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Duty-cycling schemes allow devices to dynamically adjust their active period to conserve energy. On the other hand, synchronization schemes allow multiple coordinators to schedule their transmissions in order to prevent the overlapping of superframe schedules. In this paper, we analyze the impact of a synchronization mechanism on duty-cycling schemes in an IEEE 802.15.4 cluster tree network. We show...
Industrial applications demand for ease of deployment, reliability and low-power in wireless networks, leading to standards like IEEE802.15.4, which include time synchronized channel hopping mechanisms. Yet, scheduling of transmissions on timeslots and channels falls outside the scope of current standards. Given the application requirements above, distributed (rather than centralized) scheduling has...
In the process of China's automated production, the upgrading and networking of old infrastructures becomes one of the key issues. With large quantity, numerous varieties and wide distribution, these infrastructures brings complex design work and high cost to network them into fieldbus, which greatly hamper the building of intelligent factories. This paper proposed an industrial-control solution to...
With its ability to detect, identify and, if applicable, recover from occurred faults, online-diagnosis can help achieving fault-tolerant systems. A sound decision on an occurred fault is the foundation for fault-specific recovery actions. For this, typically a large amount of data has to be analyzed and evaluated. A diagnostic process implemented on a distributed system needs to communicate all those...
In this paper, we propose a fast predictive resynchronization scheme that allows nodes to rejoin a 802.15.4e TSCH network with which they were previously synchronized. The idea of the scheme comes from the investigation of the internal and external root causes of the clock drift between two nodes--we have identified the causes and proposed a means for its estimation. Based on the prediction of the...
This paper describes and analyses a novel method to improve the parallel performance for solving sparse triangular systems (spTRSV). The main objective of this study consists in reducing the total idle time of processors as well as the execution time. Also, the developed solution is suitable for sparse and band structures. To evaluate and validate our contribution, a series of experiments have been...
Classical concurrency problems define environments for task processing with high contention of shared resources. The adaptive conflictless scheduling is an alternative to existing synchronization mechanisms used in known solutions of concurrency problem to provide parallel tasks processing without resource conflicts. Used in this paper scheduling concept eliminates deadlock between tasks that are...
Coded caching is a technique that promises huge reductions in network traffic in content-delivery networks. However, the original formulation and several subsequent contributions in the area, assume that the file requests from the users are synchronized, i.e., they arrive at the server at the same time. In this work we formulate and study the coded caching problem when the file requests from the users...
Researches affirm that coflow scheduling/routing substantially shortens the average application inner communication time in data center networks(DCNs). The commonly desirable critical features of existing coflow scheduling/routing framework includes (1) coflow scheduling, (2) coflow routing, and (3) per-flow rate-limiting. However, to provide the 3 features, existing frameworks require customized...
The basic requirement for the design of the Controller Area Network (CAN) for in-vehicle communication is to guarantee that the worst-case response time (WCRT) of each message is smaller than their specified deadline. In addition, it is desired to achieve small WCRTs that leave sufficient slack to the message deadline. In order to address the specified objectives, the idea of offset scheduling has...
Massive co-located devices require new paradigms to allow proper network connectivity. Internet of things (IoT) is the paradigm that offers a solution for the inter-connectivity of devices, but in dense IoT networks time synchronization is a critical aspect. Further, the scalability is another crucial aspect. This paper focuses on synchronization for uncoordinated dense networks without any external...
The reliability of the increasing number of modern applications and systems strongly depends on interconnecting technology. Complex systems which usually need to exchange, among other things, multimedia data together with safety-related information, as in the automotive or avionic industry, for example, make demands on both the high bandwidth and the deterministic behavior of the communication. TTEthernet...
Time synchronization is critical for parallel and distributed simulation (PADS). In this paper we first compare the two main synchronization mechanisms in PADS, namely conservative and optimistic protocols. Then we propose a Minimum Time Buckets synchronization algorithm, which can optimistically schedule events without sending anti-messages. Comparing to the well-known Breathing Time Bucket (MTB)...
In WSN organize, we have huge number of sensor hubs. The fundamental errand of a sensor hub in a sensor system is to recognize occasions, perform information preparing inside the system, and afterward transmit the information. WSN hub has restricted power source and the substitution of force source may be unimaginable. Vitality effectiveness is one of the vital issues in remote sensor systems. We...
In this report we examine efficiency criteria and requirements for the systems implemented at information-measuring systems design to research kinematics of human and his extremities movements. Characteristic aspects of these requirements are the reason to gain and develop several criteria to improve the structure, content and operation modes of the information-measuring systems.
Wireless sensor networks have prominent feature and promising future, while limited hardware resource and constrained energy pose huge challenge for protocols researcher. This paper proposes a dynamic cross-layer and energy-efficient communication protocol DCLE for wireless sensor networks. In DCLE, a synchronization scheme that features global schedule and stagger sleep is proposed to achieve sleep...
In the IEEE 802.15.4-2015 standard, Time Slotted Channel Hopping (TSCH) aims to guarantee high-level network reliability by keeping nodes time-synchronised. In order to ensure successful communication between a sender and a receiver, the latter starts listening shortly before the expected time of a MAC layer frame's arrival. The offset between the time a node starts listening and the estimated time...
The IEEE 802.15.4 standard provides a synchronization mechanism for devices connected in a star network topology using beacons. The lack of it in peer-to-peer network topology restricts its use to non-beacon mode. Addressing this issue, few protocols have been proposed based on either centralized or distributed approach. Irrespective of the approach, the three major criterion to evaluate different...
In this paper, we propose a novel joint routing and medium access control (MAC) protocol with traffic differentiation, based on quality of service (QoS) for wireless sensor networks (WSNs). This is referred to as joint routing and MAC (JRM) protocol. By leveraging the classical layered approach and combining routing and MAC layer functions, the proposed JRM protocol achieves a solution for energy...
This paper describes the design and implementation of a layered domain-specific compiler to support MADNESS—Multiresolution ADaptive Numerical Environment for Scientific Simulation. MADNESS is a high-level software environment for the solution of integral and differential equations in many dimensions, using adaptive and fast harmonic analysis methods with guaranteed precision. MADNESS uses k-d trees...
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