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김용인,류지호,민문기,박맹렬,박순창,염석란,한상균,박성욱,이성화 대한응급의학회 2018 Clinical and Experimental Emergency Medicine Vol.5 No.2
Objective To assess whether ultrasonographic examination compared to chest radiography (CXR) is effective for evaluating complications after central venous catheterization. Methods We performed a prospective observational study. Immediately after central venous catheter insertion, we asked the radiologic department to perform a portable CXR scan. A junior and senior medical resident each performed ultrasonographic evaluation of the position of the catheter tip and complications such as pneumothorax and pleural effusion (hemothorax). We estimated the time required for ultrasound (US) and CXR. Results Compared to CXR, US could equivalently identify the catheter tip in the internal jugular or subclavian veins (P=1.000). Compared with CXR, US examinations conducted by junior residents could equivalently evaluate pneumothorax (P=1.000), while US examinations conducted by senior residents could also equivalently evaluate pneumothorax (P=0.557) and pleural effusion (P=0.337). The required time for US was shorter than that for CXR (P<0.001). Conclusion Compared to CXR, US could equivalently and more quickly identify complications such as pneumothorax or pleural effusion.
EXISTENCE OF PERIODIC SOLUTIONS FOR PLANAR HAMILTONIAN SYSTEMS AT RESONANCE
김용인 대한수학회 2011 대한수학회지 Vol.48 No.6
The existence of periodic solutions for the planar Hamilton-ian systems with positively homogeneous Hamiltonian is discussed. The asymptotic expansion of the Poincare map is calculated up to higher or-der and some sufficient conditions for the existence of periodic solutions are given in the case when the first order term of the Poincare map is identically zero.
EXISTENCE OF PERIODIC SOLUTIONS FOR A GENERAL CLASS OF p-LAPLACIAN EQUATIONS
김용인 한국수학교육학회 2011 純粹 및 應用數學 Vol.18 No.1
The existence of T-periodic solutions for a general class of p-Laplacian equations is investigated. By using coincidence degree theory, some existence and uniqueness results, which generalize some earlier works on this topic, are presented.
ESTIMATION OF DIFFERENCE FROM HÄOLDER'S INEQUALITY
김용인 한국수학교육학회 2010 純粹 및 應用數學 Vol.17 No.2
We give an upper bound for the estimation of the di®erence between both sides of the well-known HÄolder's inequality. Moreover, an upper bound for the estimation of the difference of the integral form of HÄolder's inequality is also obtained. The results of this paper are natural generalizations and re¯nements of those of [2-4].
SUFFICIENT CONDITIONS FOR THE INTERSECTION PROPERTY IN GENERALIZED LI¶ENARD SYSTEMS
김용인 한국수학교육학회 2011 純粹 및 應用數學 Vol.18 No.3
Some new results on the intersection property of all nonzero solutions of a class of planar systems of Li¶enard type with vertical isoclines are obtained. The results of this paper generalize some previous results on this ¯eld.