• 한국식품과학회지
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• 제50권4호
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• pp.400-406
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• 2018

본 연구는 국내 수도권, 충청, 강원 등지의 중소기업형 소규모 양조장에서 생산되는 탁주와 약주의 미생물 군집 분포를 차세대 염기서열 분석기법을 이용하여 조사하였다. 각 시료별로 미생물 분포에 따른 품질의 차이를 나타냈으며 특히 백미 또는 소맥분을 주로 사용한 탁주와 달리 약주는 찹쌀과 백미를 주원료로 사용하여 각각 독특한 주질과 미생물 분포에 영향을 주었다. 주요검출 미생물로 진균류는 S. cerevisiae가 대부분을 차지하였으며 세균의 경우 Firmicutes문에는 유산균인 Lactobacillus, Leuconostoc, Lactococcus, Weisella 속 등이 우점종으로 확인되었다. 곡물인 원재료에 의해 Cyanobacteria 문의 Chloroplast 속과 제조 환경에 의한 유입으로 추정되는 Cronobacter 속, Enterobacter 속 또한 검출되었다. 이러한 다양한 미생물의 분포는 제조 지역, 주원료, 그리고 제조 방법에 기인할 것으로 판단되며 명확한 상관관계는 확인할 수 없었으나 본 연구 결과 유통과정의 제품 안전성 확보를 위해 양조장별 미생물 관리가 필요할 것으로 판단된다.

• 한국식품과학회지
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• 제53권6호
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• pp.701-705
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• 2021

장새미 마늘은 2012년에 품종보호권이 등록되었으나 재배 면적도 크지 않을 뿐만 아니라 관련 논문도 없어서 본 연구를 실시하였다. 장새미 마늘의 무기물 함량은 칼륨이 가장 많았으며 다음으로 질소, 황, 인 순이었다. 알리인과 알리신도 각각 9.73±0.97, 1.65±0.15 mg/g이었다. 고형물함량은 7.90±0.00°Brix였으며 환원당은 33.42±1.79 mg GE/g이었다. 총페놀 및 플라보노이드 함량은 80.35±2.67 mg GAE/100 g, 33.80±2.17 mg QE/100 g였다. 장새미 마늘의 항미생물활성은 그람음성균보다 그람양성균에서 더 높았으며 특히 Staphylococcus epidermidis와 Micrococcus luteus에서 우수하였다. 이러한 연구 결과는 향후 장새미 마늘을 재배하는 농가에 유용한 정보를 제공해 줄 것으로 기대된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 제4회 영호남학술대회 논문집
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• pp.25-30
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• 2002

The ternary semiconducting compounds of the $A_{4}BX_{6}$(A=Cd, Zn, Hg; B=Si, Sn, Ge; X=S, Se, Te) type exhibit strong fluorescence and high photosensitivity in the visible and near infrared ranges, so these are supposed to be materials applicable to photoelectrical devices. These materials were synthesized and single crystals were first grown by Nitsche, who identified the crystal structure of the single crystals. In this paper. author describe the undoped and $Co^{2+}$-doped $Zn_{4}SnSe_{6}$ single crystals were grown by the chemical transport reaction(CTR) method using iodine of $6mg/cm^{3}$ as a transport agent. For the crystal. growth, the temperature gradient of the CTR furnace was kep at $700^{\circ}C$ for the source aone and at $820^{\circ}C$ for the growth zone for 7-days. It was found from the analysis of x-ray diffraction that undoped and $Co^{2+}$-doped $Zn_{4}SnSe_{6}$ compounds have a monoclinic structure. The optical absorption spectra obtained near the fundamental absorption edge showed that these compounds have a direct energy gaps. These temperature dependence of the optical energy gap were closely investigated over the temperature range 10[K]~300[K]

• 농업과학연구
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• 제39권3호
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• pp.413-420
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• 2012

