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- 저자 : 박정진 (검색결과 521 건)
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박정진 대한산업공학회 2021 대한산업공학회지 Vol.47 No.3
Events at nuclear power plants are very rare. It is not easy to find lessons with the existing methods of carrying out improvement activities based on lessons learned from the event. In addition, high reliability systems are quite vulnerable to human error. So human performance require periodic management. For the managing human performance, most nuclear power plants identify the weak points and seek to improve human performance. Also, they evaluate and give feedback on human performance levels through periodic monitoring. In this paper, the major causes and upper control limit were selected for trend analysis in human performance related events at nuclear power plants in 2019. In addition, additional analysis was conducted in subjects exceeding the upper control limit. So several insights were discovered and corrective actions will be conducted to improve human performance in nuclear power plant.
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Implementation of Neuromorphic System with Si-based Floating-body Synaptic Transistors
박정진,김형진,권민우,황성민,백명현,이정준,장태진,박병국 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.2
We have developed the neuromorphic system that can work with the four-terminal Si-based synaptic devices and verified the operation of the system using simulation tool and printed-circuit-board (PCB). The symmetrical current mirrors connected to the n-channel and p-channel synaptic devices constitute the synaptic integration part to express the excitation and the inhibition mechanism of neurons, respectively. The number and the weight of the synaptic devices affect the amount of the current reproduced from the current mirror. The double-stage inverters controlling delay time and the NMOS with large threshold voltage (VT) constitute the action-potential generation part. The generated action-potential is transmitted to next neuron and simultaneously returned to the back gate of the synaptic device for changing its weight based on spike-timing-dependent-plasticity (STDP).
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박정진,김혜린,강윤구 대한치과교정학회 2023 대한치과교정학회 임상저널 Vol.13 No.1
Horizontally impacted mandibular second molar is a rare but challenging situation for clinicians. Many treatment modalities were proposed and presented in articles that include use of surgical repositioning, orthodontic traction and uprighting, autotransplantation, extraction and etc. The proper treatment method decision is upon case-by-case observation as like other orthodontic decisions. This case report is aimed to present another biomechanical option utilizing TMA spring attached to the mandibular main archwire to provide distal uprighting force to the horizontally impacted mandibular second molar. aTwo successfully treated cases are presented treated with the proposed treatment modality.
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