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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Analysis of the Asymptotic Behavior of the Local Ideality Factor
摘要： With the rapid development and application of the mobile Internet, huge amounts of user data are generated and collected every day. How to take full advantages of these ubiquitous data is becoming the essential aspect of a recommender system. Collaborative ?ltering (CF) has been widely studied and utilized to predict the interests of mobile users and to make proper recommendations. In this paper, we ?rst propose a framework of the CF recommender system based on various user data including user ratings and user behaviors. Key features of these two kinds of data are discussed. Moreover, several typical CF algorithms are classi?ed as memory-based approaches and model-based approaches and compared. Two case studies are presented in an effort to validate the proposed framework.
关键词： Mobile Internet,collaborative ?ltering,recommender system
更新于2025-09-23 15:19:57
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Visible light communication with efficient far-red/near-infrared polymer light-emitting diodes
摘要： Visible light communication (VLC) is a wireless technology that relies on optical intensity modulation and is potentially a game changer for internet-of-things (IoT) connectivity. However, VLC is hindered by the low penetration depth of visible light in non-transparent media. One solution is to extend operation into the “nearly (in)visible” near-infrared (NIR, 700–1000 nm) region, thus also enabling VLC in photonic bio-applications, considering the biological tissue NIR semitransparency, while conveniently retaining vestigial red emission to help check the link operativity by simple eye inspection. Here, we report new far-red/NIR organic light-emitting diodes (OLEDs) with a 650–800 nm emission range and external quantum efficiencies among the highest reported in this spectral range (>2.7%, with maximum radiance and luminance of 3.5 mW/cm2 and 260 cd/m2, respectively). With these OLEDs, we then demonstrate a “real-time” VLC setup achieving a data rate of 2.2 Mb/s, which satisfies the requirements for IoT and biosensing applications. These are the highest rates ever reported for an online unequalised VLC link based on solution-processed OLEDs.
关键词： Visible light communication,IoT,VLC,near-infrared,NIR,organic light-emitting diodes,internet-of-things,biosensing,OLEDs
更新于2025-09-23 15:19:57
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Secure Smart Cameras by Aggregate-Signcryption with Decryption Fairness for Multi-Receiver IoT Applications
摘要： Smart cameras are key sensors in Internet of Things (IoT) applications and often capture highly sensitive information. Therefore, security and privacy protection is a key concern. This paper introduces a lightweight security approach for smart camera IoT applications based on elliptic-curve (EC) signcryption that performs data signing and encryption in a single step. We deploy signcryption to efficiently protect sensitive data onboard the cameras and secure the data transfer from multiple cameras to multiple monitoring devices. Our multi-sender/multi-receiver approach provides integrity, authenticity, and confidentiality of data with decryption fairness for multiple receivers throughout the entire lifetime of the data. It further provides public verifiability and forward secrecy of data. Our certificateless multi-receiver aggregate-signcryption protection has been implemented for a smart camera IoT scenario, and the runtime and communication effort has been compared with single-sender/single-receiver and multi-sender/single-receiver setups.
关键词： elliptic-curve signcryption,resource efficiency,smart cameras,Internet of Things,multi-receiver aggregate-signcryption,data security
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE 9th Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON) - Vancouver, BC, Canada (2018.11.1-2018.11.3)] 2018 IEEE 9th Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON) - Solar-Powered Smart Agricultural Monitoring System Using Internet of Things Devices
摘要： Advances in wireless communication technologies for monitoring and control systems have paved the way for a new method of farming known as smart farming. Smart farming can be achieved through the use of Precision Agriculture (PA) which involves using novel technology along with inch-scale devices to monitor crops and provide precise treatments when required. Smart PA is able to take traditional farming practices and apply technological advances from areas such as Wireless Sensor Networks (WSN) and the Internet of Things (IoT) to assist in increasing the output yield of a crop while improving efficiency and reducing the amount of stress placed on a farmer. In this paper, a solar-powered smart agricultural monitoring system with IoT devices is presented. Solar-powered prototype nodes were designed to measure environmental conditions in a field and report to a base station for data storage and further processing. Two prototypes were compared in identifying the advantages gained when using energy harvesting in a device. Using an experimental testbed, a proof of concept of how the system would function is presented. According to experimental results, using an energy harvesting device can provide an increased lifetime for a device by supplying power and recharging its battery.
