• Applied Chemistry for Engineering
• /
• v.30 no.5
• /
• pp.633-638
• /
• 2019

Indoor air quality underground facilities are not equipped for the removal of volatile organic compounds (VOCs) and they are usually treated by diffusion methods such as ventilation. In this study, an adsorption filter was prepared using various coating methods such as carbon nano fiber (CNF) and dip coating. As a result, the adsorption performance was improved by 2 to 20 times or more compared to that of using the metal foam support. This is maybe due to the enhancement of pore distribution which was confirmed by SEM. In addition, the adsorption performance was 13.95 mg/g by adding lignin, and also an average adsorption performance of 13.25 mg/g was maintained after washing indicating that a highly durable adsorption filter material was prepared. It can be suggested that the developed adsorption filter material can be a potential solution that can fundamentally control VOCs, not via the concentration reduction of mechanical ventilation in underground facilities.

• Journal of the Korean Electrochemical Society
• /
• v.22 no.3
• /
• pp.122-127
• /
• 2019

In this study, we investigate the electrochemical performance of lithium terephthalate (LTA) battery using graphite coated metal current collector to overcome the disadvantages of organic batteries which is high interfacial resistance between current collector and electrode. The LTA anode material is synthesized by acid-based ion exchange reaction without impurities. The contact properties between stick-type LTA-based electrode and graphite coated current collector are estimated by the cross-section SEM and EIS. The graphite coated current collector significantly reduced the interfacial resistance of the LTA battery. The second discharge capacities of bare current collector LTA and graphite coated current collector LTA batteries are 107.6 mAh/g and 148.8 mAh/g at 0.1C, respectively. The graphite coated current collector LTA batteries show higher cycle life, higher discharge capacity, and higher rate-capability than bare LTA batteries.

• Food Science and Industry
• /
• v.52 no.4
• /
• pp.375-386
• /
• 2019

Carbohydrates play an important role in not only providing the body with calories but also giving taste and texture in foods. Recently, there is a growing interest in low-calorie carbohydrate materials due to obesity and the resulting diseases caused by excessive intake of calories. Polydextrose and sugar alcohols have calories of 2.0 kcal/g and 2.4 kcal/g, respectively. In addition to being a low-calorie material, polydextrose can be widely used as a dietary fiber source, thereby reducing calories and supplementing fiber. Sugar alcohols have sweetness comparable to a table sugar but they are not calculated as a sugar, so it can meet the government's sugar reduction policy. Also, polydextrose and sugar alcohols are not easily decomposed by heat and acid, and thus can be used without being affected by food manufacturing processes.

• Microbiology and Biotechnology Letters
• /
• v.47 no.1
• /
• pp.78-86
• /
• 2019

Recombinant Corynebacterium glutamicum producing N-acetylglucosamine (GlcNAc) was constructed by metabolic engineering. To construct a basal strain producing GlcNAc, the genes nagA, nagB, and nanE encoding N-acetylglucosamine-6-phosphate deacetylase, glucosamine-6-phosphate deaminase, and N-acetylmannosamine-6-phosphate epimerase, respectively, were sequentially deleted from C. glutamicum ATCC 13032, yielding strain KG208. In addition, the genes glmS and gna1 encoding glucosamine-6-phosphate synthase and glucosamine-6-phosphate N-acetyltransferase, which originated from C. glutamicum and Saccharomyces cerevisiae, respectively, were expressed in several expression vectors. Among several combinations of glmS and gna1 expression, recombinant cells expressing glmS and gna1 under control of the ilvC promoter produced 1.77 g/l of GlcNAc and 0.63 g/l of glucosamine in flask cultures.

