• Smart Structures and Systems
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• 제14권3호
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• pp.367-376
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• 2014

Ambient vibration techniques are nowadays a very popular tool to assess dynamic properties of buildings. Due to its non destructive character, this method is particularly valuable, especially for health monitoring of historical monuments. The present ambient vibration experiment consists on the evaluation of vibration modes of a Medieval tower. Situated in Soncino (close to Cremona, in the Northern Italian region named Lombardia), the tower of 41.5 meters height has been monitored by seismometers located at different points inside the structure. Spectral ratios of the recorded ambient vibrations clearly identify a fundamental mode at about 1 Hz, with a slight difference in the two horizontal components. A second mode is also evidenced at approx 4-5 Hz, with a moderate degree of uncertainty. The records of a ML 4.4 earthquake, occurred during the monitoring period, confirm the information obtained by microtremor analysis. Daily variations of both 1st and 2nd mode were detected: these variations, of an amount up to 2%, seem to be well related with the temperature.

• 자원ㆍ환경경제연구
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• 제16권3호
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• pp.643-651
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• 2007

The Environmental Kuznets Curve Hypothesis postulates an inverted-U shaped relationship between GDP per capita and various pollutants. Pollutants emission increases up to a certain level as income goes up; after that, it decreases. This paper investigates the relationship between industry pollutants taking industrial sulfur dioxide omission as example, and economic growth by using province-panel data set from 1989 to 2004 in 28 provinces of P. R. China. The result shows that the EKC hypothesis may be supported in the case of industrial sulfur dioxide, and the GDP per capital of turning point is about RMB 13,548 (at 1978 price). Except Shanghai, all the provinces GDP per capital in this study are less than RMB 13,548, indicating the amount of industrial sulfur dioxide emission will be increasing in the near future. To realize sustainable development and pollutants abatement, the central and local government should adopt an integrated strategy to protect environment.

• 한국자동차공학회논문집
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• 제13권2호
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• pp.10-15
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• 2005

This study was initiated to evaluate the cooling performance of CAC (charged air cooler) and radiator in the engine room of a mini bus. So we had firstly to predict the mass flow rate coming from radiator grille and front bum per opening using computational fluid dynamics (CFD) simulation based on 3D configuration. And simulations were carried out for different cooling module layout and bum per opening hole size on sam e vehicle operating condition. Simulation results show that CAC cooling performance at reverse protecting plate-applying model was much efficient than that of the bum per opening hole size-increasing model in IMTD point of view. Part of the CFD simulation results was com pared to with experimental data. It was confirm ed that the CFD approach using STAR-CD based on pursuing no-com promise solution could provide design engineers with useful design information in the early design stage of vehicle development.

• Journal of Plant Biology
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• 제1권2호
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• pp.1-4
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• 1958

1. A vernalized Korean rye was exposed to Co60 in dose of 150r (dose rate was 7r per minute) and pollen mother cells were examined for cytological study. 2. According to the observation, it is quite clear that scraping of chromosomes soon after irradiation and surface stickiness at the period of 6 hours after irradiation were followed by structural changes at the period of 12 hours after irradiation.

• 산업공학
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• 제5권1호
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• pp.47-60
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• 1992

Korean government plans to expand R & D expenditures to 39.8 billion dollars (5 percent of GNP) and to secure 150,000 R & D manpower (30 per 10,000 population) until 2001. This paper deals with industrial research and development manpower and is to forecast the demand of science and technology manpower to keep pace with the economic development goals which includes advancement of science and technology. This is composed of two parts. The first part is the review of the basic concepts of this research while the second one projects and overall future demand of science and technology manpower.

• 설비공학논문집
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• 제7권2호
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• pp.225-233
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• 1995

Experiments were performed to investigate the heat transfer characteristics of nonazeotropic mixture R-22+R-114 in a heat pump system. The ranges of parameter, such as heat flux, mass flow rate, and quality were $8,141{\sim}32,564W/m^2$, 24~58kg/h, and 0~1, respectively. The overall compositions of the mixtures were 50 and 100 per-cent of R-22 by weight for R-22+R-114 mixture. The results indicated that there were distinct different heat transfer phenomena between the pure substance and the mixture. In case of pure refrigerant the heat transfer rates for cooling were strongly dependent upon quality of the refrigerant. Overall evaporating heat transfer coefficients for the mixture were somewhat lower than pure R-22 values in the forced convective boiling region. For a given flow rate, the heat transfer coefficient at the circumferential tube wall(top, side, and bottom of the test tube) for R-22/R-114(50/50wt%)mixture, however, was higher than for pure R-22 at side and bottom of the tube. Furthermore, a prediction for the evaporating heat transfer coefficient of the mixtures was developed based on the method of Yoshida et.al.'s. The resulting correlation yielded a good agreement with the data for the refrigerant mixtures.

