Design and Development of Large Electric Curtain Control System for Time Controlled

Shuo Cheng(정석),Yong Taek Chung(정용택),Xiang Fan Piao(박상범) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.3

The purpose of this paper is to design a curtain control system for centralized management of large curtains, which includes curtain structure, electric curtain controller, communication system, user interface and remote control. Curtain structure is designed to avoid using limit switch. The system is based on microprocessor, determined the stop position and complete running time of electric curtain through time control, and achieved remote control of curtain opening and closing through wired and wireless communication modes. By establishment of a mathematical model to calculate the inertia compensation time of the electric curtain, the electric curtain can be stopped ahead of time, and the curtain can be completely closed by the inertia. The result of test experiment of 32 electric curtain controllers shows the communication success rate reached 100%.

Design of Dissolution Apparatus for the Flow-through Cell Method Based on the Low Pulsation Peristaltic Pump

Jun Cheng Zhao(조준성),Shuo Cheng(정석),Xiang Fan Piao(박상범) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.1

The emergence of the flow-through cell (FTC) method has made up for the limitations of previous dissolution test methods, but the high cost of the FTC dissolution devices have seriously hindered the progression of research and application of the FTC. This new design uses a peristaltic pump to simulate the sinusoidal flow rate of a piston pump. The flow profile of each peristaltic pump was sinusoidal with a pulsation of 120 ± 1 pulses per minute, and the flow rate ranged from 1.0 - 36.0 mL/min. The flow control of each channel was adjusted independently so the flow errors of the seven channels were close to 2%. The structure of the system was simplified, and the cost was reduced through manual sampling and immersing the FTC in a water bath. The dissolution rate of the theophylline and aminophylline films was determined, and good experimental results were obtained.

Aeroengine performance degradation prediction method considering operating conditions

Bang-Cheng Zhang,Shuo Gao,Zhong Zheng,Guanyu Hu 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.9

It is significant to predict the performance degradation of complex electromechanical systems. Among the existing performance degradation prediction models, belief rule base (BRB) is a model that deal with quantitative data and qualitative information with uncertainty. However, when analyzing dynamic systems where observable indicators change frequently over time and working conditions, the traditional belief rule base (BRB) can not adapt to frequent changes in working conditions, such as the prediction of aeroengine performance degradation considering working condition. For the sake of settling this problem, this paper puts forward a new hidden belief rule base (HBRB) prediction method, in which the performance of aeroengines is regarded as hidden behavior, and operating conditions are used as observable indicators of the HBRB model to describe the hidden behavior to solve the problem of performance degradation prediction under different times and operating conditions. The performance degradation prediction case study of turbofan aeroengine simulation experiments proves the advantages of HBRB model, and the results testify the effectiveness and practicability of this method. Furthermore, it is compared with other advanced forecasting methods. The results testify this model can generate better predictions in aspects of accuracy and interpretability.

An experimental study on pool sloshing behavior with solid particles

Songbai Cheng,Shuo Li,Kejia Li,Ting Zhang 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1

It is important to clarify the mechanisms of molten-fuel-pool sloshing behavior that might be encounteredduring a core disruptive accident of sodium-cooled fast reactors. In this study, motivated byacquiring some evidence for understanding the characteristics of this behavior at more realistic conditions,a number of experiments are newly performed by injecting nitrogen gas into a water pool with theaccumulation of solid particles. To achieve comprehensive understanding, various parameters includingparticle bed height, particle size, density, shape, gas pressure along with the gas-injection duration, wereemployed. It is found that due to the different interaction mechanisms between solid particles and thegas bubble injected, three kinds of regimes, termed respectively as the bubble-impulsion dominantregime, the transitional regime and the bed-inertia dominant regime, could be identified. The performedanalyses also suggest that under present conditions, all our experimental parameters employed can havenoticeable impact on the regime transition and resultant sloshing intensity (e.g. maximum elevation ofwater level at pool peripheries). Knowledge and fundamental data from this work will be used for thefuture verifications of fast reactor severe accident codes in China

Research on Quick-freezing Device with Ultralow Temperature Water Medium under Negative Pressure and Quick-freezing Method

Li Shuo,Wang Shucai,Cheng Fang,Xia Gaobing 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.8

This paper puts forward a quick-freezing method by putting the ultralow temperature medium into a negative pressure. Through the experiment, it indicated the speed and quality to refrigerating water under the condition of negative pressure. Based on that, it designed a quick-freezing device. Meanwhile this paper researched on how to quick-freeze products in bags by adopting this device. After being testified by the experiment, it proved that this device had improved the quick-freezing efficiency and the refrigerating effect.

