• Journal of Electrochemical Science and Technology
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• v.11 no.2
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• pp.165-171
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• 2020

The electrochemical preparation and spectroscopic characterisation of iridium-antimony (Ir-Sb) species is important owing to their potential applications as nanostructure materials. Nanostructures, i.e. nanoflower and nanodisk, of Ir-Sb were electrodeposited on conductive substrates using a practical electrochemical method based on the simultaneous underpotential deposition (UPD) of Ir and Sb from the IrCl₃ and Sb₂O₃ at a constant potential. Electrochemical UPD mechanism of Ir-Sb was studied using cyclic voltammetry and potential-controlled electrochemical deposition techniques. Herein, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectron and Raman spectroscopy were used to determine the morphological and structural properties of the electrochemically-synthesised Ir-Sb nanostructures.

• Journal of The Korean Astronomical Society
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• v.29 no.spc1
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• pp.257-258
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• 1996

1607 OH/IR stars associated with IRAS sources are assembled and the IRAS LRS spectra of 980 OH/IR stars are examined in this paper. The nature of the circumstellar dust for these sources is classified. The distributions of these subgroups of OH/IR stars in the IRAS color-color diagram and the period-color diagram are interpreted with their evolutionary status. The Galactic and the velocity distributions of these subgroups of OH/IR stars are also presented. The correlations among the expanding velocities of the envelopes, colors, periods and the pumping efficiencies for subgroups of OH/IR stars are investigated to outline the evolutionary status of OH/IR stars.

• Journal of Korea Multimedia Society
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• v.17 no.11
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• pp.1270-1278
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• 2014

The modern infrared (IR) imaging systems use mainly one or more wavelength bands among short wavelength IR (SWIR), middle wavelength IR (MWIR), and long wavelength IR (LWIR) bands. In the process of IR image synthesis and modeling, IR image wavelength-band conversion which transforms arbitrary band image to other band one is required. The wavelength-band conversion procedure includes a temperature estimation process of an object surface. However, in this procedure, an approximated Planck's radiation equation causes errors in estimated temperature. In this paper, we propose an estimation temperature error attenuation method in IR image band conversion procedure. The estimated temperature is corrected with a slope information of radiance according to it. The corrected temperature is used for generation of the other band IR image. The verification of proposed method is demonstrated through the simulation.

• Journal of the Korean Vacuum Society
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• v.5 no.1
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• pp.67-72
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• 1996

$RU_{1-x}Ir_xO_2$ films were deposited on the quartz substrate by a spray pyrolysis method. The x-ray diffraction patterns showed that the structure of the $RU_{1-x}Ir_xO_2$ film was tetragonal and the lattice constant $a_o$ and $c_o$ were increased from 4.495 A to 4.058 A and from 3.092A to 3.156 A, respectively as the Ir composition varied from 0.0 to 1.0. The $RU_{1-x}Ir_xO_2$ film was metallic and the resistivity of the samples was increased from $7{\times}10^{-5}{\Omega}\textrm{cm}$ to $48{\times}10^{-5}{\Omega}\textrm{cm}$ with increasing the Ir x. The surface of the sample was slightly roughed, the grain size and the grain boundary width were increased as the Ir composition varied from 0.0 to 1.0.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.05b
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• pp.373-378
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• 1997

시험가동중인 다목적연구용 '하나로'를 이용하여 근접치료용으로 사용되는 $^{192}$ IR seed 제조실험을 하였다. '하나로'의 특성을 고려하여 제작된 조사표적용기에 표적용 Ir seed를 넣고 밀봉한 후 He 누출시험을 통과한 표적만 원자로의 HTS 조사공에서 중성자 조사시켰다. HTS 조사공의 평균 열중성자속은 측정결과 원자로출력 15 MWt일 때 2.54 $\times$ $10^{13}$ n/$\textrm{cm}^2$.sec였다. 5회에 걸쳐 5개의 조사표적을 사용하여 총 200개의 $^{192}$ Ir seed를 제조, 실험하였으며 2시간 조사후 14일간 냉각시킨 Ir seed의 r-ray spectrum을 분석한 결과 $^{l92}$Ir외의 불순핵종은 검출되지 않았다. Ir seed의 방사능은 이온전리함을 사용하여 측정하였으며 방사능 측정결과 개별 $^{192}$ Ir seed의 방사능값은 평균 방사능값으로부터 $\pm$5 % 이내오차의 방사능 균일도를 갖는 것이 확인되었다.차의 방사능 균일도를 갖는 것이 확인되었다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.9 no.4
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• pp.97-109
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• 2014

