• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.294-294
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• 2017

Rice (Oryza sativa L.) is one of the main agricultural crops in Asian countries, including Korea, and is considered as the most important staple food in the world. Rice is also processed into flour, which is consumed through various foods such as cake, noodle, bread, and confectionary. Rice flour quality is highly dependent on variety and milling conditions. Producing rice flour with fine particles is more difficult than wheat flour because of its grain hardness. The Korean rice varieties representing different amylose contents were selected for this study. The relationship between the morphological and starch characteristics of rice kernels and the appropriate varieties for producing good-quality, dry-milled rice flour were examined. The hardness of the rice kernels was determined by measuring the pressure at the grain breakage point. The damaged starch content of the rice flour was determined using a Megazyme starch damage assay kit. The particle-size distribution of the rice flour was measured as the volume-base distribution using a laser-diffraction particle size analyzer. The mean particle-size distribution of the dry-milled flour obtained was between $65.3{\sim}105.1{\mu}m$ among the rice varieties. The opaque, non-glutinous, Seolgaeng rice demonstrated a narrow peak at the fine size, whereas the entire particle-distribution range for other varieties was wide. Seolgaeng exhibited significantly lower damaged starch content of dry-milled flour than the other varieties (p < 0.05). Seolgaeng showed lowest in energy consumption on rice flour production with 200 mesh particle size. Accordingly, it is possible to produce dry-milled rice flour which is similar to wheat flour that would considerably reduce milling costs.

• 한국약용작물학회지
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• 제25권6호
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• pp.389-396
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• 2017

Background: Panax ginseng C. A. Meyer is wood-cultivated ginseng (WCG) in Korea which depends on an artificial forest growth method. To produce this type of ginseng, various P. ginseng cultivars can be used. To obtain a WCG similar to wild ginseng (WG), this method is usually performed in a mountain using seeds or seedlings of cultivated ginseng (CG) and WG. Recently, the WCG industry is suffering a problem in that Panax notoginseng (Burk.) F. H. Chen or Panax quinquefolium L. are being sold as WCG Korean market; These morphological similarities have created confusion among customers. Methods and Results: WCG samples were collected from five areas in Korea. After polymerase chain reaction (PCR) amplification using the primer pair labeled with fluorescence dye (FAM, NED, PET, or VIC), fragment analysis were performed. PCR products were separated by capillary electrophoresis with an ABI 3730 DNA analyzer. From the results, WCG cultivated in Korea showed very diverse genetic background. Conclusions: In this study, we tried to develop a method to discriminate between WCG, P. notoginseng or P. quinquefolium using simple sequence repeat (SSR) markers. Furthermore, we analyzed the genetic diversity of WCG collected from five cultivation areas in Korea.

• Korean Chemical Engineering Research
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• 제50권6호
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• pp.1043-1048
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• 2012

본 논문에서는 전기이중층 커패시터(EDLC, Electrical Double Layer Capacitor)의 전극소재로 쓰이는 활성탄소의 안정화를 위해 산소함유관능기를 최소화하고 질소함유관능기의 도입을 통해 유기용액계의 전해질을 가지는 EDLC의 축전용량을 개선하는 연구를 하였다. 주사전자현미경(SEM, Scanning Electron Microscopy), 후리에 변환 적외선분광기(FTIR, Fourier Transform Infrared), 자동원소분석기(EA, Elemental Analysis), 보엠(Boehm) 적정법, 충 방전 테스트 등의 분석법을 이용하여 그 결과를 확인하였다. 산 처리를 통하여 산소함유관능기가 도입되고 요소처리를 통하여 질소함유관능기가 도입되었음을 확인하였다. 질소함유관능기 도입을 통하여 EDLC의 g 당 방전용량을 2 mA 상승시켰으며 빠른 속도로 최대 충 방전 성능을 달성하였다. 반면 산소함유관능기는 전해질 속의 전하가 탄소표면에 흡 탈착되는 것을 방해하기 때문에 낮은 방전용량을 보였고, 충 방전 횟수가 늘어남에 따라 방전용량의 큰 감소를 보여주었다.