关键词： Internet of Things,Precision Agriculture,Smart Monitoring,Wireless Sensor Network
更新于2025-09-19 17:15:36
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User Preference Aware Task Coordination and Proactive Bandwidth Allocation in a FiWi Based Human-Agent-Robot Teamwork Ecosystem
摘要： Cooperative human-agent-robot teamwork (HART) provides enormous opportunities for present-day human users to orchestrate their real-time tasks in a coordinated fashion. However, given human users’ different preferences for real-time HART task execution, e.g., lower delay and monetary cost, the selection of proper task coordination services has emerged as an important research problem by taking dynamically changing cloud agent/robot resources, network bandwidth utilization as well as delay-sensitive and delay-tolerant HART task properties into account. To cope with these challenges, in this paper we explore the synergy between caching, computation, and communications for achieving cost-effective HART task execution. To exploit the locality of different HART-centric tasks and local/non-local cloud agent/robot resources for different HART-centric task execution, we consider integrated fiber-wireless (FiWi) enhanced networks with computation task offloading as well as fiber backhaul sharing and WiFi offloading capabilities. More precisely, to minimize task execution delay and monetary cost, we propose a user preference aware HART task coordination framework that selects the appropriate dedicated or non-dedicated robot and cloud agent for given caching and computing HART task execution requirements. Further, to cope with varying bandwidth resources, we propose a proactive bandwidth allocation policy for the execution of both delay-sensitive and delay-tolerant HART tasks execution across FiWi enhanced network infrastructures. We evaluate the performance of our proposed preference aware task offloading scheme and compare it to various baseline schemes in terms of different key performance indicators, including the task execution time and monetary cost saving ratio, communication to computation ratio, and offloading gain overhead ratio. Our findings indicate that the proposed delay cost saving (DCS) policy exhibits a 27% higher task execution time saving ratio and a 48% lower monetary cost saving ratio than the proposed monetary cost saving (MCS) policy in a typical scenario.
关键词： human-agent-robot teamwork (HART),Tactile Internet,fiber-wireless (FiWi) enhanced networks,Caching,computation offloading
更新于2025-09-19 17:15:36
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Nanostructured Core Optical Fibres for Laser Applications
摘要： Wireless sensor networks (WSNs) are a prominent fundamental technology of the Internet of Things (IoTs). Rather than device-to-device communications, group communications in the form of broadcasting and multicasting incur efficient message deliveries among resource-constrained sensor nodes in the IoT-enabled WSNs. Secure and efficient key management is in many cases used to protect the authenticity, integrity, and confidentiality of multicast messages. This paper develops two group key establishment protocols for secure multicast communications among the resource-constrained devices in IoT. Major deployment conditions and requirements of each protocol are described in terms of the specific IoT application scenarios. Furthermore, the applicability of the two protocols is analyzed and justified by a comprehensive analysis of the performance, scalability, and security of the protocols proposed.
关键词： wireless sensor networks,group key establishment,multicast,Internet of Things,security
更新于2025-09-19 17:13:59
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13.7-W 588-nm yellow laser generation by frequency doubling of 885-nm side-pumped Nd:YAG-YVO4 intracavity Raman laser
摘要： To avoid resources on green earth being exhausted much earlier by human beings, energy saving has been one of the key issues in our everyday lives. In fact, energy control for some appliances is an effective method to save energy at home, since it prevents users from consuming too much energy. Even though there are numerous commercial energy-effective products that are helpful in energy saving for particular appliances, it is still hard to find a comprehensive solution to effectively reduce appliances’ energy consumption in a house. Therefore, in this paper, an intelligent energy control scheme, named the residence energy control system (RECoS) is proposed, which is developed based on wireless smart socket and Internet of Things technology to minimize energy consumption of home appliances without deploying sensors. The RECoS provides four control modes, including peak-time control, energy-limit control, automatic control, and user control. The former two are operated for all smart sockets in a house, while the latter two are used by individual smart sockets, aiming to enhance the functionality of energy control. The experimental results show that the proposed scheme can save up to 43.4% of energy for some appliances in one weekday.
