• Korean Journal of Mineralogy and Petrology
• /
• v.36 no.4
• /
• pp.345-353
• /
• 2023

This study aimed to investigate the differences in the commercial powder products of the Yeongdong illite based on sales specifications, specifically examining the mineralogical composition, particle size, and chemical composition according to mesh size. The goal was to understand the characteristics of illite powder products and utilize them as a mineralogical database for exploring various applications. Commercial illite powder samples obtained from two mines were subjected to various experiments, including X-ray diffraction (XRD) analysis, laser diffraction particle size analysis, and scanning electron microscopy analysis, X-ray fluorescence analysis. The XRD analysis revealed that the illite powder products from the two mines mainly consisted of illite/muscovite, quartz, and feldspar, indicating similar constituent minerals matching with those of ores for each mine. Laser diffraction particle size analysis indicated the difference in particle size distribution depending on the product specifications, with particle size uniformity tending to increase with increasing mesh sizes. Scanning electron microscopy analysis showed variations in particle shape and size based on specifications. The size of illite particles did not vary significantly with product specifications, with noticeable changes observed mainly in the particle sizes of quartz and feldspar. Furthermore, although there were some differences in chemical composition among the samples from different mines, no significant variations were observed according to specifications. Based on these results, when considering the application of commercial illite powder, it is essential to carefully select it with the consideration of its specifications to account for characteristic variations. The findings of this study present support the great potential of various application fields of commercial illite powder, contributing to industrial utilization and the development of new technologies.

• Korean Journal of Plant Tissue Culture
• /
• v.28 no.6
• /
• pp.347-351
• /
• 2001

Panax ginseng C.A. Meyer is a well-known Korean traditional medicine. Until now, even though major research of ginseng has been focused on the pharmacological effect, clinical application and chemical analysis of extracted secondary metabolite for several years, the physiology and gene functions of ginseng were not well known. In this research, we have developed the protein extraction methods of ginseng root and hairy root for proteome analysis in order to elucidate the gene(s) function of ginseng. Using the liquid nitrogen (equation omitted) TCA method as protein extraction method, about 660 protein spots were detected on the 2-DE gel of hairy root. Additionally, comparative analysis result of 2-DEs of ginseng root (equation omitted) hairy root suggested that proteomes of same organism could be changeable according to the culture condition, growth stages and other stimulus.

• Journal of the Mineralogical Society of Korea
• /
• v.14 no.1
• /
• pp.12-20
• /
• 2001

충북 영동군 동창광산에서 산출되는 일라이트(illite)광선의 표면화학특성을 전위차 적정 실험과 FITEQL3.2 프로그램을 이용하여 연구하였다. 정량 Xtjs 회절 분석에 의한 일라이트 광석의 광물조석은 석영 46.6% 일라이트 41.6% 카올리나이트(kaolinite) 11.8%이며 $N_2$BET 방법에 의하여 구한 비표면적은 $6.52 m^2$g이다. 전위차 적정 실험결과를 그란(Gran)법을 적용하여 구한 일라이트광석의 영전하점($pH_{pznpc}$ )은 pH 3.9 총표면 자리 밀도는 21.24 sites/$nm^2$이다. 표면 복합체 모델중 일정 용량 모델을 적용해 일라이트 광석의 표변 특성에 알맞는 모델을 찾아보았다. 일라이트 광석의 표면을 사면체 자리와 팔면체 자리로 나누어 설정한 2sites$-3pK_{ a}$s 모델은 변수값이 수렴되지않았으므로 부적절하다고 판단된다. 일라이트 광석의 표면을 하나의 균질한 흡착표면으로 가정해서 설정한 1 site -1 $K_{a}$ 와 1 site -2 $pK_{a}$ s 모델 사이에는 뚜렷한 차이는 없지만, 1 site -1 $pK_{a}$ 모델의 WSOS/DF 값이 17, 1 site - 2 $pK_a{s}$ 모델은 26으로서 앞 모델이 보다 적절하다. 이 결과는 일라이트 광석 표면에서 수소의 해리와 첨가 반응 중 첨가 반응을 무시하여도 표면반응을 설명하는 데 큰 무리가 없음을 시사한다. 가장 적절하다고 판단되는 1 site -1 $pK_{a}$ 모델의 $pK_{a}$ 값은 4.17, specific capacitance는 $6F/m^2$ 표면 자리 농도는 $1.15\Times10^{-3}$ mol/L 이다.

