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1
Saha, Rony Kumer, et Chaodit Aswakul. « Incentive and Architecture of Multi-Band Enabled Small Cell and UE for Up-/Down-Link and Control-/User-Plane Splitting for 5G Mobile Networks ». Frequenz 71, no 1-2 (1 janvier 2017) : 95–118. http://dx.doi.org/10.1515/freq-2016-0014.
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Abstract In this paper, a multi-band enabled femtocell base station (FCBS) and user equipment (UE) architecture is proposed in a multi-tier network that consists of small cells, including femtocells and picocells deployed over the coverage of a macrocell for splitting uplink and downlink (UL/DL) as well as control-plane and user-plane (C-/U-plane) for 5G mobile networks. Since splitting is performed at the same FCBS, we define this architecture as the same base station based split architecture (SBSA). For multiple bands, we consider co-channel (CC) microwave and different frequency (DF) 60 GHz millimeter wave (mmWave) bands for FCBSs and UEs with respect to the microwave band used by their over-laid macrocell base station. All femtocells are assumed to be deployed in a 3-dimensional multi-storage building. For CC microwave band, cross-tier CC interference of femtocells with macrocell is avoided using almost blank subframe based enhanced inter-cell interference coordination techniques. The co-existence of CC microwave and DF mmWave bands for SBSA on the same FCBS and UE is first studied to show their performance disparities in terms of system capacity and spectral efficiency in order to provide incentives for employing multiple bands at the same FCBS and UE and identify a suitable band for routing decoupled UL/DL or C-/U-plane traffic. We then present a number of disruptive architectural design alternatives of multi-band enabled SBSA for 5G mobile networks for UL/DL and C-/U-plane splitting, including a disruptive and complete splitting of UL/DL and C-/U-plane as well as a combined UL/DL and C-/U-plane splitting, by exploiting dual connectivity on CC microwave and DF mmWave bands. The outperformances of SBSA in terms of system level capacity, average spectral efficiency, energy efficiency, and control-plane overhead traffic capacity in comparison with different base stations based split architecture (DBSA) are shown. Finally, a number of technical and business perspectives as well as key research issues of SBSA are discussed.
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Nasouri, Komeil, et Ahmad Mousavi Shoushtari. « Fabrication of magnetite nanoparticles/polyvinylpyrrolidone composite nanofibers and their application as electromagnetic interference shielding material ». Journal of Thermoplastic Composite Materials 31, no 4 (25 avril 2017) : 431–46. http://dx.doi.org/10.1177/0892705717704488.
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Magnetite (Fe3O4) nanoparticles/polyvinylpyrrolidone (PVP) composite nanofibers (FCNFs) have been fabricated to evaluate the potential of FCNFs as electromagnetic interference (EMI) shielding material in the frequency range of 8.2–12.4 GHz. The scanning electron microscope and viscosity analyses confirmed the presence of good dispersion Fe3O4 nanoparticles encapsulated within the electrospun nanofibers and showed FCNF morphologies with diameters of 150–500 nm. The magnetic properties and electrical conductivity of FCNFs were found to be dependent on Fe3O4 nanoparticles concentration and showed an increase with increasing Fe3O4 nanoparticles loading. The EMI shielding efficiency of FCNFs increased up to approximately 22 dB. The EMI shielding results for FCNFs showed that absorption was the major shielding mechanism and reflection was the secondary shielding mechanism. The present study has shown the possibility of utilizing magnetic FCNFs as EMI shielding/absorption materials.
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Feng, Yadong, Chunhua Jiao, Yang Cao, Ye Zhao, Yanfang Chen, Lin Fang et Ruihua Shi. « A Comparison of a Fully Covered and an Uncovered Segmented Biodegradable Esophageal Stent in a Porcine Model : Preclinical Evaluation of Degradation, Complications, and Tissue Reactions ». Gastroenterology Research and Practice 2016 (2016) : 1–7. http://dx.doi.org/10.1155/2016/8690858.
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Aims. This study was to compare the degradation, complications, and tissue reactions of two segmented biodegradable esophageal stents in a porcine model.Methods. Uncovered biodegradable segmented stents and fully covered biodegradable segmented stents (FCBDS) were transplanted into the porcine esophagus lumen. Data on biodegradation, complications, and tissue reactions were collected and compared.Results. All animals kept good general conditions. No severe complications and stents migration occurred. Stents degradation commenced at week 3. Compared with uncovered stents, stents structure breakage and complete stents absorption in FCBDS were postponed for 1-2 weeks. Hyperplasia was prominent at early stage and ameliorated at late stage after stents insertion. Tissue reactions in FCBDS were milder than those in uncovered stents in the early stage. A longer degradation period was present in FCBDS than in uncovered stents, while FCBDS induced tissue reaction at late stage was mild.Conclusions. Biodegradable esophageal stents with a segmented trunk may be further evaluated in refractory benign esophagus strictures. This FCBDS may be advantageous compared with uncovered stents for a longer degradation period.
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Xue, Hai, Kyung Tae Kim et Hee Yong Youn. « Packet Scheduling for Multiple-Switch Software-Defined Networking in Edge Computing Environment ». Wireless Communications and Mobile Computing 2018 (18 novembre 2018) : 1–11. http://dx.doi.org/10.1155/2018/7659085.
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Software-defined networking (SDN) decouples the control plane and data forwarding plane to overcome the limitations of traditional networking infrastructure. Among several communication protocols employed for SDN, OpenFlow is most widely used for the communication between the controller and switch. In this paper two packet scheduling schemes, FCFS-Pushout (FCFS-PO) and FCFS-Pushout-Priority (FCFS-PO-P), are proposed to effectively handle the overload issue of multiple-switch SDN targeting the edge computing environment. Analytical models on their operations are developed, and extensive experiment based on a testbed is carried out to evaluate the schemes. They reveal that both of them are better than the typical FCFS-Block (FCFS-BL) scheduling algorithm in terms of packet wait time. Furthermore, FCFS-PO-P is found to be more effective than FCFS-PO in the edge computing environment.
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Grosof, Isaac, Kunhe Yang, Ziv Scully et Mor Harchol-Balter. « Nudge : Stochastically Improving upon FCFS ». Proceedings of the ACM on Measurement and Analysis of Computing Systems 5, no 2 (juin 2021) : 1–29. http://dx.doi.org/10.1145/3460088.
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The First-Come First-Served (FCFS) scheduling policy is the most popular scheduling algorithm used in practice. Furthermore, its usage is theoretically validated: for light-tailed job size distributions, FCFS has weakly optimal asymptotic tail of response time. But what if we don't just care about the asymptotic tail? What if we also care about the 99th percentile of response time, or the fraction of jobs that complete in under one second? Is FCFS still best? Outside of the asymptotic regime, only loose bounds on the tail of FCFS are known, and optimality is completely open. In this paper, we introduce a new policy, Nudge, which is the first policy to provably stochastically improve upon FCFS. We prove that Nudge simultaneously improves upon FCFS at every point along the tail, for light-tailed job size distributions. As a result, Nudge outperforms FCFS for every moment and every percentile of response time. Moreover, Nudge provides a multiplicative improvement over FCFS in the asymptotic tail. This resolves a long-standing open problem by showing that, counter to previous conjecture, FCFS is not strongly asymptotically optimal.
