중국의 공유자전거 플랫폼 전환의도에 관한 연구: 신뢰와 불신의 메커니즘

Wenlong Lu,서영호(Yung Ho Suh),이새봄(Sae Bom Lee) 한국컴퓨터정보학회 2023 韓國컴퓨터情報學會論文誌 Vol.28 No.7

소비자 신뢰는 공유 경제 발전에 중요한 역할을 한다. 본 연구는 소비자 신뢰에 영향을 미치는 요인을 중점적으로 다루며, 중국의 자전거 공유 산업에서 선두였던 오포(OFO)의 사례를 살펴보았다. 본 논문은 오포의 내부 경영 문제와 거의 파산상태에 이르기까지 소비자 신뢰의 하락을 분석합니다. 2018년 12월부터 오포가 직면한 환불의 어려움 문제는 계속해서 커져 왔으며, 본 연구는 이 상황을 배경으로 신뢰/불신에 영향을 주는 영향 요인들을 살펴보았다. 제품 요인(품질), 플랫폼 요인(결제 보안, 개인 정보 보호, 명성), 사회적 요인(사회 규범, 정부 규제)을 독립변수로 고려하여 소비자 신뢰에 영향을 미치는 요인을 분석합니다. 분석 결과, 공유 자전거에 대한 소비자의 불신이 커지면 전환의도가 높아지며, 회사의 평판과 사회적규범은 신뢰와 불신에 모두 영향을 미치고, 정부규제는 신뢰에 영향을 미친다는 것을 확인하였다. 연구 결과는 공유 경제 플랫폼에 시사하는 바가 있으며 향후 연구를 위한 지침을 제공할 수 있을 것으로 기대된다. Consumer trust plays a crucial role in the development of the sharing economy. This study primarily focuses on the factors influencing consumer trust and examines the case of ofo, a former leader in Chinas bike-sharing industry. This paper analyzes the decline in consumer trust in ofo, which can be attributed to internal management issues and the near-bankruptcy situation. The difficulty in refunds issue faced by ofo since December 2018 has been growing continuously, and this study explores the factors influencing trust and distrust in this context. By considering product factors (quality), platform factors (payment security, privacy protection, reputation), and social factors (social norms, government regulation) as independent variables, the study analyzes the factors affecting consumer trust. The analysis results revealed that as consumers distrust towards shared bikes increases, their switching intention also increases. The companys reputation and social norms were found to influence both trust and distrust, while government regulation was found to influence trust. The research findings provide insights relevant to sharing economy platforms and offer guidance for future studies.

Factors Affecting Switching Intention through Trust and Distrust: Focusing an ofo Shared Bike Platform

( Wenlong Lu ),( Yung-ho Suh ) 한국품질경영학회 2019 한국품질경영학회 학술대회 Vol.2019 No.-

With the rapid development of sharing economy, consumer/user trust has become a major factor in its development. Studying the factors affecting the trust of consumers and users will be of great benefit to the development of sharing economy. As a former leader in the bike-sharing field, Ofo has gone from being ubiquitous in the streets to losing consumer trust in the past two years. There have been internal management problems, and the decline of user and consumer trust is leading to the current near-bankruptcy situation. This paper takes ofo as a case to analyze the factors affecting consumer trust/distrust in this bike-sharing market. First, this paper sums up the theory of the consumer trust, combining with China's present situation of sharing economy and the characteristic of the ofo's shared bike(problems), Secondly, four aspects such as personal factors (propensity to trust, propensity to distrust, price sensitivity), product factors (product quality, product availability), platform factors (perceived privacy protection, perceived payment security, reputation), social factors (social norms, government regulation) are considered as the independent variables. Since December 2018, the problem of ofo's 'difficult to refund' has been continuously growing. This study takes this event as a serious factor and from this perspective, focuses on the influencing factors that affect trust/distrust, which in turn leads to switching intention.

