1,059 research outputs found
THE INFLUENCE OF EWOM AND EDITOR INFORMATION ON INFORMATION USEFULNESS IN VIRTUAL COMMUNITY
Information Usefulness, eWOM Information, Editor Information, Sense of Belonging
CTD small phosphatase like 2 (CTDSPL2) can increase ε- and γ-globin gene expression in K562 cells and CD34+ cells derived from umbilical cord blood
Methological quality of systematic reviews and meta-analyses on acupuncture for stroke: a review of review
Objective:
To assess the methodological quality of systematic reviews and meta-analyses regarding acupuncture intervention for stroke and the primary studies within them.
Methods:
Two researchers searched PubMed, Cumulative index to Nursing and Allied Health Literature, Embase, ISI Web of Knowledge, Cochrane, Allied and Complementary Medicine, Ovid Medline, Chinese Biomedical Literature Database, China National Knowledge Infrastructure, Wanfang and Traditional Chinese Medical Database to identify systematic reviews and meta-analyses about acupuncture for stroke published from the inception to December 2016. Review characteristics and the criteria for assessing the primary studies within reviews were extracted. The methodological quality of the reviews was assessed using adapted Oxman and Guyatt Scale. The methodological quality of primary studies was also assessed.
Results:
Thirty-two eligible reviews were identified, 15 in English and 17 in Chinese. The English reviews were scored higher than the Chinese reviews (P=0.025), especially in criteria for avoiding bias and the scope of search. All reviews used the quality criteria to evaluate the methodological quality of primary studies, but some criteria were not comprehensive. The primary studies, in particular the Chinese reviews, had problems with randomization, allocation concealment, blinding, dropouts and withdrawals, intent-to-treat analysis and adverse events.
Conclusions:
Important methodological flaws were found in Chinese systematic reviews and primary studies. It was necessary to improve the methodological quality and reporting quality of both the systematic reviews published in China and primary studies on acupuncture for stroke
SQUARE: Strategic Quantum Ancilla Reuse for Modular Quantum Programs via Cost-Effective Uncomputation
Compiling high-level quantum programs to machines that are size constrained
(i.e. limited number of quantum bits) and time constrained (i.e. limited number
of quantum operations) is challenging. In this paper, we present SQUARE
(Strategic QUantum Ancilla REuse), a compilation infrastructure that tackles
allocation and reclamation of scratch qubits (called ancilla) in modular
quantum programs. At its core, SQUARE strategically performs uncomputation to
create opportunities for qubit reuse.
Current Noisy Intermediate-Scale Quantum (NISQ) computers and forward-looking
Fault-Tolerant (FT) quantum computers have fundamentally different constraints
such as data locality, instruction parallelism, and communication overhead. Our
heuristic-based ancilla-reuse algorithm balances these considerations and fits
computations into resource-constrained NISQ or FT quantum machines, throttling
parallelism when necessary. To precisely capture the workload of a program, we
propose an improved metric, the "active quantum volume," and use this metric to
evaluate the effectiveness of our algorithm. Our results show that SQUARE
improves the average success rate of NISQ applications by 1.47X. Surprisingly,
the additional gates for uncomputation create ancilla with better locality, and
result in substantially fewer swap gates and less gate noise overall. SQUARE
also achieves an average reduction of 1.5X (and up to 9.6X) in active quantum
volume for FT machines.Comment: 14 pages, 10 figure
An Embedded Voltage Harmonic Compensation Strategy for Current Controlled DG Interfacing Converters
Full-State Quantum Circuit Simulation by Using Data Compression
Quantum circuit simulations are critical for evaluating quantum algorithms
and machines. However, the number of state amplitudes required for full
simulation increases exponentially with the number of qubits. In this study, we
leverage data compression to reduce memory requirements, trading computation
time and fidelity for memory space. Specifically, we develop a hybrid solution
by combining the lossless compression and our tailored lossy compression method
with adaptive error bounds at each timestep of the simulation. Our approach
optimizes for compression speed and makes sure that errors due to lossy
compression are uncorrelated, an important property for comparing simulation
output with physical machines. Experiments show that our approach reduces the
memory requirement of simulating the 61-qubit Grover's search algorithm from 32
exabytes to 768 terabytes of memory on Argonne's Theta supercomputer using
4,096 nodes. The results suggest that our techniques can increase the
simulation size by 2 to 16 qubits for general quantum circuits.Comment: Published in SC2019. Please cite the SC versio
Study of the Global Alignment for the DAMPE Detector
The Dark Matter Particle Explorer (DAMPE) is designed as a high energy
particle detector for probing cosmic-rays and rays in a wide energy
range. The trajectory of the incident particle is mainly measured by the
Silicon-Tungsten tracKer-converter (STK) sub-detector, which heavily depends on
the precise internal alignment correction as well as the accuracy of the global
coordinate system. In this work, we carried out a global alignment method to
validate the potential displacement of these sub-detectors, and particularly
demonstrated that the track reconstruction of STK can well satisfy the required
objectives by means of comparing flight data and simulations.Comment: 18 pages, 11 figure
- …