• Food preservation and processing industry
• /
• v.7 no.1
• /
• pp.45-53
• /
• 2008

흑마늘의 이화학적 성분의 변화 및 항산화 활성에 대한 연구를 분석한 결과, 흑마늘의 색은 제조공정을 거치면서 L, a 및 b값이 모두 감소하였는데 내부색의 경우 가공 초기에 크게 감소하였다. 수분은 가공 중 계속해서 감소하였고, pH도 점차 산성화되어 가공이 끝난 시료에서 pH $4.22{\pm}0.02$였다. 총 페놀 화합물과 플라보노이드는 1단계시료에 비해 최종단계에서 각각 약 1.9배, 2.6배 증가하였다. Total pyruvate와 thiosulfinate도 비슷한 패턴으로 각각 약 1.6배, 5.8배 증가하였다. 유리당 중 가장 함량이 높은 fructose는 1단계에서는 $1,403.03{\pm}6.24\;mg/100\;g$ 였던 것이 4단계에서는 $2,454.45{\pm}4.20\;mg/100\;g$으로 증가하였으나, 반면에 이당류인 sucrose와 maltose는 흑마늘의 숙성과 더불어 서서히 감소하는 경향이다. 흑마늘의 구성아미노산은 glutamic acid의 함량이 가장 많았고, 다음으로 proline과 aspartic acid였으며, 유리아미노산은 taurine, homocysteine 및 $\delta$-hydroxylysine은 1단계 혹은 2단계 시료에서는 검출되지 않았으나, 2단계 혹은 3단계 이후시료에서 미량 검출되었다. 흑마늘 가공중 물추출물과 에탄올 추출물의 DPPH에 대한 전자공여능은 숙성이 진행될수록, 추출물의 첨가 농도를 높일수록 점차 증가하여 4단계 시료의 $1,000\;{\mu}g/mL$ 농도에서 에탄올 추출물은 $45.63{\pm}0.43%$, 물추출물은 $67.40{\pm}0.21%$로 시험된 시료 중 가장 높은 활성을 보였다. 환원력은 100 및 $500\;{\mu}g/mL$ 농도에서 1, 2단계 시료를 제외한 모든 시료에서 물추출물이 에탄올 추출물 보다 높은 활성을 보였다.

• Development and Reproduction
• /
• v.10 no.1
• /
• pp.9-17
• /
• 2006

The cycle of the seminiferous epithelium and morphological features of spermatids in Crocidura dsinezumi were studied by light microscopy. The cycle of the seminiferous epithelium was divided into 12 stages. The dark type of spermatogonium(Ad) is appeared in all stages, and intermediate(In) in stage IV and B spermatogonium in stage V and VI were observed. The development of the acrosomal system, and changes in nuclear morphology of spermatids were divided into 14 steps. The Golgi, cap, acrosomal, maturation and spermiation phases were observed during steps $1{\sim}2$, steps $3{\sim}6$, steps $7{\sim}10$, steps $11{\sim}13$, and step 14, respectively. Our results provide the foundation for future studies of the spermiogenesis of Crocidura dsinezumis.

• Journal of IKEEE
• /
• v.18 no.4
• /
• pp.456-462
• /
• 2014

Scintillators were polished in four steps using polishing paper, to reduce the optical loss occurring at their cross section when radiation detectors are fabricated with plastic scintillators. We studied the correlation between the polishing steps and detection efficiency and assessed the detection characteristics that are dependent in the polishing steps. Our results showed that the detection efficiency increased by approximately 7.75 times for a detector that used a scintillator polished in four steps, compared to a detector that used an depolished scintillator. For detectors fabricated using scintillators polished in different steps, better detection characteristics were obtained in terms of the activity, distance, and location of radiation, compared to detectors fabricated with an depolished scintillator.

• Journal of the Korean Society for Railway
• /
• v.19 no.5
• /
• pp.663-671
• /
• 2016

This paper investigates how to change passengers' preferences for express trains according to line extension in Seoul Metro Line 9. Before-and-after line extension, we traced passengers' path choices using Smart Card data via the method suggested by Kim et al. (2015). We developed two multinomial logit models before-and-after line extension. Transferability test showed that there is no difference between the two models. However, the load factor of the express train increased by 6.7% and the gap between the local and express trains became significantly wider.

