• 보존과학회지
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• 제31권2호
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• pp.125-130
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• 2015

전통 칠기의 보존처리에 있어 수리 복원 기술이나 재료 등에 관한 명확한 기록이나 전승이 제대로 이루어지지 않고 있다. 본 연구는 목칠기 보존처리 중 하지층 복원에 사용되는 충진제의 기초적인 특성을 비교하여 칠기 하지층 복원시 적합한 재료를 선택적으로 사용하는데 목표를 두고 있다. 토회와 3종의 첨가제를 혼합한 토회, 곡수를 사용하여 시료를 제작하여 건조속도, 색도, 내충격성, 연마도를 비교하였다. 건조 속도는 토회, 목분 혼합, 목탄분 혼합, 와분 혼합, 곡수, 맥칠 시료의 순이었으며, 상대적으로 토분의 비율이 많아질수록 건조속도는 빠르고, 표면의 균열이 심해졌다. 내충격성 또한 토분의 비율이 많아질수록 낮은 값을 보였다. 첨가제의 종류에 따른 차이는 크지 않았으며 곡수와 첨가제를 혼합한 시료 모두 상대적으로 높은 내충격성을 보였다. 연마도의 경우 토분의 양이 많아질수록 커지고, 목분과 목탄분을 혼합한 시료 역시 큰 연마도를 보였다. 맥칠과 곡수 시료는 가장 큰 연마도를 보였고 와분을 혼합한 시료의 경우 가장 낮은 연마도를 보였다.

• Applied Biological Chemistry
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• 제38권5호
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• pp.478-483
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• 1995

한국산 쌀(일반계 일품벼)로부터 돌연변이 억제물질의 구성성분을 확인할 목적으로 methanol 추출물을 용매분획 및 column chromatography하여 활성 spot을 분리하고 정성 분석과 기기분석을 수행하였다. Ether, ethylacetate, butanol 및 수용성 용매 획분 가운데 ether 획분의 억제활성이 가장 높았으며 silica gel column chromatography를 시행하여 성분을 분리하였을 경우 methanol추출물의 억제활성이 80% 이상으로 나타났던 결과와 비교하여 분리가 진행됨에 따라 억제활성은 $0{\sim}30%$로 감소하였다. 활성 물질을 정성분석한 결과 ferric chloride, 2,7-dichlorofluorescein, antimony pentachloride, phosphomolybdic acid, bromothymol blue, rhodamin 6G등의 시약에서는 양성을, ninhydrin, Bial's orcinol 시약에서는 음성을 나타내어 억제활성 물질은 페놀성 화합물과 지질성분인 것으로 조사되었다. 분리된 활성획분을 GC/Mass로 확인한 결과 o-hydroxy benzyl alcohol (saligenin), octanoic acid(caprylic acid), 9,12-cis-octadecadienoic acid(linoleic acid), 11-cis-octadecenoic acid(oleic acid), hexadecanoic acid(palmitic acid), 1H-indole-2-carboxylic acid, 및 1,2-benzenedicarxylic acid(phthalate)가 주요 구성성분인 것으로 분석되었으며 이들 성분들의 억제활성은 표준시약을 사용한 항변이원성 시험에서 재확인되었다.

• 한국농공학회지
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• 제16권4호
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• pp.3600-3610
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• 1974