Bi-functional Al-doped ZnO@SnO2 heteronanowires as efficient substrates for improving photocatalytic and SERS performance

Yu-Cheng Chang,Shuo-Hsiu Wu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-

Bi-functional Al-doped ZnO@SnO2 heteronanowires systematically analyzed as high-performancesubstrates for photocatalytic and surface-enhanced Raman scattering (SERS) applications. For thephotocatalytic application, the Al-doped ZnO@SnO2 heteronanowires can exhibit highly efficient andreusable photocatalysts in the photodecomposition of rhodamine 6G solution under low-powered UVlightirradiation, which ascribed to improve the inhabitation of electron–hole pairs recombination andhigher surface active sites. For the SERS application, Al-doped ZnO@SnO2 heteronanowires revealedsuitable geometry to deposit Ag nanoparticles with higher density and more hot spots in threedimensionalstructures, which can provide high SERS enhancement, low detection limit (amoxicillin10 10 M), high reproducibility, and stability.

V-life의 시각적 인지 반응이 팬 행동 의도에 미치는 영향에 관한 연구

Yin Shuo Han,Wang Jin Nan,Wang Cheng Hao 사단법인 한국융합기술연구학회 2023 아시아태평양융합연구교류논문지 Vol.9 No.4

This study focuses on the influence of V-life's visual cognitive response on fans' behavioral intention. Recently, a variety show called 2060, featuring an original virtual idol, caused a heated debate in China. The show gave these digital human the concept of " V-life(virtual life)". According to the results of the market survey, fans pay as much as 72.8% attention to the visual design of digital human. It can be inferred that the visual cognitive response of V-life will play an important role in the behavioral intention of fans. This study verified this influence path through a questionnaire survey and structural equation model analysis. The results show that, in the visual cognitive response of V-life, discomfort has a significant negative impact on verisimilitude and physical attractiveness. Following this, verisimilitude will have a positive impact on authenticity through social presence, while authenticity through social attractiveness will be positively influenced through physical attractiveness. Lastly, the authenticity of V-life will have a positive impact on the relationship maintenance intention, and will further have a positive impact on the product purchase intention through the relationship maintenance intention. Future research will continue to expand the findings to more fan groups and media types. 본 연구는 V-life의 시각적 인지 반응이 팬 행동 의도에 미치는 영향에 관한 연구이다. 본 연구는 주로 V-life의 시각적 인지 반응이 팬들의 행동 의도에 미치는 영향에 대해 탐구하고 있다. 이를 위해 최근 디지털 휴먼에게 V-life(가상 아이돌)라는 개념을 부여하는 데 지대한 역할을 한 '2060'이라는 예능 프로그램을 예시로써 소개하고 있다. 해당 프로그램은 예능에서 오리지널 디지털 휴먼을 처음 등장시켜 중국에서 뜨거운 논쟁과 신선한 바람을 가져왔다. 시장조사에 따르면 팬들의 관심 중 72.8%가 가상 아이돌의 외형 디자인에 집중되어 있음을 알 수 있다. 그렇기에 가상 아이돌인 V-life에 대한 시각적 인지 반응이 팬들의 행동 의도에 유의미한 영향을 미칠 것으로 가정할 수 있다. 본 연구는 설문조사 및 구조 방정식 모델의 분석 결과를 통해 해당 가설의 영향 경로를 확인했다. 연구 결과에 따르면 V-life의 시각적 인지 반응의 불편함(부조화)은 사실감과 신체적 매력에 부정적인 영향을 미치는 것을 알 수 있었으며 사실감은 사회적 실재감을 통해, 신체적 매력은 사회적 매력을 통해 진정성에 긍정적인 영향을 미치는 것으로 나타났다. 마지막으로 V-life의 진정성은 관계 유지 의도를 통해 제품 구매 의도에 더욱 긍정적인 영향을 미칠 수 있을 것으로 추정된다. 해당 연구 결과는 더 많은 팬 그룹 및 미디어 유형에 관한 후속 연구로 확대될 것으로 기대된다.

