• Journal of Science Education
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• v.44 no.3
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• pp.273-288
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• 2020

This study aims to investigate the presentation of the Nature of Science (NOS) in integrated science textbooks of the 2015 revised curriculum. The five integrated science textbooks published by the revised 2015 curriculum were analyzed with the conceptual framework of the four themes of the Nature of Science (NOS) (Lee, 2013) based on scientific literacy. The four themes of the NOS are 1. nature of scientific knowledge (theme I), 2. nature of scientific inquiry (theme II), 3. nature of scientific thinking (theme III), and 4. nature of interactions among science, technology, and society. The reliability of the textbooks analysis was measured between two coders by the Cohen's kappa and resulted in between 0,83 and 0,96, which means the results of analysis was consistent and reliable. The findings were as follows. First, overall theme II, nature of scientific inquiry emphasized on the integrated science textbooks of the 2015 revised curriculum by devoting the contents over 40 % in the all five publishing companies' textbooks. Second, while the theme II, nature of scientific inquiry was emphasized on the textbooks regardless of the publishing companies, other themes of the NOS were emphasized in different portions by the publishing companies. Thus, the focus among other three themes of the NOS was presented differently by the publishing companies except that in theme II, nature of scientific inquiry was most emphasized on integrated science textbooks. Third, the presentation of the NOS was identified similarly across the topics of integrated science textbooks except on topic 4. Environment and Energy. The theme IV, nature of interactions among science, technology, and society was emphasized reasonably only in the topic of Environment and Energy of the textbooks. Finally, the presentation of the NOS in the integrated science textbooks of the 2015 revised curriculum were more balanced among the four themes of the NOS with focus on the scientific inquiry compared to the previous curriculum textbooks.

• Journal of Korean Society of Forest Science
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• v.100 no.2
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• pp.226-231
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• 2011

Ulmus davidiana var. japonica is a deciduous tree species used for traditional medicine. This study was conducted to investigate the variation of samara, seed, germination and growth characteristics among populations and among individuals within five natural populations of U. davidiana var. japonica distributed in Korea. The ten characteristics of samara and seed, the three germination behaviors as well as the two growth traits were studied in samaras collected from total 32 trees. Statistical analysis of all characteristics showed that there were significant differences among populations as well as among individuals within populations. In this study, the mean characteristics of this species were 13.0 mm in samara length, 9.7 mm in samara width, 1.37 in samara index, 0.015 g in samara weight, 3.07 mm in samara stalk length, 3.85 seed length, 2.66 mm in seed width, 1.46 in seed index, 1.29 mm seed thickness, 0.0062 g in seed weigh, 34.8% in germination percentage, 8.6 days in mean germination time, 3.5 ea./day in gemination rate, 37.7 cm in height and 4.90 mm in root collar diameter. Especially, coefficients of variations in samara weight, germination percentage, germination rate, height and root collar diameter were relatively high (${\geq}30.0%$) compared to other traits. There was no significant relationship between population association and geographical distribution. The results of principal component analysis for 15 characteristics showed that primary four principal components (PC's) explained 100% of the total variation. The first PC accounted for 41.8% of the variability which correlated with morphological traits, the second PC accounted for 32.9% of the variability which correlated with germination behaviors and the third PC accounted for 16.3% of the variability which correlated with growth traits.

• Journal of Legislation Research
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• no.55
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• pp.95-136
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• 2018

Marriage forms a minimal social unit. Marriage can affect not only relative relationship but also possession of property. Regarding legal issues related to marriage, mainly the civil law, especially the family law section, regulates. However, marriage has also a significant legal effect in terms of taxation. This article deals with the taxation of gift tax among them. In Korea, if you give more than 600 million won in assets to your husband and wife, the donee must pay the gift tax. However, there has been little research into the influence of the marital property system on the taxation of gift tax on the donation between married couples. There are two legislative approaches to the attribution of property held by married couples. The one is separate property system, the other is community property system. Under separate property system, husband and wife own property separately. The community property system recognizes marital property of married couple as a common property of married couple. The legal property system in Korea is separate property system. However, married couples can adopt the community property system as a marital property system by their agreement. Currently, most Korean couples are subject to separate property system as a marital property system. There is no legal problem to levy the gift tax on the donation between couples who are subject to separate property system. The problem is the donation of asset between couples who are subject to the community property system. In community property system, most property acquired during marriage (except for gifts or inheritances) is considered community property. community property means property owned jointly by both partners. Some argue that the gift tax can not be taxed between married couples who are subject to the community property system. In this paper, we examine whether these arguments are valid.

