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Two Efficient Parameterized Boundaries for Vee's Asian Option Pricing PDE

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Acta Mathematicae Applicatae Sinica 2012年第4期28卷 643-652页

作者： Bai-min yu School of International Trade and Economics University of International Business and Economics

In this paper, we derive two general parameterized boundaries of finite difference scheme for VeSe~＇s PDE which is used to price both fixed and floating strike Asian options. Using these two boundaries, we can deal with all kinds of situations, especially, some extreme cases, like overhigh volatility, very small volatility, etc, under which the Asian option is usually mispriced in many existing numerical methods. Numerical results show that our boundaries are pretty efficient.

关键词： Asian option Vecer's PDE finite difference parameterized boundaries sensitivity

Effect of acacetin on inhibition of apoptosis in Helicobacter pyloriinfected gastric epithelial cell line

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World Journal of Gastrointestinal Oncology 2024年第8期16卷 3624-3634页

作者： Qi-Xi Yao Zi-yu Li hou-Le Kang Xin He min Kang Department of Gastroenterology The Affiliated Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Orthopaedics The Affiliated Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Emergency Luzhou People’s HospitalLuzhou 646000Sichuan ProvinceChina

BACKGROUND Helicobacter pylori(***)infection can cause extensive apoptosis of gastric epithelial cells,serving as a critical catalyst in the progression from chronic gastritis,gastrointestinal metaplasia,and atypical gastric hyperplasia to gastric *** eradication of *** is paramount for ameliorating the pathophysiological conditions associated with chronic inflammation of the gastric mucosa and the primary prevention of gastric ***,which has multifaceted pharmacological activities such as anti-cancer,anti-inflammatory,and antioxidative properties,has been extensively investigated across various ***,the impact and underlying mechanisms of action of acacetin on ***-infected gastric mucosal epithelial cells remain *** To explore the defensive effects of acacetin on apoptosis in ***-infected GES-1 cells and to investigate the underlying *** GES-1 cells were treated with *** and acacetin in *** viability was assessed using the CCK-8 assay,cell mortality rate via lactate dehydrogenase assay,alterations in cell migration and healing capacities through the wound healing assay,rates of apoptosis via flow cytometry and TUNEL staining,and expression levels of apoptosis-associated proteins through western blot *** *** infection led to decreased GES-1 cell viability,increased cell mortality,suppressed cell migration,increased rate of apoptosis,increased expressions of Bax and cle-caspase3,and decreased Bcl-2 ***,acacetin treatment enhanced cell viability,mitigated apoptosis induced by *** infection,and modulated the expression of apoptosis-regulatory proteins by upregulating Bcl-2 and downregulating Bax and cleaved *** Acacetin significantly improved GES-1 cell viability and inhibited apoptosis in ***-infected GES-1 cells,thereby exerting a protective effect on gastric mucosal epithelial cells.

关键词： Gastric epithelial GES-1 cells Helicobacter pylori Infection Acacetin Antibiotic resistance Apoptosis

Adaptive fuze-warhead coordination method based on BP artificial neural network

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Defence Technology（防务技术） 2023年第11期29卷 117-133页

作者： Peng hou Yang Pei yu-xue Ge School of Aeronautics Northwestern Polytechnical UniversityXi'an710072ShaanxiChina

The appropriate fuze-warhead coordination method is important to improve the damage efficiency of air defense missiles against aircraft targets. In this paper, an adaptive fuze-warhead coordination method based on the Back Propagation Artificial Neural Network(BP-ANN) is proposed, which uses the parameters of missile-target intersection to adaptively calculate the initiation delay. The damage probabilities at different radial locations along the same shot line of a given intersection situation are calculated, so as to determine the optimal detonation position. On this basis, the BP-ANN model is used to describe the complex and highly nonlinear relationship between different intersection parameters and the corresponding optimal detonating point position. In the actual terminal engagement process, the fuze initiation delay is quickly determined by the constructed BP-ANN model combined with the missiletarget intersection parameters. The method is validated in the case of the single-shot damage probability evaluation. Comparing with other fuze-warhead coordination methods, the proposed method can produce higher single-shot damage probability under various intersection conditions, while the fuzewarhead coordination effect is less influenced by the location of the aim point.

