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Propylene 산화반응에서 촉매내 전달 현상의 영향
김상환,이인철,박형상 한국화학공학회 1988 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.26 No.5
Propylene 부분 산화용 tin-antimony oxide계 공업용 촉매에서 촉매내 물질전달 현상이 반응에 미치는 영향을 다공성 매질내의 물질전달에 관한 Dusty-Gas model과 Feng-Stewart model을 이용하여 검토하였다. 본 촉매반응의 경우 촉매내에 multiple solution은 생기지 않았으며, 촉매 내부 전달 현상에 의하여 propylene의 acrolein으로의 선택성은 감소하였다. 위 두 model이 서로 다른 basis를 갖고 있는데 반하여, 기공 크기가 uniform하고 촉매내에서 viscous flow가 없는 경우에는 같은 결과를 보여줌을 알 수 있다. The influence of internal diffusion on the partial oxidation of propylene on the tin-antimony oxide based catalyst has been studied. For this study, two flux relations in the porous medium (Dusty-Gas model and FengStewart model) have been adopted. In this catalytic reaction system, multiple solution problem has not happened and the internal diffusion decreases the selectivity of propylene to acrolein. The two models differ conceptually, but it has been known that they give the same result for the catalytic reaction system of uniform pore size and no net viscous flow.
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김상환,장경준,김학문,고동필 한국지반공학회 2009 한국지반공학회논문집 Vol.25 No.1
This paper presents a new approach of risk evaluation method for the reinforced slopes. In order to perform this study, the existing stability and risk evaluation methods are reviewed and analysed in terms of rainfall, ground condition, and drain conditions. According to the characteristic of the reinforced slopes improved by internal and external reinforcement, the nineteen influence factors are determined in order to develop new risk analysis model based on ‘Interaction matrix’ approach suggested by Hudson (1991). Using new approach of slope risk analysis model, the weighting values for interaction factors are analysed and determined. Based on new slope risk evaluation approach, the slope risk index, namely SRI (Slope Risk Index) is developed in this study to apply the evaluation of the reinforced slopes. In order to verify the SRI, a total of 15 cases are studied and analysed. The analysed results are compared and evaluated. According to the results, it is deduced that new slope risk evaluation method (SRI approach) is very useful and practically a reliable method to evaluate the existing slopes.
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저토피 구간의 신개념 고성능 터널지보시스템에 대한 연구
김상환,서동현,윤승기 한국지반공학회 2009 한국지반공학회논문집 Vol.25 No.7
This paper presents a new high-performance supporting system of the shallow tunnel. In order to perform this research the mechanism of new supporting system is suggested and compared with the conventional existing supporting system. It is found that the new supporting system as pre-support system has several advantages such as improvement of ground before tunnel excavation and increment of capacity of the tunnel support. The construction procedures of this supporting system are also reviewed. In addition, the numerical simulation is carried out to evaluate the new supporting system. It is found that the new high-performance supporting system is very applicable in shallow depth tunnel such as portal area, tunnel in soil and weak zone, and so on.
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김상환,김태균,최제인,임기운 한국지반공학회 2010 한국지반공학회논문집 Vol.26 No.9
This paper presents the injection efficiency of 2.0 shot system which was verified by strength and injection time. In order to perform this study, laboratory model tests and field tests are carried out. The laboratory model tests consist of the test of injection time for verifying the injection ratio, and the tests of homo-gel and sand-gel strengths for estimating the characteristic of strength. It is found that the injection ratio of 1:2 shows the best seepage into the ground. The results of the strengths are also larger than other injection ratio. The large strength will also be expressed by field tests at construction site.
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김상환,정용수,고동필,강소라 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.7
In this paper, the behaviour of shell foundation was studied. In the theoretical program, the general shallow foundation theories and failure mechanism developed by Terzaghi, Mayerhof and others were reviewed and compared. In the numerical study, the 2 and 3 dimensional FEM simulations were carried out using an uncoupled-analysis approach. The results obtained from the model test show that the bearing capacity of shell foundation was about 25% to 30% larger than that of general foundation. Due to the cases of shell angle, the maximum bearing capacity of shell foundation shows when the shell angle of foundation was 60°. In addition, even if the shell foundation has various advantages compared with the general foundations as described above, the practical verifications in full scale size will be necessary to use in the field and will be helpful in the technical development of other special foundations.
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