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Medicine, Food or Commodity: The Significance of Chinese Lycium Barbarum in Daily Life
Wang Zihao1 Ma Jianfu 아시아사회과학학회 2021 Jornal of Asia Social Science Vol.3 No.3
Lycium barbarum has been eaten by people for more than 4, 000 years in Chinese history, according to medical classics and biographical records that can be verified. In this long development process, people’s understanding of Lycium barbarum has experienced three changes. That is, the changing process from medicine to food to commodity. The purpose of this paper is to study the changes of Lycium barbarum. From the perspective of Lycium barbarum, by presenting the significance of Lycium barbarum in people’s daily life in Ningxia, we can understand how Lycium barbarum is used as a link to influence people’s communication in Ningxia, and how Lycium barbarum spreads and communicates with the outside world through its commodity attributes.
IKPCA-ELM-based Intrusion Detection Method
( Hui Wang ),( Chengjie Wang ),( Zihao Shen ),( Dengwei Lin ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.7
An IKPCA-ELM-based intrusion detection method is developed to address the problem of the low accuracy and slow speed of intrusion detection caused by redundancies and high dimensions of data in the network. First, in order to reduce the effects of uneven sample distribution and sample attribute differences on the extraction of KPCA features, the sample attribute mean and mean square error are introduced into the Gaussian radial basis function and polynomial kernel function respectively, and the two improved kernel functions are combined to construct a hybrid kernel function. Second, an improved particle swarm optimization (IPSO) algorithm is proposed to determine the optimal hybrid kernel function for improved kernel principal component analysis (IKPCA). Finally, IKPCA is conducted to complete feature extraction, and an extreme learning machine (ELM) is applied to classify common attack type detection. The experimental results demonstrate the effectiveness of the constructed hybrid kernel function. Compared with other intrusion detection methods, IKPCA-ELM not only ensures high accuracy rates, but also reduces the detection time and false alarm rate, especially reducing the false alarm rate of small sample attacks.
플라이애쉬 시멘트 페이스트의 수화열류 감속 단계 분석 및 모델링에 대한 실험적 연구
왕자호 ( Wang Zihao ),이한승 ( Lee Han-seung ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
This study investigated the effect of fly ash content on the isothermal hydration heat of cement pastes. Two different pastes with fly ash content were studied to cure at 35°C. The hydration heat flow deceleration stage of slurry was simulated and compared by Jander Equation and Ginstling-Brounshtein Equation. The results show that Jander Equation and Ginstling-Brounshtein Equation have certain defects in the modeling of the deceleration stage of the heat flow of cement fly ash paste, and the fitted curve can not describe the deceleration stage well.
왕자호 ( Wang¸ Zihao ),이한승 ( Lee¸ Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
In this study, the effects of thermal activation on the compressive strength and water absorption of fly ash-cement systems were studied. The results show that the increase in curing temperature improves the early-age compressive strength and reduces its water absorption.
황산염나트륨 자극제를 사용한 플라이 애쉬 혼입 시멘트 페이스트의 초기 수화 특성에 관한 기초적 연구
왕자호 ( Wang Zihao ),순양 ( Sun Yang ),이한승 ( Lee Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
In order to solve the problem of low early-age compressive strength of high volume fly ash concrete. This paper studies the effect of 2% sodium sulfate (Na₂SO₄) as a chemical activator on the paste with 40% fly ash content and a water-binder ratio of 0.30. The results indicate that the addition of Na₂SO₄ can effectively improve the early-age compressive strength of the fly ash-cement system, and the strength improvement rate on the first day reached nearly 70%. In addition, calorimetric analysis reveals that the incorporation of Na₂SO₄ promotes the early hydration of cement and fly ash, increases the cumulative hydration heat and delays the heat peak of the aluminum phase.
Bo Gao,Da Chen,Bingli Gu,Ting Wang,Zihao Wang,Feng xie,Yongsheng Yang,Qinglei Guo,Gang Wang 한국물리학회 2020 Current Applied Physics Vol.20 No.4
Nitrogen-doped graphene quantum dots (N-GQDs) with high blue fluorescence efficiency were synthesized by the hydrothermal method from p-Phenylenediamine and p-Coumaric acid. The N-GQDs possess several superiorities, most significantly in excellent solubility and superior photostability. Besides, the as-prepared N-GQDs exhibit a uniform size distribution with a diameter of about 3.8 ± 0.5 nm. After dispersing the N-GQDs in water, the formed aqueous solution still presents a stable and homogeneous phase even after 2 months at room temperature. The N-GQD dispersion was further utilized as sensing probes for the selective detection of copper ions (Cu2+), which is realized by the photoluminescence (PL) quenching of N-GQDs after adding Cu2+. The detection limit for Cu2+ was found to be 57 nM L−1, with superior selectivity in the presence of other commonly interfering metal ions. The presented results in this study provide a facile and high-efficiency method for synthesizing N-GQDs, with ultra-high detectivity and selectivity for Cu2+ detection, offering numerous opportunities for the development of biosensing, bioimaging, environment monitoring, and others.