关键词： Aircraft vulnerability Fuze-warhead coordination BP artificial neural network Damage probability Initiation delay

Three-dimensional physical simulation and optimization of water injection of a multi-well fractured-vuggy unit

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Petroleum Science 2016年第2期13卷 259-271页

作者： Ji-Rui hou Ze-yu Zheng Zhao-Jie Song min LUO Hai-Bo Li Li Zhang Deng-yu yuan Research Institute of Enhanced Oil Recovery China University of Petroleum Beijing 102249 China Key Laboratory of Marine Facies Sinopec Beijing 102249China Key Laboratory of Petroleum Engineering Ministry of Education Beijing 102249 China

With complex fractured-vuggy heterogeneous structures, water has to be injected to facilitate oil pro- duction. However, the effect of different water injection modes on oil recovery varies. The limitation of existing numerical simulation methods in representing fractured- vuggy carbonate reservoirs makes numerical simulation difficult to characterize the fluid flow in these reservoirs. In this paper, based on a geological example unit in the Tahe Oilfield, a three-dimensional physical model was designed and constructed to simulate fluid flow in a fractured-vuggy reservoir according to similarity criteria. The model was validated by simulating a bottom water drive reservoir, and then subsequent water injection modes were optimized. These were continuous （constant rate）, intermittent, and pulsed injection of water. Experimental results reveal that due to the unbalanced formation pressure caused by pulsed water injection, the swept volume was expanded and consequently the highest oil recovery increment was achieved. Similar to continuous water injection, intermit- tent injection was influenced by factors including the connectivity of the fractured-vuggy reservoir, well depth, and the injection-production relationship, which led to a relative low oil recovery. This study may provide a constructive guide to field production and for the devel- opment of the commercial numerical models specialized for fractured-vuggy carbonate reservoirs.

关键词： Multi-well fractured-vuggy unit Three-dimensional physical model Similarity criteria Bottom water drive. Optimization of water injection mode

CBERS-02 Application Assessment

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空间科学学报 2004年第Z1期24卷 46-59页

作者： GUO Jianning yu Jin min Xiangjun LI Xingchao hou minghui China Center for Resources Satellite Data and Application Beijing 100830 China China Center for Resources Satellite Data and Application Beijing 100830 China China Center for Resources Satellite Data and Application Beijing 100830 China China Center for Resources Satellite Data and Application Beijing 100830 China China Center for Resources Satellite Data and Application Beijing 100830 China

As the successor of CBERS-01, CBERS-02 was launched successfully on 21October 2003 and transmitted its first downlink data the next day. According to the OBT (On Board Test) outline, CRESDA cooperated with CAST and many remote sensing organizations in China in implementing the test of the satellite payloads, ground processing system and data application. In this paper, the test is briefly illustrated in three parts: Ⅰ. Satellite Parameters Test (especially the test for payloads), Ⅱ. Payload Image Quality Assessment, and Ⅲ. Data Application Assessment. The results of the test show that the image quality of CBERS-02 is much improved over CBERS-01 and will continue to play a more important role in the society and economic development of China.

关键词： CBERS-02, Application System, On Board Test

Emerging applications of radiomics in rectal cancer:State of the art and future perspectives

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World Journal of Gastroenterology 2021年第25期27卷 3802-3814页

作者： min hou Ji-Hong Sun Department of Radiology Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016Zhejiang ProvinceChina

Rectal cancer(RC)is the third most commonly diagnosed cancer and has a high risk of mortality,although overall survival rates have *** assessments and predictions,including risk stratification,responses to therapy,long-term clinical outcomes,and gene mutation status,are crucial to guide the optimization of personalized treatment *** is a novel approach that enables the evaluation of the heterogeneity and biological behavior of tumors by quantitative extraction of features from medical *** these extracted features cannot be captured by visual inspection,the field holds significant *** studies have proved the rapid development of radiomics and validated its diagnostic and predictive ***,existing radiomics research on RC is highly heterogeneous due to challenges in workflow standardization and limitations of objective cohort ***,we present a summary of existing research based on computed tomography and magnetic resonance *** highlight the most salient issues in the field of radiomics and analyze the most urgent problems that require *** review provides a cutting-edge view of the use of radiomics to detect and evaluate RC,and will benefit researchers dedicated to using this state-of-the-art technology in the era of precision medicine.

