scholarly journals Performance Analysis and Optimization of CRNs Based on Fixed Feedback Probability Mechanism with Two Classes of Secondary Users

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yuan Zhao ◽  
Hongyi Li ◽  
Jiemin Liu
Keyword(s):  
Performance Indicators ◽  
Three Dimensional ◽  
Secondary Users ◽  
Lower Priority ◽  
Fixed Parameter ◽  
One Step ◽  
The One ◽  
The Impact ◽  
Retransmission Control ◽  
Transfer Probability

In this paper, we conduct a research based on the classified secondary users (SUs). SUs are divided into two categories: higher-priority SU1 and lower-priority SU2, and two types of users generate two types of packets, respectively. Due to the lowest spectrum usage rights of SU2 packets, the SU2 packets’ transmission is easily interrupted by other packets with higher rights. With the purpose of controlling the SU2 packets’ retransmission behavior, we introduce two system parameters, namely, feedback threshold T and feedback probability q. When the amount of SU2 packets in the buffer reaches the feedback threshold T, the interrupted SU2 packets either enter the buffer with probability q for retransmission or leave the channel by probability 1−q, where q is a fixed parameter. We construct a three-dimensional Markov model based on the presented retransmission control mechanism and derive some important performance indicators of SU2 packets based on the one-step transfer probability matrix and steady-state distribution. Then, we analyze the impact of some key parameters on the performance indicators through numerical experiments. Finally, we establish a cost function and use particle swarm optimization algorithm to optimize the feedback threshold and feedback probability.

scholarly journals Stress Transfer Mechanism of Flange in Split Hopkinson Tension Bar

2020 ◽  
Vol 10 (21) ◽  
pp. 7601
Author(s):  
Hyunho Shin ◽  
Sanghoon Kim ◽  
Jong-Bong Kim
Keyword(s):  
Stress Transfer ◽  
Transfer Mechanism ◽  
Explicit Finite Element ◽  
Impact Theory ◽  
Quantitative Basis ◽  
Split Hopkinson ◽  
One Step ◽  
The One ◽  
The Impact ◽  
Split Hopkinson Tension Bar

To reveal the stress transfer mechanism of the flange in a split Hopkinson tension bar, explicit finite element analyses of the impact of the hollow striker on the flange were performed across a range of flange lengths. The tensile stress profiles monitored at the strain gauge position of the incident bar are interpreted on a qualitative basis using three types of stress waves: bar (B) waves, flange (F) waves, and a series of reverberation (Rn) waves. When the flange length (Lf) is long (i.e., Lf > Ls, where Ls is the striker length), the B wave and first reverberation wave (R1) are fully separated in the time axis. When the flange length is intermediate (~Db < Lf < Ls, where Db is the bar diameter), the B and F waves are partially superposed; the F wave is delayed, then followed by a series of Rn waves after the superposition period. When the flange length is short (Lf < ~Db), the B and F waves are practically fully superposed and form a pseudo-one-step pulse, indicating the necessity of a short flange length to achieve a neat tensile pulse. The magnitudes and periods of the monitored pulses are consistent with the analysis results using the one-dimensional impact theory, including a recently formulated equation for impact-induced stress when the areas of the striker and bar are different, equations for the reflection/transmission ratios of a stress wave, and an equation for pulse duration time. This observation verifies the flange length-dependent stress transfer mechanism on a quantitative basis.

scholarly journals (3Z)-3-[(Z)-2-(2-Oxoindolin-3-ylidene)hydrazin-1-ylidene]indolin-2-one 0.17-hydrate

2014 ◽  
Vol 70 (6) ◽  
pp. o721-o721
Author(s):  
Yong-Hong Liu ◽  
Lei Zhao ◽  
Ming-Xuan Liu ◽  
Hai Lin ◽  
Jing-Jing Li
Keyword(s):  
Hydrogen Bonds ◽  
Microwave Irradiation ◽  
Organic Molecule ◽  
Condensation Reaction ◽  
Three Dimensional ◽  
Water Molecules ◽  
Inversion Symmetry ◽  
Compound C ◽  
One Step ◽  
The One

In the title compound, C16H10N4O2·0.17H2O, prepared by the one-step condensation reaction of isatin with hydrazine hydrate under microwave irradiation, the complete organic molecule is generated by crystallographic inversion symmetry and therefore exists in anS-transconformation. In the crystal, molecules are linked by N—H...O hydrogen bonds, generating a three-dimensional framework with [001] channels, which are occupied by the disordered water molecules.

