• Proceedings of the Materials Research Society of Korea Conference
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• 2002.11a
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• pp.95-95
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• 2002

• The Korean Journal of Food And Nutrition
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• v.8 no.3
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• pp.199-205
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• 1995

The study was carried out to compare the factors of overall preference In the sensory test to the analyzation of some compositions in the 7 kinds of old grasses : An Evening Primerose, a Spiderworts, the flower of a Convolvulus, So Ru Jang Yl, Shoe Bl Rum.O Yi Pul, Jip Sean Na Mul. Results were summaries as follows. 1. The Tannin contents of fresh sample and cooked samples were determined as 0.27~2.4g%, 0.25~1.439% respectively. The largest amount of fresh samples was contained In a Shoe Bi Rum. The smallest amount of them was in an Evening Primerose. The highest level of cooked samples was found in a Shoe Bi Rm, and the lowest was in the O Yi Pul. These results were similar to sensory test. 2. The free amino acid contents of 2 kinds of samples were determined as 25.15~179.5mg%, 1.86~13. 6mg% respectively. The largest amount of sweet taste of them was 0 Yi Pul and So Ru Jaeng Yl respectively. But So Ru Jaeng Yi is not appeared sweety becase this have much tannin. The smallest amount of sweet taste was a Spiderwort. The highest level of bitter taste was So Ru Jaeng Yl the and lowest was Jip Sean Na Mul. Among of them Jlp Sean Na Mul is similar to organoleptic test but So Ru Jaeng Yi is not strong bitter taste in sensory evaluation. The highest level of sour taste of cooked samples was So Ru Jaeng Yi and the lowest of them was Shoe Bi Rum. The reducing sugar contents of fresh sample and cooked samples were determined as 1.80~ 4.9g%, 1.84 ~3.579% respectively. The largest of fresh samples were So Ru Jaeng Yl and the lowest was Shoe Bi Rum. The highest of cooked samples were an Evening Primerose and the lowest was a Convolvulus. Among of these results an Evening Primerose was not similar to sensory test because it has much other components. The level of chlorophyll of fresh samples and cooked samples were determined as 11.7~39mg%, 11.3~40.3mg% respectively. The highest of fresh samples was Shoe Bl Rum and the lowest was J ip Sean Na Mul. The largest of cooked samples was So Ru Jaeng Yi and the lowest was a Jlp Seu Na Mul.

• Bulletin of the Korean Chemical Society
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• v.13 no.5
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• pp.491-498
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• 1992

Chelating triphosphines were applied to freeze the fluxionality and to minimize the number of isomers found in the monophosphine analogues and this technique was proved to be useful. RuH(NO)$P_3$($P_3$; Cyttp, ttp and etp) complexes were characterized to have similar trigonal bipyramidal structures with linear NO groups. Cyttp prefers to have a meridional geometry while etp prefers a facial one and ttp complexes are mixture of these two isomers. The crystal structure of RuH(NO)(Cyttp) has been determined to have a distorted trigonal bipyramidal structure with a linear NO in the equatorial plane. The crystals are orthorhombic, space group $P_{nma}$, with unit cell dimensions a = 16.356(2), b = 20.474(2), c = 10.915(l) ${\AA}$, V = 3655 ${\AA}^3$, Z = 4, R = 0.035 and $R_w$ = 0.034 for the 2900 intensities with $F_o^2 >3{\sigma}(F_o^2)$ and the 208 variables.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.11a
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• pp.217-217
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• 2003

초전도체 선재를 제작하기위해 YBa$_2$Cu$_3$$O_{7-x}$ (YBCO) 와 Ni substrates사이의 계면 문제를 해결하기 위한 buffer layer로써 CaRuO$_3$ (CRO) thu film이 제안되었는데, 이런 buffer layer의 조건으로는Ni metal과 YBCO superconductor사이의 화학적 반응이 없어야 하고 metal component가 YBCO로 diffusion되는 것을 막아주어야 하며 substrates의 산화를 막아주어야 한다. 이런 조건을 만족시키는 것 중에서 CRO thin film이 가장 적절하였지만, CRO의 orthorhombic구조의 distortion에 의만 lattice mismatch 문제가 발생하였다. 이러한 문제를 해결하기 위해 이론적인 구조 분석을 통한 CRO의superconductor buffer layer로써의 가능성을 검토해 보는 것이 목적이다.

• Bulletin of the Korean Chemical Society
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• v.33 no.11
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• pp.3831-3834
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• 2012

• Journal of the Korean Electrochemical Society
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• v.5 no.1
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• pp.21-26
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• 2002

A supercapacitor was developed using an amorphous ruthenium oxide material. The electrode of supercapacitor was prepared using an amorphous ruthenium oxide, which was synthesized from ruthenium trichloide hydrate$(RuCl_3{\cdo5}xH_2O)$. Thin film of tantalum was used as a current collector because it had wide. potential window characteristics than titanium and 575304 materials. A supercapacitor was assembled with ruthenium oxide as an electrode active material and 4.8M sulfuric acid solution as an electrolyte. The specific capacitance of the electrode was tested by a cyclic voltammetry using a half cell. The maximum differential specific capacitances during the oxidative and the reductive scans were 710 and $645\;F/g-RuO_2{\cdot}nH_2O$, respectively. The average specific capacitance was $521\;F/g-RuO_2{\cdot}nH_2O$. The assembled supercapacitor was protonated to the potential level of 0.5V vs. SCE. Super-capacitor, which was adjusted to the appropriate protonation level, had the specific capacitance of $151\;F/g-RuO_2{\cdot}nH_2O$ based on the concept of full cell.

