• Journal of Industrial Convergence
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• v.20 no.4
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• pp.7-14
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• 2022

The decrease in the school-age population caused the closure of private universities, but the guidelines at closed private universities are ambiguous, causing confusion. Therefore, this study intends to suggest a plan to utilize the closed school university. The government aims to increase the possibility of selling closed schools by preventing alley slums through the recovery of alley commercial districts and local communities. The data were collected through a Google survey from September 30 to October 8, 2021 and an on-site interview conducted on October 2, 2021. A total of 84 nearby citizens of the closed school university were surveyed, and on-site interviews were conducted with a total of five people. The collected data suggested the direction of utilization plan for closed school building. This study will present a model for the use of closed school property in the future and contribute to the establishment of urban regeneration policies.

• Applied Chemistry for Engineering
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• v.3 no.1
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• pp.7-17
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• 1992

The acid stronger than $H_0=-11.93$, which corresponds to the acid strength of 100% $H_2SO_4$, is known as superacid. However, solid superacid catalysts have many advantages such as an easy separation of products from catalyst, the repeated uses and regeneration of catalysts, as compared with liquid superacids. In this paper, the kinds of solid superacids, the preparation methods, and their applications for chemical reactions are introduced.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.1
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• pp.412-418
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• 2012

This paper suggests some strategies for the regional regeneration of Dongincheon Railway station and surrounding area. One is the reduction of the regional unbalance in those divided into two parts, the other is multi-dimentional plan through the efficient land-use on the side area of railway. For these regional refurbishment Plan, organizing the integrated transit system for the passenger's convenience, connecting existing commercial area and existing northen station square, modernization and improvement of environment are suggested.

• Journal of Industrial and Engineering Chemistry
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• v.67
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• pp.210-218
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• 2018

Ethylenediaminetetraacetic acid (EDTA)-functionalized KIT-6 and KCC-1 mesoporous silicas were prepared via post-synthesis grafting and examined for their ability to promote the recovery of rare earth metal ions such as $Nd^{3+}$ from an aqueous medium. The obtained adsorption isotherms were fitted to the Langmuir model, which gave a maximum adsorption of $Nd^{3+}$ ions of 109.8 and 96.5 mg/g for KIT-6-EDTA and KCC-1-EDTA, respectively, at $25^{\circ}C$ and pH 6. The adsorption kinetic profile of KIT-6 was faster than KCC-1. KIT-6 was also proved to be more stable against desorption under acidic regeneration conditions.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.12
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• pp.5165-5176
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• 2010

This study is an attempt to seek ways to revitalize the main streets in local city with regard to urban regeneration. It focuses on the case of Myeong-dong Fashion Street located in front of Cheonan Station, which recently lost its vitality. In order to explore causes of the decline and solutions for restore, this paper investigate the concerned urban area by approaching through three different aspects: physical and environmental aspects, social and economic aspects, historic and cultural aspects. In addition, the street visitors were surveyed on their visiting patterns, priorities and discontents about the components of street, and preferences for its restoring, etc. The investigation resulted in following findings and proposals. In physical and environmental dimension, it is needed to create legal incentives for encouraging local residents to develop their own district, and suggested to plan green space for relaxation and cultural arts space by using existing buildings, along with the expansion of public parking. In regard of social economic aspects, it is proposed to give each street specialized commercial theme. At the historic and cultural level, it is suggested to plan the pedestrian network which links the Fashion Street with surrounding historic elements.

• Proceedings of the Korean Society of Crop Science Conference
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• 2017.06a
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• pp.171-171
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• 2017

Propagation by crown division in Platycodon grandiflorum is too slow for producing many plants in a short time although the plants are uniform. This study was performed to enhance the mass propagation for Platycodon grandiflorum containing yellow green petals via various medium compositions and the growth regulators. The nodes containing yellow green petals were used as materials to execute the study with a variety of MS medium concentrations. The 1/4MS medium showed the best development of adventitious root, while the 1/2MS medium exhibited the potential growth. The higher the concentration of sucrose showed the better development and growth of both shoots and adventitious roots. Many adventitious roots were developed at the controlled culture medium at pH 4.8 with a tendency of suppression with higher levels of pH. Also, the cultivated node and leaf explants with the treatments of simple and combined applications with auxin and cytokinin at the 1/4MS culture medium with adding 5% of sucrose were used to identify the influences of growth regulators. The regeneration of plantlets at the 234single application showed a good result with the addition of BA $1mg{\cdot}L^{-1}$ and the development and growth of adventitious roots appeared to be good at the addition of NAA $1mg{\cdot}L^{-1}$. For the combined applications, the regeneration of plantlets and the development of adventitious roots were prosperous at the combined applications with BA $0.1mg{\cdot}L^{-1}$ and IAA $0.5mg{\cdot}L^{-1}$. The addition of IAA for the leaf explants induced a number of plantlets that showed the potential regeneration, and the highest results was obtained from the combined applications of both BA $1mg{\cdot}L^{-1}$ and IAA $2.5mg{\cdot}L^{-1}$. In addition, the development of adventitious roots showed the satisfactory results at the combined application of both BA $1mg{\cdot}L^{-1}$ and IAA $0.5mg{\cdot}L^{-1}$.