( Zihao Sun ),( Liangqing Wang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The structural characteristics of the sliding bed rock mass, such as occurrence and thickness, could significantly influence the effectiveness of anti-slide piles. Aimed at the problem that the structural characteristics of the sliding bed rock mass are rarely studied and just remain at the single factor sensitivity analysis level, thus a pile top displacement nonlinear prediction method considering multiple factors of the sliding bedrock mass structural characteristics was proposed. Firstly, influencing rules of structural characteristics of the sliding bed rock mass on anti-slide pile top displacement were quantitatively analyzed through 3DEC numerical test. Secondly, in order to study the comprehensive effects of rock mass structure characteristic on pile top displacement, a database consisting of varied rock mass structure characteristics and corresponding pile top displacements was established by orthogonal test and 3DEC numerical test. Based on this database, a nonlinear prediction model for pile top displacement was established by PSO-SVR method. Finally, the prediction model was verified by in-site measured data from Majiagou landslide, the results showed the high accuracy with a relative error of 5.6% for pile top displacement predicted by the established model. This work provides reference for similar engineering practice and is worthy of promotion.
ZhiKai Wang,ZhuMu Fu,ZiHao Wu,ChenQi Zhu,JiaCheng Li 한국항공우주학회 2024 International Journal of Aeronautical and Space Sc Vol.25 No.2
This paper presents a novel three-dimensional time-space cooperative guidance law against maneuvering target despite the presence of time-varying communication delays between missiles. The guidance law is divided into two parts. In the first part, a consensus protocol is designed for a multi-agent system consisting of a virtual leader and multiple followers. The objective is to tackle the problem of consensus convergence among the agents with communication delays. Additionally, the relationship between the upper bound of delays and the controller parameters is established. Based on the consensus protocol and a prescribed-time slide mode control method, the guidance law in the line-of-sight (LOS) direction is designed to ensure that the missiles attack the target simultaneously. In the second part, the multi-missile surrounding attack is achieved by designing different desired LOS azimuth and elevation angles for each missile. A guidance law in the normal LOS direction is designed based on the prescribed-time slide mode control method to ensure that the LOS angle converges to the desired values. To estimate the disturbances caused by the unknown and unpredictable acceleration of the maneuvering target in the LOS and normal LOS directions, fixed-time disturbance observers are designed. The stability analysis of the cooperative guidance law is provided in the appendix section. To demonstrate the effectiveness and superiority of the proposed cooperative guidance law, comparative simulations are performed.
Creep Properties of a Nickel-Based Single Crystal Superalloy with Low Density
Yuling Du,Zihao Tan,Yanhong Yang,Xinguang Wang,Yizhou Zhou,Jingguo Li,Xiaofeng Sun 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
A novel nickel-based single crystal superalloy with low density had been designed and the creep deformation mechanismsof the experiment alloy under two conditions (1050 °C/200 MPa and 1100 °C/137 MPa) had been systematically discussed. The topological inversion had been observed after fracture under the above two conditions. The effects of temperature andstress on creep life of the experiment alloy had been found no significant difference under the two conditions. It was indicatedthat the small decrease in temperature exerted limited influence on the creep behaviors of single crystal superalloys in therange of high temperature.
Youngho Eun,Zhicheng Xie,Zihao Wang,Xiaofeng Wu 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
This study presents the early-stage development status of the novel magnetorquer focusing on its operational capabilities to be applied in space applications. The aim is to show that the new magnetorquer can provide enough torque to a nano-scale satellite to perform a reorientation maneuver which is generally considered beyond the capacity due to its physical limitations. As the actuation process of the new magnetorquer differs from the conventional eletromagnet-based torquers, we designed the control input to have strictly three states only to detour the complexity behind the magnetization process which is subject to magnetic hysteresis. As the objective of this work is to prepare for the follow-on hardware experiment for demonstration, a software-based simulation environment is constructed to reflect the actual circumstances based on our previous measurements and new setups. The simulation result illustrates that such a pointing maneuver is achievable by employing the new magnetorquer with a relatively small amount of control effort while keeping the tracking performance within a predefined boundary.