A5101771583- Caching and Content Delivery
- Cloud Computing and Resource Management
- Mobile Ad Hoc Networks
- Opportunistic and Delay-Tolerant Networks
- Peer-to-Peer Network Technologies
- Vehicular Ad Hoc Networks (VANETs)
- Advanced Data Storage Technologies
- Perovskite Materials and Applications
- Distributed and Parallel Computing Systems
- Conducting polymers and applications
- EEG and Brain-Computer Interfaces
- ECG Monitoring and Analysis
- Energy Efficient Wireless Sensor Networks
- Chalcogenide Semiconductor Thin Films
- Advanced Authentication Protocols Security
- Cardiac Imaging and Diagnostics
- Impact of Technology on Adolescents
- Gaze Tracking and Assistive Technology
- Cooperative Communication and Network Coding
- Privacy-Preserving Technologies in Data
- Neuroscience and Neural Engineering
- Optimization and Search Problems
- Graph Theory and Algorithms
- IoT and Edge/Fog Computing
- Security in Wireless Sensor Networks
Chongqing University
2025
University of Electronic Science and Technology of China
2024
Shaoxing University
2024
University of Victoria
2013-2019
Nankai University
2007-2010
We employed RbI additive, constructed heterojunction, and used TOPO post-treatment for suppressing non-radiative recombination of MA-free WBG perovskite. The device showed a record PCE 23.35%, high V OC 1.3 the impressive stability.
Geocast, delivering messages to a specific location, has become an important issue with the accelerated development of location-based services in mobile networks. Geocast automotive domain is particular interest, enabling many promising applications, such as geographic advertising, traffic alerts, etc. Different from conventional geocast algorithms focusing on distance-based approaches, this paper, we propose mobility-aware algorithm (GeoMob) for urban VANETs Delay-Tolerant Network (DTN)...
Data-intensive applications need to address the problem of how properly place set data items distributed storage nodes. Traditional techniques use hashing method achieve load balance among nodes such as those in Hadoop and Cassandra, but they do not work efficiently for requests reading multiple one transaction, especially when source locations are also distributed. Recent works proposed managed placement schemes online social networks, have a limited scope due their focuses. We propose an...
Printing of electrodes to replace thermal evaporation metals for back contacts in perovskite solar cells (PSCs) is essential scalable manufacturing. However, PSCs incorporating printed typically exhibit lower...
Abstract Owing to their low toxicity and remarkable stability, perovskites based on antimony bismuth have garnered significant interest in recent years. However, A 3 B 2 X 9 perovskite materials derived from face several challenges, including excessively wide band gaps, elevated defect densities, suboptimal film quality, all of which hinder advancements device efficiency. While extensive studies been undertaken investigate the effects modulating A-site X-site elements lead-free perovskites,...
Low-latency data service is an increasingly critical challenge for center applications. In modern distributed storage systems, proper placement helps reduce the movement delay, which can contribute to latency reduction tremendously. Existing solutions have often assumed prior distribution of requests or discovered it via trace analysis. However, a difficult online decision-making problem faced with dynamic network conditions and time-varying user request patterns. The conventional static...
Data-intensive applications need to address the problem of properly placing set data items in geo-distributed storage nodes. Traditional techniques use hashing method achieve load balance among nodes such as those used Hadoop and Cassandra, but are not efficient for requests reading multiple one transaction, especially when source locations also distributed. Some recent papers proposed managed placement schemes online social networks, have a limited scope due their focuses. We propose...
Information-Centric Networking (ICN) has a great potential to better support the content distribution over future Internet. Meanwhile, users with mobile devices will also access ICN, introducing new challenge ICN providers handle such requests. In this paper, mobility and popularity-based caching strategy is proposed increase cache hit rate through WiFi while people are moving from one hotspot another. It thus lowers network traffic local outside Specifically, precise derivation on request...
With the increasing demand of big data applications, a variety problems on how to operate supporting infrastructures more intelligently and efficiently have attracted much attention in literature. To optimize placement among distributed network locations is one fundamental problems, which aims at facilitating storage access. However, traditional schemes meet challenges running time overhead introduced due scale datasets. Therefore, we propose novel scheme based sketches overcome these...
