• Korean Journal Plant Pathology
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• v.14 no.6
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• pp.710-713
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• 1998

Spatial distribution in soil and seasonal population changes of Pasteuria nishizawae first found in Korea from soybean cyst nematode were studied. P. nishizawae infested in 61% of areas in a soybean field; in an average, about 0.3% of 46 cysts and 17.6% of 9 juveniles per 100 g soil were infested with the bacterium. The highest percentages of spore-attached nematodes were found in July (75%) and between soil depth of 11~20 cm. The number of spores per juvenile was positively correlated with the percentage of juveniles with spores (r=0.4203; P＜0.0133), but negatively correlated with the number of juveniles in soil (r=-0.3499; P＜0.042). P. nishizawae completed its life cycle in cyst and produced 1.7$\times$105 spores per cyst.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.565-566
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• 2001

To investigate the food organisms of the Chasmichthys dolichognathus during the juveniles stage, the stomach contents of fish, captured in the intertidal zone of Chungchongnam-do Sochon-gun Su-myon Dodun-ri between on early June from end of May 1998, were observed. Total length of the juveniles of C. dolichognathus was 6.5mm ∼10.0mm size, and the participation rate of feeding was 67.7％. Main food organisms were such as copepods, amphipods, shrimp larvae, polychaete larvae, and these occupied more than dry weight 2％. Copepods among them dominated the most quantitys by avergage 65.5％, and next, food organismsms appeared much by order of polychaete larvae and shrimp larvae etc. Therefore, most important food organisms of juvenile stage of C. dolichognathus were copepods, polychaete larvae, shrimp larvae etc.

• Korean Journal of Exercise Nutrition
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• v.14 no.2
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• pp.81-86
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• 2010

The purpose of this study was to identify the factors associated with child's Body Mass Index (BMI) and physical activity. The participants (n = 133) were Korean juveniles (3^rd and 4^th graders) and their parents. They completed a questionnaire packet including the SPARK (Sports, Play, and Active Recreation for Kids) survey and the parent equivalent survey. Correlation, multiple linear regression and binary logistic regression analyses were applied to identify the association between child's BMI and 10 factors of SPARK as predict or variables. 25.6% of the participants were classified as overweight (21.1%) or obesity (4.5%). 3 parental factors including mother's BMI and frequency of mother's and father's physical activity were identified as significant predictors of children's BMI. The 10 variables accounted for 28% of the variance (p<.01) in the linear regression model. These results provide insight into parental factors which are related to a child's BMI and physical activity. Parental role modeling which refers to parents' efforts to model an active lifestyle for children plays an important role.

• Journal of Aquaculture
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• v.1 no.1
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• pp.1-11
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• 1988

There are many problems to be solved for the establishment of more feasible and simplified method of seed production of marine fishes. One of the most important tasks in seed production is to clarify the feeding ecology of larvae and juveniles under. rearing conditions. In the present study, two groups of postlarvae-juveniles of the flounder, Paralichthys olivaceus were used. One ranging 11.38 to 17.08 mm in mean total length was fed with Artemia nauplii at two different water temperatures (19 to $21^{\circ}C$ and 24 to $25^{\circ}C$) and the other ranging 4.39 to 10.64 cm in mean total length was fed with prepared diet. Time required from the start of feeding to satiation was 45 to 55 minutes at 24 to $25^{\circ}C$ and nearly one hour at 19 to $21^{\circ}C$. Mean numbers of Artemia nauplii in digestive tract were 236 to 375 individuals per fish at 24 to $25^{\circ}C$. The amount of food remained in the intestine was $24.8\%$ of the total food in the digestive tract. In juveniles of 4.39 to 10.64 cm in mean total length, amount of prepared diet consumed at satiation was 0.04 to 0.46 g per fish. Digestive tract index in juveniles was rapidly decreased for 24 hours after satiation and kept nearly constant after 48 hours, showing that the time to completely digest the prepared diet in juveniles was estimated to be about 48 hours.

• The Journal of the Korea Contents Association
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• v.14 no.12
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• pp.1010-1020
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• 2014

This study intended to compare and analyze the difference between resilience and academic stress of juveniles depending on having experience in participating in the camp, and furthermore, to analyze how the camping participation degree of juveniles affect resilience and academic stress. To do so, this study selected teenagers as a population among camping ground users located in Chungcheong and Kyunggi region in 2014, sampled out total 300 participants of 150 camping participants and 150 non-participants using purposive sampling method, then selected final 295 subjects for the final analysis. Validity and credibility of questionnaire were verified through factor analysis and reliability analysis. For data processing, the t-test and multiple regression analysis were used using SPSSWIN 18.00 program. Conclusions are as follows. First, the camp participant group of juveniles showed higher resilience than the non-participant group. Secondly, it was identified that among camping participation degree of juveniles, the resilience of positivity decreased when the length of stay was longer. Thirdly, the camp participant group of juveniles showed lower academic stress than the non-participant group, but did not who significant difference statistically. Fourthly, the school record stress and assignment stress decreased when the participation degree, the length of stay, among camping participation degree of juveniles was longer. Fifthly, it was identified that the better the resilience strengthened by participating in the camp, the academic stress decreased.

