• Title/Summary/Keyword: artificial source

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Studies on the Production of Chlortetracycline (Part 1) The Effect of Carbon Source and Mineral Ions (Chlortetracycline 발효에 관한 연구 (제1보) 탄소원과 2 가금속이온의 영향)

  • Kim, Seong-Ung;Dewey D.Y. Ryu
    • Microbiology and Biotechnology Letters
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    • v.6 no.3
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    • pp.103-108
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    • 1978
  • Improvement of fermentation medium for chlortetracycline production was attempted. Starch was a good carbon source for chiortetracycline production as compared with sucrose or glucose, although the cell yield from the starch medium was somewhat lower, and complexed natural medium was more suitable than artificial and simple one for this purpose. The concentrations of divalent ions, such as $Mg^{2+}$, M $n^{2+}$, Z $n^{2+}$, and F $e^{2+}$, affected the productivity of chlortetracycline. These mineral ions in excess of which was contained in natural medium such as corn flour and corn steep liquor, caused significant decrease in the productivity of chlortetracycline.cline.

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Control of Potato Virus Y (PVY-VN) with Mineral Oil Treatment in Tobacco Burley 21 Fields (담배(Burley 21) 포장에서 mineral oil 처리에 의한 감자바이러스Y(PVY-VN) 방제)

  • 채순용;김상석;김영호;박은경
    • Journal of the Korean Society of Tobacco Science
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    • v.23 no.2
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    • pp.115-122
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    • 2001
  • The effect of mineral oil treatment in Burley 21 tobacco field on the control of potato virus Y(PVY-VN) mostly transmitted by green peach apid(Myzus persicae Sulzer) in nature was studied and the virus infection in some plants including potato, pepper, bramble, radish, etc near the tobacco fields as a virus infection source was tested by capillary tube precipitatioin test with PVY-antibody and bioassay in Xanthi-nc tobacco. The main source of PVY-VN infection in tobacco field in korea was potato(ca. 40% of test plants infected). Pepper and bramble were also infected by PVY-VN. The control level of PVY-VN infection by treatment of 0.75% liquid mineral oil with 3 % nonionic emulsifier to the plants was 84.8 % in case of the artificial transfection with a infected apterous aphid in laboratory. However, the reduction of PVY-VN disease severity in tobacco fields treated with mineral oil at late June was only 35.5%. These results suggest that mineral oil treatment is not so effective for the protection of aphid-born virus(PVY - VN) infection in tobacco fields.

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Prestack migration using seismic interferometry (탄성파 간섭파를 이용한 중합전 구조보정)

  • Kim, Young-Wan;Jang, Seong-Hyung;Yoon, Wang-Jung;Suh, Sang-Yong
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.203-207
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    • 2008
  • Prestack depth migration is used to image for complex geological structure such as faults, folds, and subsalt. In this case, it is widely used the surface reflection data as a input data. However, the surface reflection data have intrinsic problems to image the subsalt and the salt flank due to the complex wavefields and multiples which come from overburden. For overcoming the structural defect of the surface reflection data in the imaging, I used the virtual sources in terms of seismic interferometry to image the subsurface and suppress the multiples using the velocity model of the lower part of the virtual sources. The results of the prestack depth migration using virtual source gathers and velocity model below receivers are similar geological interfaces to the results from shot gathers of the conventional ocean bottom seismic survey. And especially artificial interfaces by multiples were suppressed without applying any other data processing to eliminate multiples. This study results by numerical modeling can make a valuable imaging tool when it is applied to satisfied field data for specific condition.

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Electromagnetic Tomography Using Finite Element Method (유한요소법을 이용한 전자탐사 토모그래피 연구)

  • Son, Jeong-Sul;Song, Yoon-Ho;Kim, Jung-Ho
    • 한국지구물리탐사학회:학술대회논문집
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    • 2007.06a
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    • pp.185-190
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    • 2007
  • In this study, we developed the 2.5D EM modeling and inversion algorithm for cross-hole source and receiver geometry. Considering the cross-hole environment, we use a VMD (vertical magnetic dipole) as a source and vertical magnetic fields as a measuring data. Developed inversion algorithm is tested for the isolated block model which has a conductive and a resistivity anomaly respectively. For the conductive anomaly, its size and resistivity are inverted well on the inversion results, while for the resistive anomaly, the location of anomalous block is shown on the inverted section, but its values are far from the exact value. Furthermore, artificial conductive anomalies are shown around the resistive anomalous zone. If we consider the inversion artifact shown in the test inversion of restive block, it is almost impossible to image the resistive zone. However, the main target of EM tomography in the engineering problem is conductive target such as fault zone, and contaminated zone etc., EM tomography algorithm can be used for detecting the anomalous zone.

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Simulation of Ground Motions from Gyeongju Earthquake using Point Source Model (점지진원 모델을 이용한 경주 지진으로 인한 지반운동 생성)

  • Ha, Seong Jin;Jee, Hyun Woo;Han, Sang Whan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.20 no.7_spc
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    • pp.537-543
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    • 2016
  • In low to moderate seismic regions, there are limited earthquake ground motion data recorded from past earthquakes. In this regard, the Gyeongju earthquake (M=5.8)occurred on September 12, 2016 produces valuable information on ground motions. Ground motions were recorded at various recording stations located widely in Korean peninsula. Without actual recoded ground motions, it is impossible to make a ground motion prediction model. In this study, a point source model is constructed to accurately simulate ground motions recorded at different stations located on different soil conditions during the Gyeongju earthquake. Using the model, ground motions are generated at all grid locations of Korean peninsula. Each grid size has $0.1^{\circ}(latitude){\times}0.1^{\circ}(longitude)$. Then a contour hazard map is constructed using the peak ground acceleration of the simulated ground motions.

