检索结果-南通市图书馆

Recent advances in imaging devices:image sensors and neuromorphic vision sensors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第11期43卷 5487-5515页

作者： Wen-Qiang Wu chun-feng wang Su-Ting Han Cao-feng Pan Institute of Microscale Optoelectronics College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Institute of Atomic Manufacturing Beihang UniversityBeijing 100191China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China

Remarkable developments in image recognition technology trigger demands for more advanced imaging *** recent years,traditional image sensors,as the go-to imaging devices,have made substantial progress in their optoelectronic characteristics and ***,a new breed of imaging device with information processing capability,known as neuromorphic vision sensors,is developed by mimicking biological *** this review,we delve into the recent progress of imaging devices,specifically image sensors and neuromorphic vision *** review starts by introducing their core components,namely photodetectors and photonic synapses,while placing a strong emphasis on device structures,working mechanisms and key performance *** it proceeds to summarize the noteworthy achievements in both image sensors and neuromorphic vision sensors,including advancements in large-scale and highresolution imaging,filter-free multispectral recognition,polarization sensitivity,flexibility,hemispherical designs,and self-power supply of image sensors,as well as in neuromorphic imaging and data processing,environmental adaptation,and ultra-low power consumption of neuromorphic vision ***,the challenges and prospects that lie ahead in the ongoing development of imaging devices are addressed.

关键词： Imaging devices Photodetectors Photonic synapses Image sensors Neuromorphic vision sensors

A Novel Genetic Algorithm for Global Optimization

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2020年第2期36卷 482-491页

作者： chun-feng wang Kui LIU Pei-ping SHEN College of Mathematics and Information.Henan Normal University Xinxiang 453007China Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal Control School of Mathematics and Information SciencesHenan Normal UniversityXinxiang 453007 China

This paper presents a novel genetic algorithm for globally solving un-constraint optimization *** this algorithm,a new real coded crossover operator is proposed ***,for improving the convergence speed and the searching ability of our algorithm,the good point set theory rather than random selection is used to generate the initial population,and the chaotic search operator is adopted in the best solution of the current *** experimental results tested on numerical benchmark functions show that this algorithm has excellent solution quality and convergence characteristics,and performs better than some algorithms.

关键词： genetic algorithm good point set chaotic search continuous optimization

Optimal Portfolio and Consumption Rule with a CIR Model Under HARA Utility

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2018年第1期6卷 107-137页

作者： chun-feng wang Hao Chang Zhen-Ming Fang College of Management and Economics Tianjin UniversityTianjin 300072China School of Science Tianjin Polytechnic UniversityTianjin 300387China

In the real-world environments,different individuals have different risk *** paper investigates the optimal portfolio and consumption rule with a Cox–Ingersoll–Ross(CIR)model in a more general utility *** consumption,an individual invests his wealth into the financial market with one risk-free asset and multiple risky assets,where the short-term rate is driven by the CIR model and stock price dynamics are simultaneously influenced by random sources from both stochastic interest rate and stock market *** individual hopes to optimize their portfolios and consumption rules to maximize expected utility of terminal wealth and intermediate *** preference of individual is assumed to satisfy hyperbolic absolute risk aversion(HARA)utility,which contains power utility,logarithm utility,and exponential utility as special *** using the principle of stochastic optimality and Legendre transform-dual theory,the explicit expressions of the optimal portfolio and consumption rule are *** sensitivity of the optimal strategies to main parameters is analysed by a numerical *** addition,economic implications are also *** research results show that Legendre transform-dual theory is an effective methodology in dealing with the portfolio selection problems with HARA utility and interest rate risk can be completely hedged by constructing specific portfolios.

