• 미생물학회지
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• 제53권3호
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• pp.170-179
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• 2017

차는 세계적으로 인기있는 음료로 불발효차(녹차), 반발효차(우롱차), 완전발효차(홍차)와 흑차(미생물발효차 or 후발효차)를 포함하고 구분된다. 미생물발효차는 차나무(Camellia sinensis)의 잎을 미생물 발효과정을 통해 제조된다. 삼국시대부터 전해 내려온 청태전은 한국 남해안지역에서 제조되며 돈차 또는 떡차로 불리는 독창적인 한국의 미생물발효차이다. 본 연구에서는 청태전에 우점하는 미생물군집구조 분석을 위해 16S rRNA 유전자를 이용하였다. 청태전에 우점하는 미생물은 ${\gamma}$-proteobacteria에 속하는 Pantoea sp.와 Klebsiella oxytoca가 우점하였다. 미생물 군집크기 분석을 통해 청태전의 미생물 군집크기가 다른 미생물발효차와 비교해 가장 큰 것을 확인하였다.

• 대한치과기공학회지
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• 제11권1호
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• pp.71-81
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• 1989

This study was aimed for bettering productivity and technical level of the dental 1 aboratory, and helping the dental technician's benefits and rights, and then endowing them some belonged atmospher and stability on their post by Improving job- satisfaction and maintaining the transferability of one's post at a proper limitation. Therefore, 320 dental technicians extracted randomly from all the technicians working at 494 dental laboratories were subjected for this study. The approach to the study was a way through some postal questionaires executed from March 29, 1988 until May 4, the same year, in which total 254 technicians answered, showing 79% resp"nserate. responserate. The data-analysis was done by a model of the dental technician's transferability from their post, as considering Mobley's(1978)-model of post-transferability, and results through the study are as follows : 1. Satisfaction at a given post showed that the married is better than the unmarried(<0.05), and the experienced is better than the inexperienced(P<0.01). 2. Age, sex, educational experience, and one's service-duration did not affect significantly to the respondent's satisfaction on their post, statistically. 3. Satisfaction at a given post differed in adccordance with given conditions of one's post, i. e.,it stowed high when the monthly payment was good(P<0.05), and when too much duty on their job was given, it was the worst as shown in an example of the next order, too much

• Journal of Forest and Environmental Science
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• 제30권3호
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• pp.277-284
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• 2014

Status of Arbuscular Mycorrhizal (AM) colonization in seven tree species (Albizia saman, Acacia auriculiformis A. Cunn. ex Benth., Albizia lebbeck, Chickrassia tabularis A. Juss., Eucalyptus camaldulensis Dehnn., Gmelina arborea (Roxb) DC, Swietenia macrophylla King.) collected from the hilly areas of Chittagong University (CU) was investigated. Roots and rhizosphere soil samples were collected in different seasons (pre-monsoon, monsoon and post monsoon). Percentage of AM colonization in root and number of spores/100 gm dry soil were assessed. The result of the investigation reveals that the intensity and percentage of AM colonization varied in different forest tree species in different seasons. In this study, maximum AM colonization and spore population were found in pre-monsoon and minimum were in monsoon season. The intensity of colonization was maximum in C. tabularis (74.43%) in pre-monsoon, A. lebbeck (69.45%) in monsoon and S. macrophylla (67.8%) in post monsoon seasons and minimum in A. auriculiformis (53.75%) during pre-monsoon, A. saman (24.4%) in monsoon and A. saman (19.36%) in post monsoon. The number of spores found per 100 g dry soil ranged between 164-376 during pre-monsoon, 27-310 during monsoon and 194-299 in post monsoon season. Out of six recognized genera of AM fungi, Glomus, Sclerocystis, Entrophospora, Scutellospora, Acaulospora and other unidentified spores were observed.

• 한국정보통신학회논문지
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• 제6권5호
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• pp.689-695
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• 2002

막질의 조성은 공정 개발과 고품질 생산 적용을 위한 반도체 소자의 제조에 있어서 풍요한 요소의 하나 이다. 막의 표면과 계면의 조성은 기본적으로 AES측 통하여 알 수 있다. 본 연구에서는 온도, DCS post flow, shower head life time 등과 같은 공정조건으로 LPCVD법을 이용한 tungsten suicide 박막을 증착하고 이들의 구조적, 전기적 특성과 조성비를 측정하며 WSix박막을 해석하였고 이로부터 Si/W의 조성비를 비교하였다. Si와 W의 조성비는 DCS post flow에 의하여 WSix박막의 표면에서 증가하였으며, 폴리실리콘과 tungsten silicide 계면에서는 온도의 증가에 따라 조성비가 증가함을 알 수 있었다. 이 결과는 메모리 소자 제조의 WSix 박막 증착의 공정조건 최적화에 적용될 수 있다.