Experimental work of batch-type dryer was conducted to develop its optimurm operating conditions by analyzing the major factors which affect the drying performance. A laboratory batch-type dryer was constructed and tested for various levels of heated-air rates, and depths of grain deposit. Tong-il rice variety having the initial moisture content of approximaely 23 per cent in wet basis was used for the experiment. The criteria selected for establishing the optimum operating condition were the drying performance rate, the thermal efficiency, and the operational cost of the dryer. The results of the study are summarized as follows: 1. The performance rate of dryer for a specific operating condition was defined as total amount of material dried per hour when the moisture content of grains in the upperlayer reaches to 16 per cent in wet basis. The optimum operating conditions as viewed in the rate of drying performance could be justified by functional realtionship between the depth of grain deposit and air flow rate. In other words, there was a definite depth of grain deposit for a given air-rate which make the dryer performance maximum. The optimum grain depth for the batch-type dryer with 3.3㎡ loading area and with the attached axial fan was about 35cm. 2. The thermal efficiency for the dryer was evaluated by the ratio of the latent heat required to evaporate the grain moisture to the heat input required to raise the ambient air-temperature to 40 degree centigrade. The optimum operating condition as viewed in term of thermal efficiency analyzed was that grater depth and lower air flow-rate may be desirable. This condition is contracted with the optimum condition as viewed by the dryer performance rate. 3. The annual operating cost of batch-type dryer was analyzed for different annual hour of use and for different operation condition. The optimum condition as viewed in terms of operating cost was almost identical to one as viewed in terms of dryer performance rate. Therefore, the most economical use of batch-type dryer for the same annual operating hours can be obtained when the dryer operated in the condition of maximum dryer performance rate. Increasing the annual operating hour may be desirable to cut down the dryer operation cost, since the annual hour of dryer use is much sensitive to the operating cost than any peractical conditions of dryer operation. 4. The most desirable operational condition as justified by combining all the criteria, dryer performance rate, thermal efficiency and annual operating cost, could be concluded to operate the dryer in the condition of maximum performance rate. The condition in general is identical to the lowest operation cost for a given annual operating hour.

• 대한환경공학회지
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• 제27권2호
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• pp.130-137
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• 2005

본 논문은 매립장 복토재로 사용될 열분해 차르의 중금속 및 VOCs의 흡착거동을 조사하였다. 열분해 과정에서 슬러지에 함유된 휘발분이 가스화 됨으로서 모체에 세공이 형성되었다. 휘발분의 가스화로 인해 형성된 세공을 확인하기 위하여 질소 흡착/탈착 실험을 한 결과, 열분해 차르($14.56\;m^2/g$)가 유기성 폐슬러지($6.68\;m^2/g$)보다 비표면적이 2배 정도 증가한 것을 확인할 수 있었다. 열분해 차르는 BDDT 분류의 Type II와 V의 중간 형태의 흡착특성을 나타냈으며, 약간의 미세공이 형성되었음을 보여주었다. 에틸벤젠과 톨루엔의 흡착실험 결과를 Freundlich 흡착등온선에 적용한 결과, 열분해 차르는 화강토나 유기성 폐슬러지보다 이들 물질에 대해 흡착능이 우수하였다. 또한 열분해 차르의 중금속 흡착실험에서도 어느 정도 중금속 흡착능력을 보여주었다. 이것은 열분해 차르가 매립장 복토재로 사용될 경우, 매립장으로부터 유해물질을 흡착/흡수하여 지하수와 토양이 오염되는 것을 막아주는 효과를 가지고 있음을 말해준다.

• 한국식품영양과학회지
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• 제37권1호
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• pp.72-75
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• 2008

경북 풍기지역의 연근별 수삼을 이용한 홍삼제조에 따른 전반적인 품질특성을 분석하였다. 그 결과 5년근 홍삼은 색택, 외관, 직경, 내부품질 등에서 6년 근과 유사하거나 다소 저조하였으나, 길이와 수율 면에서는 우수한 것으로 나타났다. 또한 홍삼의 유효성분인 ginsenoside 함량은 5년 근이 홍삼의 특이성분이라고 할 수 있는 ginsenoside $Rg_3$ 및 $Rh_2$ 함량이 더 높은 것으로 나타났다. 따라서 경북 풍기지역의 홍삼제조에 있어서는 5년 근 수삼을 원료삼으로 사용하는 것이 전반적인 품질 및 유효성분 측면에서 매우 타당한 것으로 평가되었다.