Spectroscopic measurement method based on visible and near-infrared wavelengths was prominent technology for rapid and non-destructive evaluation of internal quality of fruits. Reflectance measurement was performed to evaluate firmness, soluble solid content, and acid content of truss tomatoes by hyperspectral reflectance imaging system. The Vis/NIR reflectance spectra was acquired from truss tomatoes sorted by 6 ripening stages. The multivariable analysis based on partial least square (PLS) was used to develop regression models with several preporcessing methods, such as smoothing, normalization, multiplicative scatter correction (MSC), and standard normal variate (SNV). The best model was selected in terms of coefficient of determination of calibration ($R_c^2$) and full cross validation ($R_{cv}^2$), and root mean standard error of calibration (RMSEC) and full cross validation (RMSECV). The results of selected models were 0.8976 ($R_p^2$), 6.0207 kgf (RMSEP) with gaussian filter of smoothing, 0.8379 ($R_p^2$), $0.2674^{\circ}Bx$ (RMSEP) with the mean of normalization, and 0.7779 ($R_p^2$), 0.1033% (RMSEP) with median filter of smoothing for firmness, soluble solid content (SSC), and acid content, respectively. Results show that Vis / NIR hyperspectral reflectance imaging technique has good potential for the measurement of internal quality of truss tomato.

• 한국식생활문화학회지
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• 제28권4호
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• pp.401-408
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• 2013

The objective of this study was to determine the quality characteristics of cabbage juice fermented by lactic acid bacteria from Kimchi (Leuconostoc mesenteroides, Lactobacillus sakei SL1103, Lactobacillus plantarum LS5, and mixed starter). Cabbage juice was inoculated with lactic acid bacteria and fermented at 30 for 72 hrs. Changes in lactic acid bacteria number, pH, titratable acidity, Brix, and color during fermentation were analyzed. After fermentation for 24 hrs, cabbage juice fermented by mixed starter showed the highest number of lactic acid bacteria (9.45 log CFU/mL). The pH of all cabbage juice also decreased to 3.88~4.19 sharply, while cabbage juice fermented by Lac. sakei SL1103 showed the highest Brix ($8.38^{\circ}Bx$). Cabbage juice fermented by mixed starter showed the highest L value (56.83). In the sensory evaluation, cabbage juice fermented by a mixed starter (Leu. mesenteroides, Lac. sakei SL1103, and Lac. plantarum LS5) showed the highest preferences in taste, flavor, and overall acceptability. Therefore, cabbage juice fermented by mixed starter (Leu. mesenteroides, Lac. sakei SL1103 and Lac. plantarum LS5) has the highest potential for the development of fermented cabbage juice as an excellent bioactive functional food.

• Journal of the Korean Physical Society
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• 제73권11호
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• pp.1619-1624
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• 2018

Laser ablation may provide a minimally invasive palliative treatment for pancreatic cancer. The aim of the current study was to assess the feasibility of a 532-nm laser equipped with a cylindrical light diffuser for the treatment of pancreatic cancer. Monolayers of BxPC-3 human pancreatic cancer cell were exposed to 532 nm laser light. Power levels of 5 - 7 W were used to uniformly target the entire cell colonies for 60 and 120 seconds. The cells were incubated for 24 hours after treatment and viabilities were determined by using a MTT assay. Laser ablation was performed by using the cylindrical light diffuser on six pancreatic tumor tissues obtained from pancreatic cancer xenograft mouse models, which were exposed to the 532 nm light at 5W or 7W for 10 to 30 seconds. In the in vitro study, the survival rates of the pancreatic cancer cells were reduced by 6.6% to 98.9% after the treatment, and the survival rates were reduced by increasing laser power and/or irradiation time. In the pancreatic tumor tissues, a homogenous circular ablation zone was observed in all tumors and the ablation distance induced by the laser irradiation showed to be constant from the diffuser to all directions (standard deviation, 0.3 - 1.3 mm). Ablation distance and area increased with increasing laser power and/or irradiation time. The 532 nm laser effectively killed pancreatic cancer cells, and the cylindrical light diffuser was found to be suitable for laser ablation as it provided uniform ablation in pancreatic cancer.

• 한국식품과학회지
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• 제48권2호
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• pp.142-146
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• 2016

본 연구는 단호박 유통을 위한 최적 후숙 조건을 구명하기 위해 수행하였다. 가용성고형물 함량은 수확 직후 $6.0^{\circ}Bx$에서 후숙 기간이 길어짐에 따라 증가하였다. 후숙 온도가 높을수록 가용성 고형물 함량이 높게 나타났다. 과피 및 과육의 색차변화는 Hunter 'b'값을 측정한 결과 과피는 수확 직후 2.42에서 후숙기간 동안 증가하여 후숙 18일 $25^{\circ}C$ 조건은 6.91, $30^{\circ}C$ 조건은 7.56으로 나타났다. $35^{\circ}C$의 경우 후숙 9일 7.79로 과피 황화현상이 발생하여 외관품질이 저하되었다. 녹말함량은 후숙 온도가 높을수록 낮은 함량을 보였다. 자당 함량은 후숙 기간이 길어질수록 모든 온도조건에서 증가하였다. 이상의 결과를 종합하면 $25^{\circ}C$ 조건에서는 18-21일, $30^{\circ}C$는 12-15일간 후숙이 적합하다고 판단된다.

