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Gate Conduction Mechanism in Nonvolatile-Dynamic Random Access Memory (NVDRAM) Cell Transistors
정형 이,홍식 민 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.3
The gate conduction mechanisms in polysilicon-oxide-nitride-oxide-silicon (SONOS) transistors for non-volatile dynamic random access memory (DRAM) having lightly-doped drain (LDD) structure have been investigated by utilizing the threshold voltage shift (Vth) method. It is found that the gate conduction in SONOS transistors is mainly determined by a specific tunneling process depending on the voltage drop (VOX) across the tunnel oxide. It is also shown that the gate conduction mechanism through the ONO dielectric makes a smooth transition from one tunneling process to another according to the relationship between the VOX and tunneling barrier height (B).
Impaired Hand Dexterity Function in a Non-human Primate Model with Chronic Parkinson’s Disease
Jincheol Seo,Jinyoung Won,Keonwoo Kim,박정형,Hyeon-Gu Yeo,김유경,Seung Ho Baek,이훈원,Chang-Yeop Jeon,최원석,Sangil Lee,Ki Jin Kim,Sung-Hyun Park,손영훈,Kang-Jin Jeong,임경섭,Philyong Kang,이활용,손희창,허재원,김영현,이동석,이상래,최지웅,이 한국뇌신경과학회 2020 Experimental Neurobiology Vol.29 No.5
Symptoms of Parkinson’s disease (PD) caused by loss of dopaminergic neurons are accompanied by movement disorders, including tremors, rigidity, bradykinesia, and akinesia. Non-human primate (NHP) models with PD play an essential role in the analysis of PD pathophysiology and behavior symptoms. As impairments of hand dexterity function can affect activities of daily living in patients with PD, research on hand dexterity function in NHP models with chronic PD is essential. Traditional rating scales previously used in the evaluation of animal spontaneous behavior were insufficient due to factors related to subjectivity and passivity. Thus, experimentally designed applications for an appropriate apparatus are necessary. In this study, we aimed to longitudinally assess hand dexterity function using hand dexterity task (HDT) in NHP-PD models. To validate this assessment, we analyzed the alteration in Parkinsonian tremor signs and the functionality of presynaptic dopaminergic neuron using positron emission tomography imaging of dopamine transporters in these models. In addition, a significant inverse correlation between HDT and DAT level was identified, but no local bias was found. The correlation with intention tremor signs was lower than the resting tremor. In conclusion, the evaluation of HDT may reflect behavioral symptoms of NHP-PD models. Furthermore, HDT was effectively used to experimentally distinguish intention tremors from other tremors.