• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.1
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• pp.37-43
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• 2020

This study was conducted to evaluate the effects of different nitrogen levels on the yield and nutrient quality of a newly developed domestic hybrid of Teosinte, Geukdong 6〔Zea mays L. subsp. mexicana (Schrad.) H. H. Iltis〕. The field experiment was conducted in a randomized block design with three replicates and consisted of four nitrogen (N) application rates, T1 (200 kg/ha), T2 (300 kg/ha), T3 (400 kg/ha), and T4 (500 kg/ha). No differences were found in plant length, leaf length, leaf width, leaf number, dead leaves, stem hardness, tiller number, and fresh yield (p>0.05). The T3 showed significantly greater dry matter yield at harvest (heading stage) compared to the other treatments (p<0.05). The crude protein content of T4 (10.49%) was higher than those of T1 and T2 (p<0.05). However, there was no significant difference between T4 (10.49%) and T3 (9.63%). The effects on crude fat, crude ash, neutral detergent fiber (NDF), acid detergent fiber (ADF), and crude fiber were not significant (p>0.05). The sugar content was higher in the T2 treatment than the other treatments (p<0.05). For Ca, T3 showed significantly greater content (p<0.05). However, no significant effects were found in the contents of Cu, Fe, K, Mg, Mn, Mo, and Zn (p>0.05). Na content was higher in order of T2 > T4 > T3 > T1 (p<0.05). Total mineral contents were not significantly different among the treatments (p>0.05). Given these results, we recommend the amount of nitrogen fertilization necessary for "Geukdong 6" to be around 400 kg per ha (T3), when considering, high fresh yield, dry matter yield, number of leaves and content of crude protein.

• Journal of The Korean Society of Grassland and Forage Science
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• v.36 no.2
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• pp.150-158
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• 2016

This study was conducted to evaluate growth characteristics, yield and feed value of newly developed domestic teosinte (Geukdong 6) compared to widely cultivated silage corn hybrid (31N27) and sorghum ${\times}$ sudangrass hybrid (P877F). Geukdong 6, a new single cross (Teosinte ${\times}$ Suwon 19) variety, is a teosinte (Zea may L. ssp. maxicana) developed by the Geukdong 6 of agricultural company corporation (GACC) in An-dong province. This field experiment was designed in a randomized block design with three replications and consisted of silage corn (T1), sorghum x sudangrass hybrid (T2) and Geukdong 6 (T3). Leaf length, number of leaves, number of tillers and fresh yield of T3 were higher than that of T1 and T2 (p<0.05). Dry matter yield of T3 was lower than that of T1 (p<0.05). In particular, T3 ($0.1kg/cm^2$) showed to be very tender compared to other T1 ($0.5kg/cm^2$) and T2 ($0.5kg/cm^2$), (p<0.05). The crude protein content of T3 as 8.25% was higher than that of T2 (5.90%), (p<0.05). However, there was no significant differences between T1 (8.14%). The brix degree of T2 was higher than that of T1 and T3 (p<0.05). T3 showed higher content of total minerals compared to T1 and T2 (p<0.05). The relative palatability of T3 was higher than T1 and T2 (p<0.05), when fed to deer as soiling crop. However, it showed a lower than T1 in Korean native cattle and korean native goats. The relative palatability of the silage shown in order of T1> T3> T2 in korean native cattle, spotted deer, and korean native goats. As mentioned above the results, Geukdong 6 (T3) could be recommended as using of soiling and lab silage, when high fresh yield, tender stem, number of many leaf, content of high crude protein, and palatability higher than sorghum ${\times}$ sudangrass hybrid were considered.

• Journal of The Korean Society of Grassland and Forage Science
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• v.42 no.3
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• pp.162-168
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• 2022