• 한국수학사학회지
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• 제32권4호
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• pp.159-173
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• 2019

In this paper, we examine the brief history of the ring of four almonds regarding Mesopotamian mathematics, and present reasons why the Omar Khayyam's triangle, a special right triangle in a ring of four almonds, was essential for artisans due to its unique pattern. We presume that the ring of four almonds originated from a point symmetry figure given two concentric squares used in the proto-Sumerian Jemdet Nasr period (approximately 3000 B.C.) and a square halfway between two given concentric squares used during the time of the Old Akkadian period (2340-2200 B.C.) and the Old Babylonian age (2000-1600 B.C.). Artisans tried to create a new intricate pattern as almonds and 6-pointed stars by subdividing right triangles in the pattern of the popular altered Old Akkadian square band at the time. Therefore, artisans needed the Omar Khayyam's triangle, whose hypotenuse equals the sum of the short side and the perpendicular to the hypotenuse. We presume that artisans asked mathematicians how to construct the Omar Khayyam's triangle at a meeting between artisans and mathematicians in Isfahan. The construction of Omar Khayyam's triangle requires solving an irreducible cubic polynomial. Omar Khayyam was the first to classify equations of integer polynomials of degree up to three and then proceeded to solve all types of cubic equations by means of intersections of conic sections. Omar Khayyam's triangle gave practical meaning to the type of cubic equation $x^3+bx=cx^2+a$. The work of Omar Khayyam was completed by Descartes in the 17th century.

• 농업생명과학연구
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• 제53권5호
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• pp.37-49
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• 2019

Environmental conditions are important in increasing the fruit sugar content and productivity of the new cultivar Autumn Sense of Actinidia arguta. We analyzed various soil properties at experimental sites in South Korea. A Pearson's correlation analysis was performed between the soil properties and sugar content or productivity of Autumn Sense. Further, a decision tree was used to determine the optimal soil conditions. The difference in the fruit size, sugar content, and productivity of Autumn Sense across sites was significant, confirming the effects of soil properties. The decision tree analysis showed that a soil C/N ratio of over 11.49 predicted a sugar content of more than 7°Bx at harvest time, and soil electrical capacity below 131.83 µS/cm predicted productivity more than 50 kg/vine at harvest time. Our results present the soil conditions required to increase the sugar content or productivity of Autumn Sense, a new A. arguta cultivar in South Korea.

• 한국작물학회지
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• 제43권4호
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• pp.259-263
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• 1998

High molecular weight glutenin (HMW-Glu) subunit compositions of 73 Korean wheat cultivars and experimental lines were evaluated by using one dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis. This method is suitable for obtaining a good resolution of 1Dx2 and 1Ax2$^*$ without adverse effects on separation of other HMW-Glu subunits. Korean wheats examined in this study could be divided into 15 different groups on the basis of HMW-Glu subunit compositions. From the wheat lines tested, it was identified that there were three alleles at the Glu-Al, five at the Glu-Bl and three at the Glu-D1 loci. The null allele of the Glu-Al was occurred in high frequency (79.4%), while low frequencies for 1Ax1 (12.3%) and 1Ax2$^*$(8.2%) were found. High frequency (75.3%) of the subunit pairs of 1Bx7+1By8 at the Glu-Bl loci compared with other subunits was found. The frequencies of subunits 1Dx2. 2+1Dy12 and 1Dx2+1Dy12 from the Glu-D1 loci were 54. 8% and 37.0%, respectively. However, a few Korean wheat lines (8.2%) carried 1Dx5 + 1Dy10 subunit pair which are responsible for good breadmaking quality. The information of HMW-Glu subunit compositions provide a useful tool to characterize wheat lines, and can be directly used in selection of breeding lines of different end-use properties.