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측방유동 저감을 위한 Pile Slab의 적용성에 관한 연구
장정욱,박춘식,장일석 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
This study analyzed the reductive effect of lateral flow by the section and height of reinforcement of Pile Slab. The conclusions of the study are as follows. (1) The lateral flow of abutment increased linearly as the reinforcement section decreased. (2) The lateral flow of abutment showed the minimum value when the reinforcement height was 0.5h~0.6h. (3) The reinforcement section was found to have a close relationship with the reinforcement height. We conclude that more economical reinforcement methods would require consideration of this relationship between the two variables.
장정욱,박춘식,장일석 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
This study investigated the settlement of soft ground caused by fill-loading. The S.C.P replacement ratio(a_(s)), range(S_(0)/B), and depth(h_(0)/H) were taken as variables. The conclusions are presented in the following. (1) As a_(s), S_(0)/B, and h_(0)/H increases, the maximum settlement decreases. However, the maximum settlement is less in S_(0)/B than in as, and h_(0)/H. (2) Changes in the maximum settlement are relatively great in the range of h_(0)/H = 0.2~0.6, but small in the case of h_(0)/H>0.6. (3) The reducing rate becomes different when a_(s) = 30%, and S_(0)/B = 0.6. (4) When a_(s) = 10%, the maximum settlement due to the increase in replacement depth reduces little relatively to other replacement ratios.
A Case of Cardiac Dysfunction Associated with Monoclonal Gammopathy of Undetermined Significance
장석태,손일석,조진만,김종진,임성직,진은선 대한의학회 2009 Journal of Korean medical science Vol.24 No.2
The monoclonal gammopathies (MG) are monoclonal neoplasms related to each other by virtue of their development from common progenitors in the B lymphocyte lineage. Cardiac dysfunction in patients with MG is not well established. We experienced a case of cardiac dysfunction associated with MG identified by echocardiography and biopsy. Fifty nine year-old man was admitted because of dyspnea for several months. Echocardiography revealed diastolic dysfunction showing restrictive physiology with elevated left ventricular filling pressure. Bone marrow (BM) studies and immunoelectrophoresis were compatible with monoclonal gammopathy of undetermined significance. Endomyocardial, BM, and enteral biopsies for ruling out for amyloidosis (Congo-red stain) were negative. This is the case of non-amyloidotic light chain deposition cardiomyopathy.
박춘식,장정욱,장일석 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
This study suggests the most reasonable analytical and reinforcement methods for possible collapse of underground caused by levee construction on the soft ground. We inspected stability of levee in the field where heaving caused by sliding had occurred. We applied three reinforcement methods: Surcharge method, Sand Compaction Pile method, and Deep mixing method, all of which met the allowable safe factor. However, Surcharge method requires great amount of costs for land compensation and Sand Compaction Pile method had disadvantages of higher construction cost and instability of levee caused by vibration. Therefore, Deep mixing method is considered the most proper method.
박춘식,장정욱,장일석 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
This study examined soil parameters, existence of ground water, and the safety factors of slope according to the ground water level. The following are the conclusions of the study. (1) The safety factor became less as the ground water level decreased. (2) The greater the cohesion became, the less the safety factors according to the ground water level did. (3) In the case with ground water, greater cohesion had less effect on the safety factor. However, in the case without ground water, changes in cohesion had considerable effects on the safety factor. (4) While the safety factor increased associated with increase in the angle of shear resistance as the ground water level, the safety factor according to cohesion was almost constant.