The analysis of uranium migration is crucial for the accurate safety assessment of high-level radioactive waste (HLW) repository. Previous studies showed that the migration of the uranium can be affected by various physical and chemical processes, such as groundwater flow, heat transfer, sorption/ desorption and, precipitation/dissolution. Therefore, a coupled Thermal-Hydrological-Chemical (THC) model is required to accurately simulate the uranium migration near the HLW repository. In this study, COMSOL-PHREEQC coupled model was used to simulate the uranium migration. In the model, groundwater flow, heat transfer, and non-reactive solute transport were calculated by COMSOL, and geo-chemical reaction was calculated by PHREEQC. Sorption was primarily considered as geo-chemical reaction in the model, using the concept of two-site protolysis nonelctrostatic surface complexation and cation exchange (2 SP NE SC/CE). A modified operator splitting method was used to couple the results of COMSOL and PHREEQC. Three benchmarks were done to assess the accuracy of the model: 1) 1D transport and cation exchange model, 2) cesium transport in the column experiment done by Steefel et al. (2002), and 3) the batch sorption experiment done by Fernandes et al. (2012), and Bradbury and Baeyens (2009). Three benchmark results showed reliable matching with results from the previous studies. After the validation, uranium 1D transport simulation on arbitrary porewater condition was conducted. From the results, the evolution of the uranium front with sequentially saturating sites was observed. Due to the limitation of operator splitting method, time step effect was observed, which caused the uranium to sorbed at further sites then it should. For further study, 3 main tasks were proposed. First, precipitation/ dissolution will be added to the reaction part. Second, multiphase flow will be considered instead of single phase Darcy flow. Last, the effect of redox potential will be considered.

The design of the high-level radioactive waste (HLW) repository is made for isolating the HLW from the groundwater system by using artificial and natural barriers. Granite is usually considered to be a great natural barrier for the HLW repository in various countries including Sweden, Canada, and Korea due to its low hydraulic permeability. However, many fractures that can act as conduits for groundwater and radionuclides exist in granite. Furthermore, the decay heat generated by the HLW can induce groundwater acceleration through the fracture. Since the direction, magnitude, and lasting time of the heat-induced groundwater flow can be differed depending on the fracture geometry, the effect of fracture geometry on the groundwater flow around the repository should be carefully analyzed. In this study, groundwater models were conducted with various fracture geometries to quantify the effect of various properties of fractures (or fracture networks) on the heat-induced groundwater flow. In all models, the pressure around the repository only lasted for a short period after it peaked at 0.1 years. In contrast, the temperature lasted for 10,000 years after the disposal inducing the convective groundwater flow. Single fracture models with different orientations were conducted to evaluate the variations in groundwater velocities around the repository depending on the fracture slope. According to the results, the groundwater velocity on the fracture was the fastest when the regional groundwater flow direction and the fracture direction coincided. In double fracture models, various inclined fractures were added to the horizontal fracture. Due to the intersecting, the groundwater flow velocity showed a discontinuous change at the intersecting point. Lastly, the discrete fracture network models were conducted with different fracture densities, length distributions, and orientations. According to the modeling results, the groundwater flow was significantly accelerated when the fracture network density increased, or the average fracture length increased. However, the effect of the fracture orientation was not significant compared to the other two network properties.

The aim of this study was to determine the therapeutic effects of beauty care on negative mental health, including stress and depression. Nail care, massage care, and makeup were used as programs for beauty therapy. Qualitative research was conducted with six female participants over five-month period. After interviewing the subjects in advance, beauty care treatments were performed every week 4 weeks in the following order: nail care, massage, and makeup. The results are as follows, First, the participants perceived beauty care in the form of 4 concepts: “courtesy in social life,” “investment in oneself,” “self-satisfaction,” and “self-care.” Second, the effects of beauty therapy were categorized as “psychological effects,” “confidence,” “behavioral changes,” “evaluation of others,” and “positive social effects.” Third, each subject showed different psychological effects during the process when the function of the therapy took effect through the beauty care treatment. It was confirmed that confidence levels increased as a result of treatment through the process of becoming re-aware of oneself. Positive statements from the participants included: “I want to go out,” “I have become kind and positive to others,” “I have become more active in a given task,” and “It seems that my work ability is improving.” Finally, t-test results for selfesteem, depression, and stress showed there were significant differences in self-esteem and depression. This confirmed that self- esteem increased, and depression decreased after the beauty care treatment.

