• Title/Summary/Keyword: FT

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In situ FT-IR Study of 1,2-dichlorobenzene Decomposition over VOx/Mesoporous Titania by Prepared Spray Pyrolysis (분무 열분해법을 이용해 제조된 VOx/Mesoporous Titania 상에서 1,2-dichlorobenzene의 분해반응에 대한 in situ FT-IR 연구)

  • Jeon, Jong-Ki;Jung, Kyeong Youl;Park, Young-Kwon
    • Applied Chemistry for Engineering
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    • v.22 no.5
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    • pp.582-585
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    • 2011
  • In this study, surface-adsorbed species of 1,2-dichlorobenzene (1,2-DCB) on mesoporous $V_2O_5/TiO_2$ catalysts synthesized by spray pyrolysis were investigated through the adsorption/desorption performed using in situ FT-IR cell. Also, the comparison of adsorbed species with $TiO_2$ and $V_2O_5/TiO_2$ synthesized by the incipient wetness was carried out.

Hyper-elastic Model Haptic Feedback Using Finite Element Analysis (유한요소 해석을 이용한 초탄성체 햅틱 피드백 연구)

  • Park, Seunghyun;Kim, Jinhyun
    • Journal of Sensor Science and Technology
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    • v.31 no.4
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    • pp.260-265
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    • 2022
  • In this study, we establish hyper-elastic haptic feedback in a virtual environment using finite element analysis techniques and develop a Force Torque (FT) sensor utilization method for application in tele-operation environments. In general, regarding haptic feedback data, in a tele-operation environment, the user is provided with feedback according to the measured force data when the model is inserted through an FT sensor. Conversely, in a virtual environment, the press-fitting model can be expressed through the spring-damper system rather than an FT sensor to provide feedback. However, unlike rigid and the elastic bodies, the hyper-elastic body represented by a spring-damper system in a virtual environment is a simple impedance model using stiffness and damping coefficients; it is limited in terms of providing actual feedback. Thus, in this study, haptic feedback was implemented using the data obtained from POD-RBF analysis results during hyper-elastic press-fitting experiments. The haptic feedback mechanism developed in this study was verified by comparing the FT sensor feedback data measured and calculated through hyper-elastic press-fitting experiments with spring-damper feedback data. Subsequently, the POD-RBF analysis feedback was compared and evaluated against the feedback mechanism of each environment through the test subject, and the similarities between the POD-RBF analysis feedback and FT sensor data feedback were verified.

Comparison of event tree/fault tree and convolution approaches in calculating station blackout risk in a nuclear power plant

  • Man Cheol Kim
    • Nuclear Engineering and Technology
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    • v.56 no.1
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    • pp.141-146
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    • 2024
  • Station blackout (SBO) risk is one of the most significant contributors to nuclear power plant risk. In this paper, the sequence probability formulas derived by the convolution approach are compared with those derived by the conventional event tree/fault tree (ET/FT) approach for the SBO situation in which emergency diesel generators fail to start. The comparison identifies what makes the ET/FT approach more conservative and raises the issue regarding the mission time of a turbine-driven auxiliary feedwater pump (TDP), which suggests a possible modeling improvement in the ET/FT approach. Monte Carlo simulations with up-to-date component reliability data validate the convolution approach. The sequence probability of an alternative alternating current diesel generator (AAC DG) failing to start and the TDP failing to operate owing to battery depletion contributes most to the SBO risk. The probability overestimation of the scenario in which the AAC DG fails to run and the TDP fails to operate owing to battery depletion contributes most to the SBO risk overestimation determined by the ET/FT approach. The modification of the TDP mission time renders the sequence probabilities determined by the ET/FT approach more consistent with those determined by the convolution approach.

A Rapid Quantitative Assay of Intact Ambroxol Tablets by FT-NIR Spectroscopy

  • Kim, Do-Hyung;Ah, Woo-Young;Kim, Hyo-Jin
    • Proceedings of the PSK Conference
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    • 2003.10b
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    • pp.213.2-213.2
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    • 2003
  • A simple analytical procedure using FT-NIR for the rapid determination of individual ingredients was evaluated. Direct measurements were made by reflection using a reflectance accessory, by transmittance using tablet accessory and turn table. FT-NIR spectral data were transformed to the first derivative. Partial Least Square Regression(PLSR) was applied to quantify near-infrared (NIR) spectra of 2 ingredients. These calibration models were cross-validated (leave-one-out approach). The prediction ability of the models was evaluated on ambroxol tablets and compared with the real values in manufacturing procedure. (omitted)

