Recent work on "learned indexes" has changed the way we look at decades-old field of DBMS indexing. The key idea is that indexes can be thought as "models" predict position a in dataset. Indexes can, thus, learned. original by Kraska et al. shows learned index beats B+Tree factor up to three search time and an order magnitude memory footprint. However, it limited static, read-only workloads. In this paper, present new called ALEX which addresses practical issues arise when implementing for...

x wt.% B4C/Ti6Al4V titanium matrix composites were prepared by selective laser melting (SLM) technology. The microstructure and mechanical properties of the SLM-formed heat-treated samples studied in detail. results indicated that an in-situ reaction occurred during SLM process, producing acicular TiB, whisker TiB granular TiC. microhardness melted sample increased with increasing B4C content. When (B4C) is 0.05, properties, i.e., compressive strength, strain, tensile strength elongation,...

Large flash disks, or solid state drives (SSDs), have become an attractive alternative to magnetic hard due their high random read performance, low energy consumption and other features. However, writes, especially small on disks are inherently much slower than reads because of the erase-before-write mechanism. To address this asymmetry read-write speeds in tree indexing disk, we propose FD-tree, a index designed with logarithmic method fractional cascading techniques. With method, FD-tree...

Doubly fed induction generator (DFIG) wind turbines with virtual inertia control are coupled to power system in dynamic characteristics, and the input of is directly affected by tracking ability phase-locked loop (PLL). Thus, it urgent study impact DFIG on small-signal stability considering effects PLL. First, based operation characteristic strategy, a model interconnected integration PLL inertial established. Second, attenuation time constants state variables calculated, according speeds...

Large flash disks have become an attractive alternative to magnetic hard disks, due their high random read performance, low energy consumption and other features. However, writes, especially on the disk are inherently much slower than reads because of erase-before-write mechanism. To address this asymmetry read-write speeds in indexing disk, we propose FD-tree, a tree index designed with logarithmic method fractional cascading techniques. With method, FD-tree consists head - small B+-tree...

FPGAs are an attractive platform for applications with high computation demand and low energy consumption requirements. However, design effort FPGA implementations remains high—often order of magnitude larger than using high‐level languages. Instead this time‐consuming process, synthesis (HLS) tools generate hardware from algorithm descriptions in languages such as C/C++ SystemC. Such reduce effort: more compact less error prone. HLS promise development abstracted software designer knowledge...

The growing popularity of the JSON format has fueled increased interest in loading and processing data within analytical systems. However, many applications, parsing dominates performance cost. In this paper, we present a new parser called Mison that is particularly tailored to class by pushing down both projection filter operators queries into parser. To achieve these features, propose deviate from traditional approach building parsers using finite state machines (FSMs). Instead, follow...

Abstract Two novel alternating π‐conjugated copolymers, poly[2,8‐(6,6′,12,12′‐tetraoctyl‐6,12‐dihydroindeno‐[1,2b]fluorene‐ alt ‐5(1‐(2,6‐diisopropylphenyl)‐2,5‐di(2‐thienyl)pyrrole) ( P1 ) and ‐5(1‐(p‐octylphenyl)‐2,5‐di(2‐thienyl)pyrrole) P2 ), were synthesized via the Suzuki coupling method their optoelectronic properties investigated. The resulting polymers completely soluble in various common organic solvents weight‐average molecular weights M w 5.66 × 10 4 (polydispersity: 1.97) 2.13×...

This paper presents a technique called WideTable that aims to improve the speed of analytical data processing systems. A is built by denormalizing database, and then converting complex queries into simple scans on underlying (wide) table. To avoid pitfalls associated with denormalization, e.g. space overheads, uses combination techniques including dictionary encoding columnar storage. When data, outer joins ensure tables in schema graph, which are now nested as embedded WideTable, processed...

Actuators have many applications in artificial muscles, soft robots, and optical switches. Herein, we designed fabricated a multifunctional actuator using cellulose composites that can be driven by humidity, natural sunlight, electrothermal processes. Highly conductive flexible cellulose, MXene, PEDOT:PSS composite (CMPC) films were prepared with facile blending-vacuum filtration method. Benefiting from the high conductivity, CMPC film exhibited excellent performance electromagnetic...

A reflect-transmit-array antenna (RTA) with dual-operating modes is proposed in this letter. The RTA, which has a three-layer structure without air layers, can achieve reflectarray-mode (RAM) at 11-14 GHz and transmitarray-mode (TAM) 15-19 GHz. When the incident electromagnetic (EM) wave y-polarization, RTA operates RAM, reflected EM y-polarization. In comparison, TAM transmitted circular polarization (CP) when x-polarization. dual-mode wideband been fabricated measured to validate design....

This note proposes an interval analysis approach to invariance control synthesis for switched nonlinear systems without assuming that the subsystems are stable or have common equilibrium points. Partition-based controllers extracted via iterative computation of controlled invariant sets based on branch-and-bound scheme. method is guaranteed be finitely determined and complete, provided system satisfies a robustly condition. Two examples drawn from practical applications show effectiveness...

A method to analyze the angle stability of power system with multiple operating conditions considering cascading failure is proposed in this paper. First, stochastic events such as uncertain operation protection/breaker and hardware failure, condition set determined based on flow transfer theory matrix probability between different calculated. On basis, discrete Markov model established. And then, construct Lyapunov functional containing model, derive robust criterion which satisfies...

This paper presents ROCS, an algorithmic control synthesis tool for nonlinear dynamical systems. Different from other formal tools, it guarantees to generate a strategy with respect robustly realizable specification system. At the core of ROCS is interval branch-and-bound scheme precision parameter that reflects robustness realizability specification. It also supports multiple variable parameters achieve higher efficiency.

A cellulose-based flexible OLED using a PEDOT:PSS (PH1000) electrode exhibits enhanced stability and light extraction efficiency compared with that an ITO electrode.

Here, the novel combination of multi-interlayers composed Ni, Al, and Zn foil was used to join AZ31/2024 dissimilar alloys via ultrasonic-assisted transient liquid phase bonding (U-TLP) in air condition. This multi-interlayer acts as a 'physical barrier' forbid formation Mg–Al Intermetallic compounds (IMCs) engineer IMCs improve mechanical performance. The function Al interlayer is form Al–Ni Al-Mg-Zn products reduce excess dissolution AZ31. Results show that adopting Al/Zn/Ni/Zn helped...

Contact-based decision and planning methods are becoming increasingly important to endow higher levels of autonomy for legged robots. Formal synthesis derived from symbolic systems have great potential reasoning about high-level locomotion decisions achieving complex maneuvering behaviors with correctness guarantees. This study takes a first step toward formally devising an architecture composed task control whole-body dynamic in constrained dynamically changing environments. At the high...

The change detection (CD) of heterogeneous remote sensing images is an important but challenging task. difficulty to obtain the information by directly comparing different statistical characteristics acquired sensors. This paper proposes unsupervised method for image CD based on domain transfer network. First, attention mechanism added Cycle-generative adversarial networks (Cycle-GANs) a more consistent feature expression transferring bi-temporal common domain. Euclidean distance...