关键词： CIR model Optimal portfolios and consumption rules HARA utility Legendre transform-dual theory Stochastic optimal control Economic implicati

Heterogeneous Fenton-like discoloration of methyl orange using Fe3O4/MWCNTs as catalyst： process optimization by response surface methodology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2016年第1期10卷 45-55页

作者： Huan-Yan XU Tian-Nuo SHI Hang ZHAO Li-Guo JIN feng-chun wang chun-Yan wang Shu-Yan QI School of Materials Science and Engineering Harbin University of Science and Technology Harbin 150040 China

Fe3O4/MWCNTs nanocomposites were prepared by chemical oxidation coprecipitation method and developed as highly efficient heterogeneous Fenton-like catalyst. XRD results revealed that Fe3O4 nanoparticles deposited onto MWCNTs surface remained the inverse spinel crystal structure of cubic Fe3O4 phase. The FTIR characteristic peaks of MWCNTs weakened or disappeared due to the anchor of Fe3O4 nanoparticles and Fe-O peak at 570 cm^-1 was indicative of the formation of Fe3O4. TEM observation revealed that Fe3O4 nanoparticles were tightly anchored by MWCNTs. The Fenton-like catalytic activity of Fe3O4/MWCNTs nanocomposites for the discoloration of methyl orange （MO） was much higher than that of Fe3O4 nanoparticles. The process optimization of this heterogeneous Fenton-like system was implemented by response surface methodology （RSM）. The optimum conditions for MO discoloration were determined to be of 12.3 mmoi/L H2O2 concentration, 2.9 glL catalyst dosage, solution pH 2.7 and 39.3 min reaction time, with the maximum predicted value for MO discoloration ratio of 101.85%. The corresponding experimental value under the identical conditions was obtained as 99.86%, which was very close to the predicted one with the absolute deviation of 1.99%.

关键词： Fe3O4/MWCNTs Fenton-like catalyst azo dye response surface methodology

New Practical Synthesis of Tetrahydronquinolin-2,5-diones

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第5期26卷 749-752页

作者： XIA De-xing feng chun wang Qiu-yan LU Cui-fen CHEN Zu-xing YANG Gui-chun Key Laboratory for the Synthesis and Application of Organic Functional Molecules Ministry of Education School of Chemistry and Chemical Engineering Hubei University Wuhan 430062 P. R. China

A series of 4,6,7,8-tetrahydro-2,5-（1H,3H）-quinolinediones was prepared from ethyl-2-cyanoacetate, aromatic aldehydes and 1,3-cyclohexanedione or 5,5-dimethyl-1,3-cyclohexanedione by two steps, the yields were moderate to excellent. This method is a new practical promising green strategy to synthesize tetrahydronquinolin-2,5-diones.

关键词： Tetrahydrobenzo[b]pyran Tetrahydronquinolin-2,5-dione Synthesis

Nondifferentiable Multiobjective Programming under Generalized d-ρ-(η,θ)-Type I Univexity

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research and Exposition 2011年第4期31卷 655-664页

作者： chun feng wang San Yang LIU Department of Mathematical Sciences Xidian University Shaanxi 710071 P. R. China College of Mathematics and Information Henan Normal University Henan 453007 P. R. China

In this puper, on the basis of notions of d-p-（η, θ）-invex function, type I function and univex function, we present new classes of generalized d-p-（η, θ）-type I univex functions. By using these new concepts, we obtain several sufficient optimality conditions for a feasible solution to be an efficient solution, and derive some Mond-Weir type duality results.

关键词： multiobjective programming generalized d-p-(η, θ)-type I univexity duality optimality.

Curcumin Synergizes with Cisplatin to Inhibit Colon Cancer through Targeting the MicroRNA-137-Glutaminase Axis

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2022年第1期42卷 108-117页

作者： Wen-hui FAN feng-chun wang Zhi JIN Lin ZHU Jian-xin ZHANG Department of Traditional Chinese Medicine the Second Hospital of Shandong UniversityJinan 250014China Department of Vascular Surgery the Second Hospital of Shandong UniversityJinan 250014China

Objective:Colorectal cancer(CRC)is one of the most lethal and prevalent malignancies ***,surgery,radiotherapy and chemotherapy are clinically applied as common approaches for CRC *** is one of the most frequently used chemotherapy drugs for diverse *** chemotherapeutic strategies have improved the prognosis and survival of cancer patients,development of cisplatin resistance has led to cancer ***,isolated from turmeric,has been used as an effective anti-cancer ***,the molecular mechanisms for curcumin-mediated cisplatin sensitivity of CRC have not been elucidated.

