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양원석 ( Yang¸ Won-seok ) 한국어문학국제학술포럼 2008 Journal of Korean Culture Vol.11 No.-
As you know, more than 70% of Korean vocabularies are composed of Chinese characters based on coinage power of Chinese characters. To correctly and speak our national language, therefore, it can be said understanding Chinese characters is essential. This will apply the same in case a foreigner learns Korea. In Korean education targeting on foreigners, Chinese characters education is one of useful methods able to increase learning effects. Of course, some may say this mostly corresponds to learners living in the Chinese characters culture world who are already aware of Chinese characters, but, as earlier stated, because most of Korean vocabularies are composed of Chinese characters, learning Chinese characters may contribute more or less to understanding of Korean language. This paper mostly referred to the necessity of instruction in Chinese characters in relation to Korean language education. First of all, the proportion of Chinese characters used in Korean was reviewed and it was confirmed that learning Chinese characters was essential in understanding Korea. For that, the author examined 「vocabulary list for Korean learning」 provided by the National Institute of the Korean Language and the proportion of Chinese characters in Korean ability test questions. Also, it was examined how Chinese characters was being taught in Korean education giving in Korean educational institutions, home and abroad. Through this, it was confirmed that home and abroad Korean educational institutions have recognition, though not yet universal, that Chinese characters education is necessary for learning Korean and Koreanology. In the next place, the contents of Korean textbooks which utilized Chinese characters was inquired into and their features were described. The investigated textbooks say "To know Chinese characters leads to easy understanding of Chinese characters vocabularies and the meaning of many vocabularies of Chinese characters containing the same ones, so that it is greatly helpful to increasing vocabularies of Korean language. In the end, the author examined the effects obtainable in Korean education through Chinese characters education. Exact understanding of Chinese characters and Chinese language is a useful way leading to the exact understanding and good command of Korean. Especially, it can raise the learning effects from the viewpoints of learning Chinese characters vocabularies. Even if the necessity of Chinese characters in Korean education has been admitted, there may be some different opinions as to whether Chinese characters should be stressed without fail even though, in case of a student of non-Chinese characters culture, he/she must learn another language besides Korean letter(Hangeul) in a certain time. In addition, among the greatest problems, there are an error where the meaning of Chinese characters used in Korean, Chinese and Japanese is different and an error occurring by the influence of expression methods and grammar in Chinese or Japanese style. These problems will require appropriate instruction by an educator. That is, as to an error occurring by the influence of Chinese and Japanese in the process of giving Korean education, if an education is provided by well summarizing and comparing the above-mentioned matters, higher learning effects may be obtained. It is true that the necessity of Chinese characters in Korean education is not widely recognized. It is necessary to continue to study how to teach Korean through comparison of Chinese characters of Korean, Chinese and Japanese and of Chinese vocabularies.
Uniformity of Droplet of Eutectic NaCl-MgCl2 System for Corrosion Test of Coating Layer
Wonseok Lee,Wonseok Yang,Jihun Kim,Hyeongbin Kim,Taeho Jang,Sungyeol Choi 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Corrosion-related challenges remain a significant research topic in developing next-generation Molten Salt Reactors (MSRs). To gain a deeper understanding of preventing corrosion in MSRs, previous studies have attempted to improve the corrosion resistance of structural alloys by coating surfaces such as alumina coating. To conduct a corrosion test of coating alloys fully immersed in molten salt, it’s important to ensure that the coating application process is carefully carried out. Ideally, coating all sides of the alloy is necessary to avoid gaps like corners of the alloy, while only applying a one-sided coating alloy can lead to galvanic corrosion with the base metals. Using the droplet shape of eutectic salt applied to only one side of the coating alloy would avoid these problems in conventional corrosion immersion tests, as corrosion would occur solely on the coating surface. Although the droplet method for corrosion tests cannot fully replicate corrosion in the MSRs environment, it offers a valuable tool for comparing and evaluating the corrosion resistance of different coating surfaces of alloys. However, the surface area is important due to the effect of diffusion in the corrosion of alloy in molten salt environments, but it is difficult to unify in the case of droplet tests. Therefore, understanding the droplet-alloy properties and corrosion mechanism is needed to accurately predict and analyze these test systems’ behavior highlighting unity for corrosion tests of different coating surfaces of alloys. To analyze the molten salt droplet behavior on various samples, pelletized eutectic NaCl-MgCl2 was prepared as salt and W-, Mo-coating, and base SS316 as samples. At room temperature, the same mass of pelletized eutectic NaCl-MgCl2 was placed on different samples under an argon atmosphere and heated to a eutectic point of 500°C in a furnace. After every hour, the molten droplets were hardened by rapid cooling at room temperature outside the furnace. The mass loss of salts and the contact area of the samples were measured by mass balance and SEM. The shape, surface area to volume ratio, and evaporation of the droplets of NaCl-MgCl2 per each coating sample and hour were analyzed to identify the optimal mass to equalize the contact coating surface of alloys with salts. Furthermore, We also analyzed whether their results reached saturation of corrosion products through ICP-MS. This will be significant research for the uniformity of the liquid-drop shape corrosion test of the coating sample in molten eutectic salts.