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Grosof, Isaac, Kunhe Yang, Ziv Scully et Mor Harchol-Balter. « Nudge : Stochastically Improving upon FCFS ». ACM SIGMETRICS Performance Evaluation Review 49, no 1 (22 juin 2022) : 11–12. http://dx.doi.org/10.1145/3543516.3460102.
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The First-Come First-Served (FCFS) scheduling policy is the most popular scheduling algorithm used in practice. Furthermore, its usage is theoretically validated: for light-tailed job size distributions, FCFS has weakly optimal asymptotic tail of response time. But what if we don't just care about the asymptotic tail? What if we also care about the 99th percentile of response time, or the fraction of jobs that complete in under one second? Is FCFS still best? Outside of the asymptotic regime, only loose bounds on the tail of FCFS are known, and optimality is completely open. In this paper, we introduce a new policy, Nudge, which is the first policy to provably stochastically improve upon FCFS. We prove that Nudge simultaneously improves upon FCFS at every point along the tail, for light-tailed job size distributions. As a result, Nudge outperforms FCFS for every moment and every percentile of response time. Moreover, Nudge provides a multiplicative improvement over FCFS in the asymptotic tail. This resolves a long-standing open problem by showing that, counter to previous conjecture, FCFS is not strongly asymptotically optimal. This paper represents an abridged version of [2].
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Qi, Ke, Yamin Dang, Changhui Xu et Shouzhou Gu. « Performance Analysis of BDS-3 FCB Estimated by Reference Station Networks over a Long Time ». Mathematics 10, no 19 (2 octobre 2022) : 3610. http://dx.doi.org/10.3390/math10193610.
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The stability and validity of the BDS-3 precise point positioning ambiguity solution (PPP-AR) is becoming more and more important along with the development of BDS-3 orbit and clock products over long durations. Satellite phase fractional cycle biases (FCBs) are key in PPP-AR, so it is important to ensure the validity and stability of FCBs over a long duration. In this study, we analyzed the validity and stability of BDS-3 phase FCBs by estimating them. The BDS-3 FCB experiments showed that BDS-3 FCBs have the same stability as GPS/GAL/BDS-2. BDS-3 widelane (WL) FCBs also have stable characteristics and the maximal fluctuation value of WL FCBs was found to be 0.2 cycles in a month. BDS-3 narrowlane (NL) FCBs were found to be unstable and the maximal fluctuation value of NL FCBs was more than 0.25 cycles over one day. Analyzing the posteriori residual errors of BDS-3 WL and NL ambiguities showed that the BDS-3 FCBs had the same accuracy as GPS/GAL/BDS-2. However, the ambiguity-fixed rate of BDS-3 was about 70%, which was less than GPS/GAL/BDS-2 in PPP-AR experiments. For this reason, we analyzed the quality of data and the accuracy of orbit and clock products by using different analysis center products. The results showed that the low accuracy of the BDS-3 orbit and clock products was the main reason for the low-ambiguity fixed rate.
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Hoopes, David G., et Danny Miller. « Ownership Preferences, Competitive Heterogeneity, and Family-Controlled Businesses ». Family Business Review 19, no 2 (juin 2006) : 89–101. http://dx.doi.org/10.1111/j.1741-6248.2006.00064.x.
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This article models ownership concentration, owner preferences, and competitive advantage. It argues that ownership structure and owner preferences can give rise to resources and capabilities that increase firm profits. The model is then used to explain how successful family-controlled businesses (FCBs) differ from firms with less concentrated ownership and less successful FCBs. Because of their ownership concentration and reduced monitoring costs, many FCBs will have a resource surplus. That surplus and the tendency toward long-term investment among some FCBs create unique competitive opportunities under conditions we specify.
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Rasool, Saman, et Ritika Gakher. « Reformed FCFS Disk Scheduling Algorithm ». International Journal of Computer Applications 127, no 13 (15 octobre 2015) : 38–41. http://dx.doi.org/10.5120/ijca2015906592.
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Lee, Chun-Yao, et Wen-Cheng Lin. « Induction Motor Fault Classification Based on FCBF-PSO Feature Selection Method ». Applied Sciences 10, no 15 (4 août 2020) : 5383. http://dx.doi.org/10.3390/app10155383.
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This study proposes a fast correlation-based filter with particle-swarm optimization method. In FCBF–PSO, the weights of the features selected by the fast correlation-based filter are optimized and combined with backpropagation neural network as a classifier to identify the faults of induction motors. Three significant parts were applied to support the FCBF–PSO. First, Hilbert–Huang transforms were used to analyze the current signals of motor normal, bearing damage, broken rotor bars and short circuits in stator windings. Second, ReliefF, symmetrical uncertainty and FCBF three feature-selection methods were applied to select the important features after the feature was captured. Moreover, the accuracy comparison was performed. Third, particle-swarm optimization (PSO) was combined to optimize the selected feature weights which were used to obtain the best solution. The results showed excellent performance of the FCBF–PSO for the induction motor fault classification such as had fewer feature numbers and better identification ability. In addition, the analyzed of the induction motor fault in this study was applied with the different operating environments, namely, SNR = 40 dB, SNR = 30 dB and SNR = 20 dB. The FCBF–PSO proposed by this research could also get the higher accuracy than typical feature-selection methods of ReliefF, SU and FCBF.
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Lu, Qilin, Jiayin Wu, Hanchen Wang et Biao Huang. « One-Pot Green Preparation of Fluorescent Cellulose Nanofibers ». Polymers 14, no 7 (24 mars 2022) : 1313. http://dx.doi.org/10.3390/polym14071313.
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Fluorescent cellulose nanofibers (FCNFs), with a high yield, were prepared via one-pot hydrolysis and the grafting reaction of cellulose with thiazolipyridine carboxylic acid (TPCA). The hydrolysis and Fischer esterification of cellulose were conducted under microwave-hydrothermal conditions; meanwhile, TPCA formation was induced by the dehydration reaction between L-cysteine and citric acid. The effects of the reaction temperature and reaction time on the yield and performance of FCNF were investigated. The morphology and size, surface chemical property, crystal structure, thermostability, and fluorescent performance of FCNF were characterized. The results revealed that the yield of FCNF reached 73.2% under a microwave power of 500 W, reaction temperature of 110 °C, and reaction time of 5 h. The FCNF obtained presents a short rod-like morphology. The crystallinity of the FCNFs is 80%, and their thermal stability did not decline significantly. Additionally, the fluorescent performance of the FCNFs is excellent, which results in them having good sensitivity to chloride ions. The good fluorescent performance and significant responsiveness to chloride ions of FCNFs lead to them having broad prospects in bio-labeling, biosensing, information storage, chloride ion detection, among others.
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Qu, Lizhong, Pu Zhang, Changfeng Jing, Mingyi Du, Jian Wang, Qile Zhao et Juanjuan Li. « Estimating the Fractional Cycle Biases for GPS Triple-Frequency Precise Point Positioning with Ambiguity Resolution Based on IGS Ultra-Rapid Predicted Orbits ». Remote Sensing 13, no 16 (10 août 2021) : 3164. http://dx.doi.org/10.3390/rs13163164.