关键词： glutamine metabolism microRNA-137 curcumin cisplatin resistant glutamina

Effect of NLRC5 on activation and reversion of hepatic stellate cells by regulating the nuclear factor-κB signaling pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第24期25卷 3044-3055页

作者： Yan-Zhen Zhang Jian-Ning Yao Lian-feng Zhang chun-feng wang Xue-Xiu Zhang Bing Gao Department of Second Gastroenterology the First Affiliated Hospital of Zhengzhou University

BACKGROUND The formation of liver fibrosis is mainly caused by the activation of hepatic stellate cells(HSCs)and the imbalance of extracellular matrix(ECM)production and *** treatment of liver fibrosis mainly includes removing the cause,inhibiting the activation of HSCs,and inhibiting ***-like receptor(NLR)family,caspase activation and recruitment domain(CARD)domain containing 5/NOD27/CLR16.1(NLRC5)is a highly conserved member of the NLR family and is involved in inflammation and immune responses by regulating various signaling pathways such as nuclear factor-κB(NF-κB)*** has been found that NLRC5 plays an important role in liver fibrosis,but its specific effect and possible mechanism remain to be fully *** To investigate the role of NLRC5 in the activation and reversion of HSCs induced with transforming growth factor-β(TGF-β)and MDI,and to explore its relationship with liver *** A total of 24 male C57BL/6 mice were randomly divided into three groups,including normal,fibrosis,and recovery ***-four hours after a liver fibrosis and spontaneous reversion model was established,the mice were sacrificed and pathological examination of liver tissue was performed to observe the degree of liver fibrosis in each ***-2 cells were cultured in vitro and treated with TGF-β1 and ***-time quantitative PCR(qPCR)and Western blot were used to analyze the expression levels of NLRC5,α-smooth muscle actin(α-SMA),and collagen type I alpha1(Col1a1)in each *** activity of NF-κB in each group of cells transfected with NLRC5-siRNA was *** Compared with the normal mice,the expression level of NLRC5 increased significantly(P<0.01)in the fibrosis group,but decreased significantly in the recovery group(P<0.01).In in vitro experiments,the content of NLRC5 was enhanced after TGF-β1 stimulation and decreased to a lower level when treated with MDI(P<0.01).The expression ofα-SMA and Col1a1 proteins and mRN

关键词： NLRC5 Hepatic stellate cells Liver fibrosis Recovery

Pain and immune function in patients undergoing gastric cancer surgery following stellate ganglion block with total intravenous anesthesia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第9期16卷 2961-2967页

作者： Zhen Wu Hong-Qin Cai chun-feng wang Xiang-Yuan Yu Jie-Qiong wang Department of Anesthesiology The Kunshan Second People’s HospitalKunshan 215300Jiangsu ProvinceChina

BACKGROUND Stellate ganglion block is a commonly used sympathetic nerve block technique that restores the balance of the sympathetic and vagal nervous systems of the body and inhibits sympathetic nerve *** To analyze the effect of a stellate ganglion block combined with total diploma intravenous anesthesia on postoperative pain and immune function in patients undergoing laparoscopic radical gastric cancer(GC)surgery to provide a refe-rence basis for the formulation of anesthesia protocols for radical GC *** This study included 112 patients who underwent laparoscopic radical surgery for GC between January 2022 and March *** was no restriction on *** patient grouping method used was a digital random table method,and the num-ber of cases in each group was *** control group was administered total intravenous anesthesia,and the observation group compounded the stellate gan-glion block according to the total intravenous anesthesia *** hemodynamics,pain levels,and immune indices were compared between the *** The heart rate and mean arterial pressure in the observation group after in-tubation were lower than those in the control group(P0.05).The number of CD3+,CD4+,and CD4+/CD8+cells at the end of surgery was higher in the observation group than in the control group,and the number of CD8+cells was lower in the observation group than in the control group(P0.05).CONCLUSION The application of a stellate ganglion block combined with total intravenous anesthesia had no significant effect on postoperative pain levels in patients undergoing laparoscopic radical GC ***,it can safely reduce the effect of surgery on the immune function

关键词： Stellate ganglion block Total intravenous anesthesia Laparoscopy Radical gastric cancer surgery Immune