• Composites Research
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• v.31 no.4
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• pp.117-121
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• 2018

Various ceramic particulate such as TiC, $TiB_2$, $Al_2O_3$ reinforced SUS431 matrix composites were successfully fabricated by a novel liquid pressing infiltration process. Microstructures of the SUS431 composite were analyzed to determine manufacturability of composites. $Al_2O_3$-SUS431 composite had lots of defects due to poor wettability between the $Al_2O_3$ and steel matrix. On the other hand, TiC was uniformly dispersed in the SUS431 matrix than $TiB_2$ and $Al_2O_3$ due to good wettability and interfacial properties.

• Korean Security Journal
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• no.16
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• pp.229-241
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• 2008

he guarding system of the "Choson" era is completed by the Gyeongguk-daejeon(an administrative canon) at the kings "Sejong" and "Yejong", and it is supplemented at the King "Seongjong". "Geum-gun" is composed of "Naegeum-wi", "Gyeombok-sa", "Wirim-wi" and "Jeongro-wi" in the period before the Japanese Aggression of Korea in 1952, and in the period after the aggression war, the organization of the "Geum-gun" is changed repeatedly according to circumstances in the period after the aggression. They("Geum-gun") devote themselves to the protection of kings and the capital defense in the first period of the "Choson" era. The most important change of the "Geum-gun" is the practice of five military units system, three military units of them, "Hunryeon-dogam", "Eoyeong-cheong" and "Geumwi-yeong", take charge of the guard of kings and the capital defense, and "Chongyung-cheong" and "Sueo-cheong" take charge of the defense of the outer areas of the capital region with key positions located at "Namhan-sanseong" and "Bukhan-sanseong"(mountain fortress Walls). The function of the "Geum-gun" is extended through the aggressions, therefore the number of soldiers is increased greatly. The guarding system for the country and its royal family is frequently changed according to the improvement of the people's position with themselves-awakening and their understanding of realities. The reorganization of the "Geum-gun" including "Howi-cheong", "Geumgun-cheong", "Sukwi-so" and "Jangyong-yeong" is unavoidable to strengthen the royal rights that are weaken by deposing the king "Injo". The standing of the existing organizations is changed many times with financial problems. The enthronement of the king "Jeongjo" is a great epoch in the change of the guarding system.

• Korean Journal of Family Social Work
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• no.61
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• pp.93-136
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• 2018

The purpose of this study is to find specific practice methods of single parents self-help groups in community welfare centers. A participatory action research was conducted to achieve the purpose. Six social workers and three researchers participated in the study who shared the problem of lack of specific practice methods even though a self-help group was useful for self-reliance and empowerment of low-income single-parents. Various activities such as reading articles, analysis of each self-help group, case studies, and learning facilitation methods were conducted during 10 meetings. At the same time, peer supervision proceeded at each meeting. The progress of each group was shared, the application of practice methods and plans were discussed, and applying discussed methods to group practice and reviewing the process and outcomes of the practice were repeated in the peer supervison. As a result, the following positive changes appeared: First, the goals and vision of each group became clearer. Second, initiative of the members was promoted. Third, intimacy, mutual cooperation, the attatchment to the group were strengthened. A qualitative analysis was also conducted on the content discussed. As a result, 17 practice methods were derived in four themes such as initiative/ empowerment, cohesion, leadership, and destandardization. Practice issues concerning single parents self-help groups in community welfare centers were discussed based on the results.

• Journal of the Korean Society of Child Welfare
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• no.27
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• pp.69-93
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• 2008

The study tried to identify suicidal factors of adolescences by analyzing effect factors of adolescences' suicide. Demographic factor, Self-respect, depression, suicidal ideation, and school adjustment scale, Social support, self-regulation, and problem solving scale were analyzed as effect factors. 307 junior high and high school students in Pusan city were surveyed by community education experts for this research. As a result, there are significant differences between high suicidal risk group and low suicidal group in all subcategories including economic status. As for the correlation analysis between risk factors and preventive factors, variables, it was analyzed that each variable was correlated to other variables. In addition, multiple regression analysis was conducted to find out affecting factors of adolescence suicide categorized into demographic factor, personal factor, school factor, and social factor. As a result, it was founded that the affecting factors of adolescence suicide were school adjustment, problem solving ability, suicidal ideation, depression and neighborsupport, and self-regulation. That is, to prevent adolescence suicide, the adolescence who are exposed to suicidal risk should be identified by measuring the degree of suicidal ideation, strengthened their school adjustment, and then conducted group therapy to strengthen their problem solving ability and self-regulation. In addition, adolescence suicide can be prevented by strengtheningsocial support for adolescences.