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Middle distillate production by the hydrocracking of FT wax over solid acid catalysts (고체산 촉매상에서 FT WAX의 수소첨가 분해반응에 의한 중질유 생산)

  • Jeong, Heondo;Jung, Heon
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.114.2-114.2
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    • 2010
  • Fisher-Tropsch 반응을 통하여 생성되는 왁스는 황 또는 질소 성분을 포함하지 않으며 또한 방향족 및 중금속 성분이 없기 때문에 청정 수송유로써 사용이 가능하다는 장점이 있다. 그러나 Fisher-Tropsch 왁스는 그 분자량이 매우 큰 사슬형 탄화수소이기 때문에 수소첨가 분해반응을 통하여 중질유 range의 탄소수를 갖는 탄화수소로의 전환 기술이 반드시 필요하다. 이러한 수소첨가 분해반응에 사용되는 촉매는 강한 산점을 지니고 있는 양이온 교환 지르코니아가 대표적이라 할 수 있는데 최근 들어 강한 산점과 높은 산밀도, 그리고 기공의 모양과 크기에 따라 특정 반응이 제어되거나 활성화되는 형상선택성을 가지고 있기 때문에 다양한 반응에 촉매로 사용되는 제올라이트에 Pt 등의 귀금속을 담지한 촉매를 사용하여 Fisher-Tropsch 왁스의 전환율 및 중질유분의 선택도를 높이는 기술에 대한 연구가 활발히 진행되고 있다. 따라서 본 연구에서는 다양한 제올라이트 촉매에 귀금속을 담지하여 촉매를 제조하고 1L 급 고압 배치형 반응기를 이용하여 Fisher-Tropsch 왁스의 수소첨가 분해반응에 의한 중질유 제조 실험을 수행하고 그 결과를 고찰하였다.

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A study on the preparation of ${alpha}-Fe_2O_3$films by dip-coating method (Dip-coating법에 의한 ${alpha}-Fe_2O_3$막 제조에 관한 연구)

  • 강경원;정용선;현부성;오근호
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.8 no.2
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    • pp.292-298
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    • 1998
  • ${\alpha}-Fe_2O_3$films were prepared by a dip-coating method using the mixed solution of ferric nitrate, ethylene glycol and acethyl acetone. The polymerization effect of the mixed solution was studied by FT-IR spectroscopic analysis, and the decomposition of organic parts and crystallization of the dip-coated film were investigated by FT-IR, XRD and DSC. In addition, AFM and SEM were employed to analyze the surface roughness and the thickness of ${\alpha}-Fe_2O_3$films.

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FT-IR and Raman Spectroscopy for the Interaction between Poly(2-hydroxyethylmethacrylate) and Amino Acids (Poly(2-hydroxyethylmethacrylate)와 아미노산과의 상호작용에 관한 FT-IR과 Raman 분광학적 연구(II))

  • 김의락;정봉진
    • KSBB Journal
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    • v.11 no.5
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    • pp.557-564
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    • 1996
  • The interaction between poly(2-hydroxyethylmethacrylate)(poly(HEMA)) which is a material of contact lens containing approximately 45%o water and water soluble amino acids (alanine, arginine, glycine, lysine, methionine, proline, and serine) was investigated by using FT-IR and Raman spectroscopy. The results revealed that arginine and lysine had the strongest interaction with poly(HEMA) among amino acids. The interaction depended on the quantity of charges on ammo acids. They interacted predominately with hydroxyl groups in poly(HEMA).

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A Study on the rapid calculating of reliability for Fault Tree (FT의 빠른 신뢰도계산을 위한 연구)

  • 이일재;이광원
    • Journal of the Korean Society of Safety
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    • v.12 no.4
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    • pp.180-190
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    • 1997
  • A new method in the fault tree analysis (FTA) for the reliability calculation is suggested. Two steps are necessary in traditional method in evaluation of the occurrence probability of top event in fault tree (FT). The first step is to find the minimal outsets, and the second one is to substitute the result into the poincare equation. In order to reduce the enormous computing time of this method, lots of rapid algorithms have been developed. Almost of all achievements were, however, based on the partial structural properties of FT. In this paper, the FT is transformed to a non-linear graph G which has the same minimal outsets of original n, and then the reliability is calculated using the domination theory. In this new method, the required number of equation terms are at most $2^n$ (n is node number of graph G), while $2^m$-1 (m is the number of minimal cutsets) calculation terms are required in the poincare equation in traditional method. Since m>>n in general. our new method reduces the calculation time significantly.

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