• Journal of the Korea Society of Computer and Information
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• v.25 no.9
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• pp.159-166
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• 2020

The purpose of this research is to suggest some practical and policy implications for improving adolescent's self-esteem through analyzing longitudinally the effects of parental attitude, peer relationship, student-teacher relationship, school learning activity, life-goal on adolescent's self-esteem by using latent growth curve model. Analytical data was obtained from the KYCPS. The analytical results showed that the change model of adolescent's self_esteem turned out to be a leaner model in which the change rate and intercept were significant. Second, time dependent variables influence on adolescent's self_ esteem meaningfully. Third, time dependent variables influence on adolescent's self_ esteem changes significantly. This study proposed some policy implications basing on these findings.

• Journal of the Korea Society of Computer and Information
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• v.25 no.8
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• pp.173-179
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• 2020

The purpose of this study was to examine the effects of peer attachment and parental abuse on adolescents' dependence on mobile phones and the mediating effect of self-esteem. For this study, I used the panel data of the 7th year of the 1st grade of the elementary school for the Korean Children and Youth Panel Survey provided by the Korea Youth Policy Institute. A total of 1,937 adolescents were selected to analyze causal relationship among variables, and SPSS 26.0 and AMOS 26.0 were used to verify research problem. As a result of the study, First, the better the relationship with peers, the higher the self-esteem and the less the dependence on their mobile phone. On the other hand, the more severe the abuse, the lower the self-esteem and the higher the dependence on mobile phones. Second, Self-esteem was found to have a significant effect on peer attachment and abuse on mobile phone dependence. Based on these results, I would like to provide them as basic data for helping positive development of adolescents.

• Lingua Humanitatis
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• v.1 no.1
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• pp.255-274
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• 2001

This paper examines the history of Korean names, focusing on the structural characteristics and the literal meanings of those for kings and ordinary people. Roughly speaking, the Korean surname system traces its source to China. Historical records show that the Chinese were already using their family names around 1000 B.C. After a millennium or so, the Korean began to follow suit. Initially, however, surnames were in regular use among kings and their kin only: it was not until the late Shilla dynasty, around A.D. 800, that the commoners began to have Heir surnames. And yet, surnames still tended to be limited to men of noble birth, until around A.D. 1000. Though the Korean surname system may be said to have its origin in Chinese, there are no lack of native surnames that have as long a history, e.g., Hae, Bak, Sok, Sol, Ul, and Ol. Typical surnames of Chinese origin that are found during the late Shilla dynasty, around A.D. 900, include Jang (as in Jang Bogo) and Choi (as in Choi Chiwon). Unlike those of Chinese origin, typical Korean names during the age of Three Nations tended to allude to nature or natural phenomena, as can be witnessed in Bit 'light,' Balgum 'bright,' Nuri 'world,' and Soidori where soi means 'steel' and dol 'stone,' Other surnames abound that have to do with river, stream, field, prairie, and so on. King Muryong's original name was Sama, a variant of som 'island,' indicating where he was born. A person skilled in archery was called Jumong or Hwalbo. Baembo was so called because he 'crawls like a snake, baem,' In these last two examples, bo, as well as its variant bu, functions as a suffix, and is also found in Cochilbu, Isabu, Babo, Nolbu, Hungbu, etc. The tradition of using this kind of native Korean names has gradually disappeared, giving place to the names of Chinese style-although very recently we see an on-going movement toward using native names.

• Journal of Adhesion and Interface
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• v.22 no.1
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• pp.8-15
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• 2021

In this study, a polyol was prepared using Jeffamine D-400 as a propylene glycol-based diamine to impart flexibility to the urethane-modified epoxy, and a urethane-modified epoxy was synthesized using the polyol. Urethane-modified epoxy synthesized with existing Bisphenol A diglycidyl ether (BADGE) epoxy, a curing agent, and a curing accelerator are mixed to prepare an epoxy adhesive, and shear strength is measured by measuring adhesion strength. As a result, shear strength and shear elongation tended to increase. These results are due to the high crosslinking density. It is believed that it can be applied to structural adhesives that are restricted in use.

• Journal of Powder Materials
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• v.30 no.6
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• pp.516-520
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• 2023

Highly safe lithium-ion batteries (LIBs) are required for large-scale applications such as electrical vehicles and energy storage systems. A highly stable cathode is essential for the development of safe LIBs. LiFePO₄ is one of the most stable cathodes because of its stable structure and strong bonding between P and O. However, it has a lower energy density than lithium transition metal oxides. To investigate the high energy density of phosphate materials, vanadium phosphates were investigated. Vanadium enables multiple redox reactions as well as high redox potentials. LiVPO₄O has two redox reactions (V⁵⁺/V⁴⁺/V³⁺) but low electrochemical activity. In this study, LiVPO₄O is doped with fluorine to improve its electrochemical activity and increase its operational redox potential. With increasing fluorine content in LiVPO₄O_1-xF_x, the local vanadium structure changed as the vanadium oxidation state changed. In addition, the operating potential increased with increasing fluorine content. Thus, it was confirmed that fluorine doping leads to a strong inductive effect and high operating voltage, which helps improve the energy density of the cathode materials.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.29 no.4
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• pp.170-181
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• 2011

