The Research of Power Frequency Interference in the Acquisition System of SEMG

Hanqing Zhao,Bo You,Yi Liu,Shoutong Tao 보안공학연구지원센터(IJSIP) 2013 International Journal of Signal Processing, Image Vol.6 No.5

區塊鏈技術與中國古代文物保護:打造透明、可追溯的文化遺產管理系統

Si HanQing 한양대학교(ERICA캠퍼스) 한국미래문화연구소 2023 미래문화 Vol.0 No.7

This paper discusses in detail the specific applications and potential of blockchain technology in the management and conservation of ancient Chinese cultural relics. The paper begins with a detailed discussion and analysis of the fundamentals and potential applications of blockchain technology in cultural heritage conservation, taking into account the unique and precious value and conservation needs of ancient Chinese cultural relics. It identifies and highlights the current challenges of adopting blockchain technology to improve the transparency, traceability, and security of cultural heritage management, as well as the broad prospects of blockchain technology in the future. In addition to proposing a blockchain-based mechanism for recording and authenticating cultural heritage, this study advocates for advancing heritage conservation by facilitating community participation and effectively addressing technical and legal issues. Finally, the potential long-term impact of these applications on heritage conservation and sustainability is explored in depth, laying the groundwork for future related research.

기후변화 교육을 위한 북극과 남극 가상현실 탐험

류한칭 ( Hanqing Liu ),박경신 ( Kyoung Shin Park ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2

환경 문제는 사람들이 직접적으로 보지 못하면 쉽게 이해하기 어렵다. 그리고 오랜 시간 동안 아주 조금씩 환경 파괴가 발생하는 경우가 많기 때문에, 실질적으로 환경 문제를 체감하는 것이 쉽지 않다. 본 연구에서는 몰입형 가상현실 시스템을 이용해서 기후변화의 원인인 지구온난화로 인해 북극과 남극의 바다 빙하가 녹고 있는 문제를 체험할 수 있도록 Melting Sea Ice 를 개발하였다. 사용자들은 몰입형 가상현실 장치를 착용하고 시간의 흐름에 따라 남극 북극 빙하가 녹은 모습과 해빙에 따른 생태 환경의 변화를 직접 돌아다니면서 관찰할 수 있다. 본 연구에서는 Melting Sea Ice 가상 현실 콘텐츠를 통하여 기후 변화로 인한 환경 파괴 문제를 직관적으로 인식시키고 환경 문제를 해결하고자 하는 동기부여를 목적으로 두고 있다.

The game of safety behaviors among different departments of the nuclear power plants

Da Yuan,Hanqing Wang,Jian Wu 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3

To study the developments and variations of unsafe behaviors in nuclear power plants thus reduce thepossibility of human-related accidents, this paper, based on the Game Theory, focused on the changes inbenefits of the Department of Management, Operational and Emergency in a nuclear power plant, andestablished the expected revenue functions of these departments. Additionally, the preventive measuresof unsafe behaviors in nuclear power plants were also presented in terms of these 3 departments. Resultsshowed that the violations of the Operation Department (OD) and the Emergency Department (ED) werenot only relevant with the factors such as their own risks, costs, and the responsibility-sharing due toaccidents, but also affected by the safety investments from the Management Department (MD). Furthermore, results also showed that the accident-induced responsibility-sharing of both the OD andthe ED would rise, if the MD increased the investments in safety. As a result, the probability of violationbehaviors of these 3 departments would be attenuated consciously, which would reduce the unsafebehaviors in the nuclear power plants significantly

Modeling and Emulation of 3d Dither Stability in Orthogonal Turn-Milling

Yueqi Guan,Hanqing Guan,Gaoshen Wang,Rongling Chen 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6

Aiming at 4-axial orthogonal turn-milling by end mill, its theoretical 3d model for stable range of dither was put forward on the basis of its cutting principle by using analytical method. Based on modal trial, the stable range leaf figure of end mill’s dither in 4-axial turn-milling with eccentricity was simulated and analyzed. The results show that besides geometrical shape of mill, material of workpiece and frequency response function of machine-tool’s structure etc that can produce dither in 4-axial turn-milling, the rotating speed of mill and cutting depth are also related to dither. In trial of 4-axial turn-milling by end mill, the results of cutting force spectrum analysis show that: cutting is stable and un-dither when frequency of cutter tooth cutting-in plays leading role in force spectrum. Dither is produced when modal frequency of system plays leading role in force spectrum, the measured value of cutting force and surface roughness are also higher than those in the condition of un-dither. Thus the theoretical model and results of emulation can predict stability of end mill’s dither in 4-axial orthogonal turn-milling with eccentricity correctly and can provide theoretical guidance for surface quality and processing efficiency of workpiece.