• 한국치위생학회지
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• 제14권2호
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• pp.281-286
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• 2014

Objectives : The aim of this study is to evaluate the surface changes of enamel specimen, tooth structure by toothpastes in child and adult. Methods : Experimental teeth were collected from extracted human primary teeth. 120 enamel specimens were prepared by cutting the teeth into $2{\times}3{\times}2mm$ blocks using diamond saw and the specimens were assigned to 3 groups. Group 1 was used as control with no treatment. Group 2 was treated with child toothpaste and Group 3 was treated with adult toothpaste on primary enamel surface for 3 minutes daily over 4 weeks. The specimens were immersed into individual container having artificial saliva and the artificial saliva was changed every day. The electron probe micro analyzer(EPMA) provided weight percent(wt%) of calcium(Ca) and phosphorous(P) on enamel surface. The morphology was analyzed by scanning electron microscopy(SEM). Data were analyzed by one-way analysis of variance(ANOVA) and Tukey's test post-hoc test using SPSS(Version 20, SPSS Inc., Chicago, USA). Level of significance was set at 0.05. Results : The surface changes of the primary teeth revealed a significant difference during 4 weeks. Calcium(Ca) and phosphorous(P) levels were found the weight percent difference and a rough enamel surface was seen on SEM after adult toothpaste application. Conclusions : The changes in Ca and P and the morphological surface were affected by the primary tooth treated with adult toothpaste. Enamel surface showed significant differences during 4 weeks.

• 대한토목학회논문집
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• 제43권6호
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• pp.851-863
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• 2023

일정 규모 이상의 공공 건설 프로젝트에 대한 BIM(Building Information Model) 적용이 의무화됨에 따라 입찰단계에서부터 BIM 요구사항에 대한 관련 절차 및 기술에 대한 폭넓은 이해가 요구되고 있다. 그러나 대부분의 중소 시공 및 엔지니어링 기업은 BIM 수행역량이 낮고 관련 기존 업무 프로세스의 BIM 적용에 대한 이해 높지 않아, 입찰 요구사항에 대한 인지가 어렵고 입찰단계의 합리적인 의사결정이 쉽지 않다. 따라서 본 연구는 BIM 입찰문서 용어를 포함한 형태소 분석기를 딥러닝 모델에 결합하여 입찰문서의 BIM 요구사항의 난이도 판별 방법을 제시한다. 제안된 딥러닝 모델의 매개변수 영향이 조사되었으며 예측 결과의 타당성이 검토되었다. 그 결과, 제안된 모델이 시험 데이터에 대해 F1-score 0.83의 성능을 가지며, 모델의 판별 결과 또한 실제 BIM 수행 난이도를 타당하게 반영하고 있음을 보였다.

• Journal of Plant Biotechnology
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• 제31권4호
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• pp.301-306
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• 2004

마늘 (Allium sativum L.) 다신초를 생물반응기를 이용, sucrose 2%가 포함된 MS 배지에서 3주간 증식시킨 후 microbulb의 형성을 위해 NAA 0.1 mg/L와 sucrose 11%가 포함된 MS 배지에서 9주간 배양하였다. 다신초 증식의 경우, 잎을 제거하지 않았을 때 90% 이상이 과수화되었고 과수화 된 신초의 세포는 크기와 형태가 일정하지 않았으며 microbulb의 형성도 이루어지지 않았다. 신초 배양 3주 후 표피의 부정아 세포에서 분열이 활성화되면서 부정아가 비대되었고 신초의 분열조직에서 수층과 병층으로 분열이 일어나 크게 비대된 후 배양 7주부터 microbulb를 형성하였다. Ploidy analyzer를 이용한 배수성 검정에서 다신초와 microbulb의 피크 모두, 모주 식물의 상대적인 피크와 동일한 위치에서 나타나 배수성의 변이가 없는 것으로 나타나 배양체가 모주 식물과 유전적으로 동일함을 입증하였다.

• Food Science and Biotechnology
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• 제18권4호
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• pp.855-860
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• 2009

Physicochemical properties of starches isolated from 3 new potato cultivars developed by Potato Valley Ltd. were investigated and compared to those of starch isolated from 'Superior' being distributed prominently in Korea. Significant differences were observed in physicochemical properties such as granule size, amylose content, phosphorus content, water binding capacity, swelling power, solubility, and in vitro digestibility of starches from different potato cultivars. Thermal properties were evaluated using differential scanning calorimetry (DSC), and onset gelatinization temperatire ($T_o$), peak temperature ($T_p$), and enthalpies of gelatinization (${\triangle}H$) of different potato cultivars ranged as $58.0{\pm}0.3-61.7{\pm}0.4^{\circ}C,\;63.7{\pm}0.2-$ $66.5{\pm}0.0^{\circ}C$, and $15.6{\pm}0.5-17.0{\pm}0.3$ J/g, respectively. Pasting properties were evaluated using a rapid visco analyzer (RVA), and pasting temperature, peak viscosity, and final viscosity of different potato cultivars ranged as $65.0{\pm}0.1-68.9{\pm}0.1^{\circ}C$, $8,163.7{\pm}196.3-9,035.7{\pm}6.4$ cp, and $4,397.7{\pm}166.7-7,025.0{\pm}271.3$ cp, respectively. Especially, 'Gogu valley' starch showed the highest values in the amylose and phosphorus content among tested potato cultivars and higher water binding capacity, swelling power, and solubility than those of other tested starches. And it also showed high pasting temperature, peak viscosity, trough viscosity, and final viscosity as compared to other tested starches.

