • v.21 no.1
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    • pp.1-22
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    • 2017
  • The properties of arithmetic are considered as essential to understand the principles of calculation and develop effective strategies for calculation in the elementary school level, thanks to agreement on early algebra. Therefore elementary students' misunderstanding of the properties of arithmetic might cause learning difficulties as well as misconcepts in their following learning processes. This study aims to provide elementary teachers a part of pedagogical content knowledge about the properties of arithmetic and to induce some didactical implications for teaching the properties of arithmetic in the elementary school level. To do this, elementary school mathematics textbooks since the period of the first curriculum were analyzed. These results from analysis show which properties of arithmetic have been taught, when they were taught, and how they were taught. Based on them, some didactical implications were suggested for desirable teaching of the properties of arithmetic.

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The Solution of Upward Salt Diffusion in Floodeol Soil using Laplace Transformation (침수상태(湛水狀態)에서 토양(土壤) 염분(鹽分) 확산(擴散) 상승(上昇) 해석(解析)에 Laplace변환 이용)

  • Oh, Yong-Taeg;van der Molen, W.H.
    • Korean Journal of Soil Science and Fertilizer
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    • v.28 no.3
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    • pp.233-240
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    • 1995
  • Fick's diffusion equation was transformed into algebraic subsidiary equation with its initial and boundary conditions through Laplace transformation, and the subsidiary equation was transformed back on the basis of Burington's table of inverse transformations so that it became the solution of Fick's equation. The initial and boundary condition was for upward diffusion of salts into flooding water of constant depth from uniform polder soil of infinite depth containing constant concentration of salt. The derived solution was tested through comparison for its conformability with other solutions of simpler initial and boundary conditions. The importance of shallow transplanting of rice seedlings and salt removing by growing rice was mentioned on the basis of very slow desalting rate by diffusion calculated from the derived solutions.

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Effect of Glutamic Acid on Polysaccharide Production from Agaricus blazei in Liquid Culture

  • Hwang, Jeong-Min;Im, Yeong-Su;Gwon, Myeong-Sang;Choe, Jeong-U;Han, Jin-Su;Hong, Eok-Gi
    • 한국생물공학회:학술대회논문집
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    • 2000.04a
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    • pp.231-234
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    • 2000
  • The polysaccharide has been known to have an antitumor activity, which were extracted from the fruiting bodies, mycelia, and culture broths of Agaricus blazei. For the cell growth and the polysaccharide production, the optimal medium contained 8% glucose, 2% yeast extract, 0.1% $MgSO_4{\cdot}7H_2O$, 0.2% $KH_2PO_4$, 0.2% $CaCl_2{\cdot}2H_2O$ and 0.2% $MnSO_4{\cdot}5H_2O$. When 0.2% of glutamic acid was added at 4day, the cell concentration was 13.5 g/L and the polysaccharide production was 9.9 g/L, respectively.

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Efficient 3-D Near-field Source Localization Algorithm Using Uniform Circular Array (환형배열센서를 이용한 근거리 표적의 효율적인 3차원 위치추정 알고리즘)

  • 이정훈;박규태;박도현;이균경
    • The Journal of the Acoustical Society of Korea
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    • v.23 no.3
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    • pp.214-220
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    • 2004
  • A computationally efficient algorithm is presented for 3-D near-field source localization using a uniform circular away (UCA). Algebraic relations are demonstrated between the incident angles (elevation angle and azimuth angle) under the far-field assumption and the actual near-field location (range. elevation angle, and azimuth angle). Using these relations as paths to follow to the peak of the 3-D MUSIC spectrum, the proposed algorithm replaces the 3-D search required in the conventional 3-D MUSIC with a 1-D path following after a 2-D initialization. thereby reducing the computational burden.

Isolation and Characterization of Thermophilic Bacillus licheniformis YJ09 from Spent Mushroom (Pleurotus ostreatus) Substrates (느타리 수확후배지로부터 분리된 고온성 Bacillus licheniformis YJ09의 특성)

  • Kim, Hye Soo;Kim, Chul Hwan;Cho, Soo Jeong
    • Journal of Mushroom
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    • v.14 no.4
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    • pp.244-248
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    • 2016
  • In order to isolate thermophilic bacteria with high activity of CMCase and xylanase, spent mushroom substrates was collected from an oyster mushroom cultivation farm in Jinju, Gyeongnam, Korea. Among the isolates, one strain designated as YJ09 was selected by agar diffusion method. The isolate YJ09 was identified as a member of Bacillus licheniformis based on biochemical characteristics using Bacillus ID kit and MicroLog system. Comparative 16S rDNA sequence analysis showed that isolate YJ09 formed a distinct phylogenetic tree within the genus Bacillus and was most closely related to Bacillus licheniformis with sequence similarity of 98.9%. Based on its physiological properties, biochemical characteristics and phylogenetic distinctiveness, the isolate YJ09 was classified as Bacillus licheniformis. The CMCase and xylanase activity of B. licheniformis YJ09 was slightly increased corresponding to the bacterial population from exponential phase to stationary phase in the growth curve of B. licheniformis YJ09.