This Research will explore the meaning indicated in the landscape meaning and feature of literary group culture, focusing in Gurujeong(九老亭: pavilion for nine elders) and Samgaeseokmun(三溪石門: stone gate in three valleys) located in Dundeok-myun, Imshil-gun, and will seek to understand the implications by studying the cultural landscape spread out in the area. The place where Gurojeong and Samgaeseokmun is located is the meeting point of the three valleys, Dunnam stream, Osu stream, and Yul stream, which is the main location to view the beautiful scenery, which has the nickname as the dwelling place of a celestial being. Especially, based on the description of old maps, "Samgae(three valleys)" and "Samgaeseokmun" possesses significance as a landmark and shows a characteristic feature of landscape structures of low hills. Dangugurohwe(丹丘九老會: nine elders gathering on the dwelling of a celestial being) originated from Hyangsangurohwe(香山九老會: gathering of nine elders on a fragrant mountain), where Baekgeoi(白居易) of China was one of the main people. This group was organized by nine elders over the age of 60 desiring to view the scenery of Doyeonmyeong. The group enhanced the literary spirit on the low hill, erecting a tower, and enjoying the beautiful scenery changing every season with scholars from the same region. This phenomenon seems to have been formed upon the positive response to gatherings of elders, which were prevalent in the Joseon Dynasty. If the internal idea pursued by the group was "longevity," the external idea pursued can be summarized as "the spirit the respect for the elders." Naming the groups as 'Dangudae(place where the celestial being lives), Guseondong(valley of seeking a celestial life), Bangjangsan(mountain of a high priest), and Daecheondae(place of communicating with God) was likely a device to introspect oneself and symbolize one's life process. Furthermore, the reason Samgaeseokmun, which is an imitation of Choi, Chiwon's work, was built near Soyocheo, was probably to yearn the celestial land and based on the desire to follow Choi, Chiwon, who was the most self-fulfilling being presumed to have become a celestial being by practicing the pursuit of freedom, escaping from the reality. After tracing the symbolizing meaning of the four letters carved in the left side of the stone wall of Dangudae, the conclusion that this place was not only a place for literary gatherings of the nine elders of Saseong(four families), but was a place where the celestial being dwelled could be inferred. Corresponding with Dangudae and Gurojeong, which are places where the order of human and nature is harmonized and where its meaning associated with the location intensifies, arouses strong bond, can be said to be the symbol of the traces of celestial beings where the spirits of attachment to a certain place is embedded. The acts performed in Dangugurohwe were those of traditional leisure including strolling, viewing the scenery, drinking, composing poems, and playing instruments, and sometimes listening to stories, tea ceremony, prayers, and fishing were added, which indicates that the gathering had a strong tendency towards pastoral and hermit life.

• Horticultural Science & Technology
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• v.35 no.4
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• pp.431-438
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• 2017

This study investigated the effect of pre-planting nitrogen (N) fertilization levels added to a soilless root medium on the growth of 'Dotaerang Dia' tomato seedlings. The N levels were varied for a total of 7 treatments: 0, 100, 250, 500, 750, 1,000, or $1,500mg{\cdot}L^{-1}$. The pH of the root media gradually rose in all treatments as the seedlings grew; however, the differences in the pH were not significant among the treatments. The electrical conductivity (EC) of the root media was significantly different among the treatments from sowing to week three, then drastically decreased after week four, which diminished the differences in the EC among the treatments. At week six, plant height, leaf length, leaf width, number of leaves, and fresh and dry weights of the shoot were highest for the treatment with $500mg{\cdot}L^{-1}N$. In contrast, the treatment with $1,500mg{\cdot}L^{-1}N$ had the lowest results for all growth measurements. The fresh weight was 67% heavier in the $500mg{\cdot}L^{-1}N$ treatment compared to the $1,500mg{\cdot}L^{-1}N$ treatment. The total N content in the tissues was lowest in the treatment with $0mg{\cdot}L^{-1}N$ and highest in the treatment with $1,000mg{\cdot}L^{-1}N$. The contents of calcium (Ca), magnesium (Mg), and metal micronutrients in the tissues were highest in the $250mg{\cdot}L^{-1}N$ treatment. A previous study demonstrated that adjusting the fertilization level to promote growth to over 90% of the maximum growth is a good strategy for lowering production costs and preventing damage due to excessive fertilizer absorption by crops. Our results indicated that the optimal pre-planting N fertilization level for tomato plug seedlings should be lower than $500mg{\cdot}L^{-1}$ and the optimum tissue N contents should be around 3.21% to 4.60%.