Highly aligned indium zinc oxide nanowire-based artificial synapses with low-energy consumption

Lu Liu,Binbin Cui,Wenlong Xu,Yao Ni,Shuo Zhang,Wentao Xu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-

Emulating neural activities at individual synapse level has recently attracted tremendous attention. Here,we demonstrate design and fabrication of thefirst digitally aligned nanowire (NW)-based three-terminalsynaptic transistor. The highly-aligned and individually-position-controlled long continuous indium zincoxide (IZO) NW arrays were directly printed on a large area with low cost using a specialelectrohydrodynamic nanowire printing (e-NWP) process. The NWs printed by e-NWP with a diameterof 250 nm emulated the structure of nervefibers. The device emulates plasticity of biological synapsesand showed remarkable advantages in energy consumption compared with previous reports. Uniqueband-edge modulation along the NW axial direction underlies makes excellent electrical properties ofthe device. This approach paves the way to easy fabrication of printed-NW-based artificial neuralnetworks.

The influence of high-temperature nitridation process on the crystalline quality of semipolar (1122) GaN epitaxial films

Li Wenlong,Wang Lianshan,Chai Ruohao,Wen Ling,Lu Haixia,Wang Huanhua,Yang Shaoyan,Sun Wenhong 한국물리학회 2022 Current Applied Physics Vol.39 No.-

Semipolar (1122) GaN epitaxial films were grown on m-plane sapphire substrates by metal-organic chemical vapor deposition and additional high-temperature nitridation was introduced during the growth. The growth mechanism, surface microtopography, and the full width at half maximum (FWHM) of X-ray rocking curves (XRCs) of on-axis and off-axis (1122) GaN planes were investigated. The results demonstrate that additional high-temperature nitridation process could reduce surface roughness and anisotropy, and suppress the other orientations, and partially improve the crystalline quality of (1122) GaN epitaxial films. The XRCs FWHM of the off-axis (1122) GaN planes decrease and show a different varying tendency after additional high-temperature nitridation process associated with the partial dislocations and basal plane stacking faults (BSFs). The results of the modified Williamson-Hall (W–H) analysis and photoluminescence spectrum show the BSFs increased while the partial dislocations decreased after an additional high-temperature nitridation process. The improvement of crystalline quality was mainly correlated to the reduction of partial dislocations.

An Improved Model Predictive Torque Control Strategy of a Shearer Semi-direct Permanent Magnet Synchronous Motor Based on Duty Cycle

Du Wenlong,Li Wei,Lu En,Sheng Lianchao,Chen Yuming,Jiang Song 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5

In order to improve the stability of low-speed and high-torque permanent magnet synchronous motor control in the shearer semi-direct cutting system under large load fl uctuation and strong impact conditions, an improved model predictive torque control strategy based on duty cycle is proposed which can eff ectively reduce the fl ux and torque ripples and improve steadystate control performance. This method combines the separate process of the voltage vector selection and the duty cycle calculation through the predictive model combined with duty cycle. Then, the optimal voltage vector and its duration is selected simultaneously based on minimizing the cost function. In addition, in order to mitigates the computational burden of the proposed method, the voltage vectors in the fi nite control set is pre-selected using hysteresis comparator according to the motor operating status. Furthermore, the duty cycle pulse width modulation is introduced to obtain a fi xed switching frequency of the inverter. The results of simulation experiments confi rm that the proposed strategy can signifi cantly reduce the fl ux and torque ripples and improve the steady state performance while maintaining fast dynamic response.

Parameters On-line Identification of Dual Three Phase Induction Motor by Voltage Vector Injection in Harmonic Subspace

Sheng, Shuang,Lu, Haifeng,Qu, Wenlong,Guo, Ruijie,Yang, Jinlei Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.3

This paper introduces a novel method of on-line identifying the stator resistance and leakage inductance of dual three phase induction motor (DTPIM). According to the machine mathematical model, the stator resistance and leakage inductance can be estimated using the voltage and current values in harmonic subspace. Thus a method of voltage vector injection in harmonic subspace (VVIHS) is proposed, which causes currents in harmonic space. Then the errors between command and actual harmonic currents are utilized to regulate the machine parameters, including stator resistance and leakage inductance. The principle is presented and analyzed in detail. Experimental results prove the feasibility and validity of proposed method.

