• 지역연구
• /
• 제34권1호
• /
• pp.61-75
• /
• 2018

도시재생에 관한 연구는 2006년 이래로 10년이 넘는 기간 동안 활발히 진행되어오고 있다. 지금까지 많은 도시 재생사업 효과를 분석하기 위한 연구가 진행되고 있으나 대부분 정성적인 방법에 치우쳐 있다. 따라서 본 연구는 다양한 상업지역 도시재생사업이 진행 중에 있는 청주시 중앙동을 중심으로 도시재생사업의 효과를 정량적으로 분석하는 데 그 목적이 있다. 이를 위하여 유동인구, 공시지가 공실률을 도시재생사업 효과 분석 지표로 선정하였다. 분석시점은 도시재생의 효과가 본격적으로 나타나기 시작한 2013년을 기점으로 2011년부터 2016년까지이다. 분석결과, 첫째, 유동인구는 차츰 증가하다가 프로젝트가 활발히 진행되던 2014년에 약 65퍼센트의 증가율을 보였다. 둘째, 공시지가는 도시재생이 시작한 2011-2012 시점에 가장 큰 증가 폭을 보였고 2015년까지 증가폭이 점차 줄어들면서 2015-2016년에는 미세한 감소를 보였다. 마지막으로 공실률은 꾸준한 하향곡선을 그리며 27퍼센트에서 12퍼센트로 약 15퍼센트포인트가 감소하였다. 본 연구는 상업지역의 도시재생 효과를 정량적으로 분석한데서 학술적인 의의를 찾을 수 있다.

• 한국자동차공학회논문집
• /
• 제6권6호
• /
• pp.72-79
• /
• 1998

The goals of this research are to understand the regeneration characteristics in diesel particulate filter(DPF) using the cerium additive and throttling. The effects of throttling duration and spring tension of throttling valve were studied. Measurements were made on a 6 cylinder direct injection diesel engine and included pressure drop, filter inlet temperature, oxygen concentrations, and torque. The major conclusions of this work include; (i) the pressure drop is increased with increase of the engine load and the engine speed; (ii) the inlet temperature of the filter is reached $350^{\circ}C$ with certain engine operating condition which leads to sufficient temperature to regenerate with additive; and (iii) oxygen concentrations in the filter and engine torque during throttling operation are decreased by 2 percent and 36 percent, respectively, which are not critical about regeneration and vehicle operation.

• 한국약용작물학회지
• /
• 제14권5호
• /
• pp.293-298
• /
• 2006

Optimum culture conditions for high frequency plant regeneration from leaf explants of Kalanchoe daigremontiana Hamet &Perrier were established. Shoot regeneration was achieved from leaf explant cultures using MS medium supplemented with indole-3-acetic acid (IAA) and thidiazuron (TDZ) or benzyladenine (BA). Percent regeneration was influenced by plant growth regulators and source of explants. MS medium supplemented with TDZ (1.0 mg/l) and IAA (0.4 mg/l) was the most effective, providing shoot regeneration for 76.7 % of ex vitro leaf explants associated with a high number of shoots per explant (9.5 mean shoots per explant), whereas 100% shoot regeneration associated with 12.4 shoots per explant occurred from in vitro leaf explants on the same medium. Clusters of shoots were multiplied and elongated on MS medium containing several concentrations of BA. MS medium supplemented with 0.25 mg/l BA was proved as the most effective shoot elongation medium. Elongated shoots (2-3 cm) were rooted at 100% on half-strength MS medium. Rooted plantlets were then transferred to potting soil. Regenerated plants were established in the soil with 90% success.

• The Plant Pathology Journal
• /
• 제16권5호
• /
• pp.257-263
• /
• 2000

Infection with rice blast fungus (Magnaporthe grisea) significantly reduced foliar net photosynthesis (A) of rice cultivars: Ilpoom, Hwasung, and Choochung in greenhouse experiments. By measuring the amount of diseased leaf area with a computer image analysis system, the relation between disease severity (DS) and net photosynthetic rate was curvilinearly correlated (r=0.679). Diseased leaves with 35% blast symptom can be predicted to have a 50% reduction of photosynthesis. The disease severity was linearly correlated (r=0.478) with total chlorophyll (chlorophyll a and chlorophyll b) per unit leaf area(TC). Light use efficiency was reduced by the fungal infection according to the light response curves. However, dark respiration (Rd) did not change after the fungal infection (p=0.526). Since the percent of reduction in photosynthesis greatly exceeded the percent of leaf area covered by blast lesions, loss of photosynthetic tissue on an area basis could not by itself account for the reduced photosynthesis. Quantitative photosynthetic reduction can be partially explained by decreasing TC, but cannot be explained by decreasing Rd. By photosynthesis (A)-internal CO$_2$ concentration (C$_i$ curve analysis, it was suggested that the fungal infection reduced ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity, ribulose-1,5-bisphosphate (RuBP) regeneration, and inorganic phosphate regeneration. Thus, the reduction of photosynthesis by blast infection was associated with decreased TC and biochemical capacity, which comprises all carbon metabolism after CO$_2$ enters through the stomata.