• Korean Journal of Environment and Ecology
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• v.35 no.3
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• pp.223-236
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• 2021

This study aims to provide basic data for the systematic conservation and efficient management of forest ecosystems by analyzing changes in understory vegetation of temperate broad-leaved deciduous forests. One-hectare permanent survey plot, consisting of 100 subplots sized 10 × 10 meters, was installed in Gwangneung forest in Pocheon, Gyeonggi-do in 2003. The state of stands and the understory vegetation in the permanent survey plot were examined at a 5-year interval from 2003 to 2018. The vascular plants found in the survey area were 56 families, 128 genera, 176 species, 18 variants, 4 varieties, and 1 subspecies, for a total of 199 taxa. The number of species in both the shrub layer and the herbaceous layer showed a tendency to decrease with time. The MRPP-tests showed a significantly differing species composition of the shrub layer in all years except 2008-2013, whereas significant differences were found in all years concerning the herbaceous layer. As for the average importance value, Euonymus oxyphyllus (18.23%), Acer pseudosieboldianum (16.48%), and Callicarpa japonica (13.85%) were dominant in the shrub layer, while Ainsliaea acerifolia (23.41%), Disporum smilacinum (9.45%), and Oplismenus undulatifolius (5.62%) were dominant in the herbaceous layer. In the shrub layer, the richness of Smilax china, Lonicera subsessilis, and Philadelphus schrenkii was high when the basal area and the stand density of an upper layer were high. By contrast, smaller basal area and stand density were associated with the richness of Acer pseudosieboldianum, Deutzia glabrata, Morus bombycis, and Cornus kousa. Furthermore, it was found out that the impact of the basal area and the stand density on the herbaceous layer decreased over time, while the herb layer's species composition was greatly affected by cover degrees of Euonymus oxyphyllus and Acer pseudosieboldianum in the shrub layer. In conclusion, the number of species in the understory vegetation in Gwangneung forest is continuously decreasing, thus implying that species diversity, basal area, and stand density of an upper layer can influence the species composition in understory vegetation.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.46 no.4
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• pp.319-327
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• 2020

Particulate matters (PM) are small particulate pollution that decrease the function of skin barrier, which causes inflammatory skin diseases and extrinsic aging. In this study, we evaluated the effect of preventing the adherence of PMs from several cosmetic products applied to human skin using iron oxide black. The PM floating chamber consists of skin exposure area, PM inlet, floating power device, and an outlet so that PM can be naturally attached to the skin while floating in the chamber. The change in skin brightness according to the floating concentration of alternative fine dust was checked to confirm the optimal floating concentration conditions. The intensity difference (before-after intensity, Δ) before and after adhesion of iron oxide black was proportional to the amount of PM adhered. The anti-adherence effect of iron oxide black on five cosmetic products were evaluated through 20 each subjects by comparing the amount of iron oxide black adhered on the control and treatment. The difference in brightness before and after the iron oxide black attached to the skin was calculated and compared with the control group(p < 0.05). When over 150 mg of iron oxide black was adhered on the skin, the interference of intensity was low and clearly showed the skin adhered pattern. According to the application of the five cosmetics, the intensity difference was significantly lower than the control group. This means that depending on the product, it prevented the attachment of iron oxide black. This study is a safe and useful method to confirm the prevention of PM skin adherence. In conclusion, cosmetics can prevent the adherence of PM on the skin according to the formulation or ingredients characteristics.

• Journal of Korea Water Resources Association
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• v.55 no.1
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• pp.1-10
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• 2022

Irrigation water supplied to the paddy field is consumed in the amount of evapotranspiration, underground infiltration, and natural and artificial drainage from the paddy field. Irrigation return flow is defined as the excess of irrigation water that is not consumed by evapotranspiration and crop, and which returns to an aquifer by infiltration or drainage. The research on estimating the return flow play an important part in water circulation management of agricultural watershed. However, the return flow rate calculations are needs because the result of calculating return flow is different depending on irrigation channel water loss, analysis methods, and local characteristics. In this study, the irrigation return flow rate of agricultural watershed was estimated using the monitoring and SWMM (Storm Water Management Model) modeling from 2017 to 2020 for the Heungeop reservoir located in Wonju, Gangwon-do. SWMM modeling was performed by weather data and observation data, water of supply and drainage were estimated as the result of SWMM model analysis. The applicability of the SWMM model was verified using RMSE and R-square values. The result of analysis from 2017 to 2020, the average annual quick return flow rate was 53.1%. Based on these results, the analysis of water circulation characteristics can perform, it can be provided as basic data for integrated water management.

