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Jeong, Ji-hun,Eom, Junseong,Lee, Seung S.,Lim, Dong Wan,Jang, Yong Ik,Seo, Kyoung Woong,Choi, Seong Soo,Lee, Chun Jae,Oh, Jong Soo Elsevier 2018 Sensors and actuators. A Physical Vol.279 No.-
<P><B>Abstract</B></P> <P>In this research, a miniature mechanical SAD (Safety and Arming Device) with arming delay was developed for actual munitions application. Reliable arming delay performance was achieved by applying a runaway escapement system that operates by a rack-and-pinion motion. The miniature mechanical SAD was fabricated using a stainless steel wet etching process that provided not only miniaturization but also a high processing yield. The miniature mechanical SAD performed successfully under the desired safety and arming conditions in lab tests and showed fine agreement with the finite element method simulation results. Field tests were performed with a grenade launcher to validate its performance under the actual firing conditions. One hundred samples that were shot 23.6 m (safety distance) and 200 m (arming distance), and every specific test criterion was met successfully. The new SAD was also found to be appropriate for safe use in artillery fuzes by conducting environmental tests under a variety of temperature, vibration, and impact conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Miniature mechanical safety and arming device is proposed for actual munition firing. </LI> <LI> Reliable arming delay performance was achieved by runaway escapement mechanism. </LI> <LI> Compact design of the device was available by stainless steel wet etching process. </LI> <LI> The device showed successful safety and arming performance under actual field tests. </LI> <LI> The device found to be appropriate under variety of environmental conditions. </LI> </UL> </P>
Junseong Ahn(안준성),Jun-Ho Jeong(정준호),Inkyu Park(박인규) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Hierarchical structures that can improve a device performance by the synergistic effects of the micro/nano multi-scale structures have attracted much attention in various fields such as biomimetic structure and electronic devices. However, fabrication of the hierarchical structure with controllable morphology is still limited owing to their structural complexity, and it hinders their further applications. Herein, to overcome these limitations, a morphology-controllable wrinkled micro/nano hierarchical structure (WHS) was developed by integrating micropattern, nanopattern, and wrinkle on a single substrate. The developed fabrication method allows each structure to be individually controlled, resulting in the unlimited design diversity. Additionally, it was utilized as a superhydrophobic triboelectric nanogenerator (S-TENG). The S-TENG showed superior contact angle characteristics and improved triboelectric effects compared with a film structure because the highly rough surface of the WHS can enhance the hydrophobicity and triboelectric effects. Finally, it was applied to self-powered and water-repellent cough detection sensor.
손정설(Jeong Seol Son),이혁(Hyuck Yi),김준성(JunSeong Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
PDRS는 직전 위치로부터 움직인 거리와 진행방향을 보행자의 위치를 추정한다. IMU 센서를 활용한 Step-and-Heading 방식의 PDRS에서는 보행자의 회전으로 인한 오차가 가장 크게 나타나며 대부분의 시스템에서는 회전각도를 판별하기 위해 IMU 센서의 배치상태를 제한한다. 본 논문에서는 IMU 센서에 작용하는 중력가속도 성분과 보행자의 운동 특성 사이의 관계를 활용하여 IMU 센서를 특정 위치에 고정시키지 않고도 보행자의 진행방향과 회전각도를 안정적으로 판별할 수 있는 방법을 제안한다.