• Journal of Adhesion and Interface
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• v.21 no.4
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• pp.143-155
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• 2020

Hydrophobic Organic-Inorganic (O-I) hybrid materials prepared by sol-gel process have been widely used at functional coating fields such as coatings for anti-corrosion, anti-icing, self-cleaning, anti-reflection. The key point for fabricating hydrophobic surface is to optimize the surface energy and roughness of the coating films. There are typical processes to control the surface energy and roughness which are 'In situ fabricating', 'Pre-fluorinating/Post-roughening', 'Pre-roughening/ Post-fluorinating'. In this study, particle-binder process was used for in-situ fabrication of hydrophobic coating films. Various O-I hybrid compounds prepared using several kinds of alkoxysilane compounds were used as a binder for silica nanoparticles at particle-binder process. To study effect of fluorine content and weight ratio of particle : binder on the hydrophobicity and surface morphology, Hydrophobic coating films were prepared onto glass substrate at various content of fluorine content of O-I hybrid binder and weight ratio of particle : binder. The coating films prepared using O-I hybrid binder (GPTi-HF10) having 10 wt% of fluorine content showed the highes water contact angle (107.52±1.6°). The coating films prepared at 1:3 weight ratio of GPTi-HF10 : silica nanoparticle exhibited the highest water contact angle (130.84±1.99°).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.6
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• pp.197-206
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• 2021

There is growing interest in the function and role of public research institutes as "entrepreneurial actors" that can contribute to industrial development by commercializing excellent research outputs. On the other hand, their performance in the commercialization phase is insufficient because of the insufficient technological technology readiness level or repeatability. This study conducted probit model analysis to examine the effect of the technology readiness level and commercialization activities on the success of technology commercialization. The results showed that the possibility of success in technology commercialization increased with increasing TRL at the time of acquisition. In addition, the difference between the TRL at the time of acquisition and the current TRL (TRL Gap) does not affect technology commercialization on its own. It generates additional effects in conjunction with the TRL at the time of acquisition. Finally, the results show that technology commercialization is most likely to succeed if technology with a TRL 4-6 level is improved to TRL 9 level through a marginal effect estimation.

• Food Science and Industry
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• v.53 no.1
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• pp.69-83
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• 2020

For the development of the chitosan industry in Korea, the catch of red snow crabs caught on the east coast is rapidly decreasing. Therefore, it is urgent to develop raw materials that can replace the red snow crab as the top priority to solve the supply and demand problems, as well as wastewater treatment costs account for a large proportion of the cost of chitosan. In order to solve the problems, continuous research on biological extraction methods such as enzymatic extraction and microbial fermentation will increase production efficiency and lower unit cost as well as chemical extraction methods. Further efficient manufacturing method can be established. Establishing of novel techniques is indispensable for production of high-purity chitosan and the ability to regulate and separate the molecular weight, as well as joint research with industry, academia and research institute for the research and development of high-functional chitosan derivatives.

• Food Science and Industry
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• v.50 no.2
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• pp.37-51
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• 2017

Food packaging strategies have steadily improved with increasing demand for improved food safety, convenience, and shelf life. The development of edible film has been hailed as a technology substituting packaging using synthetic plastics. There has been a surge for research to develop antimicrobial edible films and coatings that can increase microbiological safety while preserving foods. This review addresses recent results that are useful in advancing and extending research into antimicrobial edible films. In this review, we suggest the trend of the development of antimicrobial edible film/coatings by outlining edible film materials, antimicrobial substances, antimicrobial and physical properties of the films, commercial antimicrobial edible films, and methods to statistically predict the efficacy of antimicrobial edible film/coatings, reported in recent studies.

• Membrane Journal
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• v.31 no.3
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• pp.219-227
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• 2021

Molecularly imprinted membrane (MIM) is a porous polymer membrane incorporating with the molecular recognizing sites. In this study, the supporting P(AN-co-MA) asymmetric membrane was prepared by nonsolvent induced phase separation (NIPS) method. And then, MIM with lysozyme template sites was prepared using the surface imprinting method on the P(AN-co-MA) asymmetric membrane introducing a photoactive iniferter and then photo-grafting. The P(AN-co-MA) asymmetric membrane was modified with 3-chloropropyltrimethoxysilane and dithiocarbamate as a photoactive iniferter. To prepare a lysozyme imprinted membrane, the modified P(AN-co-MA) membrane was copolymerized with acrylamide as a functional momomer, N,N'-methylene bisacrylamide as a crosslinker and lysozyme as a template in the UV irradiation environment. The lysozyme imprinted MIM was analyzed by using SEM, FT-IR and EDS measurements. Its results confirm that all the P(AN-co-MA) membranes have an asymmetric structure and the iniferter group is successfully introduced on the membrane surface. The process parameters were adjusted to obtain MIM having the excellent lysozyme adsorption. The maximum lysozyme adsorption capacity reaches at 2.7 mg/g, which is 13 times higher than that of the non imprinted membrane (NIM). The permselective membrane filtration experiments of ovalbumin to lysozyme show that the P(AN-co-MA) MIM preferentially bounds a greater amount of lysozyme.

