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.

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 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.

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.

Fishbone Oscillations in the Experimental Advanced Superconductivity Tokamak

Liqing Xu,Liqun Hu,Yi Yuan,Yingying Li,Guo-Qiang Zhong,Hai-Qing Liu,Kaiyun Chen,Tong-Hui Shi,Yan-Min Duan 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.6

A fishbone oscillation was observed in the neutral beam injection plasma at Experimental Ad- vanced Superconductivity Tokamak (EAST). This m = 1/n = 1 (m, n: poloidal, toroidal mode numbers, respectively) typical internal kink mode travels in the ion-diamagnetism direction in the poloidal section with a rotation speed close to the ion diamagnetic drift frequency. A high thermal plasma beta and high amounts of energetic ions are necessary for the mode to develop. Fishbone oscillations can expel heavy impurities in the core, which favors sustaining a high-performance plasma. The born frequency of the fishbone oscillation is the ion diamagnetic drift frequency and the chirping down of the frequency during the initial growth phase is the result of a drop in ion- diamagnetic drift frequency. The excitation energy is thought to be due to the thermal plasma pressure gradient; however, the development of a fishbone oscillation is related to energetic ions. A fishbone oscillation was observed in the neutral beam injection plasma at Experimental Advanced Superconductivity Tokamak (EAST). This m = 1/n = 1 (m, n: poloidal, toroidal mode numbers, respectively) typical internal kink mode travels in the ion-diamagnetism direction in the poloidal section with a rotation speed close to the ion diamagnetic drift frequency. A high thermal plasma beta and high amounts of energetic ions are necessary for the mode to develop. Fishbone oscillations can expel heavy impurities in the core, which favors sustaining a high-performance plasma. The born frequency of the fishbone oscillation is the ion diamagnetic drift frequency and the chirping down of the frequency during the initial growth phase is the result of a drop in ion- diamagnetic drift frequency. The excitation energy is thought to be due to the thermal plasma pressure gradient; however, the development of a fishbone oscillation is related to energetic ions.

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.

Long-lived Impurity-ion Snakes in the EAST ELM-free H-mode Sawtoothing Plasma

Tianpeng Ma,Liqing Xu,Liqun Hu 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.11

Two types of long-lived impurity-ion snakes (LLSs) including the ideal-like kink mode which damps before the large sawtooth crash, termed sawtooth-free LLSs (SF-LLSs) and complex LLSs (C-LLSs), which coexist with compound sawtooth and final damping after sawtooth crash were observed in EAST ELM-free H-mode sawtoothing plasma. These LLSs have an m = 1 structure, accompanied by several harmonic modes (m = 2, m = 3 . . .). There is a slight frequency-chirping behavior of the LLS. Similar with the typical sawtooth crash phase, a large crescent-shaped helical island-like structure in the core region of the C-LLSs was visible after the major crash of the coexisting compound sawtooth. The strong coupling of the C-LLSs and the 2/1 tearing mode (TM) can trigger a neo-classical tearing mode (NTM) due to a forced magnetic reconnection.

Transient Snakes in an Ohmic Plasma Associated with a Minor Disruption in the HT-7 Tokamak

Songtao Mao,Liqing Xu,Liqun Hu,Kaiyun Chen 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.9

A transient burst (2 ms, an order of the fast-particle slowdown timescale) of a spontaneous snakeis observed for the first time in a HT-7 heavy impurity ohmic plasma. The features of the low-Zimpurity snake are presented. The flatten electron profile due to the heavy impurity reveals theformation of a large magnetic island. The foot of the impurity accumulation is consistent with thelocation of the transient snake. The strong frequency-chirping behaviors and the spatial structuresof the snake are also presented.

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.

Design of Distance Measuring System Based on MEMS Accelerometer

Lei Xu,Liqing Fang,Chunsheng Lin,Deqing Guo,Ziyuan Qi,Ruikun Huo 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.4

In order to accurately measure the moving distance of the object and make the distance measurement more intelligent, a distance system is designed based on the Micro Electro-Mechanical System accelerometer. The modular design idea is used to design the three modules of the system, including acceleration measurement module, the acceleration storage module and the acceleration control module. The integrated packaging technology is used to realize the combination of the carrier and the distance system, so that the system can achieve acceleration real-time measurement, storage and other functions on the overload condition. The purpose of real-time calculation of the carrier’s moving distance is realized. And it can upload the stored data to the computer for further analysis and processing. The light gas gun test shows that the system has high anti-overload capability, and it can realize real-time measurement and calculation of motion acceleration. The precision of the distance measuring system can be up to 98.39%.