• Journal of Embryo Transfer
• /
• v.17 no.1
• /
• pp.61-65
• /
• 2002

This study was carried out to study the viability of oocytes when vitrified at various maturation stages. Bovine cumulus-oocyte complexes were recovered from ovaries at a slaughter and then divided into five groups: control group(unvitrified oocytes), 0 hr. group(composed of oocytes vitrified before the onset of maturation) and 10, 14, and 20 hrs groups(vitrified at 10, 14 and 20 hrs after the onset of maturation, respectively). The oocytes remained vitrified for 24 hrs, and then were thawed in 3$0^{\circ}C$. Survival and cleavage rates were investigated by results of in vitro culture and aceto-orcein staining or FDA test. No difference in the incidence of diploid oocytes was observed among the control, non-vitrified group(3.6%) and oocytes vitrified at 14 hrs(6.7%) or 20 hrs(1.7%). However, more diploid oocytes were detected after vitrification at 0 hr.(26.7%) and 10 hrs(21.7%) post maturation. The survival rate of all vitrified immature oocytes(12.0~38.0%) was low, 48.0% of unvitrified oocytes and oocytes vitrified before maturation or 0~ 10 hrs after the onset of maturation were higher than that of other groups. The overall fertilization and cleavage rates of vitrified immature oocytes (32.3 ~ 64.6% and 4.6 ~ 32.3%) were low, and 55.0% of unvitrified oocytes and the rate of immature oocytes were very higher than that of mature oocytes.

• Proceedings of the Plant Resources Society of Korea Conference
• /
• 2020.08a
• /
• pp.60-60
• /
• 2020

본 연구는 수확 단계에 따른 작약 주요 품종의 수확후 품질 특성을 조사하여 품종별 적정 수확 시기를 구명하고자 수행하였다. 절화 작약은 '두체스', '레드참', '보울오브크림' 품종을 사용하였으며, 세 품종 모두 1, 2, 3, 4단계로 구분 지어 수확하여 실험에 사용하였다. 수확한 작약은 40cm로 재절단하여 chrysal professional III 용액이 담긴 화병에 꽃아 생체중, 증산량, 수분흡수량, 개화 단계 변화 등을 매일 조사하였고, 이를 통해 수분균형 및 절화 수명 등의 결과를 도출하였다. '두체스' 품종의 품질 특성 변화를 조사한 결과, 1단계에 수확한 절화의 만개소요일수는 5.5일, 만개유지일수는 2.9일, 총 절화수명은 8.4일로 다른 수확단계보다 1~3일 더 긴 것으로 조사되었으며, 생체중증가율 및 화경 변화 결과를 통해 1단계 수확 시에도 개화는 정상적으로 진행되는 것을 확인할 수 있었다. '레드참' 품종의 품질 특성 변화 조사 결과, 1단계에 수확한 절화의 만개소요일수는 7.9일, 만개유지일수는 3.3일, 총 절화수명은 11.2일로 다른 수확단계보다 1~4일 더 긴 것으로 조사되었다. '보울오브크림' 품종의 품질 특성 변화 조사 결과, 1단계 수확한 절화는 30% 수준만 만개하여 조기 수확에 따른 문제점이 확인되었지만, 2단계 수확한 절화는 개화와 만개 모두 100% 진행되었으며, 만개소요일수는 6.4일, 만개유지일수는 4.5일, 총 절화수명은 10.9일로 다른 수확단계보다 1~2일 긴 것으로 조사되었다. 본 연구 결과, '두체스' 와 '레드참' 품종의 적정 수확단계는 1단계, '보울오브크림' 품종의 적정 수확단계는 2단계가 적절할 것으로 판단된다.

