• East Asian Economic Review
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• v.21 no.3
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• pp.259-274
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• 2017

This study estimates the random utility function of fluid milk using 1,165 survey responses in Laos. It finds that both products' attributes and individual characteristics affect consumers' preference for the milk and the hypothetical brand of Laos-Korea has a potential compared to four real dairy products. Results also show that calories have a positive relationship with consumer's preference while the price and fat content have a negative one. The decision for choosing each brand is significantly affected by individual characteristics such as gender, age, whether or not respondents live with their children, the level of education, income, the frequency of purchasing milk per week, and the region where they live. The preference for five brands appears in the order of Foremost, Nabong, Thai-Danish, Meiji, and Lao-Korea, and probabilities of purchasing each brand at the mean level are 30.9%, 17.48%, 21.48%, 15.0% and 10.39%, respectively. Nabong that was Lao national milk brand still has a significant market power even though it was closed in 2008. The policies to promote milk industry by implementing its national milk brand again would be more effective if it focuses on the young generation, female consumers, families with children, quality of dairy products, and Vientiane capital areas.

• Journal of the Korean Applied Science and Technology
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• v.29 no.2
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• pp.302-310
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• 2012

Bio assay of mercury and cadmium ions were searched using voltammetric analysis using DNA doped carbon nanotube paste electrodes (DCP). The square-wave stripping voltammetryic optimized results indicated working ranges of 1-10.0 $ngL^{-1}$ and 20-100 $ugL^{-1}$, Hg(II) Cd(II) within an accumulation time of 120 seconds, in 0.1-M phosphate buffer solutions of pH 6.3. The relative standard deviations of 5 $ngL^{-1}$ Hg(II) and Cd(II) that observed were 0.14 and 0.22% (n=12), respectively, using optimum conditions. The low detection limit (S/N) was pegged at 0.1 $ngL^{-1}$ ($4.9{\times}10^{-11}M$) Hg(II) and 0.2 $ngL^{-1}$ ($1.77{\times}10^{-10}M$) Cd(II). The developed methods can be applied to assays in biological fish kidneys and water samples.

• Fisheries and Aquatic Sciences
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• v.20 no.11
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• pp.28.1-28.17
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• 2017

Members of the phylum Echinodermata, commonly known as echinoderms, are exclusively marine invertebrates. Among the Echinodermata, sea cucumber belongs to the family Holothuroidea. The sea cucumber Stichopus (Apostichous) japonicus (Selenka) is an invertebrate animal inhabiting the coastal sea around Korean, Japan, China, and Russia. Sea cucumber has a significant commercial value, because it contains valuable nutrients such as vitamins and minerals. They possess a number of distinctive biologically and pharmacologically important compounds. In particular, the body wall of sea cucumber is a major edible part. It consists of peptide, collagen, gelatin, polysaccharide, and saponin, which possess several biological activities such as anti-cancer, anti-coagulation, anti-oxidation, and anti-osteoclastogenesis. Furthermore, the regenerative capacity of sea cucumber makes it a medically important organism. This review presents the various biological activities and biomedical potential of sea cucumber S. japonicus.

• Transactions of the KSME C: Technology and Education
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• v.5 no.1
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• pp.69-77
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• 2017

Nanotechnology, along with Information Technology (IT) and Bio-technology (BT), has been regarded as a core area that will drive technological revolution of $21^{st}$ century. South Korea and other countries with advanced scientific and technological research programs are investing heavily in the field, and among its various aspects, nanomaterial industry is considered to be at the heart of this global competition. In this review, we look at nanomaterials industry from the perspective of mechanical engineering. Nanomaterials exhibit unique characteristics differing from those of micron, or sub-micron sized materials, and hence are potentially able to open up new opportunities. Specifically, environmental and biological sciences, energy, and catalysis are areas that are expected to benefit from these developments.

• Membrane and Water Treatment
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• v.5 no.4
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• pp.265-279
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• 2014

Pervaporation is the most promising technique for the recovery of ethanol from the fermentation system. To date, extensive research has been conducted on the exploration of membrane materials with favorable properties. In this paper, we primarily review the performance of adsorbent-filled rubbery membranes. In addition, the fundamental mechanisms of ethanol and water molecules transportation through composite membranes are demonstrated, particularly from the perspective of cluster formation. Finally, future prospects are also analyzed to develop the guidelines for the future development of excellent membrane materials for ethanol concentration. This paper is not meant to be an exhaustive overview, rather a specialized summary that allows readers to select the information appropriated to their topics.

