Miracle-dz/UniFAR-FTUs huggingface dataset:
A Hash-Based Locator/ID Mapping Mechanism

  Abstract —With the development of Internet, the original TCP/IP architecture has faced some critical challenges from scalability, mobility, security and so on. It also hampered the development of some new network technologies such as multi-homing, traffic engineering. It is well known that one of the most important reasons is IP address semantic overloading. As a result, academy commonly considered that we should give a clean-slate design for the naming and addressing architecture of the future Internet. “Locator/ID Split” is one of the most important research areas. The scalable flat-labels based mapping service is the kernel of “Locator/ID Split”. HLIM uses hash-based routing to provide a deterministic mapping resolution for the edge network through distributed mapping servers. HLIM satisfies the scalability of the flat-labels mapping service, and can adapt mapping nodes’ dynamic join and exit.
Coflow routing and spectrum assignment in optical orthogonal frequency division multiplexing data center networks

Abstract. The communication between data-intensive applications in data centers often involves a collection of parallel flows, usually referred to as a coflow. A coflow between two groups of machines can capture diverse communication patterns observed in data centers. The static coflow routing and spectrum assignment (CofRSA) problem in optical orthogonal frequency division multiplexed data center networks is investigated, when the coflow traffic demands are given. The static CofRSA problem considers the spectrum constraints of the flows between different coflows and those within the same coflow. We formulate the static CofRSA problem as an integer linear programming (ILP) model. The objective of the ILP model is to minimize the used spectrum slots. However, the ILP model cannot achieve an optimal solution within tolerable time for large networks. To solve the problem, two highly efficient heuristic algorithms, the most cofSize first (MCSF) ordering algorithm and the greedy inserting (GI) algorithm, are proposed to achieve suboptimal solutions. The simulation results indicate that ILP provides an optimal solution for small networks, whereas GI and MCSF yield suboptimal solutions in large networks. The results also show that GI provides more efficient solutions than MCSF.
Reconsideration of Loop Gain and Its Measurement in DC–DC Converters

Two measurement schemes, namely, the modulation signal perturbation scheme and the pulse perturbation scheme, have been used for evaluating the loop gain of dc–dc converters. However, the two measured loop gains do not give consistent results due to the use of different forms of the injected small perturbation signal, and the difference in the two schemes cannot be distinguished by the usual averaged model. In this paper, the two loop gain measurement schemes are analyzed based on an extended-frequency-range small-signal model. Expressions of the loop gain are derived and their use in stability assessment and derivation of closed loop transfer functions is demonstrated. A sample-and-hold scheme is proposed as a simple alternative implementation of the pulse perturbation scheme. Finally, experimental prototypes of buck, boost, and buck–boost converters are tested for verification of the analytical results and the effectiveness of the sample-and-hold scheme.
Optimisation of the Lift Carrying Frame Construction by Using Finite Element Method

Numerical analysis of the carrying frame subassemblies strength installed in the friction lift was presented in this article. Two models of the frame loading were introduced. One of them was applied during loading and the other one during regular operation with nominal load capacity. Finite Element Method was used for calculations. It allows mapping the actual operating conditions by using commercial SolidWorks software. Modifications in the frame key subassemblies from geometrical point of view were proposed. Due to them, the frame weight was reduced by 20% and a safety coefficient was maintained at the level of 3.
This is a post peer- review pre copy edit version of an article to be published in Higher Education .

This article asks what makes PhD completers resilient and which resilience protection factors help them complete their doctoral programme? A narrative inquiry methodology is applied to capture the experiences of eleven doctoral students who completed their PhDs in the United Kingdom. Data collected from interview conversations were analysed using resilience theory as a lens. We found that for these completers, success did not rely solely on the individual student, nor was the role of supervisors elevated, particularly for social and emotional support. Of importance was the students’ family and social network, institutional context and the nature of university central services and how these were available to the completers. The study‘s contribution to the literature is in showing how the alignment of the completers’ personal responses, environmental and social connections and institutional processes was available to build resilience, as we present a model for resilience protection in doctoral students . We hope the findings presented will be of interest to PhD students, supervisors and other academic colleagues in universities globally, as they seek insights into successful PhD completion. their self-doubt. However, they identified a set of key elements that linked their personal strategies for coping, notably both from their past and present memories of other difficult experiences they had previously had and overcome (Luthar & Cicchetti, 2000), and their previously held personal stress-reducing activities, such as engaging in physical exercise. Our study confirms a range of factors conceptualised as important for successful doctoral completion in our literature review, including a manageable amount of stress and making progress (Devos et al. 2017 ) and good interpersonal relationships (Sorensen, 2016).
Reconfigurable CTS Antenna Fully Integrated in PCB Technology for 5G Backhaul Applications

