http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
UV 광산화 공정 및 광촉매 공정을 이용한 벤젠 및 톨루엔 가스의 처리
황철원,전보경,김찬훈,서정민,최금찬 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2
Volatile organic compounds (VOCs) are widely used in both industrial and domestic activities. This extensive use results in adverse effect in aquatic, soil and atmospheric environments. Conventional methods for treating VOCs from gas streams, such as absorption, adsorption, condensation and thermal /catalytic incineration all have their inherent limitations and none are definitely cost-effective to treat emissions from the small workplace such as architectural coating, printing, and dry cleaning. In this study, photooxidation-photocatalytic oxidation process was applied in the decomposition of VOCs and benzene and toluene, typical VOCs in industrial area, which were adapted as experimental gases. In photooxidation process, the decomposition efficiency of benzene and toluene was evaluated by varying different conditions, such as UV output, flowrate and background gas. The results showed that the decomposition efficiency of benzene and toluene increased considerably with increasing UV output and retention time. In case of background gas, the decomposition efficiency in standard air was higher than that in nitrogen. In photooxidation-photocatalytic oxidation process, the decomposition efficiency was higher than that in photooxidation process and the concentration of ozone generated from photooxidation reactor was drastically decreased after photocatalytic oxidation process. From this study, the results indicate that photooxidation-photocatalytic oxidation process is ideal for treatment of benzene and toluene from the small workplace. But further process optimization must be achieved to apply this process in workplace.
Recombinant canstatin inhibits angiopoietin‐1‐induced angiogenesis and lymphangiogenesis
Hwang‐,Bo, Jeon,Yoo, Ki Hyun,Park, Jong‐,Hwa,Jeong, Han‐,Sin,Chung, In Sik Wiley Subscription Services, Inc., A Wiley Company 2012 International journal of cancer: Journal internati Vol.131 No.2
<P><B>Abstract</B></P><P>We describe the effect of recombinant canstatin, the NC1 domain of the α2 chain of Type IV collagen, on suppression of angiogenesis and lymphangiogenesis both <I>in vitro</I> and <I>in vivo</I>. Recombinant canstatin produced from stably transformed <I>Drosophila</I> S2 cells reduced the expression of angiopoietin‐1 in hypoxia mimetic agent, CoCl<SUB>2</SUB>‐treated CT‐26 cells. Recombinant canstatin inhibited proliferation, tube formation and migration of human angiopoietin‐1 (rhAngpt‐1)‐treated human umbilical vein endothelial cells (HUVEC) and lymphatic endothelial cells (LEC). Recombinant canstatin suppressed the expression of Tie‐2 and vascular endothelial growth factor‐3 (VEGFR‐3) transcripts in rhAngpt‐1‐treated HUVEC and LEC, respectively. The inhibitory effect of recombinant canstatin on tumor growth was also investigated using a heterotopic CT‐26 colon carcinoma animal (BALB/c mice) model. Recombinant canstatin reduced the final volume and weight of tumors, and blood and lymphatic vessel densities of tumors, which were evaluated by CD‐31 and LYVE‐1 immunostaining. Immunohistochemical analysis showed that recombinant canstatin dramatically reduced the expression of angiopoietin‐1 in CT‐26 colon carcinoma‐induced tumor, but not the expression of VEGF‐C. Tie‐2 and VEGFR‐3 expressions were also reduced in recombinant canstatin‐treated tumors. These results indicate that recombinant canstatin has anti‐tumoral activities against CT‐26 colon carcinoma cells. Recombinant canstatin reduces the expression of angiopoietin‐1 in hypoxia‐induced CT‐26 cells and inhibits the angiogenic and lymphangiogenic signaling induced by angiopoietin‐1. Recombinant canstatin probably inhibits angiogenesis and lymphangiogenesis <I>via</I> suppression of the integrin‐dependent FAK signaling induced by angiopoietin‐1/Tie‐2 and/or VEGFR‐3.</P>
영어 쓰기능력 함양을 위한 교수-학습 방법 제안 : 자기주도적 학습활동을 통하여
황보근,전병락 대구대학교 인문과학 예술문화연구소 2003 人文科學硏究 Vol.25 No.-
The ultimate object in English education is to cultivate the communicative competence. Spoken English has been put great emphasis on, while the writing skill of English has been mostly neglected. The purpose of this study is to help middle students develop and improve their English writing skill through self-directed learning activities by students themselves, presenting them various effective teaching and learning techniques. The analytical results of the hypotheses indicated the following conclusions: First, in improving writing skill in English, continuous writing activities by the self-directed learning method are more effective than the traditional one. Second, the experimental method has a positive transitional effect on improvement of the students' general English proficiency because it has beneficial effects upon other skills as well. Lastly, the continuous writing activities by the self-directed learning method made affirmative changes in the students' attitude towards and increased their interest in English more than by the traditional method.