Thermal NaCl-MgCl2 Salt Purification for Reducing Reactor Vessel Corrosion
Wonseok Lee,Wonseok Yang,Jihun Kim,Hyeongbin Kim,Sungyeol Choi 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
Molten chloride salts are promising candidates as a coolant for Molten Salt Reactors (MSRs) because of their low cost, high specific heat transfer, and thermal energy storage capacity. The NaCl- MgCl2 eutectic salts have enormous latent heat (430 kJ/kg) and financial advantage over other types of molten chloride salt. Despite the promise of the NaCl-MgCl2 eutectic salt, problems associated with structural material corrosion in the MSR system remain. The hygroscopicity of NaCl-MgCl2 and high MSRs operating temperature accelerate corrosion within structural alloys. Especially, MgCl2 reacts with H2O in the eutectic salt to produce HCl and Cl2, which are known to further exacerbate corrosion by the chlorination of structural materials. Therefore, several studies have worked to purify impurities associated with MgCl2, such as H2O. Thermal salt purification of NaCl-MgCl2 eutectic salt is one method that reduces HCl and Cl2 gas generation. However, MgO and MgOHCl are generated as the byproduct of thermal purification through a reaction between MgCl2 and H2O. The corrosion behavior of MgO within structural alloys after thermal treatment is not well known. This paper demonstrates corrosion behavior within structural alloy after thermal treatment at various temperature profiles of the NaCl-MgCl2 eutectic salt. According to the temperature range, MgCl2·H2O are separated at 100~200°C, and MgOHCl and HCl begin to occur at 240°C or higher. Finally, MgOHCl produces MgO and HCl at 500°C or higher temperatures. After thermal treatments, the H2O, MgOHCl, and MgO content were measured by Thermo Gravimetric Analyzer (TGA) to evaluate significant products causing corrosion. The structural materials were analyzed by the Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS) and using the mass change method to observe the type of localized corrosion, the corrosion rate, and the corrosion layer thickness. This study is possible in that it can reduce economic costs by reducing the essential use of expensive, high-purity molten salts because it is related to a substantial financial cost problem considering the amount of molten salt used in industrial sites.
최원석(Choi, Wonseok),이희영(Lee, Heeyoung),이일화(Lee, Illwha),장승엽(Jang, SeungYup),정원석(Chung, Wonseok) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.1
급속경화궤도는 기존의 자갈도상궤도를 콘크리트궤도로 대체하는 방식으로 유지⋅보수비용을 절감할 수 있는 장점을 갖고 있다. 급속경화궤도를 고속철도에 적용할 경우에는 열차하중의 증가로 인해 콘크리트에 응력이 과도하게 발생할 위험이 있다. 따라서 교량상 급속경화궤도를 적용하기 위해서는 레일과 급속경화궤도 슬래브의 거동에 대한 분석이 필요하다. 본논문에서는 유한요소해석을 통해 교량상 급속경화궤도의 레일 및 슬래브의 거동을 분석하고, 급속경화궤도 슬래브의 적합한 앵커수, 앵커설치위치, 급속경화궤도의 시공길이를 산정하는 모델을 제시한다. The existing ballasted track has problems including riding quality degradation due to disorder of track and increasing maintenance cost. To solve the aforementioned problem, Fast Hardening Track (FHT) has been developed for replacing the ballasted track. When applied to the FHT high-speed rail, the slab has a risk of stress that occurs on a concrete slab as the train load increases. Therefore, The analysis of the behavior of rails and slabs are required to apply to a bridge. This study suggests a number of appropriate anchors and anchors installation location, construction length in the FHT.