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Polygonumnolides A1–B3, minor dianthrone derivatives from the roots of Polygonum multiflorum Thunb
Jianbo Yang,Zheng Yan,Jin Ren,Zhong Dai,Shuangcheng Ma,Aiguo Wang,Yalun Su 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.6
Seven new dianthrone glycosides, named polygonumnolidesA1–B3 (1–7), were isolated from the 70 %EtOH extract of the dried roots of Polygonum multiflorumThunb. using column chromatography and preparativehigh-performance liquid chromatography. Their structureswere determined by 1D and 2D NMR and mass spectroscopy. The isolated compounds were evaluated for theircytotoxic effects against KB tumor cell lines and compounds1–4 showed moderate cytotoxicity.
Microstructure and Tensile Properties of a Cast Eutectic Al–Si–Cu Alloy Modified by Zr and V
Jianbo Sun,Guangkai Zeng,Dewang Rao,Yuchen Wang,Yiwang Yang,Liwen Pan,Zhiliu Hu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Minor Zr and V were added individually and jointly to Al–12.5Si–1Cu alloy to develop heat-resistant aluminum alloys. Theas-cast microstructure, room temperature, and high temperature (350 °C) tensile properties and the strengthening mechanismof the modified alloys were investigated. The results show that the rod-like (Al, Si)3Zr and hexagonal (Si, Al)2V precipitatesare respectively found in the alloys with individually added Zr or V. At the same time, they were transformed into (Al,Si)3(Zr, V) and (Si, Al)2(V, Zr) when Zr and V were added together. Individually added Zr or V could change the eutecticsilicon aspect ratio, but the largest effect was recorded for the combined addition 0.3 wt% Zr + 0.4 wt% V. The addition ofZr and V had no significant impact on the room temperature tensile strength of the alloys but improved the yield strength. Individual additions of Zr and V caused negligible improvements in high-temperature tensile strength of alloys tested. Incontrast, the combined Zr + V additions resulted in the substantial improvement with tensile strength at 350 °C reaching79.4 MPa, i.e. 89% higher than the base alloy. The analysis shows that the increase of eutectic silicon aspect ratio and thesolution strengthening of trace V in eutectic silicon is the leading cause of improving high-temperature tensile strength. Thebrittle, blocky primary silicon, coarse rod-like (Al, Si)3(Zr, V), and hexagonal (Si, Al)2(V, Zr) precipitates are detrimentalto high-temperature properties.
Jianbo Feng,Liyang He,Yanxue Wang,Jianwei Yang,Hongbin Ren 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
The vehicle platoon is subject to dynamic uncertainty and external disturbance, such as air drag and parameter variation in practice, so lack of consideration for those factors can deteriorate control performance. This paper proposes a nonlinear control algorithm based on a novel adaptive backstepping method to cope with the uncertainty and disturbance. The virtual controller in the backstepping method utilizes only the local information of the individual vehicle, rather than the global state information, in the control algorithm design. A third-order vehicle dynamics model was built to incorporate the nonlinearity and the factor of actuation delay. The fuzzy logic system (FLS) is applied to estimate the nonlinearity in vehicle dynamics to facilitate the adaptive control. Five scenarios with different settings were constructed to verify the control performance in the simulation, which indicates the effectiveness and robustness of the controller to dynamic uncertainty and external disturbance.
Lin Yue,Jianbo Guo,Jingliang Yang,Jing Lian,Xiao Luo,Xiangning Wang,Kaihong Wang,Li Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
The electrochemical oxidation of dye wastewater with the cathode modified by quinones has beeninvestigated. Under the optimal conditions, the decolorization efficiency can reach 96.0% after 120 min. The addition of tert-butanol significantly decreased the decolorization efficiency, suggesting theinvolvement of -OH radicals in the decomposition of H2O2. A potential difference may result in a quinoneradical on the cathode which can catalyze the reduction of O2 to H2O2. UV–vis spectrum and GC/MSanalysis revealed that the dye molecule was firstly initiated by the cleavage of –N55N–, and decomposedto aromatic intermediates, further degraded to ring opening products and finally mineralized.