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We investigate the estimation of the fractional cycle biases (FCBs) for GPS triple-frequency uncombined precise point positioning (PPP) with ambiguity resolution (AR) based on the IGS ultra-rapid predicted (IGU) orbits. The impact of the IGU orbit errors on the performance of GPS triple-frequency PPP AR is also assessed. The extra-wide-lane (EWL), wide-lane (WL) and narrow-lane (NL) FCBs are generated with the single difference (SD) between satellites model using the global reference stations based on the IGU orbits. For comparison purposes, the EWL, WL and NL FCBs based on the IGS final precise (IGF) orbits are estimated. Each of the EWL, WL and NL FCBs based on IGF and IGU orbits are converted to the uncombined FCBs to implement the static and kinematic triple-frequency PPP AR. Due to the short wavelengths of NL ambiguities, the IGU orbit errors significantly impact the precision and stability of NL FCBs. An average STD of 0.033 cycles is achieved for the NL FCBs based on IGF orbits, while the value of the NL FCBs based on IGU orbits is 0.133 cycles. In contrast, the EWL and WL FCBs generated based on IGU orbits have comparable precision and stability to those generated based on IGF orbits. The use of IGU orbits results in an increased time-to-first-fix (TTFF) and lower fixing rates compared to the use of IGF orbits. Average TTFFs of 23.3 min (static) and 31.1 min (kinematic) and fixing rates of 98.1% (static) and 97.4% (kinematic) are achieved for the triple-frequency PPP AR based on IGF orbits. The average TTFFs increase to 27.0 min (static) and 37.9 min (kinematic) with fixing rates of 97.0% (static) and 96.3% (kinematic) based on the IGU orbits. The convergence times and positioning accuracy of PPP and PPP AR based on IGU orbits are slightly worse than those based on IGF orbits. Additionally, limited by the number of satellites transmitting three frequency signals, the introduction of the third frequency, L5, has a marginal impact on the performance of PPP and PPP AR. The GPS triple-frequency PPP AR performance is expected to improve with the deployment of new-generation satellites capable of transmitting the L5 signal.
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Duan, Hongyu, Xiaojun Yao, Dahong Zhang, Huian Jin et Qixin Wei. « Long-Term Temporal and Spatial Monitoring of Cladophora Blooms in Qinghai Lake Based on Multi-Source Remote Sensing Images ». Remote Sensing 14, no 4 (11 février 2022) : 853. http://dx.doi.org/10.3390/rs14040853.
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With climate warming and intensification of human activities, the eco-environmental problems of lakes in middle and high latitudes become increasingly prominent. Qinghai Lake, located in the northeastern of the Tibetan Plateau, is the largest inland saltwater lake in China. Recently, the problem of Cladophora blooms has been widely concerning. In this study, the area of floating Cladophora blooms (hereafter FCBs) in Qinghai Lake from 1986 to 2021 was extracted using Floating Algal Index (FAI) method based on Landsat TM/ETM+/OLI and Sentinel-2 MSI images, and then the intra- and inter-annual variation characteristics and spatial patterns of FCBs were analyzed. The results show that the general change trend of FCBs in Qinghai Lake featured starting in May, expanding rapidly from June to August, and increasing steadily from September to October. From 1986 to 2021, the area of FCBs in Qinghai Lake showed an overall increasing trend in all months, with the largest increase in July at 0.1 km2/a, followed by October at 0.096 km2/a. Spatially speaking, the FCBs area showed a significant increasing trend in the northern Buha River estuary (BRN) and southern Buha River estuary (BRS) regions, a slight increase in the Shaliu River estuary (SR) region, and a decreasing trend in the Quanji River estuary (QR) region and the Heima River estuary (HR) region. The correlation between the meteorological factors and the changes in FCBs was weak, but the increase in flooded pastures in the BRN region (Bird Island) due to rising water levels was definitely responsible for the large-scale increase in FCBs in this region. However, the QB, northeastern bay of Shaliu River estuary (SRB) and HR regions, which also have extensive inundated grassland, did not have the same increase in FCBs area, suggesting that the growth of Cladophora is caused by multiple factors. The complex relationships need to be verified by further research. The current control measures have a certain inhibitory effect on the Cladophora bloom in Qinghai Lake because the FCBs area was significantly smaller in 2017–2020 (5.22 km2, 3.32 km2, 4.55 km2 and 2.49 km2), when salvage work was performed, than in 2016 and 2021 (8.67 km2 and 9.14 km2), when no salvage work was performed.
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Braun, Michael, et Anurag Sharma. « Should the CEO Also Be Chair of the Board ? An Empirical Examination of Family-Controlled Public Firms ». Family Business Review 20, no 2 (juin 2007) : 111–26. http://dx.doi.org/10.1111/j.1741-6248.2007.00090.x.
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Using the competing agency theoretic and stewardship theory perspectives, we empirically examine the relationship between CEO duality and firm performance in family-controlled public firms (FCPFs). We find that duality by itself does not influence firm performance in FCPFs. However, our results show that the relationship between duality and performance is contingent on the family's ownership stake in the firm. In nondual firms, performance is inversely related to family ownership level. Dual FCPFs do not exhibit any changes in performance dependent on family ownership levels. Our findings reveal, in short, that when family ownership is low, the separation of CEO and board chair roles is beneficial in terms of shareholder returns. Having different persons occupy the CEO and board chair positions is a useful governance control as the risk of family entrenchment increases.
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Petrovic, Srdjan. « Space-efficient FCFS group mutual exclusion ». Information Processing Letters 95, no 2 (juillet 2005) : 343–50. http://dx.doi.org/10.1016/j.ipl.2005.04.009.
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Jiang, Weiping, Wen Zhao, Hua Chen, Xuexi Liu, Xiangdong An et Qusen Chen. « Analysis of BDS Fractional Cycle Biases and PPP Ambiguity Resolution ». Sensors 19, no 21 (31 octobre 2019) : 4725. http://dx.doi.org/10.3390/s19214725.
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It is difficult to enable traditional precise point positioning (PPP) with ambiguity resolution (AR) due to fractional cycle biases (FCBs), which limit the accuracy and reliability of positioning results. The BeiDou Navigation Satellite System (BDS) has been providing continuous positioning, navigation, and timing (PNT) services in the global region since the end of 2018. The BDS constellation includes geostationary earth orbit (GEO), inclined geostationary orbit (IGSO), and medium earth orbit (MEO) satellites. However, its hybrid constellation structure and the satellite-side multipath effect have hindered the BDS PPP AR for two main reasons: (1) some receivers have half-cycle biases between GEO and non-GEO satellites, which result in the inconsistency of hardware delays for each satellite type; (2) the correction model for elevation-dependent satellite-side multipath effect is only applicable to IGSO and MEO, while in the case of GEO the effect cannot be effectively weakened or eliminated. To rectify these problems, a suitable strategy is proposed for estimating BDS FCBs, whereby the GEO FCBs and non-GEO FCBs are estimated independently. Results show that the FCBs estimated by the new strategy for GEO and non-GEO are more stable compared to the traditional strategy. The GEO wide-lane (WL) FCBs fluctuate less than 0.3 cycle in one month, except for C05, while the variation of non-GEO WL FCBs is about 0.1 cycle. In addition, compared to the traditional strategy, the fractions of GEO WL ambiguities after the removal of FCBs estimated by the new strategy can be improved noticeably from 53.5% to 78.5%, and from 71.8% to 92.3% for <0.15 cycle and <0.25 cycle respectively, which could be comparable with non-GEO. Simultaneously, the improvement of GEO narrow-lane (NL) ambiguities is from 28.9% to 40.2%, and from 40.4% to 53.3% for <0.10 cycle and <0.15 cycle respectively, are less noticeable. This is mainly due to the low precision IGS products for GEO. After PPP AR, the mean convergence time is shorted from 56.0 min to 43.6 min, and from 71.6 min to 62.7 min for static PPP and kinematic PPP, respectively.
