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Tuning of electrical properties in correlated transition metal oxides for electronics
손준우 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Correlated transition metal oxides have attracted considerable attention due to a remarkable array of functionalities that stem from the strong correlations between the localized transition metal valence d electrons. One of the representative functionalities in transition metal oxides includes abrupt phase transition under external stimuli, e.g. metal-insulator transition, in correlated electron systems. The uniques property can be applicable to the electronic devices for steep electronic switch, such as the logic and memory devices with high on/off ratio, the selector devices for 3D cross point memory. In this presentation, I will represent our recent result to realize unconventional electronic devices, such as the steep selector devices and synaptic analog devices for neuromorphic application, using correlated oxides, such as NbO2, NdNiO3 etc.
부분 자율주행자동차의 운전자 모니터링 시스템 안전기준 검증을 위한 운전 행동 분석 -1부-
손준우,박명옥 사단법인 한국자동차안전학회 2021 자동차안전학회지 Vol.13 No.1
This study aimed to verify the criteria of the driver monitoring systems proposed by UNECE ACSF informal working group and the ministry of land, infrastructure, and transport of South Korea using driving behavior data. In order to verify the criteria, we investigated the safety regulations of driver monitoring systems in a conditional autonomous vehicle and found that the driver monitoring measures were related to eye blinks times, head movements, and eye closed duration. Thus, we took two different experimental data including real-world driving and simulator-based drowsy driving behaviors in previous studies. The real-world driving data were used for analyzing blink times and head movement intervals, and the drowsiness data were used for eye closed duration. In the real-world driving study, 52 drivers drove approximately 11.0 km of rural road (about 20 min), 7.9 k m of urban road (about 25 min), and 20.8 k m of highway (about 20 min). The results suggested that the appropriate number of blinks during the last 60 seconds was 4 times, and the head movement interval was 35 seconds. The results from drowsy driving data will be presented in another paper - part 2.
Impact of Traffic Environment and Cognitive Workload on Older Drivers’ Behavior in Simulated Driving
손준우,이용태,김만호 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
As the use of in-vehicle technologies became more popular, there is concern about a concomitant increase in driver distraction arising from their use. While the introduction of voice recognition systems is intended to reduce the distraction due to manual operation of these units, a significant proportion of the distraction associated with their use may arise not from the manual manipulation but rather the cognitive consequences. It is also known that the risk of inattentive driving varies with age. In this study, the impact of cognitive workload and traffic environments on older drivers' behavior was investigated in a driving simulator. To assess the impact of advancing age on driving performance degradation under a dual task condition, the performance of 63 drivers, divided into younger (20–29) and older (60–69) age groups, was evaluated. The authors also considered driving behavioral differences in the context of urban and highway driving, appropriately counterbalanced. At a specified location in the two scenarios, subjects were asked to complete a series of auditory tasks of increasing complexity. Comparisons of younger and older drivers’ driving performance, including forward velocity, speed control, standard deviation of lane position and steering wheel reversal rate, were conducted. Results indicated that age and traffic environment impact both driving performance and compensatory behavior during dual task conditions.