Jian Wan

Characterizing the Effectiveness of Query Optimizer in Spark

2018

In the big data community, Spark has been widely used for processing interactive queries. Spark employs a query optimizer, called Catalyst, to provides a set of optimization rules and supports Cost-Based Optimization (CBO). In this …

Energy Aware Virtual Machine Scheduling in Data Centers

2019 · Energies

Power consumption is a primary concern in modern servers and data centers. Due to varying in workload types and intensities, different servers may have a different energy efficiency (EE) and energy proportionality (EP) even while …

Local Epochs Inefficiency Caused by Device Heterogeneity in Federated Learning

2022 · Wireless Communications and Mobile Computing

Federated learning is a new framework of machine learning, it trains models locally on multiple clients and then uploads local models to the server for model aggregation iteratively until the model converges. In most cases, …

A Named Entity Recognition Method Based on Knowledge Distillation and Efficient GlobalPointer for Chinese Medical Texts

2024 · IEEE Access

The task of named entity recognition has been widely used in medical text analysis, but there is still the problem of poor transfer ability in practical applications. This work proposes a novel named entity recognition …

Location-Aware Service Recommendation With Enhanced Probabilistic Matrix Factorization

2018 · IEEE Access

Owing to the ever-growing popularity of mobile computing, a large number of services have been developed for a variety of users. Considering this, recommending useful services to users is an urgent problem that needs to …