• Korean Journal of Heritage: History & Science
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• v.47 no.3
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• pp.108-127
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• 2014

Gangwha was a capital city of Goryeo, in spite of short-term occupation, where various national facilities such as palace stood in a row. Nevertheless, its historic importance has been undervalued owing to undiscovered palace. According to ${\ll}Goryeosa{\gg}$, palace in Gangwha was built in imitation of that of Gaegyeong. If it is true, the site of the old palace in Gaeseong as an original could give significant information for that of Gangwha. The distinct feature of Gaegyeong is that the palace was located in the west area of the centerline from north to south and pond lay in the east side. There is a mountain in the center of capital and two rivers runs along side the mountain. Gunggol at Gwancheong-ri is a best place where structural peculiarities of Gaegyeong can be applicable to Gangwha. There is an area of celadon distribution and is some topographic similarities such as central mountain, two rivers are quite similar. It is assumable that excavation result of no. 405 Gwancheongri reflects the function of east pond and thoroughfare responds to main street from north to south of Gaegyeong. After all the analysis from archaeological information, old maps, cadastral maps, topographic similarities and so on, Gunggol at Gwancheong-ri within an arc shape road is a most suitable place as palace in Gangwha.

• Journal of Food Hygiene and Safety
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• v.29 no.2
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• pp.99-104
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• 2014

This study was done to analyze the contents of minerals and to investigate the ratio of measured values to labeled values and to analyze the ratio of calcium to other minerals in 68 specimen with minerals - fortified commercial beverages, noodles, cereals and grain products. Content of calcium, iron and zinc in samples after microwave digestion was analyzed with an ICP-OES. The measured values of calcium were ranged 82.2~293.1% of the labeled values in 38 samples composed calcium - fortified commercial beverages, noodles, cereals and grain products. The measured values of iron and zinc were ranged 83.3~301.0%, 90.1~314.1% of the labeled values in minerals - fortified commercial beverages, noodles, cereals and grain products, 42, 24 samples. The Ca : Fe ratios were 90.55 (50.55~220.64) in fruit & vegetable juice, 850.41 in fruit & vegetable beverage, 553.49 in blended beverage, 179.07 (118.37~238.01) in soy milk, 204.39(41.64~397.52) in noodle, 296.97(121.64~868.88) in fried noodle, 30.89(15.69~62.05) in cereal and 7.73(0.22~49.92) in grain product. The Ca : P ratios were 1.44(0.96~1.98) in fruit & vegetable juice, 1.92 in fruit & vegetable beverage, 1.66 in blended beverage, 4.23(2.25~7.72) in soy milk, 1.14(0.28~1.97) in noodle, 1.88(1.17~2.42) in fried noodle, 1.29(0.87~2.92) in cereal and 0.30(0.06~1.57) in grain product. The Ca : Mg ratios were 1.85(0.87~5.04) in fruit & vegetable juice, 28.72 in fruit & vegetable beverage, 2.97 in blended beverage, 5.27(2.93~9.36) in soy milk, 3.97(1.34~7.57) in noodle, 6.77(4.63~10.78) in fried noodle, 4.40(2.30~12.55) in cereal and 1.17(0.23~7.48) in grain product. These results suggest calcium contents and the ratio of calcium contents to other minerals in calcium-fortified food products should be strictly controlled. Moreover, to avoid problems with Excessive nutrition, there must be initiatives for better understanding on food labelling and nutrition for fortified food.