Three-dimensional effects in low-strain integrity testing of piles: analytical solution

2016 ◽  
Vol 53 (2) ◽  
pp. 225-235 ◽  
Author(s):  
Changjie Zheng ◽  
George P. Kouretzis ◽  
Xuanming Ding ◽  
Hanlong Liu ◽  
Harry G. Poulos
Keyword(s):  
Impact Load ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Integrity Testing ◽  
Integrity Tests ◽  
The One ◽  
Propagation Of Waves ◽  
The Impact ◽  
Pile Integrity ◽  
Elastic Soil

The interpretation of low-strain integrity tests of piles is commonly based on methods developed around the one-dimensional wave propagation theory. In reality, waves resulting from the impact of a hammer on a pile head propagate in three dimensions, and the validity of the plane-front assumption is rather questionable for cases where the size of the hammer is small relative to that of the pile. This paper presents an analytical model of the dynamic response of a pile to an impact load on its head, considering propagation of waves in both vertical and radial directions. The proposed formulation applies to a pile of finite length embedded in multilayered elastic soil, and allows for considering both shape and material pile defects, by reducing locally the radius of the pile cross section or the Young’s modulus of its material. Arithmetic examples are used to depict the effect of high-frequency interferences on the interpretation of pile integrity tests, which can only be accounted for in the three-dimensional formulation of the problem, and lead to practical suggestions for the interpretation of such tests.

scholarly journals Professional Mobility and “Objective” and “Subjective” Satisfaction. a Non- Linear Analysis from the Theory of the Three-Dimensional Spiral of Sense in Population of Doctors

2016 ◽  
Vol 6 (1) ◽  
pp. 52
Author(s):  
Miriam Aparicio
Keyword(s):  
Social Representations ◽  
Three Dimensional ◽  
Professional Status ◽  
Structural Factors ◽  
Professional Careers ◽  
Professional Mobility ◽  
National University ◽  
Micro Level ◽  
The One ◽  
The Impact

This work goes along the lines of the author’s research (1995-2016) on professional careers and models bearing causes and effects regarding sustained interaction (core, psychosocial, institutional and structural factors). The aim of this paper was analyze, through the doctors’ social representations, the levels of satisfaction evidenced by those who have advanced professionally to the highest positions within the scientific (or other) system. The hypothesis states that the relation is not linear but inverse. Satisfaction would not increase according to the Professional Status. We consider here, on the one hand, the insufficient Professionalization and the increasing demands from the market; and on the other, the impact structural limits have on the micro level. The methodology used was quanti-qualitative (semi-structured questionnaires, interviews, and hierarchical evocations). The population consisted of doctors (2005-2012) from the National University of Cuyo, in Argentina and the Cnam (France) of different courses of study. The results confirm the hypothesis. As regards what was observed among those who advanced professionally, the increase on the growing market demands along with the lack of institutionalized means in order to reach goals, result in lower satisfaction. This is interpreted from the theory of the author, which involves 3 levels (macro-meso-micro-macro) (Aparicio, 2015 a, b). We also consider the theories of anomie and of the expectancy of valence (Feather - Davenport). Findings along this line were also seen in studies with scientists (Aparicio, 2014). The results propose a revision in the prevailing working conditions and police: satisfaction acts on subsystems and consolidates them.