• The Korean Journal of Nuclear Medicine Technology
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• v.25 no.2
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• pp.41-47
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• 2021

Purpose There are many cyclotrons compared to the land area of the Republic of Korea. Because GMP certification is required and the nuclear medicine test does not apply for insurance, the number of examinations for nuclear medicine is decreasing. Therefore, there is a high probability of early decommissioning of the cyclotron. However, we do not unusually perform the radioactivation evaluation on concrete that can be classified as radioactive waste during the decommissioning of the cyclotron. In this study, we aim to confirm the radioactivation in the concrete surface using Handheld Radionuclide Identification Devices (RIDs). Materials and Methods Because there is no cyclotron being decommissioning in the Republic of Korea, it was impossible to perform the coring of concrete for radioactivation analysis. In this study, we used the KIRAMS-13 and analyzed the concrete surface in the target direction in the cyclotron room. After setting the target direction as the center, radionuclides were measured for about five months at thirty points with vertical and horizontal intervals of 30 cm. We used the RIIDEye(Detector: NaI(Tl) detector, manufacturer: Thermo) in this study and set the measurement time per point to one day (24 hours). Results Co-60 and Cs-137 were detected in some measurement points, and we confirmed the radioactivity of Co-60 detected at the most points. As a result, we found that the radioactivity of Co-60 was high in the diagonal direction (from the lower-left direction to the upper right direction) based on the center of the target. However, we think it is impossible to apply the corresponding results to all cyclotrons because we performed the study using only one cyclotron. Conclusion In thirty measurement points, we could confirm the radioactive nuclides and the relative radioactivity using the results of portable nuclides analyzer. Therefore, we expect that we can use the portable nuclides analyzer to select the coring position of concrete during the decommissioning of the cyclotron. Also, if we secure the radioactivation data for several years, we expect to make a more accurate estimate of radioactive waste during the preparation period of decommissioning of the cyclotron.

• Korean Journal of Heritage: History & Science
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• v.55 no.1
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• pp.199-222
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• 2022

It has been 100 years since the excavation of Geumgwanchong (Gold Crown Tomb), a tomb that was accidentally discovered in Noseo-ri, Gyeongju at the end of September 1921 during Japanese colonial rule. Although it is known for its discovery, not only in the Korean Peninsula but also in Asia and beyond, the excavation report was published in Japanese and English by the Government-General of Korea in 1924 and 1928, three years after the excavation. TOMB "KINKANTSUKA" or THE GOLD CROWN TOMB at KEISHU, AND ITS TREASURES) was published as a series of books and picture books. The excavation report was prepared by Kosaku Hamada (濱田耕作), who was a member of the Ruins Investigation Committee of the Japanese Government-General of Korea (later became the President of Kyoto Imperial University, Kyoto, Japan), and Sueji Umehara (梅原末治), who was commissioned to investigate the remains of the Japanese Government-General of Korea. In this paper, the preface was written in July 1922, about half a year after the excavation of tombs, which was much earlier than the official reports, in the 'Korean and Chinese reading book (稿本 高等朝鮮語及漢文讀本 巻五)' by Hamada Kosaku (濱田耕作) for high school students in Korea, which was titled 'New Excavated Artifacts in Gyeongju (慶州의 新發掘品)' with a subtitle '絶大의 發見', a slightly awkward expression in Korean, but it means 'a very big discovery'. The meaning has been introduced as a single unit, emphasizing its significance in terms of the achievements of the excavation of Geumgwanchong, academic and archaeological discoveries, and cultural history in Korean language rather than Japanese language. Since the manuscript was written immediately after the excavation, the excitement as an archaeological researcher at the time of the excavation and expectations for future research can be read as it is. In this paper, I would like to introduce the voice of the excited field leader of the Japanese Government-General of Korea after the excavation of Geumgwanchong in 2022, the 100th anniversary of the writing. In addition, the process from the discovery of the tomb to the preparation of the report was summarized in one chronological table to make it easier to understand the series of flows.