We present the design and fabrication of a fully integrated continuous transverse stub (CTS)/pillbox antenna for 5G backhaul applications in the E-band. The antenna contains 16 radiating slots excited by a corporate feed network in the parallel-plate waveguide (PPW) technology. These slots are divided into two subarrays of eight slots, each one generating either a sum or a difference pattern along the E-plane. Two pillbox systems are used to feed the two subarrays, and therefore, the radiation patterns can be steered in the H-plane. Such a reconfigurability, both in the E- and H-planes, has not been reported with CTS antennas. Moreover, the recently introduced the substrate-integrated PPW (SI-PPW) technology is used in the printed circuit board technology for complete integration of the antenna module. The structure is thinner than 3 mm, and only low-cost standard fabrication processes are employed for the prototype. The measurement results are in good agreement with simulations. In the E-plane, the sum and difference patterns can cover an angular window of ±10°, and they can be steered in H-plane until ±14° in the complete E-band (71–86 GHz). Over this frequency band, the measured difference pattern exhibits a null depth below −23 dB. The gain remains stable over the band with a maximum of 17.5 dBi and a variation lower than 2.6 dB.
Gate leakage mechanisms in normally off p-GaN/AlGaN/GaN high electron mobility transistors

In this letter, gate leakage mechanisms in different gate contact normally off p-GaN/AlGaN/GaN high electron mobility transistors (HEMTs) have been studied by the temperature-dependent current-voltage (IG-VG) measurement. It is found that two-dimensional variable range hopping is responsible for gate leakage current at the reverse gate bias and low forward gate bias in both high-leakage and low-leakage Schottky gate contact devices. At high forward gate bias, in the case of high-leakage Schottky contact, the dominant current conduction mechanism is found to be thermionic field emission while it is Poole–Frenkle emission (PFE) for the case of low-leakage Schottky contact and the activation energy of trap states for PFE current is derived as 0.6 eV. Besides, related models are also proposed to describe the gate leakage current in p-GaN gate HEMTs and they match well with the experimental gate leakage current within a wide range of temperatures and gate biases.In this letter, gate leakage mechanisms in different gate contact normally off p-GaN/AlGaN/GaN high electron mobility transistors (HEMTs) have been studied by the temperature-dependent current-voltage (IG-VG) measurement. It is found that two-dimensional variable range hopping is responsible for gate leakage current at the reverse gate bias and low forward gate bias in both high-leakage and low-leakage Schottky gate contact devices. At high forward gate bias, in the case of high-leakage Schottky contact, the dominant current conduction mechanism is found to be thermionic field emission while it is Poole–Frenkle emission (PFE) for the case of low-leakage Schottky contact and the activation energy of trap states for PFE current is derived as 0.6 eV. Besides, related models are also proposed to describe the gate leakage current in p-GaN gate HEMTs and they match well with the experimental gate leakage current within a wide range of temperatures and gate biases.
Parallel Ports. Sociotechnical Change from the Alt-Right to Alt-Tech

Empfohlene Zitierung / Suggested Citation: Donovan, Joan; Lewis, Becca; Friedberg, Brian: Parallel Ports: Sociotechnical Change from the Alt-Right to Alt-Tech. In: Maik Fielitz, Nick Thurston (Hg.): Post-Digital Cultures of the Far Right: Online Actions and Offline Consequences in Europe and the US. Bielefeld: transcript 2019, S. 49– 65. DOI: https://doi.org/https://dx.doi.org/10.14361/9783839446706-004.
A Generalized Additional Voltage Pumping Solution for High-Step-Up Converters

This study develops a generalized additional voltage pumping solution (GAVPS) for a series of high-step-up converters, whose topologies can be modeled by a generalized architecture. The newly designed converters can achieve additional voltage pumping by only applying an additional diode and capacitor to the conventional high step-up converter structure. Integrating the proposed solution into the existing high-step-up converters, five typical case studies with corresponding analyses and comparisons are conducted and presented, which verifies the proposed voltage pumping strategy. Additionally, five prototypes are built in this study, and the experimental results further validate the effectiveness of the proposed GAVPS solution. The proposed strategy in theory will work synergistically with all types of dc–dc converters, which demonstrates its unparalleled significance in expanding its applicability in contemporary power converter industries.
An Effective Solution for Regeneration Protection in Uninterruptible Power Supply