• Journal of Dental Rehabilitation and Applied Science
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• v.27 no.1
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• pp.1-13
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• 2011

The aim of this study was to evaluate shear bond strength of pressed reinforced composite resin ($TESCERA^{TM}$ ATL) veneering to zirconia with various surface treatments. Forty sintered zirconia specimens and forty pockmarked zirconia specimens were fabricated. All the materials were categorized as Group 1 (Control : porcelain veneering on zirconia surface), Group 2 ( $TESCERA^{TM}$ ATL dentine veneering after bonding agent application on zirconia surface), Group 3 ($TESCERA^{TM}$ ATL dentine veneering on pockmarked zirconia surface), Group 4 ($TESCERA^{TM}$ ATL dentine veneering after bonding agent application on pockmarked zirconia surface), Group 5 (Thermocycling on Group 1), Group 6 (Thermocycling on Group 2), Group 7 (Thermocycling on Group 3), and Group 8 (Thermocycling on Group 4). SBS(Shear bond strength) of 8 groups was determined with an Instron Universal Testing Machine. Also fractured surface of specimens were observed with a scanning electron microscope. There were no significant differences in the initial SBS between Group 1(control group), Group 3, and Group 4. (p>0.05) Group 2 presented the lowest SBS values. There was a no significant difference between just as 24hour water storage and simulated aging on pockmarked zirconia groups. (p>0.05) A formation of pockmarked irregularities on zirconia surface as mechanically pitted surface was reliable method for establishing a stronger bond between $TESCERA^{TM}$ ATL and zirconia-based material.

• Journal of Conservation Science
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• v.26 no.2
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• pp.121-132
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• 2010

The Bukjiri Maaeyeoraejwasang (National Treasure No. 201) consists of two-mica granite in medium size, which was the simbol of power in the region of the Silla period. Magnetic susceptibility of the host rock was measured as 0.41(${\times}10^{-3}$ SI unit), which has the similar range with surrounding outcrop. The Buddha developed parallel discontinuous plane of NE to SW strike and damaged seriously by exfoliation, granular disintegration and brown discoloration as 41.5%, 16.7% and 40.0%, respectively. As a result of the ultrasonic velocity, which was relatively weak values as 1,629m/s (Buddha area) and 1,549m/s (surrounding outcrop), improved about 900m/s compared to last treatment. From the results of the evaluation for slope stability, identified the possibility of toppling failure in the Buddha, and planar and wedge failure in host rock. Therefore, we suggest for the safely conservation of the Buddha, continuance monitoring for understand behavior of discontinuity system of the surface, and necessitate foundation reinforcement method for the rock which has the danger of collapse.

• Economic and Environmental Geology
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• v.40 no.5
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• pp.661-673
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• 2007

Rock materials of the three-storied stone pagoda in the Cheongryongsa temple in Korea are mainly composed of gneissose two-mica granite and fine-grained granite. This stone pagoda shows structural instability due to cracks and breaking-out of the stones. The surface properties of the stone is highly degraded by various inorganic pollutants and epilithic biospecies. Therefore, this study carried out comprehensive deterioration diagnosis by non-destructive methods, and some conservation treatments base on the diagnosis were carried out to reduce weathering progress. As the treatments, the biospecies and lichen that covering on the stone surfaces were removed by dry and wet cleaning, and degraded concrete applied to the pagoda for restoration in the past was removed and repaired with epoxy resin. Oxidized iron plates inserted between the rock properties were also substituted titanium stainless steels. After all processes are completed, we sprayed consolidant on the rock surface. Finally, the ground of the stone pagoda was rearranged using small rock aggregates, and the fence was established for control of artificial deterioration by visitors and environmental maintenance.

• Convergence Security Journal
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• v.14 no.6_1
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• pp.89-98
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• 2014

Simultaneously with the founding of the Joseon military system was reformed. On the basis of Koryo's '2gun 6wie(二軍 六衛)' reorganized into '10wie 50ryong(10衛 50領)'. But the de facto central military power was in Euhungqingunwie(義興親軍衛) that is Lee Seong-gye's Elite Guard. In addition to these make up the backbone of the central forces that were Siwiepae(侍衛牌). Also a anti-legislation Seongzhongaima(成衆愛馬) was also presented. But soon the military command and military systems will start to repair. First, reform of military command system of the unified command system shall be established for the Euhungqingunwie(義興親軍衛). And Jeongdojeon has strengthened the military education and training. But, for the establishment of Military command system the most important was the reform of the private soldier. Military systems also have been systematized. shipwie(十衛) was changed to the shipsa(十司) in Taejo. After, they are expanded to shipyisa(十二司) in Sejong. And, the Gabsa(甲士) were returned. In addition, various special branch of the army, Byelsiwie(別侍衛), Naegumewie(內禁衛), gyumsabok(兼司僕) etc, are increased and founded.