Joint Space-time Coding and Power Domain Non-orthogonal Multiple Access for Future Wireless System

( Jin Xu ),( Hanqing Ding ),( Zeqi Yu ),( Zhe Zhang ),( Weihua Liu ),( Xueyan Chen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

According to information theory, non-orthogonal transmission can achieve the multiple-user channel capacity with an onion-peeling like successive interference cancellation (SIC) based detection followed by a capacity approaching channel code. However, in multiple antenna system, due to the unideal characteristic of the SIC detector, the residual interference propagated to the next detection stage will significantly degrade the detection performance of spatial data layers. To overcome this problem, we proposed a modified power-domain non-orthogonal multiple access (P-NOMA) scheme joint designed with space-time coding for multiple input multiple output (MIMO) NOMA system. First, with proper power allocation for each user, inter-user signals can be separated from each other for NOMA detection. Second, a well-designed quasi-orthogonal space-time block code (QO-STBC) was employed to facilitate the SIC-based MIMO detection of spatial data layers within each user. Last, we proposed an optimization algorithm to assign channel coding rates to balance the bit error rate (BER) performance of those spatial data layers for each user. Link-level performance simulation results demonstrate that the proposed time-space-power domain joint transmission scheme performs better than the traditional P-NOMA scheme. Furthermore, the proposed algorithm is of low complexity and easy to implement.

A Hierarchical Approach for Background Modeling and Moving Objects Detection

Jie Yang,Jinqiao Wang,Hanqing Lu 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.5

In this paper, we propose a hierarchical approach for background modeling and moving objects detections in the intelligent visual surveillance system. The proposed approach models the background in block level and pixel level hierarchically, and the background is represented by texture information in block level and by color information in pixel level respectively. Meanwhile the variable parameters learning rate is proposed to speed up the convergence of the model parameters in the pixel model. The proposed approach provides us with many advantages compared to the state-of-the-art. Experimental results demonstrate the effectiveness and efficiency of the proposed approach.

Mechanical Properties and Strengthening Mechanism of Aluminum Matrix Composites Reinforced by High-entropy Alloy Particles

Kaiguang Luo,Shilei Liu,Hanqing Xiong,Yun Zhang,Charlie Kong,Hailiang Yu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.11

1 − 6 wt% Al0.5CoCrFeNihigh-entropy alloy particles (HEAp)/AA1050 aluminum matrix composites (AMCs) were preparedby stir casting process. The effect of HEAp mass fractions on microstructure and mechanical properties of the AMCswas studied. The results showed that with the increase in HEAp, the grains were obviously refined, and the ultimate tensilestrength (UTS) was gradually increased. The AA1050 − 3 wt% HEAp AMCs had the optimum mechanical properties. ItsUTS was 115 MPa and its elongation was 32.1%. The fracture mechanism of composites changed from ductile fracture toquasi-cleavage fracture with more HEAp. A theoretical model for predicting the yield strength of composites was established. The theoretical values were in good agreement with experimental results, and the average error between theoreticaland experimental values was 4.2%.

Thermal Gradient–Dependent Strain Behavior of Contacted Soil Specimens Subjected to Freeze–Thaw

Xiaodong Zhao,Zhiyuan Lv,Hanqing Sun 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.3

Soil specimens were initially prepared by freezing with a thermal gradient (Fnonuni) and then thawing under uniform temperature (Tuni), then the strain behaviors of which using digital processing technique (DPT)–aided unconfined compression on contacted specimens were investigated. Although the specimen treated under Fnonuni - Tuni exbihted a strength over 1.8 times higher and a specimen scale–based (S–) lateral strain over 0.3 times smaller than that treated under freeze–thaw with uniform temperatures Funi - Tuni, it exhibited a relatively greater local scale–based (L–) strain level under identical S–axial strain, and dominated the deformation process of the specimen assembly. The characteristic of L–strain relationship between top and bottom specimens under Fnonuni - Tuni and specimens under Funi - Tuni approached identical when S–axial strain exceeded a threshold corresponding to the peak strength. Further, an asymmetric L–strain gradient at two sides of the fractured surface in specimens was observed, and it was more evident in specimens treated under Fnonuni - Tuni. These test data and observations obtained have been validated by detailed comparisons with previous studies, and contribute to build a constitutive model considering nonlocal variable and thus improve the settlement prediction precision of the thawed soils.

Cavitation cloud dynamic characteristics of dual-chamber self-excited oscillatory waterjet

Dezheng Li,Yong Kang,Hanqing Shi,Yi Hu,Qi Liu,Hongchao Li,Jincheng Hu,Jiamin Li 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12

Aiming to enhance self-excited oscillating cavitation jet performance, the effect of the dual-chamber nozzlestructure on the jet dynamical characteristics was designed and investigated. With high-speed camera technology,the cavitation phenomenon was investigated to analyze the area pattern and shedding period of the cavitation cloudunder different nozzle structures. The results showed that the dual-chamber nozzle significantly improved the jet cavitationstrength, and the cavitation cloud area increased by 76% and decreased the shedding period by 90% comparedwith the single-chamber nozzle. In the upstream chamber, the upper shrinkage ratio had a more drastic effect on thecavitation cloud area and shedding frequency than the lower shrinkage ratio with a more sensitive effect on the sheddingfrequency. In the downstream chamber, the outlet diameter ratio and chamber diameter were more sensitive tothe regulation of cavitation cloud shedding frequency and area, respectively, with the optimal regulation at the outletdiameter ratio of 1 and chamber length of 6 mm. The chamber diameter modulated the cavitation cloud most drasticallywith a comprehensive performance optimum at 12mm, which the area fluctuation reached 76.8%. The resultsprovide a basis for further research and application of dual-chamber nozzles.