• Journal of Periodontal and Implant Science
• /
• 제29권4호
• /
• pp.963-979
• /
• 1999

This study examined ribotypes of 36 P. gingivalis strains isolated from 10 rapidly progressive periodontitis patients in Korean and revealed the presence of genetic heterogeneity among the patients. Ribotyping was performed by using a oligonucleotide probes based on 16S rRNA after whole genomic DNA had been digested with the restriction endonuclease enzyme Kpn I and Pst I. In addition, the antigenic heterogeneity of fimbrillin and protease activity was analysed to observe the virulency of P. gingivalis. The results were as follows. 1. Using KpnI, 6 ribotypes were detected, whereas 7 ribotypes were identified by using PstI. When combined two enzymes, a total of 8 ribotypes was subgrouped. 2. Ribotype I/e was the most common and detected in 4 among 10 patients. 3. The fimbrillin expressed from P. gingivalis isolates had the molecular size of 41kDa, 43kDa, 49kDa. It was observed that the size of fimbrillin with the same ribotypes could be identical. 4. All the P. gingivalis strains showed strong proteolytic activity and had the molecular size more than 120kDa. In summary, total 8 ribotypes were observed for isolates from rapidly progressive periodontitis patients. Forty percent of the patients harbored isolates exhibiting the same ribotype I/e, and it was observed that more than one ribotype can coexist in an individual patient.

• 한국동물학회지
• /
• 제27권4호
• /
• pp.221-230
• /
• 1984

Wistar계 흰쥐 간의 약 70%를 절제한 후 재생중인 나머지 간의 microsome에서 lipid peroxidation과 약물 대사효소중 특징적인 aminopyrine demethylase의 활성도를 측정하고 NADPH-cytochrome c reductase, glutathione peroxidase의 활성도와 cytochrome P-450의 함량을 측정하였다. Aminopyrine demethylase의 활성도는 재생 제1일에 최저치를 나타냈으며 재생이 진행될수록 정상인 수준으로 증가하였고 lipid peroxidation, NADPH-cytochrome c reductase, cytochrome P-450의 함량 역시 재생초기에 급히 감소하여 재생2일에 가장 낮은 값을 나타내며 점차 정상인 수준으로 증가하여 7일 이후에는 정상치에 도달하였다. Glutathione peroxidase의 활성도는 재생중인 간이나 정상인 개체의 간에서 별다른 차이가 없었다. 이것은 재생중인 간에서 재생초기에 cytochrome P-450의 함량과 NADPH-cytochrome c reductase의 활성도 감소가 lipid peroxidation과 약물 대사효소의 활성도 감소를 일으키며 이러한 현상은 부분 간 절제 후 7일 이후에는 거의 나타나지 않았다.

• 환경위생공학
• /
• 제14권2호
• /
• pp.84-89
• /
• 1999

This experiment was performed to develop the new desulfurization process which can eliminate the possibility of generation of the secondary pollutants by regenerating the limestone from the sulfite/sulfate slurry generated from the wet lime/limestone flue gas desulfurization process by treating it with the ammonium hydroxide and carbon dioxide and using it again. In the experiments, regent grade calcium carbonate was dissolved to obtain the 200ml of sample slurry of the concentration of 2.0~0.4 weight percent. After three times of regeneration and desulfurization process, the coefficients of regeneration and desulfurization efficiencies are calculated/measured. The obtained results are that the coefficients of generation of the first. second, and third regenerated calcium carbonate were 90.88, 92.13, and 91.50%, respectively; and the desulfurization efficiencies of those are 93.4, 94.2 and 93.0%, respectively.

