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Search Results: 1 - 10 of 70674 matches for " YU Gang "
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A New Transmission Control Protocol for Satellite Networks  [PDF]
Liang Yu, Gang Zhou
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.44031
Abstract: According to technical statistics, current TCP protocols with approximately 80% Internet applications run on perform very well on wired networks. However, due to the effects of long propagation delay, great bandwidth asymmetry, high sporadic Bit Error Rate (BER) and etc., TCP performance degrades obviously on the satellite communication networks. To avoid the problems, TP-S, a novel transport control protocol, is introduced for satellite IP networks. Firstly, in order to increase the increment speed of Congestion Window (cwnd) at the beginning of data transmission, the traditional Slow Start strategy is replaced by a new strategy, known as Super Start. Secondly, a new packet lost discriminated scheme based on IP packets alternately sending with different priority is used in the protocol to decouple congestion decision from errors. Thirdly, bandwidth asymmetry problem is avoided by adopting Modified NACK (M-NACK) in receiving ends, which is sent periodically. In addition, the sending strategy in routers is also modified along with other’s changes to support the protocol. Finally, the simulation experiments show that the new protocol can not only significantly enhance throughput performance, but also reduce sharply bandwidth used in the reverse path as compared with traditional TCP protocols and those protocols, which are recently proposed for satellite IP networks.
2,6-Diaminopyridinium dihydrogen phosphate
Gang Yu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812035489
Abstract: In the crystal structure of the title compound, C5H8N3+·H2PO4 , N—H...O hydrogen bonds, involving the unprotonated amino-group and the NH+ group in the pyridinium ring and dihydrogenphosphate O atoms, link the cations and anions. A long chain-like stacking of dihydrogenphosphate anions along the c-axis direction is constructed by O—H...O hydrogen bonds. Also along the c-axis direction, π–π stacking between inversion-related pyridinium rings [centroid–centroid distance = 3.8051 (10) ] forms columnar stacks of cations.
An Improved Task Scheduling Algorithm in Grid Computing Environment  [PDF]
Liang Yu, Gang Zhou, Yifei Pu
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.44027
Abstract: Algorithm research of task scheduling is one of the key techniques in grid computing. This paper firstly describes a DAG task scheduling model used in grid computing environment, secondly discusses generational scheduling (GS) and communication inclusion generational scheduling (CIGS) algorithms. Finally, an improved CIGS algorithm is proposed to use in grid computing environment, and it has been proved effectively.
Permanence and Almost Periodic Solutions of a Discrete Ratio-Dependent Leslie System with Time Delays and Feedback Controls
Gang Yu,Hongying Lu
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/358594
Abstract: We consider a discrete almost periodic ratio-dependent Lesliesystem with time delays and feedback controls. Sufficient conditions are obtainedfor the permanence and global attractivity of the system. Furthermore, by using analmost periodic functional Hull theory, we show that the almost periodic systemhas a unique globally attractive positive almost periodic solution.
Superficial Tumor Hyperthermia with Flat Left-Handed Metamaterial Lens
Yu Gong;Gang Wang
PIER , 2009, DOI: 10.2528/PIER09091401
Abstract: Flat left-handed metamaterial (LHM) lens can generate appropriate focusing spot in biological tissue as required in microwave tumor hyperthermia treatment. By using single flat LHM lens to concentrate microwave in a mass of tissue covered by water bolus, microwave hyperthermia scheme is proposed for superficial tumor hyperthermia. The power distribution in tissue is simulated by finite-difference time-domain method, and the thermal pattern is calculated by solving the bio-heat transfer equation. It is demonstrated that, by using a flat LHM lens of thickness of 4 cm to concentrate microwave of 2.45 GHz, a temperature above 42C can be achieved and maintained in one hour in a tissue region of about 1.0 cm in width and 1.2 cm in depth in tissue with the source amplitude of 43.40 V/cm, which is suitable for superficial tumor hyperthermia. By adjusting the position of microwave source, the heating zone in tissue can be adjusted in both the lateral and depth direction in tissue. The effects of fat layer and water bolus on the performance of hyperthermia are investigated as well.
