http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
일본의 철도부문 기후변화대응 분석을 통한 국내 적용가능한 철도정책 방향 제시
고재균(Ko Jae-Kyun),김진용(Kim Jin-Yong),강승우(Kang Seung-Woo),김용기(Kim Yong-Ki) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
As environmental problems in transport sector, the global warming issue and the air pollution problem become aggravated and the effort for the achievement of an environmental friendly society becomes the prior problem. IPCC reported that 17% of the global GHGs emission is from transport sector. Road transport sector contributes to 70% of transport sector's GHGs emission. Nowadays, climate change is a global issue and railway transport is marked as an environmental friendly transport mode. For decreasing the GHGs emission of road transport sector which occupies almost of transport sector's GHGs emission, railway transport is emphasized as a environmental friendly alternative transport. In this paper, for the promotion of railway transport's role about climate change, I indicated the direction of South Korea's railway transport policy by analyzing Japanese modal shifts and railway transport's climate change policy.
Colning of Guamerin , a New Elastase Inhibitor
강계원,고재균 한국유전학회 1995 Genes & Genomics Vol.17 No.4
A new human leukocyte elastase inhibitor called the guamerin was isolated and purified from Korean native leech, Hirudo nipponia in our laboratory. For cloning of guamerin, total RNA and mRNA were isolated from leech body. And then first-strand cDNA, we designed two degenerate primers that were made from N-terminal and C-terminal amino acid sequences of guamerin. We isolated PCR product of 170bp size and cloned 170bp PCR product into SmaI site of pUC19. And then the sequence of the insert was determined by dideoxy method with universal primer and reverse primer. The sequences of PCR products were completely determined and product showed the structural gene of guamerin. Guamerin fusion protein expression and cDNA library construction are carried out.
생물개스 발생시스템을 위한 지하매설콘크리트 다이제스터의 열전달에 관한 연구
김윤기,고재균 한국농공학회 1980 한국농공학회논문집 Vol.22 No.1
The research work is concerned with the analytical and experimental studies on the heat transfer phenomenon around the underground concrete digester used for biogas production Systems. A mathematical and computational method was developed to estimate heat losses from underground cylindrical concrete digester used for biogas production systems. To test its feasibility and to evaluate thermal parameters of materials related, the method was applied to six physical model digesters. The cylindrical concrete digester was taken as a physical model, to which the model,atical model of heat balance can be applied. The mathematical model was transformed by means of finite element method and used to analyze temperature distribution with respect to several boundary conditions and design parameters. The design parameters of experimental digesters were selected as; three different sizes 40cm by 80cm, 80cm by 160cm and l00cm by 200cm in diameter and height; two different levels of insulation materials-plain concrete and vermiculite mixing in concrete; and two different types of installation-underground and half-exposed. In order to carry out a particular aim of this study, the liquid within the digester was substituted by water, and its temperature was controlled in five levels-35。 C, 30。 C, 25。 C, 20。C and 15。C; and the ambient air temperature and ground temperature were checked out of the system under natural winter climate conditions. The following results were drawn from the study. 1.The analytical method, by which the estimated values of temperature distribution around a cylindrical digester were obtained, was able to be generally accepted from the comparison of the estimated values with the measured. However, the difference between the estimated and measured temperature had a trend to be considerably increased when the ambient temperature was relatively low. This was mainly related variations of input parameters including the thermal conductivity of soil, applied to the numerical analysis. Consequently, the improvement of these input data for the simulated operation of the numerical analysis is expected as an approach to obtain better refined estimation. 2.The difference between estimated and measured heat losses was shown to have the similar trend to that of temperature distribution discussed above. 3.It was found that a map of isothermal lines drawn from the estimated temperature distribution was very useful for a general observation of the direction and rate of heat transfer within the boundary. From this analysis, it was interpreted that most of heat losses is passed through the triangular section bounded within 45 degrees toward the wall at the bottom edge of the digesten Therefore, any effective insulation should be considered within this region. 4.It was verified by experiment that heat loss per unit volume of liquid was reduced as the size of the digester became larger For instance, at the liquid temperature of 35˚ C, the heat loss per unit volume from the 0. 1m$^3$ digester was 1, 050 Kcal/hr m$^3$, while at for 1. 57m$^3$ digester was 150 Kcal/hr m$^3$. 5.In the light of insulation, the vermiculite concrete was consistently shown to be superior to the plain concrete. At the liquid temperature ranging from 15。 C to 350 C, the reduction of heat loss was ranged from 5% to 25% for the half-exposed digester, while from 10% to 28% for the fully underground digester. 6.In the comparison of heat loss between the half-exposed and underground digesters, the heat loss from the former was fr6m 1,6 to 2, 6 times as much as that from the latter. This leads to the evidence that the underground digester takes advantage of heat conservation during winter.