• Journal of Korean Society of Archives and Records Management
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• v.13 no.1
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• pp.135-158
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• 2013

While academic discussions and methodological researches on oral history are being progressed in Korea, its exploitation has already begun to increase with a variety of methods and approaches in the private sector. Oral history is a new method of research, as well as another process of production of archives. In order to make valuable and highly qualified archives of oral history with the application of the aforementioned conditions and characteristics, its recognition, environment, process, and method should be improved and developed. From this point of view, it is regarded as reasonable that oral history is recognized as a part of the strategy for documentation. Oral history should be produced based on common sense and reasonable judgment, applying empirical know-how rather than logic or principles because it holds a great number of characteristics, which include variable elements in the field of oral history. In addition, its process or documentation methods should be improved and developed, giving consideration to thorough exploitation. The promotion or revitalization of oral history is a signal that announces the advent of new archives and the new subjects of history at the same time. Endeavors to produce highly efficient archives of oral history are expected to be continued with the complex accumulation of empirical assets achieved at academic discussions and its fields.

• Analytical Science and Technology
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• v.28 no.3
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• pp.160-167
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• 2015

This study aims to develop a new analytical method to detect zinc pyrithione, the ingredient of cosmetics appointed as restricted ingredients and used as preservatives.. The analytical method was based on data gathered from the relevant literature. Information about the amounts of these ingredients was researched in order to select the base-matrix materials used to validate the analytical method. After selecting and preparing the base-matrix materials, the analytical method was validated by method validation procedures. The analytical method was verified first by inter-laboratory validation and then through analyzing the cosmetics sold in the market. Based on the results of this study, guidelines are proposed for the analysis of restricted ingredients in cosmetics, which will provide a method to test the cosmetics circulating in the Korean market. The use of the proposed guidelines will increase the quality of the cosmetics as well as the safety of human health, which will enhance the competitiveness of the Korean cosmetics industry and lead to an increase in the exportation of cosmetics.

• Analytical Science and Technology
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• v.26 no.6
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• pp.387-394
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• 2013

We aim to unveil dietary history recorded in Neolithic human bone from Janghang site at Gadeok Island, Busan. Excavation of Janghang site at Gadeok Island from 2010 to 2011 is an outstanding discovery in Korean Neolithic archaeology. A large number of human bones (48 individuals) were found at Janghang site, which is the largest-scale Neolithic cemetery in Korea. We extracted human bone collagen from 10 individuals and stable carbon and nitrogen isotope analysis were carried out using carbon and nitrogen analyzer connected to a continuous-flow isotope-ratio-monitoring mass-spectrometer. Although bone histological analysis shows poor preservation state, stable isotope results correspond well with bone collagen quality indicator, which implies that bone collagen reflects lifetime signature. Stable carbon and nitrogen isotope result indicates highly marinebased diet(${\delta}^{13}$C=$-14.5{\pm}1.3$‰, ${\delta}^{15}$N=$-17.4{\pm}1.7$‰, n=10), however the possible input of terrestrial animal and wild plant cannot be excluded. Our isotopic findings provide an invaluable information on Neolithic subsistence economy in this coastal area. In addition, Janghang site shows specific features in burial methods and burial goods. Two different burial methods of arranging bodies are found with extended burial type and particularly high ratio of flexed burial type. There are also burial goods such as pottery. However, there are no significant isotopic differences according to burial methods and burial goods. Although this is a preliminary study on this site, our research will provide important clues in understanding isotopic dietary history of Korean Neolithic people.

• Horticultural Science & Technology
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• v.32 no.1
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• pp.84-90
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• 2014

Berchemia racemosa var. magna is only found in Anmyeon Island of South Korea. Genetic diversity and the spatial genetic structure of B. racemosa var. magna in Anmyeon Island were studied by I-SSR marker system. Fifty I-SSR amplicons were produced from 8 selected primers. We used 13 polymorphic markers to analyze the genetic structure. Distribution of 39 individuals in the study plot($90m{\times}70m$) showed aggregate pattern (aggregation index = 0.706). Total 21 genets were observed from 39 individuals through I-SSR genotyping. Proportion of distinguishable genotype (G/N), genotype diversity (D) and genotype evenness (E) were 53.8%, 0.966 and 0.946, respectively. In spite of the small number and the narrow distribution, Shannon's diversity index (I = 0.598) was relatively high as compared with those of the other plant species. For ex situ genetic conservation of B. racemosa var. magna, the sampling strategy based on spatial autocorrelation using Tanimoto distance is efficient at choosing the conserved individuals with a 6 meter interval between individual trees.

• Journal of dental hygiene science
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• v.6 no.3
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• pp.153-158
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• 2006

Bleaching of vital and nonvital teeth is becoming a more commonly used treatment in the dental office and at home. To improve appearance and remove discoloration, the teeth of specific patients are treated with a variety of bleaching agents. The typical bleaching agents contains carbamide or hydrogen peroxide as the active component. The purpose of the review article was to summarize and discuss the available information concerning the effect of peroxide releasing bleaching agent on dental restorative materials and restorations. Information from all original scientific full papers or reviews listed in PubMed or ISI Web Science were included in the review. Bleaching may exert a negative influence on restorations and restorative materials. Advice is provided based on the current literature to minimize the impact of bleaching treatment on restorative materials and restorations.