关键词： smart living,neural network,Energy control system,smart socket,Internet of Things (IoT)
更新于2025-09-19 17:13:59
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Photonics-Based Real-Time 2D (Time-Frequency) Broadband Signal Analysis and Processing
摘要： Wireless standardization activities, such as the Bluetooth V4.x (Bluetooth smart), have led to an explosive growth in innovative short-range wireless devices capable of providing various services to assist everyday life. Allowing machine-to-machine (M2M) communication between these M2M devices also presents new commercial service opportunities. M2M service providers, including telecom carriers, may need to establish new networks to accommodate M2M interactions while identifying new business opportunities. Typically, M2M devices need another capable device, such as a smartphone, to act as a gateway to connect to the Internet to operate at their full potential. We propose a novel scheme in which any Internet-enabled device in the vicinity can act as an M2M gateway for M2M devices. This eliminates the need for the M2M device user to also own a smartphone or an Internet-enabled device to obtain services such as online-to-offline. This scheme faces new challenges, such as how to identify the best M2M gateway for a required service and the QoS. This paper proposes a method to select an M2M gateway from a large number of possibilities in order to increase service availability while also obtaining better signal strength for higher QoS. The methods presented are evaluated in terms of their performance, including energy consumption, and a service deployment guideline is derived using real-world data collected at an exhibition, which gave encouraging results.
关键词： M2M service architecture,energy consumption,Internet of Things,M2M communication,Bluetooth smart device,M2M gateway selection
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Improving the accuracy of the laser control system
摘要： With the applications heterogeneous of Internet of Things (IoT) technology, the heterogeneous IoT systems generate a large number of heterogeneous datas, including videos and images. How to efficiently represent these images is an important and challenging task. As a local descriptor, the texton analysis has attracted wide attentions in the field of image processing. A variety of texton-based methods have been proposed in the past few years, which have achieved excellent performance. But, there still exists some problems to be solved, especially, it is difficult to describe the images with complex scenes from IoT. To address this problem, this paper proposes a multi-feature representation method called diagonal structure descriptor. It is more suitable for intermediate feature extraction and conducive to multi-feature fusion. Based on visual attention mechanism, five kinds of diagonal structure textons are defined by the color differences of diagonal pixels. Then, four types of visual features are extracted from the mapping sub-graphs and integrated into 1-D vector. Various experiments on three Corel-datasets demonstrate that the proposed method performs better than several state-of-the-art methods.
关键词： feature extraction,local descriptor,image representation,image retrieval,Internet of Things
更新于2025-09-19 17:13:59
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[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - High detectivity AlInSb mid-infrared photodiode sensors with dislocation filter layers for gas sensing application
摘要： An Enhanced-Internet that provides ultra-low-latency guaranteed-rate communications for Cloud Services is proposed. The network supports two traffic classes, the Smooth and Best-Effort classes. Smooth traffic flows receive low-jitter GR service over virtual-circuit-switched (VCS) connections with negligible buffering and queueing delays, up to 100% link utilizations, deterministic end-to-end quality-of-service (QoS) guarantees, and improved energy efficiency. End-to-end delays are effectively reduced to the fiber “time of flight.” A new router scheduling problem called the Bounded Normalized-Jitter integer-programming problem is formulated. A fast polynomial-time approximate solution is presented, allowing TDM-based router schedules to be computed in microseconds. We establish that all admissible traffic demands in any packet-switched network can be simultaneously satisfied with GR-VCS connections, with minimal buffering. Each router can use two periodic TDM-based schedules to support GR-VCS connections, which are updated automatically when the router's traffic rate matrix changes. The design of a Silicon-Photonics all-optical packet switch with minimal buffering is presented. The Enhanced-Internet can: 1) reduce router buffer requirements by factors of ; 2) increase the Internet's aggregate capacity; 3) lower the Internet's capital and operating costs; and 4) lower greenhouse gas emissions through improved energy efficiency.
关键词： energy efficiency,DiffServ,cloud,low latency,Buffer sizes,routing,data centers,Future Internet,cloud computing,quality of service (QoS),scheduling
更新于2025-09-19 17:13:59