Sentinel Nodal Micrometastases Detected by the One- Step Nucleic Acid Amplification Whole Node Assay and the Impact on Adjuvant Treatment and Outcomes in Early Breast Cancers: The First Report from Thailand

2021 ◽  
Vol 104 (5) ◽  
pp. 764-771
Keyword(s):  
Adjuvant Treatment ◽  
Survival Benefit ◽  
Systemic Chemotherapy ◽  
Lymph Node Biopsy ◽  
Nucleic Acid Amplification ◽  
Node Biopsy ◽  
One Step ◽  
The One ◽  
The Impact ◽  
Osna Assay

Background: The advent of sentinel lymph node biopsy (SLNB) and improvements in histopathological and molecular analysis have increased the detection rate of nodal micrometastases. As compare with conventional method, the one-step nucleic acid amplification (OSNA) assay might detect higher cases of SLN micrometastases. Objective: The present study aimed to assess the impact of OSNA assay on micrometastases detection rate and potential benefit in terms of adjuvant treatment and survival outcome in early breast cancer. Materials and Methods: A retrospective review of patients with sentinel node (SLN) micrometastasis detected by the OSNA assay between 2015 and 2019 was carried out. Clinicopathological, adjuvant treatment, and follow-up data were collected. Ten-year survival benefit with adjuvant chemotherapy was calculated using PREDICT online, version 1.2 (https://breast.predict.nhs.uk/). Results: Between November 2015 and December 2019, 78 out of 721 patients (10.8%) were positive for micrometastasis based on OSNA detection. Three-fourth of cases received adjuvant systemic chemotherapy and 57% were given taxane-based regimen. Using the PREDICT online tool, an estimated 10-year survival in patients who received adjuvant systemic chemotherapy and who did not, were 75% and 66%, respectively (p=0.018). A 10-year survival benefit from chemotherapy among patients who received systemic chemotherapy was 8% compared with 4% with no-adjuvant-therapy cohort. Conclusion: The OSNA assay allows for a more precise detection of SLN micrometastasis compared to conventional pathology and could guide therapeutic decision making. In patients with micrometastasis who received adjuvant systemic chemotherapy, the estimated overall 10-year survival was improved. Keywords: Axillary staging, Breast cancer, Micrometastases, OSNA, Sentinel lymph node biopsy

Aerodynamic Analysis of a Multistage Centrifugal Compressor

2003 ◽  
Author(s):  
Duccio Bonaiuti ◽  
Andrea Arnone ◽  
Alberto Milani ◽  
Leonardo Baldassarre
Keyword(s):  
Flow Field ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Operating Range ◽  
Aerodynamic Analysis ◽  
Critical Elements ◽  
Multi Stage ◽  
The One ◽  
Multistage Centrifugal Compressor ◽  
The Impact

The aerodynamic analysis of a four–stage centrifugal compressor was performed by means of a three–dimensional multi stage CFD code. The whole operating range of the compressor was investigated and the critical elements affecting the choke and stall limit were identified. The isolated impellers were also analyzed separately and the flow field was compared to the one coming from the multistage analysis. This allowed us to study the effect of the interactions between components and quantify the impact of the multistage environment on the impellers’ performance.

scholarly journals An evaluation of adhesive sample holders for advanced crystallographic experiments

2014 ◽  
Vol 70 (9) ◽  
pp. 2390-2400 ◽  
Author(s):  
Marco Mazzorana ◽  
Juan Sanchez-Weatherby ◽  
James Sandy ◽  
Carina M. C. Lobley ◽  
Thomas Sorensen
Keyword(s):  
Three Dimensional ◽  
X Ray Diffraction ◽  
Porous Support ◽  
Step Procedure ◽  
Alternative Approach ◽  
Hydration State ◽  
Different Types ◽  
One Step ◽  
The Impact