• 한국수정란이식학회지
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• 제13권1호
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• pp.11-19
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• 1998

This study was to determine the effect of ionomycin and 6-dimethylaminopurine (6-DMAP) and/or elcetrical stimulation on the oocyte activation and production of rabbit nuclear transplant embryos. The oocytes were collected from the oviduct of superovulated rabbits at 14 h post hCG injection and cultured in TCM-199 containing 10% FBS until 19 h post hCG injection. To determine the optimum concentration and exposure time of 6-DMAP, some oocytes were activated with 5 $\mu$M ionomycin for 5 min and then in 2.0 mM 6-DMAP for 0.5 to 3.0 h, or in 1.0 to 3.0 mM 6-DMAP for 2.0 h. Other control oocytes were stimulated electrically(3X, 1.25 kV/cm, 60 $\mu$sec) in 0.3 M mannitol solution supplemented with 100 $\mu$M CaCl$_2$ and MgCl$_2$. The nuclear donor embryos of 8-cell stage were synchronized to G$_1$ phase of 16-cell stage, and the recipient cytoplasms were obtained from removal of the first polar body and a portion of membrane bound cytoplasm of the oocytes collected at 15 h post hCG injection. A separated blastomere was injected into the perivitelline space of the enucleated oocytes. The oocytes injected with nucleus were cultured until 19 h post hCG and then electrofused and activated by electrical stimulation with or without ionomycin and 6-DMAP. These nuclear transplant embryos were cultured in TCM-199 containing 10% FBS in 39˚C, 5% CO2 incubator for 120 h. For the oncytes activated parthenogenetically with electrical stimulation with or with-out ionomycin and the various concentration of exposure time of 6-DMAP, the highest cleavage(92.3%) and development to blastocyst stage(41.0%) were resulted from the oocytes activated by ionomycin and 2.0 mM 6-DMAP for 2.0 h, which were found to be significantly(P<0.05) higher than the cleavage(45.2%) and developement to blastocyst stage(14.3%) from the oocytes activated with electrical stimulation. The significantly(P<0.05) more oocytes(71.4%) developed to 4 cell stage at 24 h post activation by ionomycin and 6-DMAP than those by electrical stimulation(18.9%). For the nuclear transplant embryos, the cleavage rate was similarly high in oocyte activation by electrical stimulation with(79.4%) or without ionomycin and 6-DMAP(70.5%). However, the embryo development to blastocyst stage was significantly(P<0.05) higher in oocyte activation by electrical stimulation with ionomycin and 6-DMAP(44.4%) than by electrical stimulation only(25.0%). The significantly(P<0.05) more nuclear transplant embryos(45.6%) developed to 4 cell stage at 18 h post activation by electrical stimulation with ionomycin and 6-DMAP than those by electrical stimulation only(10.6%). These results indicated that the supplemental oocyte activation by ionomycin and 6-DMAP with electrical stimulation enhanced and accelerated the preimplanted in vitro development of the rabbit nuclear transplant embryos.

• 대한약리학회지
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• 제32권2호
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• pp.201-209
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• 1996

Restoration of the blood flow after a period of ischemia is accompanied by generation of toxic oxygen radicals. This phenomenon may account for the occurrence of reperfusion-mediated tissue injury in ischemic hearts. In in vitro studies, although oxygen radicals can be generated from a variety of sources, including xanthine oxidase system, activated leucocytes, mitochondria and others, the most important source and mechanism of oxygen radical production in the post-ischemic reperfused hearts is unclear. In the present study, we tested the hypothesis that the respiratory chain of mitochondria might be an important source of oxygen radicals which are responsible for the development of the reperfusion injury of ischemic hearts. Langendorff-perfused, isolated rat hearts were subjected to 30 min of global ischemia at $37^{\circ}C$, followed by reperfusion. Amytal, a reversible inhibitor of mitochondrial respiration, was employed to assess the mitochondrial contributions to the development of the reperfusion injury. Intact mitochonria were isolated from the control and the post-ischemic reperfused hearts. Mitochondrial oxygen radical generation was measured by chemiluminescence method and the oxidative tissue damage was estimated by measuring a lipid peroxidation product, malondialdehyde(MDA). To evaluate the extent of the reperfusion injury, post-ischemic functional recovery and lactate dehydrogenase(LDH) release were assessed and compared in Amytal-treated and -untreated hearts. Upon reperfusion of the ischemic hearts, MDA release into the coronary effluent was markedly increased. MDA content of mitochondria isolated from the post-ischemic reperfused hearts was increased to 152% of preischemic value, whereas minimal change was observed in extramitochondrial fraction. The generation of superoxide anion was increased about twice in mitochondria from the reperfused hearts than in those from the control hearts. Amytal inhibited the mitochondrial superoxide generation significantly and also suppressed MDA production in the reperfused hearts. Additionally, Amytal prevented the contractile dysfunction and the increased release of LDH observed in the reperfused hearts. In conclusion, these results indicate that the respiratory chain of mitochondria may be an important source of oxygen radical formation in post-ischemic reperfused hearts, and that oxygen radicals originating from the mitochondria may contribute to the development of myocardial reperfusion injury.

