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폐 WC-Co계 초경합금에서 추출된 코발트 재생 원료를 이용한 LiCoO<sub>2</sub> 입자 합성 연구
양희승,피재환,김유진,Yang, Hee-Seung,Pee, Jae-Hwan,Kim, Yoo-Jin 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.3
[ $LiCoO_2$ ] a cathode material for lithium rechargeable batteries, was prepared using recycled $Co_3O_4$. First, the cobalt hydroxide powders were separated from waste WC-Co hard metal with acid-base chemical treatment, and then the impurities were eliminated by centrifuge method. Subsequently, $Co_3O_4$ powders were prepared by thermal treatment of resulting $Co(OH)_2$. By adding a certain amount of $Li_2CO_3$ and $LiOH{\cdot}H_2O$, the $LiCoO_2$ was obtained by sintering for 10 h in air at $800^{\circ}C$. The synthesized $LiCoO_2$ particles were characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) analysis.
양희승,이승화,강은경,박영옥 대한재활의학회 2005 Annals of Rehabilitation Medicine Vol.29 No.5
Krabbe's disease is a rare autosomal recessive disorder characterized by hemiplegia, paraplegia, ataxia, cortical blindness, and peripheral neuropathy. This disease is caused by deficiency of the lysosomal enzyme galactocerebroside β- galactosidase(GALC), resulting in demyelination of white matter of brain and peripheral nerve. We reported a 38-year- old female developed a slowly progressive weakness of lower extremities and gait disturbance since age of 10. Neurological examination revealed spastic weakness of both lower extremities, hyperactive deep tendon reflexes and in-trinsic muscle atrophy of both hands and feet. Electrophysiologic study showed uniform demyelinating sensorimotor peripheral neuropathy. T2-weighted brain MRI (magnetic resonance imaging) findings revealed symmetric high signal intensity along the bilateral corticospinal tract. The diagnosis of Krabbe's disease was confirmed by finding of markedly reduced GALC activity in leukocyte. We recommended to consider Krabbe's disease in the diagnosis of patients affecting both central and peripheral nervous system.
Surgical Treatments on Patients with Anterior Cervical Hyperostosis-Derived Dysphagia
양희승,Ah Rom Song,Eunjin Byun,Youngbae Kim,Kwan Ho Park,Kyung Lyul Kim 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.5
Anterior cervical hyperostosis may be a cause of dysphagia. For anterior cervical hyperostosis, medical or surgical treatments can be adhibited in view of the causative mechanisms and intensities of dysphagia. We report 3 cases of cervical hyperostosis-derived progressive dysphagia that underwent operation. Radiologic diagnosis and Video Fluoroscopic Swallowing Study were performed on the three patients for evaluation. One had history of recurrent aspiration pneumonia accompanied by weight loss, another complained of dysphagia only when swallowing pills, and the third experienced recurrence symptom with reossification. All patients reported gradual improvement of dysphagia immediately after their cervical osteophytes were resected through the anterior approach. In relation to postoperative improvement, however, they expressed different degrees of satisfaction according to severity of symptoms. Surgical treatment, performed for the anterior cervical hyperostosis-derived dysphagia, can immediately relieve symptoms of difficulty in swallowing. This might especially be considered as an appropriate treatment option for severe dysphagia.
Synthesis of LiCoO2 nano powders using recycled cobalt precursors from waste WC-Co hard metal
양희승,피재환,김형태,김유진 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.3
LiCoO2, a cathode material for lithium rechargeable batteries, was prepared using recycled Co3O4. First, cobalt powders were separated from waste WC-Co hard metal with an acid-base chemical treatment. Subsequently, Co3O4 powders were prepared by thermal treatment of the resulting Co(OH)2. By adding a predetermined amount of LiOH •H2O, LiCoO2 was obtained by sintering for 10 h in air at 800 οC. Nano-sized LiCoO2 was obtained by thermal treatment of the LiOH-coated Co3O4 particles at 500 οC for 3 h. LiOH was coated onto the Co3O4 particles by a sonochemical method. The synthesized micro- and nano-LiCoO2 particles using recycled Co precursors were characterized by X-ray diffraction (XRD) and a scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis.