Deep Learning: High-quality Imaging through Multicore Fiber

Liqing Wu,Jun Zhao,Minghai Zhang,Yanzhu Zhang,Xiaoyan Wang,Ziyang Chen,Jixiong Pu 한국광학회 2020 Current Optics and Photonics Vol.4 No.4

Imaging through multicore fiber (MCF) is of great significance in the biomedical domain. Although several techniques have been developed to image an object from a signal passing through MCF, these methods are strongly dependent on the surroundings, such as vibration and the temperature fluctuation of the fiber’s environment. In this paper, we apply a new, strong technique called deep learning to reconstruct the phase image through a MCF in which each core is multimode. To evaluate the network, we employ the binary cross-entropy as the loss function of a convolutional neural network (CNN) with improved U-net structure. The high-quality reconstruction of input objects upon spatial light modulation (SLM) can be realized from the speckle patterns of intensity that contain the information about the objects. Moreover, we study the effect of MCF length on image recovery. It is shown that the shorter the fiber, the better the imaging quality. Based on our findings, MCF may have applications in fields such as endoscopic imaging and optical communication.

The Prevalence of Post-Traumatic Stress Disorder in the General Population during the COVID-19 Pandemic: A Systematic Review and Single-Arm Meta-Analysis

Liqing Zhang,Rong Pan,Yixian Cai,Jiyang Pan 대한신경정신의학회 2021 PSYCHIATRY INVESTIGATION Vol.18 No.5

Objective To investigate the prevalence of post-traumatic stress disorder (PTSD) in the general population during the COVID-19 pandemic by a systematic review and single-arm meta-analysis.Methods CNKI, PubMed, EMBASE, and MEDLINE were searched to collect literature on the prevalence of PTSD in the general population during the epidemic. The retrieval time is from the database construction to 31/08/2020. Meta-analysis was performed on the included articles by using Review Manger 5.3 and Stata 16.0 software.Results The prevalence of PTSD in the general population during the COVID-19 pandemic was 15% (95% CI: 11–21%, p<0.001).Conclusion The COVID-19 pandemic brought certain mental pain to general population, leading to a rise in the incidence of PTSD in a short time.

Adaptively Secure Anonymous Identity-based Broadcast Encryption for Data Access Control in Cloud Storage Service

( Liqing Chen ),( Jiguo Li ),( Yichen Zhang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.3

Cloud computing is now a widespread and economical option when data owners need to outsource or share their data. Designing secure and efficient data access control mechanism is one of the most challenging issues in cloud storage service. Anonymous broadcast encryption is a promising solution for its advantages in the respects of computation cost and communication overload. We bring forward an efficient anonymous identity-based broadcast encryption construction combined its application to the data access control mechanism in cloud storage service. The lengths for public parameters, user private key and ciphertext in the proposed scheme are all constant. Compared with the existing schemes, in terms of encrypting and decrypting computation cost, the construction of our scheme is more efficient. Furthermore, the proposed scheme is proved to achieve adaptive security against chosen-ciphertext attack adversaries in the standard model. Therefore, the proposed scheme is feasible for the system of data access control in cloud storage service.

The impact of accounting information quality and financing constraints on innovation input of Chinese private enterprises

Liqing Tang,Tongyun Zhang HONG KONG ACADEMY OF SOCIAL SCIENCES 2023 Journal of Social Science Development Research Vol.1 No.1

With the advancement of economic globalization and the gradual intensification of competition in international market, enterprises need to constantly enhance their comprehensive strength to consolidate market position and improve the internal innovation ability, which is also a new mission given to enterprises under the new era. At present, the innovation activities of Chinese enterprises are faced with many difficulties, such as long investment cycle time, too much investment capital, high risk, short-term income is not obvious, and so on. However, if enterprises use agents to promote enterprise innovation, the financing constraints caused by the current market agency costs and internal and external information asymmetry greatly hinder the process of independent innovation of private enterprises. Therefore, it is of great significance to study the influencing factors of private enterprises' input in indigenous innovation to improve their independent innovation ability and promote their further development.