• Membrane Journal
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• v.31 no.3
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• pp.228-240
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• 2021

The organic solvent robust polybenzimidazole (PBI) membranes were prepared as organic solvent nanofiltration (OSN) membrane for the recycling of alcoholic solvents using non-solvent induced phase separation with different dope solution concentration and coagulant composition of water/ethanol mixtures to control the membrane morphology and permeation performance. Investigation on crosslinking of polybenzimidazole indicated that the membrane crosslinked with dibromoxylene (DBX) had enough mechanical strength and solvent resistance to be applied as a OSN membranes. The crosslinked PBI membrane prepared by more than 20wt% dope concentration coagulated in water showed a rejection of > 90% to Congo Red (MW of 696.66 g/mol) while pure ethanol permeances was more than 22.5 LMH/bar at 5 bar. Investigation on coagulant composition indicated that ethanol permeance through crosslinked PBI OSN membrane increased with increasing of ethanol concentration in water/ethanol mixture coagulants.

• The Journal of the Korea Contents Association
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• v.21 no.4
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• pp.815-824
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• 2021

Purpose: This study was to identify the degree of academic stress, college life Adjustment, and social support perceived by nursing students, and to identify the mediating effect of social support between academic stress and college life Adjustment. The participants were 248 nursing college students who have experience in field practice at 4 universities in G metropolitan city. Data analysis was analyzed using SPSS 24.0 as Descriptive statistics, Independent-test, One-way ANOVA, Pearson's correction, and Bootstrapping. Results: The study found 2.68 points for academic stress, 4.11 points for social support, and 3.5 points for college life adjustment. Academic stress was negative correlation with social support and Adjustment to college life, social support was positive correlation with Adjustment to college life. As a result of the analysis by applying the mediating effect verification model 4, first, academic stress had a significant negative effect on social support, second, academic stress had a negative effect on college life adjustment, and social support had a positive effect on college life adjustment. Third, the analysis of the total, direct, and indirect effects of academic stress and social support on college life adjustment showed that they were all significant. In conclusion, it has been found that social support has a partially controlled mediating effect between academic stress and college life adjustment.

• The Journal of the Convergence on Culture Technology
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• v.7 no.3
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• pp.7-17
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• 2021

The purpose of this study was to investigate the effect of marriage consciousness, occupational consciousness, and gender equality consciousness on childbirth will in nursing students and to provide the basic data of to control childbirth will. Data were collected from 242 nursing students in B city and analyzed by t-test, ANOVA, Pearson correlation coefficient, and multiple regression using SPSS/WIN 21.0. The average of marriage consciousness was 3.43±.36, the average of occupational consciousness was 3.30±.47, the average of gender equality consciousness was 3.85±.37, the average of childbirth will consciousness was 3.48±.42. The childbirth will according to the general characteristics was not significantly different. The study subject's childbirth will was correlated with occupational consciousness(r=.279, p<.001), occupational consciousness(r=.143, p=.026), gender equality consciousness(r=.263, p<.001), and marriage conscious was correlated occupational consciousness(r=.279, p<.001). The factors influencing childbirth will of the study subjects were marriage consciousness(𝛽=.215,p=.001), gender equality consciousness(𝛽=.239, p<.001), and the explanatory power of these variables was 11.9%. According to this study, it is necessary to confirm the effects of developing an intervention program and applying this program to improve the decisions of nursing students concerning marriage and having children.

• Journal of Practical Agriculture & Fisheries Research
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• v.23 no.1
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• pp.13-26
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• 2021

This study was conducted to identify various types of activities of payment contract for ecosystem services. As supporting services, 12 types of activities were derived: fallow, eco-friendly crop cultivation, shelter creation management, etc. As regulating services, 5 types of activities were derived: stream environment purification, creation and management of riparian vegetation, creation and management of forests for responding to climate change, etc. As cultural services, five types of activities were derived: creation and management of landscape forests, creation and management of ecological trails, managing ecosystem conservation, etc.

• Land and Housing Review
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• v.13 no.3
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• pp.93-106
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• 2022

Ventilation plays an important role in controlling indoor air quality. Due to the recent spread of infectious diseases such as COVID-19 and with people spending more time indoors, there's been increased attention on the importance of ventilation performance. In many countries, ventilation is regulated by airflow rates and the number of air changes per hour (ACH). However, airflow rates and ACH alone do not provide an accurate account of actual indoor pollutant removal and ventilation uniformity in a space. This study looked into the ventilation performance of an actual residential unit using several sampling points instead of basing it off of airflow and air change rates. Literature review was used to derive relevant influencing factors and the tracer gas dilution method was used for the field test. The study measured air velocity, age of air, and ventilation efficiency at several locations and compared them to the average value at the center of the test space to determine the differences in ventilation performance at the selected measurement points. The study showed that different sampling locations resulted in different ventilation values. Findings of this study will be used to develop an experimental procedure for evaluating indoor ventilation performance of actual residential spaces.