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십이지장게실(十二指腸憩室)에 대한 임상적(臨床的) 관찰
최동호,한영희,안승운,김창국,이주태,백병룡 대한소화기학회 1977 대한소화기학회지 Vol.9 No.1
33 cases of duadenal diverticula were visualized on 194b upper gastrointestinal series in our clinic during recent 3 years (l.7%). Sex distribution was 54.5% in male and 45.5% in female, and the highest incidence in age-distribution was found in 5th and 6th decade of life (72.7%). More than four-fifths were located in the second portion of the duodenum: 10.8% were in the third portion. 8.1% were in the first portion. 97% were medial and 3% were lateral. Solitary diverticulum was found in 87.9%, and 12.1% were multiple. The size of diverticulum was various ranging from 5mm to 50mm in longitudinal diameter, except only one giant diverticulurn of 78mm. Epigastric discomfortness, upper abdominal vague pain, indigestion, anorexia, nausea, vomiting and acid belching were found in most of the cases of duodenal diverticulum, and relieved by bland diet, antiacid and anti cholinergic drugs.
Nonlinear Static Analysis of Continuous Multi-span Suspension Bridges
최동호,권순길,유훈 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
This paper performs the static analysis of multi-span suspension bridges using the deflection theory. Applying the deflection theory conventionally used in three-span suspension bridges to multi-span suspension bridges, the horizontal forces of the main cables due to live loads are obtained by converting the suspension system to the equivalent beam system and using the compatibility equation of cables for four spans. Iterative computations are used due to nonlinearity of the differential equations. The results, such as deflections and moments of girders and horizontal forces of the main cable, are compared with the finite element analysis for verification. The resultant values from two methods are almost the same. Finally, using the linearized deflection theory, parametric studies are performed by influence line analyses for parameters such as the side-to-center span ratio, the tower stiffness ratio and the sag to span ratio. From the parametric studies, alternatives to reduce displacements of girders in the center span and girder moments of all spans are investigated.
Tension Force Estimation of Extradosed Bridge Cables Oscillating Nonlinearly under Gravity Effects
최동호,박완순 한국강구조학회 2011 International Journal of Steel Structures Vol.11 No.3
Extradosed bridges have loose and sagged cables that are different from those used in cable-stayed bridges. The total tension force of an extradosed bridge cable estimated using the existing formulas is not accurate. Although the existing formulas are widely used in the field, they do not consider the exact deflection curve, features of nonlinear oscillation, and stretching force due to self-weight. In this study, a new method was developed to calculate the total tension force of the cable. In the new method, the total tension force of the cable includes the applied axial load and the stretching force due to self-weight. For the exact estimation of the applied axial load to the cable, the vibration of the cable was treated as a conservative nonlinear oscillation system, and a new formula was derived using the perturbation technique. The new formula was used to clearly explain the hardening effect due to the initial amplitude of the initial excitation, the presence of imaginary number of frequencies, the correlation with the stretching force due to self-weight, and the softening effect of the slenderness ratio on nonlinear natural frequency. For calculating the stretching force due to self-weight, the stretching of the cable for the static deformation was considered. A field test showed that it is necessary to add the stretching force due to self-weight to the estimated axial load for extradosed bridge cables and that the new method can be used to calculate the total tension force of loose and sagged cables.