• Proceedings of the Korean Society for Applied Microbiology Conference
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• 2000.04a
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• pp.201-207
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• 2000

The strategies of commercial development have been focused on the economy of scale for a process. The design of media has been recognized as a key in assuring mass production of entomopathogenic nematodes. Media optimization was conducted with insect host, proteins, lipids, and symbiotic bacteria mass. G. mellonella (insect host) produced about 290,000 infective juveniles per one. Complex media produced about 250,000 infective juveniles / ml in liquid culture within 8 days (one generation).

• The Journal of the Korea Contents Association
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• v.12 no.4
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• pp.338-348
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• 2012

The purpose of this study is to compare the effect of maum meditation program on depression, anxiety and self-esteem of the children and the juveniles. The research is based on the one-group pretest-posttest design. The data were collected from the questionnaires for the 467 children and juveniles who participated in the maum meditation program. Instruments were depression developed by Sim(1989), anxiety by Lee(2003), and self-esteem by Im(20031). The data were analyzed as descriptive statistics, paired t-test, t-test, ANOVA and Scheffe test using SPSS 17.0. The score of depression and anxiety in the children before the maum meditation program was significantly decreased after the program. The score of self-esteem of them was significantly increased after the program. The score of depression in the middle school students(14-16yr) was significantly decreased after the program. The score of self-esteem of the middle school students(14-16yr) and high school students were increased. These results indicates that maum meditation program was effective for changing children and juveniles' depression and anxiety, and it contributed to the enhancement of self-esteem.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.6
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• pp.2520-2527
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• 2012

The Purpose of this study is to exame the effectiveness of music therapy program on self efficacy of juveniles with internet game addiction. The study was carried out with 9 juveniles who were belonging to a dangerous user group and a warning user group in the internet addiction observer index, and attended K City K Youth Center. To test the effectiveness of the program, this study employed pretest-posttest simple group design. the date were analyzed by t-test. As the result, The Music therapy program was verified to effect on enhancing self efficacy of the juveniles with internet game addiction. The limitations of the study were discussed, as well as the application of the study results and recommendations for additional exploratory research.

• Journal of Fisheries and Marine Sciences Education
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• v.28 no.1
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• pp.180-185
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• 2016

To investigate the feeding habits of Tridentiger trigonocephalus juveniles captured in the intertidal zone of Dodun-ri, Seocheon-gun from the end of May to early June 2012, the gut contents were observed. Feeding incidence of the juveniles increased twice a day, first in the morning and second in the afternoon. The major food organisms of the juveniles (6.5~10.0 mm NL) were composed of copepods (65.4%), amphipods (2.0%), shrimp larvae (14.5%), polychaete larvae (22.6%), and etc. These food items held more than 2 percentage in the dry weight of the total food items.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.36 no.5
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• pp.486-494
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• 2003

Distribution of ichthyoplanktons and its relation to environmental factors (temperature, salinity, $chlorophyll\;\alpha$) around the Youngsan River Estuary of Mokpo, southwest coast of Korea were investigated based on the samples collected bimonthly from February to December, 2001. Unidentified fish eggs were most abundant $1,345\;eggs/100m^3$ in August, while eggs of Engraulis japonicus were most abundant $63\;eggs/100m^3$ in June. A total of forty species of fish larvae and juveniles belonging to the twenty families under six orders were caught, with six gobiids, four icefishes, four croakers and three herrings being represented. Fish larvae and juveniles peaked $17,757\;inds./100m^3$ in August, which consisted of $91.02\%$ of gobiids, $3.69\%$ of gunnels and $3.67\%$ of icefishes, and they were most abundant $7,467\;Inds./100m^3$ at St. 7. Cluster analysis based on the individuals of fish larvae and juveniles showed that six months were classified into two groups at the dissimilarity 70, the first was composed of June and August and the second was February and December and April and October were not clustered with any other months. In August when species diversity index was the highest, eight stations were classified into two groups at the dissimilarity 70, the first was composed of St. 1, 3, 4, 5 and 8 and the second was St. 6, 7 and 2. As a result from correspondence analysis, there is no effect of the environmental factors with a density of fish eggs and larvae, but correlation could be found between a density of fish eggs and $chlorophyll\;\alpha.$