In this paper, a regeneration protection solution is proposed to address the dc-link overvoltage issue and the unequal power sharing in the parallel uninterruptible power supply (UPS) systems. First, a dc-link voltage protection control strategy is proposed to protect the inverter against the excessive dc-link voltage that may trigger the protection mechanism of the UPS system. In addition, an active power-sharing control strategy by regulating the virtual resistance is proposed to solve the circulating current caused by UPS regeneration issue. Finally, the feasibility of the proposed regeneration protection solution is verified by experimental results from the parallel UPS system prototype.
Detection and Spatial Identification of Fault for Parabolic Distributed Parameter Systems

In this paper, a novel method is developed to detect fault and identify its spatial location for a class of parabolic distributed parameter systems (DPSs) with limited sensors. The normal situation of the DPSs is first modeled under limited sensors. Then, the spatio–temporal dynamics of DPSs is decoupled under time/space separation. After the temporal coefficients are further decomposed using the independent component analysis method, the dominant temporal components are taken and then the spatial residual errors are used to form two monitoring statistics. Using the kernel density function, the confidence bounds of these two statistics (fault free) can be established as the reference signals. Unlike model-based fault detection methods that require explicit mathematical models of the processes, the proposed method is data driven and only utilizes the separable characteristic of parabolic DPSs. Experiments on a typical parabolic process and a snap curing oven are used to verify the effectiveness of the proposed method.
Enhanced Generalized Vector Control Strategy for Torque Ripple Mitigation of IPM-Type Brushless DC Motors

Optimal currents with appropriate harmonic components injected into the motor windings can effectively mitigate torque ripple for interior permanent magnet (IPM) type brushless dc motors (BLDCMs). However, existing approaches may fail to accurately inject the optimal currents into motors due to the limited current loop bandwidth. This paper proposes a simple enhanced generalized vector control strategy to mitigate the torque ripple for IPM-type BLDCMs. With the proposed vector control strategy, the control block diagram for IPM-type BLDCMs is as simple as that with traditional vector control for sinusoidal permanent magnet synchronous motors. First, an electromechanical energy conversion voltage (EECV), considering the effects of the non-sinusoidal back-EMF and the rotor salience property, is proposed in αβ-axis. Then, a novel coordinate frame is constructed with the proposed EECV, which is based on the arbitrary reference frame theory. As a result, the currents of IPM-type BLDCMs can be decomposed into two constant components, one being linked to the torque and the other one to the flux linkage. Thus, the bandwidth of current loop with simple proportional integral regulator can be equivalently expanded in the proposed coordinate frame. Finally, comprehensive experiments are conducted in different operation conditions to validate the effectiveness of the proposed vector control strategy.
A fuzzy adaptive controller for cuckoo search algorithm in active suspension system

This paper presents a fuzzy adaptive cuckoo search algorithm to improve the cuckoo search algorithm, which may easily fall into a local optimum when handling multiobjective optimization problems. The Fuzzy–Proportional-Integral-Derivative (PID) controller design for an active micro-suspension system has been incorporated into the proposed fuzzy adaptive cuckoo search algorithm to improve both driving comfort and road handling. In the past research, a genetic algorithm was often applied in Fuzzy–PID controller design. However, when the dimension is high and there are numerous local optima, the traditional genetic algorithm will not only have a premature convergence, but may also be trapped in the local optima. In the proposed fuzzy adaptive cuckoo search, all parameters of the PID controller and fuzzy rules are real coded to 75 bits in the optimization problem. Moreover, a fuzzy adaptive strategy is proposed for dynamically adjusting the learning parameters in the fuzzy adaptive cuckoo search, and this indeed enables global convergence. Experimental results verify that the proposed fuzzy adaptive cuckoo search algorithm can shorten the computing time in the evolution process and increase accuracy in the multiobjective optimization problem.
Exploring the Role of Project Management in the Development of the Academic Agile Software Discourse: A Bibliometric Analysis

The practical applications of agile methods and their impact on the productivity and efficiency of software development dominate the agile literature. We analyzed 827 academic articles with bibliometric techniques to explore the role project management research played in the development of the academic agile discourse. Bibliometric analyses over two time periods reveal that project management–related topics form a distinct stream of research in the second time period but not in the first. Furthermore, our results reveal that the academic agile discussion has been mainly unidirectional. This situation offers many opportunities for project management researchers to contribute to the agile discourse.
A 4.6-ppm/°C High-Order Curvature Compensated Bandgap Reference for BMIC