• Journal of the Korean Chemical Society
• /
• v.50 no.1
• /
• pp.37-45
• /
• 2006

gel electrophoresis (CGE) with poly(ethylene oxide) has been applied to the measurement of CAG repeat number in Androgen receptor (AR) gene related to male infertility. Non-linear regression analysis was performed using the standard X174 RF/Hae III, 100bp step ladder DNA in order to investigate the exact number of CAG repeat. For 79 Korean infertile males and 89 controls, CAG repeats at exon 1 in AR gene was compared and analyzed by CGE. It turned out that CAG repeat numbers were 24.972.6 range, 17-29) for the infertile male, and 23.992.4 range, 18-29) for the control, respectively. P value (0.018) was less then 0.05, meaning that the result was statistically meaningful.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2019.05a
• /
• pp.369-369
• /
• 2019

최근 전 세계적 기상이변으로 홍수 가뭄 폭설 혹서 혹한 등의 재해 때문에 많은 사람들이 고통에 시달리고 있다. 기상이변으로 인한 재해는 과거에도 존재하였으며 한민족의 역사와 함께하였다. 온고이지신가 이위사의(溫故而知新可以爲師矣)는 논어의 위정편(爲政編)에 나오는 공자의 말씀이다. '옛 것을 익혀 새것을 알면 남의 스승이 될 수 있다'라는 뜻으로 재난을 연구하는 연구자의 입장에서 보면 반드시 새겨둘 구절이다. 역사 속에서 자연재해는 군주(君主)의 부덕(不德)이나 실정(失政)의 소치(所致)로 여겨지고 나아가서는 왕조나 국운의 쇠퇴와도 관련이 이어지기까지 했다. 이미 과거 자연기록에 있었던 일들이며 이러한 사실은 세계문화유산으로 지정된 "조선왕조실록"을 통해 조선시대의 자연재해 기록을 살펴볼 수 있다. "조선왕조실록"을 보면 경술년 현종 11년(1670년 5월 2일) "가없는 우리백성들이 무슨 죄가 있단 말인가. 아, 허물은 나에게 있는데, 어째서 재앙은 백성에게 내린단 말인가." 1671년 말 경신대기근으로 인한 사망자 수가 100만 명에 이른다고 기록도 있다. 기양의례'란 가뭄, 홍수, 전염병 같은 자연재해만이 아니라 개인의 질병과 불행 등 일상적인 삶의 조건을 위협하는 상황이 닥쳤을 때 이를 소멸하고자 거행하는 대표적인 재난문화의 종류이며 비정기적 의례를 의미한다. 조선시대에 기양의례는 재난대응의 상징적인 의미를 갖고 있다. 현재의 우리나라로 보면 재난안전대책 본부와 비견할 수 있다. 조선시대에는 "기양의례"를 통해 임금을 포함한 조정이 적극적 해결의지를 천명하고 각 고을의 관리와 지방군을 동원하여 수습 복구에 최선을 다했다. 부세를 견감하고 구제곡을 지급하는 등의 진휼정책이 뒤따랐다. 백성들도 오가작통제와 향약을 통해 환난상휼을 실천하였다. 이처럼 조선시대에는 비록 기술적인 부분은 미약했지만 재난대응의 체계만큼은 상당히 앞서있었다. 본 연구에서는 조선시대의 강원도 영동지방 자연재난사례를 조선왕조실록을 통해 조사하고 재난에 대응하기 위한 재난문화를 조사하고자 한다.

• Journal of Radiation Protection and Research
• /
• v.31 no.2
• /
• pp.65-68
• /
• 2006

In this study, the extent of plasmid DNA damage was observed according to concentration of BSH(Boron Sulfhydryl Hydride) and irradiation doses of neutron and ${\gamma}$-ray. The plasmid used was both pBR 322 (2870 bp) and ${\Phi}X174$ RF(5386 bp) DNA. Plasmid DNA damage by irradiation in the presence of BSH was analyzed by agarose gel electrophoresis. In the neutron experiment, DNA damage of both plasmid DNAs was increased according to increasing the concentration of BSH and neutron doses. But in the ${\gamma}$-ray experiment, there appeared no dose dependency as compared to the neutron experiment. The extent of the plasmid DNA damage in the presence of BSH was somewhat different according to irradiation by neutron or ${\gamma}$-ray.

