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A Novel Direct Instantaneous Pressure Control of Hydraulic Pump System with SRM Drive
Jianing Liang,Dong-Hee Lee,Jin-Woo Ahn,Young-Joo An 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A novel direct instantaneous pressure control of hydraulic pump system with SRM drive is presented in this paper. The proposed hydraulic pump system embeds pressure controller and direct instantaneous torque control (DITC) controller. DITC controller can reduce inherent torque ripple of SRM, and develop a smooth torque, which can increase stability. The proposed hydraulic pump system has also fast step response and load response. At last the proposed hydraulic pump system is verified by computer simulation and experimental results.
Facial Expression Recognition Method Based on Residual Masking Reconstruction Network
Jianing Shen,Hongmei Li 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.3
Facial expression recognition can aid in the development of fatigue driving detection, teaching qualityevaluation, and other fields. In this study, a facial expression recognition method was proposed with a residualmasking reconstruction network as its backbone to achieve more efficient expression recognition andclassification. The residual layer was used to acquire and capture the information features of the input image,and the masking layer was used for the weight coefficients corresponding to different information features toachieve accurate and effective image analysis for images of different sizes. To further improve the performanceof expression analysis, the loss function of the model is optimized from two aspects, feature dimension anddata dimension, to enhance the accurate mapping relationship between facial features and emotional labels. Thesimulation results show that the ROC of the proposed method was maintained above 0.9995, which canaccurately distinguish different expressions. The precision was 75.98%, indicating excellent performance ofthe facial expression recognition model.
The Expert EFL Teachers' Language Operation in and beyond Third-turn Feedback
Jianing Yang 한국응용언어학회 2023 응용 언어학 Vol.39 No.1
This paper investigated how experienced English as Foreign Language (EFL) teachers adapt language when giving feedback, especially in large class sizes where learners have low language proficiency. Particular attention was paid to how teachers use language to extend learning opportunities and interactions to the whole class after completing the one-to-one Initiation-response-feedback (IRF) sequence. With the use of classroom videos and Conversation Analysis (CA) research methods, the feedback of three experienced EFL teachers was analyzed intensely. The results revealed that experienced EFL teachers were flexible in adjusting the tone and content of the feedback and, crucially, that in large classes of beginners in language learning. Teachers mostly offered another one-to-many question or interactive invitation immediately after the one-to-one IRF, which extended the learning opportunities and participation to the whole class, i.e., somehow enhancing the learning opportunities and participation of the whole class. Throughout this article, it is hoped that the language used by teachers in large classes mentioned therein will provide some reference and practical techniques for instructors in comparable situations, particularly in providing effective feedback.
Vehicle Detection at Night Based on Style Transfer Image Enhancement
Jianing Shen,Rong Li 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.5
Most vehicle detection methods have poor vehicle feature extraction performance at night, and their robustnessis reduced; hence, this study proposes a night vehicle detection method based on style transfer image enhancement. First, a style transfer model is constructed using cycle generative adversarial networks (cycleGANs). Thedaytime data in the BDD100K dataset were converted into nighttime data to form a style dataset. The datasetwas then divided using its labels. Finally, based on a YOLOv5s network, a nighttime vehicle image is detectedfor the reliable recognition of vehicle information in a complex environment. The experimental results of theproposed method based on the BDD100K dataset show that the transferred night vehicle images are clear andmeet the requirements. The precision, recall, mAP@.5, and mAP@.5:.95 reached 0.696, 0.292, 0.761, and0.454, respectively.
Series-Parallel Type Passive Boost Converter for 3-phase SRM
Jianing Liang,Seung-Hun Seok,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper presents a novel series-parallel type passive boost converter for 3-phase SRM. The proposed simple passive circuit added three diodes and one capacitor in the front-end of conventional asymmetric converter in order to obtain high negative bias. Based on this passive power network, the terminal voltage of the converter side is general dc-link voltage level in parallel mode and is u to double dc-link voltage level in series mode. So it can suppress the negative torque generation from the tail current and improve the output power. Combining passive circuit with 3-phase asymmetric converter, without the phase current overlap, the phase winding obtains the dc-link voltage in the demagnetization mode. With the phase current overlap, the dc-link voltage or double dc-link voltage is dependent on the overlap current. The operation modes of the proposed converter are analyzed with a 3-phase SR motor in detail. The compared simulation and experiments for conventional and proposed converter have been executed. And the results verify the performance of proposed converter.
Jianing Liang,김태형(Tae-Hyoung Kim),안진우(Jin-Woo Ahn),안영주(Young-Joo An) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper presents dynamic characteristics of super high speed SRM and it's drive. The nonlinear model of super high speed SRM is implement by Matlab/simulink and the simulation results show that the prototypeSRM can operate up 20,000[rpm]with stable performance.
DITC of SRM using 4-Level Converter
Jianing Liang,Zhen-Guo Lee(이진국),Dong-Hee Lee(이동희),Jin-Woo Ahn(안진우) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper proposes a DITC(Direct Instantaneous Torque Control) of SRM (Switched Reluctance Motor) using a novel 4-level converter for smooth torque control and high efficiency. DITC of SRM is very useful for smooth torque control, but the driving efficiency is low due to advanced current that does not produce torque. For the high efficiency control of SRM, fast excitation and demagnetization of phase current are required. A novel 4-level converter and a new control scheme are present to improve the driving efficiency. The proposed DITC of SRM using 4-1evel converter is verified by computer simulation.
A Novel Direct Instantaneous Pressure Control of Hydraulic Pump System with SR Drive
Jianing-Liang,Tae-Hyoung Kim,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
This paper proposes a novel direct instantaneous pressure control(DIPC) of hydraulic pump system with SR drive. And it has very simple control structure, because it doesn’t use any speed and torque control for adjusting pump pressure. The hysteresis band of pressure and proper switching rules can make the actual pump pressure to be constant with fast dynamic response. Therefore, the proposed DIPC method can control of hydraulic pump pressure steadily with fast dynamic response.