• Korean Journal of Ecology and Environment
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• v.37 no.1 s.106
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• pp.130-136
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• 2004

In the present study, prey preference of juvenile fishes was examined using an experimental approach. Zooplankton composition, as a prey of the fish, was evaluated by taking into account the species as well as body size of juveniles in the aquarium. The predation of juvenile fishes is known to be an important factor in changes of zooplankton communities. In some previous studies at the regulated Nakdong River, the collapse of large cladcoerans and an increase in the rotifer population by selective predation during spring and summer were observed. This study focused on the predation of juvenile fishes such as Hyporhamphus sajori, Rhinogobius brunneus, and Opsariichtys uncirostris amurensis on zooplankton community structure in mesocosm scale experiments. These fishes selected the cladoceran Moina micrura with highest individual preference value (Manly/Chesson index)among zooplankton prey in the experimental aquarium. When the size-selective prey preferences of the juvenile fish were compared, both small (body size <2 cm) and large (body size >2cm) juveniles of O. uncirostris positively selected M. micrura. In the outdoor experimental tanks, juvenile fishes consumed the cladoceran M. micrura, resulting in an high abundance of the rotifer, Polyarthra spp. The results suggest that juvenile fish predation may play an important role in regulating the zooplankton community structure by reducing the cladoceran density and increase of rotifers in the Nakdong River during spring and summer.

• Clinical and Experimental Pediatrics
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• v.46 no.10
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• pp.958-965
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• 2003

Purpose : Recently the number of juvenile delinquents have been increasing in Korea and their misdeeds were getting worse. This study was conducted to find out the basic cause of juvenile delinquency and a counterplan of overcoming this distress. Methods : The authors reviewed the statistics of the Supreme Public Prosecutors Office to know the juvenile delinquents and Korean national statistics to know the changes of family environments. The author conducted a study on the family environments between student group and juvenile delinquent group in jail, and also investigated the value judgement of middle and high school students to know the difference between the recent adolescents and the youth before 1945. Results : Nuclear families, dual-income families and divorce rates have remarkably been increased recently. All of which are considered to be the basic cause of getting worse in home teaching. It was found that the delinquent group have more defective families, poorer economic status, poorer parent's educational level than the student group, and also found that the value judgement of recent youth were quite different from that of youth before 1945. Conclusion : Industrialization have changed our home-environment rapidly which made home-teaching poorer, and the children were being insecure and melancholy, which consequently made them more abnormal youth and juvenile delinquents in Korea.

• Journal of the Korean Wood Science and Technology
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• v.21 no.3
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• pp.45-52
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• 1993

Surveyed results on the slope of grain and the twist of sawn lumber of Pinus koraiensis, Larix leptolepis, and Pinus densiflora were summarized as follows: 1. The slope of grain of Pinus koraiensis has a Z-grain in the stem axis. The slope of grain was found to be the lowest at near to the pith and then constantly increased. At the height of 0.2m from the base of stem. a cross section of 35 annual rings was found to have a repeatedly increasing and decreasing slope of grain and then constantly decreased. At the height of 1.2m to 7.2m from the base of stem, the slope of grain increased conspicuously until the 10th annual ring, after which it increased near to the bark with repeatedly increasing and decreasing trends. 2. Pinus densiflora has a S-grain in the stem axis. The lowest slope of grain was found at near to the pith, and the highest in the 10 to 35 annual rings from the pith. 3. Larix leptolepis has a S-grain. At the height of 3.2m from the base of stem, the big fluctuation of the slope of grain was found without any particular trend. 4. The slope of grain and the twist between natural and reforested timber of Pinus koraiensis were found to be almost the same trend in viewpoint of the annual ring. The maximum slope of grain of imported Siberian timber of Pinus koraiensis was found at the 10 annual rings, which was quite similar to that of native species in Korea, but the big difference of the twist was found at 140 annual rings. 5. The twist was little at the mature wood of reforested Pinus koraiensis and Siberians and the duplicated part of mature and juvenile woods of those. On the contrary, the twist was great at the duplicated part of mature and juvenile woods of Pinus koraiensis. 6. The twist of Larix leptolepis showed the S-direction which coincided with that of slope of grain. The twist was greatest at the part of juvenile wood and little at the duplicated part of mature and juvenile woods, and little difference of twist was found between mature and juvenile woods. 7. Siberian larix having a minimum slope of grain showed the lowest twist, and the twist at the duplicated part of mature and juvenile woods showed a middle level of both mature and juvenile woods' portions.