• Conservation Science in Museum
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• v.1
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• pp.27-35
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• 1999

To get the best result from vacuum freeze drying of water-logged wood, it is necessary for objects to find out the best conditions such as chemicals, appropriate concentration of solution, impregnation method and etc. Such best conditions could be set up by pre-treatment experiments. Two kinds of wood(Pinus densiflora S. et Z. and Quercus acutissima Carruth) were pre-treated by four methods: 2-step PEG treatment(PEG#200-PEG#4000), sorbitol treatment, PEG#200+PEG#4000 treatment, and sorbitol+PEG#4000 treatment. After those pre-treatment, vacuum freeze-drying was undertaken. Then the effect of dimensional stability were compared. When using 2-step PEG treatment, a solution of 60% PEG #4000 got the best dimensional stability for pine and in case of the oak, a solution of 40% PEG#4000 got the best. Sorbitol treatment got rather good result for the pine only when applied with 40% solution of sorbitol. Sorbitol, PEG#200+PEG#4000 and sorbitol+PEG#4000 treatments to the oak didn't affect on dimensional stability sufficiently.

• Journal of the Korean Society of Food Science and Nutrition
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• v.46 no.3
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• pp.368-373
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• 2017

Comparative fining trials were conducted in a laboratory to study the effects of fining treatments including polyvinylpolypyrrolidone (PVPP) and bentonite on the color and clearness of apple wine. The wines were subjected to three different fining treatments: PVPP, PVPP+bentonite (applied at the same time), and PVPP+bentonite (24 h later). Based on the results, all treatments induced noticeable decreases in wine color (APHA value) and turbidity. The treatment including PVPP and bentonite at the same time provided the best results in relation to wine color and clearness. PVPP was the most effective in the reduction of phenolic compounds, which means it helped wine obtain a paler color. Organic acids and aromatic profile were not altered by the fining treatments.

• Journal of Life Science
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• v.28 no.2
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• pp.257-264
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• 2018

The YrdC superfamily is a group of proteins that are highly conserved in almost all organisms sequenced so far. YrdC in Escherichia coli was suggested to be involved in ribosome biogenesis, translation termination, cold adaptation, and threonylcarbamoyl adenosine formation in tRNA. In this study, to unambiguously demonstrate that yrdC is essential in E. coli, we constructed two yrdC mutant strains of E. coli and examined their phenotypes. In the temperature-sensitive yrdC mutant strain, cell growth stopped almost immediately under nonpermissive conditions and it appeared to accumulate 16S ribosomal RNA precursors without significant accumulation of 30S ribosomal subunits. We also cloned yeast and human homologs and demonstrated that they complement the E. coli yrdC-deletion strain. By mutational study, we demonstrated that the concave surface in the middle of the YrdC protein plays an important role in E. coli, yeast, and human versions. By comparison of two yrdC-deletion strains, we also unambiguously demonstrated that yrdC is essential for viability in E. coli and that the functions of its yeast and human homologs overlap with that of E. coli YrdC.

• Journal of Dental Rehabilitation and Applied Science
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• v.31 no.4
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• pp.283-293
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• 2015

Purpose: The aims of this study are to analyze and to visualize distribution of patients visiting at a dental college hospital, using geographic information system (GIS). The visualized data can be utilized in patient care and treatment planning, ultimately leading to the assessment of risk evaluation and prevention of dental diseases. Materials and Methods: Patient information data was obtained from Dankook University Dental Hospital including the unit number, gender, date of birth, and address from 2007 to 2014. Patient distribution was visualized using GIS. Statistical analyses were performed using SAS 9.3 and ArcGIS 10.1. Five factors including proximity, accessibility, age, gender, and socioeconomic status were investigated as the explanatory variables of the patient distribution. Results: The visualized patient data showed a nationwide scale of the patient distribution. There was a little difference in characteristics for each department. As closer at Dankook University Dental Hospital, visitors increased. And it strongly showed that elderly patients in rural areas tend to visit more. Conclusion: The distribution of patients has been shown to be significantly affected by the proximity, accessibility, age, gender and socioeconomic status. The underlying reason remains to be further studied.

• Journal of dental hygiene science
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• v.15 no.5
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• pp.594-602
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• 2015

The purpose of this study was to examine the relationship of oral health status and oral health care to life. The subjects in this study were the patients who visited dental hospitals and clinics in several regions for seven months from March 2013. They got dental checkups, and a survey was conducted. The patients who received general treatment scored highest in Oral Health Impact Profile-14. Among the subfactors, the patients who received general treatment scored higher in functional limitation (8.27), physical pain (7.24), physical restrictions (7.90), social restrictions (7.79), physical limitations (8.14) and social difficulties (8.24). The patients who received orthodontic treatment scored higher in handicap (8.78). All the differences were statistically significant. As for gender gaps, the men scored higher in every factor. By age group, the older patients led a worse quality of life. By occupation, the homemakers mostly led a worse quality of life, and the patients who had no systemic diseases lived a better quality of life. All the differences were significant. Concerning self-rated health status and self-rated oral health state, the patients who found themselves to be in better health and in better oral health led a better quality of life. The differences were significant. Regarding oral health care, the patients who didn't get regular dental checkups and who could visit a dental clinic whenever they had a pain lived a better quality of life. The differences were significant. In terms of oral health status, a higher quality of life was found among the patients who had sound teeth, whose teeth received no sealant treatment, whose teeth received no filling therapy, who had no missing tooth, whose teeth received no prosthetic treatment and who had no dental implants teeth.