• Journal of the Korea Organic Resources Recycling Association
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• v.9 no.1
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• pp.90-98
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• 2001

The slow degradation rate of sewage sludge in anaerobic digesters is due to the rate limiting step of sludge hydrolysis. Therefore, the pre-treatment process had been carried out using acidic(pH 1.5, 3, 4, 5) and alkaline(pH9, 10, 13), thermal(50, 100, 150, $200^{\circ}C$) and ultrasonic treatment(400W, 20kHz, 15, 20, 25, 30, 35, 40, 50, 60min). In the best conditions of each treatment, the SCOD ratio(%) of treated/untreared samples were increased 102% in acid(pH5), 986% in alkali(pH13), 959% in thermal($200^{\circ}C$) and 1123% in ultrasonic(35min) treatment. As the result, the ultrasonic treatment was most effective, followed by alkali, thermal, acidic treatment. In the effects of total gas productivity, the thermal($200^{\circ}C$) pretreatment was the highest, followed by thermal($150^{\circ}C$), ultrasonic(90min), alkaline(pH9) and ultrasonic(50min).

• Journal of the Korean Society of Food Science and Nutrition
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• v.24 no.5
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• pp.796-802
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• 1995

Oyijangachi, a traditional Korean brinded cucumber, was prepared by brinning the cucumbers in five different solutions for 48 hrs and then, was dipped into dipping sources(Kochujang, Doenjang and Ganjang) for 30 days of aging. Firmness, calcium content and enzyme activities(pectinesterase and polygalacturonase) changes were measured among the cucumbers which were treated by five different solutions during aging. The firmness of Kochujang Oyijangachi were the lowest after 10 days of aging for all from the five brining solutions because of "hollow phenomena" of cucumbers. Calcium contents of cucumbers after dipping into the five solutiosn increased as calcium content of the solutions increased and also increased when the cucumbers dipped into the dipping bases(Kochujang, Doenjang and Ganjang) because of calcium migration from the dipping sources into the cucumbers during aging. The calcium contents of the three dipping bases were ranged from 70mg% to 120mg% of Ca. The activity of polygalacturonase in the Oyijangachi decreased generally during aging and decreased rapidly during initial 5 days of aging. The activity of pectinesterase of cucumbers treated with 12% salts solutions(treatment 3, 4 and 5) were higher than those of cucumbers treated with 6% salts solutions(treatment 1 and 2).

• International Journal of Naval Architecture and Ocean Engineering
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• v.10 no.6
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• pp.794-802
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• 2018

The ice resistance series charts for icebreaking ships were developed through a series of systematic model tests in the ice tank of the Korean Research Institute of Ship and Ocean Engineering (KRISO). Spencer's (1992) component-based scaling system for ship-ice model tests was applied to extend the model ship correlations. Beam to draft ratio (B/T), length to beam ratio (L/B), block coefficient ($C_B$) and stem angle (${\alpha}$) were selected as geometric parameters for hull form development. The basic hull form (S1) of twin pod type with B/T of 3.0, L/B of 6.0, $C_B$ of 0.75 and stem angle of $25^{\circ}$ was generated with a modern hull design concept. A total of 13 hulls were designed varying the geometric parameters; B/T of 2.5 and 3.5, L/B of 5.0 and 7.0, $C_B$ from 0.65 to 0.85 in intervals of 0.05, and 5 stem angles from $15^{\circ}$ to $35^{\circ}$. Ice resistance tests were first carried out with the basic hull form in level ice with suitable speed. Four more tests for $C_B$ variations from 0.65 to 0.85 were conducted and two more for beam to draft and length to beam ratios were also performed to study the effect of the geometric parameters on ice resistance. Ice resistance tests were summarized using the volumetric coefficient, $C_V$ ($={\nabla}/L^3$), instead of L/B and $C_B$ variations. Additional model tests were also carried out to account for the effect of the stem angle, ice thickness and ice strength on ice resistance. In order to develop the ice resistance series charts with a minimum number of experiments, the trends of the ice resistance obtained from the experiments were assumed to be similar for other model ship with different geometric parameters. A total of 18 sheets composed of combinations of three different beam to draft ratios and six block coefficients were developed as a parameter of $C_V$ in the low speed regions. Three correction charts were also developed for stem angles, ice thickness and ice strength respectively. The charts were applied to estimate ice resistance for existing icebreaking ships including ARAON, and the results were satisfactory with reasonable accuracy.