• 동아시아식생활학회지
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• 제17권6호
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• pp.903-910
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• 2007

In order to make acquire a potential use for Opuntia humifusa as a natural functional food material, this study was performed to determine the quality properties of Jeung-pyun made with added Opuntia humifusa, or prickly pear powder. According to an analysis of its major components, we found that the prickly pear powder consisteds of nitrogen-free extracts (71.85%) and crude fiber (11.20%). Greater additions of prickly pear powder had resulted in significantly lower pH in the of Jeung-pyun. According to measurements on the degree of Jeung-pyun gelatinization, by means of ${\beta}$-amylase, greater additions of prickly pear powder led to the higher levels of isolated maltose, indicating that the gelatinization degree of the Jeung-pyun became higher. Also, samples with higher concentrations of prickly pear powder had a tendency toward lower water content, which allowed us to expect a longer storage duration for the Jeung-pyun. In the textural property tests the Jeung-pyun that had less hardness and greater adhesiveness (p<0.05) than the control group as the content of prickly pear powder became higher. Also, the Jeung-pyunhad lower gumminess and chewiness than the control group as the content of prickly pear powder became higher. Therefore, it is possible to prepare relatively soft Jeung-pyun using prickly pear powder. For the color differences of the Jeung-pyun samples, lower L- values, and higher a- and b -values (p<0.05) presented as the addition level of prickly pear powder became higher. According to SEM observations of the Jeung-pyun, the added prickly pear powder addition groups generally showed a smaller and more inconsistent pore size, but higher porosity, than the control group. According to sensory analyses of the Jeung-pyun, the P2 group scored highest for color item, and the P4 group generated the fermented scent. Higher additions content of prickly pear powder led to the lower score, but higher scores for adhesiveness. Finally, the P2 group achieved the highest score for overall taste.

• Bulletin of the Korean Chemical Society
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• 제30권8호
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• pp.1719-1723
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• 2009

The LiFeP$O_4$ powder was synthesized by using the solid state reaction method with Fe($C_2O_4){\cdot}2H_2O,\;(NH_4)_2HPO_4,\;Li_2CO_3$, and chitosan as a carbon precursor material for a cathode of a lithium-ion battery. The chitosan added LiFePO4 powder was calcined at 350 ${^{\circ}C}$ for 5 hours and then 800 ${^{\circ}C}$ for 12 hours for the calcination. Then we calcined again at 800 ${^{\circ}C}$ for 12 hours. We characterized the synthesized compounds via the crystallinity, the valence states of iron ions, and their shapes using TGA, XRD, SEM, TEM, and XPS. We found that the synthesized powders were carbon-coated using TEM images and the iron ion is substituted from 3+ to 2+ through XPS measurements. We observed voltage characteristics and initial charge-discharge characteristics according to the C rate in LiFeP$O_4$ batteries. The obtained initial specific capacity of the chitosan added LiFeP$O_4$ powder is 110 mAh/g, which is much larger than that of LiFeP$O_4$ only powder.

• 한국동물위생학회지
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• 제33권2호
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• pp.135-141
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• 2010

Bovine brucellosis, an important zoonosis, is diagnosed with serological tests such as the RBT, TAT using inactivated whole bacterial cells or bacterial lipopolysaccharide (LPS) antigen in Korea. However, a strong cross-reaction between Brucella spp. and Yersinia enterocolitica O9 in these tests has seriously complicated the diagnosis of animal brucellosis because Brucella spp. shares common antigenic determinants with Y. enterocolitica O9 in the smooth LPS region. In this study, Brucella-field strains were isolated from Brucellapositive Hanwoo in Kimhae, Korea and outer membrane protein (omp) which has low cross-reaction with Y. enterocolitica O9 and high immunogenicity was extracted from the field strains Then we compared ELISA using the extract with RBT-TAT. Fifteen field strains were isolated from 47 supra-mammary-lymph nodes, which were collected from 18 farms. Isolation rate was 32%. Brucella-specific antigen was identified by performing SDS-PAGE or Western blotting on extracted omp with at 0.5% n-lauroylsarcosine One hundred and ninety-two serum-samples were used in the experiment: 142 negative and 50 positive samples verified by RBT-TAT. According to ELISA results, 127 samples were negative and 15 appeared positive among 142 negatives by RBT-TAT, while 42 samples were positive and 8 were negative among 50 positives by RBT-TAT. Therefore, it showed 89.4% of specificity and 84% of sensi-tivity. Through the current experiments, we could set up an ELISA based on the omp which has low cross-reaction and high immunogenicity and concluded that the omp could be a good material for accurate diagnosis of bovine brucellosis.