• 한국초지조사료학회지
• /
• 제22권4호
• /
• pp.273-278
• /
• 2002

이탈리안 라이그라스 (Lolium multinorum Lam.)와 톨페스큐 (Festuca arundinacea Schreb.)의 속간 교잡종 3계통에 대한 약 배양을 실시하여 약 유래의 식물체를 생산하였다. MS 기본배지에 sucrose 30 g/$\ell$, NAA 2 mg/$\ell$, kinetin 1 mg/$\ell$을 첨가한 캘러스 유도배지에서 배양 20일만에 약 유래의 캘러스를 유도하였다. 캘러스 유도율은 평균 11.6%였으며, 캘러스의 크기는 평균 9.1 mg/callus/anther 였다. MS 기본배지에 sucrose 30 g/$\ell$ , NAA 1 mg/$\ell$, kinetin 2 mg/$\ell$을 첨가한 재분화 배지에 캘러스를 치상하여 배양 50일만에 완전히 재분 화된 식물체를 얻었으며, 캘러스로부터 식물체로 재분화 되는 비율은 평균 27.1%였고, Hyb-1 계통의 식물체 재분화율이 30.2%로서 가장 높았다.

• 한국동물학회지
• /
• 제14권4호
• /
• pp.199-204
• /
• 1971

放射線照射에 의해서 尿 및 血液內에 다량의 deoxycytidine (CdR)이 流出하는 것을 볼수가 있는데, 이것이 DNA의 合成이나 分解와 어떤 관련성이 있으며, 아울러 어느 臟器의 DNA가 放射線感受性이 큰지의 여부를 밝히기 위해서 400R의 X 線을 흰쥐에 全身照射시켜, 간, 지라 및 흉선을 切除하여 均質化시킨 후, CdR-2-$^14 C$을 써서 DNA의 合成率 및 分解率을 測定하였다. DNA의 合成率은 흉선의 경우, 照射후 1 $\\sim$ 3日에 가장 심한 抑制現象이 나타났으며 5日후 부터는 점차 回復됨을 볼 수 있었고, 한편 간과 지라의 경우는 抑制의 정도가 흉선에 비해서 적었으며 回復도 훨씬 빨리 이루어졌다. DNA의 分解率은 지라와 흉선의 경우 비슷하여서 照射후 1日에 영향이 極大로 나타냈으며 回復도 아주 늦게 일어남을 볼 수 있었는데 반해서, 간의 경우는 分解도 덜 일어났으며 回復도 아주 빨리 일어남을 알 수 있었다. 이와 같은 결과는 각종 臟器의 放射線感受性의 차와 再生能의 차에 의해서 나타나는 현상임을 알 수 있고 CdR의 流出量의 增加는 放射線에 의한 DNA合成의 抑制와 DNA分解의 促進의 두가지 요인에 기인하는 것으로 추정되었으며, 전자의 경우는 흉선이, 후자의 경우는 지라와 흉선이 같은 정도의 重要性을 지니고 있음을 알 수 있었다.

• Molecules and Cells
• /
• 제23권3호
• /
• pp.323-330
• /
• 2007

The mature wheat embryo is arguably one of the best explants for genetic transformation because of its unlimited availability and lack of growth season restriction. However, an efficient regeneration system using mature wheat embryos (Triticum aestivum L.) is still not available. To identify genes related to the tissue culture response (TCR) of wheat, QTLs for callus induction from mature embryos and callus regeneration were mapped using an RIL population derived from the cross of 'Wangshuibai' with 'Nanda2419', which has a good TCR. By whole genome scanning we identified five, four and four chromosome regions conditioning, respectively, percent embryos forming a callus (PEFC), percent calli regenerating plantlets (PCRP), and number of plantlets per regenerating callus (NPRC). The major QTLs QPefc.nau-2A and QPcrp.nau-2A were mapped to the long arm of chromosome 2A, explaining up to 22.8% and 17.6% of the respective phenotypic variance. Moreover, two major QTLs for NPRC were detected on chromosomes 2D and 5D; these together explained 51.6% of the phenotypic variance. We found that chromosomes 2A, 2D, 5A, 5B and 5D were associated via different intervals with at least two of the three TCR indexes used. Based on this study and other reports, the TCRs of different explant types of wheat may be under the control of shared or tightly linked genes, while different genes or gene combinations may govern the stages from callus induction to plantlet regeneration. The importance of group 2 and 5 chromosomes in controlling the TCRs of Triticeae crops and the likely conservation of the corresponding genes in cereals are discussed.