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Wu, Yuanyuan, et Feng Zhu. « Junction Management for Connected and Automated Vehicles : Intersection or Roundabout ? » Sustainability 13, no 16 (23 août 2021) : 9482. http://dx.doi.org/10.3390/su13169482.
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The concept of signal-free management at road junctions is tailored for Connected and Automated Vehicles (CAVs), in which the conventional signal control is replaced by various right-of-way assignment policies. First-Come-First-Served (FCFS) is the most commonly used policy. In most proposed strategies, although the traffic signals are replaced, the organization of vehicle trajectory remains the same as that of traffic lights. As a naturally signal-free strategy, roundabout has not received enough attention. A key motivation of this study is to theoretically compare the performance of signalized intersection (I-Signal), intersection using FCFS policy (I-FCFS), roundabout using the typical major-minor priority pattern (R-MM), and roundabout adopting FCFS policy (R-FCFS) under pure CAVs environment. Queueing theory is applied to derive the theoretical formulas of the capacity and average delay of each strategy. M/G/1 model is used to model the three signal-free strategies, while M/M/1/setup model is used to capture the red-and-green light switch nature of signal control. The critical safety time gaps are the main variables and are assumed to be generally distributed in the theoretical derivation. Analytically, I-Signal has the largest capacity benefiting from the ability to separate conflict points in groups, but in some cases it will have higher delay. Among the other three signal-free strategies, R-FCFS has the highest capacity and the least average control delay, indicating that the optimization of signal-free management of CAVs based on roundabout setting is worthy of further study.
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Li, Qiao, et Xiao Ming Tao. « Three-dimensionally deformable, highly stretchable, permeable, durable and washable fabric circuit boards ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 470, no 2171 (8 novembre 2014) : 20140472. http://dx.doi.org/10.1098/rspa.2014.0472.
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This paper reports fabric circuit boards (FCBs), a new type of circuit boards, that are three-dimensionally deformable, highly stretchable, durable and washable ideally for wearable electronic applications. Fabricated by using computerized knitting technologies at ambient dry conditions, the resultant knitted FCBs exhibit outstanding electrical stability with less than 1% relative resistance change up to 300% strain in unidirectional tensile test or 150% membrane strain in three-dimensional ball punch test, extraordinary fatigue life of more than 1 000 000 loading cycles at 20% maximum strain, and satisfactory washing capability up to 30 times. To the best of our knowledge, the performance of new FCBs has far exceeded those of previously reported metal-coated elastomeric films or other organic materials in terms of changes in electrical resistance, stretchability, fatigue life and washing capability as well as permeability. Theoretical analysis and numerical simulation illustrate that the structural conversion of knitted fabrics is attributed to the effective mitigation of strain in the conductive metal fibres, hence the outstanding mechanical and electrical properties. Those distinctive features make the FCBs particularly suitable for next-to-skin electronic devices. This paper has further demonstrated the application potential of the knitted FCBs in smart protective apparel for in situ measurement during ballistic impact.
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Uzdenov, T. A. « Reduction of Task Queue Execution Time in GRID-systems with Inalienable Resources ». Èlektronnoe modelirovanie 43, no 2 (6 avril 2021) : 86–96. http://dx.doi.org/10.15407/emodel.43.02.086.
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Наведено математичну постановку задачі диспетчеризації потоків завдань в GRID-системах з невідчужуваними ресурсами з врахуванням потужності вузла та потужності задачі як ключових факторів, що впливають на продуктивність системи. Проведено порівняння часу виконання черги завдань при розподілі методами FSA (Flow Scheduling Algorithm), FSA_P(Flow Scheduling Algorithm Parallel) та FCFS(First Come First Serve). Описано клієнт-серверну архітектурну модель побудови програмного забезпечення для розподілених обчислень та задач, які потребують великої обчислювальної потужності системи. Обґрунтовано доцільність порівняння ефективності запропонованих методів з загальновідомим методом FCFS, який зазвичай використовується у GRID-системах. Подано результати тестування, яке засвідчило, що запропоновані методи дають кращий результат, ніж FCFS.
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Salvato, Carlo, et Leif Melin. « Creating Value Across Generations in Family-Controlled Businesses : The Role of Family Social Capital ». Family Business Review 21, no 3 (septembre 2008) : 259–76. http://dx.doi.org/10.1177/08944865080210030107.
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This article explores the processes through which family-controlled businesses (FCBs) access and recombine resources to match the evolving needs of their business activities. We do so by applying the conceptual lens offered by social capital to the comparative study of four FCBs active in traditional competitive arenas. Our data reveal that these firms' ability to create financial value over generations does not result from possession of some unique resource, nor from higher-level combinative capabilities; rather, these FCBs have systematically created value through their ability to renew and to reshape their social interactions within and outside the controlling family.
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Gu, Jingwang, Zengjun Xiao, Chunting Yu, Qiang Zhang, Yang Chen et Dongfeng Zhao. « High resolution laser excitation spectra and Franck-Condon factors of A2Π−X2Σ+ electronic transition of MgF ». Chinese Journal of Chemical Physics 35, no 1 (février 2022) : 58–68. http://dx.doi.org/10.1063/1674-0068/cjcp2109151.
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Magnesium monofluoride (MgF) is proposed as an ideal candidate radical for direct laser cooling. Here, the rotationally resolved laser spectra of MgF for the A2Π− X2Σ+ electronic transition system were recorded by using laser induced fluorescence technique. The MgF radicals were produced by discharging SF6/Ar gas mixtures between the tips of two magnesium needles in a supersonic jet expansion. We recorded a total of 19 vibrational bands belonging to three sequences of Δ v=0, ±1 in the region of 348-370 nm. Accurate spectroscopic constants for both X2Σ+ and A2Π states are determined from rotational analysis of the experimental spectra. Spectroscopic parameters, including the Franck-Condon factors (FCFs), are determined from the experimental results and the Rydberg-Klein-Rees (RKR) calculations. Significant discrepancies between the experimentally measured and RKR-calculated FCFs are found, indicating that the FCFs are nearly independent of the spin-orbit coupling in the A2Π state. Potential energy curves (PECs) and FCFs determined here provide necessary data for the theoretical simulation of the laser-cooling scheme of MgF.
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Yao, Yi-Ching. « A Duality Relation Between the Workload and Attained Waiting Time in FCFS G/G/s Queues ». Journal of Applied Probability 50, no 1 (mars 2013) : 300–307. http://dx.doi.org/10.1239/jap/1363784441.
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Sengupta (1989) showed that, for the first-come–first-served (FCFS) G/G/1 queue, the workload and attained waiting time of a customer in service have the same stationary distribution. Sakasegawa and Wolff (1990) derived a sample path version of this result, showing that the empirical distribution of the workload values over a busy period of a given sample path is identical to that of the attained waiting time values over the same period. For a given sample path of an FCFS G/G/s queue, we construct a dual sample path of a dual queue which is FCFS G/G/s in reverse time. It is shown that the workload process on the original sample path is identical to the total attained waiting time process on the dual sample path. As an application of this duality relation, we show that, for a time-stationary FCFS M/M/s/k queue, the workload process is equal in distribution to the time-reversed total attained waiting time process.
