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김희탁 ( Hee-tak Kim ) 한국공업화학회 2017 공업화학전망 Vol.20 No.3
본고에서는 바나듐 레독스 흐름전지의 핵심 부품인 멤브레인의 기술적 이슈와 개발동향에 대해 정리하였다. 현재 나피온계 멤브레인은 우수한 전기화학적 특성 및 우수한 기계적/화학적 내구성을 가져 상업적으로 적용되고 있으나, 높은 가격으로 인한 시스템 저가격화의 한계로 인해 저가 대체제의 개발 필요성이 증대되고 있다. 이에 따라, 두께저감을 통한 나피온 소재사용량 저감, 저가 탄화수소계 멤브레인의 내산화성 향상, 저가 다공성 멤브레인의 바나듐 크로스오버 억제의 방향으로 연구개발이 이루어지고 있다. 국내에서도 멤브레인 및 전지산업에서 축적된 기술들의 융합을 통한 경쟁력 있는 멤브레인의 개발이 필요한 시점이다.
대동작 기능분류 시스템 수준 I과 II 뇌성마비 환자에게 맞춤형 인솔 착용이 보행에 미치는 영향
김희탁(Kim, Hee-Tak),김성경(Kim, Sung-Gyung) 한국보건기초의학회 2021 한국보건기초의학회지 Vol.14 No.2
The purpose of this study was to determine the effect on the temporal-spatial parameters and timed up and go tests with or without customized insoles for spastic cerebral palsy with Gross Motor Function Classification System (GMFCS) leves (I and II). GAITRite system was measured to temporal-spatial gait pareameters and gait speed were measured with time up and go test (TUG). Participants were 19 subjects diagnosed cerebral palsy and the statistical method was paired t-test. The results showed a significant decrease in walking tests after wearing before wearing the insole, and significant changes velocity, TUG, step length, stride length, single support Rt, double support, stance Lt (p< 0.05), but step time, cycle time, single support Lt, stance Rt did no differ significantly (p> 0.05). As a result, if a significant change occurs in the walking speed, temporal-spatial parameters and the difficulty of walking due to various foot deformations, it has a positive effect on walking by wearing a patient-specific insole.
김희탁 ( Hee-tak Kim ) 한국공업화학회 2018 공업화학전망 Vol.21 No.6
본고에서는 차세대 리튬이차전지의 고용량 음극재료로 각광받는 리튬금속음극의 가역성 향상을 위한 보호막의 기술적 이슈와 개발동향에 대해 정리하였다. 리튬금속음극은 불균일한 리튬의 전착 및 용출, 전해액과의 반응으로 인해 표면 저항층 증가, 전해액 및 리튬고갈, 덴드라이트에 대한 단락 등의 문제가 발생한다. 리튬금속음극을 이용한 리튬금속전지의 성공적인 개발을 위해 전해액과의 반응을 차단하고 균일한 리튬 전착/용출을 유도할 수 있는 보호막 기술이 개발되고 있으며, 다양한 소재, 구조 및 설계 개념이 제안되고 있다. 이러한 보호막 기술의 이슈들을 소재 및 작동 원리에 따라 구분하여 요약하였다. 이들 연구들은 고성능 보호막의 구현을 위해 보호막/리튬계면 현상에 대한 깊이 있는 이해가 필요함을 시사한다.
만성 뇌졸중 환자에서 순환식 운동프로그램이 호흡근력과 폐기능에 미치는 영향: 사전연구
김희탁(Kim Hee Tak) 한국보건기초의학회 2018 한국보건기초의학회지 Vol.11 No.2
The study involved 20 chronic stroke patients who trained for six weeks by applying a circuit exercise program. The patients were measured before and after the training program for respiratory muscle strength (MIP and MEP) and pulmonary function (FVC, FEV1, FEV1/FVC). A total of six circuit exercise programs were applied. A paired t-test was performed to determine the difference in respiratory muscle strength and pulmonary function of the subjects. The significance level was set to α=0.05. Respiratory muscle strength (MIP and MEP) increased significantly after the circuit exercise program. Pulmonary function (FVC1, FEV1/FVC) was also significantly higher after training than before training. However there was no significant change in lung function (FVC). The circuit exercise program was effective in improving both respiratory muscle strength and pulmonary function in chronic stroke patients. It is anticipated that circuit exercise programs can be applied to chronic stroke patients to improve and speed up their recovery.
지역사회에 거주하는 만성 뇌졸중 환자의 몸통 근력 운동과 가동성 운동이 폐기능과 보행의 상관관계
김희탁(Kim Hee Tak) 한국보건기초의학회 2019 한국보건기초의학회지 Vol.12 No.1
The purpose of this study was to investigate the effects of a body strengthening and movement-based exercise program on chronic stroke patients. There was an emphasis on any changes to the patients’ pulmonary function, respiratory muscle strength, cardiorespiratory function, and their ability to walk. Twenty patients, 11 males and 9 females, performed trunk muscle exercises and mobility exercises twice a week for 8 weeks. The subjects had their pulmonary function and respiratory muscle strength measured before and after the exercise program. These data were then evaluated using a paired t-test. A Pearson’s correlation coefficient was also performed to investigate any connection between walking and cardiopulmonary function after the exercise program. It was decided to set the significance level at α=0.05. Pulmonary function (FVC, FEV1, FEV1/FVC%) and respiratory muscle strength (MIP, MEP) were significantly increased (p<0.05) by the exercise program. As for the effects on walking; 10m walking, velocity, and cadence were significantly changed (p<0.05). However, no significant difference in step time differential and step length differential (p>0.05) were found. Futhermore, the study discovered a positive correlation between velocity and respiratory muscle strength. In conclusion, a body strengthening and movement-based exercise program is an effective way to improve pulmonary function, respiratory muscle strength, and walking ability in chronic stroke patients.