• Journal of Plant Biotechnology
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• v.37 no.4
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• pp.414-424
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• 2010

This report describes recent advances in tissue culture, genetic transformation of commercial rose (Rosa hybrida) and in development of new rose cultivars by molecular breeding. Rose is one of major cut-flowers in global horticulture industry. Successful progresses were made in development of new cultivars for pathogen resistant, environmental stress resistant and petal color modification by molecular breeding. New cultivars, however, has not reported yet in korea, although lots of progresses were achieved in each field of conventional breeding, tissue culture and genetic transformation. Cooperation in these research fields will promote screening of useful genes to have specific traits on rose and exploiting of processes to improve in the efficiency of tissue culture and genetic transformation of rose, therefore, we hopefully expect that new rose cultivars by molecular breeding will be released in the near future.

• Korean Journal of Breeding Science
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• v.40 no.1
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• pp.54-57
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• 2008

The New bicolor spray rose (Rose hybrida Hort.) cultivar was developed by line selection in 2000 at the Flower Breeding Research Institute, Gyeongnam ARES. Characteristics were investigated three times from 2003 to 2006. 'Yellow King' was crossed between 'Spring Time' and 'Flair' and it has a Yellow Orange-group color (RHS No. 16A), few thorns and spray flower with a good harmony between ray floret and flower center. The vase life of cut flower was 9.1days. It was registered as commercial cultivar in 2006. This new cultivar could be planted in most of greenhouse production region of Korea and will be released to general rose growers in 2007.

• Analytical Science and Technology
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• v.12 no.3
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• pp.209-217
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• 1999

To elucidate the decay of the rose bengal (RB) sensitized and thiourea (TU) supersensitized photocurrent, spectroscopic analyses of the dye solution were performed. Absorption and fluorescence spectroscopic analyses of sensitizing solution before and after irradiation enabled to conform the new mechanism of the photocatalytic dimerization between RB and TU. And it was also found that the geometrical arrangement of the transition dipole moment is oblique and the angle between the dipoles is $124^{\circ}$ in the dimer of dye molecules.

• Analytical Science and Technology
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• v.11 no.1
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• pp.20-28
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• 1998

Fluorimetric and absorption spectroscopic studies were performed to elucidate the photocurrent decay with time in the conversion process of solar energy into electrical energy using a photoelectrochemical cell containing rose bengal as a sensitizer, and allylthiourea as a supersensitizer. Spectra of dye solution before and after irradiation revealed a new photocatalytic dimerization reaction between sensitizer and supersensitizer. It was also found that the geometrical arrangement of the transition dipoles is oblique in the dimer of dye molecules.

• The Korean Journal of Community Living Science
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• v.15 no.1
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• pp.67-76
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• 2004

In order to promote the value of the flowers as new agricultural products, we investigated the biological activities of rape, arrowroot, and rose extracts. Biological activities investigated included antioxidant activity and the effects on 3T3-L1 fibroblast cells. When each flower was extracted with methanol, the antioxidant index and electron donating activity of roses was the highest $(IC_{50}$ of rose extract was $17.6 \mu{g}/m\ell$). When 3T3-L1 fibroblast cells were treated with extracts made with hexane, ethyl acetate, and ether, the rape extracts had a cytotoxic effect on the cells. 12.2% of cells survived when treated with a 3mg/$m\ell$ ether extract while those treated with the same concentration of hexane and ethyl acetate had survival rates of 76.2% and 78.6% respectively. In contrast to rape, the ether extract of arrowroot and rose stimulated the growth of 3T3-L1 cells. The effect of rose extracts was much bigger than those of other extracts. Although every rose extract stimulated the growth of the 3T3-L 1 cells, the ether extract stimulated growth up to 168.6% compared to the control at the concentration of $0.3mg/m\ell$, and 148.3% at the concentration of $1mg/m\ell$. The toxicity on cells treated with $H_2 O_2$ of $450\mu{M}l$was decreased with the addition of rose extract. The survival rate after treatment with rose extract at the concentration of $100\mu{g}/m\ell$ was increased to 71% compared to the 32% survival rate of control. From these results, it can be concluded that the extracts of arrowroot and rose seem to stimulate cells, whereas the extract of rape has a cytotoxic effect. Biological activities of ether extract were the strongest compared to those of other extracts at the tested concentrations.

• Analytical Science and Technology
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• v.6 no.3
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• pp.313-318
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• 1993

The rose petal tissue biosensor has been constructed by immobilizing New carina rose tissue. Optimum conditions for the determination of urea were investigated using this sensor. Selectivity and life time of this sensor were also obtained. As a result, the biosensor showed the optimum response characteristics in 0.20M phosphate buffer solution at pH 8.0, $37^{\circ}C$ and 50mg of tissue amounts. This sensor was linear from $9.0{\times}10^{-5}$ to $4.0{\times}10^{-3}M$ urea with a slope of 42mV/decade. The limit of detection and response time are $7.0{\times}10^{-5}M$ and 17~19 min.