Biomechanical Evaluation of 2 Endoscopic Spine Surgery Methods for Treating Lumbar Disc Herniation: A Finite Element Study

Yang Zou,Shuo Ji,Hui Wen Yang,Tao Ma,Yue Kun Fang,Zhi Cheng Wang,Miao Miao Liu,Ping Hui Zhou,Zheng Qi Bao,Chang Chun Zhang,Yu Chen Ye 대한척추신경외과학회 2024 Neurospine Vol.21 No.1

Objective: This study aimed to evaluate the effects of 2 endoscopic spine surgeries on the biomechanical properties of normal and osteoporotic spines. Methods: Based on computed tomography images of a healthy adult volunteer, 6 finite element models were created. After validating the normal intact model, a concentrated force of 400 N and a moment of 7.5 Nm were exerted on the upper surface of L3 to simulate 6 physiological activities of the spine. Five types of indices were used to assess the biomechanical properties of the 6 models, range of motion (ROM), maximum displacement value, intervertebral disc stress, maximum stress value, and articular protrusion stress, and by combining them with finite element stress cloud. Results: In normal and osteoporotic spines, there was no meaningful change in ROM or disc stress in the 2 surgical models for the 6 motion states. Model N1 (osteoporotic percutaneous transforaminal endoscopic discectomy model) showed a decrease in maximum displacement value of 20.28% in right lateral bending. Model M2 (unilateral biportal endoscopic model) increased maximum displacement values of 16.88% and 17.82% during left and right lateral bending, respectively. The maximum stress value of L4–5 increased by 11.72% for model M2 during left rotation. In addition, using the same surgical approach, ROM, maximum displacement values, disc stress, and maximum stress values were more significant in the osteoporotic model than in the normal model. Conclusion: In both normal and osteoporotic spines, both surgical approaches were less disruptive to the physiologic structure of the spine. Furthermore, using the same endoscopic spine surgery, normal spine biomechanical properties are superior to osteoporotic spines.

Predicting connection integrity with consideration of thermo stress

Yong Qin Cheng,Shuo Qiong Liu,Feng Zhong Qi,Hui Ting Liu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8

In the conventional gas seal analysis of special threaded joints, the influence of temperature stress caused by the difference between formation temperature and fluid temperature in casing is often neglected. However, the influence mechanism of temperature stress is prerequisite information for accurately predicting the safe operating conditions that prevent a premium connection from being damaged. In this paper, we propose a model that includes these effects to predict the safe operating pressures and temperatures that will prevent seal failure. For the temperature stress, we propose a finite element model of thermal solid coupling. Subsequent stress changes are evaluated by a fully coupled model of thermal solid coupling to analyze the mechanical behavior of the premium connection. We predict the safe operating envelope (SOE) for premium connection failures caused by pressure and temperature perturbations after make-up. Our model predicts that radial pressure is a key factor for connection failure, especially for rapid temperature changes. If the formation temperature is high and the casing fluid temperature is low, the influence of temperature stress will increase under this working condition, resulting in an increase in the probability of failure of premium connections. Compared with conventional premium connection models, the model of thermal solid coupling predicts a smaller SOE when heating the internal casing fluid and a larger envelope when cooling the internal casing fluid. Finally, the heating rate was considered with respect to field applications. The heating rate was also considered, and slower heating/cooling rates can prevent damage to the seal integrity. Finally, the model was applied to explain several laboratory and field experiments and achieved good matches.

Application of Adaptive Control on Carbon Fiber Diagonal Loom

Wei Liu,Shuo Wang,Fengdong Shi,Guowei Xu,Yi Cheng 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.3

In order to improve the control effect of the tension fluctuation, a single neuron adaptive control strategy based on quadratic performance index is proposed in this paper. The structure and the working principle of carbon fiber diagonal loom are studied which can be used for dynamic analysis and controller design. With the idea of optimal control, the parameters of the controller are adjusted by minimizing the sum of the square of the output error and the control increment. The simulation results based on TrueTime show that the strategy adopted in this paper compared with the traditional control strategy have the advantages of faster response time and smaller overshoot in networked control system.