Review on the induced seismic event for artificial reservoir (인공저류층 생성을 위한 유도진동에 관한 사전연구)

  • Jeon, Jong-Ug;Myoung, Woo-Ho;Kim, Young-Deug
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.8 no.2
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    • pp.55-60
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    • 2012
  • In many cases, geothemal wells will not be opened up a geothermal reservoir under such conditions that an extraction of geothermal energy is economically viable without any further measures. Geothermal wells often have to be stimulated, in order to increase productivity. For the non-volcanic area, such as Korea, the hydraulic stimulation is necessary to complete geothermal power plant. The analysis of induced seismic event showed that the thermal resource might have a much wider extent and a much higher generation potential than previously assumed. In order to record compressional and shear waves emitted during fracture stimulation, three-component geophones are placed in a seismometer. The recorded data from one seismometer is the convolution of the source magnitude, the transmission media, and the sensitivity of the instrument.

Basic study on Eco-industrial Park utilizing thermal effluents as heat source (온배수를 열원으로 활용하는 생태산업단지 조성에 관한 기초 연구)

  • KIM, Dong-Kyu;KANG, Dae-Seok;CHUNG, Yong-Hyun
    • Journal of Fisheries and Marine Sciences Education
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    • v.21 no.3
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    • pp.400-408
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    • 2009
  • The purpose of this study is to know the concept of Eco-industrial Park and How to use the thermal effluents from power plants. Thermal effluents, which use sea water for cooling, from power plants have been discharged with about $6{\sim}7^{\circ}C$ higher temperature than near sea area. Therefore, it could effect on the marine ecosystem as a external pressure factor that increase the artificial thermal load in near sea area. The applications of thermal effluents had been surveyed through the several internal and external cases for utilizing heat sources and reducing the thermal load. As the precedence research for applying, the amount of heat sources of thermal effluents was evaluated. When the thermal effluents was fully applied in heat sources and available heat, assume that use heating season by 12 hours a day of demanded available heat, it was possible to calculate total 198 Tcal of energy saving.

Analysis of Magnetic Fields induced by Line Currants using Coupling of FEM and Analytical Solution (선전류에 의해 발생되는 자장의 해석을 위한 유한요소법과 해석해의 결합 기법)

  • Kim, Young-Sun;Lee, Ki-Sik
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1035-1037
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    • 2005
  • The analysis of magnetic fields(2-D) induced by line currents, such as Overhead Trolley Lines or Transmission Lines, is not so easy by using the standard Finite Element Method(FEM). Mesh generation is one of the most important processes in the standard FEM. Because, the current region is relatively small compared with whole region, and actually is a line without thickness, the mesh refinement around the source lines yields many demerits. A way of supplement such a defect, we proposed the coupling scheme of analytical solution and FEM. In this study, the analytical solution is adopted around the region of line currents and FE solution is a lied to the rest of source region. And the two types of solution are coupled at the artificial boundary. To verify the usefulness of proposed algorithm, simplified model with magnetic material in FE region is chosen and analyzed. The results are compared with those of standard FEM. And the errors between them can be reduced by increasing harmonic orders.

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NEW ASPECTS OF MEASURING NOISE AND VIBRATION

  • Genuit, K.
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1994.06a
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    • pp.796-801
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    • 1994
  • Measuring noise, sound quality or acoustical comfort presents a difficult task for the acoustic engineer. Sound and noise are ultimately jugded by human beings acting as analysers. Regulations for determining noise levels are based on A-weighted SPL measurement performed with only one microphone. This method of measurement is usually specified when determining whether the ear can be physically damaged. Such a simple measurement procedure is not able to determine annoyance of sound events or sound quality in general. For some years investigations with binaural measurement analysis technique have shown new possibilities for the objective determination of sound quality. By using Artificial Head technology /1/, /2/ in conjunction with psychoacoustic evaluation algorithms - and taking into account binaural signal processing of human hearing, considerable progress regarding the analysis of sounds has been made. Because sound events often arise in a complex way, direct conclusions about components subjectively judged to be annoying with regard to their causes and transmission paths, can be drawn in a limited way only. A new procedure, complementing binaural measurement technology combined with mulit-channel measuements of acceleration sensor signals has been developed. This involves correlating signals influencing sound quality, analyzed by means of human hearing, with signals form different acceleration sensors fixed at different positions of the sound source. Now it is possible to recognize the source and the transmission way of those signals which have an influence on the annoyance of sound.

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Development of Monitoring System Using Residual Gas Analyzer (RGA) and Artificial Intelligence Modeling (잔류가스 분석기(RGA)와 인공지능 모델링을 이용한 모니터링 시스템 개발)

  • Ji Soo Lee;Song Hun Kim;Gyeong Su Kim;Hyo Jong Song;Sang-Hoon Park;Deuk-Hoon Goh;Bong-Jae Lee
    • Journal of the Semiconductor & Display Technology
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    • v.23 no.2
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    • pp.129-134
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    • 2024
  • This study aims to talk about the necessity of solving the PFC gas emission problem raised by the recent development of the semiconductor industry and the remote plasma source method monitoring system used in the semiconductor industry. The 'monitoring system' means that the researchers applied machine learning to the existing monitoring technology and modeled it. In the process of this study, Residual Gas Analyzer monitoring technology and linear regression model were used. Through this model, the researchers identified emissions of at least 12700mg CO2 to 75800mg CO2 with values ranging from ion current 0.6A to 1.7A, and expect that the 'monitoring system' will contribute to the effective calculation of greenhouse gas emissions in the semiconductor industry in the future.

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