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Yao, Yi-Ching. « A Duality Relation Between the Workload and Attained Waiting Time in FCFS G/G/s Queues ». Journal of Applied Probability 50, no 01 (mars 2013) : 300–307. http://dx.doi.org/10.1017/s0021900200013280.
Texte intégralRésumé :
Sengupta (1989) showed that, for the first-come–first-served (FCFS) G/G/1 queue, the workload and attained waiting time of a customer in service have the same stationary distribution. Sakasegawa and Wolff (1990) derived a sample path version of this result, showing that the empirical distribution of the workload values over a busy period of a given sample path is identical to that of the attained waiting time values over the same period. For a given sample path of an FCFS G/G/s queue, we construct a dual sample path of a dual queue which is FCFS G/G/s in reverse time. It is shown that the workload process on the original sample path is identical to the total attained waiting time process on the dual sample path. As an application of this duality relation, we show that, for a time-stationary FCFS M/M/s/k queue, the workload process is equal in distribution to the time-reversed total attained waiting time process.
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Farida, Yuniar, Nurissaidah Ulinnuha, Silvia Kartika Sari et Latifatun Nadya Desinaini. « Comparing Support Vector Machine and Naïve Bayes Methods with A Selection of Fast Correlation Based Filter Features in Detecting Parkinson's Disease ». Lontar Komputer : Jurnal Ilmiah Teknologi Informasi 14, no 2 (4 novembre 2023) : 80. http://dx.doi.org/10.24843/lkjiti.2023.v14.i02.p02.
Texte intégralRésumé :
Dopamine levels fall due to brain nerve cell destruction, producing Parkinson's symptoms. Humans with this illness experience central nervous system damage, which lowers the quality of life. This disease is not deadly, but when people's quality of life decreases, they cannot perform daily activities as people do. Even in one case, this disease can cause death indirectly. Contrast support vector machines (SVM) and naive Bayesian approaches with and without fast correlation-based filter (FCBF) feature selection, this study attempts to determine the optimum model to detect Parkinson's disease categorization. In this study, datasets from the UCI Machine Learning Repository are used. The results showed that SVM with FCBF achieved the highest accuracy among all the models tested. SVM with FCBF provides an accuracy of 86.1538%, sensitivity of 93.8775%, and specificity of 62.5000%. Both methods, SVM and Naive Bayes, have improved in performance due to FCBF, with SVM showing a more significant increase in accuracy. This research contributed to helping paramedics determine if a patient has Parkinson's disease or not using characteristics obtained from data, such as movement, sound, or other pertinent factors.
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Bai, Xiaotian, Zhaonan Zhang, Huaitao Shi, Zhong Luo et Tao Li. « Identification of Subsurface Mesoscale Crack in Full Ceramic Ball Bearings Based on Strain Energy Theory ». Applied Sciences 13, no 13 (30 juin 2023) : 7783. http://dx.doi.org/10.3390/app13137783.
Texte intégralRésumé :
Subsurface mesoscale cracks exist widely in the outer ring of full ceramic ball bearings (FCBBs), which is a potential threat for the stable operation of related devices such as aero engines, food processing machinery, and artificial replacement hip joints. This paper establishes a dynamic model of subsurface mesoscale cracks in the outer ring of FCBBs based on strain energy theory, and the influence of different crack lengths on the running state is analyzed. The existence of mesoscale cracks is regarded as weakening on the stiffness coefficient, and the deterioration degree of outer ring stiffness of subsurface cracks is thereby quantified. It is found that a small wave peak appears in the vibration time-domain signal when there is a mesoscale crack on the outer ring subsurface, and the crack evolution is evaluated by the amplitude of the corresponding feature frequency. Finally, the accuracy of the model is verified by experiments. The model realizes the identification and degree evaluation of subsurface mesoscale cracks in FCBBs, and provides theoretical references for the diagnosis and status monitoring for FCBB rotor systems.
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Al-Sharif, M. S., A. I. Ahmed et M. S. Salim. « An Integral Operational Matrix of Fractional-Order Chelyshkov Functions and Its Applications ». Symmetry 12, no 11 (23 octobre 2020) : 1755. http://dx.doi.org/10.3390/sym12111755.
Texte intégralRésumé :
Fractional differential equations have been applied to model physical and engineering processes in many fields of science and engineering. This paper adopts the fractional-order Chelyshkov functions (FCHFs) for solving the fractional differential equations. The operational matrices of fractional integral and product for FCHFs are derived. These matrices, together with the spectral collocation method, are used to reduce the fractional differential equation into a system of algebraic equations. The error estimation of the presented method is also studied. Furthermore, numerical examples and comparison with existing results are given to demonstrate the accuracy and applicability of the presented method.
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Adan, Ivo, Igor Kleiner, Rhonda Righter et Gideon Weiss. « FCFS parallel service systems and matching models ». Performance Evaluation 127-128 (novembre 2018) : 253–72. http://dx.doi.org/10.1016/j.peva.2018.10.005.
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Ghassami, AmirEmad, et Negar Kiyavash. « A Covert Queueing Channel in FCFS Schedulers ». IEEE Transactions on Information Forensics and Security 13, no 6 (juin 2018) : 1551–63. http://dx.doi.org/10.1109/tifs.2018.2797953.
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KumarMishra, Manish. « An Improved FCFS (IFCFS) Disk Scheduling Algorithm ». International Journal of Computer Applications 47, no 13 (30 juin 2012) : 20–24. http://dx.doi.org/10.5120/7248-0298.
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Mubashir, Asim, et Danish Ahmed Siddiqui. « Work Engagement at the Corporate Crossroads : The Role of Followers' Conflict Behaviors, Mediated by LMX, TMX, and Transformational Leadership, with Prosocial Motivation as a Moderator, in Pakistan's Workforce Dynamics ». Journal of Social & ; Organizational Matters 2, no 2 (30 septembre 2023) : 01–42. http://dx.doi.org/10.56976/jsom.v2i2.24.
Texte intégralRésumé :
This research explores the complex dynamics between follower conflict behaviors (FCBs) and work engagement (WE) within the private sector of Pakistan. It delves into different types of conflict behaviors, including Problem-Solving Behaviors (PSB), Dominating Conflict Behaviors (DCB), and Non-Confronting Conflict Behaviors (NCB). A key focus of the study is to analyze how Transformational Leadership (TL), Leader-Member Exchange (LMX), and Team-Member Exchange (TMX) mediate these relationships, particularly in the context of work engagement. Furthermore, it investigates the moderating influence of Prosocial Motivation (PSM) on the interplay between FCBs (PSB, DCB, and NCB) and Work Engagement (WE). Utilizing Smart PLS 3.0 for its structural equation modeling, the study gathers data from 395 respondents to shed light on the direct, mediated, and moderated relationships involving FCBs and WE. Findings indicate a positive association between PSB and WE, whereas both DCB and NCB are shown to adversely affect WE. The study identifies TL as a significant mediator in the PSB-WE linkage, with LMX mediating the relationship across all forms of FCBs. Additionally, TMX is particularly influential in mediating the PSB-WE connection. In the context of moderation, PSM emerges as a pivotal element, shaping the dynamics between FCBs and WE. These insights are crucial for comprehending the intricate interactions of conflict behaviors, leadership styles, and engagement within Pakistani organizations. The study underscores the importance of further research in diverse cultural settings using various methodologies. It contributes significantly to the understanding of how conflict behaviors, leadership approaches, and motivational factors impact work engagement, offering critical guidance for enhancing employee engagement in multicultural contexts.