• Journal of the Korean Wood Science and Technology
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• v.10 no.1
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• pp.38-46
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• 1982

The research was carried out to determine the division of juvenile and adult wood from the pattern of variables of wood quality indicators, to investigate general low of the size of juwenile wood and to study the characteristics of juvenile and adult wood. For this study some trees of Pinus koraiensis were selected and several wood quality indicators such as annual ring width. late wood percentage, tracheid length tracheid diameter, wall thicknes, and microfibril angles were measured. The results of this study were summaried as follows. 1) Juvenile and adult wood can be divided into radial variations of wood quality indicators. In this study juvenile wood might be classified as a large fluctuated region of radial wood quality variations in the nearest part to pith. 2) Juvenile wood was indicated as a part of nearly cylinderical shape, averaging 6-11cm in radius, near pith. 3) Number of rings from pith of juvenile wood was about 12-20 and was nearly constant in uniform growth trees among the forest stands. 4) Usually adult wood was formed within the about 5-10m above ground.

• Korean Journal of Social Welfare
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• v.51
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• pp.183-210
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• 2002

The purpose of this study is to investigate correction-level associated with the social support perceived by juvenile delinquents. To accomplish these purposes, this study used sample of 546 juvenile delinquents who are in the process of the beginning stage in the police and prosecution. Social support and correction were assessed with an instrument designed for this study. Juvenile delinquents completed instruments assessing the following variables: (1) perceived social support scale, specially social support types(esteem support, emotional support, informational support) and social support providers (parents, relatives, friends, teachers, community) (2) correction scale, specially social stigma, social deprivation, self reflection, legal consciousness, self concept. The resulting scale of the instrument had good internal reliability(Cronbach's alpha=. ) and was scored so that high scores indicated a willingness to access. To examine this purpose, One way ANOVA, multiple regression analysis were conducted. And the results are as follows: The relationship ratings of the correction factors were positively associated with their rating of the type of social support. Informational support was positively associated with self reflection and esteem support was positively associated with self concept, legal consciousness, self reflection and emotional support were positively associated with esteem. The type of support according to support providers was significant, explaining 25% of the variance in self concept scores. The significant predictor was esteem support from friends and emotional support from a community. The type of support according to support providers was significant, explaining 20% of the variance in legal consciousness scores. The significant predictor was informational support from teachers and esteem support from a community. The type of support according to support providers was significant, explaining 21% of the variance in self reflection scores. The significant predictor was esteem support and emotional one from relatives.

• Korean Journal of Environmental Biology
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• v.40 no.3
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• pp.255-266
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• 2022

In crustaceans, molting is regulated by interactions between ecdysteroid and juvenile hormone (JH) signaling pathway-related genes. Unlike the ecdysteroid signaling pathway, little information on the role of JH signaling pathway-related genes in molting is available in zooplanktonic crustaceans. In this study, three genes (juvenile hormone acid O-methyltransferase (JHAMT), methoprene-tolerant (Met), and juvenile hormone epoxide hydrolase (JHEH)) which are involved in the synthesis, receptor-binding, and degradation of JH were identified using sequence and phylogenetic analysis in the brackish water flea, Diaphanosoma celebensis. Transcriptional changes in these genes during the molting cycle in D. celebensis were analyzed. Sequence and phylogenetic analysis revealed that these putative proteins may be functionally conserved along with those of insects and other crustaceans. In addition, the expression of the three genes was correlated with the molting cycle of D. celebensis, indicating that these genes may be involved in the synthesis and degradation of JH, resulting in normal molting. This study will provide information for a better understanding of the role of JH signaling pathway-related genes during the molting process in Cladocera.

• The Journal of the Korea Contents Association
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• v.17 no.8
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• pp.39-52
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• 2017

The purpose of this study was to examine the mediating effects of mobile phone dependency in the relationship between parenting attitude and juvenile delinquency. This study used the secondary data from the $1^{st}$, $2^{nd}$ and $3^{rd}$ waves of the Korean Children and Youth Panel Survey(2010, KCYPS). The data of 2,086 middle school students were analyzed by utilizing Structural Equation Model(SEM). The results are as follows. First, positive and negative parenting attitudes had no direct effects on juvenile delinquency, while positive parenting attitudes had significantly decreased adolescents' mobile phone dependency. In addition, negative parenting attitudes had positive effects on adolescents' mobile phone delinquency. Second, mobile phone dependency was fully mediated by parenting attitudes and juvenile delinquency. On the basis of these results of study, policy and practice implications were discussed to reduce juvenile delinquency by improving parenting attitudes.