This study was carried out to investigate the effects of planting densities on the growth characteristics, dry matter yield, and feed value of "Geukdong 6" (a new variety of corn for feed). The experimental design was arranged in a randomized block design with three replications. Treatments consisted of six planting densities, 60 cm × 25 cm (T1), 60 cm × 30 cm (T2), 70 cm × 25 cm (T3), 70 cm × 30 cm (T4), 80 cm × 25 cm (T5) and 80 cm × 30 cm (T6). All treatments were sown on May 14, 2021, and the harvest was on October 3 (late flowering). Plant length and the number of tillers were the highest in T5 (p<0.05), but the number of leaves and stem diameter were the highest in T6 than in the other treatments (p<0.05). Leaf length, leaf width, and dead leaf were not significantly different among the treatments. Organic matter was highest in T6, and crude protein was highest in T5 (p<0.05). The ether extract was not significantly different among the treatments. Crude fiber, NDF, and ADF were highest in T2 with relatively higher planting density (p<0.05). Calcium and phosphorus were not significantly different among the treatments. TDN content was the highest in T3 (p<0.05). Sugar degree (Brix), fructose, glucose, dextran, isomerose, and inverted sugar were not significantly different among the treatment. Fresh yield, dry matter yield and TDN yield were higher in order of T6 > T5 > T4 > T3 > T2 > T1 (p<0.05). Relatively feed value was higher in order of T3 > T6 > T5 > T1 > T4 > T2 (p<0.05). Based on the above results, planting density could be recommended from 80 cm × 30 cm for efficient production of "Geukdong 6".

• The Journal of Korean Physical Therapy
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• v.15 no.1
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• pp.185-195
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• 2003

This study was performed to investigate the effects on the general features of low back pain. The study subjects were low back pain patients treated with physical therapy at general hospitals located in Gyeonggi-do from August 2, 2000 to September 10. Total number of distributed questionnaires were 300, and 281 questionnaires were collected and analysed finally. The results were follows: 1. 76.3$\%$ of male answers that participate in sports, 60.6$\%$ of female answers that participate in sports and there are significant differences of two group(p < 0.01). 2. In case of male, preferential sports were running, tennis, golf, the others, but in case of female, preferential sports were walking, ascent of a mountain, swimming(p < 0.01). 3. In case of male, the most frequency preferred to participate in sports by patients was 30minutes daily, but in case of female, 3 times a week(p < 0.05). 4. The onset time of low back pain was 28.3$\%$ in the morning, 23.7$\%$ in the afternoon, 23.2$\%$ in motion according. 5. The onset conditions of low back pain was 48.5% during exercise, 44.4$\%$ after exercise. 6. Regardless of gender, low back pain patients want to go to a hospital for treatment. Otherwise, male preferred conventional treatment than a hospital, but female preferred a hospital than conventional treatment(p < 0.05). 7. Regardless of gender, 97.5$\%$ of patients is answered that the most preferential treatment method was physical therapy, 8. 92.2$\%$ of patients is answered that physical therapy was effective.

• Journal of The Korean Society of Grassland and Forage Science
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• v.39 no.1
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• pp.9-16
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• 2019

This study was carried out to investigate the effects of seeding dates and cultivated period on the growth characteristics, dry matter yield and feed value of Teosinte new variety "Geukdong 6"[Zea mays L. subsp. mexicana (Schrad.) H. H. Iltis]for feed. The experimental design was arranged in a randomized block design with three replications. Treatments consisted of five time seeding dates, 10 May(T1), 25 May(T2), 10 June(T3), 25 June(T4) and 10 July(T5), and same time harvesting, 22 October. Therefore, growing period were 164 days(T1), 149 days(T2), 134 days(T3), 119 days(T4) and 103 days(T5), respectively. In growth stage at harvest time, T1, T2, T3, T4 and T5 were early flowering, end heading, middle heading, early heading and early heading stage, respectively. Plant length and dead leaf were highest in T1, but leaf width and number of leaf were highest in T2 than others (p<0.05). Leaf length, stem diameter and number of tiller were not significantly different among the treatments (p<0.05). Stem hardness was higher in order of T1(2.0)> T2(1.9) > T3=T4(1.7) > T5($1.2kg/cm^2$). Fresh yield and dry matter yield showed significantly higher as the sowing time was faster and the cultivation period was longer (T1 > T2 > T3 > T4 > T5, p<0.05). Crude protein, crude fat and TDN content were highest in T5, but ADF and NDF content were highest in T1 than others (p<0.05). T1, T2 and T3 showed significantly higher crude protein yield compared to T4 and T5 (p<0.05). Total digestible nutrients yield were higher in order of T1 > T2 > T3 > T4 > T5 (p<0.05), and relative feed value were higher in order of T5 > T4 > T3 > T2 > T1 (p<0.05). Based on the above results, seeding dates could be recommended from the early May to the late May, and it is efficient that the cultivation period is over 150 days for dry matter yield, crude protein yield and total digestible nutrients yield.