• Food Science and Preservation
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• v.24 no.6
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• pp.802-812
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• 2017

This study was conducted to investigate the quality properties depending on the cultivation methods (general, organic, pesticide-free) of yuza and its various parts (peel, pulp, seed). The contents of hesperidin were the highest in yuza feel grown by pesticide-free method (13.23 mg/g). The contents of naringin presented a higher content in the peel, especially which of the general (4.62 mg/g) showed the highest value. Vitamin C analysis showed the highest content in the peel, significantly varied according to the cultivation method and various parts (p<0.05). Vitamin C value was significantly highest in organic peel, which was 770.02 mg/100 g, whereas among the peel, the pulp and the seed were it the lowest in the seed. The content of total polyphenols were the highest in general peel (0.85 mg/g). Flavonoid content of pesticide-free seed was significantly higher than those of the other yuja samples which was 0.89 mg/g (p<0.05). The DPPH radical scavenging activity was relatively more active in the peel among the above-mentioned three parts, especially the pesticide-free peel was most active, which was 73.94%. The ABTS radical scavenging activity of organic peel was significantly active among the samples, which was 84.47% (p<0.05). Based on these results, it can be said that yuja has variety of useful components in the pulp and the seed as well as the peel: and thus it's hight recommended to develop more varied yuja products.

• Journal of the Korean Society for information Management
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• v.39 no.1
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• pp.331-350
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• 2022

This study aims to understand topics of incivility related to COVID-19 from analyzing Twitter posts including COVID-19-related hate speech. To achieve the goal, a total of 63,802 tweets that were created between December 1st, 2019, and August 31st, 2021, covering three targets of hate speech including region and public facilities, groups of people, and religion were analyzed. Frequency analysis, dynamic topic modeling, and keyword co-occurrence network analysis were used to explore topics and keywords. 1) Results of frequency analysis revealed that hate against regions and public facilities showed a relatively increasing trend while hate against specific groups of people and religion showed a relatively decreasing trend. 2) Results of dynamic topic modeling analysis showed keywords of each of the three targets of hate speech. Keywords of the region and public facilities included "Daegu, Gyeongbuk local hate", "interregional hate", and "public facility hate"; groups of people included "China hate", "virus spreaders", and "outdoor activity sanctions"; and religion included "Shincheonji", "Christianity", "religious infection", "refusal of quarantine", and "places visited by confirmed cases". 3) Similarly, results of keyword co-occurrence network analysis revealed keywords of three targets: region and public facilities (Corona, Daegu, confirmed cases, Shincheonji, Gyeongbuk, region); specific groups of people (Coronavirus, Wuhan pneumonia, Wuhan, China, Chinese, People, Entry, Banned); and religion (Corona, Church, Daegu, confirmed cases, infection). This study attempted to grasp the public's anti-citizenship public opinion related to COVID-19 by identifying domestic COVID-19 hate targets and keywords using social media. In particular, it is meaningful to grasp public opinion on incivility topics and hate emotions expressed on social media using data mining techniques for hate-related to COVID-19, which has not been attempted in previous studies. In addition, the results of this study suggest practical implications in that they can be based on basic data for contributing to the establishment of systems and policies for cultural communication measures in preparation for the post-COVID-19 era.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.12 no.4
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• pp.287-304
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• 2007