• Journal of Life Science
• /
• v.29 no.1
• /
• pp.52-59
• /
• 2019

The leave of Polygonum tinctorium (LPT) have been used for centuries as a traditional medicine and as a food ingredient and natural dye. The aim of the current study was to develop high-value added products using LPT. Hot water extract (HWE) and ethanol extract (EE) of LPT were prepared, respectively, and their bioactivity was evaluated. The extraction ratio for the HWE was 27.6%, which was two-fold higher than that of the EE. The contents of total polyphenol in the HWE and total sugar in the EE were 51.2 mg/g and 297.8 mg/g, respectively. The total flavonoid and reducing sugar contents were similar in the extracts, irrespective of the extraction solvent. The HWE did not show antimicrobial activity in a disc-diffusion assay, but the EE showed strong growth inhibition against gram-positive bacteria. The EE exhibited stronger DPPH and ABTS radical scavenging activities and reducing power than those of the HWE. The HWE was particularly effective as a scavenger of nitrite ($RC_{50}$ of $6.0{\mu}g/ml$). In an antithrombosis activity assay, the EE showed significant anticoagulation activity as determined by an extended blood coagulation time (thrombin time, prothrombin time, and activated partial thromboplastin time), in addition to platelet aggregation activity. The HWE also showed platelet aggregation inhibitory activity. This report provides the first evidence of antithrombosis activities of LPT. Our results suggest that LPT has potential as a new antioxidant and antithrombosis agent.

• Korean Journal of Forensic Psychology
• /
• v.11 no.1
• /
• pp.37-61
• /
• 2020

Lee, Khogali, Despodova, and Penrod (2019) demonstrated that American participants whose races are different from a defendant and a victim rendered more punitive judgments against the defendant in a same-race crime (e.g., White observer-Black defendant-Black victim) compared to a cross-race crime (e.g., White observer-Black defendant-Hispanic victim). The aim of the current study was to test the replicability of their findings in a different country-South Korea. Study 1a failed to replicate the race-combination effect in South Korea with three new moderators-case strength, defendant's use of violence, and race salience. Study 1b was conducted with the same design of Study 1a in the United States to examine whether the failure of the replication in Study 1a was due to cultural differences between South Korea and the United States. However, Study 1b also failed to replicate the race-combination effect. Study 2 conducted a meta-analytic review of the data from Lee et al.'s (2019) study, along with the data from Study 1a and 1b and revealed that the race-salience manipulation in Study 1a and 1b might have caused the null results. We conclude that when people' races are different from both a defendant and a victim, they are likely to render more punitive judgments against the defendant in a same-race crime than a cross-race crime. However, the race-combination effect is only sustained when race-relevant issues are not salient in the crime.

• Journal of Korea Entertainment Industry Association
• /
• v.13 no.8
• /
• pp.345-356
• /
• 2019

This study investigated the influence of media sports contact motivation on direct sports participation in order to induce direct sports participation through media sports. In this regard, this study aimed to provide the basic data of media sports and sports participation by studying the effects of consumer's exercise commitment and exercise duration. From April 1, 2019 to April 31, 2019, a survey was conducted on 300 males and females in G and J provinces. To determine the purpose of the study, IBM's SPSS Ver. 21.0 and AMOS Ver. The analysis was performed using a statistical program of 21.0. The results of the study are as follows. First, media sport contact motivation was found to have an effect on exercise commitment. In addition, media sports contact motivation was found to have an effect on exercise persistence and sports participation. In addition, exercise commitment was found to have an effect on exercise duration, and exercise duration was found to affect sports participation. Second, in terms of media sports contact motivation and sports participation, exercise persistence had a mediating effect. In addition, it was found that exercise commitment had a mediating effect on the relationship between media sports contact motivation and exercise persistence, and exercise persistence had a mediating effect on the relationship between exercise commitment and sports participation. Third, media sports contact motivation did not have a direct effect on sports participation. Also, exercise immersion has no mediating effect in the relationship between media sports contact motivation and sports participation. However, in terms of media sports contact motivation and sports participation, exercise commitment and exercise persistence showed a double mediating effect.