황성욱,전보경,김찬훈,서정민,최금찬 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.1
It is important to know the impacts of acid rain because of soil acidification, reduced biological productivity. Many researchers were interested in regional acid problems, and former research were focued in short-term trends of acid rain. It is not easy to evaluate acid rain problems because of many parameters relating to meteorological factors, which are wind, temperature, humidity and other factors. Rainfall sampling for this study was done from September 1933 to December 2000 in Dong-A University, Busan. All Samples were collected in separately to early fraction and succeeding fraction. Also, the samples were measured for pH, and EC, cations and anions were analysed by ion Chromatography.
Hwang, Hye Jeon,Kim, Kyoung Won,Jeong, Woo Kyoung,Song, Gi-Won,Ko, Gi-Young,Sung, Kyu Bo,Shin, Yong Moon,Kim, Pyo Nyun,Ha, Tae-Yong,Moon, Deok-Bog,Kim, Ki-Hun,Ahn, Chul-Soo,Hwang, Shin,Lee, Sung-Gyu Radiological Society of North America 2009 Radiology Vol.253 No.2
<P>PURPOSE: To establish optimal Doppler ultrasonographic (US) venous pulsatility index and computed tomographic (CT) criteria for right hepatic vein (RHV) stenosis after living donor liver transplantation (LDLT) and to compare accuracies of these methods by using receiver operating characteristic (ROC) analysis. MATERIALS AND METHODS: This retrospective study was approved by an institutional review board; informed consent was waived. Eighty patients (48 men, 32 women; mean age, 51.5 years +/- 9.2 [standard deviation]) underwent Doppler US and CT within 8 days of hepatic venography following right lobe LDLT between October 2006 and September 2008. At venography, RHVs were classified into a stenosis or nonstenosis group. At Doppler US, venous pulsatility index was defined as the difference between maximum and minimum frequency shifts divided by maximum frequency shift. At CT, diameters of anastomosis and RHV were measured; percentage of stenosis was calculated. Mean Doppler US and CT parameters in the two groups were compared; ROC analysis was performed. RESULTS: There were 30 stenotic and 50 nonstenotic RHVs. Mean venous pulsatility index and mean anastomosis diameter were significantly lower and mean percentage of stenosis was significantly higher in the stenosis than the nonstenosis group (P < .001 each). Optimal cutoffs for venous pulsatility index, anastomosis diameter, and percentage of stenosis were 0.16, 3.7 mm, and 47%, respectively. Sensitivity and specificity were 86.7% and 68.0% for venous pulsatility index, 96.7% and 88.0% for anastomosis diameter, and 96.7% and 86.0% for percentage of stenosis, respectively. At ROC analysis, anastomosis diameter (P = .002) and percentage of stenosis (P = .003) were significantly more accurate than venous pulsatility index. CONCLUSION: CT is more accurate than Doppler US for RHV stenosis after LDLT, with venous pulsatility index as the sole sonographic criterion. Patients suspected of having RHV stenosis at Doppler US may benefit from CT to reduce unnecessary venography.</P>