• 대한의생명과학회지
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• 제26권1호
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• pp.8-13
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• 2020

Cervical cancer is the fourth most common cancer in women, with approximately 528,000 new cases and 266,000 women dying of it per year in the world. MicroRNAs have recently been in the spotlight as potential biomarkers that regulate gene expression and are involved in tumorigenesis. In the present study, we evaluated miR-1260b as a potential biomarker for screening of cervical cancer by quantitative reverse transcription PCR. We profiled the TCGA data of miR-1260b in 307 cervical cancer tissues. Then, miR-1260b expression levels in 10 cervical cancer tissues and 10 noncancerous tissues were investigated in a pilot study. miR-1260b was found to be significantly up-regulated in cervical cancer FFPE tissues as compared to those in cervical normal FFPE tissues (P = 0.006). The mean expression level of miR-1260b in late-stage (IIB-IVB) was higher than in those with early-stage (IA-IIA). Furthermore, high miR-1260b was found to be associated with high hTERT and Ki-67 mRNA expression, which are representative of tumor prognosis. The results of the pilot study suggest that miR-1260b may be used as a novel biomarker for improving the diagnosis of cervical cancer.

• Toxicological Research
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• 제12권2호
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• pp.309-318
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• 1996

This study was conducted to investigate the subacute intravenous toxicity of rHu-EPO in Sprague-Dawley rats. rHu-EPO was daily administered to male and female rats for 30 days with different dose levels(100, 500, 2,500 unit/ kg). After the administration period of 30 days, 5 males and 5females rats per each dose group were assigned for recovery period of additional 30 days. There were no clinical signs compared with control group but slight decrease in spontaneous motor activities and locomotions were observed at high dose groups of males and females. In males, feed consumption was reduced at 500 unit/kg and body weight gain was retarded. In the administration sites of tail, focal congestion was observed in a few animals treated with rHu-EPO. No deaths were occurred during the course of study. In hematological examination. a significant increase of hemoglobin and hematocrit was observed in the males and females rats receiving high dose of rHu-EPO. rHu-EPO administration for 30 days showed a marked decrease in glucose concentration. At the highest dose groups, there was a significant incerase in the weights of spleens in both sexes. but this was considered to be related to its pharmacological activity. These results indicate that rHu-EPO does not induce any significant toxic effect on Sprague-Dawley rats for 30 days.

• 한국산학기술학회논문지
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• 제15권12호
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• pp.7239-7247
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• 2014

본 연구는 저빈도 반복경두개자기자극(rTMS)이 만성 뇌졸중 환자의 인지기능에 미치는 영향을 알아보기 위해 실시하였다. MMSE-K와 한국어판 BCRS-K를 통해서 선별된 만성 뇌졸중 환자 30명을 대상으로 3개의 군으로 무작위로 나누었다. 실험군 I(n=10)은 소리만 동일시간 적용하게 하였고, 실험군 II(n=10)은 손상 측에 1 Hz rTMS를, 실험군 III(n=10)은 손상반대측에 1 Hz rTMS를 적용하여 주 5회, 1일 20분, 2주간 중재하였다. 인지기능의 변화를 알아보기 위해서 중재 전, 1주 후, 2주 후, 3개월 후 시점에서 CERAD-K 점수를 측정하였다. 연구 결과 즉각 기억단어는 실험군 I에 비교하여 실험군 II와 실험군 III에서 2주 후와 3개월 후에 통계학적으로 유의한 차이를 보였고(p<.05), 재인 기억단어에서는 실험군 III에서 2주 후와 3개월 후에 통계학적으로 유의한 차이가 나타났다(p<.05). 지연 기억단어는 실험군 I에 비해 실험군 III에서 3개월 후에 통계학적으로 유의한 차이를 보였다(p<.05). 따라서 본 연구결과를 통해서 뇌졸중 환자에서 저빈도 rTMS의 적용이 인지재활에 긍정적인 영향을 줄 수 있을 것으로 생각된다.

• 한국토양비료학회지
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• 제25권1호
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• pp.77-88
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• 1992

항생제 내성 변이균주 JB7 $nal^rspe^r$와 CB756 $str^rrif^r$을 이용하여 살균하지 않은 밭토양에서 접종방법이 근류균의 증식과 근류형성 및 질소고정에 미치는 영향을 조사하였다. JB7 $nal^rspe^r$균주(菌株)를 종자당 $10^2$에서 $10^8$세포수준으로 접종(接種)했을때 접종농도(接種濃度)의 증가와 함께 근류형성(根瘤形成)이 증가하였다. 접종방법별(接種方法別)로는 YMB배양 액체접종(液體接種)이 Peat slurry나 Peat입자(粒子) 접종(接種)보다 더 많은 근류(根瘤)를 형성(形成)했고, Peat slurry와 입자(粒子) 접종간(接種間)에는 차이가 없었다. 토양(土壤) g당 $10^3$ 세포(細胞)의 근류균(根瘤菌)을 함유(含有)하는 토양(土壤)에 JB7 $nal^rspe^r$와 CB756 $str^rrif^r$을 혼합(混合)하여 접종(接種)했을때 모든 근류(根瘤)가 접종균(接種菌)에 의하여 형성되었으며, JB7 $nal^rspe^r$균주(菌株)에 의한 근류점유율이 월등히 높았다. 품종간에 근류점유율의 차이는 없었다. 접종균류(接種菌株)는 근권에서 점진적으로 증식되었으며, JB7 $nal^rspe^r$가 더 큰 폭으로 증가되었다. 땅콩의 수량은 무접종구보다 접종구가 높았으나 질소처리구(窒素處理區)와 접종구간에는 차이가 없었다.