There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Praise for the Third Edition: "This is one of the best books available. Its excellent organizational structure allows quick reference to specific models and its clear presentation . . . solidifies the understanding of the concepts being presented."IIE Transactions on Operations EngineeringThoroughly revised and expanded to reflect the latest developments in the field, Fundamentals of Queueing Theory, Fourth Edition continues to present the basic statistical principles that are necessary to analyze the probabilistic nature of queues. Rather than presenting a narrow focus on the subject, this update illustrates the wide-reaching, fundamental concepts in queueing theory and its applications to diverse areas such as computer science, engineering, business, and operations research.This update takes a numerical approach to understanding and making probable estimations relating to queues, with a comprehensive outline of simple and more advanced queueing models. Newly featured topics of the Fourth Edition include:Retrial queuesApproximations for queueing networksNumerical inversion of transformsDetermining the appropriate number of servers to balance quality and cost of serviceEach chapter provides a self-contained presentation of key concepts and formulae, allowing readers to work with each section independently, while a summary table at the end of the book outlines the types of queues that have been discussed and their results. In addition, two new appendices have been added, discussing transforms and generating functions as well as the fundamentals of differential and difference equations. New examples are now included along with problems that incorporate QtsPlus software, which is freely available via the book's related Web site.With its accessible style and wealth of real-world examples, Fundamentals of Queueing Theory, Fourth Edition is an ideal book for courses on queueing theory at the upper-undergraduate and graduate levels. It is also a valuable resource for researchers and practitioners who analyze congestion in the fields of telecommunications, transportation, aviation, and management science.

Fundamentals of Queueing Theory

Matrix Factorization Techniques for Recommender Systems

Device-to-device (D2D) communications was initially proposed in cellular networks as a new paradigm for enhancing network performance. The emergence of new applications such as content distribution and location-aware advertisement introduced new user cases for D2D communications in cellular networks. The initial studies showed that D2D communications has advantages such as increased spectral efficiency and reduced communication delay. However, this communication mode introduces complications in terms of interference control overhead and protocols that are still open research problems. The feasibility of D2D communications in Long-Term Evolution Advanced is being studied by academia, industry, and standardization bodies. To date, there are more than 100 papers available on D2D communications in cellular networks, but there is no survey on this field. In this paper, we provide a taxonomy based on the D2D communicating spectrum and review the available literature extensively under the proposed taxonomy. Moreover, we provide new insights into the over-explored and under-explored areas that lead us to identify open research problems of D2D communications in cellular networks.

https://eprints.networks.imdea.org/id/document/2488

A Survey on Device-to-Device Communication in Cellular Networks

Device-to-Device (D2D) communication was initially proposed in cellular networks as a new paradigm to enhance network performance. The emergence of new applications such as content distribution and location-aware advertisement introduced new use-cases for D2D communications in cellular networks. The initial studies showed that D2D communication has advantages such as increased spectral efficiency and reduced communication delay. However, this communication mode introduces complications in terms of interference control overhead and protocols that are still open research problems. The feasibility of D2D communications in LTE-A is being studied by academia, industry, and the standardization bodies. To date, there are more than 100 papers available on D2D communications in cellular networks and, there is no survey on this field. In this article, we provide a taxonomy based on the D2D communicating spectrum and review the available literature extensively under the proposed taxonomy. Moreover, we provide new insights to the over-explored and under-explored areas which lead us to identify open research problems of D2D communication in cellular networks.

The Wireless Identification and Sensing Platform (WISP) has become a very promising experimental platform of wireless rechargeable sensor networks (WRSN), which integrates the sensing and computation capabilities to the traditional RFID tags. In such kind of networks, the simultaneous transmission may introduce severe communication collisions, which have attracted various research efforts for resolving such collisions at the MAC layer. However, different from existing works, we avoid such communication collisions through proper reader movement by exploiting the differences in the time of charge among rechargeable sensor nodes. We formulate the optimization problem and prove that complexity of the optimal solution is NP-hard, and propose a simple yet effective algorithm to optimize both the reader stop location and stop time for minimizing the total communication delay. Extensive simulation under different system settings show that our design can largely reduce the communication delay and outperform the baseline design by at least 20%.