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Torlakovic, Emina, et Goran Torlakovic. « Follicular Colonization by Follicular Lymphoma ». Archives of Pathology & ; Laboratory Medicine 126, no 9 (1 septembre 2002) : 1136–37. http://dx.doi.org/10.5858/2002-126-1136-fcbfl.
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Zappe, Anne C., Josef Pfeuffer, Hellmut Merkle, Nikos K. Logothetis et Jozien BM Goense. « The Effect of Labeling Parameters on Perfusion-Based fMRI in Nonhuman Primates ». Journal of Cerebral Blood Flow & ; Metabolism 28, no 3 (24 octobre 2007) : 640–52. http://dx.doi.org/10.1038/sj.jcbfm.9600564.
Texte intégralRésumé :
The blood oxygenation level-dependent (BOLD) signal is the most commonly used modality of functional magnetic resonance imaging (fMRI) today. Although easy to implement, it is an ambiguous signal since it results from a combination of several hemodynamic factors. Functional cerebral blood flow changes, as measured by using arterial spin labeling (ASL), typically occur in the parenchyma and have been demonstrated to be more closely coupled to neural activation compared with BOLD. However, the intrinsically low signals from ASL techniques have hindered its widespread application to fMRI for basic research and even more so for clinical applications. Here, we report the first implementation of continuous ASL in the anaesthetized macaque at high magnetic field of 7T. The technique was optimized to permit maximum signal-to-noise ratio of functional perfusion-based images at high spatial resolution. The effect of labeling parameters, such as label time and post-label delay ( PLD), on functional cerebral blood flow (fCBF) in the visual cortex was evaluated. Functional cerebral blood flow maps did not change with increasing label time after 2,000 ms, indicating that a label time of 2,000 ms is sufficient for reliable mapping of fCBF. The percent changes obtained using fCBF were better localized to gray matter, than those obtained with BOLD. A short PLD of 200 ms revealed significantly higher fCBF changes at the cortical surface, indicating large-vessel contamination, than a long PLD of 800 ms. However, the effect of the PLD on fCBF was smaller than on baseline CBF. These results are of importance for high-resolution applications, and when accurate quantification is required for studies in monkeys as well as in humans.
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Araújo, Glaysson Aguilar de, Lara Alves Corrêa, Valéria Gama Fully Bressan, João Estevão Barbosa Neto et Bruna Camargos Avelino. « Relationship Between Free Cash Flows and Corporate Governance Levels in the Light of Agency Theory ». Revista Catarinense da Ciência Contábil 20 (30 novembre 2021) : e3206. http://dx.doi.org/10.16930/2237-7662202132062.
Texte intégralRésumé :
This research analyzes the relationship between free cash flows (FCFs) and the different levels of Corporate Governance present in the Brazilian stock market. To this end, the sample was composed of 212 Brazilian publicly traded companies listed on Brasil, Bolsa, Balcão [B]³, in the period from 2010 to 2018. The methodology consisted of estimating a regression for panel data, using the random effects model, estimating by generalized least square (GLS) and assuming adjustments for autocorrelation and robust standard errors for heteroscedasticity. The results found, for the sample studied, suggest that Corporate Governance levels are positively related to the FCFs. In synergy, when compared to the Traditional level of [B]³, companies listed on the Novo Mercado and Level 2 levels tend to present higher FCF values. In addition, the larger the size of the companies and the higher their return on equity, the higher their FCFs tend to be, just as companies in stages of maturity tend to present lower FCF values. The relevance of this research is based on analyzing, in a stock market subject to imperfections, factors that may affect decisions about the level of cash maintenance of companies, more specifically by evaluating how Corporate Governance mechanisms relate to the theory of FCFs, in a context of potential conflict of interest.
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Dacuba, Juan, Eva Cifrian, Maximina Romero, Tamara Llano et Ana Andrés. « Influence of Unburned Carbon on Environmental-Technical Behaviour of Coal Fly Ash Fired Clay Bricks ». Applied Sciences 12, no 8 (8 avril 2022) : 3765. http://dx.doi.org/10.3390/app12083765.
Texte intégralRésumé :
The incorporation of coal fly ash (CFA) in fired clay bricks (FCBs), as a clay replacement, contributes toward cleaner production practices. CFA disposal is an important issue worldwide due to its huge volume and to its potential negative environmental impacts, and currently does not have a recovery route due to its high concentration in unburned materials. In this study, the impact of the incorporation of two CFA, with different content of unburned carbon, FAA (low LOI) and FAB (high LOI) in FCBs, from a technical and environmental point of view was conducted. Unburned carbon plays an important role on the final properties of FCBs. The thermal decomposition during the firing process promotes an increase of water absorption, decreasing the flexural strength as the porosity increases, although the technical and mechanical properties of samples containing up to 30% FAA and percentages of 20% FAB are acceptable. The leaching behaviour showed an immobilisation of Cr and Se in FCBs while Mo reduced its mobility to values below non-hazardous limits. Acid gas emission values do not exceed the reference emission value, except for SO2 emissions while the level of CO2 emissions must be estimated based on the total annual production of the ceramic factory.
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Elalouf, Amir, Ariel Rosenfeld et Ofir Rockach. « The Extended David-Yechiali Rule for Kidney Allocation ». Mathematics 11, no 2 (8 janvier 2023) : 331. http://dx.doi.org/10.3390/math11020331.
Texte intégralRésumé :
The First Come First Served (FCFS) queuing policy is routinely assumed to be the benchmark policy for “fairness” in waiting-time performance. In this article, we propose a slight modification of the FCFS policy based on a natural extension of the well-established David and Yechiali (DY) rule and analyze it in the context of managing a waiting list for kidney transplants. In the proposed policy, the queuing agents are sequentially offered a stochastically arriving organ on a “first come, first served” basis while applying the individually optimal DY stopping rule. Through a realistic simulation, we show that the proposed policy, which we term Extended David and Yechiali (EDY), favorably compares to the FCFS policy in terms of medical efficiency while maintaining a comparable level of equity (i.e., fairness). Possible implications and practical aspects of the EDY are discussed.
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Yamazaki, Genji, et Masakiyo Miyazawa. « The equality of the workload and total attained waiting time in average ». Journal of Applied Probability 28, no 1 (mars 1991) : 238–44. http://dx.doi.org/10.2307/3214755.
Texte intégralRésumé :
It has recently been shown that, for the FCFS G/G/1 queue, the workload and attained waiting time of a customer in service have the same stationary distribution. We show that, for a general queueing system setting, the workload and total attained waiting time of customers in service are identical in average but the equality of the distributions is not true in general except for the FCFS G/G/1 queue.
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Yamazaki, Genji, et Masakiyo Miyazawa. « The equality of the workload and total attained waiting time in average ». Journal of Applied Probability 28, no 01 (mars 1991) : 238–44. http://dx.doi.org/10.1017/s0021900200039577.
Texte intégralRésumé :
It has recently been shown that, for the FCFS G/G/1 queue, the workload and attained waiting time of a customer in service have the same stationary distribution. We show that, for a general queueing system setting, the workload and total attained waiting time of customers in service are identical in average but the equality of the distributions is not true in general except for the FCFS G/G/1 queue.