• Korean Journal of Human Ecology
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• v.14 no.1
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• pp.47-57
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• 2005

We conducted a content analysis of the researches published for a 7-year period (1997-2003) in the Korean Journal of Play Therapy (Korean Association for Play Therapy) and The Journal of Play Therapy (Korean Association of Psychological Rehabilitation for Children). Specifically, we analyzed a total of 156 articles for research contents, instruments, subjects, statistical analytic methods, and references. The results of the study are as follows: First, the principal areas of research activity and publication were specific theoretical review, personality, and adjustment research. Most outcomes, processes, and outcome researches were conducted in a form of case study. Second, typical samples contained 4 to 6 year old children or elementary schoolers. A lot of them were counseling center clients or normally adapted children. Third, 37% of the articles used ANOVA-related statistical analytic methods, and 35% of them used descriptive statistical analytic methods. Lastly, many articles averagely cited foreign references written 11 years prior to domestic references.

• Journal of Korean Physical Therapy Science
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• v.9 no.3
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• pp.51-58
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• 2002

The purpose of this study was to investigate the general features of low back pain occurred in daily life. The study subjects were low back pain patients treated with physical therapy at general hospitals located in Gyeonggi-do from August 2, 2000 to march 4, 2002. Total number of distributed questionnaires were 750, and 630 questionnaires were collected and 571 questionnaires were collected analysed finally. The results were follows: 1. Regardless of gender, in the duration of low back pain, from 12 month to 35 month showed the highest rate, 34.1% of answerers. 2. Regardless of gender, in the season of incidence of low back pain, winter showed the highest rate, 33.8% of answerers. 3. Regardless of gender, in the time of incidence of low back pain in a day, after daily work showed the highest rate, 32.5% of answerers. 4. Regardless of gender, in the position of incidence of low back pain, from bending the body to straighten the body showed the highest rate, 32.5% of answerers. 5. Regardless of gender, 49.6% of low back pain patients answered that want to hospital for treatment 6. Regardless of gender, 97.5% of patients is answered that want to be physical therapy. 7. In the question of the effects for physical therapy, 92.2% of patients is answered that was effective.

• Korean Journal of Child Studies
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• v.26 no.6
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• pp.189-200
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• 2005

The main objectives of this study are to examine the relationships among the Bu-Ja- Yu-Chin-SungCheong, child's self differentiation and interpersonal relationship and to compare the effects of the cultural virtues. Bu-Ja-Yu-Chin-Sung-Cheong which is the Korean traditional parent-child affective bonding defined as a characteristic of relationship between parents and children within Korean culture by Choi, sang jin. The subject of the study are 656 students from 4 different elementary schools in Seoul : they were 5 and 6th grades. The study was executed by surveying them with questionnaire and the results were analyzed through co-relation analysis and multiple regression. Findings were: (l)the Korean traditional parent-child affective bonding has a positive effect on self differentiation and interpersonal relationship of a child. (2)The Korean traditional bonding has a impact on a child's acceptance of others and social behavior. However, according to the level of a child's self differentiation a child's dominance-ascendance, ostentation-narcism interpersonal relationship inclination increased.

• Journal of the Korea Concrete Institute
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• v.23 no.6
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• pp.799-808
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• 2011

In this study, a standardized test method to analyze tensile properties of multi-directional GFRP plate was proposed. Presently, tensile strength test of FRP composite reinforced with isotropic and orthotropic fiber is standardized according to ISO standard. Also, even though many studies were performed on test method to analyze the dynamic properties, the properties of tensile strength for multi-directional GFRP plate were not clearly identified. Currently, the domestic test method in accordance with ASTM, which is applicable to unidirectional FRP plate, gave tensile test results greater than actual properties. Thus, in this study, GFRP tensile test was conducted using the method found to be commonly applicable to all standards based on literature review of domestic and international references. Then, anchorage length experiments were performed using the proposed tension test method to evaluate validity of the method. Finally, optimal anchorage length was estimated from the numerical analysis to propose the standardized tensile strength method for GFRP multi-directional composite evaluation.