• Journal of the Optical Society of Korea
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• v.17 no.4
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• pp.300-304
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• 2013

Novel breakthrough random-hole optical fibers (RHOFs) are fabricated in a draw tower facility, by tapering an optical fiber preform packed with a silica powder mixture capable of producing air holes in situ at the high temperature of tens of hundreds in degrees Celsius. Structural and propagation characteristics of the porous RHOF are explained briefly. Experimental investigations of the invented RHOF are performed for pressure sensor applications. Remarkable results are obtained for the RHOF with desirable pressure sensitivity independent of temperature, as is required for harsh conditions as in oil reservoirs.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.844-847
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• 2014

'Healthcare 3.0' paradigm, which comes from the convergence of medical and department of ICT(Information and Communication Technology), meets the government's 'creative economy'. It has emerged as new higher value-added markets and industries, created jobs, and got the 'land of opportunity'. Despite of the global recession, the health care market in the world from 2009 to now has earned a steady growth. The annual growth rate in domestic industrial scale is expected to more than 10% higher based on 153 trillion won in 2010. In particular, combination of health care and ICT, BT(BioTechnology), NT(NanoTtechnology), which is so called 'super-convergence', leap in the health care industry, is expected to open up a new paradigm. In addition, by 2020 all of the health care industry, the IT convergence industries account for the largest proportion, and more than 50,000 of the employment are to be expected. In this study, we survey and analyze problems of medical and IT convergence technology, the future of the medical and health care industry, the demanded healthcare IT staff, finally suggest education plan of human resources required in convergence industry of medical and IT.

• Journal of Digital Convergence
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• v.16 no.7
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• pp.213-222
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• 2018

The purpose of the study is to promote the expansion of educational environment and students' competence through the application of smart learning. In G University in 2017, 118 freshmen in the department of Chemical-bio engineering who were taking Calculus I class were divided into 2 groups of experimental and control group. The study analyzed the effect of the various learning experience using educational technology and the interaction in the class through SNS on students' visual understanding and academic achievement. The result shows that the students' academic achievement and satisfaction in the experimental group were higher than those in the control group. This verifies the potential of smart learning in the field of mathematics in the tertiary level and suggests strategies for high quality smart learning.

• Korean Journal of Microbiology
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• v.41 no.2
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• pp.105-111
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• 2005

Streptomyces produces many kinds of secondary-metabolites including antibiotics. Screening of a new compound and elucidation of a biosynthetic pathway for the secondary metabolites are very important fields of biology, however, there is a main problem that most of the identified compounds are already researched compounds. To solve these problems, a microarray system that is based on the data related to the biosynthetic genes for secondary-metabolites was designed. For the main contents of DNA microarray, the important genes for the bio-synthesis of aminoglycosides, polyenes group, enediyne group, alpha-glucosidase inhibitors, glycopeptide group, and orthosomycin group were chosen. A DNA microarray with 69 genes that were involved in the bio-synthesis for the antibiotics mentioned above was prepared. The usability of the DNA microarray was confirmed with the chromosomal DNA and total RNA extracted from S. coelicolor whose genomic sequence had already been reported.

• Journal of Life Science
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• v.29 no.6
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• pp.631-636
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• 2019

A new nitric oxide-induced (NOI) gene was isolated by screening ESTs from a cDNA library of dehydration-treated fibrous roots of sweetpotato (Ipomoea batatas). The 720 bp cDNA fragment, IbNOI, was sequenced, from which a 77 amino acid residue protein was deduced. A search of the protein BLAST database identified significant similarity to other plant NOI protein sequences. Quantitative RT-PCR analysis revealed diverse expression patterns of IbNOI in various tissues of the intact sweetpotato plant, and in leaves exposed to different stresses. The IbNOI gene was highly expressed in storage roots and suspension-cultured cells. In leaf tissues, IbNOI showed strong expression during sodium nitroprusside (SNP)-induced NO accumulation and chemical stress treatments. Expression of IbNOI was also induced under various abiotic stress conditions, such as dehydration, salt, and bacterial pathogen infection. These results suggest that IbNOI is involved in plant responses to diverse abiotic stresses and pathogen infection through a NO-related pathway.