• Fisheries and Aquatic Sciences
• /
• v.22 no.7
• /
• pp.16.1-16.14
• /
• 2019

Two dietary experiments were performed to evaluate the impact of the herb Mentha piperita as a dietary supplement on Catla catla. In Experiment 1, fingerlings (0.45-2.60 g) were fed on diets supplemented with M. piperita at different levels (P1, P2, P3, and P4 at 2, 4, 6, and $8g\;Kg^{-1}$ of feed) and C1 served as the control with no peppermint supplementation. In Experiment 2, fingerlings (0.40-3.15 g) were fed with diets containing autochthonous probiotic bacteria Bacillus coagulans (3000 colony forming unit $g^{-1}$) along with M. piperita (PP1-PP4 at 2, 4, 6, and $8g\;Kg^{-1}$ of feed) and feed C2 served as control containing probiotics but no peppermint. Significantly (P < 0.05) high values of growth parameters, digestive enzyme activities, low reed conservation ratio, low excretion of ammonia, and orthophosphates were observed in fingerlings fed with P3 for Experiment 1 and PP3 for Experiment 2. Hematological counts, phagocytic activity, and respiratory burst activity were also enhanced in fingerlings fed with M. piperita supplementation revealing that dietary administration of peppermint at optimum level can enhance the growth, digestibility, and immunity of C. catla fingerlings; however, incorporation of B. coagulans showed better growth and immunity revealing that synergistic effects of M. piperita and autochthonous probiotic in C. catla diets can lead to its sustainable aquaculture.

• Korean Journal of Ecology and Environment
• /
• v.52 no.2
• /
• pp.118-125
• /
• 2019

Swimming performance of fish is an important factor in the survival of fish. Also, swimming performance of fish is used in the form of habitat, or as a condition to consider when creating a fish ladder. However in Korea, researches in swimming performance of Korean freshwater fish were scarce and inadequate in some part, thus fish ladders were installed without considering their swimming performance. Therefore, in this study, we measured swimming performance of 4 Korean freshwater fish species to consider importance of swimming performance test. The fish used in this study were Carassius auratus, Zacco koreanus, Gnathopogon strigatus, Acheilognathus lanceolata intermedia species which was collected during October to November, 2018 at Geum River, and measurement for swimming speed of each fish was done by using $Loligo^{(R)}$ System, swim tunnel respirometer in January to February of 2019. The average value of the burst critical swimming speed ($U_{crit}$) for each species was $0.8{\pm}0.04m\;s^{-1}$ for C. auratus, $0.77{\pm}0.04m\;s^{-1}$ for Z. koreanus, $0.95{\pm}0.04m\;s^{-1}$ for G. strigatus, $0.73{\pm}0.03m\;s^{-1}$ for A. lanceolata intermedia and the average value of prolonged critical swimming speed was $0.54m\;s^{-1}$ for C. auratus, $0.67m\;s^{-1}$ for Z. koreanus, $0.7m\;s^{-1}$ for G. strigatus, $0.54m\;s^{-1}$ for A. lanceolata intermedia. Since the fish used in this experiment were collected from a small part of the water system in Korea and there were only 4 species, they were not enough to represent the species that inhabit the entire Korean water system. It will be necessary to continue evaluating the swimming performance of other freshwater species in Korea.

• Journal of Digital Convergence
• /
• v.17 no.12
• /
• pp.375-382
• /
• 2019

The purpose of this study was to examine perception, attitude, performance on the hand washing by dental hygienist. A self-reported questionnaire was surveyed by 165 dental hygienist in G area. The data were analyzed for frequency analysis, average, standard deviation, independent t-test, one-way ANOVA, pearson's correlation coefficient by using SPSS 21.0 program. The perception on the hand washing, age and work place, career, Number of hand washing, Frequency of hand washing education were higher significantly. The attitude, performance on the hand washing by dental hygienist, age, career, work place were higher significantly. There were positive correlations among the perception, attitude, performance of dental hygienists on the hand washing by dental hygienist. The result of this study indicates a necessity for developing education programs consistently to improve perception, attitude, performance of hand washing by dental hygienist.