Geocast, which consists of delivering messages to a specific location, has become an important technique with the accelerated development location-based services in mobile networks. Geocast automotive domain is particular interest, enabling many promising applications, such as geographic advertising, traffic alerts, etc. Different from conventional geocast algorithms focusing on distance-based approaches, this paper, we propose node mobility-aware and contact-aware algorithm (GeoMobCon) for...
Delay-Tolerant Networks (DTNs) are wireless mobile networks, where the nodes sparse and end-to-end connectivity is rare. Since DTN mostly energy-limited devices, there an immediate need to have energy-efficient routing protocols, allowing network perform better function longer. Besides, in real world, people carrying form a lot of communities because similar interests, they behave with social selfishness. How improve energy efficiency multi-community scenarios has been important problem. In...
The distributed cache system contains a group of servers caching different contents based on consistent hashing. dynamic provisioning helps to improve the efficiency, which leads reduction energy cost. We first measure hit rate, request batching effect and warm-up time through experiments, considering that they can affect performance efficiency. Then we formulate stochastic network optimization problem, aims at achieving objectives queue stability, cost rate simultaneously, control server...
Low-latency data access is an important challenge for center networks. Proper placement of the items can reduce travel time in distributed storage systems, which contributes significantly to latency reduction. Most existing approaches have often assumed prior distribution requests or discovered so through trace analysis. However, traditional static model-based solutions are less effective handle system uncertainties a dynamic environment. We present DataBot, reinforcement learning-based...
Infrastructure-as-a-Service clouds in geo-distributed data centers offer various pricing options, including on-demand and reserved instances, which provide an elastic cost-effective infrastructure to support High Performance Computing (HPC) applications. In this paper, we propose instance reservation based cloud service framework, modeling the cost-minimizing decision issue as NP-hard integer programming problem for distributed centers. To ease its computation complexity, two algorithms are...
With encounter-based communication introduced in intermittently connected mobile networks (ICMNs), the message dissemination Internet subscriber/publisher services can be augmented through near-distance of nodes. Specifically, nodes with connectivity help those without to obtain messages once stored and currently carried by former. We model such a system, particularly considering time-critical property messages, limited bandwidth, existence multiple sources. Based on model, we propose...
We propose a link quality assured topology control algorithm for sensor network in this paper, which is based on the received signal strength indicator (RSSI). take uncertainty of wireless links into design consideration by adopting quasi-UDG communication model. LQATC can guarantee connectivity, symmetry, and reasonable degree nodes. Furthermore, it improves performance terms energy efficiency average interference degree. The testified comprehensive experiments. also compare with two well...
The dynamic provisioning of distributed cache services helps to improve the system efficiency. We model as groups servers caching different and none-overlapping key segments content objects, investigate benefit hit request batching. A stochastic network optimization problem is formulated, which aims at achieving stability, low energy cost certain rate simultaneously through control server activeness dispatching. transformed into a minimization each time slot online algorithm solve it...
The user-aware content retrieval services are always data-intensive and require much resource to satisfy the user demand, which incurs high cost of implementation. Considering that they could largely exploit pay-as-you-go paradigm almost unlimited pool cloud, we investigate design issues deploying cloud in a cost-effective way. We formulate allocation request handling problem aims at lowering deployment guaranteeing service quality simultaneously. Due hardness obtaining an optimal solution,...
In the paper, feature of Intermittently Connected Mobile Networks (ICMN), that information can be propagated through near-distance contact nodes, is utilized as a supplement to common Internet subscriber/publisher ser-vices. Specifically, nodes with connectivity help those without in retrieving messages once stored and carried by former. With modeling such system, especially consideration time-critical limited bandwidth, message delivery ratio delay under 1-hop 2-hop relaying modes are...
The studies in our past and ongoing work tries to make improvements data-intensive systems by extensively exploiting or considering their characteristics. Existing techniques either ignored the potential of performance improvement through an optimized design overlooked specific requirements applications, which inevitably result a sub-optimal result. Noticing that data fulfillment location is regulated but still allowed change nature distributed memory cache clusters, we proposed dynamic...