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정원국,이범석,김영훈,김수경,최유남 대한재활의학회 2005 Annals of Rehabilitation Medicine Vol.29 No.4
Objective: The purpose of this follow-up study was to evaluate the status of standing and gait for the paraplegics at their home after discharge. Method: A medical doctor interviewed 93 paraplegics by spinal cord injury, who visited the outpatient clinic of the National Rehabilitation Hospital, or who were admitted for the follow up urologic evaluation. Results: Out of 93 paraplegics, 90 patients had done a standing exercise in hospitals, but 42 patients continued a standing exercise after discharge. Seventy-nine patients had done a gait exercise in hospitals, but only 24 patients continued a gait exercise after discharge. Seventy-five patients were prescribed KAFO (Knee-Ankle-Foot orthosis), but only 11 patients used the KAFO continuously after discharge. The reasons to stop using KAFO were loss of motivation, lack of time, no helper, difficulties with wearing orthoses, and etc. The continuous using rates of other standing or exercise equipments were higher than that of KAFO. Conclusion: Many paraplegics had done gait training and had been prescribed KAFO in hospitals. But only 14.7% of them had used KAFO for any purpose after discharge. We believe that more careful consideration and explanation are needed to each patient. We think that standing or exercise equipments are good alternatives.
Luminescence Characteristics of InGaAs/GaAs Quantum Dots Emitting Near 1.5 µm
정원국,S. H. Pyun 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.2
Long-wavelength emission near 1.5 µm at room temperature has been achieved from In-GaAs/GaAs quantum dots (QDs) and the luminescence characteristics of the QDs have been analyzed. The PL peaks originating from excited states up to the 4th excited state are always seen under PL excitation powers that vary by a factor of 100. The intensities of all these quantized energy state peaks increase continuously with increasing PL excitation power. To the contrary, the PL peak energies do not change much while the peak intensity changes by more than tenfold. All these characteristics are shown to be caused by the carrier distribution among the quantized energy states far from quasi-equilibrium in the conduction and the valence bands. This non-equilibrium carrier population is explained to be due to the difficulty in carrier transfer among QDs while the number of carriers in the QDs is not uniform due to the spatially non-uniform QD density and non-uniform PL excitation power density.
뇌졸중및기타뇌손상장애인의자동차운전을위한인지-지각능력평가도구(CPAD)와MVPT, MMSE의상관관계
정원국 대한뇌졸중학회 2004 Journal of stroke Vol.6 No.1
Department of Rehabilitation Medicine, National Rehabilitation HospitalDepartment of Biomedical Engineering, Hanyang University*Background: The purpose of this study was to find out whether Cognitive-Perceptual Assessment for Driving(CPAD) can evaluate cognition and perception of brain injured patients for driving. Methods: Twenty-eight braindamaged subjects were evaluated with Motor Free Visual Perception Test(MVPT), Mini-Mental StatusExamination(MMSE). They have had driver’s licence and driving experience. Subjects also were evaluated withCognitive-Perceptual Assessment for Driving(CPAD). CPAD consists of 11 measurement variables of 8 tasks. Weanalyzed the correlation between CPAD and MVPT, MMSE. Results: 1) CPAD total score was well correlatedwith MVPT score, MMSE score(p〈0.05). 2) 8 standardized values of CPAD were correlated with MVPT score. 3)5 standardized values of CPAD were correlated with MMSE score. Conclusions: CPAD can be used as evaluationtool of cognition and perception for brain injured patients who want to drive.대한뇌졸중학회지제6권제1호2004년5월