• The Journal of Advanced Prosthodontics
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• v.10 no.4
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• pp.291-299
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• 2018

PURPOSE. To assess the degree of conversion (DC) and light irradiance delivered to light-cured and dual-cured cements by application of different light sources through various types of monolithic computer-aided design and computer-aided manufacturing (CAD/CAM) materials. MATERIALS AND METHODS. RelyX Ultimate Clicker light-cured and dual-cured resin cement specimens with 1.5-mm thicknesses (n=300, 10/group), were placed under four types of crystalline core structure (Vita Enamic, Vita Suprinity, GC Ceresmart, Degudent Prettau Anterior). The specimens were irradiated for 40 seconds with an LED Soft-Start or pulse-delay unit or 20 seconds with a QTH unit. DC ratios were determined by using Fourier transform infrared spectroscopy (FTIR) after curing the specimen at 1 day and 1 month. The data were analyzed using the Mann-Whitney U test (for paired comparison) and the Kruskal-Wallis H test (for multiple comparison), with a significance level of P<.05. RESULTS. DC values were the highest for RelyX Ultimate Clicker light-cure specimens polymerized with the LED Soft-Start unit. The combination of the Vita Suprinity disc and RelyX Ultimate Clicker dual-cure resin cement yielded significantly higher values at both timepoints with all light units (all, P<.05). CONCLUSION. Within the limitations of this study, we conclude that the DC of RelyX Ultimate Clicker dual-cure resin cement was improved significantly by the use of Vita Suprinity and the LED Soft-Start light unit. We strongly recommend the combined use of an LED light unit and dual-cure luting cement for monolithic ceramic restorations.

• Journal of Korea Game Society
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• v.12 no.6
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• pp.131-144
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• 2012

To affect users' attitudes on social issues, some serious games use narrative which can be an effective tool to provoke users' emotions. In this paper, focus group interview on the experiences about playing was conducted to figure out if the parts of narratives containing educational goals can actually provoke certain emotions or not. From the interview, words having emotional meaning were extracted and matched with Korean Emotion Terms Database. Then the emotion terms were compared with Russell's schematic map of core affect and were categorized. The result showed that users mostly felt unpleasant emotions during the play. The unpleasant emotions helped to achieve the game's goal which is conveying the tragedy of war.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.43.3-43.3
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• 2017

NGC 6822 is a dwarf irregular galaxy in the Local Group and it is located in 500 kpc, further than the Large Magellanic Cloud and the Small Magellanic Cloud. Therefore, we can study star-forming processes by local condition in NGC 6822 instead of tidal force of the Galactic gravitational field. Hubble V is the brightest of several H II complexes in this galaxy. We observed Hubble V by using IGRINS attached on the 2.7 m telescope at the McDonald Observatory in Texas, US in May 2016. We performed a spectral mapping of $15^{{\prime}{\prime}}{\times} 7^{{\prime}{\prime}}$area on H and K bands, and detected emission lines of bright $Br{\gamma}\;{\lambda}2.1661{\mu}m$ and weak He I ${\lambda}2.0587{\mu}m$. Molecular hydrogen lines of 1-0S(1) ${\lambda}2.1218{\mu}m$, 2-1 S(1) ${\lambda}2.2477{\mu}m$, and 1-0 S(0) ${\lambda}2.2227{\mu}m$ was also detected. These emission lines show the structure of an ionized core and excited surface of clouds by far-ultraviolet photons, photodissociation region (PDR). We present three-dimensional maps of emission line distributions through multi slit scanning data and compare these results with the previous study. This presentation shows the physical structure of the star-forming regions and we discuss a PDR model and an evolution of Hubble V complex.

• The Journal of Korean Medical History
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• v.24 no.2
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• pp.57-67
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• 2011

The headache has various causes and symptoms in clinic. Therefore The headache and the stiff neck also can found in many articles of Shanghanlun(傷寒論) On Cold Damage. In the past, many doctors classified the headache and the stiff neck according to their own theories, and published some Shanghan books(傷寒書). In this study, I select ten Shanghan books which classified the headache and the stiff neck in table of contents, and compared with the articles of and , the first books of Shanghanlun(傷寒論) to found meanings of them. As a result, the Osuyutang(吳茱萸湯) was the most quoted herb medicine of . The second was Jowisunggitang(調胃承氣湯) and Sosunggitang(小承氣湯), the group of Sunggitang(承氣湯類). Mahwangtang(麻黃湯) and Gyejitang(桂枝湯) are substituted as Ganghwalchunghwatang(羌活沖和湯) in for simply prescribe medicine, or even not mentioned as in . This can be understand as a result of copy the previous generation doctor's writings, not as a study of and . The articles of the headache in was not quoted in that ten books. But the stiff neck was frequently quoted that Gyejigualutang(桂枝加括蔞湯), Dehamhyungtanghwan(大陷胸湯丸) articles includes chibyong(痓病) The Opisthotonos, gyongbyong(痙病) The Convulsions, Yuchi(柔痓) Opisthotonos With Sweat And Fever.