• Journal of Intelligence and Information Systems
• /
• v.22 no.4
• /
• pp.217-245
• /
• 2016

The purpose of this study is to verify how 7 sentiment domains extracted through sentiment analysis from social media have an influence on business performance. It consists of three phases. In phase I, we constructed the sentiment lexicon after crawling 45,447 pieces of VOC (Voice of the Customer) on 26 auto companies from the car community and extracting the POS information and built a seven-sensitive domains. In phase II, in order to retain the reliability of experimental data, we examined auto-correlation analysis and PCA. In phase III, we investigated how 7 domains impact on the market share of three major (GM, FCA, and VOLKSWAGEN) auto companies by using linear regression analysis. The findings from the auto-correlation analysis proved auto-correlation and the sequence of the sentiments, and the results from PCA reported the 7 sentiments connected with positivity, negativity and neutrality. As a result of linear regression analysis on model 1, we indentified that the sentimental factors have a significant influence on the actual market share. In particular, not only posotive and negative sentiment domains, but neutral sentiment had significantly impacted on auto market share. As we apply the availability of data to the market, and take advantage of auto-correlation of the market-related information and the sentiment, the findings will be a huge contribution to other researches on sentiment analysis as well as actual business performances in various ways.

• The Korean Journal of Zoology
• /
• v.7 no.1
• /
• pp.33-38
• /
• 1964

한국산 도롱뇽 (Hynobius leechi BOULENGER) 발생배의 질소화합물의 대사를 연구하고져 발생단계에 따른 단백질구성(아미노) 산의 촉진(아미노) 산의 정성적 분석과 질소 배설물(ammonia, urea, uric acid, creatine and/or creatinine, total nitrogen)의 정량분석을 미수정란, 란할배, 포배, 양배, 신경배 및 부화직전의 배에 대하여 행하였다. 1. 발생단계에 따른 발생배내 단백질구성 (아미노산)은 전 단계를 통하여 일양하게 18종씩 검출되어TRh 유리 (아미노산) 은 17 내지 23 종 검출되었으며, 전체적으로 유리(아미노산) 분포상에 큰 변화가 없었다. 2. 발생단계에 따른 질소배설물 분석의 결과는 다음과같다. Ammonia 와 urea 의 배내 함량은 미수정란에서부터 양배까지 점차 감소하여 양배 이후 부화직전배까지 급격히 증가한다. Uric acid의 함량은 전 단계를 통해 미소하였으며 creating and/or creatininie 은 본 실험에서는 검출되지 않았다. 3. 발생단계에 따른 발생배내 ammonia 함량에 대한 sodium azide의 영향은 농도에 따라 이원적인 특이성을 가지고 있었다.

• The Korean Chronic Disease News
• /
• no.13
• /
• pp.7-7
• /
• 1981

• Korean Journal of Environment and Ecology
• /
• v.29 no.4
• /
• pp.533-538
• /
• 2015

This study was conducted to examine the effect of salinity on the early embryonic development stage of boreal digging frogs (Kaloula borealis). An experiment was carried out with the eggs of K. borealis mating couples laid along the coastal zone of Jeju Island in June 2013. The salinity was set to 0, 1, 3, 5, and 7 ‰, respectively. The survival and growth of the larvae at various stages from the egg phase to the closing of their external gills phase were observed. In another experiment, tadpoles in internal gill stage were placed in solutions with salinity of 0, 1, 3, 5, and 7 ‰, respectively, and their survival rate and growth rate were observed, and then the results of the two experiments above were compared. The results showed that in egg and external gill stage, there was no significant difference in survival rate in 3 ‰ solution, though there was low survival rate in 5 ‰ solution. Further, all the eggs were dead in 7 ‰ solution, so it appeared that solutions with salinity of 5 ‰ or higher affect the survival of K. borealis in the early embryonic development. Larvae in the internal gill stage showed no significant difference in survival rate from the control group up to a salinity of 5 ‰, but when placed in a solution of over 7 ‰ salinity, the survival rate decreased. The growth rate also slowed down with the higher salinity. It appeared that in both the external gill stage and the internal gill stage in 5 ‰ solution, the growth rate decreased significantly compared to the control group. From this study it is concluded that higher salinity values have a significant impact on the survival and growth of the K. borealis larvae and this finding can be used to conserve K. borealis species that are decreasing in number due to the side effects of development in coastal areas.