• 제목/요약/키워드: Separation System

검색결과 2,419건 처리시간 0.027초

Blind Source Separation of Acoustic Signals Based on Multistage Independent Component Analysis

  • SARUWATARI Hiroshi;NISHIKAWA Tsuyoki;SHIKANO Kiyohiro
    • Proceedings of the Acoustical Society of Korea Conference
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    • 한국음향학회 2002년도 하계학술발표대회 논문집 제21권 1호
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    • pp.9-14
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    • 2002
  • We propose a new algorithm for blind source separation (BSS), in which frequency-domain independent component analysis (FDICA) and time-domain ICA (TDICA) are combined to achieve a superior source-separation performance under reverberant conditions. Generally speaking, conventional TDICA fails to separate source signals under heavily reverberant conditions because of the low convergence in the iterative learning of the inverse of the mixing system. On the other hand, the separation performance of conventional FDICA also degrades significantly because the independence assumption of narrow-band signals collapses when the number of subbands increases. In the proposed method, the separated signals of FDICA are regarded as the input signals for TDICA, and we can remove the residual crosstalk components of FDICA by using TDICA. The experimental results obtained under the reverberant condition reveal that the separation performance of the proposed method is superior to that of conventional ICA-based BSS methods.

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Enantiomeric Separation of Free Amino Acids Using N-alkyl-L-proline Copper(Ⅱ) Complex as Chiral Mobile Phase Additive in Reversed Phase Liquid Chromatography

  • Lee Sun Haing;Oh Tae Sub;Lee Hae Woon
    • Bulletin of the Korean Chemical Society
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    • 제13권3호
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    • pp.280-285
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    • 1992
  • Enantiomeric separation of free amino acids has been achieved by a reversed phase liquid chromatography with addition of a Cu(Ⅱ) complex of N-alkyl-L-proline (alkyl: propyl, pentyl or octyl) to the mobile phase. The amino acids eluted were detected by a postcolumn OPA system. N-alkyl-L-proline was prepared and used as a chiral ligand of Cu(Ⅱ) chelate for the enantiomeric separation. The concentration of the Cu(Ⅱ) chelate, the organic modifier and pH affect the enantiomeric separation of free amino acids. The retention behaviour, varied with change in pH and the concentration of the Cu(Ⅱ) chelate, was different compared with those of the derivatized amino acids. The elution orders between D- and L-forms were consistent except histidine showing that L-forms elute earlier than D-forms. The retention mechanism for the enantiomeric separation can be illustrated by the stereospecificity of the ligand exchange reaction and the hydrophobic interaction between the substituent of amino acids and reversed phase, $C_18$.

Preparation of Microporous Silica Membrane from TEOS-$H_2O$ System and Separation Of $H_2$-$N_2$ Gas Mixture (TEOS-$H_2O$계로부터 다공성 실리카 막의 제조 및 수소-질소 혼합기체의 분리)

  • 강태범;이현경;이용택
    • Membrane Journal
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    • 제10권2호
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    • pp.55-65
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    • 2000
  • The porous silica membrane was prepared from Si(${OC}_2H_5)_4-H_2O$ system by sol-gel method. To investigate the characteristics of gels and porous silica membrane, we examined gels and porous silica membrane using TG-DTA, X-ray diffractometer, IR spectrophotometer, BET, SEM and TEM. The optimum mole ratio of Si(OC$_2$H$_{5}$)$_4$ : $H_2O$ $C_2$H$_{5}$OH for porous silica membrane was 1 : 4.5 : 4. The porous silica membrane was obtained by heat treatment of the gel above 700 $^{\circ}C$. The specific surface area of sintered gel was 3.8 $m^2$/g to 902.3 $m^2$/g at 100 $^{\circ}C$ to 1100 $^{\circ}C$ The pore size of sintered gel was in the range 20 $\AA$~ 50$\AA$. The particle size of sintered gel was 15 nm to 30 nm at 30$0^{\circ}C$ to 700$^{\circ}C$. The performance of the porous silica membrane was investigated for the separation of $H_2$/$N_2$ gas mixture. Gas separation through porous silica membrane depends upon Knudsen flow and surface flow. The veal separation factor($\alpha$) of $H_2$/$N_2$ was 5.17 at 155.15 cmHg and $25^{\circ}C$. The real separation factor($\alpha$), head separation factor($\beta$), and tail separation factor( $\bar{B}$) increased as the pressure of permeation cell Increased.sed.