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POPOV, A. D. « FUNDAMENTAL CHIRAL STRINGS ». Modern Physics Letters A 06, no 26 (30 août 1991) : 2423–28. http://dx.doi.org/10.1142/s0217732391002840.
Texte intégralRésumé :
The problem of the non-uniqueness of the string theory in the space Rd-1,1 with d ≤ 10 and the procedure of the compactification and the deompactification are discussed. We consider a compact bosonic string defined as a closed string moving in the Lorentizian torus T25,1 and introduce fundamental chiral bosonic string (FCBS) as a universal cover of a compact string. It is shown that the Fock spaces of any standard strings are embedded into the Fock space of FCBS.
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Ashlagi, Itai, Brendan Lucier et Moshe Tennenholtz. « Equilibria of Online Scheduling Algorithms ». Proceedings of the AAAI Conference on Artificial Intelligence 27, no 1 (30 juin 2013) : 67–73. http://dx.doi.org/10.1609/aaai.v27i1.8631.
Texte intégralRésumé :
We describe a model for competitive online scheduling algorithms. Two servers, each with a single observable queue, compete for customers. Upon arrival, each customer strategically chooses the queue with minimal expected wait time. Each scheduler wishes to maximize its number of customers, and can strategically select which scheduling algorithm, such as First-Come-First-Served (FCFS), to use for its queue. This induces a game played by the servers and the customers. We consider a non-Bayesian setting, where servers and customers play to maximize worst-case payoffs. We show that there is a unique subgame perfect safety-level equilibrium and we describe the associated scheduling algorithm (which is not FCFS). The uniqueness result holds for both randomized and deterministic algorithms, with a different equilibrium algorithm in each case. When the goal of the servers is to minimize competitive ratio, we prove that it is an equilibrium for each server to apply FCFS: each server obtains the optimal competitive ratio of 2.
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Hiremath, Gourishankar S., et Supratik Deb. « Export Performance of MSMEs in India : Is Credit Constraint an Invisible Gorilla ? » Indian Economic Journal 70, no 1 (30 novembre 2021) : 138–57. http://dx.doi.org/10.1177/00194662211062417.
Texte intégralRésumé :
We examine the effects of foreign currency borrowings (FCBs) and domestic market constraints on the performance of the export of the micro, small and medium enterprises (MSMEs) during the period 1988–2019. Our results show that access to the FCBs improved the performance of the MSME exports, indicating the importance of credit accessibility. MSMEs effectively utilise the grants when accompanied by credit facilities such as FCBs. We find that the high cost of debt and lack of financial development adversely affect the exports, as MSMEs are unable to borrow. The rupee depreciation alone does not help the MSMEs reap such depreciation benefits due to the lack of domestic credit. The recent policy stance of emphasis on MSMEs is expected to improve export performance. This study calls for the specialised window for the MSMEs to meet low cost and easy credit. The findings suggest stepping up grants to the MSMEs to improve the export performance. JEL Codes: F14, F34, F2, F31
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Dharmadasa, Pradeep. « Family Ownership and Firm Performance ». International Journal of Asian Business and Information Management 5, no 4 (octobre 2014) : 34–47. http://dx.doi.org/10.4018/ijabim.2014100104.
Texte intégralRésumé :
Numerous studies have focused on ownership structure and firm performance. In recent years a growing amount of research has recognized the importance of family-controlled firms (FCFs) where ownership concentrates on single individual or family. Despite many important insights, however, significant gaps in the literature remain. Studies have produced divergent findings about the performance of FCFs, leading to calls for further research. Utilizing 151 and 753 firm-years of FCFs drawn from the Colombo Stock Exchange, Sri Lanka, and the Tokyo Stock Exchange, Japan, respectively during 2011-2013, this study examines the relationship between family ownership and firm performance. Regression results show conflicting findings in that family ownership has a positive relationship with firm performance in Japan whereas a negative relationship is found in Sri Lanka. In sum, finding supports that view of the extant studies that family ownership and firm performance have a curvilinear relationship meaning that ownership concentration beyond a certain point likely creates entrenchment and consequently negative effects on performance.
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Saida, Satoshi, Tao Zhen, Erika Mijin Kwon, Guadalupe Lopez et Paul P. Liu. « Distinct Roles of GATA2 in Development and Evolution of CBFB-MYH11 AML ». Blood 132, Supplement 1 (29 novembre 2018) : 770. http://dx.doi.org/10.1182/blood-2018-99-110636.
Texte intégralRésumé :
Abstract Introduction. Core binding factor acute myeloid leukemia (CBF-AML) is caused by the dysfunction of a heterodimeric protein complex composed of the transcription factor RUNX1 and its partner CBFb. An inversion of chromosome 16 generates a fusion between CBFB and MYH11. The encoded fusion protein, CBFb-smooth muscle myosin heavy chain (SMMHC), contributes to the pathogenesis of CBF-AML. Our previous reports suggest that CBFB-MYH11 contributes to leukemogenesis by up-regulation of genes such as Gata2, which is an essential hematopoietic transcription factor. On the other hand, we recently identified recurrent monoallelic deletions of GATA2 on chromosome 3 in relapsed CBF-AML patients (Sood et al., Leukemia 30:501-504, 2016). From these findings we propose two hypotheses; 1) up-regulation of GATA2 contributes to leukemogenesis by CBFB-MYH11 in the initiation phase; 2) GATA2 deficiency contributes to the relapse of CBF-AML. Methods. Two datasets (GSE19194 and GSE102388) from microarray and RNA-Seq were used to determine Gata2 expression level in Cbfb-MYH11 preleukemic murine hematopoietic cells. Cbfb-MYH11 conditional knock-in (Cbfb+/56M), Gata2 conditional knockout (Gata2+/f), and Mx1-Cre transgenic mice were crossed to generate Gata2+/fCbfb+/56MMx1-Cre mice. Mice were injected with pIpC to induce the expression of Cbfb-MYH11 and/or knockout of Gata2 through Cre-recombinase activation. For transplantation assays, spleen cells obtained from leukemic mice were injected into irradiated recipient mice through tail vein. For in vitro colony forming assays, colonies were counted after 10 days in culture. Cell apoptosis was determined by Annexin V and 7AAD staining. Results. To test the first hypothesis, we determined the expression level of Gata2 in preleukemic cells in the Cbfb-MYH11 expressing mice. Data from both microarray and RNA-seq experiments revealed that Gata2 was highly expressed in the preleukemic hematopoietic cells of the Cbfb-MYH11 mice, as compared to those of the WT mice, and this finding was confirmed by qRT-PCR. Based on published ChIP-seq data, Gata2 is likely a direct transcriptional target of CBFb-SMMHC. Next, we determined the impact of Gata2 deficiency on leukemogenesis by Cbfb-MYH11. qRT-PCR showed reduced Gata2 expression in bone marrow cells from Gata2+/fCbfb+/56MMx1-Cre mice 12 days after pIpC injection (0.029±0.0092 vs 0.076±0.014; p=0.0089). Colony forming ability was decreased for the pre-leukemic bone marrow cells in Gata2+/fCbfb+/56MMx1-Cre mice when compared to Cbfb+/56MMx1-Cre mice (mean 37.2±6.35 vs. 74.23±8.335; p=0.0002). In addition, the Gata2+/fCbfb+/56MMx1-Cre mice had a smaller abnormal myeloid population in the bone marrow, which is capable of inducing leukemia, when compared with Cbfb+/56MMx1-Cre mice (mean 0.43±0.14% vs. 1.42±0.34%; p=0.0092). Most significantly, Gata2+/fCbfb+/56MMx1-Cre mice developed leukemia with a much longer latency than Cbfb+/56MMx1-Cre mice (median survival 215 days vs 125 days; p=0.0007). To test hypothesis 2, we compared the phenotype of the end stage mice for each genotype. Gata2+/fCbfb+/56MMx1-Cre mice had higher WBC count in peripheral blood than Cbfb+/56MMx1-Cre mice (mean 92,000±20,429 cells/ul vs. 35,644±12,001 cells/ul; p=0.0243), which is a poor prognostic marker in human leukemia. Leukemic cells from Gata2+/fCbfb+/56MMx1-Cre mice also had lower percentage of Annexin V positive cells than Cbfb+/56MMx1-Cre mice in short term culture (31.0±7.1 vs. 68.9±6.5%; p=0.0117). More importantly, upon transplantation, the recipient mice transplanted with Gata2+/fCbfb+/56MMx1-Cre leukemia cells developed leukemia much faster than recipient mice transplanted with equal numbers of Cbfb+/56MMx1-Cre leukemia cells (median survival 35.5 vs. 91.0 days; p<0.0001). Conclusions. Our findings suggest that Gata2 plays important but distinct roles in two different stages of Cbfb-MYH11 leukemia. Reduction of Gata2 activity delays leukemia development in primary Cbfb-MYH11 knockin mice, while contributing to a more aggressive phenotype in leukemic phase as shown in primary leukemic mice and transplanted recipients, which may be correlated with leukemia relapse in human patients. We are analyzing data from whole exome sequencing and RNA-seq to understand the mechanism underlying the observed phenotypes, and the findings will be presented at the annual meeting. Disclosures No relevant conflicts of interest to declare.