Research on Fitness Function of Two Evolution Algorithms Used for Neutron Spectrum Unfolding
Li Rui,Yang Jianbo,Tuo Xianguo,Shi Rui 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.2
When evolution algorithms are used to unfold the neutron energy spectrum, fitness function design is an important fundamental work for evaluating the quality of the solution, but it has not attracted much attention. In this work, we investigated the performance of eight fitness functions attached to the genetic algorithm (GA) and the differential evolution algorithm (DEA) used for unfolding four neutron spectra selected from the IAEA 403 report. Experiments show that the fitness functions with a maximum in the GA can limit the ability of the population to percept the fitness change, but the ability can be made up in the DEA. The fitness function with a feature penalty term helps to improve the performance of solutions, and the fitness function using the standard deviation and the Chi-squared result shows the balance between the algorithm and the spectra. The results also show that the DEA has good potential for neutron energy spectrum unfolding. The purposes of this work are to provide evidence for structuring and modifying the fitness functions and to suggest some genetic operations that should receive attention when using the fitness function to unfold neutron spectra.
Enhanced electrochemical oxidation of dye wastewater with Fe2O3 supported catalyst
Lin Yue,Jianbo Guo,Kaihong Wang,Jingliang Yang,Xiao Luo,Jing Lian,Li Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Electrochemical oxidation of Acid Red 3R was investigated in the presence of Fe2O3/γ-Al2O3 as Fenton-like catalyst in the reactor. The results showed that the catalyst had catalytic activity in theelectrochemical process. Under the optimal conditions, the decolorization efficiency reached 77.2% in100 min. UV–vis spectrum and LC–MS analysis revealed that the dye molecule was firstly decomposed toaromatic intermediates, further degraded to ring opening products and finally mineralized. The azo dyedegradation might be attributed to strong oxidant -OH that produced from the synergetic effect ofbetween Fe2O3/γ-Al2O3 catalyst and electrochemical system.
A General Encryption Algorithm for Different Format Videos
Hao Li,Cheng Yang,Jiayin Tian,Jianbo Liu 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.10
With the rapid development of social network, more and more information is being presented in the form of multimedia, so the security of multimedia files, especially video files, has been capturing the attention of the researchers. Video encryption is widely applied to the DRM system, video conference, medical and military fields and so on. A general video encryption algorithm is proposed to solve the problem that the existing multiple formats (compression formats and container formats) of video requires a unified encryption scheme. Meanwhile, the proposed scheme can not only provide variable levels of security, but also have good performance of compression efficiency and computational complexity, which can ensure that the encrypted video data can be operation.
Jingsong He,Ni Xie,Jianbo Yang,Hong Guan,Weicai Chen,Huisheng Wu,Zishan Yuan,Kun Wang,Guojin Li,Jie Sun,Limin Yu 한국유방암학회 2014 Journal of breast cancer Vol.17 No.3
Purpose: Synuclein-γ (SNCG), which was initially identified asbreast cancer specific gene 1, is highly expressed in advancedbreast cancers, but not in normal or benign breast tissue. Thisstudy aimed to evaluate the effects of SNCG siRNA-treatmenton breast cancer cells and elucidate the associated mechanisms. Methods: Vectors containing SNCG and negative control(NC) siRNAs were transfected into MDA-MB-231 cells; mRNAlevels were determined by real-time polymerase chain reaction. Cell proliferation was evaluated using the MTT assay, cell migrationwas assessed by the Transwell assay, apoptosis and cellcycle analyses were conducted with the flow cytometer, andWestern blot analysis was performed to determine the relativelevels of AKT, ERK, p-AKT, and p-ERK expression. Results:SNCG mRNA levels were significantly reduced in MDA-MB-231cells transfected with SNCG siRNA. Our results indicate that inSNCG siRNA-treated cells, cell migration and proliferation decreasedsignificantly, apoptosis was induced, and the cell cyclewas arrested. Western blot analysis indicated that the proteinlevels of p-AKT and p-ERK were much lower in the SNCG siRNA-treated groups, than in the control and NC groups. Conclusion:SNCG siRNA could decrease the migration and proliferationof breast cancer cells by downregulating the phosphorylationof AKT and ERK.
Lightweight Key Distribution Protocol for Streaming Media DRM
Hao Li,Tang Xuyue,Jiayin Tian,Jianbo Liu,Cheng Yang 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.9
In the daily-real systems, protecting the data only is far less enough. The process about the generation, distribution, storage, and the revocation of the key is the core problem in the system-security consideration. If the management of the key is insecure, attackers could easily get the key used in the encryption steps to the context, leading to useless processing in the encryption no matter how secure the system be. Unlike the period of validity for the different key, the key can easily be attacked by various methods due to its distribution through the complex net links, which would bring about the threatening of the security. In this paper, we analyze three models of the key distribution, associated with the actual applications for the encryption in the hypermedia video stream. Besides, we raise up a new protocol based on the IKEV2 distribution protocol and evaluate the stability when it suffer the Man-in –the-Middle Attacks, DoS and Replay attacks.