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Separation characteristics of separation devices using inlet water mixed with exhalation gases without a compressor (날숨이 혼합된 물을 사용한 압축기없는 용존기체 분리기의 분리 특성)

  • Heo, Pil Woo
    • Journal of Advanced Marine Engineering and Technology
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    • 제40권9호
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    • pp.842-846
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    • 2016
  • It's possible for a human to breathe under water, but the amount of dissolved oxygen in the water is small and a large amount of water is necessary to obtain sufficient dissolved oxygen from water. So, large separation system with large water pumps, having large surface areas, and large battery sources are needed. Exhalation gases are used to solve this problem. Theses gases contain some oxygen, nitrogen, and carbon dioxide; they contain less oxygen and more carbon dioxide compared to air. Therefore, reduction of the amount of carbon dioxide is necessary. If exhalation gases are employed appropriately, the separation device can be made more compact. Inlet water mixed with exhalation gases is supplied into the separation device, and dissolved gases are separated from the mixed water as it passes through the device. The inlet part of a typical separation system with a water delivery pump before the membrane module has more than one atmosphere. Hence, a compressor is used to mix the exhalation gases. In this study, the pressure at the inlet due to the use of a suction pump after the membrane module was less than one atmosphere; hence, compressors were not required. Separation characteristics were studied using a separation device without a compressor. The use of exhalation gases led to an increase in the amount of dissolved gases being separated. As the amount of inlet exhalation gases was increased, the separation of dissolved gases was increased as well.

Ground Separation Test to Verify Separation Stability of External Fuel Tank (외부연료탱크의 분리 안정성 검증을 위한 지상 분리시험)

  • Kim, Hyun-gi;Hong, Seung-ho;Ha, Byung-geun;Kim, Sung-chan;Lee, Jun-won
    • Journal of Aerospace System Engineering
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    • 제16권3호
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    • pp.99-104
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    • 2022
  • Aircraft pylon connects the engine or external stores to the main wing, and transfers the load acting on the pylon to the main structure of the aircraft. In particular, it should perform the function of separating the external store mounted on the pylon in case of emergency or mission performance. At this time, if the separation of the external store is not performed properly due to peripheral air flow or functional problems during the separation process of the external store, it may seriously impact the survivability of the aircraft. For this reason, to apply an external attachment to an aircraft, it is necessary to prove the stability of the external attachment in the separation situation in advance. In this paper, we present the result of the ground separation test performed to confirm that the external fuel tank, which is an external attachment, can be safely separated from the pylon. As a result of the test, the separation movement of the external fuel tank was measured with a high-speed camera, and the stability of the separation of the external fuel tank from the pylon were confirmed through the ground separation test. Additionally, the test result provides basic data for the stability evaluation of the separation of external attachments in actual aircraft.

The Study on Train Separation Control Technology using Balise for Conventional Line Speed Up (기존선 속도 향상을 위한 발리스를 이용하는 열차간격제어 기술에 대한 연구)

  • Baek, Jong-Hyen;Lee, Chang-Goo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • 제10권2호
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    • pp.256-263
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    • 2009
  • KORAIL carries out an improvement project of railway signaling system for the conventional line from the existing method which permits a train to move within limited speed the ground signal of ATS(Automatic Train Stop) system. The proposed system makes possible that a train can be driven using a speed profile created by onboard signaling system(ATP) with the movement authority from ground balise. A driving test over 100,000km is being executed by developing a tilting train for the speed elevation on the conventional line. And, the introduction of the tilting train by ATP system to the Jung-ang line is expected. However, a speed elevation on a curved line section has a restriction. Therefore, research on safety braking model and train separation control technology for the localization of ATP system is required preferentially. In this paper, we presented a safety braking model of ATP system and a train separation control method that use ground balise as variable information provider, and executed a performance simulation.