• Research in Community and Public Health Nursing
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• v.8 no.1
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• pp.102-115
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• 1997

The purpose of this study was to determine an effect of the health camp program on self-efficacy, sick-role behavioral compliance and glucose metabolism in juvenile diabetes mellitus patients. The quasi -experimental study was designed using a nonequivalent control group pre-posttest design with the framework of Bandura's self-efficacy theory. Forty-two juvenile diabetes mellitus patients participating in this study were selected from outpatients. Of these, twenty-one were assigned to the experimental group and twenty-one to the control group. The period of data collection was from August 8 to December 9 in 1994. The health camp program for the experimental group was carried out over 6 days and the control group did not participate in the program. Collection data was analyzed by means of chi - square test, t - test, ANCOVA, Pearson correlation with SPSS /PC+. The result were summarized as follows: 1. The health camp program was effective in in-creasing the scores of self-efficacy for juven-ile diabetes mellitus patients. 2. The health camp program was effective in increasing the scores of sick - role behavioral compliance for juvenile diabetes mellitus patients. 3. The health camp program was not effective in decreasing the levels of glucose metabolism. 4. The more self-efficacy increased, the more sick - role behavioral compliance increased. 5. Boys showed the higher self-efficacy than girls and the group with diabetes patients whose family members are also patients, showed the higher self-efficacy and sick-role behavioral compliance than the group without diabetic patient among the family members. Thus, it can be concluded that the health camp program was a useful health intervention for juvenile diabetes mellitus patients.

• The Journal of Pediatrics of Korean Medicine
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• v.24 no.1
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• pp.57-64
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• 2010

Objectives This study is to examine case that has an significant result on treating Polyarticular Type Juvenile Idiopathic Arthritis(JIA) the patient who did not response to DMARDs and NSAIDs with oriental medicine. JIA is the most common form of persistent arthritis in children before age 16. The symptoms of JIA is pain and edema of joints, fever, lethargy, reduced physical activity, and poor appetite. But the symptoms vary. Methods The patient felt pain and had limitation of mobility on his joints, but the DMARDs and NSAIDs were not effective. Therefore, he was treated with oriental medicine and withdrew from DMARDs and NSAIDs. The patient took DMARDs and NSAIDs from May 2007 to November 2008(He did not took DMARDs and NSAIDs from December 2007 to June 2008), and took oriental medicine from November 2008 until now. Results The patient's pain and limited mobility on his joints, edema, morning stiffness, fatigue was gone, and could maintain the condition. He doesn't have DMARDs or any other western medicine anymore. Conclusions This study shows that a Polyarticular Type Juvenile Idiopathic Arthritis patient who had ineffective response to DMARDs and NSAIDs can reach to the clinical remission by oriental medicine treatment. His morning stiffness, fatigue, pain of joints, edema was gone and ESR was in normal range with Oriental medicine treatment.

• Journal of the Korean Wood Science and Technology
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• v.21 no.2
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• pp.73-80
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• 1993

Pinus koraiensis is one of the most important reforestation species which had widely been planted around the country. Therefore, there are great research needs on the fundamental properties of wood to extend the frequency of uses and adequate availabilities. Research results on the characteristics of anatomical wood properties and changes are summarized as follows: 1. At a horizontal direction of tree trunk, the tracheid length at outer wood gradually becomes shorter as it reaches to pith. The tracheid length having between 32 and 42 annual rings showed over 2.5 times longer than that of pith, and also its length increases from the bottom to the top of the stem. 2. The tracheid diameters in latewood showed a little fluctuations, and the shortest near to the pith in earlywood. The tracheid diameters in earlywood are more than 2 times those of latewood, and the differences between the mature and juvenile wood in earlywood are less than 10${\mu}m$. 3. The tracheid wall thickness in early wood showed a little fluctuations. On the contrary, tracheid wall thickness in latewood rapidly increases from the pith to the bark. The tracheid wall of mature wood showed 10 to 20% thicker than that of juvenile wood. 4. The fibril angle at the secondary walls of tracheid within an annual ring showed higher degree in earlywood than that of latewood. The highest tracheid fibril angle was observed at around the pith of both earlywood and latewood. Then, fibril angle slowly decreased toward outer wood, and was stabilized after 15 years. 5. Structural boundaries between mature and juvenile wood from Pinus koraiensis are divided by 13 to 19 annual ring and distance of 5 to 8cm from the pith.