The purpose of this study is, as to verify the effect of IR announcements, the IR activity to look at the usefulness. In previous study, they found that the IR announcement leads to reductions in information asymmetry, effect to positive stock price. This study examine the abnormal returns between group by corporate characteristics. The data used in this study are daily stock market returns taken from the KOSDAQ listed company with IR announcements during the 2005-2012 year(8 year). We find that follows. First, the capital market is accepted IR activity as the positive information. Second, abnormal returns of small company is higher than big size that. We show the difference of abnormal returns between the venture company and general company, the venture company's high. The abnormal returns of corporate with high ownership is above the group of low ownership. Additionally, consider interaction by firm characteristics, we show the interaction between firm size and business type. The result of two-way ANOVA is that venture corporate with big size are more abnormal returns than others. Also, we demonstrate that firm location is the factor of difference on information effect in venture firm.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.36 no.6
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• pp.568-575
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• 1991

The morpho-anatomical characteristics of panicle in rice plant is generally correlated with the number of spikelets and grain weight per panicle. For the increase of grain yield potential in rice, a low -tillering plant type with large panicles has been suggested as an ideotype. This study was conducted to investigate the panicle morphology and peduncle anatomy of different tillers within a plant in low -and high-tillering cultivars and their relationships on the number of spikelets and grain weight per panicle. A low-tillering, large panicled IR25588 was compared with a high-tillering. small panicled IR58. IR25588 had more inner(IVB) and outer vascular bundles (OVB). bigger peduncle diameter and peduncle thickness just below the panicle neck node than IR58. The top six tillers(M. P1, P2, P3. P4 and S1P2) within a plant had more IVB and OVB. larger peduncle diameter and thickness than the rest of the tillers in both cultivars. Tillers that emerged earlier had more IVB and OVB than tillers that emerged Jater. The total number of primary and secondary rachis-branches of IR25588 was much higher than that of IR58. IR25588 had more number of spikelets per panicle than IR58. and the top six panicles showed more spikelets per panicle than the rest of the panicles in both cultivars. The peduncle diameter was more important than peduncle thickness on the spikelet differentiation and panicle weight. especially in low-tillering cultivars. The number of IVB and OVB were highly correlated with the number of rachis-branches. spikelets and grain weight per panicle. The number of spikelets per IVB and spikelets per primary branch were higher in IR25588 than IR58 indicating the higher sink strength in low -tillering with large panicled cultivars than in high-tillering with small panicled cultivars. Based on the morpho-anatomical characteristics of a low-tillering cultivar and the top six tillers within a plant. the present results could be support that 'a low-tillering sturdy culms with large panicles' is an ideo-type of rice plant for increasing grain yield potential.potential.

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.154.1-154.1
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• 2000

• Journal of the Korean Magnetics Society
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• v.15 no.5
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• pp.265-269
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• 2005

Exchange bias effect of a various layered thin films were studied by FMR measurment. In plane angular dependence of a resonance field distribution which measured by FMR was analysed as a combined effect of an unidirectional anisotropy and an uniaxial anisotropy. Exchange biased NiFe/IrMn, IrMn/NiFe/IrMn, and NiFe/IrMn/CoFe thin films showed larger unidirectional anisotropy field and uniaxial anisotropy field with compared to that of an unbiased NiFe single thin film. In case of NiFe/Cu/IrMn, the film with thick Cu layer exhibited a similar trend to the unbiased NiFe thin film. NiFe/IrMn/CoFe thin film showed two resonance field distribution due to different ferromagnetic layers. In additon to the resonance field, the line width was also analysed with related to exchange bias effect.

• Journal of Environmental Science International
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• v.29 no.10
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• pp.943-949
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• 2020

In this work, we prepared a heterojunction anode with a surface layer of SnO₂-Sb-Ni (SSN) on a Ti/IrO₂ electrode by thermal decomposition to improve the electrochemical activity of the Ti/IrO₂ electrode. The Ti/IrO₂-SSN electrode showed significantly improved electrochemical activity compared with Ti/IrO₂. For the 0.1 M NaCl and 0.1 M Na₂SO₄ electrolytes, the onset potential of the Ti/IrO₂-SSN electrode shifted in the positive direction by 0.1 V_SCE and 0.4 V_SCE, respectively. In 2.0-2.5 V voltages, the concentration in Ti/IrO₂-SSN was 2.59-214.6 mg/L Cl₂, and Ti/IrO₂ was 0.55-49.21 mg/L Cl₂. Moreover, the generation of the reactive chlorine species and degradation of Eosin-Y increased by 3.79-7.60 times and 1.06-2.15 times compared with that of Ti/IrO₂. Among these voltages, the generation of the reactive chlorine species and degradation of Eosin-Y were the most improved at 2.25 V. Accordingly, in the Ti/IrO₂-SSN electrode, it can be assumed that the competitive reaction between chlorine ion oxidation and water oxidation is minimized at an applied voltage of 2.25V.