Comparisons and Correlations of Phenolic Profiles and Anti-oxidant Activities of Seventeen Varieties of Pineapple

Liqing Du,Guangming Sun,Xiumei Zhang,Yuge Liu,Witoon Prinyawiwatkul,Zhimin Xu,Yixiao Shen 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.2

Major phenolic, β-carotene, and ascorbic acid (AA) contents in 17 pineapple varieties were quantified and compared. Anti-oxidant activities were evaluated using 2,2-Diphenyl-l-picrylhydrazyl (DPPH), 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS), ferric reducing anti-oxidant power (FRAP), and metal chelating capacity (MCC) assays. MD-2 exhibited the highest AA and total phenolic (TP) contents and DPPH and ABTS assay results, but was lower in β-carotene contents. Ripley had the highest total flavonoid (TF) content with a low AA content. Comte de Pairs exhibited the highest MCC and the lowest FRAP values. TP contents and both DPPH and ABTS activities, FRAP values and both AA contents and DPPH activities, and TF contents and ABTS activities were positively correlated. MD-2 exhibited the greatest diversity of phenolics and highest anti-oxidant activities in all assays. Information included herein can be useful for development of pineapple-based food products containing high levels of health promoting anti-oxidants.

The Anxiety Status of Chinese Medical Workers During the Epidemic of COVID-19: A Meta-Analysis

Pan Rong,Zhang Liqing,Pan Jiyang 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.5

Objective To analysis the anxiety status of Chinese medical workers during the epidemic of COVID-19 by meta-analysis method. Methods CNKI, VIP, WanFang Data, SinoMed, PubMed, Cochrane, EMBASE, MEDLINE, Scopus, Google Scholar and other databases were searched to collect literature on the anxiety status of Chinese medical workers during the epidemic of COVID-19. The retrieval time is from the database construction to 11/03/2020. Meta-analysis was performed on the included articles by using Stata 16.0 software. Results A total of 7 articles were included, with a total sample size of 7,741 people. Meta-analysis using the random effects model showed that the anxiety score of Chinese medical during the epidemic of COVID-19 was significantly higher than that of the national norm in each study, the difference was statistically significant [SMD (95% CI)=1.145 (0.705–1.584), p<0.001]. Conclusion The anxiety level of Chinese medical workers has increased significantly during the epidemic of COVID-19.

Seismic Response of Resilient Steel Frame with Self-Centering SMA Brace

Shujun Hu,Liqing Chang,Bo Zhang,Sizhi Zeng,Fenghua Tang,Qing Zhi 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.6

An innovative self-centering shape memory alloy (SMA) brace aiming at improving the seismic performance and self-centering capacity of steel frame structures is proposed in this paper. A series of cyclic loading tests with six self-centering SMA brace (SC-SMAB) specimens was carried out to investigate the effects of SMA area, bolt torque and initial SMA force on the hysteresis curves, energy dissipation and self-centering capacity. In addition, based on the experimental results, a numerical model of SC-SMAB with the improved Graesser and Bouc–Wen model was established and validated. Three different single-bay plan configurations of 9 storey steel frames including bare steel frame (BSF), steel frame with slip braces (SF-SB) and steel frame with SC-SMABs (SF-SCB) were analyzed to evaluate the seismic response. The test results show that the SC-SMAB with the bolt torque of 10 N M and initial SMA force of 5 kN has the maximum bearing force and self-centering capacity ratio. The established numerical model can accurately predict the seismic performance of the SC-SMAB. The inter-story drift ratio, roof displacement and roof acceleration of SF-SCB are lower than those of the BSF and SF-SB evidently, which decrease by 62.21%, 29.46% and 28.36% respectively from BSF. The hysteresis curve of SC-SMAB in the steel frame has nearly ideal flag-shape with high bearing force, good energy dissipation capacity, small residual deformation and outstanding re-centering capacity.