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Ahmed, A. I., M. S. Al-Sharif, M. S. Salim et T. A. Al-Ahmary. « Numerical solution of fractional variational and optimal control problems via fractional-order Chelyshkov functions ». AIMS Mathematics 7, no 9 (2022) : 17418–43. http://dx.doi.org/10.3934/math.2022960.
Texte intégralRésumé :
<abstract><p>In this paper, we present a new numerical method based on the fractional-order Chelyshkov functions (FCHFs) for solving fractional variational problems (FVPs) and fractional optimal control problems (FOCPs). The fractional derivatives are considered in the Caputo sense. The operational matrix of fractional integral for FCHFs, together with the Lagrange multiplier method, are used to reduce the fractional optimization problem into a system of algebraic equations. Some results concerning the approximation errors are discussed and the convergence of the presented method is also demonstrated. The performance of the introduced method is tested through several examples. Some comparisons with recent numerical methods are introduced to show the accuracy and effectiveness of the presented method.</p></abstract>
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Ahmed, A. I., et T. A. Al-Ahmary. « Fractional-Order Chelyshkov Collocation Method for Solving Systems of Fractional Differential Equations ». Mathematical Problems in Engineering 2022 (16 avril 2022) : 1–17. http://dx.doi.org/10.1155/2022/4862650.
Texte intégralRésumé :
This paper presents an efficient method for solving systems of fractional differential equations by using the fractional-order Chelyshkov functions (FCHFs). The fractional derivative and the fractional integral are considered in the Caputo sense and the Riemann–Liouville sense, respectively. The proposed method is based on using the operational matrix of fractional integration for FCHFs, together with the spectral collocation method to transform the system of fractional differential equations into a system of algebraic equations. The convergence of the presented method is demonstrated. The performance of the presented method is tested through various examples of systems of fractional differential equations. A comparison with some existing methods shows that the presented method can be successfully used to solve systems of fractional differential equations with accuracy and efficiency.
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Caldentey, René, Edward H. Kaplan et Gideon Weiss. « Fcfs infinite bipartite matching of servers and customers ». Advances in Applied Probability 41, no 3 (septembre 2009) : 695–730. http://dx.doi.org/10.1239/aap/1253281061.
Texte intégralRésumé :
We consider an infinite sequence of customers of types and an infinite sequence of servers of types where a server of type j can serve a subset of customer types C(j) and where a customer of type i can be served by a subset of server types S(i). We assume that the types of customers and servers in the infinite sequences are random, independent, and identically distributed, and that customers and servers are matched according to their order in the sequence, on a first-come–first-served (FCFS) basis. We investigate this process of infinite bipartite matching. In particular, we are interested in the rate ri,j that customers of type i are assigned to servers of type j. We present a countable state Markov chain to describe this process, and for some previously unsolved instances, we prove ergodicity and existence of limiting rates, and calculate ri,j.
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Caldentey, René, Edward H. Kaplan et Gideon Weiss. « Fcfs infinite bipartite matching of servers and customers ». Advances in Applied Probability 41, no 03 (septembre 2009) : 695–730. http://dx.doi.org/10.1017/s0001867800003530.
Texte intégralRésumé :
We consider an infinite sequence of customers of typesand an infinite sequence of servers of typeswhere a server of typejcan serve a subset of customer typesC(j) and where a customer of typeican be served by a subset of server typesS(i). We assume that the types of customers and servers in the infinite sequences are random, independent, and identically distributed, and that customers and servers are matched according to their order in the sequence, on a first-come–first-served (FCFS) basis. We investigate this process of infinite bipartite matching. In particular, we are interested in the rateri,jthat customers of typeiare assigned to servers of typej. We present a countable state Markov chain to describe this process, and for some previously unsolved instances, we prove ergodicity and existence of limiting rates, and calculateri,j.
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Hassin, Refael. « Equilibrium customers’ choice between FCFS and random servers ». Queueing Systems 62, no 3 (juillet 2009) : 243–54. http://dx.doi.org/10.1007/s11134-009-9127-8.
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Gore, A. D., et A. Karandikar. « Power-Controlled FCFS Splitting Algorithm for Wireless Networks ». IEEE Transactions on Vehicular Technology 59, no 2 (février 2010) : 842–56. http://dx.doi.org/10.1109/tvt.2009.2034458.
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Baghdadi, M., A. Jafari et A. Pardakhti. « Removal of crystal violet from aqueous solutions using functionalized cellulose microfibers : a beneficial use of cellulosic healthcare waste ». RSC Advances 6, no 66 (2016) : 61423–33. http://dx.doi.org/10.1039/c6ra08901a.
Texte intégralRésumé :
In this research, the preparation of functionalized cellulosic microfibers (FCMFs) was proposed as a beneficial use of cellulosic healthcare waste for the removal of crystal violet from aqueous solutions.
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Murauskas, Gediminas, et Marijus Radavičius. « Multi-Unit Assignment Problem : FCFS Course Allocation System Data Analysis ». Lietuvos statistikos darbai 55, no 1 (20 décembre 2016) : 70–80. http://dx.doi.org/10.15388/ljs.2016.13869.
Texte intégralRésumé :
We study the allocation of courses to students with multi-unit demand. Exploratory analysis of courseallocation practices at Vilnius University (VU) is performed. The allocation of students to courses is done by a simplefirst-come first-served (FCFS) procedure. We show that FCFS procedure does not deliver desirable outcomes. Data withstudent preferences is needed in order to compare assignment algorithms. We use censored regression model to constructstudent preferences generation mechanism based on empirical data collected at VU. Using simulated data several multiunitassignment algorithms are compared.