• Korean Journal of Poultry Science
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• v.35 no.1
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• pp.39-55
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• 2008

Like the other herpesviruses, the virion of MDV consists of an envelope, which surrounds an amorphous tegument. Within the tegument, and icosahedral capsid encloses a linear double-stranded DNA core. Although the genome structure of MDV indicates that it is an ${\alpha}-herpesvirus$ like herpes simplex and varicella-zoster viruses, biological properties indicate MDV is more akin to the ${\gamma}-herpesvirus$ group, which includes Epstein-Barr and Kaposi's sarcoma herpesviruses. These herpesviruses replicate lytically in lymphocytes, epithelial and fibroblastic cells, and persist in lymphoblastoid cells. MDV has a complex life cycle and uses two means of replication, productive and non-productive, to exist and propagate. The method of reproduction changes according to a defined pattern depending on changes in virus-cell interactions at different stages of the disease, and in different tissues. Productive (lytic) interactions involve active invasion and take-over of the host cell, resulting in the production of infectious progeny virions. However, some herpesviruses, including MDV, can also establish a non-productive (abortive) infection in certain cell types, resulting in production of cell-associated progeny virus. Non-productive interactions represent persistent infection, in which the viral genome is present but gene expression is limited, there is no structural or regulatory gene translation, no replication, no release of progeny virions and no cell death. Reactivation of the virus is rare, and usually the infectious virus can be re-isolated only after cultivation in vitro. MDV establishes latency in lymphoid cells, some of which are subsequently transformed. In this review article, recent knowledges of the pathogenesis mechanisms followed by MDV infection to sensitive cells and chickens are discussed precisely.

• 한국터널공학회:학술대회논문집
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• 2005.04a
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• pp.348-358
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• 2005

Although the evaluation of the mechanical properties and behavior of discontinuous rock masses is very important for the design of underground openings, it has always been considered the most difficult problem. One of the difficulties in describing the rock mass behavior is assigning the appropriate constitutive model. This limitation may be overcome with the progress in discrete element software such as PFC, which does not need the user to prescribe a constitutive model for rock mass. Instead, the micro-scale properties of the intact rock and joints are defined and the macro-scale response results from those properties and the geometry of the problem. In this paper, a $30m{\times}30m{\times}30m$ jointed rock mass of road tunnel site was analyzed. A discrete fracture network was developed from the joint geometry obtained from core logging and surface survey. Using the discontinuities geometry from the DFN model, PFC simulations were carried out, starting with the intact rock and systematically adding the joints and the stress-strain response was recorded for each case. With the stress-strain response curves, the mechanical properties of discontinuous rock masses were determined and compared to the results of empirical methods such as RMR, Q and GSI. The values of Young's modulus, Poisson's ratio and peak strength are almost similar from PFC model and Empirical methods. As expected, the presence of joints had a pronounced effect on mechanical properties of the rock mass. More importantly, the mechanical response of the PFC model was not determined by a user specified constitutive model.

• Journal of Digital Convergence
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• v.18 no.5
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• pp.279-285
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• 2020

Purpose :This study intends to test the effects of Problem-based learning on critical thinking disposition, academic self-efficacy and self-leadership for undergraduate nursing students. Methods: A one group pre-post design was applied to four diagnostic test and nursing for 4 times(eight hours) of 26 nursing students. Data were collected between August 29 and December 10, 2019. Data were analyzed by frequencies, Kolmogorov-Smirnov, paried t-test, Wilcoxon signed-rank test using SPSS/WIN 23.0. Results: Problem-based learning was significantly increasing critical thinking disposition(t=-2.16, p=.041) and Academic self-efficacy(z=-2.36, p=.018), but self-efficacy(t=-.16, p=.875) was no significantly. Conclusion: Based on this study, it is suggested that nursing students should develop their core competency by applying problem-based learning to various subject

• Journal of the Korean Society of School Health
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• v.29 no.3
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• pp.310-317
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• 2016