• Journal of Agricultural Extension & Community Development
• /
• v.7 no.1
• /
• pp.65-74
• /
• 2000

Agricultural extension services in YoungDong county, ChungBuk province have tried and changed many things to overcome difficult situations since localization of extension services in 1997. The county Rural Guidance Office changed the name of the office as county Agricultural Technology & Extension Center (ATEC), and has been operated as a service center for all people who need help in agriculture. The recent efforts of the ATEC have been placed on eco-friendly agriculture and sustainable agriculture for protecting the natural environment of the county as well as production of safe agricultural products. In order to overcame difficult situations under the IMF, the ATEC has tried to find new ways for the extension services because of reduced extension educators under the IMF restructuring. The followings were a few examples of many efforts in various fields to overcome difficult situations in the rural county; 1) The ATEC has supported services to produce safe and high quality agricultural products and to increase their high value through extension services for food processing. 2) The ATEC has opened experimental fields for farmers who want to learn new technologies to cultivate grapes, persimmons, apples and pests etc., specialty fruit trees in the county. 3) The ATEC has implemented many kinds of programs to improve the quality of the extension educators to serve better.

• Korean Journal Plant Pathology
• /
• v.12 no.1
• /
• pp.91-98
• /
• 1996

벼도열병균 14개 균주와 벼 이외 화본과 식물 도열병균 12개 균주를 대상으로 rDNA의 ITS II 부위를 증폭하여 그들의 핵산 구조 차이를 분석함으로 도열병균 균주간 분류를 시도하였다. 5.8S rDNA의 3`-말단 부위와 28S rDNA의 5`-말단 부위의 sequence 중 5`-CCCGGGAATTCGCATCGATCGATCGAATGAAGA-ACGCAGC-3`와 5`-CCCGGGATCCTCCGCTTATT-GATATGC-3`를 이용하여 PCR 증폭을 하였을 때 벼도열병균 14개 균주는 동일한 길이의 단일 밴드를 형성하였으며 벼 이외 화본과 식물 도열병균에서는 레드톱 식물로부터 분리한 도열병균만이 나머지 균주보다 38bp가 더 큰 길이를 가진 밴드를 형성하였다. PCR로 증폭된 DNA를 HaeIII와 MspI 제한효소로 절단하였을 때 벼도열병균 레이스간에는 제한효소 절단에 의한 전기영동 밴드 형태 차이를 관찰할 수 없었으나, 벼 이외 화본과 식물 도열병균 12개 균주는 3군으로 구분할 수 있었다. 벼도열병균 90=054와 강아지풀에서 분리한 도열병균 G90-5, 기장에서 분리한 G88-4, 바랭이에서 분리한 G88-5 그리고 레드톱에서 분리한 RT 균주의 ITS II 부위의 DNA 염기서열 비교 분석에 의하면 G88-4와는 다른 HaeIII와 MspI 제한효소 위치를 가지고 있었기에 제한효소 절단에 의한 전기영동 형태가 상이하였다. 또한 RT균주는 HaeIII와 MspI위치가 존재하지 않았다.

• Journal of Korean Society of Rural Planning
• /
• v.23 no.3
• /
• pp.73-81
• /
• 2017

The importance key to overcome crisis in rural society is to utilize multivaluedness of rurality. In order to comprehend and utilize a variety of multivaluedness of rurality, firstly it should be needed to investigate and analyze the rural resource. secondly it should be needed to make a plan reflected re-evaleted rural resources. This study aimed at setting up the analysis of all villages in Yeongdong-Gun, Chungcheongbuk-Do by 5 rural village types(Basic life-supporting, Agricultural promotion, Marketing/processing oriented, Urban-rural communication, Life-style choice types) differed in score of classified indicators. These results are expected to be helpful to make a rural development plan reflected villages' characteristics based on rural resources.

• Journal of the Korean Wood Science and Technology
• /
• v.35 no.1
• /
• pp.36-43
• /
• 2007

Elemental analysis, SEM-EDX, X-ray diffraction (XRD) and IR analysis were adopted to examine the quality of charred woods excavated from the underground of the Daewoongjeon Hall of Youngguksa Temple, Youngdong-gun, Chungbuk, Korea. A large amount of calcium was detected in SEM-EDX analysis. The analyses of chemical elements suggested that completely charred wood was carbonized at about $500^{\circ}C$. The XRD results indicated the destruction of cellulose crystalline region. The IR analysis exhibited that thermal degradation of wood component was different depending upon the carbonization temperature. It can be suggested from the results that PEG with different molecular weights should be used for the conservation of excavated charred woods.