Fuzzy-PID controller for motion control of CFETR multi-functional maintenance platform

Li, Dongyi,Lu, Kun,Cheng, Yong,Zhao, Wenlong,Yang, Songzhu,Zhang, Yu,Li, Junwei,Wu, Huapeng Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7

The motion control of the divertor maintenance system of the China Fusion Engineering Test Reactor (CFETR) was studied in this paper, in which CFETR Multi-Functional Maintenance Platform (MFMP) was simplified as a parallel robot for the convenience of theoretical analysis. In order to design the motion controller of parallel robot, the kinematics analysis of parallel robot was carried out. After that, the dynamic modeling of the hydraulic system was built. As the large variation of heavy payload on MFMP and highly nonlinearity of the system, A Fuzzy-PID controller was built for self-tuning PID controller parameters by using Fuzzy system to achieve better performance. In order to test the feasibility of the Fuzzy-PID controller, the simulation model of the system was built in Simulink. The results have showed that Fuzzy-PID controller can significantly reduce the angular error of the moving platform and provide the stable motion for transferring the divertor.

Dynamic analysis of multi-functional maintenance platform based on Newton-Euler method and improved virtual work principle

Li, Dongyi,Lu, Kun,Cheng, Yong,Zhao, Wenlong,Yang, Songzhu,Zhang, Yu,Li, Junwei,Shi, Shanshuang Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.11

The structure design of divertor Multi-Functional Maintenance Platform (MFMP) actuated by hydraulic system for China Fusion Engineering Test Reactor (CFETR) was introduced in this paper. The model of MFMP was established according to maintenance requirements. In this paper, Newton-Euler method and the improved virtual work principle were used, the equivalent driving force of each actuator was obtained through the equivalent Jacobian inverse matrix derived from velocity relationship among the components. The accuracy of the model was verified by ADAMS simulation. The stability control of the heavy-duty components driven by hydraulic cylinders based on Newton-Euler method and improved virtual work principle was established.

Eccentrically compressive behaviour of RC square short columns reinforced with a new composite method

Fan Zhang,Yi-Yan Lu,Shan Li,Wenlong Zhang 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.1

A new composite reinforced method, namely self-compacting concrete filled circular CFRP-steel jacketing, was proposed in this paper. Experimental tests on eight RC square short columns reinforced with the new composite reinforced method and four RC square short columns reinforced with CFS jackets were conducted to investigate their eccentrically compressive behaviour. Nine reinforced columns were subjected to eccentrically compressive loading, while three reinforced columns were subjected to axial compressive loading as reference. The parameters investigated herein were the eccentricity of the compressive loading and the layer of CFRP. Subsequently, the failure mode, ultimate load, deformation and strain of these reinforced columns were discussed. Their failure modes included the excessive bending deformation, serious buckling of steel jackets, crush of concrete and fracture of CFRP. Moreover, these reinforced columns exhibited a ductile failure globally. Both the eccentricity of the compressive loading and the layer of CFRP had a significant effect on the eccentrically compressive behaviour of reinforced columns. Finally, formulae for the evaluation of the ultimate load of reinforced columns were proposed. The theoretical formulae based on the ultimate equilibrium theory provided an effective, acceptable and safe method for designers to calculate the ultimate load of reinforced columns under eccentrically compressive loading.

Statistical tolerance–cost–service life optimization of blade bearing of controllable pitch propeller considering the marine environment conditions through meta-heuristic algorithm

Zeng Wenhui,Yi Jin,Lin Rongfu,Lu Wenlong 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.2

Blade bearing is the key mechanism of the controllable pitch propellers (CPPs) to adjust the pitch to change the thrust. In the marine environment, wear and deformation of the contact surface of the blade bearing are quite large, which may result in leakage to reduce the service life of CPP. However, most studies on tolerance optimization of blade bearing disregard deformations and wear, and it could result in unreasonable tolerances and impair the CPP’s service life. In this paper, to establish the statistical tolerance–cost–service life optimization model of the blade bearing of the CPP considering the marine environment effects in propellers, a prediction model about the relationship between the thrust and rotation speed of the CPP considering environment conditions of wind, wave, and ocean currents is constructed. Based on this, the wear and deformation are simulated according to the predicted rotation speed in the marine environment. Considering the deformation and wear in the marine environment, a tolerance analysis model of the assembly deviations of the blade bearing is introduced, and the assembly characteristics and functional requirements are established and converted into probability constraints to establish the service-life model based on statistical tolerance analysis and Monte Carlo simulation methods. Afterward, a statistical tolerance–cost–service life optimization model is established and transformed into a single-objective optimization problem through the normalization method and the weighted sum method, and solved by a meta-heuristic algorithm named cuckoo search. Finally, the application of the proposed model is demonstrated through a case involving the blade bearing of a CPP, and the optimized results show that the manufacturing cost of the blade bearing is reduced and its service life is extended.