• 콘크리트학회논문집
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• 제23권3호
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• pp.331-338
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• 2011

이 연구는 미생물 혹은 생물의 다양한 기능을 이용한 환경의 수복(bioremediation)을 활용한 자연 친화형 수질 정화 시멘트 벽돌로서의 가능성을 검토하고자 하였다. 현재 유용 미생물을 건축 소재에 활용하여 수질을 개선하는 연구들이 제안되어 왔다. 이 연구에서는 이러한 미생물의 수질 정화 능력을 이용하는 것으로서 선행 연구의 낫토균 이외에 된장균, 대구 S환경사업소에서 미생물을 탐색하여 16S rDNA 염기서열 분석법에 의해 동정된 유용 미생물 자원들을 이용하였으며, 이렇게 확보된 수질 정화 능력을 가진 유용 미생물 자원들에 대한 시멘트 벽돌에서의 수질 정화 특성을 검토하였다. 또한 시멘트 벽돌에 미생물을 흡착시키기 위하여 제올라이트를 사용 하였으며, SEM 분석을 통하여 제올라이트에 미생물이 흡착되어 있는 것을 확인 할 수 있었다. 실험 결과 유용 미생물을 이용 하였을 때 우수한 오염물질 제거율이 나타났기 때문에 자연 친화형 건설재료의 유용 미생물 활용이 가능하다고 판단되며, 이 연구에서 소개한 미생물 이외에도 다양한 미생물 자원들을 확보하여 건축 소재에 활용 가능한 수질 개선용 유용 미생물 자원들을 확보할 수 있을 것으로 기대된다.

• Journal of Periodontal and Implant Science
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• 제38권2호
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• pp.143-152
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• 2008

Purpose: Specific bacteria are believed to play an important role in chronic periodontitis. Although extensive microbial analyses have been performed from subgingival plaque samples of periodontitis patients, systemic analysis of subingival microbiota has not been carried out in a Korean population so far. The purpose of this study was to investigate the prevalence of 29 putative periodontal pathogens in Korean chronic periodontitis patients and evaluate which pathogens are more associated with Korean chronic periodontitis. Material and Methods: A total of 86 subgingival plaque samples were taken from 15 chronic periodontits(CP) patients and 13 periodontally healthy subjects in Korea. CP samples were obtained from the deepest periodontal pocket (>3 mm probing depth[PD]) and the most shallow periodontal probing site ($\leq$3 mm PD) in anterior tooth and posterior tooth, respectively, of each patient. Samples in healthy subjects were obtained from 1 anterior tooth and 1 posterior tooth. Polymerase chain reaction (PCR) of 16S ribosomal DNA (rDNA) of subgingival plaque bacteria was performed. Detection frequencies(% prevalence) of 29 putative periodontal pathogens were investigated as bacterium-positive sites/total sites. Results: With the exception of Olsenella profuse and Prevotella nigrescens, the sites of diseased patients generally showed higher prevalence than the healthy sites of healthy subjects for all bacteria analyzed. Tanerella forsythensis (B.forsythus), Campylobacter rectus, Filifactor alocis, Fusobacterium nucleatum, Porphyromonas endodontalis and Porphyromonas gingivalis were detected in more than 80% of sites with deep probing depths in CP patients. In comparison between the sites (deep or shallow PD) of CP patients and the healthy sites of healthy subjects, there was statistically significant difference(P<0.05) of prevalence in T.forsythensis (B.forsythus), C.rectus, Dialister invisus, F.alocis, P.gingivalis and Treponema denticola. Conclusion: Our results demonstrate that the four putative periodontal pathogens, T.forsythensis (B.forsythus), C.rectus, P.gingivalis and F.alocis are closely related with CP patients in the Korean population.