This brief presents a high precision high-order curvature-compensated bandgap voltage reference (BGR) with a 3.11-V output voltage for battery-management integrated circuits. The proposed circuit utilizes the exponential characteristics of the base current and the resistance between bases of bipolar transistors to perform corrections. The curvature of subthreshold-operating MOSFETs is considered to further compensate for high-order temperature effects over a wide temperature range of 170 °C. Test results for the proposed BGR fabricated utilizing a standard 0.18-<inline-formula> <tex-math notation="LaTeX">${\mu }\text{m}$ </tex-math></inline-formula> BiCMOS process demonstrate that its line regulation is approximately 0.31 mV/V in a supply voltage range of 4.2–6.0 V. with 4-bit trimming, a temperature coefficient of 4.6 ppm/°C is obtained in the range of −40 °C to 130 °C. The active area of the proposed BGR is 634 <inline-formula> <tex-math notation="LaTeX">${\times }$ </tex-math></inline-formula> 351 <inline-formula> <tex-math notation="LaTeX">${\mu }\text{m}$ </tex-math></inline-formula>.
Performance improvement of piezoelectric materials in energy harvesting in recent days – a review

Piezoelectric elements are inevitable in modern day physics playing a vital role in many applications. Any piezoelectric element requires compression to produce energy in the form of a weak electrical ac signal. Mechanical vibrations are known to cause deflections which are enough to produce energy from the piezoelectric materials. In this paper, a review of the piezoelectric materials is made on their basic modes of excitation for producing energy. Also, various mechanisms and techniques used to harvest energy recently are presented and discussed extensively. Piezoelectric energy harvesting using MEMS is emphasized much as this is the era of micromechanical systems. Most of the piezoelectric energy harvesting systems relies on cantilever-oriented deflection to produce maximum vibration. In general cantilever beams fitted with piezoelectric materials produce electrical energy from mechanical vibration when deflected; hence detailed review on the different shapes of cantilever is also submitted. Significant parameters contributing to improved performance are dealt with special importance.
Thermoacoustics of Can-Annular Combustors

Can-annular combustors consist of a set of independent cans, connected on the upstream side to the combustor plenum and on the downstream side to the turbine inlet, where a transition duct links the round geometry of each can with the annular segment of the turbine inlet. Each transition duct is open on the sides toward the adjacent transition ducts, so that neighboring cans are acoustically connected through a so-called cross-talk open area. This theoretical, numerical, and experimental work discusses the effect that this communication has on the thermoacoustic frequencies of the combustor. We show how this communication gives rise to axial and azimuthal modes, and that these correspond to particularly synchronized states of axial thermoacoustic oscillations in each individual can. We show that these combustors typically show clusters of thermoacoustic modes with very close frequencies and that a slight loss of rotational symmetry, e.g., a different acoustic response of certain cans, can lead to mode localization. We corroborate the predictions of azimuthal modes, clusters of eigenmodes, and mode localization with experimental evidence.
Bearing fault diagnosis based on spectrum image sparse representation of vibration signal

Bearings are crucial for industrial production and susceptible to malfunction in rotating machines. Image analysis can give a comprehensive description of vibration signal, thus, it has achieved much more attention recently in fault diagnosis field. However, it brings lots of redundant information from a single spectrum image matrix behind rich fault information, and massive spectrum image samples lead to exacerbation of this situation, which readily results in the accuracy-dropping problem of multiple local defective bearings diagnosis. To solve this issue, a novel feature extraction method based on image sparse representation is proposed. Original spectrum images are acquired through fast Fourier transformation. Sparse coefficient that reveals the underlying structure of spectrum image based on raw signals is extracted as the feature by implementing the orthogonal matching pursuit and K-singular value decomposition algorithm strategically, and then two-dimensional principal component analysis is applied for further processing of these features. Finally, fault types are identified based on a minimum distance strategy. The experimental results are given to demonstrate the effectiveness of the proposed method.
Evaluation of Electronic Programme Guide Adoption Using UTAUT2 Based Model

: In this paper we describe research in the ways in which consumers reach the information on television programme schedule and what motivates them to use the electronic programme guide service. The research was carried out using the Unified theory of acceptance and use of technology 2 (UTAUT2) model on a sample of N=234 respondents in the Republic of Croatia. The survey found that, when consumers want to get information about programme scheduling or event information, 55.5% of them first choose to use the electronic programme guide (EPG), and that the rest of them rather use teletext, Internet portals and smartphone applications or printed programme guides as a first choice. The research model based on UTAUT2 explained almost 90% of the variance in behavioural intention to use the electronic programme guide and 78% of the variance in use of the EPG. The intention to use the EPG is driven mainly by the user’s habit with more than 50% of influence on the behavioural intention, followed by the users’ perception that the EPG as a solution gives them high quality information which they can retrieve quickly, as well as ease of use of the EPG application and the fact that it is free to use. The actual use of the EPG is influenced by the facilitating conditions which include availability of an electronic programme guide on every television set or digital receiver and users’ perception that they know how to use the application, habit and intention to use. Indirectly, through the intention to use, the fact that the electronic programme guide is quick and reliable, easy to use and free also plays a major role in use behaviour.