This study was carried out to investigate spatio-temporal variations of benthic environment and macrobenthic polychaete communities in Gamak Bay where excessive organic matters from untreated sewage effluents and fish and shellfish farming activities have been accumulated in certain regions. Such environmental variables as sediment composition, organic content, acid volatile sulfide and dissolved oxygen content etc. were measured and polychaete specimens were taken in September 1999 and February 2000. In September 1999, organic contents were up to three times higher in the northwestern part of the bay and the area closed to Gukdong harbor than in the rest of the bay. In particular, benthic environment of the northwestern part of the bay was extremely deteriorated by the occurrence of hypoxia and highly concentrated sulfide. Of 28 stations investigated in summer, 5 stations located in the northwestern part were azoic. In the rest of the stations, a total of 119 polychaete species were sampled with a mean density of 900 $ind./m^2$. While species richness was higher in the entrance and central part of the bay where water exchanges with open sea were relatively active, density was higher in the moderately enriched stations neighbouring Gukdong harbor and fish farms where such potential indicators of organic pollution as Aphelochaeta monilaris, Lumbrineris longifolia were largely dominant. In February 2000, a total of 81 polychaete species appeared with a mean density of 2,802 $ind./m^2$ from 12 stations sampled in winter. Azoic areas were recolonized by Capitella capitata, Pseudopolydora paucibranchiata and Dipolydora socialis which showed maximum density in the innermost station. On the other hand, the rest of the stations were dominated by Euchone alicaudata and Praxillella affinis. The configuration of the stations sampled in summer and winter on the multidimensional scaling plots reflected the position of each stations within the bay in which there were great differences in organic content, sulfide concentration and oxygen content rather than in sediment composition. Therefore, heterogeneities in polychaete community structure in Gamak Bay were primarily influenced by the degree of the disturbance depending on the position within the bay.

• Asian-Australasian Journal of Animal Sciences
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• v.33 no.5
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• pp.802-811
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• 2020

Objective: Two experiments were conducted to investigate the effects of dietary sucralose on diet preference and growth performance of weaned piglets, and a third experiment was a 28-d safety study to examine if high-dose sucralose could affect the health state of weaned piglets. Methods: In experiment one, 48 piglets had free access to a corn-soybean based diet and the same diet supplemented with 150 mg/kg sucralose for 15 d. In experiment two, 180 piglets were blocked into 5 treatments with 6 replications. They were fed basal diets supplemented with 0, 75, 150, 225, and 300 mg/kg sucralose for 28 days. In experiment three, 108 piglets were randomly assigned to 3 treatments and fed diets supplemented with 0, 150 (suitable level), and 1,500 (ten-fold suitable level) mg/kg sucralose for 28 d. Results: The experiment 1 showed that piglets preferred (p<0.05) diets containing sucralose during experimental period. In experiment 2, piglets fed a diet supplemented with 150 mg/kg sucralose had a higher average daily gain (ADG) and average daily feed intake (ADFI) than pigs in the control group and other treatment groups during the experiment period. The concentrations of sucralose over 150 mg/kg may decrease feed intake. However, no difference in feed conversion ratio was observed. In experiment 3, piglets fed diet supplemented with 150 mg/kg sucralose had a higher ADG and ADFI than that of pigs in the control group and 1,500 mg/kg treatment groups during the experiment period. Clinical blood metabolites, organ index and histological morphology were not significantly different between sucralose treatments. Conclusion: Sucralose can promote feed intake and thereby improve growth performance of weaned piglets. Moreover, inclusion of 1,500 mg/kg sucralose was demonstrated to have no observed adverse effects. Supplementing 150 mg/kg sucralose for weaned piglets is recommended in this study.

• Journal of the Korean Society of Food Science and Nutrition
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• v.37 no.12
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• pp.1627-1631
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• 2008

This study was to analyze the physiology activity of barley leaf extract using different drying methods. Yield of RL (raw leaf) and barley leaves dried did not show significant difference by various drying methods. There was no significant difference in total phenolic content by dry method. However, total flavonoid content was high in HD (dried after heat treatments) barley leaf after RL. There was no significance in barley leaf dried by SD (dried in the shade), FD (vacuum freeze dried) and MW (dried by microwave) after the microwave. Superoxide dismutase-like activity was high over 90%: $95.6{\pm}0.3%$ in RL, $94.9{\pm}0.7%$ in HD barley leaf, $92.0{\pm}1.3%$ in SD barley leaf, $91.5{\pm}0.4%$ in FD barley leaf, and $92.5{\pm}0.2%$ in MW barley leaf using the microwave. Significantly higher antioxidant activity was shown as compared to the control group of sesamol ($88.426{\pm}0.802%$), tocopherol ($88.8{\pm}0.6%$), and BHT ($86.6{\pm}0.8%$). Also, except for RL and MW barley leaf, all showed over 80% peroxyl radical scavenging activity and over 90% inhibition rate of xanthine oxidase. The results of this study show that total phenolic content and total flavonoid content by dry method were dependent on the drying temperature with no impact on antioxidant activity.