Exploiting time of charge to achieve collision-free communications in WRSN

Actuator fault of a multicopter Unmanned Aerial Vehicle (UAV) may lead to a dangerous flight, and even damage the UAV. To ensure the flight safety in case of unpredictable actuator fault, many active fault tolerant control methods are studied in the last decade. An active fault tolerant method of a multicopter includes a fault detection, isolation and reconstruction (FDIR) scheme and a control allocation scheme. FDIR is of great importance for providing the estimation of the efficiency loss percentage. Previous FDIR procedures usually rely on an observer, which is complicated and computationally expensive. In this paper, we exploit the non-linear analytical redundancy techniques to provide a novel FDIR procedure, with a simple algorithm structure. We compare the isolation effectiveness and reconstruction performance of our approach and sliding mode observer based approach by a real experiment, respectively. It demonstrates that our approach shows a superiority of simpler algorithm structure and better fault reconstruction performance.

Actuator fault diagnosis of a Hexacopter: A nonlinear analytical redundancy approach

We consider sensor data scheduling with communication energy constraint for remote state estimation over Gilbert-Elliot channel The sensor has to decide whether to use high energy to send its local data to a remote estimator due to the limited available energy By exploiting the feedback information, we propose an effective closed-form dynamic stationary scheduling scheme Furthermore, we derive the sufficient and necessary condition for estimation stability when sensor can only use low energy at each time Examples are provided to illustrate the effectiveness of the proposed scheme

Dynamic sensor data scheduling for remote estimation over Gilbert-Elliot channel

With the rapid development of the information and communication technology in DC microgrids (DCmGs), the threat of deception attacks has been widely recognized. However, the stealthy deception attacks, which can hide the actual attack impact from the system operator as in the Stuxnet accident, have not yet been well studied. Towards this end, this paper proposes a proactive distributed detection and localization (PDDL) framework to defend against the stealthy deception attacks. The attack detection is achieved by observing the attack impact that is quantified as the voltage balancing deviation (VBD) and current sharing deviation (CSD) in DCmGs. Once any anomaly is perceived, the proactive perturbation on primary control gains (PCGs) will be activated to invalidate the previously inferred PCGs of the attacker, under which the constructed stealthy deception attacks may be located by the unknown input observer (UIO) based locators. To maximize the locatability of attacks while limiting the induced transient fluctuations on system states, an optimization problem is formulated to determine the PCG perturbation magnitude. Finally, the effectiveness of the PDDL framework is verified through extensive hardware-in-the-loop (HIL) based simulations and systematic full-hardware experimental studies.

PDDL: Proactive Distributed Detection and Localization Against Stealthy Deception Attacks in DC Microgrids

Whole flaxseed (flour) as a good source of omega-3 fatty acid and phytochemicals with excellent nutritional and functional attributes has been used to enrich foods for health promotion and disease prevention. However, several limitations and contemporary challenges still impact the development of whole flaxseed (flour)-enriched products on the global market, such as naturally occurring antinutritional factors and entrapment of nutrients within food matrix. Whole flaxseed (flour) with different existing forms could variably alter the techno-functional performance of food matrix, and ultimately affect the edible qualities of fortified food products. The potential interaction mechanism between the subject and object components in fortified products has not been elucidated yet. Hence, in this paper, the physical structure and component changes of flaxseed (flour) by pretreatments coupled with their potential influences on the edible qualities of multiple fortified food products were summarized and analyzed. In addition, several typical food products, including baked, noodle, and dairy products were preferentially selected to investigate the potential influencing mechanisms of flaxseed (flour) on different substrate components. In particular, the altered balance between water absorption of flaxseed protein/gum polysaccharides and the interruption of gluten network, lipid lubrication, lipid-amylose complexes, syneresis, and so forth, were thoroughly elucidated. The overall impact of incorporating whole flaxseed (flour) on the quality and nutritional attributes of fortified food products, coupled with the possible solutions against negative influences are aimed. This paper could provide useful information for expanding the application of whole flaxseed (flour) based on the optimal edible and nutritional properties of fortified food products.

Peng Cheng

Papers

Exploiting time of charge to achieve collision-free communications in WRSN

Actuator fault diagnosis of a Hexacopter: A nonlinear analytical redundancy approach

Dynamic sensor data scheduling for remote estimation over Gilbert-Elliot channel

PDDL: Proactive Distributed Detection and Localization Against Stealthy Deception Attacks in DC Microgrids

Composition, processing, and quality control of whole flaxseed products used to fortify foods.