• Applied Chemistry for Engineering
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• v.19 no.5
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• pp.574-581
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• 2008

The optimum regeneration conditions for the regeneration of three way spent catalysts (TWCs), which were taken from automobiles with different driving conditions, were investigated to evaluate the suitability as alternative catalysts for removing VOCs. The spent catalysts were washed with five different acids ($HNO_3$, $H_2SO_4$, $C_2H_2O_4$, $C_6H_8O_7$, and $H_3PO_4$) to remove contaminants and examine the optimum conditions for recovering the catalytic activity. The physicochemical properties of spent and its regenerated TWCs were evaluated by using nitrogen adsorption-desorption isotherms, XRD, and ICP. The relative atomic ratios of contaminants and platinum group metals (PGMs) of the spent TWCs were greatly dependent on the placed positions. The main contaminants formed were lubricant oil additives and metallic components. Also, the regeneration treatment increased the PGMs ratio, BET surface area, and average pore diameter of TWCs. The catalytic activity results indicated that the spent TWCs have the possibility for removing VOCs. Moreover, the employed acid treatments greatly enhanced the catalytic activity of the spent TWCs. Especially, nitric and oxalic acids provided the most improvement in the catalytic behavior. The catalytic activities of the regenerated TWCs were significantly influenced by the containing platinum ratios rather than the removal ratios of contaminants and the changes in the structural properties offered by the acid treatments.

• Journal of Periodontal and Implant Science
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• v.34 no.3
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• pp.543-549
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• 2004

Chitosan has been widely researched as bone substitution materials and membranes in orthopedic/periodontal applications. Chitosan nanofiber membrane was fabricated by chitosan nanofiber using electrospinning technique. The structure of the membrane is nonwoven, three-dimensional, porous, and nanoscale fiber-based matrix. The aim of this study was to evaluate the biocompatibility of chitosan nanofiber membrane and to evaluate its capacity of bone regeneration in rabbit calvarial defect. Ten mm diameter round cranial defects were made and covered by 2 kinds of membranes (Gore-Tex membrane, chitosan nanofiber membrane) in rabbits. Animals were sacrificed at 4 weeks after surgery. Decalcified specimens were prepared and observed by microscope. Chitosan nanofiber membrane maintained its shape and space at 4 weeks. No inflammatory cells were seen on the surface of the membrane. In calvarial defects, new bone bridges were formed at all defect areas and fused to original old bone. No distortion and resorption was observed in the grafted chitosan nanofiber membrane. However bone bridge formation and new bone formation at the center of the defect could not be seen in Gore-Tex membranes. It is concluded that the novel membrane made of chitosan nanofiber by electrospinning technique may be used as a possible tool for guided bone regeneration.

• Applied Chemistry for Engineering
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• v.19 no.3
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• pp.326-331
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• 2008

The purpose of this work is to develope sodium-containing nonstoichiometric apatitic coatings on solid substrate. The apatitic coatings prepared at different concentrations of sodium salt indicated that the presence of sodium ions exerted significant effects on the physicochemical properties of the apatitic coating including surface morphology, chemical state, and Ca/P ratio. The variation of these properties was sustained up to 0.01 mM of sodium ion concentration. The ratio of calcium to phosphorus was varied from 2.18 to 2.03 which indicated the apatitic coating prepared in this study was calcium-rich nonstoichiometric apatite. The structure of all the samples appeared to be low crystalline. In the presence of sodium ion within the apaptitic coating, the adhesion of human osteoblast-like SaOS-2 cells was significantly promoted. On the other hand, the proliferation of the cells on the apatitic coatings was decreased with the increase of sodium ions. This reverse response of SaOS-2 cells indicates that the interaction between SaOS-2 and apatitic surface triggered considerable changes in intracellular mechanisms including cellular signal transductions.

• Journal of Korea Port Economic Association
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• v.38 no.1
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• pp.101-111
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• 2022

As Asia's leading advanced country, Korea has an absolute advantage over foreign trade routes and maritime economies over inland countries. Following the change in social background, the original port area is for various reasons, and some ills are gradually revealing people's private interests. Due to this, it is the economic interest and future development space of the marine industry cluster in the port area that are directly affected and damaged. This study studied the relationship between marine industry clusters and port urban regeneration. It is intended to present the necessity and importance of activating the marine industry cluster through port urban regeneration while analyzing the regenerative design from the quantitative analysis angle. Therefore, first of all, the theoretical backgrounds were considered, and the cases of port cities that did well worldwide were analyzed according to the current status of the northern port of Busan, the research target site, through analysis. In addition, in order to increase the reliability of this study, the data of marine industry clusters and port city regeneration were reviewed using empirical analysis. Looking at the results of this study's case study and empirical analysis, it is a relationship that actually improved and interacted between the marine industry cluster and the port city regeneration. Through the study, it is expected that the Busan North Port Redevelopment Project will be promoted at the design, environmental, and economic level, and at the same time, it will be able to enhance its status as a marine city in Busan. The results show that, no matter which country or port city, the development of economy, society, culture and will inevitably promote the vigorous development of the marine industrial cluster, also, the port area development to a certain degree. will naturally the physical conditions of regional development obstacle through the port city of regeneration. This promotion will overcome.