• Journal of Korean Clinical Health Science
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• v.5 no.1
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• pp.790-802
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• 2017

Purpose. This study was designed to analyze recent trends in Children Art Therapy Program Intervention research in Korea and suggest future research directions in this area. Methods. Studies(29) selected from http://www.riss4u.net for last 15 year were used. They were analyzed by publication type, field and design of the study, study participants and outcome variables used in intervention studies. Results. 1. As for academic field, there are 15 art therapy academic journals(51.72%), which made up the largest proportion. 2. As for subjects of the study, there are 17 articles of Elementary (58.6%) education, which made up the largest proportion. As for the subjects of sex, 8 articles (27.59%) are for male students, 7 (24.14%) articles are for female students and 14 articles (48.28.%) are for both male and female students. 3. As for 7 articles of Art therapy(24.14%), 7 articles of Group Art therapy (24.14%) made up the largest proporton 4. As for the intervention study method according to the subjects of suicide intervention program, there are 15 articles of monoclonal Pre and post design (51.72%),which made up the largest proportion. 5. As for the sample size, there were 16.79 persons in the treatment group on average, 13.28 persons in the control group have average and the total persons were 10 on average. The treatment period was 12 weeks on average and the average number of treatment times was 18. The places of treatment were 3 schools (10.38%), which made up the largest proportion. 19. The results of the experimental study support the research hypothesis of all 29 programs. Conclusions. As the above, the studies on the art therapy intervention program for children are increasing but the subjects are overly weighted toward elementary school students. Although the content of the art therapy intervention program was varied, it was found that the development of the program using various art media which can induce the motivation of the child was lacking. In addition, the place of experimental mediation was concentrated on psychology center as 12(41.38%), indicating that there are not enough places to connect with community organizations such as schools and hospitals. The variables of experimental study were focused on psychological variables and it was found that there were insufficient application of various variables including coping method, social support, and physiological variables.

• Child Health Nursing Research
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• v.6 no.2
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• pp.199-211
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• 2000

Today, more chronically ill and handicapped children are being cared for at home by a family member caregiver. The task of caring for a family member may feel burden that the caregiver has less time and money and more work. Family functioning and their burden have influence on coping and adaptation of families with chronically-ill children. This study attempted to identify the levels of burden and family functioning in families of children with cerebral palsy and to examine their relationships. The instruments were burden scale developed by Suh and Oh(1993), and a modified Feetham Family Functioning Survey based on Roberts and Feetham.(1982). The subjects were 98 parents of children, under 15 years, who have cerebral palsy and being treated and living in Pusan. Data were collected through a self-administered question- aire from April 26 to May 29. The collected data were tested using frequencies, percentiles, means, t-test, ANOVA, and Pearson correlation coefficient with SPSSWIN program. The results of this study were as follows ; 1. The mean rating scores of burden and family functioning were 2.79±.51 and 4.12±.69, respectively. 2. The relationships between general character- istics and burden were statistically significant difference : degree of children's handicap(F=6.333, P<.01). The relationships between general characteristics and family functioning were statistically significant differences : familial relation with the children(F=3.628, P<.05), caregiver's health status(F=4.359, P<.05), age of children (F=4.185, P<.05), and duration of treatment (F=6.802, P<.01). 3. In families of children with cerebral palsy, there was significantly negative correlation between the burden of parents and the performance of family functioning(r=-.230, P<.05). There were significantly negative correlations between the burden of parents and the satisfaction of family functioning (r=-.211, P<.05), and between the perceived importance and the satisfaction of family functioning(r=-.481, P<.01); however, there was a positive correlation between the performance and the perceived importance of family functioning(r=.425, P<.01). In conclusion, this study suggests that families of children with cerebral palsy need family-focused nursing interventions as supportive care for relieving their burden and for improving family functioning.