Purpose: This descriptive research was carried out to identify how high school students' attitude to death and their meaning of life were affected by hospice volunteering and death education. Methods: This study is based on a structured questionnaire designed for 180 high school students who were given death education while doing volunteer work at non-profit hospice hospitals and another 288 high school students not doing any hospice volunteer work. The collected data was processed by the SPSS 20.0 program and then analyzed by $x^2$ test, t-test and ANOVA test. Results: High school students' attitude to death and their meaning of life showed significant differences depending on whether or not they had volunteered at hospice hospitals. The group with hospice volunteering experience tended to be more negative about death and have a higher meaning of life compared to those without hospice volunteering experience. Students with proper hospice recognition made up 52.4%, those who expressed hopes to receive hospice-care themselves if necessary accounted for 70.5%, and those who said they would like to take care of their family members either at home or at a hospice center if any of them got incurably sick comprised 59.0%. Those who thought dignified death is to be with one's family or any other meaningful person were 47.6% and 18.5% of the students thought that 'thinking they had led a meaningful life' was the core of a dignified death. Conclusion: Given the above results, it became clear that hospice volunteering and death education can affect high school students' meaning of life and their attitudes toward death.

• Journal of Information Technology Applications and Management
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• v.25 no.1
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• pp.1-17
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• 2018

This study presents a research model that demonstrates the dominant design technology strategy for developing and securing dominant design technology based on open innovation. For this purpose, this study developed a strategic model for the development and acquisition of design technology, production technology, and production system of propeller which satisfies the requirements of ship propulsion system required by ship owners and shipbuilders. By studying large propellers for ships, it is possible to embody a strategic model that can be used as a technology development strategy of dominant design that is effective in technology field of other industries. In this study, HSP (High Skewed Propeller) strategy of Hyundai Heavy Industries, which occupies the largest global market share (47.5%, 2007) for more than 30 years until now, is analyzed as a successful case to verify this strategic model. The development and acquisition strategy model of dominant design technology presented in this study consists of four stages : dominant design project strategy, dominant design engineering technology strategy, dominant design production technology strategy, and dominant design production system strategy. The strategic model summarizes the key activities at each stage. In addition, the steps and core activities of this strategic model were confirmed through the case study. As a technology development strategy of HSP products, Hyundai Heavy Industries utilized open innovation technology to cooperate with outside, that is, collaborative research and development with KAIST (Korea Advanced Institute of Science and Technology) research team, and succeeded in achieving technology development of dominant design of HSP products by linking it with HSP technology development and acquisition strategy.

• Journal of Environmental Science International
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• v.4 no.5
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• pp.103-103
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• 1995

In the Chinhae Bay, Korea, sedimentation rates and sedimentary record of anthropogenic metal loads were determined by $^{210}Pb$ dating and heavy metal analysis of four sediment cores . The sedimentation rates varied from 0.16g/$cm^2$/yr(3.1mm/yr) at Sta. Ct, located within narrow waterway to 0.24g/$cm^2$/yr(4.8mm/yr) at Sta. Cl, located in Haengam Bay. Maximum contents of Mn, Zn, Cu and Cr were observed at Sta. C2 located near the mouth of Masan Bay, while minimum contents were observed at Sta. CB. Mn/Fe ratios at Sta. C2 and Sta. C4 showed gradually increasing and decreasing downward, respectively, in the upper layer of sediment cores. This suggests that Mn may be diagenetically redistributed in highly reduced environment. At Sta. C2, the concentrations of Zn and Cu began to increase from 1920s by anthropogenic input and have been remarkablely increasing since mid 1960s. At Sta. C3, located near Sungpo, anthropogenic input of these two elements has also slightly increased after 1970s. However, pollution of these two elements was not significant in Haengam Bay(Sta. Cl) and Chiljun watenway(Sta. C4). The pollution of Co, Ni and Cr was not remarkable in all core samples except surface sediment of Sta. C2. The total input of anthropogenic Zn and Cu since 1920s was estimated to be 28∼792 ㎍/cm2 and 0∼168㎍/cm2, respectively. Sta. C2 showed remarkablely higher values relative to other stations: anthropogenic loads of Zn and Cu constituted 27% and 29% of the total sedimentary inventories at the present day, respectively. Fe, Ni, Cr and Co contents showed good correlation(r>0.8) with each other. Anthropogenic Zn and Cu also showed a very good positive correlation(>0.9). However, correlation between these two group of element was quite scattered, indicating different sources and geochemical behaviors.