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임준영,김동주,유영환 한국통신학회 2023 韓國通信學會論文誌 Vol.48 No.3
Although the demands for local 5G network has increase along with the 4th industrial revolution, current network operation techniques and systems cannot efficiently manage local 5G networks, and suitable system for those networks are necessary. Therefore, we propose a deep reinforcement learning based caching system to reduce backhaul overload and increase user QoS in local 5G for efficient network resource utilization in eMBB targeted local 5G networks. The proposed system considers replacement policies in the stage of cache allocation, and its performance is compared with existing caching strategies combined with cache allocation algorithm and cache replacement policy. The simulation result shows the proposed system has 20% higher performance in both cache hit ratio and average network latency than conventional systems.
임준영,주석원,김규리,이채은,김유리,송윤규 한국과학기술원 반도체설계교육센터 2023 IDEC Journal of Integrated Circuits and Systems Vol.9 No.1
This paper proposes a triboelectric nanogenerator (TENG) touch sensor combined with a spike detecting system capable of recognizing minute touches. Considering the characteristics of wearable and tactile-based architectures in TENG devices, the low power consumption and small implementation area of the IC are required. A non-linear energy operator which is used for the spike detection system replaces the digital logic with additional circuits and avoids the need for additional circuitry for signal processing. The resulting recording system built in a standard 180 nm CMOS technology can measure the signal from 0.1 Hz to 7 kHz, meanwhile, detect spikes generated by the TENG device. The system has a supply voltage under 1.2 V and powers 22.56 μW while maintaining an acceptable noise level and a total IC area of 1 mm × 1 mm, including input-output pads.
레이트 자이로를 이용한 유연한 로봇팔의 진동제어에 관한 연구
임준영,박인오,오준호 대한기계학회 1990 대한기계학회논문집 Vol.14 No.5
본 연구에서는 선단의 각속도를 측정하여 궤환함으로써 유연한 로봇팔의 진동 을 억제함과 동시에 선단의 위치를 제어하고자 한다. 선단에 레이트 자이로를 설치 하여 선단의 각속도를 측정하였다. 레이트 자이로는 이미 비행체의 제어에 널리 사 용되고 있는 정밀 각속도 센서로 소형이면서 가벼워 회전 진동측정이 매우 쉽고 편리 한 장점이 있다. 또한 유연한 로봇팔을 선단에 집중질량이 있는 오일러보로 가정하 여 모델링을 하였으며, 실험에서는 1차진동 모드까지만 고려하였다. The end tip position control of a flexible robot arm has been presented by utilizing the feedback signal from the rate-gyro mounted at the end tip. Kalmann filter and the state feedback gains were determined by optimal sense based upon the parameter from the geometrical and electrical data of the flexible arm system. The simulation and experiment were performed and it has been proved that implementation of the rate-gyro drastically improves the performance.