The hydration state of macromolecular crystals often affects their overall order and, ultimately, the quality of the X-ray diffraction pattern that they produce. Post-crystallization techniques that alter the solvent content of a crystal may induce rearrangement within the three-dimensional array making up the crystal, possibly resulting in more ordered packing. The hydration state of a crystal can be manipulated by exposing it to a stream of air at controlled relative humidity in which the crystal can equilibrate. This approach provides a way of exploring crystal hydration space to assess the diffraction capabilities of existing crystals. A key requirement of these experiments is to expose the crystal directly to the dehydrating environment by having the minimum amount of residual mother liquor around it. This is usually achieved by placing the crystal on a flat porous support (Kapton mesh) and removing excess liquid by wicking. Here, an alternative approach is considered whereby crystals are harvested using adhesives that capture naked crystals directly from their crystallization drop, reducing the process to a one-step procedure. The impact of using adhesives to ease the harvesting of different types of crystals is presented together with their contribution to background scattering and their usefulness in dehydration experiments. It is concluded that adhesive supports represent a valuable tool for mounting macromolecular crystals to be used in humidity-controlled experiments and to improve signal-to-noise ratios in diffraction experiments, and how they can protect crystals from modifications in the sample environment is discussed.

i4.0, 3D printing, deglobalisation and new manufacturing clusters: The view from Australia

2020 ◽  
pp. 103530462098142
Author(s):  
Al Rainnie
Keyword(s):  
Manufacturing Industry ◽  
New Technologies ◽  
Manufacturing Sector ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Jel Code ◽  
The One ◽  
The Impact ◽  
Dimensional Printing ◽  
Work And Employment

Before the COVID-19 pandemic erupted onto the world stage, a new narrative was apparently beginning to emerge about the impact of i4.0 and new technologies in general, and three-dimensional printing in particular, on the future of work and employment. This was to have particular geographical implications for the manufacturing sector in particular. Proponents of i4.0 also suggested that this process, particularly in manufacturing, would promote the re-emergence of patterns of clustering. Developments in advanced manufacturing, particularly three-dimensional printing, would accelerate and reinforce these tendencies. This article looks at the role that three-dimensional printing is supposed to play in the new world, and in particular, critically evaluates its role in reinforcing the trend towards deglobalisation on the one hand, and, on the other, new clusters of manufacturing industry. JEL code: O33

scholarly journals Professional Mobility and “Objective” and “Subjective” Satisfaction. a Non- Linear Analysis from the Theory of the Three-Dimensional Spiral of Sense in Population of Doctors

2016 ◽  
Vol 2 (4) ◽  
pp. 52
Author(s):  
Miriam Aparicio
Keyword(s):  
Social Representations ◽  
Three Dimensional ◽  
Professional Status ◽  
Structural Factors ◽  
Professional Careers ◽  
Professional Mobility ◽  
National University ◽  
Micro Level ◽  
The One ◽  
The Impact

This work goes along the lines of the author’s research (1995-2016) on professional careers and models bearing causes and effects regarding sustained interaction (core, psychosocial, institutional and structural factors). The aim of this paper was analyze, through the doctors’ social representations, the levels of satisfaction evidenced by those who have advanced professionally to the highest positions within the scientific (or other) system. The hypothesis states that the relation is not linear but inverse. Satisfaction would not increase according to the Professional Status. We consider here, on the one hand, the insufficient Professionalization and the increasing demands from the market; and on the other, the impact structural limits have on the micro level. The methodology used was quanti-qualitative (semi-structured questionnaires, interviews, and hierarchical evocations). The population consisted of doctors (2005-2012) from the National University of Cuyo, in Argentina and the Cnam (France) of different courses of study. The results confirm the hypothesis. As regards what was observed among those who advanced professionally, the increase on the growing market demands along with the lack of institutionalized means in order to reach goals, result in lower satisfaction. This is interpreted from the theory of the author, which involves 3 levels (macro-meso-micro-macro) (Aparicio, 2015 a, b). We also consider the theories of anomie and of the expectancy of valence (Feather - Davenport). Findings along this line were also seen in studies with scientists (Aparicio, 2014). The results propose a revision in the prevailing working conditions and police: satisfaction acts on subsystems and consolidates them.

Sign in / Sign up

Export Citation Format

Share Document