关键词： Computed tomography Magnetic resonance imaging Radiomics Rectal cancer Clinical applications Overall survival

Analytic Invariant Curves for an Iterative Equation Related to Ricker-type Second-order Equation

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Acta Mathematica Sinica,English Series 2021年第7期37卷 1041-1052页

作者： hou yu ZHAO Michal FECKAN School of Mathematics Chongqing Normal UniversityChongqing 401331P.R.China Department of Mathematical Analysis and Numerical Mathematics Comenius University in BratislavaMlynska dolina84248 BratislavaSlovakia Mathematical Institute of Slovak Academy of Sciences Stefanikova 4981473 BratislavaSlovakia

In this paper,we consider the existence of analytic invariant curves of an iterative equation f(f(x))=xea-x-f(x)which arises from Ricker-type second-order *** reducing the equation with the Schr?der transformation to an auxiliary equation,the author discusses not only that the parameter at resonance,i.e.,at a root of the unity,but also the parameter near resonance under the Brjuno condition.

关键词： Difference equation invariant curves analytic solution small divisor

Heat Transfer Characteristics of a Microchannel Heat Sink with Highly-Dense Micro-Jet Arrays

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Journal of Thermal Science 2024年第3期33卷 1148-1160页

作者： ZHANG yu CHEN Xiaoyan MIAO Lin CHEN Liang hou yu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China Beijing Aerospace Technology Institute Beijing100083China

This paper proposed a new structure of highly-dense micro-jet arrays for hybrid jet-impingement/microchannel heat sinks(~120 jet per cm^(2) with jet width of 0.35 mm).Parametric study is performed to investigate the influence of structure and flow parameters on the convective heat transfer of water jet cooling in confined *** simulation results show that the optimal jet width,jet spacing and impingement distance are around 0.2 mm,0.2 mm and 0.3 mm,respectively,which can achieve a low thermal resistance as well as a relatively low pressure *** analysis of the heat transfer pathways shows that the micro-fin jet structures can extend the impinging heat transfer area and conduct a considerable proportion of heat,which can reach up to 38.9%with the Reynolds number ranging from 797.1 to *** heat transfer characteristics in the heat sink will shift from impingement dominated heat transfer to the channel-convection dominated heat transfer as the jet impingement distance increases.A correlation is proposed to predict the average Nusselt number on the stagnation area for the heat sink with different structure parameters,and the deviations of predictions from the numerical results are less than 10%.

关键词： hybrid heat sink impingement microchannel thermal management high heat flux

Microstructure control of organic semiconductors via UV-ozone for high-sensitivity NO2 detection

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Science China(Technological Sciences) 2021年第5期64卷 1057-1064页

作者： hou SiHui FAN HuiDong WU MengGe yu XinGe yu JunSheng State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China Department of Biomedical Engineering City University of Hong KongHong KongChina

Developing high sensitive organic semiconductors(OSCs)in organic thin-film transistors(OTFTs)is the key for OTFT based gas ***,we report a simple processing route of highly sensitive OSCs for high performance OTFT based nitrogen dioxide(NO2)sensors,where the active OSC layer is based on ultraviolet-ozone(UVO)treated poly(3-hexylthiophene-2,5-diyl)(P3HT).Compared to conventional P3HT based OTFT sensors,the reported device exhibits a remarkable improvement of the gas response from 350%to 30000%.The studies in morphologies,chemical compositions and microstructures of the UVOtreated films reveal that a large number of carrier traps generated in the P3HT films is the decisive reason for the enhancement of sensing ***,the optimized device shows great potential of practical applications on the stand points of sensitivity,selectivity,reusability and the ability of recovery,as well as limit of detection of~7.3 *** simple method provides an innovative understanding for the role of the carrier traps in sensing performance and demonstrates a bright future for developing high performance OTFT gas sensors.

关键词： ultraviolet-ozone organic thin-film transistors gas sensors carrier traps nitrogen dioxide