Monitoring of phase separation between silk fibroin and sericin using various dye system

  • Kwak, Hyo Won;Lee, Ki Hoon
    • International Journal of Industrial Entomology and Biomaterials
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    • 제30권1호
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    • pp.1-5
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    • 2015
  • Understanding the interactions between fibroin and sericin is crucial in solving the mechanism of silk spinning. In this study, various commercially available dyes were used to monitor the interface between fibroin and sericin during the gelation of fibroin. The phase separation between fibroin and sericin could be observed by the addition of azo dyes over a certain molecular weight. Furthermore, the addition of the dyes to the sericin layer showed vivid phase separation over addition to the fibroin layer.

Optimization of Cutoff Shields in Projection Headlight Systems to Achieve High Intensity Gradient and Low Color Separation at the Cutoff Line

  • Joo, Byung-Yun;Ko, Jae-Hyeon
    • Journal of the Optical Society of Korea
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    • 제20권1호
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    • pp.118-124
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    • 2016
  • The shape and location of the cutoff shield in a projection-type headlight system were optimized by a ray-tracing technique. A shield based on a Petsval surface showed better cutoff characteristics than a flat or cylindrical shield, such as a sharp intensity gradient and less color separation at the cutoff line. Adjustment of the shield’s location between the reflector and the aspheric lens further improved its cutoff characteristics.

The treatment of coolant wastewater of rolling plate process by High Gradient Magnetic Separation

  • Kim, Tae-Hyung;Ha, Dong-Woo;Kwon, Jun-Mo;Sohn, Myung-Hwan;Baik, Seung-Kyu;Oh, Sang-Soo;Ko, Rock-Kil;Kim, Ho-Sup;Kim, Young-Hun;Park, Seong-Kuk
    • Progress in Superconductivity and Cryogenics
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    • 제11권4호
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    • pp.8-11
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    • 2009
  • This study introduced wastewater treatment method by High Gradient Magnetic Separation (HGMS). HGMS treatment was high efficient method for various industrial wastewaters. The system is currently research state, but we have surveyed commercialize the technology for industry. In rolling plate process, coolant wastewater was recycled by sedimentation and sand filter system. It needs several large reservoirs and long time to remove suspended solid (SS) like metal fines and iron oxide in hot rolling plate making process. If removing rate of suspended solid in rolling coolant wastewater is improved by using HGMS system, the productivity of working process can be increased and the area of reservoir can be reduced. We manufactured high temperature superconducting HGMS system that had a purpose to treatment of coolant wastewater in rolling plate process. We fabricated the prototypes of magnetic matrix filter consisting of stainless steel 430 mesh, which is a core component in the magnetic separation system, In our basic preliminary experiment using HGMS system, it has been clear that the fine paramagnetic particles in the coolant wastewater obtained from rolling plate process of POSCO can be separated with high efficiency.

Separation of Functionalized Heterocyclic Compounds by High Performance Liquid Chromatography(I) (고성능 액체 크로마토그래피에 의한 기능성 헤테로고리화합물의 분리(I))

  • Lee, Kwang-PilI;Cho, Yun Jin;Lee, Young Cheol
    • Analytical Science and Technology
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    • 제10권6호
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    • pp.408-417
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    • 1997
  • Normal phase or reversed phase liquid chromatographic separation of some structural isomers of functionalized heterocyclic compounds has been carried out by using several different columns and various mobile phases. The optimal experimental conditions for separation of structural isomers were found on a ternary solvent system including alcohol as a modifier. This polar modifier is preferentially adsorbed onto strong adsorption site, leaving a more uniform population of weaker site that then serve to retain the sample. This 'deactivation' of the adsorbent leads to a number of improvements in subsequent separations. The optimal mobile phase system of separation were found on normal phase on structural isomers. Retention mechanism of normal phase system was also studied depending on adsorption strength between solute and stationary phase of column. However, retention factors of reversed phase system were found on hydrophobic interaction with solvophobic effect.

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