• Applied Biological Chemistry
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• v.50 no.2
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• pp.132-135
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• 2007

The effects of rose flower extracts on the growth of CHO cells were examined. Rose flower extracts were prepared by solvent extraction with hexane, ethylacetate and ether from five domestic rose cultivar, Rosa hybrida L. cv. Mihyang, Noeul, Redqueen, Whitelady and Pinklady, respectively. The effects of rose flower extracts on the growth of CHO cells were measured using MTT colormeteric assay and compared with control. Extracts of rose flowers showed stimulative effect or inhibitory effect on the growth of CHO cells depending on the kinds of solvent and concentration of extracts. Ether extracts of rose flower showed a more effective stimulative effect on the growth of CHO cells at the concentration of 5 ${\mu}g{\cdot}ml^{-1}$. These results suggest that rose flower has the simulating activity on the growth of CHO cells and a potential as new functional food source.

• FLOWER RESEARCH JOURNAL
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• v.18 no.2
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• pp.147-150
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• 2010

A new cultivar potted miniature rose (Rosa hybrida) 'Tiny Ball' was selected out of cross combination 1999 and 2002 at Gumi Floricultural Experiment Station. Characteristics trials were conducted three times from 2003 to 2006. 'Tiny Ball' came from the combination that '990905' crossed to 'Manish'. New cultivar has pink and white flower color and the shape of flower is similar to tiny ball. The number of flower petals and flowers per pot are more than those of 'POULra022' as comparison cultivar. This cultivar has low plant height without treatment of plant retardant materials, so the high quality grade ratio of potted rose is higher than that of comparison cultivar.

• The Journal of the Korea Contents Association
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• v.18 no.8
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• pp.525-535
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• 2018

If the frequency of a particular class is excessively higher than the frequency of other classes in the classification problem, data imbalance problems occur, which make machine learning distorted. Corporate bankruptcy prediction often suffers from data imbalance problems since the ratio of insolvent companies is generally very low, whereas the ratio of solvent companies is very high. To mitigate these problems, it is required to apply a proper sampling technique. Until now, oversampling techniques which adjust the class distribution of a data set by sampling minor class with replacement have popularly been used. However, they are a risk of overfitting. Under this background, this study proposes ROSE(Random Over Sampling Examples) technique which is proposed by Menardi and Torelli in 2014 for the effective corporate bankruptcy prediction. The ROSE technique creates new learning samples by synthesizing the samples for learning, so it leads to better prediction accuracy of the classifiers while avoiding the risk of overfitting. Specifically, our study proposes to combine the ROSE method with SVM(support vector machine), which is known as the best binary classifier. We applied the proposed method to a real-world bankruptcy prediction case of a Korean major bank, and compared its performance with other sampling techniques. Experimental results showed that ROSE contributed to the improvement of the prediction accuracy of SVM in bankruptcy prediction compared to other techniques, with statistical significance. These results shed a light on the fact that ROSE can be a good alternative for resolving data imbalance problems of the prediction problems in social science area other than bankruptcy prediction.

• Journal of Bio-Environment Control
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• v.14 no.3
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• pp.174-181
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• 2005

Experiments were carried out to develop an optimal nutrient solution for the single-stemmed rose (Rosa hybrida L.) 'Red velvet' in a closed aeroponic system. Plants were grown in 1/3, 1/2, 1, or 3/2 strength of the nutrient solution of National Horticultural Research Station in Japan (NHRS). Significantly less changes of pH and EC ($dS{\cdot}m^{-1}$) in the drainage were observed in 1/2 strength treatment as compared to other treatments. The $NO_3-N$, K, Ca, and Mg concentrations in the drainage solution of 1/2 strength treatment were maintained at optimal levels. These results indicated that the rose uptakes of both nutrients and water was more stable than those in other concentration. The concentration of macronutrients in nutrient solution were adjusted based on the ratio of nutrient:water (n/w) taken up by plants grown in the 1/2 strength solution. The composition of the new solution (classified the University of Seoul (UOS) solution) was as follow; $NO_3-N$ 8.8, $NH_4-N$ 0.67, P 2.0, K 4.8, Ca 4.0, Mg 2.0 $me{\cdot}L^{-1}$. To further evaluate new solution on crop growth, the rose 'Red Velvet' was grown again in l/2, 1, and 2 strength UOS solution to compare with 1.0 strength PBG (proefstion voor bloemisterij en glasgroenpe) solution. Overall the plant growth, including the stem length and number of five-leaflet leaves was higher in 1.0 strength of UOS solution than other treatments. Results presented in this study indicate that the nutrients in the UOS solution are well balanced for the single-stemmed rose in the closed aeroponic system.