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Credit Determination of Fibre Channel in Avionics Environment

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Chinese Journal of Aeronautics 2007年第3期20卷 247-252页

作者： LIN qiang XIONG Hua-gang ZHANG qi-shan School of Electronic and Information Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

Fibre channel （FC） is the main candidate architecture for ＂unified network＂. Flow control deals with the problem in which a device receives frames faster than it can process them. Credit is an important service parameter for fibre channel flow control. Configuring the credit reasonably can avoid buffer overflow in nodes. This paper derives the mathematic relationships among credit, bandwidth and message sets under real-time condition according as three main topologies of fibre channel, and proposes the credit determination and the optimal credit for typical message sets. This study is based on the features of hard real-time communications in avionics environment.

关键词： fibre channel topology login credit hard real-time condition

Subseasonal predictability of the transition of the stratospheric polar vortex:A case study in winter 1987/88

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Atmospheric and Oceanic Science Letters 2023年第2期16卷 28-34页

作者： qi shan Ke Fan Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiChina University of the Chinese Academy of Sciences BeijingChina

平流层极涡作为冬季次季节尺度上一个重要的可预测性来源,其强度在1987/88年冬季表现为1979-2019年最显著的转折,即在前(后)冬极端偏弱(强),因此在本文中选取这一个例研究了该年冬季平流层极涡在次季节尺度上的可预测性,结果表明弱极涡... 详细信息

平流层极涡作为冬季次季节尺度上一个重要的可预测性来源,其强度在1987/88年冬季表现为1979-2019年最显著的转折,即在前(后)冬极端偏弱(强),因此在本文中选取这一个例研究了该年冬季平流层极涡在次季节尺度上的可预测性,结果表明弱极涡和强极涡事件的预测与模式能否准确预测上传行星波的强度紧密相关,同时,发现前期对流层欧亚遥相关波列可能是弱极涡事件发生的关键预兆信号.此外,模式对平流层极涡强度和北大西洋涛动预测误差之间存在显著正相关关系,表明模式减少平流层极涡的预测误差可能可以提高北大西洋涛动及相关对流层气候预测.

关键词：平流层极涡转折可预测性次季节预测

Revisiting the X-ray emission of the asynchronous polar V1432 Aql

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Research in Astronomy and Astrophysics 2021年第12期21卷 499-508页

作者： qi-shan Wang Sheng-Bang qian Li-Ying Zhu Yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory of the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China

As the only eclipsing asynchronous polar,V1432 Aql provides an excellent laboratory to study the interaction between the accreted matter and the magnetic ***,we report an analysis of the X-ray data from the contemporaneous NuSTAR and Swift-XRT *** X-ray data present a profile with a low-intensity state for almost half an orbital period,a dip at 0.6 phase,and a peak at 0.75 phase,which suggests that there was only one accretion region during the observation and the claim is supported by the spectral *** comparison with the previous data indicates that the X-ray data have an orbital modulation,as the case in BeppoSAX,rather than a spin one observed in *** attribute the orbit and spin modulations to the different accretion geometries at *** spectral analysis of the wide-band data presents a significant reflection effect,a commonly observed soft X-ray temperature,and the energy balance in V1432 ***,we obtained a low total accretion rate of 1.3×10~(-10)M yr~(-1)and a high specific accretion rate of 3.8 g cm~(-2)s~(-1)which explains the strong reflection from the surface of the white ***,due to its complex emission,a more physical understanding of its accretion geometry is still outstanding.

关键词： stars:individual(V1432 Aql) cataclysmic variables:asynchronous polars

Construction of Orthogonal Arrays without Interaction Columns

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Acta Mathematicae Applicatae Sinica 2022年第1期38卷 159-168页

作者： shan-qi PANG Ya-ping WANG Ming-yao AI School of Mathematics and Information Science Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal ControlHenan Normal UniversityXinxiang 453007China KLATASDS-MOE School of StatisticsEast China Normal UniversityShanghai 200062China LMAM School of Mathematical Sciences and Center for Statistical SciencePeking UniversityBeijing 100871China

In this paper a new class of orthogonal arrays(OAs),i.e.,OAs without interaction columns,are proposed which are applicable in factor screening,interaction detection and other *** the tools of difference matrices,we present some general recursive methods for constructing OAs of such *** families of OAs with high percent saturation are *** particular,for any integerλ≥3,such a two-level OA of run 4λcan always be obtained if the corresponding Hadamard matrix exists.

