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유기원,박태준,김정,장병찬,양수빈,손종태 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1
Low-cobalt Li[Ni0.6Co0.1Mn0.3]O2 cathode materials were synthesized by using a hydroxide coprecipitationmethod. Because we wanted to optimize the synthesis conditions, we studied theeffects of different lithium contents and calcination temperature on the structural and the electrochemicalproperties of this unfamiliar cathode material. All as-prepared materials were indexedin the R-3m space group, and all samples showed different structural and electrochemical propertiesfor different synthesis conditions. In particular, in the case of NCM-4 (lithium content: 1.09,calcination temperature: 850 C), the sample showed excellent electrochemical properties with a reversiblespecific capacity of 175.00 mAhg−1 [cut-off voltage: 3.0 4.3 V, 0.1 C (current density: 17mAhg−1)] and a good capacity retention of 91.7% after 50 charge/discharge cycles [cut-off voltage:3.0 4.3 V, 1 C (current density: 170 mAhg−1)].
유기원,강용구,이한용,고해석,최진화 대한척추외과학회 1996 대한척추외과학회지 Vol.3 No.2
To evaluate the clinical characteristics and treatment of lumbar disc herniations over the age of 60 years old, we reviewed 13 patients. The mean age was 63.8 years old. We excluded the patients with degenerative spinal deformities or spinal stenosis. The mean duration of symptoms was 6.8 months. Sciatica was the predominant symptom and was present in all patients. Positive nerve root tension sign was seen in 85% of the patients. Motor weakness and sensory deficits were found in more than half of the patients. The lumbar disc herniations in elderly patients showed typical clinical symptoms of disc herniation with short duration of severe back pain and sciatica rather than those of spinal stenosis or other degenerative spinal diseases. The one third of the patients showed multi-segment involvement in preoperative CT and MRI. In the type of disc herniation, the destruction of posterior annulus fibrosus (extruded or sequestrated) was predominant. All of the patients was treated with partial hemilaminectomy and disc excision without further lateral or foraminal decompression for the all involoved segments. Mean follow-up was 28 months. About seventy percent of the patients had excellent or good final results. The surgery for the lumbar disc herniation in elderly patients will yield satisfctory results if a proper investigation and correct diagnosis are obtained.