• International Journal of Internet, Broadcasting and Communication
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• 제15권2호
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• pp.157-167
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• 2023

As a new trend in the development of urban public spaces, the use of right-angle LED screens perfectly combines building facades with naked-eye 3D visual effects, providing designers with a brand-new creative platform. How to create a realistic naked-eye 3D effect on a right-angle LED screen and bring an immersive visual experience to the audience has become a question worth exploring. So far, production companies have yet to announce the relevant design ideas and complete production methods. In order to explore the production principle and production process of the naked-eye 3D effect of the right-angle LED screen, we summarize the basic production principle of the naked-eye 3D impact of the right-angle LED screen through case analysis. Based on understanding the production principle, the actual case production test was carried out, and a complete production process of the naked eye 3D visual effect of the right-angle led screen was tried to be provided by off-line rendering. For the problem of how to deal with image deformation, we provide two production methods: post-production software correction and UV mapping. Among them, the UV mapping method is more efficient and convenient. Referring to this paper can help designers quickly understand the production principle of the naked eye 3D effect of right-angle LED screens. The production process proposed in this paper can provide a reference for production method for related project producers.

• 한국가금학회지
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• 제29권4호
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• pp.237-241
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• 2002

산란노계에서 강제환우가 체중, 복강지방, 장기, 근육조직의 변화에 미치는 영향을 고찰하고자 77주령 산란계 360수를 7주간 강제환우를 시행하였다. 강제환우전, 산란율 5%, 산란피크, 실험종료 시기인 126주령에 단계별로 각각 36수씩 희생시킨 후에 체중, 복강지방, 장기 및 번식기관의 길이와 무게를 조사하였으며, 가슴과 다리근육에서 지방함량을 분석하였다. 체중은 산란 5% 시기에 제일 낮았으며 산란율이 증가하면서 실험 종료시기에 극대화되었다. 복강지방도 체중의 변화와 비슷한 경향을 보였다. 간의 체중에 대한 비율도 강제환우 후에 제일 낮았지만 실험 종료시에 현저하게 높았다(P<0.05). 심장과 근위의 무게는 산란율이 5%에 도달하였을 때 제일 높았지만, 그 후에는 강제환우 이전과 동일한 경향을 보였다. 산란율이 5%에 도달한 시점에서 장기와 번식기관의 무게는 다른 시기에 비하여 현저하게 낮았지만 산란율이 높아지면서 그 무게가 증대되었으며 실험 종료시에 제일 높게 나타났다(P<0.05). 가슴과 다리근육의 지방함량도 산란율이 5% 도달시에 제일 낮게 나타났으며, 실험 종료시에 현저하게 높았다(P<0.05). 본 실험의 결과 산란노계에서 강제환우 전후시기에 체중, 장기, 근육의 변화의 주요 원인은 주로 복강지방과 다른 장기 및 근육에서 지방의 함량감소에 기인하였음을 확인하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제15권6호
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• pp.890-894
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• 2002

The accuracy of the gamma function to describe lactation curve of Yankasa ewes was investigated using milk production data obtained from 168 ewes with either complete or incomplete 84 day lactation records. Ewes were daily hand milked after over-night separation from lamb and thorough disinfection of the udder. The daily milk yield on the average was estimated from the weekly total yield. The effect of type of birth, parity, season of birth and lactation length on the components of lactation curve (a, b, c and s) were analysed by least-square procedures. All factors except parity significantly (p<0.01) influenced the curve parameters. The goodness of fit of the function did not differ between the two classes of varying duration of lactation; incomplete lactation however, showed a lower persistency and as expected lower level of production. Correlations ($r_p$) between lamb weight gain and milk yield using the weight records from lamb weighed at weekly intervals indicated a high and positive relationship in the early lactation that decreased in intensity as the lactation advanced.

• 한국엔터테인먼트산업학회논문지
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• 제13권2호
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• pp.1-12
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• 2019

최근 십여 년 사이에 급속도 발전한 스마트폰 카메라의 성능과 전 세계적으로 높아진 보급률을 기반으로 스마트폰 영화제작을 통한 다양한 국제 교류의 가능성을 연구해 볼 것이다. 정부와 자본 중심의 교류, 단순한 영화제작교육 이라는 목표에서 벗어나 민간 중심의 문화 교류에 방향성을 두고자 한다. 2017년 11월 17일부터 22일까지 진행된 <한국-베트남 영화제>의 부대행사로 <스마트폰 영화 워크숍>이 열렸다. 영화제 기간 내에 3일 동안 진행된 워크숍으로 한국의 영화감독과 베트남의 영화학도들 간의 국제 협업 프로젝트로 주목을 받은 행사였다. 본 연구자는 이 워크숍의 멘토로 참여하여 실무중심의 연구를 진행하였다. 워크숍의 팀 구성과 시나리오, 촬영장비, 일정 등 한국에서의 Pre production부터 현지에서 작품을 완성하고 상영에 이르기까지 Production, Post production의 전 과정을 단계별로 짚어보았다. 직접 경험한 국제 워크숍 교류 사례 분석을 통해 시행착오와 개선방안 등을 모색하고 나아가 문화교류의 성과와 향후 기대 효과에 대해서도 가늠해 볼 것이다. 이 경험적 실무 사례연구를 참고삼아 국제 워크숍 교류가 활발히 이루어지기를 기대한다.