• Journal of the Daesoon Academy of Sciences
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• v.38
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• pp.83-114
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• 2021

This paper identifies what the theoretical similarities and differences are in the concept of Sangsaeng held by Zhuxi (1130~1200) and Jeungsan (1871~1909). Human beings cannot live alone. For humans to survive, they must live with others. However, humans have an infinite desire not only for survival but also for material things, honor, and power. In other words, humans, on the one hand, seek harmony and symbiosis for survival, and on the other, constantly confront, conflict and compete with one another to satisfy their infinite desires. Thus, human-to-human interrelationship is not a co-prosperity that creates partnerships for harmony but one of adversaries within competition that must be fought and defeated. At the same time, humans can achieve harmony and cooperation by overcoming their infinite desires and realizing morality. Therefore, various social problems that originate from competitive structure, which are dominated by confrontation and conflict, can be solved through human effort and reflection, so that humans can focus on solving social problems by mobilizing their own wisdom. Jeungsan emphasized Sangsaeng as mutual beneficence and it became one of the creeds of Daesoon Thought. In the Neo-Confucianism of Zhuxi, there is an ideology of Sangsaeng as co-prosperity and this is comparable to mutual beneficence in Daesoon Thought. In Zhuxi's terminology it is called 'In (仁), humanity.' In Neo-Confucianism, a harmonious world is achieved by loving people and caring for and nurturing all things when the principles of humanity are realized. This means that when the principle of co-prosperity is realized in Daesoon Thought, there will be no conflict or grudges, and only an acquired vision of reconciliation and mutual beneficence will be achieved. Zhuxi also emphasizes the realization of humanity (cheonli) by eliminating self-interest. At this time, the relationship between humanity and 'self-interest' is similar to the relationship between the mutual beneficence and grievances in Daesoon Thought. Just as the principle of 'In' fosters love among people and the benefit of things immediately after self-interest is removed, the principle of mutual beneficence is realized immediately after grudges are resolved. This achieves an endless of paradise on earth.

• Korean Journal of Environment and Ecology
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• v.36 no.2
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• pp.118-138
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• 2022

This study was conducted to identify the vegetation structure of major vegetation by region and elevation in the subalpine zone of Seoraksan National Park and prepare an inventory of flora. We reviewed the results of the previous subalpine studies and, through a preliminary survey, determined that the first appearance point of subalpine vegetation was about 800 m based on the south. Then we conducted a site survey by installing a total of 77 plots, including 12 plots on the northern Baekdamsa-Madeungnyeong trail (BD), 13 plots on the west Hangyeryeong-Kkeutcheong trail (HG), 13 plots on the east side of Sinheungsa-Socheongbong trail (SA), and 39 plots in the southern Osaek-Kkeutcheong, Osaek-Daecheongbong trail (OS), in an interval of 50 m above sea level. The analysis classified 7 communities, including Qercus mongolica-Abies holophylla-Acer pseudosieboldianumcommunity, Q. mongolica-Tilia amurensiscommunity, Q. mongolica-Pinus koraiensiscommunity, Q. mongolica-A. pseudosieboldianumcommunity, Betula ermanii-A. nephrolepiscommunity, P. koraiensis-A. nephrolepiscommunity, and mixed deciduous broad-leaf tree community according to the species composition based on the appearance of the major subalpine plants such as Quercus mongolica, Betula ermanii, and Abies nephrolepis, region, and elevation. 10.68±2.98 species appeared per plot (100 m²), and 110.87±63.89 individuals were identified. The species diversity analysis showed that the subalpine vegetation community of Seoraksan National Park was a mixed forest in which various species appeared as important species. Although there was a difference in the initial elevation for the appearance of major subalpine plants by region, they were distributed intensively in the elevation range of 1,100 to 1,300 m. In the Seoraksan National Park, 322 taxa, 83 families, 193 genera, 196 species, 1 subspecies, 26 varieties, and 4 forms of vascular plants were identified. One taxon of Trientalis europaeavar.arcticawas identified as the protected species. The endemic plants were 19 taxa, and 58 taxa were identified as subalpine plants.