Circulating galectin-3 in the bloodstream: An emerging promoter of cancer metastasis
Lu-Gang Yu
World Journal of Gastrointestinal Oncology , 2010,
Abstract: Increased concentrations of free circulating galectin-3 are commonly seen in the blood circulation of patients with many types of cancers including colorectal cancer. Recent studies have shown that changes in circulating galectin-3 levels in cancer patients may contribute significantly to the metastatic spread of disseminating cancer cells by enhancing their ability to adhere to blood vessel endothelium and by helping their avoidance of immune surveillance. Thus, targeting the galectin-3 actions in the circulation may hold significant promise for future development of novel therapeutic agents to prevent metastasis and reduce cancer-associated fatality.
Study of Hybrid Strategy for Ambulatory ECG Waveform Clustering
Gang Zheng,Tian Yu
Journal of Software , 2011, DOI: 10.4304/jsw.6.7.1257-1264
Abstract: A hybrid strategy has been proposed to reduce the wrong clustering on Ambulatory ECG (electrocardiogram). Since Ambulatory ECG is usually composed by 24 hours data, the number of individual ECG waveform can reach to 100,000, the request for accurate clustering result is highly required. The proposed strategy adopted some intelligent algorithms to solve the above problem. It clusters ECG waveform sample (selected from Ambulatory ECG) synchronously by Max-Min distance clustering algorithm, K-means algorithm and Simulated annealing algorithm first. And then, it adopted all three outputs from the above three algorithms as input on Back Propagation Artificial Neural Network (BP ANN). In the end, we got more accurate clustering result from the output of ANN. For testing the results, data of MIT/BIH arrhythmia database were used for experiments. After the controlled trial on MIT/BIH data, it can be safely concluded that the clustering result achieved by improved strategy can got more accurate than that by the traditional clustering algorithm. An average accuracy ratio is about 94.6%, 1.6% higher than k-means algorithm averagely and 1.3% higher than Simulated Annealing algorithm averagely.
Managing CMC-based Task through Text-based Dialogue: An Exploratory Study in a Chinese EFL Context
Lianfen Yu,Gang Zeng
English Language Teaching , 2011, DOI: 10.5539/elt.v4n4p221
Abstract: This paper examines EFL learners’ dialogic interaction in the implementation of a computer-mediated communication (CMC) task. Within the framework of sociocultural theory, the research focuses on how learners working in pairs collaboratively perform task management and build relationship in the synchronous CMC context. Sixteen Chinese tertiary EFL learners in eight self-selected pairs worked on an assigned task in the online chat rooms. We had a descriptive analysis of the data obtained from online chat logs, focusing on the task-related talk and off-task talk. Results indicate that learners’ task-related talk has a variety of functions and facilitates the establishment and maintenance of task intersubjectivity. The findings also reveal the positive role of off-task talk in facilitating this online learning activity.
Spin filter and spin valve in ferromagnetic graphene
Yu Song,Gang Dai
Physics , 2015, DOI: 10.1063/1.4921668
Abstract: We propose and demonstrate that a EuO-induced and top-gated graphene ferromagnetic junction can be simultaneously operated as a spin filter as well as a spin valve. We attribute such a remarkable result to a coexistence of a half-metal band and a common energy gap for opposite spins in ferromagnetic graphene. We show that, both the spin filter and the spin valve can be effectively controlled by a back gate voltage, and they survive for practical metal contacts and finite temperature. Specifically, larger single spin currents and on-state currents can be reached with contacts with work functions similar to graphene, and the spin filter can operate at higher temperature than the spin valve.
Application of Information Theory in Nuclear Liquid Gas Phase Transition
Yu-Gang Ma
Physics , 2001, DOI: 10.1103/PhysRevLett.83.3617
Abstract: Information entropy and Zipf's law in the field of information theory have been used for studying the disassembly of nuclei in the framework of the isospin dependent lattice gas model and molecular dynamical model. We found that the information entropy in the event space is maximum at the phase transition point and the mass of the cluster show exactly inversely to its rank, i.e. Zipf's law appears. Both novel criteria are useful in searching the nuclear liquid gas phase transition experimentally and theoretically.
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