• 정보처리학회논문지B
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• 제16B권5호
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• pp.427-434
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• 2009

인터넷 및 모바일 환경의 빠른 발전과 함께 신조어나 줄임말과 같은 철자 오류들을 포함하는 텍스트들이 활발히 통용되고 있다. 이러한 철자 오류들은 텍스트의 가독성을 떨어뜨림으로써 자연어처리 응용들을 개발하는데 걸림돌이 된다. 이러한 문제를 해결하기 위해서 본 논문에서는 철자오류 교정사전과 신문기사 말뭉치를 이용한 철자 오류 교정 모델을 제안한다. 제안 모델은 구하기 쉬운 신문기사 말뭉치를 학습 말뭉치로 사용하기 때문에 데이터 구축비용이 크지 않다는 장점이 있다. 또한 교정사전 기반의 단순 매칭 방법을 사용하기 때문에 띄어쓰기 교정 시스템이나 형태소 분석기와 같은 별도의 외부 모듈이 필요 없다는 장점이 있다. 신문기사 말뭉치와 실제 휴대폰에서 수집한 문자 메시지 말뭉치를 이용한 실험 결과, 제안 모델은 다양한 평가 척도에서 비교적 높은 성능(오교정률 7.3%, F1-척도 97.3%, 위양성율 1.1%)을 보였다.

• Applied Microscopy
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• 제38권3호
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• pp.159-165
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• 2008

본 연구는 색상을 함유하고 있지 않은 자연계열의 염모제인 9/00과 14/00을 여성의 건강모발에 염색한 후 염색된 모발을 열분석과 주사전자현미경을 이용하여 모발의 물리 화학적인 변화를 규명하였다. 열분석에서 정상 모발시료의 경우 열에 대한 연소 반응이 비교적 빠르게 나타났으며, 9/00 염색모발의 경우에는 건강모발과 14/00염색 모발의 중간 정도의 연소반응을 나타냈고, 14/00 염색 모발의 경우에는 열에 대한 연소반응이 비교적 느리게 나타나는 것을 확인하였다. 이는 고명도의 염모제일수록 모발의 수분 함유량이 감소되었다는 것을 의미하며, 모발 내부로 침투한 산화물과 염료 분자로 인하여 모발의 화학적 변화가 야기된 것으로 사료된다.

• Restorative Dentistry and Endodontics
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• 제20권1호
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• pp.275-288
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• 1995

The inhibitory effect of cell wall extracts of streptococci, have been investigated to know host-parasite relationship or pathogenesis of abscess formation. Streptococci isolated from the infected root canals were sonicated to get cell wall extracts which have been known as one of the factors of pyogenesis. Lymphocytes separated by density gradient were stimulated with phytohemagglutinin and exposed to cell wall extracts of Streptococcus sanguis, S. mitis, S. uberis, S. mutans (ATCC 10449), and S. faecalis (ATCC 19433). [$^3H$]-thymidine uptake of lymphocytes was analyzed with scintillation counter and lactate dehyrogenase (LD) activity was measured with autochemistry analyzer. S. faeealis had the strongest inhibitory effect. beginning at $100\;{\mu}g/ml$ concentration of sonic extracts. S. sanguis and S. mitis had inhibitory effect at $300\;{\mu}g/ml$, while S. uberis and S. mutans showed no inhibitory, effect on DNA syntheis even at $300\;{\mu}g/ml$. Each streptococci showed different inhibitory effect on the DNA synthesis of lymphocytes, which finding indicated wide spectrum of susceptibility of lymphocytes according to streptococcus spp. There were no significant difference of LD activities between control and each streptococcal extracts. Streptococcal sonic extracts did not affect the morphological findings or number of colonies activated lymphocytes. These finding suggested the inhibitory effect of sonic extract of streptococci to lymphocytes could be detected by DNA synthesis inhibition, not by cellular membrane damage.