• Journal of the Korean Institute of Landscape Architecture
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• v.46 no.5
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• pp.22-35
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• 2018

The purpose of this study is to understand the idea of the ideal garden, pursued by Dasan, by analyzing the production process of his writing and the location of his dwelling, and the characteristics of the garden in the writings of Dasan (茶山) Jeong Yag-Yong (丁若鏞)'s "Jaehwangsangyuincheop (題黃裳幽人帖)" is concerned with his writings on an imaginary garden (意園). This paper assumed that "Jaehwangsangyuincheop" served as a blueprint for his ideal dwelling. The main research subjects are the external scenes described in the "Jaehwangsangyuincheop", and the garden elements and spatial construction that were visualized as a Korean Ink Painting (水墨畵) through the analysis of related works. The results are as follows. First, Hwang Sang was Dasan's favorite pupil, and "Jaehwangsangyuincheop" was written by Dasan while at Boeunsanbang in the winter of 1805 as an answer to a question that Hwang Sang posed about the residence of a hermit. By referring to this response, Hwang Sang established Ilsoksanbang (一粟山房) under Mt. Cheongae in Daegu-myeon, Gangjin. Secondly, the residence in "Jaehwangsangyuincheop" has mountains behind it and water in front of it (背山臨水). The residence was used as a place to combine life and leisure. It was an ideal residence that secluded the scholar(隱士). Thirdly, Dasan's ideal garden was shown as operation of natural geography in a residential location, practically using various plant materials, expanding physical boundaries of garden, pursuing synesthetic aesthetics while enjoying garden elements, and having an active experience of the taste for the arts in the extended garden. "Jaehwangsangyuincheop" depicted the life of a scholar with the taste of elegance (雅趣), who live in reclusiveness (隱逸), which was wanted by Dasan after exile. It was realized as Ilsoksanbang. "Jaehwangsangyuincheop" was interpreted as the ideal of a feasible dwelling that faithfully reflects Dasan's conceptual thoughts on the garden.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.32 no.3
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• pp.139-153
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• 2014

This study contemplates the utopian landscape recognized by the scholars with twenty three pieces of 'travel record'. Consequently, five key words - Mureungdowon(武陵桃源), Byeolcheonji(別天地), Dongcheon(洞天), Chonghakdong, Eungeoji(hermitage) - are chosen for comprehending the utopia and their landscape characteristics are organised as follows. Mureungdowon in Jirisan Mountain which the scholars dreamed of is a flatland with the full energy for local vegetation and domestic animals in the mysterious and deep gorge. This utopia eventually reflects the rural landscape. Byeolcheonji is a utopia combining the concept of a fairyland and beautiful scenery. The scholars also used the term 'Dongcheon' for naming the enclosed landform which is suitable for seclusion and defining the some areas of beautiful scenery. Cheonghakdong, which is set only in Jirisan Mountain, has been formed by the stone scenery of gorges and Buril waterfalls around the whole area of Burilam Hermitage, the vegetation scenery of pine trees and bamboos with the legend of Choi Chiwon and his engraved inscription on a rock. Adding to the utopia passed down, the scholars perceived the village with geographical features with back to the mountain and facing the water, the river practising the trade, the flatland enclosed by bamboo forests, the vegetation mainly consisting of fruit trees and beautiful scenery as the utopia realized on earth. It is equivalent to the world of human beings laboring appropriately and living in Mother Nature. As mentioned above, this study has significance for apprehending the relevance between the culture of strolling in the mountains by the scholars of Joseon Dynasty and the fairyland and explaining the various traditional utopias from the inherited concepts from China to the naturalized realistic utopia.

• Journal of Korean Society of Forest Science
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• v.104 no.2
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• pp.261-266
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• 2015

This study was conducted to examine the effect of tree density of Pinus koraiensis forest on the thermal comfort and the physiological response of human body in summer season. As the indicators of thermal comfort were used the predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD), while the heart rate variability was used for the physiological indicator of subjects. The subjects were 15 physically healthy men and women in their 20s ($23.7{\pm}1.7$ years old). The subjects sat in each site to measure HRV for 5 minutes and the thermal comfort of each site was measured. As a results, it was proven by PMV and PPD that the Pinus koraiensis forest with 120% tree density was thermally more comfortable than the Pinus koraiensis forest with 80% tree density. In case of the subjects' physiological response, the Pinus koraiensis forest with 120% tree density showed significantly higher HF of HRV than the Pinus koraiensis forest with 80% tree density and significantly lower LF/HF. Therefore, the findings of this study scientifically proved that the Pinus koraiensis forest with 120% tree density is thermally more comfortable and physiologically more relaxing than the Pinus koraiensis forest with 80% tree density.