Experimental Study of the band-pass Filter and Slow-wave Effect in a MDM channel Based on a Magnetic Plasmonic Analogue of EIT

Wusong Wang,Liwei Zhang,Liqing Shang,Yewen Zhang 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.9

In connection with an analogue of electromagnetically-induced transparency (EIT), this paper studied experimentally the tunable band-pass filter and tunable slow-wave effect of MDM (μ-negative materials/double positive materials/μ-negative materials) magnetic plasmonic channel. The results of simulations and experiments show that an evident electromagnetically-induced transparency phenomenon appears in this channel with double-side resonators, which can be used to realize simultaneous the band-pass filter and the slow-wave effect. The band-pass filter’s center frequency is founded to be determined by the size of the side resonator, the resonator direction and the effective permeability of μ-negative (MNG) metamaterials. The bandwidth can be adjusted by detuning of the two resonator frequencies, the band size of the band-pass filter depends on the number of the resonators, Thus, the band-pass filter characteristics of the MDM waveguide can be tuned by changing the resonator parameters, the resonator direction and the effective permeability of the MNG materials. Moreover, the MDM structure can also be utilized to obtain a tunable slow-wave effect (such as an adjustable frequency, a slow-down factor, and even a muti-band slow wave) based on EIT. The experimental results are in good agreement with the simulation results.

Hierarchical porous composites derived from spent tire char for CO2 capture: K-N co-doped, process intensification and thermodynamic analysis

Hongguan Wang,Guofeng Qiu,Yanjie Niu,Liqing Chen,Yan Li,Sixi Guo,Yixin Zhang,Jianjun Wu,Fanhui Guo 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-

Spent tire is a kind of solid waste with large production, accumulation and great pollution. Spent tire charis the primary product of tire harmless disposal. Its commercial value is enhanced by modification. In thisstudy, K-N co-doped activated carbon was prepared by using spent tire char as raw material, KOH andmelamine as activator and dopant to enhance CO2 capture. In comparison with traditional process, thereasons for the decrease in specific surface area and pore volume caused by K doped have been identified,and a potential doped mechanism has been proposed. It was determined that pyridine nitrogen in theamino functional group played a key role in CO2 adsorption. Meanwhile, the synergistic intensificationof CO2 adsorption by potassium phenolic and pyridine nitrogen was verified by simplified model simulation. The precise K-N doping significantly intensify the CO2 adsorption capacity of spent tire char from0.45 to 2.60 mmol/g (1 bar, 0℃), an increase of 4.78 times. Thermodynamic studies have demonstratedthat the Langmuir model accurately describes the adsorption process, and the adsorption reaction takesplace spontaneously at temperatures below 80.52 C. This work presents an efficient process for upgradingspent tire char, and a novel method of co-treating waste and CO2.

Construction of Eukaryotic Vector Expressing shRNA of Lycopene Cyclase Gene carRA

( Ye Li ),( Lihua Jin ),( Qing Wei ),( Xiaojie Wang ),( Bo Li ),( Yuning Zhang ),( Liqing Zhang ) 조선대학교 공학기술연구원 2012 공학기술논문지 Vol.5 No.2

To construct eukaryotic vector expressing shRNA (short hairpin RNA) of carRA. Methods: Designing three different shRNA targeting the coding sequence of the car RA, the mU6-carRA shRNA was constructed by inserting the designed shRNA to the eukaryotic expression vector mU6pro. The constructed eukaryotic vector expressing shRNA of carRA was transformed into DH5 strain. Finally, the recombinant plasmid identified by restriction endonuclease was used for sequence analysis. Results: It was verified by partial nucleotide sequencing and restriction endonuclease digestion that the constructed eukaryotic vector expressing shRNA of carRA was correct. Conclusion: The results of study lay the foundation for further studying on its inhibitive effect on cycling of lycopene.