• Journal of Korean Society of Forest Science
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• v.81 no.1
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• pp.11-20
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• 1992

This study was conducted to compare chlorophyll contents, photosynthetic abilities, and ribulose-diphosphate (RuDP) carboxylase activities of Quercus acutissima seedlings grown with and without cotyledons under different light intensities and different nutrient levels. The results obtained in this study were as follows : 1. Chlorophyll contents were not significantly different among the light intensities except for 25% of full sunlight at the last harvest time. 2. RuDP carboxylase activity increased with increasing light intensity. 3. Photosynthetic abilities of seedlings grown under full and 75% of sunlight were significantly higher than that under 25% of full sunlight. 4. RuDP carboxylase activity was more related with chlorophyll a contents(r=0.792) than chlorophyll b contents(r=0.314). 5. RuDP carboxylase activities of the seedlings received at 1 or 2% addition rates of nutrients under 75% of full sunlight were higher than that at 0.5% addition rates.

• Applied Chemistry for Engineering
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• v.10 no.3
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• pp.331-335
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• 1999

The transition metal oxides have been of interest as bifunctional electrocatalysts for bifunctional air electrodes. The amorphous citrate precursor (ACP) process has been optimized to prepare perovskite (La0.6Ca0.4CoO3) and pyrochlore (Pb2Ru2O6) powders with high surface area, and consequent improvement of The electrocatalytic performance in an air electrode with thermal treatment. PTFE -bonded gas diffusion electrodes loaded with perovskitc and pyrochlore catalysts showed good bifunctional performances. The electrodes were fairly stable up to 100 hour in the galvanostatic mode at ${\pm}25mA/cm^2$, from which these electrodes offer promise as practical bifunctional air electrodes.

• Bulletin of the Korean Chemical Society
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• v.12 no.6
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• pp.686-691
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• 1991

Emission quenching of photoexcited tris(${\alpha},{\alpha} '$-diimine)-ruthenium(II) complex cations, $RuL_3^{2+}$ (L: 2,2'-bipyridine, 4,4'-dimethyl-2,2'-bipyridine; 4,4'-diphenyl-2,2'-bipyridine; 1,10-phenanthroline; 5-methyl-1,10-phenanthroline; 5,6-dimethyl-1,10-phenanthroline or 4,7-diphenyl-1,10-phenanthroline) by $Cu^{2+}$, dimethylviologen $(MV^{2+})$, nitrobenzene (NB), and oxygen was studied in aqueous homogeneous and sodium dodecyl sulfate (SDS) micellar solutions. The apparent bimolecular quenching rate constants $k_q$ were determined from the quenching data and life-times of $^{\ast}RuL_3^{2+}$. In homogeneous media, the quenching rate was considerably slower than that for the diffusion-controlled reaction. The decreasing order of quenching activity of quenchers was $NB>O_2>MV^{2+}>Cu^{2+}$. The rate with $Cu^{2+}$ was faster as the reducing power of $^{\ast}RuL_3^{2+}$ is greater. On the other hand, the rates with NB and $O_2$ were faster as the ligand is more hydrophobic. This was attributed to the stabilization of encounter pair by van der Waals force. The presence of SDS enhanced the rate of quenching reactions with $Cu^{2+}$ and $MV^{2+}$, whereas it attenuated the quenching activity of NB and $O_2$ toward $RuL_3^{2+}$. The binding affinity of quenchers to SDS micelle and binding sites of the quenchers and $RuL_3^{2+}$ in micelle appear to be important factors controlling the micellar effect on the quenching reactions.

• Bulletin of the Korean Chemical Society
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• v.35 no.3
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• pp.793-797
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• 2014

To develop a methodology for absolute determination of the surface areal density of functional groups on organic and bio thin films, medium energy ion scattering (MEIS) spectroscopy was utilized to provide references for calibration of X-ray photoelectron spectroscopy (XPS) or Fourier transformation-infrared (FT-IR) intensities. By using the MEIS, XPS, and FT-IR techniques, we were able to analyze the organic thin film of a Ru dye compound ($C_{58}H_{86}O_8N_8S_2Ru$), which consists of one Ru atom and various stoichiometric functional groups. From the MEIS analysis, the absolute surface areal density of Ru atoms (or Ru dye molecules) was determined. The surface areal densities of stoichiometric functional groups in the Ru dye compound were used as references for the calibration of XPS and FT-IR intensities for each functional group. The complementary use of MEIS, XPS, and FT-IR to determine the absolute surface areal density of functional groups on organic and bio thin films will be useful for more reliable development of applications based on organic thin films in areas such as flexible displays, solar cells, organic sensors, biomaterials, and biochips.