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음압에 의해 생성된 멍 촬영을 위한 적외선 광원과 필터 조합에 관한 연구
김주은(Ju-Eun Kim),김지연(Ji-Yeon Kim),전소영(So-Young Jeon),김은아(Eun-A Kim),유제설(Je-Seol Yu) 한국콘텐츠학회 2016 한국콘텐츠학회논문지 Vol.16 No.11
학대나 폭력을 입증할 수 있는 증거 중 하나인 멍은 크게 외력에 의한 것과 음압에 의한 것으로 나뉜다. 외력에 의해 생성된 멍에 관한 연구는 많지만, 음압에 의해 생성된 멍에 관한 연구는 적다. 적외선 광원으로 멍을 촬영한 선행연구들을 살펴보면 하나의 적외선 광원과 필터만을 사용하여 실험했다는 문제점이 있다. 본 실험의 연구자들은 적외선 광원과 필터의 조합에 따라 멍의 촬영 결과물이 다른 양상을 보일 것으로 생각하였다. 따라서 세 종류의 적외선 광원과 다섯 종류의 적외선 필터를 사용하여 음압에 의해 생성된 멍을 촬영하는데 최적의 조합을 찾고자 하였다. 그 결과 750 nm 영역을 포함하는 텅스텐과 이 영역을 투과시키는 필터인 Kodak Wratten #18A를 사용했을 때 가장 좋은 결과를 얻을 수 있었다. Bruise caused by damages through physical compression and suction is one of evidences that can prove abuse or assault. It is essential for taking photography to prove a crime. Some studies about the Infrared (IR) light source have limitations that only one IR light source and one barrier filter were used. To find the best combination of filters and IR light sources, we produced suction bruise artificially and used three IR light sources and five barrier filters. Consequently, we found that the best combination is using a tungsten lamp and Kodak Wratten #18A barrier filter.
Active noise reduction system using multi-channel ANC
Tae-Ho Jung,Jung-Hee Kim,Kyoung-Jae Kim,Sang-Won Nam 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper, we propose an active noise reduction system (ANRS) for active noise barriers (ANB) along with a 2x2x2 multi-channel active noise control (ANC) technique. The ANRS, a Y-shaped structural device, operates as a cost-effective ANC system which can be easily installed on the top of existing passive noise barriers. To reduce the diffracted noise behind the barriers, we focus on sound pressure reduction in the diffraction edges near the error microphones, which behaves like virtual sources (see Fig. 2. for details). It is demonstrated that the diffracted noise can be reduced effectively. Finally, the performance of the ANRS is verified experimentally by utilizing several noise sources in the anechoic chamber.
Andrey G. Troshin,Cha SangGon,Kim DongHwan 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Research results for LMS-based algorithms performances using real records of the traffic noise are discussed. The various algorithms based on LMS method are studied regarding their convergence speed and noise reduction index. Most effective algorithms are chosen for implementation in the active noise control barriers. The optimal step size, and number of adaptive filter taps are addressed during parametric study of the algorithms.
Kang Yang,Lin Zhao 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.7
In this paper, a novel backstepping control method based on command filter is proposed for the trajectory tracking control of flexible joint manipulator systems with full-state constraints. Firstly, in order to solve the problem of calculating complexity caused by repeating differential of virtual control in traditional backstepping, the command flier is used. Then, the filtering error compensation mechanism is established to compensate filtering errors caused by the command filter, and the full states of system will not exceed the constraints by using barrier Lyapunov functions in virtual control design. It is shown that the given scheme can make joint position tracking error exponentially converge to the origin by using Lyapunov stability theorem. The effectiveness of this scheme is verified by using numerical simulation at last.
Yannan Bi,Zhipeng Shen,Qun Wang,Haomiao Yu,Chen Guo 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.12
This article investigates the adaptive tracking control problem for the marine surface vessels (MSVs) with unknown uncertainties and multiple constraints. Firstly, a novel prescribed performance-based time-varying asystematic barrier Lyapunov function (PP-TABLF) is proposed to control the MSVs to navigate in a variable narrow waterway and to improve the transient performance of MSVs. Secondly, the predictor-based radial basis function neural networks (P-RBFNNs) are developed to approximate the system uncertainties and external disturbances. Specifically, the tracking errors of the RBFNNs are estimated in advance, and the prediction errors are utilized to update the RBFNNs and improve the estimation precision. The command filter and the idea of the recursive sliding mode are integrated with the control law to limit the amplitude of the virtual control signals and to reduce the computational burden. With the proposed control scheme, tracking errors will not override the prescribed performance ranges, and the control force will not be violated in the presence of total unknown uncertainties. Finally, the semi-global uniformly ultimate boundedness of the system is guaranteed by the proposed control scheme, and the simulation results are given to further demonstrate the effectiveness of the proposed approach.
Comparative Studies on Soot Oxidation by Nitrogen Dioxide and Ozone
C. Purushothama,Xin-hong Chen,Ming wei Li,Jae-ou Chae,Ju-hyen Sim 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Non-thermal plasma technology has many applications in various areas. One of the applications is regenerating diesel particulate filter (DPF). DPF is a widely applied device to control the particulate emission of diesel engines. But it needs periodic removal of clogged soot for the smooth running of engine. Conventional high-temperature removal processes easily leads to the breakage of DPF. Herein, low-temperature plasma formed in a dielectric barrier discharge (DBD) reactor was used to form active oxidants such as ozone and nitrogen dioxide. Experimentally, the effects of discharge power and frequency on the performance of DBD reactor were studied. Two oxidants, O₃ and NO₂, were synthesized and used for incinerating soot in the used DPF. Performances of the two oxidants on the reduction of soot were compared, and it was found that NO₂ is more effective than O₃ for getting rid of soot
Fundamental study of NOx removal from diesel exhaust gas by dielectric barrier discharge reactor
Tran Quang Vinh,Shuya Watanabe,Tomohiko Furuhata,Masataka Arai 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.6
Due to increasingly stringent emission legislation, it is essential to find a solution of eliminating nitrogen oxides (NOx) from diesel exhaust gas. Non-thermal plasma (NTP) approach has been studied for years and has shown advantages. In this study, NOx removal from simulated diesel exhaust gas by a dielectric barrier discharge needle-to-cylinder reactor under room temperature condition is presented. The dielectric barrier consists of a diesel particulate filter (DPF) putting in the discharge field. A simulation gas of N2, NO and O2 combined with particulate matters (PM) was used as the test gas. PM was loaded from a diffusion flame PM generator. The effect of PM and oxygen fraction in exhaust gas on NOx removal characteristics was investigated experimentally. The results showed that PM promoted NOx removal reactions in the barrier discharge field but its effect was dropped following elapsed time. In addition, for PM composition,soluble organic fractions and sulphate were decreased with NOx removal. Besides, the chemical reaction mechanism inside reactor was discussed.
최정일(Jeong Il Choi),박경원(Kyung Won Park),조현기(Hyun Gi Cho),남현도(Hyun Do Nam),신은우(Eun Woo Shin) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
In this paper, active noise barriers for attenuation of road noise are proposed. multi-channel audio systems, DAQ part and high performance DSP H/W were designed. Active noise control firmware programs were implemented for multi-channel off-line/on-line estimation methods for secondary path transfer functions and FIR/IIR filter structure are used main noise control algorithms. To evaluate performance of proposed systems, the experiments were performed in an active noise barrier test bed for various noise cases.