The sensory stimulation of a cosmetic product has been deemed to be an ancillary aspect until a decade ago. That point of view has drastically changed on different levels in just a decade. Nowadays cosmetic formulators should unavoidably meet the needs of consumers who want sensory satisfaction, although they do not have much time for new product development. The selection of new products from candidate products largely depend on the panel of human sensory experts. As new product development cycle time decreases, the formulators wanted to find systematic tools that are required to filter candidate products into a short list. Traditional statistical analysis on most physical property tests for the products including tribology tests and rheology tests, do not give any sound foundation for filtering candidate products. In this paper, we suggest a deep learning-based analysis method to identify hand cream products by raw electric signals from tribological sliding test. We compare the result of the deep learning-based method using raw data as input with the results of several machine learning-based analysis methods using manually extracted features as input. Among them, ResNet that is a deep learning model proved to be the best method to identify hand cream used in the test. According to our search in the scientific reported papers, this is the first attempt for predicting test cosmetic product with only raw time-series friction data without any manual feature extraction. Automatic product identification capability without manually extracted features can be used to narrow down the list of the newly developed candidate products.

There is a growing research interest in language teachers’ professional identity. Nevertheless, unlike studies involving the identity of native and non-native English-speaking teachers, few studies analyzed Gyopo English teachers’ identity despite a sizeable body of Gyopo teachers in the Korean educational context. Using post-structural perspectives of identity, this case study analyzed the identities of a Gyopo instructor as an English teacher and how such identities were reflected in classroom practice. Data were collected through interviews, classroom observations, and self-reflective reports written by the participant. Findings reveal that the participant constructed multiple professional identities as a teacher with previous language learning experiences, a bridge-builder, a multitasker, and a teacher who is not a native English speaker but an American, and a replaceable person. While experiencing identity conflicts, she constantly negotiated and renegotiated her multiple, contradictory identities to position herself more favorably. Based on these findings, the present study offers pedagogical suggestions.

Unarmored dinoflagellates, in the family Kareniaceae, include harmful or toxic bloom-forming species, which are associated with massive fish kills and mortalities of marine organisms worldwide. The occurrence and distribution of the toxigenic species in the family Kareniaceae were investigated in the brackish and coastal waters of Korea between July 2018 and October 2020. During the survey, we collected seven newly recorded species; Karenia papilionacea, Karlodinium digitatum, Karl. veneficum, Karl. zhouanum, Takayama acrotrocha, T. helix, and T. tasmanica. A total of fifteen strains of the seven taxa were successfully established as clonal cultures and examined using LM, SEM, and molecular phylogeny inferred from LSU rDNA sequences. Herein, we present the taxonomic information, morphological features, and molecular phylogenetic positions of the unrecorded dinoflagellate species collected from Korean coastal waters.

본 연구에서는 국내 및 국제 화훼장식 자격증 취득 여부에 따른 화훼장식 자격증에 대한 인식을 알아보고 국내 화훼장식 자격증의 활용방안을 모색하고자 화훼장식 자격증 취득자 100명과 미취득자(일반인) 210명, 총 310명을 대상으로 설문을 진행하였다. 화훼장식 자격증 선호도 조사에서는 화훼장식기사(3.27)와 화훼장식기능사(3.13)에 대한 선호도가 가장 높았으며, 자격증 선호 이유로는 자격증이 주는 자신감(3.56)과 다양한 실무에서의 활용(3.43)이 가장 큰 이유로 나타났다. 반면, 자격증 취득 여부와 상관없이 국내 화훼장식 민간자격증 에 대한 선호도는 가장 낮았으며, 특히 자격증 취득자의 선호도가 미취득자에 비해 더 낮았다. 화훼장식 자격증 취득자가 보유하고 있는 자격증에 대한 만족도는 국제 화훼장식 자격증 (3.70)이 국내 화훼장식 자격증(3.03)보다 높았으며, 특히 미국 화훼장식 민간자격증(4.03)에 대한 만족도가 가장 높았다. 반면, 국내 화훼장식 민간자격증 보유자는 많았으나 본 자격 증 만족도는 보통 이하로 낮은 수준이었다. 자격증 취득의 만족 이유로는 해당 자격증이 능력개발 및 전문성에 도움을 주며(3.61), 자격증이 주는 신뢰도(3.45), 실무에 도움(3.41)을 제공하기 때문에 만족하는 것으로 나타났다. 화훼장식 자격증 별 신뢰도에서는 자격증 취득 여부와 상관없이 국내 화훼장식 민간자격증(2.80)을 제외한 모든 자격증을 신뢰하는 것으로 나타났으며, 특히 국내 화훼장식기사(3.44)는 유럽, 일본과 한국의 민간자격증에 비해 신뢰도가 높은 것으로 나타났다. 국내 화훼장식 자격증의 발전 방향을 살펴본 결과, 자격증 취득 여부와 상관없이 취업과 실무와의 연계, 실기 심사에 대한 공정성, 시험 및 평가방식의 강화 등이 자격증 발전에 필요한 요인으로 인식하고 있었다. 또한, 자격증 취득 시험 출제 기준 및 자격증 취득 후 국가적 복지혜택에 대한 보완이 바람직한 화훼 장식 자격증 제도의 정착을 위해 필요한 사항으로 나타났다.