关键词： complex aliasing difference matrix Hadamard matrix Kronecker sum symmetric array

Wake flow and vortex structures behind emergent vegetation patches elongated in the longitudinal direction

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Journal of Hydrodynamics 2021年第6期33卷 1148-1161页

作者： Zi-jian Yu Yu-qi shan Chao Liu Xing-nian Liu State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Department of Civil and Environmental Engineering University of AlbertaEdmontonCanada Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu 610065China

In natural rivers,patches of vegetation generally expand over their steady wake region in the streamwise direction,forming elongated patches with length(L)greater than their width(b).This paper studies how the wake flows and the vortices develop as the emergent patches expand their length in the streamwise *** patches are modeled with the same width but different lengths in laboratory *** the patches,the steady wake region(L_(w))is not related to the width-related flow blockage(C_(d)ab),where C_(d) is the drag coefficient,a is the vegetation ***,L_(w) is related to the length-related flow blockage(C_(d)aL).On this basis,a model is proposed for predicting L_(w),which is in good agreement with the *** a patch becomes denser and/or longer(as C_(d)aL increases),the steady wake region becomes shorter(L_(w) decreases),and vortices are observed closer to the patch trailing edge,producing a turbulence of a greater magnitude beyond L_(w).When the flow blockage increases to the limit(C_(d)aL>8),the Karman vortices are observed directly behind the porous *** results can be used to explain the longitudinal elongation of the vegetation patches in the field.

关键词： Velocity profiles turbulent kinetic energy wakes vortex streets vegetation patch

New Insight into the Origins of Itch and Pain:How are Itch and Pain Signals Coded and Discriminated by Primary Sensory Neurons?

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Neuroscience Bulletin 2021年第4期37卷 575-578页

作者： Yue Hu Wen-qi shan Bin Wu Tong Liu Jiangsu Key Laboratory of Neuropsychiatric Diseases and Institute of Neuroscience Soochow UniversitySuzhou215123China Institute of Pain Medicine and Special Environmental Medicine Nantong UniversityNantong226019China College of Life Sciences Yanan UniversityYanan716000China

The unpleasant sensations itch and pain induce distinct behavioral *** both acute itch and pain serve protective functions,they are different sensory *** stimuli lead to the scratching reflex or the desire to scratch,which may be helpful for removing potential *** contrast,pain stimuli lead to withdrawal behaviors but not scratching[1].

关键词： removing protective sensation

Power allocation in cooperative MIMO systems under individual power constraints

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 1-6页

作者： YANG shan CUI qi-mei XU Yue-qiao LUO Yuan Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

allocation （PA） plays an important role in capacity improvement for cooperative multiple-input multipleoutput （Co-MIMO） systems. Many contributions consider a total power constraint （TPC） on the sum of transmit power from all nodes in addressing PA problem. However, in practical implementations, each transmit node is equipped with its own power amplifier and is limited by individual power constraint （IPC）. Hence these PA methods under TPC are not realizable in practical systems. Meanwhile, the PA problem under IPC is essential, but it has not been studied. This paper extends the traditional non-cooperative water-filling PA algorithm to IPC-based Co-MIMO systems. Moreover, the PA matrix is derived based on the compound channel matrix from all the cooperative nodes to the user. Therefore, the cooperative gain of the IPC-based Co-MIMO systems is fully exploited, and further the maximal instantaneous capacity is achieved. Numerical simulations validate that, under the same IPC conditions, the proposed PA scheme considerably outperforms the non-cooperative water-filling PA and uniform PA design in terms of ergodic capacity.

关键词： power allocation cooperative MIMO individual power constraint ergodic capacity

Construction of a Class of Quantum Boolean Functions Based on the Hadamard Matrix

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Acta Mathematicae Applicatae Sinica 2015年第4期31卷 1013-1020页

作者： Jiao DU shan-qi PANG qiao-yan WEN Jie ZHANG College of Mathematics and Information Science Henan Normal University Henan Engineering Laboratory for Big Data Statistical Analysis and Optimal Control Henan Normal University State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications School of Science Beijing University of Posts and Telecommunications

In this study, a new methodology based on the Hadamard matrix is proposed to construct quantum Boolean functions f such that f ： I2n --2P2n, where I2n is an identity matrix of order 2n and P2n is a projective matrix ... 详细信息

关键词： quantum information matrix image quantum boolean function projective matrix

Histone Deacetylase Inhibition:An Important Mechanism in the Treatment of Lymphoma

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Clinical oncology and cancer researeh 2012年第2期9卷 85-89页

作者： shan-qi Guo Yi-zhuo Zhang Department of Hematology Tianjin Medical University Cancer Institute and HospitalKey Laboratory of Cancer Prevention and Therapy of Tianjin

Lymphomas enconlpass a group of malignancies that originate in the lymph nodes or other lymphoid tissues. Epigenetic modification, especially by histone deacetylase （HDACs）, plays a key role during the occurrence and development of lymphomas. Consequently, HDAC inhibitors （HDACIs）, a class of gene expression-modulating drugs, have emerged as promising mechanism-based agents for the treatment of lymphomas. This review presents the rationale of HDAC inhibition, describes the epigenetic-based mechanisms of action of HDACIs, discusses their clinical efficiency, and summarizes the current and future developments in this field.

关键词： lymphoma histone deacetylases therapeutics epigenomics